2 * linux/drivers/char/synclink.c
4 * $Id: synclink.c,v 4.38 2005/11/07 16:30:34 paulkf Exp $
6 * Device driver for Microgate SyncLink ISA and PCI
7 * high speed multiprotocol serial adapters.
9 * written by Paul Fulghum for Microgate Corporation
10 * paulkf@microgate.com
12 * Microgate and SyncLink are trademarks of Microgate Corporation
14 * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
16 * Original release 01/11/99
18 * This code is released under the GNU General Public License (GPL)
20 * This driver is primarily intended for use in synchronous
21 * HDLC mode. Asynchronous mode is also provided.
23 * When operating in synchronous mode, each call to mgsl_write()
24 * contains exactly one complete HDLC frame. Calling mgsl_put_char
25 * will start assembling an HDLC frame that will not be sent until
26 * mgsl_flush_chars or mgsl_write is called.
28 * Synchronous receive data is reported as complete frames. To accomplish
29 * this, the TTY flip buffer is bypassed (too small to hold largest
30 * frame and may fragment frames) and the line discipline
31 * receive entry point is called directly.
33 * This driver has been tested with a slightly modified ppp.c driver
34 * for synchronous PPP.
37 * Added interface for syncppp.c driver (an alternate synchronous PPP
38 * implementation that also supports Cisco HDLC). Each device instance
39 * registers as a tty device AND a network device (if dosyncppp option
40 * is set for the device). The functionality is determined by which
41 * device interface is opened.
43 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
44 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
45 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
46 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
47 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
48 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
49 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
51 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
52 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
53 * OF THE POSSIBILITY OF SUCH DAMAGE.
57 # define BREAKPOINT() asm(" int $3");
59 # define BREAKPOINT() { }
62 #define MAX_ISA_DEVICES 10
63 #define MAX_PCI_DEVICES 10
64 #define MAX_TOTAL_DEVICES 20
66 #include <linux/module.h>
67 #include <linux/errno.h>
68 #include <linux/signal.h>
69 #include <linux/sched.h>
70 #include <linux/timer.h>
71 #include <linux/interrupt.h>
72 #include <linux/pci.h>
73 #include <linux/tty.h>
74 #include <linux/tty_flip.h>
75 #include <linux/serial.h>
76 #include <linux/major.h>
77 #include <linux/string.h>
78 #include <linux/fcntl.h>
79 #include <linux/ptrace.h>
80 #include <linux/ioport.h>
82 #include <linux/slab.h>
83 #include <linux/delay.h>
84 #include <linux/netdevice.h>
85 #include <linux/vmalloc.h>
86 #include <linux/init.h>
87 #include <linux/ioctl.h>
88 #include <linux/synclink.h>
90 #include <asm/system.h>
94 #include <linux/bitops.h>
95 #include <asm/types.h>
96 #include <linux/termios.h>
97 #include <linux/workqueue.h>
98 #include <linux/hdlc.h>
99 #include <linux/dma-mapping.h>
101 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_MODULE))
102 #define SYNCLINK_GENERIC_HDLC 1
104 #define SYNCLINK_GENERIC_HDLC 0
107 #define GET_USER(error,value,addr) error = get_user(value,addr)
108 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
109 #define PUT_USER(error,value,addr) error = put_user(value,addr)
110 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
112 #include <asm/uaccess.h>
114 #define RCLRVALUE 0xffff
116 static MGSL_PARAMS default_params = {
117 MGSL_MODE_HDLC, /* unsigned long mode */
118 0, /* unsigned char loopback; */
119 HDLC_FLAG_UNDERRUN_ABORT15, /* unsigned short flags; */
120 HDLC_ENCODING_NRZI_SPACE, /* unsigned char encoding; */
121 0, /* unsigned long clock_speed; */
122 0xff, /* unsigned char addr_filter; */
123 HDLC_CRC_16_CCITT, /* unsigned short crc_type; */
124 HDLC_PREAMBLE_LENGTH_8BITS, /* unsigned char preamble_length; */
125 HDLC_PREAMBLE_PATTERN_NONE, /* unsigned char preamble; */
126 9600, /* unsigned long data_rate; */
127 8, /* unsigned char data_bits; */
128 1, /* unsigned char stop_bits; */
129 ASYNC_PARITY_NONE /* unsigned char parity; */
132 #define SHARED_MEM_ADDRESS_SIZE 0x40000
133 #define BUFFERLISTSIZE 4096
134 #define DMABUFFERSIZE 4096
135 #define MAXRXFRAMES 7
137 typedef struct _DMABUFFERENTRY
139 u32 phys_addr; /* 32-bit flat physical address of data buffer */
140 volatile u16 count; /* buffer size/data count */
141 volatile u16 status; /* Control/status field */
142 volatile u16 rcc; /* character count field */
143 u16 reserved; /* padding required by 16C32 */
144 u32 link; /* 32-bit flat link to next buffer entry */
145 char *virt_addr; /* virtual address of data buffer */
146 u32 phys_entry; /* physical address of this buffer entry */
148 } DMABUFFERENTRY, *DMAPBUFFERENTRY;
150 /* The queue of BH actions to be performed */
153 #define BH_TRANSMIT 2
156 #define IO_PIN_SHUTDOWN_LIMIT 100
158 struct _input_signal_events {
169 /* transmit holding buffer definitions*/
170 #define MAX_TX_HOLDING_BUFFERS 5
171 struct tx_holding_buffer {
173 unsigned char * buffer;
178 * Device instance data structure
183 struct tty_port port;
186 unsigned short close_delay;
187 unsigned short closing_wait; /* time to wait before closing */
189 struct mgsl_icount icount;
192 int x_char; /* xon/xoff character */
193 u16 read_status_mask;
194 u16 ignore_status_mask;
195 unsigned char *xmit_buf;
200 wait_queue_head_t status_event_wait_q;
201 wait_queue_head_t event_wait_q;
202 struct timer_list tx_timer; /* HDLC transmit timeout timer */
203 struct mgsl_struct *next_device; /* device list link */
205 spinlock_t irq_spinlock; /* spinlock for synchronizing with ISR */
206 struct work_struct task; /* task structure for scheduling bh */
208 u32 EventMask; /* event trigger mask */
209 u32 RecordedEvents; /* pending events */
211 u32 max_frame_size; /* as set by device config */
215 bool bh_running; /* Protection from multiple */
219 int dcd_chkcount; /* check counts to prevent */
220 int cts_chkcount; /* too many IRQs if a signal */
221 int dsr_chkcount; /* is floating */
224 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
225 u32 buffer_list_phys;
226 dma_addr_t buffer_list_dma_addr;
228 unsigned int rx_buffer_count; /* count of total allocated Rx buffers */
229 DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
230 unsigned int current_rx_buffer;
232 int num_tx_dma_buffers; /* number of tx dma frames required */
233 int tx_dma_buffers_used;
234 unsigned int tx_buffer_count; /* count of total allocated Tx buffers */
235 DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
236 int start_tx_dma_buffer; /* tx dma buffer to start tx dma operation */
237 int current_tx_buffer; /* next tx dma buffer to be loaded */
239 unsigned char *intermediate_rxbuffer;
241 int num_tx_holding_buffers; /* number of tx holding buffer allocated */
242 int get_tx_holding_index; /* next tx holding buffer for adapter to load */
243 int put_tx_holding_index; /* next tx holding buffer to store user request */
244 int tx_holding_count; /* number of tx holding buffers waiting */
245 struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
249 bool rx_rcc_underrun;
258 char device_name[25]; /* device instance name */
260 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
261 unsigned char bus; /* expansion bus number (zero based) */
262 unsigned char function; /* PCI device number */
264 unsigned int io_base; /* base I/O address of adapter */
265 unsigned int io_addr_size; /* size of the I/O address range */
266 bool io_addr_requested; /* true if I/O address requested */
268 unsigned int irq_level; /* interrupt level */
269 unsigned long irq_flags;
270 bool irq_requested; /* true if IRQ requested */
272 unsigned int dma_level; /* DMA channel */
273 bool dma_requested; /* true if dma channel requested */
279 MGSL_PARAMS params; /* communications parameters */
281 unsigned char serial_signals; /* current serial signal states */
283 bool irq_occurred; /* for diagnostics use */
284 unsigned int init_error; /* Initialization startup error (DIAGS) */
285 int fDiagnosticsmode; /* Driver in Diagnostic mode? (DIAGS) */
288 unsigned char* memory_base; /* shared memory address (PCI only) */
289 u32 phys_memory_base;
290 bool shared_mem_requested;
292 unsigned char* lcr_base; /* local config registers (PCI only) */
295 bool lcr_mem_requested;
298 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
299 char char_buf[MAX_ASYNC_BUFFER_SIZE];
300 bool drop_rts_on_tx_done;
302 bool loopmode_insert_requested;
303 bool loopmode_send_done_requested;
305 struct _input_signal_events input_signal_events;
307 /* generic HDLC device parts */
312 #if SYNCLINK_GENERIC_HDLC
313 struct net_device *netdev;
317 #define MGSL_MAGIC 0x5401
320 * The size of the serial xmit buffer is 1 page, or 4096 bytes
322 #ifndef SERIAL_XMIT_SIZE
323 #define SERIAL_XMIT_SIZE 4096
327 * These macros define the offsets used in calculating the
328 * I/O address of the specified USC registers.
332 #define DCPIN 2 /* Bit 1 of I/O address */
333 #define SDPIN 4 /* Bit 2 of I/O address */
335 #define DCAR 0 /* DMA command/address register */
336 #define CCAR SDPIN /* channel command/address register */
337 #define DATAREG DCPIN + SDPIN /* serial data register */
342 * These macros define the register address (ordinal number)
343 * used for writing address/value pairs to the USC.
346 #define CMR 0x02 /* Channel mode Register */
347 #define CCSR 0x04 /* Channel Command/status Register */
348 #define CCR 0x06 /* Channel Control Register */
349 #define PSR 0x08 /* Port status Register */
350 #define PCR 0x0a /* Port Control Register */
351 #define TMDR 0x0c /* Test mode Data Register */
352 #define TMCR 0x0e /* Test mode Control Register */
353 #define CMCR 0x10 /* Clock mode Control Register */
354 #define HCR 0x12 /* Hardware Configuration Register */
355 #define IVR 0x14 /* Interrupt Vector Register */
356 #define IOCR 0x16 /* Input/Output Control Register */
357 #define ICR 0x18 /* Interrupt Control Register */
358 #define DCCR 0x1a /* Daisy Chain Control Register */
359 #define MISR 0x1c /* Misc Interrupt status Register */
360 #define SICR 0x1e /* status Interrupt Control Register */
361 #define RDR 0x20 /* Receive Data Register */
362 #define RMR 0x22 /* Receive mode Register */
363 #define RCSR 0x24 /* Receive Command/status Register */
364 #define RICR 0x26 /* Receive Interrupt Control Register */
365 #define RSR 0x28 /* Receive Sync Register */
366 #define RCLR 0x2a /* Receive count Limit Register */
367 #define RCCR 0x2c /* Receive Character count Register */
368 #define TC0R 0x2e /* Time Constant 0 Register */
369 #define TDR 0x30 /* Transmit Data Register */
370 #define TMR 0x32 /* Transmit mode Register */
371 #define TCSR 0x34 /* Transmit Command/status Register */
372 #define TICR 0x36 /* Transmit Interrupt Control Register */
373 #define TSR 0x38 /* Transmit Sync Register */
374 #define TCLR 0x3a /* Transmit count Limit Register */
375 #define TCCR 0x3c /* Transmit Character count Register */
376 #define TC1R 0x3e /* Time Constant 1 Register */
380 * MACRO DEFINITIONS FOR DMA REGISTERS
383 #define DCR 0x06 /* DMA Control Register (shared) */
384 #define DACR 0x08 /* DMA Array count Register (shared) */
385 #define BDCR 0x12 /* Burst/Dwell Control Register (shared) */
386 #define DIVR 0x14 /* DMA Interrupt Vector Register (shared) */
387 #define DICR 0x18 /* DMA Interrupt Control Register (shared) */
388 #define CDIR 0x1a /* Clear DMA Interrupt Register (shared) */
389 #define SDIR 0x1c /* Set DMA Interrupt Register (shared) */
391 #define TDMR 0x02 /* Transmit DMA mode Register */
392 #define TDIAR 0x1e /* Transmit DMA Interrupt Arm Register */
393 #define TBCR 0x2a /* Transmit Byte count Register */
394 #define TARL 0x2c /* Transmit Address Register (low) */
395 #define TARU 0x2e /* Transmit Address Register (high) */
396 #define NTBCR 0x3a /* Next Transmit Byte count Register */
397 #define NTARL 0x3c /* Next Transmit Address Register (low) */
398 #define NTARU 0x3e /* Next Transmit Address Register (high) */
400 #define RDMR 0x82 /* Receive DMA mode Register (non-shared) */
401 #define RDIAR 0x9e /* Receive DMA Interrupt Arm Register */
402 #define RBCR 0xaa /* Receive Byte count Register */
403 #define RARL 0xac /* Receive Address Register (low) */
404 #define RARU 0xae /* Receive Address Register (high) */
405 #define NRBCR 0xba /* Next Receive Byte count Register */
406 #define NRARL 0xbc /* Next Receive Address Register (low) */
407 #define NRARU 0xbe /* Next Receive Address Register (high) */
411 * MACRO DEFINITIONS FOR MODEM STATUS BITS
414 #define MODEMSTATUS_DTR 0x80
415 #define MODEMSTATUS_DSR 0x40
416 #define MODEMSTATUS_RTS 0x20
417 #define MODEMSTATUS_CTS 0x10
418 #define MODEMSTATUS_RI 0x04
419 #define MODEMSTATUS_DCD 0x01
423 * Channel Command/Address Register (CCAR) Command Codes
426 #define RTCmd_Null 0x0000
427 #define RTCmd_ResetHighestIus 0x1000
428 #define RTCmd_TriggerChannelLoadDma 0x2000
429 #define RTCmd_TriggerRxDma 0x2800
430 #define RTCmd_TriggerTxDma 0x3000
431 #define RTCmd_TriggerRxAndTxDma 0x3800
432 #define RTCmd_PurgeRxFifo 0x4800
433 #define RTCmd_PurgeTxFifo 0x5000
434 #define RTCmd_PurgeRxAndTxFifo 0x5800
435 #define RTCmd_LoadRcc 0x6800
436 #define RTCmd_LoadTcc 0x7000
437 #define RTCmd_LoadRccAndTcc 0x7800
438 #define RTCmd_LoadTC0 0x8800
439 #define RTCmd_LoadTC1 0x9000
440 #define RTCmd_LoadTC0AndTC1 0x9800
441 #define RTCmd_SerialDataLSBFirst 0xa000
442 #define RTCmd_SerialDataMSBFirst 0xa800
443 #define RTCmd_SelectBigEndian 0xb000
444 #define RTCmd_SelectLittleEndian 0xb800
448 * DMA Command/Address Register (DCAR) Command Codes
451 #define DmaCmd_Null 0x0000
452 #define DmaCmd_ResetTxChannel 0x1000
453 #define DmaCmd_ResetRxChannel 0x1200
454 #define DmaCmd_StartTxChannel 0x2000
455 #define DmaCmd_StartRxChannel 0x2200
456 #define DmaCmd_ContinueTxChannel 0x3000
457 #define DmaCmd_ContinueRxChannel 0x3200
458 #define DmaCmd_PauseTxChannel 0x4000
459 #define DmaCmd_PauseRxChannel 0x4200
460 #define DmaCmd_AbortTxChannel 0x5000
461 #define DmaCmd_AbortRxChannel 0x5200
462 #define DmaCmd_InitTxChannel 0x7000
463 #define DmaCmd_InitRxChannel 0x7200
464 #define DmaCmd_ResetHighestDmaIus 0x8000
465 #define DmaCmd_ResetAllChannels 0x9000
466 #define DmaCmd_StartAllChannels 0xa000
467 #define DmaCmd_ContinueAllChannels 0xb000
468 #define DmaCmd_PauseAllChannels 0xc000
469 #define DmaCmd_AbortAllChannels 0xd000
470 #define DmaCmd_InitAllChannels 0xf000
472 #define TCmd_Null 0x0000
473 #define TCmd_ClearTxCRC 0x2000
474 #define TCmd_SelectTicrTtsaData 0x4000
475 #define TCmd_SelectTicrTxFifostatus 0x5000
476 #define TCmd_SelectTicrIntLevel 0x6000
477 #define TCmd_SelectTicrdma_level 0x7000
478 #define TCmd_SendFrame 0x8000
479 #define TCmd_SendAbort 0x9000
480 #define TCmd_EnableDleInsertion 0xc000
481 #define TCmd_DisableDleInsertion 0xd000
482 #define TCmd_ClearEofEom 0xe000
483 #define TCmd_SetEofEom 0xf000
485 #define RCmd_Null 0x0000
486 #define RCmd_ClearRxCRC 0x2000
487 #define RCmd_EnterHuntmode 0x3000
488 #define RCmd_SelectRicrRtsaData 0x4000
489 #define RCmd_SelectRicrRxFifostatus 0x5000
490 #define RCmd_SelectRicrIntLevel 0x6000
491 #define RCmd_SelectRicrdma_level 0x7000
494 * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
497 #define RECEIVE_STATUS BIT5
498 #define RECEIVE_DATA BIT4
499 #define TRANSMIT_STATUS BIT3
500 #define TRANSMIT_DATA BIT2
506 * Receive status Bits in Receive Command/status Register RCSR
509 #define RXSTATUS_SHORT_FRAME BIT8
510 #define RXSTATUS_CODE_VIOLATION BIT8
511 #define RXSTATUS_EXITED_HUNT BIT7
512 #define RXSTATUS_IDLE_RECEIVED BIT6
513 #define RXSTATUS_BREAK_RECEIVED BIT5
514 #define RXSTATUS_ABORT_RECEIVED BIT5
515 #define RXSTATUS_RXBOUND BIT4
516 #define RXSTATUS_CRC_ERROR BIT3
517 #define RXSTATUS_FRAMING_ERROR BIT3
518 #define RXSTATUS_ABORT BIT2
519 #define RXSTATUS_PARITY_ERROR BIT2
520 #define RXSTATUS_OVERRUN BIT1
521 #define RXSTATUS_DATA_AVAILABLE BIT0
522 #define RXSTATUS_ALL 0x01f6
523 #define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
526 * Values for setting transmit idle mode in
527 * Transmit Control/status Register (TCSR)
529 #define IDLEMODE_FLAGS 0x0000
530 #define IDLEMODE_ALT_ONE_ZERO 0x0100
531 #define IDLEMODE_ZERO 0x0200
532 #define IDLEMODE_ONE 0x0300
533 #define IDLEMODE_ALT_MARK_SPACE 0x0500
534 #define IDLEMODE_SPACE 0x0600
535 #define IDLEMODE_MARK 0x0700
536 #define IDLEMODE_MASK 0x0700
539 * IUSC revision identifiers
541 #define IUSC_SL1660 0x4d44
542 #define IUSC_PRE_SL1660 0x4553
545 * Transmit status Bits in Transmit Command/status Register (TCSR)
548 #define TCSR_PRESERVE 0x0F00
550 #define TCSR_UNDERWAIT BIT11
551 #define TXSTATUS_PREAMBLE_SENT BIT7
552 #define TXSTATUS_IDLE_SENT BIT6
553 #define TXSTATUS_ABORT_SENT BIT5
554 #define TXSTATUS_EOF_SENT BIT4
555 #define TXSTATUS_EOM_SENT BIT4
556 #define TXSTATUS_CRC_SENT BIT3
557 #define TXSTATUS_ALL_SENT BIT2
558 #define TXSTATUS_UNDERRUN BIT1
559 #define TXSTATUS_FIFO_EMPTY BIT0
560 #define TXSTATUS_ALL 0x00fa
561 #define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
564 #define MISCSTATUS_RXC_LATCHED BIT15
565 #define MISCSTATUS_RXC BIT14
566 #define MISCSTATUS_TXC_LATCHED BIT13
567 #define MISCSTATUS_TXC BIT12
568 #define MISCSTATUS_RI_LATCHED BIT11
569 #define MISCSTATUS_RI BIT10
570 #define MISCSTATUS_DSR_LATCHED BIT9
571 #define MISCSTATUS_DSR BIT8
572 #define MISCSTATUS_DCD_LATCHED BIT7
573 #define MISCSTATUS_DCD BIT6
574 #define MISCSTATUS_CTS_LATCHED BIT5
575 #define MISCSTATUS_CTS BIT4
576 #define MISCSTATUS_RCC_UNDERRUN BIT3
577 #define MISCSTATUS_DPLL_NO_SYNC BIT2
578 #define MISCSTATUS_BRG1_ZERO BIT1
579 #define MISCSTATUS_BRG0_ZERO BIT0
581 #define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
582 #define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
584 #define SICR_RXC_ACTIVE BIT15
585 #define SICR_RXC_INACTIVE BIT14
586 #define SICR_RXC (BIT15+BIT14)
587 #define SICR_TXC_ACTIVE BIT13
588 #define SICR_TXC_INACTIVE BIT12
589 #define SICR_TXC (BIT13+BIT12)
590 #define SICR_RI_ACTIVE BIT11
591 #define SICR_RI_INACTIVE BIT10
592 #define SICR_RI (BIT11+BIT10)
593 #define SICR_DSR_ACTIVE BIT9
594 #define SICR_DSR_INACTIVE BIT8
595 #define SICR_DSR (BIT9+BIT8)
596 #define SICR_DCD_ACTIVE BIT7
597 #define SICR_DCD_INACTIVE BIT6
598 #define SICR_DCD (BIT7+BIT6)
599 #define SICR_CTS_ACTIVE BIT5
600 #define SICR_CTS_INACTIVE BIT4
601 #define SICR_CTS (BIT5+BIT4)
602 #define SICR_RCC_UNDERFLOW BIT3
603 #define SICR_DPLL_NO_SYNC BIT2
604 #define SICR_BRG1_ZERO BIT1
605 #define SICR_BRG0_ZERO BIT0
607 void usc_DisableMasterIrqBit( struct mgsl_struct *info );
608 void usc_EnableMasterIrqBit( struct mgsl_struct *info );
609 void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
610 void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
611 void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
613 #define usc_EnableInterrupts( a, b ) \
614 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
616 #define usc_DisableInterrupts( a, b ) \
617 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
619 #define usc_EnableMasterIrqBit(a) \
620 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
622 #define usc_DisableMasterIrqBit(a) \
623 usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
625 #define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
628 * Transmit status Bits in Transmit Control status Register (TCSR)
629 * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
632 #define TXSTATUS_PREAMBLE_SENT BIT7
633 #define TXSTATUS_IDLE_SENT BIT6
634 #define TXSTATUS_ABORT_SENT BIT5
635 #define TXSTATUS_EOF BIT4
636 #define TXSTATUS_CRC_SENT BIT3
637 #define TXSTATUS_ALL_SENT BIT2
638 #define TXSTATUS_UNDERRUN BIT1
639 #define TXSTATUS_FIFO_EMPTY BIT0
641 #define DICR_MASTER BIT15
642 #define DICR_TRANSMIT BIT0
643 #define DICR_RECEIVE BIT1
645 #define usc_EnableDmaInterrupts(a,b) \
646 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
648 #define usc_DisableDmaInterrupts(a,b) \
649 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
651 #define usc_EnableStatusIrqs(a,b) \
652 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
654 #define usc_DisablestatusIrqs(a,b) \
655 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
657 /* Transmit status Bits in Transmit Control status Register (TCSR) */
658 /* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
661 #define DISABLE_UNCONDITIONAL 0
662 #define DISABLE_END_OF_FRAME 1
663 #define ENABLE_UNCONDITIONAL 2
664 #define ENABLE_AUTO_CTS 3
665 #define ENABLE_AUTO_DCD 3
666 #define usc_EnableTransmitter(a,b) \
667 usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
668 #define usc_EnableReceiver(a,b) \
669 usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
671 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 Port );
672 static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
673 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
675 static u16 usc_InReg( struct mgsl_struct *info, u16 Port );
676 static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
677 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
678 void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
679 void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
681 #define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
682 #define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
684 #define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
686 static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
687 static void usc_start_receiver( struct mgsl_struct *info );
688 static void usc_stop_receiver( struct mgsl_struct *info );
690 static void usc_start_transmitter( struct mgsl_struct *info );
691 static void usc_stop_transmitter( struct mgsl_struct *info );
692 static void usc_set_txidle( struct mgsl_struct *info );
693 static void usc_load_txfifo( struct mgsl_struct *info );
695 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
696 static void usc_enable_loopback( struct mgsl_struct *info, int enable );
698 static void usc_get_serial_signals( struct mgsl_struct *info );
699 static void usc_set_serial_signals( struct mgsl_struct *info );
701 static void usc_reset( struct mgsl_struct *info );
703 static void usc_set_sync_mode( struct mgsl_struct *info );
704 static void usc_set_sdlc_mode( struct mgsl_struct *info );
705 static void usc_set_async_mode( struct mgsl_struct *info );
706 static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
708 static void usc_loopback_frame( struct mgsl_struct *info );
710 static void mgsl_tx_timeout(unsigned long context);
713 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
714 static void usc_loopmode_insert_request( struct mgsl_struct * info );
715 static int usc_loopmode_active( struct mgsl_struct * info);
716 static void usc_loopmode_send_done( struct mgsl_struct * info );
718 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
720 #if SYNCLINK_GENERIC_HDLC
721 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
722 static void hdlcdev_tx_done(struct mgsl_struct *info);
723 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
724 static int hdlcdev_init(struct mgsl_struct *info);
725 static void hdlcdev_exit(struct mgsl_struct *info);
729 * Defines a BUS descriptor value for the PCI adapter
730 * local bus address ranges.
733 #define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
744 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
747 * Adapter diagnostic routines
749 static bool mgsl_register_test( struct mgsl_struct *info );
750 static bool mgsl_irq_test( struct mgsl_struct *info );
751 static bool mgsl_dma_test( struct mgsl_struct *info );
752 static bool mgsl_memory_test( struct mgsl_struct *info );
753 static int mgsl_adapter_test( struct mgsl_struct *info );
756 * device and resource management routines
758 static int mgsl_claim_resources(struct mgsl_struct *info);
759 static void mgsl_release_resources(struct mgsl_struct *info);
760 static void mgsl_add_device(struct mgsl_struct *info);
761 static struct mgsl_struct* mgsl_allocate_device(void);
764 * DMA buffer manupulation functions.
766 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
767 static bool mgsl_get_rx_frame( struct mgsl_struct *info );
768 static bool mgsl_get_raw_rx_frame( struct mgsl_struct *info );
769 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
770 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
771 static int num_free_tx_dma_buffers(struct mgsl_struct *info);
772 static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
773 static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
776 * DMA and Shared Memory buffer allocation and formatting
778 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info);
779 static void mgsl_free_dma_buffers(struct mgsl_struct *info);
780 static int mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
781 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
782 static int mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
783 static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
784 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
785 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
786 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
787 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
788 static bool load_next_tx_holding_buffer(struct mgsl_struct *info);
789 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
792 * Bottom half interrupt handlers
794 static void mgsl_bh_handler(struct work_struct *work);
795 static void mgsl_bh_receive(struct mgsl_struct *info);
796 static void mgsl_bh_transmit(struct mgsl_struct *info);
797 static void mgsl_bh_status(struct mgsl_struct *info);
800 * Interrupt handler routines and dispatch table.
802 static void mgsl_isr_null( struct mgsl_struct *info );
803 static void mgsl_isr_transmit_data( struct mgsl_struct *info );
804 static void mgsl_isr_receive_data( struct mgsl_struct *info );
805 static void mgsl_isr_receive_status( struct mgsl_struct *info );
806 static void mgsl_isr_transmit_status( struct mgsl_struct *info );
807 static void mgsl_isr_io_pin( struct mgsl_struct *info );
808 static void mgsl_isr_misc( struct mgsl_struct *info );
809 static void mgsl_isr_receive_dma( struct mgsl_struct *info );
810 static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
812 typedef void (*isr_dispatch_func)(struct mgsl_struct *);
814 static isr_dispatch_func UscIsrTable[7] =
819 mgsl_isr_transmit_data,
820 mgsl_isr_transmit_status,
821 mgsl_isr_receive_data,
822 mgsl_isr_receive_status
826 * ioctl call handlers
828 static int tiocmget(struct tty_struct *tty, struct file *file);
829 static int tiocmset(struct tty_struct *tty, struct file *file,
830 unsigned int set, unsigned int clear);
831 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
832 __user *user_icount);
833 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params);
834 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params);
835 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
836 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
837 static int mgsl_txenable(struct mgsl_struct * info, int enable);
838 static int mgsl_txabort(struct mgsl_struct * info);
839 static int mgsl_rxenable(struct mgsl_struct * info, int enable);
840 static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
841 static int mgsl_loopmode_send_done( struct mgsl_struct * info );
843 /* set non-zero on successful registration with PCI subsystem */
844 static bool pci_registered;
847 * Global linked list of SyncLink devices
849 static struct mgsl_struct *mgsl_device_list;
850 static int mgsl_device_count;
853 * Set this param to non-zero to load eax with the
854 * .text section address and breakpoint on module load.
855 * This is useful for use with gdb and add-symbol-file command.
857 static int break_on_load;
860 * Driver major number, defaults to zero to get auto
861 * assigned major number. May be forced as module parameter.
866 * Array of user specified options for ISA adapters.
868 static int io[MAX_ISA_DEVICES];
869 static int irq[MAX_ISA_DEVICES];
870 static int dma[MAX_ISA_DEVICES];
871 static int debug_level;
872 static int maxframe[MAX_TOTAL_DEVICES];
873 static int dosyncppp[MAX_TOTAL_DEVICES];
874 static int txdmabufs[MAX_TOTAL_DEVICES];
875 static int txholdbufs[MAX_TOTAL_DEVICES];
877 module_param(break_on_load, bool, 0);
878 module_param(ttymajor, int, 0);
879 module_param_array(io, int, NULL, 0);
880 module_param_array(irq, int, NULL, 0);
881 module_param_array(dma, int, NULL, 0);
882 module_param(debug_level, int, 0);
883 module_param_array(maxframe, int, NULL, 0);
884 module_param_array(dosyncppp, int, NULL, 0);
885 module_param_array(txdmabufs, int, NULL, 0);
886 module_param_array(txholdbufs, int, NULL, 0);
888 static char *driver_name = "SyncLink serial driver";
889 static char *driver_version = "$Revision: 4.38 $";
891 static int synclink_init_one (struct pci_dev *dev,
892 const struct pci_device_id *ent);
893 static void synclink_remove_one (struct pci_dev *dev);
895 static struct pci_device_id synclink_pci_tbl[] = {
896 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
897 { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
898 { 0, }, /* terminate list */
900 MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
902 MODULE_LICENSE("GPL");
904 static struct pci_driver synclink_pci_driver = {
906 .id_table = synclink_pci_tbl,
907 .probe = synclink_init_one,
908 .remove = __devexit_p(synclink_remove_one),
911 static struct tty_driver *serial_driver;
913 /* number of characters left in xmit buffer before we ask for more */
914 #define WAKEUP_CHARS 256
917 static void mgsl_change_params(struct mgsl_struct *info);
918 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
921 * 1st function defined in .text section. Calling this function in
922 * init_module() followed by a breakpoint allows a remote debugger
923 * (gdb) to get the .text address for the add-symbol-file command.
924 * This allows remote debugging of dynamically loadable modules.
926 static void* mgsl_get_text_ptr(void)
928 return mgsl_get_text_ptr;
931 static inline int mgsl_paranoia_check(struct mgsl_struct *info,
932 char *name, const char *routine)
934 #ifdef MGSL_PARANOIA_CHECK
935 static const char *badmagic =
936 "Warning: bad magic number for mgsl struct (%s) in %s\n";
937 static const char *badinfo =
938 "Warning: null mgsl_struct for (%s) in %s\n";
941 printk(badinfo, name, routine);
944 if (info->magic != MGSL_MAGIC) {
945 printk(badmagic, name, routine);
956 * line discipline callback wrappers
958 * The wrappers maintain line discipline references
959 * while calling into the line discipline.
961 * ldisc_receive_buf - pass receive data to line discipline
964 static void ldisc_receive_buf(struct tty_struct *tty,
965 const __u8 *data, char *flags, int count)
967 struct tty_ldisc *ld;
970 ld = tty_ldisc_ref(tty);
972 if (ld->ops->receive_buf)
973 ld->ops->receive_buf(tty, data, flags, count);
978 /* mgsl_stop() throttle (stop) transmitter
980 * Arguments: tty pointer to tty info structure
983 static void mgsl_stop(struct tty_struct *tty)
985 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
988 if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
991 if ( debug_level >= DEBUG_LEVEL_INFO )
992 printk("mgsl_stop(%s)\n",info->device_name);
994 spin_lock_irqsave(&info->irq_spinlock,flags);
995 if (info->tx_enabled)
996 usc_stop_transmitter(info);
997 spin_unlock_irqrestore(&info->irq_spinlock,flags);
999 } /* end of mgsl_stop() */
1001 /* mgsl_start() release (start) transmitter
1003 * Arguments: tty pointer to tty info structure
1004 * Return Value: None
1006 static void mgsl_start(struct tty_struct *tty)
1008 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
1009 unsigned long flags;
1011 if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
1014 if ( debug_level >= DEBUG_LEVEL_INFO )
1015 printk("mgsl_start(%s)\n",info->device_name);
1017 spin_lock_irqsave(&info->irq_spinlock,flags);
1018 if (!info->tx_enabled)
1019 usc_start_transmitter(info);
1020 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1022 } /* end of mgsl_start() */
1025 * Bottom half work queue access functions
1028 /* mgsl_bh_action() Return next bottom half action to perform.
1029 * Return Value: BH action code or 0 if nothing to do.
1031 static int mgsl_bh_action(struct mgsl_struct *info)
1033 unsigned long flags;
1036 spin_lock_irqsave(&info->irq_spinlock,flags);
1038 if (info->pending_bh & BH_RECEIVE) {
1039 info->pending_bh &= ~BH_RECEIVE;
1041 } else if (info->pending_bh & BH_TRANSMIT) {
1042 info->pending_bh &= ~BH_TRANSMIT;
1044 } else if (info->pending_bh & BH_STATUS) {
1045 info->pending_bh &= ~BH_STATUS;
1050 /* Mark BH routine as complete */
1051 info->bh_running = false;
1052 info->bh_requested = false;
1055 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1061 * Perform bottom half processing of work items queued by ISR.
1063 static void mgsl_bh_handler(struct work_struct *work)
1065 struct mgsl_struct *info =
1066 container_of(work, struct mgsl_struct, task);
1072 if ( debug_level >= DEBUG_LEVEL_BH )
1073 printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
1074 __FILE__,__LINE__,info->device_name);
1076 info->bh_running = true;
1078 while((action = mgsl_bh_action(info)) != 0) {
1080 /* Process work item */
1081 if ( debug_level >= DEBUG_LEVEL_BH )
1082 printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
1083 __FILE__,__LINE__,action);
1088 mgsl_bh_receive(info);
1091 mgsl_bh_transmit(info);
1094 mgsl_bh_status(info);
1097 /* unknown work item ID */
1098 printk("Unknown work item ID=%08X!\n", action);
1103 if ( debug_level >= DEBUG_LEVEL_BH )
1104 printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
1105 __FILE__,__LINE__,info->device_name);
1108 static void mgsl_bh_receive(struct mgsl_struct *info)
1110 bool (*get_rx_frame)(struct mgsl_struct *info) =
1111 (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
1113 if ( debug_level >= DEBUG_LEVEL_BH )
1114 printk( "%s(%d):mgsl_bh_receive(%s)\n",
1115 __FILE__,__LINE__,info->device_name);
1119 if (info->rx_rcc_underrun) {
1120 unsigned long flags;
1121 spin_lock_irqsave(&info->irq_spinlock,flags);
1122 usc_start_receiver(info);
1123 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1126 } while(get_rx_frame(info));
1129 static void mgsl_bh_transmit(struct mgsl_struct *info)
1131 struct tty_struct *tty = info->port.tty;
1132 unsigned long flags;
1134 if ( debug_level >= DEBUG_LEVEL_BH )
1135 printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
1136 __FILE__,__LINE__,info->device_name);
1141 /* if transmitter idle and loopmode_send_done_requested
1142 * then start echoing RxD to TxD
1144 spin_lock_irqsave(&info->irq_spinlock,flags);
1145 if ( !info->tx_active && info->loopmode_send_done_requested )
1146 usc_loopmode_send_done( info );
1147 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1150 static void mgsl_bh_status(struct mgsl_struct *info)
1152 if ( debug_level >= DEBUG_LEVEL_BH )
1153 printk( "%s(%d):mgsl_bh_status() entry on %s\n",
1154 __FILE__,__LINE__,info->device_name);
1156 info->ri_chkcount = 0;
1157 info->dsr_chkcount = 0;
1158 info->dcd_chkcount = 0;
1159 info->cts_chkcount = 0;
1162 /* mgsl_isr_receive_status()
1164 * Service a receive status interrupt. The type of status
1165 * interrupt is indicated by the state of the RCSR.
1166 * This is only used for HDLC mode.
1168 * Arguments: info pointer to device instance data
1169 * Return Value: None
1171 static void mgsl_isr_receive_status( struct mgsl_struct *info )
1173 u16 status = usc_InReg( info, RCSR );
1175 if ( debug_level >= DEBUG_LEVEL_ISR )
1176 printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
1177 __FILE__,__LINE__,status);
1179 if ( (status & RXSTATUS_ABORT_RECEIVED) &&
1180 info->loopmode_insert_requested &&
1181 usc_loopmode_active(info) )
1183 ++info->icount.rxabort;
1184 info->loopmode_insert_requested = false;
1186 /* clear CMR:13 to start echoing RxD to TxD */
1187 info->cmr_value &= ~BIT13;
1188 usc_OutReg(info, CMR, info->cmr_value);
1190 /* disable received abort irq (no longer required) */
1191 usc_OutReg(info, RICR,
1192 (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
1195 if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
1196 if (status & RXSTATUS_EXITED_HUNT)
1197 info->icount.exithunt++;
1198 if (status & RXSTATUS_IDLE_RECEIVED)
1199 info->icount.rxidle++;
1200 wake_up_interruptible(&info->event_wait_q);
1203 if (status & RXSTATUS_OVERRUN){
1204 info->icount.rxover++;
1205 usc_process_rxoverrun_sync( info );
1208 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
1209 usc_UnlatchRxstatusBits( info, status );
1211 } /* end of mgsl_isr_receive_status() */
1213 /* mgsl_isr_transmit_status()
1215 * Service a transmit status interrupt
1216 * HDLC mode :end of transmit frame
1217 * Async mode:all data is sent
1218 * transmit status is indicated by bits in the TCSR.
1220 * Arguments: info pointer to device instance data
1221 * Return Value: None
1223 static void mgsl_isr_transmit_status( struct mgsl_struct *info )
1225 u16 status = usc_InReg( info, TCSR );
1227 if ( debug_level >= DEBUG_LEVEL_ISR )
1228 printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
1229 __FILE__,__LINE__,status);
1231 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
1232 usc_UnlatchTxstatusBits( info, status );
1234 if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
1236 /* finished sending HDLC abort. This may leave */
1237 /* the TxFifo with data from the aborted frame */
1238 /* so purge the TxFifo. Also shutdown the DMA */
1239 /* channel in case there is data remaining in */
1240 /* the DMA buffer */
1241 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
1242 usc_RTCmd( info, RTCmd_PurgeTxFifo );
1245 if ( status & TXSTATUS_EOF_SENT )
1246 info->icount.txok++;
1247 else if ( status & TXSTATUS_UNDERRUN )
1248 info->icount.txunder++;
1249 else if ( status & TXSTATUS_ABORT_SENT )
1250 info->icount.txabort++;
1252 info->icount.txunder++;
1254 info->tx_active = false;
1255 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1256 del_timer(&info->tx_timer);
1258 if ( info->drop_rts_on_tx_done ) {
1259 usc_get_serial_signals( info );
1260 if ( info->serial_signals & SerialSignal_RTS ) {
1261 info->serial_signals &= ~SerialSignal_RTS;
1262 usc_set_serial_signals( info );
1264 info->drop_rts_on_tx_done = false;
1267 #if SYNCLINK_GENERIC_HDLC
1269 hdlcdev_tx_done(info);
1273 if (info->port.tty->stopped || info->port.tty->hw_stopped) {
1274 usc_stop_transmitter(info);
1277 info->pending_bh |= BH_TRANSMIT;
1280 } /* end of mgsl_isr_transmit_status() */
1282 /* mgsl_isr_io_pin()
1284 * Service an Input/Output pin interrupt. The type of
1285 * interrupt is indicated by bits in the MISR
1287 * Arguments: info pointer to device instance data
1288 * Return Value: None
1290 static void mgsl_isr_io_pin( struct mgsl_struct *info )
1292 struct mgsl_icount *icount;
1293 u16 status = usc_InReg( info, MISR );
1295 if ( debug_level >= DEBUG_LEVEL_ISR )
1296 printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
1297 __FILE__,__LINE__,status);
1299 usc_ClearIrqPendingBits( info, IO_PIN );
1300 usc_UnlatchIostatusBits( info, status );
1302 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
1303 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
1304 icount = &info->icount;
1305 /* update input line counters */
1306 if (status & MISCSTATUS_RI_LATCHED) {
1307 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1308 usc_DisablestatusIrqs(info,SICR_RI);
1310 if ( status & MISCSTATUS_RI )
1311 info->input_signal_events.ri_up++;
1313 info->input_signal_events.ri_down++;
1315 if (status & MISCSTATUS_DSR_LATCHED) {
1316 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1317 usc_DisablestatusIrqs(info,SICR_DSR);
1319 if ( status & MISCSTATUS_DSR )
1320 info->input_signal_events.dsr_up++;
1322 info->input_signal_events.dsr_down++;
1324 if (status & MISCSTATUS_DCD_LATCHED) {
1325 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1326 usc_DisablestatusIrqs(info,SICR_DCD);
1328 if (status & MISCSTATUS_DCD) {
1329 info->input_signal_events.dcd_up++;
1331 info->input_signal_events.dcd_down++;
1332 #if SYNCLINK_GENERIC_HDLC
1333 if (info->netcount) {
1334 if (status & MISCSTATUS_DCD)
1335 netif_carrier_on(info->netdev);
1337 netif_carrier_off(info->netdev);
1341 if (status & MISCSTATUS_CTS_LATCHED)
1343 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1344 usc_DisablestatusIrqs(info,SICR_CTS);
1346 if ( status & MISCSTATUS_CTS )
1347 info->input_signal_events.cts_up++;
1349 info->input_signal_events.cts_down++;
1351 wake_up_interruptible(&info->status_event_wait_q);
1352 wake_up_interruptible(&info->event_wait_q);
1354 if ( (info->port.flags & ASYNC_CHECK_CD) &&
1355 (status & MISCSTATUS_DCD_LATCHED) ) {
1356 if ( debug_level >= DEBUG_LEVEL_ISR )
1357 printk("%s CD now %s...", info->device_name,
1358 (status & MISCSTATUS_DCD) ? "on" : "off");
1359 if (status & MISCSTATUS_DCD)
1360 wake_up_interruptible(&info->port.open_wait);
1362 if ( debug_level >= DEBUG_LEVEL_ISR )
1363 printk("doing serial hangup...");
1365 tty_hangup(info->port.tty);
1369 if ( (info->port.flags & ASYNC_CTS_FLOW) &&
1370 (status & MISCSTATUS_CTS_LATCHED) ) {
1371 if (info->port.tty->hw_stopped) {
1372 if (status & MISCSTATUS_CTS) {
1373 if ( debug_level >= DEBUG_LEVEL_ISR )
1374 printk("CTS tx start...");
1376 info->port.tty->hw_stopped = 0;
1377 usc_start_transmitter(info);
1378 info->pending_bh |= BH_TRANSMIT;
1382 if (!(status & MISCSTATUS_CTS)) {
1383 if ( debug_level >= DEBUG_LEVEL_ISR )
1384 printk("CTS tx stop...");
1386 info->port.tty->hw_stopped = 1;
1387 usc_stop_transmitter(info);
1393 info->pending_bh |= BH_STATUS;
1395 /* for diagnostics set IRQ flag */
1396 if ( status & MISCSTATUS_TXC_LATCHED ){
1397 usc_OutReg( info, SICR,
1398 (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
1399 usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
1400 info->irq_occurred = true;
1403 } /* end of mgsl_isr_io_pin() */
1405 /* mgsl_isr_transmit_data()
1407 * Service a transmit data interrupt (async mode only).
1409 * Arguments: info pointer to device instance data
1410 * Return Value: None
1412 static void mgsl_isr_transmit_data( struct mgsl_struct *info )
1414 if ( debug_level >= DEBUG_LEVEL_ISR )
1415 printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
1416 __FILE__,__LINE__,info->xmit_cnt);
1418 usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
1420 if (info->port.tty->stopped || info->port.tty->hw_stopped) {
1421 usc_stop_transmitter(info);
1425 if ( info->xmit_cnt )
1426 usc_load_txfifo( info );
1428 info->tx_active = false;
1430 if (info->xmit_cnt < WAKEUP_CHARS)
1431 info->pending_bh |= BH_TRANSMIT;
1433 } /* end of mgsl_isr_transmit_data() */
1435 /* mgsl_isr_receive_data()
1437 * Service a receive data interrupt. This occurs
1438 * when operating in asynchronous interrupt transfer mode.
1439 * The receive data FIFO is flushed to the receive data buffers.
1441 * Arguments: info pointer to device instance data
1442 * Return Value: None
1444 static void mgsl_isr_receive_data( struct mgsl_struct *info )
1449 unsigned char DataByte;
1450 struct tty_struct *tty = info->port.tty;
1451 struct mgsl_icount *icount = &info->icount;
1453 if ( debug_level >= DEBUG_LEVEL_ISR )
1454 printk("%s(%d):mgsl_isr_receive_data\n",
1457 usc_ClearIrqPendingBits( info, RECEIVE_DATA );
1459 /* select FIFO status for RICR readback */
1460 usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
1462 /* clear the Wordstatus bit so that status readback */
1463 /* only reflects the status of this byte */
1464 usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
1466 /* flush the receive FIFO */
1468 while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
1471 /* read one byte from RxFIFO */
1472 outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
1473 info->io_base + CCAR );
1474 DataByte = inb( info->io_base + CCAR );
1476 /* get the status of the received byte */
1477 status = usc_InReg(info, RCSR);
1478 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1479 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
1480 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
1485 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1486 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
1487 printk("rxerr=%04X\n",status);
1488 /* update error statistics */
1489 if ( status & RXSTATUS_BREAK_RECEIVED ) {
1490 status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
1492 } else if (status & RXSTATUS_PARITY_ERROR)
1494 else if (status & RXSTATUS_FRAMING_ERROR)
1496 else if (status & RXSTATUS_OVERRUN) {
1497 /* must issue purge fifo cmd before */
1498 /* 16C32 accepts more receive chars */
1499 usc_RTCmd(info,RTCmd_PurgeRxFifo);
1503 /* discard char if tty control flags say so */
1504 if (status & info->ignore_status_mask)
1507 status &= info->read_status_mask;
1509 if (status & RXSTATUS_BREAK_RECEIVED) {
1511 if (info->port.flags & ASYNC_SAK)
1513 } else if (status & RXSTATUS_PARITY_ERROR)
1515 else if (status & RXSTATUS_FRAMING_ERROR)
1517 } /* end of if (error) */
1518 tty_insert_flip_char(tty, DataByte, flag);
1519 if (status & RXSTATUS_OVERRUN) {
1520 /* Overrun is special, since it's
1521 * reported immediately, and doesn't
1522 * affect the current character
1524 work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1528 if ( debug_level >= DEBUG_LEVEL_ISR ) {
1529 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1530 __FILE__,__LINE__,icount->rx,icount->brk,
1531 icount->parity,icount->frame,icount->overrun);
1535 tty_flip_buffer_push(tty);
1540 * Service a miscellaneous interrupt source.
1542 * Arguments: info pointer to device extension (instance data)
1543 * Return Value: None
1545 static void mgsl_isr_misc( struct mgsl_struct *info )
1547 u16 status = usc_InReg( info, MISR );
1549 if ( debug_level >= DEBUG_LEVEL_ISR )
1550 printk("%s(%d):mgsl_isr_misc status=%04X\n",
1551 __FILE__,__LINE__,status);
1553 if ((status & MISCSTATUS_RCC_UNDERRUN) &&
1554 (info->params.mode == MGSL_MODE_HDLC)) {
1556 /* turn off receiver and rx DMA */
1557 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
1558 usc_DmaCmd(info, DmaCmd_ResetRxChannel);
1559 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
1560 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
1561 usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
1563 /* schedule BH handler to restart receiver */
1564 info->pending_bh |= BH_RECEIVE;
1565 info->rx_rcc_underrun = true;
1568 usc_ClearIrqPendingBits( info, MISC );
1569 usc_UnlatchMiscstatusBits( info, status );
1571 } /* end of mgsl_isr_misc() */
1575 * Services undefined interrupt vectors from the
1576 * USC. (hence this function SHOULD never be called)
1578 * Arguments: info pointer to device extension (instance data)
1579 * Return Value: None
1581 static void mgsl_isr_null( struct mgsl_struct *info )
1584 } /* end of mgsl_isr_null() */
1586 /* mgsl_isr_receive_dma()
1588 * Service a receive DMA channel interrupt.
1589 * For this driver there are two sources of receive DMA interrupts
1590 * as identified in the Receive DMA mode Register (RDMR):
1592 * BIT3 EOA/EOL End of List, all receive buffers in receive
1593 * buffer list have been filled (no more free buffers
1594 * available). The DMA controller has shut down.
1596 * BIT2 EOB End of Buffer. This interrupt occurs when a receive
1597 * DMA buffer is terminated in response to completion
1598 * of a good frame or a frame with errors. The status
1599 * of the frame is stored in the buffer entry in the
1600 * list of receive buffer entries.
1602 * Arguments: info pointer to device instance data
1603 * Return Value: None
1605 static void mgsl_isr_receive_dma( struct mgsl_struct *info )
1609 /* clear interrupt pending and IUS bit for Rx DMA IRQ */
1610 usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
1612 /* Read the receive DMA status to identify interrupt type. */
1613 /* This also clears the status bits. */
1614 status = usc_InDmaReg( info, RDMR );
1616 if ( debug_level >= DEBUG_LEVEL_ISR )
1617 printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
1618 __FILE__,__LINE__,info->device_name,status);
1620 info->pending_bh |= BH_RECEIVE;
1622 if ( status & BIT3 ) {
1623 info->rx_overflow = true;
1624 info->icount.buf_overrun++;
1627 } /* end of mgsl_isr_receive_dma() */
1629 /* mgsl_isr_transmit_dma()
1631 * This function services a transmit DMA channel interrupt.
1633 * For this driver there is one source of transmit DMA interrupts
1634 * as identified in the Transmit DMA Mode Register (TDMR):
1636 * BIT2 EOB End of Buffer. This interrupt occurs when a
1637 * transmit DMA buffer has been emptied.
1639 * The driver maintains enough transmit DMA buffers to hold at least
1640 * one max frame size transmit frame. When operating in a buffered
1641 * transmit mode, there may be enough transmit DMA buffers to hold at
1642 * least two or more max frame size frames. On an EOB condition,
1643 * determine if there are any queued transmit buffers and copy into
1644 * transmit DMA buffers if we have room.
1646 * Arguments: info pointer to device instance data
1647 * Return Value: None
1649 static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
1653 /* clear interrupt pending and IUS bit for Tx DMA IRQ */
1654 usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
1656 /* Read the transmit DMA status to identify interrupt type. */
1657 /* This also clears the status bits. */
1659 status = usc_InDmaReg( info, TDMR );
1661 if ( debug_level >= DEBUG_LEVEL_ISR )
1662 printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
1663 __FILE__,__LINE__,info->device_name,status);
1665 if ( status & BIT2 ) {
1666 --info->tx_dma_buffers_used;
1668 /* if there are transmit frames queued,
1669 * try to load the next one
1671 if ( load_next_tx_holding_buffer(info) ) {
1672 /* if call returns non-zero value, we have
1673 * at least one free tx holding buffer
1675 info->pending_bh |= BH_TRANSMIT;
1679 } /* end of mgsl_isr_transmit_dma() */
1683 * Interrupt service routine entry point.
1687 * irq interrupt number that caused interrupt
1688 * dev_id device ID supplied during interrupt registration
1690 * Return Value: None
1692 static irqreturn_t mgsl_interrupt(int dummy, void *dev_id)
1694 struct mgsl_struct *info = dev_id;
1698 if ( debug_level >= DEBUG_LEVEL_ISR )
1699 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)entry.\n",
1700 __FILE__, __LINE__, info->irq_level);
1702 spin_lock(&info->irq_spinlock);
1705 /* Read the interrupt vectors from hardware. */
1706 UscVector = usc_InReg(info, IVR) >> 9;
1707 DmaVector = usc_InDmaReg(info, DIVR);
1709 if ( debug_level >= DEBUG_LEVEL_ISR )
1710 printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
1711 __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
1713 if ( !UscVector && !DmaVector )
1716 /* Dispatch interrupt vector */
1718 (*UscIsrTable[UscVector])(info);
1719 else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
1720 mgsl_isr_transmit_dma(info);
1722 mgsl_isr_receive_dma(info);
1724 if ( info->isr_overflow ) {
1725 printk(KERN_ERR "%s(%d):%s isr overflow irq=%d\n",
1726 __FILE__, __LINE__, info->device_name, info->irq_level);
1727 usc_DisableMasterIrqBit(info);
1728 usc_DisableDmaInterrupts(info,DICR_MASTER);
1733 /* Request bottom half processing if there's something
1734 * for it to do and the bh is not already running
1737 if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
1738 if ( debug_level >= DEBUG_LEVEL_ISR )
1739 printk("%s(%d):%s queueing bh task.\n",
1740 __FILE__,__LINE__,info->device_name);
1741 schedule_work(&info->task);
1742 info->bh_requested = true;
1745 spin_unlock(&info->irq_spinlock);
1747 if ( debug_level >= DEBUG_LEVEL_ISR )
1748 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)exit.\n",
1749 __FILE__, __LINE__, info->irq_level);
1752 } /* end of mgsl_interrupt() */
1756 * Initialize and start device.
1758 * Arguments: info pointer to device instance data
1759 * Return Value: 0 if success, otherwise error code
1761 static int startup(struct mgsl_struct * info)
1765 if ( debug_level >= DEBUG_LEVEL_INFO )
1766 printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
1768 if (info->port.flags & ASYNC_INITIALIZED)
1771 if (!info->xmit_buf) {
1772 /* allocate a page of memory for a transmit buffer */
1773 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1774 if (!info->xmit_buf) {
1775 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1776 __FILE__,__LINE__,info->device_name);
1781 info->pending_bh = 0;
1783 memset(&info->icount, 0, sizeof(info->icount));
1785 setup_timer(&info->tx_timer, mgsl_tx_timeout, (unsigned long)info);
1787 /* Allocate and claim adapter resources */
1788 retval = mgsl_claim_resources(info);
1790 /* perform existence check and diagnostics */
1792 retval = mgsl_adapter_test(info);
1795 if (capable(CAP_SYS_ADMIN) && info->port.tty)
1796 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1797 mgsl_release_resources(info);
1801 /* program hardware for current parameters */
1802 mgsl_change_params(info);
1805 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
1807 info->port.flags |= ASYNC_INITIALIZED;
1811 } /* end of startup() */
1815 * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
1817 * Arguments: info pointer to device instance data
1818 * Return Value: None
1820 static void shutdown(struct mgsl_struct * info)
1822 unsigned long flags;
1824 if (!(info->port.flags & ASYNC_INITIALIZED))
1827 if (debug_level >= DEBUG_LEVEL_INFO)
1828 printk("%s(%d):mgsl_shutdown(%s)\n",
1829 __FILE__,__LINE__, info->device_name );
1831 /* clear status wait queue because status changes */
1832 /* can't happen after shutting down the hardware */
1833 wake_up_interruptible(&info->status_event_wait_q);
1834 wake_up_interruptible(&info->event_wait_q);
1836 del_timer_sync(&info->tx_timer);
1838 if (info->xmit_buf) {
1839 free_page((unsigned long) info->xmit_buf);
1840 info->xmit_buf = NULL;
1843 spin_lock_irqsave(&info->irq_spinlock,flags);
1844 usc_DisableMasterIrqBit(info);
1845 usc_stop_receiver(info);
1846 usc_stop_transmitter(info);
1847 usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
1848 TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
1849 usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
1851 /* Disable DMAEN (Port 7, Bit 14) */
1852 /* This disconnects the DMA request signal from the ISA bus */
1853 /* on the ISA adapter. This has no effect for the PCI adapter */
1854 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
1856 /* Disable INTEN (Port 6, Bit12) */
1857 /* This disconnects the IRQ request signal to the ISA bus */
1858 /* on the ISA adapter. This has no effect for the PCI adapter */
1859 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
1861 if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
1862 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1863 usc_set_serial_signals(info);
1866 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1868 mgsl_release_resources(info);
1871 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
1873 info->port.flags &= ~ASYNC_INITIALIZED;
1875 } /* end of shutdown() */
1877 static void mgsl_program_hw(struct mgsl_struct *info)
1879 unsigned long flags;
1881 spin_lock_irqsave(&info->irq_spinlock,flags);
1883 usc_stop_receiver(info);
1884 usc_stop_transmitter(info);
1885 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1887 if (info->params.mode == MGSL_MODE_HDLC ||
1888 info->params.mode == MGSL_MODE_RAW ||
1890 usc_set_sync_mode(info);
1892 usc_set_async_mode(info);
1894 usc_set_serial_signals(info);
1896 info->dcd_chkcount = 0;
1897 info->cts_chkcount = 0;
1898 info->ri_chkcount = 0;
1899 info->dsr_chkcount = 0;
1901 usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
1902 usc_EnableInterrupts(info, IO_PIN);
1903 usc_get_serial_signals(info);
1905 if (info->netcount || info->port.tty->termios->c_cflag & CREAD)
1906 usc_start_receiver(info);
1908 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1911 /* Reconfigure adapter based on new parameters
1913 static void mgsl_change_params(struct mgsl_struct *info)
1918 if (!info->port.tty || !info->port.tty->termios)
1921 if (debug_level >= DEBUG_LEVEL_INFO)
1922 printk("%s(%d):mgsl_change_params(%s)\n",
1923 __FILE__,__LINE__, info->device_name );
1925 cflag = info->port.tty->termios->c_cflag;
1927 /* if B0 rate (hangup) specified then negate DTR and RTS */
1928 /* otherwise assert DTR and RTS */
1930 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1932 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1934 /* byte size and parity */
1936 switch (cflag & CSIZE) {
1937 case CS5: info->params.data_bits = 5; break;
1938 case CS6: info->params.data_bits = 6; break;
1939 case CS7: info->params.data_bits = 7; break;
1940 case CS8: info->params.data_bits = 8; break;
1941 /* Never happens, but GCC is too dumb to figure it out */
1942 default: info->params.data_bits = 7; break;
1946 info->params.stop_bits = 2;
1948 info->params.stop_bits = 1;
1950 info->params.parity = ASYNC_PARITY_NONE;
1951 if (cflag & PARENB) {
1953 info->params.parity = ASYNC_PARITY_ODD;
1955 info->params.parity = ASYNC_PARITY_EVEN;
1958 info->params.parity = ASYNC_PARITY_SPACE;
1962 /* calculate number of jiffies to transmit a full
1963 * FIFO (32 bytes) at specified data rate
1965 bits_per_char = info->params.data_bits +
1966 info->params.stop_bits + 1;
1968 /* if port data rate is set to 460800 or less then
1969 * allow tty settings to override, otherwise keep the
1970 * current data rate.
1972 if (info->params.data_rate <= 460800)
1973 info->params.data_rate = tty_get_baud_rate(info->port.tty);
1975 if ( info->params.data_rate ) {
1976 info->timeout = (32*HZ*bits_per_char) /
1977 info->params.data_rate;
1979 info->timeout += HZ/50; /* Add .02 seconds of slop */
1981 if (cflag & CRTSCTS)
1982 info->port.flags |= ASYNC_CTS_FLOW;
1984 info->port.flags &= ~ASYNC_CTS_FLOW;
1987 info->port.flags &= ~ASYNC_CHECK_CD;
1989 info->port.flags |= ASYNC_CHECK_CD;
1991 /* process tty input control flags */
1993 info->read_status_mask = RXSTATUS_OVERRUN;
1994 if (I_INPCK(info->port.tty))
1995 info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
1996 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
1997 info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
1999 if (I_IGNPAR(info->port.tty))
2000 info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2001 if (I_IGNBRK(info->port.tty)) {
2002 info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
2003 /* If ignoring parity and break indicators, ignore
2004 * overruns too. (For real raw support).
2006 if (I_IGNPAR(info->port.tty))
2007 info->ignore_status_mask |= RXSTATUS_OVERRUN;
2010 mgsl_program_hw(info);
2012 } /* end of mgsl_change_params() */
2016 * Add a character to the transmit buffer.
2018 * Arguments: tty pointer to tty information structure
2019 * ch character to add to transmit buffer
2021 * Return Value: None
2023 static int mgsl_put_char(struct tty_struct *tty, unsigned char ch)
2025 struct mgsl_struct *info = tty->driver_data;
2026 unsigned long flags;
2029 if (debug_level >= DEBUG_LEVEL_INFO) {
2030 printk(KERN_DEBUG "%s(%d):mgsl_put_char(%d) on %s\n",
2031 __FILE__, __LINE__, ch, info->device_name);
2034 if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
2037 if (!tty || !info->xmit_buf)
2040 spin_lock_irqsave(&info->irq_spinlock, flags);
2042 if ((info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active) {
2043 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
2044 info->xmit_buf[info->xmit_head++] = ch;
2045 info->xmit_head &= SERIAL_XMIT_SIZE-1;
2050 spin_unlock_irqrestore(&info->irq_spinlock, flags);
2053 } /* end of mgsl_put_char() */
2055 /* mgsl_flush_chars()
2057 * Enable transmitter so remaining characters in the
2058 * transmit buffer are sent.
2060 * Arguments: tty pointer to tty information structure
2061 * Return Value: None
2063 static void mgsl_flush_chars(struct tty_struct *tty)
2065 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2066 unsigned long flags;
2068 if ( debug_level >= DEBUG_LEVEL_INFO )
2069 printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
2070 __FILE__,__LINE__,info->device_name,info->xmit_cnt);
2072 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
2075 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
2079 if ( debug_level >= DEBUG_LEVEL_INFO )
2080 printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
2081 __FILE__,__LINE__,info->device_name );
2083 spin_lock_irqsave(&info->irq_spinlock,flags);
2085 if (!info->tx_active) {
2086 if ( (info->params.mode == MGSL_MODE_HDLC ||
2087 info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
2088 /* operating in synchronous (frame oriented) mode */
2089 /* copy data from circular xmit_buf to */
2090 /* transmit DMA buffer. */
2091 mgsl_load_tx_dma_buffer(info,
2092 info->xmit_buf,info->xmit_cnt);
2094 usc_start_transmitter(info);
2097 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2099 } /* end of mgsl_flush_chars() */
2103 * Send a block of data
2107 * tty pointer to tty information structure
2108 * buf pointer to buffer containing send data
2109 * count size of send data in bytes
2111 * Return Value: number of characters written
2113 static int mgsl_write(struct tty_struct * tty,
2114 const unsigned char *buf, int count)
2117 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2118 unsigned long flags;
2120 if ( debug_level >= DEBUG_LEVEL_INFO )
2121 printk( "%s(%d):mgsl_write(%s) count=%d\n",
2122 __FILE__,__LINE__,info->device_name,count);
2124 if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
2127 if (!tty || !info->xmit_buf)
2130 if ( info->params.mode == MGSL_MODE_HDLC ||
2131 info->params.mode == MGSL_MODE_RAW ) {
2132 /* operating in synchronous (frame oriented) mode */
2133 /* operating in synchronous (frame oriented) mode */
2134 if (info->tx_active) {
2136 if ( info->params.mode == MGSL_MODE_HDLC ) {
2140 /* transmitter is actively sending data -
2141 * if we have multiple transmit dma and
2142 * holding buffers, attempt to queue this
2143 * frame for transmission at a later time.
2145 if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
2146 /* no tx holding buffers available */
2151 /* queue transmit frame request */
2153 save_tx_buffer_request(info,buf,count);
2155 /* if we have sufficient tx dma buffers,
2156 * load the next buffered tx request
2158 spin_lock_irqsave(&info->irq_spinlock,flags);
2159 load_next_tx_holding_buffer(info);
2160 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2164 /* if operating in HDLC LoopMode and the adapter */
2165 /* has yet to be inserted into the loop, we can't */
2168 if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
2169 !usc_loopmode_active(info) )
2175 if ( info->xmit_cnt ) {
2176 /* Send accumulated from send_char() calls */
2177 /* as frame and wait before accepting more data. */
2180 /* copy data from circular xmit_buf to */
2181 /* transmit DMA buffer. */
2182 mgsl_load_tx_dma_buffer(info,
2183 info->xmit_buf,info->xmit_cnt);
2184 if ( debug_level >= DEBUG_LEVEL_INFO )
2185 printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
2186 __FILE__,__LINE__,info->device_name);
2188 if ( debug_level >= DEBUG_LEVEL_INFO )
2189 printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
2190 __FILE__,__LINE__,info->device_name);
2192 info->xmit_cnt = count;
2193 mgsl_load_tx_dma_buffer(info,buf,count);
2197 spin_lock_irqsave(&info->irq_spinlock,flags);
2198 c = min_t(int, count,
2199 min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
2200 SERIAL_XMIT_SIZE - info->xmit_head));
2202 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2205 memcpy(info->xmit_buf + info->xmit_head, buf, c);
2206 info->xmit_head = ((info->xmit_head + c) &
2207 (SERIAL_XMIT_SIZE-1));
2208 info->xmit_cnt += c;
2209 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2216 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
2217 spin_lock_irqsave(&info->irq_spinlock,flags);
2218 if (!info->tx_active)
2219 usc_start_transmitter(info);
2220 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2223 if ( debug_level >= DEBUG_LEVEL_INFO )
2224 printk( "%s(%d):mgsl_write(%s) returning=%d\n",
2225 __FILE__,__LINE__,info->device_name,ret);
2229 } /* end of mgsl_write() */
2231 /* mgsl_write_room()
2233 * Return the count of free bytes in transmit buffer
2235 * Arguments: tty pointer to tty info structure
2236 * Return Value: None
2238 static int mgsl_write_room(struct tty_struct *tty)
2240 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2243 if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
2245 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
2249 if (debug_level >= DEBUG_LEVEL_INFO)
2250 printk("%s(%d):mgsl_write_room(%s)=%d\n",
2251 __FILE__,__LINE__, info->device_name,ret );
2253 if ( info->params.mode == MGSL_MODE_HDLC ||
2254 info->params.mode == MGSL_MODE_RAW ) {
2255 /* operating in synchronous (frame oriented) mode */
2256 if ( info->tx_active )
2259 return HDLC_MAX_FRAME_SIZE;
2264 } /* end of mgsl_write_room() */
2266 /* mgsl_chars_in_buffer()
2268 * Return the count of bytes in transmit buffer
2270 * Arguments: tty pointer to tty info structure
2271 * Return Value: None
2273 static int mgsl_chars_in_buffer(struct tty_struct *tty)
2275 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2277 if (debug_level >= DEBUG_LEVEL_INFO)
2278 printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
2279 __FILE__,__LINE__, info->device_name );
2281 if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
2284 if (debug_level >= DEBUG_LEVEL_INFO)
2285 printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
2286 __FILE__,__LINE__, info->device_name,info->xmit_cnt );
2288 if ( info->params.mode == MGSL_MODE_HDLC ||
2289 info->params.mode == MGSL_MODE_RAW ) {
2290 /* operating in synchronous (frame oriented) mode */
2291 if ( info->tx_active )
2292 return info->max_frame_size;
2297 return info->xmit_cnt;
2298 } /* end of mgsl_chars_in_buffer() */
2300 /* mgsl_flush_buffer()
2302 * Discard all data in the send buffer
2304 * Arguments: tty pointer to tty info structure
2305 * Return Value: None
2307 static void mgsl_flush_buffer(struct tty_struct *tty)
2309 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2310 unsigned long flags;
2312 if (debug_level >= DEBUG_LEVEL_INFO)
2313 printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
2314 __FILE__,__LINE__, info->device_name );
2316 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
2319 spin_lock_irqsave(&info->irq_spinlock,flags);
2320 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2321 del_timer(&info->tx_timer);
2322 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2327 /* mgsl_send_xchar()
2329 * Send a high-priority XON/XOFF character
2331 * Arguments: tty pointer to tty info structure
2332 * ch character to send
2333 * Return Value: None
2335 static void mgsl_send_xchar(struct tty_struct *tty, char ch)
2337 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2338 unsigned long flags;
2340 if (debug_level >= DEBUG_LEVEL_INFO)
2341 printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
2342 __FILE__,__LINE__, info->device_name, ch );
2344 if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
2349 /* Make sure transmit interrupts are on */
2350 spin_lock_irqsave(&info->irq_spinlock,flags);
2351 if (!info->tx_enabled)
2352 usc_start_transmitter(info);
2353 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2355 } /* end of mgsl_send_xchar() */
2359 * Signal remote device to throttle send data (our receive data)
2361 * Arguments: tty pointer to tty info structure
2362 * Return Value: None
2364 static void mgsl_throttle(struct tty_struct * tty)
2366 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2367 unsigned long flags;
2369 if (debug_level >= DEBUG_LEVEL_INFO)
2370 printk("%s(%d):mgsl_throttle(%s) entry\n",
2371 __FILE__,__LINE__, info->device_name );
2373 if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
2377 mgsl_send_xchar(tty, STOP_CHAR(tty));
2379 if (tty->termios->c_cflag & CRTSCTS) {
2380 spin_lock_irqsave(&info->irq_spinlock,flags);
2381 info->serial_signals &= ~SerialSignal_RTS;
2382 usc_set_serial_signals(info);
2383 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2385 } /* end of mgsl_throttle() */
2387 /* mgsl_unthrottle()
2389 * Signal remote device to stop throttling send data (our receive data)
2391 * Arguments: tty pointer to tty info structure
2392 * Return Value: None
2394 static void mgsl_unthrottle(struct tty_struct * tty)
2396 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2397 unsigned long flags;
2399 if (debug_level >= DEBUG_LEVEL_INFO)
2400 printk("%s(%d):mgsl_unthrottle(%s) entry\n",
2401 __FILE__,__LINE__, info->device_name );
2403 if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
2410 mgsl_send_xchar(tty, START_CHAR(tty));
2413 if (tty->termios->c_cflag & CRTSCTS) {
2414 spin_lock_irqsave(&info->irq_spinlock,flags);
2415 info->serial_signals |= SerialSignal_RTS;
2416 usc_set_serial_signals(info);
2417 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2420 } /* end of mgsl_unthrottle() */
2424 * get the current serial parameters information
2426 * Arguments: info pointer to device instance data
2427 * user_icount pointer to buffer to hold returned stats
2429 * Return Value: 0 if success, otherwise error code
2431 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
2435 if (debug_level >= DEBUG_LEVEL_INFO)
2436 printk("%s(%d):mgsl_get_params(%s)\n",
2437 __FILE__,__LINE__, info->device_name);
2440 memset(&info->icount, 0, sizeof(info->icount));
2442 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2449 } /* end of mgsl_get_stats() */
2451 /* mgsl_get_params()
2453 * get the current serial parameters information
2455 * Arguments: info pointer to device instance data
2456 * user_params pointer to buffer to hold returned params
2458 * Return Value: 0 if success, otherwise error code
2460 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
2463 if (debug_level >= DEBUG_LEVEL_INFO)
2464 printk("%s(%d):mgsl_get_params(%s)\n",
2465 __FILE__,__LINE__, info->device_name);
2467 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2469 if ( debug_level >= DEBUG_LEVEL_INFO )
2470 printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
2471 __FILE__,__LINE__,info->device_name);
2477 } /* end of mgsl_get_params() */
2479 /* mgsl_set_params()
2481 * set the serial parameters
2485 * info pointer to device instance data
2486 * new_params user buffer containing new serial params
2488 * Return Value: 0 if success, otherwise error code
2490 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
2492 unsigned long flags;
2493 MGSL_PARAMS tmp_params;
2496 if (debug_level >= DEBUG_LEVEL_INFO)
2497 printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
2498 info->device_name );
2499 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2501 if ( debug_level >= DEBUG_LEVEL_INFO )
2502 printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
2503 __FILE__,__LINE__,info->device_name);
2507 spin_lock_irqsave(&info->irq_spinlock,flags);
2508 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2509 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2511 mgsl_change_params(info);
2515 } /* end of mgsl_set_params() */
2517 /* mgsl_get_txidle()
2519 * get the current transmit idle mode
2521 * Arguments: info pointer to device instance data
2522 * idle_mode pointer to buffer to hold returned idle mode
2524 * Return Value: 0 if success, otherwise error code
2526 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
2530 if (debug_level >= DEBUG_LEVEL_INFO)
2531 printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
2532 __FILE__,__LINE__, info->device_name, info->idle_mode);
2534 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2536 if ( debug_level >= DEBUG_LEVEL_INFO )
2537 printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
2538 __FILE__,__LINE__,info->device_name);
2544 } /* end of mgsl_get_txidle() */
2546 /* mgsl_set_txidle() service ioctl to set transmit idle mode
2548 * Arguments: info pointer to device instance data
2549 * idle_mode new idle mode
2551 * Return Value: 0 if success, otherwise error code
2553 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
2555 unsigned long flags;
2557 if (debug_level >= DEBUG_LEVEL_INFO)
2558 printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
2559 info->device_name, idle_mode );
2561 spin_lock_irqsave(&info->irq_spinlock,flags);
2562 info->idle_mode = idle_mode;
2563 usc_set_txidle( info );
2564 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2567 } /* end of mgsl_set_txidle() */
2571 * enable or disable the transmitter
2575 * info pointer to device instance data
2576 * enable 1 = enable, 0 = disable
2578 * Return Value: 0 if success, otherwise error code
2580 static int mgsl_txenable(struct mgsl_struct * info, int enable)
2582 unsigned long flags;
2584 if (debug_level >= DEBUG_LEVEL_INFO)
2585 printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
2586 info->device_name, enable);
2588 spin_lock_irqsave(&info->irq_spinlock,flags);
2590 if ( !info->tx_enabled ) {
2592 usc_start_transmitter(info);
2593 /*--------------------------------------------------
2594 * if HDLC/SDLC Loop mode, attempt to insert the
2595 * station in the 'loop' by setting CMR:13. Upon
2596 * receipt of the next GoAhead (RxAbort) sequence,
2597 * the OnLoop indicator (CCSR:7) should go active
2598 * to indicate that we are on the loop
2599 *--------------------------------------------------*/
2600 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2601 usc_loopmode_insert_request( info );
2604 if ( info->tx_enabled )
2605 usc_stop_transmitter(info);
2607 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2610 } /* end of mgsl_txenable() */
2612 /* mgsl_txabort() abort send HDLC frame
2614 * Arguments: info pointer to device instance data
2615 * Return Value: 0 if success, otherwise error code
2617 static int mgsl_txabort(struct mgsl_struct * info)
2619 unsigned long flags;
2621 if (debug_level >= DEBUG_LEVEL_INFO)
2622 printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
2625 spin_lock_irqsave(&info->irq_spinlock,flags);
2626 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
2628 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2629 usc_loopmode_cancel_transmit( info );
2631 usc_TCmd(info,TCmd_SendAbort);
2633 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2636 } /* end of mgsl_txabort() */
2638 /* mgsl_rxenable() enable or disable the receiver
2640 * Arguments: info pointer to device instance data
2641 * enable 1 = enable, 0 = disable
2642 * Return Value: 0 if success, otherwise error code
2644 static int mgsl_rxenable(struct mgsl_struct * info, int enable)
2646 unsigned long flags;
2648 if (debug_level >= DEBUG_LEVEL_INFO)
2649 printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
2650 info->device_name, enable);
2652 spin_lock_irqsave(&info->irq_spinlock,flags);
2654 if ( !info->rx_enabled )
2655 usc_start_receiver(info);
2657 if ( info->rx_enabled )
2658 usc_stop_receiver(info);
2660 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2663 } /* end of mgsl_rxenable() */
2665 /* mgsl_wait_event() wait for specified event to occur
2667 * Arguments: info pointer to device instance data
2668 * mask pointer to bitmask of events to wait for
2669 * Return Value: 0 if successful and bit mask updated with
2670 * of events triggerred,
2671 * otherwise error code
2673 static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
2675 unsigned long flags;
2678 struct mgsl_icount cprev, cnow;
2681 struct _input_signal_events oldsigs, newsigs;
2682 DECLARE_WAITQUEUE(wait, current);
2684 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2689 if (debug_level >= DEBUG_LEVEL_INFO)
2690 printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
2691 info->device_name, mask);
2693 spin_lock_irqsave(&info->irq_spinlock,flags);
2695 /* return immediately if state matches requested events */
2696 usc_get_serial_signals(info);
2697 s = info->serial_signals;
2699 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2700 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2701 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2702 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2704 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2708 /* save current irq counts */
2709 cprev = info->icount;
2710 oldsigs = info->input_signal_events;
2712 /* enable hunt and idle irqs if needed */
2713 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2714 u16 oldreg = usc_InReg(info,RICR);
2715 u16 newreg = oldreg +
2716 (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
2717 (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
2718 if (oldreg != newreg)
2719 usc_OutReg(info, RICR, newreg);
2722 set_current_state(TASK_INTERRUPTIBLE);
2723 add_wait_queue(&info->event_wait_q, &wait);
2725 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2730 if (signal_pending(current)) {
2735 /* get current irq counts */
2736 spin_lock_irqsave(&info->irq_spinlock,flags);
2737 cnow = info->icount;
2738 newsigs = info->input_signal_events;
2739 set_current_state(TASK_INTERRUPTIBLE);
2740 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2742 /* if no change, wait aborted for some reason */
2743 if (newsigs.dsr_up == oldsigs.dsr_up &&
2744 newsigs.dsr_down == oldsigs.dsr_down &&
2745 newsigs.dcd_up == oldsigs.dcd_up &&
2746 newsigs.dcd_down == oldsigs.dcd_down &&
2747 newsigs.cts_up == oldsigs.cts_up &&
2748 newsigs.cts_down == oldsigs.cts_down &&
2749 newsigs.ri_up == oldsigs.ri_up &&
2750 newsigs.ri_down == oldsigs.ri_down &&
2751 cnow.exithunt == cprev.exithunt &&
2752 cnow.rxidle == cprev.rxidle) {
2758 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2759 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2760 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2761 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2762 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2763 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2764 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2765 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2766 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2767 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2775 remove_wait_queue(&info->event_wait_q, &wait);
2776 set_current_state(TASK_RUNNING);
2778 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2779 spin_lock_irqsave(&info->irq_spinlock,flags);
2780 if (!waitqueue_active(&info->event_wait_q)) {
2781 /* disable enable exit hunt mode/idle rcvd IRQs */
2782 usc_OutReg(info, RICR, usc_InReg(info,RICR) &
2783 ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
2785 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2789 PUT_USER(rc, events, mask_ptr);
2793 } /* end of mgsl_wait_event() */
2795 static int modem_input_wait(struct mgsl_struct *info,int arg)
2797 unsigned long flags;
2799 struct mgsl_icount cprev, cnow;
2800 DECLARE_WAITQUEUE(wait, current);
2802 /* save current irq counts */
2803 spin_lock_irqsave(&info->irq_spinlock,flags);
2804 cprev = info->icount;
2805 add_wait_queue(&info->status_event_wait_q, &wait);
2806 set_current_state(TASK_INTERRUPTIBLE);
2807 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2811 if (signal_pending(current)) {
2816 /* get new irq counts */
2817 spin_lock_irqsave(&info->irq_spinlock,flags);
2818 cnow = info->icount;
2819 set_current_state(TASK_INTERRUPTIBLE);
2820 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2822 /* if no change, wait aborted for some reason */
2823 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2824 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2829 /* check for change in caller specified modem input */
2830 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2831 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2832 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2833 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2840 remove_wait_queue(&info->status_event_wait_q, &wait);
2841 set_current_state(TASK_RUNNING);
2845 /* return the state of the serial control and status signals
2847 static int tiocmget(struct tty_struct *tty, struct file *file)
2849 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2850 unsigned int result;
2851 unsigned long flags;
2853 spin_lock_irqsave(&info->irq_spinlock,flags);
2854 usc_get_serial_signals(info);
2855 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2857 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2858 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2859 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2860 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2861 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2862 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2864 if (debug_level >= DEBUG_LEVEL_INFO)
2865 printk("%s(%d):%s tiocmget() value=%08X\n",
2866 __FILE__,__LINE__, info->device_name, result );
2870 /* set modem control signals (DTR/RTS)
2872 static int tiocmset(struct tty_struct *tty, struct file *file,
2873 unsigned int set, unsigned int clear)
2875 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2876 unsigned long flags;
2878 if (debug_level >= DEBUG_LEVEL_INFO)
2879 printk("%s(%d):%s tiocmset(%x,%x)\n",
2880 __FILE__,__LINE__,info->device_name, set, clear);
2882 if (set & TIOCM_RTS)
2883 info->serial_signals |= SerialSignal_RTS;
2884 if (set & TIOCM_DTR)
2885 info->serial_signals |= SerialSignal_DTR;
2886 if (clear & TIOCM_RTS)
2887 info->serial_signals &= ~SerialSignal_RTS;
2888 if (clear & TIOCM_DTR)
2889 info->serial_signals &= ~SerialSignal_DTR;
2891 spin_lock_irqsave(&info->irq_spinlock,flags);
2892 usc_set_serial_signals(info);
2893 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2898 /* mgsl_break() Set or clear transmit break condition
2900 * Arguments: tty pointer to tty instance data
2901 * break_state -1=set break condition, 0=clear
2902 * Return Value: None
2904 static void mgsl_break(struct tty_struct *tty, int break_state)
2906 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2907 unsigned long flags;
2909 if (debug_level >= DEBUG_LEVEL_INFO)
2910 printk("%s(%d):mgsl_break(%s,%d)\n",
2911 __FILE__,__LINE__, info->device_name, break_state);
2913 if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
2916 spin_lock_irqsave(&info->irq_spinlock,flags);
2917 if (break_state == -1)
2918 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
2920 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
2921 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2923 } /* end of mgsl_break() */
2925 /* mgsl_ioctl() Service an IOCTL request
2929 * tty pointer to tty instance data
2930 * file pointer to associated file object for device
2931 * cmd IOCTL command code
2932 * arg command argument/context
2934 * Return Value: 0 if success, otherwise error code
2936 static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
2937 unsigned int cmd, unsigned long arg)
2939 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2942 if (debug_level >= DEBUG_LEVEL_INFO)
2943 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2944 info->device_name, cmd );
2946 if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
2949 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2950 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2951 if (tty->flags & (1 << TTY_IO_ERROR))
2956 ret = mgsl_ioctl_common(info, cmd, arg);
2961 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
2964 struct mgsl_icount cnow; /* kernel counter temps */
2965 void __user *argp = (void __user *)arg;
2966 struct serial_icounter_struct __user *p_cuser; /* user space */
2967 unsigned long flags;
2970 case MGSL_IOCGPARAMS:
2971 return mgsl_get_params(info, argp);
2972 case MGSL_IOCSPARAMS:
2973 return mgsl_set_params(info, argp);
2974 case MGSL_IOCGTXIDLE:
2975 return mgsl_get_txidle(info, argp);
2976 case MGSL_IOCSTXIDLE:
2977 return mgsl_set_txidle(info,(int)arg);
2978 case MGSL_IOCTXENABLE:
2979 return mgsl_txenable(info,(int)arg);
2980 case MGSL_IOCRXENABLE:
2981 return mgsl_rxenable(info,(int)arg);
2982 case MGSL_IOCTXABORT:
2983 return mgsl_txabort(info);
2984 case MGSL_IOCGSTATS:
2985 return mgsl_get_stats(info, argp);
2986 case MGSL_IOCWAITEVENT:
2987 return mgsl_wait_event(info, argp);
2988 case MGSL_IOCLOOPTXDONE:
2989 return mgsl_loopmode_send_done(info);
2990 /* Wait for modem input (DCD,RI,DSR,CTS) change
2991 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
2994 return modem_input_wait(info,(int)arg);
2997 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
2998 * Return: write counters to the user passed counter struct
2999 * NB: both 1->0 and 0->1 transitions are counted except for
3000 * RI where only 0->1 is counted.
3003 spin_lock_irqsave(&info->irq_spinlock,flags);
3004 cnow = info->icount;
3005 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3007 PUT_USER(error,cnow.cts, &p_cuser->cts);
3008 if (error) return error;
3009 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
3010 if (error) return error;
3011 PUT_USER(error,cnow.rng, &p_cuser->rng);
3012 if (error) return error;
3013 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
3014 if (error) return error;
3015 PUT_USER(error,cnow.rx, &p_cuser->rx);
3016 if (error) return error;
3017 PUT_USER(error,cnow.tx, &p_cuser->tx);
3018 if (error) return error;
3019 PUT_USER(error,cnow.frame, &p_cuser->frame);
3020 if (error) return error;
3021 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
3022 if (error) return error;
3023 PUT_USER(error,cnow.parity, &p_cuser->parity);
3024 if (error) return error;
3025 PUT_USER(error,cnow.brk, &p_cuser->brk);
3026 if (error) return error;
3027 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
3028 if (error) return error;
3031 return -ENOIOCTLCMD;
3036 /* mgsl_set_termios()
3038 * Set new termios settings
3042 * tty pointer to tty structure
3043 * termios pointer to buffer to hold returned old termios
3045 * Return Value: None
3047 static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
3049 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
3050 unsigned long flags;
3052 if (debug_level >= DEBUG_LEVEL_INFO)
3053 printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
3054 tty->driver->name );
3056 mgsl_change_params(info);
3058 /* Handle transition to B0 status */
3059 if (old_termios->c_cflag & CBAUD &&
3060 !(tty->termios->c_cflag & CBAUD)) {
3061 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3062 spin_lock_irqsave(&info->irq_spinlock,flags);
3063 usc_set_serial_signals(info);
3064 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3067 /* Handle transition away from B0 status */
3068 if (!(old_termios->c_cflag & CBAUD) &&
3069 tty->termios->c_cflag & CBAUD) {
3070 info->serial_signals |= SerialSignal_DTR;
3071 if (!(tty->termios->c_cflag & CRTSCTS) ||
3072 !test_bit(TTY_THROTTLED, &tty->flags)) {
3073 info->serial_signals |= SerialSignal_RTS;
3075 spin_lock_irqsave(&info->irq_spinlock,flags);
3076 usc_set_serial_signals(info);
3077 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3080 /* Handle turning off CRTSCTS */
3081 if (old_termios->c_cflag & CRTSCTS &&
3082 !(tty->termios->c_cflag & CRTSCTS)) {
3083 tty->hw_stopped = 0;
3087 } /* end of mgsl_set_termios() */
3091 * Called when port is closed. Wait for remaining data to be
3092 * sent. Disable port and free resources.
3096 * tty pointer to open tty structure
3097 * filp pointer to open file object
3099 * Return Value: None
3101 static void mgsl_close(struct tty_struct *tty, struct file * filp)
3103 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3105 if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
3108 if (debug_level >= DEBUG_LEVEL_INFO)
3109 printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
3110 __FILE__,__LINE__, info->device_name, info->port.count);
3112 if (!info->port.count)
3115 if (tty_hung_up_p(filp))
3118 if ((tty->count == 1) && (info->port.count != 1)) {
3120 * tty->count is 1 and the tty structure will be freed.
3121 * info->port.count should be one in this case.
3122 * if it's not, correct it so that the port is shutdown.
3124 printk("mgsl_close: bad refcount; tty->count is 1, "
3125 "info->port.count is %d\n", info->port.count);
3126 info->port.count = 1;
3131 /* if at least one open remaining, leave hardware active */
3132 if (info->port.count)
3135 info->port.flags |= ASYNC_CLOSING;
3137 /* set tty->closing to notify line discipline to
3138 * only process XON/XOFF characters. Only the N_TTY
3139 * discipline appears to use this (ppp does not).
3143 /* wait for transmit data to clear all layers */
3145 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
3146 if (debug_level >= DEBUG_LEVEL_INFO)
3147 printk("%s(%d):mgsl_close(%s) calling tty_wait_until_sent\n",
3148 __FILE__,__LINE__, info->device_name );
3149 tty_wait_until_sent(tty, info->closing_wait);
3152 if (info->port.flags & ASYNC_INITIALIZED)
3153 mgsl_wait_until_sent(tty, info->timeout);
3155 mgsl_flush_buffer(tty);
3157 tty_ldisc_flush(tty);
3162 info->port.tty = NULL;
3164 if (info->port.blocked_open) {
3165 if (info->close_delay) {
3166 msleep_interruptible(jiffies_to_msecs(info->close_delay));
3168 wake_up_interruptible(&info->port.open_wait);
3171 info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
3173 wake_up_interruptible(&info->port.close_wait);
3176 if (debug_level >= DEBUG_LEVEL_INFO)
3177 printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
3178 tty->driver->name, info->port.count);
3180 } /* end of mgsl_close() */
3182 /* mgsl_wait_until_sent()
3184 * Wait until the transmitter is empty.
3188 * tty pointer to tty info structure
3189 * timeout time to wait for send completion
3191 * Return Value: None
3193 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
3195 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3196 unsigned long orig_jiffies, char_time;
3201 if (debug_level >= DEBUG_LEVEL_INFO)
3202 printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
3203 __FILE__,__LINE__, info->device_name );
3205 if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
3208 if (!(info->port.flags & ASYNC_INITIALIZED))
3211 orig_jiffies = jiffies;
3213 /* Set check interval to 1/5 of estimated time to
3214 * send a character, and make it at least 1. The check
3215 * interval should also be less than the timeout.
3216 * Note: use tight timings here to satisfy the NIST-PCTS.
3220 if ( info->params.data_rate ) {
3221 char_time = info->timeout/(32 * 5);
3228 char_time = min_t(unsigned long, char_time, timeout);
3230 if ( info->params.mode == MGSL_MODE_HDLC ||
3231 info->params.mode == MGSL_MODE_RAW ) {
3232 while (info->tx_active) {
3233 msleep_interruptible(jiffies_to_msecs(char_time));
3234 if (signal_pending(current))
3236 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3240 while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
3242 msleep_interruptible(jiffies_to_msecs(char_time));
3243 if (signal_pending(current))
3245 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3252 if (debug_level >= DEBUG_LEVEL_INFO)
3253 printk("%s(%d):mgsl_wait_until_sent(%s) exit\n",
3254 __FILE__,__LINE__, info->device_name );
3256 } /* end of mgsl_wait_until_sent() */
3260 * Called by tty_hangup() when a hangup is signaled.
3261 * This is the same as to closing all open files for the port.
3263 * Arguments: tty pointer to associated tty object
3264 * Return Value: None
3266 static void mgsl_hangup(struct tty_struct *tty)
3268 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3270 if (debug_level >= DEBUG_LEVEL_INFO)
3271 printk("%s(%d):mgsl_hangup(%s)\n",
3272 __FILE__,__LINE__, info->device_name );
3274 if (mgsl_paranoia_check(info, tty->name, "mgsl_hangup"))
3277 mgsl_flush_buffer(tty);
3280 info->port.count = 0;
3281 info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
3282 info->port.tty = NULL;
3284 wake_up_interruptible(&info->port.open_wait);
3286 } /* end of mgsl_hangup() */
3288 /* block_til_ready()
3290 * Block the current process until the specified port
3291 * is ready to be opened.
3295 * tty pointer to tty info structure
3296 * filp pointer to open file object
3297 * info pointer to device instance data
3299 * Return Value: 0 if success, otherwise error code
3301 static int block_til_ready(struct tty_struct *tty, struct file * filp,
3302 struct mgsl_struct *info)
3304 DECLARE_WAITQUEUE(wait, current);
3306 bool do_clocal = false;
3307 bool extra_count = false;
3308 unsigned long flags;
3310 if (debug_level >= DEBUG_LEVEL_INFO)
3311 printk("%s(%d):block_til_ready on %s\n",
3312 __FILE__,__LINE__, tty->driver->name );
3314 if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3315 /* nonblock mode is set or port is not enabled */
3316 info->port.flags |= ASYNC_NORMAL_ACTIVE;
3320 if (tty->termios->c_cflag & CLOCAL)
3323 /* Wait for carrier detect and the line to become
3324 * free (i.e., not in use by the callout). While we are in
3325 * this loop, info->port.count is dropped by one, so that
3326 * mgsl_close() knows when to free things. We restore it upon
3327 * exit, either normal or abnormal.
3331 add_wait_queue(&info->port.open_wait, &wait);
3333 if (debug_level >= DEBUG_LEVEL_INFO)
3334 printk("%s(%d):block_til_ready before block on %s count=%d\n",
3335 __FILE__,__LINE__, tty->driver->name, info->port.count );
3337 spin_lock_irqsave(&info->irq_spinlock, flags);
3338 if (!tty_hung_up_p(filp)) {
3342 spin_unlock_irqrestore(&info->irq_spinlock, flags);
3343 info->port.blocked_open++;
3346 if (tty->termios->c_cflag & CBAUD) {
3347 spin_lock_irqsave(&info->irq_spinlock,flags);
3348 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3349 usc_set_serial_signals(info);
3350 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3353 set_current_state(TASK_INTERRUPTIBLE);
3355 if (tty_hung_up_p(filp) || !(info->port.flags & ASYNC_INITIALIZED)){
3356 retval = (info->port.flags & ASYNC_HUP_NOTIFY) ?
3357 -EAGAIN : -ERESTARTSYS;
3361 spin_lock_irqsave(&info->irq_spinlock,flags);
3362 usc_get_serial_signals(info);
3363 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3365 if (!(info->port.flags & ASYNC_CLOSING) &&
3366 (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3370 if (signal_pending(current)) {
3371 retval = -ERESTARTSYS;
3375 if (debug_level >= DEBUG_LEVEL_INFO)
3376 printk("%s(%d):block_til_ready blocking on %s count=%d\n",
3377 __FILE__,__LINE__, tty->driver->name, info->port.count );
3382 set_current_state(TASK_RUNNING);
3383 remove_wait_queue(&info->port.open_wait, &wait);
3387 info->port.blocked_open--;
3389 if (debug_level >= DEBUG_LEVEL_INFO)
3390 printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
3391 __FILE__,__LINE__, tty->driver->name, info->port.count );
3394 info->port.flags |= ASYNC_NORMAL_ACTIVE;
3398 } /* end of block_til_ready() */
3402 * Called when a port is opened. Init and enable port.
3403 * Perform serial-specific initialization for the tty structure.
3405 * Arguments: tty pointer to tty info structure
3406 * filp associated file pointer
3408 * Return Value: 0 if success, otherwise error code
3410 static int mgsl_open(struct tty_struct *tty, struct file * filp)
3412 struct mgsl_struct *info;
3414 unsigned long flags;
3416 /* verify range of specified line number */
3418 if ((line < 0) || (line >= mgsl_device_count)) {
3419 printk("%s(%d):mgsl_open with invalid line #%d.\n",
3420 __FILE__,__LINE__,line);
3424 /* find the info structure for the specified line */
3425 info = mgsl_device_list;
3426 while(info && info->line != line)
3427 info = info->next_device;
3428 if (mgsl_paranoia_check(info, tty->name, "mgsl_open"))
3431 tty->driver_data = info;
3432 info->port.tty = tty;
3434 if (debug_level >= DEBUG_LEVEL_INFO)
3435 printk("%s(%d):mgsl_open(%s), old ref count = %d\n",
3436 __FILE__,__LINE__,tty->driver->name, info->port.count);
3438 /* If port is closing, signal caller to try again */
3439 if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
3440 if (info->port.flags & ASYNC_CLOSING)
3441 interruptible_sleep_on(&info->port.close_wait);
3442 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
3443 -EAGAIN : -ERESTARTSYS);
3447 info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
3449 spin_lock_irqsave(&info->netlock, flags);
3450 if (info->netcount) {
3452 spin_unlock_irqrestore(&info->netlock, flags);
3456 spin_unlock_irqrestore(&info->netlock, flags);
3458 if (info->port.count == 1) {
3459 /* 1st open on this device, init hardware */
3460 retval = startup(info);
3465 retval = block_til_ready(tty, filp, info);
3467 if (debug_level >= DEBUG_LEVEL_INFO)
3468 printk("%s(%d):block_til_ready(%s) returned %d\n",
3469 __FILE__,__LINE__, info->device_name, retval);
3473 if (debug_level >= DEBUG_LEVEL_INFO)
3474 printk("%s(%d):mgsl_open(%s) success\n",
3475 __FILE__,__LINE__, info->device_name);
3480 if (tty->count == 1)
3481 info->port.tty = NULL; /* tty layer will release tty struct */
3482 if(info->port.count)
3488 } /* end of mgsl_open() */
3491 * /proc fs routines....
3494 static inline int line_info(char *buf, struct mgsl_struct *info)
3498 unsigned long flags;
3500 if (info->bus_type == MGSL_BUS_TYPE_PCI) {
3501 ret = sprintf(buf, "%s:PCI io:%04X irq:%d mem:%08X lcr:%08X",
3502 info->device_name, info->io_base, info->irq_level,
3503 info->phys_memory_base, info->phys_lcr_base);
3505 ret = sprintf(buf, "%s:(E)ISA io:%04X irq:%d dma:%d",
3506 info->device_name, info->io_base,
3507 info->irq_level, info->dma_level);
3510 /* output current serial signal states */
3511 spin_lock_irqsave(&info->irq_spinlock,flags);
3512 usc_get_serial_signals(info);
3513 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3517 if (info->serial_signals & SerialSignal_RTS)
3518 strcat(stat_buf, "|RTS");
3519 if (info->serial_signals & SerialSignal_CTS)
3520 strcat(stat_buf, "|CTS");
3521 if (info->serial_signals & SerialSignal_DTR)
3522 strcat(stat_buf, "|DTR");
3523 if (info->serial_signals & SerialSignal_DSR)
3524 strcat(stat_buf, "|DSR");
3525 if (info->serial_signals & SerialSignal_DCD)
3526 strcat(stat_buf, "|CD");
3527 if (info->serial_signals & SerialSignal_RI)
3528 strcat(stat_buf, "|RI");
3530 if (info->params.mode == MGSL_MODE_HDLC ||
3531 info->params.mode == MGSL_MODE_RAW ) {
3532 ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
3533 info->icount.txok, info->icount.rxok);
3534 if (info->icount.txunder)
3535 ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
3536 if (info->icount.txabort)
3537 ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
3538 if (info->icount.rxshort)
3539 ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
3540 if (info->icount.rxlong)
3541 ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
3542 if (info->icount.rxover)
3543 ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
3544 if (info->icount.rxcrc)
3545 ret += sprintf(buf+ret, " rxcrc:%d", info->icount.rxcrc);
3547 ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
3548 info->icount.tx, info->icount.rx);
3549 if (info->icount.frame)
3550 ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
3551 if (info->icount.parity)
3552 ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
3553 if (info->icount.brk)
3554 ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
3555 if (info->icount.overrun)
3556 ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
3559 /* Append serial signal status to end */
3560 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
3562 ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
3563 info->tx_active,info->bh_requested,info->bh_running,
3566 spin_lock_irqsave(&info->irq_spinlock,flags);
3568 u16 Tcsr = usc_InReg( info, TCSR );
3569 u16 Tdmr = usc_InDmaReg( info, TDMR );
3570 u16 Ticr = usc_InReg( info, TICR );
3571 u16 Rscr = usc_InReg( info, RCSR );
3572 u16 Rdmr = usc_InDmaReg( info, RDMR );
3573 u16 Ricr = usc_InReg( info, RICR );
3574 u16 Icr = usc_InReg( info, ICR );
3575 u16 Dccr = usc_InReg( info, DCCR );
3576 u16 Tmr = usc_InReg( info, TMR );
3577 u16 Tccr = usc_InReg( info, TCCR );
3578 u16 Ccar = inw( info->io_base + CCAR );
3579 ret += sprintf(buf+ret, "tcsr=%04X tdmr=%04X ticr=%04X rcsr=%04X rdmr=%04X\n"
3580 "ricr=%04X icr =%04X dccr=%04X tmr=%04X tccr=%04X ccar=%04X\n",
3581 Tcsr,Tdmr,Ticr,Rscr,Rdmr,Ricr,Icr,Dccr,Tmr,Tccr,Ccar );
3583 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3587 } /* end of line_info() */
3591 * Called to print information about devices
3594 * page page of memory to hold returned info
3603 static int mgsl_read_proc(char *page, char **start, off_t off, int count,
3604 int *eof, void *data)
3608 struct mgsl_struct *info;
3610 len += sprintf(page, "synclink driver:%s\n", driver_version);
3612 info = mgsl_device_list;
3614 l = line_info(page + len, info);
3616 if (len+begin > off+count)
3618 if (len+begin < off) {
3622 info = info->next_device;
3627 if (off >= len+begin)
3629 *start = page + (off-begin);
3630 return ((count < begin+len-off) ? count : begin+len-off);
3632 } /* end of mgsl_read_proc() */
3634 /* mgsl_allocate_dma_buffers()
3636 * Allocate and format DMA buffers (ISA adapter)
3637 * or format shared memory buffers (PCI adapter).
3639 * Arguments: info pointer to device instance data
3640 * Return Value: 0 if success, otherwise error
3642 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info)
3644 unsigned short BuffersPerFrame;
3646 info->last_mem_alloc = 0;
3648 /* Calculate the number of DMA buffers necessary to hold the */
3649 /* largest allowable frame size. Note: If the max frame size is */
3650 /* not an even multiple of the DMA buffer size then we need to */
3651 /* round the buffer count per frame up one. */
3653 BuffersPerFrame = (unsigned short)(info->max_frame_size/DMABUFFERSIZE);
3654 if ( info->max_frame_size % DMABUFFERSIZE )
3657 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3659 * The PCI adapter has 256KBytes of shared memory to use.
3660 * This is 64 PAGE_SIZE buffers.
3662 * The first page is used for padding at this time so the
3663 * buffer list does not begin at offset 0 of the PCI
3664 * adapter's shared memory.
3666 * The 2nd page is used for the buffer list. A 4K buffer
3667 * list can hold 128 DMA_BUFFER structures at 32 bytes
3670 * This leaves 62 4K pages.
3672 * The next N pages are used for transmit frame(s). We
3673 * reserve enough 4K page blocks to hold the required
3674 * number of transmit dma buffers (num_tx_dma_buffers),
3675 * each of MaxFrameSize size.
3677 * Of the remaining pages (62-N), determine how many can
3678 * be used to receive full MaxFrameSize inbound frames
3680 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3681 info->rx_buffer_count = 62 - info->tx_buffer_count;
3683 /* Calculate the number of PAGE_SIZE buffers needed for */
3684 /* receive and transmit DMA buffers. */
3687 /* Calculate the number of DMA buffers necessary to */
3688 /* hold 7 max size receive frames and one max size transmit frame. */
3689 /* The receive buffer count is bumped by one so we avoid an */
3690 /* End of List condition if all receive buffers are used when */
3691 /* using linked list DMA buffers. */
3693 info->tx_buffer_count = info->num_tx_dma_buffers * BuffersPerFrame;
3694 info->rx_buffer_count = (BuffersPerFrame * MAXRXFRAMES) + 6;
3697 * limit total TxBuffers & RxBuffers to 62 4K total
3698 * (ala PCI Allocation)
3701 if ( (info->tx_buffer_count + info->rx_buffer_count) > 62 )
3702 info->rx_buffer_count = 62 - info->tx_buffer_count;
3706 if ( debug_level >= DEBUG_LEVEL_INFO )
3707 printk("%s(%d):Allocating %d TX and %d RX DMA buffers.\n",
3708 __FILE__,__LINE__, info->tx_buffer_count,info->rx_buffer_count);
3710 if ( mgsl_alloc_buffer_list_memory( info ) < 0 ||
3711 mgsl_alloc_frame_memory(info, info->rx_buffer_list, info->rx_buffer_count) < 0 ||
3712 mgsl_alloc_frame_memory(info, info->tx_buffer_list, info->tx_buffer_count) < 0 ||
3713 mgsl_alloc_intermediate_rxbuffer_memory(info) < 0 ||
3714 mgsl_alloc_intermediate_txbuffer_memory(info) < 0 ) {
3715 printk("%s(%d):Can't allocate DMA buffer memory\n",__FILE__,__LINE__);
3719 mgsl_reset_rx_dma_buffers( info );
3720 mgsl_reset_tx_dma_buffers( info );
3724 } /* end of mgsl_allocate_dma_buffers() */
3727 * mgsl_alloc_buffer_list_memory()
3729 * Allocate a common DMA buffer for use as the
3730 * receive and transmit buffer lists.
3732 * A buffer list is a set of buffer entries where each entry contains
3733 * a pointer to an actual buffer and a pointer to the next buffer entry
3734 * (plus some other info about the buffer).
3736 * The buffer entries for a list are built to form a circular list so
3737 * that when the entire list has been traversed you start back at the
3740 * This function allocates memory for just the buffer entries.
3741 * The links (pointer to next entry) are filled in with the physical
3742 * address of the next entry so the adapter can navigate the list
3743 * using bus master DMA. The pointers to the actual buffers are filled
3744 * out later when the actual buffers are allocated.
3746 * Arguments: info pointer to device instance data
3747 * Return Value: 0 if success, otherwise error
3749 static int mgsl_alloc_buffer_list_memory( struct mgsl_struct *info )
3753 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3754 /* PCI adapter uses shared memory. */
3755 info->buffer_list = info->memory_base + info->last_mem_alloc;
3756 info->buffer_list_phys = info->last_mem_alloc;
3757 info->last_mem_alloc += BUFFERLISTSIZE;
3759 /* ISA adapter uses system memory. */
3760 /* The buffer lists are allocated as a common buffer that both */
3761 /* the processor and adapter can access. This allows the driver to */
3762 /* inspect portions of the buffer while other portions are being */
3763 /* updated by the adapter using Bus Master DMA. */
3765 info->buffer_list = dma_alloc_coherent(NULL, BUFFERLISTSIZE, &info->buffer_list_dma_addr, GFP_KERNEL);
3766 if (info->buffer_list == NULL)
3768 info->buffer_list_phys = (u32)(info->buffer_list_dma_addr);
3771 /* We got the memory for the buffer entry lists. */
3772 /* Initialize the memory block to all zeros. */
3773 memset( info->buffer_list, 0, BUFFERLISTSIZE );
3775 /* Save virtual address pointers to the receive and */
3776 /* transmit buffer lists. (Receive 1st). These pointers will */
3777 /* be used by the processor to access the lists. */
3778 info->rx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3779 info->tx_buffer_list = (DMABUFFERENTRY *)info->buffer_list;
3780 info->tx_buffer_list += info->rx_buffer_count;
3783 * Build the links for the buffer entry lists such that
3784 * two circular lists are built. (Transmit and Receive).
3786 * Note: the links are physical addresses
3787 * which are read by the adapter to determine the next
3788 * buffer entry to use.
3791 for ( i = 0; i < info->rx_buffer_count; i++ ) {
3792 /* calculate and store physical address of this buffer entry */
3793 info->rx_buffer_list[i].phys_entry =
3794 info->buffer_list_phys + (i * sizeof(DMABUFFERENTRY));
3796 /* calculate and store physical address of */
3797 /* next entry in cirular list of entries */
3799 info->rx_buffer_list[i].link = info->buffer_list_phys;
3801 if ( i < info->rx_buffer_count - 1 )
3802 info->rx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3805 for ( i = 0; i < info->tx_buffer_count; i++ ) {
3806 /* calculate and store physical address of this buffer entry */
3807 info->tx_buffer_list[i].phys_entry = info->buffer_list_phys +
3808 ((info->rx_buffer_count + i) * sizeof(DMABUFFERENTRY));
3810 /* calculate and store physical address of */
3811 /* next entry in cirular list of entries */
3813 info->tx_buffer_list[i].link = info->buffer_list_phys +
3814 info->rx_buffer_count * sizeof(DMABUFFERENTRY);
3816 if ( i < info->tx_buffer_count - 1 )
3817 info->tx_buffer_list[i].link += (i + 1) * sizeof(DMABUFFERENTRY);
3822 } /* end of mgsl_alloc_buffer_list_memory() */
3824 /* Free DMA buffers allocated for use as the
3825 * receive and transmit buffer lists.
3828 * The data transfer buffers associated with the buffer list
3829 * MUST be freed before freeing the buffer list itself because
3830 * the buffer list contains the information necessary to free
3831 * the individual buffers!
3833 static void mgsl_free_buffer_list_memory( struct mgsl_struct *info )
3835 if (info->buffer_list && info->bus_type != MGSL_BUS_TYPE_PCI)
3836 dma_free_coherent(NULL, BUFFERLISTSIZE, info->buffer_list, info->buffer_list_dma_addr);
3838 info->buffer_list = NULL;
3839 info->rx_buffer_list = NULL;
3840 info->tx_buffer_list = NULL;
3842 } /* end of mgsl_free_buffer_list_memory() */
3845 * mgsl_alloc_frame_memory()
3847 * Allocate the frame DMA buffers used by the specified buffer list.
3848 * Each DMA buffer will be one memory page in size. This is necessary
3849 * because memory can fragment enough that it may be impossible
3854 * info pointer to device instance data
3855 * BufferList pointer to list of buffer entries
3856 * Buffercount count of buffer entries in buffer list
3858 * Return Value: 0 if success, otherwise -ENOMEM
3860 static int mgsl_alloc_frame_memory(struct mgsl_struct *info,DMABUFFERENTRY *BufferList,int Buffercount)
3865 /* Allocate page sized buffers for the receive buffer list */
3867 for ( i = 0; i < Buffercount; i++ ) {
3868 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
3869 /* PCI adapter uses shared memory buffers. */
3870 BufferList[i].virt_addr = info->memory_base + info->last_mem_alloc;
3871 phys_addr = info->last_mem_alloc;
3872 info->last_mem_alloc += DMABUFFERSIZE;
3874 /* ISA adapter uses system memory. */
3875 BufferList[i].virt_addr = dma_alloc_coherent(NULL, DMABUFFERSIZE, &BufferList[i].dma_addr, GFP_KERNEL);
3876 if (BufferList[i].virt_addr == NULL)
3878 phys_addr = (u32)(BufferList[i].dma_addr);
3880 BufferList[i].phys_addr = phys_addr;
3885 } /* end of mgsl_alloc_frame_memory() */
3888 * mgsl_free_frame_memory()
3890 * Free the buffers associated with
3891 * each buffer entry of a buffer list.
3895 * info pointer to device instance data
3896 * BufferList pointer to list of buffer entries
3897 * Buffercount count of buffer entries in buffer list
3899 * Return Value: None
3901 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList, int Buffercount)
3906 for ( i = 0 ; i < Buffercount ; i++ ) {
3907 if ( BufferList[i].virt_addr ) {
3908 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
3909 dma_free_coherent(NULL, DMABUFFERSIZE, BufferList[i].virt_addr, BufferList[i].dma_addr);
3910 BufferList[i].virt_addr = NULL;
3915 } /* end of mgsl_free_frame_memory() */
3917 /* mgsl_free_dma_buffers()
3921 * Arguments: info pointer to device instance data
3922 * Return Value: None
3924 static void mgsl_free_dma_buffers( struct mgsl_struct *info )
3926 mgsl_free_frame_memory( info, info->rx_buffer_list, info->rx_buffer_count );
3927 mgsl_free_frame_memory( info, info->tx_buffer_list, info->tx_buffer_count );
3928 mgsl_free_buffer_list_memory( info );
3930 } /* end of mgsl_free_dma_buffers() */
3934 * mgsl_alloc_intermediate_rxbuffer_memory()
3936 * Allocate a buffer large enough to hold max_frame_size. This buffer
3937 * is used to pass an assembled frame to the line discipline.
3941 * info pointer to device instance data
3943 * Return Value: 0 if success, otherwise -ENOMEM
3945 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3947 info->intermediate_rxbuffer = kmalloc(info->max_frame_size, GFP_KERNEL | GFP_DMA);
3948 if ( info->intermediate_rxbuffer == NULL )
3953 } /* end of mgsl_alloc_intermediate_rxbuffer_memory() */
3956 * mgsl_free_intermediate_rxbuffer_memory()
3961 * info pointer to device instance data
3963 * Return Value: None
3965 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info)
3967 kfree(info->intermediate_rxbuffer);
3968 info->intermediate_rxbuffer = NULL;
3970 } /* end of mgsl_free_intermediate_rxbuffer_memory() */
3973 * mgsl_alloc_intermediate_txbuffer_memory()
3975 * Allocate intermdiate transmit buffer(s) large enough to hold max_frame_size.
3976 * This buffer is used to load transmit frames into the adapter's dma transfer
3977 * buffers when there is sufficient space.
3981 * info pointer to device instance data
3983 * Return Value: 0 if success, otherwise -ENOMEM
3985 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info)
3989 if ( debug_level >= DEBUG_LEVEL_INFO )
3990 printk("%s %s(%d) allocating %d tx holding buffers\n",
3991 info->device_name, __FILE__,__LINE__,info->num_tx_holding_buffers);
3993 memset(info->tx_holding_buffers,0,sizeof(info->tx_holding_buffers));
3995 for ( i=0; i<info->num_tx_holding_buffers; ++i) {
3996 info->tx_holding_buffers[i].buffer =
3997 kmalloc(info->max_frame_size, GFP_KERNEL);
3998 if (info->tx_holding_buffers[i].buffer == NULL) {
3999 for (--i; i >= 0; i--) {
4000 kfree(info->tx_holding_buffers[i].buffer);
4001 info->tx_holding_buffers[i].buffer = NULL;
4009 } /* end of mgsl_alloc_intermediate_txbuffer_memory() */
4012 * mgsl_free_intermediate_txbuffer_memory()
4017 * info pointer to device instance data
4019 * Return Value: None
4021 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info)
4025 for ( i=0; i<info->num_tx_holding_buffers; ++i ) {
4026 kfree(info->tx_holding_buffers[i].buffer);
4027 info->tx_holding_buffers[i].buffer = NULL;
4030 info->get_tx_holding_index = 0;
4031 info->put_tx_holding_index = 0;
4032 info->tx_holding_count = 0;
4034 } /* end of mgsl_free_intermediate_txbuffer_memory() */
4038 * load_next_tx_holding_buffer()
4040 * attempts to load the next buffered tx request into the
4045 * info pointer to device instance data
4047 * Return Value: true if next buffered tx request loaded
4048 * into adapter's tx dma buffer,
4051 static bool load_next_tx_holding_buffer(struct mgsl_struct *info)
4055 if ( info->tx_holding_count ) {
4056 /* determine if we have enough tx dma buffers
4057 * to accommodate the next tx frame
4059 struct tx_holding_buffer *ptx =
4060 &info->tx_holding_buffers[info->get_tx_holding_index];
4061 int num_free = num_free_tx_dma_buffers(info);
4062 int num_needed = ptx->buffer_size / DMABUFFERSIZE;
4063 if ( ptx->buffer_size % DMABUFFERSIZE )
4066 if (num_needed <= num_free) {
4067 info->xmit_cnt = ptx->buffer_size;
4068 mgsl_load_tx_dma_buffer(info,ptx->buffer,ptx->buffer_size);
4070 --info->tx_holding_count;
4071 if ( ++info->get_tx_holding_index >= info->num_tx_holding_buffers)
4072 info->get_tx_holding_index=0;
4074 /* restart transmit timer */
4075 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(5000));
4085 * save_tx_buffer_request()
4087 * attempt to store transmit frame request for later transmission
4091 * info pointer to device instance data
4092 * Buffer pointer to buffer containing frame to load
4093 * BufferSize size in bytes of frame in Buffer
4095 * Return Value: 1 if able to store, 0 otherwise
4097 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize)
4099 struct tx_holding_buffer *ptx;
4101 if ( info->tx_holding_count >= info->num_tx_holding_buffers ) {
4102 return 0; /* all buffers in use */
4105 ptx = &info->tx_holding_buffers[info->put_tx_holding_index];
4106 ptx->buffer_size = BufferSize;
4107 memcpy( ptx->buffer, Buffer, BufferSize);
4109 ++info->tx_holding_count;
4110 if ( ++info->put_tx_holding_index >= info->num_tx_holding_buffers)
4111 info->put_tx_holding_index=0;
4116 static int mgsl_claim_resources(struct mgsl_struct *info)
4118 if (request_region(info->io_base,info->io_addr_size,"synclink") == NULL) {
4119 printk( "%s(%d):I/O address conflict on device %s Addr=%08X\n",
4120 __FILE__,__LINE__,info->device_name, info->io_base);
4123 info->io_addr_requested = true;
4125 if ( request_irq(info->irq_level,mgsl_interrupt,info->irq_flags,
4126 info->device_name, info ) < 0 ) {
4127 printk( "%s(%d):Cant request interrupt on device %s IRQ=%d\n",
4128 __FILE__,__LINE__,info->device_name, info->irq_level );
4131 info->irq_requested = true;
4133 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4134 if (request_mem_region(info->phys_memory_base,0x40000,"synclink") == NULL) {
4135 printk( "%s(%d):mem addr conflict device %s Addr=%08X\n",
4136 __FILE__,__LINE__,info->device_name, info->phys_memory_base);
4139 info->shared_mem_requested = true;
4140 if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclink") == NULL) {
4141 printk( "%s(%d):lcr mem addr conflict device %s Addr=%08X\n",
4142 __FILE__,__LINE__,info->device_name, info->phys_lcr_base + info->lcr_offset);
4145 info->lcr_mem_requested = true;
4147 info->memory_base = ioremap_nocache(info->phys_memory_base,
4149 if (!info->memory_base) {
4150 printk( "%s(%d):Cant map shared memory on device %s MemAddr=%08X\n",
4151 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4155 if ( !mgsl_memory_test(info) ) {
4156 printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
4157 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4161 info->lcr_base = ioremap_nocache(info->phys_lcr_base,
4163 if (!info->lcr_base) {
4164 printk( "%s(%d):Cant map LCR memory on device %s MemAddr=%08X\n",
4165 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
4168 info->lcr_base += info->lcr_offset;
4171 /* claim DMA channel */
4173 if (request_dma(info->dma_level,info->device_name) < 0){
4174 printk( "%s(%d):Cant request DMA channel on device %s DMA=%d\n",
4175 __FILE__,__LINE__,info->device_name, info->dma_level );
4176 mgsl_release_resources( info );
4179 info->dma_requested = true;
4181 /* ISA adapter uses bus master DMA */
4182 set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
4183 enable_dma(info->dma_level);
4186 if ( mgsl_allocate_dma_buffers(info) < 0 ) {
4187 printk( "%s(%d):Cant allocate DMA buffers on device %s DMA=%d\n",
4188 __FILE__,__LINE__,info->device_name, info->dma_level );
4194 mgsl_release_resources(info);
4197 } /* end of mgsl_claim_resources() */
4199 static void mgsl_release_resources(struct mgsl_struct *info)
4201 if ( debug_level >= DEBUG_LEVEL_INFO )
4202 printk( "%s(%d):mgsl_release_resources(%s) entry\n",
4203 __FILE__,__LINE__,info->device_name );
4205 if ( info->irq_requested ) {
4206 free_irq(info->irq_level, info);
4207 info->irq_requested = false;
4209 if ( info->dma_requested ) {
4210 disable_dma(info->dma_level);
4211 free_dma(info->dma_level);
4212 info->dma_requested = false;
4214 mgsl_free_dma_buffers(info);
4215 mgsl_free_intermediate_rxbuffer_memory(info);
4216 mgsl_free_intermediate_txbuffer_memory(info);
4218 if ( info->io_addr_requested ) {
4219 release_region(info->io_base,info->io_addr_size);
4220 info->io_addr_requested = false;
4222 if ( info->shared_mem_requested ) {
4223 release_mem_region(info->phys_memory_base,0x40000);
4224 info->shared_mem_requested = false;
4226 if ( info->lcr_mem_requested ) {
4227 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
4228 info->lcr_mem_requested = false;
4230 if (info->memory_base){
4231 iounmap(info->memory_base);
4232 info->memory_base = NULL;
4234 if (info->lcr_base){
4235 iounmap(info->lcr_base - info->lcr_offset);
4236 info->lcr_base = NULL;
4239 if ( debug_level >= DEBUG_LEVEL_INFO )
4240 printk( "%s(%d):mgsl_release_resources(%s) exit\n",
4241 __FILE__,__LINE__,info->device_name );
4243 } /* end of mgsl_release_resources() */
4245 /* mgsl_add_device()
4247 * Add the specified device instance data structure to the
4248 * global linked list of devices and increment the device count.
4250 * Arguments: info pointer to device instance data
4251 * Return Value: None
4253 static void mgsl_add_device( struct mgsl_struct *info )
4255 info->next_device = NULL;
4256 info->line = mgsl_device_count;
4257 sprintf(info->device_name,"ttySL%d",info->line);
4259 if (info->line < MAX_TOTAL_DEVICES) {
4260 if (maxframe[info->line])
4261 info->max_frame_size = maxframe[info->line];
4262 info->dosyncppp = dosyncppp[info->line];
4264 if (txdmabufs[info->line]) {
4265 info->num_tx_dma_buffers = txdmabufs[info->line];
4266 if (info->num_tx_dma_buffers < 1)
4267 info->num_tx_dma_buffers = 1;
4270 if (txholdbufs[info->line]) {
4271 info->num_tx_holding_buffers = txholdbufs[info->line];
4272 if (info->num_tx_holding_buffers < 1)
4273 info->num_tx_holding_buffers = 1;
4274 else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
4275 info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
4279 mgsl_device_count++;
4281 if ( !mgsl_device_list )
4282 mgsl_device_list = info;
4284 struct mgsl_struct *current_dev = mgsl_device_list;
4285 while( current_dev->next_device )
4286 current_dev = current_dev->next_device;
4287 current_dev->next_device = info;
4290 if ( info->max_frame_size < 4096 )
4291 info->max_frame_size = 4096;
4292 else if ( info->max_frame_size > 65535 )
4293 info->max_frame_size = 65535;
4295 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4296 printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
4297 info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
4298 info->phys_memory_base, info->phys_lcr_base,
4299 info->max_frame_size );
4301 printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
4302 info->device_name, info->io_base, info->irq_level, info->dma_level,
4303 info->max_frame_size );
4306 #if SYNCLINK_GENERIC_HDLC
4310 } /* end of mgsl_add_device() */
4312 /* mgsl_allocate_device()
4314 * Allocate and initialize a device instance structure
4317 * Return Value: pointer to mgsl_struct if success, otherwise NULL
4319 static struct mgsl_struct* mgsl_allocate_device(void)
4321 struct mgsl_struct *info;
4323 info = kzalloc(sizeof(struct mgsl_struct),
4327 printk("Error can't allocate device instance data\n");
4329 info->magic = MGSL_MAGIC;
4330 INIT_WORK(&info->task, mgsl_bh_handler);
4331 info->max_frame_size = 4096;
4332 info->close_delay = 5*HZ/10;
4333 info->closing_wait = 30*HZ;
4334 tty_port_init(&info->port);
4335 init_waitqueue_head(&info->status_event_wait_q);
4336 init_waitqueue_head(&info->event_wait_q);
4337 spin_lock_init(&info->irq_spinlock);
4338 spin_lock_init(&info->netlock);
4339 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
4340 info->idle_mode = HDLC_TXIDLE_FLAGS;
4341 info->num_tx_dma_buffers = 1;
4342 info->num_tx_holding_buffers = 0;
4347 } /* end of mgsl_allocate_device()*/
4349 static const struct tty_operations mgsl_ops = {
4351 .close = mgsl_close,
4352 .write = mgsl_write,
4353 .put_char = mgsl_put_char,
4354 .flush_chars = mgsl_flush_chars,
4355 .write_room = mgsl_write_room,
4356 .chars_in_buffer = mgsl_chars_in_buffer,
4357 .flush_buffer = mgsl_flush_buffer,
4358 .ioctl = mgsl_ioctl,
4359 .throttle = mgsl_throttle,
4360 .unthrottle = mgsl_unthrottle,
4361 .send_xchar = mgsl_send_xchar,
4362 .break_ctl = mgsl_break,
4363 .wait_until_sent = mgsl_wait_until_sent,
4364 .read_proc = mgsl_read_proc,
4365 .set_termios = mgsl_set_termios,
4367 .start = mgsl_start,
4368 .hangup = mgsl_hangup,
4369 .tiocmget = tiocmget,
4370 .tiocmset = tiocmset,
4374 * perform tty device initialization
4376 static int mgsl_init_tty(void)
4380 serial_driver = alloc_tty_driver(128);
4384 serial_driver->owner = THIS_MODULE;
4385 serial_driver->driver_name = "synclink";
4386 serial_driver->name = "ttySL";
4387 serial_driver->major = ttymajor;
4388 serial_driver->minor_start = 64;
4389 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4390 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4391 serial_driver->init_termios = tty_std_termios;
4392 serial_driver->init_termios.c_cflag =
4393 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4394 serial_driver->init_termios.c_ispeed = 9600;
4395 serial_driver->init_termios.c_ospeed = 9600;
4396 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4397 tty_set_operations(serial_driver, &mgsl_ops);
4398 if ((rc = tty_register_driver(serial_driver)) < 0) {
4399 printk("%s(%d):Couldn't register serial driver\n",
4401 put_tty_driver(serial_driver);
4402 serial_driver = NULL;
4406 printk("%s %s, tty major#%d\n",
4407 driver_name, driver_version,
4408 serial_driver->major);
4412 /* enumerate user specified ISA adapters
4414 static void mgsl_enum_isa_devices(void)
4416 struct mgsl_struct *info;
4419 /* Check for user specified ISA devices */
4421 for (i=0 ;(i < MAX_ISA_DEVICES) && io[i] && irq[i]; i++){
4422 if ( debug_level >= DEBUG_LEVEL_INFO )
4423 printk("ISA device specified io=%04X,irq=%d,dma=%d\n",
4424 io[i], irq[i], dma[i] );
4426 info = mgsl_allocate_device();
4428 /* error allocating device instance data */
4429 if ( debug_level >= DEBUG_LEVEL_ERROR )
4430 printk( "can't allocate device instance data.\n");
4434 /* Copy user configuration info to device instance data */
4435 info->io_base = (unsigned int)io[i];
4436 info->irq_level = (unsigned int)irq[i];
4437 info->irq_level = irq_canonicalize(info->irq_level);
4438 info->dma_level = (unsigned int)dma[i];
4439 info->bus_type = MGSL_BUS_TYPE_ISA;
4440 info->io_addr_size = 16;
4441 info->irq_flags = 0;
4443 mgsl_add_device( info );
4447 static void synclink_cleanup(void)
4450 struct mgsl_struct *info;
4451 struct mgsl_struct *tmp;
4453 printk("Unloading %s: %s\n", driver_name, driver_version);
4455 if (serial_driver) {
4456 if ((rc = tty_unregister_driver(serial_driver)))
4457 printk("%s(%d) failed to unregister tty driver err=%d\n",
4458 __FILE__,__LINE__,rc);
4459 put_tty_driver(serial_driver);
4462 info = mgsl_device_list;
4464 #if SYNCLINK_GENERIC_HDLC
4467 mgsl_release_resources(info);
4469 info = info->next_device;
4474 pci_unregister_driver(&synclink_pci_driver);
4477 static int __init synclink_init(void)
4481 if (break_on_load) {
4482 mgsl_get_text_ptr();
4486 printk("%s %s\n", driver_name, driver_version);
4488 mgsl_enum_isa_devices();
4489 if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
4490 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4492 pci_registered = true;
4494 if ((rc = mgsl_init_tty()) < 0)
4504 static void __exit synclink_exit(void)
4509 module_init(synclink_init);
4510 module_exit(synclink_exit);
4515 * Issue a USC Receive/Transmit command to the
4516 * Channel Command/Address Register (CCAR).
4520 * The command is encoded in the most significant 5 bits <15..11>
4521 * of the CCAR value. Bits <10..7> of the CCAR must be preserved
4522 * and Bits <6..0> must be written as zeros.
4526 * info pointer to device information structure
4527 * Cmd command mask (use symbolic macros)
4533 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
4535 /* output command to CCAR in bits <15..11> */
4536 /* preserve bits <10..7>, bits <6..0> must be zero */
4538 outw( Cmd + info->loopback_bits, info->io_base + CCAR );
4540 /* Read to flush write to CCAR */
4541 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4542 inw( info->io_base + CCAR );
4544 } /* end of usc_RTCmd() */
4549 * Issue a DMA command to the DMA Command/Address Register (DCAR).
4553 * info pointer to device information structure
4554 * Cmd DMA command mask (usc_DmaCmd_XX Macros)
4560 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
4562 /* write command mask to DCAR */
4563 outw( Cmd + info->mbre_bit, info->io_base );
4565 /* Read to flush write to DCAR */
4566 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4567 inw( info->io_base );
4569 } /* end of usc_DmaCmd() */
4574 * Write a 16-bit value to a USC DMA register
4578 * info pointer to device info structure
4579 * RegAddr register address (number) for write
4580 * RegValue 16-bit value to write to register
4587 static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4589 /* Note: The DCAR is located at the adapter base address */
4590 /* Note: must preserve state of BIT8 in DCAR */
4592 outw( RegAddr + info->mbre_bit, info->io_base );
4593 outw( RegValue, info->io_base );
4595 /* Read to flush write to DCAR */
4596 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4597 inw( info->io_base );
4599 } /* end of usc_OutDmaReg() */
4604 * Read a 16-bit value from a DMA register
4608 * info pointer to device info structure
4609 * RegAddr register address (number) to read from
4613 * The 16-bit value read from register
4616 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
4618 /* Note: The DCAR is located at the adapter base address */
4619 /* Note: must preserve state of BIT8 in DCAR */
4621 outw( RegAddr + info->mbre_bit, info->io_base );
4622 return inw( info->io_base );
4624 } /* end of usc_InDmaReg() */
4630 * Write a 16-bit value to a USC serial channel register
4634 * info pointer to device info structure
4635 * RegAddr register address (number) to write to
4636 * RegValue 16-bit value to write to register
4643 static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4645 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4646 outw( RegValue, info->io_base + CCAR );
4648 /* Read to flush write to CCAR */
4649 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4650 inw( info->io_base + CCAR );
4652 } /* end of usc_OutReg() */
4657 * Reads a 16-bit value from a USC serial channel register
4661 * info pointer to device extension
4662 * RegAddr register address (number) to read from
4666 * 16-bit value read from register
4668 static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
4670 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4671 return inw( info->io_base + CCAR );
4673 } /* end of usc_InReg() */
4675 /* usc_set_sdlc_mode()
4677 * Set up the adapter for SDLC DMA communications.
4679 * Arguments: info pointer to device instance data
4680 * Return Value: NONE
4682 static void usc_set_sdlc_mode( struct mgsl_struct *info )
4688 * determine if the IUSC on the adapter is pre-SL1660. If
4689 * not, take advantage of the UnderWait feature of more
4690 * modern chips. If an underrun occurs and this bit is set,
4691 * the transmitter will idle the programmed idle pattern
4692 * until the driver has time to service the underrun. Otherwise,
4693 * the dma controller may get the cycles previously requested
4694 * and begin transmitting queued tx data.
4696 usc_OutReg(info,TMCR,0x1f);
4697 RegValue=usc_InReg(info,TMDR);
4698 PreSL1660 = (RegValue == IUSC_PRE_SL1660);
4700 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
4703 ** Channel Mode Register (CMR)
4705 ** <15..14> 10 Tx Sub Modes, Send Flag on Underrun
4706 ** <13> 0 0 = Transmit Disabled (initially)
4707 ** <12> 0 1 = Consecutive Idles share common 0
4708 ** <11..8> 1110 Transmitter Mode = HDLC/SDLC Loop
4709 ** <7..4> 0000 Rx Sub Modes, addr/ctrl field handling
4710 ** <3..0> 0110 Receiver Mode = HDLC/SDLC
4712 ** 1000 1110 0000 0110 = 0x8e06
4716 /*--------------------------------------------------
4717 * ignore user options for UnderRun Actions and
4719 *--------------------------------------------------*/
4723 /* Channel mode Register (CMR)
4725 * <15..14> 00 Tx Sub modes, Underrun Action
4726 * <13> 0 1 = Send Preamble before opening flag
4727 * <12> 0 1 = Consecutive Idles share common 0
4728 * <11..8> 0110 Transmitter mode = HDLC/SDLC
4729 * <7..4> 0000 Rx Sub modes, addr/ctrl field handling
4730 * <3..0> 0110 Receiver mode = HDLC/SDLC
4732 * 0000 0110 0000 0110 = 0x0606
4734 if (info->params.mode == MGSL_MODE_RAW) {
4735 RegValue = 0x0001; /* Set Receive mode = external sync */
4737 usc_OutReg( info, IOCR, /* Set IOCR DCD is RxSync Detect Input */
4738 (unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
4742 * CMR <15> 0 Don't send CRC on Tx Underrun
4743 * CMR <14> x undefined
4744 * CMR <13> 0 Send preamble before openning sync
4745 * CMR <12> 0 Send 8-bit syncs, 1=send Syncs per TxLength
4748 * CMR <11-8) 0100 MonoSync
4750 * 0x00 0100 xxxx xxxx 04xx
4758 if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
4760 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
4762 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
4763 RegValue |= BIT15 + BIT14;
4766 if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
4770 if ( info->params.mode == MGSL_MODE_HDLC &&
4771 (info->params.flags & HDLC_FLAG_SHARE_ZERO) )
4774 if ( info->params.addr_filter != 0xff )
4776 /* set up receive address filtering */
4777 usc_OutReg( info, RSR, info->params.addr_filter );
4781 usc_OutReg( info, CMR, RegValue );
4782 info->cmr_value = RegValue;
4784 /* Receiver mode Register (RMR)
4786 * <15..13> 000 encoding
4787 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4788 * <10> 1 1 = Set CRC to all 1s (use for SDLC/HDLC)
4789 * <9> 0 1 = Include Receive chars in CRC
4790 * <8> 1 1 = Use Abort/PE bit as abort indicator
4791 * <7..6> 00 Even parity
4792 * <5> 0 parity disabled
4793 * <4..2> 000 Receive Char Length = 8 bits
4794 * <1..0> 00 Disable Receiver
4796 * 0000 0101 0000 0000 = 0x0500
4801 switch ( info->params.encoding ) {
4802 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4803 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4804 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4805 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4806 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4807 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4808 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4811 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4813 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4814 RegValue |= ( BIT12 | BIT10 | BIT9 );
4816 usc_OutReg( info, RMR, RegValue );
4818 /* Set the Receive count Limit Register (RCLR) to 0xffff. */
4819 /* When an opening flag of an SDLC frame is recognized the */
4820 /* Receive Character count (RCC) is loaded with the value in */
4821 /* RCLR. The RCC is decremented for each received byte. The */
4822 /* value of RCC is stored after the closing flag of the frame */
4823 /* allowing the frame size to be computed. */
4825 usc_OutReg( info, RCLR, RCLRVALUE );
4827 usc_RCmd( info, RCmd_SelectRicrdma_level );
4829 /* Receive Interrupt Control Register (RICR)
4831 * <15..8> ? RxFIFO DMA Request Level
4832 * <7> 0 Exited Hunt IA (Interrupt Arm)
4833 * <6> 0 Idle Received IA
4834 * <5> 0 Break/Abort IA
4836 * <3> 1 Queued status reflects oldest 2 bytes in FIFO
4838 * <1> 1 Rx Overrun IA
4839 * <0> 0 Select TC0 value for readback
4841 * 0000 0000 0000 1000 = 0x000a
4844 /* Carry over the Exit Hunt and Idle Received bits */
4845 /* in case they have been armed by usc_ArmEvents. */
4847 RegValue = usc_InReg( info, RICR ) & 0xc0;
4849 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4850 usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
4852 usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
4854 /* Unlatch all Rx status bits and clear Rx status IRQ Pending */
4856 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
4857 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
4859 /* Transmit mode Register (TMR)
4861 * <15..13> 000 encoding
4862 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4863 * <10> 1 1 = Start CRC as all 1s (use for SDLC/HDLC)
4864 * <9> 0 1 = Tx CRC Enabled
4865 * <8> 0 1 = Append CRC to end of transmit frame
4866 * <7..6> 00 Transmit parity Even
4867 * <5> 0 Transmit parity Disabled
4868 * <4..2> 000 Tx Char Length = 8 bits
4869 * <1..0> 00 Disable Transmitter
4871 * 0000 0100 0000 0000 = 0x0400
4876 switch ( info->params.encoding ) {
4877 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4878 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4879 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4880 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4881 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4882 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4883 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4886 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4887 RegValue |= BIT9 + BIT8;
4888 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4889 RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
4891 usc_OutReg( info, TMR, RegValue );
4893 usc_set_txidle( info );
4896 usc_TCmd( info, TCmd_SelectTicrdma_level );
4898 /* Transmit Interrupt Control Register (TICR)
4900 * <15..8> ? Transmit FIFO DMA Level
4901 * <7> 0 Present IA (Interrupt Arm)
4902 * <6> 0 Idle Sent IA
4903 * <5> 1 Abort Sent IA
4904 * <4> 1 EOF/EOM Sent IA
4906 * <2> 1 1 = Wait for SW Trigger to Start Frame
4907 * <1> 1 Tx Underrun IA
4908 * <0> 0 TC0 constant on read back
4910 * 0000 0000 0011 0110 = 0x0036
4913 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4914 usc_OutReg( info, TICR, 0x0736 );
4916 usc_OutReg( info, TICR, 0x1436 );
4918 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
4919 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
4922 ** Transmit Command/Status Register (TCSR)
4924 ** <15..12> 0000 TCmd
4925 ** <11> 0/1 UnderWait
4926 ** <10..08> 000 TxIdle
4930 ** <4> x EOF/EOM Sent
4936 ** 0000 0000 0000 0000 = 0x0000
4938 info->tcsr_value = 0;
4941 info->tcsr_value |= TCSR_UNDERWAIT;
4943 usc_OutReg( info, TCSR, info->tcsr_value );
4945 /* Clock mode Control Register (CMCR)
4947 * <15..14> 00 counter 1 Source = Disabled
4948 * <13..12> 00 counter 0 Source = Disabled
4949 * <11..10> 11 BRG1 Input is TxC Pin
4950 * <9..8> 11 BRG0 Input is TxC Pin
4951 * <7..6> 01 DPLL Input is BRG1 Output
4952 * <5..3> XXX TxCLK comes from Port 0
4953 * <2..0> XXX RxCLK comes from Port 1
4955 * 0000 1111 0111 0111 = 0x0f77
4960 if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
4961 RegValue |= 0x0003; /* RxCLK from DPLL */
4962 else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
4963 RegValue |= 0x0004; /* RxCLK from BRG0 */
4964 else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4965 RegValue |= 0x0006; /* RxCLK from TXC Input */
4967 RegValue |= 0x0007; /* RxCLK from Port1 */
4969 if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
4970 RegValue |= 0x0018; /* TxCLK from DPLL */
4971 else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
4972 RegValue |= 0x0020; /* TxCLK from BRG0 */
4973 else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4974 RegValue |= 0x0038; /* RxCLK from TXC Input */
4976 RegValue |= 0x0030; /* TxCLK from Port0 */
4978 usc_OutReg( info, CMCR, RegValue );
4981 /* Hardware Configuration Register (HCR)
4983 * <15..14> 00 CTR0 Divisor:00=32,01=16,10=8,11=4
4984 * <13> 0 CTR1DSel:0=CTR0Div determines CTR0Div
4985 * <12> 0 CVOK:0=report code violation in biphase
4986 * <11..10> 00 DPLL Divisor:00=32,01=16,10=8,11=4
4987 * <9..8> XX DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
4988 * <7..6> 00 reserved
4989 * <5> 0 BRG1 mode:0=continuous,1=single cycle
4991 * <3..2> 00 reserved
4992 * <1> 0 BRG0 mode:0=continuous,1=single cycle
4998 if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
5003 /* DPLL is enabled. Use BRG1 to provide continuous reference clock */
5004 /* for DPLL. DPLL mode in HCR is dependent on the encoding used. */
5006 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5007 XtalSpeed = 11059200;
5009 XtalSpeed = 14745600;
5011 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
5015 else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
5022 /* Tc = (Xtal/Speed) - 1 */
5023 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5024 /* then rounding up gives a more precise time constant. Instead */
5025 /* of rounding up and then subtracting 1 we just don't subtract */
5026 /* the one in this case. */
5028 /*--------------------------------------------------
5029 * ejz: for DPLL mode, application should use the
5030 * same clock speed as the partner system, even
5031 * though clocking is derived from the input RxData.
5032 * In case the user uses a 0 for the clock speed,
5033 * default to 0xffffffff and don't try to divide by
5035 *--------------------------------------------------*/
5036 if ( info->params.clock_speed )
5038 Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
5039 if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
5040 / info->params.clock_speed) )
5047 /* Write 16-bit Time Constant for BRG1 */
5048 usc_OutReg( info, TC1R, Tc );
5050 RegValue |= BIT4; /* enable BRG1 */
5052 switch ( info->params.encoding ) {
5053 case HDLC_ENCODING_NRZ:
5054 case HDLC_ENCODING_NRZB:
5055 case HDLC_ENCODING_NRZI_MARK:
5056 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
5057 case HDLC_ENCODING_BIPHASE_MARK:
5058 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
5059 case HDLC_ENCODING_BIPHASE_LEVEL:
5060 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
5064 usc_OutReg( info, HCR, RegValue );
5067 /* Channel Control/status Register (CCSR)
5069 * <15> X RCC FIFO Overflow status (RO)
5070 * <14> X RCC FIFO Not Empty status (RO)
5071 * <13> 0 1 = Clear RCC FIFO (WO)
5072 * <12> X DPLL Sync (RW)
5073 * <11> X DPLL 2 Missed Clocks status (RO)
5074 * <10> X DPLL 1 Missed Clock status (RO)
5075 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
5076 * <7> X SDLC Loop On status (RO)
5077 * <6> X SDLC Loop Send status (RO)
5078 * <5> 1 Bypass counters for TxClk and RxClk (RW)
5079 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
5080 * <1..0> 00 reserved
5082 * 0000 0000 0010 0000 = 0x0020
5085 usc_OutReg( info, CCSR, 0x1020 );
5088 if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
5089 usc_OutReg( info, SICR,
5090 (u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
5094 /* enable Master Interrupt Enable bit (MIE) */
5095 usc_EnableMasterIrqBit( info );
5097 usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
5098 TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
5100 /* arm RCC underflow interrupt */
5101 usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
5102 usc_EnableInterrupts(info, MISC);
5105 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5106 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5107 info->mbre_bit = BIT8;
5108 outw( BIT8, info->io_base ); /* set Master Bus Enable (DCAR) */
5110 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
5111 /* Enable DMAEN (Port 7, Bit 14) */
5112 /* This connects the DMA request signal to the ISA bus */
5113 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) & ~BIT14));
5116 /* DMA Control Register (DCR)
5118 * <15..14> 10 Priority mode = Alternating Tx/Rx
5119 * 01 Rx has priority
5120 * 00 Tx has priority
5122 * <13> 1 Enable Priority Preempt per DCR<15..14>
5123 * (WARNING DCR<11..10> must be 00 when this is 1)
5124 * 0 Choose activate channel per DCR<11..10>
5126 * <12> 0 Little Endian for Array/List
5127 * <11..10> 00 Both Channels can use each bus grant
5128 * <9..6> 0000 reserved
5129 * <5> 0 7 CLK - Minimum Bus Re-request Interval
5130 * <4> 0 1 = drive D/C and S/D pins
5131 * <3> 1 1 = Add one wait state to all DMA cycles.
5132 * <2> 0 1 = Strobe /UAS on every transfer.
5133 * <1..0> 11 Addr incrementing only affects LS24 bits
5135 * 0110 0000 0000 1011 = 0x600b
5138 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5139 /* PCI adapter does not need DMA wait state */
5140 usc_OutDmaReg( info, DCR, 0xa00b );
5143 usc_OutDmaReg( info, DCR, 0x800b );
5146 /* Receive DMA mode Register (RDMR)
5148 * <15..14> 11 DMA mode = Linked List Buffer mode
5149 * <13> 1 RSBinA/L = store Rx status Block in Arrary/List entry
5150 * <12> 1 Clear count of List Entry after fetching
5151 * <11..10> 00 Address mode = Increment
5152 * <9> 1 Terminate Buffer on RxBound
5153 * <8> 0 Bus Width = 16bits
5154 * <7..0> ? status Bits (write as 0s)
5156 * 1111 0010 0000 0000 = 0xf200
5159 usc_OutDmaReg( info, RDMR, 0xf200 );
5162 /* Transmit DMA mode Register (TDMR)
5164 * <15..14> 11 DMA mode = Linked List Buffer mode
5165 * <13> 1 TCBinA/L = fetch Tx Control Block from List entry
5166 * <12> 1 Clear count of List Entry after fetching
5167 * <11..10> 00 Address mode = Increment
5168 * <9> 1 Terminate Buffer on end of frame
5169 * <8> 0 Bus Width = 16bits
5170 * <7..0> ? status Bits (Read Only so write as 0)
5172 * 1111 0010 0000 0000 = 0xf200
5175 usc_OutDmaReg( info, TDMR, 0xf200 );
5178 /* DMA Interrupt Control Register (DICR)
5180 * <15> 1 DMA Interrupt Enable
5181 * <14> 0 1 = Disable IEO from USC
5182 * <13> 0 1 = Don't provide vector during IntAck
5183 * <12> 1 1 = Include status in Vector
5184 * <10..2> 0 reserved, Must be 0s
5185 * <1> 0 1 = Rx DMA Interrupt Enabled
5186 * <0> 0 1 = Tx DMA Interrupt Enabled
5188 * 1001 0000 0000 0000 = 0x9000
5191 usc_OutDmaReg( info, DICR, 0x9000 );
5193 usc_InDmaReg( info, RDMR ); /* clear pending receive DMA IRQ bits */
5194 usc_InDmaReg( info, TDMR ); /* clear pending transmit DMA IRQ bits */
5195 usc_OutDmaReg( info, CDIR, 0x0303 ); /* clear IUS and Pending for Tx and Rx */
5197 /* Channel Control Register (CCR)
5199 * <15..14> 10 Use 32-bit Tx Control Blocks (TCBs)
5200 * <13> 0 Trigger Tx on SW Command Disabled
5201 * <12> 0 Flag Preamble Disabled
5202 * <11..10> 00 Preamble Length
5203 * <9..8> 00 Preamble Pattern
5204 * <7..6> 10 Use 32-bit Rx status Blocks (RSBs)
5205 * <5> 0 Trigger Rx on SW Command Disabled
5208 * 1000 0000 1000 0000 = 0x8080
5213 switch ( info->params.preamble_length ) {
5214 case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
5215 case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
5216 case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
5219 switch ( info->params.preamble ) {
5220 case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
5221 case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
5222 case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
5223 case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 + BIT8; break;
5226 usc_OutReg( info, CCR, RegValue );
5230 * Burst/Dwell Control Register
5232 * <15..8> 0x20 Maximum number of transfers per bus grant
5233 * <7..0> 0x00 Maximum number of clock cycles per bus grant
5236 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5237 /* don't limit bus occupancy on PCI adapter */
5238 usc_OutDmaReg( info, BDCR, 0x0000 );
5241 usc_OutDmaReg( info, BDCR, 0x2000 );
5243 usc_stop_transmitter(info);
5244 usc_stop_receiver(info);
5246 } /* end of usc_set_sdlc_mode() */
5248 /* usc_enable_loopback()
5250 * Set the 16C32 for internal loopback mode.
5251 * The TxCLK and RxCLK signals are generated from the BRG0 and
5252 * the TxD is looped back to the RxD internally.
5254 * Arguments: info pointer to device instance data
5255 * enable 1 = enable loopback, 0 = disable
5256 * Return Value: None
5258 static void usc_enable_loopback(struct mgsl_struct *info, int enable)
5261 /* blank external TXD output */
5262 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
5264 /* Clock mode Control Register (CMCR)
5266 * <15..14> 00 counter 1 Disabled
5267 * <13..12> 00 counter 0 Disabled
5268 * <11..10> 11 BRG1 Input is TxC Pin
5269 * <9..8> 11 BRG0 Input is TxC Pin
5270 * <7..6> 01 DPLL Input is BRG1 Output
5271 * <5..3> 100 TxCLK comes from BRG0
5272 * <2..0> 100 RxCLK comes from BRG0
5274 * 0000 1111 0110 0100 = 0x0f64
5277 usc_OutReg( info, CMCR, 0x0f64 );
5279 /* Write 16-bit Time Constant for BRG0 */
5280 /* use clock speed if available, otherwise use 8 for diagnostics */
5281 if (info->params.clock_speed) {
5282 if (info->bus_type == MGSL_BUS_TYPE_PCI)
5283 usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
5285 usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
5287 usc_OutReg(info, TC0R, (u16)8);
5289 /* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
5290 mode = Continuous Set Bit 0 to enable BRG0. */
5291 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5293 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5294 usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
5296 /* set Internal Data loopback mode */
5297 info->loopback_bits = 0x300;
5298 outw( 0x0300, info->io_base + CCAR );
5300 /* enable external TXD output */
5301 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
5303 /* clear Internal Data loopback mode */
5304 info->loopback_bits = 0;
5305 outw( 0,info->io_base + CCAR );
5308 } /* end of usc_enable_loopback() */
5310 /* usc_enable_aux_clock()
5312 * Enabled the AUX clock output at the specified frequency.
5316 * info pointer to device extension
5317 * data_rate data rate of clock in bits per second
5318 * A data rate of 0 disables the AUX clock.
5320 * Return Value: None
5322 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
5328 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5329 XtalSpeed = 11059200;
5331 XtalSpeed = 14745600;
5334 /* Tc = (Xtal/Speed) - 1 */
5335 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5336 /* then rounding up gives a more precise time constant. Instead */
5337 /* of rounding up and then subtracting 1 we just don't subtract */
5338 /* the one in this case. */
5341 Tc = (u16)(XtalSpeed/data_rate);
5342 if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
5345 /* Write 16-bit Time Constant for BRG0 */
5346 usc_OutReg( info, TC0R, Tc );
5349 * Hardware Configuration Register (HCR)
5350 * Clear Bit 1, BRG0 mode = Continuous
5351 * Set Bit 0 to enable BRG0.
5354 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5356 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5357 usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
5359 /* data rate == 0 so turn off BRG0 */
5360 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
5363 } /* end of usc_enable_aux_clock() */
5367 * usc_process_rxoverrun_sync()
5369 * This function processes a receive overrun by resetting the
5370 * receive DMA buffers and issuing a Purge Rx FIFO command
5371 * to allow the receiver to continue receiving.
5375 * info pointer to device extension
5377 * Return Value: None
5379 static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
5383 int frame_start_index;
5384 bool start_of_frame_found = false;
5385 bool end_of_frame_found = false;
5386 bool reprogram_dma = false;
5388 DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
5391 usc_DmaCmd( info, DmaCmd_PauseRxChannel );
5392 usc_RCmd( info, RCmd_EnterHuntmode );
5393 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5395 /* CurrentRxBuffer points to the 1st buffer of the next */
5396 /* possibly available receive frame. */
5398 frame_start_index = start_index = end_index = info->current_rx_buffer;
5400 /* Search for an unfinished string of buffers. This means */
5401 /* that a receive frame started (at least one buffer with */
5402 /* count set to zero) but there is no terminiting buffer */
5403 /* (status set to non-zero). */
5405 while( !buffer_list[end_index].count )
5407 /* Count field has been reset to zero by 16C32. */
5408 /* This buffer is currently in use. */
5410 if ( !start_of_frame_found )
5412 start_of_frame_found = true;
5413 frame_start_index = end_index;
5414 end_of_frame_found = false;
5417 if ( buffer_list[end_index].status )
5419 /* Status field has been set by 16C32. */
5420 /* This is the last buffer of a received frame. */
5422 /* We want to leave the buffers for this frame intact. */
5423 /* Move on to next possible frame. */
5425 start_of_frame_found = false;
5426 end_of_frame_found = true;
5429 /* advance to next buffer entry in linked list */
5431 if ( end_index == info->rx_buffer_count )
5434 if ( start_index == end_index )
5436 /* The entire list has been searched with all Counts == 0 and */
5437 /* all Status == 0. The receive buffers are */
5438 /* completely screwed, reset all receive buffers! */
5439 mgsl_reset_rx_dma_buffers( info );
5440 frame_start_index = 0;
5441 start_of_frame_found = false;
5442 reprogram_dma = true;
5447 if ( start_of_frame_found && !end_of_frame_found )
5449 /* There is an unfinished string of receive DMA buffers */
5450 /* as a result of the receiver overrun. */
5452 /* Reset the buffers for the unfinished frame */
5453 /* and reprogram the receive DMA controller to start */
5454 /* at the 1st buffer of unfinished frame. */
5456 start_index = frame_start_index;
5460 *((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
5462 /* Adjust index for wrap around. */
5463 if ( start_index == info->rx_buffer_count )
5466 } while( start_index != end_index );
5468 reprogram_dma = true;
5471 if ( reprogram_dma )
5473 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
5474 usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5475 usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5477 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5479 /* This empties the receive FIFO and loads the RCC with RCLR */
5480 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5482 /* program 16C32 with physical address of 1st DMA buffer entry */
5483 phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
5484 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5485 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5487 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5488 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5489 usc_EnableInterrupts( info, RECEIVE_STATUS );
5491 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5492 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5494 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5495 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5496 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5497 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5498 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5500 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5504 /* This empties the receive FIFO and loads the RCC with RCLR */
5505 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5506 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5509 } /* end of usc_process_rxoverrun_sync() */
5511 /* usc_stop_receiver()
5513 * Disable USC receiver
5515 * Arguments: info pointer to device instance data
5516 * Return Value: None
5518 static void usc_stop_receiver( struct mgsl_struct *info )
5520 if (debug_level >= DEBUG_LEVEL_ISR)
5521 printk("%s(%d):usc_stop_receiver(%s)\n",
5522 __FILE__,__LINE__, info->device_name );
5524 /* Disable receive DMA channel. */
5525 /* This also disables receive DMA channel interrupts */
5526 usc_DmaCmd( info, DmaCmd_ResetRxChannel );
5528 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5529 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5530 usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
5532 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5534 /* This empties the receive FIFO and loads the RCC with RCLR */
5535 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5536 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5538 info->rx_enabled = false;
5539 info->rx_overflow = false;
5540 info->rx_rcc_underrun = false;
5542 } /* end of stop_receiver() */
5544 /* usc_start_receiver()
5546 * Enable the USC receiver
5548 * Arguments: info pointer to device instance data
5549 * Return Value: None
5551 static void usc_start_receiver( struct mgsl_struct *info )
5555 if (debug_level >= DEBUG_LEVEL_ISR)
5556 printk("%s(%d):usc_start_receiver(%s)\n",
5557 __FILE__,__LINE__, info->device_name );
5559 mgsl_reset_rx_dma_buffers( info );
5560 usc_stop_receiver( info );
5562 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5563 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5565 if ( info->params.mode == MGSL_MODE_HDLC ||
5566 info->params.mode == MGSL_MODE_RAW ) {
5567 /* DMA mode Transfers */
5568 /* Program the DMA controller. */
5569 /* Enable the DMA controller end of buffer interrupt. */
5571 /* program 16C32 with physical address of 1st DMA buffer entry */
5572 phys_addr = info->rx_buffer_list[0].phys_entry;
5573 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5574 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5576 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5577 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5578 usc_EnableInterrupts( info, RECEIVE_STATUS );
5580 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5581 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5583 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5584 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5585 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5586 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5587 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5589 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5591 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
5592 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
5593 usc_EnableInterrupts(info, RECEIVE_DATA);
5595 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5596 usc_RCmd( info, RCmd_EnterHuntmode );
5598 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5601 usc_OutReg( info, CCSR, 0x1020 );
5603 info->rx_enabled = true;
5605 } /* end of usc_start_receiver() */
5607 /* usc_start_transmitter()
5609 * Enable the USC transmitter and send a transmit frame if
5610 * one is loaded in the DMA buffers.
5612 * Arguments: info pointer to device instance data
5613 * Return Value: None
5615 static void usc_start_transmitter( struct mgsl_struct *info )
5618 unsigned int FrameSize;
5620 if (debug_level >= DEBUG_LEVEL_ISR)
5621 printk("%s(%d):usc_start_transmitter(%s)\n",
5622 __FILE__,__LINE__, info->device_name );
5624 if ( info->xmit_cnt ) {
5626 /* If auto RTS enabled and RTS is inactive, then assert */
5627 /* RTS and set a flag indicating that the driver should */
5628 /* negate RTS when the transmission completes. */
5630 info->drop_rts_on_tx_done = false;
5632 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
5633 usc_get_serial_signals( info );
5634 if ( !(info->serial_signals & SerialSignal_RTS) ) {
5635 info->serial_signals |= SerialSignal_RTS;
5636 usc_set_serial_signals( info );
5637 info->drop_rts_on_tx_done = true;
5642 if ( info->params.mode == MGSL_MODE_ASYNC ) {
5643 if ( !info->tx_active ) {
5644 usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
5645 usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
5646 usc_EnableInterrupts(info, TRANSMIT_DATA);
5647 usc_load_txfifo(info);
5650 /* Disable transmit DMA controller while programming. */
5651 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5653 /* Transmit DMA buffer is loaded, so program USC */
5654 /* to send the frame contained in the buffers. */
5656 FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
5658 /* if operating in Raw sync mode, reset the rcc component
5659 * of the tx dma buffer entry, otherwise, the serial controller
5660 * will send a closing sync char after this count.
5662 if ( info->params.mode == MGSL_MODE_RAW )
5663 info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
5665 /* Program the Transmit Character Length Register (TCLR) */
5666 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
5667 usc_OutReg( info, TCLR, (u16)FrameSize );
5669 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5671 /* Program the address of the 1st DMA Buffer Entry in linked list */
5672 phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
5673 usc_OutDmaReg( info, NTARL, (u16)phys_addr );
5674 usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
5676 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5677 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
5678 usc_EnableInterrupts( info, TRANSMIT_STATUS );
5680 if ( info->params.mode == MGSL_MODE_RAW &&
5681 info->num_tx_dma_buffers > 1 ) {
5682 /* When running external sync mode, attempt to 'stream' transmit */
5683 /* by filling tx dma buffers as they become available. To do this */
5684 /* we need to enable Tx DMA EOB Status interrupts : */
5686 /* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
5687 /* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
5689 usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
5690 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
5693 /* Initialize Transmit DMA Channel */
5694 usc_DmaCmd( info, DmaCmd_InitTxChannel );
5696 usc_TCmd( info, TCmd_SendFrame );
5698 mod_timer(&info->tx_timer, jiffies +
5699 msecs_to_jiffies(5000));
5701 info->tx_active = true;
5704 if ( !info->tx_enabled ) {
5705 info->tx_enabled = true;
5706 if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
5707 usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
5709 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
5712 } /* end of usc_start_transmitter() */
5714 /* usc_stop_transmitter()
5716 * Stops the transmitter and DMA
5718 * Arguments: info pointer to device isntance data
5719 * Return Value: None
5721 static void usc_stop_transmitter( struct mgsl_struct *info )
5723 if (debug_level >= DEBUG_LEVEL_ISR)
5724 printk("%s(%d):usc_stop_transmitter(%s)\n",
5725 __FILE__,__LINE__, info->device_name );
5727 del_timer(&info->tx_timer);
5729 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5730 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5731 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5733 usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
5734 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5735 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5737 info->tx_enabled = false;
5738 info->tx_active = false;
5740 } /* end of usc_stop_transmitter() */
5742 /* usc_load_txfifo()
5744 * Fill the transmit FIFO until the FIFO is full or
5745 * there is no more data to load.
5747 * Arguments: info pointer to device extension (instance data)
5748 * Return Value: None
5750 static void usc_load_txfifo( struct mgsl_struct *info )
5755 if ( !info->xmit_cnt && !info->x_char )
5758 /* Select transmit FIFO status readback in TICR */
5759 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
5761 /* load the Transmit FIFO until FIFOs full or all data sent */
5763 while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
5764 /* there is more space in the transmit FIFO and */
5765 /* there is more data in transmit buffer */
5767 if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
5768 /* write a 16-bit word from transmit buffer to 16C32 */
5770 TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
5771 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5772 TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
5773 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5775 outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
5777 info->xmit_cnt -= 2;
5778 info->icount.tx += 2;
5780 /* only 1 byte left to transmit or 1 FIFO slot left */
5782 outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
5783 info->io_base + CCAR );
5786 /* transmit pending high priority char */
5787 outw( info->x_char,info->io_base + CCAR );
5790 outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
5791 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5798 } /* end of usc_load_txfifo() */
5802 * Reset the adapter to a known state and prepare it for further use.
5804 * Arguments: info pointer to device instance data
5805 * Return Value: None
5807 static void usc_reset( struct mgsl_struct *info )
5809 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5813 /* Set BIT30 of Misc Control Register */
5814 /* (Local Control Register 0x50) to force reset of USC. */
5816 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5817 u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
5819 info->misc_ctrl_value |= BIT30;
5820 *MiscCtrl = info->misc_ctrl_value;
5823 * Force at least 170ns delay before clearing
5824 * reset bit. Each read from LCR takes at least
5825 * 30ns so 10 times for 300ns to be safe.
5828 readval = *MiscCtrl;
5830 info->misc_ctrl_value &= ~BIT30;
5831 *MiscCtrl = info->misc_ctrl_value;
5833 *LCR0BRDR = BUS_DESCRIPTOR(
5834 1, // Write Strobe Hold (0-3)
5835 2, // Write Strobe Delay (0-3)
5836 2, // Read Strobe Delay (0-3)
5837 0, // NWDD (Write data-data) (0-3)
5838 4, // NWAD (Write Addr-data) (0-31)
5839 0, // NXDA (Read/Write Data-Addr) (0-3)
5840 0, // NRDD (Read Data-Data) (0-3)
5841 5 // NRAD (Read Addr-Data) (0-31)
5845 outb( 0,info->io_base + 8 );
5849 info->loopback_bits = 0;
5850 info->usc_idle_mode = 0;
5853 * Program the Bus Configuration Register (BCR)
5855 * <15> 0 Don't use separate address
5856 * <14..6> 0 reserved
5857 * <5..4> 00 IAckmode = Default, don't care
5858 * <3> 1 Bus Request Totem Pole output
5859 * <2> 1 Use 16 Bit data bus
5860 * <1> 0 IRQ Totem Pole output
5861 * <0> 0 Don't Shift Right Addr
5863 * 0000 0000 0000 1100 = 0x000c
5865 * By writing to io_base + SDPIN the Wait/Ack pin is
5866 * programmed to work as a Wait pin.
5869 outw( 0x000c,info->io_base + SDPIN );
5872 outw( 0,info->io_base );
5873 outw( 0,info->io_base + CCAR );
5875 /* select little endian byte ordering */
5876 usc_RTCmd( info, RTCmd_SelectLittleEndian );
5879 /* Port Control Register (PCR)
5881 * <15..14> 11 Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
5882 * <13..12> 11 Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
5883 * <11..10> 00 Port 5 is Input (No Connect, Don't Care)
5884 * <9..8> 00 Port 4 is Input (No Connect, Don't Care)
5885 * <7..6> 11 Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
5886 * <5..4> 11 Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
5887 * <3..2> 01 Port 1 is Input (Dedicated RxC)
5888 * <1..0> 01 Port 0 is Input (Dedicated TxC)
5890 * 1111 0000 1111 0101 = 0xf0f5
5893 usc_OutReg( info, PCR, 0xf0f5 );
5897 * Input/Output Control Register
5899 * <15..14> 00 CTS is active low input
5900 * <13..12> 00 DCD is active low input
5901 * <11..10> 00 TxREQ pin is input (DSR)
5902 * <9..8> 00 RxREQ pin is input (RI)
5903 * <7..6> 00 TxD is output (Transmit Data)
5904 * <5..3> 000 TxC Pin in Input (14.7456MHz Clock)
5905 * <2..0> 100 RxC is Output (drive with BRG0)
5907 * 0000 0000 0000 0100 = 0x0004
5910 usc_OutReg( info, IOCR, 0x0004 );
5912 } /* end of usc_reset() */
5914 /* usc_set_async_mode()
5916 * Program adapter for asynchronous communications.
5918 * Arguments: info pointer to device instance data
5919 * Return Value: None
5921 static void usc_set_async_mode( struct mgsl_struct *info )
5925 /* disable interrupts while programming USC */
5926 usc_DisableMasterIrqBit( info );
5928 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5929 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5931 usc_loopback_frame( info );
5933 /* Channel mode Register (CMR)
5935 * <15..14> 00 Tx Sub modes, 00 = 1 Stop Bit
5936 * <13..12> 00 00 = 16X Clock
5937 * <11..8> 0000 Transmitter mode = Asynchronous
5938 * <7..6> 00 reserved?
5939 * <5..4> 00 Rx Sub modes, 00 = 16X Clock
5940 * <3..0> 0000 Receiver mode = Asynchronous
5942 * 0000 0000 0000 0000 = 0x0
5946 if ( info->params.stop_bits != 1 )
5948 usc_OutReg( info, CMR, RegValue );
5951 /* Receiver mode Register (RMR)
5953 * <15..13> 000 encoding = None
5954 * <12..08> 00000 reserved (Sync Only)
5955 * <7..6> 00 Even parity
5956 * <5> 0 parity disabled
5957 * <4..2> 000 Receive Char Length = 8 bits
5958 * <1..0> 00 Disable Receiver
5960 * 0000 0000 0000 0000 = 0x0
5965 if ( info->params.data_bits != 8 )
5966 RegValue |= BIT4+BIT3+BIT2;
5968 if ( info->params.parity != ASYNC_PARITY_NONE ) {
5970 if ( info->params.parity != ASYNC_PARITY_ODD )
5974 usc_OutReg( info, RMR, RegValue );
5977 /* Set IRQ trigger level */
5979 usc_RCmd( info, RCmd_SelectRicrIntLevel );
5982 /* Receive Interrupt Control Register (RICR)
5984 * <15..8> ? RxFIFO IRQ Request Level
5986 * Note: For async mode the receive FIFO level must be set
5987 * to 0 to avoid the situation where the FIFO contains fewer bytes
5988 * than the trigger level and no more data is expected.
5990 * <7> 0 Exited Hunt IA (Interrupt Arm)
5991 * <6> 0 Idle Received IA
5992 * <5> 0 Break/Abort IA
5994 * <3> 0 Queued status reflects oldest byte in FIFO
5996 * <1> 0 Rx Overrun IA
5997 * <0> 0 Select TC0 value for readback
5999 * 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
6002 usc_OutReg( info, RICR, 0x0000 );
6004 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
6005 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
6008 /* Transmit mode Register (TMR)
6010 * <15..13> 000 encoding = None
6011 * <12..08> 00000 reserved (Sync Only)
6012 * <7..6> 00 Transmit parity Even
6013 * <5> 0 Transmit parity Disabled
6014 * <4..2> 000 Tx Char Length = 8 bits
6015 * <1..0> 00 Disable Transmitter
6017 * 0000 0000 0000 0000 = 0x0
6022 if ( info->params.data_bits != 8 )
6023 RegValue |= BIT4+BIT3+BIT2;
6025 if ( info->params.parity != ASYNC_PARITY_NONE ) {
6027 if ( info->params.parity != ASYNC_PARITY_ODD )
6031 usc_OutReg( info, TMR, RegValue );
6033 usc_set_txidle( info );
6036 /* Set IRQ trigger level */
6038 usc_TCmd( info, TCmd_SelectTicrIntLevel );
6041 /* Transmit Interrupt Control Register (TICR)
6043 * <15..8> ? Transmit FIFO IRQ Level
6044 * <7> 0 Present IA (Interrupt Arm)
6045 * <6> 1 Idle Sent IA
6046 * <5> 0 Abort Sent IA
6047 * <4> 0 EOF/EOM Sent IA
6049 * <2> 0 1 = Wait for SW Trigger to Start Frame
6050 * <1> 0 Tx Underrun IA
6051 * <0> 0 TC0 constant on read back
6053 * 0000 0000 0100 0000 = 0x0040
6056 usc_OutReg( info, TICR, 0x1f40 );
6058 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
6059 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
6061 usc_enable_async_clock( info, info->params.data_rate );
6064 /* Channel Control/status Register (CCSR)
6066 * <15> X RCC FIFO Overflow status (RO)
6067 * <14> X RCC FIFO Not Empty status (RO)
6068 * <13> 0 1 = Clear RCC FIFO (WO)
6069 * <12> X DPLL in Sync status (RO)
6070 * <11> X DPLL 2 Missed Clocks status (RO)
6071 * <10> X DPLL 1 Missed Clock status (RO)
6072 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
6073 * <7> X SDLC Loop On status (RO)
6074 * <6> X SDLC Loop Send status (RO)
6075 * <5> 1 Bypass counters for TxClk and RxClk (RW)
6076 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
6077 * <1..0> 00 reserved
6079 * 0000 0000 0010 0000 = 0x0020
6082 usc_OutReg( info, CCSR, 0x0020 );
6084 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6085 RECEIVE_DATA + RECEIVE_STATUS );
6087 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6088 RECEIVE_DATA + RECEIVE_STATUS );
6090 usc_EnableMasterIrqBit( info );
6092 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6093 /* Enable INTEN (Port 6, Bit12) */
6094 /* This connects the IRQ request signal to the ISA bus */
6095 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6098 if (info->params.loopback) {
6099 info->loopback_bits = 0x300;
6100 outw(0x0300, info->io_base + CCAR);
6103 } /* end of usc_set_async_mode() */
6105 /* usc_loopback_frame()
6107 * Loop back a small (2 byte) dummy SDLC frame.
6108 * Interrupts and DMA are NOT used. The purpose of this is to
6109 * clear any 'stale' status info left over from running in async mode.
6111 * The 16C32 shows the strange behaviour of marking the 1st
6112 * received SDLC frame with a CRC error even when there is no
6113 * CRC error. To get around this a small dummy from of 2 bytes
6114 * is looped back when switching from async to sync mode.
6116 * Arguments: info pointer to device instance data
6117 * Return Value: None
6119 static void usc_loopback_frame( struct mgsl_struct *info )
6122 unsigned long oldmode = info->params.mode;
6124 info->params.mode = MGSL_MODE_HDLC;
6126 usc_DisableMasterIrqBit( info );
6128 usc_set_sdlc_mode( info );
6129 usc_enable_loopback( info, 1 );
6131 /* Write 16-bit Time Constant for BRG0 */
6132 usc_OutReg( info, TC0R, 0 );
6134 /* Channel Control Register (CCR)
6136 * <15..14> 00 Don't use 32-bit Tx Control Blocks (TCBs)
6137 * <13> 0 Trigger Tx on SW Command Disabled
6138 * <12> 0 Flag Preamble Disabled
6139 * <11..10> 00 Preamble Length = 8-Bits
6140 * <9..8> 01 Preamble Pattern = flags
6141 * <7..6> 10 Don't use 32-bit Rx status Blocks (RSBs)
6142 * <5> 0 Trigger Rx on SW Command Disabled
6145 * 0000 0001 0000 0000 = 0x0100
6148 usc_OutReg( info, CCR, 0x0100 );
6150 /* SETUP RECEIVER */
6151 usc_RTCmd( info, RTCmd_PurgeRxFifo );
6152 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
6154 /* SETUP TRANSMITTER */
6155 /* Program the Transmit Character Length Register (TCLR) */
6156 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
6157 usc_OutReg( info, TCLR, 2 );
6158 usc_RTCmd( info, RTCmd_PurgeTxFifo );
6160 /* unlatch Tx status bits, and start transmit channel. */
6161 usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
6162 outw(0,info->io_base + DATAREG);
6164 /* ENABLE TRANSMITTER */
6165 usc_TCmd( info, TCmd_SendFrame );
6166 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
6168 /* WAIT FOR RECEIVE COMPLETE */
6169 for (i=0 ; i<1000 ; i++)
6170 if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
6173 /* clear Internal Data loopback mode */
6174 usc_enable_loopback(info, 0);
6176 usc_EnableMasterIrqBit(info);
6178 info->params.mode = oldmode;
6180 } /* end of usc_loopback_frame() */
6182 /* usc_set_sync_mode() Programs the USC for SDLC communications.
6184 * Arguments: info pointer to adapter info structure
6185 * Return Value: None
6187 static void usc_set_sync_mode( struct mgsl_struct *info )
6189 usc_loopback_frame( info );
6190 usc_set_sdlc_mode( info );
6192 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6193 /* Enable INTEN (Port 6, Bit12) */
6194 /* This connects the IRQ request signal to the ISA bus */
6195 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6198 usc_enable_aux_clock(info, info->params.clock_speed);
6200 if (info->params.loopback)
6201 usc_enable_loopback(info,1);
6203 } /* end of mgsl_set_sync_mode() */
6205 /* usc_set_txidle() Set the HDLC idle mode for the transmitter.
6207 * Arguments: info pointer to device instance data
6208 * Return Value: None
6210 static void usc_set_txidle( struct mgsl_struct *info )
6212 u16 usc_idle_mode = IDLEMODE_FLAGS;
6214 /* Map API idle mode to USC register bits */
6216 switch( info->idle_mode ){
6217 case HDLC_TXIDLE_FLAGS: usc_idle_mode = IDLEMODE_FLAGS; break;
6218 case HDLC_TXIDLE_ALT_ZEROS_ONES: usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
6219 case HDLC_TXIDLE_ZEROS: usc_idle_mode = IDLEMODE_ZERO; break;
6220 case HDLC_TXIDLE_ONES: usc_idle_mode = IDLEMODE_ONE; break;
6221 case HDLC_TXIDLE_ALT_MARK_SPACE: usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
6222 case HDLC_TXIDLE_SPACE: usc_idle_mode = IDLEMODE_SPACE; break;
6223 case HDLC_TXIDLE_MARK: usc_idle_mode = IDLEMODE_MARK; break;
6226 info->usc_idle_mode = usc_idle_mode;
6227 //usc_OutReg(info, TCSR, usc_idle_mode);
6228 info->tcsr_value &= ~IDLEMODE_MASK; /* clear idle mode bits */
6229 info->tcsr_value += usc_idle_mode;
6230 usc_OutReg(info, TCSR, info->tcsr_value);
6233 * if SyncLink WAN adapter is running in external sync mode, the
6234 * transmitter has been set to Monosync in order to try to mimic
6235 * a true raw outbound bit stream. Monosync still sends an open/close
6236 * sync char at the start/end of a frame. Try to match those sync
6237 * patterns to the idle mode set here
6239 if ( info->params.mode == MGSL_MODE_RAW ) {
6240 unsigned char syncpat = 0;
6241 switch( info->idle_mode ) {
6242 case HDLC_TXIDLE_FLAGS:
6245 case HDLC_TXIDLE_ALT_ZEROS_ONES:
6248 case HDLC_TXIDLE_ZEROS:
6249 case HDLC_TXIDLE_SPACE:
6252 case HDLC_TXIDLE_ONES:
6253 case HDLC_TXIDLE_MARK:
6256 case HDLC_TXIDLE_ALT_MARK_SPACE:
6261 usc_SetTransmitSyncChars(info,syncpat,syncpat);
6264 } /* end of usc_set_txidle() */
6266 /* usc_get_serial_signals()
6268 * Query the adapter for the state of the V24 status (input) signals.
6270 * Arguments: info pointer to device instance data
6271 * Return Value: None
6273 static void usc_get_serial_signals( struct mgsl_struct *info )
6277 /* clear all serial signals except DTR and RTS */
6278 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
6280 /* Read the Misc Interrupt status Register (MISR) to get */
6281 /* the V24 status signals. */
6283 status = usc_InReg( info, MISR );
6285 /* set serial signal bits to reflect MISR */
6287 if ( status & MISCSTATUS_CTS )
6288 info->serial_signals |= SerialSignal_CTS;
6290 if ( status & MISCSTATUS_DCD )
6291 info->serial_signals |= SerialSignal_DCD;
6293 if ( status & MISCSTATUS_RI )
6294 info->serial_signals |= SerialSignal_RI;
6296 if ( status & MISCSTATUS_DSR )
6297 info->serial_signals |= SerialSignal_DSR;
6299 } /* end of usc_get_serial_signals() */
6301 /* usc_set_serial_signals()
6303 * Set the state of DTR and RTS based on contents of
6304 * serial_signals member of device extension.
6306 * Arguments: info pointer to device instance data
6307 * Return Value: None
6309 static void usc_set_serial_signals( struct mgsl_struct *info )
6312 unsigned char V24Out = info->serial_signals;
6314 /* get the current value of the Port Control Register (PCR) */
6316 Control = usc_InReg( info, PCR );
6318 if ( V24Out & SerialSignal_RTS )
6323 if ( V24Out & SerialSignal_DTR )
6328 usc_OutReg( info, PCR, Control );
6330 } /* end of usc_set_serial_signals() */
6332 /* usc_enable_async_clock()
6334 * Enable the async clock at the specified frequency.
6336 * Arguments: info pointer to device instance data
6337 * data_rate data rate of clock in bps
6338 * 0 disables the AUX clock.
6339 * Return Value: None
6341 static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
6345 * Clock mode Control Register (CMCR)
6347 * <15..14> 00 counter 1 Disabled
6348 * <13..12> 00 counter 0 Disabled
6349 * <11..10> 11 BRG1 Input is TxC Pin
6350 * <9..8> 11 BRG0 Input is TxC Pin
6351 * <7..6> 01 DPLL Input is BRG1 Output
6352 * <5..3> 100 TxCLK comes from BRG0
6353 * <2..0> 100 RxCLK comes from BRG0
6355 * 0000 1111 0110 0100 = 0x0f64
6358 usc_OutReg( info, CMCR, 0x0f64 );
6362 * Write 16-bit Time Constant for BRG0
6363 * Time Constant = (ClkSpeed / data_rate) - 1
6364 * ClkSpeed = 921600 (ISA), 691200 (PCI)
6367 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6368 usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
6370 usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
6374 * Hardware Configuration Register (HCR)
6375 * Clear Bit 1, BRG0 mode = Continuous
6376 * Set Bit 0 to enable BRG0.
6379 usc_OutReg( info, HCR,
6380 (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
6383 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
6385 usc_OutReg( info, IOCR,
6386 (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
6388 /* data rate == 0 so turn off BRG0 */
6389 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
6392 } /* end of usc_enable_async_clock() */
6395 * Buffer Structures:
6397 * Normal memory access uses virtual addresses that can make discontiguous
6398 * physical memory pages appear to be contiguous in the virtual address
6399 * space (the processors memory mapping handles the conversions).
6401 * DMA transfers require physically contiguous memory. This is because
6402 * the DMA system controller and DMA bus masters deal with memory using
6403 * only physical addresses.
6405 * This causes a problem under Windows NT when large DMA buffers are
6406 * needed. Fragmentation of the nonpaged pool prevents allocations of
6407 * physically contiguous buffers larger than the PAGE_SIZE.
6409 * However the 16C32 supports Bus Master Scatter/Gather DMA which
6410 * allows DMA transfers to physically discontiguous buffers. Information
6411 * about each data transfer buffer is contained in a memory structure
6412 * called a 'buffer entry'. A list of buffer entries is maintained
6413 * to track and control the use of the data transfer buffers.
6415 * To support this strategy we will allocate sufficient PAGE_SIZE
6416 * contiguous memory buffers to allow for the total required buffer
6419 * The 16C32 accesses the list of buffer entries using Bus Master
6420 * DMA. Control information is read from the buffer entries by the
6421 * 16C32 to control data transfers. status information is written to
6422 * the buffer entries by the 16C32 to indicate the status of completed
6425 * The CPU writes control information to the buffer entries to control
6426 * the 16C32 and reads status information from the buffer entries to
6427 * determine information about received and transmitted frames.
6429 * Because the CPU and 16C32 (adapter) both need simultaneous access
6430 * to the buffer entries, the buffer entry memory is allocated with
6431 * HalAllocateCommonBuffer(). This restricts the size of the buffer
6432 * entry list to PAGE_SIZE.
6434 * The actual data buffers on the other hand will only be accessed
6435 * by the CPU or the adapter but not by both simultaneously. This allows
6436 * Scatter/Gather packet based DMA procedures for using physically
6437 * discontiguous pages.
6441 * mgsl_reset_tx_dma_buffers()
6443 * Set the count for all transmit buffers to 0 to indicate the
6444 * buffer is available for use and set the current buffer to the
6445 * first buffer. This effectively makes all buffers free and
6446 * discards any data in buffers.
6448 * Arguments: info pointer to device instance data
6449 * Return Value: None
6451 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
6455 for ( i = 0; i < info->tx_buffer_count; i++ ) {
6456 *((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
6459 info->current_tx_buffer = 0;
6460 info->start_tx_dma_buffer = 0;
6461 info->tx_dma_buffers_used = 0;
6463 info->get_tx_holding_index = 0;
6464 info->put_tx_holding_index = 0;
6465 info->tx_holding_count = 0;
6467 } /* end of mgsl_reset_tx_dma_buffers() */
6470 * num_free_tx_dma_buffers()
6472 * returns the number of free tx dma buffers available
6474 * Arguments: info pointer to device instance data
6475 * Return Value: number of free tx dma buffers
6477 static int num_free_tx_dma_buffers(struct mgsl_struct *info)
6479 return info->tx_buffer_count - info->tx_dma_buffers_used;
6483 * mgsl_reset_rx_dma_buffers()
6485 * Set the count for all receive buffers to DMABUFFERSIZE
6486 * and set the current buffer to the first buffer. This effectively
6487 * makes all buffers free and discards any data in buffers.
6489 * Arguments: info pointer to device instance data
6490 * Return Value: None
6492 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
6496 for ( i = 0; i < info->rx_buffer_count; i++ ) {
6497 *((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
6498 // info->rx_buffer_list[i].count = DMABUFFERSIZE;
6499 // info->rx_buffer_list[i].status = 0;
6502 info->current_rx_buffer = 0;
6504 } /* end of mgsl_reset_rx_dma_buffers() */
6507 * mgsl_free_rx_frame_buffers()
6509 * Free the receive buffers used by a received SDLC
6510 * frame such that the buffers can be reused.
6514 * info pointer to device instance data
6515 * StartIndex index of 1st receive buffer of frame
6516 * EndIndex index of last receive buffer of frame
6518 * Return Value: None
6520 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
6523 DMABUFFERENTRY *pBufEntry;
6526 /* Starting with 1st buffer entry of the frame clear the status */
6527 /* field and set the count field to DMA Buffer Size. */
6532 pBufEntry = &(info->rx_buffer_list[Index]);
6534 if ( Index == EndIndex ) {
6535 /* This is the last buffer of the frame! */
6539 /* reset current buffer for reuse */
6540 // pBufEntry->status = 0;
6541 // pBufEntry->count = DMABUFFERSIZE;
6542 *((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
6544 /* advance to next buffer entry in linked list */
6546 if ( Index == info->rx_buffer_count )
6550 /* set current buffer to next buffer after last buffer of frame */
6551 info->current_rx_buffer = Index;
6553 } /* end of free_rx_frame_buffers() */
6555 /* mgsl_get_rx_frame()
6557 * This function attempts to return a received SDLC frame from the
6558 * receive DMA buffers. Only frames received without errors are returned.
6560 * Arguments: info pointer to device extension
6561 * Return Value: true if frame returned, otherwise false
6563 static bool mgsl_get_rx_frame(struct mgsl_struct *info)
6565 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
6566 unsigned short status;
6567 DMABUFFERENTRY *pBufEntry;
6568 unsigned int framesize = 0;
6569 bool ReturnCode = false;
6570 unsigned long flags;
6571 struct tty_struct *tty = info->port.tty;
6572 bool return_frame = false;
6575 * current_rx_buffer points to the 1st buffer of the next available
6576 * receive frame. To find the last buffer of the frame look for
6577 * a non-zero status field in the buffer entries. (The status
6578 * field is set by the 16C32 after completing a receive frame.
6581 StartIndex = EndIndex = info->current_rx_buffer;
6583 while( !info->rx_buffer_list[EndIndex].status ) {
6585 * If the count field of the buffer entry is non-zero then
6586 * this buffer has not been used. (The 16C32 clears the count
6587 * field when it starts using the buffer.) If an unused buffer
6588 * is encountered then there are no frames available.
6591 if ( info->rx_buffer_list[EndIndex].count )
6594 /* advance to next buffer entry in linked list */
6596 if ( EndIndex == info->rx_buffer_count )
6599 /* if entire list searched then no frame available */
6600 if ( EndIndex == StartIndex ) {
6601 /* If this occurs then something bad happened,
6602 * all buffers have been 'used' but none mark
6603 * the end of a frame. Reset buffers and receiver.
6606 if ( info->rx_enabled ){
6607 spin_lock_irqsave(&info->irq_spinlock,flags);
6608 usc_start_receiver(info);
6609 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6616 /* check status of receive frame */
6618 status = info->rx_buffer_list[EndIndex].status;
6620 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6621 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6622 if ( status & RXSTATUS_SHORT_FRAME )
6623 info->icount.rxshort++;
6624 else if ( status & RXSTATUS_ABORT )
6625 info->icount.rxabort++;
6626 else if ( status & RXSTATUS_OVERRUN )
6627 info->icount.rxover++;
6629 info->icount.rxcrc++;
6630 if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
6631 return_frame = true;
6634 #if SYNCLINK_GENERIC_HDLC
6636 struct net_device_stats *stats = hdlc_stats(info->netdev);
6638 stats->rx_frame_errors++;
6642 return_frame = true;
6644 if ( return_frame ) {
6645 /* receive frame has no errors, get frame size.
6646 * The frame size is the starting value of the RCC (which was
6647 * set to 0xffff) minus the ending value of the RCC (decremented
6648 * once for each receive character) minus 2 for the 16-bit CRC.
6651 framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
6653 /* adjust frame size for CRC if any */
6654 if ( info->params.crc_type == HDLC_CRC_16_CCITT )
6656 else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
6660 if ( debug_level >= DEBUG_LEVEL_BH )
6661 printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
6662 __FILE__,__LINE__,info->device_name,status,framesize);
6664 if ( debug_level >= DEBUG_LEVEL_DATA )
6665 mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
6666 min_t(int, framesize, DMABUFFERSIZE),0);
6669 if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
6670 ((framesize+1) > info->max_frame_size) ) ||
6671 (framesize > info->max_frame_size) )
6672 info->icount.rxlong++;
6674 /* copy dma buffer(s) to contiguous intermediate buffer */
6675 int copy_count = framesize;
6676 int index = StartIndex;
6677 unsigned char *ptmp = info->intermediate_rxbuffer;
6679 if ( !(status & RXSTATUS_CRC_ERROR))
6680 info->icount.rxok++;
6684 if ( copy_count > DMABUFFERSIZE )
6685 partial_count = DMABUFFERSIZE;
6687 partial_count = copy_count;
6689 pBufEntry = &(info->rx_buffer_list[index]);
6690 memcpy( ptmp, pBufEntry->virt_addr, partial_count );
6691 ptmp += partial_count;
6692 copy_count -= partial_count;
6694 if ( ++index == info->rx_buffer_count )
6698 if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
6700 *ptmp = (status & RXSTATUS_CRC_ERROR ?
6704 if ( debug_level >= DEBUG_LEVEL_DATA )
6705 printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
6706 __FILE__,__LINE__,info->device_name,
6710 #if SYNCLINK_GENERIC_HDLC
6712 hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
6715 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6718 /* Free the buffers used by this frame. */
6719 mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
6725 if ( info->rx_enabled && info->rx_overflow ) {
6726 /* The receiver needs to restarted because of
6727 * a receive overflow (buffer or FIFO). If the
6728 * receive buffers are now empty, then restart receiver.
6731 if ( !info->rx_buffer_list[EndIndex].status &&
6732 info->rx_buffer_list[EndIndex].count ) {
6733 spin_lock_irqsave(&info->irq_spinlock,flags);
6734 usc_start_receiver(info);
6735 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6741 } /* end of mgsl_get_rx_frame() */
6743 /* mgsl_get_raw_rx_frame()
6745 * This function attempts to return a received frame from the
6746 * receive DMA buffers when running in external loop mode. In this mode,
6747 * we will return at most one DMABUFFERSIZE frame to the application.
6748 * The USC receiver is triggering off of DCD going active to start a new
6749 * frame, and DCD going inactive to terminate the frame (similar to
6750 * processing a closing flag character).
6752 * In this routine, we will return DMABUFFERSIZE "chunks" at a time.
6753 * If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
6754 * status field and the RCC field will indicate the length of the
6755 * entire received frame. We take this RCC field and get the modulus
6756 * of RCC and DMABUFFERSIZE to determine if number of bytes in the
6757 * last Rx DMA buffer and return that last portion of the frame.
6759 * Arguments: info pointer to device extension
6760 * Return Value: true if frame returned, otherwise false
6762 static bool mgsl_get_raw_rx_frame(struct mgsl_struct *info)
6764 unsigned int CurrentIndex, NextIndex;
6765 unsigned short status;
6766 DMABUFFERENTRY *pBufEntry;
6767 unsigned int framesize = 0;
6768 bool ReturnCode = false;
6769 unsigned long flags;
6770 struct tty_struct *tty = info->port.tty;
6773 * current_rx_buffer points to the 1st buffer of the next available
6774 * receive frame. The status field is set by the 16C32 after
6775 * completing a receive frame. If the status field of this buffer
6776 * is zero, either the USC is still filling this buffer or this
6777 * is one of a series of buffers making up a received frame.
6779 * If the count field of this buffer is zero, the USC is either
6780 * using this buffer or has used this buffer. Look at the count
6781 * field of the next buffer. If that next buffer's count is
6782 * non-zero, the USC is still actively using the current buffer.
6783 * Otherwise, if the next buffer's count field is zero, the
6784 * current buffer is complete and the USC is using the next
6787 CurrentIndex = NextIndex = info->current_rx_buffer;
6789 if ( NextIndex == info->rx_buffer_count )
6792 if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
6793 (info->rx_buffer_list[CurrentIndex].count == 0 &&
6794 info->rx_buffer_list[NextIndex].count == 0)) {
6796 * Either the status field of this dma buffer is non-zero
6797 * (indicating the last buffer of a receive frame) or the next
6798 * buffer is marked as in use -- implying this buffer is complete
6799 * and an intermediate buffer for this received frame.
6802 status = info->rx_buffer_list[CurrentIndex].status;
6804 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6805 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6806 if ( status & RXSTATUS_SHORT_FRAME )
6807 info->icount.rxshort++;
6808 else if ( status & RXSTATUS_ABORT )
6809 info->icount.rxabort++;
6810 else if ( status & RXSTATUS_OVERRUN )
6811 info->icount.rxover++;
6813 info->icount.rxcrc++;
6817 * A receive frame is available, get frame size and status.
6819 * The frame size is the starting value of the RCC (which was
6820 * set to 0xffff) minus the ending value of the RCC (decremented
6821 * once for each receive character) minus 2 or 4 for the 16-bit
6824 * If the status field is zero, this is an intermediate buffer.
6827 * If the DMA Buffer Entry's Status field is non-zero, the
6828 * receive operation completed normally (ie: DCD dropped). The
6829 * RCC field is valid and holds the received frame size.
6830 * It is possible that the RCC field will be zero on a DMA buffer
6831 * entry with a non-zero status. This can occur if the total
6832 * frame size (number of bytes between the time DCD goes active
6833 * to the time DCD goes inactive) exceeds 65535 bytes. In this
6834 * case the 16C32 has underrun on the RCC count and appears to
6835 * stop updating this counter to let us know the actual received
6836 * frame size. If this happens (non-zero status and zero RCC),
6837 * simply return the entire RxDMA Buffer
6841 * In the event that the final RxDMA Buffer is
6842 * terminated with a non-zero status and the RCC
6843 * field is zero, we interpret this as the RCC
6844 * having underflowed (received frame > 65535 bytes).
6846 * Signal the event to the user by passing back
6847 * a status of RxStatus_CrcError returning the full
6848 * buffer and let the app figure out what data is
6851 if ( info->rx_buffer_list[CurrentIndex].rcc )
6852 framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
6854 framesize = DMABUFFERSIZE;
6857 framesize = DMABUFFERSIZE;
6860 if ( framesize > DMABUFFERSIZE ) {
6862 * if running in raw sync mode, ISR handler for
6863 * End Of Buffer events terminates all buffers at 4K.
6864 * If this frame size is said to be >4K, get the
6865 * actual number of bytes of the frame in this buffer.
6867 framesize = framesize % DMABUFFERSIZE;
6871 if ( debug_level >= DEBUG_LEVEL_BH )
6872 printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
6873 __FILE__,__LINE__,info->device_name,status,framesize);
6875 if ( debug_level >= DEBUG_LEVEL_DATA )
6876 mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
6877 min_t(int, framesize, DMABUFFERSIZE),0);
6880 /* copy dma buffer(s) to contiguous intermediate buffer */
6881 /* NOTE: we never copy more than DMABUFFERSIZE bytes */
6883 pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
6884 memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
6885 info->icount.rxok++;
6887 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6890 /* Free the buffers used by this frame. */
6891 mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
6897 if ( info->rx_enabled && info->rx_overflow ) {
6898 /* The receiver needs to restarted because of
6899 * a receive overflow (buffer or FIFO). If the
6900 * receive buffers are now empty, then restart receiver.
6903 if ( !info->rx_buffer_list[CurrentIndex].status &&
6904 info->rx_buffer_list[CurrentIndex].count ) {
6905 spin_lock_irqsave(&info->irq_spinlock,flags);
6906 usc_start_receiver(info);
6907 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6913 } /* end of mgsl_get_raw_rx_frame() */
6915 /* mgsl_load_tx_dma_buffer()
6917 * Load the transmit DMA buffer with the specified data.
6921 * info pointer to device extension
6922 * Buffer pointer to buffer containing frame to load
6923 * BufferSize size in bytes of frame in Buffer
6925 * Return Value: None
6927 static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
6928 const char *Buffer, unsigned int BufferSize)
6930 unsigned short Copycount;
6932 DMABUFFERENTRY *pBufEntry;
6934 if ( debug_level >= DEBUG_LEVEL_DATA )
6935 mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
6937 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
6938 /* set CMR:13 to start transmit when
6939 * next GoAhead (abort) is received
6941 info->cmr_value |= BIT13;
6944 /* begin loading the frame in the next available tx dma
6945 * buffer, remember it's starting location for setting
6946 * up tx dma operation
6948 i = info->current_tx_buffer;
6949 info->start_tx_dma_buffer = i;
6951 /* Setup the status and RCC (Frame Size) fields of the 1st */
6952 /* buffer entry in the transmit DMA buffer list. */
6954 info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
6955 info->tx_buffer_list[i].rcc = BufferSize;
6956 info->tx_buffer_list[i].count = BufferSize;
6958 /* Copy frame data from 1st source buffer to the DMA buffers. */
6959 /* The frame data may span multiple DMA buffers. */
6961 while( BufferSize ){
6962 /* Get a pointer to next DMA buffer entry. */
6963 pBufEntry = &info->tx_buffer_list[i++];
6965 if ( i == info->tx_buffer_count )
6968 /* Calculate the number of bytes that can be copied from */
6969 /* the source buffer to this DMA buffer. */
6970 if ( BufferSize > DMABUFFERSIZE )
6971 Copycount = DMABUFFERSIZE;
6973 Copycount = BufferSize;
6975 /* Actually copy data from source buffer to DMA buffer. */
6976 /* Also set the data count for this individual DMA buffer. */
6977 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6978 mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
6980 memcpy(pBufEntry->virt_addr, Buffer, Copycount);
6982 pBufEntry->count = Copycount;
6984 /* Advance source pointer and reduce remaining data count. */
6985 Buffer += Copycount;
6986 BufferSize -= Copycount;
6988 ++info->tx_dma_buffers_used;
6991 /* remember next available tx dma buffer */
6992 info->current_tx_buffer = i;
6994 } /* end of mgsl_load_tx_dma_buffer() */
6997 * mgsl_register_test()
6999 * Performs a register test of the 16C32.
7001 * Arguments: info pointer to device instance data
7002 * Return Value: true if test passed, otherwise false
7004 static bool mgsl_register_test( struct mgsl_struct *info )
7006 static unsigned short BitPatterns[] =
7007 { 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
7008 static unsigned int Patterncount = ARRAY_SIZE(BitPatterns);
7011 unsigned long flags;
7013 spin_lock_irqsave(&info->irq_spinlock,flags);
7016 /* Verify the reset state of some registers. */
7018 if ( (usc_InReg( info, SICR ) != 0) ||
7019 (usc_InReg( info, IVR ) != 0) ||
7020 (usc_InDmaReg( info, DIVR ) != 0) ){
7025 /* Write bit patterns to various registers but do it out of */
7026 /* sync, then read back and verify values. */
7028 for ( i = 0 ; i < Patterncount ; i++ ) {
7029 usc_OutReg( info, TC0R, BitPatterns[i] );
7030 usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
7031 usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
7032 usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
7033 usc_OutReg( info, RSR, BitPatterns[(i+4)%Patterncount] );
7034 usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
7036 if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
7037 (usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
7038 (usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
7039 (usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
7040 (usc_InReg( info, RSR ) != BitPatterns[(i+4)%Patterncount]) ||
7041 (usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
7049 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7053 } /* end of mgsl_register_test() */
7055 /* mgsl_irq_test() Perform interrupt test of the 16C32.
7057 * Arguments: info pointer to device instance data
7058 * Return Value: true if test passed, otherwise false
7060 static bool mgsl_irq_test( struct mgsl_struct *info )
7062 unsigned long EndTime;
7063 unsigned long flags;
7065 spin_lock_irqsave(&info->irq_spinlock,flags);
7069 * Setup 16C32 to interrupt on TxC pin (14MHz clock) transition.
7070 * The ISR sets irq_occurred to true.
7073 info->irq_occurred = false;
7075 /* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
7076 /* Enable INTEN (Port 6, Bit12) */
7077 /* This connects the IRQ request signal to the ISA bus */
7078 /* on the ISA adapter. This has no effect for the PCI adapter */
7079 usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
7081 usc_EnableMasterIrqBit(info);
7082 usc_EnableInterrupts(info, IO_PIN);
7083 usc_ClearIrqPendingBits(info, IO_PIN);
7085 usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
7086 usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
7088 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7091 while( EndTime-- && !info->irq_occurred ) {
7092 msleep_interruptible(10);
7095 spin_lock_irqsave(&info->irq_spinlock,flags);
7097 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7099 return info->irq_occurred;
7101 } /* end of mgsl_irq_test() */
7105 * Perform a DMA test of the 16C32. A small frame is
7106 * transmitted via DMA from a transmit buffer to a receive buffer
7107 * using single buffer DMA mode.
7109 * Arguments: info pointer to device instance data
7110 * Return Value: true if test passed, otherwise false
7112 static bool mgsl_dma_test( struct mgsl_struct *info )
7114 unsigned short FifoLevel;
7115 unsigned long phys_addr;
7116 unsigned int FrameSize;
7120 unsigned short status=0;
7121 unsigned long EndTime;
7122 unsigned long flags;
7123 MGSL_PARAMS tmp_params;
7125 /* save current port options */
7126 memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
7127 /* load default port options */
7128 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
7130 #define TESTFRAMESIZE 40
7132 spin_lock_irqsave(&info->irq_spinlock,flags);
7134 /* setup 16C32 for SDLC DMA transfer mode */
7137 usc_set_sdlc_mode(info);
7138 usc_enable_loopback(info,1);
7140 /* Reprogram the RDMR so that the 16C32 does NOT clear the count
7141 * field of the buffer entry after fetching buffer address. This
7142 * way we can detect a DMA failure for a DMA read (which should be
7143 * non-destructive to system memory) before we try and write to
7144 * memory (where a failure could corrupt system memory).
7147 /* Receive DMA mode Register (RDMR)
7149 * <15..14> 11 DMA mode = Linked List Buffer mode
7150 * <13> 1 RSBinA/L = store Rx status Block in List entry
7151 * <12> 0 1 = Clear count of List Entry after fetching
7152 * <11..10> 00 Address mode = Increment
7153 * <9> 1 Terminate Buffer on RxBound
7154 * <8> 0 Bus Width = 16bits
7155 * <7..0> ? status Bits (write as 0s)
7157 * 1110 0010 0000 0000 = 0xe200
7160 usc_OutDmaReg( info, RDMR, 0xe200 );
7162 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7165 /* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
7167 FrameSize = TESTFRAMESIZE;
7169 /* setup 1st transmit buffer entry: */
7170 /* with frame size and transmit control word */
7172 info->tx_buffer_list[0].count = FrameSize;
7173 info->tx_buffer_list[0].rcc = FrameSize;
7174 info->tx_buffer_list[0].status = 0x4000;
7176 /* build a transmit frame in 1st transmit DMA buffer */
7178 TmpPtr = info->tx_buffer_list[0].virt_addr;
7179 for (i = 0; i < FrameSize; i++ )
7182 /* setup 1st receive buffer entry: */
7183 /* clear status, set max receive buffer size */
7185 info->rx_buffer_list[0].status = 0;
7186 info->rx_buffer_list[0].count = FrameSize + 4;
7188 /* zero out the 1st receive buffer */
7190 memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
7192 /* Set count field of next buffer entries to prevent */
7193 /* 16C32 from using buffers after the 1st one. */
7195 info->tx_buffer_list[1].count = 0;
7196 info->rx_buffer_list[1].count = 0;
7199 /***************************/
7200 /* Program 16C32 receiver. */
7201 /***************************/
7203 spin_lock_irqsave(&info->irq_spinlock,flags);
7205 /* setup DMA transfers */
7206 usc_RTCmd( info, RTCmd_PurgeRxFifo );
7208 /* program 16C32 receiver with physical address of 1st DMA buffer entry */
7209 phys_addr = info->rx_buffer_list[0].phys_entry;
7210 usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
7211 usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
7213 /* Clear the Rx DMA status bits (read RDMR) and start channel */
7214 usc_InDmaReg( info, RDMR );
7215 usc_DmaCmd( info, DmaCmd_InitRxChannel );
7217 /* Enable Receiver (RMR <1..0> = 10) */
7218 usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
7220 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7223 /*************************************************************/
7224 /* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
7225 /*************************************************************/
7227 /* Wait 100ms for interrupt. */
7228 EndTime = jiffies + msecs_to_jiffies(100);
7231 if (time_after(jiffies, EndTime)) {
7236 spin_lock_irqsave(&info->irq_spinlock,flags);
7237 status = usc_InDmaReg( info, RDMR );
7238 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7240 if ( !(status & BIT4) && (status & BIT5) ) {
7241 /* INITG (BIT 4) is inactive (no entry read in progress) AND */
7242 /* BUSY (BIT 5) is active (channel still active). */
7243 /* This means the buffer entry read has completed. */
7249 /******************************/
7250 /* Program 16C32 transmitter. */
7251 /******************************/
7253 spin_lock_irqsave(&info->irq_spinlock,flags);
7255 /* Program the Transmit Character Length Register (TCLR) */
7256 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
7258 usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
7259 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7261 /* Program the address of the 1st DMA Buffer Entry in linked list */
7263 phys_addr = info->tx_buffer_list[0].phys_entry;
7264 usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
7265 usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
7267 /* unlatch Tx status bits, and start transmit channel. */
7269 usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
7270 usc_DmaCmd( info, DmaCmd_InitTxChannel );
7272 /* wait for DMA controller to fill transmit FIFO */
7274 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
7276 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7279 /**********************************/
7280 /* WAIT FOR TRANSMIT FIFO TO FILL */
7281 /**********************************/
7284 EndTime = jiffies + msecs_to_jiffies(100);
7287 if (time_after(jiffies, EndTime)) {
7292 spin_lock_irqsave(&info->irq_spinlock,flags);
7293 FifoLevel = usc_InReg(info, TICR) >> 8;
7294 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7296 if ( FifoLevel < 16 )
7299 if ( FrameSize < 32 ) {
7300 /* This frame is smaller than the entire transmit FIFO */
7301 /* so wait for the entire frame to be loaded. */
7302 if ( FifoLevel <= (32 - FrameSize) )
7310 /* Enable 16C32 transmitter. */
7312 spin_lock_irqsave(&info->irq_spinlock,flags);
7314 /* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
7315 usc_TCmd( info, TCmd_SendFrame );
7316 usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
7318 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7321 /******************************/
7322 /* WAIT FOR TRANSMIT COMPLETE */
7323 /******************************/
7326 EndTime = jiffies + msecs_to_jiffies(100);
7328 /* While timer not expired wait for transmit complete */
7330 spin_lock_irqsave(&info->irq_spinlock,flags);
7331 status = usc_InReg( info, TCSR );
7332 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7334 while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
7335 if (time_after(jiffies, EndTime)) {
7340 spin_lock_irqsave(&info->irq_spinlock,flags);
7341 status = usc_InReg( info, TCSR );
7342 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7348 /* CHECK FOR TRANSMIT ERRORS */
7349 if ( status & (BIT5 + BIT1) )
7354 /* WAIT FOR RECEIVE COMPLETE */
7357 EndTime = jiffies + msecs_to_jiffies(100);
7359 /* Wait for 16C32 to write receive status to buffer entry. */
7360 status=info->rx_buffer_list[0].status;
7361 while ( status == 0 ) {
7362 if (time_after(jiffies, EndTime)) {
7366 status=info->rx_buffer_list[0].status;
7372 /* CHECK FOR RECEIVE ERRORS */
7373 status = info->rx_buffer_list[0].status;
7375 if ( status & (BIT8 + BIT3 + BIT1) ) {
7376 /* receive error has occurred */
7379 if ( memcmp( info->tx_buffer_list[0].virt_addr ,
7380 info->rx_buffer_list[0].virt_addr, FrameSize ) ){
7386 spin_lock_irqsave(&info->irq_spinlock,flags);
7388 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7390 /* restore current port options */
7391 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
7395 } /* end of mgsl_dma_test() */
7397 /* mgsl_adapter_test()
7399 * Perform the register, IRQ, and DMA tests for the 16C32.
7401 * Arguments: info pointer to device instance data
7402 * Return Value: 0 if success, otherwise -ENODEV
7404 static int mgsl_adapter_test( struct mgsl_struct *info )
7406 if ( debug_level >= DEBUG_LEVEL_INFO )
7407 printk( "%s(%d):Testing device %s\n",
7408 __FILE__,__LINE__,info->device_name );
7410 if ( !mgsl_register_test( info ) ) {
7411 info->init_error = DiagStatus_AddressFailure;
7412 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
7413 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
7417 if ( !mgsl_irq_test( info ) ) {
7418 info->init_error = DiagStatus_IrqFailure;
7419 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
7420 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
7424 if ( !mgsl_dma_test( info ) ) {
7425 info->init_error = DiagStatus_DmaFailure;
7426 printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
7427 __FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
7431 if ( debug_level >= DEBUG_LEVEL_INFO )
7432 printk( "%s(%d):device %s passed diagnostics\n",
7433 __FILE__,__LINE__,info->device_name );
7437 } /* end of mgsl_adapter_test() */
7439 /* mgsl_memory_test()
7441 * Test the shared memory on a PCI adapter.
7443 * Arguments: info pointer to device instance data
7444 * Return Value: true if test passed, otherwise false
7446 static bool mgsl_memory_test( struct mgsl_struct *info )
7448 static unsigned long BitPatterns[] =
7449 { 0x0, 0x55555555, 0xaaaaaaaa, 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
7450 unsigned long Patterncount = ARRAY_SIZE(BitPatterns);
7452 unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
7453 unsigned long * TestAddr;
7455 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
7458 TestAddr = (unsigned long *)info->memory_base;
7460 /* Test data lines with test pattern at one location. */
7462 for ( i = 0 ; i < Patterncount ; i++ ) {
7463 *TestAddr = BitPatterns[i];
7464 if ( *TestAddr != BitPatterns[i] )
7468 /* Test address lines with incrementing pattern over */
7469 /* entire address range. */
7471 for ( i = 0 ; i < TestLimit ; i++ ) {
7476 TestAddr = (unsigned long *)info->memory_base;
7478 for ( i = 0 ; i < TestLimit ; i++ ) {
7479 if ( *TestAddr != i * 4 )
7484 memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
7488 } /* End Of mgsl_memory_test() */
7491 /* mgsl_load_pci_memory()
7493 * Load a large block of data into the PCI shared memory.
7494 * Use this instead of memcpy() or memmove() to move data
7495 * into the PCI shared memory.
7499 * This function prevents the PCI9050 interface chip from hogging
7500 * the adapter local bus, which can starve the 16C32 by preventing
7501 * 16C32 bus master cycles.
7503 * The PCI9050 documentation says that the 9050 will always release
7504 * control of the local bus after completing the current read
7505 * or write operation.
7507 * It appears that as long as the PCI9050 write FIFO is full, the
7508 * PCI9050 treats all of the writes as a single burst transaction
7509 * and will not release the bus. This causes DMA latency problems
7510 * at high speeds when copying large data blocks to the shared
7513 * This function in effect, breaks the a large shared memory write
7514 * into multiple transations by interleaving a shared memory read
7515 * which will flush the write FIFO and 'complete' the write
7516 * transation. This allows any pending DMA request to gain control
7517 * of the local bus in a timely fasion.
7521 * TargetPtr pointer to target address in PCI shared memory
7522 * SourcePtr pointer to source buffer for data
7523 * count count in bytes of data to copy
7525 * Return Value: None
7527 static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
7528 unsigned short count )
7530 /* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
7531 #define PCI_LOAD_INTERVAL 64
7533 unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
7534 unsigned short Index;
7535 unsigned long Dummy;
7537 for ( Index = 0 ; Index < Intervalcount ; Index++ )
7539 memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
7540 Dummy = *((volatile unsigned long *)TargetPtr);
7541 TargetPtr += PCI_LOAD_INTERVAL;
7542 SourcePtr += PCI_LOAD_INTERVAL;
7545 memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
7547 } /* End Of mgsl_load_pci_memory() */
7549 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
7554 printk("%s tx data:\n",info->device_name);
7556 printk("%s rx data:\n",info->device_name);
7564 for(i=0;i<linecount;i++)
7565 printk("%02X ",(unsigned char)data[i]);
7568 for(i=0;i<linecount;i++) {
7569 if (data[i]>=040 && data[i]<=0176)
7570 printk("%c",data[i]);
7579 } /* end of mgsl_trace_block() */
7581 /* mgsl_tx_timeout()
7583 * called when HDLC frame times out
7584 * update stats and do tx completion processing
7586 * Arguments: context pointer to device instance data
7587 * Return Value: None
7589 static void mgsl_tx_timeout(unsigned long context)
7591 struct mgsl_struct *info = (struct mgsl_struct*)context;
7592 unsigned long flags;
7594 if ( debug_level >= DEBUG_LEVEL_INFO )
7595 printk( "%s(%d):mgsl_tx_timeout(%s)\n",
7596 __FILE__,__LINE__,info->device_name);
7597 if(info->tx_active &&
7598 (info->params.mode == MGSL_MODE_HDLC ||
7599 info->params.mode == MGSL_MODE_RAW) ) {
7600 info->icount.txtimeout++;
7602 spin_lock_irqsave(&info->irq_spinlock,flags);
7603 info->tx_active = false;
7604 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
7606 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
7607 usc_loopmode_cancel_transmit( info );
7609 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7611 #if SYNCLINK_GENERIC_HDLC
7613 hdlcdev_tx_done(info);
7616 mgsl_bh_transmit(info);
7618 } /* end of mgsl_tx_timeout() */
7620 /* signal that there are no more frames to send, so that
7621 * line is 'released' by echoing RxD to TxD when current
7622 * transmission is complete (or immediately if no tx in progress).
7624 static int mgsl_loopmode_send_done( struct mgsl_struct * info )
7626 unsigned long flags;
7628 spin_lock_irqsave(&info->irq_spinlock,flags);
7629 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
7630 if (info->tx_active)
7631 info->loopmode_send_done_requested = true;
7633 usc_loopmode_send_done(info);
7635 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7640 /* release the line by echoing RxD to TxD
7641 * upon completion of a transmit frame
7643 static void usc_loopmode_send_done( struct mgsl_struct * info )
7645 info->loopmode_send_done_requested = false;
7646 /* clear CMR:13 to 0 to start echoing RxData to TxData */
7647 info->cmr_value &= ~BIT13;
7648 usc_OutReg(info, CMR, info->cmr_value);
7651 /* abort a transmit in progress while in HDLC LoopMode
7653 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
7655 /* reset tx dma channel and purge TxFifo */
7656 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7657 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
7658 usc_loopmode_send_done( info );
7661 /* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
7662 * is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
7663 * we must clear CMR:13 to begin repeating TxData to RxData
7665 static void usc_loopmode_insert_request( struct mgsl_struct * info )
7667 info->loopmode_insert_requested = true;
7669 /* enable RxAbort irq. On next RxAbort, clear CMR:13 to
7670 * begin repeating TxData on RxData (complete insertion)
7672 usc_OutReg( info, RICR,
7673 (usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
7675 /* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
7676 info->cmr_value |= BIT13;
7677 usc_OutReg(info, CMR, info->cmr_value);
7680 /* return 1 if station is inserted into the loop, otherwise 0
7682 static int usc_loopmode_active( struct mgsl_struct * info)
7684 return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
7687 #if SYNCLINK_GENERIC_HDLC
7690 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
7691 * set encoding and frame check sequence (FCS) options
7693 * dev pointer to network device structure
7694 * encoding serial encoding setting
7695 * parity FCS setting
7697 * returns 0 if success, otherwise error code
7699 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
7700 unsigned short parity)
7702 struct mgsl_struct *info = dev_to_port(dev);
7703 unsigned char new_encoding;
7704 unsigned short new_crctype;
7706 /* return error if TTY interface open */
7707 if (info->port.count)
7712 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
7713 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
7714 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
7715 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
7716 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
7717 default: return -EINVAL;
7722 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
7723 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
7724 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
7725 default: return -EINVAL;
7728 info->params.encoding = new_encoding;
7729 info->params.crc_type = new_crctype;
7731 /* if network interface up, reprogram hardware */
7733 mgsl_program_hw(info);
7739 * called by generic HDLC layer to send frame
7741 * skb socket buffer containing HDLC frame
7742 * dev pointer to network device structure
7744 * returns 0 if success, otherwise error code
7746 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
7748 struct mgsl_struct *info = dev_to_port(dev);
7749 struct net_device_stats *stats = hdlc_stats(dev);
7750 unsigned long flags;
7752 if (debug_level >= DEBUG_LEVEL_INFO)
7753 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
7755 /* stop sending until this frame completes */
7756 netif_stop_queue(dev);
7758 /* copy data to device buffers */
7759 info->xmit_cnt = skb->len;
7760 mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
7762 /* update network statistics */
7763 stats->tx_packets++;
7764 stats->tx_bytes += skb->len;
7766 /* done with socket buffer, so free it */
7769 /* save start time for transmit timeout detection */
7770 dev->trans_start = jiffies;
7772 /* start hardware transmitter if necessary */
7773 spin_lock_irqsave(&info->irq_spinlock,flags);
7774 if (!info->tx_active)
7775 usc_start_transmitter(info);
7776 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7782 * called by network layer when interface enabled
7783 * claim resources and initialize hardware
7785 * dev pointer to network device structure
7787 * returns 0 if success, otherwise error code
7789 static int hdlcdev_open(struct net_device *dev)
7791 struct mgsl_struct *info = dev_to_port(dev);
7793 unsigned long flags;
7795 if (debug_level >= DEBUG_LEVEL_INFO)
7796 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
7798 /* generic HDLC layer open processing */
7799 if ((rc = hdlc_open(dev)))
7802 /* arbitrate between network and tty opens */
7803 spin_lock_irqsave(&info->netlock, flags);
7804 if (info->port.count != 0 || info->netcount != 0) {
7805 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
7806 spin_unlock_irqrestore(&info->netlock, flags);
7810 spin_unlock_irqrestore(&info->netlock, flags);
7812 /* claim resources and init adapter */
7813 if ((rc = startup(info)) != 0) {
7814 spin_lock_irqsave(&info->netlock, flags);
7816 spin_unlock_irqrestore(&info->netlock, flags);
7820 /* assert DTR and RTS, apply hardware settings */
7821 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
7822 mgsl_program_hw(info);
7824 /* enable network layer transmit */
7825 dev->trans_start = jiffies;
7826 netif_start_queue(dev);
7828 /* inform generic HDLC layer of current DCD status */
7829 spin_lock_irqsave(&info->irq_spinlock, flags);
7830 usc_get_serial_signals(info);
7831 spin_unlock_irqrestore(&info->irq_spinlock, flags);
7832 if (info->serial_signals & SerialSignal_DCD)
7833 netif_carrier_on(dev);
7835 netif_carrier_off(dev);
7840 * called by network layer when interface is disabled
7841 * shutdown hardware and release resources
7843 * dev pointer to network device structure
7845 * returns 0 if success, otherwise error code
7847 static int hdlcdev_close(struct net_device *dev)
7849 struct mgsl_struct *info = dev_to_port(dev);
7850 unsigned long flags;
7852 if (debug_level >= DEBUG_LEVEL_INFO)
7853 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
7855 netif_stop_queue(dev);
7857 /* shutdown adapter and release resources */
7862 spin_lock_irqsave(&info->netlock, flags);
7864 spin_unlock_irqrestore(&info->netlock, flags);
7870 * called by network layer to process IOCTL call to network device
7872 * dev pointer to network device structure
7873 * ifr pointer to network interface request structure
7874 * cmd IOCTL command code
7876 * returns 0 if success, otherwise error code
7878 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
7880 const size_t size = sizeof(sync_serial_settings);
7881 sync_serial_settings new_line;
7882 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
7883 struct mgsl_struct *info = dev_to_port(dev);
7886 if (debug_level >= DEBUG_LEVEL_INFO)
7887 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
7889 /* return error if TTY interface open */
7890 if (info->port.count)
7893 if (cmd != SIOCWANDEV)
7894 return hdlc_ioctl(dev, ifr, cmd);
7896 switch(ifr->ifr_settings.type) {
7897 case IF_GET_IFACE: /* return current sync_serial_settings */
7899 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
7900 if (ifr->ifr_settings.size < size) {
7901 ifr->ifr_settings.size = size; /* data size wanted */
7905 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7906 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7907 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7908 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7911 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
7912 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
7913 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
7914 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
7915 default: new_line.clock_type = CLOCK_DEFAULT;
7918 new_line.clock_rate = info->params.clock_speed;
7919 new_line.loopback = info->params.loopback ? 1:0;
7921 if (copy_to_user(line, &new_line, size))
7925 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
7927 if(!capable(CAP_NET_ADMIN))
7929 if (copy_from_user(&new_line, line, size))
7932 switch (new_line.clock_type)
7934 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
7935 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
7936 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
7937 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
7938 case CLOCK_DEFAULT: flags = info->params.flags &
7939 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7940 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7941 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7942 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
7943 default: return -EINVAL;
7946 if (new_line.loopback != 0 && new_line.loopback != 1)
7949 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7950 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7951 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7952 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7953 info->params.flags |= flags;
7955 info->params.loopback = new_line.loopback;
7957 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
7958 info->params.clock_speed = new_line.clock_rate;
7960 info->params.clock_speed = 0;
7962 /* if network interface up, reprogram hardware */
7964 mgsl_program_hw(info);
7968 return hdlc_ioctl(dev, ifr, cmd);
7973 * called by network layer when transmit timeout is detected
7975 * dev pointer to network device structure
7977 static void hdlcdev_tx_timeout(struct net_device *dev)
7979 struct mgsl_struct *info = dev_to_port(dev);
7980 struct net_device_stats *stats = hdlc_stats(dev);
7981 unsigned long flags;
7983 if (debug_level >= DEBUG_LEVEL_INFO)
7984 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
7987 stats->tx_aborted_errors++;
7989 spin_lock_irqsave(&info->irq_spinlock,flags);
7990 usc_stop_transmitter(info);
7991 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7993 netif_wake_queue(dev);
7997 * called by device driver when transmit completes
7998 * reenable network layer transmit if stopped
8000 * info pointer to device instance information
8002 static void hdlcdev_tx_done(struct mgsl_struct *info)
8004 if (netif_queue_stopped(info->netdev))
8005 netif_wake_queue(info->netdev);
8009 * called by device driver when frame received
8010 * pass frame to network layer
8012 * info pointer to device instance information
8013 * buf pointer to buffer contianing frame data
8014 * size count of data bytes in buf
8016 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
8018 struct sk_buff *skb = dev_alloc_skb(size);
8019 struct net_device *dev = info->netdev;
8020 struct net_device_stats *stats = hdlc_stats(dev);
8022 if (debug_level >= DEBUG_LEVEL_INFO)
8023 printk("hdlcdev_rx(%s)\n",dev->name);
8026 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
8027 stats->rx_dropped++;
8031 memcpy(skb_put(skb, size),buf,size);
8033 skb->protocol = hdlc_type_trans(skb, info->netdev);
8035 stats->rx_packets++;
8036 stats->rx_bytes += size;
8040 info->netdev->last_rx = jiffies;
8044 * called by device driver when adding device instance
8045 * do generic HDLC initialization
8047 * info pointer to device instance information
8049 * returns 0 if success, otherwise error code
8051 static int hdlcdev_init(struct mgsl_struct *info)
8054 struct net_device *dev;
8057 /* allocate and initialize network and HDLC layer objects */
8059 if (!(dev = alloc_hdlcdev(info))) {
8060 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
8064 /* for network layer reporting purposes only */
8065 dev->base_addr = info->io_base;
8066 dev->irq = info->irq_level;
8067 dev->dma = info->dma_level;
8069 /* network layer callbacks and settings */
8070 dev->do_ioctl = hdlcdev_ioctl;
8071 dev->open = hdlcdev_open;
8072 dev->stop = hdlcdev_close;
8073 dev->tx_timeout = hdlcdev_tx_timeout;
8074 dev->watchdog_timeo = 10*HZ;
8075 dev->tx_queue_len = 50;
8077 /* generic HDLC layer callbacks and settings */
8078 hdlc = dev_to_hdlc(dev);
8079 hdlc->attach = hdlcdev_attach;
8080 hdlc->xmit = hdlcdev_xmit;
8082 /* register objects with HDLC layer */
8083 if ((rc = register_hdlc_device(dev))) {
8084 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
8094 * called by device driver when removing device instance
8095 * do generic HDLC cleanup
8097 * info pointer to device instance information
8099 static void hdlcdev_exit(struct mgsl_struct *info)
8101 unregister_hdlc_device(info->netdev);
8102 free_netdev(info->netdev);
8103 info->netdev = NULL;
8106 #endif /* CONFIG_HDLC */
8109 static int __devinit synclink_init_one (struct pci_dev *dev,
8110 const struct pci_device_id *ent)
8112 struct mgsl_struct *info;
8114 if (pci_enable_device(dev)) {
8115 printk("error enabling pci device %p\n", dev);
8119 if (!(info = mgsl_allocate_device())) {
8120 printk("can't allocate device instance data.\n");
8124 /* Copy user configuration info to device instance data */
8126 info->io_base = pci_resource_start(dev, 2);
8127 info->irq_level = dev->irq;
8128 info->phys_memory_base = pci_resource_start(dev, 3);
8130 /* Because veremap only works on page boundaries we must map
8131 * a larger area than is actually implemented for the LCR
8132 * memory range. We map a full page starting at the page boundary.
8134 info->phys_lcr_base = pci_resource_start(dev, 0);
8135 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
8136 info->phys_lcr_base &= ~(PAGE_SIZE-1);
8138 info->bus_type = MGSL_BUS_TYPE_PCI;
8139 info->io_addr_size = 8;
8140 info->irq_flags = IRQF_SHARED;
8142 if (dev->device == 0x0210) {
8143 /* Version 1 PCI9030 based universal PCI adapter */
8144 info->misc_ctrl_value = 0x007c4080;
8145 info->hw_version = 1;
8147 /* Version 0 PCI9050 based 5V PCI adapter
8148 * A PCI9050 bug prevents reading LCR registers if
8149 * LCR base address bit 7 is set. Maintain shadow
8150 * value so we can write to LCR misc control reg.
8152 info->misc_ctrl_value = 0x087e4546;
8153 info->hw_version = 0;
8156 mgsl_add_device(info);
8161 static void __devexit synclink_remove_one (struct pci_dev *dev)