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
184 int count; /* count of opens */
187 unsigned short close_delay;
188 unsigned short closing_wait; /* time to wait before closing */
190 struct mgsl_icount icount;
192 struct tty_struct *tty;
194 int x_char; /* xon/xoff character */
195 int blocked_open; /* # of blocked opens */
196 u16 read_status_mask;
197 u16 ignore_status_mask;
198 unsigned char *xmit_buf;
203 wait_queue_head_t open_wait;
204 wait_queue_head_t close_wait;
206 wait_queue_head_t status_event_wait_q;
207 wait_queue_head_t event_wait_q;
208 struct timer_list tx_timer; /* HDLC transmit timeout timer */
209 struct mgsl_struct *next_device; /* device list link */
211 spinlock_t irq_spinlock; /* spinlock for synchronizing with ISR */
212 struct work_struct task; /* task structure for scheduling bh */
214 u32 EventMask; /* event trigger mask */
215 u32 RecordedEvents; /* pending events */
217 u32 max_frame_size; /* as set by device config */
221 bool bh_running; /* Protection from multiple */
225 int dcd_chkcount; /* check counts to prevent */
226 int cts_chkcount; /* too many IRQs if a signal */
227 int dsr_chkcount; /* is floating */
230 char *buffer_list; /* virtual address of Rx & Tx buffer lists */
231 u32 buffer_list_phys;
232 dma_addr_t buffer_list_dma_addr;
234 unsigned int rx_buffer_count; /* count of total allocated Rx buffers */
235 DMABUFFERENTRY *rx_buffer_list; /* list of receive buffer entries */
236 unsigned int current_rx_buffer;
238 int num_tx_dma_buffers; /* number of tx dma frames required */
239 int tx_dma_buffers_used;
240 unsigned int tx_buffer_count; /* count of total allocated Tx buffers */
241 DMABUFFERENTRY *tx_buffer_list; /* list of transmit buffer entries */
242 int start_tx_dma_buffer; /* tx dma buffer to start tx dma operation */
243 int current_tx_buffer; /* next tx dma buffer to be loaded */
245 unsigned char *intermediate_rxbuffer;
247 int num_tx_holding_buffers; /* number of tx holding buffer allocated */
248 int get_tx_holding_index; /* next tx holding buffer for adapter to load */
249 int put_tx_holding_index; /* next tx holding buffer to store user request */
250 int tx_holding_count; /* number of tx holding buffers waiting */
251 struct tx_holding_buffer tx_holding_buffers[MAX_TX_HOLDING_BUFFERS];
255 bool rx_rcc_underrun;
264 char device_name[25]; /* device instance name */
266 unsigned int bus_type; /* expansion bus type (ISA,EISA,PCI) */
267 unsigned char bus; /* expansion bus number (zero based) */
268 unsigned char function; /* PCI device number */
270 unsigned int io_base; /* base I/O address of adapter */
271 unsigned int io_addr_size; /* size of the I/O address range */
272 bool io_addr_requested; /* true if I/O address requested */
274 unsigned int irq_level; /* interrupt level */
275 unsigned long irq_flags;
276 bool irq_requested; /* true if IRQ requested */
278 unsigned int dma_level; /* DMA channel */
279 bool dma_requested; /* true if dma channel requested */
285 MGSL_PARAMS params; /* communications parameters */
287 unsigned char serial_signals; /* current serial signal states */
289 bool irq_occurred; /* for diagnostics use */
290 unsigned int init_error; /* Initialization startup error (DIAGS) */
291 int fDiagnosticsmode; /* Driver in Diagnostic mode? (DIAGS) */
294 unsigned char* memory_base; /* shared memory address (PCI only) */
295 u32 phys_memory_base;
296 bool shared_mem_requested;
298 unsigned char* lcr_base; /* local config registers (PCI only) */
301 bool lcr_mem_requested;
304 char flag_buf[MAX_ASYNC_BUFFER_SIZE];
305 char char_buf[MAX_ASYNC_BUFFER_SIZE];
306 bool drop_rts_on_tx_done;
308 bool loopmode_insert_requested;
309 bool loopmode_send_done_requested;
311 struct _input_signal_events input_signal_events;
313 /* generic HDLC device parts */
318 #if SYNCLINK_GENERIC_HDLC
319 struct net_device *netdev;
323 #define MGSL_MAGIC 0x5401
326 * The size of the serial xmit buffer is 1 page, or 4096 bytes
328 #ifndef SERIAL_XMIT_SIZE
329 #define SERIAL_XMIT_SIZE 4096
333 * These macros define the offsets used in calculating the
334 * I/O address of the specified USC registers.
338 #define DCPIN 2 /* Bit 1 of I/O address */
339 #define SDPIN 4 /* Bit 2 of I/O address */
341 #define DCAR 0 /* DMA command/address register */
342 #define CCAR SDPIN /* channel command/address register */
343 #define DATAREG DCPIN + SDPIN /* serial data register */
348 * These macros define the register address (ordinal number)
349 * used for writing address/value pairs to the USC.
352 #define CMR 0x02 /* Channel mode Register */
353 #define CCSR 0x04 /* Channel Command/status Register */
354 #define CCR 0x06 /* Channel Control Register */
355 #define PSR 0x08 /* Port status Register */
356 #define PCR 0x0a /* Port Control Register */
357 #define TMDR 0x0c /* Test mode Data Register */
358 #define TMCR 0x0e /* Test mode Control Register */
359 #define CMCR 0x10 /* Clock mode Control Register */
360 #define HCR 0x12 /* Hardware Configuration Register */
361 #define IVR 0x14 /* Interrupt Vector Register */
362 #define IOCR 0x16 /* Input/Output Control Register */
363 #define ICR 0x18 /* Interrupt Control Register */
364 #define DCCR 0x1a /* Daisy Chain Control Register */
365 #define MISR 0x1c /* Misc Interrupt status Register */
366 #define SICR 0x1e /* status Interrupt Control Register */
367 #define RDR 0x20 /* Receive Data Register */
368 #define RMR 0x22 /* Receive mode Register */
369 #define RCSR 0x24 /* Receive Command/status Register */
370 #define RICR 0x26 /* Receive Interrupt Control Register */
371 #define RSR 0x28 /* Receive Sync Register */
372 #define RCLR 0x2a /* Receive count Limit Register */
373 #define RCCR 0x2c /* Receive Character count Register */
374 #define TC0R 0x2e /* Time Constant 0 Register */
375 #define TDR 0x30 /* Transmit Data Register */
376 #define TMR 0x32 /* Transmit mode Register */
377 #define TCSR 0x34 /* Transmit Command/status Register */
378 #define TICR 0x36 /* Transmit Interrupt Control Register */
379 #define TSR 0x38 /* Transmit Sync Register */
380 #define TCLR 0x3a /* Transmit count Limit Register */
381 #define TCCR 0x3c /* Transmit Character count Register */
382 #define TC1R 0x3e /* Time Constant 1 Register */
386 * MACRO DEFINITIONS FOR DMA REGISTERS
389 #define DCR 0x06 /* DMA Control Register (shared) */
390 #define DACR 0x08 /* DMA Array count Register (shared) */
391 #define BDCR 0x12 /* Burst/Dwell Control Register (shared) */
392 #define DIVR 0x14 /* DMA Interrupt Vector Register (shared) */
393 #define DICR 0x18 /* DMA Interrupt Control Register (shared) */
394 #define CDIR 0x1a /* Clear DMA Interrupt Register (shared) */
395 #define SDIR 0x1c /* Set DMA Interrupt Register (shared) */
397 #define TDMR 0x02 /* Transmit DMA mode Register */
398 #define TDIAR 0x1e /* Transmit DMA Interrupt Arm Register */
399 #define TBCR 0x2a /* Transmit Byte count Register */
400 #define TARL 0x2c /* Transmit Address Register (low) */
401 #define TARU 0x2e /* Transmit Address Register (high) */
402 #define NTBCR 0x3a /* Next Transmit Byte count Register */
403 #define NTARL 0x3c /* Next Transmit Address Register (low) */
404 #define NTARU 0x3e /* Next Transmit Address Register (high) */
406 #define RDMR 0x82 /* Receive DMA mode Register (non-shared) */
407 #define RDIAR 0x9e /* Receive DMA Interrupt Arm Register */
408 #define RBCR 0xaa /* Receive Byte count Register */
409 #define RARL 0xac /* Receive Address Register (low) */
410 #define RARU 0xae /* Receive Address Register (high) */
411 #define NRBCR 0xba /* Next Receive Byte count Register */
412 #define NRARL 0xbc /* Next Receive Address Register (low) */
413 #define NRARU 0xbe /* Next Receive Address Register (high) */
417 * MACRO DEFINITIONS FOR MODEM STATUS BITS
420 #define MODEMSTATUS_DTR 0x80
421 #define MODEMSTATUS_DSR 0x40
422 #define MODEMSTATUS_RTS 0x20
423 #define MODEMSTATUS_CTS 0x10
424 #define MODEMSTATUS_RI 0x04
425 #define MODEMSTATUS_DCD 0x01
429 * Channel Command/Address Register (CCAR) Command Codes
432 #define RTCmd_Null 0x0000
433 #define RTCmd_ResetHighestIus 0x1000
434 #define RTCmd_TriggerChannelLoadDma 0x2000
435 #define RTCmd_TriggerRxDma 0x2800
436 #define RTCmd_TriggerTxDma 0x3000
437 #define RTCmd_TriggerRxAndTxDma 0x3800
438 #define RTCmd_PurgeRxFifo 0x4800
439 #define RTCmd_PurgeTxFifo 0x5000
440 #define RTCmd_PurgeRxAndTxFifo 0x5800
441 #define RTCmd_LoadRcc 0x6800
442 #define RTCmd_LoadTcc 0x7000
443 #define RTCmd_LoadRccAndTcc 0x7800
444 #define RTCmd_LoadTC0 0x8800
445 #define RTCmd_LoadTC1 0x9000
446 #define RTCmd_LoadTC0AndTC1 0x9800
447 #define RTCmd_SerialDataLSBFirst 0xa000
448 #define RTCmd_SerialDataMSBFirst 0xa800
449 #define RTCmd_SelectBigEndian 0xb000
450 #define RTCmd_SelectLittleEndian 0xb800
454 * DMA Command/Address Register (DCAR) Command Codes
457 #define DmaCmd_Null 0x0000
458 #define DmaCmd_ResetTxChannel 0x1000
459 #define DmaCmd_ResetRxChannel 0x1200
460 #define DmaCmd_StartTxChannel 0x2000
461 #define DmaCmd_StartRxChannel 0x2200
462 #define DmaCmd_ContinueTxChannel 0x3000
463 #define DmaCmd_ContinueRxChannel 0x3200
464 #define DmaCmd_PauseTxChannel 0x4000
465 #define DmaCmd_PauseRxChannel 0x4200
466 #define DmaCmd_AbortTxChannel 0x5000
467 #define DmaCmd_AbortRxChannel 0x5200
468 #define DmaCmd_InitTxChannel 0x7000
469 #define DmaCmd_InitRxChannel 0x7200
470 #define DmaCmd_ResetHighestDmaIus 0x8000
471 #define DmaCmd_ResetAllChannels 0x9000
472 #define DmaCmd_StartAllChannels 0xa000
473 #define DmaCmd_ContinueAllChannels 0xb000
474 #define DmaCmd_PauseAllChannels 0xc000
475 #define DmaCmd_AbortAllChannels 0xd000
476 #define DmaCmd_InitAllChannels 0xf000
478 #define TCmd_Null 0x0000
479 #define TCmd_ClearTxCRC 0x2000
480 #define TCmd_SelectTicrTtsaData 0x4000
481 #define TCmd_SelectTicrTxFifostatus 0x5000
482 #define TCmd_SelectTicrIntLevel 0x6000
483 #define TCmd_SelectTicrdma_level 0x7000
484 #define TCmd_SendFrame 0x8000
485 #define TCmd_SendAbort 0x9000
486 #define TCmd_EnableDleInsertion 0xc000
487 #define TCmd_DisableDleInsertion 0xd000
488 #define TCmd_ClearEofEom 0xe000
489 #define TCmd_SetEofEom 0xf000
491 #define RCmd_Null 0x0000
492 #define RCmd_ClearRxCRC 0x2000
493 #define RCmd_EnterHuntmode 0x3000
494 #define RCmd_SelectRicrRtsaData 0x4000
495 #define RCmd_SelectRicrRxFifostatus 0x5000
496 #define RCmd_SelectRicrIntLevel 0x6000
497 #define RCmd_SelectRicrdma_level 0x7000
500 * Bits for enabling and disabling IRQs in Interrupt Control Register (ICR)
503 #define RECEIVE_STATUS BIT5
504 #define RECEIVE_DATA BIT4
505 #define TRANSMIT_STATUS BIT3
506 #define TRANSMIT_DATA BIT2
512 * Receive status Bits in Receive Command/status Register RCSR
515 #define RXSTATUS_SHORT_FRAME BIT8
516 #define RXSTATUS_CODE_VIOLATION BIT8
517 #define RXSTATUS_EXITED_HUNT BIT7
518 #define RXSTATUS_IDLE_RECEIVED BIT6
519 #define RXSTATUS_BREAK_RECEIVED BIT5
520 #define RXSTATUS_ABORT_RECEIVED BIT5
521 #define RXSTATUS_RXBOUND BIT4
522 #define RXSTATUS_CRC_ERROR BIT3
523 #define RXSTATUS_FRAMING_ERROR BIT3
524 #define RXSTATUS_ABORT BIT2
525 #define RXSTATUS_PARITY_ERROR BIT2
526 #define RXSTATUS_OVERRUN BIT1
527 #define RXSTATUS_DATA_AVAILABLE BIT0
528 #define RXSTATUS_ALL 0x01f6
529 #define usc_UnlatchRxstatusBits(a,b) usc_OutReg( (a), RCSR, (u16)((b) & RXSTATUS_ALL) )
532 * Values for setting transmit idle mode in
533 * Transmit Control/status Register (TCSR)
535 #define IDLEMODE_FLAGS 0x0000
536 #define IDLEMODE_ALT_ONE_ZERO 0x0100
537 #define IDLEMODE_ZERO 0x0200
538 #define IDLEMODE_ONE 0x0300
539 #define IDLEMODE_ALT_MARK_SPACE 0x0500
540 #define IDLEMODE_SPACE 0x0600
541 #define IDLEMODE_MARK 0x0700
542 #define IDLEMODE_MASK 0x0700
545 * IUSC revision identifiers
547 #define IUSC_SL1660 0x4d44
548 #define IUSC_PRE_SL1660 0x4553
551 * Transmit status Bits in Transmit Command/status Register (TCSR)
554 #define TCSR_PRESERVE 0x0F00
556 #define TCSR_UNDERWAIT BIT11
557 #define TXSTATUS_PREAMBLE_SENT BIT7
558 #define TXSTATUS_IDLE_SENT BIT6
559 #define TXSTATUS_ABORT_SENT BIT5
560 #define TXSTATUS_EOF_SENT BIT4
561 #define TXSTATUS_EOM_SENT BIT4
562 #define TXSTATUS_CRC_SENT BIT3
563 #define TXSTATUS_ALL_SENT BIT2
564 #define TXSTATUS_UNDERRUN BIT1
565 #define TXSTATUS_FIFO_EMPTY BIT0
566 #define TXSTATUS_ALL 0x00fa
567 #define usc_UnlatchTxstatusBits(a,b) usc_OutReg( (a), TCSR, (u16)((a)->tcsr_value + ((b) & 0x00FF)) )
570 #define MISCSTATUS_RXC_LATCHED BIT15
571 #define MISCSTATUS_RXC BIT14
572 #define MISCSTATUS_TXC_LATCHED BIT13
573 #define MISCSTATUS_TXC BIT12
574 #define MISCSTATUS_RI_LATCHED BIT11
575 #define MISCSTATUS_RI BIT10
576 #define MISCSTATUS_DSR_LATCHED BIT9
577 #define MISCSTATUS_DSR BIT8
578 #define MISCSTATUS_DCD_LATCHED BIT7
579 #define MISCSTATUS_DCD BIT6
580 #define MISCSTATUS_CTS_LATCHED BIT5
581 #define MISCSTATUS_CTS BIT4
582 #define MISCSTATUS_RCC_UNDERRUN BIT3
583 #define MISCSTATUS_DPLL_NO_SYNC BIT2
584 #define MISCSTATUS_BRG1_ZERO BIT1
585 #define MISCSTATUS_BRG0_ZERO BIT0
587 #define usc_UnlatchIostatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0xaaa0))
588 #define usc_UnlatchMiscstatusBits(a,b) usc_OutReg((a),MISR,(u16)((b) & 0x000f))
590 #define SICR_RXC_ACTIVE BIT15
591 #define SICR_RXC_INACTIVE BIT14
592 #define SICR_RXC (BIT15+BIT14)
593 #define SICR_TXC_ACTIVE BIT13
594 #define SICR_TXC_INACTIVE BIT12
595 #define SICR_TXC (BIT13+BIT12)
596 #define SICR_RI_ACTIVE BIT11
597 #define SICR_RI_INACTIVE BIT10
598 #define SICR_RI (BIT11+BIT10)
599 #define SICR_DSR_ACTIVE BIT9
600 #define SICR_DSR_INACTIVE BIT8
601 #define SICR_DSR (BIT9+BIT8)
602 #define SICR_DCD_ACTIVE BIT7
603 #define SICR_DCD_INACTIVE BIT6
604 #define SICR_DCD (BIT7+BIT6)
605 #define SICR_CTS_ACTIVE BIT5
606 #define SICR_CTS_INACTIVE BIT4
607 #define SICR_CTS (BIT5+BIT4)
608 #define SICR_RCC_UNDERFLOW BIT3
609 #define SICR_DPLL_NO_SYNC BIT2
610 #define SICR_BRG1_ZERO BIT1
611 #define SICR_BRG0_ZERO BIT0
613 void usc_DisableMasterIrqBit( struct mgsl_struct *info );
614 void usc_EnableMasterIrqBit( struct mgsl_struct *info );
615 void usc_EnableInterrupts( struct mgsl_struct *info, u16 IrqMask );
616 void usc_DisableInterrupts( struct mgsl_struct *info, u16 IrqMask );
617 void usc_ClearIrqPendingBits( struct mgsl_struct *info, u16 IrqMask );
619 #define usc_EnableInterrupts( a, b ) \
620 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0xc0 + (b)) )
622 #define usc_DisableInterrupts( a, b ) \
623 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0xff00) + 0x80 + (b)) )
625 #define usc_EnableMasterIrqBit(a) \
626 usc_OutReg( (a), ICR, (u16)((usc_InReg((a),ICR) & 0x0f00) + 0xb000) )
628 #define usc_DisableMasterIrqBit(a) \
629 usc_OutReg( (a), ICR, (u16)(usc_InReg((a),ICR) & 0x7f00) )
631 #define usc_ClearIrqPendingBits( a, b ) usc_OutReg( (a), DCCR, 0x40 + (b) )
634 * Transmit status Bits in Transmit Control status Register (TCSR)
635 * and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0)
638 #define TXSTATUS_PREAMBLE_SENT BIT7
639 #define TXSTATUS_IDLE_SENT BIT6
640 #define TXSTATUS_ABORT_SENT BIT5
641 #define TXSTATUS_EOF BIT4
642 #define TXSTATUS_CRC_SENT BIT3
643 #define TXSTATUS_ALL_SENT BIT2
644 #define TXSTATUS_UNDERRUN BIT1
645 #define TXSTATUS_FIFO_EMPTY BIT0
647 #define DICR_MASTER BIT15
648 #define DICR_TRANSMIT BIT0
649 #define DICR_RECEIVE BIT1
651 #define usc_EnableDmaInterrupts(a,b) \
652 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) | (b)) )
654 #define usc_DisableDmaInterrupts(a,b) \
655 usc_OutDmaReg( (a), DICR, (u16)(usc_InDmaReg((a),DICR) & ~(b)) )
657 #define usc_EnableStatusIrqs(a,b) \
658 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) | (b)) )
660 #define usc_DisablestatusIrqs(a,b) \
661 usc_OutReg( (a), SICR, (u16)(usc_InReg((a),SICR) & ~(b)) )
663 /* Transmit status Bits in Transmit Control status Register (TCSR) */
664 /* and Transmit Interrupt Control Register (TICR) (except BIT2, BIT0) */
667 #define DISABLE_UNCONDITIONAL 0
668 #define DISABLE_END_OF_FRAME 1
669 #define ENABLE_UNCONDITIONAL 2
670 #define ENABLE_AUTO_CTS 3
671 #define ENABLE_AUTO_DCD 3
672 #define usc_EnableTransmitter(a,b) \
673 usc_OutReg( (a), TMR, (u16)((usc_InReg((a),TMR) & 0xfffc) | (b)) )
674 #define usc_EnableReceiver(a,b) \
675 usc_OutReg( (a), RMR, (u16)((usc_InReg((a),RMR) & 0xfffc) | (b)) )
677 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 Port );
678 static void usc_OutDmaReg( struct mgsl_struct *info, u16 Port, u16 Value );
679 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd );
681 static u16 usc_InReg( struct mgsl_struct *info, u16 Port );
682 static void usc_OutReg( struct mgsl_struct *info, u16 Port, u16 Value );
683 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd );
684 void usc_RCmd( struct mgsl_struct *info, u16 Cmd );
685 void usc_TCmd( struct mgsl_struct *info, u16 Cmd );
687 #define usc_TCmd(a,b) usc_OutReg((a), TCSR, (u16)((a)->tcsr_value + (b)))
688 #define usc_RCmd(a,b) usc_OutReg((a), RCSR, (b))
690 #define usc_SetTransmitSyncChars(a,s0,s1) usc_OutReg((a), TSR, (u16)(((u16)s0<<8)|(u16)s1))
692 static void usc_process_rxoverrun_sync( struct mgsl_struct *info );
693 static void usc_start_receiver( struct mgsl_struct *info );
694 static void usc_stop_receiver( struct mgsl_struct *info );
696 static void usc_start_transmitter( struct mgsl_struct *info );
697 static void usc_stop_transmitter( struct mgsl_struct *info );
698 static void usc_set_txidle( struct mgsl_struct *info );
699 static void usc_load_txfifo( struct mgsl_struct *info );
701 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 DataRate );
702 static void usc_enable_loopback( struct mgsl_struct *info, int enable );
704 static void usc_get_serial_signals( struct mgsl_struct *info );
705 static void usc_set_serial_signals( struct mgsl_struct *info );
707 static void usc_reset( struct mgsl_struct *info );
709 static void usc_set_sync_mode( struct mgsl_struct *info );
710 static void usc_set_sdlc_mode( struct mgsl_struct *info );
711 static void usc_set_async_mode( struct mgsl_struct *info );
712 static void usc_enable_async_clock( struct mgsl_struct *info, u32 DataRate );
714 static void usc_loopback_frame( struct mgsl_struct *info );
716 static void mgsl_tx_timeout(unsigned long context);
719 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info );
720 static void usc_loopmode_insert_request( struct mgsl_struct * info );
721 static int usc_loopmode_active( struct mgsl_struct * info);
722 static void usc_loopmode_send_done( struct mgsl_struct * info );
724 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg);
726 #if SYNCLINK_GENERIC_HDLC
727 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
728 static void hdlcdev_tx_done(struct mgsl_struct *info);
729 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size);
730 static int hdlcdev_init(struct mgsl_struct *info);
731 static void hdlcdev_exit(struct mgsl_struct *info);
735 * Defines a BUS descriptor value for the PCI adapter
736 * local bus address ranges.
739 #define BUS_DESCRIPTOR( WrHold, WrDly, RdDly, Nwdd, Nwad, Nxda, Nrdd, Nrad ) \
750 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit);
753 * Adapter diagnostic routines
755 static bool mgsl_register_test( struct mgsl_struct *info );
756 static bool mgsl_irq_test( struct mgsl_struct *info );
757 static bool mgsl_dma_test( struct mgsl_struct *info );
758 static bool mgsl_memory_test( struct mgsl_struct *info );
759 static int mgsl_adapter_test( struct mgsl_struct *info );
762 * device and resource management routines
764 static int mgsl_claim_resources(struct mgsl_struct *info);
765 static void mgsl_release_resources(struct mgsl_struct *info);
766 static void mgsl_add_device(struct mgsl_struct *info);
767 static struct mgsl_struct* mgsl_allocate_device(void);
770 * DMA buffer manupulation functions.
772 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex );
773 static bool mgsl_get_rx_frame( struct mgsl_struct *info );
774 static bool mgsl_get_raw_rx_frame( struct mgsl_struct *info );
775 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info );
776 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info );
777 static int num_free_tx_dma_buffers(struct mgsl_struct *info);
778 static void mgsl_load_tx_dma_buffer( struct mgsl_struct *info, const char *Buffer, unsigned int BufferSize);
779 static void mgsl_load_pci_memory(char* TargetPtr, const char* SourcePtr, unsigned short count);
782 * DMA and Shared Memory buffer allocation and formatting
784 static int mgsl_allocate_dma_buffers(struct mgsl_struct *info);
785 static void mgsl_free_dma_buffers(struct mgsl_struct *info);
786 static int mgsl_alloc_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
787 static void mgsl_free_frame_memory(struct mgsl_struct *info, DMABUFFERENTRY *BufferList,int Buffercount);
788 static int mgsl_alloc_buffer_list_memory(struct mgsl_struct *info);
789 static void mgsl_free_buffer_list_memory(struct mgsl_struct *info);
790 static int mgsl_alloc_intermediate_rxbuffer_memory(struct mgsl_struct *info);
791 static void mgsl_free_intermediate_rxbuffer_memory(struct mgsl_struct *info);
792 static int mgsl_alloc_intermediate_txbuffer_memory(struct mgsl_struct *info);
793 static void mgsl_free_intermediate_txbuffer_memory(struct mgsl_struct *info);
794 static bool load_next_tx_holding_buffer(struct mgsl_struct *info);
795 static int save_tx_buffer_request(struct mgsl_struct *info,const char *Buffer, unsigned int BufferSize);
798 * Bottom half interrupt handlers
800 static void mgsl_bh_handler(struct work_struct *work);
801 static void mgsl_bh_receive(struct mgsl_struct *info);
802 static void mgsl_bh_transmit(struct mgsl_struct *info);
803 static void mgsl_bh_status(struct mgsl_struct *info);
806 * Interrupt handler routines and dispatch table.
808 static void mgsl_isr_null( struct mgsl_struct *info );
809 static void mgsl_isr_transmit_data( struct mgsl_struct *info );
810 static void mgsl_isr_receive_data( struct mgsl_struct *info );
811 static void mgsl_isr_receive_status( struct mgsl_struct *info );
812 static void mgsl_isr_transmit_status( struct mgsl_struct *info );
813 static void mgsl_isr_io_pin( struct mgsl_struct *info );
814 static void mgsl_isr_misc( struct mgsl_struct *info );
815 static void mgsl_isr_receive_dma( struct mgsl_struct *info );
816 static void mgsl_isr_transmit_dma( struct mgsl_struct *info );
818 typedef void (*isr_dispatch_func)(struct mgsl_struct *);
820 static isr_dispatch_func UscIsrTable[7] =
825 mgsl_isr_transmit_data,
826 mgsl_isr_transmit_status,
827 mgsl_isr_receive_data,
828 mgsl_isr_receive_status
832 * ioctl call handlers
834 static int tiocmget(struct tty_struct *tty, struct file *file);
835 static int tiocmset(struct tty_struct *tty, struct file *file,
836 unsigned int set, unsigned int clear);
837 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount
838 __user *user_icount);
839 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params);
840 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params);
841 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode);
842 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode);
843 static int mgsl_txenable(struct mgsl_struct * info, int enable);
844 static int mgsl_txabort(struct mgsl_struct * info);
845 static int mgsl_rxenable(struct mgsl_struct * info, int enable);
846 static int mgsl_wait_event(struct mgsl_struct * info, int __user *mask);
847 static int mgsl_loopmode_send_done( struct mgsl_struct * info );
849 /* set non-zero on successful registration with PCI subsystem */
850 static bool pci_registered;
853 * Global linked list of SyncLink devices
855 static struct mgsl_struct *mgsl_device_list;
856 static int mgsl_device_count;
859 * Set this param to non-zero to load eax with the
860 * .text section address and breakpoint on module load.
861 * This is useful for use with gdb and add-symbol-file command.
863 static int break_on_load;
866 * Driver major number, defaults to zero to get auto
867 * assigned major number. May be forced as module parameter.
872 * Array of user specified options for ISA adapters.
874 static int io[MAX_ISA_DEVICES];
875 static int irq[MAX_ISA_DEVICES];
876 static int dma[MAX_ISA_DEVICES];
877 static int debug_level;
878 static int maxframe[MAX_TOTAL_DEVICES];
879 static int dosyncppp[MAX_TOTAL_DEVICES];
880 static int txdmabufs[MAX_TOTAL_DEVICES];
881 static int txholdbufs[MAX_TOTAL_DEVICES];
883 module_param(break_on_load, bool, 0);
884 module_param(ttymajor, int, 0);
885 module_param_array(io, int, NULL, 0);
886 module_param_array(irq, int, NULL, 0);
887 module_param_array(dma, int, NULL, 0);
888 module_param(debug_level, int, 0);
889 module_param_array(maxframe, int, NULL, 0);
890 module_param_array(dosyncppp, int, NULL, 0);
891 module_param_array(txdmabufs, int, NULL, 0);
892 module_param_array(txholdbufs, int, NULL, 0);
894 static char *driver_name = "SyncLink serial driver";
895 static char *driver_version = "$Revision: 4.38 $";
897 static int synclink_init_one (struct pci_dev *dev,
898 const struct pci_device_id *ent);
899 static void synclink_remove_one (struct pci_dev *dev);
901 static struct pci_device_id synclink_pci_tbl[] = {
902 { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_USC, PCI_ANY_ID, PCI_ANY_ID, },
903 { PCI_VENDOR_ID_MICROGATE, 0x0210, PCI_ANY_ID, PCI_ANY_ID, },
904 { 0, }, /* terminate list */
906 MODULE_DEVICE_TABLE(pci, synclink_pci_tbl);
908 MODULE_LICENSE("GPL");
910 static struct pci_driver synclink_pci_driver = {
912 .id_table = synclink_pci_tbl,
913 .probe = synclink_init_one,
914 .remove = __devexit_p(synclink_remove_one),
917 static struct tty_driver *serial_driver;
919 /* number of characters left in xmit buffer before we ask for more */
920 #define WAKEUP_CHARS 256
923 static void mgsl_change_params(struct mgsl_struct *info);
924 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout);
927 * 1st function defined in .text section. Calling this function in
928 * init_module() followed by a breakpoint allows a remote debugger
929 * (gdb) to get the .text address for the add-symbol-file command.
930 * This allows remote debugging of dynamically loadable modules.
932 static void* mgsl_get_text_ptr(void)
934 return mgsl_get_text_ptr;
937 static inline int mgsl_paranoia_check(struct mgsl_struct *info,
938 char *name, const char *routine)
940 #ifdef MGSL_PARANOIA_CHECK
941 static const char *badmagic =
942 "Warning: bad magic number for mgsl struct (%s) in %s\n";
943 static const char *badinfo =
944 "Warning: null mgsl_struct for (%s) in %s\n";
947 printk(badinfo, name, routine);
950 if (info->magic != MGSL_MAGIC) {
951 printk(badmagic, name, routine);
962 * line discipline callback wrappers
964 * The wrappers maintain line discipline references
965 * while calling into the line discipline.
967 * ldisc_receive_buf - pass receive data to line discipline
970 static void ldisc_receive_buf(struct tty_struct *tty,
971 const __u8 *data, char *flags, int count)
973 struct tty_ldisc *ld;
976 ld = tty_ldisc_ref(tty);
979 ld->receive_buf(tty, data, flags, count);
984 /* mgsl_stop() throttle (stop) transmitter
986 * Arguments: tty pointer to tty info structure
989 static void mgsl_stop(struct tty_struct *tty)
991 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
994 if (mgsl_paranoia_check(info, tty->name, "mgsl_stop"))
997 if ( debug_level >= DEBUG_LEVEL_INFO )
998 printk("mgsl_stop(%s)\n",info->device_name);
1000 spin_lock_irqsave(&info->irq_spinlock,flags);
1001 if (info->tx_enabled)
1002 usc_stop_transmitter(info);
1003 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1005 } /* end of mgsl_stop() */
1007 /* mgsl_start() release (start) transmitter
1009 * Arguments: tty pointer to tty info structure
1010 * Return Value: None
1012 static void mgsl_start(struct tty_struct *tty)
1014 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
1015 unsigned long flags;
1017 if (mgsl_paranoia_check(info, tty->name, "mgsl_start"))
1020 if ( debug_level >= DEBUG_LEVEL_INFO )
1021 printk("mgsl_start(%s)\n",info->device_name);
1023 spin_lock_irqsave(&info->irq_spinlock,flags);
1024 if (!info->tx_enabled)
1025 usc_start_transmitter(info);
1026 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1028 } /* end of mgsl_start() */
1031 * Bottom half work queue access functions
1034 /* mgsl_bh_action() Return next bottom half action to perform.
1035 * Return Value: BH action code or 0 if nothing to do.
1037 static int mgsl_bh_action(struct mgsl_struct *info)
1039 unsigned long flags;
1042 spin_lock_irqsave(&info->irq_spinlock,flags);
1044 if (info->pending_bh & BH_RECEIVE) {
1045 info->pending_bh &= ~BH_RECEIVE;
1047 } else if (info->pending_bh & BH_TRANSMIT) {
1048 info->pending_bh &= ~BH_TRANSMIT;
1050 } else if (info->pending_bh & BH_STATUS) {
1051 info->pending_bh &= ~BH_STATUS;
1056 /* Mark BH routine as complete */
1057 info->bh_running = false;
1058 info->bh_requested = false;
1061 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1067 * Perform bottom half processing of work items queued by ISR.
1069 static void mgsl_bh_handler(struct work_struct *work)
1071 struct mgsl_struct *info =
1072 container_of(work, struct mgsl_struct, task);
1078 if ( debug_level >= DEBUG_LEVEL_BH )
1079 printk( "%s(%d):mgsl_bh_handler(%s) entry\n",
1080 __FILE__,__LINE__,info->device_name);
1082 info->bh_running = true;
1084 while((action = mgsl_bh_action(info)) != 0) {
1086 /* Process work item */
1087 if ( debug_level >= DEBUG_LEVEL_BH )
1088 printk( "%s(%d):mgsl_bh_handler() work item action=%d\n",
1089 __FILE__,__LINE__,action);
1094 mgsl_bh_receive(info);
1097 mgsl_bh_transmit(info);
1100 mgsl_bh_status(info);
1103 /* unknown work item ID */
1104 printk("Unknown work item ID=%08X!\n", action);
1109 if ( debug_level >= DEBUG_LEVEL_BH )
1110 printk( "%s(%d):mgsl_bh_handler(%s) exit\n",
1111 __FILE__,__LINE__,info->device_name);
1114 static void mgsl_bh_receive(struct mgsl_struct *info)
1116 bool (*get_rx_frame)(struct mgsl_struct *info) =
1117 (info->params.mode == MGSL_MODE_HDLC ? mgsl_get_rx_frame : mgsl_get_raw_rx_frame);
1119 if ( debug_level >= DEBUG_LEVEL_BH )
1120 printk( "%s(%d):mgsl_bh_receive(%s)\n",
1121 __FILE__,__LINE__,info->device_name);
1125 if (info->rx_rcc_underrun) {
1126 unsigned long flags;
1127 spin_lock_irqsave(&info->irq_spinlock,flags);
1128 usc_start_receiver(info);
1129 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1132 } while(get_rx_frame(info));
1135 static void mgsl_bh_transmit(struct mgsl_struct *info)
1137 struct tty_struct *tty = info->tty;
1138 unsigned long flags;
1140 if ( debug_level >= DEBUG_LEVEL_BH )
1141 printk( "%s(%d):mgsl_bh_transmit() entry on %s\n",
1142 __FILE__,__LINE__,info->device_name);
1147 /* if transmitter idle and loopmode_send_done_requested
1148 * then start echoing RxD to TxD
1150 spin_lock_irqsave(&info->irq_spinlock,flags);
1151 if ( !info->tx_active && info->loopmode_send_done_requested )
1152 usc_loopmode_send_done( info );
1153 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1156 static void mgsl_bh_status(struct mgsl_struct *info)
1158 if ( debug_level >= DEBUG_LEVEL_BH )
1159 printk( "%s(%d):mgsl_bh_status() entry on %s\n",
1160 __FILE__,__LINE__,info->device_name);
1162 info->ri_chkcount = 0;
1163 info->dsr_chkcount = 0;
1164 info->dcd_chkcount = 0;
1165 info->cts_chkcount = 0;
1168 /* mgsl_isr_receive_status()
1170 * Service a receive status interrupt. The type of status
1171 * interrupt is indicated by the state of the RCSR.
1172 * This is only used for HDLC mode.
1174 * Arguments: info pointer to device instance data
1175 * Return Value: None
1177 static void mgsl_isr_receive_status( struct mgsl_struct *info )
1179 u16 status = usc_InReg( info, RCSR );
1181 if ( debug_level >= DEBUG_LEVEL_ISR )
1182 printk("%s(%d):mgsl_isr_receive_status status=%04X\n",
1183 __FILE__,__LINE__,status);
1185 if ( (status & RXSTATUS_ABORT_RECEIVED) &&
1186 info->loopmode_insert_requested &&
1187 usc_loopmode_active(info) )
1189 ++info->icount.rxabort;
1190 info->loopmode_insert_requested = false;
1192 /* clear CMR:13 to start echoing RxD to TxD */
1193 info->cmr_value &= ~BIT13;
1194 usc_OutReg(info, CMR, info->cmr_value);
1196 /* disable received abort irq (no longer required) */
1197 usc_OutReg(info, RICR,
1198 (usc_InReg(info, RICR) & ~RXSTATUS_ABORT_RECEIVED));
1201 if (status & (RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED)) {
1202 if (status & RXSTATUS_EXITED_HUNT)
1203 info->icount.exithunt++;
1204 if (status & RXSTATUS_IDLE_RECEIVED)
1205 info->icount.rxidle++;
1206 wake_up_interruptible(&info->event_wait_q);
1209 if (status & RXSTATUS_OVERRUN){
1210 info->icount.rxover++;
1211 usc_process_rxoverrun_sync( info );
1214 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
1215 usc_UnlatchRxstatusBits( info, status );
1217 } /* end of mgsl_isr_receive_status() */
1219 /* mgsl_isr_transmit_status()
1221 * Service a transmit status interrupt
1222 * HDLC mode :end of transmit frame
1223 * Async mode:all data is sent
1224 * transmit status is indicated by bits in the TCSR.
1226 * Arguments: info pointer to device instance data
1227 * Return Value: None
1229 static void mgsl_isr_transmit_status( struct mgsl_struct *info )
1231 u16 status = usc_InReg( info, TCSR );
1233 if ( debug_level >= DEBUG_LEVEL_ISR )
1234 printk("%s(%d):mgsl_isr_transmit_status status=%04X\n",
1235 __FILE__,__LINE__,status);
1237 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
1238 usc_UnlatchTxstatusBits( info, status );
1240 if ( status & (TXSTATUS_UNDERRUN | TXSTATUS_ABORT_SENT) )
1242 /* finished sending HDLC abort. This may leave */
1243 /* the TxFifo with data from the aborted frame */
1244 /* so purge the TxFifo. Also shutdown the DMA */
1245 /* channel in case there is data remaining in */
1246 /* the DMA buffer */
1247 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
1248 usc_RTCmd( info, RTCmd_PurgeTxFifo );
1251 if ( status & TXSTATUS_EOF_SENT )
1252 info->icount.txok++;
1253 else if ( status & TXSTATUS_UNDERRUN )
1254 info->icount.txunder++;
1255 else if ( status & TXSTATUS_ABORT_SENT )
1256 info->icount.txabort++;
1258 info->icount.txunder++;
1260 info->tx_active = false;
1261 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1262 del_timer(&info->tx_timer);
1264 if ( info->drop_rts_on_tx_done ) {
1265 usc_get_serial_signals( info );
1266 if ( info->serial_signals & SerialSignal_RTS ) {
1267 info->serial_signals &= ~SerialSignal_RTS;
1268 usc_set_serial_signals( info );
1270 info->drop_rts_on_tx_done = false;
1273 #if SYNCLINK_GENERIC_HDLC
1275 hdlcdev_tx_done(info);
1279 if (info->tty->stopped || info->tty->hw_stopped) {
1280 usc_stop_transmitter(info);
1283 info->pending_bh |= BH_TRANSMIT;
1286 } /* end of mgsl_isr_transmit_status() */
1288 /* mgsl_isr_io_pin()
1290 * Service an Input/Output pin interrupt. The type of
1291 * interrupt is indicated by bits in the MISR
1293 * Arguments: info pointer to device instance data
1294 * Return Value: None
1296 static void mgsl_isr_io_pin( struct mgsl_struct *info )
1298 struct mgsl_icount *icount;
1299 u16 status = usc_InReg( info, MISR );
1301 if ( debug_level >= DEBUG_LEVEL_ISR )
1302 printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
1303 __FILE__,__LINE__,status);
1305 usc_ClearIrqPendingBits( info, IO_PIN );
1306 usc_UnlatchIostatusBits( info, status );
1308 if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
1309 MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
1310 icount = &info->icount;
1311 /* update input line counters */
1312 if (status & MISCSTATUS_RI_LATCHED) {
1313 if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1314 usc_DisablestatusIrqs(info,SICR_RI);
1316 if ( status & MISCSTATUS_RI )
1317 info->input_signal_events.ri_up++;
1319 info->input_signal_events.ri_down++;
1321 if (status & MISCSTATUS_DSR_LATCHED) {
1322 if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1323 usc_DisablestatusIrqs(info,SICR_DSR);
1325 if ( status & MISCSTATUS_DSR )
1326 info->input_signal_events.dsr_up++;
1328 info->input_signal_events.dsr_down++;
1330 if (status & MISCSTATUS_DCD_LATCHED) {
1331 if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1332 usc_DisablestatusIrqs(info,SICR_DCD);
1334 if (status & MISCSTATUS_DCD) {
1335 info->input_signal_events.dcd_up++;
1337 info->input_signal_events.dcd_down++;
1338 #if SYNCLINK_GENERIC_HDLC
1339 if (info->netcount) {
1340 if (status & MISCSTATUS_DCD)
1341 netif_carrier_on(info->netdev);
1343 netif_carrier_off(info->netdev);
1347 if (status & MISCSTATUS_CTS_LATCHED)
1349 if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
1350 usc_DisablestatusIrqs(info,SICR_CTS);
1352 if ( status & MISCSTATUS_CTS )
1353 info->input_signal_events.cts_up++;
1355 info->input_signal_events.cts_down++;
1357 wake_up_interruptible(&info->status_event_wait_q);
1358 wake_up_interruptible(&info->event_wait_q);
1360 if ( (info->flags & ASYNC_CHECK_CD) &&
1361 (status & MISCSTATUS_DCD_LATCHED) ) {
1362 if ( debug_level >= DEBUG_LEVEL_ISR )
1363 printk("%s CD now %s...", info->device_name,
1364 (status & MISCSTATUS_DCD) ? "on" : "off");
1365 if (status & MISCSTATUS_DCD)
1366 wake_up_interruptible(&info->open_wait);
1368 if ( debug_level >= DEBUG_LEVEL_ISR )
1369 printk("doing serial hangup...");
1371 tty_hangup(info->tty);
1375 if ( (info->flags & ASYNC_CTS_FLOW) &&
1376 (status & MISCSTATUS_CTS_LATCHED) ) {
1377 if (info->tty->hw_stopped) {
1378 if (status & MISCSTATUS_CTS) {
1379 if ( debug_level >= DEBUG_LEVEL_ISR )
1380 printk("CTS tx start...");
1382 info->tty->hw_stopped = 0;
1383 usc_start_transmitter(info);
1384 info->pending_bh |= BH_TRANSMIT;
1388 if (!(status & MISCSTATUS_CTS)) {
1389 if ( debug_level >= DEBUG_LEVEL_ISR )
1390 printk("CTS tx stop...");
1392 info->tty->hw_stopped = 1;
1393 usc_stop_transmitter(info);
1399 info->pending_bh |= BH_STATUS;
1401 /* for diagnostics set IRQ flag */
1402 if ( status & MISCSTATUS_TXC_LATCHED ){
1403 usc_OutReg( info, SICR,
1404 (unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
1405 usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
1406 info->irq_occurred = true;
1409 } /* end of mgsl_isr_io_pin() */
1411 /* mgsl_isr_transmit_data()
1413 * Service a transmit data interrupt (async mode only).
1415 * Arguments: info pointer to device instance data
1416 * Return Value: None
1418 static void mgsl_isr_transmit_data( struct mgsl_struct *info )
1420 if ( debug_level >= DEBUG_LEVEL_ISR )
1421 printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
1422 __FILE__,__LINE__,info->xmit_cnt);
1424 usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
1426 if (info->tty->stopped || info->tty->hw_stopped) {
1427 usc_stop_transmitter(info);
1431 if ( info->xmit_cnt )
1432 usc_load_txfifo( info );
1434 info->tx_active = false;
1436 if (info->xmit_cnt < WAKEUP_CHARS)
1437 info->pending_bh |= BH_TRANSMIT;
1439 } /* end of mgsl_isr_transmit_data() */
1441 /* mgsl_isr_receive_data()
1443 * Service a receive data interrupt. This occurs
1444 * when operating in asynchronous interrupt transfer mode.
1445 * The receive data FIFO is flushed to the receive data buffers.
1447 * Arguments: info pointer to device instance data
1448 * Return Value: None
1450 static void mgsl_isr_receive_data( struct mgsl_struct *info )
1455 unsigned char DataByte;
1456 struct tty_struct *tty = info->tty;
1457 struct mgsl_icount *icount = &info->icount;
1459 if ( debug_level >= DEBUG_LEVEL_ISR )
1460 printk("%s(%d):mgsl_isr_receive_data\n",
1463 usc_ClearIrqPendingBits( info, RECEIVE_DATA );
1465 /* select FIFO status for RICR readback */
1466 usc_RCmd( info, RCmd_SelectRicrRxFifostatus );
1468 /* clear the Wordstatus bit so that status readback */
1469 /* only reflects the status of this byte */
1470 usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));
1472 /* flush the receive FIFO */
1474 while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
1477 /* read one byte from RxFIFO */
1478 outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
1479 info->io_base + CCAR );
1480 DataByte = inb( info->io_base + CCAR );
1482 /* get the status of the received byte */
1483 status = usc_InReg(info, RCSR);
1484 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1485 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
1486 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
1491 if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
1492 RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
1493 printk("rxerr=%04X\n",status);
1494 /* update error statistics */
1495 if ( status & RXSTATUS_BREAK_RECEIVED ) {
1496 status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
1498 } else if (status & RXSTATUS_PARITY_ERROR)
1500 else if (status & RXSTATUS_FRAMING_ERROR)
1502 else if (status & RXSTATUS_OVERRUN) {
1503 /* must issue purge fifo cmd before */
1504 /* 16C32 accepts more receive chars */
1505 usc_RTCmd(info,RTCmd_PurgeRxFifo);
1509 /* discard char if tty control flags say so */
1510 if (status & info->ignore_status_mask)
1513 status &= info->read_status_mask;
1515 if (status & RXSTATUS_BREAK_RECEIVED) {
1517 if (info->flags & ASYNC_SAK)
1519 } else if (status & RXSTATUS_PARITY_ERROR)
1521 else if (status & RXSTATUS_FRAMING_ERROR)
1523 } /* end of if (error) */
1524 tty_insert_flip_char(tty, DataByte, flag);
1525 if (status & RXSTATUS_OVERRUN) {
1526 /* Overrun is special, since it's
1527 * reported immediately, and doesn't
1528 * affect the current character
1530 work += tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1534 if ( debug_level >= DEBUG_LEVEL_ISR ) {
1535 printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
1536 __FILE__,__LINE__,icount->rx,icount->brk,
1537 icount->parity,icount->frame,icount->overrun);
1541 tty_flip_buffer_push(tty);
1546 * Service a miscellaneous interrupt source.
1548 * Arguments: info pointer to device extension (instance data)
1549 * Return Value: None
1551 static void mgsl_isr_misc( struct mgsl_struct *info )
1553 u16 status = usc_InReg( info, MISR );
1555 if ( debug_level >= DEBUG_LEVEL_ISR )
1556 printk("%s(%d):mgsl_isr_misc status=%04X\n",
1557 __FILE__,__LINE__,status);
1559 if ((status & MISCSTATUS_RCC_UNDERRUN) &&
1560 (info->params.mode == MGSL_MODE_HDLC)) {
1562 /* turn off receiver and rx DMA */
1563 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
1564 usc_DmaCmd(info, DmaCmd_ResetRxChannel);
1565 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
1566 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
1567 usc_DisableInterrupts(info, RECEIVE_DATA + RECEIVE_STATUS);
1569 /* schedule BH handler to restart receiver */
1570 info->pending_bh |= BH_RECEIVE;
1571 info->rx_rcc_underrun = true;
1574 usc_ClearIrqPendingBits( info, MISC );
1575 usc_UnlatchMiscstatusBits( info, status );
1577 } /* end of mgsl_isr_misc() */
1581 * Services undefined interrupt vectors from the
1582 * USC. (hence this function SHOULD never be called)
1584 * Arguments: info pointer to device extension (instance data)
1585 * Return Value: None
1587 static void mgsl_isr_null( struct mgsl_struct *info )
1590 } /* end of mgsl_isr_null() */
1592 /* mgsl_isr_receive_dma()
1594 * Service a receive DMA channel interrupt.
1595 * For this driver there are two sources of receive DMA interrupts
1596 * as identified in the Receive DMA mode Register (RDMR):
1598 * BIT3 EOA/EOL End of List, all receive buffers in receive
1599 * buffer list have been filled (no more free buffers
1600 * available). The DMA controller has shut down.
1602 * BIT2 EOB End of Buffer. This interrupt occurs when a receive
1603 * DMA buffer is terminated in response to completion
1604 * of a good frame or a frame with errors. The status
1605 * of the frame is stored in the buffer entry in the
1606 * list of receive buffer entries.
1608 * Arguments: info pointer to device instance data
1609 * Return Value: None
1611 static void mgsl_isr_receive_dma( struct mgsl_struct *info )
1615 /* clear interrupt pending and IUS bit for Rx DMA IRQ */
1616 usc_OutDmaReg( info, CDIR, BIT9+BIT1 );
1618 /* Read the receive DMA status to identify interrupt type. */
1619 /* This also clears the status bits. */
1620 status = usc_InDmaReg( info, RDMR );
1622 if ( debug_level >= DEBUG_LEVEL_ISR )
1623 printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
1624 __FILE__,__LINE__,info->device_name,status);
1626 info->pending_bh |= BH_RECEIVE;
1628 if ( status & BIT3 ) {
1629 info->rx_overflow = true;
1630 info->icount.buf_overrun++;
1633 } /* end of mgsl_isr_receive_dma() */
1635 /* mgsl_isr_transmit_dma()
1637 * This function services a transmit DMA channel interrupt.
1639 * For this driver there is one source of transmit DMA interrupts
1640 * as identified in the Transmit DMA Mode Register (TDMR):
1642 * BIT2 EOB End of Buffer. This interrupt occurs when a
1643 * transmit DMA buffer has been emptied.
1645 * The driver maintains enough transmit DMA buffers to hold at least
1646 * one max frame size transmit frame. When operating in a buffered
1647 * transmit mode, there may be enough transmit DMA buffers to hold at
1648 * least two or more max frame size frames. On an EOB condition,
1649 * determine if there are any queued transmit buffers and copy into
1650 * transmit DMA buffers if we have room.
1652 * Arguments: info pointer to device instance data
1653 * Return Value: None
1655 static void mgsl_isr_transmit_dma( struct mgsl_struct *info )
1659 /* clear interrupt pending and IUS bit for Tx DMA IRQ */
1660 usc_OutDmaReg(info, CDIR, BIT8+BIT0 );
1662 /* Read the transmit DMA status to identify interrupt type. */
1663 /* This also clears the status bits. */
1665 status = usc_InDmaReg( info, TDMR );
1667 if ( debug_level >= DEBUG_LEVEL_ISR )
1668 printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
1669 __FILE__,__LINE__,info->device_name,status);
1671 if ( status & BIT2 ) {
1672 --info->tx_dma_buffers_used;
1674 /* if there are transmit frames queued,
1675 * try to load the next one
1677 if ( load_next_tx_holding_buffer(info) ) {
1678 /* if call returns non-zero value, we have
1679 * at least one free tx holding buffer
1681 info->pending_bh |= BH_TRANSMIT;
1685 } /* end of mgsl_isr_transmit_dma() */
1689 * Interrupt service routine entry point.
1693 * irq interrupt number that caused interrupt
1694 * dev_id device ID supplied during interrupt registration
1696 * Return Value: None
1698 static irqreturn_t mgsl_interrupt(int dummy, void *dev_id)
1700 struct mgsl_struct *info = dev_id;
1704 if ( debug_level >= DEBUG_LEVEL_ISR )
1705 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)entry.\n",
1706 __FILE__, __LINE__, info->irq_level);
1708 spin_lock(&info->irq_spinlock);
1711 /* Read the interrupt vectors from hardware. */
1712 UscVector = usc_InReg(info, IVR) >> 9;
1713 DmaVector = usc_InDmaReg(info, DIVR);
1715 if ( debug_level >= DEBUG_LEVEL_ISR )
1716 printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
1717 __FILE__,__LINE__,info->device_name,UscVector,DmaVector);
1719 if ( !UscVector && !DmaVector )
1722 /* Dispatch interrupt vector */
1724 (*UscIsrTable[UscVector])(info);
1725 else if ( (DmaVector&(BIT10|BIT9)) == BIT10)
1726 mgsl_isr_transmit_dma(info);
1728 mgsl_isr_receive_dma(info);
1730 if ( info->isr_overflow ) {
1731 printk(KERN_ERR "%s(%d):%s isr overflow irq=%d\n",
1732 __FILE__, __LINE__, info->device_name, info->irq_level);
1733 usc_DisableMasterIrqBit(info);
1734 usc_DisableDmaInterrupts(info,DICR_MASTER);
1739 /* Request bottom half processing if there's something
1740 * for it to do and the bh is not already running
1743 if ( info->pending_bh && !info->bh_running && !info->bh_requested ) {
1744 if ( debug_level >= DEBUG_LEVEL_ISR )
1745 printk("%s(%d):%s queueing bh task.\n",
1746 __FILE__,__LINE__,info->device_name);
1747 schedule_work(&info->task);
1748 info->bh_requested = true;
1751 spin_unlock(&info->irq_spinlock);
1753 if ( debug_level >= DEBUG_LEVEL_ISR )
1754 printk(KERN_DEBUG "%s(%d):mgsl_interrupt(%d)exit.\n",
1755 __FILE__, __LINE__, info->irq_level);
1758 } /* end of mgsl_interrupt() */
1762 * Initialize and start device.
1764 * Arguments: info pointer to device instance data
1765 * Return Value: 0 if success, otherwise error code
1767 static int startup(struct mgsl_struct * info)
1771 if ( debug_level >= DEBUG_LEVEL_INFO )
1772 printk("%s(%d):mgsl_startup(%s)\n",__FILE__,__LINE__,info->device_name);
1774 if (info->flags & ASYNC_INITIALIZED)
1777 if (!info->xmit_buf) {
1778 /* allocate a page of memory for a transmit buffer */
1779 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
1780 if (!info->xmit_buf) {
1781 printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
1782 __FILE__,__LINE__,info->device_name);
1787 info->pending_bh = 0;
1789 memset(&info->icount, 0, sizeof(info->icount));
1791 setup_timer(&info->tx_timer, mgsl_tx_timeout, (unsigned long)info);
1793 /* Allocate and claim adapter resources */
1794 retval = mgsl_claim_resources(info);
1796 /* perform existence check and diagnostics */
1798 retval = mgsl_adapter_test(info);
1801 if (capable(CAP_SYS_ADMIN) && info->tty)
1802 set_bit(TTY_IO_ERROR, &info->tty->flags);
1803 mgsl_release_resources(info);
1807 /* program hardware for current parameters */
1808 mgsl_change_params(info);
1811 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1813 info->flags |= ASYNC_INITIALIZED;
1817 } /* end of startup() */
1821 * Called by mgsl_close() and mgsl_hangup() to shutdown hardware
1823 * Arguments: info pointer to device instance data
1824 * Return Value: None
1826 static void shutdown(struct mgsl_struct * info)
1828 unsigned long flags;
1830 if (!(info->flags & ASYNC_INITIALIZED))
1833 if (debug_level >= DEBUG_LEVEL_INFO)
1834 printk("%s(%d):mgsl_shutdown(%s)\n",
1835 __FILE__,__LINE__, info->device_name );
1837 /* clear status wait queue because status changes */
1838 /* can't happen after shutting down the hardware */
1839 wake_up_interruptible(&info->status_event_wait_q);
1840 wake_up_interruptible(&info->event_wait_q);
1842 del_timer_sync(&info->tx_timer);
1844 if (info->xmit_buf) {
1845 free_page((unsigned long) info->xmit_buf);
1846 info->xmit_buf = NULL;
1849 spin_lock_irqsave(&info->irq_spinlock,flags);
1850 usc_DisableMasterIrqBit(info);
1851 usc_stop_receiver(info);
1852 usc_stop_transmitter(info);
1853 usc_DisableInterrupts(info,RECEIVE_DATA + RECEIVE_STATUS +
1854 TRANSMIT_DATA + TRANSMIT_STATUS + IO_PIN + MISC );
1855 usc_DisableDmaInterrupts(info,DICR_MASTER + DICR_TRANSMIT + DICR_RECEIVE);
1857 /* Disable DMAEN (Port 7, Bit 14) */
1858 /* This disconnects the DMA request signal from the ISA bus */
1859 /* on the ISA adapter. This has no effect for the PCI adapter */
1860 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) | BIT14));
1862 /* Disable INTEN (Port 6, Bit12) */
1863 /* This disconnects the IRQ request signal to the ISA bus */
1864 /* on the ISA adapter. This has no effect for the PCI adapter */
1865 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) | BIT12));
1867 if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
1868 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
1869 usc_set_serial_signals(info);
1872 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1874 mgsl_release_resources(info);
1877 set_bit(TTY_IO_ERROR, &info->tty->flags);
1879 info->flags &= ~ASYNC_INITIALIZED;
1881 } /* end of shutdown() */
1883 static void mgsl_program_hw(struct mgsl_struct *info)
1885 unsigned long flags;
1887 spin_lock_irqsave(&info->irq_spinlock,flags);
1889 usc_stop_receiver(info);
1890 usc_stop_transmitter(info);
1891 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1893 if (info->params.mode == MGSL_MODE_HDLC ||
1894 info->params.mode == MGSL_MODE_RAW ||
1896 usc_set_sync_mode(info);
1898 usc_set_async_mode(info);
1900 usc_set_serial_signals(info);
1902 info->dcd_chkcount = 0;
1903 info->cts_chkcount = 0;
1904 info->ri_chkcount = 0;
1905 info->dsr_chkcount = 0;
1907 usc_EnableStatusIrqs(info,SICR_CTS+SICR_DSR+SICR_DCD+SICR_RI);
1908 usc_EnableInterrupts(info, IO_PIN);
1909 usc_get_serial_signals(info);
1911 if (info->netcount || info->tty->termios->c_cflag & CREAD)
1912 usc_start_receiver(info);
1914 spin_unlock_irqrestore(&info->irq_spinlock,flags);
1917 /* Reconfigure adapter based on new parameters
1919 static void mgsl_change_params(struct mgsl_struct *info)
1924 if (!info->tty || !info->tty->termios)
1927 if (debug_level >= DEBUG_LEVEL_INFO)
1928 printk("%s(%d):mgsl_change_params(%s)\n",
1929 __FILE__,__LINE__, info->device_name );
1931 cflag = info->tty->termios->c_cflag;
1933 /* if B0 rate (hangup) specified then negate DTR and RTS */
1934 /* otherwise assert DTR and RTS */
1936 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1938 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
1940 /* byte size and parity */
1942 switch (cflag & CSIZE) {
1943 case CS5: info->params.data_bits = 5; break;
1944 case CS6: info->params.data_bits = 6; break;
1945 case CS7: info->params.data_bits = 7; break;
1946 case CS8: info->params.data_bits = 8; break;
1947 /* Never happens, but GCC is too dumb to figure it out */
1948 default: info->params.data_bits = 7; break;
1952 info->params.stop_bits = 2;
1954 info->params.stop_bits = 1;
1956 info->params.parity = ASYNC_PARITY_NONE;
1957 if (cflag & PARENB) {
1959 info->params.parity = ASYNC_PARITY_ODD;
1961 info->params.parity = ASYNC_PARITY_EVEN;
1964 info->params.parity = ASYNC_PARITY_SPACE;
1968 /* calculate number of jiffies to transmit a full
1969 * FIFO (32 bytes) at specified data rate
1971 bits_per_char = info->params.data_bits +
1972 info->params.stop_bits + 1;
1974 /* if port data rate is set to 460800 or less then
1975 * allow tty settings to override, otherwise keep the
1976 * current data rate.
1978 if (info->params.data_rate <= 460800)
1979 info->params.data_rate = tty_get_baud_rate(info->tty);
1981 if ( info->params.data_rate ) {
1982 info->timeout = (32*HZ*bits_per_char) /
1983 info->params.data_rate;
1985 info->timeout += HZ/50; /* Add .02 seconds of slop */
1987 if (cflag & CRTSCTS)
1988 info->flags |= ASYNC_CTS_FLOW;
1990 info->flags &= ~ASYNC_CTS_FLOW;
1993 info->flags &= ~ASYNC_CHECK_CD;
1995 info->flags |= ASYNC_CHECK_CD;
1997 /* process tty input control flags */
1999 info->read_status_mask = RXSTATUS_OVERRUN;
2000 if (I_INPCK(info->tty))
2001 info->read_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2002 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2003 info->read_status_mask |= RXSTATUS_BREAK_RECEIVED;
2005 if (I_IGNPAR(info->tty))
2006 info->ignore_status_mask |= RXSTATUS_PARITY_ERROR | RXSTATUS_FRAMING_ERROR;
2007 if (I_IGNBRK(info->tty)) {
2008 info->ignore_status_mask |= RXSTATUS_BREAK_RECEIVED;
2009 /* If ignoring parity and break indicators, ignore
2010 * overruns too. (For real raw support).
2012 if (I_IGNPAR(info->tty))
2013 info->ignore_status_mask |= RXSTATUS_OVERRUN;
2016 mgsl_program_hw(info);
2018 } /* end of mgsl_change_params() */
2022 * Add a character to the transmit buffer.
2024 * Arguments: tty pointer to tty information structure
2025 * ch character to add to transmit buffer
2027 * Return Value: None
2029 static void mgsl_put_char(struct tty_struct *tty, unsigned char ch)
2031 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2032 unsigned long flags;
2034 if ( debug_level >= DEBUG_LEVEL_INFO ) {
2035 printk( "%s(%d):mgsl_put_char(%d) on %s\n",
2036 __FILE__,__LINE__,ch,info->device_name);
2039 if (mgsl_paranoia_check(info, tty->name, "mgsl_put_char"))
2042 if (!tty || !info->xmit_buf)
2045 spin_lock_irqsave(&info->irq_spinlock,flags);
2047 if ( (info->params.mode == MGSL_MODE_ASYNC ) || !info->tx_active ) {
2049 if (info->xmit_cnt < SERIAL_XMIT_SIZE - 1) {
2050 info->xmit_buf[info->xmit_head++] = ch;
2051 info->xmit_head &= SERIAL_XMIT_SIZE-1;
2056 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2058 } /* end of mgsl_put_char() */
2060 /* mgsl_flush_chars()
2062 * Enable transmitter so remaining characters in the
2063 * transmit buffer are sent.
2065 * Arguments: tty pointer to tty information structure
2066 * Return Value: None
2068 static void mgsl_flush_chars(struct tty_struct *tty)
2070 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2071 unsigned long flags;
2073 if ( debug_level >= DEBUG_LEVEL_INFO )
2074 printk( "%s(%d):mgsl_flush_chars() entry on %s xmit_cnt=%d\n",
2075 __FILE__,__LINE__,info->device_name,info->xmit_cnt);
2077 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_chars"))
2080 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
2084 if ( debug_level >= DEBUG_LEVEL_INFO )
2085 printk( "%s(%d):mgsl_flush_chars() entry on %s starting transmitter\n",
2086 __FILE__,__LINE__,info->device_name );
2088 spin_lock_irqsave(&info->irq_spinlock,flags);
2090 if (!info->tx_active) {
2091 if ( (info->params.mode == MGSL_MODE_HDLC ||
2092 info->params.mode == MGSL_MODE_RAW) && info->xmit_cnt ) {
2093 /* operating in synchronous (frame oriented) mode */
2094 /* copy data from circular xmit_buf to */
2095 /* transmit DMA buffer. */
2096 mgsl_load_tx_dma_buffer(info,
2097 info->xmit_buf,info->xmit_cnt);
2099 usc_start_transmitter(info);
2102 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2104 } /* end of mgsl_flush_chars() */
2108 * Send a block of data
2112 * tty pointer to tty information structure
2113 * buf pointer to buffer containing send data
2114 * count size of send data in bytes
2116 * Return Value: number of characters written
2118 static int mgsl_write(struct tty_struct * tty,
2119 const unsigned char *buf, int count)
2122 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2123 unsigned long flags;
2125 if ( debug_level >= DEBUG_LEVEL_INFO )
2126 printk( "%s(%d):mgsl_write(%s) count=%d\n",
2127 __FILE__,__LINE__,info->device_name,count);
2129 if (mgsl_paranoia_check(info, tty->name, "mgsl_write"))
2132 if (!tty || !info->xmit_buf)
2135 if ( info->params.mode == MGSL_MODE_HDLC ||
2136 info->params.mode == MGSL_MODE_RAW ) {
2137 /* operating in synchronous (frame oriented) mode */
2138 /* operating in synchronous (frame oriented) mode */
2139 if (info->tx_active) {
2141 if ( info->params.mode == MGSL_MODE_HDLC ) {
2145 /* transmitter is actively sending data -
2146 * if we have multiple transmit dma and
2147 * holding buffers, attempt to queue this
2148 * frame for transmission at a later time.
2150 if (info->tx_holding_count >= info->num_tx_holding_buffers ) {
2151 /* no tx holding buffers available */
2156 /* queue transmit frame request */
2158 save_tx_buffer_request(info,buf,count);
2160 /* if we have sufficient tx dma buffers,
2161 * load the next buffered tx request
2163 spin_lock_irqsave(&info->irq_spinlock,flags);
2164 load_next_tx_holding_buffer(info);
2165 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2169 /* if operating in HDLC LoopMode and the adapter */
2170 /* has yet to be inserted into the loop, we can't */
2173 if ( (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) &&
2174 !usc_loopmode_active(info) )
2180 if ( info->xmit_cnt ) {
2181 /* Send accumulated from send_char() calls */
2182 /* as frame and wait before accepting more data. */
2185 /* copy data from circular xmit_buf to */
2186 /* transmit DMA buffer. */
2187 mgsl_load_tx_dma_buffer(info,
2188 info->xmit_buf,info->xmit_cnt);
2189 if ( debug_level >= DEBUG_LEVEL_INFO )
2190 printk( "%s(%d):mgsl_write(%s) sync xmit_cnt flushing\n",
2191 __FILE__,__LINE__,info->device_name);
2193 if ( debug_level >= DEBUG_LEVEL_INFO )
2194 printk( "%s(%d):mgsl_write(%s) sync transmit accepted\n",
2195 __FILE__,__LINE__,info->device_name);
2197 info->xmit_cnt = count;
2198 mgsl_load_tx_dma_buffer(info,buf,count);
2202 spin_lock_irqsave(&info->irq_spinlock,flags);
2203 c = min_t(int, count,
2204 min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
2205 SERIAL_XMIT_SIZE - info->xmit_head));
2207 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2210 memcpy(info->xmit_buf + info->xmit_head, buf, c);
2211 info->xmit_head = ((info->xmit_head + c) &
2212 (SERIAL_XMIT_SIZE-1));
2213 info->xmit_cnt += c;
2214 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2221 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
2222 spin_lock_irqsave(&info->irq_spinlock,flags);
2223 if (!info->tx_active)
2224 usc_start_transmitter(info);
2225 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2228 if ( debug_level >= DEBUG_LEVEL_INFO )
2229 printk( "%s(%d):mgsl_write(%s) returning=%d\n",
2230 __FILE__,__LINE__,info->device_name,ret);
2234 } /* end of mgsl_write() */
2236 /* mgsl_write_room()
2238 * Return the count of free bytes in transmit buffer
2240 * Arguments: tty pointer to tty info structure
2241 * Return Value: None
2243 static int mgsl_write_room(struct tty_struct *tty)
2245 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2248 if (mgsl_paranoia_check(info, tty->name, "mgsl_write_room"))
2250 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
2254 if (debug_level >= DEBUG_LEVEL_INFO)
2255 printk("%s(%d):mgsl_write_room(%s)=%d\n",
2256 __FILE__,__LINE__, info->device_name,ret );
2258 if ( info->params.mode == MGSL_MODE_HDLC ||
2259 info->params.mode == MGSL_MODE_RAW ) {
2260 /* operating in synchronous (frame oriented) mode */
2261 if ( info->tx_active )
2264 return HDLC_MAX_FRAME_SIZE;
2269 } /* end of mgsl_write_room() */
2271 /* mgsl_chars_in_buffer()
2273 * Return the count of bytes in transmit buffer
2275 * Arguments: tty pointer to tty info structure
2276 * Return Value: None
2278 static int mgsl_chars_in_buffer(struct tty_struct *tty)
2280 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2282 if (debug_level >= DEBUG_LEVEL_INFO)
2283 printk("%s(%d):mgsl_chars_in_buffer(%s)\n",
2284 __FILE__,__LINE__, info->device_name );
2286 if (mgsl_paranoia_check(info, tty->name, "mgsl_chars_in_buffer"))
2289 if (debug_level >= DEBUG_LEVEL_INFO)
2290 printk("%s(%d):mgsl_chars_in_buffer(%s)=%d\n",
2291 __FILE__,__LINE__, info->device_name,info->xmit_cnt );
2293 if ( info->params.mode == MGSL_MODE_HDLC ||
2294 info->params.mode == MGSL_MODE_RAW ) {
2295 /* operating in synchronous (frame oriented) mode */
2296 if ( info->tx_active )
2297 return info->max_frame_size;
2302 return info->xmit_cnt;
2303 } /* end of mgsl_chars_in_buffer() */
2305 /* mgsl_flush_buffer()
2307 * Discard all data in the send buffer
2309 * Arguments: tty pointer to tty info structure
2310 * Return Value: None
2312 static void mgsl_flush_buffer(struct tty_struct *tty)
2314 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2315 unsigned long flags;
2317 if (debug_level >= DEBUG_LEVEL_INFO)
2318 printk("%s(%d):mgsl_flush_buffer(%s) entry\n",
2319 __FILE__,__LINE__, info->device_name );
2321 if (mgsl_paranoia_check(info, tty->name, "mgsl_flush_buffer"))
2324 spin_lock_irqsave(&info->irq_spinlock,flags);
2325 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
2326 del_timer(&info->tx_timer);
2327 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2332 /* mgsl_send_xchar()
2334 * Send a high-priority XON/XOFF character
2336 * Arguments: tty pointer to tty info structure
2337 * ch character to send
2338 * Return Value: None
2340 static void mgsl_send_xchar(struct tty_struct *tty, char ch)
2342 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2343 unsigned long flags;
2345 if (debug_level >= DEBUG_LEVEL_INFO)
2346 printk("%s(%d):mgsl_send_xchar(%s,%d)\n",
2347 __FILE__,__LINE__, info->device_name, ch );
2349 if (mgsl_paranoia_check(info, tty->name, "mgsl_send_xchar"))
2354 /* Make sure transmit interrupts are on */
2355 spin_lock_irqsave(&info->irq_spinlock,flags);
2356 if (!info->tx_enabled)
2357 usc_start_transmitter(info);
2358 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2360 } /* end of mgsl_send_xchar() */
2364 * Signal remote device to throttle send data (our receive data)
2366 * Arguments: tty pointer to tty info structure
2367 * Return Value: None
2369 static void mgsl_throttle(struct tty_struct * tty)
2371 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2372 unsigned long flags;
2374 if (debug_level >= DEBUG_LEVEL_INFO)
2375 printk("%s(%d):mgsl_throttle(%s) entry\n",
2376 __FILE__,__LINE__, info->device_name );
2378 if (mgsl_paranoia_check(info, tty->name, "mgsl_throttle"))
2382 mgsl_send_xchar(tty, STOP_CHAR(tty));
2384 if (tty->termios->c_cflag & CRTSCTS) {
2385 spin_lock_irqsave(&info->irq_spinlock,flags);
2386 info->serial_signals &= ~SerialSignal_RTS;
2387 usc_set_serial_signals(info);
2388 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2390 } /* end of mgsl_throttle() */
2392 /* mgsl_unthrottle()
2394 * Signal remote device to stop throttling send data (our receive data)
2396 * Arguments: tty pointer to tty info structure
2397 * Return Value: None
2399 static void mgsl_unthrottle(struct tty_struct * tty)
2401 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2402 unsigned long flags;
2404 if (debug_level >= DEBUG_LEVEL_INFO)
2405 printk("%s(%d):mgsl_unthrottle(%s) entry\n",
2406 __FILE__,__LINE__, info->device_name );
2408 if (mgsl_paranoia_check(info, tty->name, "mgsl_unthrottle"))
2415 mgsl_send_xchar(tty, START_CHAR(tty));
2418 if (tty->termios->c_cflag & CRTSCTS) {
2419 spin_lock_irqsave(&info->irq_spinlock,flags);
2420 info->serial_signals |= SerialSignal_RTS;
2421 usc_set_serial_signals(info);
2422 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2425 } /* end of mgsl_unthrottle() */
2429 * get the current serial parameters information
2431 * Arguments: info pointer to device instance data
2432 * user_icount pointer to buffer to hold returned stats
2434 * Return Value: 0 if success, otherwise error code
2436 static int mgsl_get_stats(struct mgsl_struct * info, struct mgsl_icount __user *user_icount)
2440 if (debug_level >= DEBUG_LEVEL_INFO)
2441 printk("%s(%d):mgsl_get_params(%s)\n",
2442 __FILE__,__LINE__, info->device_name);
2445 memset(&info->icount, 0, sizeof(info->icount));
2447 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2454 } /* end of mgsl_get_stats() */
2456 /* mgsl_get_params()
2458 * get the current serial parameters information
2460 * Arguments: info pointer to device instance data
2461 * user_params pointer to buffer to hold returned params
2463 * Return Value: 0 if success, otherwise error code
2465 static int mgsl_get_params(struct mgsl_struct * info, MGSL_PARAMS __user *user_params)
2468 if (debug_level >= DEBUG_LEVEL_INFO)
2469 printk("%s(%d):mgsl_get_params(%s)\n",
2470 __FILE__,__LINE__, info->device_name);
2472 COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2474 if ( debug_level >= DEBUG_LEVEL_INFO )
2475 printk( "%s(%d):mgsl_get_params(%s) user buffer copy failed\n",
2476 __FILE__,__LINE__,info->device_name);
2482 } /* end of mgsl_get_params() */
2484 /* mgsl_set_params()
2486 * set the serial parameters
2490 * info pointer to device instance data
2491 * new_params user buffer containing new serial params
2493 * Return Value: 0 if success, otherwise error code
2495 static int mgsl_set_params(struct mgsl_struct * info, MGSL_PARAMS __user *new_params)
2497 unsigned long flags;
2498 MGSL_PARAMS tmp_params;
2501 if (debug_level >= DEBUG_LEVEL_INFO)
2502 printk("%s(%d):mgsl_set_params %s\n", __FILE__,__LINE__,
2503 info->device_name );
2504 COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2506 if ( debug_level >= DEBUG_LEVEL_INFO )
2507 printk( "%s(%d):mgsl_set_params(%s) user buffer copy failed\n",
2508 __FILE__,__LINE__,info->device_name);
2512 spin_lock_irqsave(&info->irq_spinlock,flags);
2513 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2514 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2516 mgsl_change_params(info);
2520 } /* end of mgsl_set_params() */
2522 /* mgsl_get_txidle()
2524 * get the current transmit idle mode
2526 * Arguments: info pointer to device instance data
2527 * idle_mode pointer to buffer to hold returned idle mode
2529 * Return Value: 0 if success, otherwise error code
2531 static int mgsl_get_txidle(struct mgsl_struct * info, int __user *idle_mode)
2535 if (debug_level >= DEBUG_LEVEL_INFO)
2536 printk("%s(%d):mgsl_get_txidle(%s)=%d\n",
2537 __FILE__,__LINE__, info->device_name, info->idle_mode);
2539 COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2541 if ( debug_level >= DEBUG_LEVEL_INFO )
2542 printk( "%s(%d):mgsl_get_txidle(%s) user buffer copy failed\n",
2543 __FILE__,__LINE__,info->device_name);
2549 } /* end of mgsl_get_txidle() */
2551 /* mgsl_set_txidle() service ioctl to set transmit idle mode
2553 * Arguments: info pointer to device instance data
2554 * idle_mode new idle mode
2556 * Return Value: 0 if success, otherwise error code
2558 static int mgsl_set_txidle(struct mgsl_struct * info, int idle_mode)
2560 unsigned long flags;
2562 if (debug_level >= DEBUG_LEVEL_INFO)
2563 printk("%s(%d):mgsl_set_txidle(%s,%d)\n", __FILE__,__LINE__,
2564 info->device_name, idle_mode );
2566 spin_lock_irqsave(&info->irq_spinlock,flags);
2567 info->idle_mode = idle_mode;
2568 usc_set_txidle( info );
2569 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2572 } /* end of mgsl_set_txidle() */
2576 * enable or disable the transmitter
2580 * info pointer to device instance data
2581 * enable 1 = enable, 0 = disable
2583 * Return Value: 0 if success, otherwise error code
2585 static int mgsl_txenable(struct mgsl_struct * info, int enable)
2587 unsigned long flags;
2589 if (debug_level >= DEBUG_LEVEL_INFO)
2590 printk("%s(%d):mgsl_txenable(%s,%d)\n", __FILE__,__LINE__,
2591 info->device_name, enable);
2593 spin_lock_irqsave(&info->irq_spinlock,flags);
2595 if ( !info->tx_enabled ) {
2597 usc_start_transmitter(info);
2598 /*--------------------------------------------------
2599 * if HDLC/SDLC Loop mode, attempt to insert the
2600 * station in the 'loop' by setting CMR:13. Upon
2601 * receipt of the next GoAhead (RxAbort) sequence,
2602 * the OnLoop indicator (CCSR:7) should go active
2603 * to indicate that we are on the loop
2604 *--------------------------------------------------*/
2605 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2606 usc_loopmode_insert_request( info );
2609 if ( info->tx_enabled )
2610 usc_stop_transmitter(info);
2612 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2615 } /* end of mgsl_txenable() */
2617 /* mgsl_txabort() abort send HDLC frame
2619 * Arguments: info pointer to device instance data
2620 * Return Value: 0 if success, otherwise error code
2622 static int mgsl_txabort(struct mgsl_struct * info)
2624 unsigned long flags;
2626 if (debug_level >= DEBUG_LEVEL_INFO)
2627 printk("%s(%d):mgsl_txabort(%s)\n", __FILE__,__LINE__,
2630 spin_lock_irqsave(&info->irq_spinlock,flags);
2631 if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC )
2633 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
2634 usc_loopmode_cancel_transmit( info );
2636 usc_TCmd(info,TCmd_SendAbort);
2638 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2641 } /* end of mgsl_txabort() */
2643 /* mgsl_rxenable() enable or disable the receiver
2645 * Arguments: info pointer to device instance data
2646 * enable 1 = enable, 0 = disable
2647 * Return Value: 0 if success, otherwise error code
2649 static int mgsl_rxenable(struct mgsl_struct * info, int enable)
2651 unsigned long flags;
2653 if (debug_level >= DEBUG_LEVEL_INFO)
2654 printk("%s(%d):mgsl_rxenable(%s,%d)\n", __FILE__,__LINE__,
2655 info->device_name, enable);
2657 spin_lock_irqsave(&info->irq_spinlock,flags);
2659 if ( !info->rx_enabled )
2660 usc_start_receiver(info);
2662 if ( info->rx_enabled )
2663 usc_stop_receiver(info);
2665 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2668 } /* end of mgsl_rxenable() */
2670 /* mgsl_wait_event() wait for specified event to occur
2672 * Arguments: info pointer to device instance data
2673 * mask pointer to bitmask of events to wait for
2674 * Return Value: 0 if successful and bit mask updated with
2675 * of events triggerred,
2676 * otherwise error code
2678 static int mgsl_wait_event(struct mgsl_struct * info, int __user * mask_ptr)
2680 unsigned long flags;
2683 struct mgsl_icount cprev, cnow;
2686 struct _input_signal_events oldsigs, newsigs;
2687 DECLARE_WAITQUEUE(wait, current);
2689 COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
2694 if (debug_level >= DEBUG_LEVEL_INFO)
2695 printk("%s(%d):mgsl_wait_event(%s,%d)\n", __FILE__,__LINE__,
2696 info->device_name, mask);
2698 spin_lock_irqsave(&info->irq_spinlock,flags);
2700 /* return immediately if state matches requested events */
2701 usc_get_serial_signals(info);
2702 s = info->serial_signals;
2704 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2705 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2706 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2707 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2709 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2713 /* save current irq counts */
2714 cprev = info->icount;
2715 oldsigs = info->input_signal_events;
2717 /* enable hunt and idle irqs if needed */
2718 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2719 u16 oldreg = usc_InReg(info,RICR);
2720 u16 newreg = oldreg +
2721 (mask & MgslEvent_ExitHuntMode ? RXSTATUS_EXITED_HUNT:0) +
2722 (mask & MgslEvent_IdleReceived ? RXSTATUS_IDLE_RECEIVED:0);
2723 if (oldreg != newreg)
2724 usc_OutReg(info, RICR, newreg);
2727 set_current_state(TASK_INTERRUPTIBLE);
2728 add_wait_queue(&info->event_wait_q, &wait);
2730 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2735 if (signal_pending(current)) {
2740 /* get current irq counts */
2741 spin_lock_irqsave(&info->irq_spinlock,flags);
2742 cnow = info->icount;
2743 newsigs = info->input_signal_events;
2744 set_current_state(TASK_INTERRUPTIBLE);
2745 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2747 /* if no change, wait aborted for some reason */
2748 if (newsigs.dsr_up == oldsigs.dsr_up &&
2749 newsigs.dsr_down == oldsigs.dsr_down &&
2750 newsigs.dcd_up == oldsigs.dcd_up &&
2751 newsigs.dcd_down == oldsigs.dcd_down &&
2752 newsigs.cts_up == oldsigs.cts_up &&
2753 newsigs.cts_down == oldsigs.cts_down &&
2754 newsigs.ri_up == oldsigs.ri_up &&
2755 newsigs.ri_down == oldsigs.ri_down &&
2756 cnow.exithunt == cprev.exithunt &&
2757 cnow.rxidle == cprev.rxidle) {
2763 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2764 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2765 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2766 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2767 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2768 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2769 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2770 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2771 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2772 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2780 remove_wait_queue(&info->event_wait_q, &wait);
2781 set_current_state(TASK_RUNNING);
2783 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2784 spin_lock_irqsave(&info->irq_spinlock,flags);
2785 if (!waitqueue_active(&info->event_wait_q)) {
2786 /* disable enable exit hunt mode/idle rcvd IRQs */
2787 usc_OutReg(info, RICR, usc_InReg(info,RICR) &
2788 ~(RXSTATUS_EXITED_HUNT + RXSTATUS_IDLE_RECEIVED));
2790 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2794 PUT_USER(rc, events, mask_ptr);
2798 } /* end of mgsl_wait_event() */
2800 static int modem_input_wait(struct mgsl_struct *info,int arg)
2802 unsigned long flags;
2804 struct mgsl_icount cprev, cnow;
2805 DECLARE_WAITQUEUE(wait, current);
2807 /* save current irq counts */
2808 spin_lock_irqsave(&info->irq_spinlock,flags);
2809 cprev = info->icount;
2810 add_wait_queue(&info->status_event_wait_q, &wait);
2811 set_current_state(TASK_INTERRUPTIBLE);
2812 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2816 if (signal_pending(current)) {
2821 /* get new irq counts */
2822 spin_lock_irqsave(&info->irq_spinlock,flags);
2823 cnow = info->icount;
2824 set_current_state(TASK_INTERRUPTIBLE);
2825 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2827 /* if no change, wait aborted for some reason */
2828 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2829 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
2834 /* check for change in caller specified modem input */
2835 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
2836 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
2837 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
2838 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
2845 remove_wait_queue(&info->status_event_wait_q, &wait);
2846 set_current_state(TASK_RUNNING);
2850 /* return the state of the serial control and status signals
2852 static int tiocmget(struct tty_struct *tty, struct file *file)
2854 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2855 unsigned int result;
2856 unsigned long flags;
2858 spin_lock_irqsave(&info->irq_spinlock,flags);
2859 usc_get_serial_signals(info);
2860 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2862 result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
2863 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
2864 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
2865 ((info->serial_signals & SerialSignal_RI) ? TIOCM_RNG:0) +
2866 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
2867 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
2869 if (debug_level >= DEBUG_LEVEL_INFO)
2870 printk("%s(%d):%s tiocmget() value=%08X\n",
2871 __FILE__,__LINE__, info->device_name, result );
2875 /* set modem control signals (DTR/RTS)
2877 static int tiocmset(struct tty_struct *tty, struct file *file,
2878 unsigned int set, unsigned int clear)
2880 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
2881 unsigned long flags;
2883 if (debug_level >= DEBUG_LEVEL_INFO)
2884 printk("%s(%d):%s tiocmset(%x,%x)\n",
2885 __FILE__,__LINE__,info->device_name, set, clear);
2887 if (set & TIOCM_RTS)
2888 info->serial_signals |= SerialSignal_RTS;
2889 if (set & TIOCM_DTR)
2890 info->serial_signals |= SerialSignal_DTR;
2891 if (clear & TIOCM_RTS)
2892 info->serial_signals &= ~SerialSignal_RTS;
2893 if (clear & TIOCM_DTR)
2894 info->serial_signals &= ~SerialSignal_DTR;
2896 spin_lock_irqsave(&info->irq_spinlock,flags);
2897 usc_set_serial_signals(info);
2898 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2903 /* mgsl_break() Set or clear transmit break condition
2905 * Arguments: tty pointer to tty instance data
2906 * break_state -1=set break condition, 0=clear
2907 * Return Value: None
2909 static void mgsl_break(struct tty_struct *tty, int break_state)
2911 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2912 unsigned long flags;
2914 if (debug_level >= DEBUG_LEVEL_INFO)
2915 printk("%s(%d):mgsl_break(%s,%d)\n",
2916 __FILE__,__LINE__, info->device_name, break_state);
2918 if (mgsl_paranoia_check(info, tty->name, "mgsl_break"))
2921 spin_lock_irqsave(&info->irq_spinlock,flags);
2922 if (break_state == -1)
2923 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) | BIT7));
2925 usc_OutReg(info,IOCR,(u16)(usc_InReg(info,IOCR) & ~BIT7));
2926 spin_unlock_irqrestore(&info->irq_spinlock,flags);
2928 } /* end of mgsl_break() */
2930 /* mgsl_ioctl() Service an IOCTL request
2934 * tty pointer to tty instance data
2935 * file pointer to associated file object for device
2936 * cmd IOCTL command code
2937 * arg command argument/context
2939 * Return Value: 0 if success, otherwise error code
2941 static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
2942 unsigned int cmd, unsigned long arg)
2944 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
2946 if (debug_level >= DEBUG_LEVEL_INFO)
2947 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
2948 info->device_name, cmd );
2950 if (mgsl_paranoia_check(info, tty->name, "mgsl_ioctl"))
2953 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
2954 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
2955 if (tty->flags & (1 << TTY_IO_ERROR))
2959 return mgsl_ioctl_common(info, cmd, arg);
2962 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)
2965 struct mgsl_icount cnow; /* kernel counter temps */
2966 void __user *argp = (void __user *)arg;
2967 struct serial_icounter_struct __user *p_cuser; /* user space */
2968 unsigned long flags;
2971 case MGSL_IOCGPARAMS:
2972 return mgsl_get_params(info, argp);
2973 case MGSL_IOCSPARAMS:
2974 return mgsl_set_params(info, argp);
2975 case MGSL_IOCGTXIDLE:
2976 return mgsl_get_txidle(info, argp);
2977 case MGSL_IOCSTXIDLE:
2978 return mgsl_set_txidle(info,(int)arg);
2979 case MGSL_IOCTXENABLE:
2980 return mgsl_txenable(info,(int)arg);
2981 case MGSL_IOCRXENABLE:
2982 return mgsl_rxenable(info,(int)arg);
2983 case MGSL_IOCTXABORT:
2984 return mgsl_txabort(info);
2985 case MGSL_IOCGSTATS:
2986 return mgsl_get_stats(info, argp);
2987 case MGSL_IOCWAITEVENT:
2988 return mgsl_wait_event(info, argp);
2989 case MGSL_IOCLOOPTXDONE:
2990 return mgsl_loopmode_send_done(info);
2991 /* Wait for modem input (DCD,RI,DSR,CTS) change
2992 * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
2995 return modem_input_wait(info,(int)arg);
2998 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
2999 * Return: write counters to the user passed counter struct
3000 * NB: both 1->0 and 0->1 transitions are counted except for
3001 * RI where only 0->1 is counted.
3004 spin_lock_irqsave(&info->irq_spinlock,flags);
3005 cnow = info->icount;
3006 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3008 PUT_USER(error,cnow.cts, &p_cuser->cts);
3009 if (error) return error;
3010 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
3011 if (error) return error;
3012 PUT_USER(error,cnow.rng, &p_cuser->rng);
3013 if (error) return error;
3014 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
3015 if (error) return error;
3016 PUT_USER(error,cnow.rx, &p_cuser->rx);
3017 if (error) return error;
3018 PUT_USER(error,cnow.tx, &p_cuser->tx);
3019 if (error) return error;
3020 PUT_USER(error,cnow.frame, &p_cuser->frame);
3021 if (error) return error;
3022 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
3023 if (error) return error;
3024 PUT_USER(error,cnow.parity, &p_cuser->parity);
3025 if (error) return error;
3026 PUT_USER(error,cnow.brk, &p_cuser->brk);
3027 if (error) return error;
3028 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
3029 if (error) return error;
3032 return -ENOIOCTLCMD;
3037 /* mgsl_set_termios()
3039 * Set new termios settings
3043 * tty pointer to tty structure
3044 * termios pointer to buffer to hold returned old termios
3046 * Return Value: None
3048 static void mgsl_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
3050 struct mgsl_struct *info = (struct mgsl_struct *)tty->driver_data;
3051 unsigned long flags;
3053 if (debug_level >= DEBUG_LEVEL_INFO)
3054 printk("%s(%d):mgsl_set_termios %s\n", __FILE__,__LINE__,
3055 tty->driver->name );
3057 mgsl_change_params(info);
3059 /* Handle transition to B0 status */
3060 if (old_termios->c_cflag & CBAUD &&
3061 !(tty->termios->c_cflag & CBAUD)) {
3062 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
3063 spin_lock_irqsave(&info->irq_spinlock,flags);
3064 usc_set_serial_signals(info);
3065 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3068 /* Handle transition away from B0 status */
3069 if (!(old_termios->c_cflag & CBAUD) &&
3070 tty->termios->c_cflag & CBAUD) {
3071 info->serial_signals |= SerialSignal_DTR;
3072 if (!(tty->termios->c_cflag & CRTSCTS) ||
3073 !test_bit(TTY_THROTTLED, &tty->flags)) {
3074 info->serial_signals |= SerialSignal_RTS;
3076 spin_lock_irqsave(&info->irq_spinlock,flags);
3077 usc_set_serial_signals(info);
3078 spin_unlock_irqrestore(&info->irq_spinlock,flags);
3081 /* Handle turning off CRTSCTS */
3082 if (old_termios->c_cflag & CRTSCTS &&
3083 !(tty->termios->c_cflag & CRTSCTS)) {
3084 tty->hw_stopped = 0;
3088 } /* end of mgsl_set_termios() */
3092 * Called when port is closed. Wait for remaining data to be
3093 * sent. Disable port and free resources.
3097 * tty pointer to open tty structure
3098 * filp pointer to open file object
3100 * Return Value: None
3102 static void mgsl_close(struct tty_struct *tty, struct file * filp)
3104 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3106 if (mgsl_paranoia_check(info, tty->name, "mgsl_close"))
3109 if (debug_level >= DEBUG_LEVEL_INFO)
3110 printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
3111 __FILE__,__LINE__, info->device_name, info->count);
3116 if (tty_hung_up_p(filp))
3119 if ((tty->count == 1) && (info->count != 1)) {
3121 * tty->count is 1 and the tty structure will be freed.
3122 * info->count should be one in this case.
3123 * if it's not, correct it so that the port is shutdown.
3125 printk("mgsl_close: bad refcount; tty->count is 1, "
3126 "info->count is %d\n", info->count);
3132 /* if at least one open remaining, leave hardware active */
3136 info->flags |= ASYNC_CLOSING;
3138 /* set tty->closing to notify line discipline to
3139 * only process XON/XOFF characters. Only the N_TTY
3140 * discipline appears to use this (ppp does not).
3144 /* wait for transmit data to clear all layers */
3146 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
3147 if (debug_level >= DEBUG_LEVEL_INFO)
3148 printk("%s(%d):mgsl_close(%s) calling tty_wait_until_sent\n",
3149 __FILE__,__LINE__, info->device_name );
3150 tty_wait_until_sent(tty, info->closing_wait);
3153 if (info->flags & ASYNC_INITIALIZED)
3154 mgsl_wait_until_sent(tty, info->timeout);
3156 if (tty->driver->flush_buffer)
3157 tty->driver->flush_buffer(tty);
3159 tty_ldisc_flush(tty);
3166 if (info->blocked_open) {
3167 if (info->close_delay) {
3168 msleep_interruptible(jiffies_to_msecs(info->close_delay));
3170 wake_up_interruptible(&info->open_wait);
3173 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
3175 wake_up_interruptible(&info->close_wait);
3178 if (debug_level >= DEBUG_LEVEL_INFO)
3179 printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,
3180 tty->driver->name, info->count);
3182 } /* end of mgsl_close() */
3184 /* mgsl_wait_until_sent()
3186 * Wait until the transmitter is empty.
3190 * tty pointer to tty info structure
3191 * timeout time to wait for send completion
3193 * Return Value: None
3195 static void mgsl_wait_until_sent(struct tty_struct *tty, int timeout)
3197 struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
3198 unsigned long orig_jiffies, char_time;
3203 if (debug_level >= DEBUG_LEVEL_INFO)
3204 printk("%s(%d):mgsl_wait_until_sent(%s) entry\n",
3205 __FILE__,__LINE__, info->device_name );
3207 if (mgsl_paranoia_check(info, tty->name, "mgsl_wait_until_sent"))
3210 if (!(info->flags & ASYNC_INITIALIZED))
3213 orig_jiffies = jiffies;
3215 /* Set check interval to 1/5 of estimated time to
3216 * send a character, and make it at least 1. The check
3217 * interval should also be less than the timeout.
3218 * Note: use tight timings here to satisfy the NIST-PCTS.
3221 if ( info->params.data_rate ) {
3222 char_time = info->timeout/(32 * 5);
3229 char_time = min_t(unsigned long, char_time, timeout);
3231 if ( info->params.mode == MGSL_MODE_HDLC ||
3232 info->params.mode == MGSL_MODE_RAW ) {
3233 while (info->tx_active) {
3234 msleep_interruptible(jiffies_to_msecs(char_time));
3235 if (signal_pending(current))
3237 if (timeout && time_after(jiffies, orig_jiffies + timeout))
3241 while (!(usc_InReg(info,TCSR) & TXSTATUS_ALL_SENT) &&
3243 msleep_interruptible(jiffies_to_msecs(char_time));
3244 if (signal_pending(current))
3246 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);
3281 info->flags &= ~ASYNC_NORMAL_ACTIVE;
3284 wake_up_interruptible(&info->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->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->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->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->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->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->flags & ASYNC_INITIALIZED)){
3356 retval = (info->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->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->count );
3382 set_current_state(TASK_RUNNING);
3383 remove_wait_queue(&info->open_wait, &wait);
3387 info->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->count );
3394 info->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;
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->count);
3438 /* If port is closing, signal caller to try again */
3439 if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
3440 if (info->flags & ASYNC_CLOSING)
3441 interruptible_sleep_on(&info->close_wait);
3442 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
3443 -EAGAIN : -ERESTARTSYS);
3447 info->tty->low_latency = (info->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->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->tty = NULL; /* tty layer will release tty struct */
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(info->phys_memory_base,0x40000);
4148 if (!info->memory_base) {
4149 printk( "%s(%d):Cant map shared memory on device %s MemAddr=%08X\n",
4150 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4154 if ( !mgsl_memory_test(info) ) {
4155 printk( "%s(%d):Failed shared memory test %s MemAddr=%08X\n",
4156 __FILE__,__LINE__,info->device_name, info->phys_memory_base );
4160 info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE) + info->lcr_offset;
4161 if (!info->lcr_base) {
4162 printk( "%s(%d):Cant map LCR memory on device %s MemAddr=%08X\n",
4163 __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
4168 /* claim DMA channel */
4170 if (request_dma(info->dma_level,info->device_name) < 0){
4171 printk( "%s(%d):Cant request DMA channel on device %s DMA=%d\n",
4172 __FILE__,__LINE__,info->device_name, info->dma_level );
4173 mgsl_release_resources( info );
4176 info->dma_requested = true;
4178 /* ISA adapter uses bus master DMA */
4179 set_dma_mode(info->dma_level,DMA_MODE_CASCADE);
4180 enable_dma(info->dma_level);
4183 if ( mgsl_allocate_dma_buffers(info) < 0 ) {
4184 printk( "%s(%d):Cant allocate DMA buffers on device %s DMA=%d\n",
4185 __FILE__,__LINE__,info->device_name, info->dma_level );
4191 mgsl_release_resources(info);
4194 } /* end of mgsl_claim_resources() */
4196 static void mgsl_release_resources(struct mgsl_struct *info)
4198 if ( debug_level >= DEBUG_LEVEL_INFO )
4199 printk( "%s(%d):mgsl_release_resources(%s) entry\n",
4200 __FILE__,__LINE__,info->device_name );
4202 if ( info->irq_requested ) {
4203 free_irq(info->irq_level, info);
4204 info->irq_requested = false;
4206 if ( info->dma_requested ) {
4207 disable_dma(info->dma_level);
4208 free_dma(info->dma_level);
4209 info->dma_requested = false;
4211 mgsl_free_dma_buffers(info);
4212 mgsl_free_intermediate_rxbuffer_memory(info);
4213 mgsl_free_intermediate_txbuffer_memory(info);
4215 if ( info->io_addr_requested ) {
4216 release_region(info->io_base,info->io_addr_size);
4217 info->io_addr_requested = false;
4219 if ( info->shared_mem_requested ) {
4220 release_mem_region(info->phys_memory_base,0x40000);
4221 info->shared_mem_requested = false;
4223 if ( info->lcr_mem_requested ) {
4224 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
4225 info->lcr_mem_requested = false;
4227 if (info->memory_base){
4228 iounmap(info->memory_base);
4229 info->memory_base = NULL;
4231 if (info->lcr_base){
4232 iounmap(info->lcr_base - info->lcr_offset);
4233 info->lcr_base = NULL;
4236 if ( debug_level >= DEBUG_LEVEL_INFO )
4237 printk( "%s(%d):mgsl_release_resources(%s) exit\n",
4238 __FILE__,__LINE__,info->device_name );
4240 } /* end of mgsl_release_resources() */
4242 /* mgsl_add_device()
4244 * Add the specified device instance data structure to the
4245 * global linked list of devices and increment the device count.
4247 * Arguments: info pointer to device instance data
4248 * Return Value: None
4250 static void mgsl_add_device( struct mgsl_struct *info )
4252 info->next_device = NULL;
4253 info->line = mgsl_device_count;
4254 sprintf(info->device_name,"ttySL%d",info->line);
4256 if (info->line < MAX_TOTAL_DEVICES) {
4257 if (maxframe[info->line])
4258 info->max_frame_size = maxframe[info->line];
4259 info->dosyncppp = dosyncppp[info->line];
4261 if (txdmabufs[info->line]) {
4262 info->num_tx_dma_buffers = txdmabufs[info->line];
4263 if (info->num_tx_dma_buffers < 1)
4264 info->num_tx_dma_buffers = 1;
4267 if (txholdbufs[info->line]) {
4268 info->num_tx_holding_buffers = txholdbufs[info->line];
4269 if (info->num_tx_holding_buffers < 1)
4270 info->num_tx_holding_buffers = 1;
4271 else if (info->num_tx_holding_buffers > MAX_TX_HOLDING_BUFFERS)
4272 info->num_tx_holding_buffers = MAX_TX_HOLDING_BUFFERS;
4276 mgsl_device_count++;
4278 if ( !mgsl_device_list )
4279 mgsl_device_list = info;
4281 struct mgsl_struct *current_dev = mgsl_device_list;
4282 while( current_dev->next_device )
4283 current_dev = current_dev->next_device;
4284 current_dev->next_device = info;
4287 if ( info->max_frame_size < 4096 )
4288 info->max_frame_size = 4096;
4289 else if ( info->max_frame_size > 65535 )
4290 info->max_frame_size = 65535;
4292 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
4293 printk( "SyncLink PCI v%d %s: IO=%04X IRQ=%d Mem=%08X,%08X MaxFrameSize=%u\n",
4294 info->hw_version + 1, info->device_name, info->io_base, info->irq_level,
4295 info->phys_memory_base, info->phys_lcr_base,
4296 info->max_frame_size );
4298 printk( "SyncLink ISA %s: IO=%04X IRQ=%d DMA=%d MaxFrameSize=%u\n",
4299 info->device_name, info->io_base, info->irq_level, info->dma_level,
4300 info->max_frame_size );
4303 #if SYNCLINK_GENERIC_HDLC
4307 } /* end of mgsl_add_device() */
4309 /* mgsl_allocate_device()
4311 * Allocate and initialize a device instance structure
4314 * Return Value: pointer to mgsl_struct if success, otherwise NULL
4316 static struct mgsl_struct* mgsl_allocate_device(void)
4318 struct mgsl_struct *info;
4320 info = kzalloc(sizeof(struct mgsl_struct),
4324 printk("Error can't allocate device instance data\n");
4326 info->magic = MGSL_MAGIC;
4327 INIT_WORK(&info->task, mgsl_bh_handler);
4328 info->max_frame_size = 4096;
4329 info->close_delay = 5*HZ/10;
4330 info->closing_wait = 30*HZ;
4331 init_waitqueue_head(&info->open_wait);
4332 init_waitqueue_head(&info->close_wait);
4333 init_waitqueue_head(&info->status_event_wait_q);
4334 init_waitqueue_head(&info->event_wait_q);
4335 spin_lock_init(&info->irq_spinlock);
4336 spin_lock_init(&info->netlock);
4337 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
4338 info->idle_mode = HDLC_TXIDLE_FLAGS;
4339 info->num_tx_dma_buffers = 1;
4340 info->num_tx_holding_buffers = 0;
4345 } /* end of mgsl_allocate_device()*/
4347 static const struct tty_operations mgsl_ops = {
4349 .close = mgsl_close,
4350 .write = mgsl_write,
4351 .put_char = mgsl_put_char,
4352 .flush_chars = mgsl_flush_chars,
4353 .write_room = mgsl_write_room,
4354 .chars_in_buffer = mgsl_chars_in_buffer,
4355 .flush_buffer = mgsl_flush_buffer,
4356 .ioctl = mgsl_ioctl,
4357 .throttle = mgsl_throttle,
4358 .unthrottle = mgsl_unthrottle,
4359 .send_xchar = mgsl_send_xchar,
4360 .break_ctl = mgsl_break,
4361 .wait_until_sent = mgsl_wait_until_sent,
4362 .read_proc = mgsl_read_proc,
4363 .set_termios = mgsl_set_termios,
4365 .start = mgsl_start,
4366 .hangup = mgsl_hangup,
4367 .tiocmget = tiocmget,
4368 .tiocmset = tiocmset,
4372 * perform tty device initialization
4374 static int mgsl_init_tty(void)
4378 serial_driver = alloc_tty_driver(128);
4382 serial_driver->owner = THIS_MODULE;
4383 serial_driver->driver_name = "synclink";
4384 serial_driver->name = "ttySL";
4385 serial_driver->major = ttymajor;
4386 serial_driver->minor_start = 64;
4387 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4388 serial_driver->subtype = SERIAL_TYPE_NORMAL;
4389 serial_driver->init_termios = tty_std_termios;
4390 serial_driver->init_termios.c_cflag =
4391 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4392 serial_driver->init_termios.c_ispeed = 9600;
4393 serial_driver->init_termios.c_ospeed = 9600;
4394 serial_driver->flags = TTY_DRIVER_REAL_RAW;
4395 tty_set_operations(serial_driver, &mgsl_ops);
4396 if ((rc = tty_register_driver(serial_driver)) < 0) {
4397 printk("%s(%d):Couldn't register serial driver\n",
4399 put_tty_driver(serial_driver);
4400 serial_driver = NULL;
4404 printk("%s %s, tty major#%d\n",
4405 driver_name, driver_version,
4406 serial_driver->major);
4410 /* enumerate user specified ISA adapters
4412 static void mgsl_enum_isa_devices(void)
4414 struct mgsl_struct *info;
4417 /* Check for user specified ISA devices */
4419 for (i=0 ;(i < MAX_ISA_DEVICES) && io[i] && irq[i]; i++){
4420 if ( debug_level >= DEBUG_LEVEL_INFO )
4421 printk("ISA device specified io=%04X,irq=%d,dma=%d\n",
4422 io[i], irq[i], dma[i] );
4424 info = mgsl_allocate_device();
4426 /* error allocating device instance data */
4427 if ( debug_level >= DEBUG_LEVEL_ERROR )
4428 printk( "can't allocate device instance data.\n");
4432 /* Copy user configuration info to device instance data */
4433 info->io_base = (unsigned int)io[i];
4434 info->irq_level = (unsigned int)irq[i];
4435 info->irq_level = irq_canonicalize(info->irq_level);
4436 info->dma_level = (unsigned int)dma[i];
4437 info->bus_type = MGSL_BUS_TYPE_ISA;
4438 info->io_addr_size = 16;
4439 info->irq_flags = 0;
4441 mgsl_add_device( info );
4445 static void synclink_cleanup(void)
4448 struct mgsl_struct *info;
4449 struct mgsl_struct *tmp;
4451 printk("Unloading %s: %s\n", driver_name, driver_version);
4453 if (serial_driver) {
4454 if ((rc = tty_unregister_driver(serial_driver)))
4455 printk("%s(%d) failed to unregister tty driver err=%d\n",
4456 __FILE__,__LINE__,rc);
4457 put_tty_driver(serial_driver);
4460 info = mgsl_device_list;
4462 #if SYNCLINK_GENERIC_HDLC
4465 mgsl_release_resources(info);
4467 info = info->next_device;
4472 pci_unregister_driver(&synclink_pci_driver);
4475 static int __init synclink_init(void)
4479 if (break_on_load) {
4480 mgsl_get_text_ptr();
4484 printk("%s %s\n", driver_name, driver_version);
4486 mgsl_enum_isa_devices();
4487 if ((rc = pci_register_driver(&synclink_pci_driver)) < 0)
4488 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4490 pci_registered = true;
4492 if ((rc = mgsl_init_tty()) < 0)
4502 static void __exit synclink_exit(void)
4507 module_init(synclink_init);
4508 module_exit(synclink_exit);
4513 * Issue a USC Receive/Transmit command to the
4514 * Channel Command/Address Register (CCAR).
4518 * The command is encoded in the most significant 5 bits <15..11>
4519 * of the CCAR value. Bits <10..7> of the CCAR must be preserved
4520 * and Bits <6..0> must be written as zeros.
4524 * info pointer to device information structure
4525 * Cmd command mask (use symbolic macros)
4531 static void usc_RTCmd( struct mgsl_struct *info, u16 Cmd )
4533 /* output command to CCAR in bits <15..11> */
4534 /* preserve bits <10..7>, bits <6..0> must be zero */
4536 outw( Cmd + info->loopback_bits, info->io_base + CCAR );
4538 /* Read to flush write to CCAR */
4539 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4540 inw( info->io_base + CCAR );
4542 } /* end of usc_RTCmd() */
4547 * Issue a DMA command to the DMA Command/Address Register (DCAR).
4551 * info pointer to device information structure
4552 * Cmd DMA command mask (usc_DmaCmd_XX Macros)
4558 static void usc_DmaCmd( struct mgsl_struct *info, u16 Cmd )
4560 /* write command mask to DCAR */
4561 outw( Cmd + info->mbre_bit, info->io_base );
4563 /* Read to flush write to DCAR */
4564 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4565 inw( info->io_base );
4567 } /* end of usc_DmaCmd() */
4572 * Write a 16-bit value to a USC DMA register
4576 * info pointer to device info structure
4577 * RegAddr register address (number) for write
4578 * RegValue 16-bit value to write to register
4585 static void usc_OutDmaReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4587 /* Note: The DCAR is located at the adapter base address */
4588 /* Note: must preserve state of BIT8 in DCAR */
4590 outw( RegAddr + info->mbre_bit, info->io_base );
4591 outw( RegValue, info->io_base );
4593 /* Read to flush write to DCAR */
4594 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4595 inw( info->io_base );
4597 } /* end of usc_OutDmaReg() */
4602 * Read a 16-bit value from a DMA register
4606 * info pointer to device info structure
4607 * RegAddr register address (number) to read from
4611 * The 16-bit value read from register
4614 static u16 usc_InDmaReg( struct mgsl_struct *info, u16 RegAddr )
4616 /* Note: The DCAR is located at the adapter base address */
4617 /* Note: must preserve state of BIT8 in DCAR */
4619 outw( RegAddr + info->mbre_bit, info->io_base );
4620 return inw( info->io_base );
4622 } /* end of usc_InDmaReg() */
4628 * Write a 16-bit value to a USC serial channel register
4632 * info pointer to device info structure
4633 * RegAddr register address (number) to write to
4634 * RegValue 16-bit value to write to register
4641 static void usc_OutReg( struct mgsl_struct *info, u16 RegAddr, u16 RegValue )
4643 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4644 outw( RegValue, info->io_base + CCAR );
4646 /* Read to flush write to CCAR */
4647 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4648 inw( info->io_base + CCAR );
4650 } /* end of usc_OutReg() */
4655 * Reads a 16-bit value from a USC serial channel register
4659 * info pointer to device extension
4660 * RegAddr register address (number) to read from
4664 * 16-bit value read from register
4666 static u16 usc_InReg( struct mgsl_struct *info, u16 RegAddr )
4668 outw( RegAddr + info->loopback_bits, info->io_base + CCAR );
4669 return inw( info->io_base + CCAR );
4671 } /* end of usc_InReg() */
4673 /* usc_set_sdlc_mode()
4675 * Set up the adapter for SDLC DMA communications.
4677 * Arguments: info pointer to device instance data
4678 * Return Value: NONE
4680 static void usc_set_sdlc_mode( struct mgsl_struct *info )
4686 * determine if the IUSC on the adapter is pre-SL1660. If
4687 * not, take advantage of the UnderWait feature of more
4688 * modern chips. If an underrun occurs and this bit is set,
4689 * the transmitter will idle the programmed idle pattern
4690 * until the driver has time to service the underrun. Otherwise,
4691 * the dma controller may get the cycles previously requested
4692 * and begin transmitting queued tx data.
4694 usc_OutReg(info,TMCR,0x1f);
4695 RegValue=usc_InReg(info,TMDR);
4696 PreSL1660 = (RegValue == IUSC_PRE_SL1660);
4698 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
4701 ** Channel Mode Register (CMR)
4703 ** <15..14> 10 Tx Sub Modes, Send Flag on Underrun
4704 ** <13> 0 0 = Transmit Disabled (initially)
4705 ** <12> 0 1 = Consecutive Idles share common 0
4706 ** <11..8> 1110 Transmitter Mode = HDLC/SDLC Loop
4707 ** <7..4> 0000 Rx Sub Modes, addr/ctrl field handling
4708 ** <3..0> 0110 Receiver Mode = HDLC/SDLC
4710 ** 1000 1110 0000 0110 = 0x8e06
4714 /*--------------------------------------------------
4715 * ignore user options for UnderRun Actions and
4717 *--------------------------------------------------*/
4721 /* Channel mode Register (CMR)
4723 * <15..14> 00 Tx Sub modes, Underrun Action
4724 * <13> 0 1 = Send Preamble before opening flag
4725 * <12> 0 1 = Consecutive Idles share common 0
4726 * <11..8> 0110 Transmitter mode = HDLC/SDLC
4727 * <7..4> 0000 Rx Sub modes, addr/ctrl field handling
4728 * <3..0> 0110 Receiver mode = HDLC/SDLC
4730 * 0000 0110 0000 0110 = 0x0606
4732 if (info->params.mode == MGSL_MODE_RAW) {
4733 RegValue = 0x0001; /* Set Receive mode = external sync */
4735 usc_OutReg( info, IOCR, /* Set IOCR DCD is RxSync Detect Input */
4736 (unsigned short)((usc_InReg(info, IOCR) & ~(BIT13|BIT12)) | BIT12));
4740 * CMR <15> 0 Don't send CRC on Tx Underrun
4741 * CMR <14> x undefined
4742 * CMR <13> 0 Send preamble before openning sync
4743 * CMR <12> 0 Send 8-bit syncs, 1=send Syncs per TxLength
4746 * CMR <11-8) 0100 MonoSync
4748 * 0x00 0100 xxxx xxxx 04xx
4756 if ( info->params.flags & HDLC_FLAG_UNDERRUN_ABORT15 )
4758 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_FLAG )
4760 else if ( info->params.flags & HDLC_FLAG_UNDERRUN_CRC )
4761 RegValue |= BIT15 + BIT14;
4764 if ( info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE )
4768 if ( info->params.mode == MGSL_MODE_HDLC &&
4769 (info->params.flags & HDLC_FLAG_SHARE_ZERO) )
4772 if ( info->params.addr_filter != 0xff )
4774 /* set up receive address filtering */
4775 usc_OutReg( info, RSR, info->params.addr_filter );
4779 usc_OutReg( info, CMR, RegValue );
4780 info->cmr_value = RegValue;
4782 /* Receiver mode Register (RMR)
4784 * <15..13> 000 encoding
4785 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4786 * <10> 1 1 = Set CRC to all 1s (use for SDLC/HDLC)
4787 * <9> 0 1 = Include Receive chars in CRC
4788 * <8> 1 1 = Use Abort/PE bit as abort indicator
4789 * <7..6> 00 Even parity
4790 * <5> 0 parity disabled
4791 * <4..2> 000 Receive Char Length = 8 bits
4792 * <1..0> 00 Disable Receiver
4794 * 0000 0101 0000 0000 = 0x0500
4799 switch ( info->params.encoding ) {
4800 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4801 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4802 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4803 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4804 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4805 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4806 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4809 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4811 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4812 RegValue |= ( BIT12 | BIT10 | BIT9 );
4814 usc_OutReg( info, RMR, RegValue );
4816 /* Set the Receive count Limit Register (RCLR) to 0xffff. */
4817 /* When an opening flag of an SDLC frame is recognized the */
4818 /* Receive Character count (RCC) is loaded with the value in */
4819 /* RCLR. The RCC is decremented for each received byte. The */
4820 /* value of RCC is stored after the closing flag of the frame */
4821 /* allowing the frame size to be computed. */
4823 usc_OutReg( info, RCLR, RCLRVALUE );
4825 usc_RCmd( info, RCmd_SelectRicrdma_level );
4827 /* Receive Interrupt Control Register (RICR)
4829 * <15..8> ? RxFIFO DMA Request Level
4830 * <7> 0 Exited Hunt IA (Interrupt Arm)
4831 * <6> 0 Idle Received IA
4832 * <5> 0 Break/Abort IA
4834 * <3> 1 Queued status reflects oldest 2 bytes in FIFO
4836 * <1> 1 Rx Overrun IA
4837 * <0> 0 Select TC0 value for readback
4839 * 0000 0000 0000 1000 = 0x000a
4842 /* Carry over the Exit Hunt and Idle Received bits */
4843 /* in case they have been armed by usc_ArmEvents. */
4845 RegValue = usc_InReg( info, RICR ) & 0xc0;
4847 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4848 usc_OutReg( info, RICR, (u16)(0x030a | RegValue) );
4850 usc_OutReg( info, RICR, (u16)(0x140a | RegValue) );
4852 /* Unlatch all Rx status bits and clear Rx status IRQ Pending */
4854 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
4855 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
4857 /* Transmit mode Register (TMR)
4859 * <15..13> 000 encoding
4860 * <12..11> 00 FCS = 16bit CRC CCITT (x15 + x12 + x5 + 1)
4861 * <10> 1 1 = Start CRC as all 1s (use for SDLC/HDLC)
4862 * <9> 0 1 = Tx CRC Enabled
4863 * <8> 0 1 = Append CRC to end of transmit frame
4864 * <7..6> 00 Transmit parity Even
4865 * <5> 0 Transmit parity Disabled
4866 * <4..2> 000 Tx Char Length = 8 bits
4867 * <1..0> 00 Disable Transmitter
4869 * 0000 0100 0000 0000 = 0x0400
4874 switch ( info->params.encoding ) {
4875 case HDLC_ENCODING_NRZB: RegValue |= BIT13; break;
4876 case HDLC_ENCODING_NRZI_MARK: RegValue |= BIT14; break;
4877 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT14 + BIT13; break;
4878 case HDLC_ENCODING_BIPHASE_MARK: RegValue |= BIT15; break;
4879 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT15 + BIT13; break;
4880 case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14; break;
4881 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT15 + BIT14 + BIT13; break;
4884 if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_16_CCITT )
4885 RegValue |= BIT9 + BIT8;
4886 else if ( (info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_32_CCITT )
4887 RegValue |= ( BIT12 | BIT10 | BIT9 | BIT8);
4889 usc_OutReg( info, TMR, RegValue );
4891 usc_set_txidle( info );
4894 usc_TCmd( info, TCmd_SelectTicrdma_level );
4896 /* Transmit Interrupt Control Register (TICR)
4898 * <15..8> ? Transmit FIFO DMA Level
4899 * <7> 0 Present IA (Interrupt Arm)
4900 * <6> 0 Idle Sent IA
4901 * <5> 1 Abort Sent IA
4902 * <4> 1 EOF/EOM Sent IA
4904 * <2> 1 1 = Wait for SW Trigger to Start Frame
4905 * <1> 1 Tx Underrun IA
4906 * <0> 0 TC0 constant on read back
4908 * 0000 0000 0011 0110 = 0x0036
4911 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
4912 usc_OutReg( info, TICR, 0x0736 );
4914 usc_OutReg( info, TICR, 0x1436 );
4916 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
4917 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
4920 ** Transmit Command/Status Register (TCSR)
4922 ** <15..12> 0000 TCmd
4923 ** <11> 0/1 UnderWait
4924 ** <10..08> 000 TxIdle
4928 ** <4> x EOF/EOM Sent
4934 ** 0000 0000 0000 0000 = 0x0000
4936 info->tcsr_value = 0;
4939 info->tcsr_value |= TCSR_UNDERWAIT;
4941 usc_OutReg( info, TCSR, info->tcsr_value );
4943 /* Clock mode Control Register (CMCR)
4945 * <15..14> 00 counter 1 Source = Disabled
4946 * <13..12> 00 counter 0 Source = Disabled
4947 * <11..10> 11 BRG1 Input is TxC Pin
4948 * <9..8> 11 BRG0 Input is TxC Pin
4949 * <7..6> 01 DPLL Input is BRG1 Output
4950 * <5..3> XXX TxCLK comes from Port 0
4951 * <2..0> XXX RxCLK comes from Port 1
4953 * 0000 1111 0111 0111 = 0x0f77
4958 if ( info->params.flags & HDLC_FLAG_RXC_DPLL )
4959 RegValue |= 0x0003; /* RxCLK from DPLL */
4960 else if ( info->params.flags & HDLC_FLAG_RXC_BRG )
4961 RegValue |= 0x0004; /* RxCLK from BRG0 */
4962 else if ( info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4963 RegValue |= 0x0006; /* RxCLK from TXC Input */
4965 RegValue |= 0x0007; /* RxCLK from Port1 */
4967 if ( info->params.flags & HDLC_FLAG_TXC_DPLL )
4968 RegValue |= 0x0018; /* TxCLK from DPLL */
4969 else if ( info->params.flags & HDLC_FLAG_TXC_BRG )
4970 RegValue |= 0x0020; /* TxCLK from BRG0 */
4971 else if ( info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4972 RegValue |= 0x0038; /* RxCLK from TXC Input */
4974 RegValue |= 0x0030; /* TxCLK from Port0 */
4976 usc_OutReg( info, CMCR, RegValue );
4979 /* Hardware Configuration Register (HCR)
4981 * <15..14> 00 CTR0 Divisor:00=32,01=16,10=8,11=4
4982 * <13> 0 CTR1DSel:0=CTR0Div determines CTR0Div
4983 * <12> 0 CVOK:0=report code violation in biphase
4984 * <11..10> 00 DPLL Divisor:00=32,01=16,10=8,11=4
4985 * <9..8> XX DPLL mode:00=disable,01=NRZ,10=Biphase,11=Biphase Level
4986 * <7..6> 00 reserved
4987 * <5> 0 BRG1 mode:0=continuous,1=single cycle
4989 * <3..2> 00 reserved
4990 * <1> 0 BRG0 mode:0=continuous,1=single cycle
4996 if ( info->params.flags & (HDLC_FLAG_RXC_DPLL + HDLC_FLAG_TXC_DPLL) ) {
5001 /* DPLL is enabled. Use BRG1 to provide continuous reference clock */
5002 /* for DPLL. DPLL mode in HCR is dependent on the encoding used. */
5004 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5005 XtalSpeed = 11059200;
5007 XtalSpeed = 14745600;
5009 if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
5013 else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
5020 /* Tc = (Xtal/Speed) - 1 */
5021 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5022 /* then rounding up gives a more precise time constant. Instead */
5023 /* of rounding up and then subtracting 1 we just don't subtract */
5024 /* the one in this case. */
5026 /*--------------------------------------------------
5027 * ejz: for DPLL mode, application should use the
5028 * same clock speed as the partner system, even
5029 * though clocking is derived from the input RxData.
5030 * In case the user uses a 0 for the clock speed,
5031 * default to 0xffffffff and don't try to divide by
5033 *--------------------------------------------------*/
5034 if ( info->params.clock_speed )
5036 Tc = (u16)((XtalSpeed/DpllDivisor)/info->params.clock_speed);
5037 if ( !((((XtalSpeed/DpllDivisor) % info->params.clock_speed) * 2)
5038 / info->params.clock_speed) )
5045 /* Write 16-bit Time Constant for BRG1 */
5046 usc_OutReg( info, TC1R, Tc );
5048 RegValue |= BIT4; /* enable BRG1 */
5050 switch ( info->params.encoding ) {
5051 case HDLC_ENCODING_NRZ:
5052 case HDLC_ENCODING_NRZB:
5053 case HDLC_ENCODING_NRZI_MARK:
5054 case HDLC_ENCODING_NRZI_SPACE: RegValue |= BIT8; break;
5055 case HDLC_ENCODING_BIPHASE_MARK:
5056 case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT9; break;
5057 case HDLC_ENCODING_BIPHASE_LEVEL:
5058 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: RegValue |= BIT9 + BIT8; break;
5062 usc_OutReg( info, HCR, RegValue );
5065 /* Channel Control/status Register (CCSR)
5067 * <15> X RCC FIFO Overflow status (RO)
5068 * <14> X RCC FIFO Not Empty status (RO)
5069 * <13> 0 1 = Clear RCC FIFO (WO)
5070 * <12> X DPLL Sync (RW)
5071 * <11> X DPLL 2 Missed Clocks status (RO)
5072 * <10> X DPLL 1 Missed Clock status (RO)
5073 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
5074 * <7> X SDLC Loop On status (RO)
5075 * <6> X SDLC Loop Send status (RO)
5076 * <5> 1 Bypass counters for TxClk and RxClk (RW)
5077 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
5078 * <1..0> 00 reserved
5080 * 0000 0000 0010 0000 = 0x0020
5083 usc_OutReg( info, CCSR, 0x1020 );
5086 if ( info->params.flags & HDLC_FLAG_AUTO_CTS ) {
5087 usc_OutReg( info, SICR,
5088 (u16)(usc_InReg(info,SICR) | SICR_CTS_INACTIVE) );
5092 /* enable Master Interrupt Enable bit (MIE) */
5093 usc_EnableMasterIrqBit( info );
5095 usc_ClearIrqPendingBits( info, RECEIVE_STATUS + RECEIVE_DATA +
5096 TRANSMIT_STATUS + TRANSMIT_DATA + MISC);
5098 /* arm RCC underflow interrupt */
5099 usc_OutReg(info, SICR, (u16)(usc_InReg(info,SICR) | BIT3));
5100 usc_EnableInterrupts(info, MISC);
5103 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5104 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5105 info->mbre_bit = BIT8;
5106 outw( BIT8, info->io_base ); /* set Master Bus Enable (DCAR) */
5108 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
5109 /* Enable DMAEN (Port 7, Bit 14) */
5110 /* This connects the DMA request signal to the ISA bus */
5111 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT15) & ~BIT14));
5114 /* DMA Control Register (DCR)
5116 * <15..14> 10 Priority mode = Alternating Tx/Rx
5117 * 01 Rx has priority
5118 * 00 Tx has priority
5120 * <13> 1 Enable Priority Preempt per DCR<15..14>
5121 * (WARNING DCR<11..10> must be 00 when this is 1)
5122 * 0 Choose activate channel per DCR<11..10>
5124 * <12> 0 Little Endian for Array/List
5125 * <11..10> 00 Both Channels can use each bus grant
5126 * <9..6> 0000 reserved
5127 * <5> 0 7 CLK - Minimum Bus Re-request Interval
5128 * <4> 0 1 = drive D/C and S/D pins
5129 * <3> 1 1 = Add one wait state to all DMA cycles.
5130 * <2> 0 1 = Strobe /UAS on every transfer.
5131 * <1..0> 11 Addr incrementing only affects LS24 bits
5133 * 0110 0000 0000 1011 = 0x600b
5136 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5137 /* PCI adapter does not need DMA wait state */
5138 usc_OutDmaReg( info, DCR, 0xa00b );
5141 usc_OutDmaReg( info, DCR, 0x800b );
5144 /* Receive DMA mode Register (RDMR)
5146 * <15..14> 11 DMA mode = Linked List Buffer mode
5147 * <13> 1 RSBinA/L = store Rx status Block in Arrary/List entry
5148 * <12> 1 Clear count of List Entry after fetching
5149 * <11..10> 00 Address mode = Increment
5150 * <9> 1 Terminate Buffer on RxBound
5151 * <8> 0 Bus Width = 16bits
5152 * <7..0> ? status Bits (write as 0s)
5154 * 1111 0010 0000 0000 = 0xf200
5157 usc_OutDmaReg( info, RDMR, 0xf200 );
5160 /* Transmit DMA mode Register (TDMR)
5162 * <15..14> 11 DMA mode = Linked List Buffer mode
5163 * <13> 1 TCBinA/L = fetch Tx Control Block from List entry
5164 * <12> 1 Clear count of List Entry after fetching
5165 * <11..10> 00 Address mode = Increment
5166 * <9> 1 Terminate Buffer on end of frame
5167 * <8> 0 Bus Width = 16bits
5168 * <7..0> ? status Bits (Read Only so write as 0)
5170 * 1111 0010 0000 0000 = 0xf200
5173 usc_OutDmaReg( info, TDMR, 0xf200 );
5176 /* DMA Interrupt Control Register (DICR)
5178 * <15> 1 DMA Interrupt Enable
5179 * <14> 0 1 = Disable IEO from USC
5180 * <13> 0 1 = Don't provide vector during IntAck
5181 * <12> 1 1 = Include status in Vector
5182 * <10..2> 0 reserved, Must be 0s
5183 * <1> 0 1 = Rx DMA Interrupt Enabled
5184 * <0> 0 1 = Tx DMA Interrupt Enabled
5186 * 1001 0000 0000 0000 = 0x9000
5189 usc_OutDmaReg( info, DICR, 0x9000 );
5191 usc_InDmaReg( info, RDMR ); /* clear pending receive DMA IRQ bits */
5192 usc_InDmaReg( info, TDMR ); /* clear pending transmit DMA IRQ bits */
5193 usc_OutDmaReg( info, CDIR, 0x0303 ); /* clear IUS and Pending for Tx and Rx */
5195 /* Channel Control Register (CCR)
5197 * <15..14> 10 Use 32-bit Tx Control Blocks (TCBs)
5198 * <13> 0 Trigger Tx on SW Command Disabled
5199 * <12> 0 Flag Preamble Disabled
5200 * <11..10> 00 Preamble Length
5201 * <9..8> 00 Preamble Pattern
5202 * <7..6> 10 Use 32-bit Rx status Blocks (RSBs)
5203 * <5> 0 Trigger Rx on SW Command Disabled
5206 * 1000 0000 1000 0000 = 0x8080
5211 switch ( info->params.preamble_length ) {
5212 case HDLC_PREAMBLE_LENGTH_16BITS: RegValue |= BIT10; break;
5213 case HDLC_PREAMBLE_LENGTH_32BITS: RegValue |= BIT11; break;
5214 case HDLC_PREAMBLE_LENGTH_64BITS: RegValue |= BIT11 + BIT10; break;
5217 switch ( info->params.preamble ) {
5218 case HDLC_PREAMBLE_PATTERN_FLAGS: RegValue |= BIT8 + BIT12; break;
5219 case HDLC_PREAMBLE_PATTERN_ONES: RegValue |= BIT8; break;
5220 case HDLC_PREAMBLE_PATTERN_10: RegValue |= BIT9; break;
5221 case HDLC_PREAMBLE_PATTERN_01: RegValue |= BIT9 + BIT8; break;
5224 usc_OutReg( info, CCR, RegValue );
5228 * Burst/Dwell Control Register
5230 * <15..8> 0x20 Maximum number of transfers per bus grant
5231 * <7..0> 0x00 Maximum number of clock cycles per bus grant
5234 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5235 /* don't limit bus occupancy on PCI adapter */
5236 usc_OutDmaReg( info, BDCR, 0x0000 );
5239 usc_OutDmaReg( info, BDCR, 0x2000 );
5241 usc_stop_transmitter(info);
5242 usc_stop_receiver(info);
5244 } /* end of usc_set_sdlc_mode() */
5246 /* usc_enable_loopback()
5248 * Set the 16C32 for internal loopback mode.
5249 * The TxCLK and RxCLK signals are generated from the BRG0 and
5250 * the TxD is looped back to the RxD internally.
5252 * Arguments: info pointer to device instance data
5253 * enable 1 = enable loopback, 0 = disable
5254 * Return Value: None
5256 static void usc_enable_loopback(struct mgsl_struct *info, int enable)
5259 /* blank external TXD output */
5260 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) | (BIT7+BIT6));
5262 /* Clock mode Control Register (CMCR)
5264 * <15..14> 00 counter 1 Disabled
5265 * <13..12> 00 counter 0 Disabled
5266 * <11..10> 11 BRG1 Input is TxC Pin
5267 * <9..8> 11 BRG0 Input is TxC Pin
5268 * <7..6> 01 DPLL Input is BRG1 Output
5269 * <5..3> 100 TxCLK comes from BRG0
5270 * <2..0> 100 RxCLK comes from BRG0
5272 * 0000 1111 0110 0100 = 0x0f64
5275 usc_OutReg( info, CMCR, 0x0f64 );
5277 /* Write 16-bit Time Constant for BRG0 */
5278 /* use clock speed if available, otherwise use 8 for diagnostics */
5279 if (info->params.clock_speed) {
5280 if (info->bus_type == MGSL_BUS_TYPE_PCI)
5281 usc_OutReg(info, TC0R, (u16)((11059200/info->params.clock_speed)-1));
5283 usc_OutReg(info, TC0R, (u16)((14745600/info->params.clock_speed)-1));
5285 usc_OutReg(info, TC0R, (u16)8);
5287 /* Hardware Configuration Register (HCR) Clear Bit 1, BRG0
5288 mode = Continuous Set Bit 0 to enable BRG0. */
5289 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5291 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5292 usc_OutReg(info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004));
5294 /* set Internal Data loopback mode */
5295 info->loopback_bits = 0x300;
5296 outw( 0x0300, info->io_base + CCAR );
5298 /* enable external TXD output */
5299 usc_OutReg(info,IOCR,usc_InReg(info,IOCR) & ~(BIT7+BIT6));
5301 /* clear Internal Data loopback mode */
5302 info->loopback_bits = 0;
5303 outw( 0,info->io_base + CCAR );
5306 } /* end of usc_enable_loopback() */
5308 /* usc_enable_aux_clock()
5310 * Enabled the AUX clock output at the specified frequency.
5314 * info pointer to device extension
5315 * data_rate data rate of clock in bits per second
5316 * A data rate of 0 disables the AUX clock.
5318 * Return Value: None
5320 static void usc_enable_aux_clock( struct mgsl_struct *info, u32 data_rate )
5326 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
5327 XtalSpeed = 11059200;
5329 XtalSpeed = 14745600;
5332 /* Tc = (Xtal/Speed) - 1 */
5333 /* If twice the remainder of (Xtal/Speed) is greater than Speed */
5334 /* then rounding up gives a more precise time constant. Instead */
5335 /* of rounding up and then subtracting 1 we just don't subtract */
5336 /* the one in this case. */
5339 Tc = (u16)(XtalSpeed/data_rate);
5340 if ( !(((XtalSpeed % data_rate) * 2) / data_rate) )
5343 /* Write 16-bit Time Constant for BRG0 */
5344 usc_OutReg( info, TC0R, Tc );
5347 * Hardware Configuration Register (HCR)
5348 * Clear Bit 1, BRG0 mode = Continuous
5349 * Set Bit 0 to enable BRG0.
5352 usc_OutReg( info, HCR, (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
5354 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
5355 usc_OutReg( info, IOCR, (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
5357 /* data rate == 0 so turn off BRG0 */
5358 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
5361 } /* end of usc_enable_aux_clock() */
5365 * usc_process_rxoverrun_sync()
5367 * This function processes a receive overrun by resetting the
5368 * receive DMA buffers and issuing a Purge Rx FIFO command
5369 * to allow the receiver to continue receiving.
5373 * info pointer to device extension
5375 * Return Value: None
5377 static void usc_process_rxoverrun_sync( struct mgsl_struct *info )
5381 int frame_start_index;
5382 bool start_of_frame_found = false;
5383 bool end_of_frame_found = false;
5384 bool reprogram_dma = false;
5386 DMABUFFERENTRY *buffer_list = info->rx_buffer_list;
5389 usc_DmaCmd( info, DmaCmd_PauseRxChannel );
5390 usc_RCmd( info, RCmd_EnterHuntmode );
5391 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5393 /* CurrentRxBuffer points to the 1st buffer of the next */
5394 /* possibly available receive frame. */
5396 frame_start_index = start_index = end_index = info->current_rx_buffer;
5398 /* Search for an unfinished string of buffers. This means */
5399 /* that a receive frame started (at least one buffer with */
5400 /* count set to zero) but there is no terminiting buffer */
5401 /* (status set to non-zero). */
5403 while( !buffer_list[end_index].count )
5405 /* Count field has been reset to zero by 16C32. */
5406 /* This buffer is currently in use. */
5408 if ( !start_of_frame_found )
5410 start_of_frame_found = true;
5411 frame_start_index = end_index;
5412 end_of_frame_found = false;
5415 if ( buffer_list[end_index].status )
5417 /* Status field has been set by 16C32. */
5418 /* This is the last buffer of a received frame. */
5420 /* We want to leave the buffers for this frame intact. */
5421 /* Move on to next possible frame. */
5423 start_of_frame_found = false;
5424 end_of_frame_found = true;
5427 /* advance to next buffer entry in linked list */
5429 if ( end_index == info->rx_buffer_count )
5432 if ( start_index == end_index )
5434 /* The entire list has been searched with all Counts == 0 and */
5435 /* all Status == 0. The receive buffers are */
5436 /* completely screwed, reset all receive buffers! */
5437 mgsl_reset_rx_dma_buffers( info );
5438 frame_start_index = 0;
5439 start_of_frame_found = false;
5440 reprogram_dma = true;
5445 if ( start_of_frame_found && !end_of_frame_found )
5447 /* There is an unfinished string of receive DMA buffers */
5448 /* as a result of the receiver overrun. */
5450 /* Reset the buffers for the unfinished frame */
5451 /* and reprogram the receive DMA controller to start */
5452 /* at the 1st buffer of unfinished frame. */
5454 start_index = frame_start_index;
5458 *((unsigned long *)&(info->rx_buffer_list[start_index++].count)) = DMABUFFERSIZE;
5460 /* Adjust index for wrap around. */
5461 if ( start_index == info->rx_buffer_count )
5464 } while( start_index != end_index );
5466 reprogram_dma = true;
5469 if ( reprogram_dma )
5471 usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
5472 usc_ClearIrqPendingBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5473 usc_UnlatchRxstatusBits(info, RECEIVE_DATA|RECEIVE_STATUS);
5475 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5477 /* This empties the receive FIFO and loads the RCC with RCLR */
5478 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5480 /* program 16C32 with physical address of 1st DMA buffer entry */
5481 phys_addr = info->rx_buffer_list[frame_start_index].phys_entry;
5482 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5483 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5485 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5486 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5487 usc_EnableInterrupts( info, RECEIVE_STATUS );
5489 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5490 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5492 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5493 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5494 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5495 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5496 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5498 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5502 /* This empties the receive FIFO and loads the RCC with RCLR */
5503 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5504 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5507 } /* end of usc_process_rxoverrun_sync() */
5509 /* usc_stop_receiver()
5511 * Disable USC receiver
5513 * Arguments: info pointer to device instance data
5514 * Return Value: None
5516 static void usc_stop_receiver( struct mgsl_struct *info )
5518 if (debug_level >= DEBUG_LEVEL_ISR)
5519 printk("%s(%d):usc_stop_receiver(%s)\n",
5520 __FILE__,__LINE__, info->device_name );
5522 /* Disable receive DMA channel. */
5523 /* This also disables receive DMA channel interrupts */
5524 usc_DmaCmd( info, DmaCmd_ResetRxChannel );
5526 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5527 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5528 usc_DisableInterrupts( info, RECEIVE_DATA + RECEIVE_STATUS );
5530 usc_EnableReceiver(info,DISABLE_UNCONDITIONAL);
5532 /* This empties the receive FIFO and loads the RCC with RCLR */
5533 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5534 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5536 info->rx_enabled = false;
5537 info->rx_overflow = false;
5538 info->rx_rcc_underrun = false;
5540 } /* end of stop_receiver() */
5542 /* usc_start_receiver()
5544 * Enable the USC receiver
5546 * Arguments: info pointer to device instance data
5547 * Return Value: None
5549 static void usc_start_receiver( struct mgsl_struct *info )
5553 if (debug_level >= DEBUG_LEVEL_ISR)
5554 printk("%s(%d):usc_start_receiver(%s)\n",
5555 __FILE__,__LINE__, info->device_name );
5557 mgsl_reset_rx_dma_buffers( info );
5558 usc_stop_receiver( info );
5560 usc_OutReg( info, CCSR, (u16)(usc_InReg(info,CCSR) | BIT13) );
5561 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5563 if ( info->params.mode == MGSL_MODE_HDLC ||
5564 info->params.mode == MGSL_MODE_RAW ) {
5565 /* DMA mode Transfers */
5566 /* Program the DMA controller. */
5567 /* Enable the DMA controller end of buffer interrupt. */
5569 /* program 16C32 with physical address of 1st DMA buffer entry */
5570 phys_addr = info->rx_buffer_list[0].phys_entry;
5571 usc_OutDmaReg( info, NRARL, (u16)phys_addr );
5572 usc_OutDmaReg( info, NRARU, (u16)(phys_addr >> 16) );
5574 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
5575 usc_ClearIrqPendingBits( info, RECEIVE_DATA + RECEIVE_STATUS );
5576 usc_EnableInterrupts( info, RECEIVE_STATUS );
5578 /* 1. Arm End of Buffer (EOB) Receive DMA Interrupt (BIT2 of RDIAR) */
5579 /* 2. Enable Receive DMA Interrupts (BIT1 of DICR) */
5581 usc_OutDmaReg( info, RDIAR, BIT3 + BIT2 );
5582 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT1) );
5583 usc_DmaCmd( info, DmaCmd_InitRxChannel );
5584 if ( info->params.flags & HDLC_FLAG_AUTO_DCD )
5585 usc_EnableReceiver(info,ENABLE_AUTO_DCD);
5587 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5589 usc_UnlatchRxstatusBits(info, RXSTATUS_ALL);
5590 usc_ClearIrqPendingBits(info, RECEIVE_DATA + RECEIVE_STATUS);
5591 usc_EnableInterrupts(info, RECEIVE_DATA);
5593 usc_RTCmd( info, RTCmd_PurgeRxFifo );
5594 usc_RCmd( info, RCmd_EnterHuntmode );
5596 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
5599 usc_OutReg( info, CCSR, 0x1020 );
5601 info->rx_enabled = true;
5603 } /* end of usc_start_receiver() */
5605 /* usc_start_transmitter()
5607 * Enable the USC transmitter and send a transmit frame if
5608 * one is loaded in the DMA buffers.
5610 * Arguments: info pointer to device instance data
5611 * Return Value: None
5613 static void usc_start_transmitter( struct mgsl_struct *info )
5616 unsigned int FrameSize;
5618 if (debug_level >= DEBUG_LEVEL_ISR)
5619 printk("%s(%d):usc_start_transmitter(%s)\n",
5620 __FILE__,__LINE__, info->device_name );
5622 if ( info->xmit_cnt ) {
5624 /* If auto RTS enabled and RTS is inactive, then assert */
5625 /* RTS and set a flag indicating that the driver should */
5626 /* negate RTS when the transmission completes. */
5628 info->drop_rts_on_tx_done = false;
5630 if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
5631 usc_get_serial_signals( info );
5632 if ( !(info->serial_signals & SerialSignal_RTS) ) {
5633 info->serial_signals |= SerialSignal_RTS;
5634 usc_set_serial_signals( info );
5635 info->drop_rts_on_tx_done = true;
5640 if ( info->params.mode == MGSL_MODE_ASYNC ) {
5641 if ( !info->tx_active ) {
5642 usc_UnlatchTxstatusBits(info, TXSTATUS_ALL);
5643 usc_ClearIrqPendingBits(info, TRANSMIT_STATUS + TRANSMIT_DATA);
5644 usc_EnableInterrupts(info, TRANSMIT_DATA);
5645 usc_load_txfifo(info);
5648 /* Disable transmit DMA controller while programming. */
5649 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5651 /* Transmit DMA buffer is loaded, so program USC */
5652 /* to send the frame contained in the buffers. */
5654 FrameSize = info->tx_buffer_list[info->start_tx_dma_buffer].rcc;
5656 /* if operating in Raw sync mode, reset the rcc component
5657 * of the tx dma buffer entry, otherwise, the serial controller
5658 * will send a closing sync char after this count.
5660 if ( info->params.mode == MGSL_MODE_RAW )
5661 info->tx_buffer_list[info->start_tx_dma_buffer].rcc = 0;
5663 /* Program the Transmit Character Length Register (TCLR) */
5664 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
5665 usc_OutReg( info, TCLR, (u16)FrameSize );
5667 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5669 /* Program the address of the 1st DMA Buffer Entry in linked list */
5670 phys_addr = info->tx_buffer_list[info->start_tx_dma_buffer].phys_entry;
5671 usc_OutDmaReg( info, NTARL, (u16)phys_addr );
5672 usc_OutDmaReg( info, NTARU, (u16)(phys_addr >> 16) );
5674 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5675 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
5676 usc_EnableInterrupts( info, TRANSMIT_STATUS );
5678 if ( info->params.mode == MGSL_MODE_RAW &&
5679 info->num_tx_dma_buffers > 1 ) {
5680 /* When running external sync mode, attempt to 'stream' transmit */
5681 /* by filling tx dma buffers as they become available. To do this */
5682 /* we need to enable Tx DMA EOB Status interrupts : */
5684 /* 1. Arm End of Buffer (EOB) Transmit DMA Interrupt (BIT2 of TDIAR) */
5685 /* 2. Enable Transmit DMA Interrupts (BIT0 of DICR) */
5687 usc_OutDmaReg( info, TDIAR, BIT2|BIT3 );
5688 usc_OutDmaReg( info, DICR, (u16)(usc_InDmaReg(info,DICR) | BIT0) );
5691 /* Initialize Transmit DMA Channel */
5692 usc_DmaCmd( info, DmaCmd_InitTxChannel );
5694 usc_TCmd( info, TCmd_SendFrame );
5696 mod_timer(&info->tx_timer, jiffies +
5697 msecs_to_jiffies(5000));
5699 info->tx_active = true;
5702 if ( !info->tx_enabled ) {
5703 info->tx_enabled = true;
5704 if ( info->params.flags & HDLC_FLAG_AUTO_CTS )
5705 usc_EnableTransmitter(info,ENABLE_AUTO_CTS);
5707 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
5710 } /* end of usc_start_transmitter() */
5712 /* usc_stop_transmitter()
5714 * Stops the transmitter and DMA
5716 * Arguments: info pointer to device isntance data
5717 * Return Value: None
5719 static void usc_stop_transmitter( struct mgsl_struct *info )
5721 if (debug_level >= DEBUG_LEVEL_ISR)
5722 printk("%s(%d):usc_stop_transmitter(%s)\n",
5723 __FILE__,__LINE__, info->device_name );
5725 del_timer(&info->tx_timer);
5727 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
5728 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5729 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA );
5731 usc_EnableTransmitter(info,DISABLE_UNCONDITIONAL);
5732 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
5733 usc_RTCmd( info, RTCmd_PurgeTxFifo );
5735 info->tx_enabled = false;
5736 info->tx_active = false;
5738 } /* end of usc_stop_transmitter() */
5740 /* usc_load_txfifo()
5742 * Fill the transmit FIFO until the FIFO is full or
5743 * there is no more data to load.
5745 * Arguments: info pointer to device extension (instance data)
5746 * Return Value: None
5748 static void usc_load_txfifo( struct mgsl_struct *info )
5753 if ( !info->xmit_cnt && !info->x_char )
5756 /* Select transmit FIFO status readback in TICR */
5757 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
5759 /* load the Transmit FIFO until FIFOs full or all data sent */
5761 while( (Fifocount = usc_InReg(info, TICR) >> 8) && info->xmit_cnt ) {
5762 /* there is more space in the transmit FIFO and */
5763 /* there is more data in transmit buffer */
5765 if ( (info->xmit_cnt > 1) && (Fifocount > 1) && !info->x_char ) {
5766 /* write a 16-bit word from transmit buffer to 16C32 */
5768 TwoBytes[0] = info->xmit_buf[info->xmit_tail++];
5769 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5770 TwoBytes[1] = info->xmit_buf[info->xmit_tail++];
5771 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5773 outw( *((u16 *)TwoBytes), info->io_base + DATAREG);
5775 info->xmit_cnt -= 2;
5776 info->icount.tx += 2;
5778 /* only 1 byte left to transmit or 1 FIFO slot left */
5780 outw( (inw( info->io_base + CCAR) & 0x0780) | (TDR+LSBONLY),
5781 info->io_base + CCAR );
5784 /* transmit pending high priority char */
5785 outw( info->x_char,info->io_base + CCAR );
5788 outw( info->xmit_buf[info->xmit_tail++],info->io_base + CCAR );
5789 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
5796 } /* end of usc_load_txfifo() */
5800 * Reset the adapter to a known state and prepare it for further use.
5802 * Arguments: info pointer to device instance data
5803 * Return Value: None
5805 static void usc_reset( struct mgsl_struct *info )
5807 if ( info->bus_type == MGSL_BUS_TYPE_PCI ) {
5811 /* Set BIT30 of Misc Control Register */
5812 /* (Local Control Register 0x50) to force reset of USC. */
5814 volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5815 u32 *LCR0BRDR = (u32 *)(info->lcr_base + 0x28);
5817 info->misc_ctrl_value |= BIT30;
5818 *MiscCtrl = info->misc_ctrl_value;
5821 * Force at least 170ns delay before clearing
5822 * reset bit. Each read from LCR takes at least
5823 * 30ns so 10 times for 300ns to be safe.
5826 readval = *MiscCtrl;
5828 info->misc_ctrl_value &= ~BIT30;
5829 *MiscCtrl = info->misc_ctrl_value;
5831 *LCR0BRDR = BUS_DESCRIPTOR(
5832 1, // Write Strobe Hold (0-3)
5833 2, // Write Strobe Delay (0-3)
5834 2, // Read Strobe Delay (0-3)
5835 0, // NWDD (Write data-data) (0-3)
5836 4, // NWAD (Write Addr-data) (0-31)
5837 0, // NXDA (Read/Write Data-Addr) (0-3)
5838 0, // NRDD (Read Data-Data) (0-3)
5839 5 // NRAD (Read Addr-Data) (0-31)
5843 outb( 0,info->io_base + 8 );
5847 info->loopback_bits = 0;
5848 info->usc_idle_mode = 0;
5851 * Program the Bus Configuration Register (BCR)
5853 * <15> 0 Don't use separate address
5854 * <14..6> 0 reserved
5855 * <5..4> 00 IAckmode = Default, don't care
5856 * <3> 1 Bus Request Totem Pole output
5857 * <2> 1 Use 16 Bit data bus
5858 * <1> 0 IRQ Totem Pole output
5859 * <0> 0 Don't Shift Right Addr
5861 * 0000 0000 0000 1100 = 0x000c
5863 * By writing to io_base + SDPIN the Wait/Ack pin is
5864 * programmed to work as a Wait pin.
5867 outw( 0x000c,info->io_base + SDPIN );
5870 outw( 0,info->io_base );
5871 outw( 0,info->io_base + CCAR );
5873 /* select little endian byte ordering */
5874 usc_RTCmd( info, RTCmd_SelectLittleEndian );
5877 /* Port Control Register (PCR)
5879 * <15..14> 11 Port 7 is Output (~DMAEN, Bit 14 : 0 = Enabled)
5880 * <13..12> 11 Port 6 is Output (~INTEN, Bit 12 : 0 = Enabled)
5881 * <11..10> 00 Port 5 is Input (No Connect, Don't Care)
5882 * <9..8> 00 Port 4 is Input (No Connect, Don't Care)
5883 * <7..6> 11 Port 3 is Output (~RTS, Bit 6 : 0 = Enabled )
5884 * <5..4> 11 Port 2 is Output (~DTR, Bit 4 : 0 = Enabled )
5885 * <3..2> 01 Port 1 is Input (Dedicated RxC)
5886 * <1..0> 01 Port 0 is Input (Dedicated TxC)
5888 * 1111 0000 1111 0101 = 0xf0f5
5891 usc_OutReg( info, PCR, 0xf0f5 );
5895 * Input/Output Control Register
5897 * <15..14> 00 CTS is active low input
5898 * <13..12> 00 DCD is active low input
5899 * <11..10> 00 TxREQ pin is input (DSR)
5900 * <9..8> 00 RxREQ pin is input (RI)
5901 * <7..6> 00 TxD is output (Transmit Data)
5902 * <5..3> 000 TxC Pin in Input (14.7456MHz Clock)
5903 * <2..0> 100 RxC is Output (drive with BRG0)
5905 * 0000 0000 0000 0100 = 0x0004
5908 usc_OutReg( info, IOCR, 0x0004 );
5910 } /* end of usc_reset() */
5912 /* usc_set_async_mode()
5914 * Program adapter for asynchronous communications.
5916 * Arguments: info pointer to device instance data
5917 * Return Value: None
5919 static void usc_set_async_mode( struct mgsl_struct *info )
5923 /* disable interrupts while programming USC */
5924 usc_DisableMasterIrqBit( info );
5926 outw( 0, info->io_base ); /* clear Master Bus Enable (DCAR) */
5927 usc_DmaCmd( info, DmaCmd_ResetAllChannels ); /* disable both DMA channels */
5929 usc_loopback_frame( info );
5931 /* Channel mode Register (CMR)
5933 * <15..14> 00 Tx Sub modes, 00 = 1 Stop Bit
5934 * <13..12> 00 00 = 16X Clock
5935 * <11..8> 0000 Transmitter mode = Asynchronous
5936 * <7..6> 00 reserved?
5937 * <5..4> 00 Rx Sub modes, 00 = 16X Clock
5938 * <3..0> 0000 Receiver mode = Asynchronous
5940 * 0000 0000 0000 0000 = 0x0
5944 if ( info->params.stop_bits != 1 )
5946 usc_OutReg( info, CMR, RegValue );
5949 /* Receiver mode Register (RMR)
5951 * <15..13> 000 encoding = None
5952 * <12..08> 00000 reserved (Sync Only)
5953 * <7..6> 00 Even parity
5954 * <5> 0 parity disabled
5955 * <4..2> 000 Receive Char Length = 8 bits
5956 * <1..0> 00 Disable Receiver
5958 * 0000 0000 0000 0000 = 0x0
5963 if ( info->params.data_bits != 8 )
5964 RegValue |= BIT4+BIT3+BIT2;
5966 if ( info->params.parity != ASYNC_PARITY_NONE ) {
5968 if ( info->params.parity != ASYNC_PARITY_ODD )
5972 usc_OutReg( info, RMR, RegValue );
5975 /* Set IRQ trigger level */
5977 usc_RCmd( info, RCmd_SelectRicrIntLevel );
5980 /* Receive Interrupt Control Register (RICR)
5982 * <15..8> ? RxFIFO IRQ Request Level
5984 * Note: For async mode the receive FIFO level must be set
5985 * to 0 to avoid the situation where the FIFO contains fewer bytes
5986 * than the trigger level and no more data is expected.
5988 * <7> 0 Exited Hunt IA (Interrupt Arm)
5989 * <6> 0 Idle Received IA
5990 * <5> 0 Break/Abort IA
5992 * <3> 0 Queued status reflects oldest byte in FIFO
5994 * <1> 0 Rx Overrun IA
5995 * <0> 0 Select TC0 value for readback
5997 * 0000 0000 0100 0000 = 0x0000 + (FIFOLEVEL in MSB)
6000 usc_OutReg( info, RICR, 0x0000 );
6002 usc_UnlatchRxstatusBits( info, RXSTATUS_ALL );
6003 usc_ClearIrqPendingBits( info, RECEIVE_STATUS );
6006 /* Transmit mode Register (TMR)
6008 * <15..13> 000 encoding = None
6009 * <12..08> 00000 reserved (Sync Only)
6010 * <7..6> 00 Transmit parity Even
6011 * <5> 0 Transmit parity Disabled
6012 * <4..2> 000 Tx Char Length = 8 bits
6013 * <1..0> 00 Disable Transmitter
6015 * 0000 0000 0000 0000 = 0x0
6020 if ( info->params.data_bits != 8 )
6021 RegValue |= BIT4+BIT3+BIT2;
6023 if ( info->params.parity != ASYNC_PARITY_NONE ) {
6025 if ( info->params.parity != ASYNC_PARITY_ODD )
6029 usc_OutReg( info, TMR, RegValue );
6031 usc_set_txidle( info );
6034 /* Set IRQ trigger level */
6036 usc_TCmd( info, TCmd_SelectTicrIntLevel );
6039 /* Transmit Interrupt Control Register (TICR)
6041 * <15..8> ? Transmit FIFO IRQ Level
6042 * <7> 0 Present IA (Interrupt Arm)
6043 * <6> 1 Idle Sent IA
6044 * <5> 0 Abort Sent IA
6045 * <4> 0 EOF/EOM Sent IA
6047 * <2> 0 1 = Wait for SW Trigger to Start Frame
6048 * <1> 0 Tx Underrun IA
6049 * <0> 0 TC0 constant on read back
6051 * 0000 0000 0100 0000 = 0x0040
6054 usc_OutReg( info, TICR, 0x1f40 );
6056 usc_UnlatchTxstatusBits( info, TXSTATUS_ALL );
6057 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS );
6059 usc_enable_async_clock( info, info->params.data_rate );
6062 /* Channel Control/status Register (CCSR)
6064 * <15> X RCC FIFO Overflow status (RO)
6065 * <14> X RCC FIFO Not Empty status (RO)
6066 * <13> 0 1 = Clear RCC FIFO (WO)
6067 * <12> X DPLL in Sync status (RO)
6068 * <11> X DPLL 2 Missed Clocks status (RO)
6069 * <10> X DPLL 1 Missed Clock status (RO)
6070 * <9..8> 00 DPLL Resync on rising and falling edges (RW)
6071 * <7> X SDLC Loop On status (RO)
6072 * <6> X SDLC Loop Send status (RO)
6073 * <5> 1 Bypass counters for TxClk and RxClk (RW)
6074 * <4..2> 000 Last Char of SDLC frame has 8 bits (RW)
6075 * <1..0> 00 reserved
6077 * 0000 0000 0010 0000 = 0x0020
6080 usc_OutReg( info, CCSR, 0x0020 );
6082 usc_DisableInterrupts( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6083 RECEIVE_DATA + RECEIVE_STATUS );
6085 usc_ClearIrqPendingBits( info, TRANSMIT_STATUS + TRANSMIT_DATA +
6086 RECEIVE_DATA + RECEIVE_STATUS );
6088 usc_EnableMasterIrqBit( info );
6090 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6091 /* Enable INTEN (Port 6, Bit12) */
6092 /* This connects the IRQ request signal to the ISA bus */
6093 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6096 if (info->params.loopback) {
6097 info->loopback_bits = 0x300;
6098 outw(0x0300, info->io_base + CCAR);
6101 } /* end of usc_set_async_mode() */
6103 /* usc_loopback_frame()
6105 * Loop back a small (2 byte) dummy SDLC frame.
6106 * Interrupts and DMA are NOT used. The purpose of this is to
6107 * clear any 'stale' status info left over from running in async mode.
6109 * The 16C32 shows the strange behaviour of marking the 1st
6110 * received SDLC frame with a CRC error even when there is no
6111 * CRC error. To get around this a small dummy from of 2 bytes
6112 * is looped back when switching from async to sync mode.
6114 * Arguments: info pointer to device instance data
6115 * Return Value: None
6117 static void usc_loopback_frame( struct mgsl_struct *info )
6120 unsigned long oldmode = info->params.mode;
6122 info->params.mode = MGSL_MODE_HDLC;
6124 usc_DisableMasterIrqBit( info );
6126 usc_set_sdlc_mode( info );
6127 usc_enable_loopback( info, 1 );
6129 /* Write 16-bit Time Constant for BRG0 */
6130 usc_OutReg( info, TC0R, 0 );
6132 /* Channel Control Register (CCR)
6134 * <15..14> 00 Don't use 32-bit Tx Control Blocks (TCBs)
6135 * <13> 0 Trigger Tx on SW Command Disabled
6136 * <12> 0 Flag Preamble Disabled
6137 * <11..10> 00 Preamble Length = 8-Bits
6138 * <9..8> 01 Preamble Pattern = flags
6139 * <7..6> 10 Don't use 32-bit Rx status Blocks (RSBs)
6140 * <5> 0 Trigger Rx on SW Command Disabled
6143 * 0000 0001 0000 0000 = 0x0100
6146 usc_OutReg( info, CCR, 0x0100 );
6148 /* SETUP RECEIVER */
6149 usc_RTCmd( info, RTCmd_PurgeRxFifo );
6150 usc_EnableReceiver(info,ENABLE_UNCONDITIONAL);
6152 /* SETUP TRANSMITTER */
6153 /* Program the Transmit Character Length Register (TCLR) */
6154 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
6155 usc_OutReg( info, TCLR, 2 );
6156 usc_RTCmd( info, RTCmd_PurgeTxFifo );
6158 /* unlatch Tx status bits, and start transmit channel. */
6159 usc_UnlatchTxstatusBits(info,TXSTATUS_ALL);
6160 outw(0,info->io_base + DATAREG);
6162 /* ENABLE TRANSMITTER */
6163 usc_TCmd( info, TCmd_SendFrame );
6164 usc_EnableTransmitter(info,ENABLE_UNCONDITIONAL);
6166 /* WAIT FOR RECEIVE COMPLETE */
6167 for (i=0 ; i<1000 ; i++)
6168 if (usc_InReg( info, RCSR ) & (BIT8 + BIT4 + BIT3 + BIT1))
6171 /* clear Internal Data loopback mode */
6172 usc_enable_loopback(info, 0);
6174 usc_EnableMasterIrqBit(info);
6176 info->params.mode = oldmode;
6178 } /* end of usc_loopback_frame() */
6180 /* usc_set_sync_mode() Programs the USC for SDLC communications.
6182 * Arguments: info pointer to adapter info structure
6183 * Return Value: None
6185 static void usc_set_sync_mode( struct mgsl_struct *info )
6187 usc_loopback_frame( info );
6188 usc_set_sdlc_mode( info );
6190 if (info->bus_type == MGSL_BUS_TYPE_ISA) {
6191 /* Enable INTEN (Port 6, Bit12) */
6192 /* This connects the IRQ request signal to the ISA bus */
6193 usc_OutReg(info, PCR, (u16)((usc_InReg(info, PCR) | BIT13) & ~BIT12));
6196 usc_enable_aux_clock(info, info->params.clock_speed);
6198 if (info->params.loopback)
6199 usc_enable_loopback(info,1);
6201 } /* end of mgsl_set_sync_mode() */
6203 /* usc_set_txidle() Set the HDLC idle mode for the transmitter.
6205 * Arguments: info pointer to device instance data
6206 * Return Value: None
6208 static void usc_set_txidle( struct mgsl_struct *info )
6210 u16 usc_idle_mode = IDLEMODE_FLAGS;
6212 /* Map API idle mode to USC register bits */
6214 switch( info->idle_mode ){
6215 case HDLC_TXIDLE_FLAGS: usc_idle_mode = IDLEMODE_FLAGS; break;
6216 case HDLC_TXIDLE_ALT_ZEROS_ONES: usc_idle_mode = IDLEMODE_ALT_ONE_ZERO; break;
6217 case HDLC_TXIDLE_ZEROS: usc_idle_mode = IDLEMODE_ZERO; break;
6218 case HDLC_TXIDLE_ONES: usc_idle_mode = IDLEMODE_ONE; break;
6219 case HDLC_TXIDLE_ALT_MARK_SPACE: usc_idle_mode = IDLEMODE_ALT_MARK_SPACE; break;
6220 case HDLC_TXIDLE_SPACE: usc_idle_mode = IDLEMODE_SPACE; break;
6221 case HDLC_TXIDLE_MARK: usc_idle_mode = IDLEMODE_MARK; break;
6224 info->usc_idle_mode = usc_idle_mode;
6225 //usc_OutReg(info, TCSR, usc_idle_mode);
6226 info->tcsr_value &= ~IDLEMODE_MASK; /* clear idle mode bits */
6227 info->tcsr_value += usc_idle_mode;
6228 usc_OutReg(info, TCSR, info->tcsr_value);
6231 * if SyncLink WAN adapter is running in external sync mode, the
6232 * transmitter has been set to Monosync in order to try to mimic
6233 * a true raw outbound bit stream. Monosync still sends an open/close
6234 * sync char at the start/end of a frame. Try to match those sync
6235 * patterns to the idle mode set here
6237 if ( info->params.mode == MGSL_MODE_RAW ) {
6238 unsigned char syncpat = 0;
6239 switch( info->idle_mode ) {
6240 case HDLC_TXIDLE_FLAGS:
6243 case HDLC_TXIDLE_ALT_ZEROS_ONES:
6246 case HDLC_TXIDLE_ZEROS:
6247 case HDLC_TXIDLE_SPACE:
6250 case HDLC_TXIDLE_ONES:
6251 case HDLC_TXIDLE_MARK:
6254 case HDLC_TXIDLE_ALT_MARK_SPACE:
6259 usc_SetTransmitSyncChars(info,syncpat,syncpat);
6262 } /* end of usc_set_txidle() */
6264 /* usc_get_serial_signals()
6266 * Query the adapter for the state of the V24 status (input) signals.
6268 * Arguments: info pointer to device instance data
6269 * Return Value: None
6271 static void usc_get_serial_signals( struct mgsl_struct *info )
6275 /* clear all serial signals except DTR and RTS */
6276 info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
6278 /* Read the Misc Interrupt status Register (MISR) to get */
6279 /* the V24 status signals. */
6281 status = usc_InReg( info, MISR );
6283 /* set serial signal bits to reflect MISR */
6285 if ( status & MISCSTATUS_CTS )
6286 info->serial_signals |= SerialSignal_CTS;
6288 if ( status & MISCSTATUS_DCD )
6289 info->serial_signals |= SerialSignal_DCD;
6291 if ( status & MISCSTATUS_RI )
6292 info->serial_signals |= SerialSignal_RI;
6294 if ( status & MISCSTATUS_DSR )
6295 info->serial_signals |= SerialSignal_DSR;
6297 } /* end of usc_get_serial_signals() */
6299 /* usc_set_serial_signals()
6301 * Set the state of DTR and RTS based on contents of
6302 * serial_signals member of device extension.
6304 * Arguments: info pointer to device instance data
6305 * Return Value: None
6307 static void usc_set_serial_signals( struct mgsl_struct *info )
6310 unsigned char V24Out = info->serial_signals;
6312 /* get the current value of the Port Control Register (PCR) */
6314 Control = usc_InReg( info, PCR );
6316 if ( V24Out & SerialSignal_RTS )
6321 if ( V24Out & SerialSignal_DTR )
6326 usc_OutReg( info, PCR, Control );
6328 } /* end of usc_set_serial_signals() */
6330 /* usc_enable_async_clock()
6332 * Enable the async clock at the specified frequency.
6334 * Arguments: info pointer to device instance data
6335 * data_rate data rate of clock in bps
6336 * 0 disables the AUX clock.
6337 * Return Value: None
6339 static void usc_enable_async_clock( struct mgsl_struct *info, u32 data_rate )
6343 * Clock mode Control Register (CMCR)
6345 * <15..14> 00 counter 1 Disabled
6346 * <13..12> 00 counter 0 Disabled
6347 * <11..10> 11 BRG1 Input is TxC Pin
6348 * <9..8> 11 BRG0 Input is TxC Pin
6349 * <7..6> 01 DPLL Input is BRG1 Output
6350 * <5..3> 100 TxCLK comes from BRG0
6351 * <2..0> 100 RxCLK comes from BRG0
6353 * 0000 1111 0110 0100 = 0x0f64
6356 usc_OutReg( info, CMCR, 0x0f64 );
6360 * Write 16-bit Time Constant for BRG0
6361 * Time Constant = (ClkSpeed / data_rate) - 1
6362 * ClkSpeed = 921600 (ISA), 691200 (PCI)
6365 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6366 usc_OutReg( info, TC0R, (u16)((691200/data_rate) - 1) );
6368 usc_OutReg( info, TC0R, (u16)((921600/data_rate) - 1) );
6372 * Hardware Configuration Register (HCR)
6373 * Clear Bit 1, BRG0 mode = Continuous
6374 * Set Bit 0 to enable BRG0.
6377 usc_OutReg( info, HCR,
6378 (u16)((usc_InReg( info, HCR ) & ~BIT1) | BIT0) );
6381 /* Input/Output Control Reg, <2..0> = 100, Drive RxC pin with BRG0 */
6383 usc_OutReg( info, IOCR,
6384 (u16)((usc_InReg(info, IOCR) & 0xfff8) | 0x0004) );
6386 /* data rate == 0 so turn off BRG0 */
6387 usc_OutReg( info, HCR, (u16)(usc_InReg( info, HCR ) & ~BIT0) );
6390 } /* end of usc_enable_async_clock() */
6393 * Buffer Structures:
6395 * Normal memory access uses virtual addresses that can make discontiguous
6396 * physical memory pages appear to be contiguous in the virtual address
6397 * space (the processors memory mapping handles the conversions).
6399 * DMA transfers require physically contiguous memory. This is because
6400 * the DMA system controller and DMA bus masters deal with memory using
6401 * only physical addresses.
6403 * This causes a problem under Windows NT when large DMA buffers are
6404 * needed. Fragmentation of the nonpaged pool prevents allocations of
6405 * physically contiguous buffers larger than the PAGE_SIZE.
6407 * However the 16C32 supports Bus Master Scatter/Gather DMA which
6408 * allows DMA transfers to physically discontiguous buffers. Information
6409 * about each data transfer buffer is contained in a memory structure
6410 * called a 'buffer entry'. A list of buffer entries is maintained
6411 * to track and control the use of the data transfer buffers.
6413 * To support this strategy we will allocate sufficient PAGE_SIZE
6414 * contiguous memory buffers to allow for the total required buffer
6417 * The 16C32 accesses the list of buffer entries using Bus Master
6418 * DMA. Control information is read from the buffer entries by the
6419 * 16C32 to control data transfers. status information is written to
6420 * the buffer entries by the 16C32 to indicate the status of completed
6423 * The CPU writes control information to the buffer entries to control
6424 * the 16C32 and reads status information from the buffer entries to
6425 * determine information about received and transmitted frames.
6427 * Because the CPU and 16C32 (adapter) both need simultaneous access
6428 * to the buffer entries, the buffer entry memory is allocated with
6429 * HalAllocateCommonBuffer(). This restricts the size of the buffer
6430 * entry list to PAGE_SIZE.
6432 * The actual data buffers on the other hand will only be accessed
6433 * by the CPU or the adapter but not by both simultaneously. This allows
6434 * Scatter/Gather packet based DMA procedures for using physically
6435 * discontiguous pages.
6439 * mgsl_reset_tx_dma_buffers()
6441 * Set the count for all transmit buffers to 0 to indicate the
6442 * buffer is available for use and set the current buffer to the
6443 * first buffer. This effectively makes all buffers free and
6444 * discards any data in buffers.
6446 * Arguments: info pointer to device instance data
6447 * Return Value: None
6449 static void mgsl_reset_tx_dma_buffers( struct mgsl_struct *info )
6453 for ( i = 0; i < info->tx_buffer_count; i++ ) {
6454 *((unsigned long *)&(info->tx_buffer_list[i].count)) = 0;
6457 info->current_tx_buffer = 0;
6458 info->start_tx_dma_buffer = 0;
6459 info->tx_dma_buffers_used = 0;
6461 info->get_tx_holding_index = 0;
6462 info->put_tx_holding_index = 0;
6463 info->tx_holding_count = 0;
6465 } /* end of mgsl_reset_tx_dma_buffers() */
6468 * num_free_tx_dma_buffers()
6470 * returns the number of free tx dma buffers available
6472 * Arguments: info pointer to device instance data
6473 * Return Value: number of free tx dma buffers
6475 static int num_free_tx_dma_buffers(struct mgsl_struct *info)
6477 return info->tx_buffer_count - info->tx_dma_buffers_used;
6481 * mgsl_reset_rx_dma_buffers()
6483 * Set the count for all receive buffers to DMABUFFERSIZE
6484 * and set the current buffer to the first buffer. This effectively
6485 * makes all buffers free and discards any data in buffers.
6487 * Arguments: info pointer to device instance data
6488 * Return Value: None
6490 static void mgsl_reset_rx_dma_buffers( struct mgsl_struct *info )
6494 for ( i = 0; i < info->rx_buffer_count; i++ ) {
6495 *((unsigned long *)&(info->rx_buffer_list[i].count)) = DMABUFFERSIZE;
6496 // info->rx_buffer_list[i].count = DMABUFFERSIZE;
6497 // info->rx_buffer_list[i].status = 0;
6500 info->current_rx_buffer = 0;
6502 } /* end of mgsl_reset_rx_dma_buffers() */
6505 * mgsl_free_rx_frame_buffers()
6507 * Free the receive buffers used by a received SDLC
6508 * frame such that the buffers can be reused.
6512 * info pointer to device instance data
6513 * StartIndex index of 1st receive buffer of frame
6514 * EndIndex index of last receive buffer of frame
6516 * Return Value: None
6518 static void mgsl_free_rx_frame_buffers( struct mgsl_struct *info, unsigned int StartIndex, unsigned int EndIndex )
6521 DMABUFFERENTRY *pBufEntry;
6524 /* Starting with 1st buffer entry of the frame clear the status */
6525 /* field and set the count field to DMA Buffer Size. */
6530 pBufEntry = &(info->rx_buffer_list[Index]);
6532 if ( Index == EndIndex ) {
6533 /* This is the last buffer of the frame! */
6537 /* reset current buffer for reuse */
6538 // pBufEntry->status = 0;
6539 // pBufEntry->count = DMABUFFERSIZE;
6540 *((unsigned long *)&(pBufEntry->count)) = DMABUFFERSIZE;
6542 /* advance to next buffer entry in linked list */
6544 if ( Index == info->rx_buffer_count )
6548 /* set current buffer to next buffer after last buffer of frame */
6549 info->current_rx_buffer = Index;
6551 } /* end of free_rx_frame_buffers() */
6553 /* mgsl_get_rx_frame()
6555 * This function attempts to return a received SDLC frame from the
6556 * receive DMA buffers. Only frames received without errors are returned.
6558 * Arguments: info pointer to device extension
6559 * Return Value: true if frame returned, otherwise false
6561 static bool mgsl_get_rx_frame(struct mgsl_struct *info)
6563 unsigned int StartIndex, EndIndex; /* index of 1st and last buffers of Rx frame */
6564 unsigned short status;
6565 DMABUFFERENTRY *pBufEntry;
6566 unsigned int framesize = 0;
6567 bool ReturnCode = false;
6568 unsigned long flags;
6569 struct tty_struct *tty = info->tty;
6570 bool return_frame = false;
6573 * current_rx_buffer points to the 1st buffer of the next available
6574 * receive frame. To find the last buffer of the frame look for
6575 * a non-zero status field in the buffer entries. (The status
6576 * field is set by the 16C32 after completing a receive frame.
6579 StartIndex = EndIndex = info->current_rx_buffer;
6581 while( !info->rx_buffer_list[EndIndex].status ) {
6583 * If the count field of the buffer entry is non-zero then
6584 * this buffer has not been used. (The 16C32 clears the count
6585 * field when it starts using the buffer.) If an unused buffer
6586 * is encountered then there are no frames available.
6589 if ( info->rx_buffer_list[EndIndex].count )
6592 /* advance to next buffer entry in linked list */
6594 if ( EndIndex == info->rx_buffer_count )
6597 /* if entire list searched then no frame available */
6598 if ( EndIndex == StartIndex ) {
6599 /* If this occurs then something bad happened,
6600 * all buffers have been 'used' but none mark
6601 * the end of a frame. Reset buffers and receiver.
6604 if ( info->rx_enabled ){
6605 spin_lock_irqsave(&info->irq_spinlock,flags);
6606 usc_start_receiver(info);
6607 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6614 /* check status of receive frame */
6616 status = info->rx_buffer_list[EndIndex].status;
6618 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6619 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6620 if ( status & RXSTATUS_SHORT_FRAME )
6621 info->icount.rxshort++;
6622 else if ( status & RXSTATUS_ABORT )
6623 info->icount.rxabort++;
6624 else if ( status & RXSTATUS_OVERRUN )
6625 info->icount.rxover++;
6627 info->icount.rxcrc++;
6628 if ( info->params.crc_type & HDLC_CRC_RETURN_EX )
6629 return_frame = true;
6632 #if SYNCLINK_GENERIC_HDLC
6634 struct net_device_stats *stats = hdlc_stats(info->netdev);
6636 stats->rx_frame_errors++;
6640 return_frame = true;
6642 if ( return_frame ) {
6643 /* receive frame has no errors, get frame size.
6644 * The frame size is the starting value of the RCC (which was
6645 * set to 0xffff) minus the ending value of the RCC (decremented
6646 * once for each receive character) minus 2 for the 16-bit CRC.
6649 framesize = RCLRVALUE - info->rx_buffer_list[EndIndex].rcc;
6651 /* adjust frame size for CRC if any */
6652 if ( info->params.crc_type == HDLC_CRC_16_CCITT )
6654 else if ( info->params.crc_type == HDLC_CRC_32_CCITT )
6658 if ( debug_level >= DEBUG_LEVEL_BH )
6659 printk("%s(%d):mgsl_get_rx_frame(%s) status=%04X size=%d\n",
6660 __FILE__,__LINE__,info->device_name,status,framesize);
6662 if ( debug_level >= DEBUG_LEVEL_DATA )
6663 mgsl_trace_block(info,info->rx_buffer_list[StartIndex].virt_addr,
6664 min_t(int, framesize, DMABUFFERSIZE),0);
6667 if ( ( (info->params.crc_type & HDLC_CRC_RETURN_EX) &&
6668 ((framesize+1) > info->max_frame_size) ) ||
6669 (framesize > info->max_frame_size) )
6670 info->icount.rxlong++;
6672 /* copy dma buffer(s) to contiguous intermediate buffer */
6673 int copy_count = framesize;
6674 int index = StartIndex;
6675 unsigned char *ptmp = info->intermediate_rxbuffer;
6677 if ( !(status & RXSTATUS_CRC_ERROR))
6678 info->icount.rxok++;
6682 if ( copy_count > DMABUFFERSIZE )
6683 partial_count = DMABUFFERSIZE;
6685 partial_count = copy_count;
6687 pBufEntry = &(info->rx_buffer_list[index]);
6688 memcpy( ptmp, pBufEntry->virt_addr, partial_count );
6689 ptmp += partial_count;
6690 copy_count -= partial_count;
6692 if ( ++index == info->rx_buffer_count )
6696 if ( info->params.crc_type & HDLC_CRC_RETURN_EX ) {
6698 *ptmp = (status & RXSTATUS_CRC_ERROR ?
6702 if ( debug_level >= DEBUG_LEVEL_DATA )
6703 printk("%s(%d):mgsl_get_rx_frame(%s) rx frame status=%d\n",
6704 __FILE__,__LINE__,info->device_name,
6708 #if SYNCLINK_GENERIC_HDLC
6710 hdlcdev_rx(info,info->intermediate_rxbuffer,framesize);
6713 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6716 /* Free the buffers used by this frame. */
6717 mgsl_free_rx_frame_buffers( info, StartIndex, EndIndex );
6723 if ( info->rx_enabled && info->rx_overflow ) {
6724 /* The receiver needs to restarted because of
6725 * a receive overflow (buffer or FIFO). If the
6726 * receive buffers are now empty, then restart receiver.
6729 if ( !info->rx_buffer_list[EndIndex].status &&
6730 info->rx_buffer_list[EndIndex].count ) {
6731 spin_lock_irqsave(&info->irq_spinlock,flags);
6732 usc_start_receiver(info);
6733 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6739 } /* end of mgsl_get_rx_frame() */
6741 /* mgsl_get_raw_rx_frame()
6743 * This function attempts to return a received frame from the
6744 * receive DMA buffers when running in external loop mode. In this mode,
6745 * we will return at most one DMABUFFERSIZE frame to the application.
6746 * The USC receiver is triggering off of DCD going active to start a new
6747 * frame, and DCD going inactive to terminate the frame (similar to
6748 * processing a closing flag character).
6750 * In this routine, we will return DMABUFFERSIZE "chunks" at a time.
6751 * If DCD goes inactive, the last Rx DMA Buffer will have a non-zero
6752 * status field and the RCC field will indicate the length of the
6753 * entire received frame. We take this RCC field and get the modulus
6754 * of RCC and DMABUFFERSIZE to determine if number of bytes in the
6755 * last Rx DMA buffer and return that last portion of the frame.
6757 * Arguments: info pointer to device extension
6758 * Return Value: true if frame returned, otherwise false
6760 static bool mgsl_get_raw_rx_frame(struct mgsl_struct *info)
6762 unsigned int CurrentIndex, NextIndex;
6763 unsigned short status;
6764 DMABUFFERENTRY *pBufEntry;
6765 unsigned int framesize = 0;
6766 bool ReturnCode = false;
6767 unsigned long flags;
6768 struct tty_struct *tty = info->tty;
6771 * current_rx_buffer points to the 1st buffer of the next available
6772 * receive frame. The status field is set by the 16C32 after
6773 * completing a receive frame. If the status field of this buffer
6774 * is zero, either the USC is still filling this buffer or this
6775 * is one of a series of buffers making up a received frame.
6777 * If the count field of this buffer is zero, the USC is either
6778 * using this buffer or has used this buffer. Look at the count
6779 * field of the next buffer. If that next buffer's count is
6780 * non-zero, the USC is still actively using the current buffer.
6781 * Otherwise, if the next buffer's count field is zero, the
6782 * current buffer is complete and the USC is using the next
6785 CurrentIndex = NextIndex = info->current_rx_buffer;
6787 if ( NextIndex == info->rx_buffer_count )
6790 if ( info->rx_buffer_list[CurrentIndex].status != 0 ||
6791 (info->rx_buffer_list[CurrentIndex].count == 0 &&
6792 info->rx_buffer_list[NextIndex].count == 0)) {
6794 * Either the status field of this dma buffer is non-zero
6795 * (indicating the last buffer of a receive frame) or the next
6796 * buffer is marked as in use -- implying this buffer is complete
6797 * and an intermediate buffer for this received frame.
6800 status = info->rx_buffer_list[CurrentIndex].status;
6802 if ( status & (RXSTATUS_SHORT_FRAME + RXSTATUS_OVERRUN +
6803 RXSTATUS_CRC_ERROR + RXSTATUS_ABORT) ) {
6804 if ( status & RXSTATUS_SHORT_FRAME )
6805 info->icount.rxshort++;
6806 else if ( status & RXSTATUS_ABORT )
6807 info->icount.rxabort++;
6808 else if ( status & RXSTATUS_OVERRUN )
6809 info->icount.rxover++;
6811 info->icount.rxcrc++;
6815 * A receive frame is available, get frame size and status.
6817 * The frame size is the starting value of the RCC (which was
6818 * set to 0xffff) minus the ending value of the RCC (decremented
6819 * once for each receive character) minus 2 or 4 for the 16-bit
6822 * If the status field is zero, this is an intermediate buffer.
6825 * If the DMA Buffer Entry's Status field is non-zero, the
6826 * receive operation completed normally (ie: DCD dropped). The
6827 * RCC field is valid and holds the received frame size.
6828 * It is possible that the RCC field will be zero on a DMA buffer
6829 * entry with a non-zero status. This can occur if the total
6830 * frame size (number of bytes between the time DCD goes active
6831 * to the time DCD goes inactive) exceeds 65535 bytes. In this
6832 * case the 16C32 has underrun on the RCC count and appears to
6833 * stop updating this counter to let us know the actual received
6834 * frame size. If this happens (non-zero status and zero RCC),
6835 * simply return the entire RxDMA Buffer
6839 * In the event that the final RxDMA Buffer is
6840 * terminated with a non-zero status and the RCC
6841 * field is zero, we interpret this as the RCC
6842 * having underflowed (received frame > 65535 bytes).
6844 * Signal the event to the user by passing back
6845 * a status of RxStatus_CrcError returning the full
6846 * buffer and let the app figure out what data is
6849 if ( info->rx_buffer_list[CurrentIndex].rcc )
6850 framesize = RCLRVALUE - info->rx_buffer_list[CurrentIndex].rcc;
6852 framesize = DMABUFFERSIZE;
6855 framesize = DMABUFFERSIZE;
6858 if ( framesize > DMABUFFERSIZE ) {
6860 * if running in raw sync mode, ISR handler for
6861 * End Of Buffer events terminates all buffers at 4K.
6862 * If this frame size is said to be >4K, get the
6863 * actual number of bytes of the frame in this buffer.
6865 framesize = framesize % DMABUFFERSIZE;
6869 if ( debug_level >= DEBUG_LEVEL_BH )
6870 printk("%s(%d):mgsl_get_raw_rx_frame(%s) status=%04X size=%d\n",
6871 __FILE__,__LINE__,info->device_name,status,framesize);
6873 if ( debug_level >= DEBUG_LEVEL_DATA )
6874 mgsl_trace_block(info,info->rx_buffer_list[CurrentIndex].virt_addr,
6875 min_t(int, framesize, DMABUFFERSIZE),0);
6878 /* copy dma buffer(s) to contiguous intermediate buffer */
6879 /* NOTE: we never copy more than DMABUFFERSIZE bytes */
6881 pBufEntry = &(info->rx_buffer_list[CurrentIndex]);
6882 memcpy( info->intermediate_rxbuffer, pBufEntry->virt_addr, framesize);
6883 info->icount.rxok++;
6885 ldisc_receive_buf(tty, info->intermediate_rxbuffer, info->flag_buf, framesize);
6888 /* Free the buffers used by this frame. */
6889 mgsl_free_rx_frame_buffers( info, CurrentIndex, CurrentIndex );
6895 if ( info->rx_enabled && info->rx_overflow ) {
6896 /* The receiver needs to restarted because of
6897 * a receive overflow (buffer or FIFO). If the
6898 * receive buffers are now empty, then restart receiver.
6901 if ( !info->rx_buffer_list[CurrentIndex].status &&
6902 info->rx_buffer_list[CurrentIndex].count ) {
6903 spin_lock_irqsave(&info->irq_spinlock,flags);
6904 usc_start_receiver(info);
6905 spin_unlock_irqrestore(&info->irq_spinlock,flags);
6911 } /* end of mgsl_get_raw_rx_frame() */
6913 /* mgsl_load_tx_dma_buffer()
6915 * Load the transmit DMA buffer with the specified data.
6919 * info pointer to device extension
6920 * Buffer pointer to buffer containing frame to load
6921 * BufferSize size in bytes of frame in Buffer
6923 * Return Value: None
6925 static void mgsl_load_tx_dma_buffer(struct mgsl_struct *info,
6926 const char *Buffer, unsigned int BufferSize)
6928 unsigned short Copycount;
6930 DMABUFFERENTRY *pBufEntry;
6932 if ( debug_level >= DEBUG_LEVEL_DATA )
6933 mgsl_trace_block(info,Buffer, min_t(int, BufferSize, DMABUFFERSIZE), 1);
6935 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
6936 /* set CMR:13 to start transmit when
6937 * next GoAhead (abort) is received
6939 info->cmr_value |= BIT13;
6942 /* begin loading the frame in the next available tx dma
6943 * buffer, remember it's starting location for setting
6944 * up tx dma operation
6946 i = info->current_tx_buffer;
6947 info->start_tx_dma_buffer = i;
6949 /* Setup the status and RCC (Frame Size) fields of the 1st */
6950 /* buffer entry in the transmit DMA buffer list. */
6952 info->tx_buffer_list[i].status = info->cmr_value & 0xf000;
6953 info->tx_buffer_list[i].rcc = BufferSize;
6954 info->tx_buffer_list[i].count = BufferSize;
6956 /* Copy frame data from 1st source buffer to the DMA buffers. */
6957 /* The frame data may span multiple DMA buffers. */
6959 while( BufferSize ){
6960 /* Get a pointer to next DMA buffer entry. */
6961 pBufEntry = &info->tx_buffer_list[i++];
6963 if ( i == info->tx_buffer_count )
6966 /* Calculate the number of bytes that can be copied from */
6967 /* the source buffer to this DMA buffer. */
6968 if ( BufferSize > DMABUFFERSIZE )
6969 Copycount = DMABUFFERSIZE;
6971 Copycount = BufferSize;
6973 /* Actually copy data from source buffer to DMA buffer. */
6974 /* Also set the data count for this individual DMA buffer. */
6975 if ( info->bus_type == MGSL_BUS_TYPE_PCI )
6976 mgsl_load_pci_memory(pBufEntry->virt_addr, Buffer,Copycount);
6978 memcpy(pBufEntry->virt_addr, Buffer, Copycount);
6980 pBufEntry->count = Copycount;
6982 /* Advance source pointer and reduce remaining data count. */
6983 Buffer += Copycount;
6984 BufferSize -= Copycount;
6986 ++info->tx_dma_buffers_used;
6989 /* remember next available tx dma buffer */
6990 info->current_tx_buffer = i;
6992 } /* end of mgsl_load_tx_dma_buffer() */
6995 * mgsl_register_test()
6997 * Performs a register test of the 16C32.
6999 * Arguments: info pointer to device instance data
7000 * Return Value: true if test passed, otherwise false
7002 static bool mgsl_register_test( struct mgsl_struct *info )
7004 static unsigned short BitPatterns[] =
7005 { 0x0000, 0xffff, 0xaaaa, 0x5555, 0x1234, 0x6969, 0x9696, 0x0f0f };
7006 static unsigned int Patterncount = ARRAY_SIZE(BitPatterns);
7009 unsigned long flags;
7011 spin_lock_irqsave(&info->irq_spinlock,flags);
7014 /* Verify the reset state of some registers. */
7016 if ( (usc_InReg( info, SICR ) != 0) ||
7017 (usc_InReg( info, IVR ) != 0) ||
7018 (usc_InDmaReg( info, DIVR ) != 0) ){
7023 /* Write bit patterns to various registers but do it out of */
7024 /* sync, then read back and verify values. */
7026 for ( i = 0 ; i < Patterncount ; i++ ) {
7027 usc_OutReg( info, TC0R, BitPatterns[i] );
7028 usc_OutReg( info, TC1R, BitPatterns[(i+1)%Patterncount] );
7029 usc_OutReg( info, TCLR, BitPatterns[(i+2)%Patterncount] );
7030 usc_OutReg( info, RCLR, BitPatterns[(i+3)%Patterncount] );
7031 usc_OutReg( info, RSR, BitPatterns[(i+4)%Patterncount] );
7032 usc_OutDmaReg( info, TBCR, BitPatterns[(i+5)%Patterncount] );
7034 if ( (usc_InReg( info, TC0R ) != BitPatterns[i]) ||
7035 (usc_InReg( info, TC1R ) != BitPatterns[(i+1)%Patterncount]) ||
7036 (usc_InReg( info, TCLR ) != BitPatterns[(i+2)%Patterncount]) ||
7037 (usc_InReg( info, RCLR ) != BitPatterns[(i+3)%Patterncount]) ||
7038 (usc_InReg( info, RSR ) != BitPatterns[(i+4)%Patterncount]) ||
7039 (usc_InDmaReg( info, TBCR ) != BitPatterns[(i+5)%Patterncount]) ){
7047 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7051 } /* end of mgsl_register_test() */
7053 /* mgsl_irq_test() Perform interrupt test of the 16C32.
7055 * Arguments: info pointer to device instance data
7056 * Return Value: true if test passed, otherwise false
7058 static bool mgsl_irq_test( struct mgsl_struct *info )
7060 unsigned long EndTime;
7061 unsigned long flags;
7063 spin_lock_irqsave(&info->irq_spinlock,flags);
7067 * Setup 16C32 to interrupt on TxC pin (14MHz clock) transition.
7068 * The ISR sets irq_occurred to true.
7071 info->irq_occurred = false;
7073 /* Enable INTEN gate for ISA adapter (Port 6, Bit12) */
7074 /* Enable INTEN (Port 6, Bit12) */
7075 /* This connects the IRQ request signal to the ISA bus */
7076 /* on the ISA adapter. This has no effect for the PCI adapter */
7077 usc_OutReg( info, PCR, (unsigned short)((usc_InReg(info, PCR) | BIT13) & ~BIT12) );
7079 usc_EnableMasterIrqBit(info);
7080 usc_EnableInterrupts(info, IO_PIN);
7081 usc_ClearIrqPendingBits(info, IO_PIN);
7083 usc_UnlatchIostatusBits(info, MISCSTATUS_TXC_LATCHED);
7084 usc_EnableStatusIrqs(info, SICR_TXC_ACTIVE + SICR_TXC_INACTIVE);
7086 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7089 while( EndTime-- && !info->irq_occurred ) {
7090 msleep_interruptible(10);
7093 spin_lock_irqsave(&info->irq_spinlock,flags);
7095 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7097 return info->irq_occurred;
7099 } /* end of mgsl_irq_test() */
7103 * Perform a DMA test of the 16C32. A small frame is
7104 * transmitted via DMA from a transmit buffer to a receive buffer
7105 * using single buffer DMA mode.
7107 * Arguments: info pointer to device instance data
7108 * Return Value: true if test passed, otherwise false
7110 static bool mgsl_dma_test( struct mgsl_struct *info )
7112 unsigned short FifoLevel;
7113 unsigned long phys_addr;
7114 unsigned int FrameSize;
7118 unsigned short status=0;
7119 unsigned long EndTime;
7120 unsigned long flags;
7121 MGSL_PARAMS tmp_params;
7123 /* save current port options */
7124 memcpy(&tmp_params,&info->params,sizeof(MGSL_PARAMS));
7125 /* load default port options */
7126 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
7128 #define TESTFRAMESIZE 40
7130 spin_lock_irqsave(&info->irq_spinlock,flags);
7132 /* setup 16C32 for SDLC DMA transfer mode */
7135 usc_set_sdlc_mode(info);
7136 usc_enable_loopback(info,1);
7138 /* Reprogram the RDMR so that the 16C32 does NOT clear the count
7139 * field of the buffer entry after fetching buffer address. This
7140 * way we can detect a DMA failure for a DMA read (which should be
7141 * non-destructive to system memory) before we try and write to
7142 * memory (where a failure could corrupt system memory).
7145 /* Receive DMA mode Register (RDMR)
7147 * <15..14> 11 DMA mode = Linked List Buffer mode
7148 * <13> 1 RSBinA/L = store Rx status Block in List entry
7149 * <12> 0 1 = Clear count of List Entry after fetching
7150 * <11..10> 00 Address mode = Increment
7151 * <9> 1 Terminate Buffer on RxBound
7152 * <8> 0 Bus Width = 16bits
7153 * <7..0> ? status Bits (write as 0s)
7155 * 1110 0010 0000 0000 = 0xe200
7158 usc_OutDmaReg( info, RDMR, 0xe200 );
7160 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7163 /* SETUP TRANSMIT AND RECEIVE DMA BUFFERS */
7165 FrameSize = TESTFRAMESIZE;
7167 /* setup 1st transmit buffer entry: */
7168 /* with frame size and transmit control word */
7170 info->tx_buffer_list[0].count = FrameSize;
7171 info->tx_buffer_list[0].rcc = FrameSize;
7172 info->tx_buffer_list[0].status = 0x4000;
7174 /* build a transmit frame in 1st transmit DMA buffer */
7176 TmpPtr = info->tx_buffer_list[0].virt_addr;
7177 for (i = 0; i < FrameSize; i++ )
7180 /* setup 1st receive buffer entry: */
7181 /* clear status, set max receive buffer size */
7183 info->rx_buffer_list[0].status = 0;
7184 info->rx_buffer_list[0].count = FrameSize + 4;
7186 /* zero out the 1st receive buffer */
7188 memset( info->rx_buffer_list[0].virt_addr, 0, FrameSize + 4 );
7190 /* Set count field of next buffer entries to prevent */
7191 /* 16C32 from using buffers after the 1st one. */
7193 info->tx_buffer_list[1].count = 0;
7194 info->rx_buffer_list[1].count = 0;
7197 /***************************/
7198 /* Program 16C32 receiver. */
7199 /***************************/
7201 spin_lock_irqsave(&info->irq_spinlock,flags);
7203 /* setup DMA transfers */
7204 usc_RTCmd( info, RTCmd_PurgeRxFifo );
7206 /* program 16C32 receiver with physical address of 1st DMA buffer entry */
7207 phys_addr = info->rx_buffer_list[0].phys_entry;
7208 usc_OutDmaReg( info, NRARL, (unsigned short)phys_addr );
7209 usc_OutDmaReg( info, NRARU, (unsigned short)(phys_addr >> 16) );
7211 /* Clear the Rx DMA status bits (read RDMR) and start channel */
7212 usc_InDmaReg( info, RDMR );
7213 usc_DmaCmd( info, DmaCmd_InitRxChannel );
7215 /* Enable Receiver (RMR <1..0> = 10) */
7216 usc_OutReg( info, RMR, (unsigned short)((usc_InReg(info, RMR) & 0xfffc) | 0x0002) );
7218 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7221 /*************************************************************/
7222 /* WAIT FOR RECEIVER TO DMA ALL PARAMETERS FROM BUFFER ENTRY */
7223 /*************************************************************/
7225 /* Wait 100ms for interrupt. */
7226 EndTime = jiffies + msecs_to_jiffies(100);
7229 if (time_after(jiffies, EndTime)) {
7234 spin_lock_irqsave(&info->irq_spinlock,flags);
7235 status = usc_InDmaReg( info, RDMR );
7236 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7238 if ( !(status & BIT4) && (status & BIT5) ) {
7239 /* INITG (BIT 4) is inactive (no entry read in progress) AND */
7240 /* BUSY (BIT 5) is active (channel still active). */
7241 /* This means the buffer entry read has completed. */
7247 /******************************/
7248 /* Program 16C32 transmitter. */
7249 /******************************/
7251 spin_lock_irqsave(&info->irq_spinlock,flags);
7253 /* Program the Transmit Character Length Register (TCLR) */
7254 /* and clear FIFO (TCC is loaded with TCLR on FIFO clear) */
7256 usc_OutReg( info, TCLR, (unsigned short)info->tx_buffer_list[0].count );
7257 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7259 /* Program the address of the 1st DMA Buffer Entry in linked list */
7261 phys_addr = info->tx_buffer_list[0].phys_entry;
7262 usc_OutDmaReg( info, NTARL, (unsigned short)phys_addr );
7263 usc_OutDmaReg( info, NTARU, (unsigned short)(phys_addr >> 16) );
7265 /* unlatch Tx status bits, and start transmit channel. */
7267 usc_OutReg( info, TCSR, (unsigned short)(( usc_InReg(info, TCSR) & 0x0f00) | 0xfa) );
7268 usc_DmaCmd( info, DmaCmd_InitTxChannel );
7270 /* wait for DMA controller to fill transmit FIFO */
7272 usc_TCmd( info, TCmd_SelectTicrTxFifostatus );
7274 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7277 /**********************************/
7278 /* WAIT FOR TRANSMIT FIFO TO FILL */
7279 /**********************************/
7282 EndTime = jiffies + msecs_to_jiffies(100);
7285 if (time_after(jiffies, EndTime)) {
7290 spin_lock_irqsave(&info->irq_spinlock,flags);
7291 FifoLevel = usc_InReg(info, TICR) >> 8;
7292 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7294 if ( FifoLevel < 16 )
7297 if ( FrameSize < 32 ) {
7298 /* This frame is smaller than the entire transmit FIFO */
7299 /* so wait for the entire frame to be loaded. */
7300 if ( FifoLevel <= (32 - FrameSize) )
7308 /* Enable 16C32 transmitter. */
7310 spin_lock_irqsave(&info->irq_spinlock,flags);
7312 /* Transmit mode Register (TMR), <1..0> = 10, Enable Transmitter */
7313 usc_TCmd( info, TCmd_SendFrame );
7314 usc_OutReg( info, TMR, (unsigned short)((usc_InReg(info, TMR) & 0xfffc) | 0x0002) );
7316 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7319 /******************************/
7320 /* WAIT FOR TRANSMIT COMPLETE */
7321 /******************************/
7324 EndTime = jiffies + msecs_to_jiffies(100);
7326 /* While timer not expired wait for transmit complete */
7328 spin_lock_irqsave(&info->irq_spinlock,flags);
7329 status = usc_InReg( info, TCSR );
7330 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7332 while ( !(status & (BIT6+BIT5+BIT4+BIT2+BIT1)) ) {
7333 if (time_after(jiffies, EndTime)) {
7338 spin_lock_irqsave(&info->irq_spinlock,flags);
7339 status = usc_InReg( info, TCSR );
7340 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7346 /* CHECK FOR TRANSMIT ERRORS */
7347 if ( status & (BIT5 + BIT1) )
7352 /* WAIT FOR RECEIVE COMPLETE */
7355 EndTime = jiffies + msecs_to_jiffies(100);
7357 /* Wait for 16C32 to write receive status to buffer entry. */
7358 status=info->rx_buffer_list[0].status;
7359 while ( status == 0 ) {
7360 if (time_after(jiffies, EndTime)) {
7364 status=info->rx_buffer_list[0].status;
7370 /* CHECK FOR RECEIVE ERRORS */
7371 status = info->rx_buffer_list[0].status;
7373 if ( status & (BIT8 + BIT3 + BIT1) ) {
7374 /* receive error has occurred */
7377 if ( memcmp( info->tx_buffer_list[0].virt_addr ,
7378 info->rx_buffer_list[0].virt_addr, FrameSize ) ){
7384 spin_lock_irqsave(&info->irq_spinlock,flags);
7386 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7388 /* restore current port options */
7389 memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
7393 } /* end of mgsl_dma_test() */
7395 /* mgsl_adapter_test()
7397 * Perform the register, IRQ, and DMA tests for the 16C32.
7399 * Arguments: info pointer to device instance data
7400 * Return Value: 0 if success, otherwise -ENODEV
7402 static int mgsl_adapter_test( struct mgsl_struct *info )
7404 if ( debug_level >= DEBUG_LEVEL_INFO )
7405 printk( "%s(%d):Testing device %s\n",
7406 __FILE__,__LINE__,info->device_name );
7408 if ( !mgsl_register_test( info ) ) {
7409 info->init_error = DiagStatus_AddressFailure;
7410 printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
7411 __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
7415 if ( !mgsl_irq_test( info ) ) {
7416 info->init_error = DiagStatus_IrqFailure;
7417 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
7418 __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
7422 if ( !mgsl_dma_test( info ) ) {
7423 info->init_error = DiagStatus_DmaFailure;
7424 printk( "%s(%d):DMA test failure for device %s DMA=%d\n",
7425 __FILE__,__LINE__,info->device_name, (unsigned short)(info->dma_level) );
7429 if ( debug_level >= DEBUG_LEVEL_INFO )
7430 printk( "%s(%d):device %s passed diagnostics\n",
7431 __FILE__,__LINE__,info->device_name );
7435 } /* end of mgsl_adapter_test() */
7437 /* mgsl_memory_test()
7439 * Test the shared memory on a PCI adapter.
7441 * Arguments: info pointer to device instance data
7442 * Return Value: true if test passed, otherwise false
7444 static bool mgsl_memory_test( struct mgsl_struct *info )
7446 static unsigned long BitPatterns[] =
7447 { 0x0, 0x55555555, 0xaaaaaaaa, 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
7448 unsigned long Patterncount = ARRAY_SIZE(BitPatterns);
7450 unsigned long TestLimit = SHARED_MEM_ADDRESS_SIZE/sizeof(unsigned long);
7451 unsigned long * TestAddr;
7453 if ( info->bus_type != MGSL_BUS_TYPE_PCI )
7456 TestAddr = (unsigned long *)info->memory_base;
7458 /* Test data lines with test pattern at one location. */
7460 for ( i = 0 ; i < Patterncount ; i++ ) {
7461 *TestAddr = BitPatterns[i];
7462 if ( *TestAddr != BitPatterns[i] )
7466 /* Test address lines with incrementing pattern over */
7467 /* entire address range. */
7469 for ( i = 0 ; i < TestLimit ; i++ ) {
7474 TestAddr = (unsigned long *)info->memory_base;
7476 for ( i = 0 ; i < TestLimit ; i++ ) {
7477 if ( *TestAddr != i * 4 )
7482 memset( info->memory_base, 0, SHARED_MEM_ADDRESS_SIZE );
7486 } /* End Of mgsl_memory_test() */
7489 /* mgsl_load_pci_memory()
7491 * Load a large block of data into the PCI shared memory.
7492 * Use this instead of memcpy() or memmove() to move data
7493 * into the PCI shared memory.
7497 * This function prevents the PCI9050 interface chip from hogging
7498 * the adapter local bus, which can starve the 16C32 by preventing
7499 * 16C32 bus master cycles.
7501 * The PCI9050 documentation says that the 9050 will always release
7502 * control of the local bus after completing the current read
7503 * or write operation.
7505 * It appears that as long as the PCI9050 write FIFO is full, the
7506 * PCI9050 treats all of the writes as a single burst transaction
7507 * and will not release the bus. This causes DMA latency problems
7508 * at high speeds when copying large data blocks to the shared
7511 * This function in effect, breaks the a large shared memory write
7512 * into multiple transations by interleaving a shared memory read
7513 * which will flush the write FIFO and 'complete' the write
7514 * transation. This allows any pending DMA request to gain control
7515 * of the local bus in a timely fasion.
7519 * TargetPtr pointer to target address in PCI shared memory
7520 * SourcePtr pointer to source buffer for data
7521 * count count in bytes of data to copy
7523 * Return Value: None
7525 static void mgsl_load_pci_memory( char* TargetPtr, const char* SourcePtr,
7526 unsigned short count )
7528 /* 16 32-bit writes @ 60ns each = 960ns max latency on local bus */
7529 #define PCI_LOAD_INTERVAL 64
7531 unsigned short Intervalcount = count / PCI_LOAD_INTERVAL;
7532 unsigned short Index;
7533 unsigned long Dummy;
7535 for ( Index = 0 ; Index < Intervalcount ; Index++ )
7537 memcpy(TargetPtr, SourcePtr, PCI_LOAD_INTERVAL);
7538 Dummy = *((volatile unsigned long *)TargetPtr);
7539 TargetPtr += PCI_LOAD_INTERVAL;
7540 SourcePtr += PCI_LOAD_INTERVAL;
7543 memcpy( TargetPtr, SourcePtr, count % PCI_LOAD_INTERVAL );
7545 } /* End Of mgsl_load_pci_memory() */
7547 static void mgsl_trace_block(struct mgsl_struct *info,const char* data, int count, int xmit)
7552 printk("%s tx data:\n",info->device_name);
7554 printk("%s rx data:\n",info->device_name);
7562 for(i=0;i<linecount;i++)
7563 printk("%02X ",(unsigned char)data[i]);
7566 for(i=0;i<linecount;i++) {
7567 if (data[i]>=040 && data[i]<=0176)
7568 printk("%c",data[i]);
7577 } /* end of mgsl_trace_block() */
7579 /* mgsl_tx_timeout()
7581 * called when HDLC frame times out
7582 * update stats and do tx completion processing
7584 * Arguments: context pointer to device instance data
7585 * Return Value: None
7587 static void mgsl_tx_timeout(unsigned long context)
7589 struct mgsl_struct *info = (struct mgsl_struct*)context;
7590 unsigned long flags;
7592 if ( debug_level >= DEBUG_LEVEL_INFO )
7593 printk( "%s(%d):mgsl_tx_timeout(%s)\n",
7594 __FILE__,__LINE__,info->device_name);
7595 if(info->tx_active &&
7596 (info->params.mode == MGSL_MODE_HDLC ||
7597 info->params.mode == MGSL_MODE_RAW) ) {
7598 info->icount.txtimeout++;
7600 spin_lock_irqsave(&info->irq_spinlock,flags);
7601 info->tx_active = false;
7602 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
7604 if ( info->params.flags & HDLC_FLAG_HDLC_LOOPMODE )
7605 usc_loopmode_cancel_transmit( info );
7607 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7609 #if SYNCLINK_GENERIC_HDLC
7611 hdlcdev_tx_done(info);
7614 mgsl_bh_transmit(info);
7616 } /* end of mgsl_tx_timeout() */
7618 /* signal that there are no more frames to send, so that
7619 * line is 'released' by echoing RxD to TxD when current
7620 * transmission is complete (or immediately if no tx in progress).
7622 static int mgsl_loopmode_send_done( struct mgsl_struct * info )
7624 unsigned long flags;
7626 spin_lock_irqsave(&info->irq_spinlock,flags);
7627 if (info->params.flags & HDLC_FLAG_HDLC_LOOPMODE) {
7628 if (info->tx_active)
7629 info->loopmode_send_done_requested = true;
7631 usc_loopmode_send_done(info);
7633 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7638 /* release the line by echoing RxD to TxD
7639 * upon completion of a transmit frame
7641 static void usc_loopmode_send_done( struct mgsl_struct * info )
7643 info->loopmode_send_done_requested = false;
7644 /* clear CMR:13 to 0 to start echoing RxData to TxData */
7645 info->cmr_value &= ~BIT13;
7646 usc_OutReg(info, CMR, info->cmr_value);
7649 /* abort a transmit in progress while in HDLC LoopMode
7651 static void usc_loopmode_cancel_transmit( struct mgsl_struct * info )
7653 /* reset tx dma channel and purge TxFifo */
7654 usc_RTCmd( info, RTCmd_PurgeTxFifo );
7655 usc_DmaCmd( info, DmaCmd_ResetTxChannel );
7656 usc_loopmode_send_done( info );
7659 /* for HDLC/SDLC LoopMode, setting CMR:13 after the transmitter is enabled
7660 * is an Insert Into Loop action. Upon receipt of a GoAhead sequence (RxAbort)
7661 * we must clear CMR:13 to begin repeating TxData to RxData
7663 static void usc_loopmode_insert_request( struct mgsl_struct * info )
7665 info->loopmode_insert_requested = true;
7667 /* enable RxAbort irq. On next RxAbort, clear CMR:13 to
7668 * begin repeating TxData on RxData (complete insertion)
7670 usc_OutReg( info, RICR,
7671 (usc_InReg( info, RICR ) | RXSTATUS_ABORT_RECEIVED ) );
7673 /* set CMR:13 to insert into loop on next GoAhead (RxAbort) */
7674 info->cmr_value |= BIT13;
7675 usc_OutReg(info, CMR, info->cmr_value);
7678 /* return 1 if station is inserted into the loop, otherwise 0
7680 static int usc_loopmode_active( struct mgsl_struct * info)
7682 return usc_InReg( info, CCSR ) & BIT7 ? 1 : 0 ;
7685 #if SYNCLINK_GENERIC_HDLC
7688 * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
7689 * set encoding and frame check sequence (FCS) options
7691 * dev pointer to network device structure
7692 * encoding serial encoding setting
7693 * parity FCS setting
7695 * returns 0 if success, otherwise error code
7697 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
7698 unsigned short parity)
7700 struct mgsl_struct *info = dev_to_port(dev);
7701 unsigned char new_encoding;
7702 unsigned short new_crctype;
7704 /* return error if TTY interface open */
7710 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
7711 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
7712 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
7713 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
7714 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
7715 default: return -EINVAL;
7720 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
7721 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
7722 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
7723 default: return -EINVAL;
7726 info->params.encoding = new_encoding;
7727 info->params.crc_type = new_crctype;
7729 /* if network interface up, reprogram hardware */
7731 mgsl_program_hw(info);
7737 * called by generic HDLC layer to send frame
7739 * skb socket buffer containing HDLC frame
7740 * dev pointer to network device structure
7742 * returns 0 if success, otherwise error code
7744 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
7746 struct mgsl_struct *info = dev_to_port(dev);
7747 struct net_device_stats *stats = hdlc_stats(dev);
7748 unsigned long flags;
7750 if (debug_level >= DEBUG_LEVEL_INFO)
7751 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
7753 /* stop sending until this frame completes */
7754 netif_stop_queue(dev);
7756 /* copy data to device buffers */
7757 info->xmit_cnt = skb->len;
7758 mgsl_load_tx_dma_buffer(info, skb->data, skb->len);
7760 /* update network statistics */
7761 stats->tx_packets++;
7762 stats->tx_bytes += skb->len;
7764 /* done with socket buffer, so free it */
7767 /* save start time for transmit timeout detection */
7768 dev->trans_start = jiffies;
7770 /* start hardware transmitter if necessary */
7771 spin_lock_irqsave(&info->irq_spinlock,flags);
7772 if (!info->tx_active)
7773 usc_start_transmitter(info);
7774 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7780 * called by network layer when interface enabled
7781 * claim resources and initialize hardware
7783 * dev pointer to network device structure
7785 * returns 0 if success, otherwise error code
7787 static int hdlcdev_open(struct net_device *dev)
7789 struct mgsl_struct *info = dev_to_port(dev);
7791 unsigned long flags;
7793 if (debug_level >= DEBUG_LEVEL_INFO)
7794 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
7796 /* generic HDLC layer open processing */
7797 if ((rc = hdlc_open(dev)))
7800 /* arbitrate between network and tty opens */
7801 spin_lock_irqsave(&info->netlock, flags);
7802 if (info->count != 0 || info->netcount != 0) {
7803 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
7804 spin_unlock_irqrestore(&info->netlock, flags);
7808 spin_unlock_irqrestore(&info->netlock, flags);
7810 /* claim resources and init adapter */
7811 if ((rc = startup(info)) != 0) {
7812 spin_lock_irqsave(&info->netlock, flags);
7814 spin_unlock_irqrestore(&info->netlock, flags);
7818 /* assert DTR and RTS, apply hardware settings */
7819 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
7820 mgsl_program_hw(info);
7822 /* enable network layer transmit */
7823 dev->trans_start = jiffies;
7824 netif_start_queue(dev);
7826 /* inform generic HDLC layer of current DCD status */
7827 spin_lock_irqsave(&info->irq_spinlock, flags);
7828 usc_get_serial_signals(info);
7829 spin_unlock_irqrestore(&info->irq_spinlock, flags);
7830 if (info->serial_signals & SerialSignal_DCD)
7831 netif_carrier_on(dev);
7833 netif_carrier_off(dev);
7838 * called by network layer when interface is disabled
7839 * shutdown hardware and release resources
7841 * dev pointer to network device structure
7843 * returns 0 if success, otherwise error code
7845 static int hdlcdev_close(struct net_device *dev)
7847 struct mgsl_struct *info = dev_to_port(dev);
7848 unsigned long flags;
7850 if (debug_level >= DEBUG_LEVEL_INFO)
7851 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
7853 netif_stop_queue(dev);
7855 /* shutdown adapter and release resources */
7860 spin_lock_irqsave(&info->netlock, flags);
7862 spin_unlock_irqrestore(&info->netlock, flags);
7868 * called by network layer to process IOCTL call to network device
7870 * dev pointer to network device structure
7871 * ifr pointer to network interface request structure
7872 * cmd IOCTL command code
7874 * returns 0 if success, otherwise error code
7876 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
7878 const size_t size = sizeof(sync_serial_settings);
7879 sync_serial_settings new_line;
7880 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
7881 struct mgsl_struct *info = dev_to_port(dev);
7884 if (debug_level >= DEBUG_LEVEL_INFO)
7885 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
7887 /* return error if TTY interface open */
7891 if (cmd != SIOCWANDEV)
7892 return hdlc_ioctl(dev, ifr, cmd);
7894 switch(ifr->ifr_settings.type) {
7895 case IF_GET_IFACE: /* return current sync_serial_settings */
7897 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
7898 if (ifr->ifr_settings.size < size) {
7899 ifr->ifr_settings.size = size; /* data size wanted */
7903 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7904 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7905 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7906 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7909 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
7910 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
7911 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
7912 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
7913 default: new_line.clock_type = CLOCK_DEFAULT;
7916 new_line.clock_rate = info->params.clock_speed;
7917 new_line.loopback = info->params.loopback ? 1:0;
7919 if (copy_to_user(line, &new_line, size))
7923 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
7925 if(!capable(CAP_NET_ADMIN))
7927 if (copy_from_user(&new_line, line, size))
7930 switch (new_line.clock_type)
7932 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
7933 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
7934 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
7935 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
7936 case CLOCK_DEFAULT: flags = info->params.flags &
7937 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7938 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7939 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7940 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
7941 default: return -EINVAL;
7944 if (new_line.loopback != 0 && new_line.loopback != 1)
7947 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
7948 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
7949 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
7950 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
7951 info->params.flags |= flags;
7953 info->params.loopback = new_line.loopback;
7955 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
7956 info->params.clock_speed = new_line.clock_rate;
7958 info->params.clock_speed = 0;
7960 /* if network interface up, reprogram hardware */
7962 mgsl_program_hw(info);
7966 return hdlc_ioctl(dev, ifr, cmd);
7971 * called by network layer when transmit timeout is detected
7973 * dev pointer to network device structure
7975 static void hdlcdev_tx_timeout(struct net_device *dev)
7977 struct mgsl_struct *info = dev_to_port(dev);
7978 struct net_device_stats *stats = hdlc_stats(dev);
7979 unsigned long flags;
7981 if (debug_level >= DEBUG_LEVEL_INFO)
7982 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
7985 stats->tx_aborted_errors++;
7987 spin_lock_irqsave(&info->irq_spinlock,flags);
7988 usc_stop_transmitter(info);
7989 spin_unlock_irqrestore(&info->irq_spinlock,flags);
7991 netif_wake_queue(dev);
7995 * called by device driver when transmit completes
7996 * reenable network layer transmit if stopped
7998 * info pointer to device instance information
8000 static void hdlcdev_tx_done(struct mgsl_struct *info)
8002 if (netif_queue_stopped(info->netdev))
8003 netif_wake_queue(info->netdev);
8007 * called by device driver when frame received
8008 * pass frame to network layer
8010 * info pointer to device instance information
8011 * buf pointer to buffer contianing frame data
8012 * size count of data bytes in buf
8014 static void hdlcdev_rx(struct mgsl_struct *info, char *buf, int size)
8016 struct sk_buff *skb = dev_alloc_skb(size);
8017 struct net_device *dev = info->netdev;
8018 struct net_device_stats *stats = hdlc_stats(dev);
8020 if (debug_level >= DEBUG_LEVEL_INFO)
8021 printk("hdlcdev_rx(%s)\n",dev->name);
8024 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
8025 stats->rx_dropped++;
8029 memcpy(skb_put(skb, size),buf,size);
8031 skb->protocol = hdlc_type_trans(skb, info->netdev);
8033 stats->rx_packets++;
8034 stats->rx_bytes += size;
8038 info->netdev->last_rx = jiffies;
8042 * called by device driver when adding device instance
8043 * do generic HDLC initialization
8045 * info pointer to device instance information
8047 * returns 0 if success, otherwise error code
8049 static int hdlcdev_init(struct mgsl_struct *info)
8052 struct net_device *dev;
8055 /* allocate and initialize network and HDLC layer objects */
8057 if (!(dev = alloc_hdlcdev(info))) {
8058 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
8062 /* for network layer reporting purposes only */
8063 dev->base_addr = info->io_base;
8064 dev->irq = info->irq_level;
8065 dev->dma = info->dma_level;
8067 /* network layer callbacks and settings */
8068 dev->do_ioctl = hdlcdev_ioctl;
8069 dev->open = hdlcdev_open;
8070 dev->stop = hdlcdev_close;
8071 dev->tx_timeout = hdlcdev_tx_timeout;
8072 dev->watchdog_timeo = 10*HZ;
8073 dev->tx_queue_len = 50;
8075 /* generic HDLC layer callbacks and settings */
8076 hdlc = dev_to_hdlc(dev);
8077 hdlc->attach = hdlcdev_attach;
8078 hdlc->xmit = hdlcdev_xmit;
8080 /* register objects with HDLC layer */
8081 if ((rc = register_hdlc_device(dev))) {
8082 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
8092 * called by device driver when removing device instance
8093 * do generic HDLC cleanup
8095 * info pointer to device instance information
8097 static void hdlcdev_exit(struct mgsl_struct *info)
8099 unregister_hdlc_device(info->netdev);
8100 free_netdev(info->netdev);
8101 info->netdev = NULL;
8104 #endif /* CONFIG_HDLC */
8107 static int __devinit synclink_init_one (struct pci_dev *dev,
8108 const struct pci_device_id *ent)
8110 struct mgsl_struct *info;
8112 if (pci_enable_device(dev)) {
8113 printk("error enabling pci device %p\n", dev);
8117 if (!(info = mgsl_allocate_device())) {
8118 printk("can't allocate device instance data.\n");
8122 /* Copy user configuration info to device instance data */
8124 info->io_base = pci_resource_start(dev, 2);
8125 info->irq_level = dev->irq;
8126 info->phys_memory_base = pci_resource_start(dev, 3);
8128 /* Because veremap only works on page boundaries we must map
8129 * a larger area than is actually implemented for the LCR
8130 * memory range. We map a full page starting at the page boundary.
8132 info->phys_lcr_base = pci_resource_start(dev, 0);
8133 info->lcr_offset = info->phys_lcr_base & (PAGE_SIZE-1);
8134 info->phys_lcr_base &= ~(PAGE_SIZE-1);
8136 info->bus_type = MGSL_BUS_TYPE_PCI;
8137 info->io_addr_size = 8;
8138 info->irq_flags = IRQF_SHARED;
8140 if (dev->device == 0x0210) {
8141 /* Version 1 PCI9030 based universal PCI adapter */
8142 info->misc_ctrl_value = 0x007c4080;
8143 info->hw_version = 1;
8145 /* Version 0 PCI9050 based 5V PCI adapter
8146 * A PCI9050 bug prevents reading LCR registers if
8147 * LCR base address bit 7 is set. Maintain shadow
8148 * value so we can write to LCR misc control reg.
8150 info->misc_ctrl_value = 0x087e4546;
8151 info->hw_version = 0;
8154 mgsl_add_device(info);
8159 static void __devexit synclink_remove_one (struct pci_dev *dev)