err.no Git - linux-2.6/blob - drivers/char/synclinkmp.c

   1 /*
   2  * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
   3  *
   4  * Device driver for Microgate SyncLink Multiport
   5  * high speed multiprotocol serial adapter.
   6  *
   7  * written by Paul Fulghum for Microgate Corporation
   8  * paulkf@microgate.com
   9  *
  10  * Microgate and SyncLink are trademarks of Microgate Corporation
  11  *
  12  * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
  13  * This code is released under the GNU General Public License (GPL)
  14  *
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  16  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  25  * OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
  29 #if defined(__i386__)
  30 #  define BREAKPOINT() asm("   int $3");
  31 #else
  32 #  define BREAKPOINT() { }
  33 #endif
  34
  35 #define MAX_DEVICES 12
  36
  37 #include <linux/module.h>
  38 #include <linux/errno.h>
  39 #include <linux/signal.h>
  40 #include <linux/sched.h>
  41 #include <linux/timer.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/pci.h>
  44 #include <linux/tty.h>
  45 #include <linux/tty_flip.h>
  46 #include <linux/serial.h>
  47 #include <linux/major.h>
  48 #include <linux/string.h>
  49 #include <linux/fcntl.h>
  50 #include <linux/ptrace.h>
  51 #include <linux/ioport.h>
  52 #include <linux/mm.h>
  53 #include <linux/slab.h>
  54 #include <linux/netdevice.h>
  55 #include <linux/vmalloc.h>
  56 #include <linux/init.h>
  57 #include <linux/delay.h>
  58 #include <linux/ioctl.h>
  59
  60 #include <asm/system.h>
  61 #include <asm/io.h>
  62 #include <asm/irq.h>
  63 #include <asm/dma.h>
  64 #include <linux/bitops.h>
  65 #include <asm/types.h>
  66 #include <linux/termios.h>
  67 #include <linux/workqueue.h>
  68 #include <linux/hdlc.h>
  69
  70 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
  71 #define SYNCLINK_GENERIC_HDLC 1
  72 #else
  73 #define SYNCLINK_GENERIC_HDLC 0
  74 #endif
  75
  76 #define GET_USER(error,value,addr) error = get_user(value,addr)
  77 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  78 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  79 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  80
  81 #include <asm/uaccess.h>
  82
  83 #include "linux/synclink.h"
  84
  85 static MGSL_PARAMS default_params = {
  86         MGSL_MODE_HDLC,                 /* unsigned long mode */
  87         0,                              /* unsigned char loopback; */
  88         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  89         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  90         0,                              /* unsigned long clock_speed; */
  91         0xff,                           /* unsigned char addr_filter; */
  92         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  93         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
  94         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
  95         9600,                           /* unsigned long data_rate; */
  96         8,                              /* unsigned char data_bits; */
  97         1,                              /* unsigned char stop_bits; */
  98         ASYNC_PARITY_NONE               /* unsigned char parity; */
  99 };
 100
 101 /* size in bytes of DMA data buffers */
 102 #define SCABUFSIZE      1024
 103 #define SCA_MEM_SIZE    0x40000
 104 #define SCA_BASE_SIZE   512
 105 #define SCA_REG_SIZE    16
 106 #define SCA_MAX_PORTS   4
 107 #define SCAMAXDESC      128
 108
 109 #define BUFFERLISTSIZE  4096
 110
 111 /* SCA-I style DMA buffer descriptor */
 112 typedef struct _SCADESC
 113 {
 114         u16     next;           /* lower l6 bits of next descriptor addr */
 115         u16     buf_ptr;        /* lower 16 bits of buffer addr */
 116         u8      buf_base;       /* upper 8 bits of buffer addr */
 117         u8      pad1;
 118         u16     length;         /* length of buffer */
 119         u8      status;         /* status of buffer */
 120         u8      pad2;
 121 } SCADESC, *PSCADESC;
 122
 123 typedef struct _SCADESC_EX
 124 {
 125         /* device driver bookkeeping section */
 126         char    *virt_addr;     /* virtual address of data buffer */
 127         u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
 128 } SCADESC_EX, *PSCADESC_EX;
 129
 130 /* The queue of BH actions to be performed */
 131
 132 #define BH_RECEIVE  1
 133 #define BH_TRANSMIT 2
 134 #define BH_STATUS   4
 135
 136 #define IO_PIN_SHUTDOWN_LIMIT 100
 137
 138 struct  _input_signal_events {
 139         int     ri_up;
 140         int     ri_down;
 141         int     dsr_up;
 142         int     dsr_down;
 143         int     dcd_up;
 144         int     dcd_down;
 145         int     cts_up;
 146         int     cts_down;
 147 };
 148
 149 /*
 150  * Device instance data structure
 151  */
 152 typedef struct _synclinkmp_info {
 153         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
 154         int                     magic;
 155         int                     flags;
 156         int                     count;          /* count of opens */
 157         int                     line;
 158         unsigned short          close_delay;
 159         unsigned short          closing_wait;   /* time to wait before closing */
 160
 161         struct mgsl_icount      icount;
 162
 163         struct tty_struct       *tty;
 164         int                     timeout;
 165         int                     x_char;         /* xon/xoff character */
 166         int                     blocked_open;   /* # of blocked opens */
 167         u16                     read_status_mask1;  /* break detection (SR1 indications) */
 168         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
 169         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
 170         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
 171         unsigned char           *tx_buf;
 172         int                     tx_put;
 173         int                     tx_get;
 174         int                     tx_count;
 175
 176         wait_queue_head_t       open_wait;
 177         wait_queue_head_t       close_wait;
 178
 179         wait_queue_head_t       status_event_wait_q;
 180         wait_queue_head_t       event_wait_q;
 181         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 182         struct _synclinkmp_info *next_device;   /* device list link */
 183         struct timer_list       status_timer;   /* input signal status check timer */
 184
 185         spinlock_t lock;                /* spinlock for synchronizing with ISR */
 186         struct work_struct task;                        /* task structure for scheduling bh */
 187
 188         u32 max_frame_size;                     /* as set by device config */
 189
 190         u32 pending_bh;
 191
 192         int bh_running;                         /* Protection from multiple */
 193         int isr_overflow;
 194         int bh_requested;
 195
 196         int dcd_chkcount;                       /* check counts to prevent */
 197         int cts_chkcount;                       /* too many IRQs if a signal */
 198         int dsr_chkcount;                       /* is floating */
 199         int ri_chkcount;
 200
 201         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
 202         unsigned long buffer_list_phys;
 203
 204         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
 205         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
 206         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
 207         unsigned int current_rx_buf;
 208
 209         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
 210         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
 211         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
 212         unsigned int last_tx_buf;
 213
 214         unsigned char *tmp_rx_buf;
 215         unsigned int tmp_rx_buf_count;
 216
 217         int rx_enabled;
 218         int rx_overflow;
 219
 220         int tx_enabled;
 221         int tx_active;
 222         u32 idle_mode;
 223
 224         unsigned char ie0_value;
 225         unsigned char ie1_value;
 226         unsigned char ie2_value;
 227         unsigned char ctrlreg_value;
 228         unsigned char old_signals;
 229
 230         char device_name[25];                   /* device instance name */
 231
 232         int port_count;
 233         int adapter_num;
 234         int port_num;
 235
 236         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
 237
 238         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
 239
 240         unsigned int irq_level;                 /* interrupt level */
 241         unsigned long irq_flags;
 242         int irq_requested;                      /* nonzero if IRQ requested */
 243
 244         MGSL_PARAMS params;                     /* communications parameters */
 245
 246         unsigned char serial_signals;           /* current serial signal states */
 247
 248         int irq_occurred;                       /* for diagnostics use */
 249         unsigned int init_error;                /* Initialization startup error */
 250
 251         u32 last_mem_alloc;
 252         unsigned char* memory_base;             /* shared memory address (PCI only) */
 253         u32 phys_memory_base;
 254         int shared_mem_requested;
 255
 256         unsigned char* sca_base;                /* HD64570 SCA Memory address */
 257         u32 phys_sca_base;
 258         u32 sca_offset;
 259         int sca_base_requested;
 260
 261         unsigned char* lcr_base;                /* local config registers (PCI only) */
 262         u32 phys_lcr_base;
 263         u32 lcr_offset;
 264         int lcr_mem_requested;
 265
 266         unsigned char* statctrl_base;           /* status/control register memory */
 267         u32 phys_statctrl_base;
 268         u32 statctrl_offset;
 269         int sca_statctrl_requested;
 270
 271         u32 misc_ctrl_value;
 272         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 273         char char_buf[MAX_ASYNC_BUFFER_SIZE];
 274         BOOLEAN drop_rts_on_tx_done;
 275
 276         struct  _input_signal_events    input_signal_events;
 277
 278         /* SPPP/Cisco HDLC device parts */
 279         int netcount;
 280         int dosyncppp;
 281         spinlock_t netlock;
 282
 283 #if SYNCLINK_GENERIC_HDLC
 284         struct net_device *netdev;
 285 #endif
 286
 287 } SLMP_INFO;
 288
 289 #define MGSL_MAGIC 0x5401
 290
 291 /*
 292  * define serial signal status change macros
 293  */
 294 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
 295 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
 296 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
 297 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
 298
 299 /* Common Register macros */
 300 #define LPR     0x00
 301 #define PABR0   0x02
 302 #define PABR1   0x03
 303 #define WCRL    0x04
 304 #define WCRM    0x05
 305 #define WCRH    0x06
 306 #define DPCR    0x08
 307 #define DMER    0x09
 308 #define ISR0    0x10
 309 #define ISR1    0x11
 310 #define ISR2    0x12
 311 #define IER0    0x14
 312 #define IER1    0x15
 313 #define IER2    0x16
 314 #define ITCR    0x18
 315 #define INTVR   0x1a
 316 #define IMVR    0x1c
 317
 318 /* MSCI Register macros */
 319 #define TRB     0x20
 320 #define TRBL    0x20
 321 #define TRBH    0x21
 322 #define SR0     0x22
 323 #define SR1     0x23
 324 #define SR2     0x24
 325 #define SR3     0x25
 326 #define FST     0x26
 327 #define IE0     0x28
 328 #define IE1     0x29
 329 #define IE2     0x2a
 330 #define FIE     0x2b
 331 #define CMD     0x2c
 332 #define MD0     0x2e
 333 #define MD1     0x2f
 334 #define MD2     0x30
 335 #define CTL     0x31
 336 #define SA0     0x32
 337 #define SA1     0x33
 338 #define IDL     0x34
 339 #define TMC     0x35
 340 #define RXS     0x36
 341 #define TXS     0x37
 342 #define TRC0    0x38
 343 #define TRC1    0x39
 344 #define RRC     0x3a
 345 #define CST0    0x3c
 346 #define CST1    0x3d
 347
 348 /* Timer Register Macros */
 349 #define TCNT    0x60
 350 #define TCNTL   0x60
 351 #define TCNTH   0x61
 352 #define TCONR   0x62
 353 #define TCONRL  0x62
 354 #define TCONRH  0x63
 355 #define TMCS    0x64
 356 #define TEPR    0x65
 357
 358 /* DMA Controller Register macros */
 359 #define DARL    0x80
 360 #define DARH    0x81
 361 #define DARB    0x82
 362 #define BAR     0x80
 363 #define BARL    0x80
 364 #define BARH    0x81
 365 #define BARB    0x82
 366 #define SAR     0x84
 367 #define SARL    0x84
 368 #define SARH    0x85
 369 #define SARB    0x86
 370 #define CPB     0x86
 371 #define CDA     0x88
 372 #define CDAL    0x88
 373 #define CDAH    0x89
 374 #define EDA     0x8a
 375 #define EDAL    0x8a
 376 #define EDAH    0x8b
 377 #define BFL     0x8c
 378 #define BFLL    0x8c
 379 #define BFLH    0x8d
 380 #define BCR     0x8e
 381 #define BCRL    0x8e
 382 #define BCRH    0x8f
 383 #define DSR     0x90
 384 #define DMR     0x91
 385 #define FCT     0x93
 386 #define DIR     0x94
 387 #define DCMD    0x95
 388
 389 /* combine with timer or DMA register address */
 390 #define TIMER0  0x00
 391 #define TIMER1  0x08
 392 #define TIMER2  0x10
 393 #define TIMER3  0x18
 394 #define RXDMA   0x00
 395 #define TXDMA   0x20
 396
 397 /* SCA Command Codes */
 398 #define NOOP            0x00
 399 #define TXRESET         0x01
 400 #define TXENABLE        0x02
 401 #define TXDISABLE       0x03
 402 #define TXCRCINIT       0x04
 403 #define TXCRCEXCL       0x05
 404 #define TXEOM           0x06
 405 #define TXABORT         0x07
 406 #define MPON            0x08
 407 #define TXBUFCLR        0x09
 408 #define RXRESET         0x11
 409 #define RXENABLE        0x12
 410 #define RXDISABLE       0x13
 411 #define RXCRCINIT       0x14
 412 #define RXREJECT        0x15
 413 #define SEARCHMP        0x16
 414 #define RXCRCEXCL       0x17
 415 #define RXCRCCALC       0x18
 416 #define CHRESET         0x21
 417 #define HUNT            0x31
 418
 419 /* DMA command codes */
 420 #define SWABORT         0x01
 421 #define FEICLEAR        0x02
 422
 423 /* IE0 */
 424 #define TXINTE          BIT7
 425 #define RXINTE          BIT6
 426 #define TXRDYE          BIT1
 427 #define RXRDYE          BIT0
 428
 429 /* IE1 & SR1 */
 430 #define UDRN    BIT7
 431 #define IDLE    BIT6
 432 #define SYNCD   BIT4
 433 #define FLGD    BIT4
 434 #define CCTS    BIT3
 435 #define CDCD    BIT2
 436 #define BRKD    BIT1
 437 #define ABTD    BIT1
 438 #define GAPD    BIT1
 439 #define BRKE    BIT0
 440 #define IDLD    BIT0
 441
 442 /* IE2 & SR2 */
 443 #define EOM     BIT7
 444 #define PMP     BIT6
 445 #define SHRT    BIT6
 446 #define PE      BIT5
 447 #define ABT     BIT5
 448 #define FRME    BIT4
 449 #define RBIT    BIT4
 450 #define OVRN    BIT3
 451 #define CRCE    BIT2
 452
 453
 454 /*
 455  * Global linked list of SyncLink devices
 456  */
 457 static SLMP_INFO *synclinkmp_device_list = NULL;
 458 static int synclinkmp_adapter_count = -1;
 459 static int synclinkmp_device_count = 0;
 460
 461 /*
 462  * Set this param to non-zero to load eax with the
 463  * .text section address and breakpoint on module load.
 464  * This is useful for use with gdb and add-symbol-file command.
 465  */
 466 static int break_on_load=0;
 467
 468 /*
 469  * Driver major number, defaults to zero to get auto
 470  * assigned major number. May be forced as module parameter.
 471  */
 472 static int ttymajor=0;
 473
 474 /*
 475  * Array of user specified options for ISA adapters.
 476  */
 477 static int debug_level = 0;
 478 static int maxframe[MAX_DEVICES] = {0,};
 479 static int dosyncppp[MAX_DEVICES] = {0,};
 480
 481 module_param(break_on_load, bool, 0);
 482 module_param(ttymajor, int, 0);
 483 module_param(debug_level, int, 0);
 484 module_param_array(maxframe, int, NULL, 0);
 485 module_param_array(dosyncppp, int, NULL, 0);
 486
 487 static char *driver_name = "SyncLink MultiPort driver";
 488 static char *driver_version = "$Revision: 4.38 $";
 489
 490 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 491 static void synclinkmp_remove_one(struct pci_dev *dev);
 492
 493 static struct pci_device_id synclinkmp_pci_tbl[] = {
 494         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
 495         { 0, }, /* terminate list */
 496 };
 497 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
 498
 499 MODULE_LICENSE("GPL");
 500
 501 static struct pci_driver synclinkmp_pci_driver = {
 502         .name           = "synclinkmp",
 503         .id_table       = synclinkmp_pci_tbl,
 504         .probe          = synclinkmp_init_one,
 505         .remove         = __devexit_p(synclinkmp_remove_one),
 506 };
 507
 508
 509 static struct tty_driver *serial_driver;
 510
 511 /* number of characters left in xmit buffer before we ask for more */
 512 #define WAKEUP_CHARS 256
 513
 514
 515 /* tty callbacks */
 516
 517 static int  open(struct tty_struct *tty, struct file * filp);
 518 static void close(struct tty_struct *tty, struct file * filp);
 519 static void hangup(struct tty_struct *tty);
 520 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 521
 522 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 523 static void put_char(struct tty_struct *tty, unsigned char ch);
 524 static void send_xchar(struct tty_struct *tty, char ch);
 525 static void wait_until_sent(struct tty_struct *tty, int timeout);
 526 static int  write_room(struct tty_struct *tty);
 527 static void flush_chars(struct tty_struct *tty);
 528 static void flush_buffer(struct tty_struct *tty);
 529 static void tx_hold(struct tty_struct *tty);
 530 static void tx_release(struct tty_struct *tty);
 531
 532 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
 533 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
 534 static int  chars_in_buffer(struct tty_struct *tty);
 535 static void throttle(struct tty_struct * tty);
 536 static void unthrottle(struct tty_struct * tty);
 537 static void set_break(struct tty_struct *tty, int break_state);
 538
 539 #if SYNCLINK_GENERIC_HDLC
 540 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 541 static void hdlcdev_tx_done(SLMP_INFO *info);
 542 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
 543 static int  hdlcdev_init(SLMP_INFO *info);
 544 static void hdlcdev_exit(SLMP_INFO *info);
 545 #endif
 546
 547 /* ioctl handlers */
 548
 549 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
 550 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 551 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 552 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
 553 static int  set_txidle(SLMP_INFO *info, int idle_mode);
 554 static int  tx_enable(SLMP_INFO *info, int enable);
 555 static int  tx_abort(SLMP_INFO *info);
 556 static int  rx_enable(SLMP_INFO *info, int enable);
 557 static int  modem_input_wait(SLMP_INFO *info,int arg);
 558 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
 559 static int  tiocmget(struct tty_struct *tty, struct file *file);
 560 static int  tiocmset(struct tty_struct *tty, struct file *file,
 561                      unsigned int set, unsigned int clear);
 562 static void set_break(struct tty_struct *tty, int break_state);
 563
 564 static void add_device(SLMP_INFO *info);
 565 static void device_init(int adapter_num, struct pci_dev *pdev);
 566 static int  claim_resources(SLMP_INFO *info);
 567 static void release_resources(SLMP_INFO *info);
 568
 569 static int  startup(SLMP_INFO *info);
 570 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
 571 static void shutdown(SLMP_INFO *info);
 572 static void program_hw(SLMP_INFO *info);
 573 static void change_params(SLMP_INFO *info);
 574
 575 static int  init_adapter(SLMP_INFO *info);
 576 static int  register_test(SLMP_INFO *info);
 577 static int  irq_test(SLMP_INFO *info);
 578 static int  loopback_test(SLMP_INFO *info);
 579 static int  adapter_test(SLMP_INFO *info);
 580 static int  memory_test(SLMP_INFO *info);
 581
 582 static void reset_adapter(SLMP_INFO *info);
 583 static void reset_port(SLMP_INFO *info);
 584 static void async_mode(SLMP_INFO *info);
 585 static void hdlc_mode(SLMP_INFO *info);
 586
 587 static void rx_stop(SLMP_INFO *info);
 588 static void rx_start(SLMP_INFO *info);
 589 static void rx_reset_buffers(SLMP_INFO *info);
 590 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
 591 static int  rx_get_frame(SLMP_INFO *info);
 592
 593 static void tx_start(SLMP_INFO *info);
 594 static void tx_stop(SLMP_INFO *info);
 595 static void tx_load_fifo(SLMP_INFO *info);
 596 static void tx_set_idle(SLMP_INFO *info);
 597 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
 598
 599 static void get_signals(SLMP_INFO *info);
 600 static void set_signals(SLMP_INFO *info);
 601 static void enable_loopback(SLMP_INFO *info, int enable);
 602 static void set_rate(SLMP_INFO *info, u32 data_rate);
 603
 604 static int  bh_action(SLMP_INFO *info);
 605 static void bh_handler(struct work_struct *work);
 606 static void bh_receive(SLMP_INFO *info);
 607 static void bh_transmit(SLMP_INFO *info);
 608 static void bh_status(SLMP_INFO *info);
 609 static void isr_timer(SLMP_INFO *info);
 610 static void isr_rxint(SLMP_INFO *info);
 611 static void isr_rxrdy(SLMP_INFO *info);
 612 static void isr_txint(SLMP_INFO *info);
 613 static void isr_txrdy(SLMP_INFO *info);
 614 static void isr_rxdmaok(SLMP_INFO *info);
 615 static void isr_rxdmaerror(SLMP_INFO *info);
 616 static void isr_txdmaok(SLMP_INFO *info);
 617 static void isr_txdmaerror(SLMP_INFO *info);
 618 static void isr_io_pin(SLMP_INFO *info, u16 status);
 619
 620 static int  alloc_dma_bufs(SLMP_INFO *info);
 621 static void free_dma_bufs(SLMP_INFO *info);
 622 static int  alloc_buf_list(SLMP_INFO *info);
 623 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
 624 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
 625 static void free_tmp_rx_buf(SLMP_INFO *info);
 626
 627 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
 628 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
 629 static void tx_timeout(unsigned long context);
 630 static void status_timeout(unsigned long context);
 631
 632 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
 633 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
 634 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
 635 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
 636 static unsigned char read_status_reg(SLMP_INFO * info);
 637 static void write_control_reg(SLMP_INFO * info);
 638
 639
 640 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
 641 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
 642 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
 643
 644 static u32 misc_ctrl_value = 0x007e4040;
 645 static u32 lcr1_brdr_value = 0x00800028;
 646
 647 static u32 read_ahead_count = 8;
 648
 649 /* DPCR, DMA Priority Control
 650  *
 651  * 07..05  Not used, must be 0
 652  * 04      BRC, bus release condition: 0=all transfers complete
 653  *              1=release after 1 xfer on all channels
 654  * 03      CCC, channel change condition: 0=every cycle
 655  *              1=after each channel completes all xfers
 656  * 02..00  PR<2..0>, priority 100=round robin
 657  *
 658  * 00000100 = 0x00
 659  */
 660 static unsigned char dma_priority = 0x04;
 661
 662 // Number of bytes that can be written to shared RAM
 663 // in a single write operation
 664 static u32 sca_pci_load_interval = 64;
 665
 666 /*
 667  * 1st function defined in .text section. Calling this function in
 668  * init_module() followed by a breakpoint allows a remote debugger
 669  * (gdb) to get the .text address for the add-symbol-file command.
 670  * This allows remote debugging of dynamically loadable modules.
 671  */
 672 static void* synclinkmp_get_text_ptr(void);
 673 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
 674
 675 static inline int sanity_check(SLMP_INFO *info,
 676                                char *name, const char *routine)
 677 {
 678 #ifdef SANITY_CHECK
 679         static const char *badmagic =
 680                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
 681         static const char *badinfo =
 682                 "Warning: null synclinkmp_struct for (%s) in %s\n";
 683
 684         if (!info) {
 685                 printk(badinfo, name, routine);
 686                 return 1;
 687         }
 688         if (info->magic != MGSL_MAGIC) {
 689                 printk(badmagic, name, routine);
 690                 return 1;
 691         }
 692 #else
 693         if (!info)
 694                 return 1;
 695 #endif
 696         return 0;
 697 }
 698
 699 /**
 700  * line discipline callback wrappers
 701  *
 702  * The wrappers maintain line discipline references
 703  * while calling into the line discipline.
 704  *
 705  * ldisc_receive_buf  - pass receive data to line discipline
 706  */
 707
 708 static void ldisc_receive_buf(struct tty_struct *tty,
 709                               const __u8 *data, char *flags, int count)
 710 {
 711         struct tty_ldisc *ld;
 712         if (!tty)
 713                 return;
 714         ld = tty_ldisc_ref(tty);
 715         if (ld) {
 716                 if (ld->receive_buf)
 717                         ld->receive_buf(tty, data, flags, count);
 718                 tty_ldisc_deref(ld);
 719         }
 720 }
 721
 722 /* tty callbacks */
 723
 724 /* Called when a port is opened.  Init and enable port.
 725  */
 726 static int open(struct tty_struct *tty, struct file *filp)
 727 {
 728         SLMP_INFO *info;
 729         int retval, line;
 730         unsigned long flags;
 731
 732         line = tty->index;
 733         if ((line < 0) || (line >= synclinkmp_device_count)) {
 734                 printk("%s(%d): open with invalid line #%d.\n",
 735                         __FILE__,__LINE__,line);
 736                 return -ENODEV;
 737         }
 738
 739         info = synclinkmp_device_list;
 740         while(info && info->line != line)
 741                 info = info->next_device;
 742         if (sanity_check(info, tty->name, "open"))
 743                 return -ENODEV;
 744         if ( info->init_error ) {
 745                 printk("%s(%d):%s device is not allocated, init error=%d\n",
 746                         __FILE__,__LINE__,info->device_name,info->init_error);
 747                 return -ENODEV;
 748         }
 749
 750         tty->driver_data = info;
 751         info->tty = tty;
 752
 753         if (debug_level >= DEBUG_LEVEL_INFO)
 754                 printk("%s(%d):%s open(), old ref count = %d\n",
 755                          __FILE__,__LINE__,tty->driver->name, info->count);
 756
 757         /* If port is closing, signal caller to try again */
 758         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
 759                 if (info->flags & ASYNC_CLOSING)
 760                         interruptible_sleep_on(&info->close_wait);
 761                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
 762                         -EAGAIN : -ERESTARTSYS);
 763                 goto cleanup;
 764         }
 765
 766         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 767
 768         spin_lock_irqsave(&info->netlock, flags);
 769         if (info->netcount) {
 770                 retval = -EBUSY;
 771                 spin_unlock_irqrestore(&info->netlock, flags);
 772                 goto cleanup;
 773         }
 774         info->count++;
 775         spin_unlock_irqrestore(&info->netlock, flags);
 776
 777         if (info->count == 1) {
 778                 /* 1st open on this device, init hardware */
 779                 retval = startup(info);
 780                 if (retval < 0)
 781                         goto cleanup;
 782         }
 783
 784         retval = block_til_ready(tty, filp, info);
 785         if (retval) {
 786                 if (debug_level >= DEBUG_LEVEL_INFO)
 787                         printk("%s(%d):%s block_til_ready() returned %d\n",
 788                                  __FILE__,__LINE__, info->device_name, retval);
 789                 goto cleanup;
 790         }
 791
 792         if (debug_level >= DEBUG_LEVEL_INFO)
 793                 printk("%s(%d):%s open() success\n",
 794                          __FILE__,__LINE__, info->device_name);
 795         retval = 0;
 796
 797 cleanup:
 798         if (retval) {
 799                 if (tty->count == 1)
 800                         info->tty = NULL; /* tty layer will release tty struct */
 801                 if(info->count)
 802                         info->count--;
 803         }
 804
 805         return retval;
 806 }
 807
 808 /* Called when port is closed. Wait for remaining data to be
 809  * sent. Disable port and free resources.
 810  */
 811 static void close(struct tty_struct *tty, struct file *filp)
 812 {
 813         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
 814
 815         if (sanity_check(info, tty->name, "close"))
 816                 return;
 817
 818         if (debug_level >= DEBUG_LEVEL_INFO)
 819                 printk("%s(%d):%s close() entry, count=%d\n",
 820                          __FILE__,__LINE__, info->device_name, info->count);
 821
 822         if (!info->count)
 823                 return;
 824
 825         if (tty_hung_up_p(filp))
 826                 goto cleanup;
 827
 828         if ((tty->count == 1) && (info->count != 1)) {
 829                 /*
 830                  * tty->count is 1 and the tty structure will be freed.
 831                  * info->count should be one in this case.
 832                  * if it's not, correct it so that the port is shutdown.
 833                  */
 834                 printk("%s(%d):%s close: bad refcount; tty->count is 1, "
 835                        "info->count is %d\n",
 836                          __FILE__,__LINE__, info->device_name, info->count);
 837                 info->count = 1;
 838         }
 839
 840         info->count--;
 841
 842         /* if at least one open remaining, leave hardware active */
 843         if (info->count)
 844                 goto cleanup;
 845
 846         info->flags |= ASYNC_CLOSING;
 847
 848         /* set tty->closing to notify line discipline to
 849          * only process XON/XOFF characters. Only the N_TTY
 850          * discipline appears to use this (ppp does not).
 851          */
 852         tty->closing = 1;
 853
 854         /* wait for transmit data to clear all layers */
 855
 856         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
 857                 if (debug_level >= DEBUG_LEVEL_INFO)
 858                         printk("%s(%d):%s close() calling tty_wait_until_sent\n",
 859                                  __FILE__,__LINE__, info->device_name );
 860                 tty_wait_until_sent(tty, info->closing_wait);
 861         }
 862
 863         if (info->flags & ASYNC_INITIALIZED)
 864                 wait_until_sent(tty, info->timeout);
 865
 866         if (tty->driver->flush_buffer)
 867                 tty->driver->flush_buffer(tty);
 868
 869         tty_ldisc_flush(tty);
 870
 871         shutdown(info);
 872
 873         tty->closing = 0;
 874         info->tty = NULL;
 875
 876         if (info->blocked_open) {
 877                 if (info->close_delay) {
 878                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
 879                 }
 880                 wake_up_interruptible(&info->open_wait);
 881         }
 882
 883         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 884
 885         wake_up_interruptible(&info->close_wait);
 886
 887 cleanup:
 888         if (debug_level >= DEBUG_LEVEL_INFO)
 889                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
 890                         tty->driver->name, info->count);
 891 }
 892
 893 /* Called by tty_hangup() when a hangup is signaled.
 894  * This is the same as closing all open descriptors for the port.
 895  */
 896 static void hangup(struct tty_struct *tty)
 897 {
 898         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 899
 900         if (debug_level >= DEBUG_LEVEL_INFO)
 901                 printk("%s(%d):%s hangup()\n",
 902                          __FILE__,__LINE__, info->device_name );
 903
 904         if (sanity_check(info, tty->name, "hangup"))
 905                 return;
 906
 907         flush_buffer(tty);
 908         shutdown(info);
 909
 910         info->count = 0;
 911         info->flags &= ~ASYNC_NORMAL_ACTIVE;
 912         info->tty = NULL;
 913
 914         wake_up_interruptible(&info->open_wait);
 915 }
 916
 917 /* Set new termios settings
 918  */
 919 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 920 {
 921         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 922         unsigned long flags;
 923
 924         if (debug_level >= DEBUG_LEVEL_INFO)
 925                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
 926                         tty->driver->name );
 927
 928         change_params(info);
 929
 930         /* Handle transition to B0 status */
 931         if (old_termios->c_cflag & CBAUD &&
 932             !(tty->termios->c_cflag & CBAUD)) {
 933                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
 934                 spin_lock_irqsave(&info->lock,flags);
 935                 set_signals(info);
 936                 spin_unlock_irqrestore(&info->lock,flags);
 937         }
 938
 939         /* Handle transition away from B0 status */
 940         if (!(old_termios->c_cflag & CBAUD) &&
 941             tty->termios->c_cflag & CBAUD) {
 942                 info->serial_signals |= SerialSignal_DTR;
 943                 if (!(tty->termios->c_cflag & CRTSCTS) ||
 944                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 945                         info->serial_signals |= SerialSignal_RTS;
 946                 }
 947                 spin_lock_irqsave(&info->lock,flags);
 948                 set_signals(info);
 949                 spin_unlock_irqrestore(&info->lock,flags);
 950         }
 951
 952         /* Handle turning off CRTSCTS */
 953         if (old_termios->c_cflag & CRTSCTS &&
 954             !(tty->termios->c_cflag & CRTSCTS)) {
 955                 tty->hw_stopped = 0;
 956                 tx_release(tty);
 957         }
 958 }
 959
 960 /* Send a block of data
 961  *
 962  * Arguments:
 963  *
 964  *      tty             pointer to tty information structure
 965  *      buf             pointer to buffer containing send data
 966  *      count           size of send data in bytes
 967  *
 968  * Return Value:        number of characters written
 969  */
 970 static int write(struct tty_struct *tty,
 971                  const unsigned char *buf, int count)
 972 {
 973         int     c, ret = 0;
 974         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 975         unsigned long flags;
 976
 977         if (debug_level >= DEBUG_LEVEL_INFO)
 978                 printk("%s(%d):%s write() count=%d\n",
 979                        __FILE__,__LINE__,info->device_name,count);
 980
 981         if (sanity_check(info, tty->name, "write"))
 982                 goto cleanup;
 983
 984         if (!info->tx_buf)
 985                 goto cleanup;
 986
 987         if (info->params.mode == MGSL_MODE_HDLC) {
 988                 if (count > info->max_frame_size) {
 989                         ret = -EIO;
 990                         goto cleanup;
 991                 }
 992                 if (info->tx_active)
 993                         goto cleanup;
 994                 if (info->tx_count) {
 995                         /* send accumulated data from send_char() calls */
 996                         /* as frame and wait before accepting more data. */
 997                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
 998                         goto start;
 999                 }
1000                 ret = info->tx_count = count;
1001                 tx_load_dma_buffer(info, buf, count);
1002                 goto start;
1003         }
1004
1005         for (;;) {
1006                 c = min_t(int, count,
1007                         min(info->max_frame_size - info->tx_count - 1,
1008                             info->max_frame_size - info->tx_put));
1009                 if (c <= 0)
1010                         break;
1011
1012                 memcpy(info->tx_buf + info->tx_put, buf, c);
1013
1014                 spin_lock_irqsave(&info->lock,flags);
1015                 info->tx_put += c;
1016                 if (info->tx_put >= info->max_frame_size)
1017                         info->tx_put -= info->max_frame_size;
1018                 info->tx_count += c;
1019                 spin_unlock_irqrestore(&info->lock,flags);
1020
1021                 buf += c;
1022                 count -= c;
1023                 ret += c;
1024         }
1025
1026         if (info->params.mode == MGSL_MODE_HDLC) {
1027                 if (count) {
1028                         ret = info->tx_count = 0;
1029                         goto cleanup;
1030                 }
1031                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1032         }
1033 start:
1034         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1035                 spin_lock_irqsave(&info->lock,flags);
1036                 if (!info->tx_active)
1037                         tx_start(info);
1038                 spin_unlock_irqrestore(&info->lock,flags);
1039         }
1040
1041 cleanup:
1042         if (debug_level >= DEBUG_LEVEL_INFO)
1043                 printk( "%s(%d):%s write() returning=%d\n",
1044                         __FILE__,__LINE__,info->device_name,ret);
1045         return ret;
1046 }
1047
1048 /* Add a character to the transmit buffer.
1049  */
1050 static void put_char(struct tty_struct *tty, unsigned char ch)
1051 {
1052         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1053         unsigned long flags;
1054
1055         if ( debug_level >= DEBUG_LEVEL_INFO ) {
1056                 printk( "%s(%d):%s put_char(%d)\n",
1057                         __FILE__,__LINE__,info->device_name,ch);
1058         }
1059
1060         if (sanity_check(info, tty->name, "put_char"))
1061                 return;
1062
1063         if (!info->tx_buf)
1064                 return;
1065
1066         spin_lock_irqsave(&info->lock,flags);
1067
1068         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1069              !info->tx_active ) {
1070
1071                 if (info->tx_count < info->max_frame_size - 1) {
1072                         info->tx_buf[info->tx_put++] = ch;
1073                         if (info->tx_put >= info->max_frame_size)
1074                                 info->tx_put -= info->max_frame_size;
1075                         info->tx_count++;
1076                 }
1077         }
1078
1079         spin_unlock_irqrestore(&info->lock,flags);
1080 }
1081
1082 /* Send a high-priority XON/XOFF character
1083  */
1084 static void send_xchar(struct tty_struct *tty, char ch)
1085 {
1086         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1087         unsigned long flags;
1088
1089         if (debug_level >= DEBUG_LEVEL_INFO)
1090                 printk("%s(%d):%s send_xchar(%d)\n",
1091                          __FILE__,__LINE__, info->device_name, ch );
1092
1093         if (sanity_check(info, tty->name, "send_xchar"))
1094                 return;
1095
1096         info->x_char = ch;
1097         if (ch) {
1098                 /* Make sure transmit interrupts are on */
1099                 spin_lock_irqsave(&info->lock,flags);
1100                 if (!info->tx_enabled)
1101                         tx_start(info);
1102                 spin_unlock_irqrestore(&info->lock,flags);
1103         }
1104 }
1105
1106 /* Wait until the transmitter is empty.
1107  */
1108 static void wait_until_sent(struct tty_struct *tty, int timeout)
1109 {
1110         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1111         unsigned long orig_jiffies, char_time;
1112
1113         if (!info )
1114                 return;
1115
1116         if (debug_level >= DEBUG_LEVEL_INFO)
1117                 printk("%s(%d):%s wait_until_sent() entry\n",
1118                          __FILE__,__LINE__, info->device_name );
1119
1120         if (sanity_check(info, tty->name, "wait_until_sent"))
1121                 return;
1122
1123         if (!(info->flags & ASYNC_INITIALIZED))
1124                 goto exit;
1125
1126         orig_jiffies = jiffies;
1127
1128         /* Set check interval to 1/5 of estimated time to
1129          * send a character, and make it at least 1. The check
1130          * interval should also be less than the timeout.
1131          * Note: use tight timings here to satisfy the NIST-PCTS.
1132          */
1133
1134         if ( info->params.data_rate ) {
1135                 char_time = info->timeout/(32 * 5);
1136                 if (!char_time)
1137                         char_time++;
1138         } else
1139                 char_time = 1;
1140
1141         if (timeout)
1142                 char_time = min_t(unsigned long, char_time, timeout);
1143
1144         if ( info->params.mode == MGSL_MODE_HDLC ) {
1145                 while (info->tx_active) {
1146                         msleep_interruptible(jiffies_to_msecs(char_time));
1147                         if (signal_pending(current))
1148                                 break;
1149                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1150                                 break;
1151                 }
1152         } else {
1153                 //TODO: determine if there is something similar to USC16C32
1154                 //      TXSTATUS_ALL_SENT status
1155                 while ( info->tx_active && info->tx_enabled) {
1156                         msleep_interruptible(jiffies_to_msecs(char_time));
1157                         if (signal_pending(current))
1158                                 break;
1159                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1160                                 break;
1161                 }
1162         }
1163
1164 exit:
1165         if (debug_level >= DEBUG_LEVEL_INFO)
1166                 printk("%s(%d):%s wait_until_sent() exit\n",
1167                          __FILE__,__LINE__, info->device_name );
1168 }
1169
1170 /* Return the count of free bytes in transmit buffer
1171  */
1172 static int write_room(struct tty_struct *tty)
1173 {
1174         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1175         int ret;
1176
1177         if (sanity_check(info, tty->name, "write_room"))
1178                 return 0;
1179
1180         if (info->params.mode == MGSL_MODE_HDLC) {
1181                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1182         } else {
1183                 ret = info->max_frame_size - info->tx_count - 1;
1184                 if (ret < 0)
1185                         ret = 0;
1186         }
1187
1188         if (debug_level >= DEBUG_LEVEL_INFO)
1189                 printk("%s(%d):%s write_room()=%d\n",
1190                        __FILE__, __LINE__, info->device_name, ret);
1191
1192         return ret;
1193 }
1194
1195 /* enable transmitter and send remaining buffered characters
1196  */
1197 static void flush_chars(struct tty_struct *tty)
1198 {
1199         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1200         unsigned long flags;
1201
1202         if ( debug_level >= DEBUG_LEVEL_INFO )
1203                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1204                         __FILE__,__LINE__,info->device_name,info->tx_count);
1205
1206         if (sanity_check(info, tty->name, "flush_chars"))
1207                 return;
1208
1209         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1210             !info->tx_buf)
1211                 return;
1212
1213         if ( debug_level >= DEBUG_LEVEL_INFO )
1214                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1215                         __FILE__,__LINE__,info->device_name );
1216
1217         spin_lock_irqsave(&info->lock,flags);
1218
1219         if (!info->tx_active) {
1220                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1221                         info->tx_count ) {
1222                         /* operating in synchronous (frame oriented) mode */
1223                         /* copy data from circular tx_buf to */
1224                         /* transmit DMA buffer. */
1225                         tx_load_dma_buffer(info,
1226                                  info->tx_buf,info->tx_count);
1227                 }
1228                 tx_start(info);
1229         }
1230
1231         spin_unlock_irqrestore(&info->lock,flags);
1232 }
1233
1234 /* Discard all data in the send buffer
1235  */
1236 static void flush_buffer(struct tty_struct *tty)
1237 {
1238         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1239         unsigned long flags;
1240
1241         if (debug_level >= DEBUG_LEVEL_INFO)
1242                 printk("%s(%d):%s flush_buffer() entry\n",
1243                          __FILE__,__LINE__, info->device_name );
1244
1245         if (sanity_check(info, tty->name, "flush_buffer"))
1246                 return;
1247
1248         spin_lock_irqsave(&info->lock,flags);
1249         info->tx_count = info->tx_put = info->tx_get = 0;
1250         del_timer(&info->tx_timer);
1251         spin_unlock_irqrestore(&info->lock,flags);
1252
1253         tty_wakeup(tty);
1254 }
1255
1256 /* throttle (stop) transmitter
1257  */
1258 static void tx_hold(struct tty_struct *tty)
1259 {
1260         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1261         unsigned long flags;
1262
1263         if (sanity_check(info, tty->name, "tx_hold"))
1264                 return;
1265
1266         if ( debug_level >= DEBUG_LEVEL_INFO )
1267                 printk("%s(%d):%s tx_hold()\n",
1268                         __FILE__,__LINE__,info->device_name);
1269
1270         spin_lock_irqsave(&info->lock,flags);
1271         if (info->tx_enabled)
1272                 tx_stop(info);
1273         spin_unlock_irqrestore(&info->lock,flags);
1274 }
1275
1276 /* release (start) transmitter
1277  */
1278 static void tx_release(struct tty_struct *tty)
1279 {
1280         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1281         unsigned long flags;
1282
1283         if (sanity_check(info, tty->name, "tx_release"))
1284                 return;
1285
1286         if ( debug_level >= DEBUG_LEVEL_INFO )
1287                 printk("%s(%d):%s tx_release()\n",
1288                         __FILE__,__LINE__,info->device_name);
1289
1290         spin_lock_irqsave(&info->lock,flags);
1291         if (!info->tx_enabled)
1292                 tx_start(info);
1293         spin_unlock_irqrestore(&info->lock,flags);
1294 }
1295
1296 /* Service an IOCTL request
1297  *
1298  * Arguments:
1299  *
1300  *      tty     pointer to tty instance data
1301  *      file    pointer to associated file object for device
1302  *      cmd     IOCTL command code
1303  *      arg     command argument/context
1304  *
1305  * Return Value:        0 if success, otherwise error code
1306  */
1307 static int ioctl(struct tty_struct *tty, struct file *file,
1308                  unsigned int cmd, unsigned long arg)
1309 {
1310         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1311         int error;
1312         struct mgsl_icount cnow;        /* kernel counter temps */
1313         struct serial_icounter_struct __user *p_cuser;  /* user space */
1314         unsigned long flags;
1315         void __user *argp = (void __user *)arg;
1316
1317         if (debug_level >= DEBUG_LEVEL_INFO)
1318                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1319                         info->device_name, cmd );
1320
1321         if (sanity_check(info, tty->name, "ioctl"))
1322                 return -ENODEV;
1323
1324         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1325             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1326                 if (tty->flags & (1 << TTY_IO_ERROR))
1327                     return -EIO;
1328         }
1329
1330         switch (cmd) {
1331         case MGSL_IOCGPARAMS:
1332                 return get_params(info, argp);
1333         case MGSL_IOCSPARAMS:
1334                 return set_params(info, argp);
1335         case MGSL_IOCGTXIDLE:
1336                 return get_txidle(info, argp);
1337         case MGSL_IOCSTXIDLE:
1338                 return set_txidle(info, (int)arg);
1339         case MGSL_IOCTXENABLE:
1340                 return tx_enable(info, (int)arg);
1341         case MGSL_IOCRXENABLE:
1342                 return rx_enable(info, (int)arg);
1343         case MGSL_IOCTXABORT:
1344                 return tx_abort(info);
1345         case MGSL_IOCGSTATS:
1346                 return get_stats(info, argp);
1347         case MGSL_IOCWAITEVENT:
1348                 return wait_mgsl_event(info, argp);
1349         case MGSL_IOCLOOPTXDONE:
1350                 return 0; // TODO: Not supported, need to document
1351                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1352                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1353                  */
1354         case TIOCMIWAIT:
1355                 return modem_input_wait(info,(int)arg);
1356
1357                 /*
1358                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1359                  * Return: write counters to the user passed counter struct
1360                  * NB: both 1->0 and 0->1 transitions are counted except for
1361                  *     RI where only 0->1 is counted.
1362                  */
1363         case TIOCGICOUNT:
1364                 spin_lock_irqsave(&info->lock,flags);
1365                 cnow = info->icount;
1366                 spin_unlock_irqrestore(&info->lock,flags);
1367                 p_cuser = argp;
1368                 PUT_USER(error,cnow.cts, &p_cuser->cts);
1369                 if (error) return error;
1370                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
1371                 if (error) return error;
1372                 PUT_USER(error,cnow.rng, &p_cuser->rng);
1373                 if (error) return error;
1374                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
1375                 if (error) return error;
1376                 PUT_USER(error,cnow.rx, &p_cuser->rx);
1377                 if (error) return error;
1378                 PUT_USER(error,cnow.tx, &p_cuser->tx);
1379                 if (error) return error;
1380                 PUT_USER(error,cnow.frame, &p_cuser->frame);
1381                 if (error) return error;
1382                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
1383                 if (error) return error;
1384                 PUT_USER(error,cnow.parity, &p_cuser->parity);
1385                 if (error) return error;
1386                 PUT_USER(error,cnow.brk, &p_cuser->brk);
1387                 if (error) return error;
1388                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
1389                 if (error) return error;
1390                 return 0;
1391         default:
1392                 return -ENOIOCTLCMD;
1393         }
1394         return 0;
1395 }
1396
1397 /*
1398  * /proc fs routines....
1399  */
1400
1401 static inline int line_info(char *buf, SLMP_INFO *info)
1402 {
1403         char    stat_buf[30];
1404         int     ret;
1405         unsigned long flags;
1406
1407         ret = sprintf(buf, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1408                        "\tIRQ=%d MaxFrameSize=%u\n",
1409                 info->device_name,
1410                 info->phys_sca_base,
1411                 info->phys_memory_base,
1412                 info->phys_statctrl_base,
1413                 info->phys_lcr_base,
1414                 info->irq_level,
1415                 info->max_frame_size );
1416
1417         /* output current serial signal states */
1418         spin_lock_irqsave(&info->lock,flags);
1419         get_signals(info);
1420         spin_unlock_irqrestore(&info->lock,flags);
1421
1422         stat_buf[0] = 0;
1423         stat_buf[1] = 0;
1424         if (info->serial_signals & SerialSignal_RTS)
1425                 strcat(stat_buf, "|RTS");
1426         if (info->serial_signals & SerialSignal_CTS)
1427                 strcat(stat_buf, "|CTS");
1428         if (info->serial_signals & SerialSignal_DTR)
1429                 strcat(stat_buf, "|DTR");
1430         if (info->serial_signals & SerialSignal_DSR)
1431                 strcat(stat_buf, "|DSR");
1432         if (info->serial_signals & SerialSignal_DCD)
1433                 strcat(stat_buf, "|CD");
1434         if (info->serial_signals & SerialSignal_RI)
1435                 strcat(stat_buf, "|RI");
1436
1437         if (info->params.mode == MGSL_MODE_HDLC) {
1438                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1439                               info->icount.txok, info->icount.rxok);
1440                 if (info->icount.txunder)
1441                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1442                 if (info->icount.txabort)
1443                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1444                 if (info->icount.rxshort)
1445                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1446                 if (info->icount.rxlong)
1447                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1448                 if (info->icount.rxover)
1449                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1450                 if (info->icount.rxcrc)
1451                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc);
1452         } else {
1453                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1454                               info->icount.tx, info->icount.rx);
1455                 if (info->icount.frame)
1456                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1457                 if (info->icount.parity)
1458                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1459                 if (info->icount.brk)
1460                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1461                 if (info->icount.overrun)
1462                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1463         }
1464
1465         /* Append serial signal status to end */
1466         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1467
1468         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1469          info->tx_active,info->bh_requested,info->bh_running,
1470          info->pending_bh);
1471
1472         return ret;
1473 }
1474
1475 /* Called to print information about devices
1476  */
1477 int read_proc(char *page, char **start, off_t off, int count,
1478               int *eof, void *data)
1479 {
1480         int len = 0, l;
1481         off_t   begin = 0;
1482         SLMP_INFO *info;
1483
1484         len += sprintf(page, "synclinkmp driver:%s\n", driver_version);
1485
1486         info = synclinkmp_device_list;
1487         while( info ) {
1488                 l = line_info(page + len, info);
1489                 len += l;
1490                 if (len+begin > off+count)
1491                         goto done;
1492                 if (len+begin < off) {
1493                         begin += len;
1494                         len = 0;
1495                 }
1496                 info = info->next_device;
1497         }
1498
1499         *eof = 1;
1500 done:
1501         if (off >= len+begin)
1502                 return 0;
1503         *start = page + (off-begin);
1504         return ((count < begin+len-off) ? count : begin+len-off);
1505 }
1506
1507 /* Return the count of bytes in transmit buffer
1508  */
1509 static int chars_in_buffer(struct tty_struct *tty)
1510 {
1511         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1512
1513         if (sanity_check(info, tty->name, "chars_in_buffer"))
1514                 return 0;
1515
1516         if (debug_level >= DEBUG_LEVEL_INFO)
1517                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1518                        __FILE__, __LINE__, info->device_name, info->tx_count);
1519
1520         return info->tx_count;
1521 }
1522
1523 /* Signal remote device to throttle send data (our receive data)
1524  */
1525 static void throttle(struct tty_struct * tty)
1526 {
1527         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1528         unsigned long flags;
1529
1530         if (debug_level >= DEBUG_LEVEL_INFO)
1531                 printk("%s(%d):%s throttle() entry\n",
1532                          __FILE__,__LINE__, info->device_name );
1533
1534         if (sanity_check(info, tty->name, "throttle"))
1535                 return;
1536
1537         if (I_IXOFF(tty))
1538                 send_xchar(tty, STOP_CHAR(tty));
1539
1540         if (tty->termios->c_cflag & CRTSCTS) {
1541                 spin_lock_irqsave(&info->lock,flags);
1542                 info->serial_signals &= ~SerialSignal_RTS;
1543                 set_signals(info);
1544                 spin_unlock_irqrestore(&info->lock,flags);
1545         }
1546 }
1547
1548 /* Signal remote device to stop throttling send data (our receive data)
1549  */
1550 static void unthrottle(struct tty_struct * tty)
1551 {
1552         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1553         unsigned long flags;
1554
1555         if (debug_level >= DEBUG_LEVEL_INFO)
1556                 printk("%s(%d):%s unthrottle() entry\n",
1557                          __FILE__,__LINE__, info->device_name );
1558
1559         if (sanity_check(info, tty->name, "unthrottle"))
1560                 return;
1561
1562         if (I_IXOFF(tty)) {
1563                 if (info->x_char)
1564                         info->x_char = 0;
1565                 else
1566                         send_xchar(tty, START_CHAR(tty));
1567         }
1568
1569         if (tty->termios->c_cflag & CRTSCTS) {
1570                 spin_lock_irqsave(&info->lock,flags);
1571                 info->serial_signals |= SerialSignal_RTS;
1572                 set_signals(info);
1573                 spin_unlock_irqrestore(&info->lock,flags);
1574         }
1575 }
1576
1577 /* set or clear transmit break condition
1578  * break_state  -1=set break condition, 0=clear
1579  */
1580 static void set_break(struct tty_struct *tty, int break_state)
1581 {
1582         unsigned char RegValue;
1583         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1584         unsigned long flags;
1585
1586         if (debug_level >= DEBUG_LEVEL_INFO)
1587                 printk("%s(%d):%s set_break(%d)\n",
1588                          __FILE__,__LINE__, info->device_name, break_state);
1589
1590         if (sanity_check(info, tty->name, "set_break"))
1591                 return;
1592
1593         spin_lock_irqsave(&info->lock,flags);
1594         RegValue = read_reg(info, CTL);
1595         if (break_state == -1)
1596                 RegValue |= BIT3;
1597         else
1598                 RegValue &= ~BIT3;
1599         write_reg(info, CTL, RegValue);
1600         spin_unlock_irqrestore(&info->lock,flags);
1601 }
1602
1603 #if SYNCLINK_GENERIC_HDLC
1604
1605 /**
1606  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1607  * set encoding and frame check sequence (FCS) options
1608  *
1609  * dev       pointer to network device structure
1610  * encoding  serial encoding setting
1611  * parity    FCS setting
1612  *
1613  * returns 0 if success, otherwise error code
1614  */
1615 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1616                           unsigned short parity)
1617 {
1618         SLMP_INFO *info = dev_to_port(dev);
1619         unsigned char  new_encoding;
1620         unsigned short new_crctype;
1621
1622         /* return error if TTY interface open */
1623         if (info->count)
1624                 return -EBUSY;
1625
1626         switch (encoding)
1627         {
1628         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1629         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1630         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1631         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1632         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1633         default: return -EINVAL;
1634         }
1635
1636         switch (parity)
1637         {
1638         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1639         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1640         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1641         default: return -EINVAL;
1642         }
1643
1644         info->params.encoding = new_encoding;
1645         info->params.crc_type = new_crctype;
1646
1647         /* if network interface up, reprogram hardware */
1648         if (info->netcount)
1649                 program_hw(info);
1650
1651         return 0;
1652 }
1653
1654 /**
1655  * called by generic HDLC layer to send frame
1656  *
1657  * skb  socket buffer containing HDLC frame
1658  * dev  pointer to network device structure
1659  *
1660  * returns 0 if success, otherwise error code
1661  */
1662 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1663 {
1664         SLMP_INFO *info = dev_to_port(dev);
1665         struct net_device_stats *stats = hdlc_stats(dev);
1666         unsigned long flags;
1667
1668         if (debug_level >= DEBUG_LEVEL_INFO)
1669                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1670
1671         /* stop sending until this frame completes */
1672         netif_stop_queue(dev);
1673
1674         /* copy data to device buffers */
1675         info->tx_count = skb->len;
1676         tx_load_dma_buffer(info, skb->data, skb->len);
1677
1678         /* update network statistics */
1679         stats->tx_packets++;
1680         stats->tx_bytes += skb->len;
1681
1682         /* done with socket buffer, so free it */
1683         dev_kfree_skb(skb);
1684
1685         /* save start time for transmit timeout detection */
1686         dev->trans_start = jiffies;
1687
1688         /* start hardware transmitter if necessary */
1689         spin_lock_irqsave(&info->lock,flags);
1690         if (!info->tx_active)
1691                 tx_start(info);
1692         spin_unlock_irqrestore(&info->lock,flags);
1693
1694         return 0;
1695 }
1696
1697 /**
1698  * called by network layer when interface enabled
1699  * claim resources and initialize hardware
1700  *
1701  * dev  pointer to network device structure
1702  *
1703  * returns 0 if success, otherwise error code
1704  */
1705 static int hdlcdev_open(struct net_device *dev)
1706 {
1707         SLMP_INFO *info = dev_to_port(dev);
1708         int rc;
1709         unsigned long flags;
1710
1711         if (debug_level >= DEBUG_LEVEL_INFO)
1712                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1713
1714         /* generic HDLC layer open processing */
1715         if ((rc = hdlc_open(dev)))
1716                 return rc;
1717
1718         /* arbitrate between network and tty opens */
1719         spin_lock_irqsave(&info->netlock, flags);
1720         if (info->count != 0 || info->netcount != 0) {
1721                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1722                 spin_unlock_irqrestore(&info->netlock, flags);
1723                 return -EBUSY;
1724         }
1725         info->netcount=1;
1726         spin_unlock_irqrestore(&info->netlock, flags);
1727
1728         /* claim resources and init adapter */
1729         if ((rc = startup(info)) != 0) {
1730                 spin_lock_irqsave(&info->netlock, flags);
1731                 info->netcount=0;
1732                 spin_unlock_irqrestore(&info->netlock, flags);
1733                 return rc;
1734         }
1735
1736         /* assert DTR and RTS, apply hardware settings */
1737         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1738         program_hw(info);
1739
1740         /* enable network layer transmit */
1741         dev->trans_start = jiffies;
1742         netif_start_queue(dev);
1743
1744         /* inform generic HDLC layer of current DCD status */
1745         spin_lock_irqsave(&info->lock, flags);
1746         get_signals(info);
1747         spin_unlock_irqrestore(&info->lock, flags);
1748         if (info->serial_signals & SerialSignal_DCD)
1749                 netif_carrier_on(dev);
1750         else
1751                 netif_carrier_off(dev);
1752         return 0;
1753 }
1754
1755 /**
1756  * called by network layer when interface is disabled
1757  * shutdown hardware and release resources
1758  *
1759  * dev  pointer to network device structure
1760  *
1761  * returns 0 if success, otherwise error code
1762  */
1763 static int hdlcdev_close(struct net_device *dev)
1764 {
1765         SLMP_INFO *info = dev_to_port(dev);
1766         unsigned long flags;
1767
1768         if (debug_level >= DEBUG_LEVEL_INFO)
1769                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1770
1771         netif_stop_queue(dev);
1772
1773         /* shutdown adapter and release resources */
1774         shutdown(info);
1775
1776         hdlc_close(dev);
1777
1778         spin_lock_irqsave(&info->netlock, flags);
1779         info->netcount=0;
1780         spin_unlock_irqrestore(&info->netlock, flags);
1781
1782         return 0;
1783 }
1784
1785 /**
1786  * called by network layer to process IOCTL call to network device
1787  *
1788  * dev  pointer to network device structure
1789  * ifr  pointer to network interface request structure
1790  * cmd  IOCTL command code
1791  *
1792  * returns 0 if success, otherwise error code
1793  */
1794 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1795 {
1796         const size_t size = sizeof(sync_serial_settings);
1797         sync_serial_settings new_line;
1798         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1799         SLMP_INFO *info = dev_to_port(dev);
1800         unsigned int flags;
1801
1802         if (debug_level >= DEBUG_LEVEL_INFO)
1803                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1804
1805         /* return error if TTY interface open */
1806         if (info->count)
1807                 return -EBUSY;
1808
1809         if (cmd != SIOCWANDEV)
1810                 return hdlc_ioctl(dev, ifr, cmd);
1811
1812         switch(ifr->ifr_settings.type) {
1813         case IF_GET_IFACE: /* return current sync_serial_settings */
1814
1815                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1816                 if (ifr->ifr_settings.size < size) {
1817                         ifr->ifr_settings.size = size; /* data size wanted */
1818                         return -ENOBUFS;
1819                 }
1820
1821                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1822                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1823                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1824                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1825
1826                 switch (flags){
1827                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1828                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1829                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1830                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1831                 default: new_line.clock_type = CLOCK_DEFAULT;
1832                 }
1833
1834                 new_line.clock_rate = info->params.clock_speed;
1835                 new_line.loopback   = info->params.loopback ? 1:0;
1836
1837                 if (copy_to_user(line, &new_line, size))
1838                         return -EFAULT;
1839                 return 0;
1840
1841         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1842
1843                 if(!capable(CAP_NET_ADMIN))
1844                         return -EPERM;
1845                 if (copy_from_user(&new_line, line, size))
1846                         return -EFAULT;
1847
1848                 switch (new_line.clock_type)
1849                 {
1850                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1851                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1852                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1853                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1854                 case CLOCK_DEFAULT:  flags = info->params.flags &
1855                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1856                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1857                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1858                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1859                 default: return -EINVAL;
1860                 }
1861
1862                 if (new_line.loopback != 0 && new_line.loopback != 1)
1863                         return -EINVAL;
1864
1865                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1866                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1867                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1868                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1869                 info->params.flags |= flags;
1870
1871                 info->params.loopback = new_line.loopback;
1872
1873                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1874                         info->params.clock_speed = new_line.clock_rate;
1875                 else
1876                         info->params.clock_speed = 0;
1877
1878                 /* if network interface up, reprogram hardware */
1879                 if (info->netcount)
1880                         program_hw(info);
1881                 return 0;
1882
1883         default:
1884                 return hdlc_ioctl(dev, ifr, cmd);
1885         }
1886 }
1887
1888 /**
1889  * called by network layer when transmit timeout is detected
1890  *
1891  * dev  pointer to network device structure
1892  */
1893 static void hdlcdev_tx_timeout(struct net_device *dev)
1894 {
1895         SLMP_INFO *info = dev_to_port(dev);
1896         struct net_device_stats *stats = hdlc_stats(dev);
1897         unsigned long flags;
1898
1899         if (debug_level >= DEBUG_LEVEL_INFO)
1900                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1901
1902         stats->tx_errors++;
1903         stats->tx_aborted_errors++;
1904
1905         spin_lock_irqsave(&info->lock,flags);
1906         tx_stop(info);
1907         spin_unlock_irqrestore(&info->lock,flags);
1908
1909         netif_wake_queue(dev);
1910 }
1911
1912 /**
1913  * called by device driver when transmit completes
1914  * reenable network layer transmit if stopped
1915  *
1916  * info  pointer to device instance information
1917  */
1918 static void hdlcdev_tx_done(SLMP_INFO *info)
1919 {
1920         if (netif_queue_stopped(info->netdev))
1921                 netif_wake_queue(info->netdev);
1922 }
1923
1924 /**
1925  * called by device driver when frame received
1926  * pass frame to network layer
1927  *
1928  * info  pointer to device instance information
1929  * buf   pointer to buffer contianing frame data
1930  * size  count of data bytes in buf
1931  */
1932 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1933 {
1934         struct sk_buff *skb = dev_alloc_skb(size);
1935         struct net_device *dev = info->netdev;
1936         struct net_device_stats *stats = hdlc_stats(dev);
1937
1938         if (debug_level >= DEBUG_LEVEL_INFO)
1939                 printk("hdlcdev_rx(%s)\n",dev->name);
1940
1941         if (skb == NULL) {
1942                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
1943                 stats->rx_dropped++;
1944                 return;
1945         }
1946
1947         memcpy(skb_put(skb, size),buf,size);
1948
1949         skb->protocol = hdlc_type_trans(skb, info->netdev);
1950
1951         stats->rx_packets++;
1952         stats->rx_bytes += size;
1953
1954         netif_rx(skb);
1955
1956         info->netdev->last_rx = jiffies;
1957 }
1958
1959 /**
1960  * called by device driver when adding device instance
1961  * do generic HDLC initialization
1962  *
1963  * info  pointer to device instance information
1964  *
1965  * returns 0 if success, otherwise error code
1966  */
1967 static int hdlcdev_init(SLMP_INFO *info)
1968 {
1969         int rc;
1970         struct net_device *dev;
1971         hdlc_device *hdlc;
1972
1973         /* allocate and initialize network and HDLC layer objects */
1974
1975         if (!(dev = alloc_hdlcdev(info))) {
1976                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1977                 return -ENOMEM;
1978         }
1979
1980         /* for network layer reporting purposes only */
1981         dev->mem_start = info->phys_sca_base;
1982         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1983         dev->irq       = info->irq_level;
1984
1985         /* network layer callbacks and settings */
1986         dev->do_ioctl       = hdlcdev_ioctl;
1987         dev->open           = hdlcdev_open;
1988         dev->stop           = hdlcdev_close;
1989         dev->tx_timeout     = hdlcdev_tx_timeout;
1990         dev->watchdog_timeo = 10*HZ;
1991         dev->tx_queue_len   = 50;
1992
1993         /* generic HDLC layer callbacks and settings */
1994         hdlc         = dev_to_hdlc(dev);
1995         hdlc->attach = hdlcdev_attach;
1996         hdlc->xmit   = hdlcdev_xmit;
1997
1998         /* register objects with HDLC layer */
1999         if ((rc = register_hdlc_device(dev))) {
2000                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
2001                 free_netdev(dev);
2002                 return rc;
2003         }
2004
2005         info->netdev = dev;
2006         return 0;
2007 }
2008
2009 /**
2010  * called by device driver when removing device instance
2011  * do generic HDLC cleanup
2012  *
2013  * info  pointer to device instance information
2014  */
2015 static void hdlcdev_exit(SLMP_INFO *info)
2016 {
2017         unregister_hdlc_device(info->netdev);
2018         free_netdev(info->netdev);
2019         info->netdev = NULL;
2020 }
2021
2022 #endif /* CONFIG_HDLC */
2023
2024
2025 /* Return next bottom half action to perform.
2026  * Return Value:        BH action code or 0 if nothing to do.
2027  */
2028 int bh_action(SLMP_INFO *info)
2029 {
2030         unsigned long flags;
2031         int rc = 0;
2032
2033         spin_lock_irqsave(&info->lock,flags);
2034
2035         if (info->pending_bh & BH_RECEIVE) {
2036                 info->pending_bh &= ~BH_RECEIVE;
2037                 rc = BH_RECEIVE;
2038         } else if (info->pending_bh & BH_TRANSMIT) {
2039                 info->pending_bh &= ~BH_TRANSMIT;
2040                 rc = BH_TRANSMIT;
2041         } else if (info->pending_bh & BH_STATUS) {
2042                 info->pending_bh &= ~BH_STATUS;
2043                 rc = BH_STATUS;
2044         }
2045
2046         if (!rc) {
2047                 /* Mark BH routine as complete */
2048                 info->bh_running   = 0;
2049                 info->bh_requested = 0;
2050         }
2051
2052         spin_unlock_irqrestore(&info->lock,flags);
2053
2054         return rc;
2055 }
2056
2057 /* Perform bottom half processing of work items queued by ISR.
2058  */
2059 void bh_handler(struct work_struct *work)
2060 {
2061         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2062         int action;
2063
2064         if (!info)
2065                 return;
2066
2067         if ( debug_level >= DEBUG_LEVEL_BH )
2068                 printk( "%s(%d):%s bh_handler() entry\n",
2069                         __FILE__,__LINE__,info->device_name);
2070
2071         info->bh_running = 1;
2072
2073         while((action = bh_action(info)) != 0) {
2074
2075                 /* Process work item */
2076                 if ( debug_level >= DEBUG_LEVEL_BH )
2077                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2078                                 __FILE__,__LINE__,info->device_name, action);
2079
2080                 switch (action) {
2081
2082                 case BH_RECEIVE:
2083                         bh_receive(info);
2084                         break;
2085                 case BH_TRANSMIT:
2086                         bh_transmit(info);
2087                         break;
2088                 case BH_STATUS:
2089                         bh_status(info);
2090                         break;
2091                 default:
2092                         /* unknown work item ID */
2093                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2094                                 __FILE__,__LINE__,info->device_name,action);
2095                         break;
2096                 }
2097         }
2098
2099         if ( debug_level >= DEBUG_LEVEL_BH )
2100                 printk( "%s(%d):%s bh_handler() exit\n",
2101                         __FILE__,__LINE__,info->device_name);
2102 }
2103
2104 void bh_receive(SLMP_INFO *info)
2105 {
2106         if ( debug_level >= DEBUG_LEVEL_BH )
2107                 printk( "%s(%d):%s bh_receive()\n",
2108                         __FILE__,__LINE__,info->device_name);
2109
2110         while( rx_get_frame(info) );
2111 }
2112
2113 void bh_transmit(SLMP_INFO *info)
2114 {
2115         struct tty_struct *tty = info->tty;
2116
2117         if ( debug_level >= DEBUG_LEVEL_BH )
2118                 printk( "%s(%d):%s bh_transmit() entry\n",
2119                         __FILE__,__LINE__,info->device_name);
2120
2121         if (tty)
2122                 tty_wakeup(tty);
2123 }
2124
2125 void bh_status(SLMP_INFO *info)
2126 {
2127         if ( debug_level >= DEBUG_LEVEL_BH )
2128                 printk( "%s(%d):%s bh_status() entry\n",
2129                         __FILE__,__LINE__,info->device_name);
2130
2131         info->ri_chkcount = 0;
2132         info->dsr_chkcount = 0;
2133         info->dcd_chkcount = 0;
2134         info->cts_chkcount = 0;
2135 }
2136
2137 void isr_timer(SLMP_INFO * info)
2138 {
2139         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2140
2141         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2142         write_reg(info, IER2, 0);
2143
2144         /* TMCS, Timer Control/Status Register
2145          *
2146          * 07      CMF, Compare match flag (read only) 1=match
2147          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2148          * 05      Reserved, must be 0
2149          * 04      TME, Timer Enable
2150          * 03..00  Reserved, must be 0
2151          *
2152          * 0000 0000
2153          */
2154         write_reg(info, (unsigned char)(timer + TMCS), 0);
2155
2156         info->irq_occurred = TRUE;
2157
2158         if ( debug_level >= DEBUG_LEVEL_ISR )
2159                 printk("%s(%d):%s isr_timer()\n",
2160                         __FILE__,__LINE__,info->device_name);
2161 }
2162
2163 void isr_rxint(SLMP_INFO * info)
2164 {
2165         struct tty_struct *tty = info->tty;
2166         struct  mgsl_icount *icount = &info->icount;
2167         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2168         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2169
2170         /* clear status bits */
2171         if (status)
2172                 write_reg(info, SR1, status);
2173
2174         if (status2)
2175                 write_reg(info, SR2, status2);
2176
2177         if ( debug_level >= DEBUG_LEVEL_ISR )
2178                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2179                         __FILE__,__LINE__,info->device_name,status,status2);
2180
2181         if (info->params.mode == MGSL_MODE_ASYNC) {
2182                 if (status & BRKD) {
2183                         icount->brk++;
2184
2185                         /* process break detection if tty control
2186                          * is not set to ignore it
2187                          */
2188                         if ( tty ) {
2189                                 if (!(status & info->ignore_status_mask1)) {
2190                                         if (info->read_status_mask1 & BRKD) {
2191                                                 tty_insert_flip_char(tty, 0, TTY_BREAK);
2192                                                 if (info->flags & ASYNC_SAK)
2193                                                         do_SAK(tty);
2194                                         }
2195                                 }
2196                         }
2197                 }
2198         }
2199         else {
2200                 if (status & (FLGD|IDLD)) {
2201                         if (status & FLGD)
2202                                 info->icount.exithunt++;
2203                         else if (status & IDLD)
2204                                 info->icount.rxidle++;
2205                         wake_up_interruptible(&info->event_wait_q);
2206                 }
2207         }
2208
2209         if (status & CDCD) {
2210                 /* simulate a common modem status change interrupt
2211                  * for our handler
2212                  */
2213                 get_signals( info );
2214                 isr_io_pin(info,
2215                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2216         }
2217 }
2218
2219 /*
2220  * handle async rx data interrupts
2221  */
2222 void isr_rxrdy(SLMP_INFO * info)
2223 {
2224         u16 status;
2225         unsigned char DataByte;
2226         struct tty_struct *tty = info->tty;
2227         struct  mgsl_icount *icount = &info->icount;
2228
2229         if ( debug_level >= DEBUG_LEVEL_ISR )
2230                 printk("%s(%d):%s isr_rxrdy\n",
2231                         __FILE__,__LINE__,info->device_name);
2232
2233         while((status = read_reg(info,CST0)) & BIT0)
2234         {
2235                 int flag = 0;
2236                 int over = 0;
2237                 DataByte = read_reg(info,TRB);
2238
2239                 icount->rx++;
2240
2241                 if ( status & (PE + FRME + OVRN) ) {
2242                         printk("%s(%d):%s rxerr=%04X\n",
2243                                 __FILE__,__LINE__,info->device_name,status);
2244
2245                         /* update error statistics */
2246                         if (status & PE)
2247                                 icount->parity++;
2248                         else if (status & FRME)
2249                                 icount->frame++;
2250                         else if (status & OVRN)
2251                                 icount->overrun++;
2252
2253                         /* discard char if tty control flags say so */
2254                         if (status & info->ignore_status_mask2)
2255                                 continue;
2256
2257                         status &= info->read_status_mask2;
2258
2259                         if ( tty ) {
2260                                 if (status & PE)
2261                                         flag = TTY_PARITY;
2262                                 else if (status & FRME)
2263                                         flag = TTY_FRAME;
2264                                 if (status & OVRN) {
2265                                         /* Overrun is special, since it's
2266                                          * reported immediately, and doesn't
2267                                          * affect the current character
2268                                          */
2269                                         over = 1;
2270                                 }
2271                         }
2272                 }       /* end of if (error) */
2273
2274                 if ( tty ) {
2275                         tty_insert_flip_char(tty, DataByte, flag);
2276                         if (over)
2277                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2278                 }
2279         }
2280
2281         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2282                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2283                         __FILE__,__LINE__,info->device_name,
2284                         icount->rx,icount->brk,icount->parity,
2285                         icount->frame,icount->overrun);
2286         }
2287
2288         if ( tty )
2289                 tty_flip_buffer_push(tty);
2290 }
2291
2292 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2293 {
2294         if ( debug_level >= DEBUG_LEVEL_ISR )
2295                 printk("%s(%d):%s isr_txeom status=%02x\n",
2296                         __FILE__,__LINE__,info->device_name,status);
2297
2298         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2299         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2300         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2301
2302         if (status & UDRN) {
2303                 write_reg(info, CMD, TXRESET);
2304                 write_reg(info, CMD, TXENABLE);
2305         } else
2306                 write_reg(info, CMD, TXBUFCLR);
2307
2308         /* disable and clear tx interrupts */
2309         info->ie0_value &= ~TXRDYE;
2310         info->ie1_value &= ~(IDLE + UDRN);
2311         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2312         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2313
2314         if ( info->tx_active ) {
2315                 if (info->params.mode != MGSL_MODE_ASYNC) {
2316                         if (status & UDRN)
2317                                 info->icount.txunder++;
2318                         else if (status & IDLE)
2319                                 info->icount.txok++;
2320                 }
2321
2322                 info->tx_active = 0;
2323                 info->tx_count = info->tx_put = info->tx_get = 0;
2324
2325                 del_timer(&info->tx_timer);
2326
2327                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2328                         info->serial_signals &= ~SerialSignal_RTS;
2329                         info->drop_rts_on_tx_done = 0;
2330                         set_signals(info);
2331                 }
2332
2333 #if SYNCLINK_GENERIC_HDLC
2334                 if (info->netcount)
2335                         hdlcdev_tx_done(info);
2336                 else
2337 #endif
2338                 {
2339                         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2340                                 tx_stop(info);
2341                                 return;
2342                         }
2343                         info->pending_bh |= BH_TRANSMIT;
2344                 }
2345         }
2346 }
2347
2348
2349 /*
2350  * handle tx status interrupts
2351  */
2352 void isr_txint(SLMP_INFO * info)
2353 {
2354         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2355
2356         /* clear status bits */
2357         write_reg(info, SR1, status);
2358
2359         if ( debug_level >= DEBUG_LEVEL_ISR )
2360                 printk("%s(%d):%s isr_txint status=%02x\n",
2361                         __FILE__,__LINE__,info->device_name,status);
2362
2363         if (status & (UDRN + IDLE))
2364                 isr_txeom(info, status);
2365
2366         if (status & CCTS) {
2367                 /* simulate a common modem status change interrupt
2368                  * for our handler
2369                  */
2370                 get_signals( info );
2371                 isr_io_pin(info,
2372                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2373
2374         }
2375 }
2376
2377 /*
2378  * handle async tx data interrupts
2379  */
2380 void isr_txrdy(SLMP_INFO * info)
2381 {
2382         if ( debug_level >= DEBUG_LEVEL_ISR )
2383                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2384                         __FILE__,__LINE__,info->device_name,info->tx_count);
2385
2386         if (info->params.mode != MGSL_MODE_ASYNC) {
2387                 /* disable TXRDY IRQ, enable IDLE IRQ */
2388                 info->ie0_value &= ~TXRDYE;
2389                 info->ie1_value |= IDLE;
2390                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2391                 return;
2392         }
2393
2394         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2395                 tx_stop(info);
2396                 return;
2397         }
2398
2399         if ( info->tx_count )
2400                 tx_load_fifo( info );
2401         else {
2402                 info->tx_active = 0;
2403                 info->ie0_value &= ~TXRDYE;
2404                 write_reg(info, IE0, info->ie0_value);
2405         }
2406
2407         if (info->tx_count < WAKEUP_CHARS)
2408                 info->pending_bh |= BH_TRANSMIT;
2409 }
2410
2411 void isr_rxdmaok(SLMP_INFO * info)
2412 {
2413         /* BIT7 = EOT (end of transfer)
2414          * BIT6 = EOM (end of message/frame)
2415          */
2416         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2417
2418         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2419         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2420
2421         if ( debug_level >= DEBUG_LEVEL_ISR )
2422                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2423                         __FILE__,__LINE__,info->device_name,status);
2424
2425         info->pending_bh |= BH_RECEIVE;
2426 }
2427
2428 void isr_rxdmaerror(SLMP_INFO * info)
2429 {
2430         /* BIT5 = BOF (buffer overflow)
2431          * BIT4 = COF (counter overflow)
2432          */
2433         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2434
2435         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2436         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2437
2438         if ( debug_level >= DEBUG_LEVEL_ISR )
2439                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2440                         __FILE__,__LINE__,info->device_name,status);
2441
2442         info->rx_overflow = TRUE;
2443         info->pending_bh |= BH_RECEIVE;
2444 }
2445
2446 void isr_txdmaok(SLMP_INFO * info)
2447 {
2448         unsigned char status_reg1 = read_reg(info, SR1);
2449
2450         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2451         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2452         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2453
2454         if ( debug_level >= DEBUG_LEVEL_ISR )
2455                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2456                         __FILE__,__LINE__,info->device_name,status_reg1);
2457
2458         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2459         write_reg16(info, TRC0, 0);
2460         info->ie0_value |= TXRDYE;
2461         write_reg(info, IE0, info->ie0_value);
2462 }
2463
2464 void isr_txdmaerror(SLMP_INFO * info)
2465 {
2466         /* BIT5 = BOF (buffer overflow)
2467          * BIT4 = COF (counter overflow)
2468          */
2469         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2470
2471         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2472         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2473
2474         if ( debug_level >= DEBUG_LEVEL_ISR )
2475                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2476                         __FILE__,__LINE__,info->device_name,status);
2477 }
2478
2479 /* handle input serial signal changes
2480  */
2481 void isr_io_pin( SLMP_INFO *info, u16 status )
2482 {
2483         struct  mgsl_icount *icount;
2484
2485         if ( debug_level >= DEBUG_LEVEL_ISR )
2486                 printk("%s(%d):isr_io_pin status=%04X\n",
2487                         __FILE__,__LINE__,status);
2488
2489         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2490                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2491                 icount = &info->icount;
2492                 /* update input line counters */
2493                 if (status & MISCSTATUS_RI_LATCHED) {
2494                         icount->rng++;
2495                         if ( status & SerialSignal_RI )
2496                                 info->input_signal_events.ri_up++;
2497                         else
2498                                 info->input_signal_events.ri_down++;
2499                 }
2500                 if (status & MISCSTATUS_DSR_LATCHED) {
2501                         icount->dsr++;
2502                         if ( status & SerialSignal_DSR )
2503                                 info->input_signal_events.dsr_up++;
2504                         else
2505                                 info->input_signal_events.dsr_down++;
2506                 }
2507                 if (status & MISCSTATUS_DCD_LATCHED) {
2508                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2509                                 info->ie1_value &= ~CDCD;
2510                                 write_reg(info, IE1, info->ie1_value);
2511                         }
2512                         icount->dcd++;
2513                         if (status & SerialSignal_DCD) {
2514                                 info->input_signal_events.dcd_up++;
2515                         } else
2516                                 info->input_signal_events.dcd_down++;
2517 #if SYNCLINK_GENERIC_HDLC
2518                         if (info->netcount) {
2519                                 if (status & SerialSignal_DCD)
2520                                         netif_carrier_on(info->netdev);
2521                                 else
2522                                         netif_carrier_off(info->netdev);
2523                         }
2524 #endif
2525                 }
2526                 if (status & MISCSTATUS_CTS_LATCHED)
2527                 {
2528                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2529                                 info->ie1_value &= ~CCTS;
2530                                 write_reg(info, IE1, info->ie1_value);
2531                         }
2532                         icount->cts++;
2533                         if ( status & SerialSignal_CTS )
2534                                 info->input_signal_events.cts_up++;
2535                         else
2536                                 info->input_signal_events.cts_down++;
2537                 }
2538                 wake_up_interruptible(&info->status_event_wait_q);
2539                 wake_up_interruptible(&info->event_wait_q);
2540
2541                 if ( (info->flags & ASYNC_CHECK_CD) &&
2542                      (status & MISCSTATUS_DCD_LATCHED) ) {
2543                         if ( debug_level >= DEBUG_LEVEL_ISR )
2544                                 printk("%s CD now %s...", info->device_name,
2545                                        (status & SerialSignal_DCD) ? "on" : "off");
2546                         if (status & SerialSignal_DCD)
2547                                 wake_up_interruptible(&info->open_wait);
2548                         else {
2549                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2550                                         printk("doing serial hangup...");
2551                                 if (info->tty)
2552                                         tty_hangup(info->tty);
2553                         }
2554                 }
2555
2556                 if ( (info->flags & ASYNC_CTS_FLOW) &&
2557                      (status & MISCSTATUS_CTS_LATCHED) ) {
2558                         if ( info->tty ) {
2559                                 if (info->tty->hw_stopped) {
2560                                         if (status & SerialSignal_CTS) {
2561                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2562                                                         printk("CTS tx start...");
2563                                                 info->tty->hw_stopped = 0;
2564                                                 tx_start(info);
2565                                                 info->pending_bh |= BH_TRANSMIT;
2566                                                 return;
2567                                         }
2568                                 } else {
2569                                         if (!(status & SerialSignal_CTS)) {
2570                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2571                                                         printk("CTS tx stop...");
2572                                                 info->tty->hw_stopped = 1;
2573                                                 tx_stop(info);
2574                                         }
2575                                 }
2576                         }
2577                 }
2578         }
2579
2580         info->pending_bh |= BH_STATUS;
2581 }
2582
2583 /* Interrupt service routine entry point.
2584  *
2585  * Arguments:
2586  *      irq             interrupt number that caused interrupt
2587  *      dev_id          device ID supplied during interrupt registration
2588  *      regs            interrupted processor context
2589  */
2590 static irqreturn_t synclinkmp_interrupt(int irq, void *dev_id)
2591 {
2592         SLMP_INFO * info;
2593         unsigned char status, status0, status1=0;
2594         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2595         unsigned char timerstatus0, timerstatus1=0;
2596         unsigned char shift;
2597         unsigned int i;
2598         unsigned short tmp;
2599
2600         if ( debug_level >= DEBUG_LEVEL_ISR )
2601                 printk("%s(%d): synclinkmp_interrupt(%d)entry.\n",
2602                         __FILE__,__LINE__,irq);
2603
2604         info = (SLMP_INFO *)dev_id;
2605         if (!info)
2606                 return IRQ_NONE;
2607
2608         spin_lock(&info->lock);
2609
2610         for(;;) {
2611
2612                 /* get status for SCA0 (ports 0-1) */
2613                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2614                 status0 = (unsigned char)tmp;
2615                 dmastatus0 = (unsigned char)(tmp>>8);
2616                 timerstatus0 = read_reg(info, ISR2);
2617
2618                 if ( debug_level >= DEBUG_LEVEL_ISR )
2619                         printk("%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2620                                 __FILE__,__LINE__,info->device_name,
2621                                 status0,dmastatus0,timerstatus0);
2622
2623                 if (info->port_count == 4) {
2624                         /* get status for SCA1 (ports 2-3) */
2625                         tmp = read_reg16(info->port_array[2], ISR0);
2626                         status1 = (unsigned char)tmp;
2627                         dmastatus1 = (unsigned char)(tmp>>8);
2628                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2629
2630                         if ( debug_level >= DEBUG_LEVEL_ISR )
2631                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2632                                         __FILE__,__LINE__,info->device_name,
2633                                         status1,dmastatus1,timerstatus1);
2634                 }
2635
2636                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2637                          !status1 && !dmastatus1 && !timerstatus1)
2638                         break;
2639
2640                 for(i=0; i < info->port_count ; i++) {
2641                         if (info->port_array[i] == NULL)
2642                                 continue;
2643                         if (i < 2) {
2644                                 status = status0;
2645                                 dmastatus = dmastatus0;
2646                         } else {
2647                                 status = status1;
2648                                 dmastatus = dmastatus1;
2649                         }
2650
2651                         shift = i & 1 ? 4 :0;
2652
2653                         if (status & BIT0 << shift)
2654                                 isr_rxrdy(info->port_array[i]);
2655                         if (status & BIT1 << shift)
2656                                 isr_txrdy(info->port_array[i]);
2657                         if (status & BIT2 << shift)
2658                                 isr_rxint(info->port_array[i]);
2659                         if (status & BIT3 << shift)
2660                                 isr_txint(info->port_array[i]);
2661
2662                         if (dmastatus & BIT0 << shift)
2663                                 isr_rxdmaerror(info->port_array[i]);
2664                         if (dmastatus & BIT1 << shift)
2665                                 isr_rxdmaok(info->port_array[i]);
2666                         if (dmastatus & BIT2 << shift)
2667                                 isr_txdmaerror(info->port_array[i]);
2668                         if (dmastatus & BIT3 << shift)
2669                                 isr_txdmaok(info->port_array[i]);
2670                 }
2671
2672                 if (timerstatus0 & (BIT5 | BIT4))
2673                         isr_timer(info->port_array[0]);
2674                 if (timerstatus0 & (BIT7 | BIT6))
2675                         isr_timer(info->port_array[1]);
2676                 if (timerstatus1 & (BIT5 | BIT4))
2677                         isr_timer(info->port_array[2]);
2678                 if (timerstatus1 & (BIT7 | BIT6))
2679                         isr_timer(info->port_array[3]);
2680         }
2681
2682         for(i=0; i < info->port_count ; i++) {
2683                 SLMP_INFO * port = info->port_array[i];
2684
2685                 /* Request bottom half processing if there's something
2686                  * for it to do and the bh is not already running.
2687                  *
2688                  * Note: startup adapter diags require interrupts.
2689                  * do not request bottom half processing if the
2690                  * device is not open in a normal mode.
2691                  */
2692                 if ( port && (port->count || port->netcount) &&
2693                      port->pending_bh && !port->bh_running &&
2694                      !port->bh_requested ) {
2695                         if ( debug_level >= DEBUG_LEVEL_ISR )
2696                                 printk("%s(%d):%s queueing bh task.\n",
2697                                         __FILE__,__LINE__,port->device_name);
2698                         schedule_work(&port->task);
2699                         port->bh_requested = 1;
2700                 }
2701         }
2702
2703         spin_unlock(&info->lock);
2704
2705         if ( debug_level >= DEBUG_LEVEL_ISR )
2706                 printk("%s(%d):synclinkmp_interrupt(%d)exit.\n",
2707                         __FILE__,__LINE__,irq);
2708         return IRQ_HANDLED;
2709 }
2710
2711 /* Initialize and start device.
2712  */
2713 static int startup(SLMP_INFO * info)
2714 {
2715         if ( debug_level >= DEBUG_LEVEL_INFO )
2716                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2717
2718         if (info->flags & ASYNC_INITIALIZED)
2719                 return 0;
2720
2721         if (!info->tx_buf) {
2722                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2723                 if (!info->tx_buf) {
2724                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2725                                 __FILE__,__LINE__,info->device_name);
2726                         return -ENOMEM;
2727                 }
2728         }
2729
2730         info->pending_bh = 0;
2731
2732         memset(&info->icount, 0, sizeof(info->icount));
2733
2734         /* program hardware for current parameters */
2735         reset_port(info);
2736
2737         change_params(info);
2738
2739         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2740
2741         if (info->tty)
2742                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2743
2744         info->flags |= ASYNC_INITIALIZED;
2745
2746         return 0;
2747 }
2748
2749 /* Called by close() and hangup() to shutdown hardware
2750  */
2751 static void shutdown(SLMP_INFO * info)
2752 {
2753         unsigned long flags;
2754
2755         if (!(info->flags & ASYNC_INITIALIZED))
2756                 return;
2757
2758         if (debug_level >= DEBUG_LEVEL_INFO)
2759                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2760                          __FILE__,__LINE__, info->device_name );
2761
2762         /* clear status wait queue because status changes */
2763         /* can't happen after shutting down the hardware */
2764         wake_up_interruptible(&info->status_event_wait_q);
2765         wake_up_interruptible(&info->event_wait_q);
2766
2767         del_timer(&info->tx_timer);
2768         del_timer(&info->status_timer);
2769
2770         kfree(info->tx_buf);
2771         info->tx_buf = NULL;
2772
2773         spin_lock_irqsave(&info->lock,flags);
2774
2775         reset_port(info);
2776
2777         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2778                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2779                 set_signals(info);
2780         }
2781
2782         spin_unlock_irqrestore(&info->lock,flags);
2783
2784         if (info->tty)
2785                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2786
2787         info->flags &= ~ASYNC_INITIALIZED;
2788 }
2789
2790 static void program_hw(SLMP_INFO *info)
2791 {
2792         unsigned long flags;
2793
2794         spin_lock_irqsave(&info->lock,flags);
2795
2796         rx_stop(info);
2797         tx_stop(info);
2798
2799         info->tx_count = info->tx_put = info->tx_get = 0;
2800
2801         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2802                 hdlc_mode(info);
2803         else
2804                 async_mode(info);
2805
2806         set_signals(info);
2807
2808         info->dcd_chkcount = 0;
2809         info->cts_chkcount = 0;
2810         info->ri_chkcount = 0;
2811         info->dsr_chkcount = 0;
2812
2813         info->ie1_value |= (CDCD|CCTS);
2814         write_reg(info, IE1, info->ie1_value);
2815
2816         get_signals(info);
2817
2818         if (info->netcount || (info->tty && info->tty->termios->c_cflag & CREAD) )
2819                 rx_start(info);
2820
2821         spin_unlock_irqrestore(&info->lock,flags);
2822 }
2823
2824 /* Reconfigure adapter based on new parameters
2825  */
2826 static void change_params(SLMP_INFO *info)
2827 {
2828         unsigned cflag;
2829         int bits_per_char;
2830
2831         if (!info->tty || !info->tty->termios)
2832                 return;
2833
2834         if (debug_level >= DEBUG_LEVEL_INFO)
2835                 printk("%s(%d):%s change_params()\n",
2836                          __FILE__,__LINE__, info->device_name );
2837
2838         cflag = info->tty->termios->c_cflag;
2839
2840         /* if B0 rate (hangup) specified then negate DTR and RTS */
2841         /* otherwise assert DTR and RTS */
2842         if (cflag & CBAUD)
2843                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2844         else
2845                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2846
2847         /* byte size and parity */
2848
2849         switch (cflag & CSIZE) {
2850               case CS5: info->params.data_bits = 5; break;
2851               case CS6: info->params.data_bits = 6; break;
2852               case CS7: info->params.data_bits = 7; break;
2853               case CS8: info->params.data_bits = 8; break;
2854               /* Never happens, but GCC is too dumb to figure it out */
2855               default:  info->params.data_bits = 7; break;
2856               }
2857
2858         if (cflag & CSTOPB)
2859                 info->params.stop_bits = 2;
2860         else
2861                 info->params.stop_bits = 1;
2862
2863         info->params.parity = ASYNC_PARITY_NONE;
2864         if (cflag & PARENB) {
2865                 if (cflag & PARODD)
2866                         info->params.parity = ASYNC_PARITY_ODD;
2867                 else
2868                         info->params.parity = ASYNC_PARITY_EVEN;
2869 #ifdef CMSPAR
2870                 if (cflag & CMSPAR)
2871                         info->params.parity = ASYNC_PARITY_SPACE;
2872 #endif
2873         }
2874
2875         /* calculate number of jiffies to transmit a full
2876          * FIFO (32 bytes) at specified data rate
2877          */
2878         bits_per_char = info->params.data_bits +
2879                         info->params.stop_bits + 1;
2880
2881         /* if port data rate is set to 460800 or less then
2882          * allow tty settings to override, otherwise keep the
2883          * current data rate.
2884          */
2885         if (info->params.data_rate <= 460800) {
2886                 info->params.data_rate = tty_get_baud_rate(info->tty);
2887         }
2888
2889         if ( info->params.data_rate ) {
2890                 info->timeout = (32*HZ*bits_per_char) /
2891                                 info->params.data_rate;
2892         }
2893         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2894
2895         if (cflag & CRTSCTS)
2896                 info->flags |= ASYNC_CTS_FLOW;
2897         else
2898                 info->flags &= ~ASYNC_CTS_FLOW;
2899
2900         if (cflag & CLOCAL)
2901                 info->flags &= ~ASYNC_CHECK_CD;
2902         else
2903                 info->flags |= ASYNC_CHECK_CD;
2904
2905         /* process tty input control flags */
2906
2907         info->read_status_mask2 = OVRN;
2908         if (I_INPCK(info->tty))
2909                 info->read_status_mask2 |= PE | FRME;
2910         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2911                 info->read_status_mask1 |= BRKD;
2912         if (I_IGNPAR(info->tty))
2913                 info->ignore_status_mask2 |= PE | FRME;
2914         if (I_IGNBRK(info->tty)) {
2915                 info->ignore_status_mask1 |= BRKD;
2916                 /* If ignoring parity and break indicators, ignore
2917                  * overruns too.  (For real raw support).
2918                  */
2919                 if (I_IGNPAR(info->tty))
2920                         info->ignore_status_mask2 |= OVRN;
2921         }
2922
2923         program_hw(info);
2924 }
2925
2926 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2927 {
2928         int err;
2929
2930         if (debug_level >= DEBUG_LEVEL_INFO)
2931                 printk("%s(%d):%s get_params()\n",
2932                          __FILE__,__LINE__, info->device_name);
2933
2934         if (!user_icount) {
2935                 memset(&info->icount, 0, sizeof(info->icount));
2936         } else {
2937                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2938                 if (err)
2939                         return -EFAULT;
2940         }
2941
2942         return 0;
2943 }
2944
2945 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2946 {
2947         int err;
2948         if (debug_level >= DEBUG_LEVEL_INFO)
2949                 printk("%s(%d):%s get_params()\n",
2950                          __FILE__,__LINE__, info->device_name);
2951
2952         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2953         if (err) {
2954                 if ( debug_level >= DEBUG_LEVEL_INFO )
2955                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2956                                 __FILE__,__LINE__,info->device_name);
2957                 return -EFAULT;
2958         }
2959
2960         return 0;
2961 }
2962
2963 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2964 {
2965         unsigned long flags;
2966         MGSL_PARAMS tmp_params;
2967         int err;
2968
2969         if (debug_level >= DEBUG_LEVEL_INFO)
2970                 printk("%s(%d):%s set_params\n",
2971                         __FILE__,__LINE__,info->device_name );
2972         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2973         if (err) {
2974                 if ( debug_level >= DEBUG_LEVEL_INFO )
2975                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2976                                 __FILE__,__LINE__,info->device_name);
2977                 return -EFAULT;
2978         }
2979
2980         spin_lock_irqsave(&info->lock,flags);
2981         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2982         spin_unlock_irqrestore(&info->lock,flags);
2983
2984         change_params(info);
2985
2986         return 0;
2987 }
2988
2989 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2990 {
2991         int err;
2992
2993         if (debug_level >= DEBUG_LEVEL_INFO)
2994                 printk("%s(%d):%s get_txidle()=%d\n",
2995                          __FILE__,__LINE__, info->device_name, info->idle_mode);
2996
2997         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
2998         if (err) {
2999                 if ( debug_level >= DEBUG_LEVEL_INFO )
3000                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
3001                                 __FILE__,__LINE__,info->device_name);
3002                 return -EFAULT;
3003         }
3004
3005         return 0;
3006 }
3007
3008 static int set_txidle(SLMP_INFO * info, int idle_mode)
3009 {
3010         unsigned long flags;
3011
3012         if (debug_level >= DEBUG_LEVEL_INFO)
3013                 printk("%s(%d):%s set_txidle(%d)\n",
3014                         __FILE__,__LINE__,info->device_name, idle_mode );
3015
3016         spin_lock_irqsave(&info->lock,flags);
3017         info->idle_mode = idle_mode;
3018         tx_set_idle( info );
3019         spin_unlock_irqrestore(&info->lock,flags);
3020         return 0;
3021 }
3022
3023 static int tx_enable(SLMP_INFO * info, int enable)
3024 {
3025         unsigned long flags;
3026
3027         if (debug_level >= DEBUG_LEVEL_INFO)
3028                 printk("%s(%d):%s tx_enable(%d)\n",
3029                         __FILE__,__LINE__,info->device_name, enable);
3030
3031         spin_lock_irqsave(&info->lock,flags);
3032         if ( enable ) {
3033                 if ( !info->tx_enabled ) {
3034                         tx_start(info);
3035                 }
3036         } else {
3037                 if ( info->tx_enabled )
3038                         tx_stop(info);
3039         }
3040         spin_unlock_irqrestore(&info->lock,flags);
3041         return 0;
3042 }
3043
3044 /* abort send HDLC frame
3045  */
3046 static int tx_abort(SLMP_INFO * info)
3047 {
3048         unsigned long flags;
3049
3050         if (debug_level >= DEBUG_LEVEL_INFO)
3051                 printk("%s(%d):%s tx_abort()\n",
3052                         __FILE__,__LINE__,info->device_name);
3053
3054         spin_lock_irqsave(&info->lock,flags);
3055         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3056                 info->ie1_value &= ~UDRN;
3057                 info->ie1_value |= IDLE;
3058                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
3059                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
3060
3061                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
3062                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3063
3064                 write_reg(info, CMD, TXABORT);
3065         }
3066         spin_unlock_irqrestore(&info->lock,flags);
3067         return 0;
3068 }
3069
3070 static int rx_enable(SLMP_INFO * info, int enable)
3071 {
3072         unsigned long flags;
3073
3074         if (debug_level >= DEBUG_LEVEL_INFO)
3075                 printk("%s(%d):%s rx_enable(%d)\n",
3076                         __FILE__,__LINE__,info->device_name,enable);
3077
3078         spin_lock_irqsave(&info->lock,flags);
3079         if ( enable ) {
3080                 if ( !info->rx_enabled )
3081                         rx_start(info);
3082         } else {
3083                 if ( info->rx_enabled )
3084                         rx_stop(info);
3085         }
3086         spin_unlock_irqrestore(&info->lock,flags);
3087         return 0;
3088 }
3089
3090 /* wait for specified event to occur
3091  */
3092 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3093 {
3094         unsigned long flags;
3095         int s;
3096         int rc=0;
3097         struct mgsl_icount cprev, cnow;
3098         int events;
3099         int mask;
3100         struct  _input_signal_events oldsigs, newsigs;
3101         DECLARE_WAITQUEUE(wait, current);
3102
3103         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3104         if (rc) {
3105                 return  -EFAULT;
3106         }
3107
3108         if (debug_level >= DEBUG_LEVEL_INFO)
3109                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3110                         __FILE__,__LINE__,info->device_name,mask);
3111
3112         spin_lock_irqsave(&info->lock,flags);
3113
3114         /* return immediately if state matches requested events */
3115         get_signals(info);
3116         s = info->serial_signals;
3117
3118         events = mask &
3119                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3120                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3121                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3122                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3123         if (events) {
3124                 spin_unlock_irqrestore(&info->lock,flags);
3125                 goto exit;
3126         }
3127
3128         /* save current irq counts */
3129         cprev = info->icount;
3130         oldsigs = info->input_signal_events;
3131
3132         /* enable hunt and idle irqs if needed */
3133         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3134                 unsigned char oldval = info->ie1_value;
3135                 unsigned char newval = oldval +
3136                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3137                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3138                 if ( oldval != newval ) {
3139                         info->ie1_value = newval;
3140                         write_reg(info, IE1, info->ie1_value);
3141                 }
3142         }
3143
3144         set_current_state(TASK_INTERRUPTIBLE);
3145         add_wait_queue(&info->event_wait_q, &wait);
3146
3147         spin_unlock_irqrestore(&info->lock,flags);
3148
3149         for(;;) {
3150                 schedule();
3151                 if (signal_pending(current)) {
3152                         rc = -ERESTARTSYS;
3153                         break;
3154                 }
3155
3156                 /* get current irq counts */
3157                 spin_lock_irqsave(&info->lock,flags);
3158                 cnow = info->icount;
3159                 newsigs = info->input_signal_events;
3160                 set_current_state(TASK_INTERRUPTIBLE);
3161                 spin_unlock_irqrestore(&info->lock,flags);
3162
3163                 /* if no change, wait aborted for some reason */
3164                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3165                     newsigs.dsr_down == oldsigs.dsr_down &&
3166                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3167                     newsigs.dcd_down == oldsigs.dcd_down &&
3168                     newsigs.cts_up   == oldsigs.cts_up   &&
3169                     newsigs.cts_down == oldsigs.cts_down &&
3170                     newsigs.ri_up    == oldsigs.ri_up    &&
3171                     newsigs.ri_down  == oldsigs.ri_down  &&
3172                     cnow.exithunt    == cprev.exithunt   &&
3173                     cnow.rxidle      == cprev.rxidle) {
3174                         rc = -EIO;
3175                         break;
3176                 }
3177
3178                 events = mask &
3179                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3180                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3181                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3182                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3183                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3184                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3185                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3186                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3187                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3188                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3189                 if (events)
3190                         break;
3191
3192                 cprev = cnow;
3193                 oldsigs = newsigs;
3194         }
3195
3196         remove_wait_queue(&info->event_wait_q, &wait);
3197         set_current_state(TASK_RUNNING);
3198
3199
3200         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3201                 spin_lock_irqsave(&info->lock,flags);
3202                 if (!waitqueue_active(&info->event_wait_q)) {
3203                         /* disable enable exit hunt mode/idle rcvd IRQs */
3204                         info->ie1_value &= ~(FLGD|IDLD);
3205                         write_reg(info, IE1, info->ie1_value);
3206                 }
3207                 spin_unlock_irqrestore(&info->lock,flags);
3208         }
3209 exit:
3210         if ( rc == 0 )
3211                 PUT_USER(rc, events, mask_ptr);
3212
3213         return rc;
3214 }
3215
3216 static int modem_input_wait(SLMP_INFO *info,int arg)
3217 {
3218         unsigned long flags;
3219         int rc;
3220         struct mgsl_icount cprev, cnow;
3221         DECLARE_WAITQUEUE(wait, current);
3222
3223         /* save current irq counts */
3224         spin_lock_irqsave(&info->lock,flags);
3225         cprev = info->icount;
3226         add_wait_queue(&info->status_event_wait_q, &wait);
3227         set_current_state(TASK_INTERRUPTIBLE);
3228         spin_unlock_irqrestore(&info->lock,flags);
3229
3230         for(;;) {
3231                 schedule();
3232                 if (signal_pending(current)) {
3233                         rc = -ERESTARTSYS;
3234                         break;
3235                 }
3236
3237                 /* get new irq counts */
3238                 spin_lock_irqsave(&info->lock,flags);
3239                 cnow = info->icount;
3240                 set_current_state(TASK_INTERRUPTIBLE);
3241                 spin_unlock_irqrestore(&info->lock,flags);
3242
3243                 /* if no change, wait aborted for some reason */
3244                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3245                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3246                         rc = -EIO;
3247                         break;
3248                 }
3249
3250                 /* check for change in caller specified modem input */
3251                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3252                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3253                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3254                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3255                         rc = 0;
3256                         break;
3257                 }
3258
3259                 cprev = cnow;
3260         }
3261         remove_wait_queue(&info->status_event_wait_q, &wait);
3262         set_current_state(TASK_RUNNING);
3263         return rc;
3264 }
3265
3266 /* return the state of the serial control and status signals
3267  */
3268 static int tiocmget(struct tty_struct *tty, struct file *file)
3269 {
3270         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3271         unsigned int result;
3272         unsigned long flags;
3273
3274         spin_lock_irqsave(&info->lock,flags);
3275         get_signals(info);
3276         spin_unlock_irqrestore(&info->lock,flags);
3277
3278         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3279                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3280                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3281                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3282                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3283                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3284
3285         if (debug_level >= DEBUG_LEVEL_INFO)
3286                 printk("%s(%d):%s tiocmget() value=%08X\n",
3287                          __FILE__,__LINE__, info->device_name, result );
3288         return result;
3289 }
3290
3291 /* set modem control signals (DTR/RTS)
3292  */
3293 static int tiocmset(struct tty_struct *tty, struct file *file,
3294                     unsigned int set, unsigned int clear)
3295 {
3296         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3297         unsigned long flags;
3298
3299         if (debug_level >= DEBUG_LEVEL_INFO)
3300                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3301                         __FILE__,__LINE__,info->device_name, set, clear);
3302
3303         if (set & TIOCM_RTS)
3304                 info->serial_signals |= SerialSignal_RTS;
3305         if (set & TIOCM_DTR)
3306                 info->serial_signals |= SerialSignal_DTR;
3307         if (clear & TIOCM_RTS)
3308                 info->serial_signals &= ~SerialSignal_RTS;
3309         if (clear & TIOCM_DTR)
3310                 info->serial_signals &= ~SerialSignal_DTR;
3311
3312         spin_lock_irqsave(&info->lock,flags);
3313         set_signals(info);
3314         spin_unlock_irqrestore(&info->lock,flags);
3315
3316         return 0;
3317 }
3318
3319
3320
3321 /* Block the current process until the specified port is ready to open.
3322  */
3323 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3324                            SLMP_INFO *info)
3325 {
3326         DECLARE_WAITQUEUE(wait, current);
3327         int             retval;
3328         int             do_clocal = 0, extra_count = 0;
3329         unsigned long   flags;
3330
3331         if (debug_level >= DEBUG_LEVEL_INFO)
3332                 printk("%s(%d):%s block_til_ready()\n",
3333                          __FILE__,__LINE__, tty->driver->name );
3334
3335         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3336                 /* nonblock mode is set or port is not enabled */
3337                 /* just verify that callout device is not active */
3338                 info->flags |= ASYNC_NORMAL_ACTIVE;
3339                 return 0;
3340         }
3341
3342         if (tty->termios->c_cflag & CLOCAL)
3343                 do_clocal = 1;
3344
3345         /* Wait for carrier detect and the line to become
3346          * free (i.e., not in use by the callout).  While we are in
3347          * this loop, info->count is dropped by one, so that
3348          * close() knows when to free things.  We restore it upon
3349          * exit, either normal or abnormal.
3350          */
3351
3352         retval = 0;
3353         add_wait_queue(&info->open_wait, &wait);
3354
3355         if (debug_level >= DEBUG_LEVEL_INFO)
3356                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3357                          __FILE__,__LINE__, tty->driver->name, info->count );
3358
3359         spin_lock_irqsave(&info->lock, flags);
3360         if (!tty_hung_up_p(filp)) {
3361                 extra_count = 1;
3362                 info->count--;
3363         }
3364         spin_unlock_irqrestore(&info->lock, flags);
3365         info->blocked_open++;
3366
3367         while (1) {
3368                 if ((tty->termios->c_cflag & CBAUD)) {
3369                         spin_lock_irqsave(&info->lock,flags);
3370                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3371                         set_signals(info);
3372                         spin_unlock_irqrestore(&info->lock,flags);
3373                 }
3374
3375                 set_current_state(TASK_INTERRUPTIBLE);
3376
3377                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3378                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3379                                         -EAGAIN : -ERESTARTSYS;
3380                         break;
3381                 }
3382
3383                 spin_lock_irqsave(&info->lock,flags);
3384                 get_signals(info);
3385                 spin_unlock_irqrestore(&info->lock,flags);
3386
3387                 if (!(info->flags & ASYNC_CLOSING) &&
3388                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3389                         break;
3390                 }
3391
3392                 if (signal_pending(current)) {
3393                         retval = -ERESTARTSYS;
3394                         break;
3395                 }
3396
3397                 if (debug_level >= DEBUG_LEVEL_INFO)
3398                         printk("%s(%d):%s block_til_ready() count=%d\n",
3399                                  __FILE__,__LINE__, tty->driver->name, info->count );
3400
3401                 schedule();
3402         }
3403
3404         set_current_state(TASK_RUNNING);
3405         remove_wait_queue(&info->open_wait, &wait);
3406
3407         if (extra_count)
3408                 info->count++;
3409         info->blocked_open--;
3410
3411         if (debug_level >= DEBUG_LEVEL_INFO)
3412                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3413                          __FILE__,__LINE__, tty->driver->name, info->count );
3414
3415         if (!retval)
3416                 info->flags |= ASYNC_NORMAL_ACTIVE;
3417
3418         return retval;
3419 }
3420
3421 int alloc_dma_bufs(SLMP_INFO *info)
3422 {
3423         unsigned short BuffersPerFrame;
3424         unsigned short BufferCount;
3425
3426         // Force allocation to start at 64K boundary for each port.
3427         // This is necessary because *all* buffer descriptors for a port
3428         // *must* be in the same 64K block. All descriptors on a port
3429         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3430         // into the CBP register.
3431         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3432
3433         /* Calculate the number of DMA buffers necessary to hold the */
3434         /* largest allowable frame size. Note: If the max frame size is */
3435         /* not an even multiple of the DMA buffer size then we need to */
3436         /* round the buffer count per frame up one. */
3437
3438         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3439         if ( info->max_frame_size % SCABUFSIZE )
3440                 BuffersPerFrame++;
3441
3442         /* calculate total number of data buffers (SCABUFSIZE) possible
3443          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3444          * for the descriptor list (BUFFERLISTSIZE).
3445          */
3446         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3447
3448         /* limit number of buffers to maximum amount of descriptors */
3449         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3450                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3451
3452         /* use enough buffers to transmit one max size frame */
3453         info->tx_buf_count = BuffersPerFrame + 1;
3454
3455         /* never use more than half the available buffers for transmit */
3456         if (info->tx_buf_count > (BufferCount/2))
3457                 info->tx_buf_count = BufferCount/2;
3458
3459         if (info->tx_buf_count > SCAMAXDESC)
3460                 info->tx_buf_count = SCAMAXDESC;
3461
3462         /* use remaining buffers for receive */
3463         info->rx_buf_count = BufferCount - info->tx_buf_count;
3464
3465         if (info->rx_buf_count > SCAMAXDESC)
3466                 info->rx_buf_count = SCAMAXDESC;
3467
3468         if ( debug_level >= DEBUG_LEVEL_INFO )
3469                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3470                         __FILE__,__LINE__, info->device_name,
3471                         info->tx_buf_count,info->rx_buf_count);
3472
3473         if ( alloc_buf_list( info ) < 0 ||
3474                 alloc_frame_bufs(info,
3475                                         info->rx_buf_list,
3476                                         info->rx_buf_list_ex,
3477                                         info->rx_buf_count) < 0 ||
3478                 alloc_frame_bufs(info,
3479                                         info->tx_buf_list,
3480                                         info->tx_buf_list_ex,
3481                                         info->tx_buf_count) < 0 ||
3482                 alloc_tmp_rx_buf(info) < 0 ) {
3483                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3484                         __FILE__,__LINE__, info->device_name);
3485                 return -ENOMEM;
3486         }
3487
3488         rx_reset_buffers( info );
3489
3490         return 0;
3491 }
3492
3493 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3494  */
3495 int alloc_buf_list(SLMP_INFO *info)
3496 {
3497         unsigned int i;
3498
3499         /* build list in adapter shared memory */
3500         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3501         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3502         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3503
3504         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3505
3506         /* Save virtual address pointers to the receive and */
3507         /* transmit buffer lists. (Receive 1st). These pointers will */
3508         /* be used by the processor to access the lists. */
3509         info->rx_buf_list = (SCADESC *)info->buffer_list;
3510
3511         info->tx_buf_list = (SCADESC *)info->buffer_list;
3512         info->tx_buf_list += info->rx_buf_count;
3513
3514         /* Build links for circular buffer entry lists (tx and rx)
3515          *
3516          * Note: links are physical addresses read by the SCA device
3517          * to determine the next buffer entry to use.
3518          */
3519
3520         for ( i = 0; i < info->rx_buf_count; i++ ) {
3521                 /* calculate and store physical address of this buffer entry */
3522                 info->rx_buf_list_ex[i].phys_entry =
3523                         info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3524
3525                 /* calculate and store physical address of */
3526                 /* next entry in cirular list of entries */
3527                 info->rx_buf_list[i].next = info->buffer_list_phys;
3528                 if ( i < info->rx_buf_count - 1 )
3529                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3530
3531                 info->rx_buf_list[i].length = SCABUFSIZE;
3532         }
3533
3534         for ( i = 0; i < info->tx_buf_count; i++ ) {
3535                 /* calculate and store physical address of this buffer entry */
3536                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3537                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3538
3539                 /* calculate and store physical address of */
3540                 /* next entry in cirular list of entries */
3541
3542                 info->tx_buf_list[i].next = info->buffer_list_phys +
3543                         info->rx_buf_count * sizeof(SCADESC);
3544
3545                 if ( i < info->tx_buf_count - 1 )
3546                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3547         }
3548
3549         return 0;
3550 }
3551
3552 /* Allocate the frame DMA buffers used by the specified buffer list.
3553  */
3554 int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3555 {
3556         int i;
3557         unsigned long phys_addr;
3558
3559         for ( i = 0; i < count; i++ ) {
3560                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3561                 phys_addr = info->port_array[0]->last_mem_alloc;
3562                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3563
3564                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3565                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3566         }
3567
3568         return 0;
3569 }
3570
3571 void free_dma_bufs(SLMP_INFO *info)
3572 {
3573         info->buffer_list = NULL;
3574         info->rx_buf_list = NULL;
3575         info->tx_buf_list = NULL;
3576 }
3577
3578 /* allocate buffer large enough to hold max_frame_size.
3579  * This buffer is used to pass an assembled frame to the line discipline.
3580  */
3581 int alloc_tmp_rx_buf(SLMP_INFO *info)
3582 {
3583         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3584         if (info->tmp_rx_buf == NULL)
3585                 return -ENOMEM;
3586         return 0;
3587 }
3588
3589 void free_tmp_rx_buf(SLMP_INFO *info)
3590 {
3591         kfree(info->tmp_rx_buf);
3592         info->tmp_rx_buf = NULL;
3593 }
3594
3595 int claim_resources(SLMP_INFO *info)
3596 {
3597         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3598                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3599                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3600                 info->init_error = DiagStatus_AddressConflict;
3601                 goto errout;
3602         }
3603         else
3604                 info->shared_mem_requested = 1;
3605
3606         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3607                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3608                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3609                 info->init_error = DiagStatus_AddressConflict;
3610                 goto errout;
3611         }
3612         else
3613                 info->lcr_mem_requested = 1;
3614
3615         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3616                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3617                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3618                 info->init_error = DiagStatus_AddressConflict;
3619                 goto errout;
3620         }
3621         else
3622                 info->sca_base_requested = 1;
3623
3624         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3625                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3626                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3627                 info->init_error = DiagStatus_AddressConflict;
3628                 goto errout;
3629         }
3630         else
3631                 info->sca_statctrl_requested = 1;
3632
3633         info->memory_base = ioremap(info->phys_memory_base,SCA_MEM_SIZE);
3634         if (!info->memory_base) {
3635                 printk( "%s(%d):%s Cant map shared memory, MemAddr=%08X\n",
3636                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3637                 info->init_error = DiagStatus_CantAssignPciResources;
3638                 goto errout;
3639         }
3640
3641         info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE);
3642         if (!info->lcr_base) {
3643                 printk( "%s(%d):%s Cant map LCR memory, MemAddr=%08X\n",
3644                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3645                 info->init_error = DiagStatus_CantAssignPciResources;
3646                 goto errout;
3647         }
3648         info->lcr_base += info->lcr_offset;
3649
3650         info->sca_base = ioremap(info->phys_sca_base,PAGE_SIZE);
3651         if (!info->sca_base) {
3652                 printk( "%s(%d):%s Cant map SCA memory, MemAddr=%08X\n",
3653                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3654                 info->init_error = DiagStatus_CantAssignPciResources;
3655                 goto errout;
3656         }
3657         info->sca_base += info->sca_offset;
3658
3659         info->statctrl_base = ioremap(info->phys_statctrl_base,PAGE_SIZE);
3660         if (!info->statctrl_base) {
3661                 printk( "%s(%d):%s Cant map SCA Status/Control memory, MemAddr=%08X\n",
3662                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3663                 info->init_error = DiagStatus_CantAssignPciResources;
3664                 goto errout;
3665         }
3666         info->statctrl_base += info->statctrl_offset;
3667
3668         if ( !memory_test(info) ) {
3669                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3670                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3671                 info->init_error = DiagStatus_MemoryError;
3672                 goto errout;
3673         }
3674
3675         return 0;
3676
3677 errout:
3678         release_resources( info );
3679         return -ENODEV;
3680 }
3681
3682 void release_resources(SLMP_INFO *info)
3683 {
3684         if ( debug_level >= DEBUG_LEVEL_INFO )
3685                 printk( "%s(%d):%s release_resources() entry\n",
3686                         __FILE__,__LINE__,info->device_name );
3687
3688         if ( info->irq_requested ) {
3689                 free_irq(info->irq_level, info);
3690                 info->irq_requested = 0;
3691         }
3692
3693         if ( info->shared_mem_requested ) {
3694                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3695                 info->shared_mem_requested = 0;
3696         }
3697         if ( info->lcr_mem_requested ) {
3698                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3699                 info->lcr_mem_requested = 0;
3700         }
3701         if ( info->sca_base_requested ) {
3702                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3703                 info->sca_base_requested = 0;
3704         }
3705         if ( info->sca_statctrl_requested ) {
3706                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3707                 info->sca_statctrl_requested = 0;
3708         }
3709
3710         if (info->memory_base){
3711                 iounmap(info->memory_base);
3712                 info->memory_base = NULL;
3713         }
3714
3715         if (info->sca_base) {
3716                 iounmap(info->sca_base - info->sca_offset);
3717                 info->sca_base=NULL;
3718         }
3719
3720         if (info->statctrl_base) {
3721                 iounmap(info->statctrl_base - info->statctrl_offset);
3722                 info->statctrl_base=NULL;
3723         }
3724
3725         if (info->lcr_base){
3726                 iounmap(info->lcr_base - info->lcr_offset);
3727                 info->lcr_base = NULL;
3728         }
3729
3730         if ( debug_level >= DEBUG_LEVEL_INFO )
3731                 printk( "%s(%d):%s release_resources() exit\n",
3732                         __FILE__,__LINE__,info->device_name );
3733 }
3734
3735 /* Add the specified device instance data structure to the
3736  * global linked list of devices and increment the device count.
3737  */
3738 void add_device(SLMP_INFO *info)
3739 {
3740         info->next_device = NULL;
3741         info->line = synclinkmp_device_count;
3742         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3743
3744         if (info->line < MAX_DEVICES) {
3745                 if (maxframe[info->line])
3746                         info->max_frame_size = maxframe[info->line];
3747                 info->dosyncppp = dosyncppp[info->line];
3748         }
3749
3750         synclinkmp_device_count++;
3751
3752         if ( !synclinkmp_device_list )
3753                 synclinkmp_device_list = info;
3754         else {
3755                 SLMP_INFO *current_dev = synclinkmp_device_list;
3756                 while( current_dev->next_device )
3757                         current_dev = current_dev->next_device;
3758                 current_dev->next_device = info;
3759         }
3760
3761         if ( info->max_frame_size < 4096 )
3762                 info->max_frame_size = 4096;
3763         else if ( info->max_frame_size > 65535 )
3764                 info->max_frame_size = 65535;
3765
3766         printk( "SyncLink MultiPort %s: "
3767                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3768                 info->device_name,
3769                 info->phys_sca_base,
3770                 info->phys_memory_base,
3771                 info->phys_statctrl_base,
3772                 info->phys_lcr_base,
3773                 info->irq_level,
3774                 info->max_frame_size );
3775
3776 #if SYNCLINK_GENERIC_HDLC
3777         hdlcdev_init(info);
3778 #endif
3779 }
3780
3781 /* Allocate and initialize a device instance structure
3782  *
3783  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3784  */
3785 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3786 {
3787         SLMP_INFO *info;
3788
3789         info = kzalloc(sizeof(SLMP_INFO),
3790                  GFP_KERNEL);
3791
3792         if (!info) {
3793                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3794                         __FILE__,__LINE__, adapter_num, port_num);
3795         } else {
3796                 info->magic = MGSL_MAGIC;
3797                 INIT_WORK(&info->task, bh_handler);
3798                 info->max_frame_size = 4096;
3799                 info->close_delay = 5*HZ/10;
3800                 info->closing_wait = 30*HZ;
3801                 init_waitqueue_head(&info->open_wait);
3802                 init_waitqueue_head(&info->close_wait);
3803                 init_waitqueue_head(&info->status_event_wait_q);
3804                 init_waitqueue_head(&info->event_wait_q);
3805                 spin_lock_init(&info->netlock);
3806                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3807                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3808                 info->adapter_num = adapter_num;
3809                 info->port_num = port_num;
3810
3811                 /* Copy configuration info to device instance data */
3812                 info->irq_level = pdev->irq;
3813                 info->phys_lcr_base = pci_resource_start(pdev,0);
3814                 info->phys_sca_base = pci_resource_start(pdev,2);
3815                 info->phys_memory_base = pci_resource_start(pdev,3);
3816                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3817
3818                 /* Because veremap only works on page boundaries we must map
3819                  * a larger area than is actually implemented for the LCR
3820                  * memory range. We map a full page starting at the page boundary.
3821                  */
3822                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3823                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3824
3825                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3826                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3827
3828                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3829                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3830
3831                 info->bus_type = MGSL_BUS_TYPE_PCI;
3832                 info->irq_flags = IRQF_SHARED;
3833
3834                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3835                 setup_timer(&info->status_timer, status_timeout,
3836                                 (unsigned long)info);
3837
3838                 /* Store the PCI9050 misc control register value because a flaw
3839                  * in the PCI9050 prevents LCR registers from being read if
3840                  * BIOS assigns an LCR base address with bit 7 set.
3841                  *
3842                  * Only the misc control register is accessed for which only
3843                  * write access is needed, so set an initial value and change
3844                  * bits to the device instance data as we write the value
3845                  * to the actual misc control register.
3846                  */
3847                 info->misc_ctrl_value = 0x087e4546;
3848
3849                 /* initial port state is unknown - if startup errors
3850                  * occur, init_error will be set to indicate the
3851                  * problem. Once the port is fully initialized,
3852                  * this value will be set to 0 to indicate the
3853                  * port is available.
3854                  */
3855                 info->init_error = -1;
3856         }
3857
3858         return info;
3859 }
3860
3861 void device_init(int adapter_num, struct pci_dev *pdev)
3862 {
3863         SLMP_INFO *port_array[SCA_MAX_PORTS];
3864         int port;
3865
3866         /* allocate device instances for up to SCA_MAX_PORTS devices */
3867         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3868                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3869                 if( port_array[port] == NULL ) {
3870                         for ( --port; port >= 0; --port )
3871                                 kfree(port_array[port]);
3872                         return;
3873                 }
3874         }
3875
3876         /* give copy of port_array to all ports and add to device list  */
3877         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3878                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3879                 add_device( port_array[port] );
3880                 spin_lock_init(&port_array[port]->lock);
3881         }
3882
3883         /* Allocate and claim adapter resources */
3884         if ( !claim_resources(port_array[0]) ) {
3885
3886                 alloc_dma_bufs(port_array[0]);
3887
3888                 /* copy resource information from first port to others */
3889                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3890                         port_array[port]->lock  = port_array[0]->lock;
3891                         port_array[port]->irq_level     = port_array[0]->irq_level;
3892                         port_array[port]->memory_base   = port_array[0]->memory_base;
3893                         port_array[port]->sca_base      = port_array[0]->sca_base;
3894                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3895                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3896                         alloc_dma_bufs(port_array[port]);
3897                 }
3898
3899                 if ( request_irq(port_array[0]->irq_level,
3900                                         synclinkmp_interrupt,
3901                                         port_array[0]->irq_flags,
3902                                         port_array[0]->device_name,
3903                                         port_array[0]) < 0 ) {
3904                         printk( "%s(%d):%s Cant request interrupt, IRQ=%d\n",
3905                                 __FILE__,__LINE__,
3906                                 port_array[0]->device_name,
3907                                 port_array[0]->irq_level );
3908                 }
3909                 else {
3910                         port_array[0]->irq_requested = 1;
3911                         adapter_test(port_array[0]);
3912                 }
3913         }
3914 }
3915
3916 static const struct tty_operations ops = {
3917         .open = open,
3918         .close = close,
3919         .write = write,
3920         .put_char = put_char,
3921         .flush_chars = flush_chars,
3922         .write_room = write_room,
3923         .chars_in_buffer = chars_in_buffer,
3924         .flush_buffer = flush_buffer,
3925         .ioctl = ioctl,
3926         .throttle = throttle,
3927         .unthrottle = unthrottle,
3928         .send_xchar = send_xchar,
3929         .break_ctl = set_break,
3930         .wait_until_sent = wait_until_sent,
3931         .read_proc = read_proc,
3932         .set_termios = set_termios,
3933         .stop = tx_hold,
3934         .start = tx_release,
3935         .hangup = hangup,
3936         .tiocmget = tiocmget,
3937         .tiocmset = tiocmset,
3938 };
3939
3940 static void synclinkmp_cleanup(void)
3941 {
3942         int rc;
3943         SLMP_INFO *info;
3944         SLMP_INFO *tmp;
3945
3946         printk("Unloading %s %s\n", driver_name, driver_version);
3947
3948         if (serial_driver) {
3949                 if ((rc = tty_unregister_driver(serial_driver)))
3950                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3951                                __FILE__,__LINE__,rc);
3952                 put_tty_driver(serial_driver);
3953         }
3954
3955         /* reset devices */
3956         info = synclinkmp_device_list;
3957         while(info) {
3958                 reset_port(info);
3959                 info = info->next_device;
3960         }
3961
3962         /* release devices */
3963         info = synclinkmp_device_list;
3964         while(info) {
3965 #if SYNCLINK_GENERIC_HDLC
3966                 hdlcdev_exit(info);
3967 #endif
3968                 free_dma_bufs(info);
3969                 free_tmp_rx_buf(info);
3970                 if ( info->port_num == 0 ) {
3971                         if (info->sca_base)
3972                                 write_reg(info, LPR, 1); /* set low power mode */
3973                         release_resources(info);
3974                 }
3975                 tmp = info;
3976                 info = info->next_device;
3977                 kfree(tmp);
3978         }
3979
3980         pci_unregister_driver(&synclinkmp_pci_driver);
3981 }
3982
3983 /* Driver initialization entry point.
3984  */
3985
3986 static int __init synclinkmp_init(void)
3987 {
3988         int rc;
3989
3990         if (break_on_load) {
3991                 synclinkmp_get_text_ptr();
3992                 BREAKPOINT();
3993         }
3994
3995         printk("%s %s\n", driver_name, driver_version);
3996
3997         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
3998                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
3999                 return rc;
4000         }
4001
4002         serial_driver = alloc_tty_driver(128);
4003         if (!serial_driver) {
4004                 rc = -ENOMEM;
4005                 goto error;
4006         }
4007
4008         /* Initialize the tty_driver structure */
4009
4010         serial_driver->owner = THIS_MODULE;
4011         serial_driver->driver_name = "synclinkmp";
4012         serial_driver->name = "ttySLM";
4013         serial_driver->major = ttymajor;
4014         serial_driver->minor_start = 64;
4015         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4016         serial_driver->subtype = SERIAL_TYPE_NORMAL;
4017         serial_driver->init_termios = tty_std_termios;
4018         serial_driver->init_termios.c_cflag =
4019                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4020         serial_driver->init_termios.c_ispeed = 9600;
4021         serial_driver->init_termios.c_ospeed = 9600;
4022         serial_driver->flags = TTY_DRIVER_REAL_RAW;
4023         tty_set_operations(serial_driver, &ops);
4024         if ((rc = tty_register_driver(serial_driver)) < 0) {
4025                 printk("%s(%d):Couldn't register serial driver\n",
4026                         __FILE__,__LINE__);
4027                 put_tty_driver(serial_driver);
4028                 serial_driver = NULL;
4029                 goto error;
4030         }
4031
4032         printk("%s %s, tty major#%d\n",
4033                 driver_name, driver_version,
4034                 serial_driver->major);
4035
4036         return 0;
4037
4038 error:
4039         synclinkmp_cleanup();
4040         return rc;
4041 }
4042
4043 static void __exit synclinkmp_exit(void)
4044 {
4045         synclinkmp_cleanup();
4046 }
4047
4048 module_init(synclinkmp_init);
4049 module_exit(synclinkmp_exit);
4050
4051 /* Set the port for internal loopback mode.
4052  * The TxCLK and RxCLK signals are generated from the BRG and
4053  * the TxD is looped back to the RxD internally.
4054  */
4055 void enable_loopback(SLMP_INFO *info, int enable)
4056 {
4057         if (enable) {
4058                 /* MD2 (Mode Register 2)
4059                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4060                  */
4061                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4062
4063                 /* degate external TxC clock source */
4064                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4065                 write_control_reg(info);
4066
4067                 /* RXS/TXS (Rx/Tx clock source)
4068                  * 07      Reserved, must be 0
4069                  * 06..04  Clock Source, 100=BRG
4070                  * 03..00  Clock Divisor, 0000=1
4071                  */
4072                 write_reg(info, RXS, 0x40);
4073                 write_reg(info, TXS, 0x40);
4074
4075         } else {
4076                 /* MD2 (Mode Register 2)
4077                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4078                  */
4079                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4080
4081                 /* RXS/TXS (Rx/Tx clock source)
4082                  * 07      Reserved, must be 0
4083                  * 06..04  Clock Source, 000=RxC/TxC Pin
4084                  * 03..00  Clock Divisor, 0000=1
4085                  */
4086                 write_reg(info, RXS, 0x00);
4087                 write_reg(info, TXS, 0x00);
4088         }
4089
4090         /* set LinkSpeed if available, otherwise default to 2Mbps */
4091         if (info->params.clock_speed)
4092                 set_rate(info, info->params.clock_speed);
4093         else
4094                 set_rate(info, 3686400);
4095 }
4096
4097 /* Set the baud rate register to the desired speed
4098  *
4099  *      data_rate       data rate of clock in bits per second
4100  *                      A data rate of 0 disables the AUX clock.
4101  */
4102 void set_rate( SLMP_INFO *info, u32 data_rate )
4103 {
4104         u32 TMCValue;
4105         unsigned char BRValue;
4106         u32 Divisor=0;
4107
4108         /* fBRG = fCLK/(TMC * 2^BR)
4109          */
4110         if (data_rate != 0) {
4111                 Divisor = 14745600/data_rate;
4112                 if (!Divisor)
4113                         Divisor = 1;
4114
4115                 TMCValue = Divisor;
4116
4117                 BRValue = 0;
4118                 if (TMCValue != 1 && TMCValue != 2) {
4119                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4120                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4121                          * 50/50 duty cycle.
4122                          */
4123                         BRValue = 1;
4124                         TMCValue >>= 1;
4125                 }
4126
4127                 /* while TMCValue is too big for TMC register, divide
4128                  * by 2 and increment BR exponent.
4129                  */
4130                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4131                         TMCValue >>= 1;
4132
4133                 write_reg(info, TXS,
4134                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4135                 write_reg(info, RXS,
4136                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4137                 write_reg(info, TMC, (unsigned char)TMCValue);
4138         }
4139         else {
4140                 write_reg(info, TXS,0);
4141                 write_reg(info, RXS,0);
4142                 write_reg(info, TMC, 0);
4143         }
4144 }
4145
4146 /* Disable receiver
4147  */
4148 void rx_stop(SLMP_INFO *info)
4149 {
4150         if (debug_level >= DEBUG_LEVEL_ISR)
4151                 printk("%s(%d):%s rx_stop()\n",
4152                          __FILE__,__LINE__, info->device_name );
4153
4154         write_reg(info, CMD, RXRESET);
4155
4156         info->ie0_value &= ~RXRDYE;
4157         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4158
4159         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4160         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4161         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4162
4163         info->rx_enabled = 0;
4164         info->rx_overflow = 0;
4165 }
4166
4167 /* enable the receiver
4168  */
4169 void rx_start(SLMP_INFO *info)
4170 {
4171         int i;
4172
4173         if (debug_level >= DEBUG_LEVEL_ISR)
4174                 printk("%s(%d):%s rx_start()\n",
4175                          __FILE__,__LINE__, info->device_name );
4176
4177         write_reg(info, CMD, RXRESET);
4178
4179         if ( info->params.mode == MGSL_MODE_HDLC ) {
4180                 /* HDLC, disabe IRQ on rxdata */
4181                 info->ie0_value &= ~RXRDYE;
4182                 write_reg(info, IE0, info->ie0_value);
4183
4184                 /* Reset all Rx DMA buffers and program rx dma */
4185                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4186                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4187
4188                 for (i = 0; i < info->rx_buf_count; i++) {
4189                         info->rx_buf_list[i].status = 0xff;
4190
4191                         // throttle to 4 shared memory writes at a time to prevent
4192                         // hogging local bus (keep latency time for DMA requests low).
4193                         if (!(i % 4))
4194                                 read_status_reg(info);
4195                 }
4196                 info->current_rx_buf = 0;
4197
4198                 /* set current/1st descriptor address */
4199                 write_reg16(info, RXDMA + CDA,
4200                         info->rx_buf_list_ex[0].phys_entry);
4201
4202                 /* set new last rx descriptor address */
4203                 write_reg16(info, RXDMA + EDA,
4204                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4205
4206                 /* set buffer length (shared by all rx dma data buffers) */
4207                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4208
4209                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4210                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4211         } else {
4212                 /* async, enable IRQ on rxdata */
4213                 info->ie0_value |= RXRDYE;
4214                 write_reg(info, IE0, info->ie0_value);
4215         }
4216
4217         write_reg(info, CMD, RXENABLE);
4218
4219         info->rx_overflow = FALSE;
4220         info->rx_enabled = 1;
4221 }
4222
4223 /* Enable the transmitter and send a transmit frame if
4224  * one is loaded in the DMA buffers.
4225  */
4226 void tx_start(SLMP_INFO *info)
4227 {
4228         if (debug_level >= DEBUG_LEVEL_ISR)
4229                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4230                          __FILE__,__LINE__, info->device_name,info->tx_count );
4231
4232         if (!info->tx_enabled ) {
4233                 write_reg(info, CMD, TXRESET);
4234                 write_reg(info, CMD, TXENABLE);
4235                 info->tx_enabled = TRUE;
4236         }
4237
4238         if ( info->tx_count ) {
4239
4240                 /* If auto RTS enabled and RTS is inactive, then assert */
4241                 /* RTS and set a flag indicating that the driver should */
4242                 /* negate RTS when the transmission completes. */
4243
4244                 info->drop_rts_on_tx_done = 0;
4245
4246                 if (info->params.mode != MGSL_MODE_ASYNC) {
4247
4248                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4249                                 get_signals( info );
4250                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4251                                         info->serial_signals |= SerialSignal_RTS;
4252                                         set_signals( info );
4253                                         info->drop_rts_on_tx_done = 1;
4254                                 }
4255                         }
4256
4257                         write_reg16(info, TRC0,
4258                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4259
4260                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4261                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4262
4263                         /* set TX CDA (current descriptor address) */
4264                         write_reg16(info, TXDMA + CDA,
4265                                 info->tx_buf_list_ex[0].phys_entry);
4266
4267                         /* set TX EDA (last descriptor address) */
4268                         write_reg16(info, TXDMA + EDA,
4269                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4270
4271                         /* enable underrun IRQ */
4272                         info->ie1_value &= ~IDLE;
4273                         info->ie1_value |= UDRN;
4274                         write_reg(info, IE1, info->ie1_value);
4275                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4276
4277                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4278                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4279
4280                         mod_timer(&info->tx_timer, jiffies +
4281                                         msecs_to_jiffies(5000));
4282                 }
4283                 else {
4284                         tx_load_fifo(info);
4285                         /* async, enable IRQ on txdata */
4286                         info->ie0_value |= TXRDYE;
4287                         write_reg(info, IE0, info->ie0_value);
4288                 }
4289
4290                 info->tx_active = 1;
4291         }
4292 }
4293
4294 /* stop the transmitter and DMA
4295  */
4296 void tx_stop( SLMP_INFO *info )
4297 {
4298         if (debug_level >= DEBUG_LEVEL_ISR)
4299                 printk("%s(%d):%s tx_stop()\n",
4300                          __FILE__,__LINE__, info->device_name );
4301
4302         del_timer(&info->tx_timer);
4303
4304         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4305         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4306
4307         write_reg(info, CMD, TXRESET);
4308
4309         info->ie1_value &= ~(UDRN + IDLE);
4310         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4311         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4312
4313         info->ie0_value &= ~TXRDYE;
4314         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4315
4316         info->tx_enabled = 0;
4317         info->tx_active  = 0;
4318 }
4319
4320 /* Fill the transmit FIFO until the FIFO is full or
4321  * there is no more data to load.
4322  */
4323 void tx_load_fifo(SLMP_INFO *info)
4324 {
4325         u8 TwoBytes[2];
4326
4327         /* do nothing is now tx data available and no XON/XOFF pending */
4328
4329         if ( !info->tx_count && !info->x_char )
4330                 return;
4331
4332         /* load the Transmit FIFO until FIFOs full or all data sent */
4333
4334         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4335
4336                 /* there is more space in the transmit FIFO and */
4337                 /* there is more data in transmit buffer */
4338
4339                 if ( (info->tx_count > 1) && !info->x_char ) {
4340                         /* write 16-bits */
4341                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4342                         if (info->tx_get >= info->max_frame_size)
4343                                 info->tx_get -= info->max_frame_size;
4344                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4345                         if (info->tx_get >= info->max_frame_size)
4346                                 info->tx_get -= info->max_frame_size;
4347
4348                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4349
4350                         info->tx_count -= 2;
4351                         info->icount.tx += 2;
4352                 } else {
4353                         /* only 1 byte left to transmit or 1 FIFO slot left */
4354
4355                         if (info->x_char) {
4356                                 /* transmit pending high priority char */
4357                                 write_reg(info, TRB, info->x_char);
4358                                 info->x_char = 0;
4359                         } else {
4360                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4361                                 if (info->tx_get >= info->max_frame_size)
4362                                         info->tx_get -= info->max_frame_size;
4363                                 info->tx_count--;
4364                         }
4365                         info->icount.tx++;
4366                 }
4367         }
4368 }
4369
4370 /* Reset a port to a known state
4371  */
4372 void reset_port(SLMP_INFO *info)
4373 {
4374         if (info->sca_base) {
4375
4376                 tx_stop(info);
4377                 rx_stop(info);
4378
4379                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4380                 set_signals(info);
4381
4382                 /* disable all port interrupts */
4383                 info->ie0_value = 0;
4384                 info->ie1_value = 0;
4385                 info->ie2_value = 0;
4386                 write_reg(info, IE0, info->ie0_value);
4387                 write_reg(info, IE1, info->ie1_value);
4388                 write_reg(info, IE2, info->ie2_value);
4389
4390                 write_reg(info, CMD, CHRESET);
4391         }
4392 }
4393
4394 /* Reset all the ports to a known state.
4395  */
4396 void reset_adapter(SLMP_INFO *info)
4397 {
4398         int i;
4399
4400         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4401                 if (info->port_array[i])
4402                         reset_port(info->port_array[i]);
4403         }
4404 }
4405
4406 /* Program port for asynchronous communications.
4407  */
4408 void async_mode(SLMP_INFO *info)
4409 {
4410
4411         unsigned char RegValue;
4412
4413         tx_stop(info);
4414         rx_stop(info);
4415
4416         /* MD0, Mode Register 0
4417          *
4418          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4419          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4420          * 03      Reserved, must be 0
4421          * 02      CRCCC, CRC Calculation, 0=disabled
4422          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4423          *
4424          * 0000 0000
4425          */
4426         RegValue = 0x00;
4427         if (info->params.stop_bits != 1)
4428                 RegValue |= BIT1;
4429         write_reg(info, MD0, RegValue);
4430
4431         /* MD1, Mode Register 1
4432          *
4433          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4434          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4435          * 03..02  RXCHR<1..0>, rx char size
4436          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4437          *
4438          * 0100 0000
4439          */
4440         RegValue = 0x40;
4441         switch (info->params.data_bits) {
4442         case 7: RegValue |= BIT4 + BIT2; break;
4443         case 6: RegValue |= BIT5 + BIT3; break;
4444         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4445         }
4446         if (info->params.parity != ASYNC_PARITY_NONE) {
4447                 RegValue |= BIT1;
4448                 if (info->params.parity == ASYNC_PARITY_ODD)
4449                         RegValue |= BIT0;
4450         }
4451         write_reg(info, MD1, RegValue);
4452
4453         /* MD2, Mode Register 2
4454          *
4455          * 07..02  Reserved, must be 0
4456          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4457          *
4458          * 0000 0000
4459          */
4460         RegValue = 0x00;
4461         if (info->params.loopback)
4462                 RegValue |= (BIT1 + BIT0);
4463         write_reg(info, MD2, RegValue);
4464
4465         /* RXS, Receive clock source
4466          *
4467          * 07      Reserved, must be 0
4468          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4469          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4470          */
4471         RegValue=BIT6;
4472         write_reg(info, RXS, RegValue);
4473
4474         /* TXS, Transmit clock source
4475          *
4476          * 07      Reserved, must be 0
4477          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4478          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4479          */
4480         RegValue=BIT6;
4481         write_reg(info, TXS, RegValue);
4482
4483         /* Control Register
4484          *
4485          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4486          */
4487         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4488         write_control_reg(info);
4489
4490         tx_set_idle(info);
4491
4492         /* RRC Receive Ready Control 0
4493          *
4494          * 07..05  Reserved, must be 0
4495          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4496          */
4497         write_reg(info, RRC, 0x00);
4498
4499         /* TRC0 Transmit Ready Control 0
4500          *
4501          * 07..05  Reserved, must be 0
4502          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4503          */
4504         write_reg(info, TRC0, 0x10);
4505
4506         /* TRC1 Transmit Ready Control 1
4507          *
4508          * 07..05  Reserved, must be 0
4509          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4510          */
4511         write_reg(info, TRC1, 0x1e);
4512
4513         /* CTL, MSCI control register
4514          *
4515          * 07..06  Reserved, set to 0
4516          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4517          * 04      IDLC, idle control, 0=mark 1=idle register
4518          * 03      BRK, break, 0=off 1 =on (async)
4519          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4520          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4521          * 00      RTS, RTS output control, 0=active 1=inactive
4522          *
4523          * 0001 0001
4524          */
4525         RegValue = 0x10;
4526         if (!(info->serial_signals & SerialSignal_RTS))
4527                 RegValue |= 0x01;
4528         write_reg(info, CTL, RegValue);
4529
4530         /* enable status interrupts */
4531         info->ie0_value |= TXINTE + RXINTE;
4532         write_reg(info, IE0, info->ie0_value);
4533
4534         /* enable break detect interrupt */
4535         info->ie1_value = BRKD;
4536         write_reg(info, IE1, info->ie1_value);
4537
4538         /* enable rx overrun interrupt */
4539         info->ie2_value = OVRN;
4540         write_reg(info, IE2, info->ie2_value);
4541
4542         set_rate( info, info->params.data_rate * 16 );
4543 }
4544
4545 /* Program the SCA for HDLC communications.
4546  */
4547 void hdlc_mode(SLMP_INFO *info)
4548 {
4549         unsigned char RegValue;
4550         u32 DpllDivisor;
4551
4552         // Can't use DPLL because SCA outputs recovered clock on RxC when
4553         // DPLL mode selected. This causes output contention with RxC receiver.
4554         // Use of DPLL would require external hardware to disable RxC receiver
4555         // when DPLL mode selected.
4556         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4557
4558         /* disable DMA interrupts */
4559         write_reg(info, TXDMA + DIR, 0);
4560         write_reg(info, RXDMA + DIR, 0);
4561
4562         /* MD0, Mode Register 0
4563          *
4564          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4565          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4566          * 03      Reserved, must be 0
4567          * 02      CRCCC, CRC Calculation, 1=enabled
4568          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4569          * 00      CRC0, CRC initial value, 1 = all 1s
4570          *
4571          * 1000 0001
4572          */
4573         RegValue = 0x81;
4574         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4575                 RegValue |= BIT4;
4576         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4577                 RegValue |= BIT4;
4578         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4579                 RegValue |= BIT2 + BIT1;
4580         write_reg(info, MD0, RegValue);
4581
4582         /* MD1, Mode Register 1
4583          *
4584          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4585          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4586          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4587          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4588          *
4589          * 0000 0000
4590          */
4591         RegValue = 0x00;
4592         write_reg(info, MD1, RegValue);
4593
4594         /* MD2, Mode Register 2
4595          *
4596          * 07      NRZFM, 0=NRZ, 1=FM
4597          * 06..05  CODE<1..0> Encoding, 00=NRZ
4598          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4599          * 02      Reserved, must be 0
4600          * 01..00  CNCT<1..0> Channel connection, 0=normal
4601          *
4602          * 0000 0000
4603          */
4604         RegValue = 0x00;
4605         switch(info->params.encoding) {
4606         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4607         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4608         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4609         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4610 #if 0
4611         case HDLC_ENCODING_NRZB:                                        /* not supported */
4612         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4613         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4614 #endif
4615         }
4616         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4617                 DpllDivisor = 16;
4618                 RegValue |= BIT3;
4619         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4620                 DpllDivisor = 8;
4621         } else {
4622                 DpllDivisor = 32;
4623                 RegValue |= BIT4;
4624         }
4625         write_reg(info, MD2, RegValue);
4626
4627
4628         /* RXS, Receive clock source
4629          *
4630          * 07      Reserved, must be 0
4631          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4632          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4633          */
4634         RegValue=0;
4635         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4636                 RegValue |= BIT6;
4637         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4638                 RegValue |= BIT6 + BIT5;
4639         write_reg(info, RXS, RegValue);
4640
4641         /* TXS, Transmit clock source
4642          *
4643          * 07      Reserved, must be 0
4644          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4645          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4646          */
4647         RegValue=0;
4648         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4649                 RegValue |= BIT6;
4650         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4651                 RegValue |= BIT6 + BIT5;
4652         write_reg(info, TXS, RegValue);
4653
4654         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4655                 set_rate(info, info->params.clock_speed * DpllDivisor);
4656         else
4657                 set_rate(info, info->params.clock_speed);
4658
4659         /* GPDATA (General Purpose I/O Data Register)
4660          *
4661          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4662          */
4663         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4664                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4665         else
4666                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4667         write_control_reg(info);
4668
4669         /* RRC Receive Ready Control 0
4670          *
4671          * 07..05  Reserved, must be 0
4672          * 04..00  RRC<4..0> Rx FIFO trigger active
4673          */
4674         write_reg(info, RRC, rx_active_fifo_level);
4675
4676         /* TRC0 Transmit Ready Control 0
4677          *
4678          * 07..05  Reserved, must be 0
4679          * 04..00  TRC<4..0> Tx FIFO trigger active
4680          */
4681         write_reg(info, TRC0, tx_active_fifo_level);
4682
4683         /* TRC1 Transmit Ready Control 1
4684          *
4685          * 07..05  Reserved, must be 0
4686          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4687          */
4688         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4689
4690         /* DMR, DMA Mode Register
4691          *
4692          * 07..05  Reserved, must be 0
4693          * 04      TMOD, Transfer Mode: 1=chained-block
4694          * 03      Reserved, must be 0
4695          * 02      NF, Number of Frames: 1=multi-frame
4696          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4697          * 00      Reserved, must be 0
4698          *
4699          * 0001 0100
4700          */
4701         write_reg(info, TXDMA + DMR, 0x14);
4702         write_reg(info, RXDMA + DMR, 0x14);
4703
4704         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4705         write_reg(info, RXDMA + CPB,
4706                 (unsigned char)(info->buffer_list_phys >> 16));
4707
4708         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4709         write_reg(info, TXDMA + CPB,
4710                 (unsigned char)(info->buffer_list_phys >> 16));
4711
4712         /* enable status interrupts. other code enables/disables
4713          * the individual sources for these two interrupt classes.
4714          */
4715         info->ie0_value |= TXINTE + RXINTE;
4716         write_reg(info, IE0, info->ie0_value);
4717
4718         /* CTL, MSCI control register
4719          *
4720          * 07..06  Reserved, set to 0
4721          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4722          * 04      IDLC, idle control, 0=mark 1=idle register
4723          * 03      BRK, break, 0=off 1 =on (async)
4724          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4725          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4726          * 00      RTS, RTS output control, 0=active 1=inactive
4727          *
4728          * 0001 0001
4729          */
4730         RegValue = 0x10;
4731         if (!(info->serial_signals & SerialSignal_RTS))
4732                 RegValue |= 0x01;
4733         write_reg(info, CTL, RegValue);
4734
4735         /* preamble not supported ! */
4736
4737         tx_set_idle(info);
4738         tx_stop(info);
4739         rx_stop(info);
4740
4741         set_rate(info, info->params.clock_speed);
4742
4743         if (info->params.loopback)
4744                 enable_loopback(info,1);
4745 }
4746
4747 /* Set the transmit HDLC idle mode
4748  */
4749 void tx_set_idle(SLMP_INFO *info)
4750 {
4751         unsigned char RegValue = 0xff;
4752
4753         /* Map API idle mode to SCA register bits */
4754         switch(info->idle_mode) {
4755         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4756         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4757         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4758         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4759         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4760         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4761         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4762         }
4763
4764         write_reg(info, IDL, RegValue);
4765 }
4766
4767 /* Query the adapter for the state of the V24 status (input) signals.
4768  */
4769 void get_signals(SLMP_INFO *info)
4770 {
4771         u16 status = read_reg(info, SR3);
4772         u16 gpstatus = read_status_reg(info);
4773         u16 testbit;
4774
4775         /* clear all serial signals except DTR and RTS */
4776         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4777
4778         /* set serial signal bits to reflect MISR */
4779
4780         if (!(status & BIT3))
4781                 info->serial_signals |= SerialSignal_CTS;
4782
4783         if ( !(status & BIT2))
4784                 info->serial_signals |= SerialSignal_DCD;
4785
4786         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4787         if (!(gpstatus & testbit))
4788                 info->serial_signals |= SerialSignal_RI;
4789
4790         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4791         if (!(gpstatus & testbit))
4792                 info->serial_signals |= SerialSignal_DSR;
4793 }
4794
4795 /* Set the state of DTR and RTS based on contents of
4796  * serial_signals member of device context.
4797  */
4798 void set_signals(SLMP_INFO *info)
4799 {
4800         unsigned char RegValue;
4801         u16 EnableBit;
4802
4803         RegValue = read_reg(info, CTL);
4804         if (info->serial_signals & SerialSignal_RTS)
4805                 RegValue &= ~BIT0;
4806         else
4807                 RegValue |= BIT0;
4808         write_reg(info, CTL, RegValue);
4809
4810         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4811         EnableBit = BIT1 << (info->port_num*2);
4812         if (info->serial_signals & SerialSignal_DTR)
4813                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4814         else
4815                 info->port_array[0]->ctrlreg_value |= EnableBit;
4816         write_control_reg(info);
4817 }
4818
4819 /*******************/
4820 /* DMA Buffer Code */
4821 /*******************/
4822
4823 /* Set the count for all receive buffers to SCABUFSIZE
4824  * and set the current buffer to the first buffer. This effectively
4825  * makes all buffers free and discards any data in buffers.
4826  */
4827 void rx_reset_buffers(SLMP_INFO *info)
4828 {
4829         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4830 }
4831
4832 /* Free the buffers used by a received frame
4833  *
4834  * info   pointer to device instance data
4835  * first  index of 1st receive buffer of frame
4836  * last   index of last receive buffer of frame
4837  */
4838 void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4839 {
4840         int done = 0;
4841
4842         while(!done) {
4843                 /* reset current buffer for reuse */
4844                 info->rx_buf_list[first].status = 0xff;
4845
4846                 if (first == last) {
4847                         done = 1;
4848                         /* set new last rx descriptor address */
4849                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4850                 }
4851
4852                 first++;
4853                 if (first == info->rx_buf_count)
4854                         first = 0;
4855         }
4856
4857         /* set current buffer to next buffer after last buffer of frame */
4858         info->current_rx_buf = first;
4859 }
4860
4861 /* Return a received frame from the receive DMA buffers.
4862  * Only frames received without errors are returned.
4863  *
4864  * Return Value:        1 if frame returned, otherwise 0
4865  */
4866 int rx_get_frame(SLMP_INFO *info)
4867 {
4868         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4869         unsigned short status;
4870         unsigned int framesize = 0;
4871         int ReturnCode = 0;
4872         unsigned long flags;
4873         struct tty_struct *tty = info->tty;
4874         unsigned char addr_field = 0xff;
4875         SCADESC *desc;
4876         SCADESC_EX *desc_ex;
4877
4878 CheckAgain:
4879         /* assume no frame returned, set zero length */
4880         framesize = 0;
4881         addr_field = 0xff;
4882
4883         /*
4884          * current_rx_buf points to the 1st buffer of the next available
4885          * receive frame. To find the last buffer of the frame look for
4886          * a non-zero status field in the buffer entries. (The status
4887          * field is set by the 16C32 after completing a receive frame.
4888          */
4889         StartIndex = EndIndex = info->current_rx_buf;
4890
4891         for ( ;; ) {
4892                 desc = &info->rx_buf_list[EndIndex];
4893                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4894
4895                 if (desc->status == 0xff)
4896                         goto Cleanup;   /* current desc still in use, no frames available */
4897
4898                 if (framesize == 0 && info->params.addr_filter != 0xff)
4899                         addr_field = desc_ex->virt_addr[0];
4900
4901                 framesize += desc->length;
4902
4903                 /* Status != 0 means last buffer of frame */
4904                 if (desc->status)
4905                         break;
4906
4907                 EndIndex++;
4908                 if (EndIndex == info->rx_buf_count)
4909                         EndIndex = 0;
4910
4911                 if (EndIndex == info->current_rx_buf) {
4912                         /* all buffers have been 'used' but none mark      */
4913                         /* the end of a frame. Reset buffers and receiver. */
4914                         if ( info->rx_enabled ){
4915                                 spin_lock_irqsave(&info->lock,flags);
4916                                 rx_start(info);
4917                                 spin_unlock_irqrestore(&info->lock,flags);
4918                         }
4919                         goto Cleanup;
4920                 }
4921
4922         }
4923
4924         /* check status of receive frame */
4925
4926         /* frame status is byte stored after frame data
4927          *
4928          * 7 EOM (end of msg), 1 = last buffer of frame
4929          * 6 Short Frame, 1 = short frame
4930          * 5 Abort, 1 = frame aborted
4931          * 4 Residue, 1 = last byte is partial
4932          * 3 Overrun, 1 = overrun occurred during frame reception
4933          * 2 CRC,     1 = CRC error detected
4934          *
4935          */
4936         status = desc->status;
4937
4938         /* ignore CRC bit if not using CRC (bit is undefined) */
4939         /* Note:CRC is not save to data buffer */
4940         if (info->params.crc_type == HDLC_CRC_NONE)
4941                 status &= ~BIT2;
4942
4943         if (framesize == 0 ||
4944                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4945                 /* discard 0 byte frames, this seems to occur sometime
4946                  * when remote is idling flags.
4947                  */
4948                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4949                 goto CheckAgain;
4950         }
4951
4952         if (framesize < 2)
4953                 status |= BIT6;
4954
4955         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4956                 /* received frame has errors,
4957                  * update counts and mark frame size as 0
4958                  */
4959                 if (status & BIT6)
4960                         info->icount.rxshort++;
4961                 else if (status & BIT5)
4962                         info->icount.rxabort++;
4963                 else if (status & BIT3)
4964                         info->icount.rxover++;
4965                 else
4966                         info->icount.rxcrc++;
4967
4968                 framesize = 0;
4969 #if SYNCLINK_GENERIC_HDLC
4970                 {
4971                         struct net_device_stats *stats = hdlc_stats(info->netdev);
4972                         stats->rx_errors++;
4973                         stats->rx_frame_errors++;
4974                 }
4975 #endif
4976         }
4977
4978         if ( debug_level >= DEBUG_LEVEL_BH )
4979                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4980                         __FILE__,__LINE__,info->device_name,status,framesize);
4981
4982         if ( debug_level >= DEBUG_LEVEL_DATA )
4983                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4984                         min_t(int, framesize,SCABUFSIZE),0);
4985
4986         if (framesize) {
4987                 if (framesize > info->max_frame_size)
4988                         info->icount.rxlong++;
4989                 else {
4990                         /* copy dma buffer(s) to contiguous intermediate buffer */
4991                         int copy_count = framesize;
4992                         int index = StartIndex;
4993                         unsigned char *ptmp = info->tmp_rx_buf;
4994                         info->tmp_rx_buf_count = framesize;
4995
4996                         info->icount.rxok++;
4997
4998                         while(copy_count) {
4999                                 int partial_count = min(copy_count,SCABUFSIZE);
5000                                 memcpy( ptmp,
5001                                         info->rx_buf_list_ex[index].virt_addr,
5002                                         partial_count );
5003                                 ptmp += partial_count;
5004                                 copy_count -= partial_count;
5005
5006                                 if ( ++index == info->rx_buf_count )
5007                                         index = 0;
5008                         }
5009
5010 #if SYNCLINK_GENERIC_HDLC
5011                         if (info->netcount)
5012                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
5013                         else
5014 #endif
5015                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
5016                                                   info->flag_buf, framesize);
5017                 }
5018         }
5019         /* Free the buffers used by this frame. */
5020         rx_free_frame_buffers( info, StartIndex, EndIndex );
5021
5022         ReturnCode = 1;
5023
5024 Cleanup:
5025         if ( info->rx_enabled && info->rx_overflow ) {
5026                 /* Receiver is enabled, but needs to restarted due to
5027                  * rx buffer overflow. If buffers are empty, restart receiver.
5028                  */
5029                 if (info->rx_buf_list[EndIndex].status == 0xff) {
5030                         spin_lock_irqsave(&info->lock,flags);
5031                         rx_start(info);
5032                         spin_unlock_irqrestore(&info->lock,flags);
5033                 }
5034         }
5035
5036         return ReturnCode;
5037 }
5038
5039 /* load the transmit DMA buffer with data
5040  */
5041 void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5042 {
5043         unsigned short copy_count;
5044         unsigned int i = 0;
5045         SCADESC *desc;
5046         SCADESC_EX *desc_ex;
5047
5048         if ( debug_level >= DEBUG_LEVEL_DATA )
5049                 trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
5050
5051         /* Copy source buffer to one or more DMA buffers, starting with
5052          * the first transmit dma buffer.
5053          */
5054         for(i=0;;)
5055         {
5056                 copy_count = min_t(unsigned short,count,SCABUFSIZE);
5057
5058                 desc = &info->tx_buf_list[i];
5059                 desc_ex = &info->tx_buf_list_ex[i];
5060
5061                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5062
5063                 desc->length = copy_count;
5064                 desc->status = 0;
5065
5066                 buf += copy_count;
5067                 count -= copy_count;
5068
5069                 if (!count)
5070                         break;
5071
5072                 i++;
5073                 if (i >= info->tx_buf_count)
5074                         i = 0;
5075         }
5076
5077         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5078         info->last_tx_buf = ++i;
5079 }
5080
5081 int register_test(SLMP_INFO *info)
5082 {
5083         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5084         static unsigned int count = ARRAY_SIZE(testval);
5085         unsigned int i;
5086         int rc = TRUE;
5087         unsigned long flags;
5088
5089         spin_lock_irqsave(&info->lock,flags);
5090         reset_port(info);
5091
5092         /* assume failure */
5093         info->init_error = DiagStatus_AddressFailure;
5094
5095         /* Write bit patterns to various registers but do it out of */
5096         /* sync, then read back and verify values. */
5097
5098         for (i = 0 ; i < count ; i++) {
5099                 write_reg(info, TMC, testval[i]);
5100                 write_reg(info, IDL, testval[(i+1)%count]);
5101                 write_reg(info, SA0, testval[(i+2)%count]);
5102                 write_reg(info, SA1, testval[(i+3)%count]);
5103
5104                 if ( (read_reg(info, TMC) != testval[i]) ||
5105                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5106                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5107                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5108                 {
5109                         rc = FALSE;
5110                         break;
5111                 }
5112         }
5113
5114         reset_port(info);
5115         spin_unlock_irqrestore(&info->lock,flags);
5116
5117         return rc;
5118 }
5119
5120 int irq_test(SLMP_INFO *info)
5121 {
5122         unsigned long timeout;
5123         unsigned long flags;
5124
5125         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5126
5127         spin_lock_irqsave(&info->lock,flags);
5128         reset_port(info);
5129
5130         /* assume failure */
5131         info->init_error = DiagStatus_IrqFailure;
5132         info->irq_occurred = FALSE;
5133
5134         /* setup timer0 on SCA0 to interrupt */
5135
5136         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5137         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5138
5139         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5140         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5141
5142
5143         /* TMCS, Timer Control/Status Register
5144          *
5145          * 07      CMF, Compare match flag (read only) 1=match
5146          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5147          * 05      Reserved, must be 0
5148          * 04      TME, Timer Enable
5149          * 03..00  Reserved, must be 0
5150          *
5151          * 0101 0000
5152          */
5153         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5154
5155         spin_unlock_irqrestore(&info->lock,flags);
5156
5157         timeout=100;
5158         while( timeout-- && !info->irq_occurred ) {
5159                 msleep_interruptible(10);
5160         }
5161
5162         spin_lock_irqsave(&info->lock,flags);
5163         reset_port(info);
5164         spin_unlock_irqrestore(&info->lock,flags);
5165
5166         return info->irq_occurred;
5167 }
5168
5169 /* initialize individual SCA device (2 ports)
5170  */
5171 static int sca_init(SLMP_INFO *info)
5172 {
5173         /* set wait controller to single mem partition (low), no wait states */
5174         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5175         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5176         write_reg(info, WCRL, 0);       /* wait controller low range */
5177         write_reg(info, WCRM, 0);       /* wait controller mid range */
5178         write_reg(info, WCRH, 0);       /* wait controller high range */
5179
5180         /* DPCR, DMA Priority Control
5181          *
5182          * 07..05  Not used, must be 0
5183          * 04      BRC, bus release condition: 0=all transfers complete
5184          * 03      CCC, channel change condition: 0=every cycle
5185          * 02..00  PR<2..0>, priority 100=round robin
5186          *
5187          * 00000100 = 0x04
5188          */
5189         write_reg(info, DPCR, dma_priority);
5190
5191         /* DMA Master Enable, BIT7: 1=enable all channels */
5192         write_reg(info, DMER, 0x80);
5193
5194         /* enable all interrupt classes */
5195         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5196         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5197         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5198
5199         /* ITCR, interrupt control register
5200          * 07      IPC, interrupt priority, 0=MSCI->DMA
5201          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5202          * 04      VOS, Vector Output, 0=unmodified vector
5203          * 03..00  Reserved, must be 0
5204          */
5205         write_reg(info, ITCR, 0);
5206
5207         return TRUE;
5208 }
5209
5210 /* initialize adapter hardware
5211  */
5212 int init_adapter(SLMP_INFO *info)
5213 {
5214         int i;
5215
5216         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5217         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5218         u32 readval;
5219
5220         info->misc_ctrl_value |= BIT30;
5221         *MiscCtrl = info->misc_ctrl_value;
5222
5223         /*
5224          * Force at least 170ns delay before clearing
5225          * reset bit. Each read from LCR takes at least
5226          * 30ns so 10 times for 300ns to be safe.
5227          */
5228         for(i=0;i<10;i++)
5229                 readval = *MiscCtrl;
5230
5231         info->misc_ctrl_value &= ~BIT30;
5232         *MiscCtrl = info->misc_ctrl_value;
5233
5234         /* init control reg (all DTRs off, all clksel=input) */
5235         info->ctrlreg_value = 0xaa;
5236         write_control_reg(info);
5237
5238         {
5239                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5240                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5241
5242                 switch(read_ahead_count)
5243                 {
5244                 case 16:
5245                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5246                         break;
5247                 case 8:
5248                         lcr1_brdr_value |= BIT5 + BIT4;
5249                         break;
5250                 case 4:
5251                         lcr1_brdr_value |= BIT5 + BIT3;
5252                         break;
5253                 case 0:
5254                         lcr1_brdr_value |= BIT5;
5255                         break;
5256                 }
5257
5258                 *LCR1BRDR = lcr1_brdr_value;
5259                 *MiscCtrl = misc_ctrl_value;
5260         }
5261
5262         sca_init(info->port_array[0]);
5263         sca_init(info->port_array[2]);
5264
5265         return TRUE;
5266 }
5267
5268 /* Loopback an HDLC frame to test the hardware
5269  * interrupt and DMA functions.
5270  */
5271 int loopback_test(SLMP_INFO *info)
5272 {
5273 #define TESTFRAMESIZE 20
5274
5275         unsigned long timeout;
5276         u16 count = TESTFRAMESIZE;
5277         unsigned char buf[TESTFRAMESIZE];
5278         int rc = FALSE;
5279         unsigned long flags;
5280
5281         struct tty_struct *oldtty = info->tty;
5282         u32 speed = info->params.clock_speed;
5283
5284         info->params.clock_speed = 3686400;
5285         info->tty = NULL;
5286
5287         /* assume failure */
5288         info->init_error = DiagStatus_DmaFailure;
5289
5290         /* build and send transmit frame */
5291         for (count = 0; count < TESTFRAMESIZE;++count)
5292                 buf[count] = (unsigned char)count;
5293
5294         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5295
5296         /* program hardware for HDLC and enabled receiver */
5297         spin_lock_irqsave(&info->lock,flags);
5298         hdlc_mode(info);
5299         enable_loopback(info,1);
5300         rx_start(info);
5301         info->tx_count = count;
5302         tx_load_dma_buffer(info,buf,count);
5303         tx_start(info);
5304         spin_unlock_irqrestore(&info->lock,flags);
5305
5306         /* wait for receive complete */
5307         /* Set a timeout for waiting for interrupt. */
5308         for ( timeout = 100; timeout; --timeout ) {
5309                 msleep_interruptible(10);
5310
5311                 if (rx_get_frame(info)) {
5312                         rc = TRUE;
5313                         break;
5314                 }
5315         }
5316
5317         /* verify received frame length and contents */
5318         if (rc == TRUE &&
5319                 ( info->tmp_rx_buf_count != count ||
5320                   memcmp(buf, info->tmp_rx_buf,count))) {
5321                 rc = FALSE;
5322         }
5323
5324         spin_lock_irqsave(&info->lock,flags);
5325         reset_adapter(info);
5326         spin_unlock_irqrestore(&info->lock,flags);
5327
5328         info->params.clock_speed = speed;
5329         info->tty = oldtty;
5330
5331         return rc;
5332 }
5333
5334 /* Perform diagnostics on hardware
5335  */
5336 int adapter_test( SLMP_INFO *info )
5337 {
5338         unsigned long flags;
5339         if ( debug_level >= DEBUG_LEVEL_INFO )
5340                 printk( "%s(%d):Testing device %s\n",
5341                         __FILE__,__LINE__,info->device_name );
5342
5343         spin_lock_irqsave(&info->lock,flags);
5344         init_adapter(info);
5345         spin_unlock_irqrestore(&info->lock,flags);
5346
5347         info->port_array[0]->port_count = 0;
5348
5349         if ( register_test(info->port_array[0]) &&
5350                 register_test(info->port_array[1])) {
5351
5352                 info->port_array[0]->port_count = 2;
5353
5354                 if ( register_test(info->port_array[2]) &&
5355                         register_test(info->port_array[3]) )
5356                         info->port_array[0]->port_count += 2;
5357         }
5358         else {
5359                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5360                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5361                 return -ENODEV;
5362         }
5363
5364         if ( !irq_test(info->port_array[0]) ||
5365                 !irq_test(info->port_array[1]) ||
5366                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5367                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5368                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5369                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5370                 return -ENODEV;
5371         }
5372
5373         if (!loopback_test(info->port_array[0]) ||
5374                 !loopback_test(info->port_array[1]) ||
5375                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5376                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5377                 printk( "%s(%d):DMA test failure for device %s\n",
5378                         __FILE__,__LINE__,info->device_name);
5379                 return -ENODEV;
5380         }
5381
5382         if ( debug_level >= DEBUG_LEVEL_INFO )
5383                 printk( "%s(%d):device %s passed diagnostics\n",
5384                         __FILE__,__LINE__,info->device_name );
5385
5386         info->port_array[0]->init_error = 0;
5387         info->port_array[1]->init_error = 0;
5388         if ( info->port_count > 2 ) {
5389                 info->port_array[2]->init_error = 0;
5390                 info->port_array[3]->init_error = 0;
5391         }
5392
5393         return 0;
5394 }
5395
5396 /* Test the shared memory on a PCI adapter.
5397  */
5398 int memory_test(SLMP_INFO *info)
5399 {
5400         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5401                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5402         unsigned long count = ARRAY_SIZE(testval);
5403         unsigned long i;
5404         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5405         unsigned long * addr = (unsigned long *)info->memory_base;
5406
5407         /* Test data lines with test pattern at one location. */
5408
5409         for ( i = 0 ; i < count ; i++ ) {
5410                 *addr = testval[i];
5411                 if ( *addr != testval[i] )
5412                         return FALSE;
5413         }
5414
5415         /* Test address lines with incrementing pattern over */
5416         /* entire address range. */
5417
5418         for ( i = 0 ; i < limit ; i++ ) {
5419                 *addr = i * 4;
5420                 addr++;
5421         }
5422
5423         addr = (unsigned long *)info->memory_base;
5424
5425         for ( i = 0 ; i < limit ; i++ ) {
5426                 if ( *addr != i * 4 )
5427                         return FALSE;
5428                 addr++;
5429         }
5430
5431         memset( info->memory_base, 0, SCA_MEM_SIZE );
5432         return TRUE;
5433 }
5434
5435 /* Load data into PCI adapter shared memory.
5436  *
5437  * The PCI9050 releases control of the local bus
5438  * after completing the current read or write operation.
5439  *
5440  * While the PCI9050 write FIFO not empty, the
5441  * PCI9050 treats all of the writes as a single transaction
5442  * and does not release the bus. This causes DMA latency problems
5443  * at high speeds when copying large data blocks to the shared memory.
5444  *
5445  * This function breaks a write into multiple transations by
5446  * interleaving a read which flushes the write FIFO and 'completes'
5447  * the write transation. This allows any pending DMA request to gain control
5448  * of the local bus in a timely fasion.
5449  */
5450 void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5451 {
5452         /* A load interval of 16 allows for 4 32-bit writes at */
5453         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5454
5455         unsigned short interval = count / sca_pci_load_interval;
5456         unsigned short i;
5457
5458         for ( i = 0 ; i < interval ; i++ )
5459         {
5460                 memcpy(dest, src, sca_pci_load_interval);
5461                 read_status_reg(info);
5462                 dest += sca_pci_load_interval;
5463                 src += sca_pci_load_interval;
5464         }
5465
5466         memcpy(dest, src, count % sca_pci_load_interval);
5467 }
5468
5469 void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5470 {
5471         int i;
5472         int linecount;
5473         if (xmit)
5474                 printk("%s tx data:\n",info->device_name);
5475         else
5476                 printk("%s rx data:\n",info->device_name);
5477
5478         while(count) {
5479                 if (count > 16)
5480                         linecount = 16;
5481                 else
5482                         linecount = count;
5483
5484                 for(i=0;i<linecount;i++)
5485                         printk("%02X ",(unsigned char)data[i]);
5486                 for(;i<17;i++)
5487                         printk("   ");
5488                 for(i=0;i<linecount;i++) {
5489                         if (data[i]>=040 && data[i]<=0176)
5490                                 printk("%c",data[i]);
5491                         else
5492                                 printk(".");
5493                 }
5494                 printk("\n");
5495
5496                 data  += linecount;
5497                 count -= linecount;
5498         }
5499 }       /* end of trace_block() */
5500
5501 /* called when HDLC frame times out
5502  * update stats and do tx completion processing
5503  */
5504 void tx_timeout(unsigned long context)
5505 {
5506         SLMP_INFO *info = (SLMP_INFO*)context;
5507         unsigned long flags;
5508
5509         if ( debug_level >= DEBUG_LEVEL_INFO )
5510                 printk( "%s(%d):%s tx_timeout()\n",
5511                         __FILE__,__LINE__,info->device_name);
5512         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5513                 info->icount.txtimeout++;
5514         }
5515         spin_lock_irqsave(&info->lock,flags);
5516         info->tx_active = 0;
5517         info->tx_count = info->tx_put = info->tx_get = 0;
5518
5519         spin_unlock_irqrestore(&info->lock,flags);
5520
5521 #if SYNCLINK_GENERIC_HDLC
5522         if (info->netcount)
5523                 hdlcdev_tx_done(info);
5524         else
5525 #endif
5526                 bh_transmit(info);
5527 }
5528
5529 /* called to periodically check the DSR/RI modem signal input status
5530  */
5531 void status_timeout(unsigned long context)
5532 {
5533         u16 status = 0;
5534         SLMP_INFO *info = (SLMP_INFO*)context;
5535         unsigned long flags;
5536         unsigned char delta;
5537
5538
5539         spin_lock_irqsave(&info->lock,flags);
5540         get_signals(info);
5541         spin_unlock_irqrestore(&info->lock,flags);
5542
5543         /* check for DSR/RI state change */
5544
5545         delta = info->old_signals ^ info->serial_signals;
5546         info->old_signals = info->serial_signals;
5547
5548         if (delta & SerialSignal_DSR)
5549                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5550
5551         if (delta & SerialSignal_RI)
5552                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5553
5554         if (delta & SerialSignal_DCD)
5555                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5556
5557         if (delta & SerialSignal_CTS)
5558                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5559
5560         if (status)
5561                 isr_io_pin(info,status);
5562
5563         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5564 }
5565
5566
5567 /* Register Access Routines -
5568  * All registers are memory mapped
5569  */
5570 #define CALC_REGADDR() \
5571         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5572         if (info->port_num > 1) \
5573                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5574         if ( info->port_num & 1) { \
5575                 if (Addr > 0x7f) \
5576                         RegAddr += 0x40;        /* DMA access */ \
5577                 else if (Addr > 0x1f && Addr < 0x60) \
5578                         RegAddr += 0x20;        /* MSCI access */ \
5579         }
5580
5581
5582 unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5583 {
5584         CALC_REGADDR();
5585         return *RegAddr;
5586 }
5587 void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5588 {
5589         CALC_REGADDR();
5590         *RegAddr = Value;
5591 }
5592
5593 u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5594 {
5595         CALC_REGADDR();
5596         return *((u16 *)RegAddr);
5597 }
5598
5599 void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5600 {
5601         CALC_REGADDR();
5602         *((u16 *)RegAddr) = Value;
5603 }
5604
5605 unsigned char read_status_reg(SLMP_INFO * info)
5606 {
5607         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5608         return *RegAddr;
5609 }
5610
5611 void write_control_reg(SLMP_INFO * info)
5612 {
5613         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5614         *RegAddr = info->port_array[0]->ctrlreg_value;
5615 }
5616
5617
5618 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5619                                           const struct pci_device_id *ent)
5620 {
5621         if (pci_enable_device(dev)) {
5622                 printk("error enabling pci device %p\n", dev);
5623                 return -EIO;
5624         }
5625         device_init( ++synclinkmp_adapter_count, dev );
5626         return 0;
5627 }
5628
5629 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5630 {
5631 }