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   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 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 139
 140 struct  _input_signal_events {
 141         int     ri_up;
 142         int     ri_down;
 143         int     dsr_up;
 144         int     dsr_down;
 145         int     dcd_up;
 146         int     dcd_down;
 147         int     cts_up;
 148         int     cts_down;
 149 };
 150
 151 /*
 152  * Device instance data structure
 153  */
 154 typedef struct _synclinkmp_info {
 155         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
 156         int                     magic;
 157         int                     flags;
 158         int                     count;          /* count of opens */
 159         int                     line;
 160         unsigned short          close_delay;
 161         unsigned short          closing_wait;   /* time to wait before closing */
 162
 163         struct mgsl_icount      icount;
 164
 165         struct tty_struct       *tty;
 166         int                     timeout;
 167         int                     x_char;         /* xon/xoff character */
 168         int                     blocked_open;   /* # of blocked opens */
 169         u16                     read_status_mask1;  /* break detection (SR1 indications) */
 170         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
 171         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
 172         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
 173         unsigned char           *tx_buf;
 174         int                     tx_put;
 175         int                     tx_get;
 176         int                     tx_count;
 177
 178         wait_queue_head_t       open_wait;
 179         wait_queue_head_t       close_wait;
 180
 181         wait_queue_head_t       status_event_wait_q;
 182         wait_queue_head_t       event_wait_q;
 183         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 184         struct _synclinkmp_info *next_device;   /* device list link */
 185         struct timer_list       status_timer;   /* input signal status check timer */
 186
 187         spinlock_t lock;                /* spinlock for synchronizing with ISR */
 188         struct work_struct task;                        /* task structure for scheduling bh */
 189
 190         u32 max_frame_size;                     /* as set by device config */
 191
 192         u32 pending_bh;
 193
 194         int bh_running;                         /* Protection from multiple */
 195         int isr_overflow;
 196         int bh_requested;
 197
 198         int dcd_chkcount;                       /* check counts to prevent */
 199         int cts_chkcount;                       /* too many IRQs if a signal */
 200         int dsr_chkcount;                       /* is floating */
 201         int ri_chkcount;
 202
 203         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
 204         unsigned long buffer_list_phys;
 205
 206         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
 207         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
 208         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
 209         unsigned int current_rx_buf;
 210
 211         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
 212         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
 213         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
 214         unsigned int last_tx_buf;
 215
 216         unsigned char *tmp_rx_buf;
 217         unsigned int tmp_rx_buf_count;
 218
 219         int rx_enabled;
 220         int rx_overflow;
 221
 222         int tx_enabled;
 223         int tx_active;
 224         u32 idle_mode;
 225
 226         unsigned char ie0_value;
 227         unsigned char ie1_value;
 228         unsigned char ie2_value;
 229         unsigned char ctrlreg_value;
 230         unsigned char old_signals;
 231
 232         char device_name[25];                   /* device instance name */
 233
 234         int port_count;
 235         int adapter_num;
 236         int port_num;
 237
 238         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
 239
 240         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
 241
 242         unsigned int irq_level;                 /* interrupt level */
 243         unsigned long irq_flags;
 244         int irq_requested;                      /* nonzero if IRQ requested */
 245
 246         MGSL_PARAMS params;                     /* communications parameters */
 247
 248         unsigned char serial_signals;           /* current serial signal states */
 249
 250         int irq_occurred;                       /* for diagnostics use */
 251         unsigned int init_error;                /* Initialization startup error */
 252
 253         u32 last_mem_alloc;
 254         unsigned char* memory_base;             /* shared memory address (PCI only) */
 255         u32 phys_memory_base;
 256         int shared_mem_requested;
 257
 258         unsigned char* sca_base;                /* HD64570 SCA Memory address */
 259         u32 phys_sca_base;
 260         u32 sca_offset;
 261         int sca_base_requested;
 262
 263         unsigned char* lcr_base;                /* local config registers (PCI only) */
 264         u32 phys_lcr_base;
 265         u32 lcr_offset;
 266         int lcr_mem_requested;
 267
 268         unsigned char* statctrl_base;           /* status/control register memory */
 269         u32 phys_statctrl_base;
 270         u32 statctrl_offset;
 271         int sca_statctrl_requested;
 272
 273         u32 misc_ctrl_value;
 274         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 275         char char_buf[MAX_ASYNC_BUFFER_SIZE];
 276         BOOLEAN drop_rts_on_tx_done;
 277
 278         struct  _input_signal_events    input_signal_events;
 279
 280         /* SPPP/Cisco HDLC device parts */
 281         int netcount;
 282         int dosyncppp;
 283         spinlock_t netlock;
 284
 285 #if SYNCLINK_GENERIC_HDLC
 286         struct net_device *netdev;
 287 #endif
 288
 289 } SLMP_INFO;
 290
 291 #define MGSL_MAGIC 0x5401
 292
 293 /*
 294  * define serial signal status change macros
 295  */
 296 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
 297 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
 298 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
 299 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
 300
 301 /* Common Register macros */
 302 #define LPR     0x00
 303 #define PABR0   0x02
 304 #define PABR1   0x03
 305 #define WCRL    0x04
 306 #define WCRM    0x05
 307 #define WCRH    0x06
 308 #define DPCR    0x08
 309 #define DMER    0x09
 310 #define ISR0    0x10
 311 #define ISR1    0x11
 312 #define ISR2    0x12
 313 #define IER0    0x14
 314 #define IER1    0x15
 315 #define IER2    0x16
 316 #define ITCR    0x18
 317 #define INTVR   0x1a
 318 #define IMVR    0x1c
 319
 320 /* MSCI Register macros */
 321 #define TRB     0x20
 322 #define TRBL    0x20
 323 #define TRBH    0x21
 324 #define SR0     0x22
 325 #define SR1     0x23
 326 #define SR2     0x24
 327 #define SR3     0x25
 328 #define FST     0x26
 329 #define IE0     0x28
 330 #define IE1     0x29
 331 #define IE2     0x2a
 332 #define FIE     0x2b
 333 #define CMD     0x2c
 334 #define MD0     0x2e
 335 #define MD1     0x2f
 336 #define MD2     0x30
 337 #define CTL     0x31
 338 #define SA0     0x32
 339 #define SA1     0x33
 340 #define IDL     0x34
 341 #define TMC     0x35
 342 #define RXS     0x36
 343 #define TXS     0x37
 344 #define TRC0    0x38
 345 #define TRC1    0x39
 346 #define RRC     0x3a
 347 #define CST0    0x3c
 348 #define CST1    0x3d
 349
 350 /* Timer Register Macros */
 351 #define TCNT    0x60
 352 #define TCNTL   0x60
 353 #define TCNTH   0x61
 354 #define TCONR   0x62
 355 #define TCONRL  0x62
 356 #define TCONRH  0x63
 357 #define TMCS    0x64
 358 #define TEPR    0x65
 359
 360 /* DMA Controller Register macros */
 361 #define DARL    0x80
 362 #define DARH    0x81
 363 #define DARB    0x82
 364 #define BAR     0x80
 365 #define BARL    0x80
 366 #define BARH    0x81
 367 #define BARB    0x82
 368 #define SAR     0x84
 369 #define SARL    0x84
 370 #define SARH    0x85
 371 #define SARB    0x86
 372 #define CPB     0x86
 373 #define CDA     0x88
 374 #define CDAL    0x88
 375 #define CDAH    0x89
 376 #define EDA     0x8a
 377 #define EDAL    0x8a
 378 #define EDAH    0x8b
 379 #define BFL     0x8c
 380 #define BFLL    0x8c
 381 #define BFLH    0x8d
 382 #define BCR     0x8e
 383 #define BCRL    0x8e
 384 #define BCRH    0x8f
 385 #define DSR     0x90
 386 #define DMR     0x91
 387 #define FCT     0x93
 388 #define DIR     0x94
 389 #define DCMD    0x95
 390
 391 /* combine with timer or DMA register address */
 392 #define TIMER0  0x00
 393 #define TIMER1  0x08
 394 #define TIMER2  0x10
 395 #define TIMER3  0x18
 396 #define RXDMA   0x00
 397 #define TXDMA   0x20
 398
 399 /* SCA Command Codes */
 400 #define NOOP            0x00
 401 #define TXRESET         0x01
 402 #define TXENABLE        0x02
 403 #define TXDISABLE       0x03
 404 #define TXCRCINIT       0x04
 405 #define TXCRCEXCL       0x05
 406 #define TXEOM           0x06
 407 #define TXABORT         0x07
 408 #define MPON            0x08
 409 #define TXBUFCLR        0x09
 410 #define RXRESET         0x11
 411 #define RXENABLE        0x12
 412 #define RXDISABLE       0x13
 413 #define RXCRCINIT       0x14
 414 #define RXREJECT        0x15
 415 #define SEARCHMP        0x16
 416 #define RXCRCEXCL       0x17
 417 #define RXCRCCALC       0x18
 418 #define CHRESET         0x21
 419 #define HUNT            0x31
 420
 421 /* DMA command codes */
 422 #define SWABORT         0x01
 423 #define FEICLEAR        0x02
 424
 425 /* IE0 */
 426 #define TXINTE          BIT7
 427 #define RXINTE          BIT6
 428 #define TXRDYE          BIT1
 429 #define RXRDYE          BIT0
 430
 431 /* IE1 & SR1 */
 432 #define UDRN    BIT7
 433 #define IDLE    BIT6
 434 #define SYNCD   BIT4
 435 #define FLGD    BIT4
 436 #define CCTS    BIT3
 437 #define CDCD    BIT2
 438 #define BRKD    BIT1
 439 #define ABTD    BIT1
 440 #define GAPD    BIT1
 441 #define BRKE    BIT0
 442 #define IDLD    BIT0
 443
 444 /* IE2 & SR2 */
 445 #define EOM     BIT7
 446 #define PMP     BIT6
 447 #define SHRT    BIT6
 448 #define PE      BIT5
 449 #define ABT     BIT5
 450 #define FRME    BIT4
 451 #define RBIT    BIT4
 452 #define OVRN    BIT3
 453 #define CRCE    BIT2
 454
 455
 456 /*
 457  * Global linked list of SyncLink devices
 458  */
 459 static SLMP_INFO *synclinkmp_device_list = NULL;
 460 static int synclinkmp_adapter_count = -1;
 461 static int synclinkmp_device_count = 0;
 462
 463 /*
 464  * Set this param to non-zero to load eax with the
 465  * .text section address and breakpoint on module load.
 466  * This is useful for use with gdb and add-symbol-file command.
 467  */
 468 static int break_on_load=0;
 469
 470 /*
 471  * Driver major number, defaults to zero to get auto
 472  * assigned major number. May be forced as module parameter.
 473  */
 474 static int ttymajor=0;
 475
 476 /*
 477  * Array of user specified options for ISA adapters.
 478  */
 479 static int debug_level = 0;
 480 static int maxframe[MAX_DEVICES] = {0,};
 481 static int dosyncppp[MAX_DEVICES] = {0,};
 482
 483 module_param(break_on_load, bool, 0);
 484 module_param(ttymajor, int, 0);
 485 module_param(debug_level, int, 0);
 486 module_param_array(maxframe, int, NULL, 0);
 487 module_param_array(dosyncppp, int, NULL, 0);
 488
 489 static char *driver_name = "SyncLink MultiPort driver";
 490 static char *driver_version = "$Revision: 4.38 $";
 491
 492 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 493 static void synclinkmp_remove_one(struct pci_dev *dev);
 494
 495 static struct pci_device_id synclinkmp_pci_tbl[] = {
 496         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
 497         { 0, }, /* terminate list */
 498 };
 499 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
 500
 501 MODULE_LICENSE("GPL");
 502
 503 static struct pci_driver synclinkmp_pci_driver = {
 504         .name           = "synclinkmp",
 505         .id_table       = synclinkmp_pci_tbl,
 506         .probe          = synclinkmp_init_one,
 507         .remove         = __devexit_p(synclinkmp_remove_one),
 508 };
 509
 510
 511 static struct tty_driver *serial_driver;
 512
 513 /* number of characters left in xmit buffer before we ask for more */
 514 #define WAKEUP_CHARS 256
 515
 516
 517 /* tty callbacks */
 518
 519 static int  open(struct tty_struct *tty, struct file * filp);
 520 static void close(struct tty_struct *tty, struct file * filp);
 521 static void hangup(struct tty_struct *tty);
 522 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 523
 524 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 525 static void put_char(struct tty_struct *tty, unsigned char ch);
 526 static void send_xchar(struct tty_struct *tty, char ch);
 527 static void wait_until_sent(struct tty_struct *tty, int timeout);
 528 static int  write_room(struct tty_struct *tty);
 529 static void flush_chars(struct tty_struct *tty);
 530 static void flush_buffer(struct tty_struct *tty);
 531 static void tx_hold(struct tty_struct *tty);
 532 static void tx_release(struct tty_struct *tty);
 533
 534 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
 535 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
 536 static int  chars_in_buffer(struct tty_struct *tty);
 537 static void throttle(struct tty_struct * tty);
 538 static void unthrottle(struct tty_struct * tty);
 539 static void set_break(struct tty_struct *tty, int break_state);
 540
 541 #if SYNCLINK_GENERIC_HDLC
 542 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 543 static void hdlcdev_tx_done(SLMP_INFO *info);
 544 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
 545 static int  hdlcdev_init(SLMP_INFO *info);
 546 static void hdlcdev_exit(SLMP_INFO *info);
 547 #endif
 548
 549 /* ioctl handlers */
 550
 551 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
 552 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 553 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 554 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
 555 static int  set_txidle(SLMP_INFO *info, int idle_mode);
 556 static int  tx_enable(SLMP_INFO *info, int enable);
 557 static int  tx_abort(SLMP_INFO *info);
 558 static int  rx_enable(SLMP_INFO *info, int enable);
 559 static int  modem_input_wait(SLMP_INFO *info,int arg);
 560 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
 561 static int  tiocmget(struct tty_struct *tty, struct file *file);
 562 static int  tiocmset(struct tty_struct *tty, struct file *file,
 563                      unsigned int set, unsigned int clear);
 564 static void set_break(struct tty_struct *tty, int break_state);
 565
 566 static void add_device(SLMP_INFO *info);
 567 static void device_init(int adapter_num, struct pci_dev *pdev);
 568 static int  claim_resources(SLMP_INFO *info);
 569 static void release_resources(SLMP_INFO *info);
 570
 571 static int  startup(SLMP_INFO *info);
 572 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
 573 static void shutdown(SLMP_INFO *info);
 574 static void program_hw(SLMP_INFO *info);
 575 static void change_params(SLMP_INFO *info);
 576
 577 static int  init_adapter(SLMP_INFO *info);
 578 static int  register_test(SLMP_INFO *info);
 579 static int  irq_test(SLMP_INFO *info);
 580 static int  loopback_test(SLMP_INFO *info);
 581 static int  adapter_test(SLMP_INFO *info);
 582 static int  memory_test(SLMP_INFO *info);
 583
 584 static void reset_adapter(SLMP_INFO *info);
 585 static void reset_port(SLMP_INFO *info);
 586 static void async_mode(SLMP_INFO *info);
 587 static void hdlc_mode(SLMP_INFO *info);
 588
 589 static void rx_stop(SLMP_INFO *info);
 590 static void rx_start(SLMP_INFO *info);
 591 static void rx_reset_buffers(SLMP_INFO *info);
 592 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
 593 static int  rx_get_frame(SLMP_INFO *info);
 594
 595 static void tx_start(SLMP_INFO *info);
 596 static void tx_stop(SLMP_INFO *info);
 597 static void tx_load_fifo(SLMP_INFO *info);
 598 static void tx_set_idle(SLMP_INFO *info);
 599 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
 600
 601 static void get_signals(SLMP_INFO *info);
 602 static void set_signals(SLMP_INFO *info);
 603 static void enable_loopback(SLMP_INFO *info, int enable);
 604 static void set_rate(SLMP_INFO *info, u32 data_rate);
 605
 606 static int  bh_action(SLMP_INFO *info);
 607 static void bh_handler(struct work_struct *work);
 608 static void bh_receive(SLMP_INFO *info);
 609 static void bh_transmit(SLMP_INFO *info);
 610 static void bh_status(SLMP_INFO *info);
 611 static void isr_timer(SLMP_INFO *info);
 612 static void isr_rxint(SLMP_INFO *info);
 613 static void isr_rxrdy(SLMP_INFO *info);
 614 static void isr_txint(SLMP_INFO *info);
 615 static void isr_txrdy(SLMP_INFO *info);
 616 static void isr_rxdmaok(SLMP_INFO *info);
 617 static void isr_rxdmaerror(SLMP_INFO *info);
 618 static void isr_txdmaok(SLMP_INFO *info);
 619 static void isr_txdmaerror(SLMP_INFO *info);
 620 static void isr_io_pin(SLMP_INFO *info, u16 status);
 621
 622 static int  alloc_dma_bufs(SLMP_INFO *info);
 623 static void free_dma_bufs(SLMP_INFO *info);
 624 static int  alloc_buf_list(SLMP_INFO *info);
 625 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
 626 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
 627 static void free_tmp_rx_buf(SLMP_INFO *info);
 628
 629 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
 630 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
 631 static void tx_timeout(unsigned long context);
 632 static void status_timeout(unsigned long context);
 633
 634 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
 635 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
 636 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
 637 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
 638 static unsigned char read_status_reg(SLMP_INFO * info);
 639 static void write_control_reg(SLMP_INFO * info);
 640
 641
 642 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
 643 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
 644 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
 645
 646 static u32 misc_ctrl_value = 0x007e4040;
 647 static u32 lcr1_brdr_value = 0x00800028;
 648
 649 static u32 read_ahead_count = 8;
 650
 651 /* DPCR, DMA Priority Control
 652  *
 653  * 07..05  Not used, must be 0
 654  * 04      BRC, bus release condition: 0=all transfers complete
 655  *              1=release after 1 xfer on all channels
 656  * 03      CCC, channel change condition: 0=every cycle
 657  *              1=after each channel completes all xfers
 658  * 02..00  PR<2..0>, priority 100=round robin
 659  *
 660  * 00000100 = 0x00
 661  */
 662 static unsigned char dma_priority = 0x04;
 663
 664 // Number of bytes that can be written to shared RAM
 665 // in a single write operation
 666 static u32 sca_pci_load_interval = 64;
 667
 668 /*
 669  * 1st function defined in .text section. Calling this function in
 670  * init_module() followed by a breakpoint allows a remote debugger
 671  * (gdb) to get the .text address for the add-symbol-file command.
 672  * This allows remote debugging of dynamically loadable modules.
 673  */
 674 static void* synclinkmp_get_text_ptr(void);
 675 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
 676
 677 static inline int sanity_check(SLMP_INFO *info,
 678                                char *name, const char *routine)
 679 {
 680 #ifdef SANITY_CHECK
 681         static const char *badmagic =
 682                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
 683         static const char *badinfo =
 684                 "Warning: null synclinkmp_struct for (%s) in %s\n";
 685
 686         if (!info) {
 687                 printk(badinfo, name, routine);
 688                 return 1;
 689         }
 690         if (info->magic != MGSL_MAGIC) {
 691                 printk(badmagic, name, routine);
 692                 return 1;
 693         }
 694 #else
 695         if (!info)
 696                 return 1;
 697 #endif
 698         return 0;
 699 }
 700
 701 /**
 702  * line discipline callback wrappers
 703  *
 704  * The wrappers maintain line discipline references
 705  * while calling into the line discipline.
 706  *
 707  * ldisc_receive_buf  - pass receive data to line discipline
 708  */
 709
 710 static void ldisc_receive_buf(struct tty_struct *tty,
 711                               const __u8 *data, char *flags, int count)
 712 {
 713         struct tty_ldisc *ld;
 714         if (!tty)
 715                 return;
 716         ld = tty_ldisc_ref(tty);
 717         if (ld) {
 718                 if (ld->receive_buf)
 719                         ld->receive_buf(tty, data, flags, count);
 720                 tty_ldisc_deref(ld);
 721         }
 722 }
 723
 724 /* tty callbacks */
 725
 726 /* Called when a port is opened.  Init and enable port.
 727  */
 728 static int open(struct tty_struct *tty, struct file *filp)
 729 {
 730         SLMP_INFO *info;
 731         int retval, line;
 732         unsigned long flags;
 733
 734         line = tty->index;
 735         if ((line < 0) || (line >= synclinkmp_device_count)) {
 736                 printk("%s(%d): open with invalid line #%d.\n",
 737                         __FILE__,__LINE__,line);
 738                 return -ENODEV;
 739         }
 740
 741         info = synclinkmp_device_list;
 742         while(info && info->line != line)
 743                 info = info->next_device;
 744         if (sanity_check(info, tty->name, "open"))
 745                 return -ENODEV;
 746         if ( info->init_error ) {
 747                 printk("%s(%d):%s device is not allocated, init error=%d\n",
 748                         __FILE__,__LINE__,info->device_name,info->init_error);
 749                 return -ENODEV;
 750         }
 751
 752         tty->driver_data = info;
 753         info->tty = tty;
 754
 755         if (debug_level >= DEBUG_LEVEL_INFO)
 756                 printk("%s(%d):%s open(), old ref count = %d\n",
 757                          __FILE__,__LINE__,tty->driver->name, info->count);
 758
 759         /* If port is closing, signal caller to try again */
 760         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
 761                 if (info->flags & ASYNC_CLOSING)
 762                         interruptible_sleep_on(&info->close_wait);
 763                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
 764                         -EAGAIN : -ERESTARTSYS);
 765                 goto cleanup;
 766         }
 767
 768         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 769
 770         spin_lock_irqsave(&info->netlock, flags);
 771         if (info->netcount) {
 772                 retval = -EBUSY;
 773                 spin_unlock_irqrestore(&info->netlock, flags);
 774                 goto cleanup;
 775         }
 776         info->count++;
 777         spin_unlock_irqrestore(&info->netlock, flags);
 778
 779         if (info->count == 1) {
 780                 /* 1st open on this device, init hardware */
 781                 retval = startup(info);
 782                 if (retval < 0)
 783                         goto cleanup;
 784         }
 785
 786         retval = block_til_ready(tty, filp, info);
 787         if (retval) {
 788                 if (debug_level >= DEBUG_LEVEL_INFO)
 789                         printk("%s(%d):%s block_til_ready() returned %d\n",
 790                                  __FILE__,__LINE__, info->device_name, retval);
 791                 goto cleanup;
 792         }
 793
 794         if (debug_level >= DEBUG_LEVEL_INFO)
 795                 printk("%s(%d):%s open() success\n",
 796                          __FILE__,__LINE__, info->device_name);
 797         retval = 0;
 798
 799 cleanup:
 800         if (retval) {
 801                 if (tty->count == 1)
 802                         info->tty = NULL; /* tty layer will release tty struct */
 803                 if(info->count)
 804                         info->count--;
 805         }
 806
 807         return retval;
 808 }
 809
 810 /* Called when port is closed. Wait for remaining data to be
 811  * sent. Disable port and free resources.
 812  */
 813 static void close(struct tty_struct *tty, struct file *filp)
 814 {
 815         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
 816
 817         if (sanity_check(info, tty->name, "close"))
 818                 return;
 819
 820         if (debug_level >= DEBUG_LEVEL_INFO)
 821                 printk("%s(%d):%s close() entry, count=%d\n",
 822                          __FILE__,__LINE__, info->device_name, info->count);
 823
 824         if (!info->count)
 825                 return;
 826
 827         if (tty_hung_up_p(filp))
 828                 goto cleanup;
 829
 830         if ((tty->count == 1) && (info->count != 1)) {
 831                 /*
 832                  * tty->count is 1 and the tty structure will be freed.
 833                  * info->count should be one in this case.
 834                  * if it's not, correct it so that the port is shutdown.
 835                  */
 836                 printk("%s(%d):%s close: bad refcount; tty->count is 1, "
 837                        "info->count is %d\n",
 838                          __FILE__,__LINE__, info->device_name, info->count);
 839                 info->count = 1;
 840         }
 841
 842         info->count--;
 843
 844         /* if at least one open remaining, leave hardware active */
 845         if (info->count)
 846                 goto cleanup;
 847
 848         info->flags |= ASYNC_CLOSING;
 849
 850         /* set tty->closing to notify line discipline to
 851          * only process XON/XOFF characters. Only the N_TTY
 852          * discipline appears to use this (ppp does not).
 853          */
 854         tty->closing = 1;
 855
 856         /* wait for transmit data to clear all layers */
 857
 858         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
 859                 if (debug_level >= DEBUG_LEVEL_INFO)
 860                         printk("%s(%d):%s close() calling tty_wait_until_sent\n",
 861                                  __FILE__,__LINE__, info->device_name );
 862                 tty_wait_until_sent(tty, info->closing_wait);
 863         }
 864
 865         if (info->flags & ASYNC_INITIALIZED)
 866                 wait_until_sent(tty, info->timeout);
 867
 868         if (tty->driver->flush_buffer)
 869                 tty->driver->flush_buffer(tty);
 870
 871         tty_ldisc_flush(tty);
 872
 873         shutdown(info);
 874
 875         tty->closing = 0;
 876         info->tty = NULL;
 877
 878         if (info->blocked_open) {
 879                 if (info->close_delay) {
 880                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
 881                 }
 882                 wake_up_interruptible(&info->open_wait);
 883         }
 884
 885         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 886
 887         wake_up_interruptible(&info->close_wait);
 888
 889 cleanup:
 890         if (debug_level >= DEBUG_LEVEL_INFO)
 891                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
 892                         tty->driver->name, info->count);
 893 }
 894
 895 /* Called by tty_hangup() when a hangup is signaled.
 896  * This is the same as closing all open descriptors for the port.
 897  */
 898 static void hangup(struct tty_struct *tty)
 899 {
 900         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 901
 902         if (debug_level >= DEBUG_LEVEL_INFO)
 903                 printk("%s(%d):%s hangup()\n",
 904                          __FILE__,__LINE__, info->device_name );
 905
 906         if (sanity_check(info, tty->name, "hangup"))
 907                 return;
 908
 909         flush_buffer(tty);
 910         shutdown(info);
 911
 912         info->count = 0;
 913         info->flags &= ~ASYNC_NORMAL_ACTIVE;
 914         info->tty = NULL;
 915
 916         wake_up_interruptible(&info->open_wait);
 917 }
 918
 919 /* Set new termios settings
 920  */
 921 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 922 {
 923         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 924         unsigned long flags;
 925
 926         if (debug_level >= DEBUG_LEVEL_INFO)
 927                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
 928                         tty->driver->name );
 929
 930         /* just return if nothing has changed */
 931         if ((tty->termios->c_cflag == old_termios->c_cflag)
 932             && (RELEVANT_IFLAG(tty->termios->c_iflag)
 933                 == RELEVANT_IFLAG(old_termios->c_iflag)))
 934           return;
 935
 936         change_params(info);
 937
 938         /* Handle transition to B0 status */
 939         if (old_termios->c_cflag & CBAUD &&
 940             !(tty->termios->c_cflag & CBAUD)) {
 941                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
 942                 spin_lock_irqsave(&info->lock,flags);
 943                 set_signals(info);
 944                 spin_unlock_irqrestore(&info->lock,flags);
 945         }
 946
 947         /* Handle transition away from B0 status */
 948         if (!(old_termios->c_cflag & CBAUD) &&
 949             tty->termios->c_cflag & CBAUD) {
 950                 info->serial_signals |= SerialSignal_DTR;
 951                 if (!(tty->termios->c_cflag & CRTSCTS) ||
 952                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 953                         info->serial_signals |= SerialSignal_RTS;
 954                 }
 955                 spin_lock_irqsave(&info->lock,flags);
 956                 set_signals(info);
 957                 spin_unlock_irqrestore(&info->lock,flags);
 958         }
 959
 960         /* Handle turning off CRTSCTS */
 961         if (old_termios->c_cflag & CRTSCTS &&
 962             !(tty->termios->c_cflag & CRTSCTS)) {
 963                 tty->hw_stopped = 0;
 964                 tx_release(tty);
 965         }
 966 }
 967
 968 /* Send a block of data
 969  *
 970  * Arguments:
 971  *
 972  *      tty             pointer to tty information structure
 973  *      buf             pointer to buffer containing send data
 974  *      count           size of send data in bytes
 975  *
 976  * Return Value:        number of characters written
 977  */
 978 static int write(struct tty_struct *tty,
 979                  const unsigned char *buf, int count)
 980 {
 981         int     c, ret = 0;
 982         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 983         unsigned long flags;
 984
 985         if (debug_level >= DEBUG_LEVEL_INFO)
 986                 printk("%s(%d):%s write() count=%d\n",
 987                        __FILE__,__LINE__,info->device_name,count);
 988
 989         if (sanity_check(info, tty->name, "write"))
 990                 goto cleanup;
 991
 992         if (!info->tx_buf)
 993                 goto cleanup;
 994
 995         if (info->params.mode == MGSL_MODE_HDLC) {
 996                 if (count > info->max_frame_size) {
 997                         ret = -EIO;
 998                         goto cleanup;
 999                 }
1000                 if (info->tx_active)
1001                         goto cleanup;
1002                 if (info->tx_count) {
1003                         /* send accumulated data from send_char() calls */
1004                         /* as frame and wait before accepting more data. */
1005                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1006                         goto start;
1007                 }
1008                 ret = info->tx_count = count;
1009                 tx_load_dma_buffer(info, buf, count);
1010                 goto start;
1011         }
1012
1013         for (;;) {
1014                 c = min_t(int, count,
1015                         min(info->max_frame_size - info->tx_count - 1,
1016                             info->max_frame_size - info->tx_put));
1017                 if (c <= 0)
1018                         break;
1019
1020                 memcpy(info->tx_buf + info->tx_put, buf, c);
1021
1022                 spin_lock_irqsave(&info->lock,flags);
1023                 info->tx_put += c;
1024                 if (info->tx_put >= info->max_frame_size)
1025                         info->tx_put -= info->max_frame_size;
1026                 info->tx_count += c;
1027                 spin_unlock_irqrestore(&info->lock,flags);
1028
1029                 buf += c;
1030                 count -= c;
1031                 ret += c;
1032         }
1033
1034         if (info->params.mode == MGSL_MODE_HDLC) {
1035                 if (count) {
1036                         ret = info->tx_count = 0;
1037                         goto cleanup;
1038                 }
1039                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1040         }
1041 start:
1042         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1043                 spin_lock_irqsave(&info->lock,flags);
1044                 if (!info->tx_active)
1045                         tx_start(info);
1046                 spin_unlock_irqrestore(&info->lock,flags);
1047         }
1048
1049 cleanup:
1050         if (debug_level >= DEBUG_LEVEL_INFO)
1051                 printk( "%s(%d):%s write() returning=%d\n",
1052                         __FILE__,__LINE__,info->device_name,ret);
1053         return ret;
1054 }
1055
1056 /* Add a character to the transmit buffer.
1057  */
1058 static void put_char(struct tty_struct *tty, unsigned char ch)
1059 {
1060         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1061         unsigned long flags;
1062
1063         if ( debug_level >= DEBUG_LEVEL_INFO ) {
1064                 printk( "%s(%d):%s put_char(%d)\n",
1065                         __FILE__,__LINE__,info->device_name,ch);
1066         }
1067
1068         if (sanity_check(info, tty->name, "put_char"))
1069                 return;
1070
1071         if (!info->tx_buf)
1072                 return;
1073
1074         spin_lock_irqsave(&info->lock,flags);
1075
1076         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1077              !info->tx_active ) {
1078
1079                 if (info->tx_count < info->max_frame_size - 1) {
1080                         info->tx_buf[info->tx_put++] = ch;
1081                         if (info->tx_put >= info->max_frame_size)
1082                                 info->tx_put -= info->max_frame_size;
1083                         info->tx_count++;
1084                 }
1085         }
1086
1087         spin_unlock_irqrestore(&info->lock,flags);
1088 }
1089
1090 /* Send a high-priority XON/XOFF character
1091  */
1092 static void send_xchar(struct tty_struct *tty, char ch)
1093 {
1094         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1095         unsigned long flags;
1096
1097         if (debug_level >= DEBUG_LEVEL_INFO)
1098                 printk("%s(%d):%s send_xchar(%d)\n",
1099                          __FILE__,__LINE__, info->device_name, ch );
1100
1101         if (sanity_check(info, tty->name, "send_xchar"))
1102                 return;
1103
1104         info->x_char = ch;
1105         if (ch) {
1106                 /* Make sure transmit interrupts are on */
1107                 spin_lock_irqsave(&info->lock,flags);
1108                 if (!info->tx_enabled)
1109                         tx_start(info);
1110                 spin_unlock_irqrestore(&info->lock,flags);
1111         }
1112 }
1113
1114 /* Wait until the transmitter is empty.
1115  */
1116 static void wait_until_sent(struct tty_struct *tty, int timeout)
1117 {
1118         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1119         unsigned long orig_jiffies, char_time;
1120
1121         if (!info )
1122                 return;
1123
1124         if (debug_level >= DEBUG_LEVEL_INFO)
1125                 printk("%s(%d):%s wait_until_sent() entry\n",
1126                          __FILE__,__LINE__, info->device_name );
1127
1128         if (sanity_check(info, tty->name, "wait_until_sent"))
1129                 return;
1130
1131         if (!(info->flags & ASYNC_INITIALIZED))
1132                 goto exit;
1133
1134         orig_jiffies = jiffies;
1135
1136         /* Set check interval to 1/5 of estimated time to
1137          * send a character, and make it at least 1. The check
1138          * interval should also be less than the timeout.
1139          * Note: use tight timings here to satisfy the NIST-PCTS.
1140          */
1141
1142         if ( info->params.data_rate ) {
1143                 char_time = info->timeout/(32 * 5);
1144                 if (!char_time)
1145                         char_time++;
1146         } else
1147                 char_time = 1;
1148
1149         if (timeout)
1150                 char_time = min_t(unsigned long, char_time, timeout);
1151
1152         if ( info->params.mode == MGSL_MODE_HDLC ) {
1153                 while (info->tx_active) {
1154                         msleep_interruptible(jiffies_to_msecs(char_time));
1155                         if (signal_pending(current))
1156                                 break;
1157                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1158                                 break;
1159                 }
1160         } else {
1161                 //TODO: determine if there is something similar to USC16C32
1162                 //      TXSTATUS_ALL_SENT status
1163                 while ( info->tx_active && info->tx_enabled) {
1164                         msleep_interruptible(jiffies_to_msecs(char_time));
1165                         if (signal_pending(current))
1166                                 break;
1167                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1168                                 break;
1169                 }
1170         }
1171
1172 exit:
1173         if (debug_level >= DEBUG_LEVEL_INFO)
1174                 printk("%s(%d):%s wait_until_sent() exit\n",
1175                          __FILE__,__LINE__, info->device_name );
1176 }
1177
1178 /* Return the count of free bytes in transmit buffer
1179  */
1180 static int write_room(struct tty_struct *tty)
1181 {
1182         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1183         int ret;
1184
1185         if (sanity_check(info, tty->name, "write_room"))
1186                 return 0;
1187
1188         if (info->params.mode == MGSL_MODE_HDLC) {
1189                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1190         } else {
1191                 ret = info->max_frame_size - info->tx_count - 1;
1192                 if (ret < 0)
1193                         ret = 0;
1194         }
1195
1196         if (debug_level >= DEBUG_LEVEL_INFO)
1197                 printk("%s(%d):%s write_room()=%d\n",
1198                        __FILE__, __LINE__, info->device_name, ret);
1199
1200         return ret;
1201 }
1202
1203 /* enable transmitter and send remaining buffered characters
1204  */
1205 static void flush_chars(struct tty_struct *tty)
1206 {
1207         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1208         unsigned long flags;
1209
1210         if ( debug_level >= DEBUG_LEVEL_INFO )
1211                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1212                         __FILE__,__LINE__,info->device_name,info->tx_count);
1213
1214         if (sanity_check(info, tty->name, "flush_chars"))
1215                 return;
1216
1217         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1218             !info->tx_buf)
1219                 return;
1220
1221         if ( debug_level >= DEBUG_LEVEL_INFO )
1222                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1223                         __FILE__,__LINE__,info->device_name );
1224
1225         spin_lock_irqsave(&info->lock,flags);
1226
1227         if (!info->tx_active) {
1228                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1229                         info->tx_count ) {
1230                         /* operating in synchronous (frame oriented) mode */
1231                         /* copy data from circular tx_buf to */
1232                         /* transmit DMA buffer. */
1233                         tx_load_dma_buffer(info,
1234                                  info->tx_buf,info->tx_count);
1235                 }
1236                 tx_start(info);
1237         }
1238
1239         spin_unlock_irqrestore(&info->lock,flags);
1240 }
1241
1242 /* Discard all data in the send buffer
1243  */
1244 static void flush_buffer(struct tty_struct *tty)
1245 {
1246         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1247         unsigned long flags;
1248
1249         if (debug_level >= DEBUG_LEVEL_INFO)
1250                 printk("%s(%d):%s flush_buffer() entry\n",
1251                          __FILE__,__LINE__, info->device_name );
1252
1253         if (sanity_check(info, tty->name, "flush_buffer"))
1254                 return;
1255
1256         spin_lock_irqsave(&info->lock,flags);
1257         info->tx_count = info->tx_put = info->tx_get = 0;
1258         del_timer(&info->tx_timer);
1259         spin_unlock_irqrestore(&info->lock,flags);
1260
1261         wake_up_interruptible(&tty->write_wait);
1262         tty_wakeup(tty);
1263 }
1264
1265 /* throttle (stop) transmitter
1266  */
1267 static void tx_hold(struct tty_struct *tty)
1268 {
1269         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1270         unsigned long flags;
1271
1272         if (sanity_check(info, tty->name, "tx_hold"))
1273                 return;
1274
1275         if ( debug_level >= DEBUG_LEVEL_INFO )
1276                 printk("%s(%d):%s tx_hold()\n",
1277                         __FILE__,__LINE__,info->device_name);
1278
1279         spin_lock_irqsave(&info->lock,flags);
1280         if (info->tx_enabled)
1281                 tx_stop(info);
1282         spin_unlock_irqrestore(&info->lock,flags);
1283 }
1284
1285 /* release (start) transmitter
1286  */
1287 static void tx_release(struct tty_struct *tty)
1288 {
1289         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1290         unsigned long flags;
1291
1292         if (sanity_check(info, tty->name, "tx_release"))
1293                 return;
1294
1295         if ( debug_level >= DEBUG_LEVEL_INFO )
1296                 printk("%s(%d):%s tx_release()\n",
1297                         __FILE__,__LINE__,info->device_name);
1298
1299         spin_lock_irqsave(&info->lock,flags);
1300         if (!info->tx_enabled)
1301                 tx_start(info);
1302         spin_unlock_irqrestore(&info->lock,flags);
1303 }
1304
1305 /* Service an IOCTL request
1306  *
1307  * Arguments:
1308  *
1309  *      tty     pointer to tty instance data
1310  *      file    pointer to associated file object for device
1311  *      cmd     IOCTL command code
1312  *      arg     command argument/context
1313  *
1314  * Return Value:        0 if success, otherwise error code
1315  */
1316 static int ioctl(struct tty_struct *tty, struct file *file,
1317                  unsigned int cmd, unsigned long arg)
1318 {
1319         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1320         int error;
1321         struct mgsl_icount cnow;        /* kernel counter temps */
1322         struct serial_icounter_struct __user *p_cuser;  /* user space */
1323         unsigned long flags;
1324         void __user *argp = (void __user *)arg;
1325
1326         if (debug_level >= DEBUG_LEVEL_INFO)
1327                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1328                         info->device_name, cmd );
1329
1330         if (sanity_check(info, tty->name, "ioctl"))
1331                 return -ENODEV;
1332
1333         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1334             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1335                 if (tty->flags & (1 << TTY_IO_ERROR))
1336                     return -EIO;
1337         }
1338
1339         switch (cmd) {
1340         case MGSL_IOCGPARAMS:
1341                 return get_params(info, argp);
1342         case MGSL_IOCSPARAMS:
1343                 return set_params(info, argp);
1344         case MGSL_IOCGTXIDLE:
1345                 return get_txidle(info, argp);
1346         case MGSL_IOCSTXIDLE:
1347                 return set_txidle(info, (int)arg);
1348         case MGSL_IOCTXENABLE:
1349                 return tx_enable(info, (int)arg);
1350         case MGSL_IOCRXENABLE:
1351                 return rx_enable(info, (int)arg);
1352         case MGSL_IOCTXABORT:
1353                 return tx_abort(info);
1354         case MGSL_IOCGSTATS:
1355                 return get_stats(info, argp);
1356         case MGSL_IOCWAITEVENT:
1357                 return wait_mgsl_event(info, argp);
1358         case MGSL_IOCLOOPTXDONE:
1359                 return 0; // TODO: Not supported, need to document
1360                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1361                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1362                  */
1363         case TIOCMIWAIT:
1364                 return modem_input_wait(info,(int)arg);
1365
1366                 /*
1367                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1368                  * Return: write counters to the user passed counter struct
1369                  * NB: both 1->0 and 0->1 transitions are counted except for
1370                  *     RI where only 0->1 is counted.
1371                  */
1372         case TIOCGICOUNT:
1373                 spin_lock_irqsave(&info->lock,flags);
1374                 cnow = info->icount;
1375                 spin_unlock_irqrestore(&info->lock,flags);
1376                 p_cuser = argp;
1377                 PUT_USER(error,cnow.cts, &p_cuser->cts);
1378                 if (error) return error;
1379                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
1380                 if (error) return error;
1381                 PUT_USER(error,cnow.rng, &p_cuser->rng);
1382                 if (error) return error;
1383                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
1384                 if (error) return error;
1385                 PUT_USER(error,cnow.rx, &p_cuser->rx);
1386                 if (error) return error;
1387                 PUT_USER(error,cnow.tx, &p_cuser->tx);
1388                 if (error) return error;
1389                 PUT_USER(error,cnow.frame, &p_cuser->frame);
1390                 if (error) return error;
1391                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
1392                 if (error) return error;
1393                 PUT_USER(error,cnow.parity, &p_cuser->parity);
1394                 if (error) return error;
1395                 PUT_USER(error,cnow.brk, &p_cuser->brk);
1396                 if (error) return error;
1397                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
1398                 if (error) return error;
1399                 return 0;
1400         default:
1401                 return -ENOIOCTLCMD;
1402         }
1403         return 0;
1404 }
1405
1406 /*
1407  * /proc fs routines....
1408  */
1409
1410 static inline int line_info(char *buf, SLMP_INFO *info)
1411 {
1412         char    stat_buf[30];
1413         int     ret;
1414         unsigned long flags;
1415
1416         ret = sprintf(buf, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1417                        "\tIRQ=%d MaxFrameSize=%u\n",
1418                 info->device_name,
1419                 info->phys_sca_base,
1420                 info->phys_memory_base,
1421                 info->phys_statctrl_base,
1422                 info->phys_lcr_base,
1423                 info->irq_level,
1424                 info->max_frame_size );
1425
1426         /* output current serial signal states */
1427         spin_lock_irqsave(&info->lock,flags);
1428         get_signals(info);
1429         spin_unlock_irqrestore(&info->lock,flags);
1430
1431         stat_buf[0] = 0;
1432         stat_buf[1] = 0;
1433         if (info->serial_signals & SerialSignal_RTS)
1434                 strcat(stat_buf, "|RTS");
1435         if (info->serial_signals & SerialSignal_CTS)
1436                 strcat(stat_buf, "|CTS");
1437         if (info->serial_signals & SerialSignal_DTR)
1438                 strcat(stat_buf, "|DTR");
1439         if (info->serial_signals & SerialSignal_DSR)
1440                 strcat(stat_buf, "|DSR");
1441         if (info->serial_signals & SerialSignal_DCD)
1442                 strcat(stat_buf, "|CD");
1443         if (info->serial_signals & SerialSignal_RI)
1444                 strcat(stat_buf, "|RI");
1445
1446         if (info->params.mode == MGSL_MODE_HDLC) {
1447                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1448                               info->icount.txok, info->icount.rxok);
1449                 if (info->icount.txunder)
1450                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1451                 if (info->icount.txabort)
1452                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1453                 if (info->icount.rxshort)
1454                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1455                 if (info->icount.rxlong)
1456                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1457                 if (info->icount.rxover)
1458                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1459                 if (info->icount.rxcrc)
1460                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc);
1461         } else {
1462                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1463                               info->icount.tx, info->icount.rx);
1464                 if (info->icount.frame)
1465                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1466                 if (info->icount.parity)
1467                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1468                 if (info->icount.brk)
1469                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1470                 if (info->icount.overrun)
1471                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1472         }
1473
1474         /* Append serial signal status to end */
1475         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1476
1477         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1478          info->tx_active,info->bh_requested,info->bh_running,
1479          info->pending_bh);
1480
1481         return ret;
1482 }
1483
1484 /* Called to print information about devices
1485  */
1486 int read_proc(char *page, char **start, off_t off, int count,
1487               int *eof, void *data)
1488 {
1489         int len = 0, l;
1490         off_t   begin = 0;
1491         SLMP_INFO *info;
1492
1493         len += sprintf(page, "synclinkmp driver:%s\n", driver_version);
1494
1495         info = synclinkmp_device_list;
1496         while( info ) {
1497                 l = line_info(page + len, info);
1498                 len += l;
1499                 if (len+begin > off+count)
1500                         goto done;
1501                 if (len+begin < off) {
1502                         begin += len;
1503                         len = 0;
1504                 }
1505                 info = info->next_device;
1506         }
1507
1508         *eof = 1;
1509 done:
1510         if (off >= len+begin)
1511                 return 0;
1512         *start = page + (off-begin);
1513         return ((count < begin+len-off) ? count : begin+len-off);
1514 }
1515
1516 /* Return the count of bytes in transmit buffer
1517  */
1518 static int chars_in_buffer(struct tty_struct *tty)
1519 {
1520         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1521
1522         if (sanity_check(info, tty->name, "chars_in_buffer"))
1523                 return 0;
1524
1525         if (debug_level >= DEBUG_LEVEL_INFO)
1526                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1527                        __FILE__, __LINE__, info->device_name, info->tx_count);
1528
1529         return info->tx_count;
1530 }
1531
1532 /* Signal remote device to throttle send data (our receive data)
1533  */
1534 static void throttle(struct tty_struct * tty)
1535 {
1536         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1537         unsigned long flags;
1538
1539         if (debug_level >= DEBUG_LEVEL_INFO)
1540                 printk("%s(%d):%s throttle() entry\n",
1541                          __FILE__,__LINE__, info->device_name );
1542
1543         if (sanity_check(info, tty->name, "throttle"))
1544                 return;
1545
1546         if (I_IXOFF(tty))
1547                 send_xchar(tty, STOP_CHAR(tty));
1548
1549         if (tty->termios->c_cflag & CRTSCTS) {
1550                 spin_lock_irqsave(&info->lock,flags);
1551                 info->serial_signals &= ~SerialSignal_RTS;
1552                 set_signals(info);
1553                 spin_unlock_irqrestore(&info->lock,flags);
1554         }
1555 }
1556
1557 /* Signal remote device to stop throttling send data (our receive data)
1558  */
1559 static void unthrottle(struct tty_struct * tty)
1560 {
1561         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1562         unsigned long flags;
1563
1564         if (debug_level >= DEBUG_LEVEL_INFO)
1565                 printk("%s(%d):%s unthrottle() entry\n",
1566                          __FILE__,__LINE__, info->device_name );
1567
1568         if (sanity_check(info, tty->name, "unthrottle"))
1569                 return;
1570
1571         if (I_IXOFF(tty)) {
1572                 if (info->x_char)
1573                         info->x_char = 0;
1574                 else
1575                         send_xchar(tty, START_CHAR(tty));
1576         }
1577
1578         if (tty->termios->c_cflag & CRTSCTS) {
1579                 spin_lock_irqsave(&info->lock,flags);
1580                 info->serial_signals |= SerialSignal_RTS;
1581                 set_signals(info);
1582                 spin_unlock_irqrestore(&info->lock,flags);
1583         }
1584 }
1585
1586 /* set or clear transmit break condition
1587  * break_state  -1=set break condition, 0=clear
1588  */
1589 static void set_break(struct tty_struct *tty, int break_state)
1590 {
1591         unsigned char RegValue;
1592         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1593         unsigned long flags;
1594
1595         if (debug_level >= DEBUG_LEVEL_INFO)
1596                 printk("%s(%d):%s set_break(%d)\n",
1597                          __FILE__,__LINE__, info->device_name, break_state);
1598
1599         if (sanity_check(info, tty->name, "set_break"))
1600                 return;
1601
1602         spin_lock_irqsave(&info->lock,flags);
1603         RegValue = read_reg(info, CTL);
1604         if (break_state == -1)
1605                 RegValue |= BIT3;
1606         else
1607                 RegValue &= ~BIT3;
1608         write_reg(info, CTL, RegValue);
1609         spin_unlock_irqrestore(&info->lock,flags);
1610 }
1611
1612 #if SYNCLINK_GENERIC_HDLC
1613
1614 /**
1615  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1616  * set encoding and frame check sequence (FCS) options
1617  *
1618  * dev       pointer to network device structure
1619  * encoding  serial encoding setting
1620  * parity    FCS setting
1621  *
1622  * returns 0 if success, otherwise error code
1623  */
1624 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1625                           unsigned short parity)
1626 {
1627         SLMP_INFO *info = dev_to_port(dev);
1628         unsigned char  new_encoding;
1629         unsigned short new_crctype;
1630
1631         /* return error if TTY interface open */
1632         if (info->count)
1633                 return -EBUSY;
1634
1635         switch (encoding)
1636         {
1637         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1638         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1639         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1640         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1641         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1642         default: return -EINVAL;
1643         }
1644
1645         switch (parity)
1646         {
1647         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1648         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1649         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1650         default: return -EINVAL;
1651         }
1652
1653         info->params.encoding = new_encoding;
1654         info->params.crc_type = new_crctype;
1655
1656         /* if network interface up, reprogram hardware */
1657         if (info->netcount)
1658                 program_hw(info);
1659
1660         return 0;
1661 }
1662
1663 /**
1664  * called by generic HDLC layer to send frame
1665  *
1666  * skb  socket buffer containing HDLC frame
1667  * dev  pointer to network device structure
1668  *
1669  * returns 0 if success, otherwise error code
1670  */
1671 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1672 {
1673         SLMP_INFO *info = dev_to_port(dev);
1674         struct net_device_stats *stats = hdlc_stats(dev);
1675         unsigned long flags;
1676
1677         if (debug_level >= DEBUG_LEVEL_INFO)
1678                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1679
1680         /* stop sending until this frame completes */
1681         netif_stop_queue(dev);
1682
1683         /* copy data to device buffers */
1684         info->tx_count = skb->len;
1685         tx_load_dma_buffer(info, skb->data, skb->len);
1686
1687         /* update network statistics */
1688         stats->tx_packets++;
1689         stats->tx_bytes += skb->len;
1690
1691         /* done with socket buffer, so free it */
1692         dev_kfree_skb(skb);
1693
1694         /* save start time for transmit timeout detection */
1695         dev->trans_start = jiffies;
1696
1697         /* start hardware transmitter if necessary */
1698         spin_lock_irqsave(&info->lock,flags);
1699         if (!info->tx_active)
1700                 tx_start(info);
1701         spin_unlock_irqrestore(&info->lock,flags);
1702
1703         return 0;
1704 }
1705
1706 /**
1707  * called by network layer when interface enabled
1708  * claim resources and initialize hardware
1709  *
1710  * dev  pointer to network device structure
1711  *
1712  * returns 0 if success, otherwise error code
1713  */
1714 static int hdlcdev_open(struct net_device *dev)
1715 {
1716         SLMP_INFO *info = dev_to_port(dev);
1717         int rc;
1718         unsigned long flags;
1719
1720         if (debug_level >= DEBUG_LEVEL_INFO)
1721                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1722
1723         /* generic HDLC layer open processing */
1724         if ((rc = hdlc_open(dev)))
1725                 return rc;
1726
1727         /* arbitrate between network and tty opens */
1728         spin_lock_irqsave(&info->netlock, flags);
1729         if (info->count != 0 || info->netcount != 0) {
1730                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1731                 spin_unlock_irqrestore(&info->netlock, flags);
1732                 return -EBUSY;
1733         }
1734         info->netcount=1;
1735         spin_unlock_irqrestore(&info->netlock, flags);
1736
1737         /* claim resources and init adapter */
1738         if ((rc = startup(info)) != 0) {
1739                 spin_lock_irqsave(&info->netlock, flags);
1740                 info->netcount=0;
1741                 spin_unlock_irqrestore(&info->netlock, flags);
1742                 return rc;
1743         }
1744
1745         /* assert DTR and RTS, apply hardware settings */
1746         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1747         program_hw(info);
1748
1749         /* enable network layer transmit */
1750         dev->trans_start = jiffies;
1751         netif_start_queue(dev);
1752
1753         /* inform generic HDLC layer of current DCD status */
1754         spin_lock_irqsave(&info->lock, flags);
1755         get_signals(info);
1756         spin_unlock_irqrestore(&info->lock, flags);
1757         if (info->serial_signals & SerialSignal_DCD)
1758                 netif_carrier_on(dev);
1759         else
1760                 netif_carrier_off(dev);
1761         return 0;
1762 }
1763
1764 /**
1765  * called by network layer when interface is disabled
1766  * shutdown hardware and release resources
1767  *
1768  * dev  pointer to network device structure
1769  *
1770  * returns 0 if success, otherwise error code
1771  */
1772 static int hdlcdev_close(struct net_device *dev)
1773 {
1774         SLMP_INFO *info = dev_to_port(dev);
1775         unsigned long flags;
1776
1777         if (debug_level >= DEBUG_LEVEL_INFO)
1778                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1779
1780         netif_stop_queue(dev);
1781
1782         /* shutdown adapter and release resources */
1783         shutdown(info);
1784
1785         hdlc_close(dev);
1786
1787         spin_lock_irqsave(&info->netlock, flags);
1788         info->netcount=0;
1789         spin_unlock_irqrestore(&info->netlock, flags);
1790
1791         return 0;
1792 }
1793
1794 /**
1795  * called by network layer to process IOCTL call to network device
1796  *
1797  * dev  pointer to network device structure
1798  * ifr  pointer to network interface request structure
1799  * cmd  IOCTL command code
1800  *
1801  * returns 0 if success, otherwise error code
1802  */
1803 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1804 {
1805         const size_t size = sizeof(sync_serial_settings);
1806         sync_serial_settings new_line;
1807         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1808         SLMP_INFO *info = dev_to_port(dev);
1809         unsigned int flags;
1810
1811         if (debug_level >= DEBUG_LEVEL_INFO)
1812                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1813
1814         /* return error if TTY interface open */
1815         if (info->count)
1816                 return -EBUSY;
1817
1818         if (cmd != SIOCWANDEV)
1819                 return hdlc_ioctl(dev, ifr, cmd);
1820
1821         switch(ifr->ifr_settings.type) {
1822         case IF_GET_IFACE: /* return current sync_serial_settings */
1823
1824                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1825                 if (ifr->ifr_settings.size < size) {
1826                         ifr->ifr_settings.size = size; /* data size wanted */
1827                         return -ENOBUFS;
1828                 }
1829
1830                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1831                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1832                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1833                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1834
1835                 switch (flags){
1836                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1837                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1838                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1839                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1840                 default: new_line.clock_type = CLOCK_DEFAULT;
1841                 }
1842
1843                 new_line.clock_rate = info->params.clock_speed;
1844                 new_line.loopback   = info->params.loopback ? 1:0;
1845
1846                 if (copy_to_user(line, &new_line, size))
1847                         return -EFAULT;
1848                 return 0;
1849
1850         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1851
1852                 if(!capable(CAP_NET_ADMIN))
1853                         return -EPERM;
1854                 if (copy_from_user(&new_line, line, size))
1855                         return -EFAULT;
1856
1857                 switch (new_line.clock_type)
1858                 {
1859                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1860                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1861                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1862                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1863                 case CLOCK_DEFAULT:  flags = info->params.flags &
1864                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1865                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1866                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1867                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1868                 default: return -EINVAL;
1869                 }
1870
1871                 if (new_line.loopback != 0 && new_line.loopback != 1)
1872                         return -EINVAL;
1873
1874                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1875                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1876                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1877                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1878                 info->params.flags |= flags;
1879
1880                 info->params.loopback = new_line.loopback;
1881
1882                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1883                         info->params.clock_speed = new_line.clock_rate;
1884                 else
1885                         info->params.clock_speed = 0;
1886
1887                 /* if network interface up, reprogram hardware */
1888                 if (info->netcount)
1889                         program_hw(info);
1890                 return 0;
1891
1892         default:
1893                 return hdlc_ioctl(dev, ifr, cmd);
1894         }
1895 }
1896
1897 /**
1898  * called by network layer when transmit timeout is detected
1899  *
1900  * dev  pointer to network device structure
1901  */
1902 static void hdlcdev_tx_timeout(struct net_device *dev)
1903 {
1904         SLMP_INFO *info = dev_to_port(dev);
1905         struct net_device_stats *stats = hdlc_stats(dev);
1906         unsigned long flags;
1907
1908         if (debug_level >= DEBUG_LEVEL_INFO)
1909                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1910
1911         stats->tx_errors++;
1912         stats->tx_aborted_errors++;
1913
1914         spin_lock_irqsave(&info->lock,flags);
1915         tx_stop(info);
1916         spin_unlock_irqrestore(&info->lock,flags);
1917
1918         netif_wake_queue(dev);
1919 }
1920
1921 /**
1922  * called by device driver when transmit completes
1923  * reenable network layer transmit if stopped
1924  *
1925  * info  pointer to device instance information
1926  */
1927 static void hdlcdev_tx_done(SLMP_INFO *info)
1928 {
1929         if (netif_queue_stopped(info->netdev))
1930                 netif_wake_queue(info->netdev);
1931 }
1932
1933 /**
1934  * called by device driver when frame received
1935  * pass frame to network layer
1936  *
1937  * info  pointer to device instance information
1938  * buf   pointer to buffer contianing frame data
1939  * size  count of data bytes in buf
1940  */
1941 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1942 {
1943         struct sk_buff *skb = dev_alloc_skb(size);
1944         struct net_device *dev = info->netdev;
1945         struct net_device_stats *stats = hdlc_stats(dev);
1946
1947         if (debug_level >= DEBUG_LEVEL_INFO)
1948                 printk("hdlcdev_rx(%s)\n",dev->name);
1949
1950         if (skb == NULL) {
1951                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
1952                 stats->rx_dropped++;
1953                 return;
1954         }
1955
1956         memcpy(skb_put(skb, size),buf,size);
1957
1958         skb->protocol = hdlc_type_trans(skb, info->netdev);
1959
1960         stats->rx_packets++;
1961         stats->rx_bytes += size;
1962
1963         netif_rx(skb);
1964
1965         info->netdev->last_rx = jiffies;
1966 }
1967
1968 /**
1969  * called by device driver when adding device instance
1970  * do generic HDLC initialization
1971  *
1972  * info  pointer to device instance information
1973  *
1974  * returns 0 if success, otherwise error code
1975  */
1976 static int hdlcdev_init(SLMP_INFO *info)
1977 {
1978         int rc;
1979         struct net_device *dev;
1980         hdlc_device *hdlc;
1981
1982         /* allocate and initialize network and HDLC layer objects */
1983
1984         if (!(dev = alloc_hdlcdev(info))) {
1985                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1986                 return -ENOMEM;
1987         }
1988
1989         /* for network layer reporting purposes only */
1990         dev->mem_start = info->phys_sca_base;
1991         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1992         dev->irq       = info->irq_level;
1993
1994         /* network layer callbacks and settings */
1995         dev->do_ioctl       = hdlcdev_ioctl;
1996         dev->open           = hdlcdev_open;
1997         dev->stop           = hdlcdev_close;
1998         dev->tx_timeout     = hdlcdev_tx_timeout;
1999         dev->watchdog_timeo = 10*HZ;
2000         dev->tx_queue_len   = 50;
2001
2002         /* generic HDLC layer callbacks and settings */
2003         hdlc         = dev_to_hdlc(dev);
2004         hdlc->attach = hdlcdev_attach;
2005         hdlc->xmit   = hdlcdev_xmit;
2006
2007         /* register objects with HDLC layer */
2008         if ((rc = register_hdlc_device(dev))) {
2009                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
2010                 free_netdev(dev);
2011                 return rc;
2012         }
2013
2014         info->netdev = dev;
2015         return 0;
2016 }
2017
2018 /**
2019  * called by device driver when removing device instance
2020  * do generic HDLC cleanup
2021  *
2022  * info  pointer to device instance information
2023  */
2024 static void hdlcdev_exit(SLMP_INFO *info)
2025 {
2026         unregister_hdlc_device(info->netdev);
2027         free_netdev(info->netdev);
2028         info->netdev = NULL;
2029 }
2030
2031 #endif /* CONFIG_HDLC */
2032
2033
2034 /* Return next bottom half action to perform.
2035  * Return Value:        BH action code or 0 if nothing to do.
2036  */
2037 int bh_action(SLMP_INFO *info)
2038 {
2039         unsigned long flags;
2040         int rc = 0;
2041
2042         spin_lock_irqsave(&info->lock,flags);
2043
2044         if (info->pending_bh & BH_RECEIVE) {
2045                 info->pending_bh &= ~BH_RECEIVE;
2046                 rc = BH_RECEIVE;
2047         } else if (info->pending_bh & BH_TRANSMIT) {
2048                 info->pending_bh &= ~BH_TRANSMIT;
2049                 rc = BH_TRANSMIT;
2050         } else if (info->pending_bh & BH_STATUS) {
2051                 info->pending_bh &= ~BH_STATUS;
2052                 rc = BH_STATUS;
2053         }
2054
2055         if (!rc) {
2056                 /* Mark BH routine as complete */
2057                 info->bh_running   = 0;
2058                 info->bh_requested = 0;
2059         }
2060
2061         spin_unlock_irqrestore(&info->lock,flags);
2062
2063         return rc;
2064 }
2065
2066 /* Perform bottom half processing of work items queued by ISR.
2067  */
2068 void bh_handler(struct work_struct *work)
2069 {
2070         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2071         int action;
2072
2073         if (!info)
2074                 return;
2075
2076         if ( debug_level >= DEBUG_LEVEL_BH )
2077                 printk( "%s(%d):%s bh_handler() entry\n",
2078                         __FILE__,__LINE__,info->device_name);
2079
2080         info->bh_running = 1;
2081
2082         while((action = bh_action(info)) != 0) {
2083
2084                 /* Process work item */
2085                 if ( debug_level >= DEBUG_LEVEL_BH )
2086                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2087                                 __FILE__,__LINE__,info->device_name, action);
2088
2089                 switch (action) {
2090
2091                 case BH_RECEIVE:
2092                         bh_receive(info);
2093                         break;
2094                 case BH_TRANSMIT:
2095                         bh_transmit(info);
2096                         break;
2097                 case BH_STATUS:
2098                         bh_status(info);
2099                         break;
2100                 default:
2101                         /* unknown work item ID */
2102                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2103                                 __FILE__,__LINE__,info->device_name,action);
2104                         break;
2105                 }
2106         }
2107
2108         if ( debug_level >= DEBUG_LEVEL_BH )
2109                 printk( "%s(%d):%s bh_handler() exit\n",
2110                         __FILE__,__LINE__,info->device_name);
2111 }
2112
2113 void bh_receive(SLMP_INFO *info)
2114 {
2115         if ( debug_level >= DEBUG_LEVEL_BH )
2116                 printk( "%s(%d):%s bh_receive()\n",
2117                         __FILE__,__LINE__,info->device_name);
2118
2119         while( rx_get_frame(info) );
2120 }
2121
2122 void bh_transmit(SLMP_INFO *info)
2123 {
2124         struct tty_struct *tty = info->tty;
2125
2126         if ( debug_level >= DEBUG_LEVEL_BH )
2127                 printk( "%s(%d):%s bh_transmit() entry\n",
2128                         __FILE__,__LINE__,info->device_name);
2129
2130         if (tty) {
2131                 tty_wakeup(tty);
2132                 wake_up_interruptible(&tty->write_wait);
2133         }
2134 }
2135
2136 void bh_status(SLMP_INFO *info)
2137 {
2138         if ( debug_level >= DEBUG_LEVEL_BH )
2139                 printk( "%s(%d):%s bh_status() entry\n",
2140                         __FILE__,__LINE__,info->device_name);
2141
2142         info->ri_chkcount = 0;
2143         info->dsr_chkcount = 0;
2144         info->dcd_chkcount = 0;
2145         info->cts_chkcount = 0;
2146 }
2147
2148 void isr_timer(SLMP_INFO * info)
2149 {
2150         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2151
2152         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2153         write_reg(info, IER2, 0);
2154
2155         /* TMCS, Timer Control/Status Register
2156          *
2157          * 07      CMF, Compare match flag (read only) 1=match
2158          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2159          * 05      Reserved, must be 0
2160          * 04      TME, Timer Enable
2161          * 03..00  Reserved, must be 0
2162          *
2163          * 0000 0000
2164          */
2165         write_reg(info, (unsigned char)(timer + TMCS), 0);
2166
2167         info->irq_occurred = TRUE;
2168
2169         if ( debug_level >= DEBUG_LEVEL_ISR )
2170                 printk("%s(%d):%s isr_timer()\n",
2171                         __FILE__,__LINE__,info->device_name);
2172 }
2173
2174 void isr_rxint(SLMP_INFO * info)
2175 {
2176         struct tty_struct *tty = info->tty;
2177         struct  mgsl_icount *icount = &info->icount;
2178         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2179         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2180
2181         /* clear status bits */
2182         if (status)
2183                 write_reg(info, SR1, status);
2184
2185         if (status2)
2186                 write_reg(info, SR2, status2);
2187
2188         if ( debug_level >= DEBUG_LEVEL_ISR )
2189                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2190                         __FILE__,__LINE__,info->device_name,status,status2);
2191
2192         if (info->params.mode == MGSL_MODE_ASYNC) {
2193                 if (status & BRKD) {
2194                         icount->brk++;
2195
2196                         /* process break detection if tty control
2197                          * is not set to ignore it
2198                          */
2199                         if ( tty ) {
2200                                 if (!(status & info->ignore_status_mask1)) {
2201                                         if (info->read_status_mask1 & BRKD) {
2202                                                 tty_insert_flip_char(tty, 0, TTY_BREAK);
2203                                                 if (info->flags & ASYNC_SAK)
2204                                                         do_SAK(tty);
2205                                         }
2206                                 }
2207                         }
2208                 }
2209         }
2210         else {
2211                 if (status & (FLGD|IDLD)) {
2212                         if (status & FLGD)
2213                                 info->icount.exithunt++;
2214                         else if (status & IDLD)
2215                                 info->icount.rxidle++;
2216                         wake_up_interruptible(&info->event_wait_q);
2217                 }
2218         }
2219
2220         if (status & CDCD) {
2221                 /* simulate a common modem status change interrupt
2222                  * for our handler
2223                  */
2224                 get_signals( info );
2225                 isr_io_pin(info,
2226                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2227         }
2228 }
2229
2230 /*
2231  * handle async rx data interrupts
2232  */
2233 void isr_rxrdy(SLMP_INFO * info)
2234 {
2235         u16 status;
2236         unsigned char DataByte;
2237         struct tty_struct *tty = info->tty;
2238         struct  mgsl_icount *icount = &info->icount;
2239
2240         if ( debug_level >= DEBUG_LEVEL_ISR )
2241                 printk("%s(%d):%s isr_rxrdy\n",
2242                         __FILE__,__LINE__,info->device_name);
2243
2244         while((status = read_reg(info,CST0)) & BIT0)
2245         {
2246                 int flag = 0;
2247                 int over = 0;
2248                 DataByte = read_reg(info,TRB);
2249
2250                 icount->rx++;
2251
2252                 if ( status & (PE + FRME + OVRN) ) {
2253                         printk("%s(%d):%s rxerr=%04X\n",
2254                                 __FILE__,__LINE__,info->device_name,status);
2255
2256                         /* update error statistics */
2257                         if (status & PE)
2258                                 icount->parity++;
2259                         else if (status & FRME)
2260                                 icount->frame++;
2261                         else if (status & OVRN)
2262                                 icount->overrun++;
2263
2264                         /* discard char if tty control flags say so */
2265                         if (status & info->ignore_status_mask2)
2266                                 continue;
2267
2268                         status &= info->read_status_mask2;
2269
2270                         if ( tty ) {
2271                                 if (status & PE)
2272                                         flag = TTY_PARITY;
2273                                 else if (status & FRME)
2274                                         flag = TTY_FRAME;
2275                                 if (status & OVRN) {
2276                                         /* Overrun is special, since it's
2277                                          * reported immediately, and doesn't
2278                                          * affect the current character
2279                                          */
2280                                         over = 1;
2281                                 }
2282                         }
2283                 }       /* end of if (error) */
2284
2285                 if ( tty ) {
2286                         tty_insert_flip_char(tty, DataByte, flag);
2287                         if (over)
2288                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2289                 }
2290         }
2291
2292         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2293                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2294                         __FILE__,__LINE__,info->device_name,
2295                         icount->rx,icount->brk,icount->parity,
2296                         icount->frame,icount->overrun);
2297         }
2298
2299         if ( tty )
2300                 tty_flip_buffer_push(tty);
2301 }
2302
2303 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2304 {
2305         if ( debug_level >= DEBUG_LEVEL_ISR )
2306                 printk("%s(%d):%s isr_txeom status=%02x\n",
2307                         __FILE__,__LINE__,info->device_name,status);
2308
2309         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2310         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2311         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2312
2313         if (status & UDRN) {
2314                 write_reg(info, CMD, TXRESET);
2315                 write_reg(info, CMD, TXENABLE);
2316         } else
2317                 write_reg(info, CMD, TXBUFCLR);
2318
2319         /* disable and clear tx interrupts */
2320         info->ie0_value &= ~TXRDYE;
2321         info->ie1_value &= ~(IDLE + UDRN);
2322         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2323         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2324
2325         if ( info->tx_active ) {
2326                 if (info->params.mode != MGSL_MODE_ASYNC) {
2327                         if (status & UDRN)
2328                                 info->icount.txunder++;
2329                         else if (status & IDLE)
2330                                 info->icount.txok++;
2331                 }
2332
2333                 info->tx_active = 0;
2334                 info->tx_count = info->tx_put = info->tx_get = 0;
2335
2336                 del_timer(&info->tx_timer);
2337
2338                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2339                         info->serial_signals &= ~SerialSignal_RTS;
2340                         info->drop_rts_on_tx_done = 0;
2341                         set_signals(info);
2342                 }
2343
2344 #if SYNCLINK_GENERIC_HDLC
2345                 if (info->netcount)
2346                         hdlcdev_tx_done(info);
2347                 else
2348 #endif
2349                 {
2350                         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2351                                 tx_stop(info);
2352                                 return;
2353                         }
2354                         info->pending_bh |= BH_TRANSMIT;
2355                 }
2356         }
2357 }
2358
2359
2360 /*
2361  * handle tx status interrupts
2362  */
2363 void isr_txint(SLMP_INFO * info)
2364 {
2365         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2366
2367         /* clear status bits */
2368         write_reg(info, SR1, status);
2369
2370         if ( debug_level >= DEBUG_LEVEL_ISR )
2371                 printk("%s(%d):%s isr_txint status=%02x\n",
2372                         __FILE__,__LINE__,info->device_name,status);
2373
2374         if (status & (UDRN + IDLE))
2375                 isr_txeom(info, status);
2376
2377         if (status & CCTS) {
2378                 /* simulate a common modem status change interrupt
2379                  * for our handler
2380                  */
2381                 get_signals( info );
2382                 isr_io_pin(info,
2383                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2384
2385         }
2386 }
2387
2388 /*
2389  * handle async tx data interrupts
2390  */
2391 void isr_txrdy(SLMP_INFO * info)
2392 {
2393         if ( debug_level >= DEBUG_LEVEL_ISR )
2394                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2395                         __FILE__,__LINE__,info->device_name,info->tx_count);
2396
2397         if (info->params.mode != MGSL_MODE_ASYNC) {
2398                 /* disable TXRDY IRQ, enable IDLE IRQ */
2399                 info->ie0_value &= ~TXRDYE;
2400                 info->ie1_value |= IDLE;
2401                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2402                 return;
2403         }
2404
2405         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2406                 tx_stop(info);
2407                 return;
2408         }
2409
2410         if ( info->tx_count )
2411                 tx_load_fifo( info );
2412         else {
2413                 info->tx_active = 0;
2414                 info->ie0_value &= ~TXRDYE;
2415                 write_reg(info, IE0, info->ie0_value);
2416         }
2417
2418         if (info->tx_count < WAKEUP_CHARS)
2419                 info->pending_bh |= BH_TRANSMIT;
2420 }
2421
2422 void isr_rxdmaok(SLMP_INFO * info)
2423 {
2424         /* BIT7 = EOT (end of transfer)
2425          * BIT6 = EOM (end of message/frame)
2426          */
2427         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2428
2429         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2430         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2431
2432         if ( debug_level >= DEBUG_LEVEL_ISR )
2433                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2434                         __FILE__,__LINE__,info->device_name,status);
2435
2436         info->pending_bh |= BH_RECEIVE;
2437 }
2438
2439 void isr_rxdmaerror(SLMP_INFO * info)
2440 {
2441         /* BIT5 = BOF (buffer overflow)
2442          * BIT4 = COF (counter overflow)
2443          */
2444         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2445
2446         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2447         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2448
2449         if ( debug_level >= DEBUG_LEVEL_ISR )
2450                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2451                         __FILE__,__LINE__,info->device_name,status);
2452
2453         info->rx_overflow = TRUE;
2454         info->pending_bh |= BH_RECEIVE;
2455 }
2456
2457 void isr_txdmaok(SLMP_INFO * info)
2458 {
2459         unsigned char status_reg1 = read_reg(info, SR1);
2460
2461         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2462         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2463         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2464
2465         if ( debug_level >= DEBUG_LEVEL_ISR )
2466                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2467                         __FILE__,__LINE__,info->device_name,status_reg1);
2468
2469         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2470         write_reg16(info, TRC0, 0);
2471         info->ie0_value |= TXRDYE;
2472         write_reg(info, IE0, info->ie0_value);
2473 }
2474
2475 void isr_txdmaerror(SLMP_INFO * info)
2476 {
2477         /* BIT5 = BOF (buffer overflow)
2478          * BIT4 = COF (counter overflow)
2479          */
2480         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2481
2482         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2483         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2484
2485         if ( debug_level >= DEBUG_LEVEL_ISR )
2486                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2487                         __FILE__,__LINE__,info->device_name,status);
2488 }
2489
2490 /* handle input serial signal changes
2491  */
2492 void isr_io_pin( SLMP_INFO *info, u16 status )
2493 {
2494         struct  mgsl_icount *icount;
2495
2496         if ( debug_level >= DEBUG_LEVEL_ISR )
2497                 printk("%s(%d):isr_io_pin status=%04X\n",
2498                         __FILE__,__LINE__,status);
2499
2500         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2501                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2502                 icount = &info->icount;
2503                 /* update input line counters */
2504                 if (status & MISCSTATUS_RI_LATCHED) {
2505                         icount->rng++;
2506                         if ( status & SerialSignal_RI )
2507                                 info->input_signal_events.ri_up++;
2508                         else
2509                                 info->input_signal_events.ri_down++;
2510                 }
2511                 if (status & MISCSTATUS_DSR_LATCHED) {
2512                         icount->dsr++;
2513                         if ( status & SerialSignal_DSR )
2514                                 info->input_signal_events.dsr_up++;
2515                         else
2516                                 info->input_signal_events.dsr_down++;
2517                 }
2518                 if (status & MISCSTATUS_DCD_LATCHED) {
2519                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2520                                 info->ie1_value &= ~CDCD;
2521                                 write_reg(info, IE1, info->ie1_value);
2522                         }
2523                         icount->dcd++;
2524                         if (status & SerialSignal_DCD) {
2525                                 info->input_signal_events.dcd_up++;
2526                         } else
2527                                 info->input_signal_events.dcd_down++;
2528 #if SYNCLINK_GENERIC_HDLC
2529                         if (info->netcount) {
2530                                 if (status & SerialSignal_DCD)
2531                                         netif_carrier_on(info->netdev);
2532                                 else
2533                                         netif_carrier_off(info->netdev);
2534                         }
2535 #endif
2536                 }
2537                 if (status & MISCSTATUS_CTS_LATCHED)
2538                 {
2539                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2540                                 info->ie1_value &= ~CCTS;
2541                                 write_reg(info, IE1, info->ie1_value);
2542                         }
2543                         icount->cts++;
2544                         if ( status & SerialSignal_CTS )
2545                                 info->input_signal_events.cts_up++;
2546                         else
2547                                 info->input_signal_events.cts_down++;
2548                 }
2549                 wake_up_interruptible(&info->status_event_wait_q);
2550                 wake_up_interruptible(&info->event_wait_q);
2551
2552                 if ( (info->flags & ASYNC_CHECK_CD) &&
2553                      (status & MISCSTATUS_DCD_LATCHED) ) {
2554                         if ( debug_level >= DEBUG_LEVEL_ISR )
2555                                 printk("%s CD now %s...", info->device_name,
2556                                        (status & SerialSignal_DCD) ? "on" : "off");
2557                         if (status & SerialSignal_DCD)
2558                                 wake_up_interruptible(&info->open_wait);
2559                         else {
2560                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2561                                         printk("doing serial hangup...");
2562                                 if (info->tty)
2563                                         tty_hangup(info->tty);
2564                         }
2565                 }
2566
2567                 if ( (info->flags & ASYNC_CTS_FLOW) &&
2568                      (status & MISCSTATUS_CTS_LATCHED) ) {
2569                         if ( info->tty ) {
2570                                 if (info->tty->hw_stopped) {
2571                                         if (status & SerialSignal_CTS) {
2572                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2573                                                         printk("CTS tx start...");
2574                                                 info->tty->hw_stopped = 0;
2575                                                 tx_start(info);
2576                                                 info->pending_bh |= BH_TRANSMIT;
2577                                                 return;
2578                                         }
2579                                 } else {
2580                                         if (!(status & SerialSignal_CTS)) {
2581                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2582                                                         printk("CTS tx stop...");
2583                                                 info->tty->hw_stopped = 1;
2584                                                 tx_stop(info);
2585                                         }
2586                                 }
2587                         }
2588                 }
2589         }
2590
2591         info->pending_bh |= BH_STATUS;
2592 }
2593
2594 /* Interrupt service routine entry point.
2595  *
2596  * Arguments:
2597  *      irq             interrupt number that caused interrupt
2598  *      dev_id          device ID supplied during interrupt registration
2599  *      regs            interrupted processor context
2600  */
2601 static irqreturn_t synclinkmp_interrupt(int irq, void *dev_id)
2602 {
2603         SLMP_INFO * info;
2604         unsigned char status, status0, status1=0;
2605         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2606         unsigned char timerstatus0, timerstatus1=0;
2607         unsigned char shift;
2608         unsigned int i;
2609         unsigned short tmp;
2610
2611         if ( debug_level >= DEBUG_LEVEL_ISR )
2612                 printk("%s(%d): synclinkmp_interrupt(%d)entry.\n",
2613                         __FILE__,__LINE__,irq);
2614
2615         info = (SLMP_INFO *)dev_id;
2616         if (!info)
2617                 return IRQ_NONE;
2618
2619         spin_lock(&info->lock);
2620
2621         for(;;) {
2622
2623                 /* get status for SCA0 (ports 0-1) */
2624                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2625                 status0 = (unsigned char)tmp;
2626                 dmastatus0 = (unsigned char)(tmp>>8);
2627                 timerstatus0 = read_reg(info, ISR2);
2628
2629                 if ( debug_level >= DEBUG_LEVEL_ISR )
2630                         printk("%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2631                                 __FILE__,__LINE__,info->device_name,
2632                                 status0,dmastatus0,timerstatus0);
2633
2634                 if (info->port_count == 4) {
2635                         /* get status for SCA1 (ports 2-3) */
2636                         tmp = read_reg16(info->port_array[2], ISR0);
2637                         status1 = (unsigned char)tmp;
2638                         dmastatus1 = (unsigned char)(tmp>>8);
2639                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2640
2641                         if ( debug_level >= DEBUG_LEVEL_ISR )
2642                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2643                                         __FILE__,__LINE__,info->device_name,
2644                                         status1,dmastatus1,timerstatus1);
2645                 }
2646
2647                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2648                          !status1 && !dmastatus1 && !timerstatus1)
2649                         break;
2650
2651                 for(i=0; i < info->port_count ; i++) {
2652                         if (info->port_array[i] == NULL)
2653                                 continue;
2654                         if (i < 2) {
2655                                 status = status0;
2656                                 dmastatus = dmastatus0;
2657                         } else {
2658                                 status = status1;
2659                                 dmastatus = dmastatus1;
2660                         }
2661
2662                         shift = i & 1 ? 4 :0;
2663
2664                         if (status & BIT0 << shift)
2665                                 isr_rxrdy(info->port_array[i]);
2666                         if (status & BIT1 << shift)
2667                                 isr_txrdy(info->port_array[i]);
2668                         if (status & BIT2 << shift)
2669                                 isr_rxint(info->port_array[i]);
2670                         if (status & BIT3 << shift)
2671                                 isr_txint(info->port_array[i]);
2672
2673                         if (dmastatus & BIT0 << shift)
2674                                 isr_rxdmaerror(info->port_array[i]);
2675                         if (dmastatus & BIT1 << shift)
2676                                 isr_rxdmaok(info->port_array[i]);
2677                         if (dmastatus & BIT2 << shift)
2678                                 isr_txdmaerror(info->port_array[i]);
2679                         if (dmastatus & BIT3 << shift)
2680                                 isr_txdmaok(info->port_array[i]);
2681                 }
2682
2683                 if (timerstatus0 & (BIT5 | BIT4))
2684                         isr_timer(info->port_array[0]);
2685                 if (timerstatus0 & (BIT7 | BIT6))
2686                         isr_timer(info->port_array[1]);
2687                 if (timerstatus1 & (BIT5 | BIT4))
2688                         isr_timer(info->port_array[2]);
2689                 if (timerstatus1 & (BIT7 | BIT6))
2690                         isr_timer(info->port_array[3]);
2691         }
2692
2693         for(i=0; i < info->port_count ; i++) {
2694                 SLMP_INFO * port = info->port_array[i];
2695
2696                 /* Request bottom half processing if there's something
2697                  * for it to do and the bh is not already running.
2698                  *
2699                  * Note: startup adapter diags require interrupts.
2700                  * do not request bottom half processing if the
2701                  * device is not open in a normal mode.
2702                  */
2703                 if ( port && (port->count || port->netcount) &&
2704                      port->pending_bh && !port->bh_running &&
2705                      !port->bh_requested ) {
2706                         if ( debug_level >= DEBUG_LEVEL_ISR )
2707                                 printk("%s(%d):%s queueing bh task.\n",
2708                                         __FILE__,__LINE__,port->device_name);
2709                         schedule_work(&port->task);
2710                         port->bh_requested = 1;
2711                 }
2712         }
2713
2714         spin_unlock(&info->lock);
2715
2716         if ( debug_level >= DEBUG_LEVEL_ISR )
2717                 printk("%s(%d):synclinkmp_interrupt(%d)exit.\n",
2718                         __FILE__,__LINE__,irq);
2719         return IRQ_HANDLED;
2720 }
2721
2722 /* Initialize and start device.
2723  */
2724 static int startup(SLMP_INFO * info)
2725 {
2726         if ( debug_level >= DEBUG_LEVEL_INFO )
2727                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2728
2729         if (info->flags & ASYNC_INITIALIZED)
2730                 return 0;
2731
2732         if (!info->tx_buf) {
2733                 info->tx_buf = (unsigned char *)kmalloc(info->max_frame_size, GFP_KERNEL);
2734                 if (!info->tx_buf) {
2735                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2736                                 __FILE__,__LINE__,info->device_name);
2737                         return -ENOMEM;
2738                 }
2739         }
2740
2741         info->pending_bh = 0;
2742
2743         memset(&info->icount, 0, sizeof(info->icount));
2744
2745         /* program hardware for current parameters */
2746         reset_port(info);
2747
2748         change_params(info);
2749
2750         info->status_timer.expires = jiffies + msecs_to_jiffies(10);
2751         add_timer(&info->status_timer);
2752
2753         if (info->tty)
2754                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2755
2756         info->flags |= ASYNC_INITIALIZED;
2757
2758         return 0;
2759 }
2760
2761 /* Called by close() and hangup() to shutdown hardware
2762  */
2763 static void shutdown(SLMP_INFO * info)
2764 {
2765         unsigned long flags;
2766
2767         if (!(info->flags & ASYNC_INITIALIZED))
2768                 return;
2769
2770         if (debug_level >= DEBUG_LEVEL_INFO)
2771                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2772                          __FILE__,__LINE__, info->device_name );
2773
2774         /* clear status wait queue because status changes */
2775         /* can't happen after shutting down the hardware */
2776         wake_up_interruptible(&info->status_event_wait_q);
2777         wake_up_interruptible(&info->event_wait_q);
2778
2779         del_timer(&info->tx_timer);
2780         del_timer(&info->status_timer);
2781
2782         kfree(info->tx_buf);
2783         info->tx_buf = NULL;
2784
2785         spin_lock_irqsave(&info->lock,flags);
2786
2787         reset_port(info);
2788
2789         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2790                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2791                 set_signals(info);
2792         }
2793
2794         spin_unlock_irqrestore(&info->lock,flags);
2795
2796         if (info->tty)
2797                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2798
2799         info->flags &= ~ASYNC_INITIALIZED;
2800 }
2801
2802 static void program_hw(SLMP_INFO *info)
2803 {
2804         unsigned long flags;
2805
2806         spin_lock_irqsave(&info->lock,flags);
2807
2808         rx_stop(info);
2809         tx_stop(info);
2810
2811         info->tx_count = info->tx_put = info->tx_get = 0;
2812
2813         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2814                 hdlc_mode(info);
2815         else
2816                 async_mode(info);
2817
2818         set_signals(info);
2819
2820         info->dcd_chkcount = 0;
2821         info->cts_chkcount = 0;
2822         info->ri_chkcount = 0;
2823         info->dsr_chkcount = 0;
2824
2825         info->ie1_value |= (CDCD|CCTS);
2826         write_reg(info, IE1, info->ie1_value);
2827
2828         get_signals(info);
2829
2830         if (info->netcount || (info->tty && info->tty->termios->c_cflag & CREAD) )
2831                 rx_start(info);
2832
2833         spin_unlock_irqrestore(&info->lock,flags);
2834 }
2835
2836 /* Reconfigure adapter based on new parameters
2837  */
2838 static void change_params(SLMP_INFO *info)
2839 {
2840         unsigned cflag;
2841         int bits_per_char;
2842
2843         if (!info->tty || !info->tty->termios)
2844                 return;
2845
2846         if (debug_level >= DEBUG_LEVEL_INFO)
2847                 printk("%s(%d):%s change_params()\n",
2848                          __FILE__,__LINE__, info->device_name );
2849
2850         cflag = info->tty->termios->c_cflag;
2851
2852         /* if B0 rate (hangup) specified then negate DTR and RTS */
2853         /* otherwise assert DTR and RTS */
2854         if (cflag & CBAUD)
2855                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2856         else
2857                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2858
2859         /* byte size and parity */
2860
2861         switch (cflag & CSIZE) {
2862               case CS5: info->params.data_bits = 5; break;
2863               case CS6: info->params.data_bits = 6; break;
2864               case CS7: info->params.data_bits = 7; break;
2865               case CS8: info->params.data_bits = 8; break;
2866               /* Never happens, but GCC is too dumb to figure it out */
2867               default:  info->params.data_bits = 7; break;
2868               }
2869
2870         if (cflag & CSTOPB)
2871                 info->params.stop_bits = 2;
2872         else
2873                 info->params.stop_bits = 1;
2874
2875         info->params.parity = ASYNC_PARITY_NONE;
2876         if (cflag & PARENB) {
2877                 if (cflag & PARODD)
2878                         info->params.parity = ASYNC_PARITY_ODD;
2879                 else
2880                         info->params.parity = ASYNC_PARITY_EVEN;
2881 #ifdef CMSPAR
2882                 if (cflag & CMSPAR)
2883                         info->params.parity = ASYNC_PARITY_SPACE;
2884 #endif
2885         }
2886
2887         /* calculate number of jiffies to transmit a full
2888          * FIFO (32 bytes) at specified data rate
2889          */
2890         bits_per_char = info->params.data_bits +
2891                         info->params.stop_bits + 1;
2892
2893         /* if port data rate is set to 460800 or less then
2894          * allow tty settings to override, otherwise keep the
2895          * current data rate.
2896          */
2897         if (info->params.data_rate <= 460800) {
2898                 info->params.data_rate = tty_get_baud_rate(info->tty);
2899         }
2900
2901         if ( info->params.data_rate ) {
2902                 info->timeout = (32*HZ*bits_per_char) /
2903                                 info->params.data_rate;
2904         }
2905         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2906
2907         if (cflag & CRTSCTS)
2908                 info->flags |= ASYNC_CTS_FLOW;
2909         else
2910                 info->flags &= ~ASYNC_CTS_FLOW;
2911
2912         if (cflag & CLOCAL)
2913                 info->flags &= ~ASYNC_CHECK_CD;
2914         else
2915                 info->flags |= ASYNC_CHECK_CD;
2916
2917         /* process tty input control flags */
2918
2919         info->read_status_mask2 = OVRN;
2920         if (I_INPCK(info->tty))
2921                 info->read_status_mask2 |= PE | FRME;
2922         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2923                 info->read_status_mask1 |= BRKD;
2924         if (I_IGNPAR(info->tty))
2925                 info->ignore_status_mask2 |= PE | FRME;
2926         if (I_IGNBRK(info->tty)) {
2927                 info->ignore_status_mask1 |= BRKD;
2928                 /* If ignoring parity and break indicators, ignore
2929                  * overruns too.  (For real raw support).
2930                  */
2931                 if (I_IGNPAR(info->tty))
2932                         info->ignore_status_mask2 |= OVRN;
2933         }
2934
2935         program_hw(info);
2936 }
2937
2938 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2939 {
2940         int err;
2941
2942         if (debug_level >= DEBUG_LEVEL_INFO)
2943                 printk("%s(%d):%s get_params()\n",
2944                          __FILE__,__LINE__, info->device_name);
2945
2946         if (!user_icount) {
2947                 memset(&info->icount, 0, sizeof(info->icount));
2948         } else {
2949                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2950                 if (err)
2951                         return -EFAULT;
2952         }
2953
2954         return 0;
2955 }
2956
2957 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2958 {
2959         int err;
2960         if (debug_level >= DEBUG_LEVEL_INFO)
2961                 printk("%s(%d):%s get_params()\n",
2962                          __FILE__,__LINE__, info->device_name);
2963
2964         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2965         if (err) {
2966                 if ( debug_level >= DEBUG_LEVEL_INFO )
2967                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2968                                 __FILE__,__LINE__,info->device_name);
2969                 return -EFAULT;
2970         }
2971
2972         return 0;
2973 }
2974
2975 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2976 {
2977         unsigned long flags;
2978         MGSL_PARAMS tmp_params;
2979         int err;
2980
2981         if (debug_level >= DEBUG_LEVEL_INFO)
2982                 printk("%s(%d):%s set_params\n",
2983                         __FILE__,__LINE__,info->device_name );
2984         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2985         if (err) {
2986                 if ( debug_level >= DEBUG_LEVEL_INFO )
2987                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2988                                 __FILE__,__LINE__,info->device_name);
2989                 return -EFAULT;
2990         }
2991
2992         spin_lock_irqsave(&info->lock,flags);
2993         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2994         spin_unlock_irqrestore(&info->lock,flags);
2995
2996         change_params(info);
2997
2998         return 0;
2999 }
3000
3001 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
3002 {
3003         int err;
3004
3005         if (debug_level >= DEBUG_LEVEL_INFO)
3006                 printk("%s(%d):%s get_txidle()=%d\n",
3007                          __FILE__,__LINE__, info->device_name, info->idle_mode);
3008
3009         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
3010         if (err) {
3011                 if ( debug_level >= DEBUG_LEVEL_INFO )
3012                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
3013                                 __FILE__,__LINE__,info->device_name);
3014                 return -EFAULT;
3015         }
3016
3017         return 0;
3018 }
3019
3020 static int set_txidle(SLMP_INFO * info, int idle_mode)
3021 {
3022         unsigned long flags;
3023
3024         if (debug_level >= DEBUG_LEVEL_INFO)
3025                 printk("%s(%d):%s set_txidle(%d)\n",
3026                         __FILE__,__LINE__,info->device_name, idle_mode );
3027
3028         spin_lock_irqsave(&info->lock,flags);
3029         info->idle_mode = idle_mode;
3030         tx_set_idle( info );
3031         spin_unlock_irqrestore(&info->lock,flags);
3032         return 0;
3033 }
3034
3035 static int tx_enable(SLMP_INFO * info, int enable)
3036 {
3037         unsigned long flags;
3038
3039         if (debug_level >= DEBUG_LEVEL_INFO)
3040                 printk("%s(%d):%s tx_enable(%d)\n",
3041                         __FILE__,__LINE__,info->device_name, enable);
3042
3043         spin_lock_irqsave(&info->lock,flags);
3044         if ( enable ) {
3045                 if ( !info->tx_enabled ) {
3046                         tx_start(info);
3047                 }
3048         } else {
3049                 if ( info->tx_enabled )
3050                         tx_stop(info);
3051         }
3052         spin_unlock_irqrestore(&info->lock,flags);
3053         return 0;
3054 }
3055
3056 /* abort send HDLC frame
3057  */
3058 static int tx_abort(SLMP_INFO * info)
3059 {
3060         unsigned long flags;
3061
3062         if (debug_level >= DEBUG_LEVEL_INFO)
3063                 printk("%s(%d):%s tx_abort()\n",
3064                         __FILE__,__LINE__,info->device_name);
3065
3066         spin_lock_irqsave(&info->lock,flags);
3067         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3068                 info->ie1_value &= ~UDRN;
3069                 info->ie1_value |= IDLE;
3070                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
3071                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
3072
3073                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
3074                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3075
3076                 write_reg(info, CMD, TXABORT);
3077         }
3078         spin_unlock_irqrestore(&info->lock,flags);
3079         return 0;
3080 }
3081
3082 static int rx_enable(SLMP_INFO * info, int enable)
3083 {
3084         unsigned long flags;
3085
3086         if (debug_level >= DEBUG_LEVEL_INFO)
3087                 printk("%s(%d):%s rx_enable(%d)\n",
3088                         __FILE__,__LINE__,info->device_name,enable);
3089
3090         spin_lock_irqsave(&info->lock,flags);
3091         if ( enable ) {
3092                 if ( !info->rx_enabled )
3093                         rx_start(info);
3094         } else {
3095                 if ( info->rx_enabled )
3096                         rx_stop(info);
3097         }
3098         spin_unlock_irqrestore(&info->lock,flags);
3099         return 0;
3100 }
3101
3102 /* wait for specified event to occur
3103  */
3104 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3105 {
3106         unsigned long flags;
3107         int s;
3108         int rc=0;
3109         struct mgsl_icount cprev, cnow;
3110         int events;
3111         int mask;
3112         struct  _input_signal_events oldsigs, newsigs;
3113         DECLARE_WAITQUEUE(wait, current);
3114
3115         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3116         if (rc) {
3117                 return  -EFAULT;
3118         }
3119
3120         if (debug_level >= DEBUG_LEVEL_INFO)
3121                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3122                         __FILE__,__LINE__,info->device_name,mask);
3123
3124         spin_lock_irqsave(&info->lock,flags);
3125
3126         /* return immediately if state matches requested events */
3127         get_signals(info);
3128         s = info->serial_signals;
3129
3130         events = mask &
3131                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3132                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3133                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3134                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3135         if (events) {
3136                 spin_unlock_irqrestore(&info->lock,flags);
3137                 goto exit;
3138         }
3139
3140         /* save current irq counts */
3141         cprev = info->icount;
3142         oldsigs = info->input_signal_events;
3143
3144         /* enable hunt and idle irqs if needed */
3145         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3146                 unsigned char oldval = info->ie1_value;
3147                 unsigned char newval = oldval +
3148                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3149                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3150                 if ( oldval != newval ) {
3151                         info->ie1_value = newval;
3152                         write_reg(info, IE1, info->ie1_value);
3153                 }
3154         }
3155
3156         set_current_state(TASK_INTERRUPTIBLE);
3157         add_wait_queue(&info->event_wait_q, &wait);
3158
3159         spin_unlock_irqrestore(&info->lock,flags);
3160
3161         for(;;) {
3162                 schedule();
3163                 if (signal_pending(current)) {
3164                         rc = -ERESTARTSYS;
3165                         break;
3166                 }
3167
3168                 /* get current irq counts */
3169                 spin_lock_irqsave(&info->lock,flags);
3170                 cnow = info->icount;
3171                 newsigs = info->input_signal_events;
3172                 set_current_state(TASK_INTERRUPTIBLE);
3173                 spin_unlock_irqrestore(&info->lock,flags);
3174
3175                 /* if no change, wait aborted for some reason */
3176                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3177                     newsigs.dsr_down == oldsigs.dsr_down &&
3178                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3179                     newsigs.dcd_down == oldsigs.dcd_down &&
3180                     newsigs.cts_up   == oldsigs.cts_up   &&
3181                     newsigs.cts_down == oldsigs.cts_down &&
3182                     newsigs.ri_up    == oldsigs.ri_up    &&
3183                     newsigs.ri_down  == oldsigs.ri_down  &&
3184                     cnow.exithunt    == cprev.exithunt   &&
3185                     cnow.rxidle      == cprev.rxidle) {
3186                         rc = -EIO;
3187                         break;
3188                 }
3189
3190                 events = mask &
3191                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3192                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3193                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3194                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3195                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3196                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3197                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3198                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3199                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3200                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3201                 if (events)
3202                         break;
3203
3204                 cprev = cnow;
3205                 oldsigs = newsigs;
3206         }
3207
3208         remove_wait_queue(&info->event_wait_q, &wait);
3209         set_current_state(TASK_RUNNING);
3210
3211
3212         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3213                 spin_lock_irqsave(&info->lock,flags);
3214                 if (!waitqueue_active(&info->event_wait_q)) {
3215                         /* disable enable exit hunt mode/idle rcvd IRQs */
3216                         info->ie1_value &= ~(FLGD|IDLD);
3217                         write_reg(info, IE1, info->ie1_value);
3218                 }
3219                 spin_unlock_irqrestore(&info->lock,flags);
3220         }
3221 exit:
3222         if ( rc == 0 )
3223                 PUT_USER(rc, events, mask_ptr);
3224
3225         return rc;
3226 }
3227
3228 static int modem_input_wait(SLMP_INFO *info,int arg)
3229 {
3230         unsigned long flags;
3231         int rc;
3232         struct mgsl_icount cprev, cnow;
3233         DECLARE_WAITQUEUE(wait, current);
3234
3235         /* save current irq counts */
3236         spin_lock_irqsave(&info->lock,flags);
3237         cprev = info->icount;
3238         add_wait_queue(&info->status_event_wait_q, &wait);
3239         set_current_state(TASK_INTERRUPTIBLE);
3240         spin_unlock_irqrestore(&info->lock,flags);
3241
3242         for(;;) {
3243                 schedule();
3244                 if (signal_pending(current)) {
3245                         rc = -ERESTARTSYS;
3246                         break;
3247                 }
3248
3249                 /* get new irq counts */
3250                 spin_lock_irqsave(&info->lock,flags);
3251                 cnow = info->icount;
3252                 set_current_state(TASK_INTERRUPTIBLE);
3253                 spin_unlock_irqrestore(&info->lock,flags);
3254
3255                 /* if no change, wait aborted for some reason */
3256                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3257                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3258                         rc = -EIO;
3259                         break;
3260                 }
3261
3262                 /* check for change in caller specified modem input */
3263                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3264                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3265                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3266                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3267                         rc = 0;
3268                         break;
3269                 }
3270
3271                 cprev = cnow;
3272         }
3273         remove_wait_queue(&info->status_event_wait_q, &wait);
3274         set_current_state(TASK_RUNNING);
3275         return rc;
3276 }
3277
3278 /* return the state of the serial control and status signals
3279  */
3280 static int tiocmget(struct tty_struct *tty, struct file *file)
3281 {
3282         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3283         unsigned int result;
3284         unsigned long flags;
3285
3286         spin_lock_irqsave(&info->lock,flags);
3287         get_signals(info);
3288         spin_unlock_irqrestore(&info->lock,flags);
3289
3290         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3291                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3292                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3293                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3294                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3295                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3296
3297         if (debug_level >= DEBUG_LEVEL_INFO)
3298                 printk("%s(%d):%s tiocmget() value=%08X\n",
3299                          __FILE__,__LINE__, info->device_name, result );
3300         return result;
3301 }
3302
3303 /* set modem control signals (DTR/RTS)
3304  */
3305 static int tiocmset(struct tty_struct *tty, struct file *file,
3306                     unsigned int set, unsigned int clear)
3307 {
3308         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3309         unsigned long flags;
3310
3311         if (debug_level >= DEBUG_LEVEL_INFO)
3312                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3313                         __FILE__,__LINE__,info->device_name, set, clear);
3314
3315         if (set & TIOCM_RTS)
3316                 info->serial_signals |= SerialSignal_RTS;
3317         if (set & TIOCM_DTR)
3318                 info->serial_signals |= SerialSignal_DTR;
3319         if (clear & TIOCM_RTS)
3320                 info->serial_signals &= ~SerialSignal_RTS;
3321         if (clear & TIOCM_DTR)
3322                 info->serial_signals &= ~SerialSignal_DTR;
3323
3324         spin_lock_irqsave(&info->lock,flags);
3325         set_signals(info);
3326         spin_unlock_irqrestore(&info->lock,flags);
3327
3328         return 0;
3329 }
3330
3331
3332
3333 /* Block the current process until the specified port is ready to open.
3334  */
3335 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3336                            SLMP_INFO *info)
3337 {
3338         DECLARE_WAITQUEUE(wait, current);
3339         int             retval;
3340         int             do_clocal = 0, extra_count = 0;
3341         unsigned long   flags;
3342
3343         if (debug_level >= DEBUG_LEVEL_INFO)
3344                 printk("%s(%d):%s block_til_ready()\n",
3345                          __FILE__,__LINE__, tty->driver->name );
3346
3347         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3348                 /* nonblock mode is set or port is not enabled */
3349                 /* just verify that callout device is not active */
3350                 info->flags |= ASYNC_NORMAL_ACTIVE;
3351                 return 0;
3352         }
3353
3354         if (tty->termios->c_cflag & CLOCAL)
3355                 do_clocal = 1;
3356
3357         /* Wait for carrier detect and the line to become
3358          * free (i.e., not in use by the callout).  While we are in
3359          * this loop, info->count is dropped by one, so that
3360          * close() knows when to free things.  We restore it upon
3361          * exit, either normal or abnormal.
3362          */
3363
3364         retval = 0;
3365         add_wait_queue(&info->open_wait, &wait);
3366
3367         if (debug_level >= DEBUG_LEVEL_INFO)
3368                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3369                          __FILE__,__LINE__, tty->driver->name, info->count );
3370
3371         spin_lock_irqsave(&info->lock, flags);
3372         if (!tty_hung_up_p(filp)) {
3373                 extra_count = 1;
3374                 info->count--;
3375         }
3376         spin_unlock_irqrestore(&info->lock, flags);
3377         info->blocked_open++;
3378
3379         while (1) {
3380                 if ((tty->termios->c_cflag & CBAUD)) {
3381                         spin_lock_irqsave(&info->lock,flags);
3382                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3383                         set_signals(info);
3384                         spin_unlock_irqrestore(&info->lock,flags);
3385                 }
3386
3387                 set_current_state(TASK_INTERRUPTIBLE);
3388
3389                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3390                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3391                                         -EAGAIN : -ERESTARTSYS;
3392                         break;
3393                 }
3394
3395                 spin_lock_irqsave(&info->lock,flags);
3396                 get_signals(info);
3397                 spin_unlock_irqrestore(&info->lock,flags);
3398
3399                 if (!(info->flags & ASYNC_CLOSING) &&
3400                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3401                         break;
3402                 }
3403
3404                 if (signal_pending(current)) {
3405                         retval = -ERESTARTSYS;
3406                         break;
3407                 }
3408
3409                 if (debug_level >= DEBUG_LEVEL_INFO)
3410                         printk("%s(%d):%s block_til_ready() count=%d\n",
3411                                  __FILE__,__LINE__, tty->driver->name, info->count );
3412
3413                 schedule();
3414         }
3415
3416         set_current_state(TASK_RUNNING);
3417         remove_wait_queue(&info->open_wait, &wait);
3418
3419         if (extra_count)
3420                 info->count++;
3421         info->blocked_open--;
3422
3423         if (debug_level >= DEBUG_LEVEL_INFO)
3424                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3425                          __FILE__,__LINE__, tty->driver->name, info->count );
3426
3427         if (!retval)
3428                 info->flags |= ASYNC_NORMAL_ACTIVE;
3429
3430         return retval;
3431 }
3432
3433 int alloc_dma_bufs(SLMP_INFO *info)
3434 {
3435         unsigned short BuffersPerFrame;
3436         unsigned short BufferCount;
3437
3438         // Force allocation to start at 64K boundary for each port.
3439         // This is necessary because *all* buffer descriptors for a port
3440         // *must* be in the same 64K block. All descriptors on a port
3441         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3442         // into the CBP register.
3443         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3444
3445         /* Calculate the number of DMA buffers necessary to hold the */
3446         /* largest allowable frame size. Note: If the max frame size is */
3447         /* not an even multiple of the DMA buffer size then we need to */
3448         /* round the buffer count per frame up one. */
3449
3450         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3451         if ( info->max_frame_size % SCABUFSIZE )
3452                 BuffersPerFrame++;
3453
3454         /* calculate total number of data buffers (SCABUFSIZE) possible
3455          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3456          * for the descriptor list (BUFFERLISTSIZE).
3457          */
3458         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3459
3460         /* limit number of buffers to maximum amount of descriptors */
3461         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3462                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3463
3464         /* use enough buffers to transmit one max size frame */
3465         info->tx_buf_count = BuffersPerFrame + 1;
3466
3467         /* never use more than half the available buffers for transmit */
3468         if (info->tx_buf_count > (BufferCount/2))
3469                 info->tx_buf_count = BufferCount/2;
3470
3471         if (info->tx_buf_count > SCAMAXDESC)
3472                 info->tx_buf_count = SCAMAXDESC;
3473
3474         /* use remaining buffers for receive */
3475         info->rx_buf_count = BufferCount - info->tx_buf_count;
3476
3477         if (info->rx_buf_count > SCAMAXDESC)
3478                 info->rx_buf_count = SCAMAXDESC;
3479
3480         if ( debug_level >= DEBUG_LEVEL_INFO )
3481                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3482                         __FILE__,__LINE__, info->device_name,
3483                         info->tx_buf_count,info->rx_buf_count);
3484
3485         if ( alloc_buf_list( info ) < 0 ||
3486                 alloc_frame_bufs(info,
3487                                         info->rx_buf_list,
3488                                         info->rx_buf_list_ex,
3489                                         info->rx_buf_count) < 0 ||
3490                 alloc_frame_bufs(info,
3491                                         info->tx_buf_list,
3492                                         info->tx_buf_list_ex,
3493                                         info->tx_buf_count) < 0 ||
3494                 alloc_tmp_rx_buf(info) < 0 ) {
3495                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3496                         __FILE__,__LINE__, info->device_name);
3497                 return -ENOMEM;
3498         }
3499
3500         rx_reset_buffers( info );
3501
3502         return 0;
3503 }
3504
3505 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3506  */
3507 int alloc_buf_list(SLMP_INFO *info)
3508 {
3509         unsigned int i;
3510
3511         /* build list in adapter shared memory */
3512         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3513         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3514         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3515
3516         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3517
3518         /* Save virtual address pointers to the receive and */
3519         /* transmit buffer lists. (Receive 1st). These pointers will */
3520         /* be used by the processor to access the lists. */
3521         info->rx_buf_list = (SCADESC *)info->buffer_list;
3522
3523         info->tx_buf_list = (SCADESC *)info->buffer_list;
3524         info->tx_buf_list += info->rx_buf_count;
3525
3526         /* Build links for circular buffer entry lists (tx and rx)
3527          *
3528          * Note: links are physical addresses read by the SCA device
3529          * to determine the next buffer entry to use.
3530          */
3531
3532         for ( i = 0; i < info->rx_buf_count; i++ ) {
3533                 /* calculate and store physical address of this buffer entry */
3534                 info->rx_buf_list_ex[i].phys_entry =
3535                         info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3536
3537                 /* calculate and store physical address of */
3538                 /* next entry in cirular list of entries */
3539                 info->rx_buf_list[i].next = info->buffer_list_phys;
3540                 if ( i < info->rx_buf_count - 1 )
3541                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3542
3543                 info->rx_buf_list[i].length = SCABUFSIZE;
3544         }
3545
3546         for ( i = 0; i < info->tx_buf_count; i++ ) {
3547                 /* calculate and store physical address of this buffer entry */
3548                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3549                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3550
3551                 /* calculate and store physical address of */
3552                 /* next entry in cirular list of entries */
3553
3554                 info->tx_buf_list[i].next = info->buffer_list_phys +
3555                         info->rx_buf_count * sizeof(SCADESC);
3556
3557                 if ( i < info->tx_buf_count - 1 )
3558                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3559         }
3560
3561         return 0;
3562 }
3563
3564 /* Allocate the frame DMA buffers used by the specified buffer list.
3565  */
3566 int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3567 {
3568         int i;
3569         unsigned long phys_addr;
3570
3571         for ( i = 0; i < count; i++ ) {
3572                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3573                 phys_addr = info->port_array[0]->last_mem_alloc;
3574                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3575
3576                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3577                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3578         }
3579
3580         return 0;
3581 }
3582
3583 void free_dma_bufs(SLMP_INFO *info)
3584 {
3585         info->buffer_list = NULL;
3586         info->rx_buf_list = NULL;
3587         info->tx_buf_list = NULL;
3588 }
3589
3590 /* allocate buffer large enough to hold max_frame_size.
3591  * This buffer is used to pass an assembled frame to the line discipline.
3592  */
3593 int alloc_tmp_rx_buf(SLMP_INFO *info)
3594 {
3595         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3596         if (info->tmp_rx_buf == NULL)
3597                 return -ENOMEM;
3598         return 0;
3599 }
3600
3601 void free_tmp_rx_buf(SLMP_INFO *info)
3602 {
3603         kfree(info->tmp_rx_buf);
3604         info->tmp_rx_buf = NULL;
3605 }
3606
3607 int claim_resources(SLMP_INFO *info)
3608 {
3609         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3610                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3611                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3612                 info->init_error = DiagStatus_AddressConflict;
3613                 goto errout;
3614         }
3615         else
3616                 info->shared_mem_requested = 1;
3617
3618         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3619                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3620                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3621                 info->init_error = DiagStatus_AddressConflict;
3622                 goto errout;
3623         }
3624         else
3625                 info->lcr_mem_requested = 1;
3626
3627         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3628                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3629                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3630                 info->init_error = DiagStatus_AddressConflict;
3631                 goto errout;
3632         }
3633         else
3634                 info->sca_base_requested = 1;
3635
3636         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3637                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3638                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3639                 info->init_error = DiagStatus_AddressConflict;
3640                 goto errout;
3641         }
3642         else
3643                 info->sca_statctrl_requested = 1;
3644
3645         info->memory_base = ioremap(info->phys_memory_base,SCA_MEM_SIZE);
3646         if (!info->memory_base) {
3647                 printk( "%s(%d):%s Cant map shared memory, MemAddr=%08X\n",
3648                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3649                 info->init_error = DiagStatus_CantAssignPciResources;
3650                 goto errout;
3651         }
3652
3653         info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE);
3654         if (!info->lcr_base) {
3655                 printk( "%s(%d):%s Cant map LCR memory, MemAddr=%08X\n",
3656                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3657                 info->init_error = DiagStatus_CantAssignPciResources;
3658                 goto errout;
3659         }
3660         info->lcr_base += info->lcr_offset;
3661
3662         info->sca_base = ioremap(info->phys_sca_base,PAGE_SIZE);
3663         if (!info->sca_base) {
3664                 printk( "%s(%d):%s Cant map SCA memory, MemAddr=%08X\n",
3665                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3666                 info->init_error = DiagStatus_CantAssignPciResources;
3667                 goto errout;
3668         }
3669         info->sca_base += info->sca_offset;
3670
3671         info->statctrl_base = ioremap(info->phys_statctrl_base,PAGE_SIZE);
3672         if (!info->statctrl_base) {
3673                 printk( "%s(%d):%s Cant map SCA Status/Control memory, MemAddr=%08X\n",
3674                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3675                 info->init_error = DiagStatus_CantAssignPciResources;
3676                 goto errout;
3677         }
3678         info->statctrl_base += info->statctrl_offset;
3679
3680         if ( !memory_test(info) ) {
3681                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3682                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3683                 info->init_error = DiagStatus_MemoryError;
3684                 goto errout;
3685         }
3686
3687         return 0;
3688
3689 errout:
3690         release_resources( info );
3691         return -ENODEV;
3692 }
3693
3694 void release_resources(SLMP_INFO *info)
3695 {
3696         if ( debug_level >= DEBUG_LEVEL_INFO )
3697                 printk( "%s(%d):%s release_resources() entry\n",
3698                         __FILE__,__LINE__,info->device_name );
3699
3700         if ( info->irq_requested ) {
3701                 free_irq(info->irq_level, info);
3702                 info->irq_requested = 0;
3703         }
3704
3705         if ( info->shared_mem_requested ) {
3706                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3707                 info->shared_mem_requested = 0;
3708         }
3709         if ( info->lcr_mem_requested ) {
3710                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3711                 info->lcr_mem_requested = 0;
3712         }
3713         if ( info->sca_base_requested ) {
3714                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3715                 info->sca_base_requested = 0;
3716         }
3717         if ( info->sca_statctrl_requested ) {
3718                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3719                 info->sca_statctrl_requested = 0;
3720         }
3721
3722         if (info->memory_base){
3723                 iounmap(info->memory_base);
3724                 info->memory_base = NULL;
3725         }
3726
3727         if (info->sca_base) {
3728                 iounmap(info->sca_base - info->sca_offset);
3729                 info->sca_base=NULL;
3730         }
3731
3732         if (info->statctrl_base) {
3733                 iounmap(info->statctrl_base - info->statctrl_offset);
3734                 info->statctrl_base=NULL;
3735         }
3736
3737         if (info->lcr_base){
3738                 iounmap(info->lcr_base - info->lcr_offset);
3739                 info->lcr_base = NULL;
3740         }
3741
3742         if ( debug_level >= DEBUG_LEVEL_INFO )
3743                 printk( "%s(%d):%s release_resources() exit\n",
3744                         __FILE__,__LINE__,info->device_name );
3745 }
3746
3747 /* Add the specified device instance data structure to the
3748  * global linked list of devices and increment the device count.
3749  */
3750 void add_device(SLMP_INFO *info)
3751 {
3752         info->next_device = NULL;
3753         info->line = synclinkmp_device_count;
3754         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3755
3756         if (info->line < MAX_DEVICES) {
3757                 if (maxframe[info->line])
3758                         info->max_frame_size = maxframe[info->line];
3759                 info->dosyncppp = dosyncppp[info->line];
3760         }
3761
3762         synclinkmp_device_count++;
3763
3764         if ( !synclinkmp_device_list )
3765                 synclinkmp_device_list = info;
3766         else {
3767                 SLMP_INFO *current_dev = synclinkmp_device_list;
3768                 while( current_dev->next_device )
3769                         current_dev = current_dev->next_device;
3770                 current_dev->next_device = info;
3771         }
3772
3773         if ( info->max_frame_size < 4096 )
3774                 info->max_frame_size = 4096;
3775         else if ( info->max_frame_size > 65535 )
3776                 info->max_frame_size = 65535;
3777
3778         printk( "SyncLink MultiPort %s: "
3779                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3780                 info->device_name,
3781                 info->phys_sca_base,
3782                 info->phys_memory_base,
3783                 info->phys_statctrl_base,
3784                 info->phys_lcr_base,
3785                 info->irq_level,
3786                 info->max_frame_size );
3787
3788 #if SYNCLINK_GENERIC_HDLC
3789         hdlcdev_init(info);
3790 #endif
3791 }
3792
3793 /* Allocate and initialize a device instance structure
3794  *
3795  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3796  */
3797 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3798 {
3799         SLMP_INFO *info;
3800
3801         info = (SLMP_INFO *)kmalloc(sizeof(SLMP_INFO),
3802                  GFP_KERNEL);
3803
3804         if (!info) {
3805                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3806                         __FILE__,__LINE__, adapter_num, port_num);
3807         } else {
3808                 memset(info, 0, sizeof(SLMP_INFO));
3809                 info->magic = MGSL_MAGIC;
3810                 INIT_WORK(&info->task, bh_handler);
3811                 info->max_frame_size = 4096;
3812                 info->close_delay = 5*HZ/10;
3813                 info->closing_wait = 30*HZ;
3814                 init_waitqueue_head(&info->open_wait);
3815                 init_waitqueue_head(&info->close_wait);
3816                 init_waitqueue_head(&info->status_event_wait_q);
3817                 init_waitqueue_head(&info->event_wait_q);
3818                 spin_lock_init(&info->netlock);
3819                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3820                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3821                 info->adapter_num = adapter_num;
3822                 info->port_num = port_num;
3823
3824                 /* Copy configuration info to device instance data */
3825                 info->irq_level = pdev->irq;
3826                 info->phys_lcr_base = pci_resource_start(pdev,0);
3827                 info->phys_sca_base = pci_resource_start(pdev,2);
3828                 info->phys_memory_base = pci_resource_start(pdev,3);
3829                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3830
3831                 /* Because veremap only works on page boundaries we must map
3832                  * a larger area than is actually implemented for the LCR
3833                  * memory range. We map a full page starting at the page boundary.
3834                  */
3835                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3836                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3837
3838                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3839                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3840
3841                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3842                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3843
3844                 info->bus_type = MGSL_BUS_TYPE_PCI;
3845                 info->irq_flags = IRQF_SHARED;
3846
3847                 init_timer(&info->tx_timer);
3848                 info->tx_timer.data = (unsigned long)info;
3849                 info->tx_timer.function = tx_timeout;
3850
3851                 init_timer(&info->status_timer);
3852                 info->status_timer.data = (unsigned long)info;
3853                 info->status_timer.function = status_timeout;
3854
3855                 /* Store the PCI9050 misc control register value because a flaw
3856                  * in the PCI9050 prevents LCR registers from being read if
3857                  * BIOS assigns an LCR base address with bit 7 set.
3858                  *
3859                  * Only the misc control register is accessed for which only
3860                  * write access is needed, so set an initial value and change
3861                  * bits to the device instance data as we write the value
3862                  * to the actual misc control register.
3863                  */
3864                 info->misc_ctrl_value = 0x087e4546;
3865
3866                 /* initial port state is unknown - if startup errors
3867                  * occur, init_error will be set to indicate the
3868                  * problem. Once the port is fully initialized,
3869                  * this value will be set to 0 to indicate the
3870                  * port is available.
3871                  */
3872                 info->init_error = -1;
3873         }
3874
3875         return info;
3876 }
3877
3878 void device_init(int adapter_num, struct pci_dev *pdev)
3879 {
3880         SLMP_INFO *port_array[SCA_MAX_PORTS];
3881         int port;
3882
3883         /* allocate device instances for up to SCA_MAX_PORTS devices */
3884         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3885                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3886                 if( port_array[port] == NULL ) {
3887                         for ( --port; port >= 0; --port )
3888                                 kfree(port_array[port]);
3889                         return;
3890                 }
3891         }
3892
3893         /* give copy of port_array to all ports and add to device list  */
3894         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3895                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3896                 add_device( port_array[port] );
3897                 spin_lock_init(&port_array[port]->lock);
3898         }
3899
3900         /* Allocate and claim adapter resources */
3901         if ( !claim_resources(port_array[0]) ) {
3902
3903                 alloc_dma_bufs(port_array[0]);
3904
3905                 /* copy resource information from first port to others */
3906                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3907                         port_array[port]->lock  = port_array[0]->lock;
3908                         port_array[port]->irq_level     = port_array[0]->irq_level;
3909                         port_array[port]->memory_base   = port_array[0]->memory_base;
3910                         port_array[port]->sca_base      = port_array[0]->sca_base;
3911                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3912                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3913                         alloc_dma_bufs(port_array[port]);
3914                 }
3915
3916                 if ( request_irq(port_array[0]->irq_level,
3917                                         synclinkmp_interrupt,
3918                                         port_array[0]->irq_flags,
3919                                         port_array[0]->device_name,
3920                                         port_array[0]) < 0 ) {
3921                         printk( "%s(%d):%s Cant request interrupt, IRQ=%d\n",
3922                                 __FILE__,__LINE__,
3923                                 port_array[0]->device_name,
3924                                 port_array[0]->irq_level );
3925                 }
3926                 else {
3927                         port_array[0]->irq_requested = 1;
3928                         adapter_test(port_array[0]);
3929                 }
3930         }
3931 }
3932
3933 static const struct tty_operations ops = {
3934         .open = open,
3935         .close = close,
3936         .write = write,
3937         .put_char = put_char,
3938         .flush_chars = flush_chars,
3939         .write_room = write_room,
3940         .chars_in_buffer = chars_in_buffer,
3941         .flush_buffer = flush_buffer,
3942         .ioctl = ioctl,
3943         .throttle = throttle,
3944         .unthrottle = unthrottle,
3945         .send_xchar = send_xchar,
3946         .break_ctl = set_break,
3947         .wait_until_sent = wait_until_sent,
3948         .read_proc = read_proc,
3949         .set_termios = set_termios,
3950         .stop = tx_hold,
3951         .start = tx_release,
3952         .hangup = hangup,
3953         .tiocmget = tiocmget,
3954         .tiocmset = tiocmset,
3955 };
3956
3957 static void synclinkmp_cleanup(void)
3958 {
3959         int rc;
3960         SLMP_INFO *info;
3961         SLMP_INFO *tmp;
3962
3963         printk("Unloading %s %s\n", driver_name, driver_version);
3964
3965         if (serial_driver) {
3966                 if ((rc = tty_unregister_driver(serial_driver)))
3967                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3968                                __FILE__,__LINE__,rc);
3969                 put_tty_driver(serial_driver);
3970         }
3971
3972         /* reset devices */
3973         info = synclinkmp_device_list;
3974         while(info) {
3975                 reset_port(info);
3976                 info = info->next_device;
3977         }
3978
3979         /* release devices */
3980         info = synclinkmp_device_list;
3981         while(info) {
3982 #if SYNCLINK_GENERIC_HDLC
3983                 hdlcdev_exit(info);
3984 #endif
3985                 free_dma_bufs(info);
3986                 free_tmp_rx_buf(info);
3987                 if ( info->port_num == 0 ) {
3988                         if (info->sca_base)
3989                                 write_reg(info, LPR, 1); /* set low power mode */
3990                         release_resources(info);
3991                 }
3992                 tmp = info;
3993                 info = info->next_device;
3994                 kfree(tmp);
3995         }
3996
3997         pci_unregister_driver(&synclinkmp_pci_driver);
3998 }
3999
4000 /* Driver initialization entry point.
4001  */
4002
4003 static int __init synclinkmp_init(void)
4004 {
4005         int rc;
4006
4007         if (break_on_load) {
4008                 synclinkmp_get_text_ptr();
4009                 BREAKPOINT();
4010         }
4011
4012         printk("%s %s\n", driver_name, driver_version);
4013
4014         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
4015                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4016                 return rc;
4017         }
4018
4019         serial_driver = alloc_tty_driver(128);
4020         if (!serial_driver) {
4021                 rc = -ENOMEM;
4022                 goto error;
4023         }
4024
4025         /* Initialize the tty_driver structure */
4026
4027         serial_driver->owner = THIS_MODULE;
4028         serial_driver->driver_name = "synclinkmp";
4029         serial_driver->name = "ttySLM";
4030         serial_driver->major = ttymajor;
4031         serial_driver->minor_start = 64;
4032         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4033         serial_driver->subtype = SERIAL_TYPE_NORMAL;
4034         serial_driver->init_termios = tty_std_termios;
4035         serial_driver->init_termios.c_cflag =
4036                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4037         serial_driver->init_termios.c_ispeed = 9600;
4038         serial_driver->init_termios.c_ospeed = 9600;
4039         serial_driver->flags = TTY_DRIVER_REAL_RAW;
4040         tty_set_operations(serial_driver, &ops);
4041         if ((rc = tty_register_driver(serial_driver)) < 0) {
4042                 printk("%s(%d):Couldn't register serial driver\n",
4043                         __FILE__,__LINE__);
4044                 put_tty_driver(serial_driver);
4045                 serial_driver = NULL;
4046                 goto error;
4047         }
4048
4049         printk("%s %s, tty major#%d\n",
4050                 driver_name, driver_version,
4051                 serial_driver->major);
4052
4053         return 0;
4054
4055 error:
4056         synclinkmp_cleanup();
4057         return rc;
4058 }
4059
4060 static void __exit synclinkmp_exit(void)
4061 {
4062         synclinkmp_cleanup();
4063 }
4064
4065 module_init(synclinkmp_init);
4066 module_exit(synclinkmp_exit);
4067
4068 /* Set the port for internal loopback mode.
4069  * The TxCLK and RxCLK signals are generated from the BRG and
4070  * the TxD is looped back to the RxD internally.
4071  */
4072 void enable_loopback(SLMP_INFO *info, int enable)
4073 {
4074         if (enable) {
4075                 /* MD2 (Mode Register 2)
4076                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4077                  */
4078                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4079
4080                 /* degate external TxC clock source */
4081                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4082                 write_control_reg(info);
4083
4084                 /* RXS/TXS (Rx/Tx clock source)
4085                  * 07      Reserved, must be 0
4086                  * 06..04  Clock Source, 100=BRG
4087                  * 03..00  Clock Divisor, 0000=1
4088                  */
4089                 write_reg(info, RXS, 0x40);
4090                 write_reg(info, TXS, 0x40);
4091
4092         } else {
4093                 /* MD2 (Mode Register 2)
4094                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4095                  */
4096                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4097
4098                 /* RXS/TXS (Rx/Tx clock source)
4099                  * 07      Reserved, must be 0
4100                  * 06..04  Clock Source, 000=RxC/TxC Pin
4101                  * 03..00  Clock Divisor, 0000=1
4102                  */
4103                 write_reg(info, RXS, 0x00);
4104                 write_reg(info, TXS, 0x00);
4105         }
4106
4107         /* set LinkSpeed if available, otherwise default to 2Mbps */
4108         if (info->params.clock_speed)
4109                 set_rate(info, info->params.clock_speed);
4110         else
4111                 set_rate(info, 3686400);
4112 }
4113
4114 /* Set the baud rate register to the desired speed
4115  *
4116  *      data_rate       data rate of clock in bits per second
4117  *                      A data rate of 0 disables the AUX clock.
4118  */
4119 void set_rate( SLMP_INFO *info, u32 data_rate )
4120 {
4121         u32 TMCValue;
4122         unsigned char BRValue;
4123         u32 Divisor=0;
4124
4125         /* fBRG = fCLK/(TMC * 2^BR)
4126          */
4127         if (data_rate != 0) {
4128                 Divisor = 14745600/data_rate;
4129                 if (!Divisor)
4130                         Divisor = 1;
4131
4132                 TMCValue = Divisor;
4133
4134                 BRValue = 0;
4135                 if (TMCValue != 1 && TMCValue != 2) {
4136                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4137                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4138                          * 50/50 duty cycle.
4139                          */
4140                         BRValue = 1;
4141                         TMCValue >>= 1;
4142                 }
4143
4144                 /* while TMCValue is too big for TMC register, divide
4145                  * by 2 and increment BR exponent.
4146                  */
4147                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4148                         TMCValue >>= 1;
4149
4150                 write_reg(info, TXS,
4151                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4152                 write_reg(info, RXS,
4153                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4154                 write_reg(info, TMC, (unsigned char)TMCValue);
4155         }
4156         else {
4157                 write_reg(info, TXS,0);
4158                 write_reg(info, RXS,0);
4159                 write_reg(info, TMC, 0);
4160         }
4161 }
4162
4163 /* Disable receiver
4164  */
4165 void rx_stop(SLMP_INFO *info)
4166 {
4167         if (debug_level >= DEBUG_LEVEL_ISR)
4168                 printk("%s(%d):%s rx_stop()\n",
4169                          __FILE__,__LINE__, info->device_name );
4170
4171         write_reg(info, CMD, RXRESET);
4172
4173         info->ie0_value &= ~RXRDYE;
4174         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4175
4176         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4177         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4178         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4179
4180         info->rx_enabled = 0;
4181         info->rx_overflow = 0;
4182 }
4183
4184 /* enable the receiver
4185  */
4186 void rx_start(SLMP_INFO *info)
4187 {
4188         int i;
4189
4190         if (debug_level >= DEBUG_LEVEL_ISR)
4191                 printk("%s(%d):%s rx_start()\n",
4192                          __FILE__,__LINE__, info->device_name );
4193
4194         write_reg(info, CMD, RXRESET);
4195
4196         if ( info->params.mode == MGSL_MODE_HDLC ) {
4197                 /* HDLC, disabe IRQ on rxdata */
4198                 info->ie0_value &= ~RXRDYE;
4199                 write_reg(info, IE0, info->ie0_value);
4200
4201                 /* Reset all Rx DMA buffers and program rx dma */
4202                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4203                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4204
4205                 for (i = 0; i < info->rx_buf_count; i++) {
4206                         info->rx_buf_list[i].status = 0xff;
4207
4208                         // throttle to 4 shared memory writes at a time to prevent
4209                         // hogging local bus (keep latency time for DMA requests low).
4210                         if (!(i % 4))
4211                                 read_status_reg(info);
4212                 }
4213                 info->current_rx_buf = 0;
4214
4215                 /* set current/1st descriptor address */
4216                 write_reg16(info, RXDMA + CDA,
4217                         info->rx_buf_list_ex[0].phys_entry);
4218
4219                 /* set new last rx descriptor address */
4220                 write_reg16(info, RXDMA + EDA,
4221                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4222
4223                 /* set buffer length (shared by all rx dma data buffers) */
4224                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4225
4226                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4227                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4228         } else {
4229                 /* async, enable IRQ on rxdata */
4230                 info->ie0_value |= RXRDYE;
4231                 write_reg(info, IE0, info->ie0_value);
4232         }
4233
4234         write_reg(info, CMD, RXENABLE);
4235
4236         info->rx_overflow = FALSE;
4237         info->rx_enabled = 1;
4238 }
4239
4240 /* Enable the transmitter and send a transmit frame if
4241  * one is loaded in the DMA buffers.
4242  */
4243 void tx_start(SLMP_INFO *info)
4244 {
4245         if (debug_level >= DEBUG_LEVEL_ISR)
4246                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4247                          __FILE__,__LINE__, info->device_name,info->tx_count );
4248
4249         if (!info->tx_enabled ) {
4250                 write_reg(info, CMD, TXRESET);
4251                 write_reg(info, CMD, TXENABLE);
4252                 info->tx_enabled = TRUE;
4253         }
4254
4255         if ( info->tx_count ) {
4256
4257                 /* If auto RTS enabled and RTS is inactive, then assert */
4258                 /* RTS and set a flag indicating that the driver should */
4259                 /* negate RTS when the transmission completes. */
4260
4261                 info->drop_rts_on_tx_done = 0;
4262
4263                 if (info->params.mode != MGSL_MODE_ASYNC) {
4264
4265                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4266                                 get_signals( info );
4267                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4268                                         info->serial_signals |= SerialSignal_RTS;
4269                                         set_signals( info );
4270                                         info->drop_rts_on_tx_done = 1;
4271                                 }
4272                         }
4273
4274                         write_reg16(info, TRC0,
4275                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4276
4277                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4278                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4279
4280                         /* set TX CDA (current descriptor address) */
4281                         write_reg16(info, TXDMA + CDA,
4282                                 info->tx_buf_list_ex[0].phys_entry);
4283
4284                         /* set TX EDA (last descriptor address) */
4285                         write_reg16(info, TXDMA + EDA,
4286                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4287
4288                         /* enable underrun IRQ */
4289                         info->ie1_value &= ~IDLE;
4290                         info->ie1_value |= UDRN;
4291                         write_reg(info, IE1, info->ie1_value);
4292                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4293
4294                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4295                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4296
4297                         info->tx_timer.expires = jiffies + msecs_to_jiffies(5000);
4298                         add_timer(&info->tx_timer);
4299                 }
4300                 else {
4301                         tx_load_fifo(info);
4302                         /* async, enable IRQ on txdata */
4303                         info->ie0_value |= TXRDYE;
4304                         write_reg(info, IE0, info->ie0_value);
4305                 }
4306
4307                 info->tx_active = 1;
4308         }
4309 }
4310
4311 /* stop the transmitter and DMA
4312  */
4313 void tx_stop( SLMP_INFO *info )
4314 {
4315         if (debug_level >= DEBUG_LEVEL_ISR)
4316                 printk("%s(%d):%s tx_stop()\n",
4317                          __FILE__,__LINE__, info->device_name );
4318
4319         del_timer(&info->tx_timer);
4320
4321         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4322         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4323
4324         write_reg(info, CMD, TXRESET);
4325
4326         info->ie1_value &= ~(UDRN + IDLE);
4327         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4328         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4329
4330         info->ie0_value &= ~TXRDYE;
4331         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4332
4333         info->tx_enabled = 0;
4334         info->tx_active  = 0;
4335 }
4336
4337 /* Fill the transmit FIFO until the FIFO is full or
4338  * there is no more data to load.
4339  */
4340 void tx_load_fifo(SLMP_INFO *info)
4341 {
4342         u8 TwoBytes[2];
4343
4344         /* do nothing is now tx data available and no XON/XOFF pending */
4345
4346         if ( !info->tx_count && !info->x_char )
4347                 return;
4348
4349         /* load the Transmit FIFO until FIFOs full or all data sent */
4350
4351         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4352
4353                 /* there is more space in the transmit FIFO and */
4354                 /* there is more data in transmit buffer */
4355
4356                 if ( (info->tx_count > 1) && !info->x_char ) {
4357                         /* write 16-bits */
4358                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4359                         if (info->tx_get >= info->max_frame_size)
4360                                 info->tx_get -= info->max_frame_size;
4361                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4362                         if (info->tx_get >= info->max_frame_size)
4363                                 info->tx_get -= info->max_frame_size;
4364
4365                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4366
4367                         info->tx_count -= 2;
4368                         info->icount.tx += 2;
4369                 } else {
4370                         /* only 1 byte left to transmit or 1 FIFO slot left */
4371
4372                         if (info->x_char) {
4373                                 /* transmit pending high priority char */
4374                                 write_reg(info, TRB, info->x_char);
4375                                 info->x_char = 0;
4376                         } else {
4377                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4378                                 if (info->tx_get >= info->max_frame_size)
4379                                         info->tx_get -= info->max_frame_size;
4380                                 info->tx_count--;
4381                         }
4382                         info->icount.tx++;
4383                 }
4384         }
4385 }
4386
4387 /* Reset a port to a known state
4388  */
4389 void reset_port(SLMP_INFO *info)
4390 {
4391         if (info->sca_base) {
4392
4393                 tx_stop(info);
4394                 rx_stop(info);
4395
4396                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4397                 set_signals(info);
4398
4399                 /* disable all port interrupts */
4400                 info->ie0_value = 0;
4401                 info->ie1_value = 0;
4402                 info->ie2_value = 0;
4403                 write_reg(info, IE0, info->ie0_value);
4404                 write_reg(info, IE1, info->ie1_value);
4405                 write_reg(info, IE2, info->ie2_value);
4406
4407                 write_reg(info, CMD, CHRESET);
4408         }
4409 }
4410
4411 /* Reset all the ports to a known state.
4412  */
4413 void reset_adapter(SLMP_INFO *info)
4414 {
4415         int i;
4416
4417         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4418                 if (info->port_array[i])
4419                         reset_port(info->port_array[i]);
4420         }
4421 }
4422
4423 /* Program port for asynchronous communications.
4424  */
4425 void async_mode(SLMP_INFO *info)
4426 {
4427
4428         unsigned char RegValue;
4429
4430         tx_stop(info);
4431         rx_stop(info);
4432
4433         /* MD0, Mode Register 0
4434          *
4435          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4436          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4437          * 03      Reserved, must be 0
4438          * 02      CRCCC, CRC Calculation, 0=disabled
4439          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4440          *
4441          * 0000 0000
4442          */
4443         RegValue = 0x00;
4444         if (info->params.stop_bits != 1)
4445                 RegValue |= BIT1;
4446         write_reg(info, MD0, RegValue);
4447
4448         /* MD1, Mode Register 1
4449          *
4450          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4451          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4452          * 03..02  RXCHR<1..0>, rx char size
4453          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4454          *
4455          * 0100 0000
4456          */
4457         RegValue = 0x40;
4458         switch (info->params.data_bits) {
4459         case 7: RegValue |= BIT4 + BIT2; break;
4460         case 6: RegValue |= BIT5 + BIT3; break;
4461         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4462         }
4463         if (info->params.parity != ASYNC_PARITY_NONE) {
4464                 RegValue |= BIT1;
4465                 if (info->params.parity == ASYNC_PARITY_ODD)
4466                         RegValue |= BIT0;
4467         }
4468         write_reg(info, MD1, RegValue);
4469
4470         /* MD2, Mode Register 2
4471          *
4472          * 07..02  Reserved, must be 0
4473          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4474          *
4475          * 0000 0000
4476          */
4477         RegValue = 0x00;
4478         if (info->params.loopback)
4479                 RegValue |= (BIT1 + BIT0);
4480         write_reg(info, MD2, RegValue);
4481
4482         /* RXS, Receive clock source
4483          *
4484          * 07      Reserved, must be 0
4485          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4486          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4487          */
4488         RegValue=BIT6;
4489         write_reg(info, RXS, RegValue);
4490
4491         /* TXS, Transmit clock source
4492          *
4493          * 07      Reserved, must be 0
4494          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4495          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4496          */
4497         RegValue=BIT6;
4498         write_reg(info, TXS, RegValue);
4499
4500         /* Control Register
4501          *
4502          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4503          */
4504         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4505         write_control_reg(info);
4506
4507         tx_set_idle(info);
4508
4509         /* RRC Receive Ready Control 0
4510          *
4511          * 07..05  Reserved, must be 0
4512          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4513          */
4514         write_reg(info, RRC, 0x00);
4515
4516         /* TRC0 Transmit Ready Control 0
4517          *
4518          * 07..05  Reserved, must be 0
4519          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4520          */
4521         write_reg(info, TRC0, 0x10);
4522
4523         /* TRC1 Transmit Ready Control 1
4524          *
4525          * 07..05  Reserved, must be 0
4526          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4527          */
4528         write_reg(info, TRC1, 0x1e);
4529
4530         /* CTL, MSCI control register
4531          *
4532          * 07..06  Reserved, set to 0
4533          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4534          * 04      IDLC, idle control, 0=mark 1=idle register
4535          * 03      BRK, break, 0=off 1 =on (async)
4536          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4537          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4538          * 00      RTS, RTS output control, 0=active 1=inactive
4539          *
4540          * 0001 0001
4541          */
4542         RegValue = 0x10;
4543         if (!(info->serial_signals & SerialSignal_RTS))
4544                 RegValue |= 0x01;
4545         write_reg(info, CTL, RegValue);
4546
4547         /* enable status interrupts */
4548         info->ie0_value |= TXINTE + RXINTE;
4549         write_reg(info, IE0, info->ie0_value);
4550
4551         /* enable break detect interrupt */
4552         info->ie1_value = BRKD;
4553         write_reg(info, IE1, info->ie1_value);
4554
4555         /* enable rx overrun interrupt */
4556         info->ie2_value = OVRN;
4557         write_reg(info, IE2, info->ie2_value);
4558
4559         set_rate( info, info->params.data_rate * 16 );
4560 }
4561
4562 /* Program the SCA for HDLC communications.
4563  */
4564 void hdlc_mode(SLMP_INFO *info)
4565 {
4566         unsigned char RegValue;
4567         u32 DpllDivisor;
4568
4569         // Can't use DPLL because SCA outputs recovered clock on RxC when
4570         // DPLL mode selected. This causes output contention with RxC receiver.
4571         // Use of DPLL would require external hardware to disable RxC receiver
4572         // when DPLL mode selected.
4573         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4574
4575         /* disable DMA interrupts */
4576         write_reg(info, TXDMA + DIR, 0);
4577         write_reg(info, RXDMA + DIR, 0);
4578
4579         /* MD0, Mode Register 0
4580          *
4581          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4582          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4583          * 03      Reserved, must be 0
4584          * 02      CRCCC, CRC Calculation, 1=enabled
4585          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4586          * 00      CRC0, CRC initial value, 1 = all 1s
4587          *
4588          * 1000 0001
4589          */
4590         RegValue = 0x81;
4591         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4592                 RegValue |= BIT4;
4593         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4594                 RegValue |= BIT4;
4595         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4596                 RegValue |= BIT2 + BIT1;
4597         write_reg(info, MD0, RegValue);
4598
4599         /* MD1, Mode Register 1
4600          *
4601          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4602          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4603          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4604          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4605          *
4606          * 0000 0000
4607          */
4608         RegValue = 0x00;
4609         write_reg(info, MD1, RegValue);
4610
4611         /* MD2, Mode Register 2
4612          *
4613          * 07      NRZFM, 0=NRZ, 1=FM
4614          * 06..05  CODE<1..0> Encoding, 00=NRZ
4615          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4616          * 02      Reserved, must be 0
4617          * 01..00  CNCT<1..0> Channel connection, 0=normal
4618          *
4619          * 0000 0000
4620          */
4621         RegValue = 0x00;
4622         switch(info->params.encoding) {
4623         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4624         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4625         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4626         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4627 #if 0
4628         case HDLC_ENCODING_NRZB:                                        /* not supported */
4629         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4630         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4631 #endif
4632         }
4633         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4634                 DpllDivisor = 16;
4635                 RegValue |= BIT3;
4636         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4637                 DpllDivisor = 8;
4638         } else {
4639                 DpllDivisor = 32;
4640                 RegValue |= BIT4;
4641         }
4642         write_reg(info, MD2, RegValue);
4643
4644
4645         /* RXS, Receive clock source
4646          *
4647          * 07      Reserved, must be 0
4648          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4649          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4650          */
4651         RegValue=0;
4652         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4653                 RegValue |= BIT6;
4654         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4655                 RegValue |= BIT6 + BIT5;
4656         write_reg(info, RXS, RegValue);
4657
4658         /* TXS, Transmit clock source
4659          *
4660          * 07      Reserved, must be 0
4661          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4662          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4663          */
4664         RegValue=0;
4665         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4666                 RegValue |= BIT6;
4667         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4668                 RegValue |= BIT6 + BIT5;
4669         write_reg(info, TXS, RegValue);
4670
4671         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4672                 set_rate(info, info->params.clock_speed * DpllDivisor);
4673         else
4674                 set_rate(info, info->params.clock_speed);
4675
4676         /* GPDATA (General Purpose I/O Data Register)
4677          *
4678          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4679          */
4680         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4681                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4682         else
4683                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4684         write_control_reg(info);
4685
4686         /* RRC Receive Ready Control 0
4687          *
4688          * 07..05  Reserved, must be 0
4689          * 04..00  RRC<4..0> Rx FIFO trigger active
4690          */
4691         write_reg(info, RRC, rx_active_fifo_level);
4692
4693         /* TRC0 Transmit Ready Control 0
4694          *
4695          * 07..05  Reserved, must be 0
4696          * 04..00  TRC<4..0> Tx FIFO trigger active
4697          */
4698         write_reg(info, TRC0, tx_active_fifo_level);
4699
4700         /* TRC1 Transmit Ready Control 1
4701          *
4702          * 07..05  Reserved, must be 0
4703          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4704          */
4705         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4706
4707         /* DMR, DMA Mode Register
4708          *
4709          * 07..05  Reserved, must be 0
4710          * 04      TMOD, Transfer Mode: 1=chained-block
4711          * 03      Reserved, must be 0
4712          * 02      NF, Number of Frames: 1=multi-frame
4713          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4714          * 00      Reserved, must be 0
4715          *
4716          * 0001 0100
4717          */
4718         write_reg(info, TXDMA + DMR, 0x14);
4719         write_reg(info, RXDMA + DMR, 0x14);
4720
4721         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4722         write_reg(info, RXDMA + CPB,
4723                 (unsigned char)(info->buffer_list_phys >> 16));
4724
4725         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4726         write_reg(info, TXDMA + CPB,
4727                 (unsigned char)(info->buffer_list_phys >> 16));
4728
4729         /* enable status interrupts. other code enables/disables
4730          * the individual sources for these two interrupt classes.
4731          */
4732         info->ie0_value |= TXINTE + RXINTE;
4733         write_reg(info, IE0, info->ie0_value);
4734
4735         /* CTL, MSCI control register
4736          *
4737          * 07..06  Reserved, set to 0
4738          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4739          * 04      IDLC, idle control, 0=mark 1=idle register
4740          * 03      BRK, break, 0=off 1 =on (async)
4741          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4742          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4743          * 00      RTS, RTS output control, 0=active 1=inactive
4744          *
4745          * 0001 0001
4746          */
4747         RegValue = 0x10;
4748         if (!(info->serial_signals & SerialSignal_RTS))
4749                 RegValue |= 0x01;
4750         write_reg(info, CTL, RegValue);
4751
4752         /* preamble not supported ! */
4753
4754         tx_set_idle(info);
4755         tx_stop(info);
4756         rx_stop(info);
4757
4758         set_rate(info, info->params.clock_speed);
4759
4760         if (info->params.loopback)
4761                 enable_loopback(info,1);
4762 }
4763
4764 /* Set the transmit HDLC idle mode
4765  */
4766 void tx_set_idle(SLMP_INFO *info)
4767 {
4768         unsigned char RegValue = 0xff;
4769
4770         /* Map API idle mode to SCA register bits */
4771         switch(info->idle_mode) {
4772         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4773         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4774         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4775         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4776         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4777         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4778         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4779         }
4780
4781         write_reg(info, IDL, RegValue);
4782 }
4783
4784 /* Query the adapter for the state of the V24 status (input) signals.
4785  */
4786 void get_signals(SLMP_INFO *info)
4787 {
4788         u16 status = read_reg(info, SR3);
4789         u16 gpstatus = read_status_reg(info);
4790         u16 testbit;
4791
4792         /* clear all serial signals except DTR and RTS */
4793         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4794
4795         /* set serial signal bits to reflect MISR */
4796
4797         if (!(status & BIT3))
4798                 info->serial_signals |= SerialSignal_CTS;
4799
4800         if ( !(status & BIT2))
4801                 info->serial_signals |= SerialSignal_DCD;
4802
4803         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4804         if (!(gpstatus & testbit))
4805                 info->serial_signals |= SerialSignal_RI;
4806
4807         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4808         if (!(gpstatus & testbit))
4809                 info->serial_signals |= SerialSignal_DSR;
4810 }
4811
4812 /* Set the state of DTR and RTS based on contents of
4813  * serial_signals member of device context.
4814  */
4815 void set_signals(SLMP_INFO *info)
4816 {
4817         unsigned char RegValue;
4818         u16 EnableBit;
4819
4820         RegValue = read_reg(info, CTL);
4821         if (info->serial_signals & SerialSignal_RTS)
4822                 RegValue &= ~BIT0;
4823         else
4824                 RegValue |= BIT0;
4825         write_reg(info, CTL, RegValue);
4826
4827         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4828         EnableBit = BIT1 << (info->port_num*2);
4829         if (info->serial_signals & SerialSignal_DTR)
4830                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4831         else
4832                 info->port_array[0]->ctrlreg_value |= EnableBit;
4833         write_control_reg(info);
4834 }
4835
4836 /*******************/
4837 /* DMA Buffer Code */
4838 /*******************/
4839
4840 /* Set the count for all receive buffers to SCABUFSIZE
4841  * and set the current buffer to the first buffer. This effectively
4842  * makes all buffers free and discards any data in buffers.
4843  */
4844 void rx_reset_buffers(SLMP_INFO *info)
4845 {
4846         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4847 }
4848
4849 /* Free the buffers used by a received frame
4850  *
4851  * info   pointer to device instance data
4852  * first  index of 1st receive buffer of frame
4853  * last   index of last receive buffer of frame
4854  */
4855 void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4856 {
4857         int done = 0;
4858
4859         while(!done) {
4860                 /* reset current buffer for reuse */
4861                 info->rx_buf_list[first].status = 0xff;
4862
4863                 if (first == last) {
4864                         done = 1;
4865                         /* set new last rx descriptor address */
4866                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4867                 }
4868
4869                 first++;
4870                 if (first == info->rx_buf_count)
4871                         first = 0;
4872         }
4873
4874         /* set current buffer to next buffer after last buffer of frame */
4875         info->current_rx_buf = first;
4876 }
4877
4878 /* Return a received frame from the receive DMA buffers.
4879  * Only frames received without errors are returned.
4880  *
4881  * Return Value:        1 if frame returned, otherwise 0
4882  */
4883 int rx_get_frame(SLMP_INFO *info)
4884 {
4885         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4886         unsigned short status;
4887         unsigned int framesize = 0;
4888         int ReturnCode = 0;
4889         unsigned long flags;
4890         struct tty_struct *tty = info->tty;
4891         unsigned char addr_field = 0xff;
4892         SCADESC *desc;
4893         SCADESC_EX *desc_ex;
4894
4895 CheckAgain:
4896         /* assume no frame returned, set zero length */
4897         framesize = 0;
4898         addr_field = 0xff;
4899
4900         /*
4901          * current_rx_buf points to the 1st buffer of the next available
4902          * receive frame. To find the last buffer of the frame look for
4903          * a non-zero status field in the buffer entries. (The status
4904          * field is set by the 16C32 after completing a receive frame.
4905          */
4906         StartIndex = EndIndex = info->current_rx_buf;
4907
4908         for ( ;; ) {
4909                 desc = &info->rx_buf_list[EndIndex];
4910                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4911
4912                 if (desc->status == 0xff)
4913                         goto Cleanup;   /* current desc still in use, no frames available */
4914
4915                 if (framesize == 0 && info->params.addr_filter != 0xff)
4916                         addr_field = desc_ex->virt_addr[0];
4917
4918                 framesize += desc->length;
4919
4920                 /* Status != 0 means last buffer of frame */
4921                 if (desc->status)
4922                         break;
4923
4924                 EndIndex++;
4925                 if (EndIndex == info->rx_buf_count)
4926                         EndIndex = 0;
4927
4928                 if (EndIndex == info->current_rx_buf) {
4929                         /* all buffers have been 'used' but none mark      */
4930                         /* the end of a frame. Reset buffers and receiver. */
4931                         if ( info->rx_enabled ){
4932                                 spin_lock_irqsave(&info->lock,flags);
4933                                 rx_start(info);
4934                                 spin_unlock_irqrestore(&info->lock,flags);
4935                         }
4936                         goto Cleanup;
4937                 }
4938
4939         }
4940
4941         /* check status of receive frame */
4942
4943         /* frame status is byte stored after frame data
4944          *
4945          * 7 EOM (end of msg), 1 = last buffer of frame
4946          * 6 Short Frame, 1 = short frame
4947          * 5 Abort, 1 = frame aborted
4948          * 4 Residue, 1 = last byte is partial
4949          * 3 Overrun, 1 = overrun occurred during frame reception
4950          * 2 CRC,     1 = CRC error detected
4951          *
4952          */
4953         status = desc->status;
4954
4955         /* ignore CRC bit if not using CRC (bit is undefined) */
4956         /* Note:CRC is not save to data buffer */
4957         if (info->params.crc_type == HDLC_CRC_NONE)
4958                 status &= ~BIT2;
4959
4960         if (framesize == 0 ||
4961                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4962                 /* discard 0 byte frames, this seems to occur sometime
4963                  * when remote is idling flags.
4964                  */
4965                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4966                 goto CheckAgain;
4967         }
4968
4969         if (framesize < 2)
4970                 status |= BIT6;
4971
4972         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4973                 /* received frame has errors,
4974                  * update counts and mark frame size as 0
4975                  */
4976                 if (status & BIT6)
4977                         info->icount.rxshort++;
4978                 else if (status & BIT5)
4979                         info->icount.rxabort++;
4980                 else if (status & BIT3)
4981                         info->icount.rxover++;
4982                 else
4983                         info->icount.rxcrc++;
4984
4985                 framesize = 0;
4986 #if SYNCLINK_GENERIC_HDLC
4987                 {
4988                         struct net_device_stats *stats = hdlc_stats(info->netdev);
4989                         stats->rx_errors++;
4990                         stats->rx_frame_errors++;
4991                 }
4992 #endif
4993         }
4994
4995         if ( debug_level >= DEBUG_LEVEL_BH )
4996                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4997                         __FILE__,__LINE__,info->device_name,status,framesize);
4998
4999         if ( debug_level >= DEBUG_LEVEL_DATA )
5000                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
5001                         min_t(int, framesize,SCABUFSIZE),0);
5002
5003         if (framesize) {
5004                 if (framesize > info->max_frame_size)
5005                         info->icount.rxlong++;
5006                 else {
5007                         /* copy dma buffer(s) to contiguous intermediate buffer */
5008                         int copy_count = framesize;
5009                         int index = StartIndex;
5010                         unsigned char *ptmp = info->tmp_rx_buf;
5011                         info->tmp_rx_buf_count = framesize;
5012
5013                         info->icount.rxok++;
5014
5015                         while(copy_count) {
5016                                 int partial_count = min(copy_count,SCABUFSIZE);
5017                                 memcpy( ptmp,
5018                                         info->rx_buf_list_ex[index].virt_addr,
5019                                         partial_count );
5020                                 ptmp += partial_count;
5021                                 copy_count -= partial_count;
5022
5023                                 if ( ++index == info->rx_buf_count )
5024                                         index = 0;
5025                         }
5026
5027 #if SYNCLINK_GENERIC_HDLC
5028                         if (info->netcount)
5029                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
5030                         else
5031 #endif
5032                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
5033                                                   info->flag_buf, framesize);
5034                 }
5035         }
5036         /* Free the buffers used by this frame. */
5037         rx_free_frame_buffers( info, StartIndex, EndIndex );
5038
5039         ReturnCode = 1;
5040
5041 Cleanup:
5042         if ( info->rx_enabled && info->rx_overflow ) {
5043                 /* Receiver is enabled, but needs to restarted due to
5044                  * rx buffer overflow. If buffers are empty, restart receiver.
5045                  */
5046                 if (info->rx_buf_list[EndIndex].status == 0xff) {
5047                         spin_lock_irqsave(&info->lock,flags);
5048                         rx_start(info);
5049                         spin_unlock_irqrestore(&info->lock,flags);
5050                 }
5051         }
5052
5053         return ReturnCode;
5054 }
5055
5056 /* load the transmit DMA buffer with data
5057  */
5058 void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5059 {
5060         unsigned short copy_count;
5061         unsigned int i = 0;
5062         SCADESC *desc;
5063         SCADESC_EX *desc_ex;
5064
5065         if ( debug_level >= DEBUG_LEVEL_DATA )
5066                 trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
5067
5068         /* Copy source buffer to one or more DMA buffers, starting with
5069          * the first transmit dma buffer.
5070          */
5071         for(i=0;;)
5072         {
5073                 copy_count = min_t(unsigned short,count,SCABUFSIZE);
5074
5075                 desc = &info->tx_buf_list[i];
5076                 desc_ex = &info->tx_buf_list_ex[i];
5077
5078                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5079
5080                 desc->length = copy_count;
5081                 desc->status = 0;
5082
5083                 buf += copy_count;
5084                 count -= copy_count;
5085
5086                 if (!count)
5087                         break;
5088
5089                 i++;
5090                 if (i >= info->tx_buf_count)
5091                         i = 0;
5092         }
5093
5094         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5095         info->last_tx_buf = ++i;
5096 }
5097
5098 int register_test(SLMP_INFO *info)
5099 {
5100         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5101         static unsigned int count = ARRAY_SIZE(testval);
5102         unsigned int i;
5103         int rc = TRUE;
5104         unsigned long flags;
5105
5106         spin_lock_irqsave(&info->lock,flags);
5107         reset_port(info);
5108
5109         /* assume failure */
5110         info->init_error = DiagStatus_AddressFailure;
5111
5112         /* Write bit patterns to various registers but do it out of */
5113         /* sync, then read back and verify values. */
5114
5115         for (i = 0 ; i < count ; i++) {
5116                 write_reg(info, TMC, testval[i]);
5117                 write_reg(info, IDL, testval[(i+1)%count]);
5118                 write_reg(info, SA0, testval[(i+2)%count]);
5119                 write_reg(info, SA1, testval[(i+3)%count]);
5120
5121                 if ( (read_reg(info, TMC) != testval[i]) ||
5122                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5123                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5124                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5125                 {
5126                         rc = FALSE;
5127                         break;
5128                 }
5129         }
5130
5131         reset_port(info);
5132         spin_unlock_irqrestore(&info->lock,flags);
5133
5134         return rc;
5135 }
5136
5137 int irq_test(SLMP_INFO *info)
5138 {
5139         unsigned long timeout;
5140         unsigned long flags;
5141
5142         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5143
5144         spin_lock_irqsave(&info->lock,flags);
5145         reset_port(info);
5146
5147         /* assume failure */
5148         info->init_error = DiagStatus_IrqFailure;
5149         info->irq_occurred = FALSE;
5150
5151         /* setup timer0 on SCA0 to interrupt */
5152
5153         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5154         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5155
5156         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5157         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5158
5159
5160         /* TMCS, Timer Control/Status Register
5161          *
5162          * 07      CMF, Compare match flag (read only) 1=match
5163          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5164          * 05      Reserved, must be 0
5165          * 04      TME, Timer Enable
5166          * 03..00  Reserved, must be 0
5167          *
5168          * 0101 0000
5169          */
5170         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5171
5172         spin_unlock_irqrestore(&info->lock,flags);
5173
5174         timeout=100;
5175         while( timeout-- && !info->irq_occurred ) {
5176                 msleep_interruptible(10);
5177         }
5178
5179         spin_lock_irqsave(&info->lock,flags);
5180         reset_port(info);
5181         spin_unlock_irqrestore(&info->lock,flags);
5182
5183         return info->irq_occurred;
5184 }
5185
5186 /* initialize individual SCA device (2 ports)
5187  */
5188 static int sca_init(SLMP_INFO *info)
5189 {
5190         /* set wait controller to single mem partition (low), no wait states */
5191         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5192         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5193         write_reg(info, WCRL, 0);       /* wait controller low range */
5194         write_reg(info, WCRM, 0);       /* wait controller mid range */
5195         write_reg(info, WCRH, 0);       /* wait controller high range */
5196
5197         /* DPCR, DMA Priority Control
5198          *
5199          * 07..05  Not used, must be 0
5200          * 04      BRC, bus release condition: 0=all transfers complete
5201          * 03      CCC, channel change condition: 0=every cycle
5202          * 02..00  PR<2..0>, priority 100=round robin
5203          *
5204          * 00000100 = 0x04
5205          */
5206         write_reg(info, DPCR, dma_priority);
5207
5208         /* DMA Master Enable, BIT7: 1=enable all channels */
5209         write_reg(info, DMER, 0x80);
5210
5211         /* enable all interrupt classes */
5212         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5213         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5214         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5215
5216         /* ITCR, interrupt control register
5217          * 07      IPC, interrupt priority, 0=MSCI->DMA
5218          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5219          * 04      VOS, Vector Output, 0=unmodified vector
5220          * 03..00  Reserved, must be 0
5221          */
5222         write_reg(info, ITCR, 0);
5223
5224         return TRUE;
5225 }
5226
5227 /* initialize adapter hardware
5228  */
5229 int init_adapter(SLMP_INFO *info)
5230 {
5231         int i;
5232
5233         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5234         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5235         u32 readval;
5236
5237         info->misc_ctrl_value |= BIT30;
5238         *MiscCtrl = info->misc_ctrl_value;
5239
5240         /*
5241          * Force at least 170ns delay before clearing
5242          * reset bit. Each read from LCR takes at least
5243          * 30ns so 10 times for 300ns to be safe.
5244          */
5245         for(i=0;i<10;i++)
5246                 readval = *MiscCtrl;
5247
5248         info->misc_ctrl_value &= ~BIT30;
5249         *MiscCtrl = info->misc_ctrl_value;
5250
5251         /* init control reg (all DTRs off, all clksel=input) */
5252         info->ctrlreg_value = 0xaa;
5253         write_control_reg(info);
5254
5255         {
5256                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5257                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5258
5259                 switch(read_ahead_count)
5260                 {
5261                 case 16:
5262                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5263                         break;
5264                 case 8:
5265                         lcr1_brdr_value |= BIT5 + BIT4;
5266                         break;
5267                 case 4:
5268                         lcr1_brdr_value |= BIT5 + BIT3;
5269                         break;
5270                 case 0:
5271                         lcr1_brdr_value |= BIT5;
5272                         break;
5273                 }
5274
5275                 *LCR1BRDR = lcr1_brdr_value;
5276                 *MiscCtrl = misc_ctrl_value;
5277         }
5278
5279         sca_init(info->port_array[0]);
5280         sca_init(info->port_array[2]);
5281
5282         return TRUE;
5283 }
5284
5285 /* Loopback an HDLC frame to test the hardware
5286  * interrupt and DMA functions.
5287  */
5288 int loopback_test(SLMP_INFO *info)
5289 {
5290 #define TESTFRAMESIZE 20
5291
5292         unsigned long timeout;
5293         u16 count = TESTFRAMESIZE;
5294         unsigned char buf[TESTFRAMESIZE];
5295         int rc = FALSE;
5296         unsigned long flags;
5297
5298         struct tty_struct *oldtty = info->tty;
5299         u32 speed = info->params.clock_speed;
5300
5301         info->params.clock_speed = 3686400;
5302         info->tty = NULL;
5303
5304         /* assume failure */
5305         info->init_error = DiagStatus_DmaFailure;
5306
5307         /* build and send transmit frame */
5308         for (count = 0; count < TESTFRAMESIZE;++count)
5309                 buf[count] = (unsigned char)count;
5310
5311         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5312
5313         /* program hardware for HDLC and enabled receiver */
5314         spin_lock_irqsave(&info->lock,flags);
5315         hdlc_mode(info);
5316         enable_loopback(info,1);
5317         rx_start(info);
5318         info->tx_count = count;
5319         tx_load_dma_buffer(info,buf,count);
5320         tx_start(info);
5321         spin_unlock_irqrestore(&info->lock,flags);
5322
5323         /* wait for receive complete */
5324         /* Set a timeout for waiting for interrupt. */
5325         for ( timeout = 100; timeout; --timeout ) {
5326                 msleep_interruptible(10);
5327
5328                 if (rx_get_frame(info)) {
5329                         rc = TRUE;
5330                         break;
5331                 }
5332         }
5333
5334         /* verify received frame length and contents */
5335         if (rc == TRUE &&
5336                 ( info->tmp_rx_buf_count != count ||
5337                   memcmp(buf, info->tmp_rx_buf,count))) {
5338                 rc = FALSE;
5339         }
5340
5341         spin_lock_irqsave(&info->lock,flags);
5342         reset_adapter(info);
5343         spin_unlock_irqrestore(&info->lock,flags);
5344
5345         info->params.clock_speed = speed;
5346         info->tty = oldtty;
5347
5348         return rc;
5349 }
5350
5351 /* Perform diagnostics on hardware
5352  */
5353 int adapter_test( SLMP_INFO *info )
5354 {
5355         unsigned long flags;
5356         if ( debug_level >= DEBUG_LEVEL_INFO )
5357                 printk( "%s(%d):Testing device %s\n",
5358                         __FILE__,__LINE__,info->device_name );
5359
5360         spin_lock_irqsave(&info->lock,flags);
5361         init_adapter(info);
5362         spin_unlock_irqrestore(&info->lock,flags);
5363
5364         info->port_array[0]->port_count = 0;
5365
5366         if ( register_test(info->port_array[0]) &&
5367                 register_test(info->port_array[1])) {
5368
5369                 info->port_array[0]->port_count = 2;
5370
5371                 if ( register_test(info->port_array[2]) &&
5372                         register_test(info->port_array[3]) )
5373                         info->port_array[0]->port_count += 2;
5374         }
5375         else {
5376                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5377                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5378                 return -ENODEV;
5379         }
5380
5381         if ( !irq_test(info->port_array[0]) ||
5382                 !irq_test(info->port_array[1]) ||
5383                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5384                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5385                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5386                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5387                 return -ENODEV;
5388         }
5389
5390         if (!loopback_test(info->port_array[0]) ||
5391                 !loopback_test(info->port_array[1]) ||
5392                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5393                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5394                 printk( "%s(%d):DMA test failure for device %s\n",
5395                         __FILE__,__LINE__,info->device_name);
5396                 return -ENODEV;
5397         }
5398
5399         if ( debug_level >= DEBUG_LEVEL_INFO )
5400                 printk( "%s(%d):device %s passed diagnostics\n",
5401                         __FILE__,__LINE__,info->device_name );
5402
5403         info->port_array[0]->init_error = 0;
5404         info->port_array[1]->init_error = 0;
5405         if ( info->port_count > 2 ) {
5406                 info->port_array[2]->init_error = 0;
5407                 info->port_array[3]->init_error = 0;
5408         }
5409
5410         return 0;
5411 }
5412
5413 /* Test the shared memory on a PCI adapter.
5414  */
5415 int memory_test(SLMP_INFO *info)
5416 {
5417         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5418                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5419         unsigned long count = ARRAY_SIZE(testval);
5420         unsigned long i;
5421         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5422         unsigned long * addr = (unsigned long *)info->memory_base;
5423
5424         /* Test data lines with test pattern at one location. */
5425
5426         for ( i = 0 ; i < count ; i++ ) {
5427                 *addr = testval[i];
5428                 if ( *addr != testval[i] )
5429                         return FALSE;
5430         }
5431
5432         /* Test address lines with incrementing pattern over */
5433         /* entire address range. */
5434
5435         for ( i = 0 ; i < limit ; i++ ) {
5436                 *addr = i * 4;
5437                 addr++;
5438         }
5439
5440         addr = (unsigned long *)info->memory_base;
5441
5442         for ( i = 0 ; i < limit ; i++ ) {
5443                 if ( *addr != i * 4 )
5444                         return FALSE;
5445                 addr++;
5446         }
5447
5448         memset( info->memory_base, 0, SCA_MEM_SIZE );
5449         return TRUE;
5450 }
5451
5452 /* Load data into PCI adapter shared memory.
5453  *
5454  * The PCI9050 releases control of the local bus
5455  * after completing the current read or write operation.
5456  *
5457  * While the PCI9050 write FIFO not empty, the
5458  * PCI9050 treats all of the writes as a single transaction
5459  * and does not release the bus. This causes DMA latency problems
5460  * at high speeds when copying large data blocks to the shared memory.
5461  *
5462  * This function breaks a write into multiple transations by
5463  * interleaving a read which flushes the write FIFO and 'completes'
5464  * the write transation. This allows any pending DMA request to gain control
5465  * of the local bus in a timely fasion.
5466  */
5467 void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5468 {
5469         /* A load interval of 16 allows for 4 32-bit writes at */
5470         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5471
5472         unsigned short interval = count / sca_pci_load_interval;
5473         unsigned short i;
5474
5475         for ( i = 0 ; i < interval ; i++ )
5476         {
5477                 memcpy(dest, src, sca_pci_load_interval);
5478                 read_status_reg(info);
5479                 dest += sca_pci_load_interval;
5480                 src += sca_pci_load_interval;
5481         }
5482
5483         memcpy(dest, src, count % sca_pci_load_interval);
5484 }
5485
5486 void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5487 {
5488         int i;
5489         int linecount;
5490         if (xmit)
5491                 printk("%s tx data:\n",info->device_name);
5492         else
5493                 printk("%s rx data:\n",info->device_name);
5494
5495         while(count) {
5496                 if (count > 16)
5497                         linecount = 16;
5498                 else
5499                         linecount = count;
5500
5501                 for(i=0;i<linecount;i++)
5502                         printk("%02X ",(unsigned char)data[i]);
5503                 for(;i<17;i++)
5504                         printk("   ");
5505                 for(i=0;i<linecount;i++) {
5506                         if (data[i]>=040 && data[i]<=0176)
5507                                 printk("%c",data[i]);
5508                         else
5509                                 printk(".");
5510                 }
5511                 printk("\n");
5512
5513                 data  += linecount;
5514                 count -= linecount;
5515         }
5516 }       /* end of trace_block() */
5517
5518 /* called when HDLC frame times out
5519  * update stats and do tx completion processing
5520  */
5521 void tx_timeout(unsigned long context)
5522 {
5523         SLMP_INFO *info = (SLMP_INFO*)context;
5524         unsigned long flags;
5525
5526         if ( debug_level >= DEBUG_LEVEL_INFO )
5527                 printk( "%s(%d):%s tx_timeout()\n",
5528                         __FILE__,__LINE__,info->device_name);
5529         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5530                 info->icount.txtimeout++;
5531         }
5532         spin_lock_irqsave(&info->lock,flags);
5533         info->tx_active = 0;
5534         info->tx_count = info->tx_put = info->tx_get = 0;
5535
5536         spin_unlock_irqrestore(&info->lock,flags);
5537
5538 #if SYNCLINK_GENERIC_HDLC
5539         if (info->netcount)
5540                 hdlcdev_tx_done(info);
5541         else
5542 #endif
5543                 bh_transmit(info);
5544 }
5545
5546 /* called to periodically check the DSR/RI modem signal input status
5547  */
5548 void status_timeout(unsigned long context)
5549 {
5550         u16 status = 0;
5551         SLMP_INFO *info = (SLMP_INFO*)context;
5552         unsigned long flags;
5553         unsigned char delta;
5554
5555
5556         spin_lock_irqsave(&info->lock,flags);
5557         get_signals(info);
5558         spin_unlock_irqrestore(&info->lock,flags);
5559
5560         /* check for DSR/RI state change */
5561
5562         delta = info->old_signals ^ info->serial_signals;
5563         info->old_signals = info->serial_signals;
5564
5565         if (delta & SerialSignal_DSR)
5566                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5567
5568         if (delta & SerialSignal_RI)
5569                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5570
5571         if (delta & SerialSignal_DCD)
5572                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5573
5574         if (delta & SerialSignal_CTS)
5575                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5576
5577         if (status)
5578                 isr_io_pin(info,status);
5579
5580         info->status_timer.data = (unsigned long)info;
5581         info->status_timer.function = status_timeout;
5582         info->status_timer.expires = jiffies + msecs_to_jiffies(10);
5583         add_timer(&info->status_timer);
5584 }
5585
5586
5587 /* Register Access Routines -
5588  * All registers are memory mapped
5589  */
5590 #define CALC_REGADDR() \
5591         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5592         if (info->port_num > 1) \
5593                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5594         if ( info->port_num & 1) { \
5595                 if (Addr > 0x7f) \
5596                         RegAddr += 0x40;        /* DMA access */ \
5597                 else if (Addr > 0x1f && Addr < 0x60) \
5598                         RegAddr += 0x20;        /* MSCI access */ \
5599         }
5600
5601
5602 unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5603 {
5604         CALC_REGADDR();
5605         return *RegAddr;
5606 }
5607 void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5608 {
5609         CALC_REGADDR();
5610         *RegAddr = Value;
5611 }
5612
5613 u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5614 {
5615         CALC_REGADDR();
5616         return *((u16 *)RegAddr);
5617 }
5618
5619 void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5620 {
5621         CALC_REGADDR();
5622         *((u16 *)RegAddr) = Value;
5623 }
5624
5625 unsigned char read_status_reg(SLMP_INFO * info)
5626 {
5627         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5628         return *RegAddr;
5629 }
5630
5631 void write_control_reg(SLMP_INFO * info)
5632 {
5633         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5634         *RegAddr = info->port_array[0]->ctrlreg_value;
5635 }
5636
5637
5638 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5639                                           const struct pci_device_id *ent)
5640 {
5641         if (pci_enable_device(dev)) {
5642                 printk("error enabling pci device %p\n", dev);
5643                 return -EIO;
5644         }
5645         device_init( ++synclinkmp_adapter_count, dev );
5646         return 0;
5647 }
5648
5649 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5650 {
5651 }