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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 #ifdef CONFIG_HDLC_MODULE
  71 #define CONFIG_HDLC 1
  72 #endif
  73
  74 #define GET_USER(error,value,addr) error = get_user(value,addr)
  75 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  76 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  77 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  78
  79 #include <asm/uaccess.h>
  80
  81 #include "linux/synclink.h"
  82
  83 static MGSL_PARAMS default_params = {
  84         MGSL_MODE_HDLC,                 /* unsigned long mode */
  85         0,                              /* unsigned char loopback; */
  86         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  87         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  88         0,                              /* unsigned long clock_speed; */
  89         0xff,                           /* unsigned char addr_filter; */
  90         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  91         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
  92         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
  93         9600,                           /* unsigned long data_rate; */
  94         8,                              /* unsigned char data_bits; */
  95         1,                              /* unsigned char stop_bits; */
  96         ASYNC_PARITY_NONE               /* unsigned char parity; */
  97 };
  98
  99 /* size in bytes of DMA data buffers */
 100 #define SCABUFSIZE      1024
 101 #define SCA_MEM_SIZE    0x40000
 102 #define SCA_BASE_SIZE   512
 103 #define SCA_REG_SIZE    16
 104 #define SCA_MAX_PORTS   4
 105 #define SCAMAXDESC      128
 106
 107 #define BUFFERLISTSIZE  4096
 108
 109 /* SCA-I style DMA buffer descriptor */
 110 typedef struct _SCADESC
 111 {
 112         u16     next;           /* lower l6 bits of next descriptor addr */
 113         u16     buf_ptr;        /* lower 16 bits of buffer addr */
 114         u8      buf_base;       /* upper 8 bits of buffer addr */
 115         u8      pad1;
 116         u16     length;         /* length of buffer */
 117         u8      status;         /* status of buffer */
 118         u8      pad2;
 119 } SCADESC, *PSCADESC;
 120
 121 typedef struct _SCADESC_EX
 122 {
 123         /* device driver bookkeeping section */
 124         char    *virt_addr;     /* virtual address of data buffer */
 125         u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
 126 } SCADESC_EX, *PSCADESC_EX;
 127
 128 /* The queue of BH actions to be performed */
 129
 130 #define BH_RECEIVE  1
 131 #define BH_TRANSMIT 2
 132 #define BH_STATUS   4
 133
 134 #define IO_PIN_SHUTDOWN_LIMIT 100
 135
 136 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 137
 138 struct  _input_signal_events {
 139         int     ri_up;
 140         int     ri_down;
 141         int     dsr_up;
 142         int     dsr_down;
 143         int     dcd_up;
 144         int     dcd_down;
 145         int     cts_up;
 146         int     cts_down;
 147 };
 148
 149 /*
 150  * Device instance data structure
 151  */
 152 typedef struct _synclinkmp_info {
 153         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
 154         int                     magic;
 155         int                     flags;
 156         int                     count;          /* count of opens */
 157         int                     line;
 158         unsigned short          close_delay;
 159         unsigned short          closing_wait;   /* time to wait before closing */
 160
 161         struct mgsl_icount      icount;
 162
 163         struct tty_struct       *tty;
 164         int                     timeout;
 165         int                     x_char;         /* xon/xoff character */
 166         int                     blocked_open;   /* # of blocked opens */
 167         u16                     read_status_mask1;  /* break detection (SR1 indications) */
 168         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
 169         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
 170         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
 171         unsigned char           *tx_buf;
 172         int                     tx_put;
 173         int                     tx_get;
 174         int                     tx_count;
 175
 176         wait_queue_head_t       open_wait;
 177         wait_queue_head_t       close_wait;
 178
 179         wait_queue_head_t       status_event_wait_q;
 180         wait_queue_head_t       event_wait_q;
 181         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 182         struct _synclinkmp_info *next_device;   /* device list link */
 183         struct timer_list       status_timer;   /* input signal status check timer */
 184
 185         spinlock_t lock;                /* spinlock for synchronizing with ISR */
 186         struct work_struct task;                        /* task structure for scheduling bh */
 187
 188         u32 max_frame_size;                     /* as set by device config */
 189
 190         u32 pending_bh;
 191
 192         int bh_running;                         /* Protection from multiple */
 193         int isr_overflow;
 194         int bh_requested;
 195
 196         int dcd_chkcount;                       /* check counts to prevent */
 197         int cts_chkcount;                       /* too many IRQs if a signal */
 198         int dsr_chkcount;                       /* is floating */
 199         int ri_chkcount;
 200
 201         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
 202         unsigned long buffer_list_phys;
 203
 204         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
 205         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
 206         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
 207         unsigned int current_rx_buf;
 208
 209         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
 210         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
 211         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
 212         unsigned int last_tx_buf;
 213
 214         unsigned char *tmp_rx_buf;
 215         unsigned int tmp_rx_buf_count;
 216
 217         int rx_enabled;
 218         int rx_overflow;
 219
 220         int tx_enabled;
 221         int tx_active;
 222         u32 idle_mode;
 223
 224         unsigned char ie0_value;
 225         unsigned char ie1_value;
 226         unsigned char ie2_value;
 227         unsigned char ctrlreg_value;
 228         unsigned char old_signals;
 229
 230         char device_name[25];                   /* device instance name */
 231
 232         int port_count;
 233         int adapter_num;
 234         int port_num;
 235
 236         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
 237
 238         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
 239
 240         unsigned int irq_level;                 /* interrupt level */
 241         unsigned long irq_flags;
 242         int irq_requested;                      /* nonzero if IRQ requested */
 243
 244         MGSL_PARAMS params;                     /* communications parameters */
 245
 246         unsigned char serial_signals;           /* current serial signal states */
 247
 248         int irq_occurred;                       /* for diagnostics use */
 249         unsigned int init_error;                /* Initialization startup error */
 250
 251         u32 last_mem_alloc;
 252         unsigned char* memory_base;             /* shared memory address (PCI only) */
 253         u32 phys_memory_base;
 254         int shared_mem_requested;
 255
 256         unsigned char* sca_base;                /* HD64570 SCA Memory address */
 257         u32 phys_sca_base;
 258         u32 sca_offset;
 259         int sca_base_requested;
 260
 261         unsigned char* lcr_base;                /* local config registers (PCI only) */
 262         u32 phys_lcr_base;
 263         u32 lcr_offset;
 264         int lcr_mem_requested;
 265
 266         unsigned char* statctrl_base;           /* status/control register memory */
 267         u32 phys_statctrl_base;
 268         u32 statctrl_offset;
 269         int sca_statctrl_requested;
 270
 271         u32 misc_ctrl_value;
 272         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 273         char char_buf[MAX_ASYNC_BUFFER_SIZE];
 274         BOOLEAN drop_rts_on_tx_done;
 275
 276         struct  _input_signal_events    input_signal_events;
 277
 278         /* SPPP/Cisco HDLC device parts */
 279         int netcount;
 280         int dosyncppp;
 281         spinlock_t netlock;
 282
 283 #ifdef CONFIG_HDLC
 284         struct net_device *netdev;
 285 #endif
 286
 287 } SLMP_INFO;
 288
 289 #define MGSL_MAGIC 0x5401
 290
 291 /*
 292  * define serial signal status change macros
 293  */
 294 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
 295 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
 296 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
 297 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
 298
 299 /* Common Register macros */
 300 #define LPR     0x00
 301 #define PABR0   0x02
 302 #define PABR1   0x03
 303 #define WCRL    0x04
 304 #define WCRM    0x05
 305 #define WCRH    0x06
 306 #define DPCR    0x08
 307 #define DMER    0x09
 308 #define ISR0    0x10
 309 #define ISR1    0x11
 310 #define ISR2    0x12
 311 #define IER0    0x14
 312 #define IER1    0x15
 313 #define IER2    0x16
 314 #define ITCR    0x18
 315 #define INTVR   0x1a
 316 #define IMVR    0x1c
 317
 318 /* MSCI Register macros */
 319 #define TRB     0x20
 320 #define TRBL    0x20
 321 #define TRBH    0x21
 322 #define SR0     0x22
 323 #define SR1     0x23
 324 #define SR2     0x24
 325 #define SR3     0x25
 326 #define FST     0x26
 327 #define IE0     0x28
 328 #define IE1     0x29
 329 #define IE2     0x2a
 330 #define FIE     0x2b
 331 #define CMD     0x2c
 332 #define MD0     0x2e
 333 #define MD1     0x2f
 334 #define MD2     0x30
 335 #define CTL     0x31
 336 #define SA0     0x32
 337 #define SA1     0x33
 338 #define IDL     0x34
 339 #define TMC     0x35
 340 #define RXS     0x36
 341 #define TXS     0x37
 342 #define TRC0    0x38
 343 #define TRC1    0x39
 344 #define RRC     0x3a
 345 #define CST0    0x3c
 346 #define CST1    0x3d
 347
 348 /* Timer Register Macros */
 349 #define TCNT    0x60
 350 #define TCNTL   0x60
 351 #define TCNTH   0x61
 352 #define TCONR   0x62
 353 #define TCONRL  0x62
 354 #define TCONRH  0x63
 355 #define TMCS    0x64
 356 #define TEPR    0x65
 357
 358 /* DMA Controller Register macros */
 359 #define DARL    0x80
 360 #define DARH    0x81
 361 #define DARB    0x82
 362 #define BAR     0x80
 363 #define BARL    0x80
 364 #define BARH    0x81
 365 #define BARB    0x82
 366 #define SAR     0x84
 367 #define SARL    0x84
 368 #define SARH    0x85
 369 #define SARB    0x86
 370 #define CPB     0x86
 371 #define CDA     0x88
 372 #define CDAL    0x88
 373 #define CDAH    0x89
 374 #define EDA     0x8a
 375 #define EDAL    0x8a
 376 #define EDAH    0x8b
 377 #define BFL     0x8c
 378 #define BFLL    0x8c
 379 #define BFLH    0x8d
 380 #define BCR     0x8e
 381 #define BCRL    0x8e
 382 #define BCRH    0x8f
 383 #define DSR     0x90
 384 #define DMR     0x91
 385 #define FCT     0x93
 386 #define DIR     0x94
 387 #define DCMD    0x95
 388
 389 /* combine with timer or DMA register address */
 390 #define TIMER0  0x00
 391 #define TIMER1  0x08
 392 #define TIMER2  0x10
 393 #define TIMER3  0x18
 394 #define RXDMA   0x00
 395 #define TXDMA   0x20
 396
 397 /* SCA Command Codes */
 398 #define NOOP            0x00
 399 #define TXRESET         0x01
 400 #define TXENABLE        0x02
 401 #define TXDISABLE       0x03
 402 #define TXCRCINIT       0x04
 403 #define TXCRCEXCL       0x05
 404 #define TXEOM           0x06
 405 #define TXABORT         0x07
 406 #define MPON            0x08
 407 #define TXBUFCLR        0x09
 408 #define RXRESET         0x11
 409 #define RXENABLE        0x12
 410 #define RXDISABLE       0x13
 411 #define RXCRCINIT       0x14
 412 #define RXREJECT        0x15
 413 #define SEARCHMP        0x16
 414 #define RXCRCEXCL       0x17
 415 #define RXCRCCALC       0x18
 416 #define CHRESET         0x21
 417 #define HUNT            0x31
 418
 419 /* DMA command codes */
 420 #define SWABORT         0x01
 421 #define FEICLEAR        0x02
 422
 423 /* IE0 */
 424 #define TXINTE          BIT7
 425 #define RXINTE          BIT6
 426 #define TXRDYE          BIT1
 427 #define RXRDYE          BIT0
 428
 429 /* IE1 & SR1 */
 430 #define UDRN    BIT7
 431 #define IDLE    BIT6
 432 #define SYNCD   BIT4
 433 #define FLGD    BIT4
 434 #define CCTS    BIT3
 435 #define CDCD    BIT2
 436 #define BRKD    BIT1
 437 #define ABTD    BIT1
 438 #define GAPD    BIT1
 439 #define BRKE    BIT0
 440 #define IDLD    BIT0
 441
 442 /* IE2 & SR2 */
 443 #define EOM     BIT7
 444 #define PMP     BIT6
 445 #define SHRT    BIT6
 446 #define PE      BIT5
 447 #define ABT     BIT5
 448 #define FRME    BIT4
 449 #define RBIT    BIT4
 450 #define OVRN    BIT3
 451 #define CRCE    BIT2
 452
 453
 454 /*
 455  * Global linked list of SyncLink devices
 456  */
 457 static SLMP_INFO *synclinkmp_device_list = NULL;
 458 static int synclinkmp_adapter_count = -1;
 459 static int synclinkmp_device_count = 0;
 460
 461 /*
 462  * Set this param to non-zero to load eax with the
 463  * .text section address and breakpoint on module load.
 464  * This is useful for use with gdb and add-symbol-file command.
 465  */
 466 static int break_on_load=0;
 467
 468 /*
 469  * Driver major number, defaults to zero to get auto
 470  * assigned major number. May be forced as module parameter.
 471  */
 472 static int ttymajor=0;
 473
 474 /*
 475  * Array of user specified options for ISA adapters.
 476  */
 477 static int debug_level = 0;
 478 static int maxframe[MAX_DEVICES] = {0,};
 479 static int dosyncppp[MAX_DEVICES] = {0,};
 480
 481 module_param(break_on_load, bool, 0);
 482 module_param(ttymajor, int, 0);
 483 module_param(debug_level, int, 0);
 484 module_param_array(maxframe, int, NULL, 0);
 485 module_param_array(dosyncppp, int, NULL, 0);
 486
 487 static char *driver_name = "SyncLink MultiPort driver";
 488 static char *driver_version = "$Revision: 4.38 $";
 489
 490 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 491 static void synclinkmp_remove_one(struct pci_dev *dev);
 492
 493 static struct pci_device_id synclinkmp_pci_tbl[] = {
 494         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
 495         { 0, }, /* terminate list */
 496 };
 497 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
 498
 499 MODULE_LICENSE("GPL");
 500
 501 static struct pci_driver synclinkmp_pci_driver = {
 502         .name           = "synclinkmp",
 503         .id_table       = synclinkmp_pci_tbl,
 504         .probe          = synclinkmp_init_one,
 505         .remove         = __devexit_p(synclinkmp_remove_one),
 506 };
 507
 508
 509 static struct tty_driver *serial_driver;
 510
 511 /* number of characters left in xmit buffer before we ask for more */
 512 #define WAKEUP_CHARS 256
 513
 514
 515 /* tty callbacks */
 516
 517 static int  open(struct tty_struct *tty, struct file * filp);
 518 static void close(struct tty_struct *tty, struct file * filp);
 519 static void hangup(struct tty_struct *tty);
 520 static void set_termios(struct tty_struct *tty, struct termios *old_termios);
 521
 522 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 523 static void put_char(struct tty_struct *tty, unsigned char ch);
 524 static void send_xchar(struct tty_struct *tty, char ch);
 525 static void wait_until_sent(struct tty_struct *tty, int timeout);
 526 static int  write_room(struct tty_struct *tty);
 527 static void flush_chars(struct tty_struct *tty);
 528 static void flush_buffer(struct tty_struct *tty);
 529 static void tx_hold(struct tty_struct *tty);
 530 static void tx_release(struct tty_struct *tty);
 531
 532 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
 533 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
 534 static int  chars_in_buffer(struct tty_struct *tty);
 535 static void throttle(struct tty_struct * tty);
 536 static void unthrottle(struct tty_struct * tty);
 537 static void set_break(struct tty_struct *tty, int break_state);
 538
 539 #ifdef CONFIG_HDLC
 540 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 541 static void hdlcdev_tx_done(SLMP_INFO *info);
 542 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
 543 static int  hdlcdev_init(SLMP_INFO *info);
 544 static void hdlcdev_exit(SLMP_INFO *info);
 545 #endif
 546
 547 /* ioctl handlers */
 548
 549 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
 550 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 551 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 552 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
 553 static int  set_txidle(SLMP_INFO *info, int idle_mode);
 554 static int  tx_enable(SLMP_INFO *info, int enable);
 555 static int  tx_abort(SLMP_INFO *info);
 556 static int  rx_enable(SLMP_INFO *info, int enable);
 557 static int  modem_input_wait(SLMP_INFO *info,int arg);
 558 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
 559 static int  tiocmget(struct tty_struct *tty, struct file *file);
 560 static int  tiocmset(struct tty_struct *tty, struct file *file,
 561                      unsigned int set, unsigned int clear);
 562 static void set_break(struct tty_struct *tty, int break_state);
 563
 564 static void add_device(SLMP_INFO *info);
 565 static void device_init(int adapter_num, struct pci_dev *pdev);
 566 static int  claim_resources(SLMP_INFO *info);
 567 static void release_resources(SLMP_INFO *info);
 568
 569 static int  startup(SLMP_INFO *info);
 570 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
 571 static void shutdown(SLMP_INFO *info);
 572 static void program_hw(SLMP_INFO *info);
 573 static void change_params(SLMP_INFO *info);
 574
 575 static int  init_adapter(SLMP_INFO *info);
 576 static int  register_test(SLMP_INFO *info);
 577 static int  irq_test(SLMP_INFO *info);
 578 static int  loopback_test(SLMP_INFO *info);
 579 static int  adapter_test(SLMP_INFO *info);
 580 static int  memory_test(SLMP_INFO *info);
 581
 582 static void reset_adapter(SLMP_INFO *info);
 583 static void reset_port(SLMP_INFO *info);
 584 static void async_mode(SLMP_INFO *info);
 585 static void hdlc_mode(SLMP_INFO *info);
 586
 587 static void rx_stop(SLMP_INFO *info);
 588 static void rx_start(SLMP_INFO *info);
 589 static void rx_reset_buffers(SLMP_INFO *info);
 590 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
 591 static int  rx_get_frame(SLMP_INFO *info);
 592
 593 static void tx_start(SLMP_INFO *info);
 594 static void tx_stop(SLMP_INFO *info);
 595 static void tx_load_fifo(SLMP_INFO *info);
 596 static void tx_set_idle(SLMP_INFO *info);
 597 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
 598
 599 static void get_signals(SLMP_INFO *info);
 600 static void set_signals(SLMP_INFO *info);
 601 static void enable_loopback(SLMP_INFO *info, int enable);
 602 static void set_rate(SLMP_INFO *info, u32 data_rate);
 603
 604 static int  bh_action(SLMP_INFO *info);
 605 static void bh_handler(void* Context);
 606 static void bh_receive(SLMP_INFO *info);
 607 static void bh_transmit(SLMP_INFO *info);
 608 static void bh_status(SLMP_INFO *info);
 609 static void isr_timer(SLMP_INFO *info);
 610 static void isr_rxint(SLMP_INFO *info);
 611 static void isr_rxrdy(SLMP_INFO *info);
 612 static void isr_txint(SLMP_INFO *info);
 613 static void isr_txrdy(SLMP_INFO *info);
 614 static void isr_rxdmaok(SLMP_INFO *info);
 615 static void isr_rxdmaerror(SLMP_INFO *info);
 616 static void isr_txdmaok(SLMP_INFO *info);
 617 static void isr_txdmaerror(SLMP_INFO *info);
 618 static void isr_io_pin(SLMP_INFO *info, u16 status);
 619
 620 static int  alloc_dma_bufs(SLMP_INFO *info);
 621 static void free_dma_bufs(SLMP_INFO *info);
 622 static int  alloc_buf_list(SLMP_INFO *info);
 623 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
 624 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
 625 static void free_tmp_rx_buf(SLMP_INFO *info);
 626
 627 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
 628 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
 629 static void tx_timeout(unsigned long context);
 630 static void status_timeout(unsigned long context);
 631
 632 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
 633 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
 634 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
 635 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
 636 static unsigned char read_status_reg(SLMP_INFO * info);
 637 static void write_control_reg(SLMP_INFO * info);
 638
 639
 640 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
 641 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
 642 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
 643
 644 static u32 misc_ctrl_value = 0x007e4040;
 645 static u32 lcr1_brdr_value = 0x00800028;
 646
 647 static u32 read_ahead_count = 8;
 648
 649 /* DPCR, DMA Priority Control
 650  *
 651  * 07..05  Not used, must be 0
 652  * 04      BRC, bus release condition: 0=all transfers complete
 653  *              1=release after 1 xfer on all channels
 654  * 03      CCC, channel change condition: 0=every cycle
 655  *              1=after each channel completes all xfers
 656  * 02..00  PR<2..0>, priority 100=round robin
 657  *
 658  * 00000100 = 0x00
 659  */
 660 static unsigned char dma_priority = 0x04;
 661
 662 // Number of bytes that can be written to shared RAM
 663 // in a single write operation
 664 static u32 sca_pci_load_interval = 64;
 665
 666 /*
 667  * 1st function defined in .text section. Calling this function in
 668  * init_module() followed by a breakpoint allows a remote debugger
 669  * (gdb) to get the .text address for the add-symbol-file command.
 670  * This allows remote debugging of dynamically loadable modules.
 671  */
 672 static void* synclinkmp_get_text_ptr(void);
 673 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
 674
 675 static inline int sanity_check(SLMP_INFO *info,
 676                                char *name, const char *routine)
 677 {
 678 #ifdef SANITY_CHECK
 679         static const char *badmagic =
 680                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
 681         static const char *badinfo =
 682                 "Warning: null synclinkmp_struct for (%s) in %s\n";
 683
 684         if (!info) {
 685                 printk(badinfo, name, routine);
 686                 return 1;
 687         }
 688         if (info->magic != MGSL_MAGIC) {
 689                 printk(badmagic, name, routine);
 690                 return 1;
 691         }
 692 #else
 693         if (!info)
 694                 return 1;
 695 #endif
 696         return 0;
 697 }
 698
 699 /**
 700  * line discipline callback wrappers
 701  *
 702  * The wrappers maintain line discipline references
 703  * while calling into the line discipline.
 704  *
 705  * ldisc_receive_buf  - pass receive data to line discipline
 706  */
 707
 708 static void ldisc_receive_buf(struct tty_struct *tty,
 709                               const __u8 *data, char *flags, int count)
 710 {
 711         struct tty_ldisc *ld;
 712         if (!tty)
 713                 return;
 714         ld = tty_ldisc_ref(tty);
 715         if (ld) {
 716                 if (ld->receive_buf)
 717                         ld->receive_buf(tty, data, flags, count);
 718                 tty_ldisc_deref(ld);
 719         }
 720 }
 721
 722 /* tty callbacks */
 723
 724 /* Called when a port is opened.  Init and enable port.
 725  */
 726 static int open(struct tty_struct *tty, struct file *filp)
 727 {
 728         SLMP_INFO *info;
 729         int retval, line;
 730         unsigned long flags;
 731
 732         line = tty->index;
 733         if ((line < 0) || (line >= synclinkmp_device_count)) {
 734                 printk("%s(%d): open with invalid line #%d.\n",
 735                         __FILE__,__LINE__,line);
 736                 return -ENODEV;
 737         }
 738
 739         info = synclinkmp_device_list;
 740         while(info && info->line != line)
 741                 info = info->next_device;
 742         if (sanity_check(info, tty->name, "open"))
 743                 return -ENODEV;
 744         if ( info->init_error ) {
 745                 printk("%s(%d):%s device is not allocated, init error=%d\n",
 746                         __FILE__,__LINE__,info->device_name,info->init_error);
 747                 return -ENODEV;
 748         }
 749
 750         tty->driver_data = info;
 751         info->tty = tty;
 752
 753         if (debug_level >= DEBUG_LEVEL_INFO)
 754                 printk("%s(%d):%s open(), old ref count = %d\n",
 755                          __FILE__,__LINE__,tty->driver->name, info->count);
 756
 757         /* If port is closing, signal caller to try again */
 758         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
 759                 if (info->flags & ASYNC_CLOSING)
 760                         interruptible_sleep_on(&info->close_wait);
 761                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
 762                         -EAGAIN : -ERESTARTSYS);
 763                 goto cleanup;
 764         }
 765
 766         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 767
 768         spin_lock_irqsave(&info->netlock, flags);
 769         if (info->netcount) {
 770                 retval = -EBUSY;
 771                 spin_unlock_irqrestore(&info->netlock, flags);
 772                 goto cleanup;
 773         }
 774         info->count++;
 775         spin_unlock_irqrestore(&info->netlock, flags);
 776
 777         if (info->count == 1) {
 778                 /* 1st open on this device, init hardware */
 779                 retval = startup(info);
 780                 if (retval < 0)
 781                         goto cleanup;
 782         }
 783
 784         retval = block_til_ready(tty, filp, info);
 785         if (retval) {
 786                 if (debug_level >= DEBUG_LEVEL_INFO)
 787                         printk("%s(%d):%s block_til_ready() returned %d\n",
 788                                  __FILE__,__LINE__, info->device_name, retval);
 789                 goto cleanup;
 790         }
 791
 792         if (debug_level >= DEBUG_LEVEL_INFO)
 793                 printk("%s(%d):%s open() success\n",
 794                          __FILE__,__LINE__, info->device_name);
 795         retval = 0;
 796
 797 cleanup:
 798         if (retval) {
 799                 if (tty->count == 1)
 800                         info->tty = NULL; /* tty layer will release tty struct */
 801                 if(info->count)
 802                         info->count--;
 803         }
 804
 805         return retval;
 806 }
 807
 808 /* Called when port is closed. Wait for remaining data to be
 809  * sent. Disable port and free resources.
 810  */
 811 static void close(struct tty_struct *tty, struct file *filp)
 812 {
 813         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
 814
 815         if (sanity_check(info, tty->name, "close"))
 816                 return;
 817
 818         if (debug_level >= DEBUG_LEVEL_INFO)
 819                 printk("%s(%d):%s close() entry, count=%d\n",
 820                          __FILE__,__LINE__, info->device_name, info->count);
 821
 822         if (!info->count)
 823                 return;
 824
 825         if (tty_hung_up_p(filp))
 826                 goto cleanup;
 827
 828         if ((tty->count == 1) && (info->count != 1)) {
 829                 /*
 830                  * tty->count is 1 and the tty structure will be freed.
 831                  * info->count should be one in this case.
 832                  * if it's not, correct it so that the port is shutdown.
 833                  */
 834                 printk("%s(%d):%s close: bad refcount; tty->count is 1, "
 835                        "info->count is %d\n",
 836                          __FILE__,__LINE__, info->device_name, info->count);
 837                 info->count = 1;
 838         }
 839
 840         info->count--;
 841
 842         /* if at least one open remaining, leave hardware active */
 843         if (info->count)
 844                 goto cleanup;
 845
 846         info->flags |= ASYNC_CLOSING;
 847
 848         /* set tty->closing to notify line discipline to
 849          * only process XON/XOFF characters. Only the N_TTY
 850          * discipline appears to use this (ppp does not).
 851          */
 852         tty->closing = 1;
 853
 854         /* wait for transmit data to clear all layers */
 855
 856         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
 857                 if (debug_level >= DEBUG_LEVEL_INFO)
 858                         printk("%s(%d):%s close() calling tty_wait_until_sent\n",
 859                                  __FILE__,__LINE__, info->device_name );
 860                 tty_wait_until_sent(tty, info->closing_wait);
 861         }
 862
 863         if (info->flags & ASYNC_INITIALIZED)
 864                 wait_until_sent(tty, info->timeout);
 865
 866         if (tty->driver->flush_buffer)
 867                 tty->driver->flush_buffer(tty);
 868
 869         tty_ldisc_flush(tty);
 870
 871         shutdown(info);
 872
 873         tty->closing = 0;
 874         info->tty = NULL;
 875
 876         if (info->blocked_open) {
 877                 if (info->close_delay) {
 878                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
 879                 }
 880                 wake_up_interruptible(&info->open_wait);
 881         }
 882
 883         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 884
 885         wake_up_interruptible(&info->close_wait);
 886
 887 cleanup:
 888         if (debug_level >= DEBUG_LEVEL_INFO)
 889                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
 890                         tty->driver->name, info->count);
 891 }
 892
 893 /* Called by tty_hangup() when a hangup is signaled.
 894  * This is the same as closing all open descriptors for the port.
 895  */
 896 static void hangup(struct tty_struct *tty)
 897 {
 898         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 899
 900         if (debug_level >= DEBUG_LEVEL_INFO)
 901                 printk("%s(%d):%s hangup()\n",
 902                          __FILE__,__LINE__, info->device_name );
 903
 904         if (sanity_check(info, tty->name, "hangup"))
 905                 return;
 906
 907         flush_buffer(tty);
 908         shutdown(info);
 909
 910         info->count = 0;
 911         info->flags &= ~ASYNC_NORMAL_ACTIVE;
 912         info->tty = NULL;
 913
 914         wake_up_interruptible(&info->open_wait);
 915 }
 916
 917 /* Set new termios settings
 918  */
 919 static void set_termios(struct tty_struct *tty, struct termios *old_termios)
 920 {
 921         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 922         unsigned long flags;
 923
 924         if (debug_level >= DEBUG_LEVEL_INFO)
 925                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
 926                         tty->driver->name );
 927
 928         /* just return if nothing has changed */
 929         if ((tty->termios->c_cflag == old_termios->c_cflag)
 930             && (RELEVANT_IFLAG(tty->termios->c_iflag)
 931                 == RELEVANT_IFLAG(old_termios->c_iflag)))
 932           return;
 933
 934         change_params(info);
 935
 936         /* Handle transition to B0 status */
 937         if (old_termios->c_cflag & CBAUD &&
 938             !(tty->termios->c_cflag & CBAUD)) {
 939                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
 940                 spin_lock_irqsave(&info->lock,flags);
 941                 set_signals(info);
 942                 spin_unlock_irqrestore(&info->lock,flags);
 943         }
 944
 945         /* Handle transition away from B0 status */
 946         if (!(old_termios->c_cflag & CBAUD) &&
 947             tty->termios->c_cflag & CBAUD) {
 948                 info->serial_signals |= SerialSignal_DTR;
 949                 if (!(tty->termios->c_cflag & CRTSCTS) ||
 950                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 951                         info->serial_signals |= SerialSignal_RTS;
 952                 }
 953                 spin_lock_irqsave(&info->lock,flags);
 954                 set_signals(info);
 955                 spin_unlock_irqrestore(&info->lock,flags);
 956         }
 957
 958         /* Handle turning off CRTSCTS */
 959         if (old_termios->c_cflag & CRTSCTS &&
 960             !(tty->termios->c_cflag & CRTSCTS)) {
 961                 tty->hw_stopped = 0;
 962                 tx_release(tty);
 963         }
 964 }
 965
 966 /* Send a block of data
 967  *
 968  * Arguments:
 969  *
 970  *      tty             pointer to tty information structure
 971  *      buf             pointer to buffer containing send data
 972  *      count           size of send data in bytes
 973  *
 974  * Return Value:        number of characters written
 975  */
 976 static int write(struct tty_struct *tty,
 977                  const unsigned char *buf, int count)
 978 {
 979         int     c, ret = 0;
 980         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 981         unsigned long flags;
 982
 983         if (debug_level >= DEBUG_LEVEL_INFO)
 984                 printk("%s(%d):%s write() count=%d\n",
 985                        __FILE__,__LINE__,info->device_name,count);
 986
 987         if (sanity_check(info, tty->name, "write"))
 988                 goto cleanup;
 989
 990         if (!info->tx_buf)
 991                 goto cleanup;
 992
 993         if (info->params.mode == MGSL_MODE_HDLC) {
 994                 if (count > info->max_frame_size) {
 995                         ret = -EIO;
 996                         goto cleanup;
 997                 }
 998                 if (info->tx_active)
 999                         goto cleanup;
1000                 if (info->tx_count) {
1001                         /* send accumulated data from send_char() calls */
1002                         /* as frame and wait before accepting more data. */
1003                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1004                         goto start;
1005                 }
1006                 ret = info->tx_count = count;
1007                 tx_load_dma_buffer(info, buf, count);
1008                 goto start;
1009         }
1010
1011         for (;;) {
1012                 c = min_t(int, count,
1013                         min(info->max_frame_size - info->tx_count - 1,
1014                             info->max_frame_size - info->tx_put));
1015                 if (c <= 0)
1016                         break;
1017
1018                 memcpy(info->tx_buf + info->tx_put, buf, c);
1019
1020                 spin_lock_irqsave(&info->lock,flags);
1021                 info->tx_put += c;
1022                 if (info->tx_put >= info->max_frame_size)
1023                         info->tx_put -= info->max_frame_size;
1024                 info->tx_count += c;
1025                 spin_unlock_irqrestore(&info->lock,flags);
1026
1027                 buf += c;
1028                 count -= c;
1029                 ret += c;
1030         }
1031
1032         if (info->params.mode == MGSL_MODE_HDLC) {
1033                 if (count) {
1034                         ret = info->tx_count = 0;
1035                         goto cleanup;
1036                 }
1037                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1038         }
1039 start:
1040         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1041                 spin_lock_irqsave(&info->lock,flags);
1042                 if (!info->tx_active)
1043                         tx_start(info);
1044                 spin_unlock_irqrestore(&info->lock,flags);
1045         }
1046
1047 cleanup:
1048         if (debug_level >= DEBUG_LEVEL_INFO)
1049                 printk( "%s(%d):%s write() returning=%d\n",
1050                         __FILE__,__LINE__,info->device_name,ret);
1051         return ret;
1052 }
1053
1054 /* Add a character to the transmit buffer.
1055  */
1056 static void put_char(struct tty_struct *tty, unsigned char ch)
1057 {
1058         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1059         unsigned long flags;
1060
1061         if ( debug_level >= DEBUG_LEVEL_INFO ) {
1062                 printk( "%s(%d):%s put_char(%d)\n",
1063                         __FILE__,__LINE__,info->device_name,ch);
1064         }
1065
1066         if (sanity_check(info, tty->name, "put_char"))
1067                 return;
1068
1069         if (!info->tx_buf)
1070                 return;
1071
1072         spin_lock_irqsave(&info->lock,flags);
1073
1074         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1075              !info->tx_active ) {
1076
1077                 if (info->tx_count < info->max_frame_size - 1) {
1078                         info->tx_buf[info->tx_put++] = ch;
1079                         if (info->tx_put >= info->max_frame_size)
1080                                 info->tx_put -= info->max_frame_size;
1081                         info->tx_count++;
1082                 }
1083         }
1084
1085         spin_unlock_irqrestore(&info->lock,flags);
1086 }
1087
1088 /* Send a high-priority XON/XOFF character
1089  */
1090 static void send_xchar(struct tty_struct *tty, char ch)
1091 {
1092         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1093         unsigned long flags;
1094
1095         if (debug_level >= DEBUG_LEVEL_INFO)
1096                 printk("%s(%d):%s send_xchar(%d)\n",
1097                          __FILE__,__LINE__, info->device_name, ch );
1098
1099         if (sanity_check(info, tty->name, "send_xchar"))
1100                 return;
1101
1102         info->x_char = ch;
1103         if (ch) {
1104                 /* Make sure transmit interrupts are on */
1105                 spin_lock_irqsave(&info->lock,flags);
1106                 if (!info->tx_enabled)
1107                         tx_start(info);
1108                 spin_unlock_irqrestore(&info->lock,flags);
1109         }
1110 }
1111
1112 /* Wait until the transmitter is empty.
1113  */
1114 static void wait_until_sent(struct tty_struct *tty, int timeout)
1115 {
1116         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1117         unsigned long orig_jiffies, char_time;
1118
1119         if (!info )
1120                 return;
1121
1122         if (debug_level >= DEBUG_LEVEL_INFO)
1123                 printk("%s(%d):%s wait_until_sent() entry\n",
1124                          __FILE__,__LINE__, info->device_name );
1125
1126         if (sanity_check(info, tty->name, "wait_until_sent"))
1127                 return;
1128
1129         if (!(info->flags & ASYNC_INITIALIZED))
1130                 goto exit;
1131
1132         orig_jiffies = jiffies;
1133
1134         /* Set check interval to 1/5 of estimated time to
1135          * send a character, and make it at least 1. The check
1136          * interval should also be less than the timeout.
1137          * Note: use tight timings here to satisfy the NIST-PCTS.
1138          */
1139
1140         if ( info->params.data_rate ) {
1141                 char_time = info->timeout/(32 * 5);
1142                 if (!char_time)
1143                         char_time++;
1144         } else
1145                 char_time = 1;
1146
1147         if (timeout)
1148                 char_time = min_t(unsigned long, char_time, timeout);
1149
1150         if ( info->params.mode == MGSL_MODE_HDLC ) {
1151                 while (info->tx_active) {
1152                         msleep_interruptible(jiffies_to_msecs(char_time));
1153                         if (signal_pending(current))
1154                                 break;
1155                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1156                                 break;
1157                 }
1158         } else {
1159                 //TODO: determine if there is something similar to USC16C32
1160                 //      TXSTATUS_ALL_SENT status
1161                 while ( info->tx_active && info->tx_enabled) {
1162                         msleep_interruptible(jiffies_to_msecs(char_time));
1163                         if (signal_pending(current))
1164                                 break;
1165                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1166                                 break;
1167                 }
1168         }
1169
1170 exit:
1171         if (debug_level >= DEBUG_LEVEL_INFO)
1172                 printk("%s(%d):%s wait_until_sent() exit\n",
1173                          __FILE__,__LINE__, info->device_name );
1174 }
1175
1176 /* Return the count of free bytes in transmit buffer
1177  */
1178 static int write_room(struct tty_struct *tty)
1179 {
1180         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1181         int ret;
1182
1183         if (sanity_check(info, tty->name, "write_room"))
1184                 return 0;
1185
1186         if (info->params.mode == MGSL_MODE_HDLC) {
1187                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1188         } else {
1189                 ret = info->max_frame_size - info->tx_count - 1;
1190                 if (ret < 0)
1191                         ret = 0;
1192         }
1193
1194         if (debug_level >= DEBUG_LEVEL_INFO)
1195                 printk("%s(%d):%s write_room()=%d\n",
1196                        __FILE__, __LINE__, info->device_name, ret);
1197
1198         return ret;
1199 }
1200
1201 /* enable transmitter and send remaining buffered characters
1202  */
1203 static void flush_chars(struct tty_struct *tty)
1204 {
1205         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1206         unsigned long flags;
1207
1208         if ( debug_level >= DEBUG_LEVEL_INFO )
1209                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1210                         __FILE__,__LINE__,info->device_name,info->tx_count);
1211
1212         if (sanity_check(info, tty->name, "flush_chars"))
1213                 return;
1214
1215         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1216             !info->tx_buf)
1217                 return;
1218
1219         if ( debug_level >= DEBUG_LEVEL_INFO )
1220                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1221                         __FILE__,__LINE__,info->device_name );
1222
1223         spin_lock_irqsave(&info->lock,flags);
1224
1225         if (!info->tx_active) {
1226                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1227                         info->tx_count ) {
1228                         /* operating in synchronous (frame oriented) mode */
1229                         /* copy data from circular tx_buf to */
1230                         /* transmit DMA buffer. */
1231                         tx_load_dma_buffer(info,
1232                                  info->tx_buf,info->tx_count);
1233                 }
1234                 tx_start(info);
1235         }
1236
1237         spin_unlock_irqrestore(&info->lock,flags);
1238 }
1239
1240 /* Discard all data in the send buffer
1241  */
1242 static void flush_buffer(struct tty_struct *tty)
1243 {
1244         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1245         unsigned long flags;
1246
1247         if (debug_level >= DEBUG_LEVEL_INFO)
1248                 printk("%s(%d):%s flush_buffer() entry\n",
1249                          __FILE__,__LINE__, info->device_name );
1250
1251         if (sanity_check(info, tty->name, "flush_buffer"))
1252                 return;
1253
1254         spin_lock_irqsave(&info->lock,flags);
1255         info->tx_count = info->tx_put = info->tx_get = 0;
1256         del_timer(&info->tx_timer);
1257         spin_unlock_irqrestore(&info->lock,flags);
1258
1259         wake_up_interruptible(&tty->write_wait);
1260         tty_wakeup(tty);
1261 }
1262
1263 /* throttle (stop) transmitter
1264  */
1265 static void tx_hold(struct tty_struct *tty)
1266 {
1267         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1268         unsigned long flags;
1269
1270         if (sanity_check(info, tty->name, "tx_hold"))
1271                 return;
1272
1273         if ( debug_level >= DEBUG_LEVEL_INFO )
1274                 printk("%s(%d):%s tx_hold()\n",
1275                         __FILE__,__LINE__,info->device_name);
1276
1277         spin_lock_irqsave(&info->lock,flags);
1278         if (info->tx_enabled)
1279                 tx_stop(info);
1280         spin_unlock_irqrestore(&info->lock,flags);
1281 }
1282
1283 /* release (start) transmitter
1284  */
1285 static void tx_release(struct tty_struct *tty)
1286 {
1287         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1288         unsigned long flags;
1289
1290         if (sanity_check(info, tty->name, "tx_release"))
1291                 return;
1292
1293         if ( debug_level >= DEBUG_LEVEL_INFO )
1294                 printk("%s(%d):%s tx_release()\n",
1295                         __FILE__,__LINE__,info->device_name);
1296
1297         spin_lock_irqsave(&info->lock,flags);
1298         if (!info->tx_enabled)
1299                 tx_start(info);
1300         spin_unlock_irqrestore(&info->lock,flags);
1301 }
1302
1303 /* Service an IOCTL request
1304  *
1305  * Arguments:
1306  *
1307  *      tty     pointer to tty instance data
1308  *      file    pointer to associated file object for device
1309  *      cmd     IOCTL command code
1310  *      arg     command argument/context
1311  *
1312  * Return Value:        0 if success, otherwise error code
1313  */
1314 static int ioctl(struct tty_struct *tty, struct file *file,
1315                  unsigned int cmd, unsigned long arg)
1316 {
1317         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1318         int error;
1319         struct mgsl_icount cnow;        /* kernel counter temps */
1320         struct serial_icounter_struct __user *p_cuser;  /* user space */
1321         unsigned long flags;
1322         void __user *argp = (void __user *)arg;
1323
1324         if (debug_level >= DEBUG_LEVEL_INFO)
1325                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1326                         info->device_name, cmd );
1327
1328         if (sanity_check(info, tty->name, "ioctl"))
1329                 return -ENODEV;
1330
1331         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1332             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1333                 if (tty->flags & (1 << TTY_IO_ERROR))
1334                     return -EIO;
1335         }
1336
1337         switch (cmd) {
1338         case MGSL_IOCGPARAMS:
1339                 return get_params(info, argp);
1340         case MGSL_IOCSPARAMS:
1341                 return set_params(info, argp);
1342         case MGSL_IOCGTXIDLE:
1343                 return get_txidle(info, argp);
1344         case MGSL_IOCSTXIDLE:
1345                 return set_txidle(info, (int)arg);
1346         case MGSL_IOCTXENABLE:
1347                 return tx_enable(info, (int)arg);
1348         case MGSL_IOCRXENABLE:
1349                 return rx_enable(info, (int)arg);
1350         case MGSL_IOCTXABORT:
1351                 return tx_abort(info);
1352         case MGSL_IOCGSTATS:
1353                 return get_stats(info, argp);
1354         case MGSL_IOCWAITEVENT:
1355                 return wait_mgsl_event(info, argp);
1356         case MGSL_IOCLOOPTXDONE:
1357                 return 0; // TODO: Not supported, need to document
1358                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1359                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1360                  */
1361         case TIOCMIWAIT:
1362                 return modem_input_wait(info,(int)arg);
1363
1364                 /*
1365                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1366                  * Return: write counters to the user passed counter struct
1367                  * NB: both 1->0 and 0->1 transitions are counted except for
1368                  *     RI where only 0->1 is counted.
1369                  */
1370         case TIOCGICOUNT:
1371                 spin_lock_irqsave(&info->lock,flags);
1372                 cnow = info->icount;
1373                 spin_unlock_irqrestore(&info->lock,flags);
1374                 p_cuser = argp;
1375                 PUT_USER(error,cnow.cts, &p_cuser->cts);
1376                 if (error) return error;
1377                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
1378                 if (error) return error;
1379                 PUT_USER(error,cnow.rng, &p_cuser->rng);
1380                 if (error) return error;
1381                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
1382                 if (error) return error;
1383                 PUT_USER(error,cnow.rx, &p_cuser->rx);
1384                 if (error) return error;
1385                 PUT_USER(error,cnow.tx, &p_cuser->tx);
1386                 if (error) return error;
1387                 PUT_USER(error,cnow.frame, &p_cuser->frame);
1388                 if (error) return error;
1389                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
1390                 if (error) return error;
1391                 PUT_USER(error,cnow.parity, &p_cuser->parity);
1392                 if (error) return error;
1393                 PUT_USER(error,cnow.brk, &p_cuser->brk);
1394                 if (error) return error;
1395                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
1396                 if (error) return error;
1397                 return 0;
1398         default:
1399                 return -ENOIOCTLCMD;
1400         }
1401         return 0;
1402 }
1403
1404 /*
1405  * /proc fs routines....
1406  */
1407
1408 static inline int line_info(char *buf, SLMP_INFO *info)
1409 {
1410         char    stat_buf[30];
1411         int     ret;
1412         unsigned long flags;
1413
1414         ret = sprintf(buf, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1415                        "\tIRQ=%d MaxFrameSize=%u\n",
1416                 info->device_name,
1417                 info->phys_sca_base,
1418                 info->phys_memory_base,
1419                 info->phys_statctrl_base,
1420                 info->phys_lcr_base,
1421                 info->irq_level,
1422                 info->max_frame_size );
1423
1424         /* output current serial signal states */
1425         spin_lock_irqsave(&info->lock,flags);
1426         get_signals(info);
1427         spin_unlock_irqrestore(&info->lock,flags);
1428
1429         stat_buf[0] = 0;
1430         stat_buf[1] = 0;
1431         if (info->serial_signals & SerialSignal_RTS)
1432                 strcat(stat_buf, "|RTS");
1433         if (info->serial_signals & SerialSignal_CTS)
1434                 strcat(stat_buf, "|CTS");
1435         if (info->serial_signals & SerialSignal_DTR)
1436                 strcat(stat_buf, "|DTR");
1437         if (info->serial_signals & SerialSignal_DSR)
1438                 strcat(stat_buf, "|DSR");
1439         if (info->serial_signals & SerialSignal_DCD)
1440                 strcat(stat_buf, "|CD");
1441         if (info->serial_signals & SerialSignal_RI)
1442                 strcat(stat_buf, "|RI");
1443
1444         if (info->params.mode == MGSL_MODE_HDLC) {
1445                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1446                               info->icount.txok, info->icount.rxok);
1447                 if (info->icount.txunder)
1448                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1449                 if (info->icount.txabort)
1450                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1451                 if (info->icount.rxshort)
1452                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1453                 if (info->icount.rxlong)
1454                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1455                 if (info->icount.rxover)
1456                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1457                 if (info->icount.rxcrc)
1458                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc);
1459         } else {
1460                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1461                               info->icount.tx, info->icount.rx);
1462                 if (info->icount.frame)
1463                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1464                 if (info->icount.parity)
1465                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1466                 if (info->icount.brk)
1467                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1468                 if (info->icount.overrun)
1469                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1470         }
1471
1472         /* Append serial signal status to end */
1473         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1474
1475         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1476          info->tx_active,info->bh_requested,info->bh_running,
1477          info->pending_bh);
1478
1479         return ret;
1480 }
1481
1482 /* Called to print information about devices
1483  */
1484 int read_proc(char *page, char **start, off_t off, int count,
1485               int *eof, void *data)
1486 {
1487         int len = 0, l;
1488         off_t   begin = 0;
1489         SLMP_INFO *info;
1490
1491         len += sprintf(page, "synclinkmp driver:%s\n", driver_version);
1492
1493         info = synclinkmp_device_list;
1494         while( info ) {
1495                 l = line_info(page + len, info);
1496                 len += l;
1497                 if (len+begin > off+count)
1498                         goto done;
1499                 if (len+begin < off) {
1500                         begin += len;
1501                         len = 0;
1502                 }
1503                 info = info->next_device;
1504         }
1505
1506         *eof = 1;
1507 done:
1508         if (off >= len+begin)
1509                 return 0;
1510         *start = page + (off-begin);
1511         return ((count < begin+len-off) ? count : begin+len-off);
1512 }
1513
1514 /* Return the count of bytes in transmit buffer
1515  */
1516 static int chars_in_buffer(struct tty_struct *tty)
1517 {
1518         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1519
1520         if (sanity_check(info, tty->name, "chars_in_buffer"))
1521                 return 0;
1522
1523         if (debug_level >= DEBUG_LEVEL_INFO)
1524                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1525                        __FILE__, __LINE__, info->device_name, info->tx_count);
1526
1527         return info->tx_count;
1528 }
1529
1530 /* Signal remote device to throttle send data (our receive data)
1531  */
1532 static void throttle(struct tty_struct * tty)
1533 {
1534         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1535         unsigned long flags;
1536
1537         if (debug_level >= DEBUG_LEVEL_INFO)
1538                 printk("%s(%d):%s throttle() entry\n",
1539                          __FILE__,__LINE__, info->device_name );
1540
1541         if (sanity_check(info, tty->name, "throttle"))
1542                 return;
1543
1544         if (I_IXOFF(tty))
1545                 send_xchar(tty, STOP_CHAR(tty));
1546
1547         if (tty->termios->c_cflag & CRTSCTS) {
1548                 spin_lock_irqsave(&info->lock,flags);
1549                 info->serial_signals &= ~SerialSignal_RTS;
1550                 set_signals(info);
1551                 spin_unlock_irqrestore(&info->lock,flags);
1552         }
1553 }
1554
1555 /* Signal remote device to stop throttling send data (our receive data)
1556  */
1557 static void unthrottle(struct tty_struct * tty)
1558 {
1559         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1560         unsigned long flags;
1561
1562         if (debug_level >= DEBUG_LEVEL_INFO)
1563                 printk("%s(%d):%s unthrottle() entry\n",
1564                          __FILE__,__LINE__, info->device_name );
1565
1566         if (sanity_check(info, tty->name, "unthrottle"))
1567                 return;
1568
1569         if (I_IXOFF(tty)) {
1570                 if (info->x_char)
1571                         info->x_char = 0;
1572                 else
1573                         send_xchar(tty, START_CHAR(tty));
1574         }
1575
1576         if (tty->termios->c_cflag & CRTSCTS) {
1577                 spin_lock_irqsave(&info->lock,flags);
1578                 info->serial_signals |= SerialSignal_RTS;
1579                 set_signals(info);
1580                 spin_unlock_irqrestore(&info->lock,flags);
1581         }
1582 }
1583
1584 /* set or clear transmit break condition
1585  * break_state  -1=set break condition, 0=clear
1586  */
1587 static void set_break(struct tty_struct *tty, int break_state)
1588 {
1589         unsigned char RegValue;
1590         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1591         unsigned long flags;
1592
1593         if (debug_level >= DEBUG_LEVEL_INFO)
1594                 printk("%s(%d):%s set_break(%d)\n",
1595                          __FILE__,__LINE__, info->device_name, break_state);
1596
1597         if (sanity_check(info, tty->name, "set_break"))
1598                 return;
1599
1600         spin_lock_irqsave(&info->lock,flags);
1601         RegValue = read_reg(info, CTL);
1602         if (break_state == -1)
1603                 RegValue |= BIT3;
1604         else
1605                 RegValue &= ~BIT3;
1606         write_reg(info, CTL, RegValue);
1607         spin_unlock_irqrestore(&info->lock,flags);
1608 }
1609
1610 #ifdef CONFIG_HDLC
1611
1612 /**
1613  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1614  * set encoding and frame check sequence (FCS) options
1615  *
1616  * dev       pointer to network device structure
1617  * encoding  serial encoding setting
1618  * parity    FCS setting
1619  *
1620  * returns 0 if success, otherwise error code
1621  */
1622 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1623                           unsigned short parity)
1624 {
1625         SLMP_INFO *info = dev_to_port(dev);
1626         unsigned char  new_encoding;
1627         unsigned short new_crctype;
1628
1629         /* return error if TTY interface open */
1630         if (info->count)
1631                 return -EBUSY;
1632
1633         switch (encoding)
1634         {
1635         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1636         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1637         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1638         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1639         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1640         default: return -EINVAL;
1641         }
1642
1643         switch (parity)
1644         {
1645         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1646         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1647         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1648         default: return -EINVAL;
1649         }
1650
1651         info->params.encoding = new_encoding;
1652         info->params.crc_type = new_crctype;
1653
1654         /* if network interface up, reprogram hardware */
1655         if (info->netcount)
1656                 program_hw(info);
1657
1658         return 0;
1659 }
1660
1661 /**
1662  * called by generic HDLC layer to send frame
1663  *
1664  * skb  socket buffer containing HDLC frame
1665  * dev  pointer to network device structure
1666  *
1667  * returns 0 if success, otherwise error code
1668  */
1669 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1670 {
1671         SLMP_INFO *info = dev_to_port(dev);
1672         struct net_device_stats *stats = hdlc_stats(dev);
1673         unsigned long flags;
1674
1675         if (debug_level >= DEBUG_LEVEL_INFO)
1676                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1677
1678         /* stop sending until this frame completes */
1679         netif_stop_queue(dev);
1680
1681         /* copy data to device buffers */
1682         info->tx_count = skb->len;
1683         tx_load_dma_buffer(info, skb->data, skb->len);
1684
1685         /* update network statistics */
1686         stats->tx_packets++;
1687         stats->tx_bytes += skb->len;
1688
1689         /* done with socket buffer, so free it */
1690         dev_kfree_skb(skb);
1691
1692         /* save start time for transmit timeout detection */
1693         dev->trans_start = jiffies;
1694
1695         /* start hardware transmitter if necessary */
1696         spin_lock_irqsave(&info->lock,flags);
1697         if (!info->tx_active)
1698                 tx_start(info);
1699         spin_unlock_irqrestore(&info->lock,flags);
1700
1701         return 0;
1702 }
1703
1704 /**
1705  * called by network layer when interface enabled
1706  * claim resources and initialize hardware
1707  *
1708  * dev  pointer to network device structure
1709  *
1710  * returns 0 if success, otherwise error code
1711  */
1712 static int hdlcdev_open(struct net_device *dev)
1713 {
1714         SLMP_INFO *info = dev_to_port(dev);
1715         int rc;
1716         unsigned long flags;
1717
1718         if (debug_level >= DEBUG_LEVEL_INFO)
1719                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1720
1721         /* generic HDLC layer open processing */
1722         if ((rc = hdlc_open(dev)))
1723                 return rc;
1724
1725         /* arbitrate between network and tty opens */
1726         spin_lock_irqsave(&info->netlock, flags);
1727         if (info->count != 0 || info->netcount != 0) {
1728                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1729                 spin_unlock_irqrestore(&info->netlock, flags);
1730                 return -EBUSY;
1731         }
1732         info->netcount=1;
1733         spin_unlock_irqrestore(&info->netlock, flags);
1734
1735         /* claim resources and init adapter */
1736         if ((rc = startup(info)) != 0) {
1737                 spin_lock_irqsave(&info->netlock, flags);
1738                 info->netcount=0;
1739                 spin_unlock_irqrestore(&info->netlock, flags);
1740                 return rc;
1741         }
1742
1743         /* assert DTR and RTS, apply hardware settings */
1744         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1745         program_hw(info);
1746
1747         /* enable network layer transmit */
1748         dev->trans_start = jiffies;
1749         netif_start_queue(dev);
1750
1751         /* inform generic HDLC layer of current DCD status */
1752         spin_lock_irqsave(&info->lock, flags);
1753         get_signals(info);
1754         spin_unlock_irqrestore(&info->lock, flags);
1755         if (info->serial_signals & SerialSignal_DCD)
1756                 netif_carrier_on(dev);
1757         else
1758                 netif_carrier_off(dev);
1759         return 0;
1760 }
1761
1762 /**
1763  * called by network layer when interface is disabled
1764  * shutdown hardware and release resources
1765  *
1766  * dev  pointer to network device structure
1767  *
1768  * returns 0 if success, otherwise error code
1769  */
1770 static int hdlcdev_close(struct net_device *dev)
1771 {
1772         SLMP_INFO *info = dev_to_port(dev);
1773         unsigned long flags;
1774
1775         if (debug_level >= DEBUG_LEVEL_INFO)
1776                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1777
1778         netif_stop_queue(dev);
1779
1780         /* shutdown adapter and release resources */
1781         shutdown(info);
1782
1783         hdlc_close(dev);
1784
1785         spin_lock_irqsave(&info->netlock, flags);
1786         info->netcount=0;
1787         spin_unlock_irqrestore(&info->netlock, flags);
1788
1789         return 0;
1790 }
1791
1792 /**
1793  * called by network layer to process IOCTL call to network device
1794  *
1795  * dev  pointer to network device structure
1796  * ifr  pointer to network interface request structure
1797  * cmd  IOCTL command code
1798  *
1799  * returns 0 if success, otherwise error code
1800  */
1801 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1802 {
1803         const size_t size = sizeof(sync_serial_settings);
1804         sync_serial_settings new_line;
1805         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1806         SLMP_INFO *info = dev_to_port(dev);
1807         unsigned int flags;
1808
1809         if (debug_level >= DEBUG_LEVEL_INFO)
1810                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1811
1812         /* return error if TTY interface open */
1813         if (info->count)
1814                 return -EBUSY;
1815
1816         if (cmd != SIOCWANDEV)
1817                 return hdlc_ioctl(dev, ifr, cmd);
1818
1819         switch(ifr->ifr_settings.type) {
1820         case IF_GET_IFACE: /* return current sync_serial_settings */
1821
1822                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1823                 if (ifr->ifr_settings.size < size) {
1824                         ifr->ifr_settings.size = size; /* data size wanted */
1825                         return -ENOBUFS;
1826                 }
1827
1828                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1829                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1830                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1831                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1832
1833                 switch (flags){
1834                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1835                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1836                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1837                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1838                 default: new_line.clock_type = CLOCK_DEFAULT;
1839                 }
1840
1841                 new_line.clock_rate = info->params.clock_speed;
1842                 new_line.loopback   = info->params.loopback ? 1:0;
1843
1844                 if (copy_to_user(line, &new_line, size))
1845                         return -EFAULT;
1846                 return 0;
1847
1848         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1849
1850                 if(!capable(CAP_NET_ADMIN))
1851                         return -EPERM;
1852                 if (copy_from_user(&new_line, line, size))
1853                         return -EFAULT;
1854
1855                 switch (new_line.clock_type)
1856                 {
1857                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1858                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1859                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1860                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1861                 case CLOCK_DEFAULT:  flags = info->params.flags &
1862                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1863                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1864                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1865                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1866                 default: return -EINVAL;
1867                 }
1868
1869                 if (new_line.loopback != 0 && new_line.loopback != 1)
1870                         return -EINVAL;
1871
1872                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1873                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1874                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1875                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1876                 info->params.flags |= flags;
1877
1878                 info->params.loopback = new_line.loopback;
1879
1880                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1881                         info->params.clock_speed = new_line.clock_rate;
1882                 else
1883                         info->params.clock_speed = 0;
1884
1885                 /* if network interface up, reprogram hardware */
1886                 if (info->netcount)
1887                         program_hw(info);
1888                 return 0;
1889
1890         default:
1891                 return hdlc_ioctl(dev, ifr, cmd);
1892         }
1893 }
1894
1895 /**
1896  * called by network layer when transmit timeout is detected
1897  *
1898  * dev  pointer to network device structure
1899  */
1900 static void hdlcdev_tx_timeout(struct net_device *dev)
1901 {
1902         SLMP_INFO *info = dev_to_port(dev);
1903         struct net_device_stats *stats = hdlc_stats(dev);
1904         unsigned long flags;
1905
1906         if (debug_level >= DEBUG_LEVEL_INFO)
1907                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1908
1909         stats->tx_errors++;
1910         stats->tx_aborted_errors++;
1911
1912         spin_lock_irqsave(&info->lock,flags);
1913         tx_stop(info);
1914         spin_unlock_irqrestore(&info->lock,flags);
1915
1916         netif_wake_queue(dev);
1917 }
1918
1919 /**
1920  * called by device driver when transmit completes
1921  * reenable network layer transmit if stopped
1922  *
1923  * info  pointer to device instance information
1924  */
1925 static void hdlcdev_tx_done(SLMP_INFO *info)
1926 {
1927         if (netif_queue_stopped(info->netdev))
1928                 netif_wake_queue(info->netdev);
1929 }
1930
1931 /**
1932  * called by device driver when frame received
1933  * pass frame to network layer
1934  *
1935  * info  pointer to device instance information
1936  * buf   pointer to buffer contianing frame data
1937  * size  count of data bytes in buf
1938  */
1939 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1940 {
1941         struct sk_buff *skb = dev_alloc_skb(size);
1942         struct net_device *dev = info->netdev;
1943         struct net_device_stats *stats = hdlc_stats(dev);
1944
1945         if (debug_level >= DEBUG_LEVEL_INFO)
1946                 printk("hdlcdev_rx(%s)\n",dev->name);
1947
1948         if (skb == NULL) {
1949                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
1950                 stats->rx_dropped++;
1951                 return;
1952         }
1953
1954         memcpy(skb_put(skb, size),buf,size);
1955
1956         skb->protocol = hdlc_type_trans(skb, info->netdev);
1957
1958         stats->rx_packets++;
1959         stats->rx_bytes += size;
1960
1961         netif_rx(skb);
1962
1963         info->netdev->last_rx = jiffies;
1964 }
1965
1966 /**
1967  * called by device driver when adding device instance
1968  * do generic HDLC initialization
1969  *
1970  * info  pointer to device instance information
1971  *
1972  * returns 0 if success, otherwise error code
1973  */
1974 static int hdlcdev_init(SLMP_INFO *info)
1975 {
1976         int rc;
1977         struct net_device *dev;
1978         hdlc_device *hdlc;
1979
1980         /* allocate and initialize network and HDLC layer objects */
1981
1982         if (!(dev = alloc_hdlcdev(info))) {
1983                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1984                 return -ENOMEM;
1985         }
1986
1987         /* for network layer reporting purposes only */
1988         dev->mem_start = info->phys_sca_base;
1989         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1990         dev->irq       = info->irq_level;
1991
1992         /* network layer callbacks and settings */
1993         dev->do_ioctl       = hdlcdev_ioctl;
1994         dev->open           = hdlcdev_open;
1995         dev->stop           = hdlcdev_close;
1996         dev->tx_timeout     = hdlcdev_tx_timeout;
1997         dev->watchdog_timeo = 10*HZ;
1998         dev->tx_queue_len   = 50;
1999
2000         /* generic HDLC layer callbacks and settings */
2001         hdlc         = dev_to_hdlc(dev);
2002         hdlc->attach = hdlcdev_attach;
2003         hdlc->xmit   = hdlcdev_xmit;
2004
2005         /* register objects with HDLC layer */
2006         if ((rc = register_hdlc_device(dev))) {
2007                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
2008                 free_netdev(dev);
2009                 return rc;
2010         }
2011
2012         info->netdev = dev;
2013         return 0;
2014 }
2015
2016 /**
2017  * called by device driver when removing device instance
2018  * do generic HDLC cleanup
2019  *
2020  * info  pointer to device instance information
2021  */
2022 static void hdlcdev_exit(SLMP_INFO *info)
2023 {
2024         unregister_hdlc_device(info->netdev);
2025         free_netdev(info->netdev);
2026         info->netdev = NULL;
2027 }
2028
2029 #endif /* CONFIG_HDLC */
2030
2031
2032 /* Return next bottom half action to perform.
2033  * Return Value:        BH action code or 0 if nothing to do.
2034  */
2035 int bh_action(SLMP_INFO *info)
2036 {
2037         unsigned long flags;
2038         int rc = 0;
2039
2040         spin_lock_irqsave(&info->lock,flags);
2041
2042         if (info->pending_bh & BH_RECEIVE) {
2043                 info->pending_bh &= ~BH_RECEIVE;
2044                 rc = BH_RECEIVE;
2045         } else if (info->pending_bh & BH_TRANSMIT) {
2046                 info->pending_bh &= ~BH_TRANSMIT;
2047                 rc = BH_TRANSMIT;
2048         } else if (info->pending_bh & BH_STATUS) {
2049                 info->pending_bh &= ~BH_STATUS;
2050                 rc = BH_STATUS;
2051         }
2052
2053         if (!rc) {
2054                 /* Mark BH routine as complete */
2055                 info->bh_running   = 0;
2056                 info->bh_requested = 0;
2057         }
2058
2059         spin_unlock_irqrestore(&info->lock,flags);
2060
2061         return rc;
2062 }
2063
2064 /* Perform bottom half processing of work items queued by ISR.
2065  */
2066 void bh_handler(void* Context)
2067 {
2068         SLMP_INFO *info = (SLMP_INFO*)Context;
2069         int action;
2070
2071         if (!info)
2072                 return;
2073
2074         if ( debug_level >= DEBUG_LEVEL_BH )
2075                 printk( "%s(%d):%s bh_handler() entry\n",
2076                         __FILE__,__LINE__,info->device_name);
2077
2078         info->bh_running = 1;
2079
2080         while((action = bh_action(info)) != 0) {
2081
2082                 /* Process work item */
2083                 if ( debug_level >= DEBUG_LEVEL_BH )
2084                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2085                                 __FILE__,__LINE__,info->device_name, action);
2086
2087                 switch (action) {
2088
2089                 case BH_RECEIVE:
2090                         bh_receive(info);
2091                         break;
2092                 case BH_TRANSMIT:
2093                         bh_transmit(info);
2094                         break;
2095                 case BH_STATUS:
2096                         bh_status(info);
2097                         break;
2098                 default:
2099                         /* unknown work item ID */
2100                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2101                                 __FILE__,__LINE__,info->device_name,action);
2102                         break;
2103                 }
2104         }
2105
2106         if ( debug_level >= DEBUG_LEVEL_BH )
2107                 printk( "%s(%d):%s bh_handler() exit\n",
2108                         __FILE__,__LINE__,info->device_name);
2109 }
2110
2111 void bh_receive(SLMP_INFO *info)
2112 {
2113         if ( debug_level >= DEBUG_LEVEL_BH )
2114                 printk( "%s(%d):%s bh_receive()\n",
2115                         __FILE__,__LINE__,info->device_name);
2116
2117         while( rx_get_frame(info) );
2118 }
2119
2120 void bh_transmit(SLMP_INFO *info)
2121 {
2122         struct tty_struct *tty = info->tty;
2123
2124         if ( debug_level >= DEBUG_LEVEL_BH )
2125                 printk( "%s(%d):%s bh_transmit() entry\n",
2126                         __FILE__,__LINE__,info->device_name);
2127
2128         if (tty) {
2129                 tty_wakeup(tty);
2130                 wake_up_interruptible(&tty->write_wait);
2131         }
2132 }
2133
2134 void bh_status(SLMP_INFO *info)
2135 {
2136         if ( debug_level >= DEBUG_LEVEL_BH )
2137                 printk( "%s(%d):%s bh_status() entry\n",
2138                         __FILE__,__LINE__,info->device_name);
2139
2140         info->ri_chkcount = 0;
2141         info->dsr_chkcount = 0;
2142         info->dcd_chkcount = 0;
2143         info->cts_chkcount = 0;
2144 }
2145
2146 void isr_timer(SLMP_INFO * info)
2147 {
2148         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2149
2150         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2151         write_reg(info, IER2, 0);
2152
2153         /* TMCS, Timer Control/Status Register
2154          *
2155          * 07      CMF, Compare match flag (read only) 1=match
2156          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2157          * 05      Reserved, must be 0
2158          * 04      TME, Timer Enable
2159          * 03..00  Reserved, must be 0
2160          *
2161          * 0000 0000
2162          */
2163         write_reg(info, (unsigned char)(timer + TMCS), 0);
2164
2165         info->irq_occurred = TRUE;
2166
2167         if ( debug_level >= DEBUG_LEVEL_ISR )
2168                 printk("%s(%d):%s isr_timer()\n",
2169                         __FILE__,__LINE__,info->device_name);
2170 }
2171
2172 void isr_rxint(SLMP_INFO * info)
2173 {
2174         struct tty_struct *tty = info->tty;
2175         struct  mgsl_icount *icount = &info->icount;
2176         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2177         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2178
2179         /* clear status bits */
2180         if (status)
2181                 write_reg(info, SR1, status);
2182
2183         if (status2)
2184                 write_reg(info, SR2, status2);
2185
2186         if ( debug_level >= DEBUG_LEVEL_ISR )
2187                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2188                         __FILE__,__LINE__,info->device_name,status,status2);
2189
2190         if (info->params.mode == MGSL_MODE_ASYNC) {
2191                 if (status & BRKD) {
2192                         icount->brk++;
2193
2194                         /* process break detection if tty control
2195                          * is not set to ignore it
2196                          */
2197                         if ( tty ) {
2198                                 if (!(status & info->ignore_status_mask1)) {
2199                                         if (info->read_status_mask1 & BRKD) {
2200                                                 tty_insert_flip_char(tty, 0, TTY_BREAK);
2201                                                 if (info->flags & ASYNC_SAK)
2202                                                         do_SAK(tty);
2203                                         }
2204                                 }
2205                         }
2206                 }
2207         }
2208         else {
2209                 if (status & (FLGD|IDLD)) {
2210                         if (status & FLGD)
2211                                 info->icount.exithunt++;
2212                         else if (status & IDLD)
2213                                 info->icount.rxidle++;
2214                         wake_up_interruptible(&info->event_wait_q);
2215                 }
2216         }
2217
2218         if (status & CDCD) {
2219                 /* simulate a common modem status change interrupt
2220                  * for our handler
2221                  */
2222                 get_signals( info );
2223                 isr_io_pin(info,
2224                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2225         }
2226 }
2227
2228 /*
2229  * handle async rx data interrupts
2230  */
2231 void isr_rxrdy(SLMP_INFO * info)
2232 {
2233         u16 status;
2234         unsigned char DataByte;
2235         struct tty_struct *tty = info->tty;
2236         struct  mgsl_icount *icount = &info->icount;
2237
2238         if ( debug_level >= DEBUG_LEVEL_ISR )
2239                 printk("%s(%d):%s isr_rxrdy\n",
2240                         __FILE__,__LINE__,info->device_name);
2241
2242         while((status = read_reg(info,CST0)) & BIT0)
2243         {
2244                 int flag = 0;
2245                 int over = 0;
2246                 DataByte = read_reg(info,TRB);
2247
2248                 icount->rx++;
2249
2250                 if ( status & (PE + FRME + OVRN) ) {
2251                         printk("%s(%d):%s rxerr=%04X\n",
2252                                 __FILE__,__LINE__,info->device_name,status);
2253
2254                         /* update error statistics */
2255                         if (status & PE)
2256                                 icount->parity++;
2257                         else if (status & FRME)
2258                                 icount->frame++;
2259                         else if (status & OVRN)
2260                                 icount->overrun++;
2261
2262                         /* discard char if tty control flags say so */
2263                         if (status & info->ignore_status_mask2)
2264                                 continue;
2265
2266                         status &= info->read_status_mask2;
2267
2268                         if ( tty ) {
2269                                 if (status & PE)
2270                                         flag = TTY_PARITY;
2271                                 else if (status & FRME)
2272                                         flag = TTY_FRAME;
2273                                 if (status & OVRN) {
2274                                         /* Overrun is special, since it's
2275                                          * reported immediately, and doesn't
2276                                          * affect the current character
2277                                          */
2278                                         over = 1;
2279                                 }
2280                         }
2281                 }       /* end of if (error) */
2282
2283                 if ( tty ) {
2284                         tty_insert_flip_char(tty, DataByte, flag);
2285                         if (over)
2286                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2287                 }
2288         }
2289
2290         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2291                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2292                         __FILE__,__LINE__,info->device_name,
2293                         icount->rx,icount->brk,icount->parity,
2294                         icount->frame,icount->overrun);
2295         }
2296
2297         if ( tty )
2298                 tty_flip_buffer_push(tty);
2299 }
2300
2301 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2302 {
2303         if ( debug_level >= DEBUG_LEVEL_ISR )
2304                 printk("%s(%d):%s isr_txeom status=%02x\n",
2305                         __FILE__,__LINE__,info->device_name,status);
2306
2307         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2308         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2309         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2310
2311         if (status & UDRN) {
2312                 write_reg(info, CMD, TXRESET);
2313                 write_reg(info, CMD, TXENABLE);
2314         } else
2315                 write_reg(info, CMD, TXBUFCLR);
2316
2317         /* disable and clear tx interrupts */
2318         info->ie0_value &= ~TXRDYE;
2319         info->ie1_value &= ~(IDLE + UDRN);
2320         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2321         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2322
2323         if ( info->tx_active ) {
2324                 if (info->params.mode != MGSL_MODE_ASYNC) {
2325                         if (status & UDRN)
2326                                 info->icount.txunder++;
2327                         else if (status & IDLE)
2328                                 info->icount.txok++;
2329                 }
2330
2331                 info->tx_active = 0;
2332                 info->tx_count = info->tx_put = info->tx_get = 0;
2333
2334                 del_timer(&info->tx_timer);
2335
2336                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2337                         info->serial_signals &= ~SerialSignal_RTS;
2338                         info->drop_rts_on_tx_done = 0;
2339                         set_signals(info);
2340                 }
2341
2342 #ifdef CONFIG_HDLC
2343                 if (info->netcount)
2344                         hdlcdev_tx_done(info);
2345                 else
2346 #endif
2347                 {
2348                         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2349                                 tx_stop(info);
2350                                 return;
2351                         }
2352                         info->pending_bh |= BH_TRANSMIT;
2353                 }
2354         }
2355 }
2356
2357
2358 /*
2359  * handle tx status interrupts
2360  */
2361 void isr_txint(SLMP_INFO * info)
2362 {
2363         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2364
2365         /* clear status bits */
2366         write_reg(info, SR1, status);
2367
2368         if ( debug_level >= DEBUG_LEVEL_ISR )
2369                 printk("%s(%d):%s isr_txint status=%02x\n",
2370                         __FILE__,__LINE__,info->device_name,status);
2371
2372         if (status & (UDRN + IDLE))
2373                 isr_txeom(info, status);
2374
2375         if (status & CCTS) {
2376                 /* simulate a common modem status change interrupt
2377                  * for our handler
2378                  */
2379                 get_signals( info );
2380                 isr_io_pin(info,
2381                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2382
2383         }
2384 }
2385
2386 /*
2387  * handle async tx data interrupts
2388  */
2389 void isr_txrdy(SLMP_INFO * info)
2390 {
2391         if ( debug_level >= DEBUG_LEVEL_ISR )
2392                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2393                         __FILE__,__LINE__,info->device_name,info->tx_count);
2394
2395         if (info->params.mode != MGSL_MODE_ASYNC) {
2396                 /* disable TXRDY IRQ, enable IDLE IRQ */
2397                 info->ie0_value &= ~TXRDYE;
2398                 info->ie1_value |= IDLE;
2399                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2400                 return;
2401         }
2402
2403         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2404                 tx_stop(info);
2405                 return;
2406         }
2407
2408         if ( info->tx_count )
2409                 tx_load_fifo( info );
2410         else {
2411                 info->tx_active = 0;
2412                 info->ie0_value &= ~TXRDYE;
2413                 write_reg(info, IE0, info->ie0_value);
2414         }
2415
2416         if (info->tx_count < WAKEUP_CHARS)
2417                 info->pending_bh |= BH_TRANSMIT;
2418 }
2419
2420 void isr_rxdmaok(SLMP_INFO * info)
2421 {
2422         /* BIT7 = EOT (end of transfer)
2423          * BIT6 = EOM (end of message/frame)
2424          */
2425         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2426
2427         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2428         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2429
2430         if ( debug_level >= DEBUG_LEVEL_ISR )
2431                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2432                         __FILE__,__LINE__,info->device_name,status);
2433
2434         info->pending_bh |= BH_RECEIVE;
2435 }
2436
2437 void isr_rxdmaerror(SLMP_INFO * info)
2438 {
2439         /* BIT5 = BOF (buffer overflow)
2440          * BIT4 = COF (counter overflow)
2441          */
2442         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2443
2444         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2445         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2446
2447         if ( debug_level >= DEBUG_LEVEL_ISR )
2448                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2449                         __FILE__,__LINE__,info->device_name,status);
2450
2451         info->rx_overflow = TRUE;
2452         info->pending_bh |= BH_RECEIVE;
2453 }
2454
2455 void isr_txdmaok(SLMP_INFO * info)
2456 {
2457         unsigned char status_reg1 = read_reg(info, SR1);
2458
2459         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2460         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2461         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2462
2463         if ( debug_level >= DEBUG_LEVEL_ISR )
2464                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2465                         __FILE__,__LINE__,info->device_name,status_reg1);
2466
2467         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2468         write_reg16(info, TRC0, 0);
2469         info->ie0_value |= TXRDYE;
2470         write_reg(info, IE0, info->ie0_value);
2471 }
2472
2473 void isr_txdmaerror(SLMP_INFO * info)
2474 {
2475         /* BIT5 = BOF (buffer overflow)
2476          * BIT4 = COF (counter overflow)
2477          */
2478         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2479
2480         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2481         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2482
2483         if ( debug_level >= DEBUG_LEVEL_ISR )
2484                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2485                         __FILE__,__LINE__,info->device_name,status);
2486 }
2487
2488 /* handle input serial signal changes
2489  */
2490 void isr_io_pin( SLMP_INFO *info, u16 status )
2491 {
2492         struct  mgsl_icount *icount;
2493
2494         if ( debug_level >= DEBUG_LEVEL_ISR )
2495                 printk("%s(%d):isr_io_pin status=%04X\n",
2496                         __FILE__,__LINE__,status);
2497
2498         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2499                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2500                 icount = &info->icount;
2501                 /* update input line counters */
2502                 if (status & MISCSTATUS_RI_LATCHED) {
2503                         icount->rng++;
2504                         if ( status & SerialSignal_RI )
2505                                 info->input_signal_events.ri_up++;
2506                         else
2507                                 info->input_signal_events.ri_down++;
2508                 }
2509                 if (status & MISCSTATUS_DSR_LATCHED) {
2510                         icount->dsr++;
2511                         if ( status & SerialSignal_DSR )
2512                                 info->input_signal_events.dsr_up++;
2513                         else
2514                                 info->input_signal_events.dsr_down++;
2515                 }
2516                 if (status & MISCSTATUS_DCD_LATCHED) {
2517                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2518                                 info->ie1_value &= ~CDCD;
2519                                 write_reg(info, IE1, info->ie1_value);
2520                         }
2521                         icount->dcd++;
2522                         if (status & SerialSignal_DCD) {
2523                                 info->input_signal_events.dcd_up++;
2524                         } else
2525                                 info->input_signal_events.dcd_down++;
2526 #ifdef CONFIG_HDLC
2527                         if (info->netcount) {
2528                                 if (status & SerialSignal_DCD)
2529                                         netif_carrier_on(info->netdev);
2530                                 else
2531                                         netif_carrier_off(info->netdev);
2532                         }
2533 #endif
2534                 }
2535                 if (status & MISCSTATUS_CTS_LATCHED)
2536                 {
2537                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2538                                 info->ie1_value &= ~CCTS;
2539                                 write_reg(info, IE1, info->ie1_value);
2540                         }
2541                         icount->cts++;
2542                         if ( status & SerialSignal_CTS )
2543                                 info->input_signal_events.cts_up++;
2544                         else
2545                                 info->input_signal_events.cts_down++;
2546                 }
2547                 wake_up_interruptible(&info->status_event_wait_q);
2548                 wake_up_interruptible(&info->event_wait_q);
2549
2550                 if ( (info->flags & ASYNC_CHECK_CD) &&
2551                      (status & MISCSTATUS_DCD_LATCHED) ) {
2552                         if ( debug_level >= DEBUG_LEVEL_ISR )
2553                                 printk("%s CD now %s...", info->device_name,
2554                                        (status & SerialSignal_DCD) ? "on" : "off");
2555                         if (status & SerialSignal_DCD)
2556                                 wake_up_interruptible(&info->open_wait);
2557                         else {
2558                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2559                                         printk("doing serial hangup...");
2560                                 if (info->tty)
2561                                         tty_hangup(info->tty);
2562                         }
2563                 }
2564
2565                 if ( (info->flags & ASYNC_CTS_FLOW) &&
2566                      (status & MISCSTATUS_CTS_LATCHED) ) {
2567                         if ( info->tty ) {
2568                                 if (info->tty->hw_stopped) {
2569                                         if (status & SerialSignal_CTS) {
2570                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2571                                                         printk("CTS tx start...");
2572                                                 info->tty->hw_stopped = 0;
2573                                                 tx_start(info);
2574                                                 info->pending_bh |= BH_TRANSMIT;
2575                                                 return;
2576                                         }
2577                                 } else {
2578                                         if (!(status & SerialSignal_CTS)) {
2579                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2580                                                         printk("CTS tx stop...");
2581                                                 info->tty->hw_stopped = 1;
2582                                                 tx_stop(info);
2583                                         }
2584                                 }
2585                         }
2586                 }
2587         }
2588
2589         info->pending_bh |= BH_STATUS;
2590 }
2591
2592 /* Interrupt service routine entry point.
2593  *
2594  * Arguments:
2595  *      irq             interrupt number that caused interrupt
2596  *      dev_id          device ID supplied during interrupt registration
2597  *      regs            interrupted processor context
2598  */
2599 static irqreturn_t synclinkmp_interrupt(int irq, void *dev_id,
2600                                         struct pt_regs *regs)
2601 {
2602         SLMP_INFO * info;
2603         unsigned char status, status0, status1=0;
2604         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2605         unsigned char timerstatus0, timerstatus1=0;
2606         unsigned char shift;
2607         unsigned int i;
2608         unsigned short tmp;
2609
2610         if ( debug_level >= DEBUG_LEVEL_ISR )
2611                 printk("%s(%d): synclinkmp_interrupt(%d)entry.\n",
2612                         __FILE__,__LINE__,irq);
2613
2614         info = (SLMP_INFO *)dev_id;
2615         if (!info)
2616                 return IRQ_NONE;
2617
2618         spin_lock(&info->lock);
2619
2620         for(;;) {
2621
2622                 /* get status for SCA0 (ports 0-1) */
2623                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2624                 status0 = (unsigned char)tmp;
2625                 dmastatus0 = (unsigned char)(tmp>>8);
2626                 timerstatus0 = read_reg(info, ISR2);
2627
2628                 if ( debug_level >= DEBUG_LEVEL_ISR )
2629                         printk("%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2630                                 __FILE__,__LINE__,info->device_name,
2631                                 status0,dmastatus0,timerstatus0);
2632
2633                 if (info->port_count == 4) {
2634                         /* get status for SCA1 (ports 2-3) */
2635                         tmp = read_reg16(info->port_array[2], ISR0);
2636                         status1 = (unsigned char)tmp;
2637                         dmastatus1 = (unsigned char)(tmp>>8);
2638                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2639
2640                         if ( debug_level >= DEBUG_LEVEL_ISR )
2641                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2642                                         __FILE__,__LINE__,info->device_name,
2643                                         status1,dmastatus1,timerstatus1);
2644                 }
2645
2646                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2647                          !status1 && !dmastatus1 && !timerstatus1)
2648                         break;
2649
2650                 for(i=0; i < info->port_count ; i++) {
2651                         if (info->port_array[i] == NULL)
2652                                 continue;
2653                         if (i < 2) {
2654                                 status = status0;
2655                                 dmastatus = dmastatus0;
2656                         } else {
2657                                 status = status1;
2658                                 dmastatus = dmastatus1;
2659                         }
2660
2661                         shift = i & 1 ? 4 :0;
2662
2663                         if (status & BIT0 << shift)
2664                                 isr_rxrdy(info->port_array[i]);
2665                         if (status & BIT1 << shift)
2666                                 isr_txrdy(info->port_array[i]);
2667                         if (status & BIT2 << shift)
2668                                 isr_rxint(info->port_array[i]);
2669                         if (status & BIT3 << shift)
2670                                 isr_txint(info->port_array[i]);
2671
2672                         if (dmastatus & BIT0 << shift)
2673                                 isr_rxdmaerror(info->port_array[i]);
2674                         if (dmastatus & BIT1 << shift)
2675                                 isr_rxdmaok(info->port_array[i]);
2676                         if (dmastatus & BIT2 << shift)
2677                                 isr_txdmaerror(info->port_array[i]);
2678                         if (dmastatus & BIT3 << shift)
2679                                 isr_txdmaok(info->port_array[i]);
2680                 }
2681
2682                 if (timerstatus0 & (BIT5 | BIT4))
2683                         isr_timer(info->port_array[0]);
2684                 if (timerstatus0 & (BIT7 | BIT6))
2685                         isr_timer(info->port_array[1]);
2686                 if (timerstatus1 & (BIT5 | BIT4))
2687                         isr_timer(info->port_array[2]);
2688                 if (timerstatus1 & (BIT7 | BIT6))
2689                         isr_timer(info->port_array[3]);
2690         }
2691
2692         for(i=0; i < info->port_count ; i++) {
2693                 SLMP_INFO * port = info->port_array[i];
2694
2695                 /* Request bottom half processing if there's something
2696                  * for it to do and the bh is not already running.
2697                  *
2698                  * Note: startup adapter diags require interrupts.
2699                  * do not request bottom half processing if the
2700                  * device is not open in a normal mode.
2701                  */
2702                 if ( port && (port->count || port->netcount) &&
2703                      port->pending_bh && !port->bh_running &&
2704                      !port->bh_requested ) {
2705                         if ( debug_level >= DEBUG_LEVEL_ISR )
2706                                 printk("%s(%d):%s queueing bh task.\n",
2707                                         __FILE__,__LINE__,port->device_name);
2708                         schedule_work(&port->task);
2709                         port->bh_requested = 1;
2710                 }
2711         }
2712
2713         spin_unlock(&info->lock);
2714
2715         if ( debug_level >= DEBUG_LEVEL_ISR )
2716                 printk("%s(%d):synclinkmp_interrupt(%d)exit.\n",
2717                         __FILE__,__LINE__,irq);
2718         return IRQ_HANDLED;
2719 }
2720
2721 /* Initialize and start device.
2722  */
2723 static int startup(SLMP_INFO * info)
2724 {
2725         if ( debug_level >= DEBUG_LEVEL_INFO )
2726                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2727
2728         if (info->flags & ASYNC_INITIALIZED)
2729                 return 0;
2730
2731         if (!info->tx_buf) {
2732                 info->tx_buf = (unsigned char *)kmalloc(info->max_frame_size, GFP_KERNEL);
2733                 if (!info->tx_buf) {
2734                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2735                                 __FILE__,__LINE__,info->device_name);
2736                         return -ENOMEM;
2737                 }
2738         }
2739
2740         info->pending_bh = 0;
2741
2742         memset(&info->icount, 0, sizeof(info->icount));
2743
2744         /* program hardware for current parameters */
2745         reset_port(info);
2746
2747         change_params(info);
2748
2749         info->status_timer.expires = jiffies + msecs_to_jiffies(10);
2750         add_timer(&info->status_timer);
2751
2752         if (info->tty)
2753                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2754
2755         info->flags |= ASYNC_INITIALIZED;
2756
2757         return 0;
2758 }
2759
2760 /* Called by close() and hangup() to shutdown hardware
2761  */
2762 static void shutdown(SLMP_INFO * info)
2763 {
2764         unsigned long flags;
2765
2766         if (!(info->flags & ASYNC_INITIALIZED))
2767                 return;
2768
2769         if (debug_level >= DEBUG_LEVEL_INFO)
2770                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2771                          __FILE__,__LINE__, info->device_name );
2772
2773         /* clear status wait queue because status changes */
2774         /* can't happen after shutting down the hardware */
2775         wake_up_interruptible(&info->status_event_wait_q);
2776         wake_up_interruptible(&info->event_wait_q);
2777
2778         del_timer(&info->tx_timer);
2779         del_timer(&info->status_timer);
2780
2781         kfree(info->tx_buf);
2782         info->tx_buf = NULL;
2783
2784         spin_lock_irqsave(&info->lock,flags);
2785
2786         reset_port(info);
2787
2788         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2789                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2790                 set_signals(info);
2791         }
2792
2793         spin_unlock_irqrestore(&info->lock,flags);
2794
2795         if (info->tty)
2796                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2797
2798         info->flags &= ~ASYNC_INITIALIZED;
2799 }
2800
2801 static void program_hw(SLMP_INFO *info)
2802 {
2803         unsigned long flags;
2804
2805         spin_lock_irqsave(&info->lock,flags);
2806
2807         rx_stop(info);
2808         tx_stop(info);
2809
2810         info->tx_count = info->tx_put = info->tx_get = 0;
2811
2812         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2813                 hdlc_mode(info);
2814         else
2815                 async_mode(info);
2816
2817         set_signals(info);
2818
2819         info->dcd_chkcount = 0;
2820         info->cts_chkcount = 0;
2821         info->ri_chkcount = 0;
2822         info->dsr_chkcount = 0;
2823
2824         info->ie1_value |= (CDCD|CCTS);
2825         write_reg(info, IE1, info->ie1_value);
2826
2827         get_signals(info);
2828
2829         if (info->netcount || (info->tty && info->tty->termios->c_cflag & CREAD) )
2830                 rx_start(info);
2831
2832         spin_unlock_irqrestore(&info->lock,flags);
2833 }
2834
2835 /* Reconfigure adapter based on new parameters
2836  */
2837 static void change_params(SLMP_INFO *info)
2838 {
2839         unsigned cflag;
2840         int bits_per_char;
2841
2842         if (!info->tty || !info->tty->termios)
2843                 return;
2844
2845         if (debug_level >= DEBUG_LEVEL_INFO)
2846                 printk("%s(%d):%s change_params()\n",
2847                          __FILE__,__LINE__, info->device_name );
2848
2849         cflag = info->tty->termios->c_cflag;
2850
2851         /* if B0 rate (hangup) specified then negate DTR and RTS */
2852         /* otherwise assert DTR and RTS */
2853         if (cflag & CBAUD)
2854                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2855         else
2856                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2857
2858         /* byte size and parity */
2859
2860         switch (cflag & CSIZE) {
2861               case CS5: info->params.data_bits = 5; break;
2862               case CS6: info->params.data_bits = 6; break;
2863               case CS7: info->params.data_bits = 7; break;
2864               case CS8: info->params.data_bits = 8; break;
2865               /* Never happens, but GCC is too dumb to figure it out */
2866               default:  info->params.data_bits = 7; break;
2867               }
2868
2869         if (cflag & CSTOPB)
2870                 info->params.stop_bits = 2;
2871         else
2872                 info->params.stop_bits = 1;
2873
2874         info->params.parity = ASYNC_PARITY_NONE;
2875         if (cflag & PARENB) {
2876                 if (cflag & PARODD)
2877                         info->params.parity = ASYNC_PARITY_ODD;
2878                 else
2879                         info->params.parity = ASYNC_PARITY_EVEN;
2880 #ifdef CMSPAR
2881                 if (cflag & CMSPAR)
2882                         info->params.parity = ASYNC_PARITY_SPACE;
2883 #endif
2884         }
2885
2886         /* calculate number of jiffies to transmit a full
2887          * FIFO (32 bytes) at specified data rate
2888          */
2889         bits_per_char = info->params.data_bits +
2890                         info->params.stop_bits + 1;
2891
2892         /* if port data rate is set to 460800 or less then
2893          * allow tty settings to override, otherwise keep the
2894          * current data rate.
2895          */
2896         if (info->params.data_rate <= 460800) {
2897                 info->params.data_rate = tty_get_baud_rate(info->tty);
2898         }
2899
2900         if ( info->params.data_rate ) {
2901                 info->timeout = (32*HZ*bits_per_char) /
2902                                 info->params.data_rate;
2903         }
2904         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2905
2906         if (cflag & CRTSCTS)
2907                 info->flags |= ASYNC_CTS_FLOW;
2908         else
2909                 info->flags &= ~ASYNC_CTS_FLOW;
2910
2911         if (cflag & CLOCAL)
2912                 info->flags &= ~ASYNC_CHECK_CD;
2913         else
2914                 info->flags |= ASYNC_CHECK_CD;
2915
2916         /* process tty input control flags */
2917
2918         info->read_status_mask2 = OVRN;
2919         if (I_INPCK(info->tty))
2920                 info->read_status_mask2 |= PE | FRME;
2921         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2922                 info->read_status_mask1 |= BRKD;
2923         if (I_IGNPAR(info->tty))
2924                 info->ignore_status_mask2 |= PE | FRME;
2925         if (I_IGNBRK(info->tty)) {
2926                 info->ignore_status_mask1 |= BRKD;
2927                 /* If ignoring parity and break indicators, ignore
2928                  * overruns too.  (For real raw support).
2929                  */
2930                 if (I_IGNPAR(info->tty))
2931                         info->ignore_status_mask2 |= OVRN;
2932         }
2933
2934         program_hw(info);
2935 }
2936
2937 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2938 {
2939         int err;
2940
2941         if (debug_level >= DEBUG_LEVEL_INFO)
2942                 printk("%s(%d):%s get_params()\n",
2943                          __FILE__,__LINE__, info->device_name);
2944
2945         if (!user_icount) {
2946                 memset(&info->icount, 0, sizeof(info->icount));
2947         } else {
2948                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2949                 if (err)
2950                         return -EFAULT;
2951         }
2952
2953         return 0;
2954 }
2955
2956 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2957 {
2958         int err;
2959         if (debug_level >= DEBUG_LEVEL_INFO)
2960                 printk("%s(%d):%s get_params()\n",
2961                          __FILE__,__LINE__, info->device_name);
2962
2963         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2964         if (err) {
2965                 if ( debug_level >= DEBUG_LEVEL_INFO )
2966                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2967                                 __FILE__,__LINE__,info->device_name);
2968                 return -EFAULT;
2969         }
2970
2971         return 0;
2972 }
2973
2974 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2975 {
2976         unsigned long flags;
2977         MGSL_PARAMS tmp_params;
2978         int err;
2979
2980         if (debug_level >= DEBUG_LEVEL_INFO)
2981                 printk("%s(%d):%s set_params\n",
2982                         __FILE__,__LINE__,info->device_name );
2983         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2984         if (err) {
2985                 if ( debug_level >= DEBUG_LEVEL_INFO )
2986                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2987                                 __FILE__,__LINE__,info->device_name);
2988                 return -EFAULT;
2989         }
2990
2991         spin_lock_irqsave(&info->lock,flags);
2992         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2993         spin_unlock_irqrestore(&info->lock,flags);
2994
2995         change_params(info);
2996
2997         return 0;
2998 }
2999
3000 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
3001 {
3002         int err;
3003
3004         if (debug_level >= DEBUG_LEVEL_INFO)
3005                 printk("%s(%d):%s get_txidle()=%d\n",
3006                          __FILE__,__LINE__, info->device_name, info->idle_mode);
3007
3008         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
3009         if (err) {
3010                 if ( debug_level >= DEBUG_LEVEL_INFO )
3011                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
3012                                 __FILE__,__LINE__,info->device_name);
3013                 return -EFAULT;
3014         }
3015
3016         return 0;
3017 }
3018
3019 static int set_txidle(SLMP_INFO * info, int idle_mode)
3020 {
3021         unsigned long flags;
3022
3023         if (debug_level >= DEBUG_LEVEL_INFO)
3024                 printk("%s(%d):%s set_txidle(%d)\n",
3025                         __FILE__,__LINE__,info->device_name, idle_mode );
3026
3027         spin_lock_irqsave(&info->lock,flags);
3028         info->idle_mode = idle_mode;
3029         tx_set_idle( info );
3030         spin_unlock_irqrestore(&info->lock,flags);
3031         return 0;
3032 }
3033
3034 static int tx_enable(SLMP_INFO * info, int enable)
3035 {
3036         unsigned long flags;
3037
3038         if (debug_level >= DEBUG_LEVEL_INFO)
3039                 printk("%s(%d):%s tx_enable(%d)\n",
3040                         __FILE__,__LINE__,info->device_name, enable);
3041
3042         spin_lock_irqsave(&info->lock,flags);
3043         if ( enable ) {
3044                 if ( !info->tx_enabled ) {
3045                         tx_start(info);
3046                 }
3047         } else {
3048                 if ( info->tx_enabled )
3049                         tx_stop(info);
3050         }
3051         spin_unlock_irqrestore(&info->lock,flags);
3052         return 0;
3053 }
3054
3055 /* abort send HDLC frame
3056  */
3057 static int tx_abort(SLMP_INFO * info)
3058 {
3059         unsigned long flags;
3060
3061         if (debug_level >= DEBUG_LEVEL_INFO)
3062                 printk("%s(%d):%s tx_abort()\n",
3063                         __FILE__,__LINE__,info->device_name);
3064
3065         spin_lock_irqsave(&info->lock,flags);
3066         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3067                 info->ie1_value &= ~UDRN;
3068                 info->ie1_value |= IDLE;
3069                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
3070                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
3071
3072                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
3073                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3074
3075                 write_reg(info, CMD, TXABORT);
3076         }
3077         spin_unlock_irqrestore(&info->lock,flags);
3078         return 0;
3079 }
3080
3081 static int rx_enable(SLMP_INFO * info, int enable)
3082 {
3083         unsigned long flags;
3084
3085         if (debug_level >= DEBUG_LEVEL_INFO)
3086                 printk("%s(%d):%s rx_enable(%d)\n",
3087                         __FILE__,__LINE__,info->device_name,enable);
3088
3089         spin_lock_irqsave(&info->lock,flags);
3090         if ( enable ) {
3091                 if ( !info->rx_enabled )
3092                         rx_start(info);
3093         } else {
3094                 if ( info->rx_enabled )
3095                         rx_stop(info);
3096         }
3097         spin_unlock_irqrestore(&info->lock,flags);
3098         return 0;
3099 }
3100
3101 /* wait for specified event to occur
3102  */
3103 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3104 {
3105         unsigned long flags;
3106         int s;
3107         int rc=0;
3108         struct mgsl_icount cprev, cnow;
3109         int events;
3110         int mask;
3111         struct  _input_signal_events oldsigs, newsigs;
3112         DECLARE_WAITQUEUE(wait, current);
3113
3114         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3115         if (rc) {
3116                 return  -EFAULT;
3117         }
3118
3119         if (debug_level >= DEBUG_LEVEL_INFO)
3120                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3121                         __FILE__,__LINE__,info->device_name,mask);
3122
3123         spin_lock_irqsave(&info->lock,flags);
3124
3125         /* return immediately if state matches requested events */
3126         get_signals(info);
3127         s = info->serial_signals;
3128
3129         events = mask &
3130                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3131                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3132                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3133                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3134         if (events) {
3135                 spin_unlock_irqrestore(&info->lock,flags);
3136                 goto exit;
3137         }
3138
3139         /* save current irq counts */
3140         cprev = info->icount;
3141         oldsigs = info->input_signal_events;
3142
3143         /* enable hunt and idle irqs if needed */
3144         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3145                 unsigned char oldval = info->ie1_value;
3146                 unsigned char newval = oldval +
3147                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3148                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3149                 if ( oldval != newval ) {
3150                         info->ie1_value = newval;
3151                         write_reg(info, IE1, info->ie1_value);
3152                 }
3153         }
3154
3155         set_current_state(TASK_INTERRUPTIBLE);
3156         add_wait_queue(&info->event_wait_q, &wait);
3157
3158         spin_unlock_irqrestore(&info->lock,flags);
3159
3160         for(;;) {
3161                 schedule();
3162                 if (signal_pending(current)) {
3163                         rc = -ERESTARTSYS;
3164                         break;
3165                 }
3166
3167                 /* get current irq counts */
3168                 spin_lock_irqsave(&info->lock,flags);
3169                 cnow = info->icount;
3170                 newsigs = info->input_signal_events;
3171                 set_current_state(TASK_INTERRUPTIBLE);
3172                 spin_unlock_irqrestore(&info->lock,flags);
3173
3174                 /* if no change, wait aborted for some reason */
3175                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3176                     newsigs.dsr_down == oldsigs.dsr_down &&
3177                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3178                     newsigs.dcd_down == oldsigs.dcd_down &&
3179                     newsigs.cts_up   == oldsigs.cts_up   &&
3180                     newsigs.cts_down == oldsigs.cts_down &&
3181                     newsigs.ri_up    == oldsigs.ri_up    &&
3182                     newsigs.ri_down  == oldsigs.ri_down  &&
3183                     cnow.exithunt    == cprev.exithunt   &&
3184                     cnow.rxidle      == cprev.rxidle) {
3185                         rc = -EIO;
3186                         break;
3187                 }
3188
3189                 events = mask &
3190                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3191                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3192                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3193                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3194                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3195                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3196                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3197                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3198                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3199                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3200                 if (events)
3201                         break;
3202
3203                 cprev = cnow;
3204                 oldsigs = newsigs;
3205         }
3206
3207         remove_wait_queue(&info->event_wait_q, &wait);
3208         set_current_state(TASK_RUNNING);
3209
3210
3211         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3212                 spin_lock_irqsave(&info->lock,flags);
3213                 if (!waitqueue_active(&info->event_wait_q)) {
3214                         /* disable enable exit hunt mode/idle rcvd IRQs */
3215                         info->ie1_value &= ~(FLGD|IDLD);
3216                         write_reg(info, IE1, info->ie1_value);
3217                 }
3218                 spin_unlock_irqrestore(&info->lock,flags);
3219         }
3220 exit:
3221         if ( rc == 0 )
3222                 PUT_USER(rc, events, mask_ptr);
3223
3224         return rc;
3225 }
3226
3227 static int modem_input_wait(SLMP_INFO *info,int arg)
3228 {
3229         unsigned long flags;
3230         int rc;
3231         struct mgsl_icount cprev, cnow;
3232         DECLARE_WAITQUEUE(wait, current);
3233
3234         /* save current irq counts */
3235         spin_lock_irqsave(&info->lock,flags);
3236         cprev = info->icount;
3237         add_wait_queue(&info->status_event_wait_q, &wait);
3238         set_current_state(TASK_INTERRUPTIBLE);
3239         spin_unlock_irqrestore(&info->lock,flags);
3240
3241         for(;;) {
3242                 schedule();
3243                 if (signal_pending(current)) {
3244                         rc = -ERESTARTSYS;
3245                         break;
3246                 }
3247
3248                 /* get new irq counts */
3249                 spin_lock_irqsave(&info->lock,flags);
3250                 cnow = info->icount;
3251                 set_current_state(TASK_INTERRUPTIBLE);
3252                 spin_unlock_irqrestore(&info->lock,flags);
3253
3254                 /* if no change, wait aborted for some reason */
3255                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3256                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3257                         rc = -EIO;
3258                         break;
3259                 }
3260
3261                 /* check for change in caller specified modem input */
3262                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3263                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3264                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3265                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3266                         rc = 0;
3267                         break;
3268                 }
3269
3270                 cprev = cnow;
3271         }
3272         remove_wait_queue(&info->status_event_wait_q, &wait);
3273         set_current_state(TASK_RUNNING);
3274         return rc;
3275 }
3276
3277 /* return the state of the serial control and status signals
3278  */
3279 static int tiocmget(struct tty_struct *tty, struct file *file)
3280 {
3281         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3282         unsigned int result;
3283         unsigned long flags;
3284
3285         spin_lock_irqsave(&info->lock,flags);
3286         get_signals(info);
3287         spin_unlock_irqrestore(&info->lock,flags);
3288
3289         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3290                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3291                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3292                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3293                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3294                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3295
3296         if (debug_level >= DEBUG_LEVEL_INFO)
3297                 printk("%s(%d):%s tiocmget() value=%08X\n",
3298                          __FILE__,__LINE__, info->device_name, result );
3299         return result;
3300 }
3301
3302 /* set modem control signals (DTR/RTS)
3303  */
3304 static int tiocmset(struct tty_struct *tty, struct file *file,
3305                     unsigned int set, unsigned int clear)
3306 {
3307         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3308         unsigned long flags;
3309
3310         if (debug_level >= DEBUG_LEVEL_INFO)
3311                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3312                         __FILE__,__LINE__,info->device_name, set, clear);
3313
3314         if (set & TIOCM_RTS)
3315                 info->serial_signals |= SerialSignal_RTS;
3316         if (set & TIOCM_DTR)
3317                 info->serial_signals |= SerialSignal_DTR;
3318         if (clear & TIOCM_RTS)
3319                 info->serial_signals &= ~SerialSignal_RTS;
3320         if (clear & TIOCM_DTR)
3321                 info->serial_signals &= ~SerialSignal_DTR;
3322
3323         spin_lock_irqsave(&info->lock,flags);
3324         set_signals(info);
3325         spin_unlock_irqrestore(&info->lock,flags);
3326
3327         return 0;
3328 }
3329
3330
3331
3332 /* Block the current process until the specified port is ready to open.
3333  */
3334 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3335                            SLMP_INFO *info)
3336 {
3337         DECLARE_WAITQUEUE(wait, current);
3338         int             retval;
3339         int             do_clocal = 0, extra_count = 0;
3340         unsigned long   flags;
3341
3342         if (debug_level >= DEBUG_LEVEL_INFO)
3343                 printk("%s(%d):%s block_til_ready()\n",
3344                          __FILE__,__LINE__, tty->driver->name );
3345
3346         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3347                 /* nonblock mode is set or port is not enabled */
3348                 /* just verify that callout device is not active */
3349                 info->flags |= ASYNC_NORMAL_ACTIVE;
3350                 return 0;
3351         }
3352
3353         if (tty->termios->c_cflag & CLOCAL)
3354                 do_clocal = 1;
3355
3356         /* Wait for carrier detect and the line to become
3357          * free (i.e., not in use by the callout).  While we are in
3358          * this loop, info->count is dropped by one, so that
3359          * close() knows when to free things.  We restore it upon
3360          * exit, either normal or abnormal.
3361          */
3362
3363         retval = 0;
3364         add_wait_queue(&info->open_wait, &wait);
3365
3366         if (debug_level >= DEBUG_LEVEL_INFO)
3367                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3368                          __FILE__,__LINE__, tty->driver->name, info->count );
3369
3370         spin_lock_irqsave(&info->lock, flags);
3371         if (!tty_hung_up_p(filp)) {
3372                 extra_count = 1;
3373                 info->count--;
3374         }
3375         spin_unlock_irqrestore(&info->lock, flags);
3376         info->blocked_open++;
3377
3378         while (1) {
3379                 if ((tty->termios->c_cflag & CBAUD)) {
3380                         spin_lock_irqsave(&info->lock,flags);
3381                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3382                         set_signals(info);
3383                         spin_unlock_irqrestore(&info->lock,flags);
3384                 }
3385
3386                 set_current_state(TASK_INTERRUPTIBLE);
3387
3388                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3389                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3390                                         -EAGAIN : -ERESTARTSYS;
3391                         break;
3392                 }
3393
3394                 spin_lock_irqsave(&info->lock,flags);
3395                 get_signals(info);
3396                 spin_unlock_irqrestore(&info->lock,flags);
3397
3398                 if (!(info->flags & ASYNC_CLOSING) &&
3399                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3400                         break;
3401                 }
3402
3403                 if (signal_pending(current)) {
3404                         retval = -ERESTARTSYS;
3405                         break;
3406                 }
3407
3408                 if (debug_level >= DEBUG_LEVEL_INFO)
3409                         printk("%s(%d):%s block_til_ready() count=%d\n",
3410                                  __FILE__,__LINE__, tty->driver->name, info->count );
3411
3412                 schedule();
3413         }
3414
3415         set_current_state(TASK_RUNNING);
3416         remove_wait_queue(&info->open_wait, &wait);
3417
3418         if (extra_count)
3419                 info->count++;
3420         info->blocked_open--;
3421
3422         if (debug_level >= DEBUG_LEVEL_INFO)
3423                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3424                          __FILE__,__LINE__, tty->driver->name, info->count );
3425
3426         if (!retval)
3427                 info->flags |= ASYNC_NORMAL_ACTIVE;
3428
3429         return retval;
3430 }
3431
3432 int alloc_dma_bufs(SLMP_INFO *info)
3433 {
3434         unsigned short BuffersPerFrame;
3435         unsigned short BufferCount;
3436
3437         // Force allocation to start at 64K boundary for each port.
3438         // This is necessary because *all* buffer descriptors for a port
3439         // *must* be in the same 64K block. All descriptors on a port
3440         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3441         // into the CBP register.
3442         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3443
3444         /* Calculate the number of DMA buffers necessary to hold the */
3445         /* largest allowable frame size. Note: If the max frame size is */
3446         /* not an even multiple of the DMA buffer size then we need to */
3447         /* round the buffer count per frame up one. */
3448
3449         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3450         if ( info->max_frame_size % SCABUFSIZE )
3451                 BuffersPerFrame++;
3452
3453         /* calculate total number of data buffers (SCABUFSIZE) possible
3454          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3455          * for the descriptor list (BUFFERLISTSIZE).
3456          */
3457         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3458
3459         /* limit number of buffers to maximum amount of descriptors */
3460         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3461                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3462
3463         /* use enough buffers to transmit one max size frame */
3464         info->tx_buf_count = BuffersPerFrame + 1;
3465
3466         /* never use more than half the available buffers for transmit */
3467         if (info->tx_buf_count > (BufferCount/2))
3468                 info->tx_buf_count = BufferCount/2;
3469
3470         if (info->tx_buf_count > SCAMAXDESC)
3471                 info->tx_buf_count = SCAMAXDESC;
3472
3473         /* use remaining buffers for receive */
3474         info->rx_buf_count = BufferCount - info->tx_buf_count;
3475
3476         if (info->rx_buf_count > SCAMAXDESC)
3477                 info->rx_buf_count = SCAMAXDESC;
3478
3479         if ( debug_level >= DEBUG_LEVEL_INFO )
3480                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3481                         __FILE__,__LINE__, info->device_name,
3482                         info->tx_buf_count,info->rx_buf_count);
3483
3484         if ( alloc_buf_list( info ) < 0 ||
3485                 alloc_frame_bufs(info,
3486                                         info->rx_buf_list,
3487                                         info->rx_buf_list_ex,
3488                                         info->rx_buf_count) < 0 ||
3489                 alloc_frame_bufs(info,
3490                                         info->tx_buf_list,
3491                                         info->tx_buf_list_ex,
3492                                         info->tx_buf_count) < 0 ||
3493                 alloc_tmp_rx_buf(info) < 0 ) {
3494                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3495                         __FILE__,__LINE__, info->device_name);
3496                 return -ENOMEM;
3497         }
3498
3499         rx_reset_buffers( info );
3500
3501         return 0;
3502 }
3503
3504 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3505  */
3506 int alloc_buf_list(SLMP_INFO *info)
3507 {
3508         unsigned int i;
3509
3510         /* build list in adapter shared memory */
3511         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3512         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3513         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3514
3515         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3516
3517         /* Save virtual address pointers to the receive and */
3518         /* transmit buffer lists. (Receive 1st). These pointers will */
3519         /* be used by the processor to access the lists. */
3520         info->rx_buf_list = (SCADESC *)info->buffer_list;
3521
3522         info->tx_buf_list = (SCADESC *)info->buffer_list;
3523         info->tx_buf_list += info->rx_buf_count;
3524
3525         /* Build links for circular buffer entry lists (tx and rx)
3526          *
3527          * Note: links are physical addresses read by the SCA device
3528          * to determine the next buffer entry to use.
3529          */
3530
3531         for ( i = 0; i < info->rx_buf_count; i++ ) {
3532                 /* calculate and store physical address of this buffer entry */
3533                 info->rx_buf_list_ex[i].phys_entry =
3534                         info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3535
3536                 /* calculate and store physical address of */
3537                 /* next entry in cirular list of entries */
3538                 info->rx_buf_list[i].next = info->buffer_list_phys;
3539                 if ( i < info->rx_buf_count - 1 )
3540                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3541
3542                 info->rx_buf_list[i].length = SCABUFSIZE;
3543         }
3544
3545         for ( i = 0; i < info->tx_buf_count; i++ ) {
3546                 /* calculate and store physical address of this buffer entry */
3547                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3548                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3549
3550                 /* calculate and store physical address of */
3551                 /* next entry in cirular list of entries */
3552
3553                 info->tx_buf_list[i].next = info->buffer_list_phys +
3554                         info->rx_buf_count * sizeof(SCADESC);
3555
3556                 if ( i < info->tx_buf_count - 1 )
3557                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3558         }
3559
3560         return 0;
3561 }
3562
3563 /* Allocate the frame DMA buffers used by the specified buffer list.
3564  */
3565 int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3566 {
3567         int i;
3568         unsigned long phys_addr;
3569
3570         for ( i = 0; i < count; i++ ) {
3571                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3572                 phys_addr = info->port_array[0]->last_mem_alloc;
3573                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3574
3575                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3576                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3577         }
3578
3579         return 0;
3580 }
3581
3582 void free_dma_bufs(SLMP_INFO *info)
3583 {
3584         info->buffer_list = NULL;
3585         info->rx_buf_list = NULL;
3586         info->tx_buf_list = NULL;
3587 }
3588
3589 /* allocate buffer large enough to hold max_frame_size.
3590  * This buffer is used to pass an assembled frame to the line discipline.
3591  */
3592 int alloc_tmp_rx_buf(SLMP_INFO *info)
3593 {
3594         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3595         if (info->tmp_rx_buf == NULL)
3596                 return -ENOMEM;
3597         return 0;
3598 }
3599
3600 void free_tmp_rx_buf(SLMP_INFO *info)
3601 {
3602         kfree(info->tmp_rx_buf);
3603         info->tmp_rx_buf = NULL;
3604 }
3605
3606 int claim_resources(SLMP_INFO *info)
3607 {
3608         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3609                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3610                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3611                 info->init_error = DiagStatus_AddressConflict;
3612                 goto errout;
3613         }
3614         else
3615                 info->shared_mem_requested = 1;
3616
3617         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3618                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3619                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3620                 info->init_error = DiagStatus_AddressConflict;
3621                 goto errout;
3622         }
3623         else
3624                 info->lcr_mem_requested = 1;
3625
3626         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3627                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3628                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3629                 info->init_error = DiagStatus_AddressConflict;
3630                 goto errout;
3631         }
3632         else
3633                 info->sca_base_requested = 1;
3634
3635         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3636                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3637                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3638                 info->init_error = DiagStatus_AddressConflict;
3639                 goto errout;
3640         }
3641         else
3642                 info->sca_statctrl_requested = 1;
3643
3644         info->memory_base = ioremap(info->phys_memory_base,SCA_MEM_SIZE);
3645         if (!info->memory_base) {
3646                 printk( "%s(%d):%s Cant map shared memory, MemAddr=%08X\n",
3647                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3648                 info->init_error = DiagStatus_CantAssignPciResources;
3649                 goto errout;
3650         }
3651
3652         info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE);
3653         if (!info->lcr_base) {
3654                 printk( "%s(%d):%s Cant map LCR memory, MemAddr=%08X\n",
3655                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3656                 info->init_error = DiagStatus_CantAssignPciResources;
3657                 goto errout;
3658         }
3659         info->lcr_base += info->lcr_offset;
3660
3661         info->sca_base = ioremap(info->phys_sca_base,PAGE_SIZE);
3662         if (!info->sca_base) {
3663                 printk( "%s(%d):%s Cant map SCA memory, MemAddr=%08X\n",
3664                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3665                 info->init_error = DiagStatus_CantAssignPciResources;
3666                 goto errout;
3667         }
3668         info->sca_base += info->sca_offset;
3669
3670         info->statctrl_base = ioremap(info->phys_statctrl_base,PAGE_SIZE);
3671         if (!info->statctrl_base) {
3672                 printk( "%s(%d):%s Cant map SCA Status/Control memory, MemAddr=%08X\n",
3673                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3674                 info->init_error = DiagStatus_CantAssignPciResources;
3675                 goto errout;
3676         }
3677         info->statctrl_base += info->statctrl_offset;
3678
3679         if ( !memory_test(info) ) {
3680                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3681                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3682                 info->init_error = DiagStatus_MemoryError;
3683                 goto errout;
3684         }
3685
3686         return 0;
3687
3688 errout:
3689         release_resources( info );
3690         return -ENODEV;
3691 }
3692
3693 void release_resources(SLMP_INFO *info)
3694 {
3695         if ( debug_level >= DEBUG_LEVEL_INFO )
3696                 printk( "%s(%d):%s release_resources() entry\n",
3697                         __FILE__,__LINE__,info->device_name );
3698
3699         if ( info->irq_requested ) {
3700                 free_irq(info->irq_level, info);
3701                 info->irq_requested = 0;
3702         }
3703
3704         if ( info->shared_mem_requested ) {
3705                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3706                 info->shared_mem_requested = 0;
3707         }
3708         if ( info->lcr_mem_requested ) {
3709                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3710                 info->lcr_mem_requested = 0;
3711         }
3712         if ( info->sca_base_requested ) {
3713                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3714                 info->sca_base_requested = 0;
3715         }
3716         if ( info->sca_statctrl_requested ) {
3717                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3718                 info->sca_statctrl_requested = 0;
3719         }
3720
3721         if (info->memory_base){
3722                 iounmap(info->memory_base);
3723                 info->memory_base = NULL;
3724         }
3725
3726         if (info->sca_base) {
3727                 iounmap(info->sca_base - info->sca_offset);
3728                 info->sca_base=NULL;
3729         }
3730
3731         if (info->statctrl_base) {
3732                 iounmap(info->statctrl_base - info->statctrl_offset);
3733                 info->statctrl_base=NULL;
3734         }
3735
3736         if (info->lcr_base){
3737                 iounmap(info->lcr_base - info->lcr_offset);
3738                 info->lcr_base = NULL;
3739         }
3740
3741         if ( debug_level >= DEBUG_LEVEL_INFO )
3742                 printk( "%s(%d):%s release_resources() exit\n",
3743                         __FILE__,__LINE__,info->device_name );
3744 }
3745
3746 /* Add the specified device instance data structure to the
3747  * global linked list of devices and increment the device count.
3748  */
3749 void add_device(SLMP_INFO *info)
3750 {
3751         info->next_device = NULL;
3752         info->line = synclinkmp_device_count;
3753         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3754
3755         if (info->line < MAX_DEVICES) {
3756                 if (maxframe[info->line])
3757                         info->max_frame_size = maxframe[info->line];
3758                 info->dosyncppp = dosyncppp[info->line];
3759         }
3760
3761         synclinkmp_device_count++;
3762
3763         if ( !synclinkmp_device_list )
3764                 synclinkmp_device_list = info;
3765         else {
3766                 SLMP_INFO *current_dev = synclinkmp_device_list;
3767                 while( current_dev->next_device )
3768                         current_dev = current_dev->next_device;
3769                 current_dev->next_device = info;
3770         }
3771
3772         if ( info->max_frame_size < 4096 )
3773                 info->max_frame_size = 4096;
3774         else if ( info->max_frame_size > 65535 )
3775                 info->max_frame_size = 65535;
3776
3777         printk( "SyncLink MultiPort %s: "
3778                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3779                 info->device_name,
3780                 info->phys_sca_base,
3781                 info->phys_memory_base,
3782                 info->phys_statctrl_base,
3783                 info->phys_lcr_base,
3784                 info->irq_level,
3785                 info->max_frame_size );
3786
3787 #ifdef CONFIG_HDLC
3788         hdlcdev_init(info);
3789 #endif
3790 }
3791
3792 /* Allocate and initialize a device instance structure
3793  *
3794  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3795  */
3796 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3797 {
3798         SLMP_INFO *info;
3799
3800         info = (SLMP_INFO *)kmalloc(sizeof(SLMP_INFO),
3801                  GFP_KERNEL);
3802
3803         if (!info) {
3804                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3805                         __FILE__,__LINE__, adapter_num, port_num);
3806         } else {
3807                 memset(info, 0, sizeof(SLMP_INFO));
3808                 info->magic = MGSL_MAGIC;
3809                 INIT_WORK(&info->task, bh_handler, info);
3810                 info->max_frame_size = 4096;
3811                 info->close_delay = 5*HZ/10;
3812                 info->closing_wait = 30*HZ;
3813                 init_waitqueue_head(&info->open_wait);
3814                 init_waitqueue_head(&info->close_wait);
3815                 init_waitqueue_head(&info->status_event_wait_q);
3816                 init_waitqueue_head(&info->event_wait_q);
3817                 spin_lock_init(&info->netlock);
3818                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3819                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3820                 info->adapter_num = adapter_num;
3821                 info->port_num = port_num;
3822
3823                 /* Copy configuration info to device instance data */
3824                 info->irq_level = pdev->irq;
3825                 info->phys_lcr_base = pci_resource_start(pdev,0);
3826                 info->phys_sca_base = pci_resource_start(pdev,2);
3827                 info->phys_memory_base = pci_resource_start(pdev,3);
3828                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3829
3830                 /* Because veremap only works on page boundaries we must map
3831                  * a larger area than is actually implemented for the LCR
3832                  * memory range. We map a full page starting at the page boundary.
3833                  */
3834                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3835                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3836
3837                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3838                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3839
3840                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3841                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3842
3843                 info->bus_type = MGSL_BUS_TYPE_PCI;
3844                 info->irq_flags = IRQF_SHARED;
3845
3846                 init_timer(&info->tx_timer);
3847                 info->tx_timer.data = (unsigned long)info;
3848                 info->tx_timer.function = tx_timeout;
3849
3850                 init_timer(&info->status_timer);
3851                 info->status_timer.data = (unsigned long)info;
3852                 info->status_timer.function = status_timeout;
3853
3854                 /* Store the PCI9050 misc control register value because a flaw
3855                  * in the PCI9050 prevents LCR registers from being read if
3856                  * BIOS assigns an LCR base address with bit 7 set.
3857                  *
3858                  * Only the misc control register is accessed for which only
3859                  * write access is needed, so set an initial value and change
3860                  * bits to the device instance data as we write the value
3861                  * to the actual misc control register.
3862                  */
3863                 info->misc_ctrl_value = 0x087e4546;
3864
3865                 /* initial port state is unknown - if startup errors
3866                  * occur, init_error will be set to indicate the
3867                  * problem. Once the port is fully initialized,
3868                  * this value will be set to 0 to indicate the
3869                  * port is available.
3870                  */
3871                 info->init_error = -1;
3872         }
3873
3874         return info;
3875 }
3876
3877 void device_init(int adapter_num, struct pci_dev *pdev)
3878 {
3879         SLMP_INFO *port_array[SCA_MAX_PORTS];
3880         int port;
3881
3882         /* allocate device instances for up to SCA_MAX_PORTS devices */
3883         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3884                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3885                 if( port_array[port] == NULL ) {
3886                         for ( --port; port >= 0; --port )
3887                                 kfree(port_array[port]);
3888                         return;
3889                 }
3890         }
3891
3892         /* give copy of port_array to all ports and add to device list  */
3893         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3894                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3895                 add_device( port_array[port] );
3896                 spin_lock_init(&port_array[port]->lock);
3897         }
3898
3899         /* Allocate and claim adapter resources */
3900         if ( !claim_resources(port_array[0]) ) {
3901
3902                 alloc_dma_bufs(port_array[0]);
3903
3904                 /* copy resource information from first port to others */
3905                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3906                         port_array[port]->lock  = port_array[0]->lock;
3907                         port_array[port]->irq_level     = port_array[0]->irq_level;
3908                         port_array[port]->memory_base   = port_array[0]->memory_base;
3909                         port_array[port]->sca_base      = port_array[0]->sca_base;
3910                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3911                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3912                         alloc_dma_bufs(port_array[port]);
3913                 }
3914
3915                 if ( request_irq(port_array[0]->irq_level,
3916                                         synclinkmp_interrupt,
3917                                         port_array[0]->irq_flags,
3918                                         port_array[0]->device_name,
3919                                         port_array[0]) < 0 ) {
3920                         printk( "%s(%d):%s Cant request interrupt, IRQ=%d\n",
3921                                 __FILE__,__LINE__,
3922                                 port_array[0]->device_name,
3923                                 port_array[0]->irq_level );
3924                 }
3925                 else {
3926                         port_array[0]->irq_requested = 1;
3927                         adapter_test(port_array[0]);
3928                 }
3929         }
3930 }
3931
3932 static const struct tty_operations ops = {
3933         .open = open,
3934         .close = close,
3935         .write = write,
3936         .put_char = put_char,
3937         .flush_chars = flush_chars,
3938         .write_room = write_room,
3939         .chars_in_buffer = chars_in_buffer,
3940         .flush_buffer = flush_buffer,
3941         .ioctl = ioctl,
3942         .throttle = throttle,
3943         .unthrottle = unthrottle,
3944         .send_xchar = send_xchar,
3945         .break_ctl = set_break,
3946         .wait_until_sent = wait_until_sent,
3947         .read_proc = read_proc,
3948         .set_termios = set_termios,
3949         .stop = tx_hold,
3950         .start = tx_release,
3951         .hangup = hangup,
3952         .tiocmget = tiocmget,
3953         .tiocmset = tiocmset,
3954 };
3955
3956 static void synclinkmp_cleanup(void)
3957 {
3958         int rc;
3959         SLMP_INFO *info;
3960         SLMP_INFO *tmp;
3961
3962         printk("Unloading %s %s\n", driver_name, driver_version);
3963
3964         if (serial_driver) {
3965                 if ((rc = tty_unregister_driver(serial_driver)))
3966                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3967                                __FILE__,__LINE__,rc);
3968                 put_tty_driver(serial_driver);
3969         }
3970
3971         /* reset devices */
3972         info = synclinkmp_device_list;
3973         while(info) {
3974                 reset_port(info);
3975                 info = info->next_device;
3976         }
3977
3978         /* release devices */
3979         info = synclinkmp_device_list;
3980         while(info) {
3981 #ifdef CONFIG_HDLC
3982                 hdlcdev_exit(info);
3983 #endif
3984                 free_dma_bufs(info);
3985                 free_tmp_rx_buf(info);
3986                 if ( info->port_num == 0 ) {
3987                         if (info->sca_base)
3988                                 write_reg(info, LPR, 1); /* set low power mode */
3989                         release_resources(info);
3990                 }
3991                 tmp = info;
3992                 info = info->next_device;
3993                 kfree(tmp);
3994         }
3995
3996         pci_unregister_driver(&synclinkmp_pci_driver);
3997 }
3998
3999 /* Driver initialization entry point.
4000  */
4001
4002 static int __init synclinkmp_init(void)
4003 {
4004         int rc;
4005
4006         if (break_on_load) {
4007                 synclinkmp_get_text_ptr();
4008                 BREAKPOINT();
4009         }
4010
4011         printk("%s %s\n", driver_name, driver_version);
4012
4013         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
4014                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4015                 return rc;
4016         }
4017
4018         serial_driver = alloc_tty_driver(128);
4019         if (!serial_driver) {
4020                 rc = -ENOMEM;
4021                 goto error;
4022         }
4023
4024         /* Initialize the tty_driver structure */
4025
4026         serial_driver->owner = THIS_MODULE;
4027         serial_driver->driver_name = "synclinkmp";
4028         serial_driver->name = "ttySLM";
4029         serial_driver->major = ttymajor;
4030         serial_driver->minor_start = 64;
4031         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4032         serial_driver->subtype = SERIAL_TYPE_NORMAL;
4033         serial_driver->init_termios = tty_std_termios;
4034         serial_driver->init_termios.c_cflag =
4035                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4036         serial_driver->flags = TTY_DRIVER_REAL_RAW;
4037         tty_set_operations(serial_driver, &ops);
4038         if ((rc = tty_register_driver(serial_driver)) < 0) {
4039                 printk("%s(%d):Couldn't register serial driver\n",
4040                         __FILE__,__LINE__);
4041                 put_tty_driver(serial_driver);
4042                 serial_driver = NULL;
4043                 goto error;
4044         }
4045
4046         printk("%s %s, tty major#%d\n",
4047                 driver_name, driver_version,
4048                 serial_driver->major);
4049
4050         return 0;
4051
4052 error:
4053         synclinkmp_cleanup();
4054         return rc;
4055 }
4056
4057 static void __exit synclinkmp_exit(void)
4058 {
4059         synclinkmp_cleanup();
4060 }
4061
4062 module_init(synclinkmp_init);
4063 module_exit(synclinkmp_exit);
4064
4065 /* Set the port for internal loopback mode.
4066  * The TxCLK and RxCLK signals are generated from the BRG and
4067  * the TxD is looped back to the RxD internally.
4068  */
4069 void enable_loopback(SLMP_INFO *info, int enable)
4070 {
4071         if (enable) {
4072                 /* MD2 (Mode Register 2)
4073                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4074                  */
4075                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4076
4077                 /* degate external TxC clock source */
4078                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4079                 write_control_reg(info);
4080
4081                 /* RXS/TXS (Rx/Tx clock source)
4082                  * 07      Reserved, must be 0
4083                  * 06..04  Clock Source, 100=BRG
4084                  * 03..00  Clock Divisor, 0000=1
4085                  */
4086                 write_reg(info, RXS, 0x40);
4087                 write_reg(info, TXS, 0x40);
4088
4089         } else {
4090                 /* MD2 (Mode Register 2)
4091                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4092                  */
4093                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4094
4095                 /* RXS/TXS (Rx/Tx clock source)
4096                  * 07      Reserved, must be 0
4097                  * 06..04  Clock Source, 000=RxC/TxC Pin
4098                  * 03..00  Clock Divisor, 0000=1
4099                  */
4100                 write_reg(info, RXS, 0x00);
4101                 write_reg(info, TXS, 0x00);
4102         }
4103
4104         /* set LinkSpeed if available, otherwise default to 2Mbps */
4105         if (info->params.clock_speed)
4106                 set_rate(info, info->params.clock_speed);
4107         else
4108                 set_rate(info, 3686400);
4109 }
4110
4111 /* Set the baud rate register to the desired speed
4112  *
4113  *      data_rate       data rate of clock in bits per second
4114  *                      A data rate of 0 disables the AUX clock.
4115  */
4116 void set_rate( SLMP_INFO *info, u32 data_rate )
4117 {
4118         u32 TMCValue;
4119         unsigned char BRValue;
4120         u32 Divisor=0;
4121
4122         /* fBRG = fCLK/(TMC * 2^BR)
4123          */
4124         if (data_rate != 0) {
4125                 Divisor = 14745600/data_rate;
4126                 if (!Divisor)
4127                         Divisor = 1;
4128
4129                 TMCValue = Divisor;
4130
4131                 BRValue = 0;
4132                 if (TMCValue != 1 && TMCValue != 2) {
4133                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4134                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4135                          * 50/50 duty cycle.
4136                          */
4137                         BRValue = 1;
4138                         TMCValue >>= 1;
4139                 }
4140
4141                 /* while TMCValue is too big for TMC register, divide
4142                  * by 2 and increment BR exponent.
4143                  */
4144                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4145                         TMCValue >>= 1;
4146
4147                 write_reg(info, TXS,
4148                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4149                 write_reg(info, RXS,
4150                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4151                 write_reg(info, TMC, (unsigned char)TMCValue);
4152         }
4153         else {
4154                 write_reg(info, TXS,0);
4155                 write_reg(info, RXS,0);
4156                 write_reg(info, TMC, 0);
4157         }
4158 }
4159
4160 /* Disable receiver
4161  */
4162 void rx_stop(SLMP_INFO *info)
4163 {
4164         if (debug_level >= DEBUG_LEVEL_ISR)
4165                 printk("%s(%d):%s rx_stop()\n",
4166                          __FILE__,__LINE__, info->device_name );
4167
4168         write_reg(info, CMD, RXRESET);
4169
4170         info->ie0_value &= ~RXRDYE;
4171         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4172
4173         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4174         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4175         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4176
4177         info->rx_enabled = 0;
4178         info->rx_overflow = 0;
4179 }
4180
4181 /* enable the receiver
4182  */
4183 void rx_start(SLMP_INFO *info)
4184 {
4185         int i;
4186
4187         if (debug_level >= DEBUG_LEVEL_ISR)
4188                 printk("%s(%d):%s rx_start()\n",
4189                          __FILE__,__LINE__, info->device_name );
4190
4191         write_reg(info, CMD, RXRESET);
4192
4193         if ( info->params.mode == MGSL_MODE_HDLC ) {
4194                 /* HDLC, disabe IRQ on rxdata */
4195                 info->ie0_value &= ~RXRDYE;
4196                 write_reg(info, IE0, info->ie0_value);
4197
4198                 /* Reset all Rx DMA buffers and program rx dma */
4199                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4200                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4201
4202                 for (i = 0; i < info->rx_buf_count; i++) {
4203                         info->rx_buf_list[i].status = 0xff;
4204
4205                         // throttle to 4 shared memory writes at a time to prevent
4206                         // hogging local bus (keep latency time for DMA requests low).
4207                         if (!(i % 4))
4208                                 read_status_reg(info);
4209                 }
4210                 info->current_rx_buf = 0;
4211
4212                 /* set current/1st descriptor address */
4213                 write_reg16(info, RXDMA + CDA,
4214                         info->rx_buf_list_ex[0].phys_entry);
4215
4216                 /* set new last rx descriptor address */
4217                 write_reg16(info, RXDMA + EDA,
4218                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4219
4220                 /* set buffer length (shared by all rx dma data buffers) */
4221                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4222
4223                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4224                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4225         } else {
4226                 /* async, enable IRQ on rxdata */
4227                 info->ie0_value |= RXRDYE;
4228                 write_reg(info, IE0, info->ie0_value);
4229         }
4230
4231         write_reg(info, CMD, RXENABLE);
4232
4233         info->rx_overflow = FALSE;
4234         info->rx_enabled = 1;
4235 }
4236
4237 /* Enable the transmitter and send a transmit frame if
4238  * one is loaded in the DMA buffers.
4239  */
4240 void tx_start(SLMP_INFO *info)
4241 {
4242         if (debug_level >= DEBUG_LEVEL_ISR)
4243                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4244                          __FILE__,__LINE__, info->device_name,info->tx_count );
4245
4246         if (!info->tx_enabled ) {
4247                 write_reg(info, CMD, TXRESET);
4248                 write_reg(info, CMD, TXENABLE);
4249                 info->tx_enabled = TRUE;
4250         }
4251
4252         if ( info->tx_count ) {
4253
4254                 /* If auto RTS enabled and RTS is inactive, then assert */
4255                 /* RTS and set a flag indicating that the driver should */
4256                 /* negate RTS when the transmission completes. */
4257
4258                 info->drop_rts_on_tx_done = 0;
4259
4260                 if (info->params.mode != MGSL_MODE_ASYNC) {
4261
4262                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4263                                 get_signals( info );
4264                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4265                                         info->serial_signals |= SerialSignal_RTS;
4266                                         set_signals( info );
4267                                         info->drop_rts_on_tx_done = 1;
4268                                 }
4269                         }
4270
4271                         write_reg16(info, TRC0,
4272                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4273
4274                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4275                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4276
4277                         /* set TX CDA (current descriptor address) */
4278                         write_reg16(info, TXDMA + CDA,
4279                                 info->tx_buf_list_ex[0].phys_entry);
4280
4281                         /* set TX EDA (last descriptor address) */
4282                         write_reg16(info, TXDMA + EDA,
4283                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4284
4285                         /* enable underrun IRQ */
4286                         info->ie1_value &= ~IDLE;
4287                         info->ie1_value |= UDRN;
4288                         write_reg(info, IE1, info->ie1_value);
4289                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4290
4291                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4292                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4293
4294                         info->tx_timer.expires = jiffies + msecs_to_jiffies(5000);
4295                         add_timer(&info->tx_timer);
4296                 }
4297                 else {
4298                         tx_load_fifo(info);
4299                         /* async, enable IRQ on txdata */
4300                         info->ie0_value |= TXRDYE;
4301                         write_reg(info, IE0, info->ie0_value);
4302                 }
4303
4304                 info->tx_active = 1;
4305         }
4306 }
4307
4308 /* stop the transmitter and DMA
4309  */
4310 void tx_stop( SLMP_INFO *info )
4311 {
4312         if (debug_level >= DEBUG_LEVEL_ISR)
4313                 printk("%s(%d):%s tx_stop()\n",
4314                          __FILE__,__LINE__, info->device_name );
4315
4316         del_timer(&info->tx_timer);
4317
4318         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4319         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4320
4321         write_reg(info, CMD, TXRESET);
4322
4323         info->ie1_value &= ~(UDRN + IDLE);
4324         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4325         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4326
4327         info->ie0_value &= ~TXRDYE;
4328         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4329
4330         info->tx_enabled = 0;
4331         info->tx_active  = 0;
4332 }
4333
4334 /* Fill the transmit FIFO until the FIFO is full or
4335  * there is no more data to load.
4336  */
4337 void tx_load_fifo(SLMP_INFO *info)
4338 {
4339         u8 TwoBytes[2];
4340
4341         /* do nothing is now tx data available and no XON/XOFF pending */
4342
4343         if ( !info->tx_count && !info->x_char )
4344                 return;
4345
4346         /* load the Transmit FIFO until FIFOs full or all data sent */
4347
4348         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4349
4350                 /* there is more space in the transmit FIFO and */
4351                 /* there is more data in transmit buffer */
4352
4353                 if ( (info->tx_count > 1) && !info->x_char ) {
4354                         /* write 16-bits */
4355                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4356                         if (info->tx_get >= info->max_frame_size)
4357                                 info->tx_get -= info->max_frame_size;
4358                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4359                         if (info->tx_get >= info->max_frame_size)
4360                                 info->tx_get -= info->max_frame_size;
4361
4362                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4363
4364                         info->tx_count -= 2;
4365                         info->icount.tx += 2;
4366                 } else {
4367                         /* only 1 byte left to transmit or 1 FIFO slot left */
4368
4369                         if (info->x_char) {
4370                                 /* transmit pending high priority char */
4371                                 write_reg(info, TRB, info->x_char);
4372                                 info->x_char = 0;
4373                         } else {
4374                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4375                                 if (info->tx_get >= info->max_frame_size)
4376                                         info->tx_get -= info->max_frame_size;
4377                                 info->tx_count--;
4378                         }
4379                         info->icount.tx++;
4380                 }
4381         }
4382 }
4383
4384 /* Reset a port to a known state
4385  */
4386 void reset_port(SLMP_INFO *info)
4387 {
4388         if (info->sca_base) {
4389
4390                 tx_stop(info);
4391                 rx_stop(info);
4392
4393                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4394                 set_signals(info);
4395
4396                 /* disable all port interrupts */
4397                 info->ie0_value = 0;
4398                 info->ie1_value = 0;
4399                 info->ie2_value = 0;
4400                 write_reg(info, IE0, info->ie0_value);
4401                 write_reg(info, IE1, info->ie1_value);
4402                 write_reg(info, IE2, info->ie2_value);
4403
4404                 write_reg(info, CMD, CHRESET);
4405         }
4406 }
4407
4408 /* Reset all the ports to a known state.
4409  */
4410 void reset_adapter(SLMP_INFO *info)
4411 {
4412         int i;
4413
4414         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4415                 if (info->port_array[i])
4416                         reset_port(info->port_array[i]);
4417         }
4418 }
4419
4420 /* Program port for asynchronous communications.
4421  */
4422 void async_mode(SLMP_INFO *info)
4423 {
4424
4425         unsigned char RegValue;
4426
4427         tx_stop(info);
4428         rx_stop(info);
4429
4430         /* MD0, Mode Register 0
4431          *
4432          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4433          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4434          * 03      Reserved, must be 0
4435          * 02      CRCCC, CRC Calculation, 0=disabled
4436          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4437          *
4438          * 0000 0000
4439          */
4440         RegValue = 0x00;
4441         if (info->params.stop_bits != 1)
4442                 RegValue |= BIT1;
4443         write_reg(info, MD0, RegValue);
4444
4445         /* MD1, Mode Register 1
4446          *
4447          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4448          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4449          * 03..02  RXCHR<1..0>, rx char size
4450          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4451          *
4452          * 0100 0000
4453          */
4454         RegValue = 0x40;
4455         switch (info->params.data_bits) {
4456         case 7: RegValue |= BIT4 + BIT2; break;
4457         case 6: RegValue |= BIT5 + BIT3; break;
4458         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4459         }
4460         if (info->params.parity != ASYNC_PARITY_NONE) {
4461                 RegValue |= BIT1;
4462                 if (info->params.parity == ASYNC_PARITY_ODD)
4463                         RegValue |= BIT0;
4464         }
4465         write_reg(info, MD1, RegValue);
4466
4467         /* MD2, Mode Register 2
4468          *
4469          * 07..02  Reserved, must be 0
4470          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4471          *
4472          * 0000 0000
4473          */
4474         RegValue = 0x00;
4475         if (info->params.loopback)
4476                 RegValue |= (BIT1 + BIT0);
4477         write_reg(info, MD2, RegValue);
4478
4479         /* RXS, Receive clock source
4480          *
4481          * 07      Reserved, must be 0
4482          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4483          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4484          */
4485         RegValue=BIT6;
4486         write_reg(info, RXS, RegValue);
4487
4488         /* TXS, Transmit clock source
4489          *
4490          * 07      Reserved, must be 0
4491          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4492          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4493          */
4494         RegValue=BIT6;
4495         write_reg(info, TXS, RegValue);
4496
4497         /* Control Register
4498          *
4499          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4500          */
4501         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4502         write_control_reg(info);
4503
4504         tx_set_idle(info);
4505
4506         /* RRC Receive Ready Control 0
4507          *
4508          * 07..05  Reserved, must be 0
4509          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4510          */
4511         write_reg(info, RRC, 0x00);
4512
4513         /* TRC0 Transmit Ready Control 0
4514          *
4515          * 07..05  Reserved, must be 0
4516          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4517          */
4518         write_reg(info, TRC0, 0x10);
4519
4520         /* TRC1 Transmit Ready Control 1
4521          *
4522          * 07..05  Reserved, must be 0
4523          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4524          */
4525         write_reg(info, TRC1, 0x1e);
4526
4527         /* CTL, MSCI control register
4528          *
4529          * 07..06  Reserved, set to 0
4530          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4531          * 04      IDLC, idle control, 0=mark 1=idle register
4532          * 03      BRK, break, 0=off 1 =on (async)
4533          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4534          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4535          * 00      RTS, RTS output control, 0=active 1=inactive
4536          *
4537          * 0001 0001
4538          */
4539         RegValue = 0x10;
4540         if (!(info->serial_signals & SerialSignal_RTS))
4541                 RegValue |= 0x01;
4542         write_reg(info, CTL, RegValue);
4543
4544         /* enable status interrupts */
4545         info->ie0_value |= TXINTE + RXINTE;
4546         write_reg(info, IE0, info->ie0_value);
4547
4548         /* enable break detect interrupt */
4549         info->ie1_value = BRKD;
4550         write_reg(info, IE1, info->ie1_value);
4551
4552         /* enable rx overrun interrupt */
4553         info->ie2_value = OVRN;
4554         write_reg(info, IE2, info->ie2_value);
4555
4556         set_rate( info, info->params.data_rate * 16 );
4557 }
4558
4559 /* Program the SCA for HDLC communications.
4560  */
4561 void hdlc_mode(SLMP_INFO *info)
4562 {
4563         unsigned char RegValue;
4564         u32 DpllDivisor;
4565
4566         // Can't use DPLL because SCA outputs recovered clock on RxC when
4567         // DPLL mode selected. This causes output contention with RxC receiver.
4568         // Use of DPLL would require external hardware to disable RxC receiver
4569         // when DPLL mode selected.
4570         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4571
4572         /* disable DMA interrupts */
4573         write_reg(info, TXDMA + DIR, 0);
4574         write_reg(info, RXDMA + DIR, 0);
4575
4576         /* MD0, Mode Register 0
4577          *
4578          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4579          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4580          * 03      Reserved, must be 0
4581          * 02      CRCCC, CRC Calculation, 1=enabled
4582          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4583          * 00      CRC0, CRC initial value, 1 = all 1s
4584          *
4585          * 1000 0001
4586          */
4587         RegValue = 0x81;
4588         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4589                 RegValue |= BIT4;
4590         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4591                 RegValue |= BIT4;
4592         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4593                 RegValue |= BIT2 + BIT1;
4594         write_reg(info, MD0, RegValue);
4595
4596         /* MD1, Mode Register 1
4597          *
4598          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4599          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4600          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4601          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4602          *
4603          * 0000 0000
4604          */
4605         RegValue = 0x00;
4606         write_reg(info, MD1, RegValue);
4607
4608         /* MD2, Mode Register 2
4609          *
4610          * 07      NRZFM, 0=NRZ, 1=FM
4611          * 06..05  CODE<1..0> Encoding, 00=NRZ
4612          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4613          * 02      Reserved, must be 0
4614          * 01..00  CNCT<1..0> Channel connection, 0=normal
4615          *
4616          * 0000 0000
4617          */
4618         RegValue = 0x00;
4619         switch(info->params.encoding) {
4620         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4621         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4622         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4623         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4624 #if 0
4625         case HDLC_ENCODING_NRZB:                                        /* not supported */
4626         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4627         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4628 #endif
4629         }
4630         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4631                 DpllDivisor = 16;
4632                 RegValue |= BIT3;
4633         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4634                 DpllDivisor = 8;
4635         } else {
4636                 DpllDivisor = 32;
4637                 RegValue |= BIT4;
4638         }
4639         write_reg(info, MD2, RegValue);
4640
4641
4642         /* RXS, Receive clock source
4643          *
4644          * 07      Reserved, must be 0
4645          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4646          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4647          */
4648         RegValue=0;
4649         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4650                 RegValue |= BIT6;
4651         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4652                 RegValue |= BIT6 + BIT5;
4653         write_reg(info, RXS, RegValue);
4654
4655         /* TXS, Transmit clock source
4656          *
4657          * 07      Reserved, must be 0
4658          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4659          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4660          */
4661         RegValue=0;
4662         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4663                 RegValue |= BIT6;
4664         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4665                 RegValue |= BIT6 + BIT5;
4666         write_reg(info, TXS, RegValue);
4667
4668         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4669                 set_rate(info, info->params.clock_speed * DpllDivisor);
4670         else
4671                 set_rate(info, info->params.clock_speed);
4672
4673         /* GPDATA (General Purpose I/O Data Register)
4674          *
4675          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4676          */
4677         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4678                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4679         else
4680                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4681         write_control_reg(info);
4682
4683         /* RRC Receive Ready Control 0
4684          *
4685          * 07..05  Reserved, must be 0
4686          * 04..00  RRC<4..0> Rx FIFO trigger active
4687          */
4688         write_reg(info, RRC, rx_active_fifo_level);
4689
4690         /* TRC0 Transmit Ready Control 0
4691          *
4692          * 07..05  Reserved, must be 0
4693          * 04..00  TRC<4..0> Tx FIFO trigger active
4694          */
4695         write_reg(info, TRC0, tx_active_fifo_level);
4696
4697         /* TRC1 Transmit Ready Control 1
4698          *
4699          * 07..05  Reserved, must be 0
4700          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4701          */
4702         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4703
4704         /* DMR, DMA Mode Register
4705          *
4706          * 07..05  Reserved, must be 0
4707          * 04      TMOD, Transfer Mode: 1=chained-block
4708          * 03      Reserved, must be 0
4709          * 02      NF, Number of Frames: 1=multi-frame
4710          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4711          * 00      Reserved, must be 0
4712          *
4713          * 0001 0100
4714          */
4715         write_reg(info, TXDMA + DMR, 0x14);
4716         write_reg(info, RXDMA + DMR, 0x14);
4717
4718         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4719         write_reg(info, RXDMA + CPB,
4720                 (unsigned char)(info->buffer_list_phys >> 16));
4721
4722         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4723         write_reg(info, TXDMA + CPB,
4724                 (unsigned char)(info->buffer_list_phys >> 16));
4725
4726         /* enable status interrupts. other code enables/disables
4727          * the individual sources for these two interrupt classes.
4728          */
4729         info->ie0_value |= TXINTE + RXINTE;
4730         write_reg(info, IE0, info->ie0_value);
4731
4732         /* CTL, MSCI control register
4733          *
4734          * 07..06  Reserved, set to 0
4735          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4736          * 04      IDLC, idle control, 0=mark 1=idle register
4737          * 03      BRK, break, 0=off 1 =on (async)
4738          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4739          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4740          * 00      RTS, RTS output control, 0=active 1=inactive
4741          *
4742          * 0001 0001
4743          */
4744         RegValue = 0x10;
4745         if (!(info->serial_signals & SerialSignal_RTS))
4746                 RegValue |= 0x01;
4747         write_reg(info, CTL, RegValue);
4748
4749         /* preamble not supported ! */
4750
4751         tx_set_idle(info);
4752         tx_stop(info);
4753         rx_stop(info);
4754
4755         set_rate(info, info->params.clock_speed);
4756
4757         if (info->params.loopback)
4758                 enable_loopback(info,1);
4759 }
4760
4761 /* Set the transmit HDLC idle mode
4762  */
4763 void tx_set_idle(SLMP_INFO *info)
4764 {
4765         unsigned char RegValue = 0xff;
4766
4767         /* Map API idle mode to SCA register bits */
4768         switch(info->idle_mode) {
4769         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4770         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4771         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4772         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4773         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4774         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4775         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4776         }
4777
4778         write_reg(info, IDL, RegValue);
4779 }
4780
4781 /* Query the adapter for the state of the V24 status (input) signals.
4782  */
4783 void get_signals(SLMP_INFO *info)
4784 {
4785         u16 status = read_reg(info, SR3);
4786         u16 gpstatus = read_status_reg(info);
4787         u16 testbit;
4788
4789         /* clear all serial signals except DTR and RTS */
4790         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4791
4792         /* set serial signal bits to reflect MISR */
4793
4794         if (!(status & BIT3))
4795                 info->serial_signals |= SerialSignal_CTS;
4796
4797         if ( !(status & BIT2))
4798                 info->serial_signals |= SerialSignal_DCD;
4799
4800         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4801         if (!(gpstatus & testbit))
4802                 info->serial_signals |= SerialSignal_RI;
4803
4804         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4805         if (!(gpstatus & testbit))
4806                 info->serial_signals |= SerialSignal_DSR;
4807 }
4808
4809 /* Set the state of DTR and RTS based on contents of
4810  * serial_signals member of device context.
4811  */
4812 void set_signals(SLMP_INFO *info)
4813 {
4814         unsigned char RegValue;
4815         u16 EnableBit;
4816
4817         RegValue = read_reg(info, CTL);
4818         if (info->serial_signals & SerialSignal_RTS)
4819                 RegValue &= ~BIT0;
4820         else
4821                 RegValue |= BIT0;
4822         write_reg(info, CTL, RegValue);
4823
4824         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4825         EnableBit = BIT1 << (info->port_num*2);
4826         if (info->serial_signals & SerialSignal_DTR)
4827                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4828         else
4829                 info->port_array[0]->ctrlreg_value |= EnableBit;
4830         write_control_reg(info);
4831 }
4832
4833 /*******************/
4834 /* DMA Buffer Code */
4835 /*******************/
4836
4837 /* Set the count for all receive buffers to SCABUFSIZE
4838  * and set the current buffer to the first buffer. This effectively
4839  * makes all buffers free and discards any data in buffers.
4840  */
4841 void rx_reset_buffers(SLMP_INFO *info)
4842 {
4843         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4844 }
4845
4846 /* Free the buffers used by a received frame
4847  *
4848  * info   pointer to device instance data
4849  * first  index of 1st receive buffer of frame
4850  * last   index of last receive buffer of frame
4851  */
4852 void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4853 {
4854         int done = 0;
4855
4856         while(!done) {
4857                 /* reset current buffer for reuse */
4858                 info->rx_buf_list[first].status = 0xff;
4859
4860                 if (first == last) {
4861                         done = 1;
4862                         /* set new last rx descriptor address */
4863                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4864                 }
4865
4866                 first++;
4867                 if (first == info->rx_buf_count)
4868                         first = 0;
4869         }
4870
4871         /* set current buffer to next buffer after last buffer of frame */
4872         info->current_rx_buf = first;
4873 }
4874
4875 /* Return a received frame from the receive DMA buffers.
4876  * Only frames received without errors are returned.
4877  *
4878  * Return Value:        1 if frame returned, otherwise 0
4879  */
4880 int rx_get_frame(SLMP_INFO *info)
4881 {
4882         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4883         unsigned short status;
4884         unsigned int framesize = 0;
4885         int ReturnCode = 0;
4886         unsigned long flags;
4887         struct tty_struct *tty = info->tty;
4888         unsigned char addr_field = 0xff;
4889         SCADESC *desc;
4890         SCADESC_EX *desc_ex;
4891
4892 CheckAgain:
4893         /* assume no frame returned, set zero length */
4894         framesize = 0;
4895         addr_field = 0xff;
4896
4897         /*
4898          * current_rx_buf points to the 1st buffer of the next available
4899          * receive frame. To find the last buffer of the frame look for
4900          * a non-zero status field in the buffer entries. (The status
4901          * field is set by the 16C32 after completing a receive frame.
4902          */
4903         StartIndex = EndIndex = info->current_rx_buf;
4904
4905         for ( ;; ) {
4906                 desc = &info->rx_buf_list[EndIndex];
4907                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4908
4909                 if (desc->status == 0xff)
4910                         goto Cleanup;   /* current desc still in use, no frames available */
4911
4912                 if (framesize == 0 && info->params.addr_filter != 0xff)
4913                         addr_field = desc_ex->virt_addr[0];
4914
4915                 framesize += desc->length;
4916
4917                 /* Status != 0 means last buffer of frame */
4918                 if (desc->status)
4919                         break;
4920
4921                 EndIndex++;
4922                 if (EndIndex == info->rx_buf_count)
4923                         EndIndex = 0;
4924
4925                 if (EndIndex == info->current_rx_buf) {
4926                         /* all buffers have been 'used' but none mark      */
4927                         /* the end of a frame. Reset buffers and receiver. */
4928                         if ( info->rx_enabled ){
4929                                 spin_lock_irqsave(&info->lock,flags);
4930                                 rx_start(info);
4931                                 spin_unlock_irqrestore(&info->lock,flags);
4932                         }
4933                         goto Cleanup;
4934                 }
4935
4936         }
4937
4938         /* check status of receive frame */
4939
4940         /* frame status is byte stored after frame data
4941          *
4942          * 7 EOM (end of msg), 1 = last buffer of frame
4943          * 6 Short Frame, 1 = short frame
4944          * 5 Abort, 1 = frame aborted
4945          * 4 Residue, 1 = last byte is partial
4946          * 3 Overrun, 1 = overrun occurred during frame reception
4947          * 2 CRC,     1 = CRC error detected
4948          *
4949          */
4950         status = desc->status;
4951
4952         /* ignore CRC bit if not using CRC (bit is undefined) */
4953         /* Note:CRC is not save to data buffer */
4954         if (info->params.crc_type == HDLC_CRC_NONE)
4955                 status &= ~BIT2;
4956
4957         if (framesize == 0 ||
4958                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4959                 /* discard 0 byte frames, this seems to occur sometime
4960                  * when remote is idling flags.
4961                  */
4962                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4963                 goto CheckAgain;
4964         }
4965
4966         if (framesize < 2)
4967                 status |= BIT6;
4968
4969         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4970                 /* received frame has errors,
4971                  * update counts and mark frame size as 0
4972                  */
4973                 if (status & BIT6)
4974                         info->icount.rxshort++;
4975                 else if (status & BIT5)
4976                         info->icount.rxabort++;
4977                 else if (status & BIT3)
4978                         info->icount.rxover++;
4979                 else
4980                         info->icount.rxcrc++;
4981
4982                 framesize = 0;
4983 #ifdef CONFIG_HDLC
4984                 {
4985                         struct net_device_stats *stats = hdlc_stats(info->netdev);
4986                         stats->rx_errors++;
4987                         stats->rx_frame_errors++;
4988                 }
4989 #endif
4990         }
4991
4992         if ( debug_level >= DEBUG_LEVEL_BH )
4993                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4994                         __FILE__,__LINE__,info->device_name,status,framesize);
4995
4996         if ( debug_level >= DEBUG_LEVEL_DATA )
4997                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4998                         min_t(int, framesize,SCABUFSIZE),0);
4999
5000         if (framesize) {
5001                 if (framesize > info->max_frame_size)
5002                         info->icount.rxlong++;
5003                 else {
5004                         /* copy dma buffer(s) to contiguous intermediate buffer */
5005                         int copy_count = framesize;
5006                         int index = StartIndex;
5007                         unsigned char *ptmp = info->tmp_rx_buf;
5008                         info->tmp_rx_buf_count = framesize;
5009
5010                         info->icount.rxok++;
5011
5012                         while(copy_count) {
5013                                 int partial_count = min(copy_count,SCABUFSIZE);
5014                                 memcpy( ptmp,
5015                                         info->rx_buf_list_ex[index].virt_addr,
5016                                         partial_count );
5017                                 ptmp += partial_count;
5018                                 copy_count -= partial_count;
5019
5020                                 if ( ++index == info->rx_buf_count )
5021                                         index = 0;
5022                         }
5023
5024 #ifdef CONFIG_HDLC
5025                         if (info->netcount)
5026                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
5027                         else
5028 #endif
5029                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
5030                                                   info->flag_buf, framesize);
5031                 }
5032         }
5033         /* Free the buffers used by this frame. */
5034         rx_free_frame_buffers( info, StartIndex, EndIndex );
5035
5036         ReturnCode = 1;
5037
5038 Cleanup:
5039         if ( info->rx_enabled && info->rx_overflow ) {
5040                 /* Receiver is enabled, but needs to restarted due to
5041                  * rx buffer overflow. If buffers are empty, restart receiver.
5042                  */
5043                 if (info->rx_buf_list[EndIndex].status == 0xff) {
5044                         spin_lock_irqsave(&info->lock,flags);
5045                         rx_start(info);
5046                         spin_unlock_irqrestore(&info->lock,flags);
5047                 }
5048         }
5049
5050         return ReturnCode;
5051 }
5052
5053 /* load the transmit DMA buffer with data
5054  */
5055 void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5056 {
5057         unsigned short copy_count;
5058         unsigned int i = 0;
5059         SCADESC *desc;
5060         SCADESC_EX *desc_ex;
5061
5062         if ( debug_level >= DEBUG_LEVEL_DATA )
5063                 trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
5064
5065         /* Copy source buffer to one or more DMA buffers, starting with
5066          * the first transmit dma buffer.
5067          */
5068         for(i=0;;)
5069         {
5070                 copy_count = min_t(unsigned short,count,SCABUFSIZE);
5071
5072                 desc = &info->tx_buf_list[i];
5073                 desc_ex = &info->tx_buf_list_ex[i];
5074
5075                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5076
5077                 desc->length = copy_count;
5078                 desc->status = 0;
5079
5080                 buf += copy_count;
5081                 count -= copy_count;
5082
5083                 if (!count)
5084                         break;
5085
5086                 i++;
5087                 if (i >= info->tx_buf_count)
5088                         i = 0;
5089         }
5090
5091         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5092         info->last_tx_buf = ++i;
5093 }
5094
5095 int register_test(SLMP_INFO *info)
5096 {
5097         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5098         static unsigned int count = ARRAY_SIZE(testval);
5099         unsigned int i;
5100         int rc = TRUE;
5101         unsigned long flags;
5102
5103         spin_lock_irqsave(&info->lock,flags);
5104         reset_port(info);
5105
5106         /* assume failure */
5107         info->init_error = DiagStatus_AddressFailure;
5108
5109         /* Write bit patterns to various registers but do it out of */
5110         /* sync, then read back and verify values. */
5111
5112         for (i = 0 ; i < count ; i++) {
5113                 write_reg(info, TMC, testval[i]);
5114                 write_reg(info, IDL, testval[(i+1)%count]);
5115                 write_reg(info, SA0, testval[(i+2)%count]);
5116                 write_reg(info, SA1, testval[(i+3)%count]);
5117
5118                 if ( (read_reg(info, TMC) != testval[i]) ||
5119                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5120                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5121                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5122                 {
5123                         rc = FALSE;
5124                         break;
5125                 }
5126         }
5127
5128         reset_port(info);
5129         spin_unlock_irqrestore(&info->lock,flags);
5130
5131         return rc;
5132 }
5133
5134 int irq_test(SLMP_INFO *info)
5135 {
5136         unsigned long timeout;
5137         unsigned long flags;
5138
5139         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5140
5141         spin_lock_irqsave(&info->lock,flags);
5142         reset_port(info);
5143
5144         /* assume failure */
5145         info->init_error = DiagStatus_IrqFailure;
5146         info->irq_occurred = FALSE;
5147
5148         /* setup timer0 on SCA0 to interrupt */
5149
5150         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5151         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5152
5153         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5154         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5155
5156
5157         /* TMCS, Timer Control/Status Register
5158          *
5159          * 07      CMF, Compare match flag (read only) 1=match
5160          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5161          * 05      Reserved, must be 0
5162          * 04      TME, Timer Enable
5163          * 03..00  Reserved, must be 0
5164          *
5165          * 0101 0000
5166          */
5167         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5168
5169         spin_unlock_irqrestore(&info->lock,flags);
5170
5171         timeout=100;
5172         while( timeout-- && !info->irq_occurred ) {
5173                 msleep_interruptible(10);
5174         }
5175
5176         spin_lock_irqsave(&info->lock,flags);
5177         reset_port(info);
5178         spin_unlock_irqrestore(&info->lock,flags);
5179
5180         return info->irq_occurred;
5181 }
5182
5183 /* initialize individual SCA device (2 ports)
5184  */
5185 static int sca_init(SLMP_INFO *info)
5186 {
5187         /* set wait controller to single mem partition (low), no wait states */
5188         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5189         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5190         write_reg(info, WCRL, 0);       /* wait controller low range */
5191         write_reg(info, WCRM, 0);       /* wait controller mid range */
5192         write_reg(info, WCRH, 0);       /* wait controller high range */
5193
5194         /* DPCR, DMA Priority Control
5195          *
5196          * 07..05  Not used, must be 0
5197          * 04      BRC, bus release condition: 0=all transfers complete
5198          * 03      CCC, channel change condition: 0=every cycle
5199          * 02..00  PR<2..0>, priority 100=round robin
5200          *
5201          * 00000100 = 0x04
5202          */
5203         write_reg(info, DPCR, dma_priority);
5204
5205         /* DMA Master Enable, BIT7: 1=enable all channels */
5206         write_reg(info, DMER, 0x80);
5207
5208         /* enable all interrupt classes */
5209         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5210         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5211         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5212
5213         /* ITCR, interrupt control register
5214          * 07      IPC, interrupt priority, 0=MSCI->DMA
5215          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5216          * 04      VOS, Vector Output, 0=unmodified vector
5217          * 03..00  Reserved, must be 0
5218          */
5219         write_reg(info, ITCR, 0);
5220
5221         return TRUE;
5222 }
5223
5224 /* initialize adapter hardware
5225  */
5226 int init_adapter(SLMP_INFO *info)
5227 {
5228         int i;
5229
5230         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5231         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5232         u32 readval;
5233
5234         info->misc_ctrl_value |= BIT30;
5235         *MiscCtrl = info->misc_ctrl_value;
5236
5237         /*
5238          * Force at least 170ns delay before clearing
5239          * reset bit. Each read from LCR takes at least
5240          * 30ns so 10 times for 300ns to be safe.
5241          */
5242         for(i=0;i<10;i++)
5243                 readval = *MiscCtrl;
5244
5245         info->misc_ctrl_value &= ~BIT30;
5246         *MiscCtrl = info->misc_ctrl_value;
5247
5248         /* init control reg (all DTRs off, all clksel=input) */
5249         info->ctrlreg_value = 0xaa;
5250         write_control_reg(info);
5251
5252         {
5253                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5254                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5255
5256                 switch(read_ahead_count)
5257                 {
5258                 case 16:
5259                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5260                         break;
5261                 case 8:
5262                         lcr1_brdr_value |= BIT5 + BIT4;
5263                         break;
5264                 case 4:
5265                         lcr1_brdr_value |= BIT5 + BIT3;
5266                         break;
5267                 case 0:
5268                         lcr1_brdr_value |= BIT5;
5269                         break;
5270                 }
5271
5272                 *LCR1BRDR = lcr1_brdr_value;
5273                 *MiscCtrl = misc_ctrl_value;
5274         }
5275
5276         sca_init(info->port_array[0]);
5277         sca_init(info->port_array[2]);
5278
5279         return TRUE;
5280 }
5281
5282 /* Loopback an HDLC frame to test the hardware
5283  * interrupt and DMA functions.
5284  */
5285 int loopback_test(SLMP_INFO *info)
5286 {
5287 #define TESTFRAMESIZE 20
5288
5289         unsigned long timeout;
5290         u16 count = TESTFRAMESIZE;
5291         unsigned char buf[TESTFRAMESIZE];
5292         int rc = FALSE;
5293         unsigned long flags;
5294
5295         struct tty_struct *oldtty = info->tty;
5296         u32 speed = info->params.clock_speed;
5297
5298         info->params.clock_speed = 3686400;
5299         info->tty = NULL;
5300
5301         /* assume failure */
5302         info->init_error = DiagStatus_DmaFailure;
5303
5304         /* build and send transmit frame */
5305         for (count = 0; count < TESTFRAMESIZE;++count)
5306                 buf[count] = (unsigned char)count;
5307
5308         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5309
5310         /* program hardware for HDLC and enabled receiver */
5311         spin_lock_irqsave(&info->lock,flags);
5312         hdlc_mode(info);
5313         enable_loopback(info,1);
5314         rx_start(info);
5315         info->tx_count = count;
5316         tx_load_dma_buffer(info,buf,count);
5317         tx_start(info);
5318         spin_unlock_irqrestore(&info->lock,flags);
5319
5320         /* wait for receive complete */
5321         /* Set a timeout for waiting for interrupt. */
5322         for ( timeout = 100; timeout; --timeout ) {
5323                 msleep_interruptible(10);
5324
5325                 if (rx_get_frame(info)) {
5326                         rc = TRUE;
5327                         break;
5328                 }
5329         }
5330
5331         /* verify received frame length and contents */
5332         if (rc == TRUE &&
5333                 ( info->tmp_rx_buf_count != count ||
5334                   memcmp(buf, info->tmp_rx_buf,count))) {
5335                 rc = FALSE;
5336         }
5337
5338         spin_lock_irqsave(&info->lock,flags);
5339         reset_adapter(info);
5340         spin_unlock_irqrestore(&info->lock,flags);
5341
5342         info->params.clock_speed = speed;
5343         info->tty = oldtty;
5344
5345         return rc;
5346 }
5347
5348 /* Perform diagnostics on hardware
5349  */
5350 int adapter_test( SLMP_INFO *info )
5351 {
5352         unsigned long flags;
5353         if ( debug_level >= DEBUG_LEVEL_INFO )
5354                 printk( "%s(%d):Testing device %s\n",
5355                         __FILE__,__LINE__,info->device_name );
5356
5357         spin_lock_irqsave(&info->lock,flags);
5358         init_adapter(info);
5359         spin_unlock_irqrestore(&info->lock,flags);
5360
5361         info->port_array[0]->port_count = 0;
5362
5363         if ( register_test(info->port_array[0]) &&
5364                 register_test(info->port_array[1])) {
5365
5366                 info->port_array[0]->port_count = 2;
5367
5368                 if ( register_test(info->port_array[2]) &&
5369                         register_test(info->port_array[3]) )
5370                         info->port_array[0]->port_count += 2;
5371         }
5372         else {
5373                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5374                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5375                 return -ENODEV;
5376         }
5377
5378         if ( !irq_test(info->port_array[0]) ||
5379                 !irq_test(info->port_array[1]) ||
5380                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5381                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5382                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5383                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5384                 return -ENODEV;
5385         }
5386
5387         if (!loopback_test(info->port_array[0]) ||
5388                 !loopback_test(info->port_array[1]) ||
5389                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5390                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5391                 printk( "%s(%d):DMA test failure for device %s\n",
5392                         __FILE__,__LINE__,info->device_name);
5393                 return -ENODEV;
5394         }
5395
5396         if ( debug_level >= DEBUG_LEVEL_INFO )
5397                 printk( "%s(%d):device %s passed diagnostics\n",
5398                         __FILE__,__LINE__,info->device_name );
5399
5400         info->port_array[0]->init_error = 0;
5401         info->port_array[1]->init_error = 0;
5402         if ( info->port_count > 2 ) {
5403                 info->port_array[2]->init_error = 0;
5404                 info->port_array[3]->init_error = 0;
5405         }
5406
5407         return 0;
5408 }
5409
5410 /* Test the shared memory on a PCI adapter.
5411  */
5412 int memory_test(SLMP_INFO *info)
5413 {
5414         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5415                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5416         unsigned long count = ARRAY_SIZE(testval);
5417         unsigned long i;
5418         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5419         unsigned long * addr = (unsigned long *)info->memory_base;
5420
5421         /* Test data lines with test pattern at one location. */
5422
5423         for ( i = 0 ; i < count ; i++ ) {
5424                 *addr = testval[i];
5425                 if ( *addr != testval[i] )
5426                         return FALSE;
5427         }
5428
5429         /* Test address lines with incrementing pattern over */
5430         /* entire address range. */
5431
5432         for ( i = 0 ; i < limit ; i++ ) {
5433                 *addr = i * 4;
5434                 addr++;
5435         }
5436
5437         addr = (unsigned long *)info->memory_base;
5438
5439         for ( i = 0 ; i < limit ; i++ ) {
5440                 if ( *addr != i * 4 )
5441                         return FALSE;
5442                 addr++;
5443         }
5444
5445         memset( info->memory_base, 0, SCA_MEM_SIZE );
5446         return TRUE;
5447 }
5448
5449 /* Load data into PCI adapter shared memory.
5450  *
5451  * The PCI9050 releases control of the local bus
5452  * after completing the current read or write operation.
5453  *
5454  * While the PCI9050 write FIFO not empty, the
5455  * PCI9050 treats all of the writes as a single transaction
5456  * and does not release the bus. This causes DMA latency problems
5457  * at high speeds when copying large data blocks to the shared memory.
5458  *
5459  * This function breaks a write into multiple transations by
5460  * interleaving a read which flushes the write FIFO and 'completes'
5461  * the write transation. This allows any pending DMA request to gain control
5462  * of the local bus in a timely fasion.
5463  */
5464 void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5465 {
5466         /* A load interval of 16 allows for 4 32-bit writes at */
5467         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5468
5469         unsigned short interval = count / sca_pci_load_interval;
5470         unsigned short i;
5471
5472         for ( i = 0 ; i < interval ; i++ )
5473         {
5474                 memcpy(dest, src, sca_pci_load_interval);
5475                 read_status_reg(info);
5476                 dest += sca_pci_load_interval;
5477                 src += sca_pci_load_interval;
5478         }
5479
5480         memcpy(dest, src, count % sca_pci_load_interval);
5481 }
5482
5483 void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5484 {
5485         int i;
5486         int linecount;
5487         if (xmit)
5488                 printk("%s tx data:\n",info->device_name);
5489         else
5490                 printk("%s rx data:\n",info->device_name);
5491
5492         while(count) {
5493                 if (count > 16)
5494                         linecount = 16;
5495                 else
5496                         linecount = count;
5497
5498                 for(i=0;i<linecount;i++)
5499                         printk("%02X ",(unsigned char)data[i]);
5500                 for(;i<17;i++)
5501                         printk("   ");
5502                 for(i=0;i<linecount;i++) {
5503                         if (data[i]>=040 && data[i]<=0176)
5504                                 printk("%c",data[i]);
5505                         else
5506                                 printk(".");
5507                 }
5508                 printk("\n");
5509
5510                 data  += linecount;
5511                 count -= linecount;
5512         }
5513 }       /* end of trace_block() */
5514
5515 /* called when HDLC frame times out
5516  * update stats and do tx completion processing
5517  */
5518 void tx_timeout(unsigned long context)
5519 {
5520         SLMP_INFO *info = (SLMP_INFO*)context;
5521         unsigned long flags;
5522
5523         if ( debug_level >= DEBUG_LEVEL_INFO )
5524                 printk( "%s(%d):%s tx_timeout()\n",
5525                         __FILE__,__LINE__,info->device_name);
5526         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5527                 info->icount.txtimeout++;
5528         }
5529         spin_lock_irqsave(&info->lock,flags);
5530         info->tx_active = 0;
5531         info->tx_count = info->tx_put = info->tx_get = 0;
5532
5533         spin_unlock_irqrestore(&info->lock,flags);
5534
5535 #ifdef CONFIG_HDLC
5536         if (info->netcount)
5537                 hdlcdev_tx_done(info);
5538         else
5539 #endif
5540                 bh_transmit(info);
5541 }
5542
5543 /* called to periodically check the DSR/RI modem signal input status
5544  */
5545 void status_timeout(unsigned long context)
5546 {
5547         u16 status = 0;
5548         SLMP_INFO *info = (SLMP_INFO*)context;
5549         unsigned long flags;
5550         unsigned char delta;
5551
5552
5553         spin_lock_irqsave(&info->lock,flags);
5554         get_signals(info);
5555         spin_unlock_irqrestore(&info->lock,flags);
5556
5557         /* check for DSR/RI state change */
5558
5559         delta = info->old_signals ^ info->serial_signals;
5560         info->old_signals = info->serial_signals;
5561
5562         if (delta & SerialSignal_DSR)
5563                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5564
5565         if (delta & SerialSignal_RI)
5566                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5567
5568         if (delta & SerialSignal_DCD)
5569                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5570
5571         if (delta & SerialSignal_CTS)
5572                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5573
5574         if (status)
5575                 isr_io_pin(info,status);
5576
5577         info->status_timer.data = (unsigned long)info;
5578         info->status_timer.function = status_timeout;
5579         info->status_timer.expires = jiffies + msecs_to_jiffies(10);
5580         add_timer(&info->status_timer);
5581 }
5582
5583
5584 /* Register Access Routines -
5585  * All registers are memory mapped
5586  */
5587 #define CALC_REGADDR() \
5588         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5589         if (info->port_num > 1) \
5590                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5591         if ( info->port_num & 1) { \
5592                 if (Addr > 0x7f) \
5593                         RegAddr += 0x40;        /* DMA access */ \
5594                 else if (Addr > 0x1f && Addr < 0x60) \
5595                         RegAddr += 0x20;        /* MSCI access */ \
5596         }
5597
5598
5599 unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5600 {
5601         CALC_REGADDR();
5602         return *RegAddr;
5603 }
5604 void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5605 {
5606         CALC_REGADDR();
5607         *RegAddr = Value;
5608 }
5609
5610 u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5611 {
5612         CALC_REGADDR();
5613         return *((u16 *)RegAddr);
5614 }
5615
5616 void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5617 {
5618         CALC_REGADDR();
5619         *((u16 *)RegAddr) = Value;
5620 }
5621
5622 unsigned char read_status_reg(SLMP_INFO * info)
5623 {
5624         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5625         return *RegAddr;
5626 }
5627
5628 void write_control_reg(SLMP_INFO * info)
5629 {
5630         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5631         *RegAddr = info->port_array[0]->ctrlreg_value;
5632 }
5633
5634
5635 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5636                                           const struct pci_device_id *ent)
5637 {
5638         if (pci_enable_device(dev)) {
5639                 printk("error enabling pci device %p\n", dev);
5640                 return -EIO;
5641         }
5642         device_init( ++synclinkmp_adapter_count, dev );
5643         return 0;
5644 }
5645
5646 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5647 {
5648 }