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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 #include <linux/synclink.h>
  70
  71 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
  72 #define SYNCLINK_GENERIC_HDLC 1
  73 #else
  74 #define SYNCLINK_GENERIC_HDLC 0
  75 #endif
  76
  77 #define GET_USER(error,value,addr) error = get_user(value,addr)
  78 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  79 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  80 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  81
  82 #include <asm/uaccess.h>
  83
  84 static MGSL_PARAMS default_params = {
  85         MGSL_MODE_HDLC,                 /* unsigned long mode */
  86         0,                              /* unsigned char loopback; */
  87         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  88         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  89         0,                              /* unsigned long clock_speed; */
  90         0xff,                           /* unsigned char addr_filter; */
  91         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  92         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
  93         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
  94         9600,                           /* unsigned long data_rate; */
  95         8,                              /* unsigned char data_bits; */
  96         1,                              /* unsigned char stop_bits; */
  97         ASYNC_PARITY_NONE               /* unsigned char parity; */
  98 };
  99
 100 /* size in bytes of DMA data buffers */
 101 #define SCABUFSIZE      1024
 102 #define SCA_MEM_SIZE    0x40000
 103 #define SCA_BASE_SIZE   512
 104 #define SCA_REG_SIZE    16
 105 #define SCA_MAX_PORTS   4
 106 #define SCAMAXDESC      128
 107
 108 #define BUFFERLISTSIZE  4096
 109
 110 /* SCA-I style DMA buffer descriptor */
 111 typedef struct _SCADESC
 112 {
 113         u16     next;           /* lower l6 bits of next descriptor addr */
 114         u16     buf_ptr;        /* lower 16 bits of buffer addr */
 115         u8      buf_base;       /* upper 8 bits of buffer addr */
 116         u8      pad1;
 117         u16     length;         /* length of buffer */
 118         u8      status;         /* status of buffer */
 119         u8      pad2;
 120 } SCADESC, *PSCADESC;
 121
 122 typedef struct _SCADESC_EX
 123 {
 124         /* device driver bookkeeping section */
 125         char    *virt_addr;     /* virtual address of data buffer */
 126         u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
 127 } SCADESC_EX, *PSCADESC_EX;
 128
 129 /* The queue of BH actions to be performed */
 130
 131 #define BH_RECEIVE  1
 132 #define BH_TRANSMIT 2
 133 #define BH_STATUS   4
 134
 135 #define IO_PIN_SHUTDOWN_LIMIT 100
 136
 137 struct  _input_signal_events {
 138         int     ri_up;
 139         int     ri_down;
 140         int     dsr_up;
 141         int     dsr_down;
 142         int     dcd_up;
 143         int     dcd_down;
 144         int     cts_up;
 145         int     cts_down;
 146 };
 147
 148 /*
 149  * Device instance data structure
 150  */
 151 typedef struct _synclinkmp_info {
 152         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
 153         int                     magic;
 154         struct tty_port         port;
 155         int                     line;
 156         unsigned short          close_delay;
 157         unsigned short          closing_wait;   /* time to wait before closing */
 158
 159         struct mgsl_icount      icount;
 160
 161         int                     timeout;
 162         int                     x_char;         /* xon/xoff character */
 163         u16                     read_status_mask1;  /* break detection (SR1 indications) */
 164         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
 165         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
 166         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
 167         unsigned char           *tx_buf;
 168         int                     tx_put;
 169         int                     tx_get;
 170         int                     tx_count;
 171
 172         wait_queue_head_t       status_event_wait_q;
 173         wait_queue_head_t       event_wait_q;
 174         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 175         struct _synclinkmp_info *next_device;   /* device list link */
 176         struct timer_list       status_timer;   /* input signal status check timer */
 177
 178         spinlock_t lock;                /* spinlock for synchronizing with ISR */
 179         struct work_struct task;                        /* task structure for scheduling bh */
 180
 181         u32 max_frame_size;                     /* as set by device config */
 182
 183         u32 pending_bh;
 184
 185         bool bh_running;                                /* Protection from multiple */
 186         int isr_overflow;
 187         bool bh_requested;
 188
 189         int dcd_chkcount;                       /* check counts to prevent */
 190         int cts_chkcount;                       /* too many IRQs if a signal */
 191         int dsr_chkcount;                       /* is floating */
 192         int ri_chkcount;
 193
 194         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
 195         unsigned long buffer_list_phys;
 196
 197         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
 198         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
 199         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
 200         unsigned int current_rx_buf;
 201
 202         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
 203         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
 204         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
 205         unsigned int last_tx_buf;
 206
 207         unsigned char *tmp_rx_buf;
 208         unsigned int tmp_rx_buf_count;
 209
 210         bool rx_enabled;
 211         bool rx_overflow;
 212
 213         bool tx_enabled;
 214         bool tx_active;
 215         u32 idle_mode;
 216
 217         unsigned char ie0_value;
 218         unsigned char ie1_value;
 219         unsigned char ie2_value;
 220         unsigned char ctrlreg_value;
 221         unsigned char old_signals;
 222
 223         char device_name[25];                   /* device instance name */
 224
 225         int port_count;
 226         int adapter_num;
 227         int port_num;
 228
 229         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
 230
 231         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
 232
 233         unsigned int irq_level;                 /* interrupt level */
 234         unsigned long irq_flags;
 235         bool irq_requested;                     /* true if IRQ requested */
 236
 237         MGSL_PARAMS params;                     /* communications parameters */
 238
 239         unsigned char serial_signals;           /* current serial signal states */
 240
 241         bool irq_occurred;                      /* for diagnostics use */
 242         unsigned int init_error;                /* Initialization startup error */
 243
 244         u32 last_mem_alloc;
 245         unsigned char* memory_base;             /* shared memory address (PCI only) */
 246         u32 phys_memory_base;
 247         int shared_mem_requested;
 248
 249         unsigned char* sca_base;                /* HD64570 SCA Memory address */
 250         u32 phys_sca_base;
 251         u32 sca_offset;
 252         bool sca_base_requested;
 253
 254         unsigned char* lcr_base;                /* local config registers (PCI only) */
 255         u32 phys_lcr_base;
 256         u32 lcr_offset;
 257         int lcr_mem_requested;
 258
 259         unsigned char* statctrl_base;           /* status/control register memory */
 260         u32 phys_statctrl_base;
 261         u32 statctrl_offset;
 262         bool sca_statctrl_requested;
 263
 264         u32 misc_ctrl_value;
 265         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 266         char char_buf[MAX_ASYNC_BUFFER_SIZE];
 267         bool drop_rts_on_tx_done;
 268
 269         struct  _input_signal_events    input_signal_events;
 270
 271         /* SPPP/Cisco HDLC device parts */
 272         int netcount;
 273         spinlock_t netlock;
 274
 275 #if SYNCLINK_GENERIC_HDLC
 276         struct net_device *netdev;
 277 #endif
 278
 279 } SLMP_INFO;
 280
 281 #define MGSL_MAGIC 0x5401
 282
 283 /*
 284  * define serial signal status change macros
 285  */
 286 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
 287 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
 288 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
 289 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
 290
 291 /* Common Register macros */
 292 #define LPR     0x00
 293 #define PABR0   0x02
 294 #define PABR1   0x03
 295 #define WCRL    0x04
 296 #define WCRM    0x05
 297 #define WCRH    0x06
 298 #define DPCR    0x08
 299 #define DMER    0x09
 300 #define ISR0    0x10
 301 #define ISR1    0x11
 302 #define ISR2    0x12
 303 #define IER0    0x14
 304 #define IER1    0x15
 305 #define IER2    0x16
 306 #define ITCR    0x18
 307 #define INTVR   0x1a
 308 #define IMVR    0x1c
 309
 310 /* MSCI Register macros */
 311 #define TRB     0x20
 312 #define TRBL    0x20
 313 #define TRBH    0x21
 314 #define SR0     0x22
 315 #define SR1     0x23
 316 #define SR2     0x24
 317 #define SR3     0x25
 318 #define FST     0x26
 319 #define IE0     0x28
 320 #define IE1     0x29
 321 #define IE2     0x2a
 322 #define FIE     0x2b
 323 #define CMD     0x2c
 324 #define MD0     0x2e
 325 #define MD1     0x2f
 326 #define MD2     0x30
 327 #define CTL     0x31
 328 #define SA0     0x32
 329 #define SA1     0x33
 330 #define IDL     0x34
 331 #define TMC     0x35
 332 #define RXS     0x36
 333 #define TXS     0x37
 334 #define TRC0    0x38
 335 #define TRC1    0x39
 336 #define RRC     0x3a
 337 #define CST0    0x3c
 338 #define CST1    0x3d
 339
 340 /* Timer Register Macros */
 341 #define TCNT    0x60
 342 #define TCNTL   0x60
 343 #define TCNTH   0x61
 344 #define TCONR   0x62
 345 #define TCONRL  0x62
 346 #define TCONRH  0x63
 347 #define TMCS    0x64
 348 #define TEPR    0x65
 349
 350 /* DMA Controller Register macros */
 351 #define DARL    0x80
 352 #define DARH    0x81
 353 #define DARB    0x82
 354 #define BAR     0x80
 355 #define BARL    0x80
 356 #define BARH    0x81
 357 #define BARB    0x82
 358 #define SAR     0x84
 359 #define SARL    0x84
 360 #define SARH    0x85
 361 #define SARB    0x86
 362 #define CPB     0x86
 363 #define CDA     0x88
 364 #define CDAL    0x88
 365 #define CDAH    0x89
 366 #define EDA     0x8a
 367 #define EDAL    0x8a
 368 #define EDAH    0x8b
 369 #define BFL     0x8c
 370 #define BFLL    0x8c
 371 #define BFLH    0x8d
 372 #define BCR     0x8e
 373 #define BCRL    0x8e
 374 #define BCRH    0x8f
 375 #define DSR     0x90
 376 #define DMR     0x91
 377 #define FCT     0x93
 378 #define DIR     0x94
 379 #define DCMD    0x95
 380
 381 /* combine with timer or DMA register address */
 382 #define TIMER0  0x00
 383 #define TIMER1  0x08
 384 #define TIMER2  0x10
 385 #define TIMER3  0x18
 386 #define RXDMA   0x00
 387 #define TXDMA   0x20
 388
 389 /* SCA Command Codes */
 390 #define NOOP            0x00
 391 #define TXRESET         0x01
 392 #define TXENABLE        0x02
 393 #define TXDISABLE       0x03
 394 #define TXCRCINIT       0x04
 395 #define TXCRCEXCL       0x05
 396 #define TXEOM           0x06
 397 #define TXABORT         0x07
 398 #define MPON            0x08
 399 #define TXBUFCLR        0x09
 400 #define RXRESET         0x11
 401 #define RXENABLE        0x12
 402 #define RXDISABLE       0x13
 403 #define RXCRCINIT       0x14
 404 #define RXREJECT        0x15
 405 #define SEARCHMP        0x16
 406 #define RXCRCEXCL       0x17
 407 #define RXCRCCALC       0x18
 408 #define CHRESET         0x21
 409 #define HUNT            0x31
 410
 411 /* DMA command codes */
 412 #define SWABORT         0x01
 413 #define FEICLEAR        0x02
 414
 415 /* IE0 */
 416 #define TXINTE          BIT7
 417 #define RXINTE          BIT6
 418 #define TXRDYE          BIT1
 419 #define RXRDYE          BIT0
 420
 421 /* IE1 & SR1 */
 422 #define UDRN    BIT7
 423 #define IDLE    BIT6
 424 #define SYNCD   BIT4
 425 #define FLGD    BIT4
 426 #define CCTS    BIT3
 427 #define CDCD    BIT2
 428 #define BRKD    BIT1
 429 #define ABTD    BIT1
 430 #define GAPD    BIT1
 431 #define BRKE    BIT0
 432 #define IDLD    BIT0
 433
 434 /* IE2 & SR2 */
 435 #define EOM     BIT7
 436 #define PMP     BIT6
 437 #define SHRT    BIT6
 438 #define PE      BIT5
 439 #define ABT     BIT5
 440 #define FRME    BIT4
 441 #define RBIT    BIT4
 442 #define OVRN    BIT3
 443 #define CRCE    BIT2
 444
 445
 446 /*
 447  * Global linked list of SyncLink devices
 448  */
 449 static SLMP_INFO *synclinkmp_device_list = NULL;
 450 static int synclinkmp_adapter_count = -1;
 451 static int synclinkmp_device_count = 0;
 452
 453 /*
 454  * Set this param to non-zero to load eax with the
 455  * .text section address and breakpoint on module load.
 456  * This is useful for use with gdb and add-symbol-file command.
 457  */
 458 static int break_on_load = 0;
 459
 460 /*
 461  * Driver major number, defaults to zero to get auto
 462  * assigned major number. May be forced as module parameter.
 463  */
 464 static int ttymajor = 0;
 465
 466 /*
 467  * Array of user specified options for ISA adapters.
 468  */
 469 static int debug_level = 0;
 470 static int maxframe[MAX_DEVICES] = {0,};
 471
 472 module_param(break_on_load, bool, 0);
 473 module_param(ttymajor, int, 0);
 474 module_param(debug_level, int, 0);
 475 module_param_array(maxframe, int, NULL, 0);
 476
 477 static char *driver_name = "SyncLink MultiPort driver";
 478 static char *driver_version = "$Revision: 4.38 $";
 479
 480 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 481 static void synclinkmp_remove_one(struct pci_dev *dev);
 482
 483 static struct pci_device_id synclinkmp_pci_tbl[] = {
 484         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
 485         { 0, }, /* terminate list */
 486 };
 487 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
 488
 489 MODULE_LICENSE("GPL");
 490
 491 static struct pci_driver synclinkmp_pci_driver = {
 492         .name           = "synclinkmp",
 493         .id_table       = synclinkmp_pci_tbl,
 494         .probe          = synclinkmp_init_one,
 495         .remove         = __devexit_p(synclinkmp_remove_one),
 496 };
 497
 498
 499 static struct tty_driver *serial_driver;
 500
 501 /* number of characters left in xmit buffer before we ask for more */
 502 #define WAKEUP_CHARS 256
 503
 504
 505 /* tty callbacks */
 506
 507 static int  open(struct tty_struct *tty, struct file * filp);
 508 static void close(struct tty_struct *tty, struct file * filp);
 509 static void hangup(struct tty_struct *tty);
 510 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 511
 512 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 513 static int put_char(struct tty_struct *tty, unsigned char ch);
 514 static void send_xchar(struct tty_struct *tty, char ch);
 515 static void wait_until_sent(struct tty_struct *tty, int timeout);
 516 static int  write_room(struct tty_struct *tty);
 517 static void flush_chars(struct tty_struct *tty);
 518 static void flush_buffer(struct tty_struct *tty);
 519 static void tx_hold(struct tty_struct *tty);
 520 static void tx_release(struct tty_struct *tty);
 521
 522 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
 523 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
 524 static int  chars_in_buffer(struct tty_struct *tty);
 525 static void throttle(struct tty_struct * tty);
 526 static void unthrottle(struct tty_struct * tty);
 527 static int set_break(struct tty_struct *tty, int break_state);
 528
 529 #if SYNCLINK_GENERIC_HDLC
 530 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 531 static void hdlcdev_tx_done(SLMP_INFO *info);
 532 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
 533 static int  hdlcdev_init(SLMP_INFO *info);
 534 static void hdlcdev_exit(SLMP_INFO *info);
 535 #endif
 536
 537 /* ioctl handlers */
 538
 539 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
 540 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 541 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 542 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
 543 static int  set_txidle(SLMP_INFO *info, int idle_mode);
 544 static int  tx_enable(SLMP_INFO *info, int enable);
 545 static int  tx_abort(SLMP_INFO *info);
 546 static int  rx_enable(SLMP_INFO *info, int enable);
 547 static int  modem_input_wait(SLMP_INFO *info,int arg);
 548 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
 549 static int  tiocmget(struct tty_struct *tty, struct file *file);
 550 static int  tiocmset(struct tty_struct *tty, struct file *file,
 551                      unsigned int set, unsigned int clear);
 552 static int  set_break(struct tty_struct *tty, int break_state);
 553
 554 static void add_device(SLMP_INFO *info);
 555 static void device_init(int adapter_num, struct pci_dev *pdev);
 556 static int  claim_resources(SLMP_INFO *info);
 557 static void release_resources(SLMP_INFO *info);
 558
 559 static int  startup(SLMP_INFO *info);
 560 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
 561 static void shutdown(SLMP_INFO *info);
 562 static void program_hw(SLMP_INFO *info);
 563 static void change_params(SLMP_INFO *info);
 564
 565 static bool init_adapter(SLMP_INFO *info);
 566 static bool register_test(SLMP_INFO *info);
 567 static bool irq_test(SLMP_INFO *info);
 568 static bool loopback_test(SLMP_INFO *info);
 569 static int  adapter_test(SLMP_INFO *info);
 570 static bool memory_test(SLMP_INFO *info);
 571
 572 static void reset_adapter(SLMP_INFO *info);
 573 static void reset_port(SLMP_INFO *info);
 574 static void async_mode(SLMP_INFO *info);
 575 static void hdlc_mode(SLMP_INFO *info);
 576
 577 static void rx_stop(SLMP_INFO *info);
 578 static void rx_start(SLMP_INFO *info);
 579 static void rx_reset_buffers(SLMP_INFO *info);
 580 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
 581 static bool rx_get_frame(SLMP_INFO *info);
 582
 583 static void tx_start(SLMP_INFO *info);
 584 static void tx_stop(SLMP_INFO *info);
 585 static void tx_load_fifo(SLMP_INFO *info);
 586 static void tx_set_idle(SLMP_INFO *info);
 587 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
 588
 589 static void get_signals(SLMP_INFO *info);
 590 static void set_signals(SLMP_INFO *info);
 591 static void enable_loopback(SLMP_INFO *info, int enable);
 592 static void set_rate(SLMP_INFO *info, u32 data_rate);
 593
 594 static int  bh_action(SLMP_INFO *info);
 595 static void bh_handler(struct work_struct *work);
 596 static void bh_receive(SLMP_INFO *info);
 597 static void bh_transmit(SLMP_INFO *info);
 598 static void bh_status(SLMP_INFO *info);
 599 static void isr_timer(SLMP_INFO *info);
 600 static void isr_rxint(SLMP_INFO *info);
 601 static void isr_rxrdy(SLMP_INFO *info);
 602 static void isr_txint(SLMP_INFO *info);
 603 static void isr_txrdy(SLMP_INFO *info);
 604 static void isr_rxdmaok(SLMP_INFO *info);
 605 static void isr_rxdmaerror(SLMP_INFO *info);
 606 static void isr_txdmaok(SLMP_INFO *info);
 607 static void isr_txdmaerror(SLMP_INFO *info);
 608 static void isr_io_pin(SLMP_INFO *info, u16 status);
 609
 610 static int  alloc_dma_bufs(SLMP_INFO *info);
 611 static void free_dma_bufs(SLMP_INFO *info);
 612 static int  alloc_buf_list(SLMP_INFO *info);
 613 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
 614 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
 615 static void free_tmp_rx_buf(SLMP_INFO *info);
 616
 617 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
 618 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
 619 static void tx_timeout(unsigned long context);
 620 static void status_timeout(unsigned long context);
 621
 622 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
 623 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
 624 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
 625 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
 626 static unsigned char read_status_reg(SLMP_INFO * info);
 627 static void write_control_reg(SLMP_INFO * info);
 628
 629
 630 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
 631 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
 632 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
 633
 634 static u32 misc_ctrl_value = 0x007e4040;
 635 static u32 lcr1_brdr_value = 0x00800028;
 636
 637 static u32 read_ahead_count = 8;
 638
 639 /* DPCR, DMA Priority Control
 640  *
 641  * 07..05  Not used, must be 0
 642  * 04      BRC, bus release condition: 0=all transfers complete
 643  *              1=release after 1 xfer on all channels
 644  * 03      CCC, channel change condition: 0=every cycle
 645  *              1=after each channel completes all xfers
 646  * 02..00  PR<2..0>, priority 100=round robin
 647  *
 648  * 00000100 = 0x00
 649  */
 650 static unsigned char dma_priority = 0x04;
 651
 652 // Number of bytes that can be written to shared RAM
 653 // in a single write operation
 654 static u32 sca_pci_load_interval = 64;
 655
 656 /*
 657  * 1st function defined in .text section. Calling this function in
 658  * init_module() followed by a breakpoint allows a remote debugger
 659  * (gdb) to get the .text address for the add-symbol-file command.
 660  * This allows remote debugging of dynamically loadable modules.
 661  */
 662 static void* synclinkmp_get_text_ptr(void);
 663 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
 664
 665 static inline int sanity_check(SLMP_INFO *info,
 666                                char *name, const char *routine)
 667 {
 668 #ifdef SANITY_CHECK
 669         static const char *badmagic =
 670                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
 671         static const char *badinfo =
 672                 "Warning: null synclinkmp_struct for (%s) in %s\n";
 673
 674         if (!info) {
 675                 printk(badinfo, name, routine);
 676                 return 1;
 677         }
 678         if (info->magic != MGSL_MAGIC) {
 679                 printk(badmagic, name, routine);
 680                 return 1;
 681         }
 682 #else
 683         if (!info)
 684                 return 1;
 685 #endif
 686         return 0;
 687 }
 688
 689 /**
 690  * line discipline callback wrappers
 691  *
 692  * The wrappers maintain line discipline references
 693  * while calling into the line discipline.
 694  *
 695  * ldisc_receive_buf  - pass receive data to line discipline
 696  */
 697
 698 static void ldisc_receive_buf(struct tty_struct *tty,
 699                               const __u8 *data, char *flags, int count)
 700 {
 701         struct tty_ldisc *ld;
 702         if (!tty)
 703                 return;
 704         ld = tty_ldisc_ref(tty);
 705         if (ld) {
 706                 if (ld->ops->receive_buf)
 707                         ld->ops->receive_buf(tty, data, flags, count);
 708                 tty_ldisc_deref(ld);
 709         }
 710 }
 711
 712 /* tty callbacks */
 713
 714 /* Called when a port is opened.  Init and enable port.
 715  */
 716 static int open(struct tty_struct *tty, struct file *filp)
 717 {
 718         SLMP_INFO *info;
 719         int retval, line;
 720         unsigned long flags;
 721
 722         line = tty->index;
 723         if ((line < 0) || (line >= synclinkmp_device_count)) {
 724                 printk("%s(%d): open with invalid line #%d.\n",
 725                         __FILE__,__LINE__,line);
 726                 return -ENODEV;
 727         }
 728
 729         info = synclinkmp_device_list;
 730         while(info && info->line != line)
 731                 info = info->next_device;
 732         if (sanity_check(info, tty->name, "open"))
 733                 return -ENODEV;
 734         if ( info->init_error ) {
 735                 printk("%s(%d):%s device is not allocated, init error=%d\n",
 736                         __FILE__,__LINE__,info->device_name,info->init_error);
 737                 return -ENODEV;
 738         }
 739
 740         tty->driver_data = info;
 741         info->port.tty = tty;
 742
 743         if (debug_level >= DEBUG_LEVEL_INFO)
 744                 printk("%s(%d):%s open(), old ref count = %d\n",
 745                          __FILE__,__LINE__,tty->driver->name, info->port.count);
 746
 747         /* If port is closing, signal caller to try again */
 748         if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
 749                 if (info->port.flags & ASYNC_CLOSING)
 750                         interruptible_sleep_on(&info->port.close_wait);
 751                 retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
 752                         -EAGAIN : -ERESTARTSYS);
 753                 goto cleanup;
 754         }
 755
 756         info->port.tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 757
 758         spin_lock_irqsave(&info->netlock, flags);
 759         if (info->netcount) {
 760                 retval = -EBUSY;
 761                 spin_unlock_irqrestore(&info->netlock, flags);
 762                 goto cleanup;
 763         }
 764         info->port.count++;
 765         spin_unlock_irqrestore(&info->netlock, flags);
 766
 767         if (info->port.count == 1) {
 768                 /* 1st open on this device, init hardware */
 769                 retval = startup(info);
 770                 if (retval < 0)
 771                         goto cleanup;
 772         }
 773
 774         retval = block_til_ready(tty, filp, info);
 775         if (retval) {
 776                 if (debug_level >= DEBUG_LEVEL_INFO)
 777                         printk("%s(%d):%s block_til_ready() returned %d\n",
 778                                  __FILE__,__LINE__, info->device_name, retval);
 779                 goto cleanup;
 780         }
 781
 782         if (debug_level >= DEBUG_LEVEL_INFO)
 783                 printk("%s(%d):%s open() success\n",
 784                          __FILE__,__LINE__, info->device_name);
 785         retval = 0;
 786
 787 cleanup:
 788         if (retval) {
 789                 if (tty->count == 1)
 790                         info->port.tty = NULL; /* tty layer will release tty struct */
 791                 if(info->port.count)
 792                         info->port.count--;
 793         }
 794
 795         return retval;
 796 }
 797
 798 /* Called when port is closed. Wait for remaining data to be
 799  * sent. Disable port and free resources.
 800  */
 801 static void close(struct tty_struct *tty, struct file *filp)
 802 {
 803         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
 804
 805         if (sanity_check(info, tty->name, "close"))
 806                 return;
 807
 808         if (debug_level >= DEBUG_LEVEL_INFO)
 809                 printk("%s(%d):%s close() entry, count=%d\n",
 810                          __FILE__,__LINE__, info->device_name, info->port.count);
 811
 812         if (!info->port.count)
 813                 return;
 814
 815         if (tty_hung_up_p(filp))
 816                 goto cleanup;
 817
 818         if ((tty->count == 1) && (info->port.count != 1)) {
 819                 /*
 820                  * tty->count is 1 and the tty structure will be freed.
 821                  * info->port.count should be one in this case.
 822                  * if it's not, correct it so that the port is shutdown.
 823                  */
 824                 printk("%s(%d):%s close: bad refcount; tty->count is 1, "
 825                        "info->port.count is %d\n",
 826                          __FILE__,__LINE__, info->device_name, info->port.count);
 827                 info->port.count = 1;
 828         }
 829
 830         info->port.count--;
 831
 832         /* if at least one open remaining, leave hardware active */
 833         if (info->port.count)
 834                 goto cleanup;
 835
 836         info->port.flags |= ASYNC_CLOSING;
 837
 838         /* set tty->closing to notify line discipline to
 839          * only process XON/XOFF characters. Only the N_TTY
 840          * discipline appears to use this (ppp does not).
 841          */
 842         tty->closing = 1;
 843
 844         /* wait for transmit data to clear all layers */
 845
 846         if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
 847                 if (debug_level >= DEBUG_LEVEL_INFO)
 848                         printk("%s(%d):%s close() calling tty_wait_until_sent\n",
 849                                  __FILE__,__LINE__, info->device_name );
 850                 tty_wait_until_sent(tty, info->port.closing_wait);
 851         }
 852
 853         if (info->port.flags & ASYNC_INITIALIZED)
 854                 wait_until_sent(tty, info->timeout);
 855
 856         flush_buffer(tty);
 857
 858         tty_ldisc_flush(tty);
 859
 860         shutdown(info);
 861
 862         tty->closing = 0;
 863         info->port.tty = NULL;
 864
 865         if (info->port.blocked_open) {
 866                 if (info->port.close_delay) {
 867                         msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
 868                 }
 869                 wake_up_interruptible(&info->port.open_wait);
 870         }
 871
 872         info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 873
 874         wake_up_interruptible(&info->port.close_wait);
 875
 876 cleanup:
 877         if (debug_level >= DEBUG_LEVEL_INFO)
 878                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
 879                         tty->driver->name, info->port.count);
 880 }
 881
 882 /* Called by tty_hangup() when a hangup is signaled.
 883  * This is the same as closing all open descriptors for the port.
 884  */
 885 static void hangup(struct tty_struct *tty)
 886 {
 887         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 888
 889         if (debug_level >= DEBUG_LEVEL_INFO)
 890                 printk("%s(%d):%s hangup()\n",
 891                          __FILE__,__LINE__, info->device_name );
 892
 893         if (sanity_check(info, tty->name, "hangup"))
 894                 return;
 895
 896         flush_buffer(tty);
 897         shutdown(info);
 898
 899         info->port.count = 0;
 900         info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
 901         info->port.tty = NULL;
 902
 903         wake_up_interruptible(&info->port.open_wait);
 904 }
 905
 906 /* Set new termios settings
 907  */
 908 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 909 {
 910         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 911         unsigned long flags;
 912
 913         if (debug_level >= DEBUG_LEVEL_INFO)
 914                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
 915                         tty->driver->name );
 916
 917         change_params(info);
 918
 919         /* Handle transition to B0 status */
 920         if (old_termios->c_cflag & CBAUD &&
 921             !(tty->termios->c_cflag & CBAUD)) {
 922                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
 923                 spin_lock_irqsave(&info->lock,flags);
 924                 set_signals(info);
 925                 spin_unlock_irqrestore(&info->lock,flags);
 926         }
 927
 928         /* Handle transition away from B0 status */
 929         if (!(old_termios->c_cflag & CBAUD) &&
 930             tty->termios->c_cflag & CBAUD) {
 931                 info->serial_signals |= SerialSignal_DTR;
 932                 if (!(tty->termios->c_cflag & CRTSCTS) ||
 933                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 934                         info->serial_signals |= SerialSignal_RTS;
 935                 }
 936                 spin_lock_irqsave(&info->lock,flags);
 937                 set_signals(info);
 938                 spin_unlock_irqrestore(&info->lock,flags);
 939         }
 940
 941         /* Handle turning off CRTSCTS */
 942         if (old_termios->c_cflag & CRTSCTS &&
 943             !(tty->termios->c_cflag & CRTSCTS)) {
 944                 tty->hw_stopped = 0;
 945                 tx_release(tty);
 946         }
 947 }
 948
 949 /* Send a block of data
 950  *
 951  * Arguments:
 952  *
 953  *      tty             pointer to tty information structure
 954  *      buf             pointer to buffer containing send data
 955  *      count           size of send data in bytes
 956  *
 957  * Return Value:        number of characters written
 958  */
 959 static int write(struct tty_struct *tty,
 960                  const unsigned char *buf, int count)
 961 {
 962         int     c, ret = 0;
 963         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 964         unsigned long flags;
 965
 966         if (debug_level >= DEBUG_LEVEL_INFO)
 967                 printk("%s(%d):%s write() count=%d\n",
 968                        __FILE__,__LINE__,info->device_name,count);
 969
 970         if (sanity_check(info, tty->name, "write"))
 971                 goto cleanup;
 972
 973         if (!info->tx_buf)
 974                 goto cleanup;
 975
 976         if (info->params.mode == MGSL_MODE_HDLC) {
 977                 if (count > info->max_frame_size) {
 978                         ret = -EIO;
 979                         goto cleanup;
 980                 }
 981                 if (info->tx_active)
 982                         goto cleanup;
 983                 if (info->tx_count) {
 984                         /* send accumulated data from send_char() calls */
 985                         /* as frame and wait before accepting more data. */
 986                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
 987                         goto start;
 988                 }
 989                 ret = info->tx_count = count;
 990                 tx_load_dma_buffer(info, buf, count);
 991                 goto start;
 992         }
 993
 994         for (;;) {
 995                 c = min_t(int, count,
 996                         min(info->max_frame_size - info->tx_count - 1,
 997                             info->max_frame_size - info->tx_put));
 998                 if (c <= 0)
 999                         break;
1000
1001                 memcpy(info->tx_buf + info->tx_put, buf, c);
1002
1003                 spin_lock_irqsave(&info->lock,flags);
1004                 info->tx_put += c;
1005                 if (info->tx_put >= info->max_frame_size)
1006                         info->tx_put -= info->max_frame_size;
1007                 info->tx_count += c;
1008                 spin_unlock_irqrestore(&info->lock,flags);
1009
1010                 buf += c;
1011                 count -= c;
1012                 ret += c;
1013         }
1014
1015         if (info->params.mode == MGSL_MODE_HDLC) {
1016                 if (count) {
1017                         ret = info->tx_count = 0;
1018                         goto cleanup;
1019                 }
1020                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1021         }
1022 start:
1023         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1024                 spin_lock_irqsave(&info->lock,flags);
1025                 if (!info->tx_active)
1026                         tx_start(info);
1027                 spin_unlock_irqrestore(&info->lock,flags);
1028         }
1029
1030 cleanup:
1031         if (debug_level >= DEBUG_LEVEL_INFO)
1032                 printk( "%s(%d):%s write() returning=%d\n",
1033                         __FILE__,__LINE__,info->device_name,ret);
1034         return ret;
1035 }
1036
1037 /* Add a character to the transmit buffer.
1038  */
1039 static int put_char(struct tty_struct *tty, unsigned char ch)
1040 {
1041         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1042         unsigned long flags;
1043         int ret = 0;
1044
1045         if ( debug_level >= DEBUG_LEVEL_INFO ) {
1046                 printk( "%s(%d):%s put_char(%d)\n",
1047                         __FILE__,__LINE__,info->device_name,ch);
1048         }
1049
1050         if (sanity_check(info, tty->name, "put_char"))
1051                 return 0;
1052
1053         if (!info->tx_buf)
1054                 return 0;
1055
1056         spin_lock_irqsave(&info->lock,flags);
1057
1058         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1059              !info->tx_active ) {
1060
1061                 if (info->tx_count < info->max_frame_size - 1) {
1062                         info->tx_buf[info->tx_put++] = ch;
1063                         if (info->tx_put >= info->max_frame_size)
1064                                 info->tx_put -= info->max_frame_size;
1065                         info->tx_count++;
1066                         ret = 1;
1067                 }
1068         }
1069
1070         spin_unlock_irqrestore(&info->lock,flags);
1071         return ret;
1072 }
1073
1074 /* Send a high-priority XON/XOFF character
1075  */
1076 static void send_xchar(struct tty_struct *tty, char ch)
1077 {
1078         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1079         unsigned long flags;
1080
1081         if (debug_level >= DEBUG_LEVEL_INFO)
1082                 printk("%s(%d):%s send_xchar(%d)\n",
1083                          __FILE__,__LINE__, info->device_name, ch );
1084
1085         if (sanity_check(info, tty->name, "send_xchar"))
1086                 return;
1087
1088         info->x_char = ch;
1089         if (ch) {
1090                 /* Make sure transmit interrupts are on */
1091                 spin_lock_irqsave(&info->lock,flags);
1092                 if (!info->tx_enabled)
1093                         tx_start(info);
1094                 spin_unlock_irqrestore(&info->lock,flags);
1095         }
1096 }
1097
1098 /* Wait until the transmitter is empty.
1099  */
1100 static void wait_until_sent(struct tty_struct *tty, int timeout)
1101 {
1102         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1103         unsigned long orig_jiffies, char_time;
1104
1105         if (!info )
1106                 return;
1107
1108         if (debug_level >= DEBUG_LEVEL_INFO)
1109                 printk("%s(%d):%s wait_until_sent() entry\n",
1110                          __FILE__,__LINE__, info->device_name );
1111
1112         if (sanity_check(info, tty->name, "wait_until_sent"))
1113                 return;
1114
1115         lock_kernel();
1116
1117         if (!(info->port.flags & ASYNC_INITIALIZED))
1118                 goto exit;
1119
1120         orig_jiffies = jiffies;
1121
1122         /* Set check interval to 1/5 of estimated time to
1123          * send a character, and make it at least 1. The check
1124          * interval should also be less than the timeout.
1125          * Note: use tight timings here to satisfy the NIST-PCTS.
1126          */
1127
1128         if ( info->params.data_rate ) {
1129                 char_time = info->timeout/(32 * 5);
1130                 if (!char_time)
1131                         char_time++;
1132         } else
1133                 char_time = 1;
1134
1135         if (timeout)
1136                 char_time = min_t(unsigned long, char_time, timeout);
1137
1138         if ( info->params.mode == MGSL_MODE_HDLC ) {
1139                 while (info->tx_active) {
1140                         msleep_interruptible(jiffies_to_msecs(char_time));
1141                         if (signal_pending(current))
1142                                 break;
1143                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1144                                 break;
1145                 }
1146         } else {
1147                 //TODO: determine if there is something similar to USC16C32
1148                 //      TXSTATUS_ALL_SENT status
1149                 while ( info->tx_active && info->tx_enabled) {
1150                         msleep_interruptible(jiffies_to_msecs(char_time));
1151                         if (signal_pending(current))
1152                                 break;
1153                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1154                                 break;
1155                 }
1156         }
1157
1158 exit:
1159         unlock_kernel();
1160         if (debug_level >= DEBUG_LEVEL_INFO)
1161                 printk("%s(%d):%s wait_until_sent() exit\n",
1162                          __FILE__,__LINE__, info->device_name );
1163 }
1164
1165 /* Return the count of free bytes in transmit buffer
1166  */
1167 static int write_room(struct tty_struct *tty)
1168 {
1169         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1170         int ret;
1171
1172         if (sanity_check(info, tty->name, "write_room"))
1173                 return 0;
1174
1175         lock_kernel();
1176         if (info->params.mode == MGSL_MODE_HDLC) {
1177                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1178         } else {
1179                 ret = info->max_frame_size - info->tx_count - 1;
1180                 if (ret < 0)
1181                         ret = 0;
1182         }
1183         unlock_kernel();
1184
1185         if (debug_level >= DEBUG_LEVEL_INFO)
1186                 printk("%s(%d):%s write_room()=%d\n",
1187                        __FILE__, __LINE__, info->device_name, ret);
1188
1189         return ret;
1190 }
1191
1192 /* enable transmitter and send remaining buffered characters
1193  */
1194 static void flush_chars(struct tty_struct *tty)
1195 {
1196         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1197         unsigned long flags;
1198
1199         if ( debug_level >= DEBUG_LEVEL_INFO )
1200                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1201                         __FILE__,__LINE__,info->device_name,info->tx_count);
1202
1203         if (sanity_check(info, tty->name, "flush_chars"))
1204                 return;
1205
1206         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1207             !info->tx_buf)
1208                 return;
1209
1210         if ( debug_level >= DEBUG_LEVEL_INFO )
1211                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1212                         __FILE__,__LINE__,info->device_name );
1213
1214         spin_lock_irqsave(&info->lock,flags);
1215
1216         if (!info->tx_active) {
1217                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1218                         info->tx_count ) {
1219                         /* operating in synchronous (frame oriented) mode */
1220                         /* copy data from circular tx_buf to */
1221                         /* transmit DMA buffer. */
1222                         tx_load_dma_buffer(info,
1223                                  info->tx_buf,info->tx_count);
1224                 }
1225                 tx_start(info);
1226         }
1227
1228         spin_unlock_irqrestore(&info->lock,flags);
1229 }
1230
1231 /* Discard all data in the send buffer
1232  */
1233 static void flush_buffer(struct tty_struct *tty)
1234 {
1235         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1236         unsigned long flags;
1237
1238         if (debug_level >= DEBUG_LEVEL_INFO)
1239                 printk("%s(%d):%s flush_buffer() entry\n",
1240                          __FILE__,__LINE__, info->device_name );
1241
1242         if (sanity_check(info, tty->name, "flush_buffer"))
1243                 return;
1244
1245         spin_lock_irqsave(&info->lock,flags);
1246         info->tx_count = info->tx_put = info->tx_get = 0;
1247         del_timer(&info->tx_timer);
1248         spin_unlock_irqrestore(&info->lock,flags);
1249
1250         tty_wakeup(tty);
1251 }
1252
1253 /* throttle (stop) transmitter
1254  */
1255 static void tx_hold(struct tty_struct *tty)
1256 {
1257         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1258         unsigned long flags;
1259
1260         if (sanity_check(info, tty->name, "tx_hold"))
1261                 return;
1262
1263         if ( debug_level >= DEBUG_LEVEL_INFO )
1264                 printk("%s(%d):%s tx_hold()\n",
1265                         __FILE__,__LINE__,info->device_name);
1266
1267         spin_lock_irqsave(&info->lock,flags);
1268         if (info->tx_enabled)
1269                 tx_stop(info);
1270         spin_unlock_irqrestore(&info->lock,flags);
1271 }
1272
1273 /* release (start) transmitter
1274  */
1275 static void tx_release(struct tty_struct *tty)
1276 {
1277         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1278         unsigned long flags;
1279
1280         if (sanity_check(info, tty->name, "tx_release"))
1281                 return;
1282
1283         if ( debug_level >= DEBUG_LEVEL_INFO )
1284                 printk("%s(%d):%s tx_release()\n",
1285                         __FILE__,__LINE__,info->device_name);
1286
1287         spin_lock_irqsave(&info->lock,flags);
1288         if (!info->tx_enabled)
1289                 tx_start(info);
1290         spin_unlock_irqrestore(&info->lock,flags);
1291 }
1292
1293 /* Service an IOCTL request
1294  *
1295  * Arguments:
1296  *
1297  *      tty     pointer to tty instance data
1298  *      file    pointer to associated file object for device
1299  *      cmd     IOCTL command code
1300  *      arg     command argument/context
1301  *
1302  * Return Value:        0 if success, otherwise error code
1303  */
1304 static int do_ioctl(struct tty_struct *tty, struct file *file,
1305                  unsigned int cmd, unsigned long arg)
1306 {
1307         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1308         int error;
1309         struct mgsl_icount cnow;        /* kernel counter temps */
1310         struct serial_icounter_struct __user *p_cuser;  /* user space */
1311         unsigned long flags;
1312         void __user *argp = (void __user *)arg;
1313
1314         if (debug_level >= DEBUG_LEVEL_INFO)
1315                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1316                         info->device_name, cmd );
1317
1318         if (sanity_check(info, tty->name, "ioctl"))
1319                 return -ENODEV;
1320
1321         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1322             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1323                 if (tty->flags & (1 << TTY_IO_ERROR))
1324                     return -EIO;
1325         }
1326
1327         switch (cmd) {
1328         case MGSL_IOCGPARAMS:
1329                 return get_params(info, argp);
1330         case MGSL_IOCSPARAMS:
1331                 return set_params(info, argp);
1332         case MGSL_IOCGTXIDLE:
1333                 return get_txidle(info, argp);
1334         case MGSL_IOCSTXIDLE:
1335                 return set_txidle(info, (int)arg);
1336         case MGSL_IOCTXENABLE:
1337                 return tx_enable(info, (int)arg);
1338         case MGSL_IOCRXENABLE:
1339                 return rx_enable(info, (int)arg);
1340         case MGSL_IOCTXABORT:
1341                 return tx_abort(info);
1342         case MGSL_IOCGSTATS:
1343                 return get_stats(info, argp);
1344         case MGSL_IOCWAITEVENT:
1345                 return wait_mgsl_event(info, argp);
1346         case MGSL_IOCLOOPTXDONE:
1347                 return 0; // TODO: Not supported, need to document
1348                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1349                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1350                  */
1351         case TIOCMIWAIT:
1352                 return modem_input_wait(info,(int)arg);
1353
1354                 /*
1355                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1356                  * Return: write counters to the user passed counter struct
1357                  * NB: both 1->0 and 0->1 transitions are counted except for
1358                  *     RI where only 0->1 is counted.
1359                  */
1360         case TIOCGICOUNT:
1361                 spin_lock_irqsave(&info->lock,flags);
1362                 cnow = info->icount;
1363                 spin_unlock_irqrestore(&info->lock,flags);
1364                 p_cuser = argp;
1365                 PUT_USER(error,cnow.cts, &p_cuser->cts);
1366                 if (error) return error;
1367                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
1368                 if (error) return error;
1369                 PUT_USER(error,cnow.rng, &p_cuser->rng);
1370                 if (error) return error;
1371                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
1372                 if (error) return error;
1373                 PUT_USER(error,cnow.rx, &p_cuser->rx);
1374                 if (error) return error;
1375                 PUT_USER(error,cnow.tx, &p_cuser->tx);
1376                 if (error) return error;
1377                 PUT_USER(error,cnow.frame, &p_cuser->frame);
1378                 if (error) return error;
1379                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
1380                 if (error) return error;
1381                 PUT_USER(error,cnow.parity, &p_cuser->parity);
1382                 if (error) return error;
1383                 PUT_USER(error,cnow.brk, &p_cuser->brk);
1384                 if (error) return error;
1385                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
1386                 if (error) return error;
1387                 return 0;
1388         default:
1389                 return -ENOIOCTLCMD;
1390         }
1391         return 0;
1392 }
1393
1394 static int ioctl(struct tty_struct *tty, struct file *file,
1395                  unsigned int cmd, unsigned long arg)
1396 {
1397         int ret;
1398         lock_kernel();
1399         ret = do_ioctl(tty, file, cmd, arg);
1400         unlock_kernel();
1401         return ret;
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 static 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 int 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 -EINVAL;
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         return 0;
1609 }
1610
1611 #if SYNCLINK_GENERIC_HDLC
1612
1613 /**
1614  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1615  * set encoding and frame check sequence (FCS) options
1616  *
1617  * dev       pointer to network device structure
1618  * encoding  serial encoding setting
1619  * parity    FCS setting
1620  *
1621  * returns 0 if success, otherwise error code
1622  */
1623 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1624                           unsigned short parity)
1625 {
1626         SLMP_INFO *info = dev_to_port(dev);
1627         unsigned char  new_encoding;
1628         unsigned short new_crctype;
1629
1630         /* return error if TTY interface open */
1631         if (info->port.count)
1632                 return -EBUSY;
1633
1634         switch (encoding)
1635         {
1636         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1637         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1638         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1639         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1640         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1641         default: return -EINVAL;
1642         }
1643
1644         switch (parity)
1645         {
1646         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1647         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1648         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1649         default: return -EINVAL;
1650         }
1651
1652         info->params.encoding = new_encoding;
1653         info->params.crc_type = new_crctype;
1654
1655         /* if network interface up, reprogram hardware */
1656         if (info->netcount)
1657                 program_hw(info);
1658
1659         return 0;
1660 }
1661
1662 /**
1663  * called by generic HDLC layer to send frame
1664  *
1665  * skb  socket buffer containing HDLC frame
1666  * dev  pointer to network device structure
1667  *
1668  * returns 0 if success, otherwise error code
1669  */
1670 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1671 {
1672         SLMP_INFO *info = dev_to_port(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         dev->stats.tx_packets++;
1687         dev->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->port.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->port.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         unsigned long flags;
1904
1905         if (debug_level >= DEBUG_LEVEL_INFO)
1906                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1907
1908         dev->stats.tx_errors++;
1909         dev->stats.tx_aborted_errors++;
1910
1911         spin_lock_irqsave(&info->lock,flags);
1912         tx_stop(info);
1913         spin_unlock_irqrestore(&info->lock,flags);
1914
1915         netif_wake_queue(dev);
1916 }
1917
1918 /**
1919  * called by device driver when transmit completes
1920  * reenable network layer transmit if stopped
1921  *
1922  * info  pointer to device instance information
1923  */
1924 static void hdlcdev_tx_done(SLMP_INFO *info)
1925 {
1926         if (netif_queue_stopped(info->netdev))
1927                 netif_wake_queue(info->netdev);
1928 }
1929
1930 /**
1931  * called by device driver when frame received
1932  * pass frame to network layer
1933  *
1934  * info  pointer to device instance information
1935  * buf   pointer to buffer contianing frame data
1936  * size  count of data bytes in buf
1937  */
1938 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1939 {
1940         struct sk_buff *skb = dev_alloc_skb(size);
1941         struct net_device *dev = info->netdev;
1942
1943         if (debug_level >= DEBUG_LEVEL_INFO)
1944                 printk("hdlcdev_rx(%s)\n",dev->name);
1945
1946         if (skb == NULL) {
1947                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n",
1948                        dev->name);
1949                 dev->stats.rx_dropped++;
1950                 return;
1951         }
1952
1953         memcpy(skb_put(skb, size), buf, size);
1954
1955         skb->protocol = hdlc_type_trans(skb, dev);
1956
1957         dev->stats.rx_packets++;
1958         dev->stats.rx_bytes += size;
1959
1960         netif_rx(skb);
1961
1962         dev->last_rx = jiffies;
1963 }
1964
1965 /**
1966  * called by device driver when adding device instance
1967  * do generic HDLC initialization
1968  *
1969  * info  pointer to device instance information
1970  *
1971  * returns 0 if success, otherwise error code
1972  */
1973 static int hdlcdev_init(SLMP_INFO *info)
1974 {
1975         int rc;
1976         struct net_device *dev;
1977         hdlc_device *hdlc;
1978
1979         /* allocate and initialize network and HDLC layer objects */
1980
1981         if (!(dev = alloc_hdlcdev(info))) {
1982                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1983                 return -ENOMEM;
1984         }
1985
1986         /* for network layer reporting purposes only */
1987         dev->mem_start = info->phys_sca_base;
1988         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1989         dev->irq       = info->irq_level;
1990
1991         /* network layer callbacks and settings */
1992         dev->do_ioctl       = hdlcdev_ioctl;
1993         dev->open           = hdlcdev_open;
1994         dev->stop           = hdlcdev_close;
1995         dev->tx_timeout     = hdlcdev_tx_timeout;
1996         dev->watchdog_timeo = 10*HZ;
1997         dev->tx_queue_len   = 50;
1998
1999         /* generic HDLC layer callbacks and settings */
2000         hdlc         = dev_to_hdlc(dev);
2001         hdlc->attach = hdlcdev_attach;
2002         hdlc->xmit   = hdlcdev_xmit;
2003
2004         /* register objects with HDLC layer */
2005         if ((rc = register_hdlc_device(dev))) {
2006                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
2007                 free_netdev(dev);
2008                 return rc;
2009         }
2010
2011         info->netdev = dev;
2012         return 0;
2013 }
2014
2015 /**
2016  * called by device driver when removing device instance
2017  * do generic HDLC cleanup
2018  *
2019  * info  pointer to device instance information
2020  */
2021 static void hdlcdev_exit(SLMP_INFO *info)
2022 {
2023         unregister_hdlc_device(info->netdev);
2024         free_netdev(info->netdev);
2025         info->netdev = NULL;
2026 }
2027
2028 #endif /* CONFIG_HDLC */
2029
2030
2031 /* Return next bottom half action to perform.
2032  * Return Value:        BH action code or 0 if nothing to do.
2033  */
2034 static int bh_action(SLMP_INFO *info)
2035 {
2036         unsigned long flags;
2037         int rc = 0;
2038
2039         spin_lock_irqsave(&info->lock,flags);
2040
2041         if (info->pending_bh & BH_RECEIVE) {
2042                 info->pending_bh &= ~BH_RECEIVE;
2043                 rc = BH_RECEIVE;
2044         } else if (info->pending_bh & BH_TRANSMIT) {
2045                 info->pending_bh &= ~BH_TRANSMIT;
2046                 rc = BH_TRANSMIT;
2047         } else if (info->pending_bh & BH_STATUS) {
2048                 info->pending_bh &= ~BH_STATUS;
2049                 rc = BH_STATUS;
2050         }
2051
2052         if (!rc) {
2053                 /* Mark BH routine as complete */
2054                 info->bh_running = false;
2055                 info->bh_requested = false;
2056         }
2057
2058         spin_unlock_irqrestore(&info->lock,flags);
2059
2060         return rc;
2061 }
2062
2063 /* Perform bottom half processing of work items queued by ISR.
2064  */
2065 static void bh_handler(struct work_struct *work)
2066 {
2067         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2068         int action;
2069
2070         if (!info)
2071                 return;
2072
2073         if ( debug_level >= DEBUG_LEVEL_BH )
2074                 printk( "%s(%d):%s bh_handler() entry\n",
2075                         __FILE__,__LINE__,info->device_name);
2076
2077         info->bh_running = true;
2078
2079         while((action = bh_action(info)) != 0) {
2080
2081                 /* Process work item */
2082                 if ( debug_level >= DEBUG_LEVEL_BH )
2083                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2084                                 __FILE__,__LINE__,info->device_name, action);
2085
2086                 switch (action) {
2087
2088                 case BH_RECEIVE:
2089                         bh_receive(info);
2090                         break;
2091                 case BH_TRANSMIT:
2092                         bh_transmit(info);
2093                         break;
2094                 case BH_STATUS:
2095                         bh_status(info);
2096                         break;
2097                 default:
2098                         /* unknown work item ID */
2099                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2100                                 __FILE__,__LINE__,info->device_name,action);
2101                         break;
2102                 }
2103         }
2104
2105         if ( debug_level >= DEBUG_LEVEL_BH )
2106                 printk( "%s(%d):%s bh_handler() exit\n",
2107                         __FILE__,__LINE__,info->device_name);
2108 }
2109
2110 static void bh_receive(SLMP_INFO *info)
2111 {
2112         if ( debug_level >= DEBUG_LEVEL_BH )
2113                 printk( "%s(%d):%s bh_receive()\n",
2114                         __FILE__,__LINE__,info->device_name);
2115
2116         while( rx_get_frame(info) );
2117 }
2118
2119 static void bh_transmit(SLMP_INFO *info)
2120 {
2121         struct tty_struct *tty = info->port.tty;
2122
2123         if ( debug_level >= DEBUG_LEVEL_BH )
2124                 printk( "%s(%d):%s bh_transmit() entry\n",
2125                         __FILE__,__LINE__,info->device_name);
2126
2127         if (tty)
2128                 tty_wakeup(tty);
2129 }
2130
2131 static void bh_status(SLMP_INFO *info)
2132 {
2133         if ( debug_level >= DEBUG_LEVEL_BH )
2134                 printk( "%s(%d):%s bh_status() entry\n",
2135                         __FILE__,__LINE__,info->device_name);
2136
2137         info->ri_chkcount = 0;
2138         info->dsr_chkcount = 0;
2139         info->dcd_chkcount = 0;
2140         info->cts_chkcount = 0;
2141 }
2142
2143 static void isr_timer(SLMP_INFO * info)
2144 {
2145         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2146
2147         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2148         write_reg(info, IER2, 0);
2149
2150         /* TMCS, Timer Control/Status Register
2151          *
2152          * 07      CMF, Compare match flag (read only) 1=match
2153          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2154          * 05      Reserved, must be 0
2155          * 04      TME, Timer Enable
2156          * 03..00  Reserved, must be 0
2157          *
2158          * 0000 0000
2159          */
2160         write_reg(info, (unsigned char)(timer + TMCS), 0);
2161
2162         info->irq_occurred = true;
2163
2164         if ( debug_level >= DEBUG_LEVEL_ISR )
2165                 printk("%s(%d):%s isr_timer()\n",
2166                         __FILE__,__LINE__,info->device_name);
2167 }
2168
2169 static void isr_rxint(SLMP_INFO * info)
2170 {
2171         struct tty_struct *tty = info->port.tty;
2172         struct  mgsl_icount *icount = &info->icount;
2173         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2174         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2175
2176         /* clear status bits */
2177         if (status)
2178                 write_reg(info, SR1, status);
2179
2180         if (status2)
2181                 write_reg(info, SR2, status2);
2182
2183         if ( debug_level >= DEBUG_LEVEL_ISR )
2184                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2185                         __FILE__,__LINE__,info->device_name,status,status2);
2186
2187         if (info->params.mode == MGSL_MODE_ASYNC) {
2188                 if (status & BRKD) {
2189                         icount->brk++;
2190
2191                         /* process break detection if tty control
2192                          * is not set to ignore it
2193                          */
2194                         if ( tty ) {
2195                                 if (!(status & info->ignore_status_mask1)) {
2196                                         if (info->read_status_mask1 & BRKD) {
2197                                                 tty_insert_flip_char(tty, 0, TTY_BREAK);
2198                                                 if (info->port.flags & ASYNC_SAK)
2199                                                         do_SAK(tty);
2200                                         }
2201                                 }
2202                         }
2203                 }
2204         }
2205         else {
2206                 if (status & (FLGD|IDLD)) {
2207                         if (status & FLGD)
2208                                 info->icount.exithunt++;
2209                         else if (status & IDLD)
2210                                 info->icount.rxidle++;
2211                         wake_up_interruptible(&info->event_wait_q);
2212                 }
2213         }
2214
2215         if (status & CDCD) {
2216                 /* simulate a common modem status change interrupt
2217                  * for our handler
2218                  */
2219                 get_signals( info );
2220                 isr_io_pin(info,
2221                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2222         }
2223 }
2224
2225 /*
2226  * handle async rx data interrupts
2227  */
2228 static void isr_rxrdy(SLMP_INFO * info)
2229 {
2230         u16 status;
2231         unsigned char DataByte;
2232         struct tty_struct *tty = info->port.tty;
2233         struct  mgsl_icount *icount = &info->icount;
2234
2235         if ( debug_level >= DEBUG_LEVEL_ISR )
2236                 printk("%s(%d):%s isr_rxrdy\n",
2237                         __FILE__,__LINE__,info->device_name);
2238
2239         while((status = read_reg(info,CST0)) & BIT0)
2240         {
2241                 int flag = 0;
2242                 bool over = false;
2243                 DataByte = read_reg(info,TRB);
2244
2245                 icount->rx++;
2246
2247                 if ( status & (PE + FRME + OVRN) ) {
2248                         printk("%s(%d):%s rxerr=%04X\n",
2249                                 __FILE__,__LINE__,info->device_name,status);
2250
2251                         /* update error statistics */
2252                         if (status & PE)
2253                                 icount->parity++;
2254                         else if (status & FRME)
2255                                 icount->frame++;
2256                         else if (status & OVRN)
2257                                 icount->overrun++;
2258
2259                         /* discard char if tty control flags say so */
2260                         if (status & info->ignore_status_mask2)
2261                                 continue;
2262
2263                         status &= info->read_status_mask2;
2264
2265                         if ( tty ) {
2266                                 if (status & PE)
2267                                         flag = TTY_PARITY;
2268                                 else if (status & FRME)
2269                                         flag = TTY_FRAME;
2270                                 if (status & OVRN) {
2271                                         /* Overrun is special, since it's
2272                                          * reported immediately, and doesn't
2273                                          * affect the current character
2274                                          */
2275                                         over = true;
2276                                 }
2277                         }
2278                 }       /* end of if (error) */
2279
2280                 if ( tty ) {
2281                         tty_insert_flip_char(tty, DataByte, flag);
2282                         if (over)
2283                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2284                 }
2285         }
2286
2287         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2288                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2289                         __FILE__,__LINE__,info->device_name,
2290                         icount->rx,icount->brk,icount->parity,
2291                         icount->frame,icount->overrun);
2292         }
2293
2294         if ( tty )
2295                 tty_flip_buffer_push(tty);
2296 }
2297
2298 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2299 {
2300         if ( debug_level >= DEBUG_LEVEL_ISR )
2301                 printk("%s(%d):%s isr_txeom status=%02x\n",
2302                         __FILE__,__LINE__,info->device_name,status);
2303
2304         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2305         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2306         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2307
2308         if (status & UDRN) {
2309                 write_reg(info, CMD, TXRESET);
2310                 write_reg(info, CMD, TXENABLE);
2311         } else
2312                 write_reg(info, CMD, TXBUFCLR);
2313
2314         /* disable and clear tx interrupts */
2315         info->ie0_value &= ~TXRDYE;
2316         info->ie1_value &= ~(IDLE + UDRN);
2317         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2318         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2319
2320         if ( info->tx_active ) {
2321                 if (info->params.mode != MGSL_MODE_ASYNC) {
2322                         if (status & UDRN)
2323                                 info->icount.txunder++;
2324                         else if (status & IDLE)
2325                                 info->icount.txok++;
2326                 }
2327
2328                 info->tx_active = false;
2329                 info->tx_count = info->tx_put = info->tx_get = 0;
2330
2331                 del_timer(&info->tx_timer);
2332
2333                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2334                         info->serial_signals &= ~SerialSignal_RTS;
2335                         info->drop_rts_on_tx_done = false;
2336                         set_signals(info);
2337                 }
2338
2339 #if SYNCLINK_GENERIC_HDLC
2340                 if (info->netcount)
2341                         hdlcdev_tx_done(info);
2342                 else
2343 #endif
2344                 {
2345                         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2346                                 tx_stop(info);
2347                                 return;
2348                         }
2349                         info->pending_bh |= BH_TRANSMIT;
2350                 }
2351         }
2352 }
2353
2354
2355 /*
2356  * handle tx status interrupts
2357  */
2358 static void isr_txint(SLMP_INFO * info)
2359 {
2360         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2361
2362         /* clear status bits */
2363         write_reg(info, SR1, status);
2364
2365         if ( debug_level >= DEBUG_LEVEL_ISR )
2366                 printk("%s(%d):%s isr_txint status=%02x\n",
2367                         __FILE__,__LINE__,info->device_name,status);
2368
2369         if (status & (UDRN + IDLE))
2370                 isr_txeom(info, status);
2371
2372         if (status & CCTS) {
2373                 /* simulate a common modem status change interrupt
2374                  * for our handler
2375                  */
2376                 get_signals( info );
2377                 isr_io_pin(info,
2378                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2379
2380         }
2381 }
2382
2383 /*
2384  * handle async tx data interrupts
2385  */
2386 static void isr_txrdy(SLMP_INFO * info)
2387 {
2388         if ( debug_level >= DEBUG_LEVEL_ISR )
2389                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2390                         __FILE__,__LINE__,info->device_name,info->tx_count);
2391
2392         if (info->params.mode != MGSL_MODE_ASYNC) {
2393                 /* disable TXRDY IRQ, enable IDLE IRQ */
2394                 info->ie0_value &= ~TXRDYE;
2395                 info->ie1_value |= IDLE;
2396                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2397                 return;
2398         }
2399
2400         if (info->port.tty && (info->port.tty->stopped || info->port.tty->hw_stopped)) {
2401                 tx_stop(info);
2402                 return;
2403         }
2404
2405         if ( info->tx_count )
2406                 tx_load_fifo( info );
2407         else {
2408                 info->tx_active = false;
2409                 info->ie0_value &= ~TXRDYE;
2410                 write_reg(info, IE0, info->ie0_value);
2411         }
2412
2413         if (info->tx_count < WAKEUP_CHARS)
2414                 info->pending_bh |= BH_TRANSMIT;
2415 }
2416
2417 static void isr_rxdmaok(SLMP_INFO * info)
2418 {
2419         /* BIT7 = EOT (end of transfer)
2420          * BIT6 = EOM (end of message/frame)
2421          */
2422         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2423
2424         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2425         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2426
2427         if ( debug_level >= DEBUG_LEVEL_ISR )
2428                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2429                         __FILE__,__LINE__,info->device_name,status);
2430
2431         info->pending_bh |= BH_RECEIVE;
2432 }
2433
2434 static void isr_rxdmaerror(SLMP_INFO * info)
2435 {
2436         /* BIT5 = BOF (buffer overflow)
2437          * BIT4 = COF (counter overflow)
2438          */
2439         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2440
2441         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2442         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2443
2444         if ( debug_level >= DEBUG_LEVEL_ISR )
2445                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2446                         __FILE__,__LINE__,info->device_name,status);
2447
2448         info->rx_overflow = true;
2449         info->pending_bh |= BH_RECEIVE;
2450 }
2451
2452 static void isr_txdmaok(SLMP_INFO * info)
2453 {
2454         unsigned char status_reg1 = read_reg(info, SR1);
2455
2456         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2457         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2458         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2459
2460         if ( debug_level >= DEBUG_LEVEL_ISR )
2461                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2462                         __FILE__,__LINE__,info->device_name,status_reg1);
2463
2464         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2465         write_reg16(info, TRC0, 0);
2466         info->ie0_value |= TXRDYE;
2467         write_reg(info, IE0, info->ie0_value);
2468 }
2469
2470 static void isr_txdmaerror(SLMP_INFO * info)
2471 {
2472         /* BIT5 = BOF (buffer overflow)
2473          * BIT4 = COF (counter overflow)
2474          */
2475         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2476
2477         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2478         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2479
2480         if ( debug_level >= DEBUG_LEVEL_ISR )
2481                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2482                         __FILE__,__LINE__,info->device_name,status);
2483 }
2484
2485 /* handle input serial signal changes
2486  */
2487 static void isr_io_pin( SLMP_INFO *info, u16 status )
2488 {
2489         struct  mgsl_icount *icount;
2490
2491         if ( debug_level >= DEBUG_LEVEL_ISR )
2492                 printk("%s(%d):isr_io_pin status=%04X\n",
2493                         __FILE__,__LINE__,status);
2494
2495         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2496                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2497                 icount = &info->icount;
2498                 /* update input line counters */
2499                 if (status & MISCSTATUS_RI_LATCHED) {
2500                         icount->rng++;
2501                         if ( status & SerialSignal_RI )
2502                                 info->input_signal_events.ri_up++;
2503                         else
2504                                 info->input_signal_events.ri_down++;
2505                 }
2506                 if (status & MISCSTATUS_DSR_LATCHED) {
2507                         icount->dsr++;
2508                         if ( status & SerialSignal_DSR )
2509                                 info->input_signal_events.dsr_up++;
2510                         else
2511                                 info->input_signal_events.dsr_down++;
2512                 }
2513                 if (status & MISCSTATUS_DCD_LATCHED) {
2514                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2515                                 info->ie1_value &= ~CDCD;
2516                                 write_reg(info, IE1, info->ie1_value);
2517                         }
2518                         icount->dcd++;
2519                         if (status & SerialSignal_DCD) {
2520                                 info->input_signal_events.dcd_up++;
2521                         } else
2522                                 info->input_signal_events.dcd_down++;
2523 #if SYNCLINK_GENERIC_HDLC
2524                         if (info->netcount) {
2525                                 if (status & SerialSignal_DCD)
2526                                         netif_carrier_on(info->netdev);
2527                                 else
2528                                         netif_carrier_off(info->netdev);
2529                         }
2530 #endif
2531                 }
2532                 if (status & MISCSTATUS_CTS_LATCHED)
2533                 {
2534                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2535                                 info->ie1_value &= ~CCTS;
2536                                 write_reg(info, IE1, info->ie1_value);
2537                         }
2538                         icount->cts++;
2539                         if ( status & SerialSignal_CTS )
2540                                 info->input_signal_events.cts_up++;
2541                         else
2542                                 info->input_signal_events.cts_down++;
2543                 }
2544                 wake_up_interruptible(&info->status_event_wait_q);
2545                 wake_up_interruptible(&info->event_wait_q);
2546
2547                 if ( (info->port.flags & ASYNC_CHECK_CD) &&
2548                      (status & MISCSTATUS_DCD_LATCHED) ) {
2549                         if ( debug_level >= DEBUG_LEVEL_ISR )
2550                                 printk("%s CD now %s...", info->device_name,
2551                                        (status & SerialSignal_DCD) ? "on" : "off");
2552                         if (status & SerialSignal_DCD)
2553                                 wake_up_interruptible(&info->port.open_wait);
2554                         else {
2555                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2556                                         printk("doing serial hangup...");
2557                                 if (info->port.tty)
2558                                         tty_hangup(info->port.tty);
2559                         }
2560                 }
2561
2562                 if ( (info->port.flags & ASYNC_CTS_FLOW) &&
2563                      (status & MISCSTATUS_CTS_LATCHED) ) {
2564                         if ( info->port.tty ) {
2565                                 if (info->port.tty->hw_stopped) {
2566                                         if (status & SerialSignal_CTS) {
2567                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2568                                                         printk("CTS tx start...");
2569                                                 info->port.tty->hw_stopped = 0;
2570                                                 tx_start(info);
2571                                                 info->pending_bh |= BH_TRANSMIT;
2572                                                 return;
2573                                         }
2574                                 } else {
2575                                         if (!(status & SerialSignal_CTS)) {
2576                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2577                                                         printk("CTS tx stop...");
2578                                                 info->port.tty->hw_stopped = 1;
2579                                                 tx_stop(info);
2580                                         }
2581                                 }
2582                         }
2583                 }
2584         }
2585
2586         info->pending_bh |= BH_STATUS;
2587 }
2588
2589 /* Interrupt service routine entry point.
2590  *
2591  * Arguments:
2592  *      irq             interrupt number that caused interrupt
2593  *      dev_id          device ID supplied during interrupt registration
2594  *      regs            interrupted processor context
2595  */
2596 static irqreturn_t synclinkmp_interrupt(int dummy, void *dev_id)
2597 {
2598         SLMP_INFO *info = dev_id;
2599         unsigned char status, status0, status1=0;
2600         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2601         unsigned char timerstatus0, timerstatus1=0;
2602         unsigned char shift;
2603         unsigned int i;
2604         unsigned short tmp;
2605
2606         if ( debug_level >= DEBUG_LEVEL_ISR )
2607                 printk(KERN_DEBUG "%s(%d): synclinkmp_interrupt(%d)entry.\n",
2608                         __FILE__, __LINE__, info->irq_level);
2609
2610         spin_lock(&info->lock);
2611
2612         for(;;) {
2613
2614                 /* get status for SCA0 (ports 0-1) */
2615                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2616                 status0 = (unsigned char)tmp;
2617                 dmastatus0 = (unsigned char)(tmp>>8);
2618                 timerstatus0 = read_reg(info, ISR2);
2619
2620                 if ( debug_level >= DEBUG_LEVEL_ISR )
2621                         printk(KERN_DEBUG "%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2622                                 __FILE__, __LINE__, info->device_name,
2623                                 status0, dmastatus0, timerstatus0);
2624
2625                 if (info->port_count == 4) {
2626                         /* get status for SCA1 (ports 2-3) */
2627                         tmp = read_reg16(info->port_array[2], ISR0);
2628                         status1 = (unsigned char)tmp;
2629                         dmastatus1 = (unsigned char)(tmp>>8);
2630                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2631
2632                         if ( debug_level >= DEBUG_LEVEL_ISR )
2633                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2634                                         __FILE__,__LINE__,info->device_name,
2635                                         status1,dmastatus1,timerstatus1);
2636                 }
2637
2638                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2639                          !status1 && !dmastatus1 && !timerstatus1)
2640                         break;
2641
2642                 for(i=0; i < info->port_count ; i++) {
2643                         if (info->port_array[i] == NULL)
2644                                 continue;
2645                         if (i < 2) {
2646                                 status = status0;
2647                                 dmastatus = dmastatus0;
2648                         } else {
2649                                 status = status1;
2650                                 dmastatus = dmastatus1;
2651                         }
2652
2653                         shift = i & 1 ? 4 :0;
2654
2655                         if (status & BIT0 << shift)
2656                                 isr_rxrdy(info->port_array[i]);
2657                         if (status & BIT1 << shift)
2658                                 isr_txrdy(info->port_array[i]);
2659                         if (status & BIT2 << shift)
2660                                 isr_rxint(info->port_array[i]);
2661                         if (status & BIT3 << shift)
2662                                 isr_txint(info->port_array[i]);
2663
2664                         if (dmastatus & BIT0 << shift)
2665                                 isr_rxdmaerror(info->port_array[i]);
2666                         if (dmastatus & BIT1 << shift)
2667                                 isr_rxdmaok(info->port_array[i]);
2668                         if (dmastatus & BIT2 << shift)
2669                                 isr_txdmaerror(info->port_array[i]);
2670                         if (dmastatus & BIT3 << shift)
2671                                 isr_txdmaok(info->port_array[i]);
2672                 }
2673
2674                 if (timerstatus0 & (BIT5 | BIT4))
2675                         isr_timer(info->port_array[0]);
2676                 if (timerstatus0 & (BIT7 | BIT6))
2677                         isr_timer(info->port_array[1]);
2678                 if (timerstatus1 & (BIT5 | BIT4))
2679                         isr_timer(info->port_array[2]);
2680                 if (timerstatus1 & (BIT7 | BIT6))
2681                         isr_timer(info->port_array[3]);
2682         }
2683
2684         for(i=0; i < info->port_count ; i++) {
2685                 SLMP_INFO * port = info->port_array[i];
2686
2687                 /* Request bottom half processing if there's something
2688                  * for it to do and the bh is not already running.
2689                  *
2690                  * Note: startup adapter diags require interrupts.
2691                  * do not request bottom half processing if the
2692                  * device is not open in a normal mode.
2693                  */
2694                 if ( port && (port->port.count || port->netcount) &&
2695                      port->pending_bh && !port->bh_running &&
2696                      !port->bh_requested ) {
2697                         if ( debug_level >= DEBUG_LEVEL_ISR )
2698                                 printk("%s(%d):%s queueing bh task.\n",
2699                                         __FILE__,__LINE__,port->device_name);
2700                         schedule_work(&port->task);
2701                         port->bh_requested = true;
2702                 }
2703         }
2704
2705         spin_unlock(&info->lock);
2706
2707         if ( debug_level >= DEBUG_LEVEL_ISR )
2708                 printk(KERN_DEBUG "%s(%d):synclinkmp_interrupt(%d)exit.\n",
2709                         __FILE__, __LINE__, info->irq_level);
2710         return IRQ_HANDLED;
2711 }
2712
2713 /* Initialize and start device.
2714  */
2715 static int startup(SLMP_INFO * info)
2716 {
2717         if ( debug_level >= DEBUG_LEVEL_INFO )
2718                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2719
2720         if (info->port.flags & ASYNC_INITIALIZED)
2721                 return 0;
2722
2723         if (!info->tx_buf) {
2724                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2725                 if (!info->tx_buf) {
2726                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2727                                 __FILE__,__LINE__,info->device_name);
2728                         return -ENOMEM;
2729                 }
2730         }
2731
2732         info->pending_bh = 0;
2733
2734         memset(&info->icount, 0, sizeof(info->icount));
2735
2736         /* program hardware for current parameters */
2737         reset_port(info);
2738
2739         change_params(info);
2740
2741         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
2742
2743         if (info->port.tty)
2744                 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2745
2746         info->port.flags |= ASYNC_INITIALIZED;
2747
2748         return 0;
2749 }
2750
2751 /* Called by close() and hangup() to shutdown hardware
2752  */
2753 static void shutdown(SLMP_INFO * info)
2754 {
2755         unsigned long flags;
2756
2757         if (!(info->port.flags & ASYNC_INITIALIZED))
2758                 return;
2759
2760         if (debug_level >= DEBUG_LEVEL_INFO)
2761                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2762                          __FILE__,__LINE__, info->device_name );
2763
2764         /* clear status wait queue because status changes */
2765         /* can't happen after shutting down the hardware */
2766         wake_up_interruptible(&info->status_event_wait_q);
2767         wake_up_interruptible(&info->event_wait_q);
2768
2769         del_timer(&info->tx_timer);
2770         del_timer(&info->status_timer);
2771
2772         kfree(info->tx_buf);
2773         info->tx_buf = NULL;
2774
2775         spin_lock_irqsave(&info->lock,flags);
2776
2777         reset_port(info);
2778
2779         if (!info->port.tty || info->port.tty->termios->c_cflag & HUPCL) {
2780                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2781                 set_signals(info);
2782         }
2783
2784         spin_unlock_irqrestore(&info->lock,flags);
2785
2786         if (info->port.tty)
2787                 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2788
2789         info->port.flags &= ~ASYNC_INITIALIZED;
2790 }
2791
2792 static void program_hw(SLMP_INFO *info)
2793 {
2794         unsigned long flags;
2795
2796         spin_lock_irqsave(&info->lock,flags);
2797
2798         rx_stop(info);
2799         tx_stop(info);
2800
2801         info->tx_count = info->tx_put = info->tx_get = 0;
2802
2803         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2804                 hdlc_mode(info);
2805         else
2806                 async_mode(info);
2807
2808         set_signals(info);
2809
2810         info->dcd_chkcount = 0;
2811         info->cts_chkcount = 0;
2812         info->ri_chkcount = 0;
2813         info->dsr_chkcount = 0;
2814
2815         info->ie1_value |= (CDCD|CCTS);
2816         write_reg(info, IE1, info->ie1_value);
2817
2818         get_signals(info);
2819
2820         if (info->netcount || (info->port.tty && info->port.tty->termios->c_cflag & CREAD) )
2821                 rx_start(info);
2822
2823         spin_unlock_irqrestore(&info->lock,flags);
2824 }
2825
2826 /* Reconfigure adapter based on new parameters
2827  */
2828 static void change_params(SLMP_INFO *info)
2829 {
2830         unsigned cflag;
2831         int bits_per_char;
2832
2833         if (!info->port.tty || !info->port.tty->termios)
2834                 return;
2835
2836         if (debug_level >= DEBUG_LEVEL_INFO)
2837                 printk("%s(%d):%s change_params()\n",
2838                          __FILE__,__LINE__, info->device_name );
2839
2840         cflag = info->port.tty->termios->c_cflag;
2841
2842         /* if B0 rate (hangup) specified then negate DTR and RTS */
2843         /* otherwise assert DTR and RTS */
2844         if (cflag & CBAUD)
2845                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2846         else
2847                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2848
2849         /* byte size and parity */
2850
2851         switch (cflag & CSIZE) {
2852               case CS5: info->params.data_bits = 5; break;
2853               case CS6: info->params.data_bits = 6; break;
2854               case CS7: info->params.data_bits = 7; break;
2855               case CS8: info->params.data_bits = 8; break;
2856               /* Never happens, but GCC is too dumb to figure it out */
2857               default:  info->params.data_bits = 7; break;
2858               }
2859
2860         if (cflag & CSTOPB)
2861                 info->params.stop_bits = 2;
2862         else
2863                 info->params.stop_bits = 1;
2864
2865         info->params.parity = ASYNC_PARITY_NONE;
2866         if (cflag & PARENB) {
2867                 if (cflag & PARODD)
2868                         info->params.parity = ASYNC_PARITY_ODD;
2869                 else
2870                         info->params.parity = ASYNC_PARITY_EVEN;
2871 #ifdef CMSPAR
2872                 if (cflag & CMSPAR)
2873                         info->params.parity = ASYNC_PARITY_SPACE;
2874 #endif
2875         }
2876
2877         /* calculate number of jiffies to transmit a full
2878          * FIFO (32 bytes) at specified data rate
2879          */
2880         bits_per_char = info->params.data_bits +
2881                         info->params.stop_bits + 1;
2882
2883         /* if port data rate is set to 460800 or less then
2884          * allow tty settings to override, otherwise keep the
2885          * current data rate.
2886          */
2887         if (info->params.data_rate <= 460800) {
2888                 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2889         }
2890
2891         if ( info->params.data_rate ) {
2892                 info->timeout = (32*HZ*bits_per_char) /
2893                                 info->params.data_rate;
2894         }
2895         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2896
2897         if (cflag & CRTSCTS)
2898                 info->port.flags |= ASYNC_CTS_FLOW;
2899         else
2900                 info->port.flags &= ~ASYNC_CTS_FLOW;
2901
2902         if (cflag & CLOCAL)
2903                 info->port.flags &= ~ASYNC_CHECK_CD;
2904         else
2905                 info->port.flags |= ASYNC_CHECK_CD;
2906
2907         /* process tty input control flags */
2908
2909         info->read_status_mask2 = OVRN;
2910         if (I_INPCK(info->port.tty))
2911                 info->read_status_mask2 |= PE | FRME;
2912         if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2913                 info->read_status_mask1 |= BRKD;
2914         if (I_IGNPAR(info->port.tty))
2915                 info->ignore_status_mask2 |= PE | FRME;
2916         if (I_IGNBRK(info->port.tty)) {
2917                 info->ignore_status_mask1 |= BRKD;
2918                 /* If ignoring parity and break indicators, ignore
2919                  * overruns too.  (For real raw support).
2920                  */
2921                 if (I_IGNPAR(info->port.tty))
2922                         info->ignore_status_mask2 |= OVRN;
2923         }
2924
2925         program_hw(info);
2926 }
2927
2928 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2929 {
2930         int err;
2931
2932         if (debug_level >= DEBUG_LEVEL_INFO)
2933                 printk("%s(%d):%s get_params()\n",
2934                          __FILE__,__LINE__, info->device_name);
2935
2936         if (!user_icount) {
2937                 memset(&info->icount, 0, sizeof(info->icount));
2938         } else {
2939                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2940                 if (err)
2941                         return -EFAULT;
2942         }
2943
2944         return 0;
2945 }
2946
2947 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2948 {
2949         int err;
2950         if (debug_level >= DEBUG_LEVEL_INFO)
2951                 printk("%s(%d):%s get_params()\n",
2952                          __FILE__,__LINE__, info->device_name);
2953
2954         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2955         if (err) {
2956                 if ( debug_level >= DEBUG_LEVEL_INFO )
2957                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2958                                 __FILE__,__LINE__,info->device_name);
2959                 return -EFAULT;
2960         }
2961
2962         return 0;
2963 }
2964
2965 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2966 {
2967         unsigned long flags;
2968         MGSL_PARAMS tmp_params;
2969         int err;
2970
2971         if (debug_level >= DEBUG_LEVEL_INFO)
2972                 printk("%s(%d):%s set_params\n",
2973                         __FILE__,__LINE__,info->device_name );
2974         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2975         if (err) {
2976                 if ( debug_level >= DEBUG_LEVEL_INFO )
2977                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2978                                 __FILE__,__LINE__,info->device_name);
2979                 return -EFAULT;
2980         }
2981
2982         spin_lock_irqsave(&info->lock,flags);
2983         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2984         spin_unlock_irqrestore(&info->lock,flags);
2985
2986         change_params(info);
2987
2988         return 0;
2989 }
2990
2991 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2992 {
2993         int err;
2994
2995         if (debug_level >= DEBUG_LEVEL_INFO)
2996                 printk("%s(%d):%s get_txidle()=%d\n",
2997                          __FILE__,__LINE__, info->device_name, info->idle_mode);
2998
2999         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
3000         if (err) {
3001                 if ( debug_level >= DEBUG_LEVEL_INFO )
3002                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
3003                                 __FILE__,__LINE__,info->device_name);
3004                 return -EFAULT;
3005         }
3006
3007         return 0;
3008 }
3009
3010 static int set_txidle(SLMP_INFO * info, int idle_mode)
3011 {
3012         unsigned long flags;
3013
3014         if (debug_level >= DEBUG_LEVEL_INFO)
3015                 printk("%s(%d):%s set_txidle(%d)\n",
3016                         __FILE__,__LINE__,info->device_name, idle_mode );
3017
3018         spin_lock_irqsave(&info->lock,flags);
3019         info->idle_mode = idle_mode;
3020         tx_set_idle( info );
3021         spin_unlock_irqrestore(&info->lock,flags);
3022         return 0;
3023 }
3024
3025 static int tx_enable(SLMP_INFO * info, int enable)
3026 {
3027         unsigned long flags;
3028
3029         if (debug_level >= DEBUG_LEVEL_INFO)
3030                 printk("%s(%d):%s tx_enable(%d)\n",
3031                         __FILE__,__LINE__,info->device_name, enable);
3032
3033         spin_lock_irqsave(&info->lock,flags);
3034         if ( enable ) {
3035                 if ( !info->tx_enabled ) {
3036                         tx_start(info);
3037                 }
3038         } else {
3039                 if ( info->tx_enabled )
3040                         tx_stop(info);
3041         }
3042         spin_unlock_irqrestore(&info->lock,flags);
3043         return 0;
3044 }
3045
3046 /* abort send HDLC frame
3047  */
3048 static int tx_abort(SLMP_INFO * info)
3049 {
3050         unsigned long flags;
3051
3052         if (debug_level >= DEBUG_LEVEL_INFO)
3053                 printk("%s(%d):%s tx_abort()\n",
3054                         __FILE__,__LINE__,info->device_name);
3055
3056         spin_lock_irqsave(&info->lock,flags);
3057         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3058                 info->ie1_value &= ~UDRN;
3059                 info->ie1_value |= IDLE;
3060                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
3061                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
3062
3063                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
3064                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3065
3066                 write_reg(info, CMD, TXABORT);
3067         }
3068         spin_unlock_irqrestore(&info->lock,flags);
3069         return 0;
3070 }
3071
3072 static int rx_enable(SLMP_INFO * info, int enable)
3073 {
3074         unsigned long flags;
3075
3076         if (debug_level >= DEBUG_LEVEL_INFO)
3077                 printk("%s(%d):%s rx_enable(%d)\n",
3078                         __FILE__,__LINE__,info->device_name,enable);
3079
3080         spin_lock_irqsave(&info->lock,flags);
3081         if ( enable ) {
3082                 if ( !info->rx_enabled )
3083                         rx_start(info);
3084         } else {
3085                 if ( info->rx_enabled )
3086                         rx_stop(info);
3087         }
3088         spin_unlock_irqrestore(&info->lock,flags);
3089         return 0;
3090 }
3091
3092 /* wait for specified event to occur
3093  */
3094 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3095 {
3096         unsigned long flags;
3097         int s;
3098         int rc=0;
3099         struct mgsl_icount cprev, cnow;
3100         int events;
3101         int mask;
3102         struct  _input_signal_events oldsigs, newsigs;
3103         DECLARE_WAITQUEUE(wait, current);
3104
3105         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3106         if (rc) {
3107                 return  -EFAULT;
3108         }
3109
3110         if (debug_level >= DEBUG_LEVEL_INFO)
3111                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3112                         __FILE__,__LINE__,info->device_name,mask);
3113
3114         spin_lock_irqsave(&info->lock,flags);
3115
3116         /* return immediately if state matches requested events */
3117         get_signals(info);
3118         s = info->serial_signals;
3119
3120         events = mask &
3121                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3122                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3123                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3124                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3125         if (events) {
3126                 spin_unlock_irqrestore(&info->lock,flags);
3127                 goto exit;
3128         }
3129
3130         /* save current irq counts */
3131         cprev = info->icount;
3132         oldsigs = info->input_signal_events;
3133
3134         /* enable hunt and idle irqs if needed */
3135         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3136                 unsigned char oldval = info->ie1_value;
3137                 unsigned char newval = oldval +
3138                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3139                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3140                 if ( oldval != newval ) {
3141                         info->ie1_value = newval;
3142                         write_reg(info, IE1, info->ie1_value);
3143                 }
3144         }
3145
3146         set_current_state(TASK_INTERRUPTIBLE);
3147         add_wait_queue(&info->event_wait_q, &wait);
3148
3149         spin_unlock_irqrestore(&info->lock,flags);
3150
3151         for(;;) {
3152                 schedule();
3153                 if (signal_pending(current)) {
3154                         rc = -ERESTARTSYS;
3155                         break;
3156                 }
3157
3158                 /* get current irq counts */
3159                 spin_lock_irqsave(&info->lock,flags);
3160                 cnow = info->icount;
3161                 newsigs = info->input_signal_events;
3162                 set_current_state(TASK_INTERRUPTIBLE);
3163                 spin_unlock_irqrestore(&info->lock,flags);
3164
3165                 /* if no change, wait aborted for some reason */
3166                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3167                     newsigs.dsr_down == oldsigs.dsr_down &&
3168                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3169                     newsigs.dcd_down == oldsigs.dcd_down &&
3170                     newsigs.cts_up   == oldsigs.cts_up   &&
3171                     newsigs.cts_down == oldsigs.cts_down &&
3172                     newsigs.ri_up    == oldsigs.ri_up    &&
3173                     newsigs.ri_down  == oldsigs.ri_down  &&
3174                     cnow.exithunt    == cprev.exithunt   &&
3175                     cnow.rxidle      == cprev.rxidle) {
3176                         rc = -EIO;
3177                         break;
3178                 }
3179
3180                 events = mask &
3181                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3182                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3183                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3184                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3185                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3186                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3187                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3188                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3189                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3190                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3191                 if (events)
3192                         break;
3193
3194                 cprev = cnow;
3195                 oldsigs = newsigs;
3196         }
3197
3198         remove_wait_queue(&info->event_wait_q, &wait);
3199         set_current_state(TASK_RUNNING);
3200
3201
3202         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3203                 spin_lock_irqsave(&info->lock,flags);
3204                 if (!waitqueue_active(&info->event_wait_q)) {
3205                         /* disable enable exit hunt mode/idle rcvd IRQs */
3206                         info->ie1_value &= ~(FLGD|IDLD);
3207                         write_reg(info, IE1, info->ie1_value);
3208                 }
3209                 spin_unlock_irqrestore(&info->lock,flags);
3210         }
3211 exit:
3212         if ( rc == 0 )
3213                 PUT_USER(rc, events, mask_ptr);
3214
3215         return rc;
3216 }
3217
3218 static int modem_input_wait(SLMP_INFO *info,int arg)
3219 {
3220         unsigned long flags;
3221         int rc;
3222         struct mgsl_icount cprev, cnow;
3223         DECLARE_WAITQUEUE(wait, current);
3224
3225         /* save current irq counts */
3226         spin_lock_irqsave(&info->lock,flags);
3227         cprev = info->icount;
3228         add_wait_queue(&info->status_event_wait_q, &wait);
3229         set_current_state(TASK_INTERRUPTIBLE);
3230         spin_unlock_irqrestore(&info->lock,flags);
3231
3232         for(;;) {
3233                 schedule();
3234                 if (signal_pending(current)) {
3235                         rc = -ERESTARTSYS;
3236                         break;
3237                 }
3238
3239                 /* get new irq counts */
3240                 spin_lock_irqsave(&info->lock,flags);
3241                 cnow = info->icount;
3242                 set_current_state(TASK_INTERRUPTIBLE);
3243                 spin_unlock_irqrestore(&info->lock,flags);
3244
3245                 /* if no change, wait aborted for some reason */
3246                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3247                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3248                         rc = -EIO;
3249                         break;
3250                 }
3251
3252                 /* check for change in caller specified modem input */
3253                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3254                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3255                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3256                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3257                         rc = 0;
3258                         break;
3259                 }
3260
3261                 cprev = cnow;
3262         }
3263         remove_wait_queue(&info->status_event_wait_q, &wait);
3264         set_current_state(TASK_RUNNING);
3265         return rc;
3266 }
3267
3268 /* return the state of the serial control and status signals
3269  */
3270 static int tiocmget(struct tty_struct *tty, struct file *file)
3271 {
3272         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3273         unsigned int result;
3274         unsigned long flags;
3275
3276         spin_lock_irqsave(&info->lock,flags);
3277         get_signals(info);
3278         spin_unlock_irqrestore(&info->lock,flags);
3279
3280         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3281                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3282                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3283                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3284                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3285                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3286
3287         if (debug_level >= DEBUG_LEVEL_INFO)
3288                 printk("%s(%d):%s tiocmget() value=%08X\n",
3289                          __FILE__,__LINE__, info->device_name, result );
3290         return result;
3291 }
3292
3293 /* set modem control signals (DTR/RTS)
3294  */
3295 static int tiocmset(struct tty_struct *tty, struct file *file,
3296                     unsigned int set, unsigned int clear)
3297 {
3298         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3299         unsigned long flags;
3300
3301         if (debug_level >= DEBUG_LEVEL_INFO)
3302                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3303                         __FILE__,__LINE__,info->device_name, set, clear);
3304
3305         if (set & TIOCM_RTS)
3306                 info->serial_signals |= SerialSignal_RTS;
3307         if (set & TIOCM_DTR)
3308                 info->serial_signals |= SerialSignal_DTR;
3309         if (clear & TIOCM_RTS)
3310                 info->serial_signals &= ~SerialSignal_RTS;
3311         if (clear & TIOCM_DTR)
3312                 info->serial_signals &= ~SerialSignal_DTR;
3313
3314         spin_lock_irqsave(&info->lock,flags);
3315         set_signals(info);
3316         spin_unlock_irqrestore(&info->lock,flags);
3317
3318         return 0;
3319 }
3320
3321
3322
3323 /* Block the current process until the specified port is ready to open.
3324  */
3325 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3326                            SLMP_INFO *info)
3327 {
3328         DECLARE_WAITQUEUE(wait, current);
3329         int             retval;
3330         bool            do_clocal = false;
3331         bool            extra_count = false;
3332         unsigned long   flags;
3333
3334         if (debug_level >= DEBUG_LEVEL_INFO)
3335                 printk("%s(%d):%s block_til_ready()\n",
3336                          __FILE__,__LINE__, tty->driver->name );
3337
3338         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3339                 /* nonblock mode is set or port is not enabled */
3340                 /* just verify that callout device is not active */
3341                 info->port.flags |= ASYNC_NORMAL_ACTIVE;
3342                 return 0;
3343         }
3344
3345         if (tty->termios->c_cflag & CLOCAL)
3346                 do_clocal = true;
3347
3348         /* Wait for carrier detect and the line to become
3349          * free (i.e., not in use by the callout).  While we are in
3350          * this loop, info->port.count is dropped by one, so that
3351          * close() knows when to free things.  We restore it upon
3352          * exit, either normal or abnormal.
3353          */
3354
3355         retval = 0;
3356         add_wait_queue(&info->port.open_wait, &wait);
3357
3358         if (debug_level >= DEBUG_LEVEL_INFO)
3359                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3360                          __FILE__,__LINE__, tty->driver->name, info->port.count );
3361
3362         spin_lock_irqsave(&info->lock, flags);
3363         if (!tty_hung_up_p(filp)) {
3364                 extra_count = true;
3365                 info->port.count--;
3366         }
3367         spin_unlock_irqrestore(&info->lock, flags);
3368         info->port.blocked_open++;
3369
3370         while (1) {
3371                 if ((tty->termios->c_cflag & CBAUD)) {
3372                         spin_lock_irqsave(&info->lock,flags);
3373                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3374                         set_signals(info);
3375                         spin_unlock_irqrestore(&info->lock,flags);
3376                 }
3377
3378                 set_current_state(TASK_INTERRUPTIBLE);
3379
3380                 if (tty_hung_up_p(filp) || !(info->port.flags & ASYNC_INITIALIZED)){
3381                         retval = (info->port.flags & ASYNC_HUP_NOTIFY) ?
3382                                         -EAGAIN : -ERESTARTSYS;
3383                         break;
3384                 }
3385
3386                 spin_lock_irqsave(&info->lock,flags);
3387                 get_signals(info);
3388                 spin_unlock_irqrestore(&info->lock,flags);
3389
3390                 if (!(info->port.flags & ASYNC_CLOSING) &&
3391                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3392                         break;
3393                 }
3394
3395                 if (signal_pending(current)) {
3396                         retval = -ERESTARTSYS;
3397                         break;
3398                 }
3399
3400                 if (debug_level >= DEBUG_LEVEL_INFO)
3401                         printk("%s(%d):%s block_til_ready() count=%d\n",
3402                                  __FILE__,__LINE__, tty->driver->name, info->port.count );
3403
3404                 schedule();
3405         }
3406
3407         set_current_state(TASK_RUNNING);
3408         remove_wait_queue(&info->port.open_wait, &wait);
3409
3410         if (extra_count)
3411                 info->port.count++;
3412         info->port.blocked_open--;
3413
3414         if (debug_level >= DEBUG_LEVEL_INFO)
3415                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3416                          __FILE__,__LINE__, tty->driver->name, info->port.count );
3417
3418         if (!retval)
3419                 info->port.flags |= ASYNC_NORMAL_ACTIVE;
3420
3421         return retval;
3422 }
3423
3424 static int alloc_dma_bufs(SLMP_INFO *info)
3425 {
3426         unsigned short BuffersPerFrame;
3427         unsigned short BufferCount;
3428
3429         // Force allocation to start at 64K boundary for each port.
3430         // This is necessary because *all* buffer descriptors for a port
3431         // *must* be in the same 64K block. All descriptors on a port
3432         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3433         // into the CBP register.
3434         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3435
3436         /* Calculate the number of DMA buffers necessary to hold the */
3437         /* largest allowable frame size. Note: If the max frame size is */
3438         /* not an even multiple of the DMA buffer size then we need to */
3439         /* round the buffer count per frame up one. */
3440
3441         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3442         if ( info->max_frame_size % SCABUFSIZE )
3443                 BuffersPerFrame++;
3444
3445         /* calculate total number of data buffers (SCABUFSIZE) possible
3446          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3447          * for the descriptor list (BUFFERLISTSIZE).
3448          */
3449         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3450
3451         /* limit number of buffers to maximum amount of descriptors */
3452         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3453                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3454
3455         /* use enough buffers to transmit one max size frame */
3456         info->tx_buf_count = BuffersPerFrame + 1;
3457
3458         /* never use more than half the available buffers for transmit */
3459         if (info->tx_buf_count > (BufferCount/2))
3460                 info->tx_buf_count = BufferCount/2;
3461
3462         if (info->tx_buf_count > SCAMAXDESC)
3463                 info->tx_buf_count = SCAMAXDESC;
3464
3465         /* use remaining buffers for receive */
3466         info->rx_buf_count = BufferCount - info->tx_buf_count;
3467
3468         if (info->rx_buf_count > SCAMAXDESC)
3469                 info->rx_buf_count = SCAMAXDESC;
3470
3471         if ( debug_level >= DEBUG_LEVEL_INFO )
3472                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3473                         __FILE__,__LINE__, info->device_name,
3474                         info->tx_buf_count,info->rx_buf_count);
3475
3476         if ( alloc_buf_list( info ) < 0 ||
3477                 alloc_frame_bufs(info,
3478                                         info->rx_buf_list,
3479                                         info->rx_buf_list_ex,
3480                                         info->rx_buf_count) < 0 ||
3481                 alloc_frame_bufs(info,
3482                                         info->tx_buf_list,
3483                                         info->tx_buf_list_ex,
3484                                         info->tx_buf_count) < 0 ||
3485                 alloc_tmp_rx_buf(info) < 0 ) {
3486                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3487                         __FILE__,__LINE__, info->device_name);
3488                 return -ENOMEM;
3489         }
3490
3491         rx_reset_buffers( info );
3492
3493         return 0;
3494 }
3495
3496 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3497  */
3498 static int alloc_buf_list(SLMP_INFO *info)
3499 {
3500         unsigned int i;
3501
3502         /* build list in adapter shared memory */
3503         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3504         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3505         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3506
3507         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3508
3509         /* Save virtual address pointers to the receive and */
3510         /* transmit buffer lists. (Receive 1st). These pointers will */
3511         /* be used by the processor to access the lists. */
3512         info->rx_buf_list = (SCADESC *)info->buffer_list;
3513
3514         info->tx_buf_list = (SCADESC *)info->buffer_list;
3515         info->tx_buf_list += info->rx_buf_count;
3516
3517         /* Build links for circular buffer entry lists (tx and rx)
3518          *
3519          * Note: links are physical addresses read by the SCA device
3520          * to determine the next buffer entry to use.
3521          */
3522
3523         for ( i = 0; i < info->rx_buf_count; i++ ) {
3524                 /* calculate and store physical address of this buffer entry */
3525                 info->rx_buf_list_ex[i].phys_entry =
3526                         info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3527
3528                 /* calculate and store physical address of */
3529                 /* next entry in cirular list of entries */
3530                 info->rx_buf_list[i].next = info->buffer_list_phys;
3531                 if ( i < info->rx_buf_count - 1 )
3532                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3533
3534                 info->rx_buf_list[i].length = SCABUFSIZE;
3535         }
3536
3537         for ( i = 0; i < info->tx_buf_count; i++ ) {
3538                 /* calculate and store physical address of this buffer entry */
3539                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3540                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3541
3542                 /* calculate and store physical address of */
3543                 /* next entry in cirular list of entries */
3544
3545                 info->tx_buf_list[i].next = info->buffer_list_phys +
3546                         info->rx_buf_count * sizeof(SCADESC);
3547
3548                 if ( i < info->tx_buf_count - 1 )
3549                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3550         }
3551
3552         return 0;
3553 }
3554
3555 /* Allocate the frame DMA buffers used by the specified buffer list.
3556  */
3557 static int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3558 {
3559         int i;
3560         unsigned long phys_addr;
3561
3562         for ( i = 0; i < count; i++ ) {
3563                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3564                 phys_addr = info->port_array[0]->last_mem_alloc;
3565                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3566
3567                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3568                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3569         }
3570
3571         return 0;
3572 }
3573
3574 static void free_dma_bufs(SLMP_INFO *info)
3575 {
3576         info->buffer_list = NULL;
3577         info->rx_buf_list = NULL;
3578         info->tx_buf_list = NULL;
3579 }
3580
3581 /* allocate buffer large enough to hold max_frame_size.
3582  * This buffer is used to pass an assembled frame to the line discipline.
3583  */
3584 static int alloc_tmp_rx_buf(SLMP_INFO *info)
3585 {
3586         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3587         if (info->tmp_rx_buf == NULL)
3588                 return -ENOMEM;
3589         return 0;
3590 }
3591
3592 static void free_tmp_rx_buf(SLMP_INFO *info)
3593 {
3594         kfree(info->tmp_rx_buf);
3595         info->tmp_rx_buf = NULL;
3596 }
3597
3598 static int claim_resources(SLMP_INFO *info)
3599 {
3600         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3601                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3602                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3603                 info->init_error = DiagStatus_AddressConflict;
3604                 goto errout;
3605         }
3606         else
3607                 info->shared_mem_requested = true;
3608
3609         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3610                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3611                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3612                 info->init_error = DiagStatus_AddressConflict;
3613                 goto errout;
3614         }
3615         else
3616                 info->lcr_mem_requested = true;
3617
3618         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3619                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3620                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3621                 info->init_error = DiagStatus_AddressConflict;
3622                 goto errout;
3623         }
3624         else
3625                 info->sca_base_requested = true;
3626
3627         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3628                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3629                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3630                 info->init_error = DiagStatus_AddressConflict;
3631                 goto errout;
3632         }
3633         else
3634                 info->sca_statctrl_requested = true;
3635
3636         info->memory_base = ioremap_nocache(info->phys_memory_base,
3637                                                                 SCA_MEM_SIZE);
3638         if (!info->memory_base) {
3639                 printk( "%s(%d):%s Cant map shared memory, MemAddr=%08X\n",
3640                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3641                 info->init_error = DiagStatus_CantAssignPciResources;
3642                 goto errout;
3643         }
3644
3645         info->lcr_base = ioremap_nocache(info->phys_lcr_base, PAGE_SIZE);
3646         if (!info->lcr_base) {
3647                 printk( "%s(%d):%s Cant map LCR memory, MemAddr=%08X\n",
3648                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3649                 info->init_error = DiagStatus_CantAssignPciResources;
3650                 goto errout;
3651         }
3652         info->lcr_base += info->lcr_offset;
3653
3654         info->sca_base = ioremap_nocache(info->phys_sca_base, PAGE_SIZE);
3655         if (!info->sca_base) {
3656                 printk( "%s(%d):%s Cant map SCA memory, MemAddr=%08X\n",
3657                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3658                 info->init_error = DiagStatus_CantAssignPciResources;
3659                 goto errout;
3660         }
3661         info->sca_base += info->sca_offset;
3662
3663         info->statctrl_base = ioremap_nocache(info->phys_statctrl_base,
3664                                                                 PAGE_SIZE);
3665         if (!info->statctrl_base) {
3666                 printk( "%s(%d):%s Cant map SCA Status/Control memory, MemAddr=%08X\n",
3667                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3668                 info->init_error = DiagStatus_CantAssignPciResources;
3669                 goto errout;
3670         }
3671         info->statctrl_base += info->statctrl_offset;
3672
3673         if ( !memory_test(info) ) {
3674                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3675                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3676                 info->init_error = DiagStatus_MemoryError;
3677                 goto errout;
3678         }
3679
3680         return 0;
3681
3682 errout:
3683         release_resources( info );
3684         return -ENODEV;
3685 }
3686
3687 static void release_resources(SLMP_INFO *info)
3688 {
3689         if ( debug_level >= DEBUG_LEVEL_INFO )
3690                 printk( "%s(%d):%s release_resources() entry\n",
3691                         __FILE__,__LINE__,info->device_name );
3692
3693         if ( info->irq_requested ) {
3694                 free_irq(info->irq_level, info);
3695                 info->irq_requested = false;
3696         }
3697
3698         if ( info->shared_mem_requested ) {
3699                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3700                 info->shared_mem_requested = false;
3701         }
3702         if ( info->lcr_mem_requested ) {
3703                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3704                 info->lcr_mem_requested = false;
3705         }
3706         if ( info->sca_base_requested ) {
3707                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3708                 info->sca_base_requested = false;
3709         }
3710         if ( info->sca_statctrl_requested ) {
3711                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3712                 info->sca_statctrl_requested = false;
3713         }
3714
3715         if (info->memory_base){
3716                 iounmap(info->memory_base);
3717                 info->memory_base = NULL;
3718         }
3719
3720         if (info->sca_base) {
3721                 iounmap(info->sca_base - info->sca_offset);
3722                 info->sca_base=NULL;
3723         }
3724
3725         if (info->statctrl_base) {
3726                 iounmap(info->statctrl_base - info->statctrl_offset);
3727                 info->statctrl_base=NULL;
3728         }
3729
3730         if (info->lcr_base){
3731                 iounmap(info->lcr_base - info->lcr_offset);
3732                 info->lcr_base = NULL;
3733         }
3734
3735         if ( debug_level >= DEBUG_LEVEL_INFO )
3736                 printk( "%s(%d):%s release_resources() exit\n",
3737                         __FILE__,__LINE__,info->device_name );
3738 }
3739
3740 /* Add the specified device instance data structure to the
3741  * global linked list of devices and increment the device count.
3742  */
3743 static void add_device(SLMP_INFO *info)
3744 {
3745         info->next_device = NULL;
3746         info->line = synclinkmp_device_count;
3747         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3748
3749         if (info->line < MAX_DEVICES) {
3750                 if (maxframe[info->line])
3751                         info->max_frame_size = maxframe[info->line];
3752         }
3753
3754         synclinkmp_device_count++;
3755
3756         if ( !synclinkmp_device_list )
3757                 synclinkmp_device_list = info;
3758         else {
3759                 SLMP_INFO *current_dev = synclinkmp_device_list;
3760                 while( current_dev->next_device )
3761                         current_dev = current_dev->next_device;
3762                 current_dev->next_device = info;
3763         }
3764
3765         if ( info->max_frame_size < 4096 )
3766                 info->max_frame_size = 4096;
3767         else if ( info->max_frame_size > 65535 )
3768                 info->max_frame_size = 65535;
3769
3770         printk( "SyncLink MultiPort %s: "
3771                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3772                 info->device_name,
3773                 info->phys_sca_base,
3774                 info->phys_memory_base,
3775                 info->phys_statctrl_base,
3776                 info->phys_lcr_base,
3777                 info->irq_level,
3778                 info->max_frame_size );
3779
3780 #if SYNCLINK_GENERIC_HDLC
3781         hdlcdev_init(info);
3782 #endif
3783 }
3784
3785 /* Allocate and initialize a device instance structure
3786  *
3787  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3788  */
3789 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3790 {
3791         SLMP_INFO *info;
3792
3793         info = kzalloc(sizeof(SLMP_INFO),
3794                  GFP_KERNEL);
3795
3796         if (!info) {
3797                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3798                         __FILE__,__LINE__, adapter_num, port_num);
3799         } else {
3800                 tty_port_init(&info->port);
3801                 info->magic = MGSL_MAGIC;
3802                 INIT_WORK(&info->task, bh_handler);
3803                 info->max_frame_size = 4096;
3804                 info->port.close_delay = 5*HZ/10;
3805                 info->port.closing_wait = 30*HZ;
3806                 init_waitqueue_head(&info->status_event_wait_q);
3807                 init_waitqueue_head(&info->event_wait_q);
3808                 spin_lock_init(&info->netlock);
3809                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3810                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3811                 info->adapter_num = adapter_num;
3812                 info->port_num = port_num;
3813
3814                 /* Copy configuration info to device instance data */
3815                 info->irq_level = pdev->irq;
3816                 info->phys_lcr_base = pci_resource_start(pdev,0);
3817                 info->phys_sca_base = pci_resource_start(pdev,2);
3818                 info->phys_memory_base = pci_resource_start(pdev,3);
3819                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3820
3821                 /* Because veremap only works on page boundaries we must map
3822                  * a larger area than is actually implemented for the LCR
3823                  * memory range. We map a full page starting at the page boundary.
3824                  */
3825                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3826                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3827
3828                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3829                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3830
3831                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3832                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3833
3834                 info->bus_type = MGSL_BUS_TYPE_PCI;
3835                 info->irq_flags = IRQF_SHARED;
3836
3837                 setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
3838                 setup_timer(&info->status_timer, status_timeout,
3839                                 (unsigned long)info);
3840
3841                 /* Store the PCI9050 misc control register value because a flaw
3842                  * in the PCI9050 prevents LCR registers from being read if
3843                  * BIOS assigns an LCR base address with bit 7 set.
3844                  *
3845                  * Only the misc control register is accessed for which only
3846                  * write access is needed, so set an initial value and change
3847                  * bits to the device instance data as we write the value
3848                  * to the actual misc control register.
3849                  */
3850                 info->misc_ctrl_value = 0x087e4546;
3851
3852                 /* initial port state is unknown - if startup errors
3853                  * occur, init_error will be set to indicate the
3854                  * problem. Once the port is fully initialized,
3855                  * this value will be set to 0 to indicate the
3856                  * port is available.
3857                  */
3858                 info->init_error = -1;
3859         }
3860
3861         return info;
3862 }
3863
3864 static void device_init(int adapter_num, struct pci_dev *pdev)
3865 {
3866         SLMP_INFO *port_array[SCA_MAX_PORTS];
3867         int port;
3868
3869         /* allocate device instances for up to SCA_MAX_PORTS devices */
3870         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3871                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3872                 if( port_array[port] == NULL ) {
3873                         for ( --port; port >= 0; --port )
3874                                 kfree(port_array[port]);
3875                         return;
3876                 }
3877         }
3878
3879         /* give copy of port_array to all ports and add to device list  */
3880         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3881                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3882                 add_device( port_array[port] );
3883                 spin_lock_init(&port_array[port]->lock);
3884         }
3885
3886         /* Allocate and claim adapter resources */
3887         if ( !claim_resources(port_array[0]) ) {
3888
3889                 alloc_dma_bufs(port_array[0]);
3890
3891                 /* copy resource information from first port to others */
3892                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3893                         port_array[port]->lock  = port_array[0]->lock;
3894                         port_array[port]->irq_level     = port_array[0]->irq_level;
3895                         port_array[port]->memory_base   = port_array[0]->memory_base;
3896                         port_array[port]->sca_base      = port_array[0]->sca_base;
3897                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3898                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3899                         alloc_dma_bufs(port_array[port]);
3900                 }
3901
3902                 if ( request_irq(port_array[0]->irq_level,
3903                                         synclinkmp_interrupt,
3904                                         port_array[0]->irq_flags,
3905                                         port_array[0]->device_name,
3906                                         port_array[0]) < 0 ) {
3907                         printk( "%s(%d):%s Cant request interrupt, IRQ=%d\n",
3908                                 __FILE__,__LINE__,
3909                                 port_array[0]->device_name,
3910                                 port_array[0]->irq_level );
3911                 }
3912                 else {
3913                         port_array[0]->irq_requested = true;
3914                         adapter_test(port_array[0]);
3915                 }
3916         }
3917 }
3918
3919 static const struct tty_operations ops = {
3920         .open = open,
3921         .close = close,
3922         .write = write,
3923         .put_char = put_char,
3924         .flush_chars = flush_chars,
3925         .write_room = write_room,
3926         .chars_in_buffer = chars_in_buffer,
3927         .flush_buffer = flush_buffer,
3928         .ioctl = ioctl,
3929         .throttle = throttle,
3930         .unthrottle = unthrottle,
3931         .send_xchar = send_xchar,
3932         .break_ctl = set_break,
3933         .wait_until_sent = wait_until_sent,
3934         .read_proc = read_proc,
3935         .set_termios = set_termios,
3936         .stop = tx_hold,
3937         .start = tx_release,
3938         .hangup = hangup,
3939         .tiocmget = tiocmget,
3940         .tiocmset = tiocmset,
3941 };
3942
3943 static void synclinkmp_cleanup(void)
3944 {
3945         int rc;
3946         SLMP_INFO *info;
3947         SLMP_INFO *tmp;
3948
3949         printk("Unloading %s %s\n", driver_name, driver_version);
3950
3951         if (serial_driver) {
3952                 if ((rc = tty_unregister_driver(serial_driver)))
3953                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3954                                __FILE__,__LINE__,rc);
3955                 put_tty_driver(serial_driver);
3956         }
3957
3958         /* reset devices */
3959         info = synclinkmp_device_list;
3960         while(info) {
3961                 reset_port(info);
3962                 info = info->next_device;
3963         }
3964
3965         /* release devices */
3966         info = synclinkmp_device_list;
3967         while(info) {
3968 #if SYNCLINK_GENERIC_HDLC
3969                 hdlcdev_exit(info);
3970 #endif
3971                 free_dma_bufs(info);
3972                 free_tmp_rx_buf(info);
3973                 if ( info->port_num == 0 ) {
3974                         if (info->sca_base)
3975                                 write_reg(info, LPR, 1); /* set low power mode */
3976                         release_resources(info);
3977                 }
3978                 tmp = info;
3979                 info = info->next_device;
3980                 kfree(tmp);
3981         }
3982
3983         pci_unregister_driver(&synclinkmp_pci_driver);
3984 }
3985
3986 /* Driver initialization entry point.
3987  */
3988
3989 static int __init synclinkmp_init(void)
3990 {
3991         int rc;
3992
3993         if (break_on_load) {
3994                 synclinkmp_get_text_ptr();
3995                 BREAKPOINT();
3996         }
3997
3998         printk("%s %s\n", driver_name, driver_version);
3999
4000         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
4001                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4002                 return rc;
4003         }
4004
4005         serial_driver = alloc_tty_driver(128);
4006         if (!serial_driver) {
4007                 rc = -ENOMEM;
4008                 goto error;
4009         }
4010
4011         /* Initialize the tty_driver structure */
4012
4013         serial_driver->owner = THIS_MODULE;
4014         serial_driver->driver_name = "synclinkmp";
4015         serial_driver->name = "ttySLM";
4016         serial_driver->major = ttymajor;
4017         serial_driver->minor_start = 64;
4018         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4019         serial_driver->subtype = SERIAL_TYPE_NORMAL;
4020         serial_driver->init_termios = tty_std_termios;
4021         serial_driver->init_termios.c_cflag =
4022                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4023         serial_driver->init_termios.c_ispeed = 9600;
4024         serial_driver->init_termios.c_ospeed = 9600;
4025         serial_driver->flags = TTY_DRIVER_REAL_RAW;
4026         tty_set_operations(serial_driver, &ops);
4027         if ((rc = tty_register_driver(serial_driver)) < 0) {
4028                 printk("%s(%d):Couldn't register serial driver\n",
4029                         __FILE__,__LINE__);
4030                 put_tty_driver(serial_driver);
4031                 serial_driver = NULL;
4032                 goto error;
4033         }
4034
4035         printk("%s %s, tty major#%d\n",
4036                 driver_name, driver_version,
4037                 serial_driver->major);
4038
4039         return 0;
4040
4041 error:
4042         synclinkmp_cleanup();
4043         return rc;
4044 }
4045
4046 static void __exit synclinkmp_exit(void)
4047 {
4048         synclinkmp_cleanup();
4049 }
4050
4051 module_init(synclinkmp_init);
4052 module_exit(synclinkmp_exit);
4053
4054 /* Set the port for internal loopback mode.
4055  * The TxCLK and RxCLK signals are generated from the BRG and
4056  * the TxD is looped back to the RxD internally.
4057  */
4058 static void enable_loopback(SLMP_INFO *info, int enable)
4059 {
4060         if (enable) {
4061                 /* MD2 (Mode Register 2)
4062                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4063                  */
4064                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4065
4066                 /* degate external TxC clock source */
4067                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4068                 write_control_reg(info);
4069
4070                 /* RXS/TXS (Rx/Tx clock source)
4071                  * 07      Reserved, must be 0
4072                  * 06..04  Clock Source, 100=BRG
4073                  * 03..00  Clock Divisor, 0000=1
4074                  */
4075                 write_reg(info, RXS, 0x40);
4076                 write_reg(info, TXS, 0x40);
4077
4078         } else {
4079                 /* MD2 (Mode Register 2)
4080                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4081                  */
4082                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4083
4084                 /* RXS/TXS (Rx/Tx clock source)
4085                  * 07      Reserved, must be 0
4086                  * 06..04  Clock Source, 000=RxC/TxC Pin
4087                  * 03..00  Clock Divisor, 0000=1
4088                  */
4089                 write_reg(info, RXS, 0x00);
4090                 write_reg(info, TXS, 0x00);
4091         }
4092
4093         /* set LinkSpeed if available, otherwise default to 2Mbps */
4094         if (info->params.clock_speed)
4095                 set_rate(info, info->params.clock_speed);
4096         else
4097                 set_rate(info, 3686400);
4098 }
4099
4100 /* Set the baud rate register to the desired speed
4101  *
4102  *      data_rate       data rate of clock in bits per second
4103  *                      A data rate of 0 disables the AUX clock.
4104  */
4105 static void set_rate( SLMP_INFO *info, u32 data_rate )
4106 {
4107         u32 TMCValue;
4108         unsigned char BRValue;
4109         u32 Divisor=0;
4110
4111         /* fBRG = fCLK/(TMC * 2^BR)
4112          */
4113         if (data_rate != 0) {
4114                 Divisor = 14745600/data_rate;
4115                 if (!Divisor)
4116                         Divisor = 1;
4117
4118                 TMCValue = Divisor;
4119
4120                 BRValue = 0;
4121                 if (TMCValue != 1 && TMCValue != 2) {
4122                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4123                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4124                          * 50/50 duty cycle.
4125                          */
4126                         BRValue = 1;
4127                         TMCValue >>= 1;
4128                 }
4129
4130                 /* while TMCValue is too big for TMC register, divide
4131                  * by 2 and increment BR exponent.
4132                  */
4133                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4134                         TMCValue >>= 1;
4135
4136                 write_reg(info, TXS,
4137                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4138                 write_reg(info, RXS,
4139                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4140                 write_reg(info, TMC, (unsigned char)TMCValue);
4141         }
4142         else {
4143                 write_reg(info, TXS,0);
4144                 write_reg(info, RXS,0);
4145                 write_reg(info, TMC, 0);
4146         }
4147 }
4148
4149 /* Disable receiver
4150  */
4151 static void rx_stop(SLMP_INFO *info)
4152 {
4153         if (debug_level >= DEBUG_LEVEL_ISR)
4154                 printk("%s(%d):%s rx_stop()\n",
4155                          __FILE__,__LINE__, info->device_name );
4156
4157         write_reg(info, CMD, RXRESET);
4158
4159         info->ie0_value &= ~RXRDYE;
4160         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4161
4162         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4163         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4164         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4165
4166         info->rx_enabled = false;
4167         info->rx_overflow = false;
4168 }
4169
4170 /* enable the receiver
4171  */
4172 static void rx_start(SLMP_INFO *info)
4173 {
4174         int i;
4175
4176         if (debug_level >= DEBUG_LEVEL_ISR)
4177                 printk("%s(%d):%s rx_start()\n",
4178                          __FILE__,__LINE__, info->device_name );
4179
4180         write_reg(info, CMD, RXRESET);
4181
4182         if ( info->params.mode == MGSL_MODE_HDLC ) {
4183                 /* HDLC, disabe IRQ on rxdata */
4184                 info->ie0_value &= ~RXRDYE;
4185                 write_reg(info, IE0, info->ie0_value);
4186
4187                 /* Reset all Rx DMA buffers and program rx dma */
4188                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4189                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4190
4191                 for (i = 0; i < info->rx_buf_count; i++) {
4192                         info->rx_buf_list[i].status = 0xff;
4193
4194                         // throttle to 4 shared memory writes at a time to prevent
4195                         // hogging local bus (keep latency time for DMA requests low).
4196                         if (!(i % 4))
4197                                 read_status_reg(info);
4198                 }
4199                 info->current_rx_buf = 0;
4200
4201                 /* set current/1st descriptor address */
4202                 write_reg16(info, RXDMA + CDA,
4203                         info->rx_buf_list_ex[0].phys_entry);
4204
4205                 /* set new last rx descriptor address */
4206                 write_reg16(info, RXDMA + EDA,
4207                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4208
4209                 /* set buffer length (shared by all rx dma data buffers) */
4210                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4211
4212                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4213                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4214         } else {
4215                 /* async, enable IRQ on rxdata */
4216                 info->ie0_value |= RXRDYE;
4217                 write_reg(info, IE0, info->ie0_value);
4218         }
4219
4220         write_reg(info, CMD, RXENABLE);
4221
4222         info->rx_overflow = false;
4223         info->rx_enabled = true;
4224 }
4225
4226 /* Enable the transmitter and send a transmit frame if
4227  * one is loaded in the DMA buffers.
4228  */
4229 static void tx_start(SLMP_INFO *info)
4230 {
4231         if (debug_level >= DEBUG_LEVEL_ISR)
4232                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4233                          __FILE__,__LINE__, info->device_name,info->tx_count );
4234
4235         if (!info->tx_enabled ) {
4236                 write_reg(info, CMD, TXRESET);
4237                 write_reg(info, CMD, TXENABLE);
4238                 info->tx_enabled = true;
4239         }
4240
4241         if ( info->tx_count ) {
4242
4243                 /* If auto RTS enabled and RTS is inactive, then assert */
4244                 /* RTS and set a flag indicating that the driver should */
4245                 /* negate RTS when the transmission completes. */
4246
4247                 info->drop_rts_on_tx_done = false;
4248
4249                 if (info->params.mode != MGSL_MODE_ASYNC) {
4250
4251                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4252                                 get_signals( info );
4253                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4254                                         info->serial_signals |= SerialSignal_RTS;
4255                                         set_signals( info );
4256                                         info->drop_rts_on_tx_done = true;
4257                                 }
4258                         }
4259
4260                         write_reg16(info, TRC0,
4261                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4262
4263                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4264                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4265
4266                         /* set TX CDA (current descriptor address) */
4267                         write_reg16(info, TXDMA + CDA,
4268                                 info->tx_buf_list_ex[0].phys_entry);
4269
4270                         /* set TX EDA (last descriptor address) */
4271                         write_reg16(info, TXDMA + EDA,
4272                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4273
4274                         /* enable underrun IRQ */
4275                         info->ie1_value &= ~IDLE;
4276                         info->ie1_value |= UDRN;
4277                         write_reg(info, IE1, info->ie1_value);
4278                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4279
4280                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4281                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4282
4283                         mod_timer(&info->tx_timer, jiffies +
4284                                         msecs_to_jiffies(5000));
4285                 }
4286                 else {
4287                         tx_load_fifo(info);
4288                         /* async, enable IRQ on txdata */
4289                         info->ie0_value |= TXRDYE;
4290                         write_reg(info, IE0, info->ie0_value);
4291                 }
4292
4293                 info->tx_active = true;
4294         }
4295 }
4296
4297 /* stop the transmitter and DMA
4298  */
4299 static void tx_stop( SLMP_INFO *info )
4300 {
4301         if (debug_level >= DEBUG_LEVEL_ISR)
4302                 printk("%s(%d):%s tx_stop()\n",
4303                          __FILE__,__LINE__, info->device_name );
4304
4305         del_timer(&info->tx_timer);
4306
4307         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4308         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4309
4310         write_reg(info, CMD, TXRESET);
4311
4312         info->ie1_value &= ~(UDRN + IDLE);
4313         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4314         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4315
4316         info->ie0_value &= ~TXRDYE;
4317         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4318
4319         info->tx_enabled = false;
4320         info->tx_active = false;
4321 }
4322
4323 /* Fill the transmit FIFO until the FIFO is full or
4324  * there is no more data to load.
4325  */
4326 static void tx_load_fifo(SLMP_INFO *info)
4327 {
4328         u8 TwoBytes[2];
4329
4330         /* do nothing is now tx data available and no XON/XOFF pending */
4331
4332         if ( !info->tx_count && !info->x_char )
4333                 return;
4334
4335         /* load the Transmit FIFO until FIFOs full or all data sent */
4336
4337         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4338
4339                 /* there is more space in the transmit FIFO and */
4340                 /* there is more data in transmit buffer */
4341
4342                 if ( (info->tx_count > 1) && !info->x_char ) {
4343                         /* write 16-bits */
4344                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4345                         if (info->tx_get >= info->max_frame_size)
4346                                 info->tx_get -= info->max_frame_size;
4347                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4348                         if (info->tx_get >= info->max_frame_size)
4349                                 info->tx_get -= info->max_frame_size;
4350
4351                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4352
4353                         info->tx_count -= 2;
4354                         info->icount.tx += 2;
4355                 } else {
4356                         /* only 1 byte left to transmit or 1 FIFO slot left */
4357
4358                         if (info->x_char) {
4359                                 /* transmit pending high priority char */
4360                                 write_reg(info, TRB, info->x_char);
4361                                 info->x_char = 0;
4362                         } else {
4363                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4364                                 if (info->tx_get >= info->max_frame_size)
4365                                         info->tx_get -= info->max_frame_size;
4366                                 info->tx_count--;
4367                         }
4368                         info->icount.tx++;
4369                 }
4370         }
4371 }
4372
4373 /* Reset a port to a known state
4374  */
4375 static void reset_port(SLMP_INFO *info)
4376 {
4377         if (info->sca_base) {
4378
4379                 tx_stop(info);
4380                 rx_stop(info);
4381
4382                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4383                 set_signals(info);
4384
4385                 /* disable all port interrupts */
4386                 info->ie0_value = 0;
4387                 info->ie1_value = 0;
4388                 info->ie2_value = 0;
4389                 write_reg(info, IE0, info->ie0_value);
4390                 write_reg(info, IE1, info->ie1_value);
4391                 write_reg(info, IE2, info->ie2_value);
4392
4393                 write_reg(info, CMD, CHRESET);
4394         }
4395 }
4396
4397 /* Reset all the ports to a known state.
4398  */
4399 static void reset_adapter(SLMP_INFO *info)
4400 {
4401         int i;
4402
4403         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4404                 if (info->port_array[i])
4405                         reset_port(info->port_array[i]);
4406         }
4407 }
4408
4409 /* Program port for asynchronous communications.
4410  */
4411 static void async_mode(SLMP_INFO *info)
4412 {
4413
4414         unsigned char RegValue;
4415
4416         tx_stop(info);
4417         rx_stop(info);
4418
4419         /* MD0, Mode Register 0
4420          *
4421          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4422          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4423          * 03      Reserved, must be 0
4424          * 02      CRCCC, CRC Calculation, 0=disabled
4425          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4426          *
4427          * 0000 0000
4428          */
4429         RegValue = 0x00;
4430         if (info->params.stop_bits != 1)
4431                 RegValue |= BIT1;
4432         write_reg(info, MD0, RegValue);
4433
4434         /* MD1, Mode Register 1
4435          *
4436          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4437          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4438          * 03..02  RXCHR<1..0>, rx char size
4439          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4440          *
4441          * 0100 0000
4442          */
4443         RegValue = 0x40;
4444         switch (info->params.data_bits) {
4445         case 7: RegValue |= BIT4 + BIT2; break;
4446         case 6: RegValue |= BIT5 + BIT3; break;
4447         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4448         }
4449         if (info->params.parity != ASYNC_PARITY_NONE) {
4450                 RegValue |= BIT1;
4451                 if (info->params.parity == ASYNC_PARITY_ODD)
4452                         RegValue |= BIT0;
4453         }
4454         write_reg(info, MD1, RegValue);
4455
4456         /* MD2, Mode Register 2
4457          *
4458          * 07..02  Reserved, must be 0
4459          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4460          *
4461          * 0000 0000
4462          */
4463         RegValue = 0x00;
4464         if (info->params.loopback)
4465                 RegValue |= (BIT1 + BIT0);
4466         write_reg(info, MD2, RegValue);
4467
4468         /* RXS, Receive clock source
4469          *
4470          * 07      Reserved, must be 0
4471          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4472          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4473          */
4474         RegValue=BIT6;
4475         write_reg(info, RXS, RegValue);
4476
4477         /* TXS, Transmit clock source
4478          *
4479          * 07      Reserved, must be 0
4480          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4481          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4482          */
4483         RegValue=BIT6;
4484         write_reg(info, TXS, RegValue);
4485
4486         /* Control Register
4487          *
4488          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4489          */
4490         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4491         write_control_reg(info);
4492
4493         tx_set_idle(info);
4494
4495         /* RRC Receive Ready Control 0
4496          *
4497          * 07..05  Reserved, must be 0
4498          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4499          */
4500         write_reg(info, RRC, 0x00);
4501
4502         /* TRC0 Transmit Ready Control 0
4503          *
4504          * 07..05  Reserved, must be 0
4505          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4506          */
4507         write_reg(info, TRC0, 0x10);
4508
4509         /* TRC1 Transmit Ready Control 1
4510          *
4511          * 07..05  Reserved, must be 0
4512          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4513          */
4514         write_reg(info, TRC1, 0x1e);
4515
4516         /* CTL, MSCI control register
4517          *
4518          * 07..06  Reserved, set to 0
4519          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4520          * 04      IDLC, idle control, 0=mark 1=idle register
4521          * 03      BRK, break, 0=off 1 =on (async)
4522          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4523          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4524          * 00      RTS, RTS output control, 0=active 1=inactive
4525          *
4526          * 0001 0001
4527          */
4528         RegValue = 0x10;
4529         if (!(info->serial_signals & SerialSignal_RTS))
4530                 RegValue |= 0x01;
4531         write_reg(info, CTL, RegValue);
4532
4533         /* enable status interrupts */
4534         info->ie0_value |= TXINTE + RXINTE;
4535         write_reg(info, IE0, info->ie0_value);
4536
4537         /* enable break detect interrupt */
4538         info->ie1_value = BRKD;
4539         write_reg(info, IE1, info->ie1_value);
4540
4541         /* enable rx overrun interrupt */
4542         info->ie2_value = OVRN;
4543         write_reg(info, IE2, info->ie2_value);
4544
4545         set_rate( info, info->params.data_rate * 16 );
4546 }
4547
4548 /* Program the SCA for HDLC communications.
4549  */
4550 static void hdlc_mode(SLMP_INFO *info)
4551 {
4552         unsigned char RegValue;
4553         u32 DpllDivisor;
4554
4555         // Can't use DPLL because SCA outputs recovered clock on RxC when
4556         // DPLL mode selected. This causes output contention with RxC receiver.
4557         // Use of DPLL would require external hardware to disable RxC receiver
4558         // when DPLL mode selected.
4559         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4560
4561         /* disable DMA interrupts */
4562         write_reg(info, TXDMA + DIR, 0);
4563         write_reg(info, RXDMA + DIR, 0);
4564
4565         /* MD0, Mode Register 0
4566          *
4567          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4568          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4569          * 03      Reserved, must be 0
4570          * 02      CRCCC, CRC Calculation, 1=enabled
4571          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4572          * 00      CRC0, CRC initial value, 1 = all 1s
4573          *
4574          * 1000 0001
4575          */
4576         RegValue = 0x81;
4577         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4578                 RegValue |= BIT4;
4579         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4580                 RegValue |= BIT4;
4581         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4582                 RegValue |= BIT2 + BIT1;
4583         write_reg(info, MD0, RegValue);
4584
4585         /* MD1, Mode Register 1
4586          *
4587          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4588          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4589          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4590          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4591          *
4592          * 0000 0000
4593          */
4594         RegValue = 0x00;
4595         write_reg(info, MD1, RegValue);
4596
4597         /* MD2, Mode Register 2
4598          *
4599          * 07      NRZFM, 0=NRZ, 1=FM
4600          * 06..05  CODE<1..0> Encoding, 00=NRZ
4601          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4602          * 02      Reserved, must be 0
4603          * 01..00  CNCT<1..0> Channel connection, 0=normal
4604          *
4605          * 0000 0000
4606          */
4607         RegValue = 0x00;
4608         switch(info->params.encoding) {
4609         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4610         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4611         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4612         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4613 #if 0
4614         case HDLC_ENCODING_NRZB:                                        /* not supported */
4615         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4616         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4617 #endif
4618         }
4619         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4620                 DpllDivisor = 16;
4621                 RegValue |= BIT3;
4622         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4623                 DpllDivisor = 8;
4624         } else {
4625                 DpllDivisor = 32;
4626                 RegValue |= BIT4;
4627         }
4628         write_reg(info, MD2, RegValue);
4629
4630
4631         /* RXS, Receive clock source
4632          *
4633          * 07      Reserved, must be 0
4634          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4635          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4636          */
4637         RegValue=0;
4638         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4639                 RegValue |= BIT6;
4640         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4641                 RegValue |= BIT6 + BIT5;
4642         write_reg(info, RXS, RegValue);
4643
4644         /* TXS, Transmit clock source
4645          *
4646          * 07      Reserved, must be 0
4647          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4648          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4649          */
4650         RegValue=0;
4651         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4652                 RegValue |= BIT6;
4653         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4654                 RegValue |= BIT6 + BIT5;
4655         write_reg(info, TXS, RegValue);
4656
4657         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4658                 set_rate(info, info->params.clock_speed * DpllDivisor);
4659         else
4660                 set_rate(info, info->params.clock_speed);
4661
4662         /* GPDATA (General Purpose I/O Data Register)
4663          *
4664          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4665          */
4666         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4667                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4668         else
4669                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4670         write_control_reg(info);
4671
4672         /* RRC Receive Ready Control 0
4673          *
4674          * 07..05  Reserved, must be 0
4675          * 04..00  RRC<4..0> Rx FIFO trigger active
4676          */
4677         write_reg(info, RRC, rx_active_fifo_level);
4678
4679         /* TRC0 Transmit Ready Control 0
4680          *
4681          * 07..05  Reserved, must be 0
4682          * 04..00  TRC<4..0> Tx FIFO trigger active
4683          */
4684         write_reg(info, TRC0, tx_active_fifo_level);
4685
4686         /* TRC1 Transmit Ready Control 1
4687          *
4688          * 07..05  Reserved, must be 0
4689          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4690          */
4691         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4692
4693         /* DMR, DMA Mode Register
4694          *
4695          * 07..05  Reserved, must be 0
4696          * 04      TMOD, Transfer Mode: 1=chained-block
4697          * 03      Reserved, must be 0
4698          * 02      NF, Number of Frames: 1=multi-frame
4699          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4700          * 00      Reserved, must be 0
4701          *
4702          * 0001 0100
4703          */
4704         write_reg(info, TXDMA + DMR, 0x14);
4705         write_reg(info, RXDMA + DMR, 0x14);
4706
4707         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4708         write_reg(info, RXDMA + CPB,
4709                 (unsigned char)(info->buffer_list_phys >> 16));
4710
4711         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4712         write_reg(info, TXDMA + CPB,
4713                 (unsigned char)(info->buffer_list_phys >> 16));
4714
4715         /* enable status interrupts. other code enables/disables
4716          * the individual sources for these two interrupt classes.
4717          */
4718         info->ie0_value |= TXINTE + RXINTE;
4719         write_reg(info, IE0, info->ie0_value);
4720
4721         /* CTL, MSCI control register
4722          *
4723          * 07..06  Reserved, set to 0
4724          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4725          * 04      IDLC, idle control, 0=mark 1=idle register
4726          * 03      BRK, break, 0=off 1 =on (async)
4727          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4728          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4729          * 00      RTS, RTS output control, 0=active 1=inactive
4730          *
4731          * 0001 0001
4732          */
4733         RegValue = 0x10;
4734         if (!(info->serial_signals & SerialSignal_RTS))
4735                 RegValue |= 0x01;
4736         write_reg(info, CTL, RegValue);
4737
4738         /* preamble not supported ! */
4739
4740         tx_set_idle(info);
4741         tx_stop(info);
4742         rx_stop(info);
4743
4744         set_rate(info, info->params.clock_speed);
4745
4746         if (info->params.loopback)
4747                 enable_loopback(info,1);
4748 }
4749
4750 /* Set the transmit HDLC idle mode
4751  */
4752 static void tx_set_idle(SLMP_INFO *info)
4753 {
4754         unsigned char RegValue = 0xff;
4755
4756         /* Map API idle mode to SCA register bits */
4757         switch(info->idle_mode) {
4758         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4759         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4760         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4761         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4762         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4763         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4764         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4765         }
4766
4767         write_reg(info, IDL, RegValue);
4768 }
4769
4770 /* Query the adapter for the state of the V24 status (input) signals.
4771  */
4772 static void get_signals(SLMP_INFO *info)
4773 {
4774         u16 status = read_reg(info, SR3);
4775         u16 gpstatus = read_status_reg(info);
4776         u16 testbit;
4777
4778         /* clear all serial signals except DTR and RTS */
4779         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4780
4781         /* set serial signal bits to reflect MISR */
4782
4783         if (!(status & BIT3))
4784                 info->serial_signals |= SerialSignal_CTS;
4785
4786         if ( !(status & BIT2))
4787                 info->serial_signals |= SerialSignal_DCD;
4788
4789         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4790         if (!(gpstatus & testbit))
4791                 info->serial_signals |= SerialSignal_RI;
4792
4793         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4794         if (!(gpstatus & testbit))
4795                 info->serial_signals |= SerialSignal_DSR;
4796 }
4797
4798 /* Set the state of DTR and RTS based on contents of
4799  * serial_signals member of device context.
4800  */
4801 static void set_signals(SLMP_INFO *info)
4802 {
4803         unsigned char RegValue;
4804         u16 EnableBit;
4805
4806         RegValue = read_reg(info, CTL);
4807         if (info->serial_signals & SerialSignal_RTS)
4808                 RegValue &= ~BIT0;
4809         else
4810                 RegValue |= BIT0;
4811         write_reg(info, CTL, RegValue);
4812
4813         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4814         EnableBit = BIT1 << (info->port_num*2);
4815         if (info->serial_signals & SerialSignal_DTR)
4816                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4817         else
4818                 info->port_array[0]->ctrlreg_value |= EnableBit;
4819         write_control_reg(info);
4820 }
4821
4822 /*******************/
4823 /* DMA Buffer Code */
4824 /*******************/
4825
4826 /* Set the count for all receive buffers to SCABUFSIZE
4827  * and set the current buffer to the first buffer. This effectively
4828  * makes all buffers free and discards any data in buffers.
4829  */
4830 static void rx_reset_buffers(SLMP_INFO *info)
4831 {
4832         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4833 }
4834
4835 /* Free the buffers used by a received frame
4836  *
4837  * info   pointer to device instance data
4838  * first  index of 1st receive buffer of frame
4839  * last   index of last receive buffer of frame
4840  */
4841 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4842 {
4843         bool done = false;
4844
4845         while(!done) {
4846                 /* reset current buffer for reuse */
4847                 info->rx_buf_list[first].status = 0xff;
4848
4849                 if (first == last) {
4850                         done = true;
4851                         /* set new last rx descriptor address */
4852                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4853                 }
4854
4855                 first++;
4856                 if (first == info->rx_buf_count)
4857                         first = 0;
4858         }
4859
4860         /* set current buffer to next buffer after last buffer of frame */
4861         info->current_rx_buf = first;
4862 }
4863
4864 /* Return a received frame from the receive DMA buffers.
4865  * Only frames received without errors are returned.
4866  *
4867  * Return Value:        true if frame returned, otherwise false
4868  */
4869 static bool rx_get_frame(SLMP_INFO *info)
4870 {
4871         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4872         unsigned short status;
4873         unsigned int framesize = 0;
4874         bool ReturnCode = false;
4875         unsigned long flags;
4876         struct tty_struct *tty = info->port.tty;
4877         unsigned char addr_field = 0xff;
4878         SCADESC *desc;
4879         SCADESC_EX *desc_ex;
4880
4881 CheckAgain:
4882         /* assume no frame returned, set zero length */
4883         framesize = 0;
4884         addr_field = 0xff;
4885
4886         /*
4887          * current_rx_buf points to the 1st buffer of the next available
4888          * receive frame. To find the last buffer of the frame look for
4889          * a non-zero status field in the buffer entries. (The status
4890          * field is set by the 16C32 after completing a receive frame.
4891          */
4892         StartIndex = EndIndex = info->current_rx_buf;
4893
4894         for ( ;; ) {
4895                 desc = &info->rx_buf_list[EndIndex];
4896                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4897
4898                 if (desc->status == 0xff)
4899                         goto Cleanup;   /* current desc still in use, no frames available */
4900
4901                 if (framesize == 0 && info->params.addr_filter != 0xff)
4902                         addr_field = desc_ex->virt_addr[0];
4903
4904                 framesize += desc->length;
4905
4906                 /* Status != 0 means last buffer of frame */
4907                 if (desc->status)
4908                         break;
4909
4910                 EndIndex++;
4911                 if (EndIndex == info->rx_buf_count)
4912                         EndIndex = 0;
4913
4914                 if (EndIndex == info->current_rx_buf) {
4915                         /* all buffers have been 'used' but none mark      */
4916                         /* the end of a frame. Reset buffers and receiver. */
4917                         if ( info->rx_enabled ){
4918                                 spin_lock_irqsave(&info->lock,flags);
4919                                 rx_start(info);
4920                                 spin_unlock_irqrestore(&info->lock,flags);
4921                         }
4922                         goto Cleanup;
4923                 }
4924
4925         }
4926
4927         /* check status of receive frame */
4928
4929         /* frame status is byte stored after frame data
4930          *
4931          * 7 EOM (end of msg), 1 = last buffer of frame
4932          * 6 Short Frame, 1 = short frame
4933          * 5 Abort, 1 = frame aborted
4934          * 4 Residue, 1 = last byte is partial
4935          * 3 Overrun, 1 = overrun occurred during frame reception
4936          * 2 CRC,     1 = CRC error detected
4937          *
4938          */
4939         status = desc->status;
4940
4941         /* ignore CRC bit if not using CRC (bit is undefined) */
4942         /* Note:CRC is not save to data buffer */
4943         if (info->params.crc_type == HDLC_CRC_NONE)
4944                 status &= ~BIT2;
4945
4946         if (framesize == 0 ||
4947                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4948                 /* discard 0 byte frames, this seems to occur sometime
4949                  * when remote is idling flags.
4950                  */
4951                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4952                 goto CheckAgain;
4953         }
4954
4955         if (framesize < 2)
4956                 status |= BIT6;
4957
4958         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4959                 /* received frame has errors,
4960                  * update counts and mark frame size as 0
4961                  */
4962                 if (status & BIT6)
4963                         info->icount.rxshort++;
4964                 else if (status & BIT5)
4965                         info->icount.rxabort++;
4966                 else if (status & BIT3)
4967                         info->icount.rxover++;
4968                 else
4969                         info->icount.rxcrc++;
4970
4971                 framesize = 0;
4972 #if SYNCLINK_GENERIC_HDLC
4973                 {
4974                         info->netdev->stats.rx_errors++;
4975                         info->netdev->stats.rx_frame_errors++;
4976                 }
4977 #endif
4978         }
4979
4980         if ( debug_level >= DEBUG_LEVEL_BH )
4981                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4982                         __FILE__,__LINE__,info->device_name,status,framesize);
4983
4984         if ( debug_level >= DEBUG_LEVEL_DATA )
4985                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4986                         min_t(int, framesize,SCABUFSIZE),0);
4987
4988         if (framesize) {
4989                 if (framesize > info->max_frame_size)
4990                         info->icount.rxlong++;
4991                 else {
4992                         /* copy dma buffer(s) to contiguous intermediate buffer */
4993                         int copy_count = framesize;
4994                         int index = StartIndex;
4995                         unsigned char *ptmp = info->tmp_rx_buf;
4996                         info->tmp_rx_buf_count = framesize;
4997
4998                         info->icount.rxok++;
4999
5000                         while(copy_count) {
5001                                 int partial_count = min(copy_count,SCABUFSIZE);
5002                                 memcpy( ptmp,
5003                                         info->rx_buf_list_ex[index].virt_addr,
5004                                         partial_count );
5005                                 ptmp += partial_count;
5006                                 copy_count -= partial_count;
5007
5008                                 if ( ++index == info->rx_buf_count )
5009                                         index = 0;
5010                         }
5011
5012 #if SYNCLINK_GENERIC_HDLC
5013                         if (info->netcount)
5014                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
5015                         else
5016 #endif
5017                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
5018                                                   info->flag_buf, framesize);
5019                 }
5020         }
5021         /* Free the buffers used by this frame. */
5022         rx_free_frame_buffers( info, StartIndex, EndIndex );
5023
5024         ReturnCode = true;
5025
5026 Cleanup:
5027         if ( info->rx_enabled && info->rx_overflow ) {
5028                 /* Receiver is enabled, but needs to restarted due to
5029                  * rx buffer overflow. If buffers are empty, restart receiver.
5030                  */
5031                 if (info->rx_buf_list[EndIndex].status == 0xff) {
5032                         spin_lock_irqsave(&info->lock,flags);
5033                         rx_start(info);
5034                         spin_unlock_irqrestore(&info->lock,flags);
5035                 }
5036         }
5037
5038         return ReturnCode;
5039 }
5040
5041 /* load the transmit DMA buffer with data
5042  */
5043 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5044 {
5045         unsigned short copy_count;
5046         unsigned int i = 0;
5047         SCADESC *desc;
5048         SCADESC_EX *desc_ex;
5049
5050         if ( debug_level >= DEBUG_LEVEL_DATA )
5051                 trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
5052
5053         /* Copy source buffer to one or more DMA buffers, starting with
5054          * the first transmit dma buffer.
5055          */
5056         for(i=0;;)
5057         {
5058                 copy_count = min_t(unsigned short,count,SCABUFSIZE);
5059
5060                 desc = &info->tx_buf_list[i];
5061                 desc_ex = &info->tx_buf_list_ex[i];
5062
5063                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5064
5065                 desc->length = copy_count;
5066                 desc->status = 0;
5067
5068                 buf += copy_count;
5069                 count -= copy_count;
5070
5071                 if (!count)
5072                         break;
5073
5074                 i++;
5075                 if (i >= info->tx_buf_count)
5076                         i = 0;
5077         }
5078
5079         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5080         info->last_tx_buf = ++i;
5081 }
5082
5083 static bool register_test(SLMP_INFO *info)
5084 {
5085         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5086         static unsigned int count = ARRAY_SIZE(testval);
5087         unsigned int i;
5088         bool rc = true;
5089         unsigned long flags;
5090
5091         spin_lock_irqsave(&info->lock,flags);
5092         reset_port(info);
5093
5094         /* assume failure */
5095         info->init_error = DiagStatus_AddressFailure;
5096
5097         /* Write bit patterns to various registers but do it out of */
5098         /* sync, then read back and verify values. */
5099
5100         for (i = 0 ; i < count ; i++) {
5101                 write_reg(info, TMC, testval[i]);
5102                 write_reg(info, IDL, testval[(i+1)%count]);
5103                 write_reg(info, SA0, testval[(i+2)%count]);
5104                 write_reg(info, SA1, testval[(i+3)%count]);
5105
5106                 if ( (read_reg(info, TMC) != testval[i]) ||
5107                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5108                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5109                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5110                 {
5111                         rc = false;
5112                         break;
5113                 }
5114         }
5115
5116         reset_port(info);
5117         spin_unlock_irqrestore(&info->lock,flags);
5118
5119         return rc;
5120 }
5121
5122 static bool irq_test(SLMP_INFO *info)
5123 {
5124         unsigned long timeout;
5125         unsigned long flags;
5126
5127         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5128
5129         spin_lock_irqsave(&info->lock,flags);
5130         reset_port(info);
5131
5132         /* assume failure */
5133         info->init_error = DiagStatus_IrqFailure;
5134         info->irq_occurred = false;
5135
5136         /* setup timer0 on SCA0 to interrupt */
5137
5138         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5139         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5140
5141         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5142         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5143
5144
5145         /* TMCS, Timer Control/Status Register
5146          *
5147          * 07      CMF, Compare match flag (read only) 1=match
5148          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5149          * 05      Reserved, must be 0
5150          * 04      TME, Timer Enable
5151          * 03..00  Reserved, must be 0
5152          *
5153          * 0101 0000
5154          */
5155         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5156
5157         spin_unlock_irqrestore(&info->lock,flags);
5158
5159         timeout=100;
5160         while( timeout-- && !info->irq_occurred ) {
5161                 msleep_interruptible(10);
5162         }
5163
5164         spin_lock_irqsave(&info->lock,flags);
5165         reset_port(info);
5166         spin_unlock_irqrestore(&info->lock,flags);
5167
5168         return info->irq_occurred;
5169 }
5170
5171 /* initialize individual SCA device (2 ports)
5172  */
5173 static bool sca_init(SLMP_INFO *info)
5174 {
5175         /* set wait controller to single mem partition (low), no wait states */
5176         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5177         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5178         write_reg(info, WCRL, 0);       /* wait controller low range */
5179         write_reg(info, WCRM, 0);       /* wait controller mid range */
5180         write_reg(info, WCRH, 0);       /* wait controller high range */
5181
5182         /* DPCR, DMA Priority Control
5183          *
5184          * 07..05  Not used, must be 0
5185          * 04      BRC, bus release condition: 0=all transfers complete
5186          * 03      CCC, channel change condition: 0=every cycle
5187          * 02..00  PR<2..0>, priority 100=round robin
5188          *
5189          * 00000100 = 0x04
5190          */
5191         write_reg(info, DPCR, dma_priority);
5192
5193         /* DMA Master Enable, BIT7: 1=enable all channels */
5194         write_reg(info, DMER, 0x80);
5195
5196         /* enable all interrupt classes */
5197         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5198         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5199         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5200
5201         /* ITCR, interrupt control register
5202          * 07      IPC, interrupt priority, 0=MSCI->DMA
5203          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5204          * 04      VOS, Vector Output, 0=unmodified vector
5205          * 03..00  Reserved, must be 0
5206          */
5207         write_reg(info, ITCR, 0);
5208
5209         return true;
5210 }
5211
5212 /* initialize adapter hardware
5213  */
5214 static bool init_adapter(SLMP_INFO *info)
5215 {
5216         int i;
5217
5218         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5219         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5220         u32 readval;
5221
5222         info->misc_ctrl_value |= BIT30;
5223         *MiscCtrl = info->misc_ctrl_value;
5224
5225         /*
5226          * Force at least 170ns delay before clearing
5227          * reset bit. Each read from LCR takes at least
5228          * 30ns so 10 times for 300ns to be safe.
5229          */
5230         for(i=0;i<10;i++)
5231                 readval = *MiscCtrl;
5232
5233         info->misc_ctrl_value &= ~BIT30;
5234         *MiscCtrl = info->misc_ctrl_value;
5235
5236         /* init control reg (all DTRs off, all clksel=input) */
5237         info->ctrlreg_value = 0xaa;
5238         write_control_reg(info);
5239
5240         {
5241                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5242                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5243
5244                 switch(read_ahead_count)
5245                 {
5246                 case 16:
5247                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5248                         break;
5249                 case 8:
5250                         lcr1_brdr_value |= BIT5 + BIT4;
5251                         break;
5252                 case 4:
5253                         lcr1_brdr_value |= BIT5 + BIT3;
5254                         break;
5255                 case 0:
5256                         lcr1_brdr_value |= BIT5;
5257                         break;
5258                 }
5259
5260                 *LCR1BRDR = lcr1_brdr_value;
5261                 *MiscCtrl = misc_ctrl_value;
5262         }
5263
5264         sca_init(info->port_array[0]);
5265         sca_init(info->port_array[2]);
5266
5267         return true;
5268 }
5269
5270 /* Loopback an HDLC frame to test the hardware
5271  * interrupt and DMA functions.
5272  */
5273 static bool loopback_test(SLMP_INFO *info)
5274 {
5275 #define TESTFRAMESIZE 20
5276
5277         unsigned long timeout;
5278         u16 count = TESTFRAMESIZE;
5279         unsigned char buf[TESTFRAMESIZE];
5280         bool rc = false;
5281         unsigned long flags;
5282
5283         struct tty_struct *oldtty = info->port.tty;
5284         u32 speed = info->params.clock_speed;
5285
5286         info->params.clock_speed = 3686400;
5287         info->port.tty = NULL;
5288
5289         /* assume failure */
5290         info->init_error = DiagStatus_DmaFailure;
5291
5292         /* build and send transmit frame */
5293         for (count = 0; count < TESTFRAMESIZE;++count)
5294                 buf[count] = (unsigned char)count;
5295
5296         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5297
5298         /* program hardware for HDLC and enabled receiver */
5299         spin_lock_irqsave(&info->lock,flags);
5300         hdlc_mode(info);
5301         enable_loopback(info,1);
5302         rx_start(info);
5303         info->tx_count = count;
5304         tx_load_dma_buffer(info,buf,count);
5305         tx_start(info);
5306         spin_unlock_irqrestore(&info->lock,flags);
5307
5308         /* wait for receive complete */
5309         /* Set a timeout for waiting for interrupt. */
5310         for ( timeout = 100; timeout; --timeout ) {
5311                 msleep_interruptible(10);
5312
5313                 if (rx_get_frame(info)) {
5314                         rc = true;
5315                         break;
5316                 }
5317         }
5318
5319         /* verify received frame length and contents */
5320         if (rc &&
5321             ( info->tmp_rx_buf_count != count ||
5322               memcmp(buf, info->tmp_rx_buf,count))) {
5323                 rc = false;
5324         }
5325
5326         spin_lock_irqsave(&info->lock,flags);
5327         reset_adapter(info);
5328         spin_unlock_irqrestore(&info->lock,flags);
5329
5330         info->params.clock_speed = speed;
5331         info->port.tty = oldtty;
5332
5333         return rc;
5334 }
5335
5336 /* Perform diagnostics on hardware
5337  */
5338 static int adapter_test( SLMP_INFO *info )
5339 {
5340         unsigned long flags;
5341         if ( debug_level >= DEBUG_LEVEL_INFO )
5342                 printk( "%s(%d):Testing device %s\n",
5343                         __FILE__,__LINE__,info->device_name );
5344
5345         spin_lock_irqsave(&info->lock,flags);
5346         init_adapter(info);
5347         spin_unlock_irqrestore(&info->lock,flags);
5348
5349         info->port_array[0]->port_count = 0;
5350
5351         if ( register_test(info->port_array[0]) &&
5352                 register_test(info->port_array[1])) {
5353
5354                 info->port_array[0]->port_count = 2;
5355
5356                 if ( register_test(info->port_array[2]) &&
5357                         register_test(info->port_array[3]) )
5358                         info->port_array[0]->port_count += 2;
5359         }
5360         else {
5361                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5362                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5363                 return -ENODEV;
5364         }
5365
5366         if ( !irq_test(info->port_array[0]) ||
5367                 !irq_test(info->port_array[1]) ||
5368                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5369                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5370                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5371                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5372                 return -ENODEV;
5373         }
5374
5375         if (!loopback_test(info->port_array[0]) ||
5376                 !loopback_test(info->port_array[1]) ||
5377                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5378                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5379                 printk( "%s(%d):DMA test failure for device %s\n",
5380                         __FILE__,__LINE__,info->device_name);
5381                 return -ENODEV;
5382         }
5383
5384         if ( debug_level >= DEBUG_LEVEL_INFO )
5385                 printk( "%s(%d):device %s passed diagnostics\n",
5386                         __FILE__,__LINE__,info->device_name );
5387
5388         info->port_array[0]->init_error = 0;
5389         info->port_array[1]->init_error = 0;
5390         if ( info->port_count > 2 ) {
5391                 info->port_array[2]->init_error = 0;
5392                 info->port_array[3]->init_error = 0;
5393         }
5394
5395         return 0;
5396 }
5397
5398 /* Test the shared memory on a PCI adapter.
5399  */
5400 static bool memory_test(SLMP_INFO *info)
5401 {
5402         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5403                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5404         unsigned long count = ARRAY_SIZE(testval);
5405         unsigned long i;
5406         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5407         unsigned long * addr = (unsigned long *)info->memory_base;
5408
5409         /* Test data lines with test pattern at one location. */
5410
5411         for ( i = 0 ; i < count ; i++ ) {
5412                 *addr = testval[i];
5413                 if ( *addr != testval[i] )
5414                         return false;
5415         }
5416
5417         /* Test address lines with incrementing pattern over */
5418         /* entire address range. */
5419
5420         for ( i = 0 ; i < limit ; i++ ) {
5421                 *addr = i * 4;
5422                 addr++;
5423         }
5424
5425         addr = (unsigned long *)info->memory_base;
5426
5427         for ( i = 0 ; i < limit ; i++ ) {
5428                 if ( *addr != i * 4 )
5429                         return false;
5430                 addr++;
5431         }
5432
5433         memset( info->memory_base, 0, SCA_MEM_SIZE );
5434         return true;
5435 }
5436
5437 /* Load data into PCI adapter shared memory.
5438  *
5439  * The PCI9050 releases control of the local bus
5440  * after completing the current read or write operation.
5441  *
5442  * While the PCI9050 write FIFO not empty, the
5443  * PCI9050 treats all of the writes as a single transaction
5444  * and does not release the bus. This causes DMA latency problems
5445  * at high speeds when copying large data blocks to the shared memory.
5446  *
5447  * This function breaks a write into multiple transations by
5448  * interleaving a read which flushes the write FIFO and 'completes'
5449  * the write transation. This allows any pending DMA request to gain control
5450  * of the local bus in a timely fasion.
5451  */
5452 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5453 {
5454         /* A load interval of 16 allows for 4 32-bit writes at */
5455         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5456
5457         unsigned short interval = count / sca_pci_load_interval;
5458         unsigned short i;
5459
5460         for ( i = 0 ; i < interval ; i++ )
5461         {
5462                 memcpy(dest, src, sca_pci_load_interval);
5463                 read_status_reg(info);
5464                 dest += sca_pci_load_interval;
5465                 src += sca_pci_load_interval;
5466         }
5467
5468         memcpy(dest, src, count % sca_pci_load_interval);
5469 }
5470
5471 static void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5472 {
5473         int i;
5474         int linecount;
5475         if (xmit)
5476                 printk("%s tx data:\n",info->device_name);
5477         else
5478                 printk("%s rx data:\n",info->device_name);
5479
5480         while(count) {
5481                 if (count > 16)
5482                         linecount = 16;
5483                 else
5484                         linecount = count;
5485
5486                 for(i=0;i<linecount;i++)
5487                         printk("%02X ",(unsigned char)data[i]);
5488                 for(;i<17;i++)
5489                         printk("   ");
5490                 for(i=0;i<linecount;i++) {
5491                         if (data[i]>=040 && data[i]<=0176)
5492                                 printk("%c",data[i]);
5493                         else
5494                                 printk(".");
5495                 }
5496                 printk("\n");
5497
5498                 data  += linecount;
5499                 count -= linecount;
5500         }
5501 }       /* end of trace_block() */
5502
5503 /* called when HDLC frame times out
5504  * update stats and do tx completion processing
5505  */
5506 static void tx_timeout(unsigned long context)
5507 {
5508         SLMP_INFO *info = (SLMP_INFO*)context;
5509         unsigned long flags;
5510
5511         if ( debug_level >= DEBUG_LEVEL_INFO )
5512                 printk( "%s(%d):%s tx_timeout()\n",
5513                         __FILE__,__LINE__,info->device_name);
5514         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5515                 info->icount.txtimeout++;
5516         }
5517         spin_lock_irqsave(&info->lock,flags);
5518         info->tx_active = false;
5519         info->tx_count = info->tx_put = info->tx_get = 0;
5520
5521         spin_unlock_irqrestore(&info->lock,flags);
5522
5523 #if SYNCLINK_GENERIC_HDLC
5524         if (info->netcount)
5525                 hdlcdev_tx_done(info);
5526         else
5527 #endif
5528                 bh_transmit(info);
5529 }
5530
5531 /* called to periodically check the DSR/RI modem signal input status
5532  */
5533 static void status_timeout(unsigned long context)
5534 {
5535         u16 status = 0;
5536         SLMP_INFO *info = (SLMP_INFO*)context;
5537         unsigned long flags;
5538         unsigned char delta;
5539
5540
5541         spin_lock_irqsave(&info->lock,flags);
5542         get_signals(info);
5543         spin_unlock_irqrestore(&info->lock,flags);
5544
5545         /* check for DSR/RI state change */
5546
5547         delta = info->old_signals ^ info->serial_signals;
5548         info->old_signals = info->serial_signals;
5549
5550         if (delta & SerialSignal_DSR)
5551                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5552
5553         if (delta & SerialSignal_RI)
5554                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5555
5556         if (delta & SerialSignal_DCD)
5557                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5558
5559         if (delta & SerialSignal_CTS)
5560                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5561
5562         if (status)
5563                 isr_io_pin(info,status);
5564
5565         mod_timer(&info->status_timer, jiffies + msecs_to_jiffies(10));
5566 }
5567
5568
5569 /* Register Access Routines -
5570  * All registers are memory mapped
5571  */
5572 #define CALC_REGADDR() \
5573         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5574         if (info->port_num > 1) \
5575                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5576         if ( info->port_num & 1) { \
5577                 if (Addr > 0x7f) \
5578                         RegAddr += 0x40;        /* DMA access */ \
5579                 else if (Addr > 0x1f && Addr < 0x60) \
5580                         RegAddr += 0x20;        /* MSCI access */ \
5581         }
5582
5583
5584 static unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5585 {
5586         CALC_REGADDR();
5587         return *RegAddr;
5588 }
5589 static void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5590 {
5591         CALC_REGADDR();
5592         *RegAddr = Value;
5593 }
5594
5595 static u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5596 {
5597         CALC_REGADDR();
5598         return *((u16 *)RegAddr);
5599 }
5600
5601 static void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5602 {
5603         CALC_REGADDR();
5604         *((u16 *)RegAddr) = Value;
5605 }
5606
5607 static unsigned char read_status_reg(SLMP_INFO * info)
5608 {
5609         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5610         return *RegAddr;
5611 }
5612
5613 static void write_control_reg(SLMP_INFO * info)
5614 {
5615         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5616         *RegAddr = info->port_array[0]->ctrlreg_value;
5617 }
5618
5619
5620 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5621                                           const struct pci_device_id *ent)
5622 {
5623         if (pci_enable_device(dev)) {
5624                 printk("error enabling pci device %p\n", dev);
5625                 return -EIO;
5626         }
5627         device_init( ++synclinkmp_adapter_count, dev );
5628         return 0;
5629 }
5630
5631 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5632 {
5633 }