drivers/isdn/hisax/hisax_isac.c

   1 /*
   2  * Driver for ISAC-S and ISAC-SX
   3  * ISDN Subscriber Access Controller for Terminals
   4  *
   5  * Author       Kai Germaschewski
   6  * Copyright    2001 by Kai Germaschewski  <kai.germaschewski@gmx.de>
   7  *              2001 by Karsten Keil       <keil@isdn4linux.de>
   8  *
   9  * based upon Karsten Keil's original isac.c driver
  10  *
  11  * This software may be used and distributed according to the terms
  12  * of the GNU General Public License, incorporated herein by reference.
  13  *
  14  * Thanks to Wizard Computersysteme GmbH, Bremervoerde and
  15  *           SoHaNet Technology GmbH, Berlin
  16  * for supporting the development of this driver
  17  */
  18
  19 /* TODO:
  20  * specifically handle level vs edge triggered?
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/netdevice.h>
  26 #include "hisax_isac.h"
  27
  28 // debugging cruft
  29
  30 #define __debug_variable debug
  31 #include "hisax_debug.h"
  32
  33 #ifdef CONFIG_HISAX_DEBUG
  34 static int debug = 1;
  35 module_param(debug, int, 0);
  36
  37 static char *ISACVer[] = {
  38   "2086/2186 V1.1",
  39   "2085 B1",
  40   "2085 B2",
  41   "2085 V2.3"
  42 };
  43 #endif
  44
  45 MODULE_AUTHOR("Kai Germaschewski <kai.germaschewski@gmx.de>/Karsten Keil <kkeil@suse.de>");
  46 MODULE_DESCRIPTION("ISAC/ISAC-SX driver");
  47 MODULE_LICENSE("GPL");
  48
  49 #define DBG_WARN      0x0001
  50 #define DBG_IRQ       0x0002
  51 #define DBG_L1M       0x0004
  52 #define DBG_PR        0x0008
  53 #define DBG_RFIFO     0x0100
  54 #define DBG_RPACKET   0x0200
  55 #define DBG_XFIFO     0x1000
  56 #define DBG_XPACKET   0x2000
  57
  58 // we need to distinguish ISAC-S and ISAC-SX
  59 #define TYPE_ISAC        0x00
  60 #define TYPE_ISACSX      0x01
  61
  62 // registers etc.
  63 #define ISAC_MASK        0x20
  64 #define ISAC_ISTA        0x20
  65 #define ISAC_ISTA_EXI    0x01
  66 #define ISAC_ISTA_SIN    0x02
  67 #define ISAC_ISTA_CISQ   0x04
  68 #define ISAC_ISTA_XPR    0x10
  69 #define ISAC_ISTA_RSC    0x20
  70 #define ISAC_ISTA_RPF    0x40
  71 #define ISAC_ISTA_RME    0x80
  72
  73 #define ISAC_STAR        0x21
  74 #define ISAC_CMDR        0x21
  75 #define ISAC_CMDR_XRES   0x01
  76 #define ISAC_CMDR_XME    0x02
  77 #define ISAC_CMDR_XTF    0x08
  78 #define ISAC_CMDR_RRES   0x40
  79 #define ISAC_CMDR_RMC    0x80
  80
  81 #define ISAC_EXIR        0x24
  82 #define ISAC_EXIR_MOS    0x04
  83 #define ISAC_EXIR_XDU    0x40
  84 #define ISAC_EXIR_XMR    0x80
  85
  86 #define ISAC_ADF2        0x39
  87 #define ISAC_SPCR        0x30
  88 #define ISAC_ADF1        0x38
  89
  90 #define ISAC_CIR0        0x31
  91 #define ISAC_CIX0        0x31
  92 #define ISAC_CIR0_CIC0   0x02
  93 #define ISAC_CIR0_CIC1   0x01
  94
  95 #define ISAC_CIR1        0x33
  96 #define ISAC_CIX1        0x33
  97 #define ISAC_STCR        0x37
  98 #define ISAC_MODE        0x22
  99
 100 #define ISAC_RSTA        0x27
 101 #define ISAC_RSTA_RDO    0x40
 102 #define ISAC_RSTA_CRC    0x20
 103 #define ISAC_RSTA_RAB    0x10
 104
 105 #define ISAC_RBCL 0x25
 106 #define ISAC_RBCH 0x2A
 107 #define ISAC_TIMR 0x23
 108 #define ISAC_SQXR 0x3b
 109 #define ISAC_MOSR 0x3a
 110 #define ISAC_MOCR 0x3a
 111 #define ISAC_MOR0 0x32
 112 #define ISAC_MOX0 0x32
 113 #define ISAC_MOR1 0x34
 114 #define ISAC_MOX1 0x34
 115
 116 #define ISAC_RBCH_XAC 0x80
 117
 118 #define ISAC_CMD_TIM    0x0
 119 #define ISAC_CMD_RES    0x1
 120 #define ISAC_CMD_SSP    0x2
 121 #define ISAC_CMD_SCP    0x3
 122 #define ISAC_CMD_AR8    0x8
 123 #define ISAC_CMD_AR10   0x9
 124 #define ISAC_CMD_ARL    0xa
 125 #define ISAC_CMD_DI     0xf
 126
 127 #define ISACSX_MASK       0x60
 128 #define ISACSX_ISTA       0x60
 129 #define ISACSX_ISTA_ICD   0x01
 130 #define ISACSX_ISTA_CIC   0x10
 131
 132 #define ISACSX_MASKD      0x20
 133 #define ISACSX_ISTAD      0x20
 134 #define ISACSX_ISTAD_XDU  0x04
 135 #define ISACSX_ISTAD_XMR  0x08
 136 #define ISACSX_ISTAD_XPR  0x10
 137 #define ISACSX_ISTAD_RFO  0x20
 138 #define ISACSX_ISTAD_RPF  0x40
 139 #define ISACSX_ISTAD_RME  0x80
 140
 141 #define ISACSX_CMDRD      0x21
 142 #define ISACSX_CMDRD_XRES 0x01
 143 #define ISACSX_CMDRD_XME  0x02
 144 #define ISACSX_CMDRD_XTF  0x08
 145 #define ISACSX_CMDRD_RRES 0x40
 146 #define ISACSX_CMDRD_RMC  0x80
 147
 148 #define ISACSX_MODED      0x22
 149
 150 #define ISACSX_RBCLD      0x26
 151
 152 #define ISACSX_RSTAD      0x28
 153 #define ISACSX_RSTAD_RAB  0x10
 154 #define ISACSX_RSTAD_CRC  0x20
 155 #define ISACSX_RSTAD_RDO  0x40
 156 #define ISACSX_RSTAD_VFR  0x80
 157
 158 #define ISACSX_CIR0       0x2e
 159 #define ISACSX_CIR0_CIC0  0x08
 160 #define ISACSX_CIX0       0x2e
 161
 162 #define ISACSX_TR_CONF0   0x30
 163
 164 #define ISACSX_TR_CONF2   0x32
 165
 166 static struct Fsm l1fsm;
 167
 168 enum {
 169         ST_L1_RESET,
 170         ST_L1_F3_PDOWN,
 171         ST_L1_F3_PUP,
 172         ST_L1_F3_PEND_DEACT,
 173         ST_L1_F4,
 174         ST_L1_F5,
 175         ST_L1_F6,
 176         ST_L1_F7,
 177         ST_L1_F8,
 178 };
 179
 180 #define L1_STATE_COUNT (ST_L1_F8+1)
 181
 182 static char *strL1State[] =
 183 {
 184         "ST_L1_RESET",
 185         "ST_L1_F3_PDOWN",
 186         "ST_L1_F3_PUP",
 187         "ST_L1_F3_PEND_DEACT",
 188         "ST_L1_F4",
 189         "ST_L1_F5",
 190         "ST_L1_F6",
 191         "ST_L1_F7",
 192         "ST_L1_F8",
 193 };
 194
 195 enum {
 196         EV_PH_DR,           // 0000
 197         EV_PH_RES,          // 0001
 198         EV_PH_TMA,          // 0010
 199         EV_PH_SLD,          // 0011
 200         EV_PH_RSY,          // 0100
 201         EV_PH_DR6,          // 0101
 202         EV_PH_EI,           // 0110
 203         EV_PH_PU,           // 0111
 204         EV_PH_AR,           // 1000
 205         EV_PH_9,            // 1001
 206         EV_PH_ARL,          // 1010
 207         EV_PH_CVR,          // 1011
 208         EV_PH_AI8,          // 1100
 209         EV_PH_AI10,         // 1101
 210         EV_PH_AIL,          // 1110
 211         EV_PH_DC,           // 1111
 212         EV_PH_ACTIVATE_REQ,
 213         EV_PH_DEACTIVATE_REQ,
 214         EV_TIMER3,
 215 };
 216
 217 #define L1_EVENT_COUNT (EV_TIMER3 + 1)
 218
 219 static char *strL1Event[] =
 220 {
 221         "EV_PH_DR",           // 0000
 222         "EV_PH_RES",          // 0001
 223         "EV_PH_TMA",          // 0010
 224         "EV_PH_SLD",          // 0011
 225         "EV_PH_RSY",          // 0100
 226         "EV_PH_DR6",          // 0101
 227         "EV_PH_EI",           // 0110
 228         "EV_PH_PU",           // 0111
 229         "EV_PH_AR",           // 1000
 230         "EV_PH_9",            // 1001
 231         "EV_PH_ARL",          // 1010
 232         "EV_PH_CVR",          // 1011
 233         "EV_PH_AI8",          // 1100
 234         "EV_PH_AI10",         // 1101
 235         "EV_PH_AIL",          // 1110
 236         "EV_PH_DC",           // 1111
 237         "EV_PH_ACTIVATE_REQ",
 238         "EV_PH_DEACTIVATE_REQ",
 239         "EV_TIMER3",
 240 };
 241
 242 static inline void D_L1L2(struct isac *isac, int pr, void *arg)
 243 {
 244         struct hisax_if *ifc = (struct hisax_if *) &isac->hisax_d_if;
 245
 246         DBG(DBG_PR, "pr %#x", pr);
 247         ifc->l1l2(ifc, pr, arg);
 248 }
 249
 250 static void ph_command(struct isac *isac, unsigned int command)
 251 {
 252         DBG(DBG_L1M, "ph_command %#x", command);
 253         switch (isac->type) {
 254         case TYPE_ISAC:
 255                 isac->write_isac(isac, ISAC_CIX0, (command << 2) | 3);
 256                 break;
 257         case TYPE_ISACSX:
 258                 isac->write_isac(isac, ISACSX_CIX0, (command << 4) | (7 << 1));
 259                 break;
 260         }
 261 }
 262
 263 // ----------------------------------------------------------------------
 264
 265 static void l1_di(struct FsmInst *fi, int event, void *arg)
 266 {
 267         struct isac *isac = fi->userdata;
 268
 269         FsmChangeState(fi, ST_L1_RESET);
 270         ph_command(isac, ISAC_CMD_DI);
 271 }
 272
 273 static void l1_di_deact_ind(struct FsmInst *fi, int event, void *arg)
 274 {
 275         struct isac *isac = fi->userdata;
 276
 277         FsmChangeState(fi, ST_L1_RESET);
 278         D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
 279         ph_command(isac, ISAC_CMD_DI);
 280 }
 281
 282 static void l1_go_f3pdown(struct FsmInst *fi, int event, void *arg)
 283 {
 284         FsmChangeState(fi, ST_L1_F3_PDOWN);
 285 }
 286
 287 static void l1_go_f3pend_deact_ind(struct FsmInst *fi, int event, void *arg)
 288 {
 289         struct isac *isac = fi->userdata;
 290
 291         FsmChangeState(fi, ST_L1_F3_PEND_DEACT);
 292         D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
 293         ph_command(isac, ISAC_CMD_DI);
 294 }
 295
 296 static void l1_go_f3pend(struct FsmInst *fi, int event, void *arg)
 297 {
 298         struct isac *isac = fi->userdata;
 299
 300         FsmChangeState(fi, ST_L1_F3_PEND_DEACT);
 301         ph_command(isac, ISAC_CMD_DI);
 302 }
 303
 304 static void l1_go_f4(struct FsmInst *fi, int event, void *arg)
 305 {
 306         FsmChangeState(fi, ST_L1_F4);
 307 }
 308
 309 static void l1_go_f5(struct FsmInst *fi, int event, void *arg)
 310 {
 311         FsmChangeState(fi, ST_L1_F5);
 312 }
 313
 314 static void l1_go_f6(struct FsmInst *fi, int event, void *arg)
 315 {
 316         FsmChangeState(fi, ST_L1_F6);
 317 }
 318
 319 static void l1_go_f6_deact_ind(struct FsmInst *fi, int event, void *arg)
 320 {
 321         struct isac *isac = fi->userdata;
 322
 323         FsmChangeState(fi, ST_L1_F6);
 324         D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
 325 }
 326
 327 static void l1_go_f7_act_ind(struct FsmInst *fi, int event, void *arg)
 328 {
 329         struct isac *isac = fi->userdata;
 330
 331         FsmDelTimer(&isac->timer, 0);
 332         FsmChangeState(fi, ST_L1_F7);
 333         ph_command(isac, ISAC_CMD_AR8);
 334         D_L1L2(isac, PH_ACTIVATE | INDICATION, NULL);
 335 }
 336
 337 static void l1_go_f8(struct FsmInst *fi, int event, void *arg)
 338 {
 339         FsmChangeState(fi, ST_L1_F8);
 340 }
 341
 342 static void l1_go_f8_deact_ind(struct FsmInst *fi, int event, void *arg)
 343 {
 344         struct isac *isac = fi->userdata;
 345
 346         FsmChangeState(fi, ST_L1_F8);
 347         D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
 348 }
 349
 350 static void l1_ar8(struct FsmInst *fi, int event, void *arg)
 351 {
 352         struct isac *isac = fi->userdata;
 353
 354         FsmRestartTimer(&isac->timer, TIMER3_VALUE, EV_TIMER3, NULL, 2);
 355         ph_command(isac, ISAC_CMD_AR8);
 356 }
 357
 358 static void l1_timer3(struct FsmInst *fi, int event, void *arg)
 359 {
 360         struct isac *isac = fi->userdata;
 361
 362         ph_command(isac, ISAC_CMD_DI);
 363         D_L1L2(isac, PH_DEACTIVATE | INDICATION, NULL);
 364 }
 365
 366 // state machines according to data sheet PSB 2186 / 3186
 367
 368 static struct FsmNode L1FnList[] __initdata =
 369 {
 370         {ST_L1_RESET,         EV_PH_RES,            l1_di},
 371         {ST_L1_RESET,         EV_PH_EI,             l1_di},
 372         {ST_L1_RESET,         EV_PH_DC,             l1_go_f3pdown},
 373         {ST_L1_RESET,         EV_PH_AR,             l1_go_f6},
 374         {ST_L1_RESET,         EV_PH_AI8,            l1_go_f7_act_ind},
 375
 376         {ST_L1_F3_PDOWN,      EV_PH_RES,            l1_di},
 377         {ST_L1_F3_PDOWN,      EV_PH_EI,             l1_di},
 378         {ST_L1_F3_PDOWN,      EV_PH_AR,             l1_go_f6},
 379         {ST_L1_F3_PDOWN,      EV_PH_RSY,            l1_go_f5},
 380         {ST_L1_F3_PDOWN,      EV_PH_PU,             l1_go_f4},
 381         {ST_L1_F3_PDOWN,      EV_PH_AI8,            l1_go_f7_act_ind},
 382         {ST_L1_F3_PDOWN,      EV_PH_ACTIVATE_REQ,   l1_ar8},
 383         {ST_L1_F3_PDOWN,      EV_TIMER3,            l1_timer3},
 384
 385         {ST_L1_F3_PEND_DEACT, EV_PH_RES,            l1_di},
 386         {ST_L1_F3_PEND_DEACT, EV_PH_EI,             l1_di},
 387         {ST_L1_F3_PEND_DEACT, EV_PH_DC,             l1_go_f3pdown},
 388         {ST_L1_F3_PEND_DEACT, EV_PH_RSY,            l1_go_f5},
 389         {ST_L1_F3_PEND_DEACT, EV_PH_AR,             l1_go_f6},
 390         {ST_L1_F3_PEND_DEACT, EV_PH_AI8,            l1_go_f7_act_ind},
 391
 392         {ST_L1_F4,            EV_PH_RES,            l1_di},
 393         {ST_L1_F4,            EV_PH_EI,             l1_di},
 394         {ST_L1_F4,            EV_PH_RSY,            l1_go_f5},
 395         {ST_L1_F4,            EV_PH_AI8,            l1_go_f7_act_ind},
 396         {ST_L1_F4,            EV_TIMER3,            l1_timer3},
 397         {ST_L1_F4,            EV_PH_DC,             l1_go_f3pdown},
 398
 399         {ST_L1_F5,            EV_PH_RES,            l1_di},
 400         {ST_L1_F5,            EV_PH_EI,             l1_di},
 401         {ST_L1_F5,            EV_PH_AR,             l1_go_f6},
 402         {ST_L1_F5,            EV_PH_AI8,            l1_go_f7_act_ind},
 403         {ST_L1_F5,            EV_TIMER3,            l1_timer3},
 404         {ST_L1_F5,            EV_PH_DR,             l1_go_f3pend},
 405         {ST_L1_F5,            EV_PH_DC,             l1_go_f3pdown},
 406
 407         {ST_L1_F6,            EV_PH_RES,            l1_di},
 408         {ST_L1_F6,            EV_PH_EI,             l1_di},
 409         {ST_L1_F6,            EV_PH_RSY,            l1_go_f8},
 410         {ST_L1_F6,            EV_PH_AI8,            l1_go_f7_act_ind},
 411         {ST_L1_F6,            EV_PH_DR6,            l1_go_f3pend},
 412         {ST_L1_F6,            EV_TIMER3,            l1_timer3},
 413         {ST_L1_F6,            EV_PH_DC,             l1_go_f3pdown},
 414
 415         {ST_L1_F7,            EV_PH_RES,            l1_di_deact_ind},
 416         {ST_L1_F7,            EV_PH_EI,             l1_di_deact_ind},
 417         {ST_L1_F7,            EV_PH_AR,             l1_go_f6_deact_ind},
 418         {ST_L1_F7,            EV_PH_RSY,            l1_go_f8_deact_ind},
 419         {ST_L1_F7,            EV_PH_DR,             l1_go_f3pend_deact_ind},
 420
 421         {ST_L1_F8,            EV_PH_RES,            l1_di},
 422         {ST_L1_F8,            EV_PH_EI,             l1_di},
 423         {ST_L1_F8,            EV_PH_AR,             l1_go_f6},
 424         {ST_L1_F8,            EV_PH_DR,             l1_go_f3pend},
 425         {ST_L1_F8,            EV_PH_AI8,            l1_go_f7_act_ind},
 426         {ST_L1_F8,            EV_TIMER3,            l1_timer3},
 427         {ST_L1_F8,            EV_PH_DC,             l1_go_f3pdown},
 428 };
 429
 430 static void l1m_debug(struct FsmInst *fi, char *fmt, ...)
 431 {
 432         va_list args;
 433         char buf[256];
 434
 435         va_start(args, fmt);
 436         vsprintf(buf, fmt, args);
 437         DBG(DBG_L1M, "%s", buf);
 438         va_end(args);
 439 }
 440
 441 static void isac_version(struct isac *cs)
 442 {
 443         int val;
 444
 445         val = cs->read_isac(cs, ISAC_RBCH);
 446         DBG(1, "ISAC version (%x): %s", val, ISACVer[(val >> 5) & 3]);
 447 }
 448
 449 static void isac_empty_fifo(struct isac *isac, int count)
 450 {
 451         // this also works for isacsx, since
 452         // CMDR(D) register works the same
 453         u_char *ptr;
 454
 455         DBG(DBG_IRQ, "count %d", count);
 456
 457         if ((isac->rcvidx + count) >= MAX_DFRAME_LEN_L1) {
 458                 DBG(DBG_WARN, "overrun %d", isac->rcvidx + count);
 459                 isac->write_isac(isac, ISAC_CMDR, ISAC_CMDR_RMC);
 460                 isac->rcvidx = 0;
 461                 return;
 462         }
 463         ptr = isac->rcvbuf + isac->rcvidx;
 464         isac->rcvidx += count;
 465         isac->read_isac_fifo(isac, ptr, count);
 466         isac->write_isac(isac, ISAC_CMDR, ISAC_CMDR_RMC);
 467         DBG_PACKET(DBG_RFIFO, ptr, count);
 468 }
 469
 470 static void isac_fill_fifo(struct isac *isac)
 471 {
 472         // this also works for isacsx, since
 473         // CMDR(D) register works the same
 474
 475         int count;
 476         unsigned char cmd;
 477         u_char *ptr;
 478
 479         BUG_ON(!isac->tx_skb);
 480
 481         count = isac->tx_skb->len;
 482         BUG_ON(count <= 0);
 483
 484         DBG(DBG_IRQ, "count %d", count);
 485
 486         if (count > 0x20) {
 487                 count = 0x20;
 488                 cmd = ISAC_CMDR_XTF;
 489         } else {
 490                 cmd = ISAC_CMDR_XTF | ISAC_CMDR_XME;
 491         }
 492
 493         ptr = isac->tx_skb->data;
 494         skb_pull(isac->tx_skb, count);
 495         isac->tx_cnt += count;
 496         DBG_PACKET(DBG_XFIFO, ptr, count);
 497         isac->write_isac_fifo(isac, ptr, count);
 498         isac->write_isac(isac, ISAC_CMDR, cmd);
 499 }
 500
 501 static void isac_retransmit(struct isac *isac)
 502 {
 503         if (!isac->tx_skb) {
 504                 DBG(DBG_WARN, "no skb");
 505                 return;
 506         }
 507         skb_push(isac->tx_skb, isac->tx_cnt);
 508         isac->tx_cnt = 0;
 509 }
 510
 511
 512 static inline void isac_cisq_interrupt(struct isac *isac)
 513 {
 514         unsigned char val;
 515
 516         val = isac->read_isac(isac, ISAC_CIR0);
 517         DBG(DBG_IRQ, "CIR0 %#x", val);
 518         if (val & ISAC_CIR0_CIC0) {
 519                 DBG(DBG_IRQ, "CODR0 %#x", (val >> 2) & 0xf);
 520                 FsmEvent(&isac->l1m, (val >> 2) & 0xf, NULL);
 521         }
 522         if (val & ISAC_CIR0_CIC1) {
 523                 val = isac->read_isac(isac, ISAC_CIR1);
 524                 DBG(DBG_WARN, "ISAC CIR1 %#x", val );
 525         }
 526 }
 527
 528 static inline void isac_rme_interrupt(struct isac *isac)
 529 {
 530         unsigned char val;
 531         int count;
 532         struct sk_buff *skb;
 533
 534         val = isac->read_isac(isac, ISAC_RSTA);
 535         if ((val & (ISAC_RSTA_RDO | ISAC_RSTA_CRC | ISAC_RSTA_RAB) )
 536              != ISAC_RSTA_CRC) {
 537                 DBG(DBG_WARN, "RSTA %#x, dropped", val);
 538                 isac->write_isac(isac, ISAC_CMDR, ISAC_CMDR_RMC);
 539                 goto out;
 540         }
 541
 542         count = isac->read_isac(isac, ISAC_RBCL) & 0x1f;
 543         DBG(DBG_IRQ, "RBCL %#x", count);
 544         if (count == 0)
 545                 count = 0x20;
 546
 547         isac_empty_fifo(isac, count);
 548         count = isac->rcvidx;
 549         if (count < 1) {
 550                 DBG(DBG_WARN, "count %d < 1", count);
 551                 goto out;
 552         }
 553
 554         skb = alloc_skb(count, GFP_ATOMIC);
 555         if (!skb) {
 556                 DBG(DBG_WARN, "no memory, dropping\n");
 557                 goto out;
 558         }
 559         memcpy(skb_put(skb, count), isac->rcvbuf, count);
 560         DBG_SKB(DBG_RPACKET, skb);
 561         D_L1L2(isac, PH_DATA | INDICATION, skb);
 562  out:
 563         isac->rcvidx = 0;
 564 }
 565
 566 static inline void isac_xpr_interrupt(struct isac *isac)
 567 {
 568         if (!isac->tx_skb)
 569                 return;
 570
 571         if (isac->tx_skb->len > 0) {
 572                 isac_fill_fifo(isac);
 573                 return;
 574         }
 575         dev_kfree_skb_irq(isac->tx_skb);
 576         isac->tx_cnt = 0;
 577         isac->tx_skb = NULL;
 578         D_L1L2(isac, PH_DATA | CONFIRM, NULL);
 579 }
 580
 581 static inline void isac_exi_interrupt(struct isac *isac)
 582 {
 583         unsigned char val;
 584
 585         val = isac->read_isac(isac, ISAC_EXIR);
 586         DBG(2, "EXIR %#x", val);
 587
 588         if (val & ISAC_EXIR_XMR) {
 589                 DBG(DBG_WARN, "ISAC XMR");
 590                 isac_retransmit(isac);
 591         }
 592         if (val & ISAC_EXIR_XDU) {
 593                 DBG(DBG_WARN, "ISAC XDU");
 594                 isac_retransmit(isac);
 595         }
 596         if (val & ISAC_EXIR_MOS) {  /* MOS */
 597                 DBG(DBG_WARN, "MOS");
 598                 val = isac->read_isac(isac, ISAC_MOSR);
 599                 DBG(2, "ISAC MOSR %#x", val);
 600         }
 601 }
 602
 603 void isac_irq(struct isac *isac)
 604 {
 605         unsigned char val;
 606
 607         val = isac->read_isac(isac, ISAC_ISTA);
 608         DBG(DBG_IRQ, "ISTA %#x", val);
 609
 610         if (val & ISAC_ISTA_EXI) {
 611                 DBG(DBG_IRQ, "EXI");
 612                 isac_exi_interrupt(isac);
 613         }
 614         if (val & ISAC_ISTA_XPR) {
 615                 DBG(DBG_IRQ, "XPR");
 616                 isac_xpr_interrupt(isac);
 617         }
 618         if (val & ISAC_ISTA_RME) {
 619                 DBG(DBG_IRQ, "RME");
 620                 isac_rme_interrupt(isac);
 621         }
 622         if (val & ISAC_ISTA_RPF) {
 623                 DBG(DBG_IRQ, "RPF");
 624                 isac_empty_fifo(isac, 0x20);
 625         }
 626         if (val & ISAC_ISTA_CISQ) {
 627                 DBG(DBG_IRQ, "CISQ");
 628                 isac_cisq_interrupt(isac);
 629         }
 630         if (val & ISAC_ISTA_RSC) {
 631                 DBG(DBG_WARN, "RSC");
 632         }
 633         if (val & ISAC_ISTA_SIN) {
 634                 DBG(DBG_WARN, "SIN");
 635         }
 636         isac->write_isac(isac, ISAC_MASK, 0xff);
 637         isac->write_isac(isac, ISAC_MASK, 0x00);
 638 }
 639
 640 // ======================================================================
 641
 642 static inline void isacsx_cic_interrupt(struct isac *isac)
 643 {
 644         unsigned char val;
 645
 646         val = isac->read_isac(isac, ISACSX_CIR0);
 647         DBG(DBG_IRQ, "CIR0 %#x", val);
 648         if (val & ISACSX_CIR0_CIC0) {
 649                 DBG(DBG_IRQ, "CODR0 %#x", val >> 4);
 650                 FsmEvent(&isac->l1m, val >> 4, NULL);
 651         }
 652 }
 653
 654 static inline void isacsx_rme_interrupt(struct isac *isac)
 655 {
 656         int count;
 657         struct sk_buff *skb;
 658         unsigned char val;
 659
 660         val = isac->read_isac(isac, ISACSX_RSTAD);
 661         if ((val & (ISACSX_RSTAD_VFR |
 662                     ISACSX_RSTAD_RDO |
 663                     ISACSX_RSTAD_CRC |
 664                     ISACSX_RSTAD_RAB))
 665             != (ISACSX_RSTAD_VFR | ISACSX_RSTAD_CRC)) {
 666                 DBG(DBG_WARN, "RSTAD %#x, dropped", val);
 667                 isac->write_isac(isac, ISACSX_CMDRD, ISACSX_CMDRD_RMC);
 668                 goto out;
 669         }
 670
 671         count = isac->read_isac(isac, ISACSX_RBCLD) & 0x1f;
 672         DBG(DBG_IRQ, "RBCLD %#x", count);
 673         if (count == 0)
 674                 count = 0x20;
 675
 676         isac_empty_fifo(isac, count);
 677         // strip trailing status byte
 678         count = isac->rcvidx - 1;
 679         if (count < 1) {
 680                 DBG(DBG_WARN, "count %d < 1", count);
 681                 goto out;
 682         }
 683
 684         skb = dev_alloc_skb(count);
 685         if (!skb) {
 686                 DBG(DBG_WARN, "no memory, dropping");
 687                 goto out;
 688         }
 689         memcpy(skb_put(skb, count), isac->rcvbuf, count);
 690         DBG_SKB(DBG_RPACKET, skb);
 691         D_L1L2(isac, PH_DATA | INDICATION, skb);
 692  out:
 693         isac->rcvidx = 0;
 694 }
 695
 696 static inline void isacsx_xpr_interrupt(struct isac *isac)
 697 {
 698         if (!isac->tx_skb)
 699                 return;
 700
 701         if (isac->tx_skb->len > 0) {
 702                 isac_fill_fifo(isac);
 703                 return;
 704         }
 705         dev_kfree_skb_irq(isac->tx_skb);
 706         isac->tx_skb = NULL;
 707         isac->tx_cnt = 0;
 708         D_L1L2(isac, PH_DATA | CONFIRM, NULL);
 709 }
 710
 711 static inline void isacsx_icd_interrupt(struct isac *isac)
 712 {
 713         unsigned char val;
 714
 715         val = isac->read_isac(isac, ISACSX_ISTAD);
 716         DBG(DBG_IRQ, "ISTAD %#x", val);
 717         if (val & ISACSX_ISTAD_XDU) {
 718                 DBG(DBG_WARN, "ISTAD XDU");
 719                 isac_retransmit(isac);
 720         }
 721         if (val & ISACSX_ISTAD_XMR) {
 722                 DBG(DBG_WARN, "ISTAD XMR");
 723                 isac_retransmit(isac);
 724         }
 725         if (val & ISACSX_ISTAD_XPR) {
 726                 DBG(DBG_IRQ, "ISTAD XPR");
 727                 isacsx_xpr_interrupt(isac);
 728         }
 729         if (val & ISACSX_ISTAD_RFO) {
 730                 DBG(DBG_WARN, "ISTAD RFO");
 731                 isac->write_isac(isac, ISACSX_CMDRD, ISACSX_CMDRD_RMC);
 732         }
 733         if (val & ISACSX_ISTAD_RME) {
 734                 DBG(DBG_IRQ, "ISTAD RME");
 735                 isacsx_rme_interrupt(isac);
 736         }
 737         if (val & ISACSX_ISTAD_RPF) {
 738                 DBG(DBG_IRQ, "ISTAD RPF");
 739                 isac_empty_fifo(isac, 0x20);
 740         }
 741 }
 742
 743 void isacsx_irq(struct isac *isac)
 744 {
 745         unsigned char val;
 746
 747         val = isac->read_isac(isac, ISACSX_ISTA);
 748         DBG(DBG_IRQ, "ISTA %#x", val);
 749
 750         if (val & ISACSX_ISTA_ICD)
 751                 isacsx_icd_interrupt(isac);
 752         if (val & ISACSX_ISTA_CIC)
 753                 isacsx_cic_interrupt(isac);
 754 }
 755
 756 void isac_init(struct isac *isac)
 757 {
 758         isac->tx_skb = NULL;
 759         isac->l1m.fsm = &l1fsm;
 760         isac->l1m.state = ST_L1_RESET;
 761 #ifdef CONFIG_HISAX_DEBUG
 762         isac->l1m.debug = 1;
 763 #else
 764         isac->l1m.debug = 0;
 765 #endif
 766         isac->l1m.userdata = isac;
 767         isac->l1m.printdebug = l1m_debug;
 768         FsmInitTimer(&isac->l1m, &isac->timer);
 769 }
 770
 771 void isac_setup(struct isac *isac)
 772 {
 773         int val, eval;
 774
 775         isac->type = TYPE_ISAC;
 776         isac_version(isac);
 777
 778         ph_command(isac, ISAC_CMD_RES);
 779
 780         isac->write_isac(isac, ISAC_MASK, 0xff);
 781         isac->mocr = 0xaa;
 782         if (test_bit(ISAC_IOM1, &isac->flags)) {
 783                 /* IOM 1 Mode */
 784                 isac->write_isac(isac, ISAC_ADF2, 0x0);
 785                 isac->write_isac(isac, ISAC_SPCR, 0xa);
 786                 isac->write_isac(isac, ISAC_ADF1, 0x2);
 787                 isac->write_isac(isac, ISAC_STCR, 0x70);
 788                 isac->write_isac(isac, ISAC_MODE, 0xc9);
 789         } else {
 790                 /* IOM 2 Mode */
 791                 if (!isac->adf2)
 792                         isac->adf2 = 0x80;
 793                 isac->write_isac(isac, ISAC_ADF2, isac->adf2);
 794                 isac->write_isac(isac, ISAC_SQXR, 0x2f);
 795                 isac->write_isac(isac, ISAC_SPCR, 0x00);
 796                 isac->write_isac(isac, ISAC_STCR, 0x70);
 797                 isac->write_isac(isac, ISAC_MODE, 0xc9);
 798                 isac->write_isac(isac, ISAC_TIMR, 0x00);
 799                 isac->write_isac(isac, ISAC_ADF1, 0x00);
 800         }
 801         val = isac->read_isac(isac, ISAC_STAR);
 802         DBG(2, "ISAC STAR %x", val);
 803         val = isac->read_isac(isac, ISAC_MODE);
 804         DBG(2, "ISAC MODE %x", val);
 805         val = isac->read_isac(isac, ISAC_ADF2);
 806         DBG(2, "ISAC ADF2 %x", val);
 807         val = isac->read_isac(isac, ISAC_ISTA);
 808         DBG(2, "ISAC ISTA %x", val);
 809         if (val & 0x01) {
 810                 eval = isac->read_isac(isac, ISAC_EXIR);
 811                 DBG(2, "ISAC EXIR %x", eval);
 812         }
 813         val = isac->read_isac(isac, ISAC_CIR0);
 814         DBG(2, "ISAC CIR0 %x", val);
 815         FsmEvent(&isac->l1m, (val >> 2) & 0xf, NULL);
 816
 817         isac->write_isac(isac, ISAC_MASK, 0x0);
 818         // RESET Receiver and Transmitter
 819         isac->write_isac(isac, ISAC_CMDR, ISAC_CMDR_XRES | ISAC_CMDR_RRES);
 820 }
 821
 822 void isacsx_setup(struct isac *isac)
 823 {
 824         isac->type = TYPE_ISACSX;
 825         // clear LDD
 826         isac->write_isac(isac, ISACSX_TR_CONF0, 0x00);
 827         // enable transmitter
 828         isac->write_isac(isac, ISACSX_TR_CONF2, 0x00);
 829         // transparent mode 0, RAC, stop/go
 830         isac->write_isac(isac, ISACSX_MODED,    0xc9);
 831         // all HDLC IRQ unmasked
 832         isac->write_isac(isac, ISACSX_MASKD,    0x03);
 833         // unmask ICD, CID IRQs
 834         isac->write_isac(isac, ISACSX_MASK,
 835                          ~(ISACSX_ISTA_ICD | ISACSX_ISTA_CIC));
 836 }
 837
 838 void isac_d_l2l1(struct hisax_if *hisax_d_if, int pr, void *arg)
 839 {
 840         struct isac *isac = hisax_d_if->priv;
 841         struct sk_buff *skb = arg;
 842
 843         DBG(DBG_PR, "pr %#x", pr);
 844
 845         switch (pr) {
 846         case PH_ACTIVATE | REQUEST:
 847                 FsmEvent(&isac->l1m, EV_PH_ACTIVATE_REQ, NULL);
 848                 break;
 849         case PH_DEACTIVATE | REQUEST:
 850                 FsmEvent(&isac->l1m, EV_PH_DEACTIVATE_REQ, NULL);
 851                 break;
 852         case PH_DATA | REQUEST:
 853                 DBG(DBG_PR, "PH_DATA REQUEST len %d", skb->len);
 854                 DBG_SKB(DBG_XPACKET, skb);
 855                 if (isac->l1m.state != ST_L1_F7) {
 856                         DBG(1, "L1 wrong state %d\n", isac->l1m.state);
 857                         dev_kfree_skb(skb);
 858                         break;
 859                 }
 860                 BUG_ON(isac->tx_skb);
 861
 862                 isac->tx_skb = skb;
 863                 isac_fill_fifo(isac);
 864                 break;
 865         }
 866 }
 867
 868 static int __init hisax_isac_init(void)
 869 {
 870         printk(KERN_INFO "hisax_isac: ISAC-S/ISAC-SX ISDN driver v0.1.0\n");
 871
 872         l1fsm.state_count = L1_STATE_COUNT;
 873         l1fsm.event_count = L1_EVENT_COUNT;
 874         l1fsm.strState = strL1State;
 875         l1fsm.strEvent = strL1Event;
 876         return FsmNew(&l1fsm, L1FnList, ARRAY_SIZE(L1FnList));
 877 }
 878
 879 static void __exit hisax_isac_exit(void)
 880 {
 881         FsmFree(&l1fsm);
 882 }
 883
 884 EXPORT_SYMBOL(isac_init);
 885 EXPORT_SYMBOL(isac_d_l2l1);
 886
 887 EXPORT_SYMBOL(isacsx_setup);
 888 EXPORT_SYMBOL(isacsx_irq);
 889
 890 EXPORT_SYMBOL(isac_setup);
 891 EXPORT_SYMBOL(isac_irq);
 892
 893 module_init(hisax_isac_init);
 894 module_exit(hisax_isac_exit);