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   1 /*
   2  *  linux/arch/arm26/kernel/ecard.c
   3  *
   4  *  Copyright 1995-2001 Russell King
   5  *  Copyright 2003 Ian Molton
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  *  Find all installed expansion cards, and handle interrupts from them.
  12  *
  13  *  Created from information from Acorns RiscOS3 PRMs
  14  *  15-Jun-2003 IM      Modified from ARM32 (RiscPC capable) version
  15  *  10-Jan-1999 RMK     Run loaders in a simulated RISC OS environment.
  16  *  06-May-1997 RMK     Added blacklist for cards whose loader doesn't work.
  17  *  12-Sep-1997 RMK     Created new handling of interrupt enables/disables
  18  *                      - cards can now register their own routine to control
  19  *                      interrupts (recommended).
  20  *  29-Sep-1997 RMK     Expansion card interrupt hardware not being re-enabled
  21  *                      on reset from Linux. (Caused cards not to respond
  22  *                      under RiscOS without hard reset).
  23  *
  24  */
  25 #define ECARD_C
  26
  27 #include <linux/config.h>
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/types.h>
  31 #include <linux/sched.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/reboot.h>
  34 #include <linux/mm.h>
  35 #include <linux/slab.h>
  36 #include <linux/proc_fs.h>
  37 #include <linux/device.h>
  38 #include <linux/init.h>
  39
  40 #include <asm/dma.h>
  41 #include <asm/ecard.h>
  42 #include <asm/hardware.h>
  43 #include <asm/io.h>
  44 #include <asm/irq.h>
  45 #include <asm/mmu_context.h>
  46 #include <asm/irqchip.h>
  47 #include <asm/tlbflush.h>
  48
  49 enum req {
  50         req_readbytes,
  51         req_reset
  52 };
  53
  54 struct ecard_request {
  55         enum req        req;
  56         ecard_t         *ec;
  57         unsigned int    address;
  58         unsigned int    length;
  59         unsigned int    use_loader;
  60         void            *buffer;
  61 };
  62
  63 struct expcard_blacklist {
  64         unsigned short   manufacturer;
  65         unsigned short   product;
  66         const char      *type;
  67 };
  68
  69 static ecard_t *cards;
  70 static ecard_t *slot_to_expcard[MAX_ECARDS];
  71 static unsigned int ectcr;
  72
  73 /* List of descriptions of cards which don't have an extended
  74  * identification, or chunk directories containing a description.
  75  */
  76 static struct expcard_blacklist __initdata blacklist[] = {
  77         { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
  78 };
  79
  80 asmlinkage extern int
  81 ecard_loader_reset(volatile unsigned char *pa, loader_t loader);
  82 asmlinkage extern int
  83 ecard_loader_read(int off, volatile unsigned char *pa, loader_t loader);
  84
  85 static const struct ecard_id *
  86 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec);
  87
  88 static inline unsigned short
  89 ecard_getu16(unsigned char *v)
  90 {
  91         return v[0] | v[1] << 8;
  92 }
  93
  94 static inline signed long
  95 ecard_gets24(unsigned char *v)
  96 {
  97         return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
  98 }
  99
 100 static inline ecard_t *
 101 slot_to_ecard(unsigned int slot)
 102 {
 103         return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
 104 }
 105
 106 /* ===================== Expansion card daemon ======================== */
 107 /*
 108  * Since the loader programs on the expansion cards need to be run
 109  * in a specific environment, create a separate task with this
 110  * environment up, and pass requests to this task as and when we
 111  * need to.
 112  *
 113  * This should allow 99% of loaders to be called from Linux.
 114  *
 115  * From a security standpoint, we trust the card vendors.  This
 116  * may be a misplaced trust.
 117  */
 118 #define BUS_ADDR(x) ((((unsigned long)(x)) << 2) + IO_BASE)
 119 #define POD_INT_ADDR(x) ((volatile unsigned char *)\
 120                          ((BUS_ADDR((x)) - IO_BASE) + IO_START))
 121
 122 static inline void ecard_task_reset(struct ecard_request *req)
 123 {
 124         struct expansion_card *ec = req->ec;
 125         if (ec->loader)
 126                 ecard_loader_reset(POD_INT_ADDR(ec->podaddr), ec->loader);
 127 }
 128
 129 static void
 130 ecard_task_readbytes(struct ecard_request *req)
 131 {
 132         unsigned char *buf = (unsigned char *)req->buffer;
 133         volatile unsigned char *base_addr =
 134                 (volatile unsigned char *)POD_INT_ADDR(req->ec->podaddr);
 135         unsigned int len = req->length;
 136         unsigned int off = req->address;
 137
 138         if (!req->use_loader || !req->ec->loader) {
 139                 off *= 4;
 140                 while (len--) {
 141                         *buf++ = base_addr[off];
 142                         off += 4;
 143                 }
 144         } else {
 145                 while(len--) {
 146                         /*
 147                          * The following is required by some
 148                          * expansion card loader programs.
 149                          */
 150                         *(unsigned long *)0x108 = 0;
 151                         *buf++ = ecard_loader_read(off++, base_addr,
 152                                                    req->ec->loader);
 153                 }
 154         }
 155 }
 156
 157 static void ecard_do_request(struct ecard_request *req)
 158 {
 159         switch (req->req) {
 160         case req_readbytes:
 161                 ecard_task_readbytes(req);
 162                 break;
 163
 164         case req_reset:
 165                 ecard_task_reset(req);
 166                 break;
 167         }
 168 }
 169
 170 /*
 171  * On 26-bit processors, we don't need the kcardd thread to access the
 172  * expansion card loaders.  We do it directly.
 173  */
 174 #define ecard_call(req) ecard_do_request(req)
 175
 176 /* ======================= Mid-level card control ===================== */
 177
 178 static void
 179 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
 180 {
 181         struct ecard_request req;
 182
 183         req.req         = req_readbytes;
 184         req.ec          = ec;
 185         req.address     = off;
 186         req.length      = len;
 187         req.use_loader  = useld;
 188         req.buffer      = addr;
 189
 190         ecard_call(&req);
 191 }
 192
 193 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
 194 {
 195         struct ex_chunk_dir excd;
 196         int index = 16;
 197         int useld = 0;
 198
 199         if (!ec->cid.cd)
 200                 return 0;
 201
 202         while(1) {
 203                 ecard_readbytes(&excd, ec, index, 8, useld);
 204                 index += 8;
 205                 if (c_id(&excd) == 0) {
 206                         if (!useld && ec->loader) {
 207                                 useld = 1;
 208                                 index = 0;
 209                                 continue;
 210                         }
 211                         return 0;
 212                 }
 213                 if (c_id(&excd) == 0xf0) { /* link */
 214                         index = c_start(&excd);
 215                         continue;
 216                 }
 217                 if (c_id(&excd) == 0x80) { /* loader */
 218                         if (!ec->loader) {
 219                                 ec->loader = (loader_t)kmalloc(c_len(&excd),
 220                                                                GFP_KERNEL);
 221                                 if (ec->loader)
 222                                         ecard_readbytes(ec->loader, ec,
 223                                                         (int)c_start(&excd),
 224                                                         c_len(&excd), useld);
 225                                 else
 226                                         return 0;
 227                         }
 228                         continue;
 229                 }
 230                 if (c_id(&excd) == id && num-- == 0)
 231                         break;
 232         }
 233
 234         if (c_id(&excd) & 0x80) {
 235                 switch (c_id(&excd) & 0x70) {
 236                 case 0x70:
 237                         ecard_readbytes((unsigned char *)excd.d.string, ec,
 238                                         (int)c_start(&excd), c_len(&excd),
 239                                         useld);
 240                         break;
 241                 case 0x00:
 242                         break;
 243                 }
 244         }
 245         cd->start_offset = c_start(&excd);
 246         memcpy(cd->d.string, excd.d.string, 256);
 247         return 1;
 248 }
 249
 250 /* ======================= Interrupt control ============================ */
 251
 252 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 253 {
 254 }
 255
 256 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 257 {
 258 }
 259
 260 static int ecard_def_irq_pending(ecard_t *ec)
 261 {
 262         return !ec->irqmask || ec->irqaddr[0] & ec->irqmask;
 263 }
 264
 265 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 266 {
 267         panic("ecard_def_fiq_enable called - impossible");
 268 }
 269
 270 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 271 {
 272         panic("ecard_def_fiq_disable called - impossible");
 273 }
 274
 275 static int ecard_def_fiq_pending(ecard_t *ec)
 276 {
 277         return !ec->fiqmask || ec->fiqaddr[0] & ec->fiqmask;
 278 }
 279
 280 static expansioncard_ops_t ecard_default_ops = {
 281         ecard_def_irq_enable,
 282         ecard_def_irq_disable,
 283         ecard_def_irq_pending,
 284         ecard_def_fiq_enable,
 285         ecard_def_fiq_disable,
 286         ecard_def_fiq_pending
 287 };
 288
 289 /*
 290  * Enable and disable interrupts from expansion cards.
 291  * (interrupts are disabled for these functions).
 292  *
 293  * They are not meant to be called directly, but via enable/disable_irq.
 294  */
 295 static void ecard_irq_unmask(unsigned int irqnr)
 296 {
 297         ecard_t *ec = slot_to_ecard(irqnr - 32);
 298
 299         if (ec) {
 300                 if (!ec->ops)
 301                         ec->ops = &ecard_default_ops;
 302
 303                 if (ec->claimed && ec->ops->irqenable)
 304                         ec->ops->irqenable(ec, irqnr);
 305                 else
 306                         printk(KERN_ERR "ecard: rejecting request to "
 307                                 "enable IRQs for %d\n", irqnr);
 308         }
 309 }
 310
 311 static void ecard_irq_mask(unsigned int irqnr)
 312 {
 313         ecard_t *ec = slot_to_ecard(irqnr - 32);
 314
 315         if (ec) {
 316                 if (!ec->ops)
 317                         ec->ops = &ecard_default_ops;
 318
 319                 if (ec->ops && ec->ops->irqdisable)
 320                         ec->ops->irqdisable(ec, irqnr);
 321         }
 322 }
 323
 324 static struct irqchip ecard_chip = {
 325         .ack    = ecard_irq_mask,
 326         .mask   = ecard_irq_mask,
 327         .unmask = ecard_irq_unmask,
 328 };
 329
 330 void ecard_enablefiq(unsigned int fiqnr)
 331 {
 332         ecard_t *ec = slot_to_ecard(fiqnr);
 333
 334         if (ec) {
 335                 if (!ec->ops)
 336                         ec->ops = &ecard_default_ops;
 337
 338                 if (ec->claimed && ec->ops->fiqenable)
 339                         ec->ops->fiqenable(ec, fiqnr);
 340                 else
 341                         printk(KERN_ERR "ecard: rejecting request to "
 342                                 "enable FIQs for %d\n", fiqnr);
 343         }
 344 }
 345
 346 void ecard_disablefiq(unsigned int fiqnr)
 347 {
 348         ecard_t *ec = slot_to_ecard(fiqnr);
 349
 350         if (ec) {
 351                 if (!ec->ops)
 352                         ec->ops = &ecard_default_ops;
 353
 354                 if (ec->ops->fiqdisable)
 355                         ec->ops->fiqdisable(ec, fiqnr);
 356         }
 357 }
 358
 359 static void
 360 ecard_dump_irq_state(ecard_t *ec)
 361 {
 362         printk("  %d: %sclaimed, ",
 363                ec->slot_no,
 364                ec->claimed ? "" : "not ");
 365
 366         if (ec->ops && ec->ops->irqpending &&
 367             ec->ops != &ecard_default_ops)
 368                 printk("irq %spending\n",
 369                        ec->ops->irqpending(ec) ? "" : "not ");
 370         else
 371                 printk("irqaddr %p, mask = %02X, status = %02X\n",
 372                        ec->irqaddr, ec->irqmask, *ec->irqaddr);
 373 }
 374
 375 static void ecard_check_lockup(struct irqdesc *desc)
 376 {
 377         static int last, lockup;
 378         ecard_t *ec;
 379
 380         /*
 381          * If the timer interrupt has not run since the last million
 382          * unrecognised expansion card interrupts, then there is
 383          * something seriously wrong.  Disable the expansion card
 384          * interrupts so at least we can continue.
 385          *
 386          * Maybe we ought to start a timer to re-enable them some time
 387          * later?
 388          */
 389         if (last == jiffies) {
 390                 lockup += 1;
 391                 if (lockup > 1000000) {
 392                         printk(KERN_ERR "\nInterrupt lockup detected - "
 393                                "disabling all expansion card interrupts\n");
 394
 395                         desc->chip->mask(IRQ_EXPANSIONCARD);
 396
 397                         printk("Expansion card IRQ state:\n");
 398
 399                         for (ec = cards; ec; ec = ec->next)
 400                                 ecard_dump_irq_state(ec);
 401                 }
 402         } else
 403                 lockup = 0;
 404
 405         /*
 406          * If we did not recognise the source of this interrupt,
 407          * warn the user, but don't flood the user with these messages.
 408          */
 409         if (!last || time_after(jiffies, (unsigned long)(last + 5*HZ))) {
 410                 last = jiffies;
 411                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 412         }
 413 }
 414
 415 static void
 416 ecard_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 417 {
 418         ecard_t *ec;
 419         int called = 0;
 420
 421         desc->chip->mask(irq);
 422         for (ec = cards; ec; ec = ec->next) {
 423                 int pending;
 424
 425                 if (!ec->claimed || ec->irq == NO_IRQ)
 426                         continue;
 427
 428                 if (ec->ops && ec->ops->irqpending)
 429                         pending = ec->ops->irqpending(ec);
 430                 else
 431                         pending = ecard_default_ops.irqpending(ec);
 432
 433                 if (pending) {
 434                         struct irqdesc *d = irq_desc + ec->irq;
 435                         d->handle(ec->irq, d, regs);
 436                         called ++;
 437                 }
 438         }
 439         desc->chip->unmask(irq);
 440
 441         if (called == 0)
 442                 ecard_check_lockup(desc);
 443 }
 444
 445 #define ecard_irqexp_handler NULL
 446 #define ecard_probeirqhw() (0)
 447
 448 unsigned int ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 449 {
 450         unsigned long address = 0;
 451         int slot = ec->slot_no;
 452
 453         ectcr &= ~(1 << slot);
 454
 455         switch (type) {
 456         case ECARD_MEMC:
 457                 address = IO_EC_MEMC_BASE + (slot << 12);
 458                 break;
 459
 460         case ECARD_IOC:
 461                 address = IO_EC_IOC_BASE + (slot << 12) + (speed << 17);
 462                 break;
 463
 464         default:
 465                 break;
 466         }
 467
 468         return address;
 469 }
 470
 471 static int ecard_prints(char *buffer, ecard_t *ec)
 472 {
 473         char *start = buffer;
 474
 475         buffer += sprintf(buffer, "  %d: ", ec->slot_no);
 476
 477         if (ec->cid.id == 0) {
 478                 struct in_chunk_dir incd;
 479
 480                 buffer += sprintf(buffer, "[%04X:%04X] ",
 481                         ec->cid.manufacturer, ec->cid.product);
 482
 483                 if (!ec->card_desc && ec->cid.cd &&
 484                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 485                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 486
 487                         if (ec->card_desc)
 488                                 strcpy((char *)ec->card_desc, incd.d.string);
 489                 }
 490
 491                 buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 492         } else
 493                 buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);
 494
 495         return buffer - start;
 496 }
 497
 498 static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
 499 {
 500         ecard_t *ec = cards;
 501         off_t at = 0;
 502         int len, cnt;
 503
 504         cnt = 0;
 505         while (ec && count > cnt) {
 506                 len = ecard_prints(buf, ec);
 507                 at += len;
 508                 if (at >= pos) {
 509                         if (!*start) {
 510                                 *start = buf + (pos - (at - len));
 511                                 cnt = at - pos;
 512                         } else
 513                                 cnt += len;
 514                         buf += len;
 515                 }
 516                 ec = ec->next;
 517         }
 518         return (count > cnt) ? cnt : count;
 519 }
 520
 521 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 522
 523 static void ecard_proc_init(void)
 524 {
 525         proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
 526         create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
 527                 get_ecard_dev_info);
 528 }
 529
 530 #define ec_set_resource(ec,nr,st,sz,flg)                        \
 531         do {                                                    \
 532                 (ec)->resource[nr].name = ec->dev.bus_id;       \
 533                 (ec)->resource[nr].start = st;                  \
 534                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 535                 (ec)->resource[nr].flags = flg;                 \
 536         } while (0)
 537
 538 static void __init ecard_init_resources(struct expansion_card *ec)
 539 {
 540         unsigned long base = PODSLOT_IOC0_BASE;
 541         unsigned int slot = ec->slot_no;
 542         int i;
 543
 544         ec_set_resource(ec, ECARD_RES_MEMC,
 545                         PODSLOT_MEMC_BASE + (slot << 14),
 546                         PODSLOT_MEMC_SIZE, IORESOURCE_MEM);
 547
 548         for (i = 0; i < ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++) {
 549                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 550                                 base + (slot << 14) + (i << 19),
 551                                 PODSLOT_IOC_SIZE, IORESOURCE_MEM);
 552         }
 553
 554         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 555                 if (ec->resource[i].start &&
 556                     request_resource(&iomem_resource, &ec->resource[i])) {
 557                         printk(KERN_ERR "%s: resource(s) not available\n",
 558                                 ec->dev.bus_id);
 559                         ec->resource[i].end -= ec->resource[i].start;
 560                         ec->resource[i].start = 0;
 561                 }
 562         }
 563 }
 564
 565 static ssize_t ecard_show_irq(struct device *dev, char *buf)
 566 {
 567         struct expansion_card *ec = ECARD_DEV(dev);
 568         return sprintf(buf, "%u\n", ec->irq);
 569 }
 570
 571 static ssize_t ecard_show_vendor(struct device *dev, char *buf)
 572 {
 573         struct expansion_card *ec = ECARD_DEV(dev);
 574         return sprintf(buf, "%u\n", ec->cid.manufacturer);
 575 }
 576
 577 static ssize_t ecard_show_device(struct device *dev, char *buf)
 578 {
 579         struct expansion_card *ec = ECARD_DEV(dev);
 580         return sprintf(buf, "%u\n", ec->cid.product);
 581 }
 582
 583 static ssize_t ecard_show_dma(struct device *dev, char *buf)
 584 {
 585         struct expansion_card *ec = ECARD_DEV(dev);
 586         return sprintf(buf, "%u\n", ec->dma);
 587 }
 588
 589 static ssize_t ecard_show_resources(struct device *dev, char *buf)
 590 {
 591         struct expansion_card *ec = ECARD_DEV(dev);
 592         char *str = buf;
 593         int i;
 594
 595         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 596                 str += sprintf(str, "%08lx %08lx %08lx\n",
 597                                 ec->resource[i].start,
 598                                 ec->resource[i].end,
 599                                 ec->resource[i].flags);
 600
 601         return str - buf;
 602 }
 603
 604 static DEVICE_ATTR(irq, S_IRUGO, ecard_show_irq, NULL);
 605 static DEVICE_ATTR(vendor, S_IRUGO, ecard_show_vendor, NULL);
 606 static DEVICE_ATTR(device, S_IRUGO, ecard_show_device, NULL);
 607 static DEVICE_ATTR(dma, S_IRUGO, ecard_show_dma, NULL);
 608 static DEVICE_ATTR(resource, S_IRUGO, ecard_show_resources, NULL);
 609
 610 /*
 611  * Probe for an expansion card.
 612  *
 613  * If bit 1 of the first byte of the card is set, then the
 614  * card does not exist.
 615  */
 616 static int __init
 617 ecard_probe(int slot, card_type_t type)
 618 {
 619         ecard_t **ecp;
 620         ecard_t *ec;
 621         struct ex_ecid cid;
 622         int i, rc = -ENOMEM;
 623
 624         ec = kmalloc(sizeof(ecard_t), GFP_KERNEL);
 625         if (!ec)
 626                 goto nomem;
 627
 628         memset(ec, 0, sizeof(ecard_t));
 629
 630         ec->slot_no     = slot;
 631         ec->type        = type;
 632         ec->irq         = NO_IRQ;
 633         ec->fiq         = NO_IRQ;
 634         ec->dma         = NO_DMA;
 635         ec->card_desc   = NULL;
 636         ec->ops         = &ecard_default_ops;
 637
 638         rc = -ENODEV;
 639         if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
 640                 goto nodev;
 641
 642         cid.r_zero = 1;
 643         ecard_readbytes(&cid, ec, 0, 16, 0);
 644         if (cid.r_zero)
 645                 goto nodev;
 646
 647         ec->cid.id      = cid.r_id;
 648         ec->cid.cd      = cid.r_cd;
 649         ec->cid.is      = cid.r_is;
 650         ec->cid.w       = cid.r_w;
 651         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
 652         ec->cid.product = ecard_getu16(cid.r_prod);
 653         ec->cid.country = cid.r_country;
 654         ec->cid.irqmask = cid.r_irqmask;
 655         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
 656         ec->cid.fiqmask = cid.r_fiqmask;
 657         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
 658         ec->fiqaddr     =
 659         ec->irqaddr     = (unsigned char *)ioaddr(ec->podaddr);
 660
 661         if (ec->cid.is) {
 662                 ec->irqmask = ec->cid.irqmask;
 663                 ec->irqaddr += ec->cid.irqoff;
 664                 ec->fiqmask = ec->cid.fiqmask;
 665                 ec->fiqaddr += ec->cid.fiqoff;
 666         } else {
 667                 ec->irqmask = 1;
 668                 ec->fiqmask = 4;
 669         }
 670
 671         for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++)
 672                 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
 673                     blacklist[i].product == ec->cid.product) {
 674                         ec->card_desc = blacklist[i].type;
 675                         break;
 676                 }
 677
 678         snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
 679         ec->dev.parent = NULL;
 680         ec->dev.bus    = &ecard_bus_type;
 681         ec->dev.dma_mask = &ec->dma_mask;
 682         ec->dma_mask = (u64)0xffffffff;
 683
 684         ecard_init_resources(ec);
 685
 686         /*
 687          * hook the interrupt handlers
 688          */
 689         ec->irq = 32 + slot;
 690         set_irq_chip(ec->irq, &ecard_chip);
 691         set_irq_handler(ec->irq, do_level_IRQ);
 692         set_irq_flags(ec->irq, IRQF_VALID);
 693
 694         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
 695
 696         *ecp = ec;
 697         slot_to_expcard[slot] = ec;
 698
 699         device_register(&ec->dev);
 700         device_create_file(&ec->dev, &dev_attr_dma);
 701         device_create_file(&ec->dev, &dev_attr_irq);
 702         device_create_file(&ec->dev, &dev_attr_resource);
 703         device_create_file(&ec->dev, &dev_attr_vendor);
 704         device_create_file(&ec->dev, &dev_attr_device);
 705
 706         return 0;
 707
 708 nodev:
 709         kfree(ec);
 710 nomem:
 711         return rc;
 712 }
 713
 714 /*
 715  * Initialise the expansion card system.
 716  * Locate all hardware - interrupt management and
 717  * actual cards.
 718  */
 719 static int __init ecard_init(void)
 720 {
 721         int slot, irqhw;
 722
 723         printk("Probing expansion cards\n");
 724
 725         for (slot = 0; slot < MAX_ECARDS; slot ++) {
 726                 ecard_probe(slot, ECARD_IOC);
 727         }
 728
 729         irqhw = ecard_probeirqhw();
 730
 731         set_irq_chained_handler(IRQ_EXPANSIONCARD,
 732                                 irqhw ? ecard_irqexp_handler : ecard_irq_handler);
 733
 734         ecard_proc_init();
 735
 736         return 0;
 737 }
 738
 739 subsys_initcall(ecard_init);
 740
 741 /*
 742  *      ECARD "bus"
 743  */
 744 static const struct ecard_id *
 745 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
 746 {
 747         int i;
 748
 749         for (i = 0; ids[i].manufacturer != 65535; i++)
 750                 if (ec->cid.manufacturer == ids[i].manufacturer &&
 751                     ec->cid.product == ids[i].product)
 752                         return ids + i;
 753
 754         return NULL;
 755 }
 756
 757 static int ecard_drv_probe(struct device *dev)
 758 {
 759         struct expansion_card *ec = ECARD_DEV(dev);
 760         struct ecard_driver *drv = ECARD_DRV(dev->driver);
 761         const struct ecard_id *id;
 762         int ret;
 763
 764         id = ecard_match_device(drv->id_table, ec);
 765
 766         ecard_claim(ec);
 767         ret = drv->probe(ec, id);
 768         if (ret)
 769                 ecard_release(ec);
 770         return ret;
 771 }
 772
 773 static int ecard_drv_remove(struct device *dev)
 774 {
 775         struct expansion_card *ec = ECARD_DEV(dev);
 776         struct ecard_driver *drv = ECARD_DRV(dev->driver);
 777
 778         drv->remove(ec);
 779         ecard_release(ec);
 780
 781         return 0;
 782 }
 783
 784 /*
 785  * Before rebooting, we must make sure that the expansion card is in a
 786  * sensible state, so it can be re-detected.  This means that the first
 787  * page of the ROM must be visible.  We call the expansion cards reset
 788  * handler, if any.
 789  */
 790 static void ecard_drv_shutdown(struct device *dev)
 791 {
 792         struct expansion_card *ec = ECARD_DEV(dev);
 793         struct ecard_driver *drv = ECARD_DRV(dev->driver);
 794         struct ecard_request req;
 795
 796         if (drv->shutdown)
 797                 drv->shutdown(ec);
 798         ecard_release(ec);
 799         req.req = req_reset;
 800         req.ec = ec;
 801         ecard_call(&req);
 802 }
 803
 804 int ecard_register_driver(struct ecard_driver *drv)
 805 {
 806         drv->drv.bus = &ecard_bus_type;
 807         drv->drv.probe = ecard_drv_probe;
 808         drv->drv.remove = ecard_drv_remove;
 809         drv->drv.shutdown = ecard_drv_shutdown;
 810
 811         return driver_register(&drv->drv);
 812 }
 813
 814 void ecard_remove_driver(struct ecard_driver *drv)
 815 {
 816         driver_unregister(&drv->drv);
 817 }
 818
 819 static int ecard_match(struct device *_dev, struct device_driver *_drv)
 820 {
 821         struct expansion_card *ec = ECARD_DEV(_dev);
 822         struct ecard_driver *drv = ECARD_DRV(_drv);
 823         int ret;
 824
 825         if (drv->id_table) {
 826                 ret = ecard_match_device(drv->id_table, ec) != NULL;
 827         } else {
 828                 ret = ec->cid.id == drv->id;
 829         }
 830
 831         return ret;
 832 }
 833
 834 struct bus_type ecard_bus_type = {
 835         .name   = "ecard",
 836         .match  = ecard_match,
 837 };
 838
 839 static int ecard_bus_init(void)
 840 {
 841         return bus_register(&ecard_bus_type);
 842 }
 843
 844 postcore_initcall(ecard_bus_init);
 845
 846 EXPORT_SYMBOL(ecard_readchunk);
 847 EXPORT_SYMBOL(ecard_address);
 848 EXPORT_SYMBOL(ecard_register_driver);
 849 EXPORT_SYMBOL(ecard_remove_driver);
 850 EXPORT_SYMBOL(ecard_bus_type);