arch/arm/kernel/ecard.c

   1 /*
   2  *  linux/arch/arm/kernel/ecard.c
   3  *
   4  *  Copyright 1995-2001 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Find all installed expansion cards, and handle interrupts from them.
  11  *
  12  *  Created from information from Acorns RiscOS3 PRMs
  13  *
  14  *  08-Dec-1996 RMK     Added code for the 9'th expansion card - the ether
  15  *                      podule slot.
  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  *  15-Feb-1998 RMK     Added DMA support
  24  *  12-Sep-1998 RMK     Added EASI support
  25  *  10-Jan-1999 RMK     Run loaders in a simulated RISC OS environment.
  26  *  17-Apr-1999 RMK     Support for EASI Type C cycles.
  27  */
  28 #define ECARD_C
  29
  30 #include <linux/config.h>
  31 #include <linux/module.h>
  32 #include <linux/kernel.h>
  33 #include <linux/types.h>
  34 #include <linux/sched.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/completion.h>
  37 #include <linux/reboot.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/device.h>
  42 #include <linux/init.h>
  43
  44 #include <asm/dma.h>
  45 #include <asm/ecard.h>
  46 #include <asm/hardware.h>
  47 #include <asm/io.h>
  48 #include <asm/irq.h>
  49 #include <asm/mmu_context.h>
  50 #include <asm/mach/irq.h>
  51 #include <asm/tlbflush.h>
  52
  53 #ifndef CONFIG_ARCH_RPC
  54 #define HAVE_EXPMASK
  55 #endif
  56
  57 struct ecard_request {
  58         void            (*fn)(struct ecard_request *);
  59         ecard_t         *ec;
  60         unsigned int    address;
  61         unsigned int    length;
  62         unsigned int    use_loader;
  63         void            *buffer;
  64         struct completion *complete;
  65 };
  66
  67 struct expcard_blacklist {
  68         unsigned short   manufacturer;
  69         unsigned short   product;
  70         const char      *type;
  71 };
  72
  73 static ecard_t *cards;
  74 static ecard_t *slot_to_expcard[MAX_ECARDS];
  75 static unsigned int ectcr;
  76 #ifdef HAS_EXPMASK
  77 static unsigned int have_expmask;
  78 #endif
  79
  80 /* List of descriptions of cards which don't have an extended
  81  * identification, or chunk directories containing a description.
  82  */
  83 static struct expcard_blacklist __initdata blacklist[] = {
  84         { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
  85 };
  86
  87 asmlinkage extern int
  88 ecard_loader_reset(volatile unsigned char *pa, loader_t loader);
  89 asmlinkage extern int
  90 ecard_loader_read(int off, volatile unsigned char *pa, loader_t loader);
  91
  92 static const struct ecard_id *
  93 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec);
  94
  95 static inline unsigned short
  96 ecard_getu16(unsigned char *v)
  97 {
  98         return v[0] | v[1] << 8;
  99 }
 100
 101 static inline signed long
 102 ecard_gets24(unsigned char *v)
 103 {
 104         return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
 105 }
 106
 107 static inline ecard_t *
 108 slot_to_ecard(unsigned int slot)
 109 {
 110         return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
 111 }
 112
 113 /* ===================== Expansion card daemon ======================== */
 114 /*
 115  * Since the loader programs on the expansion cards need to be run
 116  * in a specific environment, create a separate task with this
 117  * environment up, and pass requests to this task as and when we
 118  * need to.
 119  *
 120  * This should allow 99% of loaders to be called from Linux.
 121  *
 122  * From a security standpoint, we trust the card vendors.  This
 123  * may be a misplaced trust.
 124  */
 125 #define BUS_ADDR(x) ((((unsigned long)(x)) << 2) + IO_BASE)
 126 #define POD_INT_ADDR(x) ((volatile unsigned char *)\
 127                          ((BUS_ADDR((x)) - IO_BASE) + IO_START))
 128
 129 static void ecard_task_reset(struct ecard_request *req)
 130 {
 131         struct expansion_card *ec = req->ec;
 132         if (ec->loader)
 133                 ecard_loader_reset(POD_INT_ADDR(ec->podaddr), ec->loader);
 134 }
 135
 136 static void ecard_task_readbytes(struct ecard_request *req)
 137 {
 138         unsigned char *buf = (unsigned char *)req->buffer;
 139         volatile unsigned char *base_addr =
 140                 (volatile unsigned char *)POD_INT_ADDR(req->ec->podaddr);
 141         unsigned int len = req->length;
 142         unsigned int off = req->address;
 143
 144         if (req->ec->slot_no == 8) {
 145                 /*
 146                  * The card maintains an index which increments the address
 147                  * into a 4096-byte page on each access.  We need to keep
 148                  * track of the counter.
 149                  */
 150                 static unsigned int index;
 151                 unsigned int page;
 152
 153                 page = (off >> 12) * 4;
 154                 if (page > 256 * 4)
 155                         return;
 156
 157                 off &= 4095;
 158
 159                 /*
 160                  * If we are reading offset 0, or our current index is
 161                  * greater than the offset, reset the hardware index counter.
 162                  */
 163                 if (off == 0 || index > off) {
 164                         *base_addr = 0;
 165                         index = 0;
 166                 }
 167
 168                 /*
 169                  * Increment the hardware index counter until we get to the
 170                  * required offset.  The read bytes are discarded.
 171                  */
 172                 while (index < off) {
 173                         unsigned char byte;
 174                         byte = base_addr[page];
 175                         index += 1;
 176                 }
 177
 178                 while (len--) {
 179                         *buf++ = base_addr[page];
 180                         index += 1;
 181                 }
 182         } else {
 183
 184                 if (!req->use_loader || !req->ec->loader) {
 185                         off *= 4;
 186                         while (len--) {
 187                                 *buf++ = base_addr[off];
 188                                 off += 4;
 189                         }
 190                 } else {
 191                         while(len--) {
 192                                 /*
 193                                  * The following is required by some
 194                                  * expansion card loader programs.
 195                                  */
 196                                 *(unsigned long *)0x108 = 0;
 197                                 *buf++ = ecard_loader_read(off++, base_addr,
 198                                                            req->ec->loader);
 199                         }
 200                 }
 201         }
 202
 203 }
 204
 205 static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
 206 static struct ecard_request *ecard_req;
 207 static DECLARE_MUTEX(ecard_sem);
 208
 209 /*
 210  * Set up the expansion card daemon's page tables.
 211  */
 212 static void ecard_init_pgtables(struct mm_struct *mm)
 213 {
 214         struct vm_area_struct vma;
 215
 216         /* We want to set up the page tables for the following mapping:
 217          *  Virtual     Physical
 218          *  0x03000000  0x03000000
 219          *  0x03010000  unmapped
 220          *  0x03210000  0x03210000
 221          *  0x03400000  unmapped
 222          *  0x08000000  0x08000000
 223          *  0x10000000  unmapped
 224          *
 225          * FIXME: we don't follow this 100% yet.
 226          */
 227         pgd_t *src_pgd, *dst_pgd;
 228
 229         src_pgd = pgd_offset(mm, IO_BASE);
 230         dst_pgd = pgd_offset(mm, IO_START);
 231
 232         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));
 233
 234         src_pgd = pgd_offset(mm, EASI_BASE);
 235         dst_pgd = pgd_offset(mm, EASI_START);
 236
 237         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));
 238
 239         vma.vm_mm = mm;
 240
 241         flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
 242         flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
 243 }
 244
 245 static int ecard_init_mm(void)
 246 {
 247         struct mm_struct * mm = mm_alloc();
 248         struct mm_struct *active_mm = current->active_mm;
 249
 250         if (!mm)
 251                 return -ENOMEM;
 252
 253         current->mm = mm;
 254         current->active_mm = mm;
 255         activate_mm(active_mm, mm);
 256         mmdrop(active_mm);
 257         ecard_init_pgtables(mm);
 258         return 0;
 259 }
 260
 261 static int
 262 ecard_task(void * unused)
 263 {
 264         daemonize("kecardd");
 265
 266         /*
 267          * Allocate a mm.  We're not a lazy-TLB kernel task since we need
 268          * to set page table entries where the user space would be.  Note
 269          * that this also creates the page tables.  Failure is not an
 270          * option here.
 271          */
 272         if (ecard_init_mm())
 273                 panic("kecardd: unable to alloc mm\n");
 274
 275         while (1) {
 276                 struct ecard_request *req;
 277
 278                 wait_event_interruptible(ecard_wait, ecard_req != NULL);
 279
 280                 req = xchg(&ecard_req, NULL);
 281                 if (req != NULL) {
 282                         req->fn(req);
 283                         complete(req->complete);
 284                 }
 285         }
 286 }
 287
 288 /*
 289  * Wake the expansion card daemon to action our request.
 290  *
 291  * FIXME: The test here is not sufficient to detect if the
 292  * kcardd is running.
 293  */
 294 static void ecard_call(struct ecard_request *req)
 295 {
 296         DECLARE_COMPLETION(completion);
 297
 298         req->complete = &completion;
 299
 300         down(&ecard_sem);
 301         ecard_req = req;
 302         wake_up(&ecard_wait);
 303
 304         /*
 305          * Now wait for kecardd to run.
 306          */
 307         wait_for_completion(&completion);
 308         up(&ecard_sem);
 309 }
 310
 311 /* ======================= Mid-level card control ===================== */
 312
 313 static void
 314 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
 315 {
 316         struct ecard_request req;
 317
 318         req.fn          = ecard_task_readbytes;
 319         req.ec          = ec;
 320         req.address     = off;
 321         req.length      = len;
 322         req.use_loader  = useld;
 323         req.buffer      = addr;
 324
 325         ecard_call(&req);
 326 }
 327
 328 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
 329 {
 330         struct ex_chunk_dir excd;
 331         int index = 16;
 332         int useld = 0;
 333
 334         if (!ec->cid.cd)
 335                 return 0;
 336
 337         while(1) {
 338                 ecard_readbytes(&excd, ec, index, 8, useld);
 339                 index += 8;
 340                 if (c_id(&excd) == 0) {
 341                         if (!useld && ec->loader) {
 342                                 useld = 1;
 343                                 index = 0;
 344                                 continue;
 345                         }
 346                         return 0;
 347                 }
 348                 if (c_id(&excd) == 0xf0) { /* link */
 349                         index = c_start(&excd);
 350                         continue;
 351                 }
 352                 if (c_id(&excd) == 0x80) { /* loader */
 353                         if (!ec->loader) {
 354                                 ec->loader = (loader_t)kmalloc(c_len(&excd),
 355                                                                GFP_KERNEL);
 356                                 if (ec->loader)
 357                                         ecard_readbytes(ec->loader, ec,
 358                                                         (int)c_start(&excd),
 359                                                         c_len(&excd), useld);
 360                                 else
 361                                         return 0;
 362                         }
 363                         continue;
 364                 }
 365                 if (c_id(&excd) == id && num-- == 0)
 366                         break;
 367         }
 368
 369         if (c_id(&excd) & 0x80) {
 370                 switch (c_id(&excd) & 0x70) {
 371                 case 0x70:
 372                         ecard_readbytes((unsigned char *)excd.d.string, ec,
 373                                         (int)c_start(&excd), c_len(&excd),
 374                                         useld);
 375                         break;
 376                 case 0x00:
 377                         break;
 378                 }
 379         }
 380         cd->start_offset = c_start(&excd);
 381         memcpy(cd->d.string, excd.d.string, 256);
 382         return 1;
 383 }
 384
 385 /* ======================= Interrupt control ============================ */
 386
 387 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 388 {
 389 #ifdef HAS_EXPMASK
 390         if (irqnr < 4 && have_expmask) {
 391                 have_expmask |= 1 << irqnr;
 392                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 393         }
 394 #endif
 395 }
 396
 397 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 398 {
 399 #ifdef HAS_EXPMASK
 400         if (irqnr < 4 && have_expmask) {
 401                 have_expmask &= ~(1 << irqnr);
 402                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 403         }
 404 #endif
 405 }
 406
 407 static int ecard_def_irq_pending(ecard_t *ec)
 408 {
 409         return !ec->irqmask || ec->irqaddr[0] & ec->irqmask;
 410 }
 411
 412 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 413 {
 414         panic("ecard_def_fiq_enable called - impossible");
 415 }
 416
 417 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 418 {
 419         panic("ecard_def_fiq_disable called - impossible");
 420 }
 421
 422 static int ecard_def_fiq_pending(ecard_t *ec)
 423 {
 424         return !ec->fiqmask || ec->fiqaddr[0] & ec->fiqmask;
 425 }
 426
 427 static expansioncard_ops_t ecard_default_ops = {
 428         ecard_def_irq_enable,
 429         ecard_def_irq_disable,
 430         ecard_def_irq_pending,
 431         ecard_def_fiq_enable,
 432         ecard_def_fiq_disable,
 433         ecard_def_fiq_pending
 434 };
 435
 436 /*
 437  * Enable and disable interrupts from expansion cards.
 438  * (interrupts are disabled for these functions).
 439  *
 440  * They are not meant to be called directly, but via enable/disable_irq.
 441  */
 442 static void ecard_irq_unmask(unsigned int irqnr)
 443 {
 444         ecard_t *ec = slot_to_ecard(irqnr - 32);
 445
 446         if (ec) {
 447                 if (!ec->ops)
 448                         ec->ops = &ecard_default_ops;
 449
 450                 if (ec->claimed && ec->ops->irqenable)
 451                         ec->ops->irqenable(ec, irqnr);
 452                 else
 453                         printk(KERN_ERR "ecard: rejecting request to "
 454                                 "enable IRQs for %d\n", irqnr);
 455         }
 456 }
 457
 458 static void ecard_irq_mask(unsigned int irqnr)
 459 {
 460         ecard_t *ec = slot_to_ecard(irqnr - 32);
 461
 462         if (ec) {
 463                 if (!ec->ops)
 464                         ec->ops = &ecard_default_ops;
 465
 466                 if (ec->ops && ec->ops->irqdisable)
 467                         ec->ops->irqdisable(ec, irqnr);
 468         }
 469 }
 470
 471 static struct irqchip ecard_chip = {
 472         .ack    = ecard_irq_mask,
 473         .mask   = ecard_irq_mask,
 474         .unmask = ecard_irq_unmask,
 475 };
 476
 477 void ecard_enablefiq(unsigned int fiqnr)
 478 {
 479         ecard_t *ec = slot_to_ecard(fiqnr);
 480
 481         if (ec) {
 482                 if (!ec->ops)
 483                         ec->ops = &ecard_default_ops;
 484
 485                 if (ec->claimed && ec->ops->fiqenable)
 486                         ec->ops->fiqenable(ec, fiqnr);
 487                 else
 488                         printk(KERN_ERR "ecard: rejecting request to "
 489                                 "enable FIQs for %d\n", fiqnr);
 490         }
 491 }
 492
 493 void ecard_disablefiq(unsigned int fiqnr)
 494 {
 495         ecard_t *ec = slot_to_ecard(fiqnr);
 496
 497         if (ec) {
 498                 if (!ec->ops)
 499                         ec->ops = &ecard_default_ops;
 500
 501                 if (ec->ops->fiqdisable)
 502                         ec->ops->fiqdisable(ec, fiqnr);
 503         }
 504 }
 505
 506 static void ecard_dump_irq_state(void)
 507 {
 508         ecard_t *ec;
 509
 510         printk("Expansion card IRQ state:\n");
 511
 512         for (ec = cards; ec; ec = ec->next) {
 513                 if (ec->slot_no == 8)
 514                         continue;
 515
 516                 printk("  %d: %sclaimed, ",
 517                        ec->slot_no, ec->claimed ? "" : "not ");
 518
 519                 if (ec->ops && ec->ops->irqpending &&
 520                     ec->ops != &ecard_default_ops)
 521                         printk("irq %spending\n",
 522                                ec->ops->irqpending(ec) ? "" : "not ");
 523                 else
 524                         printk("irqaddr %p, mask = %02X, status = %02X\n",
 525                                ec->irqaddr, ec->irqmask, *ec->irqaddr);
 526         }
 527 }
 528
 529 static void ecard_check_lockup(struct irqdesc *desc)
 530 {
 531         static unsigned long last;
 532         static int lockup;
 533
 534         /*
 535          * If the timer interrupt has not run since the last million
 536          * unrecognised expansion card interrupts, then there is
 537          * something seriously wrong.  Disable the expansion card
 538          * interrupts so at least we can continue.
 539          *
 540          * Maybe we ought to start a timer to re-enable them some time
 541          * later?
 542          */
 543         if (last == jiffies) {
 544                 lockup += 1;
 545                 if (lockup > 1000000) {
 546                         printk(KERN_ERR "\nInterrupt lockup detected - "
 547                                "disabling all expansion card interrupts\n");
 548
 549                         desc->chip->mask(IRQ_EXPANSIONCARD);
 550                         ecard_dump_irq_state();
 551                 }
 552         } else
 553                 lockup = 0;
 554
 555         /*
 556          * If we did not recognise the source of this interrupt,
 557          * warn the user, but don't flood the user with these messages.
 558          */
 559         if (!last || time_after(jiffies, last + 5*HZ)) {
 560                 last = jiffies;
 561                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 562                 ecard_dump_irq_state();
 563         }
 564 }
 565
 566 static void
 567 ecard_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 568 {
 569         ecard_t *ec;
 570         int called = 0;
 571
 572         desc->chip->mask(irq);
 573         for (ec = cards; ec; ec = ec->next) {
 574                 int pending;
 575
 576                 if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
 577                         continue;
 578
 579                 if (ec->ops && ec->ops->irqpending)
 580                         pending = ec->ops->irqpending(ec);
 581                 else
 582                         pending = ecard_default_ops.irqpending(ec);
 583
 584                 if (pending) {
 585                         struct irqdesc *d = irq_desc + ec->irq;
 586                         d->handle(ec->irq, d, regs);
 587                         called ++;
 588                 }
 589         }
 590         desc->chip->unmask(irq);
 591
 592         if (called == 0)
 593                 ecard_check_lockup(desc);
 594 }
 595
 596 #ifdef HAS_EXPMASK
 597 static unsigned char priority_masks[] =
 598 {
 599         0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
 600 };
 601
 602 static unsigned char first_set[] =
 603 {
 604         0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
 605         0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
 606 };
 607
 608 static void
 609 ecard_irqexp_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 610 {
 611         const unsigned int statusmask = 15;
 612         unsigned int status;
 613
 614         status = __raw_readb(EXPMASK_STATUS) & statusmask;
 615         if (status) {
 616                 unsigned int slot = first_set[status];
 617                 ecard_t *ec = slot_to_ecard(slot);
 618
 619                 if (ec->claimed) {
 620                         struct irqdesc *d = irqdesc + ec->irq;
 621                         /*
 622                          * this ugly code is so that we can operate a
 623                          * prioritorising system:
 624                          *
 625                          * Card 0       highest priority
 626                          * Card 1
 627                          * Card 2
 628                          * Card 3       lowest priority
 629                          *
 630                          * Serial cards should go in 0/1, ethernet/scsi in 2/3
 631                          * otherwise you will lose serial data at high speeds!
 632                          */
 633                         d->handle(ec->irq, d, regs);
 634                 } else {
 635                         printk(KERN_WARNING "card%d: interrupt from unclaimed "
 636                                "card???\n", slot);
 637                         have_expmask &= ~(1 << slot);
 638                         __raw_writeb(have_expmask, EXPMASK_ENABLE);
 639                 }
 640         } else
 641                 printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
 642 }
 643
 644 static int __init ecard_probeirqhw(void)
 645 {
 646         ecard_t *ec;
 647         int found;
 648
 649         __raw_writeb(0x00, EXPMASK_ENABLE);
 650         __raw_writeb(0xff, EXPMASK_STATUS);
 651         found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
 652         __raw_writeb(0xff, EXPMASK_ENABLE);
 653
 654         if (found) {
 655                 printk(KERN_DEBUG "Expansion card interrupt "
 656                        "management hardware found\n");
 657
 658                 /* for each card present, set a bit to '1' */
 659                 have_expmask = 0x80000000;
 660
 661                 for (ec = cards; ec; ec = ec->next)
 662                         have_expmask |= 1 << ec->slot_no;
 663
 664                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 665         }
 666
 667         return found;
 668 }
 669 #else
 670 #define ecard_irqexp_handler NULL
 671 #define ecard_probeirqhw() (0)
 672 #endif
 673
 674 #ifndef IO_EC_MEMC8_BASE
 675 #define IO_EC_MEMC8_BASE 0
 676 #endif
 677
 678 unsigned int ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 679 {
 680         unsigned long address = 0;
 681         int slot = ec->slot_no;
 682
 683         if (ec->slot_no == 8)
 684                 return IO_EC_MEMC8_BASE;
 685
 686         ectcr &= ~(1 << slot);
 687
 688         switch (type) {
 689         case ECARD_MEMC:
 690                 if (slot < 4)
 691                         address = IO_EC_MEMC_BASE + (slot << 12);
 692                 break;
 693
 694         case ECARD_IOC:
 695                 if (slot < 4)
 696                         address = IO_EC_IOC_BASE + (slot << 12);
 697 #ifdef IO_EC_IOC4_BASE
 698                 else
 699                         address = IO_EC_IOC4_BASE + ((slot - 4) << 12);
 700 #endif
 701                 if (address)
 702                         address +=  speed << 17;
 703                 break;
 704
 705 #ifdef IO_EC_EASI_BASE
 706         case ECARD_EASI:
 707                 address = IO_EC_EASI_BASE + (slot << 22);
 708                 if (speed == ECARD_FAST)
 709                         ectcr |= 1 << slot;
 710                 break;
 711 #endif
 712         default:
 713                 break;
 714         }
 715
 716 #ifdef IOMD_ECTCR
 717         iomd_writeb(ectcr, IOMD_ECTCR);
 718 #endif
 719         return address;
 720 }
 721
 722 static int ecard_prints(char *buffer, ecard_t *ec)
 723 {
 724         char *start = buffer;
 725
 726         buffer += sprintf(buffer, "  %d: %s ", ec->slot_no,
 727                           ec->type == ECARD_EASI ? "EASI" : "    ");
 728
 729         if (ec->cid.id == 0) {
 730                 struct in_chunk_dir incd;
 731
 732                 buffer += sprintf(buffer, "[%04X:%04X] ",
 733                         ec->cid.manufacturer, ec->cid.product);
 734
 735                 if (!ec->card_desc && ec->cid.cd &&
 736                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 737                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 738
 739                         if (ec->card_desc)
 740                                 strcpy((char *)ec->card_desc, incd.d.string);
 741                 }
 742
 743                 buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 744         } else
 745                 buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);
 746
 747         return buffer - start;
 748 }
 749
 750 static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
 751 {
 752         ecard_t *ec = cards;
 753         off_t at = 0;
 754         int len, cnt;
 755
 756         cnt = 0;
 757         while (ec && count > cnt) {
 758                 len = ecard_prints(buf, ec);
 759                 at += len;
 760                 if (at >= pos) {
 761                         if (!*start) {
 762                                 *start = buf + (pos - (at - len));
 763                                 cnt = at - pos;
 764                         } else
 765                                 cnt += len;
 766                         buf += len;
 767                 }
 768                 ec = ec->next;
 769         }
 770         return (count > cnt) ? cnt : count;
 771 }
 772
 773 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 774
 775 static void ecard_proc_init(void)
 776 {
 777         proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
 778         create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
 779                 get_ecard_dev_info);
 780 }
 781
 782 #define ec_set_resource(ec,nr,st,sz,flg)                        \
 783         do {                                                    \
 784                 (ec)->resource[nr].name = ec->dev.bus_id;       \
 785                 (ec)->resource[nr].start = st;                  \
 786                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 787                 (ec)->resource[nr].flags = flg;                 \
 788         } while (0)
 789
 790 static void __init ecard_init_resources(struct expansion_card *ec)
 791 {
 792         unsigned long base = PODSLOT_IOC4_BASE;
 793         unsigned int slot = ec->slot_no;
 794         int i;
 795
 796         if (slot < 4) {
 797                 ec_set_resource(ec, ECARD_RES_MEMC,
 798                                 PODSLOT_MEMC_BASE + (slot << 14),
 799                                 PODSLOT_MEMC_SIZE, IORESOURCE_MEM);
 800                 base = PODSLOT_IOC0_BASE;
 801         }
 802
 803 #ifdef CONFIG_ARCH_RPC
 804         if (slot < 8) {
 805                 ec_set_resource(ec, ECARD_RES_EASI,
 806                                 PODSLOT_EASI_BASE + (slot << 24),
 807                                 PODSLOT_EASI_SIZE, IORESOURCE_MEM);
 808         }
 809
 810         if (slot == 8) {
 811                 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE,
 812                                 NETSLOT_SIZE, IORESOURCE_MEM);
 813         } else
 814 #endif
 815
 816         for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++) {
 817                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 818                                 base + (slot << 14) + (i << 19),
 819                                 PODSLOT_IOC_SIZE, IORESOURCE_MEM);
 820         }
 821
 822         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 823                 if (ec->resource[i].start &&
 824                     request_resource(&iomem_resource, &ec->resource[i])) {
 825                         printk(KERN_ERR "%s: resource(s) not available\n",
 826                                 ec->dev.bus_id);
 827                         ec->resource[i].end -= ec->resource[i].start;
 828                         ec->resource[i].start = 0;
 829                 }
 830         }
 831 }
 832
 833 static ssize_t ecard_show_irq(struct device *dev, char *buf)
 834 {
 835         struct expansion_card *ec = ECARD_DEV(dev);
 836         return sprintf(buf, "%u\n", ec->irq);
 837 }
 838
 839 static DEVICE_ATTR(irq, S_IRUGO, ecard_show_irq, NULL);
 840
 841 static ssize_t ecard_show_dma(struct device *dev, char *buf)
 842 {
 843         struct expansion_card *ec = ECARD_DEV(dev);
 844         return sprintf(buf, "%u\n", ec->dma);
 845 }
 846
 847 static DEVICE_ATTR(dma, S_IRUGO, ecard_show_dma, NULL);
 848
 849 static ssize_t ecard_show_resources(struct device *dev, char *buf)
 850 {
 851         struct expansion_card *ec = ECARD_DEV(dev);
 852         char *str = buf;
 853         int i;
 854
 855         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 856                 str += sprintf(str, "%08lx %08lx %08lx\n",
 857                                 ec->resource[i].start,
 858                                 ec->resource[i].end,
 859                                 ec->resource[i].flags);
 860
 861         return str - buf;
 862 }
 863
 864 static DEVICE_ATTR(resource, S_IRUGO, ecard_show_resources, NULL);
 865
 866 static ssize_t ecard_show_vendor(struct device *dev, char *buf)
 867 {
 868         struct expansion_card *ec = ECARD_DEV(dev);
 869         return sprintf(buf, "%u\n", ec->cid.manufacturer);
 870 }
 871
 872 static DEVICE_ATTR(vendor, S_IRUGO, ecard_show_vendor, NULL);
 873
 874 static ssize_t ecard_show_device(struct device *dev, char *buf)
 875 {
 876         struct expansion_card *ec = ECARD_DEV(dev);
 877         return sprintf(buf, "%u\n", ec->cid.product);
 878 }
 879
 880 static DEVICE_ATTR(device, S_IRUGO, ecard_show_device, NULL);
 881
 882
 883 int ecard_request_resources(struct expansion_card *ec)
 884 {
 885         int i, err = 0;
 886
 887         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 888                 if (ecard_resource_end(ec, i) &&
 889                     !request_mem_region(ecard_resource_start(ec, i),
 890                                         ecard_resource_len(ec, i),
 891                                         ec->dev.driver->name)) {
 892                         err = -EBUSY;
 893                         break;
 894                 }
 895         }
 896
 897         if (err) {
 898                 while (i--)
 899                         if (ecard_resource_end(ec, i))
 900                                 release_mem_region(ecard_resource_start(ec, i),
 901                                                    ecard_resource_len(ec, i));
 902         }
 903         return err;
 904 }
 905 EXPORT_SYMBOL(ecard_request_resources);
 906
 907 void ecard_release_resources(struct expansion_card *ec)
 908 {
 909         int i;
 910
 911         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 912                 if (ecard_resource_end(ec, i))
 913                         release_mem_region(ecard_resource_start(ec, i),
 914                                            ecard_resource_len(ec, i));
 915 }
 916 EXPORT_SYMBOL(ecard_release_resources);
 917
 918 /*
 919  * Probe for an expansion card.
 920  *
 921  * If bit 1 of the first byte of the card is set, then the
 922  * card does not exist.
 923  */
 924 static int __init
 925 ecard_probe(int slot, card_type_t type)
 926 {
 927         ecard_t **ecp;
 928         ecard_t *ec;
 929         struct ex_ecid cid;
 930         int i, rc = -ENOMEM;
 931
 932         ec = kmalloc(sizeof(ecard_t), GFP_KERNEL);
 933         if (!ec)
 934                 goto nomem;
 935
 936         memset(ec, 0, sizeof(ecard_t));
 937
 938         ec->slot_no     = slot;
 939         ec->type        = type;
 940         ec->irq         = NO_IRQ;
 941         ec->fiq         = NO_IRQ;
 942         ec->dma         = NO_DMA;
 943         ec->card_desc   = NULL;
 944         ec->ops         = &ecard_default_ops;
 945
 946         rc = -ENODEV;
 947         if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
 948                 goto nodev;
 949
 950         cid.r_zero = 1;
 951         ecard_readbytes(&cid, ec, 0, 16, 0);
 952         if (cid.r_zero)
 953                 goto nodev;
 954
 955         ec->cid.id      = cid.r_id;
 956         ec->cid.cd      = cid.r_cd;
 957         ec->cid.is      = cid.r_is;
 958         ec->cid.w       = cid.r_w;
 959         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
 960         ec->cid.product = ecard_getu16(cid.r_prod);
 961         ec->cid.country = cid.r_country;
 962         ec->cid.irqmask = cid.r_irqmask;
 963         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
 964         ec->cid.fiqmask = cid.r_fiqmask;
 965         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
 966         ec->fiqaddr     =
 967         ec->irqaddr     = (unsigned char *)ioaddr(ec->podaddr);
 968
 969         if (ec->cid.is) {
 970                 ec->irqmask = ec->cid.irqmask;
 971                 ec->irqaddr += ec->cid.irqoff;
 972                 ec->fiqmask = ec->cid.fiqmask;
 973                 ec->fiqaddr += ec->cid.fiqoff;
 974         } else {
 975                 ec->irqmask = 1;
 976                 ec->fiqmask = 4;
 977         }
 978
 979         for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++)
 980                 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
 981                     blacklist[i].product == ec->cid.product) {
 982                         ec->card_desc = blacklist[i].type;
 983                         break;
 984                 }
 985
 986         snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
 987         ec->dev.parent = NULL;
 988         ec->dev.bus    = &ecard_bus_type;
 989         ec->dev.dma_mask = &ec->dma_mask;
 990         ec->dma_mask = (u64)0xffffffff;
 991
 992         ecard_init_resources(ec);
 993
 994         /*
 995          * hook the interrupt handlers
 996          */
 997         if (slot < 8) {
 998                 ec->irq = 32 + slot;
 999                 set_irq_chip(ec->irq, &ecard_chip);
1000                 set_irq_handler(ec->irq, do_level_IRQ);
1001                 set_irq_flags(ec->irq, IRQF_VALID);
1002         }
1003
1004 #ifdef IO_EC_MEMC8_BASE
1005         if (slot == 8)
1006                 ec->irq = 11;
1007 #endif
1008 #ifdef CONFIG_ARCH_RPC
1009         /* On RiscPC, only first two slots have DMA capability */
1010         if (slot < 2)
1011                 ec->dma = 2 + slot;
1012 #endif
1013
1014         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
1015
1016         *ecp = ec;
1017         slot_to_expcard[slot] = ec;
1018
1019         device_register(&ec->dev);
1020         device_create_file(&ec->dev, &dev_attr_dma);
1021         device_create_file(&ec->dev, &dev_attr_irq);
1022         device_create_file(&ec->dev, &dev_attr_resource);
1023         device_create_file(&ec->dev, &dev_attr_vendor);
1024         device_create_file(&ec->dev, &dev_attr_device);
1025
1026         return 0;
1027
1028 nodev:
1029         kfree(ec);
1030 nomem:
1031         return rc;
1032 }
1033
1034 /*
1035  * Initialise the expansion card system.
1036  * Locate all hardware - interrupt management and
1037  * actual cards.
1038  */
1039 static int __init ecard_init(void)
1040 {
1041         int slot, irqhw, ret;
1042
1043         ret = kernel_thread(ecard_task, NULL, CLONE_KERNEL);
1044         if (ret < 0) {
1045                 printk(KERN_ERR "Ecard: unable to create kernel thread: %d\n",
1046                        ret);
1047                 return ret;
1048         }
1049
1050         printk("Probing expansion cards\n");
1051
1052         for (slot = 0; slot < 8; slot ++) {
1053                 if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
1054                         ecard_probe(slot, ECARD_IOC);
1055         }
1056
1057 #ifdef IO_EC_MEMC8_BASE
1058         ecard_probe(8, ECARD_IOC);
1059 #endif
1060
1061         irqhw = ecard_probeirqhw();
1062
1063         set_irq_chained_handler(IRQ_EXPANSIONCARD,
1064                                 irqhw ? ecard_irqexp_handler : ecard_irq_handler);
1065
1066         ecard_proc_init();
1067
1068         return 0;
1069 }
1070
1071 subsys_initcall(ecard_init);
1072
1073 /*
1074  *      ECARD "bus"
1075  */
1076 static const struct ecard_id *
1077 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1078 {
1079         int i;
1080
1081         for (i = 0; ids[i].manufacturer != 65535; i++)
1082                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1083                     ec->cid.product == ids[i].product)
1084                         return ids + i;
1085
1086         return NULL;
1087 }
1088
1089 static int ecard_drv_probe(struct device *dev)
1090 {
1091         struct expansion_card *ec = ECARD_DEV(dev);
1092         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1093         const struct ecard_id *id;
1094         int ret;
1095
1096         id = ecard_match_device(drv->id_table, ec);
1097
1098         ecard_claim(ec);
1099         ret = drv->probe(ec, id);
1100         if (ret)
1101                 ecard_release(ec);
1102         return ret;
1103 }
1104
1105 static int ecard_drv_remove(struct device *dev)
1106 {
1107         struct expansion_card *ec = ECARD_DEV(dev);
1108         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1109
1110         drv->remove(ec);
1111         ecard_release(ec);
1112
1113         return 0;
1114 }
1115
1116 /*
1117  * Before rebooting, we must make sure that the expansion card is in a
1118  * sensible state, so it can be re-detected.  This means that the first
1119  * page of the ROM must be visible.  We call the expansion cards reset
1120  * handler, if any.
1121  */
1122 static void ecard_drv_shutdown(struct device *dev)
1123 {
1124         struct expansion_card *ec = ECARD_DEV(dev);
1125         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1126         struct ecard_request req;
1127
1128         if (drv->shutdown)
1129                 drv->shutdown(ec);
1130         ecard_release(ec);
1131         req.fn = ecard_task_reset;
1132         req.ec = ec;
1133         ecard_call(&req);
1134 }
1135
1136 int ecard_register_driver(struct ecard_driver *drv)
1137 {
1138         drv->drv.bus = &ecard_bus_type;
1139         drv->drv.probe = ecard_drv_probe;
1140         drv->drv.remove = ecard_drv_remove;
1141         drv->drv.shutdown = ecard_drv_shutdown;
1142
1143         return driver_register(&drv->drv);
1144 }
1145
1146 void ecard_remove_driver(struct ecard_driver *drv)
1147 {
1148         driver_unregister(&drv->drv);
1149 }
1150
1151 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1152 {
1153         struct expansion_card *ec = ECARD_DEV(_dev);
1154         struct ecard_driver *drv = ECARD_DRV(_drv);
1155         int ret;
1156
1157         if (drv->id_table) {
1158                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1159         } else {
1160                 ret = ec->cid.id == drv->id;
1161         }
1162
1163         return ret;
1164 }
1165
1166 struct bus_type ecard_bus_type = {
1167         .name   = "ecard",
1168         .match  = ecard_match,
1169 };
1170
1171 static int ecard_bus_init(void)
1172 {
1173         return bus_register(&ecard_bus_type);
1174 }
1175
1176 postcore_initcall(ecard_bus_init);
1177
1178 EXPORT_SYMBOL(ecard_readchunk);
1179 EXPORT_SYMBOL(ecard_address);
1180 EXPORT_SYMBOL(ecard_register_driver);
1181 EXPORT_SYMBOL(ecard_remove_driver);
1182 EXPORT_SYMBOL(ecard_bus_type);