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 #include <linux/mutex.h>
  44
  45 #include <asm/dma.h>
  46 #include <asm/ecard.h>
  47 #include <asm/hardware.h>
  48 #include <asm/io.h>
  49 #include <asm/irq.h>
  50 #include <asm/mmu_context.h>
  51 #include <asm/mach/irq.h>
  52 #include <asm/tlbflush.h>
  53
  54 #ifndef CONFIG_ARCH_RPC
  55 #define HAVE_EXPMASK
  56 #endif
  57
  58 struct ecard_request {
  59         void            (*fn)(struct ecard_request *);
  60         ecard_t         *ec;
  61         unsigned int    address;
  62         unsigned int    length;
  63         unsigned int    use_loader;
  64         void            *buffer;
  65         struct completion *complete;
  66 };
  67
  68 struct expcard_blacklist {
  69         unsigned short   manufacturer;
  70         unsigned short   product;
  71         const char      *type;
  72 };
  73
  74 static ecard_t *cards;
  75 static ecard_t *slot_to_expcard[MAX_ECARDS];
  76 static unsigned int ectcr;
  77 #ifdef HAS_EXPMASK
  78 static unsigned int have_expmask;
  79 #endif
  80
  81 /* List of descriptions of cards which don't have an extended
  82  * identification, or chunk directories containing a description.
  83  */
  84 static struct expcard_blacklist __initdata blacklist[] = {
  85         { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
  86 };
  87
  88 asmlinkage extern int
  89 ecard_loader_reset(unsigned long base, loader_t loader);
  90 asmlinkage extern int
  91 ecard_loader_read(int off, unsigned long base, loader_t loader);
  92
  93 static inline unsigned short ecard_getu16(unsigned char *v)
  94 {
  95         return v[0] | v[1] << 8;
  96 }
  97
  98 static inline signed long ecard_gets24(unsigned char *v)
  99 {
 100         return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
 101 }
 102
 103 static inline ecard_t *slot_to_ecard(unsigned int slot)
 104 {
 105         return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
 106 }
 107
 108 /* ===================== Expansion card daemon ======================== */
 109 /*
 110  * Since the loader programs on the expansion cards need to be run
 111  * in a specific environment, create a separate task with this
 112  * environment up, and pass requests to this task as and when we
 113  * need to.
 114  *
 115  * This should allow 99% of loaders to be called from Linux.
 116  *
 117  * From a security standpoint, we trust the card vendors.  This
 118  * may be a misplaced trust.
 119  */
 120 static void ecard_task_reset(struct ecard_request *req)
 121 {
 122         struct expansion_card *ec = req->ec;
 123         struct resource *res;
 124
 125         res = ec->slot_no == 8
 126                 ? &ec->resource[ECARD_RES_MEMC]
 127                 : ec->type == ECARD_EASI
 128                   ? &ec->resource[ECARD_RES_EASI]
 129                   : &ec->resource[ECARD_RES_IOCSYNC];
 130
 131         ecard_loader_reset(res->start, ec->loader);
 132 }
 133
 134 static void ecard_task_readbytes(struct ecard_request *req)
 135 {
 136         struct expansion_card *ec = req->ec;
 137         unsigned char *buf = req->buffer;
 138         unsigned int len = req->length;
 139         unsigned int off = req->address;
 140
 141         if (ec->slot_no == 8) {
 142                 void __iomem *base = (void __iomem *)
 143                                 ec->resource[ECARD_RES_MEMC].start;
 144
 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                         writeb(0, base);
 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                         readb(base + page);
 174                         index += 1;
 175                 }
 176
 177                 while (len--) {
 178                         *buf++ = readb(base + page);
 179                         index += 1;
 180                 }
 181         } else {
 182                 unsigned long base = (ec->type == ECARD_EASI
 183                          ? &ec->resource[ECARD_RES_EASI]
 184                          : &ec->resource[ECARD_RES_IOCSYNC])->start;
 185                 void __iomem *pbase = (void __iomem *)base;
 186
 187                 if (!req->use_loader || !ec->loader) {
 188                         off *= 4;
 189                         while (len--) {
 190                                 *buf++ = readb(pbase + off);
 191                                 off += 4;
 192                         }
 193                 } else {
 194                         while(len--) {
 195                                 /*
 196                                  * The following is required by some
 197                                  * expansion card loader programs.
 198                                  */
 199                                 *(unsigned long *)0x108 = 0;
 200                                 *buf++ = ecard_loader_read(off++, base,
 201                                                            ec->loader);
 202                         }
 203                 }
 204         }
 205
 206 }
 207
 208 static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
 209 static struct ecard_request *ecard_req;
 210 static DEFINE_MUTEX(ecard_mutex);
 211
 212 /*
 213  * Set up the expansion card daemon's page tables.
 214  */
 215 static void ecard_init_pgtables(struct mm_struct *mm)
 216 {
 217         struct vm_area_struct vma;
 218
 219         /* We want to set up the page tables for the following mapping:
 220          *  Virtual     Physical
 221          *  0x03000000  0x03000000
 222          *  0x03010000  unmapped
 223          *  0x03210000  0x03210000
 224          *  0x03400000  unmapped
 225          *  0x08000000  0x08000000
 226          *  0x10000000  unmapped
 227          *
 228          * FIXME: we don't follow this 100% yet.
 229          */
 230         pgd_t *src_pgd, *dst_pgd;
 231
 232         src_pgd = pgd_offset(mm, (unsigned long)IO_BASE);
 233         dst_pgd = pgd_offset(mm, IO_START);
 234
 235         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));
 236
 237         src_pgd = pgd_offset(mm, EASI_BASE);
 238         dst_pgd = pgd_offset(mm, EASI_START);
 239
 240         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));
 241
 242         vma.vm_mm = mm;
 243
 244         flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
 245         flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
 246 }
 247
 248 static int ecard_init_mm(void)
 249 {
 250         struct mm_struct * mm = mm_alloc();
 251         struct mm_struct *active_mm = current->active_mm;
 252
 253         if (!mm)
 254                 return -ENOMEM;
 255
 256         current->mm = mm;
 257         current->active_mm = mm;
 258         activate_mm(active_mm, mm);
 259         mmdrop(active_mm);
 260         ecard_init_pgtables(mm);
 261         return 0;
 262 }
 263
 264 static int
 265 ecard_task(void * unused)
 266 {
 267         daemonize("kecardd");
 268
 269         /*
 270          * Allocate a mm.  We're not a lazy-TLB kernel task since we need
 271          * to set page table entries where the user space would be.  Note
 272          * that this also creates the page tables.  Failure is not an
 273          * option here.
 274          */
 275         if (ecard_init_mm())
 276                 panic("kecardd: unable to alloc mm\n");
 277
 278         while (1) {
 279                 struct ecard_request *req;
 280
 281                 wait_event_interruptible(ecard_wait, ecard_req != NULL);
 282
 283                 req = xchg(&ecard_req, NULL);
 284                 if (req != NULL) {
 285                         req->fn(req);
 286                         complete(req->complete);
 287                 }
 288         }
 289 }
 290
 291 /*
 292  * Wake the expansion card daemon to action our request.
 293  *
 294  * FIXME: The test here is not sufficient to detect if the
 295  * kcardd is running.
 296  */
 297 static void ecard_call(struct ecard_request *req)
 298 {
 299         DECLARE_COMPLETION(completion);
 300
 301         req->complete = &completion;
 302
 303         mutex_lock(&ecard_mutex);
 304         ecard_req = req;
 305         wake_up(&ecard_wait);
 306
 307         /*
 308          * Now wait for kecardd to run.
 309          */
 310         wait_for_completion(&completion);
 311         mutex_unlock(&ecard_mutex);
 312 }
 313
 314 /* ======================= Mid-level card control ===================== */
 315
 316 static void
 317 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
 318 {
 319         struct ecard_request req;
 320
 321         req.fn          = ecard_task_readbytes;
 322         req.ec          = ec;
 323         req.address     = off;
 324         req.length      = len;
 325         req.use_loader  = useld;
 326         req.buffer      = addr;
 327
 328         ecard_call(&req);
 329 }
 330
 331 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
 332 {
 333         struct ex_chunk_dir excd;
 334         int index = 16;
 335         int useld = 0;
 336
 337         if (!ec->cid.cd)
 338                 return 0;
 339
 340         while(1) {
 341                 ecard_readbytes(&excd, ec, index, 8, useld);
 342                 index += 8;
 343                 if (c_id(&excd) == 0) {
 344                         if (!useld && ec->loader) {
 345                                 useld = 1;
 346                                 index = 0;
 347                                 continue;
 348                         }
 349                         return 0;
 350                 }
 351                 if (c_id(&excd) == 0xf0) { /* link */
 352                         index = c_start(&excd);
 353                         continue;
 354                 }
 355                 if (c_id(&excd) == 0x80) { /* loader */
 356                         if (!ec->loader) {
 357                                 ec->loader = (loader_t)kmalloc(c_len(&excd),
 358                                                                GFP_KERNEL);
 359                                 if (ec->loader)
 360                                         ecard_readbytes(ec->loader, ec,
 361                                                         (int)c_start(&excd),
 362                                                         c_len(&excd), useld);
 363                                 else
 364                                         return 0;
 365                         }
 366                         continue;
 367                 }
 368                 if (c_id(&excd) == id && num-- == 0)
 369                         break;
 370         }
 371
 372         if (c_id(&excd) & 0x80) {
 373                 switch (c_id(&excd) & 0x70) {
 374                 case 0x70:
 375                         ecard_readbytes((unsigned char *)excd.d.string, ec,
 376                                         (int)c_start(&excd), c_len(&excd),
 377                                         useld);
 378                         break;
 379                 case 0x00:
 380                         break;
 381                 }
 382         }
 383         cd->start_offset = c_start(&excd);
 384         memcpy(cd->d.string, excd.d.string, 256);
 385         return 1;
 386 }
 387
 388 /* ======================= Interrupt control ============================ */
 389
 390 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 391 {
 392 #ifdef HAS_EXPMASK
 393         if (irqnr < 4 && have_expmask) {
 394                 have_expmask |= 1 << irqnr;
 395                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 396         }
 397 #endif
 398 }
 399
 400 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 401 {
 402 #ifdef HAS_EXPMASK
 403         if (irqnr < 4 && have_expmask) {
 404                 have_expmask &= ~(1 << irqnr);
 405                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 406         }
 407 #endif
 408 }
 409
 410 static int ecard_def_irq_pending(ecard_t *ec)
 411 {
 412         return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
 413 }
 414
 415 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 416 {
 417         panic("ecard_def_fiq_enable called - impossible");
 418 }
 419
 420 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 421 {
 422         panic("ecard_def_fiq_disable called - impossible");
 423 }
 424
 425 static int ecard_def_fiq_pending(ecard_t *ec)
 426 {
 427         return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
 428 }
 429
 430 static expansioncard_ops_t ecard_default_ops = {
 431         ecard_def_irq_enable,
 432         ecard_def_irq_disable,
 433         ecard_def_irq_pending,
 434         ecard_def_fiq_enable,
 435         ecard_def_fiq_disable,
 436         ecard_def_fiq_pending
 437 };
 438
 439 /*
 440  * Enable and disable interrupts from expansion cards.
 441  * (interrupts are disabled for these functions).
 442  *
 443  * They are not meant to be called directly, but via enable/disable_irq.
 444  */
 445 static void ecard_irq_unmask(unsigned int irqnr)
 446 {
 447         ecard_t *ec = slot_to_ecard(irqnr - 32);
 448
 449         if (ec) {
 450                 if (!ec->ops)
 451                         ec->ops = &ecard_default_ops;
 452
 453                 if (ec->claimed && ec->ops->irqenable)
 454                         ec->ops->irqenable(ec, irqnr);
 455                 else
 456                         printk(KERN_ERR "ecard: rejecting request to "
 457                                 "enable IRQs for %d\n", irqnr);
 458         }
 459 }
 460
 461 static void ecard_irq_mask(unsigned int irqnr)
 462 {
 463         ecard_t *ec = slot_to_ecard(irqnr - 32);
 464
 465         if (ec) {
 466                 if (!ec->ops)
 467                         ec->ops = &ecard_default_ops;
 468
 469                 if (ec->ops && ec->ops->irqdisable)
 470                         ec->ops->irqdisable(ec, irqnr);
 471         }
 472 }
 473
 474 static struct irqchip ecard_chip = {
 475         .ack    = ecard_irq_mask,
 476         .mask   = ecard_irq_mask,
 477         .unmask = ecard_irq_unmask,
 478 };
 479
 480 void ecard_enablefiq(unsigned int fiqnr)
 481 {
 482         ecard_t *ec = slot_to_ecard(fiqnr);
 483
 484         if (ec) {
 485                 if (!ec->ops)
 486                         ec->ops = &ecard_default_ops;
 487
 488                 if (ec->claimed && ec->ops->fiqenable)
 489                         ec->ops->fiqenable(ec, fiqnr);
 490                 else
 491                         printk(KERN_ERR "ecard: rejecting request to "
 492                                 "enable FIQs for %d\n", fiqnr);
 493         }
 494 }
 495
 496 void ecard_disablefiq(unsigned int fiqnr)
 497 {
 498         ecard_t *ec = slot_to_ecard(fiqnr);
 499
 500         if (ec) {
 501                 if (!ec->ops)
 502                         ec->ops = &ecard_default_ops;
 503
 504                 if (ec->ops->fiqdisable)
 505                         ec->ops->fiqdisable(ec, fiqnr);
 506         }
 507 }
 508
 509 static void ecard_dump_irq_state(void)
 510 {
 511         ecard_t *ec;
 512
 513         printk("Expansion card IRQ state:\n");
 514
 515         for (ec = cards; ec; ec = ec->next) {
 516                 if (ec->slot_no == 8)
 517                         continue;
 518
 519                 printk("  %d: %sclaimed, ",
 520                        ec->slot_no, ec->claimed ? "" : "not ");
 521
 522                 if (ec->ops && ec->ops->irqpending &&
 523                     ec->ops != &ecard_default_ops)
 524                         printk("irq %spending\n",
 525                                ec->ops->irqpending(ec) ? "" : "not ");
 526                 else
 527                         printk("irqaddr %p, mask = %02X, status = %02X\n",
 528                                ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
 529         }
 530 }
 531
 532 static void ecard_check_lockup(struct irqdesc *desc)
 533 {
 534         static unsigned long last;
 535         static int lockup;
 536
 537         /*
 538          * If the timer interrupt has not run since the last million
 539          * unrecognised expansion card interrupts, then there is
 540          * something seriously wrong.  Disable the expansion card
 541          * interrupts so at least we can continue.
 542          *
 543          * Maybe we ought to start a timer to re-enable them some time
 544          * later?
 545          */
 546         if (last == jiffies) {
 547                 lockup += 1;
 548                 if (lockup > 1000000) {
 549                         printk(KERN_ERR "\nInterrupt lockup detected - "
 550                                "disabling all expansion card interrupts\n");
 551
 552                         desc->chip->mask(IRQ_EXPANSIONCARD);
 553                         ecard_dump_irq_state();
 554                 }
 555         } else
 556                 lockup = 0;
 557
 558         /*
 559          * If we did not recognise the source of this interrupt,
 560          * warn the user, but don't flood the user with these messages.
 561          */
 562         if (!last || time_after(jiffies, last + 5*HZ)) {
 563                 last = jiffies;
 564                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 565                 ecard_dump_irq_state();
 566         }
 567 }
 568
 569 static void
 570 ecard_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 571 {
 572         ecard_t *ec;
 573         int called = 0;
 574
 575         desc->chip->mask(irq);
 576         for (ec = cards; ec; ec = ec->next) {
 577                 int pending;
 578
 579                 if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
 580                         continue;
 581
 582                 if (ec->ops && ec->ops->irqpending)
 583                         pending = ec->ops->irqpending(ec);
 584                 else
 585                         pending = ecard_default_ops.irqpending(ec);
 586
 587                 if (pending) {
 588                         struct irqdesc *d = irq_desc + ec->irq;
 589                         desc_handle_irq(ec->irq, d, regs);
 590                         called ++;
 591                 }
 592         }
 593         desc->chip->unmask(irq);
 594
 595         if (called == 0)
 596                 ecard_check_lockup(desc);
 597 }
 598
 599 #ifdef HAS_EXPMASK
 600 static unsigned char priority_masks[] =
 601 {
 602         0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
 603 };
 604
 605 static unsigned char first_set[] =
 606 {
 607         0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
 608         0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
 609 };
 610
 611 static void
 612 ecard_irqexp_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 613 {
 614         const unsigned int statusmask = 15;
 615         unsigned int status;
 616
 617         status = __raw_readb(EXPMASK_STATUS) & statusmask;
 618         if (status) {
 619                 unsigned int slot = first_set[status];
 620                 ecard_t *ec = slot_to_ecard(slot);
 621
 622                 if (ec->claimed) {
 623                         struct irqdesc *d = irqdesc + ec->irq;
 624                         /*
 625                          * this ugly code is so that we can operate a
 626                          * prioritorising system:
 627                          *
 628                          * Card 0       highest priority
 629                          * Card 1
 630                          * Card 2
 631                          * Card 3       lowest priority
 632                          *
 633                          * Serial cards should go in 0/1, ethernet/scsi in 2/3
 634                          * otherwise you will lose serial data at high speeds!
 635                          */
 636                         desc_handle_irq(ec->irq, d, regs);
 637                 } else {
 638                         printk(KERN_WARNING "card%d: interrupt from unclaimed "
 639                                "card???\n", slot);
 640                         have_expmask &= ~(1 << slot);
 641                         __raw_writeb(have_expmask, EXPMASK_ENABLE);
 642                 }
 643         } else
 644                 printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
 645 }
 646
 647 static int __init ecard_probeirqhw(void)
 648 {
 649         ecard_t *ec;
 650         int found;
 651
 652         __raw_writeb(0x00, EXPMASK_ENABLE);
 653         __raw_writeb(0xff, EXPMASK_STATUS);
 654         found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
 655         __raw_writeb(0xff, EXPMASK_ENABLE);
 656
 657         if (found) {
 658                 printk(KERN_DEBUG "Expansion card interrupt "
 659                        "management hardware found\n");
 660
 661                 /* for each card present, set a bit to '1' */
 662                 have_expmask = 0x80000000;
 663
 664                 for (ec = cards; ec; ec = ec->next)
 665                         have_expmask |= 1 << ec->slot_no;
 666
 667                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 668         }
 669
 670         return found;
 671 }
 672 #else
 673 #define ecard_irqexp_handler NULL
 674 #define ecard_probeirqhw() (0)
 675 #endif
 676
 677 #ifndef IO_EC_MEMC8_BASE
 678 #define IO_EC_MEMC8_BASE 0
 679 #endif
 680
 681 unsigned int __ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 682 {
 683         unsigned long address = 0;
 684         int slot = ec->slot_no;
 685
 686         if (ec->slot_no == 8)
 687                 return IO_EC_MEMC8_BASE;
 688
 689         ectcr &= ~(1 << slot);
 690
 691         switch (type) {
 692         case ECARD_MEMC:
 693                 if (slot < 4)
 694                         address = IO_EC_MEMC_BASE + (slot << 12);
 695                 break;
 696
 697         case ECARD_IOC:
 698                 if (slot < 4)
 699                         address = IO_EC_IOC_BASE + (slot << 12);
 700 #ifdef IO_EC_IOC4_BASE
 701                 else
 702                         address = IO_EC_IOC4_BASE + ((slot - 4) << 12);
 703 #endif
 704                 if (address)
 705                         address +=  speed << 17;
 706                 break;
 707
 708 #ifdef IO_EC_EASI_BASE
 709         case ECARD_EASI:
 710                 address = IO_EC_EASI_BASE + (slot << 22);
 711                 if (speed == ECARD_FAST)
 712                         ectcr |= 1 << slot;
 713                 break;
 714 #endif
 715         default:
 716                 break;
 717         }
 718
 719 #ifdef IOMD_ECTCR
 720         iomd_writeb(ectcr, IOMD_ECTCR);
 721 #endif
 722         return address;
 723 }
 724
 725 static int ecard_prints(char *buffer, ecard_t *ec)
 726 {
 727         char *start = buffer;
 728
 729         buffer += sprintf(buffer, "  %d: %s ", ec->slot_no,
 730                           ec->type == ECARD_EASI ? "EASI" : "    ");
 731
 732         if (ec->cid.id == 0) {
 733                 struct in_chunk_dir incd;
 734
 735                 buffer += sprintf(buffer, "[%04X:%04X] ",
 736                         ec->cid.manufacturer, ec->cid.product);
 737
 738                 if (!ec->card_desc && ec->cid.cd &&
 739                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 740                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 741
 742                         if (ec->card_desc)
 743                                 strcpy((char *)ec->card_desc, incd.d.string);
 744                 }
 745
 746                 buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 747         } else
 748                 buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);
 749
 750         return buffer - start;
 751 }
 752
 753 static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
 754 {
 755         ecard_t *ec = cards;
 756         off_t at = 0;
 757         int len, cnt;
 758
 759         cnt = 0;
 760         while (ec && count > cnt) {
 761                 len = ecard_prints(buf, ec);
 762                 at += len;
 763                 if (at >= pos) {
 764                         if (!*start) {
 765                                 *start = buf + (pos - (at - len));
 766                                 cnt = at - pos;
 767                         } else
 768                                 cnt += len;
 769                         buf += len;
 770                 }
 771                 ec = ec->next;
 772         }
 773         return (count > cnt) ? cnt : count;
 774 }
 775
 776 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 777
 778 static void ecard_proc_init(void)
 779 {
 780         proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
 781         create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
 782                 get_ecard_dev_info);
 783 }
 784
 785 #define ec_set_resource(ec,nr,st,sz)                            \
 786         do {                                                    \
 787                 (ec)->resource[nr].name = ec->dev.bus_id;       \
 788                 (ec)->resource[nr].start = st;                  \
 789                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 790                 (ec)->resource[nr].flags = IORESOURCE_MEM;      \
 791         } while (0)
 792
 793 static void __init ecard_free_card(struct expansion_card *ec)
 794 {
 795         int i;
 796
 797         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 798                 if (ec->resource[i].flags)
 799                         release_resource(&ec->resource[i]);
 800
 801         kfree(ec);
 802 }
 803
 804 static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 805 {
 806         struct expansion_card *ec;
 807         unsigned long base;
 808         int i;
 809
 810         ec = kmalloc(sizeof(ecard_t), GFP_KERNEL);
 811         if (!ec) {
 812                 ec = ERR_PTR(-ENOMEM);
 813                 goto nomem;
 814         }
 815
 816         memset(ec, 0, sizeof(ecard_t));
 817
 818         ec->slot_no = slot;
 819         ec->type = type;
 820         ec->irq = NO_IRQ;
 821         ec->fiq = NO_IRQ;
 822         ec->dma = NO_DMA;
 823         ec->ops = &ecard_default_ops;
 824
 825         snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
 826         ec->dev.parent = NULL;
 827         ec->dev.bus = &ecard_bus_type;
 828         ec->dev.dma_mask = &ec->dma_mask;
 829         ec->dma_mask = (u64)0xffffffff;
 830
 831         if (slot < 4) {
 832                 ec_set_resource(ec, ECARD_RES_MEMC,
 833                                 PODSLOT_MEMC_BASE + (slot << 14),
 834                                 PODSLOT_MEMC_SIZE);
 835                 base = PODSLOT_IOC0_BASE + (slot << 14);
 836         } else
 837                 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
 838
 839 #ifdef CONFIG_ARCH_RPC
 840         if (slot < 8) {
 841                 ec_set_resource(ec, ECARD_RES_EASI,
 842                                 PODSLOT_EASI_BASE + (slot << 24),
 843                                 PODSLOT_EASI_SIZE);
 844         }
 845
 846         if (slot == 8) {
 847                 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
 848         } else
 849 #endif
 850
 851         for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
 852                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 853                                 base + (i << 19), PODSLOT_IOC_SIZE);
 854
 855         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 856                 if (ec->resource[i].flags &&
 857                     request_resource(&iomem_resource, &ec->resource[i])) {
 858                         printk(KERN_ERR "%s: resource(s) not available\n",
 859                                 ec->dev.bus_id);
 860                         ec->resource[i].end -= ec->resource[i].start;
 861                         ec->resource[i].start = 0;
 862                         ec->resource[i].flags = 0;
 863                 }
 864         }
 865
 866  nomem:
 867         return ec;
 868 }
 869
 870 static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf)
 871 {
 872         struct expansion_card *ec = ECARD_DEV(dev);
 873         return sprintf(buf, "%u\n", ec->irq);
 874 }
 875
 876 static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
 877 {
 878         struct expansion_card *ec = ECARD_DEV(dev);
 879         return sprintf(buf, "%u\n", ec->dma);
 880 }
 881
 882 static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
 883 {
 884         struct expansion_card *ec = ECARD_DEV(dev);
 885         char *str = buf;
 886         int i;
 887
 888         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 889                 str += sprintf(str, "%08lx %08lx %08lx\n",
 890                                 ec->resource[i].start,
 891                                 ec->resource[i].end,
 892                                 ec->resource[i].flags);
 893
 894         return str - buf;
 895 }
 896
 897 static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf)
 898 {
 899         struct expansion_card *ec = ECARD_DEV(dev);
 900         return sprintf(buf, "%u\n", ec->cid.manufacturer);
 901 }
 902
 903 static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
 904 {
 905         struct expansion_card *ec = ECARD_DEV(dev);
 906         return sprintf(buf, "%u\n", ec->cid.product);
 907 }
 908
 909 static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
 910 {
 911         struct expansion_card *ec = ECARD_DEV(dev);
 912         return sprintf(buf, "%s\n", ec->type == ECARD_EASI ? "EASI" : "IOC");
 913 }
 914
 915 static struct device_attribute ecard_dev_attrs[] = {
 916         __ATTR(device,   S_IRUGO, ecard_show_device,    NULL),
 917         __ATTR(dma,      S_IRUGO, ecard_show_dma,       NULL),
 918         __ATTR(irq,      S_IRUGO, ecard_show_irq,       NULL),
 919         __ATTR(resource, S_IRUGO, ecard_show_resources, NULL),
 920         __ATTR(type,     S_IRUGO, ecard_show_type,      NULL),
 921         __ATTR(vendor,   S_IRUGO, ecard_show_vendor,    NULL),
 922         __ATTR_NULL,
 923 };
 924
 925
 926 int ecard_request_resources(struct expansion_card *ec)
 927 {
 928         int i, err = 0;
 929
 930         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 931                 if (ecard_resource_end(ec, i) &&
 932                     !request_mem_region(ecard_resource_start(ec, i),
 933                                         ecard_resource_len(ec, i),
 934                                         ec->dev.driver->name)) {
 935                         err = -EBUSY;
 936                         break;
 937                 }
 938         }
 939
 940         if (err) {
 941                 while (i--)
 942                         if (ecard_resource_end(ec, i))
 943                                 release_mem_region(ecard_resource_start(ec, i),
 944                                                    ecard_resource_len(ec, i));
 945         }
 946         return err;
 947 }
 948 EXPORT_SYMBOL(ecard_request_resources);
 949
 950 void ecard_release_resources(struct expansion_card *ec)
 951 {
 952         int i;
 953
 954         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 955                 if (ecard_resource_end(ec, i))
 956                         release_mem_region(ecard_resource_start(ec, i),
 957                                            ecard_resource_len(ec, i));
 958 }
 959 EXPORT_SYMBOL(ecard_release_resources);
 960
 961 /*
 962  * Probe for an expansion card.
 963  *
 964  * If bit 1 of the first byte of the card is set, then the
 965  * card does not exist.
 966  */
 967 static int __init
 968 ecard_probe(int slot, card_type_t type)
 969 {
 970         ecard_t **ecp;
 971         ecard_t *ec;
 972         struct ex_ecid cid;
 973         int i, rc;
 974
 975         ec = ecard_alloc_card(type, slot);
 976         if (IS_ERR(ec)) {
 977                 rc = PTR_ERR(ec);
 978                 goto nomem;
 979         }
 980
 981         rc = -ENODEV;
 982         if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
 983                 goto nodev;
 984
 985         cid.r_zero = 1;
 986         ecard_readbytes(&cid, ec, 0, 16, 0);
 987         if (cid.r_zero)
 988                 goto nodev;
 989
 990         ec->cid.id      = cid.r_id;
 991         ec->cid.cd      = cid.r_cd;
 992         ec->cid.is      = cid.r_is;
 993         ec->cid.w       = cid.r_w;
 994         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
 995         ec->cid.product = ecard_getu16(cid.r_prod);
 996         ec->cid.country = cid.r_country;
 997         ec->cid.irqmask = cid.r_irqmask;
 998         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
 999         ec->cid.fiqmask = cid.r_fiqmask;
1000         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
1001         ec->fiqaddr     =
1002         ec->irqaddr     = (void __iomem *)ioaddr(ec->podaddr);
1003
1004         if (ec->cid.is) {
1005                 ec->irqmask = ec->cid.irqmask;
1006                 ec->irqaddr += ec->cid.irqoff;
1007                 ec->fiqmask = ec->cid.fiqmask;
1008                 ec->fiqaddr += ec->cid.fiqoff;
1009         } else {
1010                 ec->irqmask = 1;
1011                 ec->fiqmask = 4;
1012         }
1013
1014         for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++)
1015                 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
1016                     blacklist[i].product == ec->cid.product) {
1017                         ec->card_desc = blacklist[i].type;
1018                         break;
1019                 }
1020
1021         /*
1022          * hook the interrupt handlers
1023          */
1024         if (slot < 8) {
1025                 ec->irq = 32 + slot;
1026                 set_irq_chip(ec->irq, &ecard_chip);
1027                 set_irq_handler(ec->irq, do_level_IRQ);
1028                 set_irq_flags(ec->irq, IRQF_VALID);
1029         }
1030
1031 #ifdef IO_EC_MEMC8_BASE
1032         if (slot == 8)
1033                 ec->irq = 11;
1034 #endif
1035 #ifdef CONFIG_ARCH_RPC
1036         /* On RiscPC, only first two slots have DMA capability */
1037         if (slot < 2)
1038                 ec->dma = 2 + slot;
1039 #endif
1040
1041         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
1042
1043         *ecp = ec;
1044         slot_to_expcard[slot] = ec;
1045
1046         device_register(&ec->dev);
1047
1048         return 0;
1049
1050  nodev:
1051         ecard_free_card(ec);
1052  nomem:
1053         return rc;
1054 }
1055
1056 /*
1057  * Initialise the expansion card system.
1058  * Locate all hardware - interrupt management and
1059  * actual cards.
1060  */
1061 static int __init ecard_init(void)
1062 {
1063         int slot, irqhw, ret;
1064
1065         ret = kernel_thread(ecard_task, NULL, CLONE_KERNEL);
1066         if (ret < 0) {
1067                 printk(KERN_ERR "Ecard: unable to create kernel thread: %d\n",
1068                        ret);
1069                 return ret;
1070         }
1071
1072         printk("Probing expansion cards\n");
1073
1074         for (slot = 0; slot < 8; slot ++) {
1075                 if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
1076                         ecard_probe(slot, ECARD_IOC);
1077         }
1078
1079 #ifdef IO_EC_MEMC8_BASE
1080         ecard_probe(8, ECARD_IOC);
1081 #endif
1082
1083         irqhw = ecard_probeirqhw();
1084
1085         set_irq_chained_handler(IRQ_EXPANSIONCARD,
1086                                 irqhw ? ecard_irqexp_handler : ecard_irq_handler);
1087
1088         ecard_proc_init();
1089
1090         return 0;
1091 }
1092
1093 subsys_initcall(ecard_init);
1094
1095 /*
1096  *      ECARD "bus"
1097  */
1098 static const struct ecard_id *
1099 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1100 {
1101         int i;
1102
1103         for (i = 0; ids[i].manufacturer != 65535; i++)
1104                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1105                     ec->cid.product == ids[i].product)
1106                         return ids + i;
1107
1108         return NULL;
1109 }
1110
1111 static int ecard_drv_probe(struct device *dev)
1112 {
1113         struct expansion_card *ec = ECARD_DEV(dev);
1114         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1115         const struct ecard_id *id;
1116         int ret;
1117
1118         id = ecard_match_device(drv->id_table, ec);
1119
1120         ecard_claim(ec);
1121         ret = drv->probe(ec, id);
1122         if (ret)
1123                 ecard_release(ec);
1124         return ret;
1125 }
1126
1127 static int ecard_drv_remove(struct device *dev)
1128 {
1129         struct expansion_card *ec = ECARD_DEV(dev);
1130         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1131
1132         drv->remove(ec);
1133         ecard_release(ec);
1134
1135         return 0;
1136 }
1137
1138 /*
1139  * Before rebooting, we must make sure that the expansion card is in a
1140  * sensible state, so it can be re-detected.  This means that the first
1141  * page of the ROM must be visible.  We call the expansion cards reset
1142  * handler, if any.
1143  */
1144 static void ecard_drv_shutdown(struct device *dev)
1145 {
1146         struct expansion_card *ec = ECARD_DEV(dev);
1147         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1148         struct ecard_request req;
1149
1150         if (drv->shutdown)
1151                 drv->shutdown(ec);
1152         ecard_release(ec);
1153
1154         /*
1155          * If this card has a loader, call the reset handler.
1156          */
1157         if (ec->loader) {
1158                 req.fn = ecard_task_reset;
1159                 req.ec = ec;
1160                 ecard_call(&req);
1161         }
1162 }
1163
1164 int ecard_register_driver(struct ecard_driver *drv)
1165 {
1166         drv->drv.bus = &ecard_bus_type;
1167         drv->drv.probe = ecard_drv_probe;
1168         drv->drv.remove = ecard_drv_remove;
1169         drv->drv.shutdown = ecard_drv_shutdown;
1170
1171         return driver_register(&drv->drv);
1172 }
1173
1174 void ecard_remove_driver(struct ecard_driver *drv)
1175 {
1176         driver_unregister(&drv->drv);
1177 }
1178
1179 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1180 {
1181         struct expansion_card *ec = ECARD_DEV(_dev);
1182         struct ecard_driver *drv = ECARD_DRV(_drv);
1183         int ret;
1184
1185         if (drv->id_table) {
1186                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1187         } else {
1188                 ret = ec->cid.id == drv->id;
1189         }
1190
1191         return ret;
1192 }
1193
1194 struct bus_type ecard_bus_type = {
1195         .name           = "ecard",
1196         .dev_attrs      = ecard_dev_attrs,
1197         .match          = ecard_match,
1198 };
1199
1200 static int ecard_bus_init(void)
1201 {
1202         return bus_register(&ecard_bus_type);
1203 }
1204
1205 postcore_initcall(ecard_bus_init);
1206
1207 EXPORT_SYMBOL(ecard_readchunk);
1208 EXPORT_SYMBOL(__ecard_address);
1209 EXPORT_SYMBOL(ecard_register_driver);
1210 EXPORT_SYMBOL(ecard_remove_driver);
1211 EXPORT_SYMBOL(ecard_bus_type);