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
 507 ecard_dump_irq_state(ecard_t *ec)
 508 {
 509         printk("  %d: %sclaimed, ",
 510                ec->slot_no,
 511                ec->claimed ? "" : "not ");
 512
 513         if (ec->ops && ec->ops->irqpending &&
 514             ec->ops != &ecard_default_ops)
 515                 printk("irq %spending\n",
 516                        ec->ops->irqpending(ec) ? "" : "not ");
 517         else
 518                 printk("irqaddr %p, mask = %02X, status = %02X\n",
 519                        ec->irqaddr, ec->irqmask, *ec->irqaddr);
 520 }
 521
 522 static void ecard_check_lockup(struct irqdesc *desc)
 523 {
 524         static unsigned long last;
 525         static int lockup;
 526         ecard_t *ec;
 527
 528         /*
 529          * If the timer interrupt has not run since the last million
 530          * unrecognised expansion card interrupts, then there is
 531          * something seriously wrong.  Disable the expansion card
 532          * interrupts so at least we can continue.
 533          *
 534          * Maybe we ought to start a timer to re-enable them some time
 535          * later?
 536          */
 537         if (last == jiffies) {
 538                 lockup += 1;
 539                 if (lockup > 1000000) {
 540                         printk(KERN_ERR "\nInterrupt lockup detected - "
 541                                "disabling all expansion card interrupts\n");
 542
 543                         desc->chip->mask(IRQ_EXPANSIONCARD);
 544
 545                         printk("Expansion card IRQ state:\n");
 546
 547                         for (ec = cards; ec; ec = ec->next)
 548                                 ecard_dump_irq_state(ec);
 549                 }
 550         } else
 551                 lockup = 0;
 552
 553         /*
 554          * If we did not recognise the source of this interrupt,
 555          * warn the user, but don't flood the user with these messages.
 556          */
 557         if (!last || time_after(jiffies, last + 5*HZ)) {
 558                 last = jiffies;
 559                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 560         }
 561 }
 562
 563 static void
 564 ecard_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 565 {
 566         ecard_t *ec;
 567         int called = 0;
 568
 569         desc->chip->mask(irq);
 570         for (ec = cards; ec; ec = ec->next) {
 571                 int pending;
 572
 573                 if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
 574                         continue;
 575
 576                 if (ec->ops && ec->ops->irqpending)
 577                         pending = ec->ops->irqpending(ec);
 578                 else
 579                         pending = ecard_default_ops.irqpending(ec);
 580
 581                 if (pending) {
 582                         struct irqdesc *d = irq_desc + ec->irq;
 583                         d->handle(ec->irq, d, regs);
 584                         called ++;
 585                 }
 586         }
 587         desc->chip->unmask(irq);
 588
 589         if (called == 0)
 590                 ecard_check_lockup(desc);
 591 }
 592
 593 #ifdef HAS_EXPMASK
 594 static unsigned char priority_masks[] =
 595 {
 596         0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
 597 };
 598
 599 static unsigned char first_set[] =
 600 {
 601         0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
 602         0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
 603 };
 604
 605 static void
 606 ecard_irqexp_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 607 {
 608         const unsigned int statusmask = 15;
 609         unsigned int status;
 610
 611         status = __raw_readb(EXPMASK_STATUS) & statusmask;
 612         if (status) {
 613                 unsigned int slot = first_set[status];
 614                 ecard_t *ec = slot_to_ecard(slot);
 615
 616                 if (ec->claimed) {
 617                         struct irqdesc *d = irqdesc + ec->irq;
 618                         /*
 619                          * this ugly code is so that we can operate a
 620                          * prioritorising system:
 621                          *
 622                          * Card 0       highest priority
 623                          * Card 1
 624                          * Card 2
 625                          * Card 3       lowest priority
 626                          *
 627                          * Serial cards should go in 0/1, ethernet/scsi in 2/3
 628                          * otherwise you will lose serial data at high speeds!
 629                          */
 630                         d->handle(ec->irq, d, regs);
 631                 } else {
 632                         printk(KERN_WARNING "card%d: interrupt from unclaimed "
 633                                "card???\n", slot);
 634                         have_expmask &= ~(1 << slot);
 635                         __raw_writeb(have_expmask, EXPMASK_ENABLE);
 636                 }
 637         } else
 638                 printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
 639 }
 640
 641 static int __init ecard_probeirqhw(void)
 642 {
 643         ecard_t *ec;
 644         int found;
 645
 646         __raw_writeb(0x00, EXPMASK_ENABLE);
 647         __raw_writeb(0xff, EXPMASK_STATUS);
 648         found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
 649         __raw_writeb(0xff, EXPMASK_ENABLE);
 650
 651         if (found) {
 652                 printk(KERN_DEBUG "Expansion card interrupt "
 653                        "management hardware found\n");
 654
 655                 /* for each card present, set a bit to '1' */
 656                 have_expmask = 0x80000000;
 657
 658                 for (ec = cards; ec; ec = ec->next)
 659                         have_expmask |= 1 << ec->slot_no;
 660
 661                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 662         }
 663
 664         return found;
 665 }
 666 #else
 667 #define ecard_irqexp_handler NULL
 668 #define ecard_probeirqhw() (0)
 669 #endif
 670
 671 #ifndef IO_EC_MEMC8_BASE
 672 #define IO_EC_MEMC8_BASE 0
 673 #endif
 674
 675 unsigned int ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 676 {
 677         unsigned long address = 0;
 678         int slot = ec->slot_no;
 679
 680         if (ec->slot_no == 8)
 681                 return IO_EC_MEMC8_BASE;
 682
 683         ectcr &= ~(1 << slot);
 684
 685         switch (type) {
 686         case ECARD_MEMC:
 687                 if (slot < 4)
 688                         address = IO_EC_MEMC_BASE + (slot << 12);
 689                 break;
 690
 691         case ECARD_IOC:
 692                 if (slot < 4)
 693                         address = IO_EC_IOC_BASE + (slot << 12);
 694 #ifdef IO_EC_IOC4_BASE
 695                 else
 696                         address = IO_EC_IOC4_BASE + ((slot - 4) << 12);
 697 #endif
 698                 if (address)
 699                         address +=  speed << 17;
 700                 break;
 701
 702 #ifdef IO_EC_EASI_BASE
 703         case ECARD_EASI:
 704                 address = IO_EC_EASI_BASE + (slot << 22);
 705                 if (speed == ECARD_FAST)
 706                         ectcr |= 1 << slot;
 707                 break;
 708 #endif
 709         default:
 710                 break;
 711         }
 712
 713 #ifdef IOMD_ECTCR
 714         iomd_writeb(ectcr, IOMD_ECTCR);
 715 #endif
 716         return address;
 717 }
 718
 719 static int ecard_prints(char *buffer, ecard_t *ec)
 720 {
 721         char *start = buffer;
 722
 723         buffer += sprintf(buffer, "  %d: %s ", ec->slot_no,
 724                           ec->type == ECARD_EASI ? "EASI" : "    ");
 725
 726         if (ec->cid.id == 0) {
 727                 struct in_chunk_dir incd;
 728
 729                 buffer += sprintf(buffer, "[%04X:%04X] ",
 730                         ec->cid.manufacturer, ec->cid.product);
 731
 732                 if (!ec->card_desc && ec->cid.cd &&
 733                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 734                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 735
 736                         if (ec->card_desc)
 737                                 strcpy((char *)ec->card_desc, incd.d.string);
 738                 }
 739
 740                 buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 741         } else
 742                 buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);
 743
 744         return buffer - start;
 745 }
 746
 747 static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
 748 {
 749         ecard_t *ec = cards;
 750         off_t at = 0;
 751         int len, cnt;
 752
 753         cnt = 0;
 754         while (ec && count > cnt) {
 755                 len = ecard_prints(buf, ec);
 756                 at += len;
 757                 if (at >= pos) {
 758                         if (!*start) {
 759                                 *start = buf + (pos - (at - len));
 760                                 cnt = at - pos;
 761                         } else
 762                                 cnt += len;
 763                         buf += len;
 764                 }
 765                 ec = ec->next;
 766         }
 767         return (count > cnt) ? cnt : count;
 768 }
 769
 770 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 771
 772 static void ecard_proc_init(void)
 773 {
 774         proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
 775         create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
 776                 get_ecard_dev_info);
 777 }
 778
 779 #define ec_set_resource(ec,nr,st,sz,flg)                        \
 780         do {                                                    \
 781                 (ec)->resource[nr].name = ec->dev.bus_id;       \
 782                 (ec)->resource[nr].start = st;                  \
 783                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 784                 (ec)->resource[nr].flags = flg;                 \
 785         } while (0)
 786
 787 static void __init ecard_init_resources(struct expansion_card *ec)
 788 {
 789         unsigned long base = PODSLOT_IOC4_BASE;
 790         unsigned int slot = ec->slot_no;
 791         int i;
 792
 793         if (slot < 4) {
 794                 ec_set_resource(ec, ECARD_RES_MEMC,
 795                                 PODSLOT_MEMC_BASE + (slot << 14),
 796                                 PODSLOT_MEMC_SIZE, IORESOURCE_MEM);
 797                 base = PODSLOT_IOC0_BASE;
 798         }
 799
 800 #ifdef CONFIG_ARCH_RPC
 801         if (slot < 8) {
 802                 ec_set_resource(ec, ECARD_RES_EASI,
 803                                 PODSLOT_EASI_BASE + (slot << 24),
 804                                 PODSLOT_EASI_SIZE, IORESOURCE_MEM);
 805         }
 806
 807         if (slot == 8) {
 808                 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE,
 809                                 NETSLOT_SIZE, IORESOURCE_MEM);
 810         } else
 811 #endif
 812
 813         for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++) {
 814                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 815                                 base + (slot << 14) + (i << 19),
 816                                 PODSLOT_IOC_SIZE, IORESOURCE_MEM);
 817         }
 818
 819         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 820                 if (ec->resource[i].start &&
 821                     request_resource(&iomem_resource, &ec->resource[i])) {
 822                         printk(KERN_ERR "%s: resource(s) not available\n",
 823                                 ec->dev.bus_id);
 824                         ec->resource[i].end -= ec->resource[i].start;
 825                         ec->resource[i].start = 0;
 826                 }
 827         }
 828 }
 829
 830 static ssize_t ecard_show_irq(struct device *dev, char *buf)
 831 {
 832         struct expansion_card *ec = ECARD_DEV(dev);
 833         return sprintf(buf, "%u\n", ec->irq);
 834 }
 835
 836 static DEVICE_ATTR(irq, S_IRUGO, ecard_show_irq, NULL);
 837
 838 static ssize_t ecard_show_dma(struct device *dev, char *buf)
 839 {
 840         struct expansion_card *ec = ECARD_DEV(dev);
 841         return sprintf(buf, "%u\n", ec->dma);
 842 }
 843
 844 static DEVICE_ATTR(dma, S_IRUGO, ecard_show_dma, NULL);
 845
 846 static ssize_t ecard_show_resources(struct device *dev, char *buf)
 847 {
 848         struct expansion_card *ec = ECARD_DEV(dev);
 849         char *str = buf;
 850         int i;
 851
 852         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 853                 str += sprintf(str, "%08lx %08lx %08lx\n",
 854                                 ec->resource[i].start,
 855                                 ec->resource[i].end,
 856                                 ec->resource[i].flags);
 857
 858         return str - buf;
 859 }
 860
 861 static DEVICE_ATTR(resource, S_IRUGO, ecard_show_resources, NULL);
 862
 863 static ssize_t ecard_show_vendor(struct device *dev, char *buf)
 864 {
 865         struct expansion_card *ec = ECARD_DEV(dev);
 866         return sprintf(buf, "%u\n", ec->cid.manufacturer);
 867 }
 868
 869 static DEVICE_ATTR(vendor, S_IRUGO, ecard_show_vendor, NULL);
 870
 871 static ssize_t ecard_show_device(struct device *dev, char *buf)
 872 {
 873         struct expansion_card *ec = ECARD_DEV(dev);
 874         return sprintf(buf, "%u\n", ec->cid.product);
 875 }
 876
 877 static DEVICE_ATTR(device, S_IRUGO, ecard_show_device, NULL);
 878
 879
 880 int ecard_request_resources(struct expansion_card *ec)
 881 {
 882         int i, err = 0;
 883
 884         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 885                 if (ecard_resource_end(ec, i) &&
 886                     !request_mem_region(ecard_resource_start(ec, i),
 887                                         ecard_resource_len(ec, i),
 888                                         ec->dev.driver->name)) {
 889                         err = -EBUSY;
 890                         break;
 891                 }
 892         }
 893
 894         if (err) {
 895                 while (i--)
 896                         if (ecard_resource_end(ec, i))
 897                                 release_mem_region(ecard_resource_start(ec, i),
 898                                                    ecard_resource_len(ec, i));
 899         }
 900         return err;
 901 }
 902 EXPORT_SYMBOL(ecard_request_resources);
 903
 904 void ecard_release_resources(struct expansion_card *ec)
 905 {
 906         int i;
 907
 908         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 909                 if (ecard_resource_end(ec, i))
 910                         release_mem_region(ecard_resource_start(ec, i),
 911                                            ecard_resource_len(ec, i));
 912 }
 913 EXPORT_SYMBOL(ecard_release_resources);
 914
 915 /*
 916  * Probe for an expansion card.
 917  *
 918  * If bit 1 of the first byte of the card is set, then the
 919  * card does not exist.
 920  */
 921 static int __init
 922 ecard_probe(int slot, card_type_t type)
 923 {
 924         ecard_t **ecp;
 925         ecard_t *ec;
 926         struct ex_ecid cid;
 927         int i, rc = -ENOMEM;
 928
 929         ec = kmalloc(sizeof(ecard_t), GFP_KERNEL);
 930         if (!ec)
 931                 goto nomem;
 932
 933         memset(ec, 0, sizeof(ecard_t));
 934
 935         ec->slot_no     = slot;
 936         ec->type        = type;
 937         ec->irq         = NO_IRQ;
 938         ec->fiq         = NO_IRQ;
 939         ec->dma         = NO_DMA;
 940         ec->card_desc   = NULL;
 941         ec->ops         = &ecard_default_ops;
 942
 943         rc = -ENODEV;
 944         if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
 945                 goto nodev;
 946
 947         cid.r_zero = 1;
 948         ecard_readbytes(&cid, ec, 0, 16, 0);
 949         if (cid.r_zero)
 950                 goto nodev;
 951
 952         ec->cid.id      = cid.r_id;
 953         ec->cid.cd      = cid.r_cd;
 954         ec->cid.is      = cid.r_is;
 955         ec->cid.w       = cid.r_w;
 956         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
 957         ec->cid.product = ecard_getu16(cid.r_prod);
 958         ec->cid.country = cid.r_country;
 959         ec->cid.irqmask = cid.r_irqmask;
 960         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
 961         ec->cid.fiqmask = cid.r_fiqmask;
 962         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
 963         ec->fiqaddr     =
 964         ec->irqaddr     = (unsigned char *)ioaddr(ec->podaddr);
 965
 966         if (ec->cid.is) {
 967                 ec->irqmask = ec->cid.irqmask;
 968                 ec->irqaddr += ec->cid.irqoff;
 969                 ec->fiqmask = ec->cid.fiqmask;
 970                 ec->fiqaddr += ec->cid.fiqoff;
 971         } else {
 972                 ec->irqmask = 1;
 973                 ec->fiqmask = 4;
 974         }
 975
 976         for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++)
 977                 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
 978                     blacklist[i].product == ec->cid.product) {
 979                         ec->card_desc = blacklist[i].type;
 980                         break;
 981                 }
 982
 983         snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
 984         ec->dev.parent = NULL;
 985         ec->dev.bus    = &ecard_bus_type;
 986         ec->dev.dma_mask = &ec->dma_mask;
 987         ec->dma_mask = (u64)0xffffffff;
 988
 989         ecard_init_resources(ec);
 990
 991         /*
 992          * hook the interrupt handlers
 993          */
 994         if (slot < 8) {
 995                 ec->irq = 32 + slot;
 996                 set_irq_chip(ec->irq, &ecard_chip);
 997                 set_irq_handler(ec->irq, do_level_IRQ);
 998                 set_irq_flags(ec->irq, IRQF_VALID);
 999         }
1000
1001 #ifdef IO_EC_MEMC8_BASE
1002         if (slot == 8)
1003                 ec->irq = 11;
1004 #endif
1005 #ifdef CONFIG_ARCH_RPC
1006         /* On RiscPC, only first two slots have DMA capability */
1007         if (slot < 2)
1008                 ec->dma = 2 + slot;
1009 #endif
1010
1011         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
1012
1013         *ecp = ec;
1014         slot_to_expcard[slot] = ec;
1015
1016         device_register(&ec->dev);
1017         device_create_file(&ec->dev, &dev_attr_dma);
1018         device_create_file(&ec->dev, &dev_attr_irq);
1019         device_create_file(&ec->dev, &dev_attr_resource);
1020         device_create_file(&ec->dev, &dev_attr_vendor);
1021         device_create_file(&ec->dev, &dev_attr_device);
1022
1023         return 0;
1024
1025 nodev:
1026         kfree(ec);
1027 nomem:
1028         return rc;
1029 }
1030
1031 /*
1032  * Initialise the expansion card system.
1033  * Locate all hardware - interrupt management and
1034  * actual cards.
1035  */
1036 static int __init ecard_init(void)
1037 {
1038         int slot, irqhw, ret;
1039
1040         ret = kernel_thread(ecard_task, NULL, CLONE_KERNEL);
1041         if (ret < 0) {
1042                 printk(KERN_ERR "Ecard: unable to create kernel thread: %d\n",
1043                        ret);
1044                 return ret;
1045         }
1046
1047         printk("Probing expansion cards\n");
1048
1049         for (slot = 0; slot < 8; slot ++) {
1050                 if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
1051                         ecard_probe(slot, ECARD_IOC);
1052         }
1053
1054 #ifdef IO_EC_MEMC8_BASE
1055         ecard_probe(8, ECARD_IOC);
1056 #endif
1057
1058         irqhw = ecard_probeirqhw();
1059
1060         set_irq_chained_handler(IRQ_EXPANSIONCARD,
1061                                 irqhw ? ecard_irqexp_handler : ecard_irq_handler);
1062
1063         ecard_proc_init();
1064
1065         return 0;
1066 }
1067
1068 subsys_initcall(ecard_init);
1069
1070 /*
1071  *      ECARD "bus"
1072  */
1073 static const struct ecard_id *
1074 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1075 {
1076         int i;
1077
1078         for (i = 0; ids[i].manufacturer != 65535; i++)
1079                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1080                     ec->cid.product == ids[i].product)
1081                         return ids + i;
1082
1083         return NULL;
1084 }
1085
1086 static int ecard_drv_probe(struct device *dev)
1087 {
1088         struct expansion_card *ec = ECARD_DEV(dev);
1089         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1090         const struct ecard_id *id;
1091         int ret;
1092
1093         id = ecard_match_device(drv->id_table, ec);
1094
1095         ecard_claim(ec);
1096         ret = drv->probe(ec, id);
1097         if (ret)
1098                 ecard_release(ec);
1099         return ret;
1100 }
1101
1102 static int ecard_drv_remove(struct device *dev)
1103 {
1104         struct expansion_card *ec = ECARD_DEV(dev);
1105         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1106
1107         drv->remove(ec);
1108         ecard_release(ec);
1109
1110         return 0;
1111 }
1112
1113 /*
1114  * Before rebooting, we must make sure that the expansion card is in a
1115  * sensible state, so it can be re-detected.  This means that the first
1116  * page of the ROM must be visible.  We call the expansion cards reset
1117  * handler, if any.
1118  */
1119 static void ecard_drv_shutdown(struct device *dev)
1120 {
1121         struct expansion_card *ec = ECARD_DEV(dev);
1122         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1123         struct ecard_request req;
1124
1125         if (drv->shutdown)
1126                 drv->shutdown(ec);
1127         ecard_release(ec);
1128         req.fn = ecard_task_reset;
1129         req.ec = ec;
1130         ecard_call(&req);
1131 }
1132
1133 int ecard_register_driver(struct ecard_driver *drv)
1134 {
1135         drv->drv.bus = &ecard_bus_type;
1136         drv->drv.probe = ecard_drv_probe;
1137         drv->drv.remove = ecard_drv_remove;
1138         drv->drv.shutdown = ecard_drv_shutdown;
1139
1140         return driver_register(&drv->drv);
1141 }
1142
1143 void ecard_remove_driver(struct ecard_driver *drv)
1144 {
1145         driver_unregister(&drv->drv);
1146 }
1147
1148 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1149 {
1150         struct expansion_card *ec = ECARD_DEV(_dev);
1151         struct ecard_driver *drv = ECARD_DRV(_drv);
1152         int ret;
1153
1154         if (drv->id_table) {
1155                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1156         } else {
1157                 ret = ec->cid.id == drv->id;
1158         }
1159
1160         return ret;
1161 }
1162
1163 struct bus_type ecard_bus_type = {
1164         .name   = "ecard",
1165         .match  = ecard_match,
1166 };
1167
1168 static int ecard_bus_init(void)
1169 {
1170         return bus_register(&ecard_bus_type);
1171 }
1172
1173 postcore_initcall(ecard_bus_init);
1174
1175 EXPORT_SYMBOL(ecard_readchunk);
1176 EXPORT_SYMBOL(ecard_address);
1177 EXPORT_SYMBOL(ecard_register_driver);
1178 EXPORT_SYMBOL(ecard_remove_driver);
1179 EXPORT_SYMBOL(ecard_bus_type);