arch/arm/mach-rpc/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/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/types.h>
  33 #include <linux/sched.h>
  34 #include <linux/sched/mm.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/seq_file.h>
  42 #include <linux/device.h>
  43 #include <linux/init.h>
  44 #include <linux/mutex.h>
  45 #include <linux/kthread.h>
  46 #include <linux/irq.h>
  47 #include <linux/io.h>
  48
  49 #include <asm/dma.h>
  50 #include <asm/ecard.h>
  51 #include <mach/hardware.h>
  52 #include <asm/irq.h>
  53 #include <asm/mmu_context.h>
  54 #include <asm/mach/irq.h>
  55 #include <asm/tlbflush.h>
  56
  57 #include "ecard.h"
  58
  59 struct ecard_request {
  60         void            (*fn)(struct ecard_request *);
  61         ecard_t         *ec;
  62         unsigned int    address;
  63         unsigned int    length;
  64         unsigned int    use_loader;
  65         void            *buffer;
  66         struct completion *complete;
  67 };
  68
  69 struct expcard_blacklist {
  70         unsigned short   manufacturer;
  71         unsigned short   product;
  72         const char      *type;
  73 };
  74
  75 static ecard_t *cards;
  76 static ecard_t *slot_to_expcard[MAX_ECARDS];
  77 static unsigned int ectcr;
  78
  79 /* List of descriptions of cards which don't have an extended
  80  * identification, or chunk directories containing a description.
  81  */
  82 static struct expcard_blacklist __initdata blacklist[] = {
  83         { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
  84 };
  85
  86 asmlinkage extern int
  87 ecard_loader_reset(unsigned long base, loader_t loader);
  88 asmlinkage extern int
  89 ecard_loader_read(int off, unsigned long base, loader_t loader);
  90
  91 static inline unsigned short ecard_getu16(unsigned char *v)
  92 {
  93         return v[0] | v[1] << 8;
  94 }
  95
  96 static inline signed long ecard_gets24(unsigned char *v)
  97 {
  98         return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
  99 }
 100
 101 static inline ecard_t *slot_to_ecard(unsigned int slot)
 102 {
 103         return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
 104 }
 105
 106 /* ===================== Expansion card daemon ======================== */
 107 /*
 108  * Since the loader programs on the expansion cards need to be run
 109  * in a specific environment, create a separate task with this
 110  * environment up, and pass requests to this task as and when we
 111  * need to.
 112  *
 113  * This should allow 99% of loaders to be called from Linux.
 114  *
 115  * From a security standpoint, we trust the card vendors.  This
 116  * may be a misplaced trust.
 117  */
 118 static void ecard_task_reset(struct ecard_request *req)
 119 {
 120         struct expansion_card *ec = req->ec;
 121         struct resource *res;
 122
 123         res = ec->slot_no == 8
 124                 ? &ec->resource[ECARD_RES_MEMC]
 125                 : ec->easi
 126                   ? &ec->resource[ECARD_RES_EASI]
 127                   : &ec->resource[ECARD_RES_IOCSYNC];
 128
 129         ecard_loader_reset(res->start, ec->loader);
 130 }
 131
 132 static void ecard_task_readbytes(struct ecard_request *req)
 133 {
 134         struct expansion_card *ec = req->ec;
 135         unsigned char *buf = req->buffer;
 136         unsigned int len = req->length;
 137         unsigned int off = req->address;
 138
 139         if (ec->slot_no == 8) {
 140                 void __iomem *base = (void __iomem *)
 141                                 ec->resource[ECARD_RES_MEMC].start;
 142
 143                 /*
 144                  * The card maintains an index which increments the address
 145                  * into a 4096-byte page on each access.  We need to keep
 146                  * track of the counter.
 147                  */
 148                 static unsigned int index;
 149                 unsigned int page;
 150
 151                 page = (off >> 12) * 4;
 152                 if (page > 256 * 4)
 153                         return;
 154
 155                 off &= 4095;
 156
 157                 /*
 158                  * If we are reading offset 0, or our current index is
 159                  * greater than the offset, reset the hardware index counter.
 160                  */
 161                 if (off == 0 || index > off) {
 162                         writeb(0, base);
 163                         index = 0;
 164                 }
 165
 166                 /*
 167                  * Increment the hardware index counter until we get to the
 168                  * required offset.  The read bytes are discarded.
 169                  */
 170                 while (index < off) {
 171                         readb(base + page);
 172                         index += 1;
 173                 }
 174
 175                 while (len--) {
 176                         *buf++ = readb(base + page);
 177                         index += 1;
 178                 }
 179         } else {
 180                 unsigned long base = (ec->easi
 181                          ? &ec->resource[ECARD_RES_EASI]
 182                          : &ec->resource[ECARD_RES_IOCSYNC])->start;
 183                 void __iomem *pbase = (void __iomem *)base;
 184
 185                 if (!req->use_loader || !ec->loader) {
 186                         off *= 4;
 187                         while (len--) {
 188                                 *buf++ = readb(pbase + off);
 189                                 off += 4;
 190                         }
 191                 } else {
 192                         while(len--) {
 193                                 /*
 194                                  * The following is required by some
 195                                  * expansion card loader programs.
 196                                  */
 197                                 *(unsigned long *)0x108 = 0;
 198                                 *buf++ = ecard_loader_read(off++, base,
 199                                                            ec->loader);
 200                         }
 201                 }
 202         }
 203
 204 }
 205
 206 static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
 207 static struct ecard_request *ecard_req;
 208 static DEFINE_MUTEX(ecard_mutex);
 209
 210 /*
 211  * Set up the expansion card daemon's page tables.
 212  */
 213 static void ecard_init_pgtables(struct mm_struct *mm)
 214 {
 215         struct vm_area_struct vma;
 216
 217         /* We want to set up the page tables for the following mapping:
 218          *  Virtual     Physical
 219          *  0x03000000  0x03000000
 220          *  0x03010000  unmapped
 221          *  0x03210000  0x03210000
 222          *  0x03400000  unmapped
 223          *  0x08000000  0x08000000
 224          *  0x10000000  unmapped
 225          *
 226          * FIXME: we don't follow this 100% yet.
 227          */
 228         pgd_t *src_pgd, *dst_pgd;
 229
 230         src_pgd = pgd_offset(mm, (unsigned long)IO_BASE);
 231         dst_pgd = pgd_offset(mm, IO_START);
 232
 233         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));
 234
 235         src_pgd = pgd_offset(mm, (unsigned long)EASI_BASE);
 236         dst_pgd = pgd_offset(mm, EASI_START);
 237
 238         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));
 239
 240         vma_init(&vma, mm);
 241         vma.vm_flags = VM_EXEC;
 242
 243         flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
 244         flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
 245 }
 246
 247 static int ecard_init_mm(void)
 248 {
 249         struct mm_struct * mm = mm_alloc();
 250         struct mm_struct *active_mm = current->active_mm;
 251
 252         if (!mm)
 253                 return -ENOMEM;
 254
 255         current->mm = mm;
 256         current->active_mm = mm;
 257         activate_mm(active_mm, mm);
 258         mmdrop(active_mm);
 259         ecard_init_pgtables(mm);
 260         return 0;
 261 }
 262
 263 static int
 264 ecard_task(void * unused)
 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_ONSTACK(completion);
 297
 298         req->complete = &completion;
 299
 300         mutex_lock(&ecard_mutex);
 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         mutex_unlock(&ecard_mutex);
 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 = 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 }
 390
 391 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 392 {
 393 }
 394
 395 static int ecard_def_irq_pending(ecard_t *ec)
 396 {
 397         return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
 398 }
 399
 400 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 401 {
 402         panic("ecard_def_fiq_enable called - impossible");
 403 }
 404
 405 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 406 {
 407         panic("ecard_def_fiq_disable called - impossible");
 408 }
 409
 410 static int ecard_def_fiq_pending(ecard_t *ec)
 411 {
 412         return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
 413 }
 414
 415 static expansioncard_ops_t ecard_default_ops = {
 416         ecard_def_irq_enable,
 417         ecard_def_irq_disable,
 418         ecard_def_irq_pending,
 419         ecard_def_fiq_enable,
 420         ecard_def_fiq_disable,
 421         ecard_def_fiq_pending
 422 };
 423
 424 /*
 425  * Enable and disable interrupts from expansion cards.
 426  * (interrupts are disabled for these functions).
 427  *
 428  * They are not meant to be called directly, but via enable/disable_irq.
 429  */
 430 static void ecard_irq_unmask(struct irq_data *d)
 431 {
 432         ecard_t *ec = irq_data_get_irq_chip_data(d);
 433
 434         if (ec) {
 435                 if (!ec->ops)
 436                         ec->ops = &ecard_default_ops;
 437
 438                 if (ec->claimed && ec->ops->irqenable)
 439                         ec->ops->irqenable(ec, d->irq);
 440                 else
 441                         printk(KERN_ERR "ecard: rejecting request to "
 442                                 "enable IRQs for %d\n", d->irq);
 443         }
 444 }
 445
 446 static void ecard_irq_mask(struct irq_data *d)
 447 {
 448         ecard_t *ec = irq_data_get_irq_chip_data(d);
 449
 450         if (ec) {
 451                 if (!ec->ops)
 452                         ec->ops = &ecard_default_ops;
 453
 454                 if (ec->ops && ec->ops->irqdisable)
 455                         ec->ops->irqdisable(ec, d->irq);
 456         }
 457 }
 458
 459 static struct irq_chip ecard_chip = {
 460         .name           = "ECARD",
 461         .irq_ack        = ecard_irq_mask,
 462         .irq_mask       = ecard_irq_mask,
 463         .irq_unmask     = ecard_irq_unmask,
 464 };
 465
 466 void ecard_enablefiq(unsigned int fiqnr)
 467 {
 468         ecard_t *ec = slot_to_ecard(fiqnr);
 469
 470         if (ec) {
 471                 if (!ec->ops)
 472                         ec->ops = &ecard_default_ops;
 473
 474                 if (ec->claimed && ec->ops->fiqenable)
 475                         ec->ops->fiqenable(ec, fiqnr);
 476                 else
 477                         printk(KERN_ERR "ecard: rejecting request to "
 478                                 "enable FIQs for %d\n", fiqnr);
 479         }
 480 }
 481
 482 void ecard_disablefiq(unsigned int fiqnr)
 483 {
 484         ecard_t *ec = slot_to_ecard(fiqnr);
 485
 486         if (ec) {
 487                 if (!ec->ops)
 488                         ec->ops = &ecard_default_ops;
 489
 490                 if (ec->ops->fiqdisable)
 491                         ec->ops->fiqdisable(ec, fiqnr);
 492         }
 493 }
 494
 495 static void ecard_dump_irq_state(void)
 496 {
 497         ecard_t *ec;
 498
 499         printk("Expansion card IRQ state:\n");
 500
 501         for (ec = cards; ec; ec = ec->next) {
 502                 if (ec->slot_no == 8)
 503                         continue;
 504
 505                 printk("  %d: %sclaimed, ",
 506                        ec->slot_no, ec->claimed ? "" : "not ");
 507
 508                 if (ec->ops && ec->ops->irqpending &&
 509                     ec->ops != &ecard_default_ops)
 510                         printk("irq %spending\n",
 511                                ec->ops->irqpending(ec) ? "" : "not ");
 512                 else
 513                         printk("irqaddr %p, mask = %02X, status = %02X\n",
 514                                ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
 515         }
 516 }
 517
 518 static void ecard_check_lockup(struct irq_desc *desc)
 519 {
 520         static unsigned long last;
 521         static int lockup;
 522
 523         /*
 524          * If the timer interrupt has not run since the last million
 525          * unrecognised expansion card interrupts, then there is
 526          * something seriously wrong.  Disable the expansion card
 527          * interrupts so at least we can continue.
 528          *
 529          * Maybe we ought to start a timer to re-enable them some time
 530          * later?
 531          */
 532         if (last == jiffies) {
 533                 lockup += 1;
 534                 if (lockup > 1000000) {
 535                         printk(KERN_ERR "\nInterrupt lockup detected - "
 536                                "disabling all expansion card interrupts\n");
 537
 538                         desc->irq_data.chip->irq_mask(&desc->irq_data);
 539                         ecard_dump_irq_state();
 540                 }
 541         } else
 542                 lockup = 0;
 543
 544         /*
 545          * If we did not recognise the source of this interrupt,
 546          * warn the user, but don't flood the user with these messages.
 547          */
 548         if (!last || time_after(jiffies, last + 5*HZ)) {
 549                 last = jiffies;
 550                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 551                 ecard_dump_irq_state();
 552         }
 553 }
 554
 555 static void ecard_irq_handler(struct irq_desc *desc)
 556 {
 557         ecard_t *ec;
 558         int called = 0;
 559
 560         desc->irq_data.chip->irq_mask(&desc->irq_data);
 561         for (ec = cards; ec; ec = ec->next) {
 562                 int pending;
 563
 564                 if (!ec->claimed || !ec->irq || ec->slot_no == 8)
 565                         continue;
 566
 567                 if (ec->ops && ec->ops->irqpending)
 568                         pending = ec->ops->irqpending(ec);
 569                 else
 570                         pending = ecard_default_ops.irqpending(ec);
 571
 572                 if (pending) {
 573                         generic_handle_irq(ec->irq);
 574                         called ++;
 575                 }
 576         }
 577         desc->irq_data.chip->irq_unmask(&desc->irq_data);
 578
 579         if (called == 0)
 580                 ecard_check_lockup(desc);
 581 }
 582
 583 static void __iomem *__ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 584 {
 585         void __iomem *address = NULL;
 586         int slot = ec->slot_no;
 587
 588         if (ec->slot_no == 8)
 589                 return ECARD_MEMC8_BASE;
 590
 591         ectcr &= ~(1 << slot);
 592
 593         switch (type) {
 594         case ECARD_MEMC:
 595                 if (slot < 4)
 596                         address = ECARD_MEMC_BASE + (slot << 14);
 597                 break;
 598
 599         case ECARD_IOC:
 600                 if (slot < 4)
 601                         address = ECARD_IOC_BASE + (slot << 14);
 602                 else
 603                         address = ECARD_IOC4_BASE + ((slot - 4) << 14);
 604                 if (address)
 605                         address += speed << 19;
 606                 break;
 607
 608         case ECARD_EASI:
 609                 address = ECARD_EASI_BASE + (slot << 24);
 610                 if (speed == ECARD_FAST)
 611                         ectcr |= 1 << slot;
 612                 break;
 613
 614         default:
 615                 break;
 616         }
 617
 618 #ifdef IOMD_ECTCR
 619         iomd_writeb(ectcr, IOMD_ECTCR);
 620 #endif
 621         return address;
 622 }
 623
 624 static int ecard_prints(struct seq_file *m, ecard_t *ec)
 625 {
 626         seq_printf(m, "  %d: %s ", ec->slot_no, ec->easi ? "EASI" : "    ");
 627
 628         if (ec->cid.id == 0) {
 629                 struct in_chunk_dir incd;
 630
 631                 seq_printf(m, "[%04X:%04X] ",
 632                         ec->cid.manufacturer, ec->cid.product);
 633
 634                 if (!ec->card_desc && ec->cid.cd &&
 635                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 636                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 637
 638                         if (ec->card_desc)
 639                                 strcpy((char *)ec->card_desc, incd.d.string);
 640                 }
 641
 642                 seq_printf(m, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 643         } else
 644                 seq_printf(m, "Simple card %d\n", ec->cid.id);
 645
 646         return 0;
 647 }
 648
 649 static int ecard_devices_proc_show(struct seq_file *m, void *v)
 650 {
 651         ecard_t *ec = cards;
 652
 653         while (ec) {
 654                 ecard_prints(m, ec);
 655                 ec = ec->next;
 656         }
 657         return 0;
 658 }
 659
 660 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 661
 662 static void ecard_proc_init(void)
 663 {
 664         proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL);
 665         proc_create_single("devices", 0, proc_bus_ecard_dir,
 666                         ecard_devices_proc_show);
 667 }
 668
 669 #define ec_set_resource(ec,nr,st,sz)                            \
 670         do {                                                    \
 671                 (ec)->resource[nr].name = dev_name(&ec->dev);   \
 672                 (ec)->resource[nr].start = st;                  \
 673                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 674                 (ec)->resource[nr].flags = IORESOURCE_MEM;      \
 675         } while (0)
 676
 677 static void __init ecard_free_card(struct expansion_card *ec)
 678 {
 679         int i;
 680
 681         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 682                 if (ec->resource[i].flags)
 683                         release_resource(&ec->resource[i]);
 684
 685         kfree(ec);
 686 }
 687
 688 static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 689 {
 690         struct expansion_card *ec;
 691         unsigned long base;
 692         int i;
 693
 694         ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
 695         if (!ec) {
 696                 ec = ERR_PTR(-ENOMEM);
 697                 goto nomem;
 698         }
 699
 700         ec->slot_no = slot;
 701         ec->easi = type == ECARD_EASI;
 702         ec->irq = 0;
 703         ec->fiq = 0;
 704         ec->dma = NO_DMA;
 705         ec->ops = &ecard_default_ops;
 706
 707         dev_set_name(&ec->dev, "ecard%d", slot);
 708         ec->dev.parent = NULL;
 709         ec->dev.bus = &ecard_bus_type;
 710         ec->dev.dma_mask = &ec->dma_mask;
 711         ec->dma_mask = (u64)0xffffffff;
 712         ec->dev.coherent_dma_mask = ec->dma_mask;
 713
 714         if (slot < 4) {
 715                 ec_set_resource(ec, ECARD_RES_MEMC,
 716                                 PODSLOT_MEMC_BASE + (slot << 14),
 717                                 PODSLOT_MEMC_SIZE);
 718                 base = PODSLOT_IOC0_BASE + (slot << 14);
 719         } else
 720                 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
 721
 722 #ifdef CONFIG_ARCH_RPC
 723         if (slot < 8) {
 724                 ec_set_resource(ec, ECARD_RES_EASI,
 725                                 PODSLOT_EASI_BASE + (slot << 24),
 726                                 PODSLOT_EASI_SIZE);
 727         }
 728
 729         if (slot == 8) {
 730                 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
 731         } else
 732 #endif
 733
 734         for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
 735                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 736                                 base + (i << 19), PODSLOT_IOC_SIZE);
 737
 738         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 739                 if (ec->resource[i].flags &&
 740                     request_resource(&iomem_resource, &ec->resource[i])) {
 741                         dev_err(&ec->dev, "resource(s) not available\n");
 742                         ec->resource[i].end -= ec->resource[i].start;
 743                         ec->resource[i].start = 0;
 744                         ec->resource[i].flags = 0;
 745                 }
 746         }
 747
 748  nomem:
 749         return ec;
 750 }
 751
 752 static ssize_t irq_show(struct device *dev, struct device_attribute *attr, char *buf)
 753 {
 754         struct expansion_card *ec = ECARD_DEV(dev);
 755         return sprintf(buf, "%u\n", ec->irq);
 756 }
 757 static DEVICE_ATTR_RO(irq);
 758
 759 static ssize_t dma_show(struct device *dev, struct device_attribute *attr, char *buf)
 760 {
 761         struct expansion_card *ec = ECARD_DEV(dev);
 762         return sprintf(buf, "%u\n", ec->dma);
 763 }
 764 static DEVICE_ATTR_RO(dma);
 765
 766 static ssize_t resource_show(struct device *dev, struct device_attribute *attr, char *buf)
 767 {
 768         struct expansion_card *ec = ECARD_DEV(dev);
 769         char *str = buf;
 770         int i;
 771
 772         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 773                 str += sprintf(str, "%08x %08x %08lx\n",
 774                                 ec->resource[i].start,
 775                                 ec->resource[i].end,
 776                                 ec->resource[i].flags);
 777
 778         return str - buf;
 779 }
 780 static DEVICE_ATTR_RO(resource);
 781
 782 static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
 783 {
 784         struct expansion_card *ec = ECARD_DEV(dev);
 785         return sprintf(buf, "%u\n", ec->cid.manufacturer);
 786 }
 787 static DEVICE_ATTR_RO(vendor);
 788
 789 static ssize_t device_show(struct device *dev, struct device_attribute *attr, char *buf)
 790 {
 791         struct expansion_card *ec = ECARD_DEV(dev);
 792         return sprintf(buf, "%u\n", ec->cid.product);
 793 }
 794 static DEVICE_ATTR_RO(device);
 795
 796 static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf)
 797 {
 798         struct expansion_card *ec = ECARD_DEV(dev);
 799         return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
 800 }
 801 static DEVICE_ATTR_RO(type);
 802
 803 static struct attribute *ecard_dev_attrs[] = {
 804         &dev_attr_device.attr,
 805         &dev_attr_dma.attr,
 806         &dev_attr_irq.attr,
 807         &dev_attr_resource.attr,
 808         &dev_attr_type.attr,
 809         &dev_attr_vendor.attr,
 810         NULL,
 811 };
 812 ATTRIBUTE_GROUPS(ecard_dev);
 813
 814 int ecard_request_resources(struct expansion_card *ec)
 815 {
 816         int i, err = 0;
 817
 818         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 819                 if (ecard_resource_end(ec, i) &&
 820                     !request_mem_region(ecard_resource_start(ec, i),
 821                                         ecard_resource_len(ec, i),
 822                                         ec->dev.driver->name)) {
 823                         err = -EBUSY;
 824                         break;
 825                 }
 826         }
 827
 828         if (err) {
 829                 while (i--)
 830                         if (ecard_resource_end(ec, i))
 831                                 release_mem_region(ecard_resource_start(ec, i),
 832                                                    ecard_resource_len(ec, i));
 833         }
 834         return err;
 835 }
 836 EXPORT_SYMBOL(ecard_request_resources);
 837
 838 void ecard_release_resources(struct expansion_card *ec)
 839 {
 840         int i;
 841
 842         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 843                 if (ecard_resource_end(ec, i))
 844                         release_mem_region(ecard_resource_start(ec, i),
 845                                            ecard_resource_len(ec, i));
 846 }
 847 EXPORT_SYMBOL(ecard_release_resources);
 848
 849 void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
 850 {
 851         ec->irq_data = irq_data;
 852         barrier();
 853         ec->ops = ops;
 854 }
 855 EXPORT_SYMBOL(ecard_setirq);
 856
 857 void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
 858                            unsigned long offset, unsigned long maxsize)
 859 {
 860         unsigned long start = ecard_resource_start(ec, res);
 861         unsigned long end = ecard_resource_end(ec, res);
 862
 863         if (offset > (end - start))
 864                 return NULL;
 865
 866         start += offset;
 867         if (maxsize && end - start > maxsize)
 868                 end = start + maxsize;
 869
 870         return devm_ioremap(&ec->dev, start, end - start);
 871 }
 872 EXPORT_SYMBOL(ecardm_iomap);
 873
 874 /*
 875  * Probe for an expansion card.
 876  *
 877  * If bit 1 of the first byte of the card is set, then the
 878  * card does not exist.
 879  */
 880 static int __init ecard_probe(int slot, unsigned irq, card_type_t type)
 881 {
 882         ecard_t **ecp;
 883         ecard_t *ec;
 884         struct ex_ecid cid;
 885         void __iomem *addr;
 886         int i, rc;
 887
 888         ec = ecard_alloc_card(type, slot);
 889         if (IS_ERR(ec)) {
 890                 rc = PTR_ERR(ec);
 891                 goto nomem;
 892         }
 893
 894         rc = -ENODEV;
 895         if ((addr = __ecard_address(ec, type, ECARD_SYNC)) == NULL)
 896                 goto nodev;
 897
 898         cid.r_zero = 1;
 899         ecard_readbytes(&cid, ec, 0, 16, 0);
 900         if (cid.r_zero)
 901                 goto nodev;
 902
 903         ec->cid.id      = cid.r_id;
 904         ec->cid.cd      = cid.r_cd;
 905         ec->cid.is      = cid.r_is;
 906         ec->cid.w       = cid.r_w;
 907         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
 908         ec->cid.product = ecard_getu16(cid.r_prod);
 909         ec->cid.country = cid.r_country;
 910         ec->cid.irqmask = cid.r_irqmask;
 911         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
 912         ec->cid.fiqmask = cid.r_fiqmask;
 913         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
 914         ec->fiqaddr     =
 915         ec->irqaddr     = addr;
 916
 917         if (ec->cid.is) {
 918                 ec->irqmask = ec->cid.irqmask;
 919                 ec->irqaddr += ec->cid.irqoff;
 920                 ec->fiqmask = ec->cid.fiqmask;
 921                 ec->fiqaddr += ec->cid.fiqoff;
 922         } else {
 923                 ec->irqmask = 1;
 924                 ec->fiqmask = 4;
 925         }
 926
 927         for (i = 0; i < ARRAY_SIZE(blacklist); i++)
 928                 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
 929                     blacklist[i].product == ec->cid.product) {
 930                         ec->card_desc = blacklist[i].type;
 931                         break;
 932                 }
 933
 934         ec->irq = irq;
 935
 936         /*
 937          * hook the interrupt handlers
 938          */
 939         if (slot < 8) {
 940                 irq_set_chip_and_handler(ec->irq, &ecard_chip,
 941                                          handle_level_irq);
 942                 irq_set_chip_data(ec->irq, ec);
 943                 irq_clear_status_flags(ec->irq, IRQ_NOREQUEST);
 944         }
 945
 946 #ifdef CONFIG_ARCH_RPC
 947         /* On RiscPC, only first two slots have DMA capability */
 948         if (slot < 2)
 949                 ec->dma = 2 + slot;
 950 #endif
 951
 952         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
 953
 954         *ecp = ec;
 955         slot_to_expcard[slot] = ec;
 956
 957         rc = device_register(&ec->dev);
 958         if (rc)
 959                 goto nodev;
 960
 961         return 0;
 962
 963  nodev:
 964         ecard_free_card(ec);
 965  nomem:
 966         return rc;
 967 }
 968
 969 /*
 970  * Initialise the expansion card system.
 971  * Locate all hardware - interrupt management and
 972  * actual cards.
 973  */
 974 static int __init ecard_init(void)
 975 {
 976         struct task_struct *task;
 977         int slot, irqbase;
 978
 979         irqbase = irq_alloc_descs(-1, 0, 8, -1);
 980         if (irqbase < 0)
 981                 return irqbase;
 982
 983         task = kthread_run(ecard_task, NULL, "kecardd");
 984         if (IS_ERR(task)) {
 985                 printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
 986                        PTR_ERR(task));
 987                 irq_free_descs(irqbase, 8);
 988                 return PTR_ERR(task);
 989         }
 990
 991         printk("Probing expansion cards\n");
 992
 993         for (slot = 0; slot < 8; slot ++) {
 994                 if (ecard_probe(slot, irqbase + slot, ECARD_EASI) == -ENODEV)
 995                         ecard_probe(slot, irqbase + slot, ECARD_IOC);
 996         }
 997
 998         ecard_probe(8, 11, ECARD_IOC);
 999
1000         irq_set_chained_handler(IRQ_EXPANSIONCARD, ecard_irq_handler);
1001
1002         ecard_proc_init();
1003
1004         return 0;
1005 }
1006
1007 subsys_initcall(ecard_init);
1008
1009 /*
1010  *      ECARD "bus"
1011  */
1012 static const struct ecard_id *
1013 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1014 {
1015         int i;
1016
1017         for (i = 0; ids[i].manufacturer != 65535; i++)
1018                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1019                     ec->cid.product == ids[i].product)
1020                         return ids + i;
1021
1022         return NULL;
1023 }
1024
1025 static int ecard_drv_probe(struct device *dev)
1026 {
1027         struct expansion_card *ec = ECARD_DEV(dev);
1028         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1029         const struct ecard_id *id;
1030         int ret;
1031
1032         id = ecard_match_device(drv->id_table, ec);
1033
1034         ec->claimed = 1;
1035         ret = drv->probe(ec, id);
1036         if (ret)
1037                 ec->claimed = 0;
1038         return ret;
1039 }
1040
1041 static int ecard_drv_remove(struct device *dev)
1042 {
1043         struct expansion_card *ec = ECARD_DEV(dev);
1044         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1045
1046         drv->remove(ec);
1047         ec->claimed = 0;
1048
1049         /*
1050          * Restore the default operations.  We ensure that the
1051          * ops are set before we change the data.
1052          */
1053         ec->ops = &ecard_default_ops;
1054         barrier();
1055         ec->irq_data = NULL;
1056
1057         return 0;
1058 }
1059
1060 /*
1061  * Before rebooting, we must make sure that the expansion card is in a
1062  * sensible state, so it can be re-detected.  This means that the first
1063  * page of the ROM must be visible.  We call the expansion cards reset
1064  * handler, if any.
1065  */
1066 static void ecard_drv_shutdown(struct device *dev)
1067 {
1068         struct expansion_card *ec = ECARD_DEV(dev);
1069         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1070         struct ecard_request req;
1071
1072         if (dev->driver) {
1073                 if (drv->shutdown)
1074                         drv->shutdown(ec);
1075                 ec->claimed = 0;
1076         }
1077
1078         /*
1079          * If this card has a loader, call the reset handler.
1080          */
1081         if (ec->loader) {
1082                 req.fn = ecard_task_reset;
1083                 req.ec = ec;
1084                 ecard_call(&req);
1085         }
1086 }
1087
1088 int ecard_register_driver(struct ecard_driver *drv)
1089 {
1090         drv->drv.bus = &ecard_bus_type;
1091
1092         return driver_register(&drv->drv);
1093 }
1094
1095 void ecard_remove_driver(struct ecard_driver *drv)
1096 {
1097         driver_unregister(&drv->drv);
1098 }
1099
1100 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1101 {
1102         struct expansion_card *ec = ECARD_DEV(_dev);
1103         struct ecard_driver *drv = ECARD_DRV(_drv);
1104         int ret;
1105
1106         if (drv->id_table) {
1107                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1108         } else {
1109                 ret = ec->cid.id == drv->id;
1110         }
1111
1112         return ret;
1113 }
1114
1115 struct bus_type ecard_bus_type = {
1116         .name           = "ecard",
1117         .dev_groups     = ecard_dev_groups,
1118         .match          = ecard_match,
1119         .probe          = ecard_drv_probe,
1120         .remove         = ecard_drv_remove,
1121         .shutdown       = ecard_drv_shutdown,
1122 };
1123
1124 static int ecard_bus_init(void)
1125 {
1126         return bus_register(&ecard_bus_type);
1127 }
1128
1129 postcore_initcall(ecard_bus_init);
1130
1131 EXPORT_SYMBOL(ecard_readchunk);
1132 EXPORT_SYMBOL(ecard_register_driver);
1133 EXPORT_SYMBOL(ecard_remove_driver);
1134 EXPORT_SYMBOL(ecard_bus_type);