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 = TLB_FLUSH_VMA(mm, VM_EXEC);
 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         flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
 241         flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
 242 }
 243
 244 static int ecard_init_mm(void)
 245 {
 246         struct mm_struct * mm = mm_alloc();
 247         struct mm_struct *active_mm = current->active_mm;
 248
 249         if (!mm)
 250                 return -ENOMEM;
 251
 252         current->mm = mm;
 253         current->active_mm = mm;
 254         activate_mm(active_mm, mm);
 255         mmdrop(active_mm);
 256         ecard_init_pgtables(mm);
 257         return 0;
 258 }
 259
 260 static int
 261 ecard_task(void * unused)
 262 {
 263         /*
 264          * Allocate a mm.  We're not a lazy-TLB kernel task since we need
 265          * to set page table entries where the user space would be.  Note
 266          * that this also creates the page tables.  Failure is not an
 267          * option here.
 268          */
 269         if (ecard_init_mm())
 270                 panic("kecardd: unable to alloc mm\n");
 271
 272         while (1) {
 273                 struct ecard_request *req;
 274
 275                 wait_event_interruptible(ecard_wait, ecard_req != NULL);
 276
 277                 req = xchg(&ecard_req, NULL);
 278                 if (req != NULL) {
 279                         req->fn(req);
 280                         complete(req->complete);
 281                 }
 282         }
 283 }
 284
 285 /*
 286  * Wake the expansion card daemon to action our request.
 287  *
 288  * FIXME: The test here is not sufficient to detect if the
 289  * kcardd is running.
 290  */
 291 static void ecard_call(struct ecard_request *req)
 292 {
 293         DECLARE_COMPLETION_ONSTACK(completion);
 294
 295         req->complete = &completion;
 296
 297         mutex_lock(&ecard_mutex);
 298         ecard_req = req;
 299         wake_up(&ecard_wait);
 300
 301         /*
 302          * Now wait for kecardd to run.
 303          */
 304         wait_for_completion(&completion);
 305         mutex_unlock(&ecard_mutex);
 306 }
 307
 308 /* ======================= Mid-level card control ===================== */
 309
 310 static void
 311 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
 312 {
 313         struct ecard_request req;
 314
 315         req.fn          = ecard_task_readbytes;
 316         req.ec          = ec;
 317         req.address     = off;
 318         req.length      = len;
 319         req.use_loader  = useld;
 320         req.buffer      = addr;
 321
 322         ecard_call(&req);
 323 }
 324
 325 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
 326 {
 327         struct ex_chunk_dir excd;
 328         int index = 16;
 329         int useld = 0;
 330
 331         if (!ec->cid.cd)
 332                 return 0;
 333
 334         while(1) {
 335                 ecard_readbytes(&excd, ec, index, 8, useld);
 336                 index += 8;
 337                 if (c_id(&excd) == 0) {
 338                         if (!useld && ec->loader) {
 339                                 useld = 1;
 340                                 index = 0;
 341                                 continue;
 342                         }
 343                         return 0;
 344                 }
 345                 if (c_id(&excd) == 0xf0) { /* link */
 346                         index = c_start(&excd);
 347                         continue;
 348                 }
 349                 if (c_id(&excd) == 0x80) { /* loader */
 350                         if (!ec->loader) {
 351                                 ec->loader = kmalloc(c_len(&excd),
 352                                                                GFP_KERNEL);
 353                                 if (ec->loader)
 354                                         ecard_readbytes(ec->loader, ec,
 355                                                         (int)c_start(&excd),
 356                                                         c_len(&excd), useld);
 357                                 else
 358                                         return 0;
 359                         }
 360                         continue;
 361                 }
 362                 if (c_id(&excd) == id && num-- == 0)
 363                         break;
 364         }
 365
 366         if (c_id(&excd) & 0x80) {
 367                 switch (c_id(&excd) & 0x70) {
 368                 case 0x70:
 369                         ecard_readbytes((unsigned char *)excd.d.string, ec,
 370                                         (int)c_start(&excd), c_len(&excd),
 371                                         useld);
 372                         break;
 373                 case 0x00:
 374                         break;
 375                 }
 376         }
 377         cd->start_offset = c_start(&excd);
 378         memcpy(cd->d.string, excd.d.string, 256);
 379         return 1;
 380 }
 381
 382 /* ======================= Interrupt control ============================ */
 383
 384 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 385 {
 386 }
 387
 388 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 389 {
 390 }
 391
 392 static int ecard_def_irq_pending(ecard_t *ec)
 393 {
 394         return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
 395 }
 396
 397 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 398 {
 399         panic("ecard_def_fiq_enable called - impossible");
 400 }
 401
 402 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 403 {
 404         panic("ecard_def_fiq_disable called - impossible");
 405 }
 406
 407 static int ecard_def_fiq_pending(ecard_t *ec)
 408 {
 409         return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
 410 }
 411
 412 static expansioncard_ops_t ecard_default_ops = {
 413         ecard_def_irq_enable,
 414         ecard_def_irq_disable,
 415         ecard_def_irq_pending,
 416         ecard_def_fiq_enable,
 417         ecard_def_fiq_disable,
 418         ecard_def_fiq_pending
 419 };
 420
 421 /*
 422  * Enable and disable interrupts from expansion cards.
 423  * (interrupts are disabled for these functions).
 424  *
 425  * They are not meant to be called directly, but via enable/disable_irq.
 426  */
 427 static void ecard_irq_unmask(struct irq_data *d)
 428 {
 429         ecard_t *ec = irq_data_get_irq_chip_data(d);
 430
 431         if (ec) {
 432                 if (!ec->ops)
 433                         ec->ops = &ecard_default_ops;
 434
 435                 if (ec->claimed && ec->ops->irqenable)
 436                         ec->ops->irqenable(ec, d->irq);
 437                 else
 438                         printk(KERN_ERR "ecard: rejecting request to "
 439                                 "enable IRQs for %d\n", d->irq);
 440         }
 441 }
 442
 443 static void ecard_irq_mask(struct irq_data *d)
 444 {
 445         ecard_t *ec = irq_data_get_irq_chip_data(d);
 446
 447         if (ec) {
 448                 if (!ec->ops)
 449                         ec->ops = &ecard_default_ops;
 450
 451                 if (ec->ops && ec->ops->irqdisable)
 452                         ec->ops->irqdisable(ec, d->irq);
 453         }
 454 }
 455
 456 static struct irq_chip ecard_chip = {
 457         .name           = "ECARD",
 458         .irq_ack        = ecard_irq_mask,
 459         .irq_mask       = ecard_irq_mask,
 460         .irq_unmask     = ecard_irq_unmask,
 461 };
 462
 463 void ecard_enablefiq(unsigned int fiqnr)
 464 {
 465         ecard_t *ec = slot_to_ecard(fiqnr);
 466
 467         if (ec) {
 468                 if (!ec->ops)
 469                         ec->ops = &ecard_default_ops;
 470
 471                 if (ec->claimed && ec->ops->fiqenable)
 472                         ec->ops->fiqenable(ec, fiqnr);
 473                 else
 474                         printk(KERN_ERR "ecard: rejecting request to "
 475                                 "enable FIQs for %d\n", fiqnr);
 476         }
 477 }
 478
 479 void ecard_disablefiq(unsigned int fiqnr)
 480 {
 481         ecard_t *ec = slot_to_ecard(fiqnr);
 482
 483         if (ec) {
 484                 if (!ec->ops)
 485                         ec->ops = &ecard_default_ops;
 486
 487                 if (ec->ops->fiqdisable)
 488                         ec->ops->fiqdisable(ec, fiqnr);
 489         }
 490 }
 491
 492 static void ecard_dump_irq_state(void)
 493 {
 494         ecard_t *ec;
 495
 496         printk("Expansion card IRQ state:\n");
 497
 498         for (ec = cards; ec; ec = ec->next) {
 499                 if (ec->slot_no == 8)
 500                         continue;
 501
 502                 printk("  %d: %sclaimed, ",
 503                        ec->slot_no, ec->claimed ? "" : "not ");
 504
 505                 if (ec->ops && ec->ops->irqpending &&
 506                     ec->ops != &ecard_default_ops)
 507                         printk("irq %spending\n",
 508                                ec->ops->irqpending(ec) ? "" : "not ");
 509                 else
 510                         printk("irqaddr %p, mask = %02X, status = %02X\n",
 511                                ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
 512         }
 513 }
 514
 515 static void ecard_check_lockup(struct irq_desc *desc)
 516 {
 517         static unsigned long last;
 518         static int lockup;
 519
 520         /*
 521          * If the timer interrupt has not run since the last million
 522          * unrecognised expansion card interrupts, then there is
 523          * something seriously wrong.  Disable the expansion card
 524          * interrupts so at least we can continue.
 525          *
 526          * Maybe we ought to start a timer to re-enable them some time
 527          * later?
 528          */
 529         if (last == jiffies) {
 530                 lockup += 1;
 531                 if (lockup > 1000000) {
 532                         printk(KERN_ERR "\nInterrupt lockup detected - "
 533                                "disabling all expansion card interrupts\n");
 534
 535                         desc->irq_data.chip->irq_mask(&desc->irq_data);
 536                         ecard_dump_irq_state();
 537                 }
 538         } else
 539                 lockup = 0;
 540
 541         /*
 542          * If we did not recognise the source of this interrupt,
 543          * warn the user, but don't flood the user with these messages.
 544          */
 545         if (!last || time_after(jiffies, last + 5*HZ)) {
 546                 last = jiffies;
 547                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 548                 ecard_dump_irq_state();
 549         }
 550 }
 551
 552 static void ecard_irq_handler(struct irq_desc *desc)
 553 {
 554         ecard_t *ec;
 555         int called = 0;
 556
 557         desc->irq_data.chip->irq_mask(&desc->irq_data);
 558         for (ec = cards; ec; ec = ec->next) {
 559                 int pending;
 560
 561                 if (!ec->claimed || !ec->irq || ec->slot_no == 8)
 562                         continue;
 563
 564                 if (ec->ops && ec->ops->irqpending)
 565                         pending = ec->ops->irqpending(ec);
 566                 else
 567                         pending = ecard_default_ops.irqpending(ec);
 568
 569                 if (pending) {
 570                         generic_handle_irq(ec->irq);
 571                         called ++;
 572                 }
 573         }
 574         desc->irq_data.chip->irq_unmask(&desc->irq_data);
 575
 576         if (called == 0)
 577                 ecard_check_lockup(desc);
 578 }
 579
 580 static void __iomem *__ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 581 {
 582         void __iomem *address = NULL;
 583         int slot = ec->slot_no;
 584
 585         if (ec->slot_no == 8)
 586                 return ECARD_MEMC8_BASE;
 587
 588         ectcr &= ~(1 << slot);
 589
 590         switch (type) {
 591         case ECARD_MEMC:
 592                 if (slot < 4)
 593                         address = ECARD_MEMC_BASE + (slot << 14);
 594                 break;
 595
 596         case ECARD_IOC:
 597                 if (slot < 4)
 598                         address = ECARD_IOC_BASE + (slot << 14);
 599                 else
 600                         address = ECARD_IOC4_BASE + ((slot - 4) << 14);
 601                 if (address)
 602                         address += speed << 19;
 603                 break;
 604
 605         case ECARD_EASI:
 606                 address = ECARD_EASI_BASE + (slot << 24);
 607                 if (speed == ECARD_FAST)
 608                         ectcr |= 1 << slot;
 609                 break;
 610
 611         default:
 612                 break;
 613         }
 614
 615 #ifdef IOMD_ECTCR
 616         iomd_writeb(ectcr, IOMD_ECTCR);
 617 #endif
 618         return address;
 619 }
 620
 621 static int ecard_prints(struct seq_file *m, ecard_t *ec)
 622 {
 623         seq_printf(m, "  %d: %s ", ec->slot_no, ec->easi ? "EASI" : "    ");
 624
 625         if (ec->cid.id == 0) {
 626                 struct in_chunk_dir incd;
 627
 628                 seq_printf(m, "[%04X:%04X] ",
 629                         ec->cid.manufacturer, ec->cid.product);
 630
 631                 if (!ec->card_desc && ec->cid.cd &&
 632                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 633                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 634
 635                         if (ec->card_desc)
 636                                 strcpy((char *)ec->card_desc, incd.d.string);
 637                 }
 638
 639                 seq_printf(m, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 640         } else
 641                 seq_printf(m, "Simple card %d\n", ec->cid.id);
 642
 643         return 0;
 644 }
 645
 646 static int ecard_devices_proc_show(struct seq_file *m, void *v)
 647 {
 648         ecard_t *ec = cards;
 649
 650         while (ec) {
 651                 ecard_prints(m, ec);
 652                 ec = ec->next;
 653         }
 654         return 0;
 655 }
 656
 657 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 658
 659 static void ecard_proc_init(void)
 660 {
 661         proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL);
 662         proc_create_single("devices", 0, proc_bus_ecard_dir,
 663                         ecard_devices_proc_show);
 664 }
 665
 666 #define ec_set_resource(ec,nr,st,sz)                            \
 667         do {                                                    \
 668                 (ec)->resource[nr].name = dev_name(&ec->dev);   \
 669                 (ec)->resource[nr].start = st;                  \
 670                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 671                 (ec)->resource[nr].flags = IORESOURCE_MEM;      \
 672         } while (0)
 673
 674 static void __init ecard_free_card(struct expansion_card *ec)
 675 {
 676         int i;
 677
 678         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 679                 if (ec->resource[i].flags)
 680                         release_resource(&ec->resource[i]);
 681
 682         kfree(ec);
 683 }
 684
 685 static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 686 {
 687         struct expansion_card *ec;
 688         unsigned long base;
 689         int i;
 690
 691         ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
 692         if (!ec) {
 693                 ec = ERR_PTR(-ENOMEM);
 694                 goto nomem;
 695         }
 696
 697         ec->slot_no = slot;
 698         ec->easi = type == ECARD_EASI;
 699         ec->irq = 0;
 700         ec->fiq = 0;
 701         ec->dma = NO_DMA;
 702         ec->ops = &ecard_default_ops;
 703
 704         dev_set_name(&ec->dev, "ecard%d", slot);
 705         ec->dev.parent = NULL;
 706         ec->dev.bus = &ecard_bus_type;
 707         ec->dev.dma_mask = &ec->dma_mask;
 708         ec->dma_mask = (u64)0xffffffff;
 709         ec->dev.coherent_dma_mask = ec->dma_mask;
 710
 711         if (slot < 4) {
 712                 ec_set_resource(ec, ECARD_RES_MEMC,
 713                                 PODSLOT_MEMC_BASE + (slot << 14),
 714                                 PODSLOT_MEMC_SIZE);
 715                 base = PODSLOT_IOC0_BASE + (slot << 14);
 716         } else
 717                 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
 718
 719 #ifdef CONFIG_ARCH_RPC
 720         if (slot < 8) {
 721                 ec_set_resource(ec, ECARD_RES_EASI,
 722                                 PODSLOT_EASI_BASE + (slot << 24),
 723                                 PODSLOT_EASI_SIZE);
 724         }
 725
 726         if (slot == 8) {
 727                 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
 728         } else
 729 #endif
 730
 731         for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
 732                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 733                                 base + (i << 19), PODSLOT_IOC_SIZE);
 734
 735         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 736                 if (ec->resource[i].flags &&
 737                     request_resource(&iomem_resource, &ec->resource[i])) {
 738                         dev_err(&ec->dev, "resource(s) not available\n");
 739                         ec->resource[i].end -= ec->resource[i].start;
 740                         ec->resource[i].start = 0;
 741                         ec->resource[i].flags = 0;
 742                 }
 743         }
 744
 745  nomem:
 746         return ec;
 747 }
 748
 749 static ssize_t irq_show(struct device *dev, struct device_attribute *attr, char *buf)
 750 {
 751         struct expansion_card *ec = ECARD_DEV(dev);
 752         return sprintf(buf, "%u\n", ec->irq);
 753 }
 754 static DEVICE_ATTR_RO(irq);
 755
 756 static ssize_t dma_show(struct device *dev, struct device_attribute *attr, char *buf)
 757 {
 758         struct expansion_card *ec = ECARD_DEV(dev);
 759         return sprintf(buf, "%u\n", ec->dma);
 760 }
 761 static DEVICE_ATTR_RO(dma);
 762
 763 static ssize_t resource_show(struct device *dev, struct device_attribute *attr, char *buf)
 764 {
 765         struct expansion_card *ec = ECARD_DEV(dev);
 766         char *str = buf;
 767         int i;
 768
 769         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 770                 str += sprintf(str, "%08x %08x %08lx\n",
 771                                 ec->resource[i].start,
 772                                 ec->resource[i].end,
 773                                 ec->resource[i].flags);
 774
 775         return str - buf;
 776 }
 777 static DEVICE_ATTR_RO(resource);
 778
 779 static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
 780 {
 781         struct expansion_card *ec = ECARD_DEV(dev);
 782         return sprintf(buf, "%u\n", ec->cid.manufacturer);
 783 }
 784 static DEVICE_ATTR_RO(vendor);
 785
 786 static ssize_t device_show(struct device *dev, struct device_attribute *attr, char *buf)
 787 {
 788         struct expansion_card *ec = ECARD_DEV(dev);
 789         return sprintf(buf, "%u\n", ec->cid.product);
 790 }
 791 static DEVICE_ATTR_RO(device);
 792
 793 static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf)
 794 {
 795         struct expansion_card *ec = ECARD_DEV(dev);
 796         return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
 797 }
 798 static DEVICE_ATTR_RO(type);
 799
 800 static struct attribute *ecard_dev_attrs[] = {
 801         &dev_attr_device.attr,
 802         &dev_attr_dma.attr,
 803         &dev_attr_irq.attr,
 804         &dev_attr_resource.attr,
 805         &dev_attr_type.attr,
 806         &dev_attr_vendor.attr,
 807         NULL,
 808 };
 809 ATTRIBUTE_GROUPS(ecard_dev);
 810
 811 int ecard_request_resources(struct expansion_card *ec)
 812 {
 813         int i, err = 0;
 814
 815         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 816                 if (ecard_resource_end(ec, i) &&
 817                     !request_mem_region(ecard_resource_start(ec, i),
 818                                         ecard_resource_len(ec, i),
 819                                         ec->dev.driver->name)) {
 820                         err = -EBUSY;
 821                         break;
 822                 }
 823         }
 824
 825         if (err) {
 826                 while (i--)
 827                         if (ecard_resource_end(ec, i))
 828                                 release_mem_region(ecard_resource_start(ec, i),
 829                                                    ecard_resource_len(ec, i));
 830         }
 831         return err;
 832 }
 833 EXPORT_SYMBOL(ecard_request_resources);
 834
 835 void ecard_release_resources(struct expansion_card *ec)
 836 {
 837         int i;
 838
 839         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 840                 if (ecard_resource_end(ec, i))
 841                         release_mem_region(ecard_resource_start(ec, i),
 842                                            ecard_resource_len(ec, i));
 843 }
 844 EXPORT_SYMBOL(ecard_release_resources);
 845
 846 void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
 847 {
 848         ec->irq_data = irq_data;
 849         barrier();
 850         ec->ops = ops;
 851 }
 852 EXPORT_SYMBOL(ecard_setirq);
 853
 854 void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
 855                            unsigned long offset, unsigned long maxsize)
 856 {
 857         unsigned long start = ecard_resource_start(ec, res);
 858         unsigned long end = ecard_resource_end(ec, res);
 859
 860         if (offset > (end - start))
 861                 return NULL;
 862
 863         start += offset;
 864         if (maxsize && end - start > maxsize)
 865                 end = start + maxsize;
 866
 867         return devm_ioremap(&ec->dev, start, end - start);
 868 }
 869 EXPORT_SYMBOL(ecardm_iomap);
 870
 871 /*
 872  * Probe for an expansion card.
 873  *
 874  * If bit 1 of the first byte of the card is set, then the
 875  * card does not exist.
 876  */
 877 static int __init ecard_probe(int slot, unsigned irq, card_type_t type)
 878 {
 879         ecard_t **ecp;
 880         ecard_t *ec;
 881         struct ex_ecid cid;
 882         void __iomem *addr;
 883         int i, rc;
 884
 885         ec = ecard_alloc_card(type, slot);
 886         if (IS_ERR(ec)) {
 887                 rc = PTR_ERR(ec);
 888                 goto nomem;
 889         }
 890
 891         rc = -ENODEV;
 892         if ((addr = __ecard_address(ec, type, ECARD_SYNC)) == NULL)
 893                 goto nodev;
 894
 895         cid.r_zero = 1;
 896         ecard_readbytes(&cid, ec, 0, 16, 0);
 897         if (cid.r_zero)
 898                 goto nodev;
 899
 900         ec->cid.id      = cid.r_id;
 901         ec->cid.cd      = cid.r_cd;
 902         ec->cid.is      = cid.r_is;
 903         ec->cid.w       = cid.r_w;
 904         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
 905         ec->cid.product = ecard_getu16(cid.r_prod);
 906         ec->cid.country = cid.r_country;
 907         ec->cid.irqmask = cid.r_irqmask;
 908         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
 909         ec->cid.fiqmask = cid.r_fiqmask;
 910         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
 911         ec->fiqaddr     =
 912         ec->irqaddr     = addr;
 913
 914         if (ec->cid.is) {
 915                 ec->irqmask = ec->cid.irqmask;
 916                 ec->irqaddr += ec->cid.irqoff;
 917                 ec->fiqmask = ec->cid.fiqmask;
 918                 ec->fiqaddr += ec->cid.fiqoff;
 919         } else {
 920                 ec->irqmask = 1;
 921                 ec->fiqmask = 4;
 922         }
 923
 924         for (i = 0; i < ARRAY_SIZE(blacklist); i++)
 925                 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
 926                     blacklist[i].product == ec->cid.product) {
 927                         ec->card_desc = blacklist[i].type;
 928                         break;
 929                 }
 930
 931         ec->irq = irq;
 932
 933         /*
 934          * hook the interrupt handlers
 935          */
 936         if (slot < 8) {
 937                 irq_set_chip_and_handler(ec->irq, &ecard_chip,
 938                                          handle_level_irq);
 939                 irq_set_chip_data(ec->irq, ec);
 940                 irq_clear_status_flags(ec->irq, IRQ_NOREQUEST);
 941         }
 942
 943 #ifdef CONFIG_ARCH_RPC
 944         /* On RiscPC, only first two slots have DMA capability */
 945         if (slot < 2)
 946                 ec->dma = 2 + slot;
 947 #endif
 948
 949         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
 950
 951         *ecp = ec;
 952         slot_to_expcard[slot] = ec;
 953
 954         rc = device_register(&ec->dev);
 955         if (rc)
 956                 goto nodev;
 957
 958         return 0;
 959
 960  nodev:
 961         ecard_free_card(ec);
 962  nomem:
 963         return rc;
 964 }
 965
 966 /*
 967  * Initialise the expansion card system.
 968  * Locate all hardware - interrupt management and
 969  * actual cards.
 970  */
 971 static int __init ecard_init(void)
 972 {
 973         struct task_struct *task;
 974         int slot, irqbase;
 975
 976         irqbase = irq_alloc_descs(-1, 0, 8, -1);
 977         if (irqbase < 0)
 978                 return irqbase;
 979
 980         task = kthread_run(ecard_task, NULL, "kecardd");
 981         if (IS_ERR(task)) {
 982                 printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
 983                        PTR_ERR(task));
 984                 irq_free_descs(irqbase, 8);
 985                 return PTR_ERR(task);
 986         }
 987
 988         printk("Probing expansion cards\n");
 989
 990         for (slot = 0; slot < 8; slot ++) {
 991                 if (ecard_probe(slot, irqbase + slot, ECARD_EASI) == -ENODEV)
 992                         ecard_probe(slot, irqbase + slot, ECARD_IOC);
 993         }
 994
 995         ecard_probe(8, 11, ECARD_IOC);
 996
 997         irq_set_chained_handler(IRQ_EXPANSIONCARD, ecard_irq_handler);
 998
 999         ecard_proc_init();
1000
1001         return 0;
1002 }
1003
1004 subsys_initcall(ecard_init);
1005
1006 /*
1007  *      ECARD "bus"
1008  */
1009 static const struct ecard_id *
1010 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1011 {
1012         int i;
1013
1014         for (i = 0; ids[i].manufacturer != 65535; i++)
1015                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1016                     ec->cid.product == ids[i].product)
1017                         return ids + i;
1018
1019         return NULL;
1020 }
1021
1022 static int ecard_drv_probe(struct device *dev)
1023 {
1024         struct expansion_card *ec = ECARD_DEV(dev);
1025         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1026         const struct ecard_id *id;
1027         int ret;
1028
1029         id = ecard_match_device(drv->id_table, ec);
1030
1031         ec->claimed = 1;
1032         ret = drv->probe(ec, id);
1033         if (ret)
1034                 ec->claimed = 0;
1035         return ret;
1036 }
1037
1038 static int ecard_drv_remove(struct device *dev)
1039 {
1040         struct expansion_card *ec = ECARD_DEV(dev);
1041         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1042
1043         drv->remove(ec);
1044         ec->claimed = 0;
1045
1046         /*
1047          * Restore the default operations.  We ensure that the
1048          * ops are set before we change the data.
1049          */
1050         ec->ops = &ecard_default_ops;
1051         barrier();
1052         ec->irq_data = NULL;
1053
1054         return 0;
1055 }
1056
1057 /*
1058  * Before rebooting, we must make sure that the expansion card is in a
1059  * sensible state, so it can be re-detected.  This means that the first
1060  * page of the ROM must be visible.  We call the expansion cards reset
1061  * handler, if any.
1062  */
1063 static void ecard_drv_shutdown(struct device *dev)
1064 {
1065         struct expansion_card *ec = ECARD_DEV(dev);
1066         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1067         struct ecard_request req;
1068
1069         if (dev->driver) {
1070                 if (drv->shutdown)
1071                         drv->shutdown(ec);
1072                 ec->claimed = 0;
1073         }
1074
1075         /*
1076          * If this card has a loader, call the reset handler.
1077          */
1078         if (ec->loader) {
1079                 req.fn = ecard_task_reset;
1080                 req.ec = ec;
1081                 ecard_call(&req);
1082         }
1083 }
1084
1085 int ecard_register_driver(struct ecard_driver *drv)
1086 {
1087         drv->drv.bus = &ecard_bus_type;
1088
1089         return driver_register(&drv->drv);
1090 }
1091
1092 void ecard_remove_driver(struct ecard_driver *drv)
1093 {
1094         driver_unregister(&drv->drv);
1095 }
1096
1097 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1098 {
1099         struct expansion_card *ec = ECARD_DEV(_dev);
1100         struct ecard_driver *drv = ECARD_DRV(_drv);
1101         int ret;
1102
1103         if (drv->id_table) {
1104                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1105         } else {
1106                 ret = ec->cid.id == drv->id;
1107         }
1108
1109         return ret;
1110 }
1111
1112 struct bus_type ecard_bus_type = {
1113         .name           = "ecard",
1114         .dev_groups     = ecard_dev_groups,
1115         .match          = ecard_match,
1116         .probe          = ecard_drv_probe,
1117         .remove         = ecard_drv_remove,
1118         .shutdown       = ecard_drv_shutdown,
1119 };
1120
1121 static int ecard_bus_init(void)
1122 {
1123         return bus_register(&ecard_bus_type);
1124 }
1125
1126 postcore_initcall(ecard_bus_init);
1127
1128 EXPORT_SYMBOL(ecard_readchunk);
1129 EXPORT_SYMBOL(ecard_register_driver);
1130 EXPORT_SYMBOL(ecard_remove_driver);
1131 EXPORT_SYMBOL(ecard_bus_type);