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/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/types.h>
  33 #include <linux/sched.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/completion.h>
  36 #include <linux/reboot.h>
  37 #include <linux/mm.h>
  38 #include <linux/slab.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/device.h>
  41 #include <linux/init.h>
  42 #include <linux/mutex.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(unsigned long base, loader_t loader);
  89 asmlinkage extern int
  90 ecard_loader_read(int off, unsigned long base, loader_t loader);
  91
  92 static inline unsigned short ecard_getu16(unsigned char *v)
  93 {
  94         return v[0] | v[1] << 8;
  95 }
  96
  97 static inline signed long ecard_gets24(unsigned char *v)
  98 {
  99         return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
 100 }
 101
 102 static inline ecard_t *slot_to_ecard(unsigned int slot)
 103 {
 104         return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
 105 }
 106
 107 /* ===================== Expansion card daemon ======================== */
 108 /*
 109  * Since the loader programs on the expansion cards need to be run
 110  * in a specific environment, create a separate task with this
 111  * environment up, and pass requests to this task as and when we
 112  * need to.
 113  *
 114  * This should allow 99% of loaders to be called from Linux.
 115  *
 116  * From a security standpoint, we trust the card vendors.  This
 117  * may be a misplaced trust.
 118  */
 119 static void ecard_task_reset(struct ecard_request *req)
 120 {
 121         struct expansion_card *ec = req->ec;
 122         struct resource *res;
 123
 124         res = ec->slot_no == 8
 125                 ? &ec->resource[ECARD_RES_MEMC]
 126                 : ec->type == ECARD_EASI
 127                   ? &ec->resource[ECARD_RES_EASI]
 128                   : &ec->resource[ECARD_RES_IOCSYNC];
 129
 130         ecard_loader_reset(res->start, ec->loader);
 131 }
 132
 133 static void ecard_task_readbytes(struct ecard_request *req)
 134 {
 135         struct expansion_card *ec = req->ec;
 136         unsigned char *buf = req->buffer;
 137         unsigned int len = req->length;
 138         unsigned int off = req->address;
 139
 140         if (ec->slot_no == 8) {
 141                 void __iomem *base = (void __iomem *)
 142                                 ec->resource[ECARD_RES_MEMC].start;
 143
 144                 /*
 145                  * The card maintains an index which increments the address
 146                  * into a 4096-byte page on each access.  We need to keep
 147                  * track of the counter.
 148                  */
 149                 static unsigned int index;
 150                 unsigned int page;
 151
 152                 page = (off >> 12) * 4;
 153                 if (page > 256 * 4)
 154                         return;
 155
 156                 off &= 4095;
 157
 158                 /*
 159                  * If we are reading offset 0, or our current index is
 160                  * greater than the offset, reset the hardware index counter.
 161                  */
 162                 if (off == 0 || index > off) {
 163                         writeb(0, base);
 164                         index = 0;
 165                 }
 166
 167                 /*
 168                  * Increment the hardware index counter until we get to the
 169                  * required offset.  The read bytes are discarded.
 170                  */
 171                 while (index < off) {
 172                         readb(base + page);
 173                         index += 1;
 174                 }
 175
 176                 while (len--) {
 177                         *buf++ = readb(base + page);
 178                         index += 1;
 179                 }
 180         } else {
 181                 unsigned long base = (ec->type == ECARD_EASI
 182                          ? &ec->resource[ECARD_RES_EASI]
 183                          : &ec->resource[ECARD_RES_IOCSYNC])->start;
 184                 void __iomem *pbase = (void __iomem *)base;
 185
 186                 if (!req->use_loader || !ec->loader) {
 187                         off *= 4;
 188                         while (len--) {
 189                                 *buf++ = readb(pbase + off);
 190                                 off += 4;
 191                         }
 192                 } else {
 193                         while(len--) {
 194                                 /*
 195                                  * The following is required by some
 196                                  * expansion card loader programs.
 197                                  */
 198                                 *(unsigned long *)0x108 = 0;
 199                                 *buf++ = ecard_loader_read(off++, base,
 200                                                            ec->loader);
 201                         }
 202                 }
 203         }
 204
 205 }
 206
 207 static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
 208 static struct ecard_request *ecard_req;
 209 static DEFINE_MUTEX(ecard_mutex);
 210
 211 /*
 212  * Set up the expansion card daemon's page tables.
 213  */
 214 static void ecard_init_pgtables(struct mm_struct *mm)
 215 {
 216         struct vm_area_struct vma;
 217
 218         /* We want to set up the page tables for the following mapping:
 219          *  Virtual     Physical
 220          *  0x03000000  0x03000000
 221          *  0x03010000  unmapped
 222          *  0x03210000  0x03210000
 223          *  0x03400000  unmapped
 224          *  0x08000000  0x08000000
 225          *  0x10000000  unmapped
 226          *
 227          * FIXME: we don't follow this 100% yet.
 228          */
 229         pgd_t *src_pgd, *dst_pgd;
 230
 231         src_pgd = pgd_offset(mm, (unsigned long)IO_BASE);
 232         dst_pgd = pgd_offset(mm, IO_START);
 233
 234         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));
 235
 236         src_pgd = pgd_offset(mm, EASI_BASE);
 237         dst_pgd = pgd_offset(mm, EASI_START);
 238
 239         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));
 240
 241         vma.vm_mm = mm;
 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         daemonize("kecardd");
 267
 268         /*
 269          * Allocate a mm.  We're not a lazy-TLB kernel task since we need
 270          * to set page table entries where the user space would be.  Note
 271          * that this also creates the page tables.  Failure is not an
 272          * option here.
 273          */
 274         if (ecard_init_mm())
 275                 panic("kecardd: unable to alloc mm\n");
 276
 277         while (1) {
 278                 struct ecard_request *req;
 279
 280                 wait_event_interruptible(ecard_wait, ecard_req != NULL);
 281
 282                 req = xchg(&ecard_req, NULL);
 283                 if (req != NULL) {
 284                         req->fn(req);
 285                         complete(req->complete);
 286                 }
 287         }
 288 }
 289
 290 /*
 291  * Wake the expansion card daemon to action our request.
 292  *
 293  * FIXME: The test here is not sufficient to detect if the
 294  * kcardd is running.
 295  */
 296 static void ecard_call(struct ecard_request *req)
 297 {
 298         DECLARE_COMPLETION(completion);
 299
 300         req->complete = &completion;
 301
 302         mutex_lock(&ecard_mutex);
 303         ecard_req = req;
 304         wake_up(&ecard_wait);
 305
 306         /*
 307          * Now wait for kecardd to run.
 308          */
 309         wait_for_completion(&completion);
 310         mutex_unlock(&ecard_mutex);
 311 }
 312
 313 /* ======================= Mid-level card control ===================== */
 314
 315 static void
 316 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
 317 {
 318         struct ecard_request req;
 319
 320         req.fn          = ecard_task_readbytes;
 321         req.ec          = ec;
 322         req.address     = off;
 323         req.length      = len;
 324         req.use_loader  = useld;
 325         req.buffer      = addr;
 326
 327         ecard_call(&req);
 328 }
 329
 330 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
 331 {
 332         struct ex_chunk_dir excd;
 333         int index = 16;
 334         int useld = 0;
 335
 336         if (!ec->cid.cd)
 337                 return 0;
 338
 339         while(1) {
 340                 ecard_readbytes(&excd, ec, index, 8, useld);
 341                 index += 8;
 342                 if (c_id(&excd) == 0) {
 343                         if (!useld && ec->loader) {
 344                                 useld = 1;
 345                                 index = 0;
 346                                 continue;
 347                         }
 348                         return 0;
 349                 }
 350                 if (c_id(&excd) == 0xf0) { /* link */
 351                         index = c_start(&excd);
 352                         continue;
 353                 }
 354                 if (c_id(&excd) == 0x80) { /* loader */
 355                         if (!ec->loader) {
 356                                 ec->loader = (loader_t)kmalloc(c_len(&excd),
 357                                                                GFP_KERNEL);
 358                                 if (ec->loader)
 359                                         ecard_readbytes(ec->loader, ec,
 360                                                         (int)c_start(&excd),
 361                                                         c_len(&excd), useld);
 362                                 else
 363                                         return 0;
 364                         }
 365                         continue;
 366                 }
 367                 if (c_id(&excd) == id && num-- == 0)
 368                         break;
 369         }
 370
 371         if (c_id(&excd) & 0x80) {
 372                 switch (c_id(&excd) & 0x70) {
 373                 case 0x70:
 374                         ecard_readbytes((unsigned char *)excd.d.string, ec,
 375                                         (int)c_start(&excd), c_len(&excd),
 376                                         useld);
 377                         break;
 378                 case 0x00:
 379                         break;
 380                 }
 381         }
 382         cd->start_offset = c_start(&excd);
 383         memcpy(cd->d.string, excd.d.string, 256);
 384         return 1;
 385 }
 386
 387 /* ======================= Interrupt control ============================ */
 388
 389 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 390 {
 391 #ifdef HAS_EXPMASK
 392         if (irqnr < 4 && have_expmask) {
 393                 have_expmask |= 1 << irqnr;
 394                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 395         }
 396 #endif
 397 }
 398
 399 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 400 {
 401 #ifdef HAS_EXPMASK
 402         if (irqnr < 4 && have_expmask) {
 403                 have_expmask &= ~(1 << irqnr);
 404                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 405         }
 406 #endif
 407 }
 408
 409 static int ecard_def_irq_pending(ecard_t *ec)
 410 {
 411         return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
 412 }
 413
 414 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 415 {
 416         panic("ecard_def_fiq_enable called - impossible");
 417 }
 418
 419 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 420 {
 421         panic("ecard_def_fiq_disable called - impossible");
 422 }
 423
 424 static int ecard_def_fiq_pending(ecard_t *ec)
 425 {
 426         return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
 427 }
 428
 429 static expansioncard_ops_t ecard_default_ops = {
 430         ecard_def_irq_enable,
 431         ecard_def_irq_disable,
 432         ecard_def_irq_pending,
 433         ecard_def_fiq_enable,
 434         ecard_def_fiq_disable,
 435         ecard_def_fiq_pending
 436 };
 437
 438 /*
 439  * Enable and disable interrupts from expansion cards.
 440  * (interrupts are disabled for these functions).
 441  *
 442  * They are not meant to be called directly, but via enable/disable_irq.
 443  */
 444 static void ecard_irq_unmask(unsigned int irqnr)
 445 {
 446         ecard_t *ec = slot_to_ecard(irqnr - 32);
 447
 448         if (ec) {
 449                 if (!ec->ops)
 450                         ec->ops = &ecard_default_ops;
 451
 452                 if (ec->claimed && ec->ops->irqenable)
 453                         ec->ops->irqenable(ec, irqnr);
 454                 else
 455                         printk(KERN_ERR "ecard: rejecting request to "
 456                                 "enable IRQs for %d\n", irqnr);
 457         }
 458 }
 459
 460 static void ecard_irq_mask(unsigned int irqnr)
 461 {
 462         ecard_t *ec = slot_to_ecard(irqnr - 32);
 463
 464         if (ec) {
 465                 if (!ec->ops)
 466                         ec->ops = &ecard_default_ops;
 467
 468                 if (ec->ops && ec->ops->irqdisable)
 469                         ec->ops->irqdisable(ec, irqnr);
 470         }
 471 }
 472
 473 static struct irqchip ecard_chip = {
 474         .ack    = ecard_irq_mask,
 475         .mask   = ecard_irq_mask,
 476         .unmask = ecard_irq_unmask,
 477 };
 478
 479 void ecard_enablefiq(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->claimed && ec->ops->fiqenable)
 488                         ec->ops->fiqenable(ec, fiqnr);
 489                 else
 490                         printk(KERN_ERR "ecard: rejecting request to "
 491                                 "enable FIQs for %d\n", fiqnr);
 492         }
 493 }
 494
 495 void ecard_disablefiq(unsigned int fiqnr)
 496 {
 497         ecard_t *ec = slot_to_ecard(fiqnr);
 498
 499         if (ec) {
 500                 if (!ec->ops)
 501                         ec->ops = &ecard_default_ops;
 502
 503                 if (ec->ops->fiqdisable)
 504                         ec->ops->fiqdisable(ec, fiqnr);
 505         }
 506 }
 507
 508 static void ecard_dump_irq_state(void)
 509 {
 510         ecard_t *ec;
 511
 512         printk("Expansion card IRQ state:\n");
 513
 514         for (ec = cards; ec; ec = ec->next) {
 515                 if (ec->slot_no == 8)
 516                         continue;
 517
 518                 printk("  %d: %sclaimed, ",
 519                        ec->slot_no, ec->claimed ? "" : "not ");
 520
 521                 if (ec->ops && ec->ops->irqpending &&
 522                     ec->ops != &ecard_default_ops)
 523                         printk("irq %spending\n",
 524                                ec->ops->irqpending(ec) ? "" : "not ");
 525                 else
 526                         printk("irqaddr %p, mask = %02X, status = %02X\n",
 527                                ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
 528         }
 529 }
 530
 531 static void ecard_check_lockup(struct irqdesc *desc)
 532 {
 533         static unsigned long last;
 534         static int lockup;
 535
 536         /*
 537          * If the timer interrupt has not run since the last million
 538          * unrecognised expansion card interrupts, then there is
 539          * something seriously wrong.  Disable the expansion card
 540          * interrupts so at least we can continue.
 541          *
 542          * Maybe we ought to start a timer to re-enable them some time
 543          * later?
 544          */
 545         if (last == jiffies) {
 546                 lockup += 1;
 547                 if (lockup > 1000000) {
 548                         printk(KERN_ERR "\nInterrupt lockup detected - "
 549                                "disabling all expansion card interrupts\n");
 550
 551                         desc->chip->mask(IRQ_EXPANSIONCARD);
 552                         ecard_dump_irq_state();
 553                 }
 554         } else
 555                 lockup = 0;
 556
 557         /*
 558          * If we did not recognise the source of this interrupt,
 559          * warn the user, but don't flood the user with these messages.
 560          */
 561         if (!last || time_after(jiffies, last + 5*HZ)) {
 562                 last = jiffies;
 563                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 564                 ecard_dump_irq_state();
 565         }
 566 }
 567
 568 static void
 569 ecard_irq_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 570 {
 571         ecard_t *ec;
 572         int called = 0;
 573
 574         desc->chip->mask(irq);
 575         for (ec = cards; ec; ec = ec->next) {
 576                 int pending;
 577
 578                 if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
 579                         continue;
 580
 581                 if (ec->ops && ec->ops->irqpending)
 582                         pending = ec->ops->irqpending(ec);
 583                 else
 584                         pending = ecard_default_ops.irqpending(ec);
 585
 586                 if (pending) {
 587                         struct irqdesc *d = irq_desc + ec->irq;
 588                         desc_handle_irq(ec->irq, d, regs);
 589                         called ++;
 590                 }
 591         }
 592         desc->chip->unmask(irq);
 593
 594         if (called == 0)
 595                 ecard_check_lockup(desc);
 596 }
 597
 598 #ifdef HAS_EXPMASK
 599 static unsigned char priority_masks[] =
 600 {
 601         0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
 602 };
 603
 604 static unsigned char first_set[] =
 605 {
 606         0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
 607         0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
 608 };
 609
 610 static void
 611 ecard_irqexp_handler(unsigned int irq, struct irqdesc *desc, struct pt_regs *regs)
 612 {
 613         const unsigned int statusmask = 15;
 614         unsigned int status;
 615
 616         status = __raw_readb(EXPMASK_STATUS) & statusmask;
 617         if (status) {
 618                 unsigned int slot = first_set[status];
 619                 ecard_t *ec = slot_to_ecard(slot);
 620
 621                 if (ec->claimed) {
 622                         struct irqdesc *d = irqdesc + ec->irq;
 623                         /*
 624                          * this ugly code is so that we can operate a
 625                          * prioritorising system:
 626                          *
 627                          * Card 0       highest priority
 628                          * Card 1
 629                          * Card 2
 630                          * Card 3       lowest priority
 631                          *
 632                          * Serial cards should go in 0/1, ethernet/scsi in 2/3
 633                          * otherwise you will lose serial data at high speeds!
 634                          */
 635                         desc_handle_irq(ec->irq, d, regs);
 636                 } else {
 637                         printk(KERN_WARNING "card%d: interrupt from unclaimed "
 638                                "card???\n", slot);
 639                         have_expmask &= ~(1 << slot);
 640                         __raw_writeb(have_expmask, EXPMASK_ENABLE);
 641                 }
 642         } else
 643                 printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
 644 }
 645
 646 static int __init ecard_probeirqhw(void)
 647 {
 648         ecard_t *ec;
 649         int found;
 650
 651         __raw_writeb(0x00, EXPMASK_ENABLE);
 652         __raw_writeb(0xff, EXPMASK_STATUS);
 653         found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
 654         __raw_writeb(0xff, EXPMASK_ENABLE);
 655
 656         if (found) {
 657                 printk(KERN_DEBUG "Expansion card interrupt "
 658                        "management hardware found\n");
 659
 660                 /* for each card present, set a bit to '1' */
 661                 have_expmask = 0x80000000;
 662
 663                 for (ec = cards; ec; ec = ec->next)
 664                         have_expmask |= 1 << ec->slot_no;
 665
 666                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 667         }
 668
 669         return found;
 670 }
 671 #else
 672 #define ecard_irqexp_handler NULL
 673 #define ecard_probeirqhw() (0)
 674 #endif
 675
 676 #ifndef IO_EC_MEMC8_BASE
 677 #define IO_EC_MEMC8_BASE 0
 678 #endif
 679
 680 unsigned int __ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 681 {
 682         unsigned long address = 0;
 683         int slot = ec->slot_no;
 684
 685         if (ec->slot_no == 8)
 686                 return IO_EC_MEMC8_BASE;
 687
 688         ectcr &= ~(1 << slot);
 689
 690         switch (type) {
 691         case ECARD_MEMC:
 692                 if (slot < 4)
 693                         address = IO_EC_MEMC_BASE + (slot << 12);
 694                 break;
 695
 696         case ECARD_IOC:
 697                 if (slot < 4)
 698                         address = IO_EC_IOC_BASE + (slot << 12);
 699 #ifdef IO_EC_IOC4_BASE
 700                 else
 701                         address = IO_EC_IOC4_BASE + ((slot - 4) << 12);
 702 #endif
 703                 if (address)
 704                         address +=  speed << 17;
 705                 break;
 706
 707 #ifdef IO_EC_EASI_BASE
 708         case ECARD_EASI:
 709                 address = IO_EC_EASI_BASE + (slot << 22);
 710                 if (speed == ECARD_FAST)
 711                         ectcr |= 1 << slot;
 712                 break;
 713 #endif
 714         default:
 715                 break;
 716         }
 717
 718 #ifdef IOMD_ECTCR
 719         iomd_writeb(ectcr, IOMD_ECTCR);
 720 #endif
 721         return address;
 722 }
 723
 724 static int ecard_prints(char *buffer, ecard_t *ec)
 725 {
 726         char *start = buffer;
 727
 728         buffer += sprintf(buffer, "  %d: %s ", ec->slot_no,
 729                           ec->type == ECARD_EASI ? "EASI" : "    ");
 730
 731         if (ec->cid.id == 0) {
 732                 struct in_chunk_dir incd;
 733
 734                 buffer += sprintf(buffer, "[%04X:%04X] ",
 735                         ec->cid.manufacturer, ec->cid.product);
 736
 737                 if (!ec->card_desc && ec->cid.cd &&
 738                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 739                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 740
 741                         if (ec->card_desc)
 742                                 strcpy((char *)ec->card_desc, incd.d.string);
 743                 }
 744
 745                 buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 746         } else
 747                 buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);
 748
 749         return buffer - start;
 750 }
 751
 752 static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
 753 {
 754         ecard_t *ec = cards;
 755         off_t at = 0;
 756         int len, cnt;
 757
 758         cnt = 0;
 759         while (ec && count > cnt) {
 760                 len = ecard_prints(buf, ec);
 761                 at += len;
 762                 if (at >= pos) {
 763                         if (!*start) {
 764                                 *start = buf + (pos - (at - len));
 765                                 cnt = at - pos;
 766                         } else
 767                                 cnt += len;
 768                         buf += len;
 769                 }
 770                 ec = ec->next;
 771         }
 772         return (count > cnt) ? cnt : count;
 773 }
 774
 775 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 776
 777 static void ecard_proc_init(void)
 778 {
 779         proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
 780         create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
 781                 get_ecard_dev_info);
 782 }
 783
 784 #define ec_set_resource(ec,nr,st,sz)                            \
 785         do {                                                    \
 786                 (ec)->resource[nr].name = ec->dev.bus_id;       \
 787                 (ec)->resource[nr].start = st;                  \
 788                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 789                 (ec)->resource[nr].flags = IORESOURCE_MEM;      \
 790         } while (0)
 791
 792 static void __init ecard_free_card(struct expansion_card *ec)
 793 {
 794         int i;
 795
 796         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 797                 if (ec->resource[i].flags)
 798                         release_resource(&ec->resource[i]);
 799
 800         kfree(ec);
 801 }
 802
 803 static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 804 {
 805         struct expansion_card *ec;
 806         unsigned long base;
 807         int i;
 808
 809         ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
 810         if (!ec) {
 811                 ec = ERR_PTR(-ENOMEM);
 812                 goto nomem;
 813         }
 814
 815         ec->slot_no = slot;
 816         ec->type = type;
 817         ec->irq = NO_IRQ;
 818         ec->fiq = NO_IRQ;
 819         ec->dma = NO_DMA;
 820         ec->ops = &ecard_default_ops;
 821
 822         snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
 823         ec->dev.parent = NULL;
 824         ec->dev.bus = &ecard_bus_type;
 825         ec->dev.dma_mask = &ec->dma_mask;
 826         ec->dma_mask = (u64)0xffffffff;
 827
 828         if (slot < 4) {
 829                 ec_set_resource(ec, ECARD_RES_MEMC,
 830                                 PODSLOT_MEMC_BASE + (slot << 14),
 831                                 PODSLOT_MEMC_SIZE);
 832                 base = PODSLOT_IOC0_BASE + (slot << 14);
 833         } else
 834                 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
 835
 836 #ifdef CONFIG_ARCH_RPC
 837         if (slot < 8) {
 838                 ec_set_resource(ec, ECARD_RES_EASI,
 839                                 PODSLOT_EASI_BASE + (slot << 24),
 840                                 PODSLOT_EASI_SIZE);
 841         }
 842
 843         if (slot == 8) {
 844                 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
 845         } else
 846 #endif
 847
 848         for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
 849                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 850                                 base + (i << 19), PODSLOT_IOC_SIZE);
 851
 852         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 853                 if (ec->resource[i].flags &&
 854                     request_resource(&iomem_resource, &ec->resource[i])) {
 855                         printk(KERN_ERR "%s: resource(s) not available\n",
 856                                 ec->dev.bus_id);
 857                         ec->resource[i].end -= ec->resource[i].start;
 858                         ec->resource[i].start = 0;
 859                         ec->resource[i].flags = 0;
 860                 }
 861         }
 862
 863  nomem:
 864         return ec;
 865 }
 866
 867 static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf)
 868 {
 869         struct expansion_card *ec = ECARD_DEV(dev);
 870         return sprintf(buf, "%u\n", ec->irq);
 871 }
 872
 873 static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
 874 {
 875         struct expansion_card *ec = ECARD_DEV(dev);
 876         return sprintf(buf, "%u\n", ec->dma);
 877 }
 878
 879 static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
 880 {
 881         struct expansion_card *ec = ECARD_DEV(dev);
 882         char *str = buf;
 883         int i;
 884
 885         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 886                 str += sprintf(str, "%08lx %08lx %08lx\n",
 887                                 ec->resource[i].start,
 888                                 ec->resource[i].end,
 889                                 ec->resource[i].flags);
 890
 891         return str - buf;
 892 }
 893
 894 static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf)
 895 {
 896         struct expansion_card *ec = ECARD_DEV(dev);
 897         return sprintf(buf, "%u\n", ec->cid.manufacturer);
 898 }
 899
 900 static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
 901 {
 902         struct expansion_card *ec = ECARD_DEV(dev);
 903         return sprintf(buf, "%u\n", ec->cid.product);
 904 }
 905
 906 static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
 907 {
 908         struct expansion_card *ec = ECARD_DEV(dev);
 909         return sprintf(buf, "%s\n", ec->type == ECARD_EASI ? "EASI" : "IOC");
 910 }
 911
 912 static struct device_attribute ecard_dev_attrs[] = {
 913         __ATTR(device,   S_IRUGO, ecard_show_device,    NULL),
 914         __ATTR(dma,      S_IRUGO, ecard_show_dma,       NULL),
 915         __ATTR(irq,      S_IRUGO, ecard_show_irq,       NULL),
 916         __ATTR(resource, S_IRUGO, ecard_show_resources, NULL),
 917         __ATTR(type,     S_IRUGO, ecard_show_type,      NULL),
 918         __ATTR(vendor,   S_IRUGO, ecard_show_vendor,    NULL),
 919         __ATTR_NULL,
 920 };
 921
 922
 923 int ecard_request_resources(struct expansion_card *ec)
 924 {
 925         int i, err = 0;
 926
 927         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 928                 if (ecard_resource_end(ec, i) &&
 929                     !request_mem_region(ecard_resource_start(ec, i),
 930                                         ecard_resource_len(ec, i),
 931                                         ec->dev.driver->name)) {
 932                         err = -EBUSY;
 933                         break;
 934                 }
 935         }
 936
 937         if (err) {
 938                 while (i--)
 939                         if (ecard_resource_end(ec, i))
 940                                 release_mem_region(ecard_resource_start(ec, i),
 941                                                    ecard_resource_len(ec, i));
 942         }
 943         return err;
 944 }
 945 EXPORT_SYMBOL(ecard_request_resources);
 946
 947 void ecard_release_resources(struct expansion_card *ec)
 948 {
 949         int i;
 950
 951         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 952                 if (ecard_resource_end(ec, i))
 953                         release_mem_region(ecard_resource_start(ec, i),
 954                                            ecard_resource_len(ec, i));
 955 }
 956 EXPORT_SYMBOL(ecard_release_resources);
 957
 958 /*
 959  * Probe for an expansion card.
 960  *
 961  * If bit 1 of the first byte of the card is set, then the
 962  * card does not exist.
 963  */
 964 static int __init
 965 ecard_probe(int slot, card_type_t type)
 966 {
 967         ecard_t **ecp;
 968         ecard_t *ec;
 969         struct ex_ecid cid;
 970         int i, rc;
 971
 972         ec = ecard_alloc_card(type, slot);
 973         if (IS_ERR(ec)) {
 974                 rc = PTR_ERR(ec);
 975                 goto nomem;
 976         }
 977
 978         rc = -ENODEV;
 979         if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
 980                 goto nodev;
 981
 982         cid.r_zero = 1;
 983         ecard_readbytes(&cid, ec, 0, 16, 0);
 984         if (cid.r_zero)
 985                 goto nodev;
 986
 987         ec->cid.id      = cid.r_id;
 988         ec->cid.cd      = cid.r_cd;
 989         ec->cid.is      = cid.r_is;
 990         ec->cid.w       = cid.r_w;
 991         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
 992         ec->cid.product = ecard_getu16(cid.r_prod);
 993         ec->cid.country = cid.r_country;
 994         ec->cid.irqmask = cid.r_irqmask;
 995         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
 996         ec->cid.fiqmask = cid.r_fiqmask;
 997         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
 998         ec->fiqaddr     =
 999         ec->irqaddr     = (void __iomem *)ioaddr(ec->podaddr);
1000
1001         if (ec->cid.is) {
1002                 ec->irqmask = ec->cid.irqmask;
1003                 ec->irqaddr += ec->cid.irqoff;
1004                 ec->fiqmask = ec->cid.fiqmask;
1005                 ec->fiqaddr += ec->cid.fiqoff;
1006         } else {
1007                 ec->irqmask = 1;
1008                 ec->fiqmask = 4;
1009         }
1010
1011         for (i = 0; i < sizeof(blacklist) / sizeof(*blacklist); i++)
1012                 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
1013                     blacklist[i].product == ec->cid.product) {
1014                         ec->card_desc = blacklist[i].type;
1015                         break;
1016                 }
1017
1018         /*
1019          * hook the interrupt handlers
1020          */
1021         if (slot < 8) {
1022                 ec->irq = 32 + slot;
1023                 set_irq_chip(ec->irq, &ecard_chip);
1024                 set_irq_handler(ec->irq, do_level_IRQ);
1025                 set_irq_flags(ec->irq, IRQF_VALID);
1026         }
1027
1028 #ifdef IO_EC_MEMC8_BASE
1029         if (slot == 8)
1030                 ec->irq = 11;
1031 #endif
1032 #ifdef CONFIG_ARCH_RPC
1033         /* On RiscPC, only first two slots have DMA capability */
1034         if (slot < 2)
1035                 ec->dma = 2 + slot;
1036 #endif
1037
1038         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
1039
1040         *ecp = ec;
1041         slot_to_expcard[slot] = ec;
1042
1043         device_register(&ec->dev);
1044
1045         return 0;
1046
1047  nodev:
1048         ecard_free_card(ec);
1049  nomem:
1050         return rc;
1051 }
1052
1053 /*
1054  * Initialise the expansion card system.
1055  * Locate all hardware - interrupt management and
1056  * actual cards.
1057  */
1058 static int __init ecard_init(void)
1059 {
1060         int slot, irqhw, ret;
1061
1062         ret = kernel_thread(ecard_task, NULL, CLONE_KERNEL);
1063         if (ret < 0) {
1064                 printk(KERN_ERR "Ecard: unable to create kernel thread: %d\n",
1065                        ret);
1066                 return ret;
1067         }
1068
1069         printk("Probing expansion cards\n");
1070
1071         for (slot = 0; slot < 8; slot ++) {
1072                 if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
1073                         ecard_probe(slot, ECARD_IOC);
1074         }
1075
1076 #ifdef IO_EC_MEMC8_BASE
1077         ecard_probe(8, ECARD_IOC);
1078 #endif
1079
1080         irqhw = ecard_probeirqhw();
1081
1082         set_irq_chained_handler(IRQ_EXPANSIONCARD,
1083                                 irqhw ? ecard_irqexp_handler : ecard_irq_handler);
1084
1085         ecard_proc_init();
1086
1087         return 0;
1088 }
1089
1090 subsys_initcall(ecard_init);
1091
1092 /*
1093  *      ECARD "bus"
1094  */
1095 static const struct ecard_id *
1096 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1097 {
1098         int i;
1099
1100         for (i = 0; ids[i].manufacturer != 65535; i++)
1101                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1102                     ec->cid.product == ids[i].product)
1103                         return ids + i;
1104
1105         return NULL;
1106 }
1107
1108 static int ecard_drv_probe(struct device *dev)
1109 {
1110         struct expansion_card *ec = ECARD_DEV(dev);
1111         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1112         const struct ecard_id *id;
1113         int ret;
1114
1115         id = ecard_match_device(drv->id_table, ec);
1116
1117         ecard_claim(ec);
1118         ret = drv->probe(ec, id);
1119         if (ret)
1120                 ecard_release(ec);
1121         return ret;
1122 }
1123
1124 static int ecard_drv_remove(struct device *dev)
1125 {
1126         struct expansion_card *ec = ECARD_DEV(dev);
1127         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1128
1129         drv->remove(ec);
1130         ecard_release(ec);
1131
1132         return 0;
1133 }
1134
1135 /*
1136  * Before rebooting, we must make sure that the expansion card is in a
1137  * sensible state, so it can be re-detected.  This means that the first
1138  * page of the ROM must be visible.  We call the expansion cards reset
1139  * handler, if any.
1140  */
1141 static void ecard_drv_shutdown(struct device *dev)
1142 {
1143         struct expansion_card *ec = ECARD_DEV(dev);
1144         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1145         struct ecard_request req;
1146
1147         if (dev->driver) {
1148                 if (drv->shutdown)
1149                         drv->shutdown(ec);
1150                 ecard_release(ec);
1151         }
1152
1153         /*
1154          * If this card has a loader, call the reset handler.
1155          */
1156         if (ec->loader) {
1157                 req.fn = ecard_task_reset;
1158                 req.ec = ec;
1159                 ecard_call(&req);
1160         }
1161 }
1162
1163 int ecard_register_driver(struct ecard_driver *drv)
1164 {
1165         drv->drv.bus = &ecard_bus_type;
1166
1167         return driver_register(&drv->drv);
1168 }
1169
1170 void ecard_remove_driver(struct ecard_driver *drv)
1171 {
1172         driver_unregister(&drv->drv);
1173 }
1174
1175 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1176 {
1177         struct expansion_card *ec = ECARD_DEV(_dev);
1178         struct ecard_driver *drv = ECARD_DRV(_drv);
1179         int ret;
1180
1181         if (drv->id_table) {
1182                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1183         } else {
1184                 ret = ec->cid.id == drv->id;
1185         }
1186
1187         return ret;
1188 }
1189
1190 struct bus_type ecard_bus_type = {
1191         .name           = "ecard",
1192         .dev_attrs      = ecard_dev_attrs,
1193         .match          = ecard_match,
1194         .probe          = ecard_drv_probe,
1195         .remove         = ecard_drv_remove,
1196         .shutdown       = ecard_drv_shutdown,
1197 };
1198
1199 static int ecard_bus_init(void)
1200 {
1201         return bus_register(&ecard_bus_type);
1202 }
1203
1204 postcore_initcall(ecard_bus_init);
1205
1206 EXPORT_SYMBOL(ecard_readchunk);
1207 EXPORT_SYMBOL(__ecard_address);
1208 EXPORT_SYMBOL(ecard_register_driver);
1209 EXPORT_SYMBOL(ecard_remove_driver);
1210 EXPORT_SYMBOL(ecard_bus_type);