git.oblomov.eu Git - linux-2.6/blob - 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_ONSTACK(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 = 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 irq_chip ecard_chip = {
 474         .name   = "ECARD",
 475         .ack    = ecard_irq_mask,
 476         .mask   = ecard_irq_mask,
 477         .unmask = ecard_irq_unmask,
 478 };
 479
 480 void ecard_enablefiq(unsigned int fiqnr)
 481 {
 482         ecard_t *ec = slot_to_ecard(fiqnr);
 483
 484         if (ec) {
 485                 if (!ec->ops)
 486                         ec->ops = &ecard_default_ops;
 487
 488                 if (ec->claimed && ec->ops->fiqenable)
 489                         ec->ops->fiqenable(ec, fiqnr);
 490                 else
 491                         printk(KERN_ERR "ecard: rejecting request to "
 492                                 "enable FIQs for %d\n", fiqnr);
 493         }
 494 }
 495
 496 void ecard_disablefiq(unsigned int fiqnr)
 497 {
 498         ecard_t *ec = slot_to_ecard(fiqnr);
 499
 500         if (ec) {
 501                 if (!ec->ops)
 502                         ec->ops = &ecard_default_ops;
 503
 504                 if (ec->ops->fiqdisable)
 505                         ec->ops->fiqdisable(ec, fiqnr);
 506         }
 507 }
 508
 509 static void ecard_dump_irq_state(void)
 510 {
 511         ecard_t *ec;
 512
 513         printk("Expansion card IRQ state:\n");
 514
 515         for (ec = cards; ec; ec = ec->next) {
 516                 if (ec->slot_no == 8)
 517                         continue;
 518
 519                 printk("  %d: %sclaimed, ",
 520                        ec->slot_no, ec->claimed ? "" : "not ");
 521
 522                 if (ec->ops && ec->ops->irqpending &&
 523                     ec->ops != &ecard_default_ops)
 524                         printk("irq %spending\n",
 525                                ec->ops->irqpending(ec) ? "" : "not ");
 526                 else
 527                         printk("irqaddr %p, mask = %02X, status = %02X\n",
 528                                ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
 529         }
 530 }
 531
 532 static void ecard_check_lockup(struct irq_desc *desc)
 533 {
 534         static unsigned long last;
 535         static int lockup;
 536
 537         /*
 538          * If the timer interrupt has not run since the last million
 539          * unrecognised expansion card interrupts, then there is
 540          * something seriously wrong.  Disable the expansion card
 541          * interrupts so at least we can continue.
 542          *
 543          * Maybe we ought to start a timer to re-enable them some time
 544          * later?
 545          */
 546         if (last == jiffies) {
 547                 lockup += 1;
 548                 if (lockup > 1000000) {
 549                         printk(KERN_ERR "\nInterrupt lockup detected - "
 550                                "disabling all expansion card interrupts\n");
 551
 552                         desc->chip->mask(IRQ_EXPANSIONCARD);
 553                         ecard_dump_irq_state();
 554                 }
 555         } else
 556                 lockup = 0;
 557
 558         /*
 559          * If we did not recognise the source of this interrupt,
 560          * warn the user, but don't flood the user with these messages.
 561          */
 562         if (!last || time_after(jiffies, last + 5*HZ)) {
 563                 last = jiffies;
 564                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 565                 ecard_dump_irq_state();
 566         }
 567 }
 568
 569 static void
 570 ecard_irq_handler(unsigned int irq, struct irq_desc *desc)
 571 {
 572         ecard_t *ec;
 573         int called = 0;
 574
 575         desc->chip->mask(irq);
 576         for (ec = cards; ec; ec = ec->next) {
 577                 int pending;
 578
 579                 if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
 580                         continue;
 581
 582                 if (ec->ops && ec->ops->irqpending)
 583                         pending = ec->ops->irqpending(ec);
 584                 else
 585                         pending = ecard_default_ops.irqpending(ec);
 586
 587                 if (pending) {
 588                         struct irq_desc *d = irq_desc + ec->irq;
 589                         desc_handle_irq(ec->irq, d);
 590                         called ++;
 591                 }
 592         }
 593         desc->chip->unmask(irq);
 594
 595         if (called == 0)
 596                 ecard_check_lockup(desc);
 597 }
 598
 599 #ifdef HAS_EXPMASK
 600 static unsigned char priority_masks[] =
 601 {
 602         0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
 603 };
 604
 605 static unsigned char first_set[] =
 606 {
 607         0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
 608         0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
 609 };
 610
 611 static void
 612 ecard_irqexp_handler(unsigned int irq, struct irq_desc *desc)
 613 {
 614         const unsigned int statusmask = 15;
 615         unsigned int status;
 616
 617         status = __raw_readb(EXPMASK_STATUS) & statusmask;
 618         if (status) {
 619                 unsigned int slot = first_set[status];
 620                 ecard_t *ec = slot_to_ecard(slot);
 621
 622                 if (ec->claimed) {
 623                         struct irq_desc *d = irq_desc + ec->irq;
 624                         /*
 625                          * this ugly code is so that we can operate a
 626                          * prioritorising system:
 627                          *
 628                          * Card 0       highest priority
 629                          * Card 1
 630                          * Card 2
 631                          * Card 3       lowest priority
 632                          *
 633                          * Serial cards should go in 0/1, ethernet/scsi in 2/3
 634                          * otherwise you will lose serial data at high speeds!
 635                          */
 636                         desc_handle_irq(ec->irq, d);
 637                 } else {
 638                         printk(KERN_WARNING "card%d: interrupt from unclaimed "
 639                                "card???\n", slot);
 640                         have_expmask &= ~(1 << slot);
 641                         __raw_writeb(have_expmask, EXPMASK_ENABLE);
 642                 }
 643         } else
 644                 printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
 645 }
 646
 647 static int __init ecard_probeirqhw(void)
 648 {
 649         ecard_t *ec;
 650         int found;
 651
 652         __raw_writeb(0x00, EXPMASK_ENABLE);
 653         __raw_writeb(0xff, EXPMASK_STATUS);
 654         found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
 655         __raw_writeb(0xff, EXPMASK_ENABLE);
 656
 657         if (found) {
 658                 printk(KERN_DEBUG "Expansion card interrupt "
 659                        "management hardware found\n");
 660
 661                 /* for each card present, set a bit to '1' */
 662                 have_expmask = 0x80000000;
 663
 664                 for (ec = cards; ec; ec = ec->next)
 665                         have_expmask |= 1 << ec->slot_no;
 666
 667                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 668         }
 669
 670         return found;
 671 }
 672 #else
 673 #define ecard_irqexp_handler NULL
 674 #define ecard_probeirqhw() (0)
 675 #endif
 676
 677 #ifndef IO_EC_MEMC8_BASE
 678 #define IO_EC_MEMC8_BASE 0
 679 #endif
 680
 681 unsigned int __ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 682 {
 683         unsigned long address = 0;
 684         int slot = ec->slot_no;
 685
 686         if (ec->slot_no == 8)
 687                 return IO_EC_MEMC8_BASE;
 688
 689         ectcr &= ~(1 << slot);
 690
 691         switch (type) {
 692         case ECARD_MEMC:
 693                 if (slot < 4)
 694                         address = IO_EC_MEMC_BASE + (slot << 12);
 695                 break;
 696
 697         case ECARD_IOC:
 698                 if (slot < 4)
 699                         address = IO_EC_IOC_BASE + (slot << 12);
 700 #ifdef IO_EC_IOC4_BASE
 701                 else
 702                         address = IO_EC_IOC4_BASE + ((slot - 4) << 12);
 703 #endif
 704                 if (address)
 705                         address +=  speed << 17;
 706                 break;
 707
 708 #ifdef IO_EC_EASI_BASE
 709         case ECARD_EASI:
 710                 address = IO_EC_EASI_BASE + (slot << 22);
 711                 if (speed == ECARD_FAST)
 712                         ectcr |= 1 << slot;
 713                 break;
 714 #endif
 715         default:
 716                 break;
 717         }
 718
 719 #ifdef IOMD_ECTCR
 720         iomd_writeb(ectcr, IOMD_ECTCR);
 721 #endif
 722         return address;
 723 }
 724
 725 static int ecard_prints(char *buffer, ecard_t *ec)
 726 {
 727         char *start = buffer;
 728
 729         buffer += sprintf(buffer, "  %d: %s ", ec->slot_no,
 730                           ec->type == ECARD_EASI ? "EASI" : "    ");
 731
 732         if (ec->cid.id == 0) {
 733                 struct in_chunk_dir incd;
 734
 735                 buffer += sprintf(buffer, "[%04X:%04X] ",
 736                         ec->cid.manufacturer, ec->cid.product);
 737
 738                 if (!ec->card_desc && ec->cid.cd &&
 739                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 740                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 741
 742                         if (ec->card_desc)
 743                                 strcpy((char *)ec->card_desc, incd.d.string);
 744                 }
 745
 746                 buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 747         } else
 748                 buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);
 749
 750         return buffer - start;
 751 }
 752
 753 static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
 754 {
 755         ecard_t *ec = cards;
 756         off_t at = 0;
 757         int len, cnt;
 758
 759         cnt = 0;
 760         while (ec && count > cnt) {
 761                 len = ecard_prints(buf, ec);
 762                 at += len;
 763                 if (at >= pos) {
 764                         if (!*start) {
 765                                 *start = buf + (pos - (at - len));
 766                                 cnt = at - pos;
 767                         } else
 768                                 cnt += len;
 769                         buf += len;
 770                 }
 771                 ec = ec->next;
 772         }
 773         return (count > cnt) ? cnt : count;
 774 }
 775
 776 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 777
 778 static void ecard_proc_init(void)
 779 {
 780         proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
 781         create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
 782                 get_ecard_dev_info);
 783 }
 784
 785 #define ec_set_resource(ec,nr,st,sz)                            \
 786         do {                                                    \
 787                 (ec)->resource[nr].name = ec->dev.bus_id;       \
 788                 (ec)->resource[nr].start = st;                  \
 789                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 790                 (ec)->resource[nr].flags = IORESOURCE_MEM;      \
 791         } while (0)
 792
 793 static void __init ecard_free_card(struct expansion_card *ec)
 794 {
 795         int i;
 796
 797         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 798                 if (ec->resource[i].flags)
 799                         release_resource(&ec->resource[i]);
 800
 801         kfree(ec);
 802 }
 803
 804 static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 805 {
 806         struct expansion_card *ec;
 807         unsigned long base;
 808         int i;
 809
 810         ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
 811         if (!ec) {
 812                 ec = ERR_PTR(-ENOMEM);
 813                 goto nomem;
 814         }
 815
 816         ec->slot_no = slot;
 817         ec->type = type;
 818         ec->irq = NO_IRQ;
 819         ec->fiq = NO_IRQ;
 820         ec->dma = NO_DMA;
 821         ec->ops = &ecard_default_ops;
 822
 823         snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
 824         ec->dev.parent = NULL;
 825         ec->dev.bus = &ecard_bus_type;
 826         ec->dev.dma_mask = &ec->dma_mask;
 827         ec->dma_mask = (u64)0xffffffff;
 828
 829         if (slot < 4) {
 830                 ec_set_resource(ec, ECARD_RES_MEMC,
 831                                 PODSLOT_MEMC_BASE + (slot << 14),
 832                                 PODSLOT_MEMC_SIZE);
 833                 base = PODSLOT_IOC0_BASE + (slot << 14);
 834         } else
 835                 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
 836
 837 #ifdef CONFIG_ARCH_RPC
 838         if (slot < 8) {
 839                 ec_set_resource(ec, ECARD_RES_EASI,
 840                                 PODSLOT_EASI_BASE + (slot << 24),
 841                                 PODSLOT_EASI_SIZE);
 842         }
 843
 844         if (slot == 8) {
 845                 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
 846         } else
 847 #endif
 848
 849         for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
 850                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 851                                 base + (i << 19), PODSLOT_IOC_SIZE);
 852
 853         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 854                 if (ec->resource[i].flags &&
 855                     request_resource(&iomem_resource, &ec->resource[i])) {
 856                         printk(KERN_ERR "%s: resource(s) not available\n",
 857                                 ec->dev.bus_id);
 858                         ec->resource[i].end -= ec->resource[i].start;
 859                         ec->resource[i].start = 0;
 860                         ec->resource[i].flags = 0;
 861                 }
 862         }
 863
 864  nomem:
 865         return ec;
 866 }
 867
 868 static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf)
 869 {
 870         struct expansion_card *ec = ECARD_DEV(dev);
 871         return sprintf(buf, "%u\n", ec->irq);
 872 }
 873
 874 static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
 875 {
 876         struct expansion_card *ec = ECARD_DEV(dev);
 877         return sprintf(buf, "%u\n", ec->dma);
 878 }
 879
 880 static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
 881 {
 882         struct expansion_card *ec = ECARD_DEV(dev);
 883         char *str = buf;
 884         int i;
 885
 886         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 887                 str += sprintf(str, "%08x %08x %08lx\n",
 888                                 ec->resource[i].start,
 889                                 ec->resource[i].end,
 890                                 ec->resource[i].flags);
 891
 892         return str - buf;
 893 }
 894
 895 static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf)
 896 {
 897         struct expansion_card *ec = ECARD_DEV(dev);
 898         return sprintf(buf, "%u\n", ec->cid.manufacturer);
 899 }
 900
 901 static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
 902 {
 903         struct expansion_card *ec = ECARD_DEV(dev);
 904         return sprintf(buf, "%u\n", ec->cid.product);
 905 }
 906
 907 static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
 908 {
 909         struct expansion_card *ec = ECARD_DEV(dev);
 910         return sprintf(buf, "%s\n", ec->type == ECARD_EASI ? "EASI" : "IOC");
 911 }
 912
 913 static struct device_attribute ecard_dev_attrs[] = {
 914         __ATTR(device,   S_IRUGO, ecard_show_device,    NULL),
 915         __ATTR(dma,      S_IRUGO, ecard_show_dma,       NULL),
 916         __ATTR(irq,      S_IRUGO, ecard_show_irq,       NULL),
 917         __ATTR(resource, S_IRUGO, ecard_show_resources, NULL),
 918         __ATTR(type,     S_IRUGO, ecard_show_type,      NULL),
 919         __ATTR(vendor,   S_IRUGO, ecard_show_vendor,    NULL),
 920         __ATTR_NULL,
 921 };
 922
 923
 924 int ecard_request_resources(struct expansion_card *ec)
 925 {
 926         int i, err = 0;
 927
 928         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 929                 if (ecard_resource_end(ec, i) &&
 930                     !request_mem_region(ecard_resource_start(ec, i),
 931                                         ecard_resource_len(ec, i),
 932                                         ec->dev.driver->name)) {
 933                         err = -EBUSY;
 934                         break;
 935                 }
 936         }
 937
 938         if (err) {
 939                 while (i--)
 940                         if (ecard_resource_end(ec, i))
 941                                 release_mem_region(ecard_resource_start(ec, i),
 942                                                    ecard_resource_len(ec, i));
 943         }
 944         return err;
 945 }
 946 EXPORT_SYMBOL(ecard_request_resources);
 947
 948 void ecard_release_resources(struct expansion_card *ec)
 949 {
 950         int i;
 951
 952         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 953                 if (ecard_resource_end(ec, i))
 954                         release_mem_region(ecard_resource_start(ec, i),
 955                                            ecard_resource_len(ec, i));
 956 }
 957 EXPORT_SYMBOL(ecard_release_resources);
 958
 959 /*
 960  * Probe for an expansion card.
 961  *
 962  * If bit 1 of the first byte of the card is set, then the
 963  * card does not exist.
 964  */
 965 static int __init
 966 ecard_probe(int slot, card_type_t type)
 967 {
 968         ecard_t **ecp;
 969         ecard_t *ec;
 970         struct ex_ecid cid;
 971         int i, rc;
 972
 973         ec = ecard_alloc_card(type, slot);
 974         if (IS_ERR(ec)) {
 975                 rc = PTR_ERR(ec);
 976                 goto nomem;
 977         }
 978
 979         rc = -ENODEV;
 980         if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
 981                 goto nodev;
 982
 983         cid.r_zero = 1;
 984         ecard_readbytes(&cid, ec, 0, 16, 0);
 985         if (cid.r_zero)
 986                 goto nodev;
 987
 988         ec->cid.id      = cid.r_id;
 989         ec->cid.cd      = cid.r_cd;
 990         ec->cid.is      = cid.r_is;
 991         ec->cid.w       = cid.r_w;
 992         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
 993         ec->cid.product = ecard_getu16(cid.r_prod);
 994         ec->cid.country = cid.r_country;
 995         ec->cid.irqmask = cid.r_irqmask;
 996         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
 997         ec->cid.fiqmask = cid.r_fiqmask;
 998         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
 999         ec->fiqaddr     =
1000         ec->irqaddr     = (void __iomem *)ioaddr(ec->podaddr);
1001
1002         if (ec->cid.is) {
1003                 ec->irqmask = ec->cid.irqmask;
1004                 ec->irqaddr += ec->cid.irqoff;
1005                 ec->fiqmask = ec->cid.fiqmask;
1006                 ec->fiqaddr += ec->cid.fiqoff;
1007         } else {
1008                 ec->irqmask = 1;
1009                 ec->fiqmask = 4;
1010         }
1011
1012         for (i = 0; i < ARRAY_SIZE(blacklist); i++)
1013                 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
1014                     blacklist[i].product == ec->cid.product) {
1015                         ec->card_desc = blacklist[i].type;
1016                         break;
1017                 }
1018
1019         /*
1020          * hook the interrupt handlers
1021          */
1022         if (slot < 8) {
1023                 ec->irq = 32 + slot;
1024                 set_irq_chip(ec->irq, &ecard_chip);
1025                 set_irq_handler(ec->irq, handle_level_irq);
1026                 set_irq_flags(ec->irq, IRQF_VALID);
1027         }
1028
1029 #ifdef IO_EC_MEMC8_BASE
1030         if (slot == 8)
1031                 ec->irq = 11;
1032 #endif
1033 #ifdef CONFIG_ARCH_RPC
1034         /* On RiscPC, only first two slots have DMA capability */
1035         if (slot < 2)
1036                 ec->dma = 2 + slot;
1037 #endif
1038
1039         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
1040
1041         *ecp = ec;
1042         slot_to_expcard[slot] = ec;
1043
1044         device_register(&ec->dev);
1045
1046         return 0;
1047
1048  nodev:
1049         ecard_free_card(ec);
1050  nomem:
1051         return rc;
1052 }
1053
1054 /*
1055  * Initialise the expansion card system.
1056  * Locate all hardware - interrupt management and
1057  * actual cards.
1058  */
1059 static int __init ecard_init(void)
1060 {
1061         int slot, irqhw, ret;
1062
1063         ret = kernel_thread(ecard_task, NULL, CLONE_KERNEL);
1064         if (ret < 0) {
1065                 printk(KERN_ERR "Ecard: unable to create kernel thread: %d\n",
1066                        ret);
1067                 return ret;
1068         }
1069
1070         printk("Probing expansion cards\n");
1071
1072         for (slot = 0; slot < 8; slot ++) {
1073                 if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
1074                         ecard_probe(slot, ECARD_IOC);
1075         }
1076
1077 #ifdef IO_EC_MEMC8_BASE
1078         ecard_probe(8, ECARD_IOC);
1079 #endif
1080
1081         irqhw = ecard_probeirqhw();
1082
1083         set_irq_chained_handler(IRQ_EXPANSIONCARD,
1084                                 irqhw ? ecard_irqexp_handler : ecard_irq_handler);
1085
1086         ecard_proc_init();
1087
1088         return 0;
1089 }
1090
1091 subsys_initcall(ecard_init);
1092
1093 /*
1094  *      ECARD "bus"
1095  */
1096 static const struct ecard_id *
1097 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1098 {
1099         int i;
1100
1101         for (i = 0; ids[i].manufacturer != 65535; i++)
1102                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1103                     ec->cid.product == ids[i].product)
1104                         return ids + i;
1105
1106         return NULL;
1107 }
1108
1109 static int ecard_drv_probe(struct device *dev)
1110 {
1111         struct expansion_card *ec = ECARD_DEV(dev);
1112         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1113         const struct ecard_id *id;
1114         int ret;
1115
1116         id = ecard_match_device(drv->id_table, ec);
1117
1118         ecard_claim(ec);
1119         ret = drv->probe(ec, id);
1120         if (ret)
1121                 ecard_release(ec);
1122         return ret;
1123 }
1124
1125 static int ecard_drv_remove(struct device *dev)
1126 {
1127         struct expansion_card *ec = ECARD_DEV(dev);
1128         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1129
1130         drv->remove(ec);
1131         ecard_release(ec);
1132
1133         return 0;
1134 }
1135
1136 /*
1137  * Before rebooting, we must make sure that the expansion card is in a
1138  * sensible state, so it can be re-detected.  This means that the first
1139  * page of the ROM must be visible.  We call the expansion cards reset
1140  * handler, if any.
1141  */
1142 static void ecard_drv_shutdown(struct device *dev)
1143 {
1144         struct expansion_card *ec = ECARD_DEV(dev);
1145         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1146         struct ecard_request req;
1147
1148         if (dev->driver) {
1149                 if (drv->shutdown)
1150                         drv->shutdown(ec);
1151                 ecard_release(ec);
1152         }
1153
1154         /*
1155          * If this card has a loader, call the reset handler.
1156          */
1157         if (ec->loader) {
1158                 req.fn = ecard_task_reset;
1159                 req.ec = ec;
1160                 ecard_call(&req);
1161         }
1162 }
1163
1164 int ecard_register_driver(struct ecard_driver *drv)
1165 {
1166         drv->drv.bus = &ecard_bus_type;
1167
1168         return driver_register(&drv->drv);
1169 }
1170
1171 void ecard_remove_driver(struct ecard_driver *drv)
1172 {
1173         driver_unregister(&drv->drv);
1174 }
1175
1176 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1177 {
1178         struct expansion_card *ec = ECARD_DEV(_dev);
1179         struct ecard_driver *drv = ECARD_DRV(_drv);
1180         int ret;
1181
1182         if (drv->id_table) {
1183                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1184         } else {
1185                 ret = ec->cid.id == drv->id;
1186         }
1187
1188         return ret;
1189 }
1190
1191 struct bus_type ecard_bus_type = {
1192         .name           = "ecard",
1193         .dev_attrs      = ecard_dev_attrs,
1194         .match          = ecard_match,
1195         .probe          = ecard_drv_probe,
1196         .remove         = ecard_drv_remove,
1197         .shutdown       = ecard_drv_shutdown,
1198 };
1199
1200 static int ecard_bus_init(void)
1201 {
1202         return bus_register(&ecard_bus_type);
1203 }
1204
1205 postcore_initcall(ecard_bus_init);
1206
1207 EXPORT_SYMBOL(ecard_readchunk);
1208 EXPORT_SYMBOL(__ecard_address);
1209 EXPORT_SYMBOL(ecard_register_driver);
1210 EXPORT_SYMBOL(ecard_remove_driver);
1211 EXPORT_SYMBOL(ecard_bus_type);