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/seq_file.h>
  41 #include <linux/device.h>
  42 #include <linux/init.h>
  43 #include <linux/mutex.h>
  44 #include <linux/kthread.h>
  45 #include <linux/io.h>
  46
  47 #include <asm/dma.h>
  48 #include <asm/ecard.h>
  49 #include <mach/hardware.h>
  50 #include <asm/irq.h>
  51 #include <asm/mmu_context.h>
  52 #include <asm/mach/irq.h>
  53 #include <asm/tlbflush.h>
  54
  55 #include "ecard.h"
  56
  57 #ifndef CONFIG_ARCH_RPC
  58 #define HAVE_EXPMASK
  59 #endif
  60
  61 struct ecard_request {
  62         void            (*fn)(struct ecard_request *);
  63         ecard_t         *ec;
  64         unsigned int    address;
  65         unsigned int    length;
  66         unsigned int    use_loader;
  67         void            *buffer;
  68         struct completion *complete;
  69 };
  70
  71 struct expcard_blacklist {
  72         unsigned short   manufacturer;
  73         unsigned short   product;
  74         const char      *type;
  75 };
  76
  77 static ecard_t *cards;
  78 static ecard_t *slot_to_expcard[MAX_ECARDS];
  79 static unsigned int ectcr;
  80 #ifdef HAS_EXPMASK
  81 static unsigned int have_expmask;
  82 #endif
  83
  84 /* List of descriptions of cards which don't have an extended
  85  * identification, or chunk directories containing a description.
  86  */
  87 static struct expcard_blacklist __initdata blacklist[] = {
  88         { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
  89 };
  90
  91 asmlinkage extern int
  92 ecard_loader_reset(unsigned long base, loader_t loader);
  93 asmlinkage extern int
  94 ecard_loader_read(int off, unsigned long base, loader_t loader);
  95
  96 static inline unsigned short ecard_getu16(unsigned char *v)
  97 {
  98         return v[0] | v[1] << 8;
  99 }
 100
 101 static inline signed long ecard_gets24(unsigned char *v)
 102 {
 103         return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
 104 }
 105
 106 static inline ecard_t *slot_to_ecard(unsigned int slot)
 107 {
 108         return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
 109 }
 110
 111 /* ===================== Expansion card daemon ======================== */
 112 /*
 113  * Since the loader programs on the expansion cards need to be run
 114  * in a specific environment, create a separate task with this
 115  * environment up, and pass requests to this task as and when we
 116  * need to.
 117  *
 118  * This should allow 99% of loaders to be called from Linux.
 119  *
 120  * From a security standpoint, we trust the card vendors.  This
 121  * may be a misplaced trust.
 122  */
 123 static void ecard_task_reset(struct ecard_request *req)
 124 {
 125         struct expansion_card *ec = req->ec;
 126         struct resource *res;
 127
 128         res = ec->slot_no == 8
 129                 ? &ec->resource[ECARD_RES_MEMC]
 130                 : ec->easi
 131                   ? &ec->resource[ECARD_RES_EASI]
 132                   : &ec->resource[ECARD_RES_IOCSYNC];
 133
 134         ecard_loader_reset(res->start, ec->loader);
 135 }
 136
 137 static void ecard_task_readbytes(struct ecard_request *req)
 138 {
 139         struct expansion_card *ec = req->ec;
 140         unsigned char *buf = req->buffer;
 141         unsigned int len = req->length;
 142         unsigned int off = req->address;
 143
 144         if (ec->slot_no == 8) {
 145                 void __iomem *base = (void __iomem *)
 146                                 ec->resource[ECARD_RES_MEMC].start;
 147
 148                 /*
 149                  * The card maintains an index which increments the address
 150                  * into a 4096-byte page on each access.  We need to keep
 151                  * track of the counter.
 152                  */
 153                 static unsigned int index;
 154                 unsigned int page;
 155
 156                 page = (off >> 12) * 4;
 157                 if (page > 256 * 4)
 158                         return;
 159
 160                 off &= 4095;
 161
 162                 /*
 163                  * If we are reading offset 0, or our current index is
 164                  * greater than the offset, reset the hardware index counter.
 165                  */
 166                 if (off == 0 || index > off) {
 167                         writeb(0, base);
 168                         index = 0;
 169                 }
 170
 171                 /*
 172                  * Increment the hardware index counter until we get to the
 173                  * required offset.  The read bytes are discarded.
 174                  */
 175                 while (index < off) {
 176                         readb(base + page);
 177                         index += 1;
 178                 }
 179
 180                 while (len--) {
 181                         *buf++ = readb(base + page);
 182                         index += 1;
 183                 }
 184         } else {
 185                 unsigned long base = (ec->easi
 186                          ? &ec->resource[ECARD_RES_EASI]
 187                          : &ec->resource[ECARD_RES_IOCSYNC])->start;
 188                 void __iomem *pbase = (void __iomem *)base;
 189
 190                 if (!req->use_loader || !ec->loader) {
 191                         off *= 4;
 192                         while (len--) {
 193                                 *buf++ = readb(pbase + off);
 194                                 off += 4;
 195                         }
 196                 } else {
 197                         while(len--) {
 198                                 /*
 199                                  * The following is required by some
 200                                  * expansion card loader programs.
 201                                  */
 202                                 *(unsigned long *)0x108 = 0;
 203                                 *buf++ = ecard_loader_read(off++, base,
 204                                                            ec->loader);
 205                         }
 206                 }
 207         }
 208
 209 }
 210
 211 static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
 212 static struct ecard_request *ecard_req;
 213 static DEFINE_MUTEX(ecard_mutex);
 214
 215 /*
 216  * Set up the expansion card daemon's page tables.
 217  */
 218 static void ecard_init_pgtables(struct mm_struct *mm)
 219 {
 220         struct vm_area_struct vma;
 221
 222         /* We want to set up the page tables for the following mapping:
 223          *  Virtual     Physical
 224          *  0x03000000  0x03000000
 225          *  0x03010000  unmapped
 226          *  0x03210000  0x03210000
 227          *  0x03400000  unmapped
 228          *  0x08000000  0x08000000
 229          *  0x10000000  unmapped
 230          *
 231          * FIXME: we don't follow this 100% yet.
 232          */
 233         pgd_t *src_pgd, *dst_pgd;
 234
 235         src_pgd = pgd_offset(mm, (unsigned long)IO_BASE);
 236         dst_pgd = pgd_offset(mm, IO_START);
 237
 238         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));
 239
 240         src_pgd = pgd_offset(mm, (unsigned long)EASI_BASE);
 241         dst_pgd = pgd_offset(mm, EASI_START);
 242
 243         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));
 244
 245         vma.vm_flags = VM_EXEC;
 246         vma.vm_mm = mm;
 247
 248         flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
 249         flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
 250 }
 251
 252 static int ecard_init_mm(void)
 253 {
 254         struct mm_struct * mm = mm_alloc();
 255         struct mm_struct *active_mm = current->active_mm;
 256
 257         if (!mm)
 258                 return -ENOMEM;
 259
 260         current->mm = mm;
 261         current->active_mm = mm;
 262         activate_mm(active_mm, mm);
 263         mmdrop(active_mm);
 264         ecard_init_pgtables(mm);
 265         return 0;
 266 }
 267
 268 static int
 269 ecard_task(void * unused)
 270 {
 271         /*
 272          * Allocate a mm.  We're not a lazy-TLB kernel task since we need
 273          * to set page table entries where the user space would be.  Note
 274          * that this also creates the page tables.  Failure is not an
 275          * option here.
 276          */
 277         if (ecard_init_mm())
 278                 panic("kecardd: unable to alloc mm\n");
 279
 280         while (1) {
 281                 struct ecard_request *req;
 282
 283                 wait_event_interruptible(ecard_wait, ecard_req != NULL);
 284
 285                 req = xchg(&ecard_req, NULL);
 286                 if (req != NULL) {
 287                         req->fn(req);
 288                         complete(req->complete);
 289                 }
 290         }
 291 }
 292
 293 /*
 294  * Wake the expansion card daemon to action our request.
 295  *
 296  * FIXME: The test here is not sufficient to detect if the
 297  * kcardd is running.
 298  */
 299 static void ecard_call(struct ecard_request *req)
 300 {
 301         DECLARE_COMPLETION_ONSTACK(completion);
 302
 303         req->complete = &completion;
 304
 305         mutex_lock(&ecard_mutex);
 306         ecard_req = req;
 307         wake_up(&ecard_wait);
 308
 309         /*
 310          * Now wait for kecardd to run.
 311          */
 312         wait_for_completion(&completion);
 313         mutex_unlock(&ecard_mutex);
 314 }
 315
 316 /* ======================= Mid-level card control ===================== */
 317
 318 static void
 319 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
 320 {
 321         struct ecard_request req;
 322
 323         req.fn          = ecard_task_readbytes;
 324         req.ec          = ec;
 325         req.address     = off;
 326         req.length      = len;
 327         req.use_loader  = useld;
 328         req.buffer      = addr;
 329
 330         ecard_call(&req);
 331 }
 332
 333 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
 334 {
 335         struct ex_chunk_dir excd;
 336         int index = 16;
 337         int useld = 0;
 338
 339         if (!ec->cid.cd)
 340                 return 0;
 341
 342         while(1) {
 343                 ecard_readbytes(&excd, ec, index, 8, useld);
 344                 index += 8;
 345                 if (c_id(&excd) == 0) {
 346                         if (!useld && ec->loader) {
 347                                 useld = 1;
 348                                 index = 0;
 349                                 continue;
 350                         }
 351                         return 0;
 352                 }
 353                 if (c_id(&excd) == 0xf0) { /* link */
 354                         index = c_start(&excd);
 355                         continue;
 356                 }
 357                 if (c_id(&excd) == 0x80) { /* loader */
 358                         if (!ec->loader) {
 359                                 ec->loader = kmalloc(c_len(&excd),
 360                                                                GFP_KERNEL);
 361                                 if (ec->loader)
 362                                         ecard_readbytes(ec->loader, ec,
 363                                                         (int)c_start(&excd),
 364                                                         c_len(&excd), useld);
 365                                 else
 366                                         return 0;
 367                         }
 368                         continue;
 369                 }
 370                 if (c_id(&excd) == id && num-- == 0)
 371                         break;
 372         }
 373
 374         if (c_id(&excd) & 0x80) {
 375                 switch (c_id(&excd) & 0x70) {
 376                 case 0x70:
 377                         ecard_readbytes((unsigned char *)excd.d.string, ec,
 378                                         (int)c_start(&excd), c_len(&excd),
 379                                         useld);
 380                         break;
 381                 case 0x00:
 382                         break;
 383                 }
 384         }
 385         cd->start_offset = c_start(&excd);
 386         memcpy(cd->d.string, excd.d.string, 256);
 387         return 1;
 388 }
 389
 390 /* ======================= Interrupt control ============================ */
 391
 392 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 393 {
 394 #ifdef HAS_EXPMASK
 395         if (irqnr < 4 && have_expmask) {
 396                 have_expmask |= 1 << irqnr;
 397                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 398         }
 399 #endif
 400 }
 401
 402 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 403 {
 404 #ifdef HAS_EXPMASK
 405         if (irqnr < 4 && have_expmask) {
 406                 have_expmask &= ~(1 << irqnr);
 407                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 408         }
 409 #endif
 410 }
 411
 412 static int ecard_def_irq_pending(ecard_t *ec)
 413 {
 414         return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
 415 }
 416
 417 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 418 {
 419         panic("ecard_def_fiq_enable called - impossible");
 420 }
 421
 422 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 423 {
 424         panic("ecard_def_fiq_disable called - impossible");
 425 }
 426
 427 static int ecard_def_fiq_pending(ecard_t *ec)
 428 {
 429         return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
 430 }
 431
 432 static expansioncard_ops_t ecard_default_ops = {
 433         ecard_def_irq_enable,
 434         ecard_def_irq_disable,
 435         ecard_def_irq_pending,
 436         ecard_def_fiq_enable,
 437         ecard_def_fiq_disable,
 438         ecard_def_fiq_pending
 439 };
 440
 441 /*
 442  * Enable and disable interrupts from expansion cards.
 443  * (interrupts are disabled for these functions).
 444  *
 445  * They are not meant to be called directly, but via enable/disable_irq.
 446  */
 447 static void ecard_irq_unmask(struct irq_data *d)
 448 {
 449         ecard_t *ec = slot_to_ecard(d->irq - 32);
 450
 451         if (ec) {
 452                 if (!ec->ops)
 453                         ec->ops = &ecard_default_ops;
 454
 455                 if (ec->claimed && ec->ops->irqenable)
 456                         ec->ops->irqenable(ec, d->irq);
 457                 else
 458                         printk(KERN_ERR "ecard: rejecting request to "
 459                                 "enable IRQs for %d\n", d->irq);
 460         }
 461 }
 462
 463 static void ecard_irq_mask(struct irq_data *d)
 464 {
 465         ecard_t *ec = slot_to_ecard(d->irq - 32);
 466
 467         if (ec) {
 468                 if (!ec->ops)
 469                         ec->ops = &ecard_default_ops;
 470
 471                 if (ec->ops && ec->ops->irqdisable)
 472                         ec->ops->irqdisable(ec, d->irq);
 473         }
 474 }
 475
 476 static struct irq_chip ecard_chip = {
 477         .name           = "ECARD",
 478         .irq_ack        = ecard_irq_mask,
 479         .irq_mask       = ecard_irq_mask,
 480         .irq_unmask     = ecard_irq_unmask,
 481 };
 482
 483 void ecard_enablefiq(unsigned int fiqnr)
 484 {
 485         ecard_t *ec = slot_to_ecard(fiqnr);
 486
 487         if (ec) {
 488                 if (!ec->ops)
 489                         ec->ops = &ecard_default_ops;
 490
 491                 if (ec->claimed && ec->ops->fiqenable)
 492                         ec->ops->fiqenable(ec, fiqnr);
 493                 else
 494                         printk(KERN_ERR "ecard: rejecting request to "
 495                                 "enable FIQs for %d\n", fiqnr);
 496         }
 497 }
 498
 499 void ecard_disablefiq(unsigned int fiqnr)
 500 {
 501         ecard_t *ec = slot_to_ecard(fiqnr);
 502
 503         if (ec) {
 504                 if (!ec->ops)
 505                         ec->ops = &ecard_default_ops;
 506
 507                 if (ec->ops->fiqdisable)
 508                         ec->ops->fiqdisable(ec, fiqnr);
 509         }
 510 }
 511
 512 static void ecard_dump_irq_state(void)
 513 {
 514         ecard_t *ec;
 515
 516         printk("Expansion card IRQ state:\n");
 517
 518         for (ec = cards; ec; ec = ec->next) {
 519                 if (ec->slot_no == 8)
 520                         continue;
 521
 522                 printk("  %d: %sclaimed, ",
 523                        ec->slot_no, ec->claimed ? "" : "not ");
 524
 525                 if (ec->ops && ec->ops->irqpending &&
 526                     ec->ops != &ecard_default_ops)
 527                         printk("irq %spending\n",
 528                                ec->ops->irqpending(ec) ? "" : "not ");
 529                 else
 530                         printk("irqaddr %p, mask = %02X, status = %02X\n",
 531                                ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
 532         }
 533 }
 534
 535 static void ecard_check_lockup(struct irq_desc *desc)
 536 {
 537         static unsigned long last;
 538         static int lockup;
 539
 540         /*
 541          * If the timer interrupt has not run since the last million
 542          * unrecognised expansion card interrupts, then there is
 543          * something seriously wrong.  Disable the expansion card
 544          * interrupts so at least we can continue.
 545          *
 546          * Maybe we ought to start a timer to re-enable them some time
 547          * later?
 548          */
 549         if (last == jiffies) {
 550                 lockup += 1;
 551                 if (lockup > 1000000) {
 552                         printk(KERN_ERR "\nInterrupt lockup detected - "
 553                                "disabling all expansion card interrupts\n");
 554
 555                         desc->irq_data.chip->irq_mask(&desc->irq_data);
 556                         ecard_dump_irq_state();
 557                 }
 558         } else
 559                 lockup = 0;
 560
 561         /*
 562          * If we did not recognise the source of this interrupt,
 563          * warn the user, but don't flood the user with these messages.
 564          */
 565         if (!last || time_after(jiffies, last + 5*HZ)) {
 566                 last = jiffies;
 567                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 568                 ecard_dump_irq_state();
 569         }
 570 }
 571
 572 static void
 573 ecard_irq_handler(unsigned int irq, struct irq_desc *desc)
 574 {
 575         ecard_t *ec;
 576         int called = 0;
 577
 578         desc->irq_data.chip->irq_mask(&desc->irq_data);
 579         for (ec = cards; ec; ec = ec->next) {
 580                 int pending;
 581
 582                 if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
 583                         continue;
 584
 585                 if (ec->ops && ec->ops->irqpending)
 586                         pending = ec->ops->irqpending(ec);
 587                 else
 588                         pending = ecard_default_ops.irqpending(ec);
 589
 590                 if (pending) {
 591                         generic_handle_irq(ec->irq);
 592                         called ++;
 593                 }
 594         }
 595         desc->irq_data.chip->irq_unmask(&desc->irq_data);
 596
 597         if (called == 0)
 598                 ecard_check_lockup(desc);
 599 }
 600
 601 #ifdef HAS_EXPMASK
 602 static unsigned char priority_masks[] =
 603 {
 604         0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
 605 };
 606
 607 static unsigned char first_set[] =
 608 {
 609         0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
 610         0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
 611 };
 612
 613 static void
 614 ecard_irqexp_handler(unsigned int irq, struct irq_desc *desc)
 615 {
 616         const unsigned int statusmask = 15;
 617         unsigned int status;
 618
 619         status = __raw_readb(EXPMASK_STATUS) & statusmask;
 620         if (status) {
 621                 unsigned int slot = first_set[status];
 622                 ecard_t *ec = slot_to_ecard(slot);
 623
 624                 if (ec->claimed) {
 625                         /*
 626                          * this ugly code is so that we can operate a
 627                          * prioritorising system:
 628                          *
 629                          * Card 0       highest priority
 630                          * Card 1
 631                          * Card 2
 632                          * Card 3       lowest priority
 633                          *
 634                          * Serial cards should go in 0/1, ethernet/scsi in 2/3
 635                          * otherwise you will lose serial data at high speeds!
 636                          */
 637                         generic_handle_irq(ec->irq);
 638                 } else {
 639                         printk(KERN_WARNING "card%d: interrupt from unclaimed "
 640                                "card???\n", slot);
 641                         have_expmask &= ~(1 << slot);
 642                         __raw_writeb(have_expmask, EXPMASK_ENABLE);
 643                 }
 644         } else
 645                 printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
 646 }
 647
 648 static int __init ecard_probeirqhw(void)
 649 {
 650         ecard_t *ec;
 651         int found;
 652
 653         __raw_writeb(0x00, EXPMASK_ENABLE);
 654         __raw_writeb(0xff, EXPMASK_STATUS);
 655         found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
 656         __raw_writeb(0xff, EXPMASK_ENABLE);
 657
 658         if (found) {
 659                 printk(KERN_DEBUG "Expansion card interrupt "
 660                        "management hardware found\n");
 661
 662                 /* for each card present, set a bit to '1' */
 663                 have_expmask = 0x80000000;
 664
 665                 for (ec = cards; ec; ec = ec->next)
 666                         have_expmask |= 1 << ec->slot_no;
 667
 668                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 669         }
 670
 671         return found;
 672 }
 673 #else
 674 #define ecard_irqexp_handler NULL
 675 #define ecard_probeirqhw() (0)
 676 #endif
 677
 678 static void __iomem *__ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 679 {
 680         void __iomem *address = NULL;
 681         int slot = ec->slot_no;
 682
 683         if (ec->slot_no == 8)
 684                 return ECARD_MEMC8_BASE;
 685
 686         ectcr &= ~(1 << slot);
 687
 688         switch (type) {
 689         case ECARD_MEMC:
 690                 if (slot < 4)
 691                         address = ECARD_MEMC_BASE + (slot << 14);
 692                 break;
 693
 694         case ECARD_IOC:
 695                 if (slot < 4)
 696                         address = ECARD_IOC_BASE + (slot << 14);
 697                 else
 698                         address = ECARD_IOC4_BASE + ((slot - 4) << 14);
 699                 if (address)
 700                         address += speed << 19;
 701                 break;
 702
 703         case ECARD_EASI:
 704                 address = ECARD_EASI_BASE + (slot << 24);
 705                 if (speed == ECARD_FAST)
 706                         ectcr |= 1 << slot;
 707                 break;
 708
 709         default:
 710                 break;
 711         }
 712
 713 #ifdef IOMD_ECTCR
 714         iomd_writeb(ectcr, IOMD_ECTCR);
 715 #endif
 716         return address;
 717 }
 718
 719 static int ecard_prints(struct seq_file *m, ecard_t *ec)
 720 {
 721         seq_printf(m, "  %d: %s ", ec->slot_no, ec->easi ? "EASI" : "    ");
 722
 723         if (ec->cid.id == 0) {
 724                 struct in_chunk_dir incd;
 725
 726                 seq_printf(m, "[%04X:%04X] ",
 727                         ec->cid.manufacturer, ec->cid.product);
 728
 729                 if (!ec->card_desc && ec->cid.cd &&
 730                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 731                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 732
 733                         if (ec->card_desc)
 734                                 strcpy((char *)ec->card_desc, incd.d.string);
 735                 }
 736
 737                 seq_printf(m, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 738         } else
 739                 seq_printf(m, "Simple card %d\n", ec->cid.id);
 740
 741         return 0;
 742 }
 743
 744 static int ecard_devices_proc_show(struct seq_file *m, void *v)
 745 {
 746         ecard_t *ec = cards;
 747
 748         while (ec) {
 749                 ecard_prints(m, ec);
 750                 ec = ec->next;
 751         }
 752         return 0;
 753 }
 754
 755 static int ecard_devices_proc_open(struct inode *inode, struct file *file)
 756 {
 757         return single_open(file, ecard_devices_proc_show, NULL);
 758 }
 759
 760 static const struct file_operations bus_ecard_proc_fops = {
 761         .owner          = THIS_MODULE,
 762         .open           = ecard_devices_proc_open,
 763         .read           = seq_read,
 764         .llseek         = seq_lseek,
 765         .release        = single_release,
 766 };
 767
 768 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 769
 770 static void ecard_proc_init(void)
 771 {
 772         proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL);
 773         proc_create("devices", 0, proc_bus_ecard_dir, &bus_ecard_proc_fops);
 774 }
 775
 776 #define ec_set_resource(ec,nr,st,sz)                            \
 777         do {                                                    \
 778                 (ec)->resource[nr].name = dev_name(&ec->dev);   \
 779                 (ec)->resource[nr].start = st;                  \
 780                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 781                 (ec)->resource[nr].flags = IORESOURCE_MEM;      \
 782         } while (0)
 783
 784 static void __init ecard_free_card(struct expansion_card *ec)
 785 {
 786         int i;
 787
 788         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 789                 if (ec->resource[i].flags)
 790                         release_resource(&ec->resource[i]);
 791
 792         kfree(ec);
 793 }
 794
 795 static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 796 {
 797         struct expansion_card *ec;
 798         unsigned long base;
 799         int i;
 800
 801         ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
 802         if (!ec) {
 803                 ec = ERR_PTR(-ENOMEM);
 804                 goto nomem;
 805         }
 806
 807         ec->slot_no = slot;
 808         ec->easi = type == ECARD_EASI;
 809         ec->irq = NO_IRQ;
 810         ec->fiq = NO_IRQ;
 811         ec->dma = NO_DMA;
 812         ec->ops = &ecard_default_ops;
 813
 814         dev_set_name(&ec->dev, "ecard%d", slot);
 815         ec->dev.parent = NULL;
 816         ec->dev.bus = &ecard_bus_type;
 817         ec->dev.dma_mask = &ec->dma_mask;
 818         ec->dma_mask = (u64)0xffffffff;
 819         ec->dev.coherent_dma_mask = ec->dma_mask;
 820
 821         if (slot < 4) {
 822                 ec_set_resource(ec, ECARD_RES_MEMC,
 823                                 PODSLOT_MEMC_BASE + (slot << 14),
 824                                 PODSLOT_MEMC_SIZE);
 825                 base = PODSLOT_IOC0_BASE + (slot << 14);
 826         } else
 827                 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
 828
 829 #ifdef CONFIG_ARCH_RPC
 830         if (slot < 8) {
 831                 ec_set_resource(ec, ECARD_RES_EASI,
 832                                 PODSLOT_EASI_BASE + (slot << 24),
 833                                 PODSLOT_EASI_SIZE);
 834         }
 835
 836         if (slot == 8) {
 837                 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
 838         } else
 839 #endif
 840
 841         for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
 842                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 843                                 base + (i << 19), PODSLOT_IOC_SIZE);
 844
 845         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 846                 if (ec->resource[i].flags &&
 847                     request_resource(&iomem_resource, &ec->resource[i])) {
 848                         dev_err(&ec->dev, "resource(s) not available\n");
 849                         ec->resource[i].end -= ec->resource[i].start;
 850                         ec->resource[i].start = 0;
 851                         ec->resource[i].flags = 0;
 852                 }
 853         }
 854
 855  nomem:
 856         return ec;
 857 }
 858
 859 static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf)
 860 {
 861         struct expansion_card *ec = ECARD_DEV(dev);
 862         return sprintf(buf, "%u\n", ec->irq);
 863 }
 864
 865 static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
 866 {
 867         struct expansion_card *ec = ECARD_DEV(dev);
 868         return sprintf(buf, "%u\n", ec->dma);
 869 }
 870
 871 static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
 872 {
 873         struct expansion_card *ec = ECARD_DEV(dev);
 874         char *str = buf;
 875         int i;
 876
 877         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 878                 str += sprintf(str, "%08x %08x %08lx\n",
 879                                 ec->resource[i].start,
 880                                 ec->resource[i].end,
 881                                 ec->resource[i].flags);
 882
 883         return str - buf;
 884 }
 885
 886 static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf)
 887 {
 888         struct expansion_card *ec = ECARD_DEV(dev);
 889         return sprintf(buf, "%u\n", ec->cid.manufacturer);
 890 }
 891
 892 static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
 893 {
 894         struct expansion_card *ec = ECARD_DEV(dev);
 895         return sprintf(buf, "%u\n", ec->cid.product);
 896 }
 897
 898 static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
 899 {
 900         struct expansion_card *ec = ECARD_DEV(dev);
 901         return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
 902 }
 903
 904 static struct device_attribute ecard_dev_attrs[] = {
 905         __ATTR(device,   S_IRUGO, ecard_show_device,    NULL),
 906         __ATTR(dma,      S_IRUGO, ecard_show_dma,       NULL),
 907         __ATTR(irq,      S_IRUGO, ecard_show_irq,       NULL),
 908         __ATTR(resource, S_IRUGO, ecard_show_resources, NULL),
 909         __ATTR(type,     S_IRUGO, ecard_show_type,      NULL),
 910         __ATTR(vendor,   S_IRUGO, ecard_show_vendor,    NULL),
 911         __ATTR_NULL,
 912 };
 913
 914
 915 int ecard_request_resources(struct expansion_card *ec)
 916 {
 917         int i, err = 0;
 918
 919         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 920                 if (ecard_resource_end(ec, i) &&
 921                     !request_mem_region(ecard_resource_start(ec, i),
 922                                         ecard_resource_len(ec, i),
 923                                         ec->dev.driver->name)) {
 924                         err = -EBUSY;
 925                         break;
 926                 }
 927         }
 928
 929         if (err) {
 930                 while (i--)
 931                         if (ecard_resource_end(ec, i))
 932                                 release_mem_region(ecard_resource_start(ec, i),
 933                                                    ecard_resource_len(ec, i));
 934         }
 935         return err;
 936 }
 937 EXPORT_SYMBOL(ecard_request_resources);
 938
 939 void ecard_release_resources(struct expansion_card *ec)
 940 {
 941         int i;
 942
 943         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 944                 if (ecard_resource_end(ec, i))
 945                         release_mem_region(ecard_resource_start(ec, i),
 946                                            ecard_resource_len(ec, i));
 947 }
 948 EXPORT_SYMBOL(ecard_release_resources);
 949
 950 void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
 951 {
 952         ec->irq_data = irq_data;
 953         barrier();
 954         ec->ops = ops;
 955 }
 956 EXPORT_SYMBOL(ecard_setirq);
 957
 958 void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
 959                            unsigned long offset, unsigned long maxsize)
 960 {
 961         unsigned long start = ecard_resource_start(ec, res);
 962         unsigned long end = ecard_resource_end(ec, res);
 963
 964         if (offset > (end - start))
 965                 return NULL;
 966
 967         start += offset;
 968         if (maxsize && end - start > maxsize)
 969                 end = start + maxsize;
 970
 971         return devm_ioremap(&ec->dev, start, end - start);
 972 }
 973 EXPORT_SYMBOL(ecardm_iomap);
 974
 975 /*
 976  * Probe for an expansion card.
 977  *
 978  * If bit 1 of the first byte of the card is set, then the
 979  * card does not exist.
 980  */
 981 static int __init
 982 ecard_probe(int slot, card_type_t type)
 983 {
 984         ecard_t **ecp;
 985         ecard_t *ec;
 986         struct ex_ecid cid;
 987         void __iomem *addr;
 988         int i, rc;
 989
 990         ec = ecard_alloc_card(type, slot);
 991         if (IS_ERR(ec)) {
 992                 rc = PTR_ERR(ec);
 993                 goto nomem;
 994         }
 995
 996         rc = -ENODEV;
 997         if ((addr = __ecard_address(ec, type, ECARD_SYNC)) == NULL)
 998                 goto nodev;
 999
1000         cid.r_zero = 1;
1001         ecard_readbytes(&cid, ec, 0, 16, 0);
1002         if (cid.r_zero)
1003                 goto nodev;
1004
1005         ec->cid.id      = cid.r_id;
1006         ec->cid.cd      = cid.r_cd;
1007         ec->cid.is      = cid.r_is;
1008         ec->cid.w       = cid.r_w;
1009         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
1010         ec->cid.product = ecard_getu16(cid.r_prod);
1011         ec->cid.country = cid.r_country;
1012         ec->cid.irqmask = cid.r_irqmask;
1013         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
1014         ec->cid.fiqmask = cid.r_fiqmask;
1015         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
1016         ec->fiqaddr     =
1017         ec->irqaddr     = addr;
1018
1019         if (ec->cid.is) {
1020                 ec->irqmask = ec->cid.irqmask;
1021                 ec->irqaddr += ec->cid.irqoff;
1022                 ec->fiqmask = ec->cid.fiqmask;
1023                 ec->fiqaddr += ec->cid.fiqoff;
1024         } else {
1025                 ec->irqmask = 1;
1026                 ec->fiqmask = 4;
1027         }
1028
1029         for (i = 0; i < ARRAY_SIZE(blacklist); i++)
1030                 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
1031                     blacklist[i].product == ec->cid.product) {
1032                         ec->card_desc = blacklist[i].type;
1033                         break;
1034                 }
1035
1036         /*
1037          * hook the interrupt handlers
1038          */
1039         if (slot < 8) {
1040                 ec->irq = 32 + slot;
1041                 irq_set_chip_and_handler(ec->irq, &ecard_chip,
1042                                          handle_level_irq);
1043                 set_irq_flags(ec->irq, IRQF_VALID);
1044         }
1045
1046         if (slot == 8)
1047                 ec->irq = 11;
1048 #ifdef CONFIG_ARCH_RPC
1049         /* On RiscPC, only first two slots have DMA capability */
1050         if (slot < 2)
1051                 ec->dma = 2 + slot;
1052 #endif
1053
1054         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
1055
1056         *ecp = ec;
1057         slot_to_expcard[slot] = ec;
1058
1059         device_register(&ec->dev);
1060
1061         return 0;
1062
1063  nodev:
1064         ecard_free_card(ec);
1065  nomem:
1066         return rc;
1067 }
1068
1069 /*
1070  * Initialise the expansion card system.
1071  * Locate all hardware - interrupt management and
1072  * actual cards.
1073  */
1074 static int __init ecard_init(void)
1075 {
1076         struct task_struct *task;
1077         int slot, irqhw;
1078
1079         task = kthread_run(ecard_task, NULL, "kecardd");
1080         if (IS_ERR(task)) {
1081                 printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
1082                        PTR_ERR(task));
1083                 return PTR_ERR(task);
1084         }
1085
1086         printk("Probing expansion cards\n");
1087
1088         for (slot = 0; slot < 8; slot ++) {
1089                 if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
1090                         ecard_probe(slot, ECARD_IOC);
1091         }
1092
1093         ecard_probe(8, ECARD_IOC);
1094
1095         irqhw = ecard_probeirqhw();
1096
1097         irq_set_chained_handler(IRQ_EXPANSIONCARD,
1098                                 irqhw ? ecard_irqexp_handler : ecard_irq_handler);
1099
1100         ecard_proc_init();
1101
1102         return 0;
1103 }
1104
1105 subsys_initcall(ecard_init);
1106
1107 /*
1108  *      ECARD "bus"
1109  */
1110 static const struct ecard_id *
1111 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1112 {
1113         int i;
1114
1115         for (i = 0; ids[i].manufacturer != 65535; i++)
1116                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1117                     ec->cid.product == ids[i].product)
1118                         return ids + i;
1119
1120         return NULL;
1121 }
1122
1123 static int ecard_drv_probe(struct device *dev)
1124 {
1125         struct expansion_card *ec = ECARD_DEV(dev);
1126         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1127         const struct ecard_id *id;
1128         int ret;
1129
1130         id = ecard_match_device(drv->id_table, ec);
1131
1132         ec->claimed = 1;
1133         ret = drv->probe(ec, id);
1134         if (ret)
1135                 ec->claimed = 0;
1136         return ret;
1137 }
1138
1139 static int ecard_drv_remove(struct device *dev)
1140 {
1141         struct expansion_card *ec = ECARD_DEV(dev);
1142         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1143
1144         drv->remove(ec);
1145         ec->claimed = 0;
1146
1147         /*
1148          * Restore the default operations.  We ensure that the
1149          * ops are set before we change the data.
1150          */
1151         ec->ops = &ecard_default_ops;
1152         barrier();
1153         ec->irq_data = NULL;
1154
1155         return 0;
1156 }
1157
1158 /*
1159  * Before rebooting, we must make sure that the expansion card is in a
1160  * sensible state, so it can be re-detected.  This means that the first
1161  * page of the ROM must be visible.  We call the expansion cards reset
1162  * handler, if any.
1163  */
1164 static void ecard_drv_shutdown(struct device *dev)
1165 {
1166         struct expansion_card *ec = ECARD_DEV(dev);
1167         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1168         struct ecard_request req;
1169
1170         if (dev->driver) {
1171                 if (drv->shutdown)
1172                         drv->shutdown(ec);
1173                 ec->claimed = 0;
1174         }
1175
1176         /*
1177          * If this card has a loader, call the reset handler.
1178          */
1179         if (ec->loader) {
1180                 req.fn = ecard_task_reset;
1181                 req.ec = ec;
1182                 ecard_call(&req);
1183         }
1184 }
1185
1186 int ecard_register_driver(struct ecard_driver *drv)
1187 {
1188         drv->drv.bus = &ecard_bus_type;
1189
1190         return driver_register(&drv->drv);
1191 }
1192
1193 void ecard_remove_driver(struct ecard_driver *drv)
1194 {
1195         driver_unregister(&drv->drv);
1196 }
1197
1198 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1199 {
1200         struct expansion_card *ec = ECARD_DEV(_dev);
1201         struct ecard_driver *drv = ECARD_DRV(_drv);
1202         int ret;
1203
1204         if (drv->id_table) {
1205                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1206         } else {
1207                 ret = ec->cid.id == drv->id;
1208         }
1209
1210         return ret;
1211 }
1212
1213 struct bus_type ecard_bus_type = {
1214         .name           = "ecard",
1215         .dev_attrs      = ecard_dev_attrs,
1216         .match          = ecard_match,
1217         .probe          = ecard_drv_probe,
1218         .remove         = ecard_drv_remove,
1219         .shutdown       = ecard_drv_shutdown,
1220 };
1221
1222 static int ecard_bus_init(void)
1223 {
1224         return bus_register(&ecard_bus_type);
1225 }
1226
1227 postcore_initcall(ecard_bus_init);
1228
1229 EXPORT_SYMBOL(ecard_readchunk);
1230 EXPORT_SYMBOL(ecard_register_driver);
1231 EXPORT_SYMBOL(ecard_remove_driver);
1232 EXPORT_SYMBOL(ecard_bus_type);