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, 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_mm = mm;
 246
 247         flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
 248         flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
 249 }
 250
 251 static int ecard_init_mm(void)
 252 {
 253         struct mm_struct * mm = mm_alloc();
 254         struct mm_struct *active_mm = current->active_mm;
 255
 256         if (!mm)
 257                 return -ENOMEM;
 258
 259         current->mm = mm;
 260         current->active_mm = mm;
 261         activate_mm(active_mm, mm);
 262         mmdrop(active_mm);
 263         ecard_init_pgtables(mm);
 264         return 0;
 265 }
 266
 267 static int
 268 ecard_task(void * unused)
 269 {
 270         /*
 271          * Allocate a mm.  We're not a lazy-TLB kernel task since we need
 272          * to set page table entries where the user space would be.  Note
 273          * that this also creates the page tables.  Failure is not an
 274          * option here.
 275          */
 276         if (ecard_init_mm())
 277                 panic("kecardd: unable to alloc mm\n");
 278
 279         while (1) {
 280                 struct ecard_request *req;
 281
 282                 wait_event_interruptible(ecard_wait, ecard_req != NULL);
 283
 284                 req = xchg(&ecard_req, NULL);
 285                 if (req != NULL) {
 286                         req->fn(req);
 287                         complete(req->complete);
 288                 }
 289         }
 290 }
 291
 292 /*
 293  * Wake the expansion card daemon to action our request.
 294  *
 295  * FIXME: The test here is not sufficient to detect if the
 296  * kcardd is running.
 297  */
 298 static void ecard_call(struct ecard_request *req)
 299 {
 300         DECLARE_COMPLETION_ONSTACK(completion);
 301
 302         req->complete = &completion;
 303
 304         mutex_lock(&ecard_mutex);
 305         ecard_req = req;
 306         wake_up(&ecard_wait);
 307
 308         /*
 309          * Now wait for kecardd to run.
 310          */
 311         wait_for_completion(&completion);
 312         mutex_unlock(&ecard_mutex);
 313 }
 314
 315 /* ======================= Mid-level card control ===================== */
 316
 317 static void
 318 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
 319 {
 320         struct ecard_request req;
 321
 322         req.fn          = ecard_task_readbytes;
 323         req.ec          = ec;
 324         req.address     = off;
 325         req.length      = len;
 326         req.use_loader  = useld;
 327         req.buffer      = addr;
 328
 329         ecard_call(&req);
 330 }
 331
 332 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
 333 {
 334         struct ex_chunk_dir excd;
 335         int index = 16;
 336         int useld = 0;
 337
 338         if (!ec->cid.cd)
 339                 return 0;
 340
 341         while(1) {
 342                 ecard_readbytes(&excd, ec, index, 8, useld);
 343                 index += 8;
 344                 if (c_id(&excd) == 0) {
 345                         if (!useld && ec->loader) {
 346                                 useld = 1;
 347                                 index = 0;
 348                                 continue;
 349                         }
 350                         return 0;
 351                 }
 352                 if (c_id(&excd) == 0xf0) { /* link */
 353                         index = c_start(&excd);
 354                         continue;
 355                 }
 356                 if (c_id(&excd) == 0x80) { /* loader */
 357                         if (!ec->loader) {
 358                                 ec->loader = kmalloc(c_len(&excd),
 359                                                                GFP_KERNEL);
 360                                 if (ec->loader)
 361                                         ecard_readbytes(ec->loader, ec,
 362                                                         (int)c_start(&excd),
 363                                                         c_len(&excd), useld);
 364                                 else
 365                                         return 0;
 366                         }
 367                         continue;
 368                 }
 369                 if (c_id(&excd) == id && num-- == 0)
 370                         break;
 371         }
 372
 373         if (c_id(&excd) & 0x80) {
 374                 switch (c_id(&excd) & 0x70) {
 375                 case 0x70:
 376                         ecard_readbytes((unsigned char *)excd.d.string, ec,
 377                                         (int)c_start(&excd), c_len(&excd),
 378                                         useld);
 379                         break;
 380                 case 0x00:
 381                         break;
 382                 }
 383         }
 384         cd->start_offset = c_start(&excd);
 385         memcpy(cd->d.string, excd.d.string, 256);
 386         return 1;
 387 }
 388
 389 /* ======================= Interrupt control ============================ */
 390
 391 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 392 {
 393 #ifdef HAS_EXPMASK
 394         if (irqnr < 4 && have_expmask) {
 395                 have_expmask |= 1 << irqnr;
 396                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 397         }
 398 #endif
 399 }
 400
 401 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 402 {
 403 #ifdef HAS_EXPMASK
 404         if (irqnr < 4 && have_expmask) {
 405                 have_expmask &= ~(1 << irqnr);
 406                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 407         }
 408 #endif
 409 }
 410
 411 static int ecard_def_irq_pending(ecard_t *ec)
 412 {
 413         return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
 414 }
 415
 416 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 417 {
 418         panic("ecard_def_fiq_enable called - impossible");
 419 }
 420
 421 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 422 {
 423         panic("ecard_def_fiq_disable called - impossible");
 424 }
 425
 426 static int ecard_def_fiq_pending(ecard_t *ec)
 427 {
 428         return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
 429 }
 430
 431 static expansioncard_ops_t ecard_default_ops = {
 432         ecard_def_irq_enable,
 433         ecard_def_irq_disable,
 434         ecard_def_irq_pending,
 435         ecard_def_fiq_enable,
 436         ecard_def_fiq_disable,
 437         ecard_def_fiq_pending
 438 };
 439
 440 /*
 441  * Enable and disable interrupts from expansion cards.
 442  * (interrupts are disabled for these functions).
 443  *
 444  * They are not meant to be called directly, but via enable/disable_irq.
 445  */
 446 static void ecard_irq_unmask(unsigned int irqnr)
 447 {
 448         ecard_t *ec = slot_to_ecard(irqnr - 32);
 449
 450         if (ec) {
 451                 if (!ec->ops)
 452                         ec->ops = &ecard_default_ops;
 453
 454                 if (ec->claimed && ec->ops->irqenable)
 455                         ec->ops->irqenable(ec, irqnr);
 456                 else
 457                         printk(KERN_ERR "ecard: rejecting request to "
 458                                 "enable IRQs for %d\n", irqnr);
 459         }
 460 }
 461
 462 static void ecard_irq_mask(unsigned int irqnr)
 463 {
 464         ecard_t *ec = slot_to_ecard(irqnr - 32);
 465
 466         if (ec) {
 467                 if (!ec->ops)
 468                         ec->ops = &ecard_default_ops;
 469
 470                 if (ec->ops && ec->ops->irqdisable)
 471                         ec->ops->irqdisable(ec, irqnr);
 472         }
 473 }
 474
 475 static struct irq_chip ecard_chip = {
 476         .name   = "ECARD",
 477         .ack    = ecard_irq_mask,
 478         .mask   = ecard_irq_mask,
 479         .unmask = ecard_irq_unmask,
 480 };
 481
 482 void ecard_enablefiq(unsigned int fiqnr)
 483 {
 484         ecard_t *ec = slot_to_ecard(fiqnr);
 485
 486         if (ec) {
 487                 if (!ec->ops)
 488                         ec->ops = &ecard_default_ops;
 489
 490                 if (ec->claimed && ec->ops->fiqenable)
 491                         ec->ops->fiqenable(ec, fiqnr);
 492                 else
 493                         printk(KERN_ERR "ecard: rejecting request to "
 494                                 "enable FIQs for %d\n", fiqnr);
 495         }
 496 }
 497
 498 void ecard_disablefiq(unsigned int fiqnr)
 499 {
 500         ecard_t *ec = slot_to_ecard(fiqnr);
 501
 502         if (ec) {
 503                 if (!ec->ops)
 504                         ec->ops = &ecard_default_ops;
 505
 506                 if (ec->ops->fiqdisable)
 507                         ec->ops->fiqdisable(ec, fiqnr);
 508         }
 509 }
 510
 511 static void ecard_dump_irq_state(void)
 512 {
 513         ecard_t *ec;
 514
 515         printk("Expansion card IRQ state:\n");
 516
 517         for (ec = cards; ec; ec = ec->next) {
 518                 if (ec->slot_no == 8)
 519                         continue;
 520
 521                 printk("  %d: %sclaimed, ",
 522                        ec->slot_no, ec->claimed ? "" : "not ");
 523
 524                 if (ec->ops && ec->ops->irqpending &&
 525                     ec->ops != &ecard_default_ops)
 526                         printk("irq %spending\n",
 527                                ec->ops->irqpending(ec) ? "" : "not ");
 528                 else
 529                         printk("irqaddr %p, mask = %02X, status = %02X\n",
 530                                ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
 531         }
 532 }
 533
 534 static void ecard_check_lockup(struct irq_desc *desc)
 535 {
 536         static unsigned long last;
 537         static int lockup;
 538
 539         /*
 540          * If the timer interrupt has not run since the last million
 541          * unrecognised expansion card interrupts, then there is
 542          * something seriously wrong.  Disable the expansion card
 543          * interrupts so at least we can continue.
 544          *
 545          * Maybe we ought to start a timer to re-enable them some time
 546          * later?
 547          */
 548         if (last == jiffies) {
 549                 lockup += 1;
 550                 if (lockup > 1000000) {
 551                         printk(KERN_ERR "\nInterrupt lockup detected - "
 552                                "disabling all expansion card interrupts\n");
 553
 554                         desc->chip->mask(IRQ_EXPANSIONCARD);
 555                         ecard_dump_irq_state();
 556                 }
 557         } else
 558                 lockup = 0;
 559
 560         /*
 561          * If we did not recognise the source of this interrupt,
 562          * warn the user, but don't flood the user with these messages.
 563          */
 564         if (!last || time_after(jiffies, last + 5*HZ)) {
 565                 last = jiffies;
 566                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 567                 ecard_dump_irq_state();
 568         }
 569 }
 570
 571 static void
 572 ecard_irq_handler(unsigned int irq, struct irq_desc *desc)
 573 {
 574         ecard_t *ec;
 575         int called = 0;
 576
 577         desc->chip->mask(irq);
 578         for (ec = cards; ec; ec = ec->next) {
 579                 int pending;
 580
 581                 if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
 582                         continue;
 583
 584                 if (ec->ops && ec->ops->irqpending)
 585                         pending = ec->ops->irqpending(ec);
 586                 else
 587                         pending = ecard_default_ops.irqpending(ec);
 588
 589                 if (pending) {
 590                         generic_handle_irq(ec->irq);
 591                         called ++;
 592                 }
 593         }
 594         desc->chip->unmask(irq);
 595
 596         if (called == 0)
 597                 ecard_check_lockup(desc);
 598 }
 599
 600 #ifdef HAS_EXPMASK
 601 static unsigned char priority_masks[] =
 602 {
 603         0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
 604 };
 605
 606 static unsigned char first_set[] =
 607 {
 608         0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
 609         0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
 610 };
 611
 612 static void
 613 ecard_irqexp_handler(unsigned int irq, struct irq_desc *desc)
 614 {
 615         const unsigned int statusmask = 15;
 616         unsigned int status;
 617
 618         status = __raw_readb(EXPMASK_STATUS) & statusmask;
 619         if (status) {
 620                 unsigned int slot = first_set[status];
 621                 ecard_t *ec = slot_to_ecard(slot);
 622
 623                 if (ec->claimed) {
 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                         generic_handle_irq(ec->irq);
 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 static 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(struct seq_file *m, ecard_t *ec)
 726 {
 727         seq_printf(m, "  %d: %s ", ec->slot_no, ec->easi ? "EASI" : "    ");
 728
 729         if (ec->cid.id == 0) {
 730                 struct in_chunk_dir incd;
 731
 732                 seq_printf(m, "[%04X:%04X] ",
 733                         ec->cid.manufacturer, ec->cid.product);
 734
 735                 if (!ec->card_desc && ec->cid.cd &&
 736                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 737                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 738
 739                         if (ec->card_desc)
 740                                 strcpy((char *)ec->card_desc, incd.d.string);
 741                 }
 742
 743                 seq_printf(m, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 744         } else
 745                 seq_printf(m, "Simple card %d\n", ec->cid.id);
 746
 747         return 0;
 748 }
 749
 750 static int ecard_devices_proc_show(struct seq_file *m, void *v)
 751 {
 752         ecard_t *ec = cards;
 753
 754         while (ec) {
 755                 ecard_prints(m, ec);
 756                 ec = ec->next;
 757         }
 758         return 0;
 759 }
 760
 761 static int ecard_devices_proc_open(struct inode *inode, struct file *file)
 762 {
 763         return single_open(file, ecard_devices_proc_show, NULL);
 764 }
 765
 766 static const struct file_operations bus_ecard_proc_fops = {
 767         .owner          = THIS_MODULE,
 768         .open           = ecard_devices_proc_open,
 769         .read           = seq_read,
 770         .llseek         = seq_lseek,
 771         .release        = single_release,
 772 };
 773
 774 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 775
 776 static void ecard_proc_init(void)
 777 {
 778         proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL);
 779         proc_create("devices", 0, proc_bus_ecard_dir, &bus_ecard_proc_fops);
 780 }
 781
 782 #define ec_set_resource(ec,nr,st,sz)                            \
 783         do {                                                    \
 784                 (ec)->resource[nr].name = dev_name(&ec->dev);   \
 785                 (ec)->resource[nr].start = st;                  \
 786                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 787                 (ec)->resource[nr].flags = IORESOURCE_MEM;      \
 788         } while (0)
 789
 790 static void __init ecard_free_card(struct expansion_card *ec)
 791 {
 792         int i;
 793
 794         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 795                 if (ec->resource[i].flags)
 796                         release_resource(&ec->resource[i]);
 797
 798         kfree(ec);
 799 }
 800
 801 static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 802 {
 803         struct expansion_card *ec;
 804         unsigned long base;
 805         int i;
 806
 807         ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
 808         if (!ec) {
 809                 ec = ERR_PTR(-ENOMEM);
 810                 goto nomem;
 811         }
 812
 813         ec->slot_no = slot;
 814         ec->easi = type == ECARD_EASI;
 815         ec->irq = NO_IRQ;
 816         ec->fiq = NO_IRQ;
 817         ec->dma = NO_DMA;
 818         ec->ops = &ecard_default_ops;
 819
 820         snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
 821         ec->dev.parent = NULL;
 822         ec->dev.bus = &ecard_bus_type;
 823         ec->dev.dma_mask = &ec->dma_mask;
 824         ec->dma_mask = (u64)0xffffffff;
 825         ec->dev.coherent_dma_mask = ec->dma_mask;
 826
 827         if (slot < 4) {
 828                 ec_set_resource(ec, ECARD_RES_MEMC,
 829                                 PODSLOT_MEMC_BASE + (slot << 14),
 830                                 PODSLOT_MEMC_SIZE);
 831                 base = PODSLOT_IOC0_BASE + (slot << 14);
 832         } else
 833                 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
 834
 835 #ifdef CONFIG_ARCH_RPC
 836         if (slot < 8) {
 837                 ec_set_resource(ec, ECARD_RES_EASI,
 838                                 PODSLOT_EASI_BASE + (slot << 24),
 839                                 PODSLOT_EASI_SIZE);
 840         }
 841
 842         if (slot == 8) {
 843                 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
 844         } else
 845 #endif
 846
 847         for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
 848                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 849                                 base + (i << 19), PODSLOT_IOC_SIZE);
 850
 851         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 852                 if (ec->resource[i].flags &&
 853                     request_resource(&iomem_resource, &ec->resource[i])) {
 854                         dev_err(&ec->dev, "resource(s) not available\n");
 855                         ec->resource[i].end -= ec->resource[i].start;
 856                         ec->resource[i].start = 0;
 857                         ec->resource[i].flags = 0;
 858                 }
 859         }
 860
 861  nomem:
 862         return ec;
 863 }
 864
 865 static ssize_t ecard_show_irq(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->irq);
 869 }
 870
 871 static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
 872 {
 873         struct expansion_card *ec = ECARD_DEV(dev);
 874         return sprintf(buf, "%u\n", ec->dma);
 875 }
 876
 877 static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
 878 {
 879         struct expansion_card *ec = ECARD_DEV(dev);
 880         char *str = buf;
 881         int i;
 882
 883         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 884                 str += sprintf(str, "%08x %08x %08lx\n",
 885                                 ec->resource[i].start,
 886                                 ec->resource[i].end,
 887                                 ec->resource[i].flags);
 888
 889         return str - buf;
 890 }
 891
 892 static ssize_t ecard_show_vendor(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.manufacturer);
 896 }
 897
 898 static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
 899 {
 900         struct expansion_card *ec = ECARD_DEV(dev);
 901         return sprintf(buf, "%u\n", ec->cid.product);
 902 }
 903
 904 static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
 905 {
 906         struct expansion_card *ec = ECARD_DEV(dev);
 907         return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
 908 }
 909
 910 static struct device_attribute ecard_dev_attrs[] = {
 911         __ATTR(device,   S_IRUGO, ecard_show_device,    NULL),
 912         __ATTR(dma,      S_IRUGO, ecard_show_dma,       NULL),
 913         __ATTR(irq,      S_IRUGO, ecard_show_irq,       NULL),
 914         __ATTR(resource, S_IRUGO, ecard_show_resources, NULL),
 915         __ATTR(type,     S_IRUGO, ecard_show_type,      NULL),
 916         __ATTR(vendor,   S_IRUGO, ecard_show_vendor,    NULL),
 917         __ATTR_NULL,
 918 };
 919
 920
 921 int ecard_request_resources(struct expansion_card *ec)
 922 {
 923         int i, err = 0;
 924
 925         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 926                 if (ecard_resource_end(ec, i) &&
 927                     !request_mem_region(ecard_resource_start(ec, i),
 928                                         ecard_resource_len(ec, i),
 929                                         ec->dev.driver->name)) {
 930                         err = -EBUSY;
 931                         break;
 932                 }
 933         }
 934
 935         if (err) {
 936                 while (i--)
 937                         if (ecard_resource_end(ec, i))
 938                                 release_mem_region(ecard_resource_start(ec, i),
 939                                                    ecard_resource_len(ec, i));
 940         }
 941         return err;
 942 }
 943 EXPORT_SYMBOL(ecard_request_resources);
 944
 945 void ecard_release_resources(struct expansion_card *ec)
 946 {
 947         int i;
 948
 949         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 950                 if (ecard_resource_end(ec, i))
 951                         release_mem_region(ecard_resource_start(ec, i),
 952                                            ecard_resource_len(ec, i));
 953 }
 954 EXPORT_SYMBOL(ecard_release_resources);
 955
 956 void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
 957 {
 958         ec->irq_data = irq_data;
 959         barrier();
 960         ec->ops = ops;
 961 }
 962 EXPORT_SYMBOL(ecard_setirq);
 963
 964 void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
 965                            unsigned long offset, unsigned long maxsize)
 966 {
 967         unsigned long start = ecard_resource_start(ec, res);
 968         unsigned long end = ecard_resource_end(ec, res);
 969
 970         if (offset > (end - start))
 971                 return NULL;
 972
 973         start += offset;
 974         if (maxsize && end - start > maxsize)
 975                 end = start + maxsize;
 976
 977         return devm_ioremap(&ec->dev, start, end - start);
 978 }
 979 EXPORT_SYMBOL(ecardm_iomap);
 980
 981 /*
 982  * Probe for an expansion card.
 983  *
 984  * If bit 1 of the first byte of the card is set, then the
 985  * card does not exist.
 986  */
 987 static int __init
 988 ecard_probe(int slot, card_type_t type)
 989 {
 990         ecard_t **ecp;
 991         ecard_t *ec;
 992         struct ex_ecid cid;
 993         int i, rc;
 994
 995         ec = ecard_alloc_card(type, slot);
 996         if (IS_ERR(ec)) {
 997                 rc = PTR_ERR(ec);
 998                 goto nomem;
 999         }
1000
1001         rc = -ENODEV;
1002         if ((ec->podaddr = __ecard_address(ec, type, ECARD_SYNC)) == 0)
1003                 goto nodev;
1004
1005         cid.r_zero = 1;
1006         ecard_readbytes(&cid, ec, 0, 16, 0);
1007         if (cid.r_zero)
1008                 goto nodev;
1009
1010         ec->cid.id      = cid.r_id;
1011         ec->cid.cd      = cid.r_cd;
1012         ec->cid.is      = cid.r_is;
1013         ec->cid.w       = cid.r_w;
1014         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
1015         ec->cid.product = ecard_getu16(cid.r_prod);
1016         ec->cid.country = cid.r_country;
1017         ec->cid.irqmask = cid.r_irqmask;
1018         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
1019         ec->cid.fiqmask = cid.r_fiqmask;
1020         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
1021         ec->fiqaddr     =
1022         ec->irqaddr     = (void __iomem *)ioaddr(ec->podaddr);
1023
1024         if (ec->cid.is) {
1025                 ec->irqmask = ec->cid.irqmask;
1026                 ec->irqaddr += ec->cid.irqoff;
1027                 ec->fiqmask = ec->cid.fiqmask;
1028                 ec->fiqaddr += ec->cid.fiqoff;
1029         } else {
1030                 ec->irqmask = 1;
1031                 ec->fiqmask = 4;
1032         }
1033
1034         for (i = 0; i < ARRAY_SIZE(blacklist); i++)
1035                 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
1036                     blacklist[i].product == ec->cid.product) {
1037                         ec->card_desc = blacklist[i].type;
1038                         break;
1039                 }
1040
1041         /*
1042          * hook the interrupt handlers
1043          */
1044         if (slot < 8) {
1045                 ec->irq = 32 + slot;
1046                 set_irq_chip(ec->irq, &ecard_chip);
1047                 set_irq_handler(ec->irq, handle_level_irq);
1048                 set_irq_flags(ec->irq, IRQF_VALID);
1049         }
1050
1051 #ifdef IO_EC_MEMC8_BASE
1052         if (slot == 8)
1053                 ec->irq = 11;
1054 #endif
1055 #ifdef CONFIG_ARCH_RPC
1056         /* On RiscPC, only first two slots have DMA capability */
1057         if (slot < 2)
1058                 ec->dma = 2 + slot;
1059 #endif
1060
1061         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
1062
1063         *ecp = ec;
1064         slot_to_expcard[slot] = ec;
1065
1066         device_register(&ec->dev);
1067
1068         return 0;
1069
1070  nodev:
1071         ecard_free_card(ec);
1072  nomem:
1073         return rc;
1074 }
1075
1076 /*
1077  * Initialise the expansion card system.
1078  * Locate all hardware - interrupt management and
1079  * actual cards.
1080  */
1081 static int __init ecard_init(void)
1082 {
1083         struct task_struct *task;
1084         int slot, irqhw;
1085
1086         task = kthread_run(ecard_task, NULL, "kecardd");
1087         if (IS_ERR(task)) {
1088                 printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
1089                        PTR_ERR(task));
1090                 return PTR_ERR(task);
1091         }
1092
1093         printk("Probing expansion cards\n");
1094
1095         for (slot = 0; slot < 8; slot ++) {
1096                 if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
1097                         ecard_probe(slot, ECARD_IOC);
1098         }
1099
1100 #ifdef IO_EC_MEMC8_BASE
1101         ecard_probe(8, ECARD_IOC);
1102 #endif
1103
1104         irqhw = ecard_probeirqhw();
1105
1106         set_irq_chained_handler(IRQ_EXPANSIONCARD,
1107                                 irqhw ? ecard_irqexp_handler : ecard_irq_handler);
1108
1109         ecard_proc_init();
1110
1111         return 0;
1112 }
1113
1114 subsys_initcall(ecard_init);
1115
1116 /*
1117  *      ECARD "bus"
1118  */
1119 static const struct ecard_id *
1120 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1121 {
1122         int i;
1123
1124         for (i = 0; ids[i].manufacturer != 65535; i++)
1125                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1126                     ec->cid.product == ids[i].product)
1127                         return ids + i;
1128
1129         return NULL;
1130 }
1131
1132 static int ecard_drv_probe(struct device *dev)
1133 {
1134         struct expansion_card *ec = ECARD_DEV(dev);
1135         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1136         const struct ecard_id *id;
1137         int ret;
1138
1139         id = ecard_match_device(drv->id_table, ec);
1140
1141         ec->claimed = 1;
1142         ret = drv->probe(ec, id);
1143         if (ret)
1144                 ec->claimed = 0;
1145         return ret;
1146 }
1147
1148 static int ecard_drv_remove(struct device *dev)
1149 {
1150         struct expansion_card *ec = ECARD_DEV(dev);
1151         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1152
1153         drv->remove(ec);
1154         ec->claimed = 0;
1155
1156         /*
1157          * Restore the default operations.  We ensure that the
1158          * ops are set before we change the data.
1159          */
1160         ec->ops = &ecard_default_ops;
1161         barrier();
1162         ec->irq_data = NULL;
1163
1164         return 0;
1165 }
1166
1167 /*
1168  * Before rebooting, we must make sure that the expansion card is in a
1169  * sensible state, so it can be re-detected.  This means that the first
1170  * page of the ROM must be visible.  We call the expansion cards reset
1171  * handler, if any.
1172  */
1173 static void ecard_drv_shutdown(struct device *dev)
1174 {
1175         struct expansion_card *ec = ECARD_DEV(dev);
1176         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1177         struct ecard_request req;
1178
1179         if (dev->driver) {
1180                 if (drv->shutdown)
1181                         drv->shutdown(ec);
1182                 ec->claimed = 0;
1183         }
1184
1185         /*
1186          * If this card has a loader, call the reset handler.
1187          */
1188         if (ec->loader) {
1189                 req.fn = ecard_task_reset;
1190                 req.ec = ec;
1191                 ecard_call(&req);
1192         }
1193 }
1194
1195 int ecard_register_driver(struct ecard_driver *drv)
1196 {
1197         drv->drv.bus = &ecard_bus_type;
1198
1199         return driver_register(&drv->drv);
1200 }
1201
1202 void ecard_remove_driver(struct ecard_driver *drv)
1203 {
1204         driver_unregister(&drv->drv);
1205 }
1206
1207 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1208 {
1209         struct expansion_card *ec = ECARD_DEV(_dev);
1210         struct ecard_driver *drv = ECARD_DRV(_drv);
1211         int ret;
1212
1213         if (drv->id_table) {
1214                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1215         } else {
1216                 ret = ec->cid.id == drv->id;
1217         }
1218
1219         return ret;
1220 }
1221
1222 struct bus_type ecard_bus_type = {
1223         .name           = "ecard",
1224         .dev_attrs      = ecard_dev_attrs,
1225         .match          = ecard_match,
1226         .probe          = ecard_drv_probe,
1227         .remove         = ecard_drv_remove,
1228         .shutdown       = ecard_drv_shutdown,
1229 };
1230
1231 static int ecard_bus_init(void)
1232 {
1233         return bus_register(&ecard_bus_type);
1234 }
1235
1236 postcore_initcall(ecard_bus_init);
1237
1238 EXPORT_SYMBOL(ecard_readchunk);
1239 EXPORT_SYMBOL(ecard_register_driver);
1240 EXPORT_SYMBOL(ecard_remove_driver);
1241 EXPORT_SYMBOL(ecard_bus_type);