arch/arm/mach-rpc/ecard.c

   1 /*
   2  *  linux/arch/arm/kernel/ecard.c
   3  *
   4  *  Copyright 1995-2001 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Find all installed expansion cards, and handle interrupts from them.
  11  *
  12  *  Created from information from Acorns RiscOS3 PRMs
  13  *
  14  *  08-Dec-1996 RMK     Added code for the 9'th expansion card - the ether
  15  *                      podule slot.
  16  *  06-May-1997 RMK     Added blacklist for cards whose loader doesn't work.
  17  *  12-Sep-1997 RMK     Created new handling of interrupt enables/disables
  18  *                      - cards can now register their own routine to control
  19  *                      interrupts (recommended).
  20  *  29-Sep-1997 RMK     Expansion card interrupt hardware not being re-enabled
  21  *                      on reset from Linux. (Caused cards not to respond
  22  *                      under RiscOS without hard reset).
  23  *  15-Feb-1998 RMK     Added DMA support
  24  *  12-Sep-1998 RMK     Added EASI support
  25  *  10-Jan-1999 RMK     Run loaders in a simulated RISC OS environment.
  26  *  17-Apr-1999 RMK     Support for EASI Type C cycles.
  27  */
  28 #define ECARD_C
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/types.h>
  33 #include <linux/sched.h>
  34 #include <linux/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/irq.h>
  46 #include <linux/io.h>
  47
  48 #include <asm/dma.h>
  49 #include <asm/ecard.h>
  50 #include <mach/hardware.h>
  51 #include <asm/irq.h>
  52 #include <asm/mmu_context.h>
  53 #include <asm/mach/irq.h>
  54 #include <asm/tlbflush.h>
  55
  56 #include "ecard.h"
  57
  58 struct ecard_request {
  59         void            (*fn)(struct ecard_request *);
  60         ecard_t         *ec;
  61         unsigned int    address;
  62         unsigned int    length;
  63         unsigned int    use_loader;
  64         void            *buffer;
  65         struct completion *complete;
  66 };
  67
  68 struct expcard_blacklist {
  69         unsigned short   manufacturer;
  70         unsigned short   product;
  71         const char      *type;
  72 };
  73
  74 static ecard_t *cards;
  75 static ecard_t *slot_to_expcard[MAX_ECARDS];
  76 static unsigned int ectcr;
  77
  78 /* List of descriptions of cards which don't have an extended
  79  * identification, or chunk directories containing a description.
  80  */
  81 static struct expcard_blacklist __initdata blacklist[] = {
  82         { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
  83 };
  84
  85 asmlinkage extern int
  86 ecard_loader_reset(unsigned long base, loader_t loader);
  87 asmlinkage extern int
  88 ecard_loader_read(int off, unsigned long base, loader_t loader);
  89
  90 static inline unsigned short ecard_getu16(unsigned char *v)
  91 {
  92         return v[0] | v[1] << 8;
  93 }
  94
  95 static inline signed long ecard_gets24(unsigned char *v)
  96 {
  97         return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
  98 }
  99
 100 static inline ecard_t *slot_to_ecard(unsigned int slot)
 101 {
 102         return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
 103 }
 104
 105 /* ===================== Expansion card daemon ======================== */
 106 /*
 107  * Since the loader programs on the expansion cards need to be run
 108  * in a specific environment, create a separate task with this
 109  * environment up, and pass requests to this task as and when we
 110  * need to.
 111  *
 112  * This should allow 99% of loaders to be called from Linux.
 113  *
 114  * From a security standpoint, we trust the card vendors.  This
 115  * may be a misplaced trust.
 116  */
 117 static void ecard_task_reset(struct ecard_request *req)
 118 {
 119         struct expansion_card *ec = req->ec;
 120         struct resource *res;
 121
 122         res = ec->slot_no == 8
 123                 ? &ec->resource[ECARD_RES_MEMC]
 124                 : ec->easi
 125                   ? &ec->resource[ECARD_RES_EASI]
 126                   : &ec->resource[ECARD_RES_IOCSYNC];
 127
 128         ecard_loader_reset(res->start, ec->loader);
 129 }
 130
 131 static void ecard_task_readbytes(struct ecard_request *req)
 132 {
 133         struct expansion_card *ec = req->ec;
 134         unsigned char *buf = req->buffer;
 135         unsigned int len = req->length;
 136         unsigned int off = req->address;
 137
 138         if (ec->slot_no == 8) {
 139                 void __iomem *base = (void __iomem *)
 140                                 ec->resource[ECARD_RES_MEMC].start;
 141
 142                 /*
 143                  * The card maintains an index which increments the address
 144                  * into a 4096-byte page on each access.  We need to keep
 145                  * track of the counter.
 146                  */
 147                 static unsigned int index;
 148                 unsigned int page;
 149
 150                 page = (off >> 12) * 4;
 151                 if (page > 256 * 4)
 152                         return;
 153
 154                 off &= 4095;
 155
 156                 /*
 157                  * If we are reading offset 0, or our current index is
 158                  * greater than the offset, reset the hardware index counter.
 159                  */
 160                 if (off == 0 || index > off) {
 161                         writeb(0, base);
 162                         index = 0;
 163                 }
 164
 165                 /*
 166                  * Increment the hardware index counter until we get to the
 167                  * required offset.  The read bytes are discarded.
 168                  */
 169                 while (index < off) {
 170                         readb(base + page);
 171                         index += 1;
 172                 }
 173
 174                 while (len--) {
 175                         *buf++ = readb(base + page);
 176                         index += 1;
 177                 }
 178         } else {
 179                 unsigned long base = (ec->easi
 180                          ? &ec->resource[ECARD_RES_EASI]
 181                          : &ec->resource[ECARD_RES_IOCSYNC])->start;
 182                 void __iomem *pbase = (void __iomem *)base;
 183
 184                 if (!req->use_loader || !ec->loader) {
 185                         off *= 4;
 186                         while (len--) {
 187                                 *buf++ = readb(pbase + off);
 188                                 off += 4;
 189                         }
 190                 } else {
 191                         while(len--) {
 192                                 /*
 193                                  * The following is required by some
 194                                  * expansion card loader programs.
 195                                  */
 196                                 *(unsigned long *)0x108 = 0;
 197                                 *buf++ = ecard_loader_read(off++, base,
 198                                                            ec->loader);
 199                         }
 200                 }
 201         }
 202
 203 }
 204
 205 static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
 206 static struct ecard_request *ecard_req;
 207 static DEFINE_MUTEX(ecard_mutex);
 208
 209 /*
 210  * Set up the expansion card daemon's page tables.
 211  */
 212 static void ecard_init_pgtables(struct mm_struct *mm)
 213 {
 214         struct vm_area_struct vma;
 215
 216         /* We want to set up the page tables for the following mapping:
 217          *  Virtual     Physical
 218          *  0x03000000  0x03000000
 219          *  0x03010000  unmapped
 220          *  0x03210000  0x03210000
 221          *  0x03400000  unmapped
 222          *  0x08000000  0x08000000
 223          *  0x10000000  unmapped
 224          *
 225          * FIXME: we don't follow this 100% yet.
 226          */
 227         pgd_t *src_pgd, *dst_pgd;
 228
 229         src_pgd = pgd_offset(mm, (unsigned long)IO_BASE);
 230         dst_pgd = pgd_offset(mm, IO_START);
 231
 232         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));
 233
 234         src_pgd = pgd_offset(mm, (unsigned long)EASI_BASE);
 235         dst_pgd = pgd_offset(mm, EASI_START);
 236
 237         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));
 238
 239         vma.vm_flags = VM_EXEC;
 240         vma.vm_mm = mm;
 241
 242         flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
 243         flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
 244 }
 245
 246 static int ecard_init_mm(void)
 247 {
 248         struct mm_struct * mm = mm_alloc();
 249         struct mm_struct *active_mm = current->active_mm;
 250
 251         if (!mm)
 252                 return -ENOMEM;
 253
 254         current->mm = mm;
 255         current->active_mm = mm;
 256         activate_mm(active_mm, mm);
 257         mmdrop(active_mm);
 258         ecard_init_pgtables(mm);
 259         return 0;
 260 }
 261
 262 static int
 263 ecard_task(void * unused)
 264 {
 265         /*
 266          * Allocate a mm.  We're not a lazy-TLB kernel task since we need
 267          * to set page table entries where the user space would be.  Note
 268          * that this also creates the page tables.  Failure is not an
 269          * option here.
 270          */
 271         if (ecard_init_mm())
 272                 panic("kecardd: unable to alloc mm\n");
 273
 274         while (1) {
 275                 struct ecard_request *req;
 276
 277                 wait_event_interruptible(ecard_wait, ecard_req != NULL);
 278
 279                 req = xchg(&ecard_req, NULL);
 280                 if (req != NULL) {
 281                         req->fn(req);
 282                         complete(req->complete);
 283                 }
 284         }
 285 }
 286
 287 /*
 288  * Wake the expansion card daemon to action our request.
 289  *
 290  * FIXME: The test here is not sufficient to detect if the
 291  * kcardd is running.
 292  */
 293 static void ecard_call(struct ecard_request *req)
 294 {
 295         DECLARE_COMPLETION_ONSTACK(completion);
 296
 297         req->complete = &completion;
 298
 299         mutex_lock(&ecard_mutex);
 300         ecard_req = req;
 301         wake_up(&ecard_wait);
 302
 303         /*
 304          * Now wait for kecardd to run.
 305          */
 306         wait_for_completion(&completion);
 307         mutex_unlock(&ecard_mutex);
 308 }
 309
 310 /* ======================= Mid-level card control ===================== */
 311
 312 static void
 313 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
 314 {
 315         struct ecard_request req;
 316
 317         req.fn          = ecard_task_readbytes;
 318         req.ec          = ec;
 319         req.address     = off;
 320         req.length      = len;
 321         req.use_loader  = useld;
 322         req.buffer      = addr;
 323
 324         ecard_call(&req);
 325 }
 326
 327 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
 328 {
 329         struct ex_chunk_dir excd;
 330         int index = 16;
 331         int useld = 0;
 332
 333         if (!ec->cid.cd)
 334                 return 0;
 335
 336         while(1) {
 337                 ecard_readbytes(&excd, ec, index, 8, useld);
 338                 index += 8;
 339                 if (c_id(&excd) == 0) {
 340                         if (!useld && ec->loader) {
 341                                 useld = 1;
 342                                 index = 0;
 343                                 continue;
 344                         }
 345                         return 0;
 346                 }
 347                 if (c_id(&excd) == 0xf0) { /* link */
 348                         index = c_start(&excd);
 349                         continue;
 350                 }
 351                 if (c_id(&excd) == 0x80) { /* loader */
 352                         if (!ec->loader) {
 353                                 ec->loader = kmalloc(c_len(&excd),
 354                                                                GFP_KERNEL);
 355                                 if (ec->loader)
 356                                         ecard_readbytes(ec->loader, ec,
 357                                                         (int)c_start(&excd),
 358                                                         c_len(&excd), useld);
 359                                 else
 360                                         return 0;
 361                         }
 362                         continue;
 363                 }
 364                 if (c_id(&excd) == id && num-- == 0)
 365                         break;
 366         }
 367
 368         if (c_id(&excd) & 0x80) {
 369                 switch (c_id(&excd) & 0x70) {
 370                 case 0x70:
 371                         ecard_readbytes((unsigned char *)excd.d.string, ec,
 372                                         (int)c_start(&excd), c_len(&excd),
 373                                         useld);
 374                         break;
 375                 case 0x00:
 376                         break;
 377                 }
 378         }
 379         cd->start_offset = c_start(&excd);
 380         memcpy(cd->d.string, excd.d.string, 256);
 381         return 1;
 382 }
 383
 384 /* ======================= Interrupt control ============================ */
 385
 386 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 387 {
 388 }
 389
 390 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 391 {
 392 }
 393
 394 static int ecard_def_irq_pending(ecard_t *ec)
 395 {
 396         return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
 397 }
 398
 399 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 400 {
 401         panic("ecard_def_fiq_enable called - impossible");
 402 }
 403
 404 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 405 {
 406         panic("ecard_def_fiq_disable called - impossible");
 407 }
 408
 409 static int ecard_def_fiq_pending(ecard_t *ec)
 410 {
 411         return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
 412 }
 413
 414 static expansioncard_ops_t ecard_default_ops = {
 415         ecard_def_irq_enable,
 416         ecard_def_irq_disable,
 417         ecard_def_irq_pending,
 418         ecard_def_fiq_enable,
 419         ecard_def_fiq_disable,
 420         ecard_def_fiq_pending
 421 };
 422
 423 /*
 424  * Enable and disable interrupts from expansion cards.
 425  * (interrupts are disabled for these functions).
 426  *
 427  * They are not meant to be called directly, but via enable/disable_irq.
 428  */
 429 static void ecard_irq_unmask(struct irq_data *d)
 430 {
 431         ecard_t *ec = irq_data_get_irq_chip_data(d);
 432
 433         if (ec) {
 434                 if (!ec->ops)
 435                         ec->ops = &ecard_default_ops;
 436
 437                 if (ec->claimed && ec->ops->irqenable)
 438                         ec->ops->irqenable(ec, d->irq);
 439                 else
 440                         printk(KERN_ERR "ecard: rejecting request to "
 441                                 "enable IRQs for %d\n", d->irq);
 442         }
 443 }
 444
 445 static void ecard_irq_mask(struct irq_data *d)
 446 {
 447         ecard_t *ec = irq_data_get_irq_chip_data(d);
 448
 449         if (ec) {
 450                 if (!ec->ops)
 451                         ec->ops = &ecard_default_ops;
 452
 453                 if (ec->ops && ec->ops->irqdisable)
 454                         ec->ops->irqdisable(ec, d->irq);
 455         }
 456 }
 457
 458 static struct irq_chip ecard_chip = {
 459         .name           = "ECARD",
 460         .irq_ack        = ecard_irq_mask,
 461         .irq_mask       = ecard_irq_mask,
 462         .irq_unmask     = ecard_irq_unmask,
 463 };
 464
 465 void ecard_enablefiq(unsigned int fiqnr)
 466 {
 467         ecard_t *ec = slot_to_ecard(fiqnr);
 468
 469         if (ec) {
 470                 if (!ec->ops)
 471                         ec->ops = &ecard_default_ops;
 472
 473                 if (ec->claimed && ec->ops->fiqenable)
 474                         ec->ops->fiqenable(ec, fiqnr);
 475                 else
 476                         printk(KERN_ERR "ecard: rejecting request to "
 477                                 "enable FIQs for %d\n", fiqnr);
 478         }
 479 }
 480
 481 void ecard_disablefiq(unsigned int fiqnr)
 482 {
 483         ecard_t *ec = slot_to_ecard(fiqnr);
 484
 485         if (ec) {
 486                 if (!ec->ops)
 487                         ec->ops = &ecard_default_ops;
 488
 489                 if (ec->ops->fiqdisable)
 490                         ec->ops->fiqdisable(ec, fiqnr);
 491         }
 492 }
 493
 494 static void ecard_dump_irq_state(void)
 495 {
 496         ecard_t *ec;
 497
 498         printk("Expansion card IRQ state:\n");
 499
 500         for (ec = cards; ec; ec = ec->next) {
 501                 if (ec->slot_no == 8)
 502                         continue;
 503
 504                 printk("  %d: %sclaimed, ",
 505                        ec->slot_no, ec->claimed ? "" : "not ");
 506
 507                 if (ec->ops && ec->ops->irqpending &&
 508                     ec->ops != &ecard_default_ops)
 509                         printk("irq %spending\n",
 510                                ec->ops->irqpending(ec) ? "" : "not ");
 511                 else
 512                         printk("irqaddr %p, mask = %02X, status = %02X\n",
 513                                ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
 514         }
 515 }
 516
 517 static void ecard_check_lockup(struct irq_desc *desc)
 518 {
 519         static unsigned long last;
 520         static int lockup;
 521
 522         /*
 523          * If the timer interrupt has not run since the last million
 524          * unrecognised expansion card interrupts, then there is
 525          * something seriously wrong.  Disable the expansion card
 526          * interrupts so at least we can continue.
 527          *
 528          * Maybe we ought to start a timer to re-enable them some time
 529          * later?
 530          */
 531         if (last == jiffies) {
 532                 lockup += 1;
 533                 if (lockup > 1000000) {
 534                         printk(KERN_ERR "\nInterrupt lockup detected - "
 535                                "disabling all expansion card interrupts\n");
 536
 537                         desc->irq_data.chip->irq_mask(&desc->irq_data);
 538                         ecard_dump_irq_state();
 539                 }
 540         } else
 541                 lockup = 0;
 542
 543         /*
 544          * If we did not recognise the source of this interrupt,
 545          * warn the user, but don't flood the user with these messages.
 546          */
 547         if (!last || time_after(jiffies, last + 5*HZ)) {
 548                 last = jiffies;
 549                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 550                 ecard_dump_irq_state();
 551         }
 552 }
 553
 554 static void ecard_irq_handler(struct irq_desc *desc)
 555 {
 556         ecard_t *ec;
 557         int called = 0;
 558
 559         desc->irq_data.chip->irq_mask(&desc->irq_data);
 560         for (ec = cards; ec; ec = ec->next) {
 561                 int pending;
 562
 563                 if (!ec->claimed || !ec->irq || ec->slot_no == 8)
 564                         continue;
 565
 566                 if (ec->ops && ec->ops->irqpending)
 567                         pending = ec->ops->irqpending(ec);
 568                 else
 569                         pending = ecard_default_ops.irqpending(ec);
 570
 571                 if (pending) {
 572                         generic_handle_irq(ec->irq);
 573                         called ++;
 574                 }
 575         }
 576         desc->irq_data.chip->irq_unmask(&desc->irq_data);
 577
 578         if (called == 0)
 579                 ecard_check_lockup(desc);
 580 }
 581
 582 static void __iomem *__ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 583 {
 584         void __iomem *address = NULL;
 585         int slot = ec->slot_no;
 586
 587         if (ec->slot_no == 8)
 588                 return ECARD_MEMC8_BASE;
 589
 590         ectcr &= ~(1 << slot);
 591
 592         switch (type) {
 593         case ECARD_MEMC:
 594                 if (slot < 4)
 595                         address = ECARD_MEMC_BASE + (slot << 14);
 596                 break;
 597
 598         case ECARD_IOC:
 599                 if (slot < 4)
 600                         address = ECARD_IOC_BASE + (slot << 14);
 601                 else
 602                         address = ECARD_IOC4_BASE + ((slot - 4) << 14);
 603                 if (address)
 604                         address += speed << 19;
 605                 break;
 606
 607         case ECARD_EASI:
 608                 address = ECARD_EASI_BASE + (slot << 24);
 609                 if (speed == ECARD_FAST)
 610                         ectcr |= 1 << slot;
 611                 break;
 612
 613         default:
 614                 break;
 615         }
 616
 617 #ifdef IOMD_ECTCR
 618         iomd_writeb(ectcr, IOMD_ECTCR);
 619 #endif
 620         return address;
 621 }
 622
 623 static int ecard_prints(struct seq_file *m, ecard_t *ec)
 624 {
 625         seq_printf(m, "  %d: %s ", ec->slot_no, ec->easi ? "EASI" : "    ");
 626
 627         if (ec->cid.id == 0) {
 628                 struct in_chunk_dir incd;
 629
 630                 seq_printf(m, "[%04X:%04X] ",
 631                         ec->cid.manufacturer, ec->cid.product);
 632
 633                 if (!ec->card_desc && ec->cid.cd &&
 634                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 635                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 636
 637                         if (ec->card_desc)
 638                                 strcpy((char *)ec->card_desc, incd.d.string);
 639                 }
 640
 641                 seq_printf(m, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 642         } else
 643                 seq_printf(m, "Simple card %d\n", ec->cid.id);
 644
 645         return 0;
 646 }
 647
 648 static int ecard_devices_proc_show(struct seq_file *m, void *v)
 649 {
 650         ecard_t *ec = cards;
 651
 652         while (ec) {
 653                 ecard_prints(m, ec);
 654                 ec = ec->next;
 655         }
 656         return 0;
 657 }
 658
 659 static int ecard_devices_proc_open(struct inode *inode, struct file *file)
 660 {
 661         return single_open(file, ecard_devices_proc_show, NULL);
 662 }
 663
 664 static const struct file_operations bus_ecard_proc_fops = {
 665         .owner          = THIS_MODULE,
 666         .open           = ecard_devices_proc_open,
 667         .read           = seq_read,
 668         .llseek         = seq_lseek,
 669         .release        = single_release,
 670 };
 671
 672 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 673
 674 static void ecard_proc_init(void)
 675 {
 676         proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL);
 677         proc_create("devices", 0, proc_bus_ecard_dir, &bus_ecard_proc_fops);
 678 }
 679
 680 #define ec_set_resource(ec,nr,st,sz)                            \
 681         do {                                                    \
 682                 (ec)->resource[nr].name = dev_name(&ec->dev);   \
 683                 (ec)->resource[nr].start = st;                  \
 684                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 685                 (ec)->resource[nr].flags = IORESOURCE_MEM;      \
 686         } while (0)
 687
 688 static void __init ecard_free_card(struct expansion_card *ec)
 689 {
 690         int i;
 691
 692         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 693                 if (ec->resource[i].flags)
 694                         release_resource(&ec->resource[i]);
 695
 696         kfree(ec);
 697 }
 698
 699 static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 700 {
 701         struct expansion_card *ec;
 702         unsigned long base;
 703         int i;
 704
 705         ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
 706         if (!ec) {
 707                 ec = ERR_PTR(-ENOMEM);
 708                 goto nomem;
 709         }
 710
 711         ec->slot_no = slot;
 712         ec->easi = type == ECARD_EASI;
 713         ec->irq = 0;
 714         ec->fiq = 0;
 715         ec->dma = NO_DMA;
 716         ec->ops = &ecard_default_ops;
 717
 718         dev_set_name(&ec->dev, "ecard%d", slot);
 719         ec->dev.parent = NULL;
 720         ec->dev.bus = &ecard_bus_type;
 721         ec->dev.dma_mask = &ec->dma_mask;
 722         ec->dma_mask = (u64)0xffffffff;
 723         ec->dev.coherent_dma_mask = ec->dma_mask;
 724
 725         if (slot < 4) {
 726                 ec_set_resource(ec, ECARD_RES_MEMC,
 727                                 PODSLOT_MEMC_BASE + (slot << 14),
 728                                 PODSLOT_MEMC_SIZE);
 729                 base = PODSLOT_IOC0_BASE + (slot << 14);
 730         } else
 731                 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
 732
 733 #ifdef CONFIG_ARCH_RPC
 734         if (slot < 8) {
 735                 ec_set_resource(ec, ECARD_RES_EASI,
 736                                 PODSLOT_EASI_BASE + (slot << 24),
 737                                 PODSLOT_EASI_SIZE);
 738         }
 739
 740         if (slot == 8) {
 741                 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
 742         } else
 743 #endif
 744
 745         for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
 746                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 747                                 base + (i << 19), PODSLOT_IOC_SIZE);
 748
 749         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 750                 if (ec->resource[i].flags &&
 751                     request_resource(&iomem_resource, &ec->resource[i])) {
 752                         dev_err(&ec->dev, "resource(s) not available\n");
 753                         ec->resource[i].end -= ec->resource[i].start;
 754                         ec->resource[i].start = 0;
 755                         ec->resource[i].flags = 0;
 756                 }
 757         }
 758
 759  nomem:
 760         return ec;
 761 }
 762
 763 static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf)
 764 {
 765         struct expansion_card *ec = ECARD_DEV(dev);
 766         return sprintf(buf, "%u\n", ec->irq);
 767 }
 768
 769 static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
 770 {
 771         struct expansion_card *ec = ECARD_DEV(dev);
 772         return sprintf(buf, "%u\n", ec->dma);
 773 }
 774
 775 static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
 776 {
 777         struct expansion_card *ec = ECARD_DEV(dev);
 778         char *str = buf;
 779         int i;
 780
 781         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 782                 str += sprintf(str, "%08x %08x %08lx\n",
 783                                 ec->resource[i].start,
 784                                 ec->resource[i].end,
 785                                 ec->resource[i].flags);
 786
 787         return str - buf;
 788 }
 789
 790 static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf)
 791 {
 792         struct expansion_card *ec = ECARD_DEV(dev);
 793         return sprintf(buf, "%u\n", ec->cid.manufacturer);
 794 }
 795
 796 static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
 797 {
 798         struct expansion_card *ec = ECARD_DEV(dev);
 799         return sprintf(buf, "%u\n", ec->cid.product);
 800 }
 801
 802 static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
 803 {
 804         struct expansion_card *ec = ECARD_DEV(dev);
 805         return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
 806 }
 807
 808 static struct device_attribute ecard_dev_attrs[] = {
 809         __ATTR(device,   S_IRUGO, ecard_show_device,    NULL),
 810         __ATTR(dma,      S_IRUGO, ecard_show_dma,       NULL),
 811         __ATTR(irq,      S_IRUGO, ecard_show_irq,       NULL),
 812         __ATTR(resource, S_IRUGO, ecard_show_resources, NULL),
 813         __ATTR(type,     S_IRUGO, ecard_show_type,      NULL),
 814         __ATTR(vendor,   S_IRUGO, ecard_show_vendor,    NULL),
 815         __ATTR_NULL,
 816 };
 817
 818
 819 int ecard_request_resources(struct expansion_card *ec)
 820 {
 821         int i, err = 0;
 822
 823         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 824                 if (ecard_resource_end(ec, i) &&
 825                     !request_mem_region(ecard_resource_start(ec, i),
 826                                         ecard_resource_len(ec, i),
 827                                         ec->dev.driver->name)) {
 828                         err = -EBUSY;
 829                         break;
 830                 }
 831         }
 832
 833         if (err) {
 834                 while (i--)
 835                         if (ecard_resource_end(ec, i))
 836                                 release_mem_region(ecard_resource_start(ec, i),
 837                                                    ecard_resource_len(ec, i));
 838         }
 839         return err;
 840 }
 841 EXPORT_SYMBOL(ecard_request_resources);
 842
 843 void ecard_release_resources(struct expansion_card *ec)
 844 {
 845         int i;
 846
 847         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 848                 if (ecard_resource_end(ec, i))
 849                         release_mem_region(ecard_resource_start(ec, i),
 850                                            ecard_resource_len(ec, i));
 851 }
 852 EXPORT_SYMBOL(ecard_release_resources);
 853
 854 void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
 855 {
 856         ec->irq_data = irq_data;
 857         barrier();
 858         ec->ops = ops;
 859 }
 860 EXPORT_SYMBOL(ecard_setirq);
 861
 862 void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
 863                            unsigned long offset, unsigned long maxsize)
 864 {
 865         unsigned long start = ecard_resource_start(ec, res);
 866         unsigned long end = ecard_resource_end(ec, res);
 867
 868         if (offset > (end - start))
 869                 return NULL;
 870
 871         start += offset;
 872         if (maxsize && end - start > maxsize)
 873                 end = start + maxsize;
 874
 875         return devm_ioremap(&ec->dev, start, end - start);
 876 }
 877 EXPORT_SYMBOL(ecardm_iomap);
 878
 879 /*
 880  * Probe for an expansion card.
 881  *
 882  * If bit 1 of the first byte of the card is set, then the
 883  * card does not exist.
 884  */
 885 static int __init ecard_probe(int slot, unsigned irq, card_type_t type)
 886 {
 887         ecard_t **ecp;
 888         ecard_t *ec;
 889         struct ex_ecid cid;
 890         void __iomem *addr;
 891         int i, rc;
 892
 893         ec = ecard_alloc_card(type, slot);
 894         if (IS_ERR(ec)) {
 895                 rc = PTR_ERR(ec);
 896                 goto nomem;
 897         }
 898
 899         rc = -ENODEV;
 900         if ((addr = __ecard_address(ec, type, ECARD_SYNC)) == NULL)
 901                 goto nodev;
 902
 903         cid.r_zero = 1;
 904         ecard_readbytes(&cid, ec, 0, 16, 0);
 905         if (cid.r_zero)
 906                 goto nodev;
 907
 908         ec->cid.id      = cid.r_id;
 909         ec->cid.cd      = cid.r_cd;
 910         ec->cid.is      = cid.r_is;
 911         ec->cid.w       = cid.r_w;
 912         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
 913         ec->cid.product = ecard_getu16(cid.r_prod);
 914         ec->cid.country = cid.r_country;
 915         ec->cid.irqmask = cid.r_irqmask;
 916         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
 917         ec->cid.fiqmask = cid.r_fiqmask;
 918         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
 919         ec->fiqaddr     =
 920         ec->irqaddr     = addr;
 921
 922         if (ec->cid.is) {
 923                 ec->irqmask = ec->cid.irqmask;
 924                 ec->irqaddr += ec->cid.irqoff;
 925                 ec->fiqmask = ec->cid.fiqmask;
 926                 ec->fiqaddr += ec->cid.fiqoff;
 927         } else {
 928                 ec->irqmask = 1;
 929                 ec->fiqmask = 4;
 930         }
 931
 932         for (i = 0; i < ARRAY_SIZE(blacklist); i++)
 933                 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
 934                     blacklist[i].product == ec->cid.product) {
 935                         ec->card_desc = blacklist[i].type;
 936                         break;
 937                 }
 938
 939         ec->irq = irq;
 940
 941         /*
 942          * hook the interrupt handlers
 943          */
 944         if (slot < 8) {
 945                 irq_set_chip_and_handler(ec->irq, &ecard_chip,
 946                                          handle_level_irq);
 947                 irq_set_chip_data(ec->irq, ec);
 948                 irq_clear_status_flags(ec->irq, IRQ_NOREQUEST);
 949         }
 950
 951 #ifdef CONFIG_ARCH_RPC
 952         /* On RiscPC, only first two slots have DMA capability */
 953         if (slot < 2)
 954                 ec->dma = 2 + slot;
 955 #endif
 956
 957         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
 958
 959         *ecp = ec;
 960         slot_to_expcard[slot] = ec;
 961
 962         rc = device_register(&ec->dev);
 963         if (rc)
 964                 goto nodev;
 965
 966         return 0;
 967
 968  nodev:
 969         ecard_free_card(ec);
 970  nomem:
 971         return rc;
 972 }
 973
 974 /*
 975  * Initialise the expansion card system.
 976  * Locate all hardware - interrupt management and
 977  * actual cards.
 978  */
 979 static int __init ecard_init(void)
 980 {
 981         struct task_struct *task;
 982         int slot, irqbase;
 983
 984         irqbase = irq_alloc_descs(-1, 0, 8, -1);
 985         if (irqbase < 0)
 986                 return irqbase;
 987
 988         task = kthread_run(ecard_task, NULL, "kecardd");
 989         if (IS_ERR(task)) {
 990                 printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
 991                        PTR_ERR(task));
 992                 irq_free_descs(irqbase, 8);
 993                 return PTR_ERR(task);
 994         }
 995
 996         printk("Probing expansion cards\n");
 997
 998         for (slot = 0; slot < 8; slot ++) {
 999                 if (ecard_probe(slot, irqbase + slot, ECARD_EASI) == -ENODEV)
1000                         ecard_probe(slot, irqbase + slot, ECARD_IOC);
1001         }
1002
1003         ecard_probe(8, 11, ECARD_IOC);
1004
1005         irq_set_chained_handler(IRQ_EXPANSIONCARD, ecard_irq_handler);
1006
1007         ecard_proc_init();
1008
1009         return 0;
1010 }
1011
1012 subsys_initcall(ecard_init);
1013
1014 /*
1015  *      ECARD "bus"
1016  */
1017 static const struct ecard_id *
1018 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1019 {
1020         int i;
1021
1022         for (i = 0; ids[i].manufacturer != 65535; i++)
1023                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1024                     ec->cid.product == ids[i].product)
1025                         return ids + i;
1026
1027         return NULL;
1028 }
1029
1030 static int ecard_drv_probe(struct device *dev)
1031 {
1032         struct expansion_card *ec = ECARD_DEV(dev);
1033         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1034         const struct ecard_id *id;
1035         int ret;
1036
1037         id = ecard_match_device(drv->id_table, ec);
1038
1039         ec->claimed = 1;
1040         ret = drv->probe(ec, id);
1041         if (ret)
1042                 ec->claimed = 0;
1043         return ret;
1044 }
1045
1046 static int ecard_drv_remove(struct device *dev)
1047 {
1048         struct expansion_card *ec = ECARD_DEV(dev);
1049         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1050
1051         drv->remove(ec);
1052         ec->claimed = 0;
1053
1054         /*
1055          * Restore the default operations.  We ensure that the
1056          * ops are set before we change the data.
1057          */
1058         ec->ops = &ecard_default_ops;
1059         barrier();
1060         ec->irq_data = NULL;
1061
1062         return 0;
1063 }
1064
1065 /*
1066  * Before rebooting, we must make sure that the expansion card is in a
1067  * sensible state, so it can be re-detected.  This means that the first
1068  * page of the ROM must be visible.  We call the expansion cards reset
1069  * handler, if any.
1070  */
1071 static void ecard_drv_shutdown(struct device *dev)
1072 {
1073         struct expansion_card *ec = ECARD_DEV(dev);
1074         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1075         struct ecard_request req;
1076
1077         if (dev->driver) {
1078                 if (drv->shutdown)
1079                         drv->shutdown(ec);
1080                 ec->claimed = 0;
1081         }
1082
1083         /*
1084          * If this card has a loader, call the reset handler.
1085          */
1086         if (ec->loader) {
1087                 req.fn = ecard_task_reset;
1088                 req.ec = ec;
1089                 ecard_call(&req);
1090         }
1091 }
1092
1093 int ecard_register_driver(struct ecard_driver *drv)
1094 {
1095         drv->drv.bus = &ecard_bus_type;
1096
1097         return driver_register(&drv->drv);
1098 }
1099
1100 void ecard_remove_driver(struct ecard_driver *drv)
1101 {
1102         driver_unregister(&drv->drv);
1103 }
1104
1105 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1106 {
1107         struct expansion_card *ec = ECARD_DEV(_dev);
1108         struct ecard_driver *drv = ECARD_DRV(_drv);
1109         int ret;
1110
1111         if (drv->id_table) {
1112                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1113         } else {
1114                 ret = ec->cid.id == drv->id;
1115         }
1116
1117         return ret;
1118 }
1119
1120 struct bus_type ecard_bus_type = {
1121         .name           = "ecard",
1122         .dev_attrs      = ecard_dev_attrs,
1123         .match          = ecard_match,
1124         .probe          = ecard_drv_probe,
1125         .remove         = ecard_drv_remove,
1126         .shutdown       = ecard_drv_shutdown,
1127 };
1128
1129 static int ecard_bus_init(void)
1130 {
1131         return bus_register(&ecard_bus_type);
1132 }
1133
1134 postcore_initcall(ecard_bus_init);
1135
1136 EXPORT_SYMBOL(ecard_readchunk);
1137 EXPORT_SYMBOL(ecard_register_driver);
1138 EXPORT_SYMBOL(ecard_remove_driver);
1139 EXPORT_SYMBOL(ecard_bus_type);