arch/arm/mach-rpc/ecard.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/arch/arm/kernel/ecard.c
   4  *
   5  *  Copyright 1995-2001 Russell King
   6  *
   7  *  Find all installed expansion cards, and handle interrupts from them.
   8  *
   9  *  Created from information from Acorns RiscOS3 PRMs
  10  *
  11  *  08-Dec-1996 RMK     Added code for the 9'th expansion card - the ether
  12  *                      podule slot.
  13  *  06-May-1997 RMK     Added blacklist for cards whose loader doesn't work.
  14  *  12-Sep-1997 RMK     Created new handling of interrupt enables/disables
  15  *                      - cards can now register their own routine to control
  16  *                      interrupts (recommended).
  17  *  29-Sep-1997 RMK     Expansion card interrupt hardware not being re-enabled
  18  *                      on reset from Linux. (Caused cards not to respond
  19  *                      under RiscOS without hard reset).
  20  *  15-Feb-1998 RMK     Added DMA support
  21  *  12-Sep-1998 RMK     Added EASI support
  22  *  10-Jan-1999 RMK     Run loaders in a simulated RISC OS environment.
  23  *  17-Apr-1999 RMK     Support for EASI Type C cycles.
  24  */
  25 #define ECARD_C
  26
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/types.h>
  30 #include <linux/sched.h>
  31 #include <linux/sched/mm.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/completion.h>
  34 #include <linux/reboot.h>
  35 #include <linux/mm.h>
  36 #include <linux/slab.h>
  37 #include <linux/proc_fs.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/device.h>
  40 #include <linux/init.h>
  41 #include <linux/mutex.h>
  42 #include <linux/kthread.h>
  43 #include <linux/irq.h>
  44 #include <linux/io.h>
  45
  46 #include <asm/dma.h>
  47 #include <asm/ecard.h>
  48 #include <mach/hardware.h>
  49 #include <asm/irq.h>
  50 #include <asm/mmu_context.h>
  51 #include <asm/mach/irq.h>
  52 #include <asm/tlbflush.h>
  53
  54 #include "ecard.h"
  55
  56 struct ecard_request {
  57         void            (*fn)(struct ecard_request *);
  58         ecard_t         *ec;
  59         unsigned int    address;
  60         unsigned int    length;
  61         unsigned int    use_loader;
  62         void            *buffer;
  63         struct completion *complete;
  64 };
  65
  66 struct expcard_quirklist {
  67         unsigned short   manufacturer;
  68         unsigned short   product;
  69         const char      *type;
  70         void (*init)(ecard_t *ec);
  71 };
  72
  73 static ecard_t *cards;
  74 static ecard_t *slot_to_expcard[MAX_ECARDS];
  75 static unsigned int ectcr;
  76
  77 static void atomwide_3p_quirk(ecard_t *ec);
  78
  79 /* List of descriptions of cards which don't have an extended
  80  * identification, or chunk directories containing a description.
  81  */
  82 static struct expcard_quirklist quirklist[] __initdata = {
  83         { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" },
  84         { MANU_ATOMWIDE, PROD_ATOMWIDE_3PSERIAL, NULL, atomwide_3p_quirk },
  85 };
  86
  87 asmlinkage extern int
  88 ecard_loader_reset(unsigned long base, loader_t loader);
  89 asmlinkage extern int
  90 ecard_loader_read(int off, unsigned long base, loader_t loader);
  91
  92 static inline unsigned short ecard_getu16(unsigned char *v)
  93 {
  94         return v[0] | v[1] << 8;
  95 }
  96
  97 static inline signed long ecard_gets24(unsigned char *v)
  98 {
  99         return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
 100 }
 101
 102 static inline ecard_t *slot_to_ecard(unsigned int slot)
 103 {
 104         return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
 105 }
 106
 107 /* ===================== Expansion card daemon ======================== */
 108 /*
 109  * Since the loader programs on the expansion cards need to be run
 110  * in a specific environment, create a separate task with this
 111  * environment up, and pass requests to this task as and when we
 112  * need to.
 113  *
 114  * This should allow 99% of loaders to be called from Linux.
 115  *
 116  * From a security standpoint, we trust the card vendors.  This
 117  * may be a misplaced trust.
 118  */
 119 static void ecard_task_reset(struct ecard_request *req)
 120 {
 121         struct expansion_card *ec = req->ec;
 122         struct resource *res;
 123
 124         res = ec->slot_no == 8
 125                 ? &ec->resource[ECARD_RES_MEMC]
 126                 : ec->easi
 127                   ? &ec->resource[ECARD_RES_EASI]
 128                   : &ec->resource[ECARD_RES_IOCSYNC];
 129
 130         ecard_loader_reset(res->start, ec->loader);
 131 }
 132
 133 static void ecard_task_readbytes(struct ecard_request *req)
 134 {
 135         struct expansion_card *ec = req->ec;
 136         unsigned char *buf = req->buffer;
 137         unsigned int len = req->length;
 138         unsigned int off = req->address;
 139
 140         if (ec->slot_no == 8) {
 141                 void __iomem *base = (void __iomem *)
 142                                 ec->resource[ECARD_RES_MEMC].start;
 143
 144                 /*
 145                  * The card maintains an index which increments the address
 146                  * into a 4096-byte page on each access.  We need to keep
 147                  * track of the counter.
 148                  */
 149                 static unsigned int index;
 150                 unsigned int page;
 151
 152                 page = (off >> 12) * 4;
 153                 if (page > 256 * 4)
 154                         return;
 155
 156                 off &= 4095;
 157
 158                 /*
 159                  * If we are reading offset 0, or our current index is
 160                  * greater than the offset, reset the hardware index counter.
 161                  */
 162                 if (off == 0 || index > off) {
 163                         writeb(0, base);
 164                         index = 0;
 165                 }
 166
 167                 /*
 168                  * Increment the hardware index counter until we get to the
 169                  * required offset.  The read bytes are discarded.
 170                  */
 171                 while (index < off) {
 172                         readb(base + page);
 173                         index += 1;
 174                 }
 175
 176                 while (len--) {
 177                         *buf++ = readb(base + page);
 178                         index += 1;
 179                 }
 180         } else {
 181                 unsigned long base = (ec->easi
 182                          ? &ec->resource[ECARD_RES_EASI]
 183                          : &ec->resource[ECARD_RES_IOCSYNC])->start;
 184                 void __iomem *pbase = (void __iomem *)base;
 185
 186                 if (!req->use_loader || !ec->loader) {
 187                         off *= 4;
 188                         while (len--) {
 189                                 *buf++ = readb(pbase + off);
 190                                 off += 4;
 191                         }
 192                 } else {
 193                         while(len--) {
 194                                 /*
 195                                  * The following is required by some
 196                                  * expansion card loader programs.
 197                                  */
 198                                 *(unsigned long *)0x108 = 0;
 199                                 *buf++ = ecard_loader_read(off++, base,
 200                                                            ec->loader);
 201                         }
 202                 }
 203         }
 204
 205 }
 206
 207 static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
 208 static struct ecard_request *ecard_req;
 209 static DEFINE_MUTEX(ecard_mutex);
 210
 211 /*
 212  * Set up the expansion card daemon's page tables.
 213  */
 214 static void ecard_init_pgtables(struct mm_struct *mm)
 215 {
 216         struct vm_area_struct vma = TLB_FLUSH_VMA(mm, VM_EXEC);
 217
 218         /* We want to set up the page tables for the following mapping:
 219          *  Virtual     Physical
 220          *  0x03000000  0x03000000
 221          *  0x03010000  unmapped
 222          *  0x03210000  0x03210000
 223          *  0x03400000  unmapped
 224          *  0x08000000  0x08000000
 225          *  0x10000000  unmapped
 226          *
 227          * FIXME: we don't follow this 100% yet.
 228          */
 229         pgd_t *src_pgd, *dst_pgd;
 230
 231         src_pgd = pgd_offset(mm, (unsigned long)IO_BASE);
 232         dst_pgd = pgd_offset(mm, IO_START);
 233
 234         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));
 235
 236         src_pgd = pgd_offset(mm, (unsigned long)EASI_BASE);
 237         dst_pgd = pgd_offset(mm, EASI_START);
 238
 239         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));
 240
 241         flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
 242         flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
 243 }
 244
 245 static int ecard_init_mm(void)
 246 {
 247         struct mm_struct * mm = mm_alloc();
 248         struct mm_struct *active_mm = current->active_mm;
 249
 250         if (!mm)
 251                 return -ENOMEM;
 252
 253         current->mm = mm;
 254         current->active_mm = mm;
 255         activate_mm(active_mm, mm);
 256         mmdrop(active_mm);
 257         ecard_init_pgtables(mm);
 258         return 0;
 259 }
 260
 261 static int
 262 ecard_task(void * unused)
 263 {
 264         /*
 265          * Allocate a mm.  We're not a lazy-TLB kernel task since we need
 266          * to set page table entries where the user space would be.  Note
 267          * that this also creates the page tables.  Failure is not an
 268          * option here.
 269          */
 270         if (ecard_init_mm())
 271                 panic("kecardd: unable to alloc mm\n");
 272
 273         while (1) {
 274                 struct ecard_request *req;
 275
 276                 wait_event_interruptible(ecard_wait, ecard_req != NULL);
 277
 278                 req = xchg(&ecard_req, NULL);
 279                 if (req != NULL) {
 280                         req->fn(req);
 281                         complete(req->complete);
 282                 }
 283         }
 284 }
 285
 286 /*
 287  * Wake the expansion card daemon to action our request.
 288  *
 289  * FIXME: The test here is not sufficient to detect if the
 290  * kcardd is running.
 291  */
 292 static void ecard_call(struct ecard_request *req)
 293 {
 294         DECLARE_COMPLETION_ONSTACK(completion);
 295
 296         req->complete = &completion;
 297
 298         mutex_lock(&ecard_mutex);
 299         ecard_req = req;
 300         wake_up(&ecard_wait);
 301
 302         /*
 303          * Now wait for kecardd to run.
 304          */
 305         wait_for_completion(&completion);
 306         mutex_unlock(&ecard_mutex);
 307 }
 308
 309 /* ======================= Mid-level card control ===================== */
 310
 311 static void
 312 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
 313 {
 314         struct ecard_request req;
 315
 316         req.fn          = ecard_task_readbytes;
 317         req.ec          = ec;
 318         req.address     = off;
 319         req.length      = len;
 320         req.use_loader  = useld;
 321         req.buffer      = addr;
 322
 323         ecard_call(&req);
 324 }
 325
 326 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
 327 {
 328         struct ex_chunk_dir excd;
 329         int index = 16;
 330         int useld = 0;
 331
 332         if (!ec->cid.cd)
 333                 return 0;
 334
 335         while(1) {
 336                 ecard_readbytes(&excd, ec, index, 8, useld);
 337                 index += 8;
 338                 if (c_id(&excd) == 0) {
 339                         if (!useld && ec->loader) {
 340                                 useld = 1;
 341                                 index = 0;
 342                                 continue;
 343                         }
 344                         return 0;
 345                 }
 346                 if (c_id(&excd) == 0xf0) { /* link */
 347                         index = c_start(&excd);
 348                         continue;
 349                 }
 350                 if (c_id(&excd) == 0x80) { /* loader */
 351                         if (!ec->loader) {
 352                                 ec->loader = kmalloc(c_len(&excd),
 353                                                                GFP_KERNEL);
 354                                 if (ec->loader)
 355                                         ecard_readbytes(ec->loader, ec,
 356                                                         (int)c_start(&excd),
 357                                                         c_len(&excd), useld);
 358                                 else
 359                                         return 0;
 360                         }
 361                         continue;
 362                 }
 363                 if (c_id(&excd) == id && num-- == 0)
 364                         break;
 365         }
 366
 367         if (c_id(&excd) & 0x80) {
 368                 switch (c_id(&excd) & 0x70) {
 369                 case 0x70:
 370                         ecard_readbytes((unsigned char *)excd.d.string, ec,
 371                                         (int)c_start(&excd), c_len(&excd),
 372                                         useld);
 373                         break;
 374                 case 0x00:
 375                         break;
 376                 }
 377         }
 378         cd->start_offset = c_start(&excd);
 379         memcpy(cd->d.string, excd.d.string, 256);
 380         return 1;
 381 }
 382
 383 /* ======================= Interrupt control ============================ */
 384
 385 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 386 {
 387 }
 388
 389 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 390 {
 391 }
 392
 393 static int ecard_def_irq_pending(ecard_t *ec)
 394 {
 395         return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
 396 }
 397
 398 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 399 {
 400         panic("ecard_def_fiq_enable called - impossible");
 401 }
 402
 403 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 404 {
 405         panic("ecard_def_fiq_disable called - impossible");
 406 }
 407
 408 static int ecard_def_fiq_pending(ecard_t *ec)
 409 {
 410         return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
 411 }
 412
 413 static expansioncard_ops_t ecard_default_ops = {
 414         ecard_def_irq_enable,
 415         ecard_def_irq_disable,
 416         ecard_def_irq_pending,
 417         ecard_def_fiq_enable,
 418         ecard_def_fiq_disable,
 419         ecard_def_fiq_pending
 420 };
 421
 422 /*
 423  * Enable and disable interrupts from expansion cards.
 424  * (interrupts are disabled for these functions).
 425  *
 426  * They are not meant to be called directly, but via enable/disable_irq.
 427  */
 428 static void ecard_irq_unmask(struct irq_data *d)
 429 {
 430         ecard_t *ec = irq_data_get_irq_chip_data(d);
 431
 432         if (ec) {
 433                 if (!ec->ops)
 434                         ec->ops = &ecard_default_ops;
 435
 436                 if (ec->claimed && ec->ops->irqenable)
 437                         ec->ops->irqenable(ec, d->irq);
 438                 else
 439                         printk(KERN_ERR "ecard: rejecting request to "
 440                                 "enable IRQs for %d\n", d->irq);
 441         }
 442 }
 443
 444 static void ecard_irq_mask(struct irq_data *d)
 445 {
 446         ecard_t *ec = irq_data_get_irq_chip_data(d);
 447
 448         if (ec) {
 449                 if (!ec->ops)
 450                         ec->ops = &ecard_default_ops;
 451
 452                 if (ec->ops && ec->ops->irqdisable)
 453                         ec->ops->irqdisable(ec, d->irq);
 454         }
 455 }
 456
 457 static struct irq_chip ecard_chip = {
 458         .name           = "ECARD",
 459         .irq_ack        = ecard_irq_mask,
 460         .irq_mask       = ecard_irq_mask,
 461         .irq_unmask     = ecard_irq_unmask,
 462 };
 463
 464 void ecard_enablefiq(unsigned int fiqnr)
 465 {
 466         ecard_t *ec = slot_to_ecard(fiqnr);
 467
 468         if (ec) {
 469                 if (!ec->ops)
 470                         ec->ops = &ecard_default_ops;
 471
 472                 if (ec->claimed && ec->ops->fiqenable)
 473                         ec->ops->fiqenable(ec, fiqnr);
 474                 else
 475                         printk(KERN_ERR "ecard: rejecting request to "
 476                                 "enable FIQs for %d\n", fiqnr);
 477         }
 478 }
 479
 480 void ecard_disablefiq(unsigned int fiqnr)
 481 {
 482         ecard_t *ec = slot_to_ecard(fiqnr);
 483
 484         if (ec) {
 485                 if (!ec->ops)
 486                         ec->ops = &ecard_default_ops;
 487
 488                 if (ec->ops->fiqdisable)
 489                         ec->ops->fiqdisable(ec, fiqnr);
 490         }
 491 }
 492
 493 static void ecard_dump_irq_state(void)
 494 {
 495         ecard_t *ec;
 496
 497         printk("Expansion card IRQ state:\n");
 498
 499         for (ec = cards; ec; ec = ec->next) {
 500                 const char *claimed;
 501
 502                 if (ec->slot_no == 8)
 503                         continue;
 504
 505                 claimed = ec->claimed ? "" : "not ";
 506
 507                 if (ec->ops && ec->ops->irqpending &&
 508                     ec->ops != &ecard_default_ops)
 509                         printk("  %d: %sclaimed irq %spending\n",
 510                                ec->slot_no, claimed,
 511                                ec->ops->irqpending(ec) ? "" : "not ");
 512                 else
 513                         printk("  %d: %sclaimed irqaddr %p, mask = %02X, status = %02X\n",
 514                                ec->slot_no, claimed,
 515                                ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
 516         }
 517 }
 518
 519 static void ecard_check_lockup(struct irq_desc *desc)
 520 {
 521         static unsigned long last;
 522         static int lockup;
 523
 524         /*
 525          * If the timer interrupt has not run since the last million
 526          * unrecognised expansion card interrupts, then there is
 527          * something seriously wrong.  Disable the expansion card
 528          * interrupts so at least we can continue.
 529          *
 530          * Maybe we ought to start a timer to re-enable them some time
 531          * later?
 532          */
 533         if (last == jiffies) {
 534                 lockup += 1;
 535                 if (lockup > 1000000) {
 536                         printk(KERN_ERR "\nInterrupt lockup detected - "
 537                                "disabling all expansion card interrupts\n");
 538
 539                         desc->irq_data.chip->irq_mask(&desc->irq_data);
 540                         ecard_dump_irq_state();
 541                 }
 542         } else
 543                 lockup = 0;
 544
 545         /*
 546          * If we did not recognise the source of this interrupt,
 547          * warn the user, but don't flood the user with these messages.
 548          */
 549         if (!last || time_after(jiffies, last + 5*HZ)) {
 550                 last = jiffies;
 551                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 552                 ecard_dump_irq_state();
 553         }
 554 }
 555
 556 static void ecard_irq_handler(struct irq_desc *desc)
 557 {
 558         ecard_t *ec;
 559         int called = 0;
 560
 561         desc->irq_data.chip->irq_mask(&desc->irq_data);
 562         for (ec = cards; ec; ec = ec->next) {
 563                 int pending;
 564
 565                 if (!ec->claimed || !ec->irq || ec->slot_no == 8)
 566                         continue;
 567
 568                 if (ec->ops && ec->ops->irqpending)
 569                         pending = ec->ops->irqpending(ec);
 570                 else
 571                         pending = ecard_default_ops.irqpending(ec);
 572
 573                 if (pending) {
 574                         generic_handle_irq(ec->irq);
 575                         called ++;
 576                 }
 577         }
 578         desc->irq_data.chip->irq_unmask(&desc->irq_data);
 579
 580         if (called == 0)
 581                 ecard_check_lockup(desc);
 582 }
 583
 584 static void __iomem *__ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 585 {
 586         void __iomem *address = NULL;
 587         int slot = ec->slot_no;
 588
 589         if (ec->slot_no == 8)
 590                 return ECARD_MEMC8_BASE;
 591
 592         ectcr &= ~(1 << slot);
 593
 594         switch (type) {
 595         case ECARD_MEMC:
 596                 if (slot < 4)
 597                         address = ECARD_MEMC_BASE + (slot << 14);
 598                 break;
 599
 600         case ECARD_IOC:
 601                 if (slot < 4)
 602                         address = ECARD_IOC_BASE + (slot << 14);
 603                 else
 604                         address = ECARD_IOC4_BASE + ((slot - 4) << 14);
 605                 if (address)
 606                         address += speed << 19;
 607                 break;
 608
 609         case ECARD_EASI:
 610                 address = ECARD_EASI_BASE + (slot << 24);
 611                 if (speed == ECARD_FAST)
 612                         ectcr |= 1 << slot;
 613                 break;
 614
 615         default:
 616                 break;
 617         }
 618
 619 #ifdef IOMD_ECTCR
 620         iomd_writeb(ectcr, IOMD_ECTCR);
 621 #endif
 622         return address;
 623 }
 624
 625 static int ecard_prints(struct seq_file *m, ecard_t *ec)
 626 {
 627         seq_printf(m, "  %d: %s ", ec->slot_no, ec->easi ? "EASI" : "    ");
 628
 629         if (ec->cid.id == 0) {
 630                 struct in_chunk_dir incd;
 631
 632                 seq_printf(m, "[%04X:%04X] ",
 633                         ec->cid.manufacturer, ec->cid.product);
 634
 635                 if (!ec->card_desc && ec->cid.cd &&
 636                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 637                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 638
 639                         if (ec->card_desc)
 640                                 strcpy((char *)ec->card_desc, incd.d.string);
 641                 }
 642
 643                 seq_printf(m, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 644         } else
 645                 seq_printf(m, "Simple card %d\n", ec->cid.id);
 646
 647         return 0;
 648 }
 649
 650 static int ecard_devices_proc_show(struct seq_file *m, void *v)
 651 {
 652         ecard_t *ec = cards;
 653
 654         while (ec) {
 655                 ecard_prints(m, ec);
 656                 ec = ec->next;
 657         }
 658         return 0;
 659 }
 660
 661 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 662
 663 static void ecard_proc_init(void)
 664 {
 665         proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL);
 666         proc_create_single("devices", 0, proc_bus_ecard_dir,
 667                         ecard_devices_proc_show);
 668 }
 669
 670 #define ec_set_resource(ec,nr,st,sz)                            \
 671         do {                                                    \
 672                 (ec)->resource[nr].name = dev_name(&ec->dev);   \
 673                 (ec)->resource[nr].start = st;                  \
 674                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 675                 (ec)->resource[nr].flags = IORESOURCE_MEM;      \
 676         } while (0)
 677
 678 static void __init ecard_free_card(struct expansion_card *ec)
 679 {
 680         int i;
 681
 682         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 683                 if (ec->resource[i].flags)
 684                         release_resource(&ec->resource[i]);
 685
 686         kfree(ec);
 687 }
 688
 689 static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 690 {
 691         struct expansion_card *ec;
 692         unsigned long base;
 693         int i;
 694
 695         ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
 696         if (!ec) {
 697                 ec = ERR_PTR(-ENOMEM);
 698                 goto nomem;
 699         }
 700
 701         ec->slot_no = slot;
 702         ec->easi = type == ECARD_EASI;
 703         ec->irq = 0;
 704         ec->fiq = 0;
 705         ec->dma = NO_DMA;
 706         ec->ops = &ecard_default_ops;
 707
 708         dev_set_name(&ec->dev, "ecard%d", slot);
 709         ec->dev.parent = NULL;
 710         ec->dev.bus = &ecard_bus_type;
 711         ec->dev.dma_mask = &ec->dma_mask;
 712         ec->dma_mask = (u64)0xffffffff;
 713         ec->dev.coherent_dma_mask = ec->dma_mask;
 714
 715         if (slot < 4) {
 716                 ec_set_resource(ec, ECARD_RES_MEMC,
 717                                 PODSLOT_MEMC_BASE + (slot << 14),
 718                                 PODSLOT_MEMC_SIZE);
 719                 base = PODSLOT_IOC0_BASE + (slot << 14);
 720         } else
 721                 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
 722
 723 #ifdef CONFIG_ARCH_RPC
 724         if (slot < 8) {
 725                 ec_set_resource(ec, ECARD_RES_EASI,
 726                                 PODSLOT_EASI_BASE + (slot << 24),
 727                                 PODSLOT_EASI_SIZE);
 728         }
 729
 730         if (slot == 8) {
 731                 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
 732         } else
 733 #endif
 734
 735         for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
 736                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 737                                 base + (i << 19), PODSLOT_IOC_SIZE);
 738
 739         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 740                 if (ec->resource[i].flags &&
 741                     request_resource(&iomem_resource, &ec->resource[i])) {
 742                         dev_err(&ec->dev, "resource(s) not available\n");
 743                         ec->resource[i].end -= ec->resource[i].start;
 744                         ec->resource[i].start = 0;
 745                         ec->resource[i].flags = 0;
 746                 }
 747         }
 748
 749  nomem:
 750         return ec;
 751 }
 752
 753 static ssize_t irq_show(struct device *dev, struct device_attribute *attr, char *buf)
 754 {
 755         struct expansion_card *ec = ECARD_DEV(dev);
 756         return sprintf(buf, "%u\n", ec->irq);
 757 }
 758 static DEVICE_ATTR_RO(irq);
 759
 760 static ssize_t dma_show(struct device *dev, struct device_attribute *attr, char *buf)
 761 {
 762         struct expansion_card *ec = ECARD_DEV(dev);
 763         return sprintf(buf, "%u\n", ec->dma);
 764 }
 765 static DEVICE_ATTR_RO(dma);
 766
 767 static ssize_t resource_show(struct device *dev, struct device_attribute *attr, char *buf)
 768 {
 769         struct expansion_card *ec = ECARD_DEV(dev);
 770         char *str = buf;
 771         int i;
 772
 773         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 774                 str += sprintf(str, "%08x %08x %08lx\n",
 775                                 ec->resource[i].start,
 776                                 ec->resource[i].end,
 777                                 ec->resource[i].flags);
 778
 779         return str - buf;
 780 }
 781 static DEVICE_ATTR_RO(resource);
 782
 783 static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
 784 {
 785         struct expansion_card *ec = ECARD_DEV(dev);
 786         return sprintf(buf, "%u\n", ec->cid.manufacturer);
 787 }
 788 static DEVICE_ATTR_RO(vendor);
 789
 790 static ssize_t device_show(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.product);
 794 }
 795 static DEVICE_ATTR_RO(device);
 796
 797 static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf)
 798 {
 799         struct expansion_card *ec = ECARD_DEV(dev);
 800         return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
 801 }
 802 static DEVICE_ATTR_RO(type);
 803
 804 static struct attribute *ecard_dev_attrs[] = {
 805         &dev_attr_device.attr,
 806         &dev_attr_dma.attr,
 807         &dev_attr_irq.attr,
 808         &dev_attr_resource.attr,
 809         &dev_attr_type.attr,
 810         &dev_attr_vendor.attr,
 811         NULL,
 812 };
 813 ATTRIBUTE_GROUPS(ecard_dev);
 814
 815 int ecard_request_resources(struct expansion_card *ec)
 816 {
 817         int i, err = 0;
 818
 819         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 820                 if (ecard_resource_end(ec, i) &&
 821                     !request_mem_region(ecard_resource_start(ec, i),
 822                                         ecard_resource_len(ec, i),
 823                                         ec->dev.driver->name)) {
 824                         err = -EBUSY;
 825                         break;
 826                 }
 827         }
 828
 829         if (err) {
 830                 while (i--)
 831                         if (ecard_resource_end(ec, i))
 832                                 release_mem_region(ecard_resource_start(ec, i),
 833                                                    ecard_resource_len(ec, i));
 834         }
 835         return err;
 836 }
 837 EXPORT_SYMBOL(ecard_request_resources);
 838
 839 void ecard_release_resources(struct expansion_card *ec)
 840 {
 841         int i;
 842
 843         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 844                 if (ecard_resource_end(ec, i))
 845                         release_mem_region(ecard_resource_start(ec, i),
 846                                            ecard_resource_len(ec, i));
 847 }
 848 EXPORT_SYMBOL(ecard_release_resources);
 849
 850 void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
 851 {
 852         ec->irq_data = irq_data;
 853         barrier();
 854         ec->ops = ops;
 855 }
 856 EXPORT_SYMBOL(ecard_setirq);
 857
 858 void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
 859                            unsigned long offset, unsigned long maxsize)
 860 {
 861         unsigned long start = ecard_resource_start(ec, res);
 862         unsigned long end = ecard_resource_end(ec, res);
 863
 864         if (offset > (end - start))
 865                 return NULL;
 866
 867         start += offset;
 868         if (maxsize && end - start > maxsize)
 869                 end = start + maxsize;
 870
 871         return devm_ioremap(&ec->dev, start, end - start);
 872 }
 873 EXPORT_SYMBOL(ecardm_iomap);
 874
 875 static void atomwide_3p_quirk(ecard_t *ec)
 876 {
 877         void __iomem *addr = __ecard_address(ec, ECARD_IOC, ECARD_SYNC);
 878         unsigned int i;
 879
 880         /* Disable interrupts on each port */
 881         for (i = 0x2000; i <= 0x2800; i += 0x0400)
 882                 writeb(0, addr + i + 4);
 883 }
 884
 885 /*
 886  * Probe for an expansion card.
 887  *
 888  * If bit 1 of the first byte of the card is set, then the
 889  * card does not exist.
 890  */
 891 static int __init ecard_probe(int slot, unsigned irq, card_type_t type)
 892 {
 893         ecard_t **ecp;
 894         ecard_t *ec;
 895         struct ex_ecid cid;
 896         void __iomem *addr;
 897         int i, rc;
 898
 899         ec = ecard_alloc_card(type, slot);
 900         if (IS_ERR(ec)) {
 901                 rc = PTR_ERR(ec);
 902                 goto nomem;
 903         }
 904
 905         rc = -ENODEV;
 906         if ((addr = __ecard_address(ec, type, ECARD_SYNC)) == NULL)
 907                 goto nodev;
 908
 909         cid.r_zero = 1;
 910         ecard_readbytes(&cid, ec, 0, 16, 0);
 911         if (cid.r_zero)
 912                 goto nodev;
 913
 914         ec->cid.id      = cid.r_id;
 915         ec->cid.cd      = cid.r_cd;
 916         ec->cid.is      = cid.r_is;
 917         ec->cid.w       = cid.r_w;
 918         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
 919         ec->cid.product = ecard_getu16(cid.r_prod);
 920         ec->cid.country = cid.r_country;
 921         ec->cid.irqmask = cid.r_irqmask;
 922         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
 923         ec->cid.fiqmask = cid.r_fiqmask;
 924         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
 925         ec->fiqaddr     =
 926         ec->irqaddr     = addr;
 927
 928         if (ec->cid.is) {
 929                 ec->irqmask = ec->cid.irqmask;
 930                 ec->irqaddr += ec->cid.irqoff;
 931                 ec->fiqmask = ec->cid.fiqmask;
 932                 ec->fiqaddr += ec->cid.fiqoff;
 933         } else {
 934                 ec->irqmask = 1;
 935                 ec->fiqmask = 4;
 936         }
 937
 938         for (i = 0; i < ARRAY_SIZE(quirklist); i++)
 939                 if (quirklist[i].manufacturer == ec->cid.manufacturer &&
 940                     quirklist[i].product == ec->cid.product) {
 941                         if (quirklist[i].type)
 942                                 ec->card_desc = quirklist[i].type;
 943                         if (quirklist[i].init)
 944                                 quirklist[i].init(ec);
 945                         break;
 946                 }
 947
 948         ec->irq = irq;
 949
 950         /*
 951          * hook the interrupt handlers
 952          */
 953         if (slot < 8) {
 954                 irq_set_chip_and_handler(ec->irq, &ecard_chip,
 955                                          handle_level_irq);
 956                 irq_set_chip_data(ec->irq, ec);
 957                 irq_clear_status_flags(ec->irq, IRQ_NOREQUEST);
 958         }
 959
 960 #ifdef CONFIG_ARCH_RPC
 961         /* On RiscPC, only first two slots have DMA capability */
 962         if (slot < 2)
 963                 ec->dma = 2 + slot;
 964 #endif
 965
 966         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
 967
 968         *ecp = ec;
 969         slot_to_expcard[slot] = ec;
 970
 971         rc = device_register(&ec->dev);
 972         if (rc)
 973                 goto nodev;
 974
 975         return 0;
 976
 977  nodev:
 978         ecard_free_card(ec);
 979  nomem:
 980         return rc;
 981 }
 982
 983 /*
 984  * Initialise the expansion card system.
 985  * Locate all hardware - interrupt management and
 986  * actual cards.
 987  */
 988 static int __init ecard_init(void)
 989 {
 990         struct task_struct *task;
 991         int slot, irqbase;
 992
 993         irqbase = irq_alloc_descs(-1, 0, 8, -1);
 994         if (irqbase < 0)
 995                 return irqbase;
 996
 997         task = kthread_run(ecard_task, NULL, "kecardd");
 998         if (IS_ERR(task)) {
 999                 printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
1000                        PTR_ERR(task));
1001                 irq_free_descs(irqbase, 8);
1002                 return PTR_ERR(task);
1003         }
1004
1005         printk("Probing expansion cards\n");
1006
1007         for (slot = 0; slot < 8; slot ++) {
1008                 if (ecard_probe(slot, irqbase + slot, ECARD_EASI) == -ENODEV)
1009                         ecard_probe(slot, irqbase + slot, ECARD_IOC);
1010         }
1011
1012         ecard_probe(8, 11, ECARD_IOC);
1013
1014         irq_set_chained_handler(IRQ_EXPANSIONCARD, ecard_irq_handler);
1015
1016         ecard_proc_init();
1017
1018         return 0;
1019 }
1020
1021 subsys_initcall(ecard_init);
1022
1023 /*
1024  *      ECARD "bus"
1025  */
1026 static const struct ecard_id *
1027 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1028 {
1029         int i;
1030
1031         for (i = 0; ids[i].manufacturer != 65535; i++)
1032                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1033                     ec->cid.product == ids[i].product)
1034                         return ids + i;
1035
1036         return NULL;
1037 }
1038
1039 static int ecard_drv_probe(struct device *dev)
1040 {
1041         struct expansion_card *ec = ECARD_DEV(dev);
1042         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1043         const struct ecard_id *id;
1044         int ret;
1045
1046         id = ecard_match_device(drv->id_table, ec);
1047
1048         ec->claimed = 1;
1049         ret = drv->probe(ec, id);
1050         if (ret)
1051                 ec->claimed = 0;
1052         return ret;
1053 }
1054
1055 static void ecard_drv_remove(struct device *dev)
1056 {
1057         struct expansion_card *ec = ECARD_DEV(dev);
1058         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1059
1060         drv->remove(ec);
1061         ec->claimed = 0;
1062
1063         /*
1064          * Restore the default operations.  We ensure that the
1065          * ops are set before we change the data.
1066          */
1067         ec->ops = &ecard_default_ops;
1068         barrier();
1069         ec->irq_data = NULL;
1070 }
1071
1072 /*
1073  * Before rebooting, we must make sure that the expansion card is in a
1074  * sensible state, so it can be re-detected.  This means that the first
1075  * page of the ROM must be visible.  We call the expansion cards reset
1076  * handler, if any.
1077  */
1078 static void ecard_drv_shutdown(struct device *dev)
1079 {
1080         struct expansion_card *ec = ECARD_DEV(dev);
1081         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1082         struct ecard_request req;
1083
1084         if (dev->driver) {
1085                 if (drv->shutdown)
1086                         drv->shutdown(ec);
1087                 ec->claimed = 0;
1088         }
1089
1090         /*
1091          * If this card has a loader, call the reset handler.
1092          */
1093         if (ec->loader) {
1094                 req.fn = ecard_task_reset;
1095                 req.ec = ec;
1096                 ecard_call(&req);
1097         }
1098 }
1099
1100 int ecard_register_driver(struct ecard_driver *drv)
1101 {
1102         drv->drv.bus = &ecard_bus_type;
1103
1104         return driver_register(&drv->drv);
1105 }
1106
1107 void ecard_remove_driver(struct ecard_driver *drv)
1108 {
1109         driver_unregister(&drv->drv);
1110 }
1111
1112 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1113 {
1114         struct expansion_card *ec = ECARD_DEV(_dev);
1115         struct ecard_driver *drv = ECARD_DRV(_drv);
1116         int ret;
1117
1118         if (drv->id_table) {
1119                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1120         } else {
1121                 ret = ec->cid.id == drv->id;
1122         }
1123
1124         return ret;
1125 }
1126
1127 struct bus_type ecard_bus_type = {
1128         .name           = "ecard",
1129         .dev_groups     = ecard_dev_groups,
1130         .match          = ecard_match,
1131         .probe          = ecard_drv_probe,
1132         .remove         = ecard_drv_remove,
1133         .shutdown       = ecard_drv_shutdown,
1134 };
1135
1136 static int ecard_bus_init(void)
1137 {
1138         return bus_register(&ecard_bus_type);
1139 }
1140
1141 postcore_initcall(ecard_bus_init);
1142
1143 EXPORT_SYMBOL(ecard_readchunk);
1144 EXPORT_SYMBOL(ecard_register_driver);
1145 EXPORT_SYMBOL(ecard_remove_driver);
1146 EXPORT_SYMBOL(ecard_bus_type);