err.no Git - linux-2.6/blob - arch/arm/kernel/ecard.c

   1 /*
   2  *  linux/arch/arm/kernel/ecard.c
   3  *
   4  *  Copyright 1995-2001 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Find all installed expansion cards, and handle interrupts from them.
  11  *
  12  *  Created from information from Acorns RiscOS3 PRMs
  13  *
  14  *  08-Dec-1996 RMK     Added code for the 9'th expansion card - the ether
  15  *                      podule slot.
  16  *  06-May-1997 RMK     Added blacklist for cards whose loader doesn't work.
  17  *  12-Sep-1997 RMK     Created new handling of interrupt enables/disables
  18  *                      - cards can now register their own routine to control
  19  *                      interrupts (recommended).
  20  *  29-Sep-1997 RMK     Expansion card interrupt hardware not being re-enabled
  21  *                      on reset from Linux. (Caused cards not to respond
  22  *                      under RiscOS without hard reset).
  23  *  15-Feb-1998 RMK     Added DMA support
  24  *  12-Sep-1998 RMK     Added EASI support
  25  *  10-Jan-1999 RMK     Run loaders in a simulated RISC OS environment.
  26  *  17-Apr-1999 RMK     Support for EASI Type C cycles.
  27  */
  28 #define ECARD_C
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/types.h>
  33 #include <linux/sched.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/completion.h>
  36 #include <linux/reboot.h>
  37 #include <linux/mm.h>
  38 #include <linux/slab.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/device.h>
  41 #include <linux/init.h>
  42 #include <linux/mutex.h>
  43 #include <linux/kthread.h>
  44 #include <linux/io.h>
  45
  46 #include <asm/dma.h>
  47 #include <asm/ecard.h>
  48 #include <asm/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 #ifndef CONFIG_ARCH_RPC
  57 #define HAVE_EXPMASK
  58 #endif
  59
  60 struct ecard_request {
  61         void            (*fn)(struct ecard_request *);
  62         ecard_t         *ec;
  63         unsigned int    address;
  64         unsigned int    length;
  65         unsigned int    use_loader;
  66         void            *buffer;
  67         struct completion *complete;
  68 };
  69
  70 struct expcard_blacklist {
  71         unsigned short   manufacturer;
  72         unsigned short   product;
  73         const char      *type;
  74 };
  75
  76 static ecard_t *cards;
  77 static ecard_t *slot_to_expcard[MAX_ECARDS];
  78 static unsigned int ectcr;
  79 #ifdef HAS_EXPMASK
  80 static unsigned int have_expmask;
  81 #endif
  82
  83 /* List of descriptions of cards which don't have an extended
  84  * identification, or chunk directories containing a description.
  85  */
  86 static struct expcard_blacklist __initdata blacklist[] = {
  87         { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
  88 };
  89
  90 asmlinkage extern int
  91 ecard_loader_reset(unsigned long base, loader_t loader);
  92 asmlinkage extern int
  93 ecard_loader_read(int off, unsigned long base, loader_t loader);
  94
  95 static inline unsigned short ecard_getu16(unsigned char *v)
  96 {
  97         return v[0] | v[1] << 8;
  98 }
  99
 100 static inline signed long ecard_gets24(unsigned char *v)
 101 {
 102         return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
 103 }
 104
 105 static inline ecard_t *slot_to_ecard(unsigned int slot)
 106 {
 107         return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
 108 }
 109
 110 /* ===================== Expansion card daemon ======================== */
 111 /*
 112  * Since the loader programs on the expansion cards need to be run
 113  * in a specific environment, create a separate task with this
 114  * environment up, and pass requests to this task as and when we
 115  * need to.
 116  *
 117  * This should allow 99% of loaders to be called from Linux.
 118  *
 119  * From a security standpoint, we trust the card vendors.  This
 120  * may be a misplaced trust.
 121  */
 122 static void ecard_task_reset(struct ecard_request *req)
 123 {
 124         struct expansion_card *ec = req->ec;
 125         struct resource *res;
 126
 127         res = ec->slot_no == 8
 128                 ? &ec->resource[ECARD_RES_MEMC]
 129                 : ec->easi
 130                   ? &ec->resource[ECARD_RES_EASI]
 131                   : &ec->resource[ECARD_RES_IOCSYNC];
 132
 133         ecard_loader_reset(res->start, ec->loader);
 134 }
 135
 136 static void ecard_task_readbytes(struct ecard_request *req)
 137 {
 138         struct expansion_card *ec = req->ec;
 139         unsigned char *buf = req->buffer;
 140         unsigned int len = req->length;
 141         unsigned int off = req->address;
 142
 143         if (ec->slot_no == 8) {
 144                 void __iomem *base = (void __iomem *)
 145                                 ec->resource[ECARD_RES_MEMC].start;
 146
 147                 /*
 148                  * The card maintains an index which increments the address
 149                  * into a 4096-byte page on each access.  We need to keep
 150                  * track of the counter.
 151                  */
 152                 static unsigned int index;
 153                 unsigned int page;
 154
 155                 page = (off >> 12) * 4;
 156                 if (page > 256 * 4)
 157                         return;
 158
 159                 off &= 4095;
 160
 161                 /*
 162                  * If we are reading offset 0, or our current index is
 163                  * greater than the offset, reset the hardware index counter.
 164                  */
 165                 if (off == 0 || index > off) {
 166                         writeb(0, base);
 167                         index = 0;
 168                 }
 169
 170                 /*
 171                  * Increment the hardware index counter until we get to the
 172                  * required offset.  The read bytes are discarded.
 173                  */
 174                 while (index < off) {
 175                         readb(base + page);
 176                         index += 1;
 177                 }
 178
 179                 while (len--) {
 180                         *buf++ = readb(base + page);
 181                         index += 1;
 182                 }
 183         } else {
 184                 unsigned long base = (ec->easi
 185                          ? &ec->resource[ECARD_RES_EASI]
 186                          : &ec->resource[ECARD_RES_IOCSYNC])->start;
 187                 void __iomem *pbase = (void __iomem *)base;
 188
 189                 if (!req->use_loader || !ec->loader) {
 190                         off *= 4;
 191                         while (len--) {
 192                                 *buf++ = readb(pbase + off);
 193                                 off += 4;
 194                         }
 195                 } else {
 196                         while(len--) {
 197                                 /*
 198                                  * The following is required by some
 199                                  * expansion card loader programs.
 200                                  */
 201                                 *(unsigned long *)0x108 = 0;
 202                                 *buf++ = ecard_loader_read(off++, base,
 203                                                            ec->loader);
 204                         }
 205                 }
 206         }
 207
 208 }
 209
 210 static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
 211 static struct ecard_request *ecard_req;
 212 static DEFINE_MUTEX(ecard_mutex);
 213
 214 /*
 215  * Set up the expansion card daemon's page tables.
 216  */
 217 static void ecard_init_pgtables(struct mm_struct *mm)
 218 {
 219         struct vm_area_struct vma;
 220
 221         /* We want to set up the page tables for the following mapping:
 222          *  Virtual     Physical
 223          *  0x03000000  0x03000000
 224          *  0x03010000  unmapped
 225          *  0x03210000  0x03210000
 226          *  0x03400000  unmapped
 227          *  0x08000000  0x08000000
 228          *  0x10000000  unmapped
 229          *
 230          * FIXME: we don't follow this 100% yet.
 231          */
 232         pgd_t *src_pgd, *dst_pgd;
 233
 234         src_pgd = pgd_offset(mm, (unsigned long)IO_BASE);
 235         dst_pgd = pgd_offset(mm, IO_START);
 236
 237         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));
 238
 239         src_pgd = pgd_offset(mm, EASI_BASE);
 240         dst_pgd = pgd_offset(mm, EASI_START);
 241
 242         memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));
 243
 244         vma.vm_mm = mm;
 245
 246         flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
 247         flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
 248 }
 249
 250 static int ecard_init_mm(void)
 251 {
 252         struct mm_struct * mm = mm_alloc();
 253         struct mm_struct *active_mm = current->active_mm;
 254
 255         if (!mm)
 256                 return -ENOMEM;
 257
 258         current->mm = mm;
 259         current->active_mm = mm;
 260         activate_mm(active_mm, mm);
 261         mmdrop(active_mm);
 262         ecard_init_pgtables(mm);
 263         return 0;
 264 }
 265
 266 static int
 267 ecard_task(void * unused)
 268 {
 269         /*
 270          * Allocate a mm.  We're not a lazy-TLB kernel task since we need
 271          * to set page table entries where the user space would be.  Note
 272          * that this also creates the page tables.  Failure is not an
 273          * option here.
 274          */
 275         if (ecard_init_mm())
 276                 panic("kecardd: unable to alloc mm\n");
 277
 278         while (1) {
 279                 struct ecard_request *req;
 280
 281                 wait_event_interruptible(ecard_wait, ecard_req != NULL);
 282
 283                 req = xchg(&ecard_req, NULL);
 284                 if (req != NULL) {
 285                         req->fn(req);
 286                         complete(req->complete);
 287                 }
 288         }
 289 }
 290
 291 /*
 292  * Wake the expansion card daemon to action our request.
 293  *
 294  * FIXME: The test here is not sufficient to detect if the
 295  * kcardd is running.
 296  */
 297 static void ecard_call(struct ecard_request *req)
 298 {
 299         DECLARE_COMPLETION_ONSTACK(completion);
 300
 301         req->complete = &completion;
 302
 303         mutex_lock(&ecard_mutex);
 304         ecard_req = req;
 305         wake_up(&ecard_wait);
 306
 307         /*
 308          * Now wait for kecardd to run.
 309          */
 310         wait_for_completion(&completion);
 311         mutex_unlock(&ecard_mutex);
 312 }
 313
 314 /* ======================= Mid-level card control ===================== */
 315
 316 static void
 317 ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
 318 {
 319         struct ecard_request req;
 320
 321         req.fn          = ecard_task_readbytes;
 322         req.ec          = ec;
 323         req.address     = off;
 324         req.length      = len;
 325         req.use_loader  = useld;
 326         req.buffer      = addr;
 327
 328         ecard_call(&req);
 329 }
 330
 331 int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
 332 {
 333         struct ex_chunk_dir excd;
 334         int index = 16;
 335         int useld = 0;
 336
 337         if (!ec->cid.cd)
 338                 return 0;
 339
 340         while(1) {
 341                 ecard_readbytes(&excd, ec, index, 8, useld);
 342                 index += 8;
 343                 if (c_id(&excd) == 0) {
 344                         if (!useld && ec->loader) {
 345                                 useld = 1;
 346                                 index = 0;
 347                                 continue;
 348                         }
 349                         return 0;
 350                 }
 351                 if (c_id(&excd) == 0xf0) { /* link */
 352                         index = c_start(&excd);
 353                         continue;
 354                 }
 355                 if (c_id(&excd) == 0x80) { /* loader */
 356                         if (!ec->loader) {
 357                                 ec->loader = kmalloc(c_len(&excd),
 358                                                                GFP_KERNEL);
 359                                 if (ec->loader)
 360                                         ecard_readbytes(ec->loader, ec,
 361                                                         (int)c_start(&excd),
 362                                                         c_len(&excd), useld);
 363                                 else
 364                                         return 0;
 365                         }
 366                         continue;
 367                 }
 368                 if (c_id(&excd) == id && num-- == 0)
 369                         break;
 370         }
 371
 372         if (c_id(&excd) & 0x80) {
 373                 switch (c_id(&excd) & 0x70) {
 374                 case 0x70:
 375                         ecard_readbytes((unsigned char *)excd.d.string, ec,
 376                                         (int)c_start(&excd), c_len(&excd),
 377                                         useld);
 378                         break;
 379                 case 0x00:
 380                         break;
 381                 }
 382         }
 383         cd->start_offset = c_start(&excd);
 384         memcpy(cd->d.string, excd.d.string, 256);
 385         return 1;
 386 }
 387
 388 /* ======================= Interrupt control ============================ */
 389
 390 static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 391 {
 392 #ifdef HAS_EXPMASK
 393         if (irqnr < 4 && have_expmask) {
 394                 have_expmask |= 1 << irqnr;
 395                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 396         }
 397 #endif
 398 }
 399
 400 static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 401 {
 402 #ifdef HAS_EXPMASK
 403         if (irqnr < 4 && have_expmask) {
 404                 have_expmask &= ~(1 << irqnr);
 405                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 406         }
 407 #endif
 408 }
 409
 410 static int ecard_def_irq_pending(ecard_t *ec)
 411 {
 412         return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
 413 }
 414
 415 static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 416 {
 417         panic("ecard_def_fiq_enable called - impossible");
 418 }
 419
 420 static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 421 {
 422         panic("ecard_def_fiq_disable called - impossible");
 423 }
 424
 425 static int ecard_def_fiq_pending(ecard_t *ec)
 426 {
 427         return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
 428 }
 429
 430 static expansioncard_ops_t ecard_default_ops = {
 431         ecard_def_irq_enable,
 432         ecard_def_irq_disable,
 433         ecard_def_irq_pending,
 434         ecard_def_fiq_enable,
 435         ecard_def_fiq_disable,
 436         ecard_def_fiq_pending
 437 };
 438
 439 /*
 440  * Enable and disable interrupts from expansion cards.
 441  * (interrupts are disabled for these functions).
 442  *
 443  * They are not meant to be called directly, but via enable/disable_irq.
 444  */
 445 static void ecard_irq_unmask(unsigned int irqnr)
 446 {
 447         ecard_t *ec = slot_to_ecard(irqnr - 32);
 448
 449         if (ec) {
 450                 if (!ec->ops)
 451                         ec->ops = &ecard_default_ops;
 452
 453                 if (ec->claimed && ec->ops->irqenable)
 454                         ec->ops->irqenable(ec, irqnr);
 455                 else
 456                         printk(KERN_ERR "ecard: rejecting request to "
 457                                 "enable IRQs for %d\n", irqnr);
 458         }
 459 }
 460
 461 static void ecard_irq_mask(unsigned int irqnr)
 462 {
 463         ecard_t *ec = slot_to_ecard(irqnr - 32);
 464
 465         if (ec) {
 466                 if (!ec->ops)
 467                         ec->ops = &ecard_default_ops;
 468
 469                 if (ec->ops && ec->ops->irqdisable)
 470                         ec->ops->irqdisable(ec, irqnr);
 471         }
 472 }
 473
 474 static struct irq_chip ecard_chip = {
 475         .name   = "ECARD",
 476         .ack    = ecard_irq_mask,
 477         .mask   = ecard_irq_mask,
 478         .unmask = ecard_irq_unmask,
 479 };
 480
 481 void ecard_enablefiq(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->claimed && ec->ops->fiqenable)
 490                         ec->ops->fiqenable(ec, fiqnr);
 491                 else
 492                         printk(KERN_ERR "ecard: rejecting request to "
 493                                 "enable FIQs for %d\n", fiqnr);
 494         }
 495 }
 496
 497 void ecard_disablefiq(unsigned int fiqnr)
 498 {
 499         ecard_t *ec = slot_to_ecard(fiqnr);
 500
 501         if (ec) {
 502                 if (!ec->ops)
 503                         ec->ops = &ecard_default_ops;
 504
 505                 if (ec->ops->fiqdisable)
 506                         ec->ops->fiqdisable(ec, fiqnr);
 507         }
 508 }
 509
 510 static void ecard_dump_irq_state(void)
 511 {
 512         ecard_t *ec;
 513
 514         printk("Expansion card IRQ state:\n");
 515
 516         for (ec = cards; ec; ec = ec->next) {
 517                 if (ec->slot_no == 8)
 518                         continue;
 519
 520                 printk("  %d: %sclaimed, ",
 521                        ec->slot_no, ec->claimed ? "" : "not ");
 522
 523                 if (ec->ops && ec->ops->irqpending &&
 524                     ec->ops != &ecard_default_ops)
 525                         printk("irq %spending\n",
 526                                ec->ops->irqpending(ec) ? "" : "not ");
 527                 else
 528                         printk("irqaddr %p, mask = %02X, status = %02X\n",
 529                                ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
 530         }
 531 }
 532
 533 static void ecard_check_lockup(struct irq_desc *desc)
 534 {
 535         static unsigned long last;
 536         static int lockup;
 537
 538         /*
 539          * If the timer interrupt has not run since the last million
 540          * unrecognised expansion card interrupts, then there is
 541          * something seriously wrong.  Disable the expansion card
 542          * interrupts so at least we can continue.
 543          *
 544          * Maybe we ought to start a timer to re-enable them some time
 545          * later?
 546          */
 547         if (last == jiffies) {
 548                 lockup += 1;
 549                 if (lockup > 1000000) {
 550                         printk(KERN_ERR "\nInterrupt lockup detected - "
 551                                "disabling all expansion card interrupts\n");
 552
 553                         desc->chip->mask(IRQ_EXPANSIONCARD);
 554                         ecard_dump_irq_state();
 555                 }
 556         } else
 557                 lockup = 0;
 558
 559         /*
 560          * If we did not recognise the source of this interrupt,
 561          * warn the user, but don't flood the user with these messages.
 562          */
 563         if (!last || time_after(jiffies, last + 5*HZ)) {
 564                 last = jiffies;
 565                 printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
 566                 ecard_dump_irq_state();
 567         }
 568 }
 569
 570 static void
 571 ecard_irq_handler(unsigned int irq, struct irq_desc *desc)
 572 {
 573         ecard_t *ec;
 574         int called = 0;
 575
 576         desc->chip->mask(irq);
 577         for (ec = cards; ec; ec = ec->next) {
 578                 int pending;
 579
 580                 if (!ec->claimed || ec->irq == NO_IRQ || ec->slot_no == 8)
 581                         continue;
 582
 583                 if (ec->ops && ec->ops->irqpending)
 584                         pending = ec->ops->irqpending(ec);
 585                 else
 586                         pending = ecard_default_ops.irqpending(ec);
 587
 588                 if (pending) {
 589                         struct irq_desc *d = irq_desc + ec->irq;
 590                         desc_handle_irq(ec->irq, d);
 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                         struct irq_desc *d = irq_desc + ec->irq;
 625                         /*
 626                          * this ugly code is so that we can operate a
 627                          * prioritorising system:
 628                          *
 629                          * Card 0       highest priority
 630                          * Card 1
 631                          * Card 2
 632                          * Card 3       lowest priority
 633                          *
 634                          * Serial cards should go in 0/1, ethernet/scsi in 2/3
 635                          * otherwise you will lose serial data at high speeds!
 636                          */
 637                         desc_handle_irq(ec->irq, d);
 638                 } else {
 639                         printk(KERN_WARNING "card%d: interrupt from unclaimed "
 640                                "card???\n", slot);
 641                         have_expmask &= ~(1 << slot);
 642                         __raw_writeb(have_expmask, EXPMASK_ENABLE);
 643                 }
 644         } else
 645                 printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
 646 }
 647
 648 static int __init ecard_probeirqhw(void)
 649 {
 650         ecard_t *ec;
 651         int found;
 652
 653         __raw_writeb(0x00, EXPMASK_ENABLE);
 654         __raw_writeb(0xff, EXPMASK_STATUS);
 655         found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
 656         __raw_writeb(0xff, EXPMASK_ENABLE);
 657
 658         if (found) {
 659                 printk(KERN_DEBUG "Expansion card interrupt "
 660                        "management hardware found\n");
 661
 662                 /* for each card present, set a bit to '1' */
 663                 have_expmask = 0x80000000;
 664
 665                 for (ec = cards; ec; ec = ec->next)
 666                         have_expmask |= 1 << ec->slot_no;
 667
 668                 __raw_writeb(have_expmask, EXPMASK_ENABLE);
 669         }
 670
 671         return found;
 672 }
 673 #else
 674 #define ecard_irqexp_handler NULL
 675 #define ecard_probeirqhw() (0)
 676 #endif
 677
 678 #ifndef IO_EC_MEMC8_BASE
 679 #define IO_EC_MEMC8_BASE 0
 680 #endif
 681
 682 unsigned int __ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
 683 {
 684         unsigned long address = 0;
 685         int slot = ec->slot_no;
 686
 687         if (ec->slot_no == 8)
 688                 return IO_EC_MEMC8_BASE;
 689
 690         ectcr &= ~(1 << slot);
 691
 692         switch (type) {
 693         case ECARD_MEMC:
 694                 if (slot < 4)
 695                         address = IO_EC_MEMC_BASE + (slot << 12);
 696                 break;
 697
 698         case ECARD_IOC:
 699                 if (slot < 4)
 700                         address = IO_EC_IOC_BASE + (slot << 12);
 701 #ifdef IO_EC_IOC4_BASE
 702                 else
 703                         address = IO_EC_IOC4_BASE + ((slot - 4) << 12);
 704 #endif
 705                 if (address)
 706                         address +=  speed << 17;
 707                 break;
 708
 709 #ifdef IO_EC_EASI_BASE
 710         case ECARD_EASI:
 711                 address = IO_EC_EASI_BASE + (slot << 22);
 712                 if (speed == ECARD_FAST)
 713                         ectcr |= 1 << slot;
 714                 break;
 715 #endif
 716         default:
 717                 break;
 718         }
 719
 720 #ifdef IOMD_ECTCR
 721         iomd_writeb(ectcr, IOMD_ECTCR);
 722 #endif
 723         return address;
 724 }
 725
 726 static int ecard_prints(char *buffer, ecard_t *ec)
 727 {
 728         char *start = buffer;
 729
 730         buffer += sprintf(buffer, "  %d: %s ", ec->slot_no,
 731                           ec->easi ? "EASI" : "    ");
 732
 733         if (ec->cid.id == 0) {
 734                 struct in_chunk_dir incd;
 735
 736                 buffer += sprintf(buffer, "[%04X:%04X] ",
 737                         ec->cid.manufacturer, ec->cid.product);
 738
 739                 if (!ec->card_desc && ec->cid.cd &&
 740                     ecard_readchunk(&incd, ec, 0xf5, 0)) {
 741                         ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);
 742
 743                         if (ec->card_desc)
 744                                 strcpy((char *)ec->card_desc, incd.d.string);
 745                 }
 746
 747                 buffer += sprintf(buffer, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
 748         } else
 749                 buffer += sprintf(buffer, "Simple card %d\n", ec->cid.id);
 750
 751         return buffer - start;
 752 }
 753
 754 static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
 755 {
 756         ecard_t *ec = cards;
 757         off_t at = 0;
 758         int len, cnt;
 759
 760         cnt = 0;
 761         while (ec && count > cnt) {
 762                 len = ecard_prints(buf, ec);
 763                 at += len;
 764                 if (at >= pos) {
 765                         if (!*start) {
 766                                 *start = buf + (pos - (at - len));
 767                                 cnt = at - pos;
 768                         } else
 769                                 cnt += len;
 770                         buf += len;
 771                 }
 772                 ec = ec->next;
 773         }
 774         return (count > cnt) ? cnt : count;
 775 }
 776
 777 static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 778
 779 static void ecard_proc_init(void)
 780 {
 781         proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
 782         create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
 783                 get_ecard_dev_info);
 784 }
 785
 786 #define ec_set_resource(ec,nr,st,sz)                            \
 787         do {                                                    \
 788                 (ec)->resource[nr].name = ec->dev.bus_id;       \
 789                 (ec)->resource[nr].start = st;                  \
 790                 (ec)->resource[nr].end = (st) + (sz) - 1;       \
 791                 (ec)->resource[nr].flags = IORESOURCE_MEM;      \
 792         } while (0)
 793
 794 static void __init ecard_free_card(struct expansion_card *ec)
 795 {
 796         int i;
 797
 798         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 799                 if (ec->resource[i].flags)
 800                         release_resource(&ec->resource[i]);
 801
 802         kfree(ec);
 803 }
 804
 805 static struct expansion_card *__init ecard_alloc_card(int type, int slot)
 806 {
 807         struct expansion_card *ec;
 808         unsigned long base;
 809         int i;
 810
 811         ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
 812         if (!ec) {
 813                 ec = ERR_PTR(-ENOMEM);
 814                 goto nomem;
 815         }
 816
 817         ec->slot_no = slot;
 818         ec->easi = type == ECARD_EASI;
 819         ec->irq = NO_IRQ;
 820         ec->fiq = NO_IRQ;
 821         ec->dma = NO_DMA;
 822         ec->ops = &ecard_default_ops;
 823
 824         snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "ecard%d", slot);
 825         ec->dev.parent = NULL;
 826         ec->dev.bus = &ecard_bus_type;
 827         ec->dev.dma_mask = &ec->dma_mask;
 828         ec->dma_mask = (u64)0xffffffff;
 829         ec->dev.coherent_dma_mask = ec->dma_mask;
 830
 831         if (slot < 4) {
 832                 ec_set_resource(ec, ECARD_RES_MEMC,
 833                                 PODSLOT_MEMC_BASE + (slot << 14),
 834                                 PODSLOT_MEMC_SIZE);
 835                 base = PODSLOT_IOC0_BASE + (slot << 14);
 836         } else
 837                 base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);
 838
 839 #ifdef CONFIG_ARCH_RPC
 840         if (slot < 8) {
 841                 ec_set_resource(ec, ECARD_RES_EASI,
 842                                 PODSLOT_EASI_BASE + (slot << 24),
 843                                 PODSLOT_EASI_SIZE);
 844         }
 845
 846         if (slot == 8) {
 847                 ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
 848         } else
 849 #endif
 850
 851         for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
 852                 ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
 853                                 base + (i << 19), PODSLOT_IOC_SIZE);
 854
 855         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 856                 if (ec->resource[i].flags &&
 857                     request_resource(&iomem_resource, &ec->resource[i])) {
 858                         printk(KERN_ERR "%s: resource(s) not available\n",
 859                                 ec->dev.bus_id);
 860                         ec->resource[i].end -= ec->resource[i].start;
 861                         ec->resource[i].start = 0;
 862                         ec->resource[i].flags = 0;
 863                 }
 864         }
 865
 866  nomem:
 867         return ec;
 868 }
 869
 870 static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf)
 871 {
 872         struct expansion_card *ec = ECARD_DEV(dev);
 873         return sprintf(buf, "%u\n", ec->irq);
 874 }
 875
 876 static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
 877 {
 878         struct expansion_card *ec = ECARD_DEV(dev);
 879         return sprintf(buf, "%u\n", ec->dma);
 880 }
 881
 882 static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
 883 {
 884         struct expansion_card *ec = ECARD_DEV(dev);
 885         char *str = buf;
 886         int i;
 887
 888         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 889                 str += sprintf(str, "%08x %08x %08lx\n",
 890                                 ec->resource[i].start,
 891                                 ec->resource[i].end,
 892                                 ec->resource[i].flags);
 893
 894         return str - buf;
 895 }
 896
 897 static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf)
 898 {
 899         struct expansion_card *ec = ECARD_DEV(dev);
 900         return sprintf(buf, "%u\n", ec->cid.manufacturer);
 901 }
 902
 903 static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
 904 {
 905         struct expansion_card *ec = ECARD_DEV(dev);
 906         return sprintf(buf, "%u\n", ec->cid.product);
 907 }
 908
 909 static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
 910 {
 911         struct expansion_card *ec = ECARD_DEV(dev);
 912         return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
 913 }
 914
 915 static struct device_attribute ecard_dev_attrs[] = {
 916         __ATTR(device,   S_IRUGO, ecard_show_device,    NULL),
 917         __ATTR(dma,      S_IRUGO, ecard_show_dma,       NULL),
 918         __ATTR(irq,      S_IRUGO, ecard_show_irq,       NULL),
 919         __ATTR(resource, S_IRUGO, ecard_show_resources, NULL),
 920         __ATTR(type,     S_IRUGO, ecard_show_type,      NULL),
 921         __ATTR(vendor,   S_IRUGO, ecard_show_vendor,    NULL),
 922         __ATTR_NULL,
 923 };
 924
 925
 926 int ecard_request_resources(struct expansion_card *ec)
 927 {
 928         int i, err = 0;
 929
 930         for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
 931                 if (ecard_resource_end(ec, i) &&
 932                     !request_mem_region(ecard_resource_start(ec, i),
 933                                         ecard_resource_len(ec, i),
 934                                         ec->dev.driver->name)) {
 935                         err = -EBUSY;
 936                         break;
 937                 }
 938         }
 939
 940         if (err) {
 941                 while (i--)
 942                         if (ecard_resource_end(ec, i))
 943                                 release_mem_region(ecard_resource_start(ec, i),
 944                                                    ecard_resource_len(ec, i));
 945         }
 946         return err;
 947 }
 948 EXPORT_SYMBOL(ecard_request_resources);
 949
 950 void ecard_release_resources(struct expansion_card *ec)
 951 {
 952         int i;
 953
 954         for (i = 0; i < ECARD_NUM_RESOURCES; i++)
 955                 if (ecard_resource_end(ec, i))
 956                         release_mem_region(ecard_resource_start(ec, i),
 957                                            ecard_resource_len(ec, i));
 958 }
 959 EXPORT_SYMBOL(ecard_release_resources);
 960
 961 void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
 962 {
 963         ec->irq_data = irq_data;
 964         barrier();
 965         ec->ops = ops;
 966 }
 967 EXPORT_SYMBOL(ecard_setirq);
 968
 969 void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
 970                            unsigned long offset, unsigned long maxsize)
 971 {
 972         unsigned long start = ecard_resource_start(ec, res);
 973         unsigned long end = ecard_resource_end(ec, res);
 974
 975         if (offset > (end - start))
 976                 return NULL;
 977
 978         start += offset;
 979         if (maxsize && end - start > maxsize)
 980                 end = start + maxsize;
 981
 982         return devm_ioremap(&ec->dev, start, end - start);
 983 }
 984 EXPORT_SYMBOL(ecardm_iomap);
 985
 986 /*
 987  * Probe for an expansion card.
 988  *
 989  * If bit 1 of the first byte of the card is set, then the
 990  * card does not exist.
 991  */
 992 static int __init
 993 ecard_probe(int slot, card_type_t type)
 994 {
 995         ecard_t **ecp;
 996         ecard_t *ec;
 997         struct ex_ecid cid;
 998         int i, rc;
 999
1000         ec = ecard_alloc_card(type, slot);
1001         if (IS_ERR(ec)) {
1002                 rc = PTR_ERR(ec);
1003                 goto nomem;
1004         }
1005
1006         rc = -ENODEV;
1007         if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
1008                 goto nodev;
1009
1010         cid.r_zero = 1;
1011         ecard_readbytes(&cid, ec, 0, 16, 0);
1012         if (cid.r_zero)
1013                 goto nodev;
1014
1015         ec->cid.id      = cid.r_id;
1016         ec->cid.cd      = cid.r_cd;
1017         ec->cid.is      = cid.r_is;
1018         ec->cid.w       = cid.r_w;
1019         ec->cid.manufacturer = ecard_getu16(cid.r_manu);
1020         ec->cid.product = ecard_getu16(cid.r_prod);
1021         ec->cid.country = cid.r_country;
1022         ec->cid.irqmask = cid.r_irqmask;
1023         ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
1024         ec->cid.fiqmask = cid.r_fiqmask;
1025         ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
1026         ec->fiqaddr     =
1027         ec->irqaddr     = (void __iomem *)ioaddr(ec->podaddr);
1028
1029         if (ec->cid.is) {
1030                 ec->irqmask = ec->cid.irqmask;
1031                 ec->irqaddr += ec->cid.irqoff;
1032                 ec->fiqmask = ec->cid.fiqmask;
1033                 ec->fiqaddr += ec->cid.fiqoff;
1034         } else {
1035                 ec->irqmask = 1;
1036                 ec->fiqmask = 4;
1037         }
1038
1039         for (i = 0; i < ARRAY_SIZE(blacklist); i++)
1040                 if (blacklist[i].manufacturer == ec->cid.manufacturer &&
1041                     blacklist[i].product == ec->cid.product) {
1042                         ec->card_desc = blacklist[i].type;
1043                         break;
1044                 }
1045
1046         /*
1047          * hook the interrupt handlers
1048          */
1049         if (slot < 8) {
1050                 ec->irq = 32 + slot;
1051                 set_irq_chip(ec->irq, &ecard_chip);
1052                 set_irq_handler(ec->irq, handle_level_irq);
1053                 set_irq_flags(ec->irq, IRQF_VALID);
1054         }
1055
1056 #ifdef IO_EC_MEMC8_BASE
1057         if (slot == 8)
1058                 ec->irq = 11;
1059 #endif
1060 #ifdef CONFIG_ARCH_RPC
1061         /* On RiscPC, only first two slots have DMA capability */
1062         if (slot < 2)
1063                 ec->dma = 2 + slot;
1064 #endif
1065
1066         for (ecp = &cards; *ecp; ecp = &(*ecp)->next);
1067
1068         *ecp = ec;
1069         slot_to_expcard[slot] = ec;
1070
1071         device_register(&ec->dev);
1072
1073         return 0;
1074
1075  nodev:
1076         ecard_free_card(ec);
1077  nomem:
1078         return rc;
1079 }
1080
1081 /*
1082  * Initialise the expansion card system.
1083  * Locate all hardware - interrupt management and
1084  * actual cards.
1085  */
1086 static int __init ecard_init(void)
1087 {
1088         struct task_struct *task;
1089         int slot, irqhw;
1090
1091         task = kthread_run(ecard_task, NULL, "kecardd");
1092         if (IS_ERR(task)) {
1093                 printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
1094                        PTR_ERR(task));
1095                 return PTR_ERR(task);
1096         }
1097
1098         printk("Probing expansion cards\n");
1099
1100         for (slot = 0; slot < 8; slot ++) {
1101                 if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
1102                         ecard_probe(slot, ECARD_IOC);
1103         }
1104
1105 #ifdef IO_EC_MEMC8_BASE
1106         ecard_probe(8, ECARD_IOC);
1107 #endif
1108
1109         irqhw = ecard_probeirqhw();
1110
1111         set_irq_chained_handler(IRQ_EXPANSIONCARD,
1112                                 irqhw ? ecard_irqexp_handler : ecard_irq_handler);
1113
1114         ecard_proc_init();
1115
1116         return 0;
1117 }
1118
1119 subsys_initcall(ecard_init);
1120
1121 /*
1122  *      ECARD "bus"
1123  */
1124 static const struct ecard_id *
1125 ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
1126 {
1127         int i;
1128
1129         for (i = 0; ids[i].manufacturer != 65535; i++)
1130                 if (ec->cid.manufacturer == ids[i].manufacturer &&
1131                     ec->cid.product == ids[i].product)
1132                         return ids + i;
1133
1134         return NULL;
1135 }
1136
1137 static int ecard_drv_probe(struct device *dev)
1138 {
1139         struct expansion_card *ec = ECARD_DEV(dev);
1140         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1141         const struct ecard_id *id;
1142         int ret;
1143
1144         id = ecard_match_device(drv->id_table, ec);
1145
1146         ecard_claim(ec);
1147         ret = drv->probe(ec, id);
1148         if (ret)
1149                 ecard_release(ec);
1150         return ret;
1151 }
1152
1153 static int ecard_drv_remove(struct device *dev)
1154 {
1155         struct expansion_card *ec = ECARD_DEV(dev);
1156         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1157
1158         drv->remove(ec);
1159         ecard_release(ec);
1160
1161         /*
1162          * Restore the default operations.  We ensure that the
1163          * ops are set before we change the data.
1164          */
1165         ec->ops = &ecard_default_ops;
1166         barrier();
1167         ec->irq_data = NULL;
1168
1169         return 0;
1170 }
1171
1172 /*
1173  * Before rebooting, we must make sure that the expansion card is in a
1174  * sensible state, so it can be re-detected.  This means that the first
1175  * page of the ROM must be visible.  We call the expansion cards reset
1176  * handler, if any.
1177  */
1178 static void ecard_drv_shutdown(struct device *dev)
1179 {
1180         struct expansion_card *ec = ECARD_DEV(dev);
1181         struct ecard_driver *drv = ECARD_DRV(dev->driver);
1182         struct ecard_request req;
1183
1184         if (dev->driver) {
1185                 if (drv->shutdown)
1186                         drv->shutdown(ec);
1187                 ecard_release(ec);
1188         }
1189
1190         /*
1191          * If this card has a loader, call the reset handler.
1192          */
1193         if (ec->loader) {
1194                 req.fn = ecard_task_reset;
1195                 req.ec = ec;
1196                 ecard_call(&req);
1197         }
1198 }
1199
1200 int ecard_register_driver(struct ecard_driver *drv)
1201 {
1202         drv->drv.bus = &ecard_bus_type;
1203
1204         return driver_register(&drv->drv);
1205 }
1206
1207 void ecard_remove_driver(struct ecard_driver *drv)
1208 {
1209         driver_unregister(&drv->drv);
1210 }
1211
1212 static int ecard_match(struct device *_dev, struct device_driver *_drv)
1213 {
1214         struct expansion_card *ec = ECARD_DEV(_dev);
1215         struct ecard_driver *drv = ECARD_DRV(_drv);
1216         int ret;
1217
1218         if (drv->id_table) {
1219                 ret = ecard_match_device(drv->id_table, ec) != NULL;
1220         } else {
1221                 ret = ec->cid.id == drv->id;
1222         }
1223
1224         return ret;
1225 }
1226
1227 struct bus_type ecard_bus_type = {
1228         .name           = "ecard",
1229         .dev_attrs      = ecard_dev_attrs,
1230         .match          = ecard_match,
1231         .probe          = ecard_drv_probe,
1232         .remove         = ecard_drv_remove,
1233         .shutdown       = ecard_drv_shutdown,
1234 };
1235
1236 static int ecard_bus_init(void)
1237 {
1238         return bus_register(&ecard_bus_type);
1239 }
1240
1241 postcore_initcall(ecard_bus_init);
1242
1243 EXPORT_SYMBOL(ecard_readchunk);
1244 EXPORT_SYMBOL(__ecard_address);
1245 EXPORT_SYMBOL(ecard_register_driver);
1246 EXPORT_SYMBOL(ecard_remove_driver);
1247 EXPORT_SYMBOL(ecard_bus_type);