linux/arch/arm/mach-rpc/ecard.c
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   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
  56struct 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
  66struct expcard_quirklist {
  67        unsigned short   manufacturer;
  68        unsigned short   product;
  69        const char      *type;
  70        void (*init)(ecard_t *ec);
  71};
  72
  73static ecard_t *cards;
  74static ecard_t *slot_to_expcard[MAX_ECARDS];
  75static unsigned int ectcr;
  76
  77static 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 */
  82static 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
  87asmlinkage extern int
  88ecard_loader_reset(unsigned long base, loader_t loader);
  89asmlinkage extern int
  90ecard_loader_read(int off, unsigned long base, loader_t loader);
  91
  92static inline unsigned short ecard_getu16(unsigned char *v)
  93{
  94        return v[0] | v[1] << 8;
  95}
  96
  97static 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
 102static 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 */
 119static 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
 133static 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
 207static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
 208static struct ecard_request *ecard_req;
 209static DEFINE_MUTEX(ecard_mutex);
 210
 211/*
 212 * Set up the expansion card daemon's page tables.
 213 */
 214static 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
 245static 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
 261static int
 262ecard_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 */
 292static 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
 311static void
 312ecard_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
 326int 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
 385static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
 386{
 387}
 388
 389static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
 390{
 391}
 392
 393static int ecard_def_irq_pending(ecard_t *ec)
 394{
 395        return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
 396}
 397
 398static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
 399{
 400        panic("ecard_def_fiq_enable called - impossible");
 401}
 402
 403static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
 404{
 405        panic("ecard_def_fiq_disable called - impossible");
 406}
 407
 408static int ecard_def_fiq_pending(ecard_t *ec)
 409{
 410        return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
 411}
 412
 413static 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 */
 428static 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
 444static 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
 457static 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
 464void 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
 480void 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
 493static 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
 519static 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
 556static 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
 584static 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
 625static 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
 650static 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
 661static struct proc_dir_entry *proc_bus_ecard_dir = NULL;
 662
 663static 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
 678static 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
 689static 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
 753static 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}
 758static DEVICE_ATTR_RO(irq);
 759
 760static 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}
 765static DEVICE_ATTR_RO(dma);
 766
 767static 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}
 781static DEVICE_ATTR_RO(resource);
 782
 783static 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}
 788static DEVICE_ATTR_RO(vendor);
 789
 790static 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}
 795static DEVICE_ATTR_RO(device);
 796
 797static 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}
 802static DEVICE_ATTR_RO(type);
 803
 804static 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};
 813ATTRIBUTE_GROUPS(ecard_dev);
 814
 815int 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}
 837EXPORT_SYMBOL(ecard_request_resources);
 838
 839void 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}
 848EXPORT_SYMBOL(ecard_release_resources);
 849
 850void 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}
 856EXPORT_SYMBOL(ecard_setirq);
 857
 858void __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}
 873EXPORT_SYMBOL(ecardm_iomap);
 874
 875static 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 */
 891static 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 */
 988static 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
1021subsys_initcall(ecard_init);
1022
1023/*
1024 *      ECARD "bus"
1025 */
1026static const struct ecard_id *
1027ecard_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
1039static 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
1055static int 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        return 0;
1072}
1073
1074/*
1075 * Before rebooting, we must make sure that the expansion card is in a
1076 * sensible state, so it can be re-detected.  This means that the first
1077 * page of the ROM must be visible.  We call the expansion cards reset
1078 * handler, if any.
1079 */
1080static void ecard_drv_shutdown(struct device *dev)
1081{
1082        struct expansion_card *ec = ECARD_DEV(dev);
1083        struct ecard_driver *drv = ECARD_DRV(dev->driver);
1084        struct ecard_request req;
1085
1086        if (dev->driver) {
1087                if (drv->shutdown)
1088                        drv->shutdown(ec);
1089                ec->claimed = 0;
1090        }
1091
1092        /*
1093         * If this card has a loader, call the reset handler.
1094         */
1095        if (ec->loader) {
1096                req.fn = ecard_task_reset;
1097                req.ec = ec;
1098                ecard_call(&req);
1099        }
1100}
1101
1102int ecard_register_driver(struct ecard_driver *drv)
1103{
1104        drv->drv.bus = &ecard_bus_type;
1105
1106        return driver_register(&drv->drv);
1107}
1108
1109void ecard_remove_driver(struct ecard_driver *drv)
1110{
1111        driver_unregister(&drv->drv);
1112}
1113
1114static int ecard_match(struct device *_dev, struct device_driver *_drv)
1115{
1116        struct expansion_card *ec = ECARD_DEV(_dev);
1117        struct ecard_driver *drv = ECARD_DRV(_drv);
1118        int ret;
1119
1120        if (drv->id_table) {
1121                ret = ecard_match_device(drv->id_table, ec) != NULL;
1122        } else {
1123                ret = ec->cid.id == drv->id;
1124        }
1125
1126        return ret;
1127}
1128
1129struct bus_type ecard_bus_type = {
1130        .name           = "ecard",
1131        .dev_groups     = ecard_dev_groups,
1132        .match          = ecard_match,
1133        .probe          = ecard_drv_probe,
1134        .remove         = ecard_drv_remove,
1135        .shutdown       = ecard_drv_shutdown,
1136};
1137
1138static int ecard_bus_init(void)
1139{
1140        return bus_register(&ecard_bus_type);
1141}
1142
1143postcore_initcall(ecard_bus_init);
1144
1145EXPORT_SYMBOL(ecard_readchunk);
1146EXPORT_SYMBOL(ecard_register_driver);
1147EXPORT_SYMBOL(ecard_remove_driver);
1148EXPORT_SYMBOL(ecard_bus_type);
1149