ecard.c

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/*
 *  linux/arch/arm/kernel/ecard.c
 *
 *  Copyright 1995-2001 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Find all installed expansion cards, and handle interrupts from them.
 *
 *  Created from information from Acorns RiscOS3 PRMs
 *
 *  08-Dec-1996 RMK Added code for the 9'th expansion card - the ether
 *          podule slot.
 *  06-May-1997 RMK Added blacklist for cards whose loader doesn't work.
 *  12-Sep-1997 RMK Created new handling of interrupt enables/disables
 *          - cards can now register their own routine to control
 *          interrupts (recommended).
 *  29-Sep-1997 RMK Expansion card interrupt hardware not being re-enabled
 *          on reset from Linux. (Caused cards not to respond
 *          under RiscOS without hard reset).
 *  15-Feb-1998 RMK Added DMA support
 *  12-Sep-1998 RMK Added EASI support
 *  10-Jan-1999 RMK Run loaders in a simulated RISC OS environment.
 *  17-Apr-1999 RMK Support for EASI Type C cycles.
 */
#define ECARD_C

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/reboot.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/kthread.h>
#include <linux/irq.h>
#include <linux/io.h>

#include <asm/dma.h>
#include <asm/ecard.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/mach/irq.h>
#include <asm/tlbflush.h>

#include "ecard.h"

struct ecard_request {
    void        (*fn)(struct ecard_request *);
    ecard_t     *ec;
    unsigned int    address;
    unsigned int    length;
    unsigned int    use_loader;
    void        *buffer;
    struct completion *complete;
};

struct expcard_blacklist {
    unsigned short   manufacturer;
    unsigned short   product;
    const char  *type;
};

static ecard_t *cards;
static ecard_t *slot_to_expcard[MAX_ECARDS];
static unsigned int ectcr;

/* List of descriptions of cards which don't have an extended
 * identification, or chunk directories containing a description.
 */
static struct expcard_blacklist __initdata blacklist[] = {
    { MANU_ACORN, PROD_ACORN_ETHER1, "Acorn Ether1" }
};

asmlinkage extern int
ecard_loader_reset(unsigned long base, loader_t loader);
asmlinkage extern int
ecard_loader_read(int off, unsigned long base, loader_t loader);

static inline unsigned short ecard_getu16(unsigned char *v)
{
    return v[0] | v[1] << 8;
}

static inline signed long ecard_gets24(unsigned char *v)
{
    return v[0] | v[1] << 8 | v[2] << 16 | ((v[2] & 0x80) ? 0xff000000 : 0);
}

static inline ecard_t *slot_to_ecard(unsigned int slot)
{
    return slot < MAX_ECARDS ? slot_to_expcard[slot] : NULL;
}

/* ===================== Expansion card daemon ======================== */
/*
 * Since the loader programs on the expansion cards need to be run
 * in a specific environment, create a separate task with this
 * environment up, and pass requests to this task as and when we
 * need to.
 *
 * This should allow 99% of loaders to be called from Linux.
 *
 * From a security standpoint, we trust the card vendors.  This
 * may be a misplaced trust.
 */
static void ecard_task_reset(struct ecard_request *req)
{
    struct expansion_card *ec = req->ec;
    struct resource *res;

    res = ec->slot_no == 8
        ? &ec->resource[ECARD_RES_MEMC]
        : ec->easi
          ? &ec->resource[ECARD_RES_EASI]
          : &ec->resource[ECARD_RES_IOCSYNC];

    ecard_loader_reset(res->start, ec->loader);
}

static void ecard_task_readbytes(struct ecard_request *req)
{
    struct expansion_card *ec = req->ec;
    unsigned char *buf = req->buffer;
    unsigned int len = req->length;
    unsigned int off = req->address;

    if (ec->slot_no == 8) {
        void __iomem *base = (void __iomem *)
                ec->resource[ECARD_RES_MEMC].start;

        /*
         * The card maintains an index which increments the address
         * into a 4096-byte page on each access.  We need to keep
         * track of the counter.
         */
        static unsigned int index;
        unsigned int page;

        page = (off >> 12) * 4;
        if (page > 256 * 4)
            return;

        off &= 4095;

        /*
         * If we are reading offset 0, or our current index is
         * greater than the offset, reset the hardware index counter.
         */
        if (off == 0 || index > off) {
            writeb(0, base);
            index = 0;
        }

        /*
         * Increment the hardware index counter until we get to the
         * required offset.  The read bytes are discarded.
         */
        while (index < off) {
            readb(base + page);
            index += 1;
        }

        while (len--) {
            *buf++ = readb(base + page);
            index += 1;
        }
    } else {
        unsigned long base = (ec->easi
             ? &ec->resource[ECARD_RES_EASI]
             : &ec->resource[ECARD_RES_IOCSYNC])->start;
        void __iomem *pbase = (void __iomem *)base;

        if (!req->use_loader || !ec->loader) {
            off *= 4;
            while (len--) {
                *buf++ = readb(pbase + off);
                off += 4;
            }
        } else {
            while(len--) {
                /*
                 * The following is required by some
                 * expansion card loader programs.
                 */
                *(unsigned long *)0x108 = 0;
                *buf++ = ecard_loader_read(off++, base,
                               ec->loader);
            }
        }
    }

}

static DECLARE_WAIT_QUEUE_HEAD(ecard_wait);
static struct ecard_request *ecard_req;
static DEFINE_MUTEX(ecard_mutex);

/*
 * Set up the expansion card daemon's page tables.
 */
static void ecard_init_pgtables(struct mm_struct *mm)
{
    struct vm_area_struct vma;

    /* We want to set up the page tables for the following mapping:
     *  Virtual Physical
     *  0x03000000  0x03000000
     *  0x03010000  unmapped
     *  0x03210000  0x03210000
     *  0x03400000  unmapped
     *  0x08000000  0x08000000
     *  0x10000000  unmapped
     *
     * FIXME: we don't follow this 100% yet.
     */
    pgd_t *src_pgd, *dst_pgd;

    src_pgd = pgd_offset(mm, (unsigned long)IO_BASE);
    dst_pgd = pgd_offset(mm, IO_START);

    memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (IO_SIZE / PGDIR_SIZE));

    src_pgd = pgd_offset(mm, (unsigned long)EASI_BASE);
    dst_pgd = pgd_offset(mm, EASI_START);

    memcpy(dst_pgd, src_pgd, sizeof(pgd_t) * (EASI_SIZE / PGDIR_SIZE));

    vma.vm_flags = VM_EXEC;
    vma.vm_mm = mm;

    flush_tlb_range(&vma, IO_START, IO_START + IO_SIZE);
    flush_tlb_range(&vma, EASI_START, EASI_START + EASI_SIZE);
}

static int ecard_init_mm(void)
{
    struct mm_struct * mm = mm_alloc();
    struct mm_struct *active_mm = current->active_mm;

    if (!mm)
        return -ENOMEM;

    current->mm = mm;
    current->active_mm = mm;
    activate_mm(active_mm, mm);
    mmdrop(active_mm);
    ecard_init_pgtables(mm);
    return 0;
}

static int
ecard_task(void * unused)
{
    /*
     * Allocate a mm.  We're not a lazy-TLB kernel task since we need
     * to set page table entries where the user space would be.  Note
     * that this also creates the page tables.  Failure is not an
     * option here.
     */
    if (ecard_init_mm())
        panic("kecardd: unable to alloc mm\n");

    while (1) {
        struct ecard_request *req;

        wait_event_interruptible(ecard_wait, ecard_req != NULL);

        req = xchg(&ecard_req, NULL);
        if (req != NULL) {
            req->fn(req);
            complete(req->complete);
        }
    }
}

/*
 * Wake the expansion card daemon to action our request.
 *
 * FIXME: The test here is not sufficient to detect if the
 * kcardd is running.
 */
static void ecard_call(struct ecard_request *req)
{
    DECLARE_COMPLETION_ONSTACK(completion);

    req->complete = &completion;

    mutex_lock(&ecard_mutex);
    ecard_req = req;
    wake_up(&ecard_wait);

    /*
     * Now wait for kecardd to run.
     */
    wait_for_completion(&completion);
    mutex_unlock(&ecard_mutex);
}

/* ======================= Mid-level card control ===================== */

static void
ecard_readbytes(void *addr, ecard_t *ec, int off, int len, int useld)
{
    struct ecard_request req;

    req.fn      = ecard_task_readbytes;
    req.ec      = ec;
    req.address = off;
    req.length  = len;
    req.use_loader  = useld;
    req.buffer  = addr;

    ecard_call(&req);
}

int ecard_readchunk(struct in_chunk_dir *cd, ecard_t *ec, int id, int num)
{
    struct ex_chunk_dir excd;
    int index = 16;
    int useld = 0;

    if (!ec->cid.cd)
        return 0;

    while(1) {
        ecard_readbytes(&excd, ec, index, 8, useld);
        index += 8;
        if (c_id(&excd) == 0) {
            if (!useld && ec->loader) {
                useld = 1;
                index = 0;
                continue;
            }
            return 0;
        }
        if (c_id(&excd) == 0xf0) { /* link */
            index = c_start(&excd);
            continue;
        }
        if (c_id(&excd) == 0x80) { /* loader */
            if (!ec->loader) {
                ec->loader = kmalloc(c_len(&excd),
                                   GFP_KERNEL);
                if (ec->loader)
                    ecard_readbytes(ec->loader, ec,
                            (int)c_start(&excd),
                            c_len(&excd), useld);
                else
                    return 0;
            }
            continue;
        }
        if (c_id(&excd) == id && num-- == 0)
            break;
    }

    if (c_id(&excd) & 0x80) {
        switch (c_id(&excd) & 0x70) {
        case 0x70:
            ecard_readbytes((unsigned char *)excd.d.string, ec,
                    (int)c_start(&excd), c_len(&excd),
                    useld);
            break;
        case 0x00:
            break;
        }
    }
    cd->start_offset = c_start(&excd);
    memcpy(cd->d.string, excd.d.string, 256);
    return 1;
}

/* ======================= Interrupt control ============================ */

static void ecard_def_irq_enable(ecard_t *ec, int irqnr)
{
}

static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
{
}

static int ecard_def_irq_pending(ecard_t *ec)
{
    return !ec->irqmask || readb(ec->irqaddr) & ec->irqmask;
}

static void ecard_def_fiq_enable(ecard_t *ec, int fiqnr)
{
    panic("ecard_def_fiq_enable called - impossible");
}

static void ecard_def_fiq_disable(ecard_t *ec, int fiqnr)
{
    panic("ecard_def_fiq_disable called - impossible");
}

static int ecard_def_fiq_pending(ecard_t *ec)
{
    return !ec->fiqmask || readb(ec->fiqaddr) & ec->fiqmask;
}

static expansioncard_ops_t ecard_default_ops = {
    ecard_def_irq_enable,
    ecard_def_irq_disable,
    ecard_def_irq_pending,
    ecard_def_fiq_enable,
    ecard_def_fiq_disable,
    ecard_def_fiq_pending
};

/*
 * Enable and disable interrupts from expansion cards.
 * (interrupts are disabled for these functions).
 *
 * They are not meant to be called directly, but via enable/disable_irq.
 */
static void ecard_irq_unmask(struct irq_data *d)
{
    ecard_t *ec = irq_data_get_irq_chip_data(d);

    if (ec) {
        if (!ec->ops)
            ec->ops = &ecard_default_ops;

        if (ec->claimed && ec->ops->irqenable)
            ec->ops->irqenable(ec, d->irq);
        else
            printk(KERN_ERR "ecard: rejecting request to "
                "enable IRQs for %d\n", d->irq);
    }
}

static void ecard_irq_mask(struct irq_data *d)
{
    ecard_t *ec = irq_data_get_irq_chip_data(d);

    if (ec) {
        if (!ec->ops)
            ec->ops = &ecard_default_ops;

        if (ec->ops && ec->ops->irqdisable)
            ec->ops->irqdisable(ec, d->irq);
    }
}

static struct irq_chip ecard_chip = {
    .name       = "ECARD",
    .irq_ack    = ecard_irq_mask,
    .irq_mask   = ecard_irq_mask,
    .irq_unmask = ecard_irq_unmask,
};

void ecard_enablefiq(unsigned int fiqnr)
{
    ecard_t *ec = slot_to_ecard(fiqnr);

    if (ec) {
        if (!ec->ops)
            ec->ops = &ecard_default_ops;

        if (ec->claimed && ec->ops->fiqenable)
            ec->ops->fiqenable(ec, fiqnr);
        else
            printk(KERN_ERR "ecard: rejecting request to "
                "enable FIQs for %d\n", fiqnr);
    }
}

void ecard_disablefiq(unsigned int fiqnr)
{
    ecard_t *ec = slot_to_ecard(fiqnr);

    if (ec) {
        if (!ec->ops)
            ec->ops = &ecard_default_ops;

        if (ec->ops->fiqdisable)
            ec->ops->fiqdisable(ec, fiqnr);
    }
}

static void ecard_dump_irq_state(void)
{
    ecard_t *ec;

    printk("Expansion card IRQ state:\n");

    for (ec = cards; ec; ec = ec->next) {
        if (ec->slot_no == 8)
            continue;

        printk("  %d: %sclaimed, ",
               ec->slot_no, ec->claimed ? "" : "not ");

        if (ec->ops && ec->ops->irqpending &&
            ec->ops != &ecard_default_ops)
            printk("irq %spending\n",
                   ec->ops->irqpending(ec) ? "" : "not ");
        else
            printk("irqaddr %p, mask = %02X, status = %02X\n",
                   ec->irqaddr, ec->irqmask, readb(ec->irqaddr));
    }
}

static void ecard_check_lockup(struct irq_desc *desc)
{
    static unsigned long last;
    static int lockup;

    /*
     * If the timer interrupt has not run since the last million
     * unrecognised expansion card interrupts, then there is
     * something seriously wrong.  Disable the expansion card
     * interrupts so at least we can continue.
     *
     * Maybe we ought to start a timer to re-enable them some time
     * later?
     */
    if (last == jiffies) {
        lockup += 1;
        if (lockup > 1000000) {
            printk(KERN_ERR "\nInterrupt lockup detected - "
                   "disabling all expansion card interrupts\n");

            desc->irq_data.chip->irq_mask(&desc->irq_data);
            ecard_dump_irq_state();
        }
    } else
        lockup = 0;

    /*
     * If we did not recognise the source of this interrupt,
     * warn the user, but don't flood the user with these messages.
     */
    if (!last || time_after(jiffies, last + 5*HZ)) {
        last = jiffies;
        printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
        ecard_dump_irq_state();
    }
}

static void
ecard_irq_handler(unsigned int irq, struct irq_desc *desc)
{
    ecard_t *ec;
    int called = 0;

    desc->irq_data.chip->irq_mask(&desc->irq_data);
    for (ec = cards; ec; ec = ec->next) {
        int pending;

        if (!ec->claimed || !ec->irq || ec->slot_no == 8)
            continue;

        if (ec->ops && ec->ops->irqpending)
            pending = ec->ops->irqpending(ec);
        else
            pending = ecard_default_ops.irqpending(ec);

        if (pending) {
            generic_handle_irq(ec->irq);
            called ++;
        }
    }
    desc->irq_data.chip->irq_unmask(&desc->irq_data);

    if (called == 0)
        ecard_check_lockup(desc);
}

static void __iomem *__ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
{
    void __iomem *address = NULL;
    int slot = ec->slot_no;

    if (ec->slot_no == 8)
        return ECARD_MEMC8_BASE;

    ectcr &= ~(1 << slot);

    switch (type) {
    case ECARD_MEMC:
        if (slot < 4)
            address = ECARD_MEMC_BASE + (slot << 14);
        break;

    case ECARD_IOC:
        if (slot < 4)
            address = ECARD_IOC_BASE + (slot << 14);
        else
            address = ECARD_IOC4_BASE + ((slot - 4) << 14);
        if (address)
            address += speed << 19;
        break;

    case ECARD_EASI:
        address = ECARD_EASI_BASE + (slot << 24);
        if (speed == ECARD_FAST)
            ectcr |= 1 << slot;
        break;

    default:
        break;
    }

#ifdef IOMD_ECTCR
    iomd_writeb(ectcr, IOMD_ECTCR);
#endif
    return address;
}

static int ecard_prints(struct seq_file *m, ecard_t *ec)
{
    seq_printf(m, "  %d: %s ", ec->slot_no, ec->easi ? "EASI" : "    ");

    if (ec->cid.id == 0) {
        struct in_chunk_dir incd;

        seq_printf(m, "[%04X:%04X] ",
            ec->cid.manufacturer, ec->cid.product);

        if (!ec->card_desc && ec->cid.cd &&
            ecard_readchunk(&incd, ec, 0xf5, 0)) {
            ec->card_desc = kmalloc(strlen(incd.d.string)+1, GFP_KERNEL);

            if (ec->card_desc)
                strcpy((char *)ec->card_desc, incd.d.string);
        }

        seq_printf(m, "%s\n", ec->card_desc ? ec->card_desc : "*unknown*");
    } else
        seq_printf(m, "Simple card %d\n", ec->cid.id);

    return 0;
}

static int ecard_devices_proc_show(struct seq_file *m, void *v)
{
    ecard_t *ec = cards;

    while (ec) {
        ecard_prints(m, ec);
        ec = ec->next;
    }
    return 0;
}

static int ecard_devices_proc_open(struct inode *inode, struct file *file)
{
    return single_open(file, ecard_devices_proc_show, NULL);
}

static const struct file_operations bus_ecard_proc_fops = {
    .owner      = THIS_MODULE,
    .open       = ecard_devices_proc_open,
    .read       = seq_read,
    .llseek     = seq_lseek,
    .release    = single_release,
};

static struct proc_dir_entry *proc_bus_ecard_dir = NULL;

static void ecard_proc_init(void)
{
    proc_bus_ecard_dir = proc_mkdir("bus/ecard", NULL);
    proc_create("devices", 0, proc_bus_ecard_dir, &bus_ecard_proc_fops);
}

#define ec_set_resource(ec,nr,st,sz)                \
    do {                            \
        (ec)->resource[nr].name = dev_name(&ec->dev);   \
        (ec)->resource[nr].start = st;          \
        (ec)->resource[nr].end = (st) + (sz) - 1;   \
        (ec)->resource[nr].flags = IORESOURCE_MEM;  \
    } while (0)

static void __init ecard_free_card(struct expansion_card *ec)
{
    int i;

    for (i = 0; i < ECARD_NUM_RESOURCES; i++)
        if (ec->resource[i].flags)
            release_resource(&ec->resource[i]);

    kfree(ec);
}

static struct expansion_card *__init ecard_alloc_card(int type, int slot)
{
    struct expansion_card *ec;
    unsigned long base;
    int i;

    ec = kzalloc(sizeof(ecard_t), GFP_KERNEL);
    if (!ec) {
        ec = ERR_PTR(-ENOMEM);
        goto nomem;
    }

    ec->slot_no = slot;
    ec->easi = type == ECARD_EASI;
    ec->irq = 0;
    ec->fiq = 0;
    ec->dma = NO_DMA;
    ec->ops = &ecard_default_ops;

    dev_set_name(&ec->dev, "ecard%d", slot);
    ec->dev.parent = NULL;
    ec->dev.bus = &ecard_bus_type;
    ec->dev.dma_mask = &ec->dma_mask;
    ec->dma_mask = (u64)0xffffffff;
    ec->dev.coherent_dma_mask = ec->dma_mask;

    if (slot < 4) {
        ec_set_resource(ec, ECARD_RES_MEMC,
                PODSLOT_MEMC_BASE + (slot << 14),
                PODSLOT_MEMC_SIZE);
        base = PODSLOT_IOC0_BASE + (slot << 14);
    } else
        base = PODSLOT_IOC4_BASE + ((slot - 4) << 14);

#ifdef CONFIG_ARCH_RPC
    if (slot < 8) {
        ec_set_resource(ec, ECARD_RES_EASI,
                PODSLOT_EASI_BASE + (slot << 24),
                PODSLOT_EASI_SIZE);
    }

    if (slot == 8) {
        ec_set_resource(ec, ECARD_RES_MEMC, NETSLOT_BASE, NETSLOT_SIZE);
    } else
#endif

    for (i = 0; i <= ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++)
        ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
                base + (i << 19), PODSLOT_IOC_SIZE);

    for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
        if (ec->resource[i].flags &&
            request_resource(&iomem_resource, &ec->resource[i])) {
            dev_err(&ec->dev, "resource(s) not available\n");
            ec->resource[i].end -= ec->resource[i].start;
            ec->resource[i].start = 0;
            ec->resource[i].flags = 0;
        }
    }

 nomem:
    return ec;
}

static ssize_t ecard_show_irq(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct expansion_card *ec = ECARD_DEV(dev);
    return sprintf(buf, "%u\n", ec->irq);
}

static ssize_t ecard_show_dma(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct expansion_card *ec = ECARD_DEV(dev);
    return sprintf(buf, "%u\n", ec->dma);
}

static ssize_t ecard_show_resources(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct expansion_card *ec = ECARD_DEV(dev);
    char *str = buf;
    int i;

    for (i = 0; i < ECARD_NUM_RESOURCES; i++)
        str += sprintf(str, "%08x %08x %08lx\n",
                ec->resource[i].start,
                ec->resource[i].end,
                ec->resource[i].flags);

    return str - buf;
}

static ssize_t ecard_show_vendor(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct expansion_card *ec = ECARD_DEV(dev);
    return sprintf(buf, "%u\n", ec->cid.manufacturer);
}

static ssize_t ecard_show_device(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct expansion_card *ec = ECARD_DEV(dev);
    return sprintf(buf, "%u\n", ec->cid.product);
}

static ssize_t ecard_show_type(struct device *dev, struct device_attribute *attr, char *buf)
{
    struct expansion_card *ec = ECARD_DEV(dev);
    return sprintf(buf, "%s\n", ec->easi ? "EASI" : "IOC");
}

static struct device_attribute ecard_dev_attrs[] = {
    __ATTR(device,   S_IRUGO, ecard_show_device,    NULL),
    __ATTR(dma,      S_IRUGO, ecard_show_dma,       NULL),
    __ATTR(irq,      S_IRUGO, ecard_show_irq,       NULL),
    __ATTR(resource, S_IRUGO, ecard_show_resources, NULL),
    __ATTR(type,     S_IRUGO, ecard_show_type,      NULL),
    __ATTR(vendor,   S_IRUGO, ecard_show_vendor,    NULL),
    __ATTR_NULL,
};


int ecard_request_resources(struct expansion_card *ec)
{
    int i, err = 0;

    for (i = 0; i < ECARD_NUM_RESOURCES; i++) {
        if (ecard_resource_end(ec, i) &&
            !request_mem_region(ecard_resource_start(ec, i),
                    ecard_resource_len(ec, i),
                    ec->dev.driver->name)) {
            err = -EBUSY;
            break;
        }
    }

    if (err) {
        while (i--)
            if (ecard_resource_end(ec, i))
                release_mem_region(ecard_resource_start(ec, i),
                           ecard_resource_len(ec, i));
    }
    return err;
}
EXPORT_SYMBOL(ecard_request_resources);

void ecard_release_resources(struct expansion_card *ec)
{
    int i;

    for (i = 0; i < ECARD_NUM_RESOURCES; i++)
        if (ecard_resource_end(ec, i))
            release_mem_region(ecard_resource_start(ec, i),
                       ecard_resource_len(ec, i));
}
EXPORT_SYMBOL(ecard_release_resources);

void ecard_setirq(struct expansion_card *ec, const struct expansion_card_ops *ops, void *irq_data)
{
    ec->irq_data = irq_data;
    barrier();
    ec->ops = ops;
}
EXPORT_SYMBOL(ecard_setirq);

void __iomem *ecardm_iomap(struct expansion_card *ec, unsigned int res,
               unsigned long offset, unsigned long maxsize)
{
    unsigned long start = ecard_resource_start(ec, res);
    unsigned long end = ecard_resource_end(ec, res);

    if (offset > (end - start))
        return NULL;

    start += offset;
    if (maxsize && end - start > maxsize)
        end = start + maxsize;
    
    return devm_ioremap(&ec->dev, start, end - start);
}
EXPORT_SYMBOL(ecardm_iomap);

/*
 * Probe for an expansion card.
 *
 * If bit 1 of the first byte of the card is set, then the
 * card does not exist.
 */
static int __init ecard_probe(int slot, unsigned irq, card_type_t type)
{
    ecard_t **ecp;
    ecard_t *ec;
    struct ex_ecid cid;
    void __iomem *addr;
    int i, rc;

    ec = ecard_alloc_card(type, slot);
    if (IS_ERR(ec)) {
        rc = PTR_ERR(ec);
        goto nomem;
    }

    rc = -ENODEV;
    if ((addr = __ecard_address(ec, type, ECARD_SYNC)) == NULL)
        goto nodev;

    cid.r_zero = 1;
    ecard_readbytes(&cid, ec, 0, 16, 0);
    if (cid.r_zero)
        goto nodev;

    ec->cid.id  = cid.r_id;
    ec->cid.cd  = cid.r_cd;
    ec->cid.is  = cid.r_is;
    ec->cid.w   = cid.r_w;
    ec->cid.manufacturer = ecard_getu16(cid.r_manu);
    ec->cid.product = ecard_getu16(cid.r_prod);
    ec->cid.country = cid.r_country;
    ec->cid.irqmask = cid.r_irqmask;
    ec->cid.irqoff  = ecard_gets24(cid.r_irqoff);
    ec->cid.fiqmask = cid.r_fiqmask;
    ec->cid.fiqoff  = ecard_gets24(cid.r_fiqoff);
    ec->fiqaddr =
    ec->irqaddr = addr;

    if (ec->cid.is) {
        ec->irqmask = ec->cid.irqmask;
        ec->irqaddr += ec->cid.irqoff;
        ec->fiqmask = ec->cid.fiqmask;
        ec->fiqaddr += ec->cid.fiqoff;
    } else {
        ec->irqmask = 1;
        ec->fiqmask = 4;
    }

    for (i = 0; i < ARRAY_SIZE(blacklist); i++)
        if (blacklist[i].manufacturer == ec->cid.manufacturer &&
            blacklist[i].product == ec->cid.product) {
            ec->card_desc = blacklist[i].type;
            break;
        }

    ec->irq = irq;

    /*
     * hook the interrupt handlers
     */
    if (slot < 8) {
        irq_set_chip_and_handler(ec->irq, &ecard_chip,
                     handle_level_irq);
        irq_set_chip_data(ec->irq, ec);
        set_irq_flags(ec->irq, IRQF_VALID);
    }

#ifdef CONFIG_ARCH_RPC
    /* On RiscPC, only first two slots have DMA capability */
    if (slot < 2)
        ec->dma = 2 + slot;
#endif

    for (ecp = &cards; *ecp; ecp = &(*ecp)->next);

    *ecp = ec;
    slot_to_expcard[slot] = ec;

    rc = device_register(&ec->dev);
    if (rc)
        goto nodev;

    return 0;

 nodev:
    ecard_free_card(ec);
 nomem:
    return rc;
}

/*
 * Initialise the expansion card system.
 * Locate all hardware - interrupt management and
 * actual cards.
 */
static int __init ecard_init(void)
{
    struct task_struct *task;
    int slot, irqbase;

    irqbase = irq_alloc_descs(-1, 0, 8, -1);
    if (irqbase < 0)
        return irqbase;

    task = kthread_run(ecard_task, NULL, "kecardd");
    if (IS_ERR(task)) {
        printk(KERN_ERR "Ecard: unable to create kernel thread: %ld\n",
               PTR_ERR(task));
        irq_free_descs(irqbase, 8);
        return PTR_ERR(task);
    }

    printk("Probing expansion cards\n");

    for (slot = 0; slot < 8; slot ++) {
        if (ecard_probe(slot, irqbase + slot, ECARD_EASI) == -ENODEV)
            ecard_probe(slot, irqbase + slot, ECARD_IOC);
    }

    ecard_probe(8, 11, ECARD_IOC);

    irq_set_chained_handler(IRQ_EXPANSIONCARD, ecard_irq_handler);

    ecard_proc_init();

    return 0;
}

subsys_initcall(ecard_init);

/*
 *  ECARD "bus"
 */
static const struct ecard_id *
ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec)
{
    int i;

    for (i = 0; ids[i].manufacturer != 65535; i++)
        if (ec->cid.manufacturer == ids[i].manufacturer &&
            ec->cid.product == ids[i].product)
            return ids + i;

    return NULL;
}

static int ecard_drv_probe(struct device *dev)
{
    struct expansion_card *ec = ECARD_DEV(dev);
    struct ecard_driver *drv = ECARD_DRV(dev->driver);
    const struct ecard_id *id;
    int ret;

    id = ecard_match_device(drv->id_table, ec);

    ec->claimed = 1;
    ret = drv->probe(ec, id);
    if (ret)
        ec->claimed = 0;
    return ret;
}

static int ecard_drv_remove(struct device *dev)
{
    struct expansion_card *ec = ECARD_DEV(dev);
    struct ecard_driver *drv = ECARD_DRV(dev->driver);

    drv->remove(ec);
    ec->claimed = 0;

    /*
     * Restore the default operations.  We ensure that the
     * ops are set before we change the data.
     */
    ec->ops = &ecard_default_ops;
    barrier();
    ec->irq_data = NULL;

    return 0;
}

/*
 * Before rebooting, we must make sure that the expansion card is in a
 * sensible state, so it can be re-detected.  This means that the first
 * page of the ROM must be visible.  We call the expansion cards reset
 * handler, if any.
 */
static void ecard_drv_shutdown(struct device *dev)
{
    struct expansion_card *ec = ECARD_DEV(dev);
    struct ecard_driver *drv = ECARD_DRV(dev->driver);
    struct ecard_request req;

    if (dev->driver) {
        if (drv->shutdown)
            drv->shutdown(ec);
        ec->claimed = 0;
    }

    /*
     * If this card has a loader, call the reset handler.
     */
    if (ec->loader) {
        req.fn = ecard_task_reset;
        req.ec = ec;
        ecard_call(&req);
    }
}

int ecard_register_driver(struct ecard_driver *drv)
{
    drv->drv.bus = &ecard_bus_type;

    return driver_register(&drv->drv);
}

void ecard_remove_driver(struct ecard_driver *drv)
{
    driver_unregister(&drv->drv);
}

static int ecard_match(struct device *_dev, struct device_driver *_drv)
{
    struct expansion_card *ec = ECARD_DEV(_dev);
    struct ecard_driver *drv = ECARD_DRV(_drv);
    int ret;

    if (drv->id_table) {
        ret = ecard_match_device(drv->id_table, ec) != NULL;
    } else {
        ret = ec->cid.id == drv->id;
    }

    return ret;
}

struct bus_type ecard_bus_type = {
    .name       = "ecard",
    .dev_attrs  = ecard_dev_attrs,
    .match      = ecard_match,
    .probe      = ecard_drv_probe,
    .remove     = ecard_drv_remove,
    .shutdown   = ecard_drv_shutdown,
};

static int ecard_bus_init(void)
{
    return bus_register(&ecard_bus_type);
}

postcore_initcall(ecard_bus_init);

EXPORT_SYMBOL(ecard_readchunk);
EXPORT_SYMBOL(ecard_register_driver);
EXPORT_SYMBOL(ecard_remove_driver);
EXPORT_SYMBOL(ecard_bus_type);