initial commit with v2.6.9

[linux-2.6.9-moxart.git] / arch / arm26 / kernel / ecard.c

/*
 *  linux/arch/arm26/kernel/ecard.c
 *
 *  Copyright 1995-2001 Russell King
 *  Copyright 2003 Ian Molton
 *
 * 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
 *  15-Jun-2003 IM      Modified from ARM32 (RiscPC capable) version
 *  10-Jan-1999 RMK     Run loaders in a simulated RISC OS environment.
 *  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).
 *
 */
#define ECARD_C

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/device.h>
#include <linux/init.h>

#include <asm/dma.h>
#include <asm/ecard.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
#include <asm/irq.h>
#include <asm/irqchip.h>
#include <asm/tlbflush.h>

enum req {
        req_readbytes,
        req_reset
};

struct ecard_request {
        enum req        req;
        ecard_t         *ec;
        unsigned int    address;
        unsigned int    length;
        unsigned int    use_loader;
        void            *buffer;
};

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(volatile unsigned char *pa, loader_t loader);
asmlinkage extern int
ecard_loader_read(int off, volatile unsigned char *pa, loader_t loader);

static const struct ecard_id *
ecard_match_device(const struct ecard_id *ids, struct expansion_card *ec);

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.
 */
#define BUS_ADDR(x) ((((unsigned long)(x)) << 2) + IO_BASE)
#define POD_INT_ADDR(x) ((volatile unsigned char *)\
                         ((BUS_ADDR((x)) - IO_BASE) + IO_START))

static inline void ecard_task_reset(struct ecard_request *req)
{
        struct expansion_card *ec = req->ec;
        if (ec->loader)
                ecard_loader_reset(POD_INT_ADDR(ec->podaddr), ec->loader);
}

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

        if (req->ec->slot_no == 8) {
                /*
                 * 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) {
                        *base_addr = 0;
                        index = 0;
                }

                /*
                 * Increment the hardware index counter until we get to the
                 * required offset.  The read bytes are discarded.
                 */
                while (index < off) {
                        unsigned char byte;
                        byte = base_addr[page];
                        index += 1;
                }

                while (len--) {
                        *buf++ = base_addr[page];
                        index += 1;
                }
        } else {

                if (!req->use_loader || !req->ec->loader) {
                        off *= 4;
                        while (len--) {
                                *buf++ = base_addr[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_addr,
                                                           req->ec->loader);
                        }
                }
        }

}

static void ecard_do_request(struct ecard_request *req)
{
        switch (req->req) {
        case req_readbytes:
                ecard_task_readbytes(req);
                break;

        case req_reset:
                ecard_task_reset(req);
                break;
        }
}

/*
 * On 26-bit processors, we don't need the kcardd thread to access the
 * expansion card loaders.  We do it directly.
 */
#define ecard_call(req) ecard_do_request(req)

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

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

        req.req         = req_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 = (loader_t)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 || ec->irqaddr[0] & 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 || ec->fiqaddr[0] & 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(unsigned int irqnr)
{
        ecard_t *ec = slot_to_ecard(irqnr - 32);

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

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

static void ecard_irq_mask(unsigned int irqnr)
{
        ecard_t *ec = slot_to_ecard(irqnr - 32);

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

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

static struct irqchip ecard_chip = {
        .ack    = ecard_irq_mask,
        .mask   = ecard_irq_mask,
        .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(ecard_t *ec)
{
        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, *ec->irqaddr);
}

static void ecard_check_lockup(struct irqdesc *desc)
{
        static int last, lockup;
        ecard_t *ec;

        /*
         * 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->chip->mask(IRQ_EXPANSIONCARD);

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

                        for (ec = cards; ec; ec = ec->next)
                                ecard_dump_irq_state(ec);
                }
        } 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, (unsigned long)(last + 5*HZ))) {
                last = jiffies;
                printk(KERN_WARNING "Unrecognised interrupt from backplane\n");
        }
}

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

        desc->chip->mask(irq);
        for (ec = cards; ec; ec = ec->next) {
                int pending;

                if (!ec->claimed || ec->irq == NO_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) {
                        struct irqdesc *d = irq_desc + ec->irq;
                        d->handle(ec->irq, d, regs);
                        called ++;
                }
        }
        desc->chip->unmask(irq);

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

#define ecard_irqexp_handler NULL
#define ecard_probeirqhw() (0)

unsigned int ecard_address(ecard_t *ec, card_type_t type, card_speed_t speed)
{
        unsigned long address = 0;
        int slot = ec->slot_no;

        if (ec->slot_no == 8)
                return 0;

        ectcr &= ~(1 << slot);

        switch (type) {
        case ECARD_MEMC:
                if (slot < 4)
                        address = IO_EC_MEMC_BASE + (slot << 12);
                break;

        case ECARD_IOC:
                if (slot < 4)
                        address = IO_EC_IOC_BASE + (slot << 12);
                if (address)
                        address +=  speed << 17;
                break;

        default:
                break;
        }

        return address;
}

static int ecard_prints(char *buffer, ecard_t *ec)
{
        char *start = buffer;

        buffer += sprintf(buffer, "  %d: ", ec->slot_no);

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

                buffer += sprintf(buffer, "[%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);
                }

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

        return buffer - start;
}

static int get_ecard_dev_info(char *buf, char **start, off_t pos, int count)
{
        ecard_t *ec = cards;
        off_t at = 0;
        int len, cnt;

        cnt = 0;
        while (ec && count > cnt) {
                len = ecard_prints(buf, ec);
                at += len;
                if (at >= pos) {
                        if (!*start) {
                                *start = buf + (pos - (at - len));
                                cnt = at - pos;
                        } else
                                cnt += len;
                        buf += len;
                }
                ec = ec->next;
        }
        return (count > cnt) ? cnt : count;
}

static struct proc_dir_entry *proc_bus_ecard_dir = NULL;

static void ecard_proc_init(void)
{
        proc_bus_ecard_dir = proc_mkdir("ecard", proc_bus);
        create_proc_info_entry("devices", 0, proc_bus_ecard_dir,
                get_ecard_dev_info);
}

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

static void __init ecard_init_resources(struct expansion_card *ec)
{
        unsigned long base = PODSLOT_IOC0_BASE;
        unsigned int slot = ec->slot_no;
        int i;

        if (slot < 4) {
                ec_set_resource(ec, ECARD_RES_MEMC,
                                PODSLOT_MEMC_BASE + (slot << 14),
                                PODSLOT_MEMC_SIZE, IORESOURCE_MEM);
        }

        for (i = 0; i < ECARD_RES_IOCSYNC - ECARD_RES_IOCSLOW; i++) {
                ec_set_resource(ec, i + ECARD_RES_IOCSLOW,
                                base + (slot << 14) + (i << 19),
                                PODSLOT_IOC_SIZE, IORESOURCE_MEM);
        }

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

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

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

static ssize_t ecard_show_dma(struct device *dev, 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, 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, "%08lx %08lx %08lx\n",
                                ec->resource[i].start,
                                ec->resource[i].end,
                                ec->resource[i].flags);

        return str - buf;
}

static DEVICE_ATTR(irq, S_IRUGO, ecard_show_irq, NULL);
static DEVICE_ATTR(vendor, S_IRUGO, ecard_show_vendor, NULL);
static DEVICE_ATTR(device, S_IRUGO, ecard_show_device, NULL);
static DEVICE_ATTR(dma, S_IRUGO, ecard_show_dma, NULL);
static DEVICE_ATTR(resource, S_IRUGO, ecard_show_resources, NULL);

/*
 * 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, card_type_t type)
{
        ecard_t **ecp;
        ecard_t *ec;
        struct ex_ecid cid;
        int i, rc = -ENOMEM;

        ec = kmalloc(sizeof(ecard_t), GFP_KERNEL);
        if (!ec)
                goto nomem;

        memset(ec, 0, sizeof(ecard_t));

        ec->slot_no     = slot;
        ec->type        = type;
        ec->irq         = NO_IRQ;
        ec->fiq         = NO_IRQ;
        ec->dma         = NO_DMA;
        ec->card_desc   = NULL;
        ec->ops         = &ecard_default_ops;

        rc = -ENODEV;
        if ((ec->podaddr = ecard_address(ec, type, ECARD_SYNC)) == 0)
                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     = (unsigned char *)ioaddr(ec->podaddr);

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

        snprintf(ec->dev.bus_id, sizeof(ec->dev.bus_id), "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;

        ecard_init_resources(ec);

        /*
         * hook the interrupt handlers
         */
        if (slot < 8) {
                ec->irq = 32 + slot;
                set_irq_chip(ec->irq, &ecard_chip);
                set_irq_handler(ec->irq, do_level_IRQ);
                set_irq_flags(ec->irq, IRQF_VALID);
        }

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

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

        device_register(&ec->dev);
        device_create_file(&ec->dev, &dev_attr_dma);
        device_create_file(&ec->dev, &dev_attr_irq);
        device_create_file(&ec->dev, &dev_attr_resource);
        device_create_file(&ec->dev, &dev_attr_vendor);
        device_create_file(&ec->dev, &dev_attr_device); 

        return 0;

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

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

        printk("Probing expansion cards\n");

        for (slot = 0; slot < 4; slot ++) {
                ecard_probe(slot, ECARD_IOC);
        }

        irqhw = ecard_probeirqhw();

        set_irq_chained_handler(IRQ_EXPANSIONCARD,
                                irqhw ? ecard_irqexp_handler : 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);

        ecard_claim(ec);
        ret = drv->probe(ec, id);
        if (ret)
                ecard_release(ec);
        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);
        ecard_release(ec);

        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 (drv->shutdown)
                drv->shutdown(ec);
        ecard_release(ec);
        req.req = req_reset;
        req.ec = ec;
        ecard_call(&req);
}

int ecard_register_driver(struct ecard_driver *drv)
{
        drv->drv.bus = &ecard_bus_type;
        drv->drv.probe = ecard_drv_probe;
        drv->drv.remove = ecard_drv_remove;
        drv->drv.shutdown = ecard_drv_shutdown;

        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",
        .match  = ecard_match,
};

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

postcore_initcall(ecard_bus_init);

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