1 files changed, 850 insertions, 0 deletions

diff --git a/arch/arm26/kernel/ecard.c b/arch/arm26/kernel/ecard.c
new file mode 100644
index 000000000000..824c6b571ad9
--- /dev/null
+++ b/arch/arm26/kernel/ecard.c
@@ -0,0 +1,850 @@
+/*
+ *  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/mmu_context.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->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)
+                        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;
+
+        ectcr &= ~(1 << slot);
+
+        switch (type) {
+        case ECARD_MEMC:
+                address = IO_EC_MEMC_BASE + (slot << 12);
+                break;
+
+        case ECARD_IOC:
+                address = IO_EC_IOC_BASE + (slot << 12) + (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;
+
+        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
+         */
+        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 < MAX_ECARDS; 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);