ARM: riscpc: move ecard.c to arch/arm/mach-rpc

RiscPC is the only platform using the Acorn expansion card support, so
move it into its mach-* directory.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 1301 insertions, 1 deletions

diff --git a/arch/arm/mach-rpc/Makefile b/arch/arm/mach-rpc/Makefile
index 69f2c0656966..f89320739b09 100644
--- a/arch/arm/mach-rpc/Makefile
+++ b/arch/arm/mach-rpc/Makefile
@@ -4,7 +4,7 @@
 
 # Object file lists.
 
-obj-y			:= dma.o irq.o riscpc.o time.o
+obj-y			:= dma.o ecard.o irq.o riscpc.o time.o
 obj-m			:=
 obj-n			:=
 obj-			:=
diff --git a/arch/arm/mach-rpc/ecard.c b/arch/arm/mach-rpc/ecard.c
new file mode 100644
index 000000000000..4dd0edab6a65
--- /dev/null
+++ b/arch/arm/mach-rpc/ecard.c
@@ -0,0 +1,1231 @@
+/*
+ *  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/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"
+
+#ifndef CONFIG_ARCH_RPC
+#define HAVE_EXPMASK
+#endif
+
+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;
+#ifdef HAS_EXPMASK
+static unsigned int have_expmask;
+#endif
+
+/* 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_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)
+{
+#ifdef HAS_EXPMASK
+	if (irqnr < 4 && have_expmask) {
+		have_expmask |= 1 << irqnr;
+		__raw_writeb(have_expmask, EXPMASK_ENABLE);
+	}
+#endif
+}
+
+static void ecard_def_irq_disable(ecard_t *ec, int irqnr)
+{
+#ifdef HAS_EXPMASK
+	if (irqnr < 4 && have_expmask) {
+		have_expmask &= ~(1 << irqnr);
+		__raw_writeb(have_expmask, EXPMASK_ENABLE);
+	}
+#endif
+}
+
+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 = slot_to_ecard(d->irq - 32);
+
+	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 = slot_to_ecard(d->irq - 32);
+
+	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 == 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) {
+			generic_handle_irq(ec->irq);
+			called ++;
+		}
+	}
+	desc->irq_data.chip->irq_unmask(&desc->irq_data);
+
+	if (called == 0)
+		ecard_check_lockup(desc);
+}
+
+#ifdef HAS_EXPMASK
+static unsigned char priority_masks[] =
+{
+	0xf0, 0xf1, 0xf3, 0xf7, 0xff, 0xff, 0xff, 0xff
+};
+
+static unsigned char first_set[] =
+{
+	0x00, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00,
+	0x03, 0x00, 0x01, 0x00, 0x02, 0x00, 0x01, 0x00
+};
+
+static void
+ecard_irqexp_handler(unsigned int irq, struct irq_desc *desc)
+{
+	const unsigned int statusmask = 15;
+	unsigned int status;
+
+	status = __raw_readb(EXPMASK_STATUS) & statusmask;
+	if (status) {
+		unsigned int slot = first_set[status];
+		ecard_t *ec = slot_to_ecard(slot);
+
+		if (ec->claimed) {
+			/*
+			 * this ugly code is so that we can operate a
+			 * prioritorising system:
+			 *
+			 * Card 0 	highest priority
+			 * Card 1
+			 * Card 2
+			 * Card 3	lowest priority
+			 *
+			 * Serial cards should go in 0/1, ethernet/scsi in 2/3
+			 * otherwise you will lose serial data at high speeds!
+			 */
+			generic_handle_irq(ec->irq);
+		} else {
+			printk(KERN_WARNING "card%d: interrupt from unclaimed "
+			       "card???\n", slot);
+			have_expmask &= ~(1 << slot);
+			__raw_writeb(have_expmask, EXPMASK_ENABLE);
+		}
+	} else
+		printk(KERN_WARNING "Wild interrupt from backplane (masks)\n");
+}
+
+static int __init ecard_probeirqhw(void)
+{
+	ecard_t *ec;
+	int found;
+
+	__raw_writeb(0x00, EXPMASK_ENABLE);
+	__raw_writeb(0xff, EXPMASK_STATUS);
+	found = (__raw_readb(EXPMASK_STATUS) & 15) == 0;
+	__raw_writeb(0xff, EXPMASK_ENABLE);
+
+	if (found) {
+		printk(KERN_DEBUG "Expansion card interrupt "
+		       "management hardware found\n");
+
+		/* for each card present, set a bit to '1' */
+		have_expmask = 0x80000000;
+
+		for (ec = cards; ec; ec = ec->next)
+			have_expmask |= 1 << ec->slot_no;
+
+		__raw_writeb(have_expmask, EXPMASK_ENABLE);
+	}
+
+	return found;
+}
+#else
+#define ecard_irqexp_handler NULL
+#define ecard_probeirqhw() (0)
+#endif
+
+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 = NO_IRQ;
+	ec->fiq = NO_IRQ;
+	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, 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;
+		}
+
+	/*
+	 * hook the interrupt handlers
+	 */
+	if (slot < 8) {
+		ec->irq = 32 + slot;
+		irq_set_chip_and_handler(ec->irq, &ecard_chip,
+					 handle_level_irq);
+		set_irq_flags(ec->irq, IRQF_VALID);
+	}
+
+	if (slot == 8)
+		ec->irq = 11;
+#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;
+
+	device_register(&ec->dev);
+
+	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, irqhw;
+
+	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));
+		return PTR_ERR(task);
+	}
+
+	printk("Probing expansion cards\n");
+
+	for (slot = 0; slot < 8; slot ++) {
+		if (ecard_probe(slot, ECARD_EASI) == -ENODEV)
+			ecard_probe(slot, ECARD_IOC);
+	}
+
+	ecard_probe(8, ECARD_IOC);
+
+	irqhw = ecard_probeirqhw();
+
+	irq_set_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);
+
+	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);
diff --git a/arch/arm/mach-rpc/ecard.h b/arch/arm/mach-rpc/ecard.h
new file mode 100644
index 000000000000..4642d436be2a
--- /dev/null
+++ b/arch/arm/mach-rpc/ecard.h
@@ -0,0 +1,69 @@
+/*
+ *  ecard.h
+ *
+ *  Copyright 2007 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.
+ */
+
+/* Definitions internal to ecard.c - for it's use only!!
+ *
+ * External expansion card header as read from the card
+ */
+struct ex_ecid {
+	unsigned char	r_irq:1;
+	unsigned char	r_zero:1;
+	unsigned char	r_fiq:1;
+	unsigned char	r_id:4;
+	unsigned char	r_a:1;
+
+	unsigned char	r_cd:1;
+	unsigned char	r_is:1;
+	unsigned char	r_w:2;
+	unsigned char	r_r1:4;
+
+	unsigned char	r_r2:8;
+
+	unsigned char	r_prod[2];
+
+	unsigned char	r_manu[2];
+
+	unsigned char	r_country;
+
+	unsigned char	r_fiqmask;
+	unsigned char	r_fiqoff[3];
+
+	unsigned char	r_irqmask;
+	unsigned char	r_irqoff[3];
+};
+
+/*
+ * Chunk directory entry as read from the card
+ */
+struct ex_chunk_dir {
+	unsigned char r_id;
+	unsigned char r_len[3];
+	unsigned long r_start;
+	union {
+		char string[256];
+		char data[1];
+	} d;
+#define c_id(x)		((x)->r_id)
+#define c_len(x)	((x)->r_len[0]|((x)->r_len[1]<<8)|((x)->r_len[2]<<16))
+#define c_start(x)	((x)->r_start)
+};
+
+typedef enum ecard_type {		/* Cards address space		*/
+	ECARD_IOC,
+	ECARD_MEMC,
+	ECARD_EASI
+} card_type_t;
+
+typedef enum {				/* Speed for ECARD_IOC space	*/
+	ECARD_SLOW	 = 0,
+	ECARD_MEDIUM	 = 1,
+	ECARD_FAST	 = 2,
+	ECARD_SYNC	 = 3
+} card_speed_t;