Message-Id: <1205880982.6250.32.camel@localhost.localdomain>
Date:	Tue, 18 Mar 2008 22:56:22 +0000
From:	Adrian McMenamin <adrian@...golddream.dyndns.info>
To:	dwmw2@...radead.org
Cc:	Greg KH <greg@...ah.com>, Paul Mundt <lethal@...ux-sh.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-sh <linux-sh@...r.kernel.org>, linux-mtd@...r.kernel.org
Subject: Re: [PATCH] 2/2 mtd: Add support for the Dreamcast VMU flash

This builds on (though I essentially rewrote most of it) a driver Paul
Mundt and I wrote way back when to support the memory component of the
SEGA Dreamcast's Visual Memory Unit.

The device is accessed via the Dreamcast's maple bus.

Signed-off-by: Adrian McMenamin <adrian@...en.demon.co.uk>
---
diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index 12c2536..c89a610 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -590,5 +590,19 @@ config MTD_PLATRAM
 
 	  This selection automatically selects the map_ram driver.
 
+config MTD_VMU_FLASH
+	tristate "Dreamcast Visual Memory devices and clones"
+	depends on SH_DREAMCAST
+	select MAPLE
+	help
+	  Flash map driver for the SEGA Dreamcast Visual Memory Unit
+	  and clones.
+
+	  Most Dreamcast users will have one of these and so will want
+	  to say Y here.
+
+	  To compile this driver as a module choose M here: the module
+	  will be called vmu_flash.
+
 endmenu
 
diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
index a9cbe80..d5802d2 100644
--- a/drivers/mtd/maps/Makefile
+++ b/drivers/mtd/maps/Makefile
@@ -68,3 +68,4 @@ obj-$(CONFIG_MTD_PLATRAM)	+= plat-ram.o
 obj-$(CONFIG_MTD_OMAP_NOR)	+= omap_nor.o
 obj-$(CONFIG_MTD_MTX1)		+= mtx-1_flash.o
 obj-$(CONFIG_MTD_INTEL_VR_NOR)	+= intel_vr_nor.o
+obj-$(CONFIG_MTD_VMU_FLASH)	+= vmu_flash.o
diff --git a/drivers/mtd/maps/vmu_flash.c b/drivers/mtd/maps/vmu_flash.c
new file mode 100644
index 0000000..ce31134
--- /dev/null
+++ b/drivers/mtd/maps/vmu_flash.c
@@ -0,0 +1,746 @@
+/* vmu-flash.c
+ * Driver for SEGA Dreamcast Visual Memory Unit
+ *
+ * Copyright Adrian McMenamin 2008
+ *
+ * Substantial parts based on code:
+ * Copyright Paul Mundt 2001
+ * Copyright Adrian McMenamin 2002
+ *
+ *
+ * Licensed under version 2 of the
+ * GNU General Public Licence
+ */
+#include <linux/init.h>
+#include <linux/maple.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+#include <asm/mach/maple.h>
+
+static DECLARE_WAIT_QUEUE_HEAD(vmu_read);
+static int block_read;
+
+struct vmu_cache {
+	char *buffer;			/* Cache */
+	unsigned int block;		/* Which block was cached */
+	unsigned long jiffies_atc;	/* Whn was it cached? */
+	int valid;
+};
+
+struct mdev_part {
+	struct maple_device *mdev;
+	int partition;
+};
+
+struct vmupart {
+	u16 user_blocks;
+	u16 root_block;
+	u16 numblocks;
+	char *name;
+	struct vmu_cache *pcache;
+};
+
+struct memcard {
+	u16 tempA;
+	u16 tempB;
+	u32 partitions;
+	u32 blocklen;
+	u32 writecnt;
+	u32 readcnt;
+	u32 removeable;
+	int partition;
+	void *sendbuf;
+	void *blockread;
+	struct vmupart *parts;
+	struct mtd_info *mtd;
+};
+
+struct vmu_block {
+	unsigned int num; /* block number */
+	unsigned int ofs; /* block offset */
+};
+
+static struct vmu_block *ofs_to_block(unsigned long src_ofs,
+	struct mtd_info *mtd, int partition)
+{
+	struct vmu_block *vblock;
+	struct maple_device *mdev;
+	struct memcard *card;
+	struct mdev_part *mpart;
+
+	mpart = mtd->priv;
+	mdev = mpart->mdev;
+	card = mdev->private_data;
+	vblock = kmalloc(sizeof(struct vmu_block), GFP_KERNEL);
+	if (!vblock)
+		goto simple_failed;
+
+	if (src_ofs >= ((card->parts)[partition]).numblocks * card->blocklen)
+		goto failed;
+
+	vblock->num = src_ofs / card->blocklen;
+
+	if (vblock->num > ((card->parts)[partition]).numblocks)
+		goto failed;
+
+	vblock->ofs = src_ofs % card->blocklen;
+	return vblock;
+
+failed:
+	kfree(vblock);
+simple_failed:
+	return NULL;
+}
+
+
+/* Maple bus callback function for reads */
+static void vmu_blockread(struct mapleq *mq)
+{
+	struct maple_device *mdev;
+	struct memcard *card;
+	struct mtd_info *mtd;
+	struct vmu_cache *pcache;
+	struct mdev_part *mpart;
+	int partition;
+
+	mdev = mq->dev;
+	card = mdev->private_data;
+	card->blockread = kmalloc(card->blocklen, GFP_KERNEL);
+	if (!card->blockread)
+		return;
+	memcpy(card->blockread, mq->recvbuf + 12, card->blocklen);
+	block_read = 1;
+	mtd = card->mtd;
+	mpart = mtd->priv;
+	partition = mpart->partition;
+	pcache = (card->parts[partition]).pcache;
+	if (!pcache->buffer)
+		pcache->buffer = kmalloc(card->blocklen, GFP_KERNEL);
+		if (!pcache->buffer)
+			return;
+	memcpy(pcache->buffer, card->blockread, card->blocklen);
+	pcache->block = ((unsigned char *)mq->recvbuf)[11] & 0xFF;
+	pcache->jiffies_atc = jiffies;
+	pcache->valid = 1;
+	wake_up_interruptible(&vmu_read);
+}
+
+/* Interface with maple bus to read bytes */
+static int maple_vmu_read_block(unsigned int num, unsigned char *buf,
+	struct mtd_info *mtd)
+{
+	struct memcard *card;
+	struct mdev_part *mpart;
+	struct maple_device *mdev;
+	int partition, error, locking;
+	void *sendbuf;
+
+	mpart = mtd->priv;
+	mdev = mpart->mdev;
+	partition = mpart->partition;
+	card = mdev->private_data;
+
+	/* wait for the mutex to be available */
+	locking = down_interruptible(&(mdev->mq->sem));
+	if (locking) {
+		printk(KERN_INFO "Maple: VMU at (%d, %d) is locked -"
+			" aborting read\n", mdev->unit, mdev->port);
+		goto fail_nosendbuf;
+	}
+	mdev->mq->command = MAPLE_COMMAND_BREAD;
+	mdev->mq->length = 2;
+
+	sendbuf = kzalloc(mdev->mq->length * 4, GFP_KERNEL);
+	if (!sendbuf) {
+		error = -ENOMEM;
+		goto fail_nosendbuf;
+	}
+
+	((unsigned long *)sendbuf)[0] = cpu_to_be32(MAPLE_FUNC_MEMCARD);
+	((unsigned long *)sendbuf)[1] = cpu_to_be32(partition << 24 | num);
+
+	mdev->mq->sendbuf = sendbuf;
+	block_read = 0;
+
+	maple_getcond_callback(mdev, vmu_blockread, 0, MAPLE_FUNC_MEMCARD);
+	maple_add_packet(mdev->mq);
+	wait_event_interruptible_timeout(vmu_read, block_read, HZ * 4);
+	if (block_read == 0) {
+		printk(KERN_INFO "Maple: VMU read failed on block 0x%X\n", num);
+		goto fail_blockread;
+	}
+
+	memcpy(buf, card->blockread, card->blocklen);
+	kfree(card->blockread);
+	kfree(sendbuf);
+
+	return 0;
+
+fail_blockread:
+	kfree(sendbuf);
+fail_nosendbuf:
+	return -1;
+}
+
+/* communicate with maple bus for phased writing */
+static int maple_vmu_write_block(unsigned int num, const unsigned char *buf,
+	struct mtd_info *mtd)
+{
+	struct memcard *card;
+	struct mdev_part *mpart;
+	struct maple_device *mdev;
+	int partition, error, locking, x, phaselen;
+	void *sendbuf;
+
+	mpart = mtd->priv;
+	mdev = mpart->mdev;
+	partition = mpart->partition;
+	card = mdev->private_data;
+
+	phaselen = card->blocklen/card->writecnt;
+	mdev->mq->command = MAPLE_COMMAND_BWRITE;
+	mdev->mq->length = phaselen / 4 + 2;
+
+	sendbuf = kmalloc(mdev->mq->length * 4, GFP_KERNEL);
+	if (!sendbuf) {
+		error = -ENOMEM;
+		goto fail_nosendbuf;
+	}
+
+	((unsigned long *)sendbuf)[0] = cpu_to_be32(MAPLE_FUNC_MEMCARD);
+
+	for (x = 0; x < card->writecnt; x++) {
+		/* take the lock to protect the contents of sendbuf */
+		locking = down_interruptible(&mdev->mq->sem);
+		if (locking) {
+			error = -EBUSY;
+			goto fail_nolock;
+		}
+		((unsigned long *)sendbuf)[1] =
+			cpu_to_be32(partition << 24 | x << 16 | num);
+		memcpy(sendbuf + 8, buf + phaselen * x, phaselen);
+		mdev->mq->sendbuf = sendbuf;
+		/* wait for the mutex to be available */
+		maple_add_packet(mdev->mq);
+	}
+	/* wait until command is processed */
+	locking = down_interruptible(&mdev->mq->sem);
+	if (locking) {
+		error = -EBUSY;
+		goto fail_nolock;
+	}
+	up(&mdev->mq->sem);
+
+	kfree(sendbuf);
+
+	return card->blocklen;
+
+fail_nolock:
+	printk(KERN_INFO "Maple: VMU at (%d, %d) is locked -"
+		" aborting write\n", mdev->unit, mdev->port);
+	kfree(sendbuf);
+fail_nosendbuf:
+	printk("Maple: VMU (%d, %d): write failed\n", mdev->port, mdev->unit);
+	return error;
+}
+
+/* mtd function to simulate reading byte by byte */
+static unsigned char vmu_flash_read_char(unsigned long ofs, int *retval,
+	struct mtd_info *mtd)
+{
+	struct vmu_block *vblock;
+	struct memcard *card;
+	struct mdev_part *mpart;
+	struct maple_device *mdev;
+	unsigned char *buf, ret;
+	int partition, error;
+
+	mpart = mtd->priv;
+	mdev = mpart->mdev;
+	partition = mpart->partition;
+	card = mdev->private_data;
+	*retval =  0;
+	buf = kmalloc(card->blocklen, GFP_KERNEL);
+	if (!buf) {
+		*retval = 1;
+		error = ENOMEM;
+		goto fail_buffer;
+	}
+
+	vblock = ofs_to_block(ofs, mtd, partition);
+	if (!vblock) {
+		*retval = 3;
+		error = ENOMEM;
+		goto invalid_block;
+	}
+
+	error = maple_vmu_read_block(vblock->num, buf, mtd);
+	if (error) {
+		*retval = 2;
+		goto failed_block;
+	}
+	ret = buf[vblock->ofs];
+	kfree(buf);
+	kfree(vblock);
+	return ret;
+
+failed_block:
+	kfree(vblock);
+invalid_block:
+	kfree(buf);
+fail_buffer:
+	return -error;
+}
+
+/* mtd higher order function to read flash */
+static int vmu_flash_read(struct mtd_info *mtd, loff_t from, size_t len,
+	size_t *retlen,  u_char *buf)
+{
+	struct maple_device *mdev;
+	struct memcard *card;
+	struct mdev_part *mpart;
+	struct vmu_cache *pcache;
+	struct vmu_block *vblock = NULL;
+	int index = 0, retval, partition, leftover, numblocks;
+	unsigned char cx;
+
+	mpart = mtd->priv;
+	mdev = mpart->mdev;
+	partition = mpart->partition;
+	card = mdev->private_data;
+
+	if (len < 1)
+		return -1;
+	numblocks = card->parts[partition].numblocks;
+	if (from + len > numblocks * card->blocklen)
+		len = numblocks * card->blocklen - from;
+	if (len == 0)
+		return -1;
+	/* Have we cached this bit already? */
+	pcache = (card->parts[partition]).pcache;
+	do {
+		if (pcache->valid &&
+		   time_before(jiffies, pcache->jiffies_atc + HZ)) {
+			vblock = ofs_to_block(from + index, mtd, partition);
+			if (!vblock)
+				return -ENOMEM;
+			if (pcache->block == vblock->num) {
+				/*we have cached it, so do necessary copying */
+				leftover = card->blocklen - vblock->ofs;
+				if (leftover > len - index) {
+					/* only a bit of this block to copy */
+					memcpy(buf + index,
+						pcache->buffer + vblock->ofs,
+						len - index);
+					index = len;
+					kfree(vblock);
+					break;
+				}
+				memcpy(buf + index, pcache->buffer +
+					vblock->ofs, leftover);
+				index += leftover;
+			} else {
+				kfree(vblock);
+				vblock = NULL;
+			}
+		}
+		if (!vblock) {
+			/* Not cached */
+			cx = vmu_flash_read_char(from + index, &retval, mtd);
+			if (retval) {
+				*retlen = index;
+				return -1;
+			}
+			memset(buf + index, cx, 1);
+			index++;
+		}
+		kfree(vblock);
+		vblock = NULL;
+	} while (len > index);
+	*retlen = index;
+
+	return 0;
+}
+
+static int vmu_flash_write(struct mtd_info *mtd, loff_t to, size_t len,
+	size_t *retlen, const u_char *buf)
+{
+	struct maple_device *mdev;
+	struct memcard *card;
+	struct mdev_part *mpart;
+	int index = 0, retval, partition, error = 0, numblocks;
+	struct vmu_cache *pcache;
+	struct vmu_block *vblock;
+	unsigned char *buffer;
+
+	mpart = mtd->priv;
+	mdev = mpart->mdev;
+	partition = mpart->partition;
+	card = mdev->private_data;
+
+	/* simple sanity checks */
+	if (len < 1) {
+		error = -1;
+		goto failed;
+	}
+	numblocks = card->parts[partition].numblocks;
+	if (to + len > numblocks * card->blocklen)
+		len = numblocks * card->blocklen - to;
+	if (len == 0) {
+		error = -1;
+		goto failed;
+	}
+
+	vblock = ofs_to_block(to, mtd, partition);
+	if (!vblock) {
+		error = -ENOMEM;
+		goto failed;
+	}
+
+	buffer = kmalloc(card->blocklen, GFP_KERNEL);
+	if (!buffer) {
+		error = -ENOMEM;
+		goto fail_buffer;
+	}
+
+	do {
+
+		/* Read in the block we are to write to */
+		if (maple_vmu_read_block(vblock->num, buffer, mtd)) {
+			error = -EIO;
+			goto fail_io;
+		}
+
+		do {
+			buffer[vblock->ofs] = buf[index];
+			vblock->ofs++;
+			index++;
+			if (index >= len)
+				break;
+		} while (vblock->ofs < card->blocklen);
+		/* write out new buffer */
+		retval = maple_vmu_write_block(vblock->num, buffer, mtd);
+		/* invalidare the cache */
+		pcache = (card->parts[partition]).pcache;
+		pcache->valid = 0;
+
+		if (retval != card->blocklen) {
+			error = -EIO;
+			goto fail_io;
+		}
+
+		vblock->num++;
+		vblock->ofs = 0;
+	} while (len > index);
+
+	kfree(buffer);
+	*retlen = index;
+	kfree(vblock);
+	return 0;
+
+fail_io:
+	kfree(buffer);
+fail_buffer:
+	kfree(vblock);
+failed:
+	printk(KERN_INFO "Maple: VMU write failing with error %d\n", error);
+	return error;
+}
+
+static int vmu_flash_erase(struct mtd_info *mtd, struct erase_info *erase)
+{
+	int z;
+	erase->state = MTD_ERASING;
+	vmu_flash_write(mtd, erase->addr, erase->len, &z, "\0");
+	erase->state = MTD_ERASE_DONE;
+	if (erase->callback)
+		(erase->callback) (erase);
+	return 0;
+}
+
+static void vmu_flash_sync(struct mtd_info *mtd)
+{
+	/* Do nothing */
+}
+
+/* Maple bus callback function to recursively query hardware details */
+static void vmu_queryblocks(struct mapleq *mq)
+{
+	struct maple_device *mdev;
+	unsigned short *res;
+	struct memcard *card;
+	void *sendbuf;
+	struct vmu_cache *pcache;
+	struct mdev_part *mpart;
+	struct mtd_info *mtd_cur;
+	struct vmupart *part_cur;
+	int error, locking;
+
+	mdev = mq->dev;
+	card = mdev->private_data;
+	res = mq->recvbuf;
+	card->tempA = res[12];
+	card->tempB = res[6];
+
+	printk(KERN_INFO "Maple: VMU device at partition %d has %d user "
+		"blocks with a root block at %d\n", card->partition,
+		card->tempA, card->tempB);
+
+	part_cur = &((card->parts)[card->partition]);
+	part_cur->user_blocks = card->tempA;
+	part_cur->root_block = card->tempB;
+	part_cur->numblocks = card->tempB + 1;
+	part_cur->name = kmalloc(12, GFP_KERNEL);
+	if (!part_cur->name)
+		goto fail_name;
+
+	sprintf(part_cur->name, "vmu%d.%d.%d",
+		mdev->port, mdev->unit, card->partition);
+	mtd_cur = &((card->mtd)[card->partition]);
+	mtd_cur->name = part_cur->name;
+	mtd_cur->type = MTD_NORFLASH;
+	mtd_cur->flags = MTD_CAP_NORFLASH;
+	mtd_cur->size = part_cur->numblocks * card->blocklen;
+	mtd_cur->erasesize = card->blocklen;
+	mtd_cur->write = vmu_flash_write;
+	mtd_cur->read = vmu_flash_read;
+	mtd_cur->erase = vmu_flash_erase;
+	mtd_cur->sync = vmu_flash_sync;
+	mtd_cur->writesize = card->blocklen;
+
+	mpart = kmalloc(sizeof(struct mdev_part), GFP_KERNEL);
+	if (!mpart)
+		goto fail_mpart;
+
+	mpart->mdev = mdev;
+	mpart->partition = card->partition;
+	mtd_cur->priv = mpart;
+	mtd_cur->owner = THIS_MODULE;
+
+	pcache = kmalloc(sizeof(struct vmu_cache), GFP_KERNEL);
+	if (!pcache)
+		goto fail_cache_create;
+	pcache->buffer = NULL;
+	pcache->valid = 0;
+	part_cur->pcache = pcache;
+
+	error = add_mtd_device(mtd_cur);
+	if (error)
+		goto fail_mtd_register;
+
+	kfree(card->sendbuf);
+	maple_getcond_callback(mdev, NULL, 0,
+		MAPLE_FUNC_MEMCARD);
+
+	if (++(card->partition) < card->partitions) {
+		mdev->mq->command = MAPLE_COMMAND_GETMINFO;
+		mdev->mq->length = 2;
+
+		sendbuf = kzalloc(mdev->mq->length * 4, GFP_KERNEL);
+		if (!sendbuf) {
+			error = -ENOMEM;
+			goto fail_nosendbuf;
+		}
+		card->sendbuf = sendbuf;
+		mdev->mq->sendbuf = sendbuf;
+		maple_getcond_callback(mdev, vmu_queryblocks, 0,
+			MAPLE_FUNC_MEMCARD);
+
+		locking = down_interruptible(&(mdev->mq->sem));
+		if (!locking)
+			maple_add_packet(mdev->mq);
+	}
+
+	return;
+
+fail_mtd_register:
+	printk("mtd: Could not register maple device at (%d, %d)\n",
+		mdev->port, mdev->unit);
+	for (error = 0; error <= card->partition; error++) {
+		kfree(((card->parts)[error]).pcache);
+		((card->parts)[error]).pcache = NULL;
+	}
+fail_cache_create:
+	kfree(card->sendbuf);
+fail_mpart:
+	for (error = 0; error <= card->partition; error++) {
+		kfree(((card->mtd)[error]).priv);
+		((card->mtd)[error]).priv = NULL;
+	}
+fail_nosendbuf:
+	maple_getcond_callback(mdev, NULL, 0,
+		MAPLE_FUNC_MEMCARD);
+	kfree(part_cur->name);
+fail_name:
+	return;
+}
+
+static int vmu_connect(struct maple_device *mdev)
+{
+	unsigned long test_flash_data, basic_flash_data;
+	int c, locking, error = 0;
+	struct memcard *card;
+	void *sendbuf;
+
+	test_flash_data = be32_to_cpu(mdev->devinfo.function);
+	/* Need to count how many bits are set - to find out which
+	* function_data element has details of the memory card:
+	* using Brian Kernighan's/Peter Wegner's method */
+	for (c = 0; test_flash_data; c++)
+		test_flash_data &= test_flash_data - 1;
+
+	basic_flash_data = be32_to_cpu(mdev->devinfo.function_data[c - 1]);
+
+	card = kmalloc(sizeof(struct memcard), GFP_KERNEL);
+	if (!card) {
+		error = ENOMEM;
+		goto fail_nomem;
+	}
+
+	card->partitions = ((basic_flash_data >> 24) & 0xFF) + 1;
+	card->blocklen = (((basic_flash_data >> 16) & 0xFF) + 1) << 5;
+	card->writecnt = (basic_flash_data >> 12) & 0xF;
+	card->readcnt = (basic_flash_data >> 8) & 0xF;
+	card->removeable = (basic_flash_data >> 7) & 1;
+
+	card->partition = 0;
+	/* Not sure there are actually any multi-partition devices in the
+	* real world, but the hardware supports them, so, so will we */
+	card->parts = kmalloc(sizeof(struct vmupart) * card->partitions,
+		GFP_KERNEL);
+	if (!card->parts) {
+		error = -ENOMEM;
+		goto fail_partitions;
+	}
+	/*kzalloc this to ensure safe kfree-ing of NULL mparts on error*/
+	card->mtd = kzalloc(sizeof(struct mtd_info) * card->partitions,
+		GFP_KERNEL);
+	if (!card->mtd) {
+		error = -ENOMEM;
+		goto fail_mtd_info;
+	}
+
+	mdev->private_data = card;
+
+	/* Now query the device to find out about blocks */
+	mdev->mq->command = MAPLE_COMMAND_GETMINFO;
+	mdev->mq->length = 2;
+
+	sendbuf = kzalloc(mdev->mq->length * 4, GFP_KERNEL);
+	if (!sendbuf) {
+		error = -ENOMEM;
+		goto fail_nosendbuf;
+	}
+	card->sendbuf = sendbuf;
+	mdev->mq->sendbuf = sendbuf;
+
+	((unsigned long *)(mdev->mq->sendbuf))[0] =
+		cpu_to_be32(MAPLE_FUNC_MEMCARD);
+
+	maple_getcond_callback(mdev, vmu_queryblocks, 0,
+		MAPLE_FUNC_MEMCARD);
+
+	locking = down_interruptible(&(mdev->mq->sem));
+	if (!locking)
+		maple_add_packet(mdev->mq);
+
+	return 0;
+
+fail_nosendbuf:
+	kfree(card->mtd);
+fail_mtd_info:
+	kfree(card->parts);
+fail_partitions:
+	kfree(card);
+fail_nomem:
+	return -error;
+}
+
+static void vmu_disconnect(struct maple_device *mdev)
+{
+	struct memcard *card;
+	int x, locking;
+
+	locking = down_interruptible(&mdev->mq->sem);
+	if (locking) {
+		printk(KERN_INFO "Maple: Could not disconnect VMU device at:"
+			"(%d, %d)\n", mdev->port, mdev->unit);
+		return;
+	}
+	mdev->callback = NULL;
+	card = mdev->private_data;
+	for (x = 0; x < card->partitions; x++) {
+		del_mtd_device(&((card->mtd)[x]));
+		kfree(((card->parts)[x]).name);
+	}
+	kfree(card->parts);
+	kfree(card->mtd);
+	kfree(card);
+	up(&mdev->mq->sem);
+
+}
+
+static int probe_maple_vmu(struct device *dev)
+{
+	int error;
+	struct maple_device *mdev = to_maple_dev(dev);
+	struct maple_driver *mdrv = to_maple_driver(dev->driver);
+
+	error = vmu_connect(mdev);
+	if (error)
+		return error;
+
+	mdev->driver = mdrv;
+
+	return 0;
+}
+
+static int remove_maple_vmu(struct device *dev)
+{
+	struct maple_device *mdev = to_maple_dev(dev);
+
+	vmu_disconnect(mdev);
+	return 0;
+}
+
+static struct maple_driver vmu_flash_driver = {
+	.function =	MAPLE_FUNC_MEMCARD,
+	.connect =	vmu_connect,
+	.disconnect =	vmu_disconnect,
+	.drv = {
+		.name = "Dreamcast_visual_memory",
+		.probe = probe_maple_vmu,
+		.remove = remove_maple_vmu,
+	},
+};
+
+static int unplug_vmu_flash(struct device *dev, void *ignored)
+{
+	struct maple_device *mdev;
+
+	mdev = to_maple_dev(dev);
+	if ((mdev->function & MAPLE_FUNC_MEMCARD)
+		&& (mdev->driver == &vmu_flash_driver))
+		remove_maple_vmu(dev);
+
+	return 0;
+}
+
+static int __init vmu_flash_map_init(void)
+{
+	maple_driver_register(&vmu_flash_driver.drv);
+	return 0;
+}
+
+static void __exit vmu_flash_map_exit(void)
+{
+	bus_for_each_dev(&maple_bus_type, NULL, NULL, unplug_vmu_flash);
+	driver_unregister(&vmu_flash_driver.drv);
+}
+
+module_init(vmu_flash_map_init);
+module_exit(vmu_flash_map_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Adrian McMenamin, Paul Mundt");
+MODULE_DESCRIPTION("Flash mapping for Sega Dreamcast visual memory");

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