Re: [PATCH] sh: maple: Add support for VMU devices (v4) [1/3]

Adrian McMenamin
2009-02-03T17:04:23Z

Adding support for the Dreamcast VMU as an MTD map.

The VMU is a smart (microcontroller governed) flash-based peripheral for
the SEGA Dreamcast, attached through SEGA's proprietary Maple bus.

Signed-off-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
---

diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index 0225cbb..9b3e564 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -551,5 +551,15 @@ config MTD_PLATRAM

This selection automatically selects the map_ram driver.

-endmenu
+config MTD_VMU
+ tristate "Map driver for Dreamcast VMU"
+ depends on MAPLE
+ help
+ This driver enables access to the Dreamcast Visual Memory Unit (VMU).
+
+ Most Dreamcast users will want to say Y here.

+ To build this as a module select M here, the module will be called
+ vmu-flash.
+
+endmenu
diff --git a/drivers/mtd/maps/Makefile b/drivers/mtd/maps/Makefile
index 6d9ba35..26b28a7 100644
--- a/drivers/mtd/maps/Makefile
+++ b/drivers/mtd/maps/Makefile
@@ -61,3 +61,4 @@ obj-$(CONFIG_MTD_PLATRAM) += plat-ram.o
obj-$(CONFIG_MTD_OMAP_NOR) += omap_nor.o
obj-$(CONFIG_MTD_INTEL_VR_NOR) += intel_vr_nor.o
obj-$(CONFIG_MTD_BFIN_ASYNC) += bfin-async-flash.o
+obj-$(CONFIG_MTD_VMU) += 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..e7138c2
--- /dev/null
+++ b/drivers/mtd/maps/vmu-flash.c
@@ -0,0 +1,825 @@
+/* vmu-flash.c
+ * Driver for SEGA Dreamcast Visual Memory Unit
+ *
+ * Copyright (c) Adrian McMenamin 2002 - 2009
+ * Copyright (c) Paul Mundt 2001
+ *
+ * Licensed under version 2 of the
+ * GNU General Public Licence
+ */
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/maple.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/map.h>
+
+struct vmu_cache {
+ unsigned char *buffer; /* Cache */
+ unsigned int block; /* Which block was cached */
+ unsigned long jiffies_atc; /* When 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;
+ int read;
+ unsigned char *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;
+ int num;
+
+ mpart = mtd->priv;
+ mdev = mpart->mdev;
+ card = maple_get_drvdata(mdev);
+
+ if (src_ofs >= card->parts[partition].numblocks * card->blocklen)
+ goto failed;
+
+ num = src_ofs / card->blocklen;
+ if (num > card->parts[partition].numblocks)
+ goto failed;
+
+ vblock = kmalloc(sizeof(struct vmu_block), GFP_KERNEL);
+ if (!vblock)
+ goto failed;
+
+ vblock->num = num;
+ vblock->ofs = src_ofs % card->blocklen;
+ return vblock;
+
+failed:
+ return NULL;
+}
+
+/* Maple bus callback function for reads */
+static void vmu_blockread(struct mapleq *mq)
+{
+ struct maple_device *mdev;
+ struct memcard *card;
+
+ mdev = mq->dev;
+ card = maple_get_drvdata(mdev);
+ /* copy the read in data */
+
+ if (unlikely(!card->blockread))
+ return;
+
+ memcpy(card->blockread, mq->recvbuf->buf + 12,
+ card->blocklen/card->readcnt);
+
+}
+
+/* Interface with maple bus to read blocks
+ * caching the results so that other parts
+ * of the driver can access block reads */
+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 = 0, x, wait;
+ unsigned char *blockread = NULL;
+ struct vmu_cache *pcache;
+ __be32 sendbuf;
+
+ mpart = mtd->priv;
+ mdev = mpart->mdev;
+ partition = mpart->partition;
+ card = maple_get_drvdata(mdev);
+ pcache = card->parts[partition].pcache;
+ pcache->valid = 0;
+
+ /* prepare the cache for this block */
+ if (!pcache->buffer) {
+ pcache->buffer = kmalloc(card->blocklen, GFP_KERNEL);
+ if (!pcache->buffer) {
+ dev_err(&mdev->dev, "VMU at (%d, %d) - read fails due"
+ " to lack of memory\n", mdev->port,
+ mdev->unit);
+ error = -ENOMEM;
+ goto outB;
+ }
+ }
+
+ /*
+ * Reads may be phased - again the hardware spec
+ * supports this - though may not be any devices in
+ * the wild that implement it, but we will here
+ */
+ for (x = 0; x < card->readcnt; x++) {
+ sendbuf = cpu_to_be32(partition << 24 | x << 16 | num);
+
+ if (mdev->busy = 1) {
+ wait_event_interruptible_timeout(mdev->maple_wait,
+ (mdev->busy = 0), HZ);
+ if (mdev->busy = 1) {
+ dev_notice(&mdev->dev, "VMU at (%d, %d)"
+ " is busy\n", mdev->port, mdev->unit);
+ error = -EAGAIN;
+ goto outB;
+ }
+ }
+
+ mdev->busy = 1;
+ blockread = kmalloc(card->blocklen/card->readcnt, GFP_KERNEL);
+ if (!blockread) {
+ error = -ENOMEM;
+ mdev->busy = 0;
+ goto outB;
+ }
+ card->blockread = blockread;
+
+ maple_getcond_callback(mdev, vmu_blockread, 0,
+ MAPLE_FUNC_MEMCARD);
+ error = maple_add_packet(mdev, MAPLE_FUNC_MEMCARD,
+ MAPLE_COMMAND_BREAD, 2, &sendbuf);
+ wait = wait_event_interruptible_timeout(mdev->maple_wait,
+ ((mdev->busy = 0) || (mdev->busy = 2)), HZ/2);
+ /*
+ * MTD layer does not handle hotplugging well
+ * so have to return errors when VMU is unplugged
+ * in the middle of a read (busy = 2)
+ */
+ if (error || (mdev->busy = 2)) {
+ if (mdev->busy = 2)
+ error = -ENXIO;
+ mdev->busy = 0;
+ goto outA;
+ }
+ if ((wait = 0) || (wait = -ERESTARTSYS)) {
+ kfree(mdev->mq->sendbuf);
+ list_del_init(&(mdev->mq->list));
+ mdev->busy = 0;
+ error = -EIO;
+ if (wait = -ERESTARTSYS)
+ dev_warn(&mdev->dev, "VMU read on (%d, %d)"
+ " interrupted on block 0x%X\n",
+ mdev->port, mdev->unit, num);
+ else
+ dev_notice(&mdev->dev, "VMU read on (%d, %d)"
+ " timed out on block 0x%X\n",
+ mdev->port, mdev->unit, num);
+ goto outA;
+ }
+
+ memcpy(buf + (card->blocklen/card->readcnt) * x, blockread,
+ card->blocklen/card->readcnt);
+
+ memcpy(pcache->buffer + (card->blocklen/card->readcnt) * x,
+ card->blockread, card->blocklen/card->readcnt);
+ pcache->block = num;
+ pcache->jiffies_atc = jiffies;
+ pcache->valid = 1;
+ }
+
+outA:
+ kfree(blockread);
+outB:
+ return error;
+}
+
+/* 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, wait;
+ __be32 *sendbuf;
+
+ mpart = mtd->priv;
+ mdev = mpart->mdev;
+ partition = mpart->partition;
+ card = maple_get_drvdata(mdev);
+
+ phaselen = card->blocklen/card->writecnt;
+
+ sendbuf = kmalloc(phaselen + 4, GFP_KERNEL);
+ if (!sendbuf) {
+ error = -ENOMEM;
+ goto fail_nosendbuf;
+ }
+ for (x = 0; x < card->writecnt; x++) {
+ sendbuf[0] = cpu_to_be32(partition << 24 | x << 16 | num);
+ memcpy(&sendbuf[1], buf + phaselen * x, phaselen);
+ /* wait until the device is not busy doing something else
+ * or 1 second - which ever is longer */
+ if (mdev->busy = 1) {
+ wait_event_interruptible_timeout(mdev->maple_wait,
+ (mdev->busy = 0), HZ);
+ if (mdev->busy = 1) {
+ error = -EBUSY;
+ dev_notice(&mdev->dev, "VMU write at (%d, %d)"
+ "failed - device is busy\n",
+ mdev->port, mdev->unit);
+ goto fail_nolock;
+ }
+ }
+ mdev->busy = 1;
+
+ locking = maple_add_packet(mdev, MAPLE_FUNC_MEMCARD,
+ MAPLE_COMMAND_BWRITE, phaselen / 4 + 2, sendbuf);
+ wait = wait_event_interruptible_timeout(mdev->maple_wait,
+ (mdev->busy = 0), HZ/10);
+ if (locking) {
+ error = -EIO;
+ mdev->busy = 0;
+ goto fail_nolock;
+ }
+ if (mdev->busy = 2) {
+ mdev->busy = 0;
+ } else if ((wait = 0) || (wait = -ERESTARTSYS)) {
+ error = -EIO;
+ dev_warn(&mdev->dev, "Write at (%d, %d) of block"
+ " 0x%X at phase %d failed: could not"
+ " communicate with VMU", mdev->port,
+ mdev->unit, num, x);
+ mdev->busy = 0;
+ kfree(mdev->mq->sendbuf);
+ list_del_init(&(mdev->mq->list));
+ goto fail_nolock;
+ }
+ }
+ kfree(sendbuf);
+
+ return card->blocklen;
+
+fail_nolock:
+ kfree(sendbuf);
+fail_nosendbuf:
+ dev_err(&mdev->dev, "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 = maple_get_drvdata(mdev);
+ *retval = 0;
+
+ buf = kmalloc(card->blocklen, GFP_KERNEL);
+ if (!buf) {
+ *retval = 1;
+ ret = -ENOMEM;
+ goto finish;
+ }
+
+ vblock = ofs_to_block(ofs, mtd, partition);
+ if (!vblock) {
+ *retval = 3;
+ ret = -ENOMEM;
+ goto out_buf;
+ }
+
+ error = maple_vmu_read_block(vblock->num, buf, mtd);
+ if (error) {
+ ret = error;
+ *retval = 2;
+ goto out_vblock;
+ }
+
+ ret = buf[vblock->ofs];
+
+out_vblock:
+ kfree(vblock);
+out_buf:
+ kfree(buf);
+finish:
+ return ret;
+}
+
+/* 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;
+ int index = 0, retval, partition, leftover, numblocks;
+ unsigned char cx;
+
+ if (len < 1)
+ return -EIO;
+
+ mpart = mtd->priv;
+ mdev = mpart->mdev;
+ partition = mpart->partition;
+ card = maple_get_drvdata(mdev);
+
+ numblocks = card->parts[partition].numblocks;
+ if (from + len > numblocks * card->blocklen)
+ len = numblocks * card->blocklen - from;
+ if (len = 0)
+ return -EIO;
+ /* Have we cached this bit already? */
+ pcache = card->parts[partition].pcache;
+ do {
+ vblock = ofs_to_block(from + index, mtd, partition);
+ if (!vblock)
+ return -ENOMEM;
+ /* Have we cached this and is the cache valid and timely? */
+ if (pcache->valid &&
+ time_before(jiffies, pcache->jiffies_atc + HZ) &&
+ (pcache->block = vblock->num)) {
+ /* we have cached it, so do necessary copying */
+ leftover = card->blocklen - vblock->ofs;
+ if (vblock->ofs + len - index < card->blocklen) {
+ /* only a bit of this block to copy */
+ memcpy(buf + index,
+ pcache->buffer + vblock->ofs,
+ len - index);
+ index = len;
+ } else {
+ /* otherwise copy remainder of whole block */
+ memcpy(buf + index, pcache->buffer +
+ vblock->ofs, leftover);
+ index += leftover;
+ }
+ } else {
+ /*
+ * Not cached so read one byte -
+ * but cache the rest of the block
+ */
+ cx = vmu_flash_read_char(from + index, &retval, mtd);
+ if (retval) {
+ *retlen = index;
+ kfree(vblock);
+ return cx;
+ }
+ memset(buf + index, cx, 1);
+ index++;
+ }
+ kfree(vblock);
+ } 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 = maple_get_drvdata(mdev);
+
+ /* simple sanity checks */
+ if (len < 1) {
+ error = -EIO;
+ goto failed;
+ }
+ numblocks = card->parts[partition].numblocks;
+ if (to + len > numblocks * card->blocklen)
+ len = numblocks * card->blocklen - to;
+ if (len = 0) {
+ error = -EIO;
+ 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);
+ /* invalidate 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:
+ dev_err(&mdev->dev, "VMU write failing with error %d\n", error);
+ return error;
+}
+
+static void vmu_flash_sync(struct mtd_info *mtd)
+{
+ /* Do nothing here */
+}
+
+/* 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;
+ __be32 partnum;
+ struct vmu_cache *pcache;
+ struct mdev_part *mpart;
+ struct mtd_info *mtd_cur;
+ struct vmupart *part_cur;
+ int error;
+
+ mdev = mq->dev;
+ card = maple_get_drvdata(mdev);
+ res = (unsigned short *) (mq->recvbuf->buf);
+ card->tempA = res[12];
+ card->tempB = res[6];
+
+ dev_info(&mdev->dev, "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 = 8;
+ mtd_cur->flags = MTD_WRITEABLE|MTD_NO_ERASE;
+ 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->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 = kzalloc(sizeof(struct vmu_cache), GFP_KERNEL);
+ if (!pcache)
+ goto fail_cache_create;
+ part_cur->pcache = pcache;
+
+ error = add_mtd_device(mtd_cur);
+ if (error)
+ goto fail_mtd_register;
+
+ maple_getcond_callback(mdev, NULL, 0,
+ MAPLE_FUNC_MEMCARD);
+
+ /*
+ * Set up a recursive call to the (probably theoretical)
+ * second or more partition
+ */
+ if (++card->partition < card->partitions) {
+ partnum = cpu_to_be32(card->partition << 24);
+ maple_getcond_callback(mdev, vmu_queryblocks, 0,
+ MAPLE_FUNC_MEMCARD);
+ maple_add_packet(mdev, MAPLE_FUNC_MEMCARD,
+ MAPLE_COMMAND_GETMINFO, 2, &partnum);
+ }
+ return;
+
+fail_mtd_register:
+ dev_err(&mdev->dev, "Could not register maple device at (%d, %d)"
+ "error is 0x%X\n", mdev->port, mdev->unit, error);
+ for (error = 0; error <= card->partition; error++) {
+ kfree(((card->parts)[error]).pcache);
+ ((card->parts)[error]).pcache = NULL;
+ }
+fail_cache_create:
+fail_mpart:
+ for (error = 0; error <= card->partition; error++) {
+ kfree(((card->mtd)[error]).priv);
+ ((card->mtd)[error]).priv = NULL;
+ }
+ maple_getcond_callback(mdev, NULL, 0,
+ MAPLE_FUNC_MEMCARD);
+ kfree(part_cur->name);
+fail_name:
+ return;
+}
+
+/* Handles very basic info about the flash, queries for details */
+static int __devinit vmu_connect(struct maple_device *mdev)
+{
+ unsigned long test_flash_data, basic_flash_data;
+ int c, error;
+ struct memcard *card;
+ u32 partnum = 0;
+
+ 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;
+ }
+
+ card->mtd = kmalloc(sizeof(struct mtd_info) * card->partitions,
+ GFP_KERNEL);
+ if (!card->mtd) {
+ error = -ENOMEM;
+ goto fail_mtd_info;
+ }
+
+ maple_set_drvdata(mdev, card);
+
+ /*
+ * We want to trap meminfo not get cond
+ * so set interval to zero, but rely on maple bus
+ * driver to pass back the results of the meminfo
+ */
+ maple_getcond_callback(mdev, vmu_queryblocks, 0,
+ MAPLE_FUNC_MEMCARD);
+
+ /* Make sure we are clear to go */
+ if (mdev->busy = 1) {
+ wait_event_interruptible_timeout(mdev->maple_wait,
+ (mdev->busy = 0), HZ);
+ if (mdev->busy = 1) {
+ dev_notice(&mdev->dev, "VMU at (%d, %d) is busy\n",
+ mdev->port, mdev->unit);
+ error = -EAGAIN;
+ goto fail_device_busy;
+ }
+ }
+
+ mdev->busy = 1;
+
+ /*
+ * Set up the minfo call: vmu_queryblocks will handle
+ * the information passed back
+ */
+ error = maple_add_packet(mdev, MAPLE_FUNC_MEMCARD,
+ MAPLE_COMMAND_GETMINFO, 2, &partnum);
+ if (error) {
+ dev_err(&mdev->dev, "Could not lock VMU at (%d, %d)"
+ " error is 0x%X\n", mdev->port, mdev->unit, error);
+ goto fail_mtd_info;
+ }
+ return 0;
+
+fail_device_busy:
+ kfree(card->mtd);
+fail_mtd_info:
+ kfree(card->parts);
+fail_partitions:
+ kfree(card);
+fail_nomem:
+ return error;
+}
+
+static void __devexit vmu_disconnect(struct maple_device *mdev)
+{
+ struct memcard *card;
+ struct mdev_part *mpart;
+ int x;
+
+ mdev->callback = NULL;
+ card = maple_get_drvdata(mdev);
+ for (x = 0; x < card->partitions; x++) {
+ mpart = ((card->mtd)[x]).priv;
+ mpart->mdev = NULL;
+ del_mtd_device(&((card->mtd)[x]));
+ kfree(((card->parts)[x]).name);
+ }
+ kfree(card->parts);
+ kfree(card->mtd);
+ kfree(card);
+}
+
+/* Callback to handle eccentricities of both mtd subsystem
+ * and general flakyness of Dreamcast VMUs
+ */
+static int vmu_can_unload(struct maple_device *mdev)
+{
+ struct memcard *card;
+ int x;
+ struct mtd_info *mtd;
+
+ card = maple_get_drvdata(mdev);
+ for (x = 0; x < card->partitions; x++) {
+ mtd = &((card->mtd)[x]);
+ if (mtd->usecount > 0)
+ return 0;
+ }
+ return 1;
+}
+
+#define ERRSTR "VMU at (%d, %d) file error -"
+
+static void vmu_file_error(struct maple_device *mdev, void *recvbuf)
+{
+ enum maple_file_errors error = ((int *)recvbuf)[1];
+
+ switch (error) {
+
+ case MAPLE_FILEERR_INVALID_PARTITION:
+ dev_notice(&mdev->dev, ERRSTR " invalid partition number\n",
+ mdev->port, mdev->unit);
+ break;
+
+ case MAPLE_FILEERR_PHASE_ERROR:
+ dev_notice(&mdev->dev, ERRSTR " phase error\n",
+ mdev->port, mdev->unit);
+ break;
+
+ case MAPLE_FILEERR_INVALID_BLOCK:
+ dev_notice(&mdev->dev, ERRSTR " invalid block number\n",
+ mdev->port, mdev->unit);
+ break;
+
+ case MAPLE_FILEERR_WRITE_ERROR:
+ dev_notice(&mdev->dev, ERRSTR " write error\n",
+ mdev->port, mdev->unit);
+ break;
+
+ case MAPLE_FILEERR_INVALID_WRITE_LENGTH:
+ dev_notice(&mdev->dev, ERRSTR " invalid write length\n",
+ mdev->port, mdev->unit);
+ break;
+
+ case MAPLE_FILEERR_BAD_CRC:
+ dev_notice(&mdev->dev, ERRSTR " bad CRC\n",
+ mdev->port, mdev->unit);
+ break;
+
+ default:
+ dev_notice(&mdev->dev, ERRSTR " 0x%X\n",
+ mdev->port, mdev->unit, error);
+ }
+}
+
+
+static int __devinit 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);
+
+ mdev->can_unload = vmu_can_unload;
+ mdev->fileerr_handler = vmu_file_error;
+ mdev->driver = mdrv;
+
+ error = vmu_connect(mdev);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+static int __devexit 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,
+ .drv = {
+ .name = "Dreamcast_visual_memory",
+ .probe = probe_maple_vmu,
+ .remove = __devexit_p(remove_maple_vmu),
+ },
+};
+
+static int __init vmu_flash_map_init(void)
+{
+ return maple_driver_register(&vmu_flash_driver);
+}
+
+static void __exit vmu_flash_map_exit(void)
+{
+ maple_driver_unregister(&vmu_flash_driver);
+}
+
+module_init(vmu_flash_map_init);
+module_exit(vmu_flash_map_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Adrian McMenamin");
+MODULE_DESCRIPTION("Flash mapping for Sega Dreamcast visual memory");