add idl4k kernel firmware version 1.13.0.105

kernel/drivers/mmc/card/Kconfig

@@ -0,0 +1,52 @@
+#
+# MMC/SD card drivers
+#
+
+comment "MMC/SD/SDIO Card Drivers"
+
+config MMC_BLOCK
+	tristate "MMC block device driver"
+	depends on BLOCK
+	default y
+	help
+	  Say Y here to enable the MMC block device driver support.
+	  This provides a block device driver, which you can use to
+	  mount the filesystem. Almost everyone wishing MMC support
+	  should say Y or M here.
+
+config MMC_BLOCK_BOUNCE
+	bool "Use bounce buffer for simple hosts"
+	depends on MMC_BLOCK
+	default y
+	help
+	  SD/MMC is a high latency protocol where it is crucial to
+	  send large requests in order to get high performance. Many
+	  controllers, however, are restricted to continuous memory
+	  (i.e. they can't do scatter-gather), something the kernel
+	  rarely can provide.
+
+	  Say Y here to help these restricted hosts by bouncing
+	  requests back and forth from a large buffer. You will get
+	  a big performance gain at the cost of up to 64 KiB of
+	  physical memory.
+
+	  If unsure, say Y here.
+
+config SDIO_UART
+	tristate "SDIO UART/GPS class support"
+	help
+	  SDIO function driver for SDIO cards that implements the UART
+	  class, as well as the GPS class which appears like a UART.
+
+config MMC_TEST
+	tristate "MMC host test driver"
+	default n
+	help
+	  Development driver that performs a series of reads and writes
+	  to a memory card in order to expose certain well known bugs
+	  in host controllers. The tests are executed by writing to the
+	  "test" file in sysfs under each card. Note that whatever is
+	  on your card will be overwritten by these tests.
+
+	  This driver is only of interest to those developing or
+	  testing a host driver. Most people should say N here.

kernel/drivers/mmc/card/Makefile

@@ -0,0 +1,14 @@
+#
+# Makefile for MMC/SD card drivers
+#
+
+ifeq ($(CONFIG_MMC_DEBUG),y)
+	EXTRA_CFLAGS		+= -DDEBUG
+endif
+
+obj-$(CONFIG_MMC_BLOCK)		+= mmc_block.o
+mmc_block-objs			:= block.o queue.o
+obj-$(CONFIG_MMC_TEST)		+= mmc_test.o
+
+obj-$(CONFIG_SDIO_UART)		+= sdio_uart.o
+

kernel/drivers/mmc/card/block.c

@@ -0,0 +1,712 @@
+/*
+ * Block driver for media (i.e., flash cards)
+ *
+ * Copyright 2002 Hewlett-Packard Company
+ * Copyright 2005-2008 Pierre Ossman
+ *
+ * Use consistent with the GNU GPL is permitted,
+ * provided that this copyright notice is
+ * preserved in its entirety in all copies and derived works.
+ *
+ * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
+ * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
+ * FITNESS FOR ANY PARTICULAR PURPOSE.
+ *
+ * Many thanks to Alessandro Rubini and Jonathan Corbet!
+ *
+ * Author:  Andrew Christian
+ *          28 May 2002
+ */
+#include <linux/moduleparam.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/hdreg.h>
+#include <linux/kdev_t.h>
+#include <linux/blkdev.h>
+#include <linux/mutex.h>
+#include <linux/scatterlist.h>
+#include <linux/string_helpers.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sd.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#include "queue.h"
+
+MODULE_ALIAS("mmc:block");
+
+/*
+ * max 8 partitions per card
+ */
+#define MMC_SHIFT	3
+#define MMC_NUM_MINORS	(256 >> MMC_SHIFT)
+
+static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS);
+
+/*
+ * There is one mmc_blk_data per slot.
+ */
+struct mmc_blk_data {
+	spinlock_t	lock;
+	struct gendisk	*disk;
+	struct mmc_queue queue;
+
+	unsigned int	usage;
+	unsigned int	read_only;
+};
+
+static DEFINE_MUTEX(open_lock);
+
+static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
+{
+	struct mmc_blk_data *md;
+
+	mutex_lock(&open_lock);
+	md = disk->private_data;
+	if (md && md->usage == 0)
+		md = NULL;
+	if (md)
+		md->usage++;
+	mutex_unlock(&open_lock);
+
+	return md;
+}
+
+static void mmc_blk_put(struct mmc_blk_data *md)
+{
+	mutex_lock(&open_lock);
+	md->usage--;
+	if (md->usage == 0) {
+		int devmaj = MAJOR(disk_devt(md->disk));
+		int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT;
+
+		if (!devmaj)
+			devidx = md->disk->first_minor >> MMC_SHIFT;
+
+		blk_cleanup_queue(md->queue.queue);
+
+		__clear_bit(devidx, dev_use);
+
+		put_disk(md->disk);
+		kfree(md);
+	}
+	mutex_unlock(&open_lock);
+}
+
+static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
+{
+	struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
+	int ret = -ENXIO;
+
+	if (md) {
+		if (md->usage == 2)
+			check_disk_change(bdev);
+		ret = 0;
+
+		if ((mode & FMODE_WRITE) && md->read_only) {
+			mmc_blk_put(md);
+			ret = -EROFS;
+		}
+	}
+
+	return ret;
+}
+
+static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
+{
+	struct mmc_blk_data *md = disk->private_data;
+
+	mmc_blk_put(md);
+	return 0;
+}
+
+static int
+mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+	geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
+	geo->heads = 4;
+	geo->sectors = 16;
+	return 0;
+}
+
+static const struct block_device_operations mmc_bdops = {
+	.open			= mmc_blk_open,
+	.release		= mmc_blk_release,
+	.getgeo			= mmc_blk_getgeo,
+	.owner			= THIS_MODULE,
+};
+
+struct mmc_blk_request {
+	struct mmc_request	mrq;
+	struct mmc_command	cmd;
+	struct mmc_command	stop;
+	struct mmc_data		data;
+};
+
+static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
+{
+	int err;
+	u32 result;
+	__be32 *blocks;
+
+	struct mmc_request mrq;
+	struct mmc_command cmd;
+	struct mmc_data data;
+	unsigned int timeout_us;
+
+	struct scatterlist sg;
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+
+	cmd.opcode = MMC_APP_CMD;
+	cmd.arg = card->rca << 16;
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
+
+	err = mmc_wait_for_cmd(card->host, &cmd, 0);
+	if (err)
+		return (u32)-1;
+	if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
+		return (u32)-1;
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+
+	cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
+	cmd.arg = 0;
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+
+	memset(&data, 0, sizeof(struct mmc_data));
+
+	data.timeout_ns = card->csd.tacc_ns * 100;
+	data.timeout_clks = card->csd.tacc_clks * 100;
+
+	timeout_us = data.timeout_ns / 1000;
+	timeout_us += data.timeout_clks * 1000 /
+		(card->host->ios.clock / 1000);
+
+	if (timeout_us > 100000) {
+		data.timeout_ns = 100000000;
+		data.timeout_clks = 0;
+	}
+
+	data.blksz = 4;
+	data.blocks = 1;
+	data.flags = MMC_DATA_READ;
+	data.sg = &sg;
+	data.sg_len = 1;
+
+	memset(&mrq, 0, sizeof(struct mmc_request));
+
+	mrq.cmd = &cmd;
+	mrq.data = &data;
+
+	blocks = kmalloc(4, GFP_KERNEL);
+	if (!blocks)
+		return (u32)-1;
+
+	sg_init_one(&sg, blocks, 4);
+
+	mmc_wait_for_req(card->host, &mrq);
+
+	result = ntohl(*blocks);
+	kfree(blocks);
+
+	if (cmd.error || data.error)
+		result = (u32)-1;
+
+	return result;
+}
+
+static u32 get_card_status(struct mmc_card *card, struct request *req)
+{
+	struct mmc_command cmd;
+	int err;
+
+	memset(&cmd, 0, sizeof(struct mmc_command));
+	cmd.opcode = MMC_SEND_STATUS;
+	if (!mmc_host_is_spi(card->host))
+		cmd.arg = card->rca << 16;
+	cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
+	err = mmc_wait_for_cmd(card->host, &cmd, 0);
+	if (err)
+		printk(KERN_ERR "%s: error %d sending status comand",
+		       req->rq_disk->disk_name, err);
+	return cmd.resp[0];
+}
+
+static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
+{
+	struct mmc_blk_data *md = mq->data;
+	struct mmc_card *card = md->queue.card;
+	struct mmc_blk_request brq;
+	int ret = 1, disable_multi = 0;
+
+	mmc_claim_host(card->host);
+
+	do {
+		struct mmc_command cmd;
+		u32 readcmd, writecmd, status = 0;
+
+		memset(&brq, 0, sizeof(struct mmc_blk_request));
+		brq.mrq.cmd = &brq.cmd;
+		brq.mrq.data = &brq.data;
+
+		brq.cmd.arg = blk_rq_pos(req);
+		if (!mmc_card_blockaddr(card))
+			brq.cmd.arg <<= 9;
+		brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+		brq.data.blksz = 512;
+		brq.stop.opcode = MMC_STOP_TRANSMISSION;
+		brq.stop.arg = 0;
+		brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
+		brq.data.blocks = blk_rq_sectors(req);
+
+		/*
+		 * The block layer doesn't support all sector count
+		 * restrictions, so we need to be prepared for too big
+		 * requests.
+		 */
+		if (brq.data.blocks > card->host->max_blk_count)
+			brq.data.blocks = card->host->max_blk_count;
+
+		/*
+		 * After a read error, we redo the request one sector at a time
+		 * in order to accurately determine which sectors can be read
+		 * successfully.
+		 */
+		if (disable_multi && brq.data.blocks > 1)
+			brq.data.blocks = 1;
+
+		if (brq.data.blocks > 1) {
+			/* SPI multiblock writes terminate using a special
+			 * token, not a STOP_TRANSMISSION request.
+			 */
+			if (!mmc_host_is_spi(card->host)
+					|| rq_data_dir(req) == READ)
+				brq.mrq.stop = &brq.stop;
+			readcmd = MMC_READ_MULTIPLE_BLOCK;
+			writecmd = MMC_WRITE_MULTIPLE_BLOCK;
+		} else {
+			brq.mrq.stop = NULL;
+			readcmd = MMC_READ_SINGLE_BLOCK;
+			writecmd = MMC_WRITE_BLOCK;
+		}
+
+		if (rq_data_dir(req) == READ) {
+			brq.cmd.opcode = readcmd;
+			brq.data.flags |= MMC_DATA_READ;
+		} else {
+			brq.cmd.opcode = writecmd;
+			brq.data.flags |= MMC_DATA_WRITE;
+		}
+
+		mmc_set_data_timeout(&brq.data, card);
+
+		brq.data.sg = mq->sg;
+		brq.data.sg_len = mmc_queue_map_sg(mq);
+
+		/*
+		 * Adjust the sg list so it is the same size as the
+		 * request.
+		 */
+		if (brq.data.blocks != blk_rq_sectors(req)) {
+			int i, data_size = brq.data.blocks << 9;
+			struct scatterlist *sg;
+
+			for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
+				data_size -= sg->length;
+				if (data_size <= 0) {
+					sg->length += data_size;
+					i++;
+					break;
+				}
+			}
+			brq.data.sg_len = i;
+		}
+
+		mmc_queue_bounce_pre(mq);
+
+		mmc_wait_for_req(card->host, &brq.mrq);
+
+		mmc_queue_bounce_post(mq);
+
+		/*
+		 * Check for errors here, but don't jump to cmd_err
+		 * until later as we need to wait for the card to leave
+		 * programming mode even when things go wrong.
+		 */
+		if (brq.cmd.error || brq.data.error || brq.stop.error) {
+			if (brq.data.blocks > 1 && rq_data_dir(req) == READ) {
+				/* Redo read one sector at a time */
+				printk(KERN_WARNING "%s: retrying using single "
+				       "block read\n", req->rq_disk->disk_name);
+				disable_multi = 1;
+				continue;
+			}
+			status = get_card_status(card, req);
+		}
+
+		if (brq.cmd.error) {
+			printk(KERN_ERR "%s: error %d sending read/write "
+			       "command, response %#x, card status %#x\n",
+			       req->rq_disk->disk_name, brq.cmd.error,
+			       brq.cmd.resp[0], status);
+		}
+
+		if (brq.data.error) {
+			if (brq.data.error == -ETIMEDOUT && brq.mrq.stop)
+				/* 'Stop' response contains card status */
+				status = brq.mrq.stop->resp[0];
+			printk(KERN_ERR "%s: error %d transferring data,"
+			       " sector %u, nr %u, card status %#x\n",
+			       req->rq_disk->disk_name, brq.data.error,
+			       (unsigned)blk_rq_pos(req),
+			       (unsigned)blk_rq_sectors(req), status);
+		}
+
+		if (brq.stop.error) {
+			printk(KERN_ERR "%s: error %d sending stop command, "
+			       "response %#x, card status %#x\n",
+			       req->rq_disk->disk_name, brq.stop.error,
+			       brq.stop.resp[0], status);
+		}
+
+		if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
+			do {
+				int err;
+
+				cmd.opcode = MMC_SEND_STATUS;
+				cmd.arg = card->rca << 16;
+				cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+				err = mmc_wait_for_cmd(card->host, &cmd, 5);
+				if (err) {
+					printk(KERN_ERR "%s: error %d requesting status\n",
+					       req->rq_disk->disk_name, err);
+					goto cmd_err;
+				}
+				/*
+				 * Some cards mishandle the status bits,
+				 * so make sure to check both the busy
+				 * indication and the card state.
+				 */
+			} while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
+				(R1_CURRENT_STATE(cmd.resp[0]) == 7));
+
+#if 0
+			if (cmd.resp[0] & ~0x00000900)
+				printk(KERN_ERR "%s: status = %08x\n",
+				       req->rq_disk->disk_name, cmd.resp[0]);
+			if (mmc_decode_status(cmd.resp))
+				goto cmd_err;
+#endif
+		}
+
+		if (brq.cmd.error || brq.stop.error || brq.data.error) {
+			if (rq_data_dir(req) == READ) {
+				/*
+				 * After an error, we redo I/O one sector at a
+				 * time, so we only reach here after trying to
+				 * read a single sector.
+				 */
+				spin_lock_irq(&md->lock);
+				ret = __blk_end_request(req, -EIO, brq.data.blksz);
+				spin_unlock_irq(&md->lock);
+				continue;
+			}
+			goto cmd_err;
+		}
+
+		/*
+		 * A block was successfully transferred.
+		 */
+		spin_lock_irq(&md->lock);
+		ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
+		spin_unlock_irq(&md->lock);
+	} while (ret);
+
+	mmc_release_host(card->host);
+
+	return 1;
+
+ cmd_err:
+ 	/*
+ 	 * If this is an SD card and we're writing, we can first
+ 	 * mark the known good sectors as ok.
+ 	 *
+	 * If the card is not SD, we can still ok written sectors
+	 * as reported by the controller (which might be less than
+	 * the real number of written sectors, but never more).
+	 */
+	if (mmc_card_sd(card)) {
+		u32 blocks;
+
+		blocks = mmc_sd_num_wr_blocks(card);
+		if (blocks != (u32)-1) {
+			spin_lock_irq(&md->lock);
+			ret = __blk_end_request(req, 0, blocks << 9);
+			spin_unlock_irq(&md->lock);
+		}
+	} else {
+		spin_lock_irq(&md->lock);
+		ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
+		spin_unlock_irq(&md->lock);
+	}
+
+	mmc_release_host(card->host);
+
+	spin_lock_irq(&md->lock);
+	while (ret)
+		ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
+	spin_unlock_irq(&md->lock);
+
+	return 0;
+}
+
+
+static inline int mmc_blk_readonly(struct mmc_card *card)
+{
+	return mmc_card_readonly(card) ||
+	       !(card->csd.cmdclass & CCC_BLOCK_WRITE);
+}
+
+static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
+{
+	struct mmc_blk_data *md;
+	int devidx, ret;
+
+	devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
+	if (devidx >= MMC_NUM_MINORS)
+		return ERR_PTR(-ENOSPC);
+	__set_bit(devidx, dev_use);
+
+	md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
+	if (!md) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+
+	/*
+	 * Set the read-only status based on the supported commands
+	 * and the write protect switch.
+	 */
+	md->read_only = mmc_blk_readonly(card);
+
+	md->disk = alloc_disk(1 << MMC_SHIFT);
+	if (md->disk == NULL) {
+		ret = -ENOMEM;
+		goto err_kfree;
+	}
+
+	spin_lock_init(&md->lock);
+	md->usage = 1;
+
+	ret = mmc_init_queue(&md->queue, card, &md->lock);
+	if (ret)
+		goto err_putdisk;
+
+	md->queue.issue_fn = mmc_blk_issue_rq;
+	md->queue.data = md;
+
+	md->disk->major	= MMC_BLOCK_MAJOR;
+	md->disk->first_minor = devidx << MMC_SHIFT;
+	md->disk->fops = &mmc_bdops;
+	md->disk->private_data = md;
+	md->disk->queue = md->queue.queue;
+	md->disk->driverfs_dev = &card->dev;
+
+	/*
+	 * As discussed on lkml, GENHD_FL_REMOVABLE should:
+	 *
+	 * - be set for removable media with permanent block devices
+	 * - be unset for removable block devices with permanent media
+	 *
+	 * Since MMC block devices clearly fall under the second
+	 * case, we do not set GENHD_FL_REMOVABLE.  Userspace
+	 * should use the block device creation/destruction hotplug
+	 * messages to tell when the card is present.
+	 */
+
+	sprintf(md->disk->disk_name, "mmcblk%d", devidx);
+
+	blk_queue_logical_block_size(md->queue.queue, 512);
+
+	if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
+		/*
+		 * The EXT_CSD sector count is in number or 512 byte
+		 * sectors.
+		 */
+		set_capacity(md->disk, card->ext_csd.sectors);
+	} else {
+		/*
+		 * The CSD capacity field is in units of read_blkbits.
+		 * set_capacity takes units of 512 bytes.
+		 */
+		set_capacity(md->disk,
+			card->csd.capacity << (card->csd.read_blkbits - 9));
+	}
+	return md;
+
+ err_putdisk:
+	put_disk(md->disk);
+ err_kfree:
+	kfree(md);
+ out:
+	return ERR_PTR(ret);
+}
+
+static int
+mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
+{
+	struct mmc_command cmd;
+	int err;
+
+	/* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
+	if (mmc_card_blockaddr(card))
+		return 0;
+
+	mmc_claim_host(card->host);
+	cmd.opcode = MMC_SET_BLOCKLEN;
+	cmd.arg = 512;
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
+	err = mmc_wait_for_cmd(card->host, &cmd, 5);
+	mmc_release_host(card->host);
+
+	if (err) {
+		printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
+			md->disk->disk_name, cmd.arg, err);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int mmc_blk_probe(struct mmc_card *card)
+{
+	struct mmc_blk_data *md;
+	int err;
+
+	char cap_str[10];
+
+	/*
+	 * Check that the card supports the command class(es) we need.
+	 */
+	if (!(card->csd.cmdclass & CCC_BLOCK_READ))
+		return -ENODEV;
+
+	md = mmc_blk_alloc(card);
+	if (IS_ERR(md))
+		return PTR_ERR(md);
+
+	err = mmc_blk_set_blksize(md, card);
+	if (err)
+		goto out;
+
+	string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
+			cap_str, sizeof(cap_str));
+	printk(KERN_INFO "%s: %s %s %s %s\n",
+		md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
+		cap_str, md->read_only ? "(ro)" : "");
+
+	mmc_set_drvdata(card, md);
+	add_disk(md->disk);
+	return 0;
+
+ out:
+	mmc_cleanup_queue(&md->queue);
+	mmc_blk_put(md);
+
+	return err;
+}
+
+static void mmc_blk_remove(struct mmc_card *card)
+{
+	struct mmc_blk_data *md = mmc_get_drvdata(card);
+
+	if (md) {
+		/* Stop new requests from getting into the queue */
+		del_gendisk(md->disk);
+
+		/* Then flush out any already in there */
+		mmc_cleanup_queue(&md->queue);
+
+		mmc_blk_put(md);
+	}
+	mmc_set_drvdata(card, NULL);
+}
+
+#ifdef CONFIG_PM
+static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
+{
+	struct mmc_blk_data *md = mmc_get_drvdata(card);
+
+	if (md) {
+		mmc_queue_suspend(&md->queue);
+	}
+	return 0;
+}
+
+static int mmc_blk_resume(struct mmc_card *card)
+{
+	struct mmc_blk_data *md = mmc_get_drvdata(card);
+
+	if (md) {
+		mmc_blk_set_blksize(md, card);
+		mmc_queue_resume(&md->queue);
+	}
+	return 0;
+}
+#else
+#define	mmc_blk_suspend	NULL
+#define mmc_blk_resume	NULL
+#endif
+
+static struct mmc_driver mmc_driver = {
+	.drv		= {
+		.name	= "mmcblk",
+	},
+	.probe		= mmc_blk_probe,
+	.remove		= mmc_blk_remove,
+	.suspend	= mmc_blk_suspend,
+	.resume		= mmc_blk_resume,
+};
+
+static int __init mmc_blk_init(void)
+{
+	int res;
+
+	res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
+	if (res)
+		goto out;
+
+	res = mmc_register_driver(&mmc_driver);
+	if (res)
+		goto out2;
+
+	return 0;
+ out2:
+	unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
+ out:
+	return res;
+}
+
+static void __exit mmc_blk_exit(void)
+{
+	mmc_unregister_driver(&mmc_driver);
+	unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
+}
+
+module_init(mmc_blk_init);
+module_exit(mmc_blk_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
+

kernel/drivers/mmc/card/queue.c

@@ -0,0 +1,364 @@
+/*
+ *  linux/drivers/mmc/card/queue.c
+ *
+ *  Copyright (C) 2003 Russell King, All Rights Reserved.
+ *  Copyright 2006-2007 Pierre Ossman
+ *
+ * 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.
+ *
+ */
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/freezer.h>
+#include <linux/kthread.h>
+#include <linux/scatterlist.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+#include "queue.h"
+
+#define MMC_QUEUE_BOUNCESZ	65536
+
+#define MMC_QUEUE_SUSPENDED	(1 << 0)
+
+/*
+ * Prepare a MMC request. This just filters out odd stuff.
+ */
+static int mmc_prep_request(struct request_queue *q, struct request *req)
+{
+	/*
+	 * We only like normal block requests.
+	 */
+	if (!blk_fs_request(req)) {
+		blk_dump_rq_flags(req, "MMC bad request");
+		return BLKPREP_KILL;
+	}
+
+	req->cmd_flags |= REQ_DONTPREP;
+
+	return BLKPREP_OK;
+}
+
+static int mmc_queue_thread(void *d)
+{
+	struct mmc_queue *mq = d;
+	struct request_queue *q = mq->queue;
+
+	current->flags |= PF_MEMALLOC;
+
+	down(&mq->thread_sem);
+	do {
+		struct request *req = NULL;
+
+		spin_lock_irq(q->queue_lock);
+		set_current_state(TASK_INTERRUPTIBLE);
+		if (!blk_queue_plugged(q))
+			req = blk_fetch_request(q);
+		mq->req = req;
+		spin_unlock_irq(q->queue_lock);
+
+		if (!req) {
+			if (kthread_should_stop()) {
+				set_current_state(TASK_RUNNING);
+				break;
+			}
+			up(&mq->thread_sem);
+			schedule();
+			down(&mq->thread_sem);
+			continue;
+		}
+		set_current_state(TASK_RUNNING);
+
+		mq->issue_fn(mq, req);
+	} while (1);
+	up(&mq->thread_sem);
+
+	return 0;
+}
+
+/*
+ * Generic MMC request handler.  This is called for any queue on a
+ * particular host.  When the host is not busy, we look for a request
+ * on any queue on this host, and attempt to issue it.  This may
+ * not be the queue we were asked to process.
+ */
+static void mmc_request(struct request_queue *q)
+{
+	struct mmc_queue *mq = q->queuedata;
+	struct request *req;
+
+	if (!mq) {
+		while ((req = blk_fetch_request(q)) != NULL) {
+			req->cmd_flags |= REQ_QUIET;
+			__blk_end_request_all(req, -EIO);
+		}
+		return;
+	}
+
+	if (!mq->req)
+		wake_up_process(mq->thread);
+}
+
+/**
+ * mmc_init_queue - initialise a queue structure.
+ * @mq: mmc queue
+ * @card: mmc card to attach this queue
+ * @lock: queue lock
+ *
+ * Initialise a MMC card request queue.
+ */
+int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, spinlock_t *lock)
+{
+	struct mmc_host *host = card->host;
+	u64 limit = BLK_BOUNCE_HIGH;
+	int ret;
+
+	if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
+		limit = *mmc_dev(host)->dma_mask;
+
+	mq->card = card;
+	mq->queue = blk_init_queue(mmc_request, lock);
+	if (!mq->queue)
+		return -ENOMEM;
+
+	mq->queue->queuedata = mq;
+	mq->req = NULL;
+
+	blk_queue_prep_rq(mq->queue, mmc_prep_request);
+	blk_queue_ordered(mq->queue, QUEUE_ORDERED_DRAIN, NULL);
+	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
+
+#ifdef CONFIG_MMC_BLOCK_BOUNCE
+	if (host->max_hw_segs == 1) {
+		unsigned int bouncesz;
+
+		bouncesz = MMC_QUEUE_BOUNCESZ;
+
+		if (bouncesz > host->max_req_size)
+			bouncesz = host->max_req_size;
+		if (bouncesz > host->max_seg_size)
+			bouncesz = host->max_seg_size;
+		if (bouncesz > (host->max_blk_count * 512))
+			bouncesz = host->max_blk_count * 512;
+
+		if (bouncesz > 512) {
+			mq->bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
+			if (!mq->bounce_buf) {
+				printk(KERN_WARNING "%s: unable to "
+					"allocate bounce buffer\n",
+					mmc_card_name(card));
+			}
+		}
+
+		if (mq->bounce_buf) {
+			blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
+			blk_queue_max_sectors(mq->queue, bouncesz / 512);
+			blk_queue_max_hw_segments(mq->queue, bouncesz / 512);
+			blk_queue_max_segment_size(mq->queue, bouncesz);
+
+			mq->sg = kmalloc(sizeof(struct scatterlist),
+				GFP_KERNEL);
+			if (!mq->sg) {
+				ret = -ENOMEM;
+				goto cleanup_queue;
+			}
+			sg_init_table(mq->sg, 1);
+
+			mq->bounce_sg = kmalloc(sizeof(struct scatterlist) *
+				bouncesz / 512, GFP_KERNEL);
+			if (!mq->bounce_sg) {
+				ret = -ENOMEM;
+				goto cleanup_queue;
+			}
+			sg_init_table(mq->bounce_sg, bouncesz / 512);
+		}
+	}
+#endif
+
+	if (!mq->bounce_buf) {
+		blk_queue_bounce_limit(mq->queue, limit);
+		blk_queue_max_sectors(mq->queue,
+			min(host->max_blk_count, host->max_req_size / 512));
+		blk_queue_max_hw_segments(mq->queue, host->max_hw_segs);
+		blk_queue_max_segment_size(mq->queue, host->max_seg_size);
+
+		mq->sg = kmalloc(sizeof(struct scatterlist) *
+			host->max_phys_segs, GFP_KERNEL);
+		if (!mq->sg) {
+			ret = -ENOMEM;
+			goto cleanup_queue;
+		}
+		sg_init_table(mq->sg, host->max_phys_segs);
+	}
+
+	init_MUTEX(&mq->thread_sem);
+
+	mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd");
+	if (IS_ERR(mq->thread)) {
+		ret = PTR_ERR(mq->thread);
+		goto free_bounce_sg;
+	}
+
+	return 0;
+ free_bounce_sg:
+ 	if (mq->bounce_sg)
+ 		kfree(mq->bounce_sg);
+ 	mq->bounce_sg = NULL;
+ cleanup_queue:
+ 	if (mq->sg)
+		kfree(mq->sg);
+	mq->sg = NULL;
+	if (mq->bounce_buf)
+		kfree(mq->bounce_buf);
+	mq->bounce_buf = NULL;
+	blk_cleanup_queue(mq->queue);
+	return ret;
+}
+
+void mmc_cleanup_queue(struct mmc_queue *mq)
+{
+	struct request_queue *q = mq->queue;
+	unsigned long flags;
+
+	/* Make sure the queue isn't suspended, as that will deadlock */
+	mmc_queue_resume(mq);
+
+	/* Then terminate our worker thread */
+	kthread_stop(mq->thread);
+
+	/* Empty the queue */
+	spin_lock_irqsave(q->queue_lock, flags);
+	q->queuedata = NULL;
+	blk_start_queue(q);
+	spin_unlock_irqrestore(q->queue_lock, flags);
+
+ 	if (mq->bounce_sg)
+ 		kfree(mq->bounce_sg);
+ 	mq->bounce_sg = NULL;
+
+	kfree(mq->sg);
+	mq->sg = NULL;
+
+	if (mq->bounce_buf)
+		kfree(mq->bounce_buf);
+	mq->bounce_buf = NULL;
+
+	mq->card = NULL;
+}
+EXPORT_SYMBOL(mmc_cleanup_queue);
+
+/**
+ * mmc_queue_suspend - suspend a MMC request queue
+ * @mq: MMC queue to suspend
+ *
+ * Stop the block request queue, and wait for our thread to
+ * complete any outstanding requests.  This ensures that we
+ * won't suspend while a request is being processed.
+ */
+void mmc_queue_suspend(struct mmc_queue *mq)
+{
+	struct request_queue *q = mq->queue;
+	unsigned long flags;
+
+	if (!(mq->flags & MMC_QUEUE_SUSPENDED)) {
+		mq->flags |= MMC_QUEUE_SUSPENDED;
+
+		spin_lock_irqsave(q->queue_lock, flags);
+		blk_stop_queue(q);
+		spin_unlock_irqrestore(q->queue_lock, flags);
+
+		down(&mq->thread_sem);
+	}
+}
+
+/**
+ * mmc_queue_resume - resume a previously suspended MMC request queue
+ * @mq: MMC queue to resume
+ */
+void mmc_queue_resume(struct mmc_queue *mq)
+{
+	struct request_queue *q = mq->queue;
+	unsigned long flags;
+
+	if (mq->flags & MMC_QUEUE_SUSPENDED) {
+		mq->flags &= ~MMC_QUEUE_SUSPENDED;
+
+		up(&mq->thread_sem);
+
+		spin_lock_irqsave(q->queue_lock, flags);
+		blk_start_queue(q);
+		spin_unlock_irqrestore(q->queue_lock, flags);
+	}
+}
+
+/*
+ * Prepare the sg list(s) to be handed of to the host driver
+ */
+unsigned int mmc_queue_map_sg(struct mmc_queue *mq)
+{
+	unsigned int sg_len;
+	size_t buflen;
+	struct scatterlist *sg;
+	int i;
+
+	if (!mq->bounce_buf)
+		return blk_rq_map_sg(mq->queue, mq->req, mq->sg);
+
+	BUG_ON(!mq->bounce_sg);
+
+	sg_len = blk_rq_map_sg(mq->queue, mq->req, mq->bounce_sg);
+
+	mq->bounce_sg_len = sg_len;
+
+	buflen = 0;
+	for_each_sg(mq->bounce_sg, sg, sg_len, i)
+		buflen += sg->length;
+
+	sg_init_one(mq->sg, mq->bounce_buf, buflen);
+
+	return 1;
+}
+
+/*
+ * If writing, bounce the data to the buffer before the request
+ * is sent to the host driver
+ */
+void mmc_queue_bounce_pre(struct mmc_queue *mq)
+{
+	unsigned long flags;
+
+	if (!mq->bounce_buf)
+		return;
+
+	if (rq_data_dir(mq->req) != WRITE)
+		return;
+
+	local_irq_save(flags);
+	sg_copy_to_buffer(mq->bounce_sg, mq->bounce_sg_len,
+		mq->bounce_buf, mq->sg[0].length);
+	local_irq_restore(flags);
+}
+
+/*
+ * If reading, bounce the data from the buffer after the request
+ * has been handled by the host driver
+ */
+void mmc_queue_bounce_post(struct mmc_queue *mq)
+{
+	unsigned long flags;
+
+	if (!mq->bounce_buf)
+		return;
+
+	if (rq_data_dir(mq->req) != READ)
+		return;
+
+	local_irq_save(flags);
+	sg_copy_from_buffer(mq->bounce_sg, mq->bounce_sg_len,
+		mq->bounce_buf, mq->sg[0].length);
+	local_irq_restore(flags);
+}
+

kernel/drivers/mmc/card/queue.h

@@ -0,0 +1,31 @@
+#ifndef MMC_QUEUE_H
+#define MMC_QUEUE_H
+
+struct request;
+struct task_struct;
+
+struct mmc_queue {
+	struct mmc_card		*card;
+	struct task_struct	*thread;
+	struct semaphore	thread_sem;
+	unsigned int		flags;
+	struct request		*req;
+	int			(*issue_fn)(struct mmc_queue *, struct request *);
+	void			*data;
+	struct request_queue	*queue;
+	struct scatterlist	*sg;
+	char			*bounce_buf;
+	struct scatterlist	*bounce_sg;
+	unsigned int		bounce_sg_len;
+};
+
+extern int mmc_init_queue(struct mmc_queue *, struct mmc_card *, spinlock_t *);
+extern void mmc_cleanup_queue(struct mmc_queue *);
+extern void mmc_queue_suspend(struct mmc_queue *);
+extern void mmc_queue_resume(struct mmc_queue *);
+
+extern unsigned int mmc_queue_map_sg(struct mmc_queue *);
+extern void mmc_queue_bounce_pre(struct mmc_queue *);
+extern void mmc_queue_bounce_post(struct mmc_queue *);
+
+#endif