1 files changed, 509 insertions, 0 deletions

diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
new file mode 100644
index 0000000..b5b4a7b
--- /dev/null
+++ b/drivers/mmc/mmc_block.c
@@ -0,0 +1,509 @@
+/*
+ * Block driver for media (i.e., flash cards)
+ *
+ * Copyright 2002 Hewlett-Packard Company
+ *
+ * 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/sched.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/hdreg.h>
+#include <linux/kdev_t.h>
+#include <linux/blkdev.h>
+#include <linux/devfs_fs_kernel.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/protocol.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#include "mmc_queue.h"
+
+/*
+ * max 8 partitions per card
+ */
+#define MMC_SHIFT	3
+
+static int major;
+
+/*
+ * 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	block_bits;
+};
+
+static DECLARE_MUTEX(open_lock);
+
+static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
+{
+	struct mmc_blk_data *md;
+
+	down(&open_lock);
+	md = disk->private_data;
+	if (md && md->usage == 0)
+		md = NULL;
+	if (md)
+		md->usage++;
+	up(&open_lock);
+
+	return md;
+}
+
+static void mmc_blk_put(struct mmc_blk_data *md)
+{
+	down(&open_lock);
+	md->usage--;
+	if (md->usage == 0) {
+		put_disk(md->disk);
+		mmc_cleanup_queue(&md->queue);
+		kfree(md);
+	}
+	up(&open_lock);
+}
+
+static int mmc_blk_open(struct inode *inode, struct file *filp)
+{
+	struct mmc_blk_data *md;
+	int ret = -ENXIO;
+
+	md = mmc_blk_get(inode->i_bdev->bd_disk);
+	if (md) {
+		if (md->usage == 2)
+			check_disk_change(inode->i_bdev);
+		ret = 0;
+	}
+
+	return ret;
+}
+
+static int mmc_blk_release(struct inode *inode, struct file *filp)
+{
+	struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data;
+
+	mmc_blk_put(md);
+	return 0;
+}
+
+static int
+mmc_blk_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	struct block_device *bdev = inode->i_bdev;
+
+	if (cmd == HDIO_GETGEO) {
+		struct hd_geometry geo;
+
+		memset(&geo, 0, sizeof(struct hd_geometry));
+
+		geo.cylinders	= get_capacity(bdev->bd_disk) / (4 * 16);
+		geo.heads	= 4;
+		geo.sectors	= 16;
+		geo.start	= get_start_sect(bdev);
+
+		return copy_to_user((void __user *)arg, &geo, sizeof(geo))
+			? -EFAULT : 0;
+	}
+
+	return -ENOTTY;
+}
+
+static struct block_device_operations mmc_bdops = {
+	.open			= mmc_blk_open,
+	.release		= mmc_blk_release,
+	.ioctl			= mmc_blk_ioctl,
+	.owner			= THIS_MODULE,
+};
+
+struct mmc_blk_request {
+	struct mmc_request	mrq;
+	struct mmc_command	cmd;
+	struct mmc_command	stop;
+	struct mmc_data		data;
+};
+
+static int mmc_blk_prep_rq(struct mmc_queue *mq, struct request *req)
+{
+	struct mmc_blk_data *md = mq->data;
+	int stat = BLKPREP_OK;
+
+	/*
+	 * If we have no device, we haven't finished initialising.
+	 */
+	if (!md || !mq->card) {
+		printk(KERN_ERR "%s: killing request - no device/host\n",
+		       req->rq_disk->disk_name);
+		stat = BLKPREP_KILL;
+	}
+
+	return stat;
+}
+
+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;
+	int ret;
+
+	if (mmc_card_claim_host(card))
+		goto cmd_err;
+
+	do {
+		struct mmc_blk_request brq;
+		struct mmc_command cmd;
+
+		memset(&brq, 0, sizeof(struct mmc_blk_request));
+		brq.mrq.cmd = &brq.cmd;
+		brq.mrq.data = &brq.data;
+
+		brq.cmd.arg = req->sector << 9;
+		brq.cmd.flags = MMC_RSP_R1;
+		brq.data.timeout_ns = card->csd.tacc_ns * 10;
+		brq.data.timeout_clks = card->csd.tacc_clks * 10;
+		brq.data.blksz_bits = md->block_bits;
+		brq.data.blocks = req->nr_sectors >> (md->block_bits - 9);
+		brq.stop.opcode = MMC_STOP_TRANSMISSION;
+		brq.stop.arg = 0;
+		brq.stop.flags = MMC_RSP_R1B;
+
+		if (rq_data_dir(req) == READ) {
+			brq.cmd.opcode = brq.data.blocks > 1 ? MMC_READ_MULTIPLE_BLOCK : MMC_READ_SINGLE_BLOCK;
+			brq.data.flags |= MMC_DATA_READ;
+		} else {
+			brq.cmd.opcode = MMC_WRITE_BLOCK;
+			brq.cmd.flags = MMC_RSP_R1B;
+			brq.data.flags |= MMC_DATA_WRITE;
+			brq.data.blocks = 1;
+		}
+		brq.mrq.stop = brq.data.blocks > 1 ? &brq.stop : NULL;
+
+		brq.data.sg = mq->sg;
+		brq.data.sg_len = blk_rq_map_sg(req->q, req, brq.data.sg);
+
+		mmc_wait_for_req(card->host, &brq.mrq);
+		if (brq.cmd.error) {
+			printk(KERN_ERR "%s: error %d sending read/write command\n",
+			       req->rq_disk->disk_name, brq.cmd.error);
+			goto cmd_err;
+		}
+
+		if (brq.data.error) {
+			printk(KERN_ERR "%s: error %d transferring data\n",
+			       req->rq_disk->disk_name, brq.data.error);
+			goto cmd_err;
+		}
+
+		if (brq.stop.error) {
+			printk(KERN_ERR "%s: error %d sending stop command\n",
+			       req->rq_disk->disk_name, brq.stop.error);
+			goto cmd_err;
+		}
+
+		do {
+			int err;
+
+			cmd.opcode = MMC_SEND_STATUS;
+			cmd.arg = card->rca << 16;
+			cmd.flags = MMC_RSP_R1;
+			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;
+			}
+		} while (!(cmd.resp[0] & R1_READY_FOR_DATA));
+
+#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
+
+		/*
+		 * A block was successfully transferred.
+		 */
+		spin_lock_irq(&md->lock);
+		ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
+		if (!ret) {
+			/*
+			 * The whole request completed successfully.
+			 */
+			add_disk_randomness(req->rq_disk);
+			blkdev_dequeue_request(req);
+			end_that_request_last(req);
+		}
+		spin_unlock_irq(&md->lock);
+	} while (ret);
+
+	mmc_card_release_host(card);
+
+	return 1;
+
+ cmd_err:
+	mmc_card_release_host(card);
+
+	/*
+	 * This is a little draconian, but until we get proper
+	 * error handling sorted out here, its the best we can
+	 * do - especially as some hosts have no idea how much
+	 * data was transferred before the error occurred.
+	 */
+	spin_lock_irq(&md->lock);
+	do {
+		ret = end_that_request_chunk(req, 0,
+				req->current_nr_sectors << 9);
+	} while (ret);
+
+	add_disk_randomness(req->rq_disk);
+	blkdev_dequeue_request(req);
+	end_that_request_last(req);
+	spin_unlock_irq(&md->lock);
+
+	return 0;
+}
+
+#define MMC_NUM_MINORS	(256 >> MMC_SHIFT)
+
+static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))];
+
+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 = kmalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
+	if (md) {
+		memset(md, 0, sizeof(struct mmc_blk_data));
+
+		md->disk = alloc_disk(1 << MMC_SHIFT);
+		if (md->disk == NULL) {
+			kfree(md);
+			md = ERR_PTR(-ENOMEM);
+			goto out;
+		}
+
+		spin_lock_init(&md->lock);
+		md->usage = 1;
+
+		ret = mmc_init_queue(&md->queue, card, &md->lock);
+		if (ret) {
+			put_disk(md->disk);
+			kfree(md);
+			md = ERR_PTR(ret);
+			goto out;
+		}
+		md->queue.prep_fn = mmc_blk_prep_rq;
+		md->queue.issue_fn = mmc_blk_issue_rq;
+		md->queue.data = md;
+
+		md->disk->major	= 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);
+		sprintf(md->disk->devfs_name, "mmc/blk%d", devidx);
+
+		md->block_bits = card->csd.read_blkbits;
+
+		blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);
+		set_capacity(md->disk, card->csd.capacity);
+	}
+ out:
+	return md;
+}
+
+static int
+mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
+{
+	struct mmc_command cmd;
+	int err;
+
+	mmc_card_claim_host(card);
+	cmd.opcode = MMC_SET_BLOCKLEN;
+	cmd.arg = 1 << card->csd.read_blkbits;
+	cmd.flags = MMC_RSP_R1;
+	err = mmc_wait_for_cmd(card->host, &cmd, 5);
+	mmc_card_release_host(card);
+
+	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;
+
+	if (card->csd.cmdclass & ~0x1ff)
+		return -ENODEV;
+
+	if (card->csd.read_blkbits < 9) {
+		printk(KERN_WARNING "%s: read blocksize too small (%u)\n",
+			mmc_card_id(card), 1 << card->csd.read_blkbits);
+		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;
+
+	printk(KERN_INFO "%s: %s %s %dKiB\n",
+		md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
+		(card->csd.capacity << card->csd.read_blkbits) / 1024);
+
+	mmc_set_drvdata(card, md);
+	add_disk(md->disk);
+	return 0;
+
+ out:
+	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) {
+		int devidx;
+
+		del_gendisk(md->disk);
+
+		/*
+		 * I think this is needed.
+		 */
+		md->disk->queue = NULL;
+
+		devidx = md->disk->first_minor >> MMC_SHIFT;
+		__clear_bit(devidx, dev_use);
+
+		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 = -ENOMEM;
+
+	res = register_blkdev(major, "mmc");
+	if (res < 0) {
+		printk(KERN_WARNING "Unable to get major %d for MMC media: %d\n",
+		       major, res);
+		goto out;
+	}
+	if (major == 0)
+		major = res;
+
+	devfs_mk_dir("mmc");
+	return mmc_register_driver(&mmc_driver);
+
+ out:
+	return res;
+}
+
+static void __exit mmc_blk_exit(void)
+{
+	mmc_unregister_driver(&mmc_driver);
+	devfs_remove("mmc");
+	unregister_blkdev(major, "mmc");
+}
+
+module_init(mmc_blk_init);
+module_exit(mmc_blk_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
+
+module_param(major, int, 0444);
+MODULE_PARM_DESC(major, "specify the major device number for MMC block driver");