Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
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");