From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: 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! --- drivers/mmc/mmc_block.c | 509 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 509 insertions(+) create mode 100644 drivers/mmc/mmc_block.c (limited to 'drivers/mmc/mmc_block.c') diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c new file mode 100644 index 0000000..b5b4a7b1 --- /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 +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include + +#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"); -- cgit v1.1