X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fmmc%2Fmmc_block.c;h=587458b370b9a9d71c817d0375d140847f01c505;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=d4eee99c2bf65ffe86798deb86cdd5ef0a2e81da;hpb=cee37fe97739d85991964371c1f3a745c00dd236;p=linux-2.6.git diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c index d4eee99c2..587458b37 100644 --- a/drivers/mmc/mmc_block.c +++ b/drivers/mmc/mmc_block.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include @@ -54,35 +55,36 @@ struct mmc_blk_data { unsigned int usage; unsigned int block_bits; + unsigned int read_only; }; -static DECLARE_MUTEX(open_lock); +static DEFINE_MUTEX(open_lock); static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) { struct mmc_blk_data *md; - down(&open_lock); + mutex_lock(&open_lock); md = disk->private_data; if (md && md->usage == 0) md = NULL; if (md) md->usage++; - up(&open_lock); + mutex_unlock(&open_lock); return md; } static void mmc_blk_put(struct mmc_blk_data *md) { - down(&open_lock); + mutex_lock(&open_lock); md->usage--; if (md->usage == 0) { put_disk(md->disk); mmc_cleanup_queue(&md->queue); kfree(md); } - up(&open_lock); + mutex_unlock(&open_lock); } static int mmc_blk_open(struct inode *inode, struct file *filp) @@ -95,6 +97,9 @@ static int mmc_blk_open(struct inode *inode, struct file *filp) if (md->usage == 2) check_disk_change(inode->i_bdev); ret = 0; + + if ((filp->f_mode & FMODE_WRITE) && md->read_only) + ret = -EROFS; } return ret; @@ -109,31 +114,18 @@ static int mmc_blk_release(struct inode *inode, struct file *filp) } static int -mmc_blk_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) +mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) { - 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; + geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16); + geo->heads = 4; + geo->sectors = 16; + return 0; } static struct block_device_operations mmc_bdops = { .open = mmc_blk_open, .release = mmc_blk_release, - .ioctl = mmc_blk_ioctl, + .getgeo = mmc_blk_getgeo, .owner = THIS_MODULE, }; @@ -179,25 +171,37 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) brq.mrq.data = &brq.data; brq.cmd.arg = req->sector << 9; - brq.cmd.flags = MMC_RSP_R1; + brq.cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; 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.blksz = 1 << 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; + brq.stop.flags = MMC_RSP_R1B | MMC_CMD_AC; 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; + + /* + * Scale up the timeout by the r2w factor + */ + brq.data.timeout_ns <<= card->csd.r2w_factor; + brq.data.timeout_clks <<= card->csd.r2w_factor; + } + + if (brq.data.blocks > 1) { + brq.data.flags |= MMC_DATA_MULTI; + brq.mrq.stop = &brq.stop; + } else { + brq.mrq.stop = NULL; } - 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); @@ -226,7 +230,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) cmd.opcode = MMC_SEND_STATUS; cmd.arg = card->rca << 16; - cmd.flags = MMC_RSP_R1; + 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", @@ -254,7 +258,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) */ add_disk_randomness(req->rq_disk); blkdev_dequeue_request(req); - end_that_request_last(req); + end_that_request_last(req, 1); } spin_unlock_irq(&md->lock); } while (ret); @@ -280,7 +284,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) add_disk_randomness(req->rq_disk); blkdev_dequeue_request(req); - end_that_request_last(req); + end_that_request_last(req, 0); spin_unlock_irq(&md->lock); return 0; @@ -290,6 +294,12 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))]; +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; @@ -301,59 +311,121 @@ static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) __set_bit(devidx, dev_use); md = kmalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); - if (md) { - memset(md, 0, sizeof(struct mmc_blk_data)); + if (!md) { + ret = -ENOMEM; + goto out; + } - md->disk = alloc_disk(1 << MMC_SHIFT); - if (md->disk == NULL) { - kfree(md); - md = ERR_PTR(-ENOMEM); - goto out; - } + memset(md, 0, sizeof(struct mmc_blk_data)); - spin_lock_init(&md->lock); - md->usage = 1; + /* + * Set the read-only status based on the supported commands + * and the write protect switch. + */ + md->read_only = mmc_blk_readonly(card); - ret = mmc_init_queue(&md->queue, card, &md->lock); - if (ret) { - put_disk(md->disk); - kfree(md); - md = ERR_PTR(ret); - goto out; + /* + * Figure out a workable block size. MMC cards have: + * - two block sizes, one for read and one for write. + * - may support partial reads and/or writes + * (allows block sizes smaller than specified) + */ + md->block_bits = card->csd.read_blkbits; + if (card->csd.write_blkbits != card->csd.read_blkbits) { + if (card->csd.write_blkbits < card->csd.read_blkbits && + card->csd.read_partial) { + /* + * write block size is smaller than read block + * size, but we support partial reads, so choose + * the smaller write block size. + */ + md->block_bits = card->csd.write_blkbits; + } else if (card->csd.write_blkbits > card->csd.read_blkbits && + card->csd.write_partial) { + /* + * read block size is smaller than write block + * size, but we support partial writes. Use read + * block size. + */ + } else { + /* + * We don't support this configuration for writes. + */ + printk(KERN_ERR "%s: unable to select block size for " + "writing (rb%u wb%u rp%u wp%u)\n", + mmc_card_id(card), + 1 << card->csd.read_blkbits, + 1 << card->csd.write_blkbits, + card->csd.read_partial, + card->csd.write_partial); + md->read_only = 1; } - md->queue.prep_fn = mmc_blk_prep_rq; - md->queue.issue_fn = mmc_blk_issue_rq; - md->queue.data = md; + } + + /* + * Refuse to allow block sizes smaller than 512 bytes. + */ + if (md->block_bits < 9) { + printk(KERN_ERR "%s: unable to support block size %u\n", + mmc_card_id(card), 1 << md->block_bits); + ret = -EINVAL; + goto err_kfree; + } - 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; + md->disk = alloc_disk(1 << MMC_SHIFT); + if (md->disk == NULL) { + ret = -ENOMEM; + goto err_kfree; + } - /* - * 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. - */ + spin_lock_init(&md->lock); + md->usage = 1; - sprintf(md->disk->disk_name, "mmcblk%d", devidx); - sprintf(md->disk->devfs_name, "mmc/blk%d", devidx); + ret = mmc_init_queue(&md->queue, card, &md->lock); + if (ret) + goto err_putdisk; - md->block_bits = card->csd.read_blkbits; + md->queue.prep_fn = mmc_blk_prep_rq; + md->queue.issue_fn = mmc_blk_issue_rq; + md->queue.data = md; - blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits); - set_capacity(md->disk, card->csd.capacity); - } - out: + 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); + + blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits); + + /* + * 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 @@ -364,8 +436,8 @@ mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card) mmc_card_claim_host(card); cmd.opcode = MMC_SET_BLOCKLEN; - cmd.arg = 1 << card->csd.read_blkbits; - cmd.flags = MMC_RSP_R1; + cmd.arg = 1 << md->block_bits; + cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; err = mmc_wait_for_cmd(card->host, &cmd, 5); mmc_card_release_host(card); @@ -389,12 +461,6 @@ static int mmc_blk_probe(struct mmc_card *card) if (!(card->csd.cmdclass & CCC_BLOCK_READ)) 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); @@ -403,9 +469,10 @@ static int mmc_blk_probe(struct mmc_card *card) if (err) goto out; - printk(KERN_INFO "%s: %s %s %dKiB\n", + printk(KERN_INFO "%s: %s %s %lluKiB %s\n", md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), - (card->csd.capacity << card->csd.read_blkbits) / 1024); + (unsigned long long)(get_capacity(md->disk) >> 1), + md->read_only ? "(ro)" : ""); mmc_set_drvdata(card, md); add_disk(md->disk);