5 files changed, 158 insertions, 75 deletions

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index eb41391..6696f71 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -550,6 +550,11 @@ static void mmc_decode_csd(struct mmc_card *card)
 		csd->capacity	  = (1 + m) << (e + 2);
 
 		csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
+		csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
+		csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
+		csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
+		csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
+		csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 	} else {
 		/*
 		 * We only understand CSD structure v1.1 and v1.2.
@@ -579,6 +584,11 @@ static void mmc_decode_csd(struct mmc_card *card)
 		csd->capacity	  = (1 + m) << (e + 2);
 
 		csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
+		csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
+		csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
+		csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
+		csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
+		csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 	}
 }
 
diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
index 8e380c1..198561d 100644
--- a/drivers/mmc/mmc_block.c
+++ b/drivers/mmc/mmc_block.c
@@ -54,6 +54,7 @@ struct mmc_blk_data {
 
 	unsigned int	usage;
 	unsigned int	block_bits;
+	unsigned int	read_only;
 };
 
 static DECLARE_MUTEX(open_lock);
@@ -85,12 +86,6 @@ static void mmc_blk_put(struct mmc_blk_data *md)
 	up(&open_lock);
 }
 
-static inline int mmc_blk_readonly(struct mmc_card *card)
-{
-	return mmc_card_readonly(card) ||
-	       !(card->csd.cmdclass & CCC_BLOCK_WRITE);
-}
-
 static int mmc_blk_open(struct inode *inode, struct file *filp)
 {
 	struct mmc_blk_data *md;
@@ -102,8 +97,7 @@ static int mmc_blk_open(struct inode *inode, struct file *filp)
 			check_disk_change(inode->i_bdev);
 		ret = 0;
 
-		if ((filp->f_mode & FMODE_WRITE) &&
-			mmc_blk_readonly(md->queue.card))
+		if ((filp->f_mode & FMODE_WRITE) && md->read_only)
 			ret = -EROFS;
 	}
 
@@ -299,6 +293,12 @@ 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;
@@ -310,64 +310,121 @@ 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",
+				md->disk->disk_name,
+				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;
+	}
 
-		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;
+	/*
+	 * 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;
+	}
 
-		/*
-		 * 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.
-		 */
+	md->disk = alloc_disk(1 << MMC_SHIFT);
+	if (md->disk == NULL) {
+		ret = -ENOMEM;
+		goto err_kfree;
+	}
 
-		sprintf(md->disk->disk_name, "mmcblk%d", devidx);
-		sprintf(md->disk->devfs_name, "mmc/blk%d", devidx);
+	spin_lock_init(&md->lock);
+	md->usage = 1;
 
-		md->block_bits = card->csd.read_blkbits;
+	ret = mmc_init_queue(&md->queue, card, &md->lock);
+	if (ret)
+		goto err_putdisk;
 
-		blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);
+	md->queue.prep_fn = mmc_blk_prep_rq;
+	md->queue.issue_fn = mmc_blk_issue_rq;
+	md->queue.data = md;
 
-		/*
-		 * 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));
-	}
- 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
@@ -403,12 +460,6 @@ 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);
@@ -419,7 +470,7 @@ static int mmc_blk_probe(struct mmc_card *card)
 
 	printk(KERN_INFO "%s: %s %s %luKiB %s\n",
 		md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
-		get_capacity(md->disk) >> 1, mmc_blk_readonly(card)?"(ro)":"");
+		get_capacity(md->disk) >> 1, md->read_only ? "(ro)" : "");
 
 	mmc_set_drvdata(card, md);
 	add_disk(md->disk);
diff --git a/drivers/mmc/mmci.c b/drivers/mmc/mmci.c
index 166c9b0..2b10a2d 100644
--- a/drivers/mmc/mmci.c
+++ b/drivers/mmc/mmci.c
@@ -20,6 +20,7 @@
 #include <linux/mmc/host.h>
 #include <linux/mmc/protocol.h>
 
+#include <asm/cacheflush.h>
 #include <asm/div64.h>
 #include <asm/io.h>
 #include <asm/scatterlist.h>
@@ -157,6 +158,13 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
 		else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
 			data->error = MMC_ERR_FIFO;
 		status |= MCI_DATAEND;
+
+		/*
+		 * We hit an error condition.  Ensure that any data
+		 * partially written to a page is properly coherent.
+		 */
+		if (host->sg_len && data->flags & MMC_DATA_READ)
+			flush_dcache_page(host->sg_ptr->page);
 	}
 	if (status & MCI_DATAEND) {
 		mmci_stop_data(host);
@@ -292,7 +300,7 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id, struct pt_regs *regs)
 		/*
 		 * Unmap the buffer.
 		 */
-		mmci_kunmap_atomic(host, &flags);
+		mmci_kunmap_atomic(host, buffer, &flags);
 
 		host->sg_off += len;
 		host->size -= len;
@@ -301,6 +309,13 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id, struct pt_regs *regs)
 		if (remain)
 			break;
 
+		/*
+		 * If we were reading, and we have completed this
+		 * page, ensure that the data cache is coherent.
+		 */
+		if (status & MCI_RXACTIVE)
+			flush_dcache_page(host->sg_ptr->page);
+
 		if (!mmci_next_sg(host))
 			break;
 
diff --git a/drivers/mmc/mmci.h b/drivers/mmc/mmci.h
index 4589bbd..6d7eadc 100644
--- a/drivers/mmc/mmci.h
+++ b/drivers/mmc/mmci.h
@@ -172,8 +172,8 @@ static inline char *mmci_kmap_atomic(struct mmci_host *host, unsigned long *flag
 	return kmap_atomic(sg->page, KM_BIO_SRC_IRQ) + sg->offset;
 }
 
-static inline void mmci_kunmap_atomic(struct mmci_host *host, unsigned long *flags)
+static inline void mmci_kunmap_atomic(struct mmci_host *host, void *buffer, unsigned long *flags)
 {
-	kunmap_atomic(host->sg_ptr->page, KM_BIO_SRC_IRQ);
+	kunmap_atomic(buffer, KM_BIO_SRC_IRQ);
 	local_irq_restore(*flags);
 }
diff --git a/drivers/mmc/wbsd.c b/drivers/mmc/wbsd.c
index c7eb7c2..4f13bd2 100644
--- a/drivers/mmc/wbsd.c
+++ b/drivers/mmc/wbsd.c
@@ -1456,13 +1456,11 @@ static int __devinit wbsd_scan(struct wbsd_host* host)
 	 * Iterate through all ports, all codes to
 	 * find hardware that is in our known list.
 	 */
-	for (i = 0;i < sizeof(config_ports)/sizeof(int);i++)
-	{
+	for (i = 0; i < ARRAY_SIZE(config_ports); i++) {
 		if (!request_region(config_ports[i], 2, DRIVER_NAME))
 			continue;
 
-		for (j = 0;j < sizeof(unlock_codes)/sizeof(int);j++)
-		{
+		for (j = 0; j < ARRAY_SIZE(unlock_codes); j++) {
 			id = 0xFFFF;
 
 			host->config = config_ports[i];
@@ -1478,8 +1476,7 @@ static int __devinit wbsd_scan(struct wbsd_host* host)
 
 			wbsd_lock_config(host);
 
-			for (k = 0;k < sizeof(valid_ids)/sizeof(int);k++)
-			{
+			for (k = 0; k < ARRAY_SIZE(valid_ids); k++) {
 				if (id == valid_ids[k])
 				{
 					host->chip_id = id;
@@ -2090,10 +2087,20 @@ static int __init wbsd_drv_init(void)
 		if (result < 0)
 			return result;
 
-		wbsd_device = platform_device_register_simple(DRIVER_NAME, -1,
-			NULL, 0);
-		if (IS_ERR(wbsd_device))
-			return PTR_ERR(wbsd_device);
+		wbsd_device = platform_device_alloc(DRIVER_NAME, -1);
+		if (!wbsd_device)
+		{
+			platform_driver_unregister(&wbsd_driver);
+			return -ENOMEM;
+		}
+
+		result = platform_device_add(wbsd_device);
+		if (result)
+		{
+			platform_device_put(wbsd_device);
+			platform_driver_unregister(&wbsd_driver);
+			return result;
+		}
 	}
 
 	return 0;