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* dm: blk: Add a comment as to why the bdev member is neededSimon Glass2016-05-171-0/+5
| | | | | | | This member should be explained, since it is not obvious why it is needed. Add a comment. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: blk: Add functions to select a hardware partitionSimon Glass2016-05-171-0/+30
| | | | | | | | The block device uclass does not currently support selecting a particular hardware partition but this is needed for MMC. Add it so that the blk API can support MMC properly. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: blk: Add a easier way to create a named block deviceSimon Glass2016-05-171-0/+17
| | | | | | | | Add a function that automatically builds the device name given the parent and a supplied string. Most callers will want to do this, so putting this functionality in one place makes more sense. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: blk: Allow blk_create_device() to allocate the device numberSimon Glass2016-05-171-1/+14
| | | | | | | | Allow a devnum parameter of -1 to indicate that the device number should be alocated automatically. The next highest available device number for that interface type is used. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: systemace: Add a legacy block interfaceSimon Glass2016-05-171-0/+1
| | | | | | Add a legacy block interface for systemace. Signed-off-by: Simon Glass <sjg@chromium.org>
* dm: blk: Add a legacy block interfaceSimon Glass2016-05-171-0/+195
| | | | | | | | | | There is quite a bit of duplicated common code related to block devices in the IDE and SCSI implementations. Create some helper functions that can be used to reduce the duplication. These rely on a linker list of interface-type drivers Signed-off-by: Simon Glass <sjg@chromium.org>
* drivers: block: fix placement of parametersEric Nelson2016-04-111-20/+14
| | | | Signed-off-by: Eric Nelson <eric@nelint.com>
* drivers: block: add block device cacheEric Nelson2016-04-011-1/+104
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a block device cache to speed up repeated reads of block devices by various filesystems. This small amount of cache can dramatically speed up filesystem operations by skipping repeated reads of common areas of a block device (typically directory structures). This has shown to have some benefit on FAT filesystem operations of loading a kernel and RAM disk, but more dramatic benefits on ext4 filesystems when the kernel and/or RAM disk are spread across multiple extent header structures as described in commit fc0fc50. The cache is implemented through a minimal list (block_cache) maintained in most-recently-used order and count of the current number of entries (cache_count). It uses a maximum block count setting to prevent copies of large block reads and an upper bound on the number of cached areas. The maximum number of entries in the cache defaults to 32 and the maximum number of blocks per cache entry has a default of 2, which has shown to produce the best results on testing of ext4 and FAT filesystems. The 'blkcache' command (enabled through CONFIG_CMD_BLOCK_CACHE) allows changing these values and can be used to tune for a particular filesystem layout. Signed-off-by: Eric Nelson <eric@nelint.com>
* dm: blk: Add a block-device uclassSimon Glass2016-03-141-0/+145
| | | | | | | | | Add a uclass for block devices. These provide block-oriented data access, supporting reading, writing and erasing of whole blocks. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Stephen Warren <swarren@nvidia.com>
* dm: block: Adjust device calls to go through helpers functionSimon Glass2016-03-141-0/+29
| | | | | | | | | | | | To ease conversion to driver model, add helper functions which deal with calling each block device method. With driver model we can reimplement these functions with the same arguments. Use inline functions to avoid increasing code size on some boards. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Stephen Warren <swarren@nvidia.com>
* dm: block: Rename device number member dev to devnumSimon Glass2016-03-141-1/+1
| | | | | | | | | This is a device number, and we want to use 'dev' to mean a driver model device. Rename the member. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Stephen Warren <swarren@nvidia.com>
* dm: blk: Convert interface type to an enumSimon Glass2016-03-141-12/+15
| | | | | | | | | | | | Since these are sequentially numbered it makes sense to use an enum. It avoids having to maintain the maximum value, and provides a type we can use if it is useful. In fact the maximum value is not used. Rename it to COUNT, since MAX suggests it is the maximum valid value, but it is not. Signed-off-by: Simon Glass <sjg@chromium.org> Tested-by: Stephen Warren <swarren@nvidia.com>
* dm: Add a new header for block devicesSimon Glass2016-03-141-0/+71
At present block devices are tied up with partitions. But not all block devices have partitions within them. They are in fact separate concepts. Create a separate blk.h header file for block devices. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Stephen Warren <swarren@nvidia.com>
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