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dm: blk: Add a block-device uclass

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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>
This commit is contained in:
Simon Glass
2016-02-29 15:25:55 -07:00
parent 9807c3b78a
commit 09d71aac7b
5 changed files with 334 additions and 0 deletions
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145
include/blk.h
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@@ -34,7 +34,15 @@ enum if_type {
IF_TYPE_COUNT, /* Number of interface types */
};
/*
* With driver model (CONFIG_BLK) this is uclass platform data, accessible
* with dev_get_uclass_platdata(dev)
*/
struct blk_desc {
/*
* TODO: With driver model we should be able to use the parent
* device's uclass instead.
*/
enum if_type if_type; /* type of the interface */
int devnum; /* device number */
unsigned char part_type; /* partition type */
@@ -53,6 +61,9 @@ struct blk_desc {
char vendor[40+1]; /* IDE model, SCSI Vendor */
char product[20+1]; /* IDE Serial no, SCSI product */
char revision[8+1]; /* firmware revision */
#ifdef CONFIG_BLK
struct udevice *bdev;
#else
unsigned long (*block_read)(struct blk_desc *block_dev,
lbaint_t start,
lbaint_t blkcnt,
@@ -65,12 +76,145 @@ struct blk_desc {
lbaint_t start,
lbaint_t blkcnt);
void *priv; /* driver private struct pointer */
#endif
};
#define BLOCK_CNT(size, blk_desc) (PAD_COUNT(size, blk_desc->blksz))
#define PAD_TO_BLOCKSIZE(size, blk_desc) \
(PAD_SIZE(size, blk_desc->blksz))
#ifdef CONFIG_BLK
struct udevice;
/* Operations on block devices */
struct blk_ops {
/**
* read() - read from a block device
*
* @dev: Device to read from
* @start: Start block number to read (0=first)
* @blkcnt: Number of blocks to read
* @buffer: Destination buffer for data read
* @return number of blocks read, or -ve error number (see the
* IS_ERR_VALUE() macro
*/
unsigned long (*read)(struct udevice *dev, lbaint_t start,
lbaint_t blkcnt, void *buffer);
/**
* write() - write to a block device
*
* @dev: Device to write to
* @start: Start block number to write (0=first)
* @blkcnt: Number of blocks to write
* @buffer: Source buffer for data to write
* @return number of blocks written, or -ve error number (see the
* IS_ERR_VALUE() macro
*/
unsigned long (*write)(struct udevice *dev, lbaint_t start,
lbaint_t blkcnt, const void *buffer);
/**
* erase() - erase a section of a block device
*
* @dev: Device to (partially) erase
* @start: Start block number to erase (0=first)
* @blkcnt: Number of blocks to erase
* @return number of blocks erased, or -ve error number (see the
* IS_ERR_VALUE() macro
*/
unsigned long (*erase)(struct udevice *dev, lbaint_t start,
lbaint_t blkcnt);
};
#define blk_get_ops(dev) ((struct blk_ops *)(dev)->driver->ops)
/*
* These functions should take struct udevice instead of struct blk_desc,
* but this is convenient for migration to driver model. Add a 'd' prefix
* to the function operations, so that blk_read(), etc. can be reserved for
* functions with the correct arguments.
*/
unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start,
lbaint_t blkcnt, void *buffer);
unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
lbaint_t blkcnt, const void *buffer);
unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start,
lbaint_t blkcnt);
/**
* blk_get_device() - Find and probe a block device ready for use
*
* @if_type: Interface type (enum if_type_t)
* @devnum: Device number (specific to each interface type)
* @devp: the device, if found
* @return - if found, -ENODEV if no device found, or other -ve error value
*/
int blk_get_device(int if_type, int devnum, struct udevice **devp);
/**
* blk_first_device() - Find the first device for a given interface
*
* The device is probed ready for use
*
* @devnum: Device number (specific to each interface type)
* @devp: the device, if found
* @return 0 if found, -ENODEV if no device, or other -ve error value
*/
int blk_first_device(int if_type, struct udevice **devp);
/**
* blk_next_device() - Find the next device for a given interface
*
* This can be called repeatedly after blk_first_device() to iterate through
* all devices of the given interface type.
*
* The device is probed ready for use
*
* @devp: On entry, the previous device returned. On exit, the next
* device, if found
* @return 0 if found, -ENODEV if no device, or other -ve error value
*/
int blk_next_device(struct udevice **devp);
/**
* blk_create_device() - Create a new block device
*
* @parent: Parent of the new device
* @drv_name: Driver name to use for the block device
* @name: Name for the device
* @if_type: Interface type (enum if_type_t)
* @devnum: Device number, specific to the interface type
* @blksz: Block size of the device in bytes (typically 512)
* @size: Total size of the device in bytes
* @devp: the new device (which has not been probed)
*/
int blk_create_device(struct udevice *parent, const char *drv_name,
const char *name, int if_type, int devnum, int blksz,
lbaint_t size, struct udevice **devp);
/**
* blk_prepare_device() - Prepare a block device for use
*
* This reads partition information from the device if supported.
*
* @dev: Device to prepare
* @return 0 if ok, -ve on error
*/
int blk_prepare_device(struct udevice *dev);
/**
* blk_unbind_all() - Unbind all device of the given interface type
*
* The devices are removed and then unbound.
*
* @if_type: Interface type to unbind
* @return 0 if OK, -ve on error
*/
int blk_unbind_all(int if_type);
#else
#include <errno.h>
/*
* These functions should take struct udevice instead of struct blk_desc,
* but this is convenient for migration to driver model. Add a 'd' prefix
@@ -99,5 +243,6 @@ static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start,
{
return block_dev->block_erase(block_dev, start, blkcnt);
}
#endif /* !CONFIG_BLK */
#endif