diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/blk.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/include/blk.h b/include/blk.h index f62467105a..a562c10a29 100644 --- a/include/blk.h +++ b/include/blk.h @@ -340,6 +340,201 @@ static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start, blkcache_invalidate(block_dev->if_type, block_dev->devnum); return block_dev->block_erase(block_dev, start, blkcnt); } + +/** + * struct blk_driver - Driver for block interface types + * + * This provides access to the block devices for each interface type. One + * driver should be provided using U_BOOT_LEGACY_BLK() for each interface + * type that is to be supported. + * + * @if_typename: Interface type name + * @if_type: Interface type + * @max_devs: Maximum number of devices supported + * @desc: Pointer to list of devices for this interface type, + * or NULL to use @get_dev() instead + */ +struct blk_driver { + const char *if_typename; + enum if_type if_type; + int max_devs; + struct blk_desc *desc; + /** + * get_dev() - get a pointer to a block device given its number + * + * Each interface allocates its own devices and typically + * struct blk_desc is contained with the interface's data structure. + * There is no global numbering for block devices. This method allows + * the device for an interface type to be obtained when @desc is NULL. + * + * @devnum: Device number (0 for first device on that interface, + * 1 for second, etc. + * @descp: Returns pointer to the block device on success + * @return 0 if OK, -ve on error + */ + int (*get_dev)(int devnum, struct blk_desc **descp); + + /** + * select_hwpart() - Select a hardware partition + * + * Some devices (e.g. MMC) can support partitioning at the hardware + * level. This is quite separate from the normal idea of + * software-based partitions. MMC hardware partitions must be + * explicitly selected. Once selected only the region of the device + * covered by that partition is accessible. + * + * The MMC standard provides for two boot partitions (numbered 1 and 2), + * rpmb (3), and up to 4 addition general-purpose partitions (4-7). + * Partition 0 is the main user-data partition. + * + * @desc: Block device descriptor + * @hwpart: Hardware partition number to select. 0 means the main + * user-data partition, 1 is the first partition, 2 is + * the second, etc. + * @return 0 if OK, other value for an error + */ + int (*select_hwpart)(struct blk_desc *desc, int hwpart); +}; + +/* + * Declare a new U-Boot legacy block driver. New drivers should use driver + * model (UCLASS_BLK). + */ +#define U_BOOT_LEGACY_BLK(__name) \ + ll_entry_declare(struct blk_driver, __name, blk_driver) + +struct blk_driver *blk_driver_lookup_type(int if_type); + #endif /* !CONFIG_BLK */ +/** + * blk_get_devnum_by_typename() - Get a block device by type and number + * + * This looks through the available block devices of the given type, returning + * the one with the given @devnum. + * + * @if_type: Block device type + * @devnum: Device number + * @return point to block device descriptor, or NULL if not found + */ +struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum); + +/** + * blk_get_devnum_by_type() - Get a block device by type name, and number + * + * This looks up the block device type based on @if_typename, then calls + * blk_get_devnum_by_type(). + * + * @if_typename: Block device type name + * @devnum: Device number + * @return point to block device descriptor, or NULL if not found + */ +struct blk_desc *blk_get_devnum_by_typename(const char *if_typename, + int devnum); + +/** + * blk_dselect_hwpart() - select a hardware partition + * + * This selects a hardware partition (such as is supported by MMC). The block + * device size may change as this effectively points the block device to a + * partition at the hardware level. See the select_hwpart() method above. + * + * @desc: Block device descriptor for the device to select + * @hwpart: Partition number to select + * @return 0 if OK, -ve on error + */ +int blk_dselect_hwpart(struct blk_desc *desc, int hwpart); + +/** + * blk_list_part() - list the partitions for block devices of a given type + * + * This looks up the partition type for each block device of type @if_type, + * then displays a list of partitions. + * + * @if_type: Block device type + * @return 0 if OK, -ENODEV if there is none of that type + */ +int blk_list_part(enum if_type if_type); + +/** + * blk_list_devices() - list the block devices of a given type + * + * This lists each block device of the type @if_type, showing the capacity + * as well as type-specific information. + * + * @if_type: Block device type + */ +void blk_list_devices(enum if_type if_type); + +/** + * blk_show_device() - show information about a given block device + * + * This shows the block device capacity as well as type-specific information. + * + * @if_type: Block device type + * @devnum: Device number + * @return 0 if OK, -ENODEV for invalid device number + */ +int blk_show_device(enum if_type if_type, int devnum); + +/** + * blk_print_device_num() - show information about a given block device + * + * This is similar to blk_show_device() but returns an error if the block + * device type is unknown. + * + * @if_type: Block device type + * @devnum: Device number + * @return 0 if OK, -ENODEV for invalid device number, -ENOENT if the block + * device is not connected + */ +int blk_print_device_num(enum if_type if_type, int devnum); + +/** + * blk_print_part_devnum() - print the partition information for a device + * + * @if_type: Block device type + * @devnum: Device number + * @return 0 if OK, -ENOENT if the block device is not connected, -ENOSYS if + * the interface type is not supported, other -ve on other error + */ +int blk_print_part_devnum(enum if_type if_type, int devnum); + +/** + * blk_read_devnum() - read blocks from a device + * + * @if_type: Block device type + * @devnum: Device number + * @blkcnt: Number of blocks to read + * @buffer: Address to write data to + * @return number of blocks read, or -ve error number on error + */ +ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start, + lbaint_t blkcnt, void *buffer); + +/** + * blk_write_devnum() - write blocks to a device + * + * @if_type: Block device type + * @devnum: Device number + * @blkcnt: Number of blocks to write + * @buffer: Address to read data from + * @return number of blocks written, or -ve error number on error + */ +ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start, + lbaint_t blkcnt, const void *buffer); + +/** + * blk_select_hwpart_devnum() - select a hardware partition + * + * This is similar to blk_dselect_hwpart() but it looks up the interface and + * device number. + * + * @if_type: Block device type + * @devnum: Device number + * @hwpart: Partition number to select + * @return 0 if OK, -ve on error + */ +int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart); + #endif |
