1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * (C) Copyright 2000-2004
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
12 #ifdef CONFIG_SYS_64BIT_LBA
13 typedef uint64_t lbaint_t;
14 #define LBAFlength "ll"
16 typedef ulong lbaint_t;
17 #define LBAFlength "l"
19 #define LBAF "%" LBAFlength "x"
20 #define LBAFU "%" LBAFlength "u"
24 /* Interface types: */
41 IF_TYPE_COUNT, /* Number of interface types */
44 #define BLK_VEN_SIZE 40
45 #define BLK_PRD_SIZE 20
46 #define BLK_REV_SIZE 8
49 * Identifies the partition table type (ie. MBR vs GPT GUID) signature
56 SIG_TYPE_COUNT /* Number of signature types */
60 * With driver model (CONFIG_BLK) this is uclass platform data, accessible
61 * with dev_get_uclass_plat(dev)
65 * TODO: With driver model we should be able to use the parent
66 * device's uclass instead.
68 enum if_type if_type; /* type of the interface */
69 int devnum; /* device number */
70 unsigned char part_type; /* partition type */
71 unsigned char target; /* target SCSI ID */
72 unsigned char lun; /* target LUN */
73 unsigned char hwpart; /* HW partition, e.g. for eMMC */
74 unsigned char type; /* device type */
75 unsigned char removable; /* removable device */
77 /* device can use 48bit addr (ATA/ATAPI v7) */
80 lbaint_t lba; /* number of blocks */
81 unsigned long blksz; /* block size */
82 int log2blksz; /* for convenience: log2(blksz) */
83 char vendor[BLK_VEN_SIZE + 1]; /* device vendor string */
84 char product[BLK_PRD_SIZE + 1]; /* device product number */
85 char revision[BLK_REV_SIZE + 1]; /* firmware revision */
86 enum sig_type sig_type; /* Partition table signature type */
88 uint32_t mbr_sig; /* MBR integer signature */
89 efi_guid_t guid_sig; /* GPT GUID Signature */
91 #if CONFIG_IS_ENABLED(BLK)
93 * For now we have a few functions which take struct blk_desc as a
94 * parameter. This field allows them to look up the associated
95 * device. Once these functions are removed we can drop this field.
99 unsigned long (*block_read)(struct blk_desc *block_dev,
103 unsigned long (*block_write)(struct blk_desc *block_dev,
107 unsigned long (*block_erase)(struct blk_desc *block_dev,
110 void *priv; /* driver private struct pointer */
114 #define BLOCK_CNT(size, blk_desc) (PAD_COUNT(size, blk_desc->blksz))
115 #define PAD_TO_BLOCKSIZE(size, blk_desc) \
116 (PAD_SIZE(size, blk_desc->blksz))
118 #if CONFIG_IS_ENABLED(BLOCK_CACHE)
121 * blkcache_init() - initialize the block cache list pointers
123 int blkcache_init(void);
126 * blkcache_read() - attempt to read a set of blocks from cache
128 * @param iftype - IF_TYPE_x for type of device
129 * @param dev - device index of particular type
130 * @param start - starting block number
131 * @param blkcnt - number of blocks to read
132 * @param blksz - size in bytes of each block
133 * @param buf - buffer to contain cached data
135 * @return - 1 if block returned from cache, 0 otherwise.
137 int blkcache_read(int iftype, int dev,
138 lbaint_t start, lbaint_t blkcnt,
139 unsigned long blksz, void *buffer);
142 * blkcache_fill() - make data read from a block device available
145 * @param iftype - IF_TYPE_x for type of device
146 * @param dev - device index of particular type
147 * @param start - starting block number
148 * @param blkcnt - number of blocks available
149 * @param blksz - size in bytes of each block
150 * @param buf - buffer containing data to cache
153 void blkcache_fill(int iftype, int dev,
154 lbaint_t start, lbaint_t blkcnt,
155 unsigned long blksz, void const *buffer);
158 * blkcache_invalidate() - discard the cache for a set of blocks
159 * because of a write or device (re)initialization.
161 * @param iftype - IF_TYPE_x for type of device
162 * @param dev - device index of particular type
164 void blkcache_invalidate(int iftype, int dev);
167 * blkcache_configure() - configure block cache
169 * @param blocks - maximum blocks per entry
170 * @param entries - maximum entries in cache
172 void blkcache_configure(unsigned blocks, unsigned entries);
175 * statistics of the block cache
177 struct block_cache_stats {
180 unsigned entries; /* current entry count */
181 unsigned max_blocks_per_entry;
182 unsigned max_entries;
186 * get_blkcache_stats() - return statistics and reset
188 * @param stats - statistics are copied here
190 void blkcache_stats(struct block_cache_stats *stats);
194 static inline int blkcache_read(int iftype, int dev,
195 lbaint_t start, lbaint_t blkcnt,
196 unsigned long blksz, void *buffer)
201 static inline void blkcache_fill(int iftype, int dev,
202 lbaint_t start, lbaint_t blkcnt,
203 unsigned long blksz, void const *buffer) {}
205 static inline void blkcache_invalidate(int iftype, int dev) {}
209 #if CONFIG_IS_ENABLED(BLK)
212 /* Operations on block devices */
215 * read() - read from a block device
217 * @dev: Device to read from
218 * @start: Start block number to read (0=first)
219 * @blkcnt: Number of blocks to read
220 * @buffer: Destination buffer for data read
221 * @return number of blocks read, or -ve error number (see the
222 * IS_ERR_VALUE() macro
224 unsigned long (*read)(struct udevice *dev, lbaint_t start,
225 lbaint_t blkcnt, void *buffer);
228 * write() - write to a block device
230 * @dev: Device to write to
231 * @start: Start block number to write (0=first)
232 * @blkcnt: Number of blocks to write
233 * @buffer: Source buffer for data to write
234 * @return number of blocks written, or -ve error number (see the
235 * IS_ERR_VALUE() macro
237 unsigned long (*write)(struct udevice *dev, lbaint_t start,
238 lbaint_t blkcnt, const void *buffer);
241 * erase() - erase a section of a block device
243 * @dev: Device to (partially) erase
244 * @start: Start block number to erase (0=first)
245 * @blkcnt: Number of blocks to erase
246 * @return number of blocks erased, or -ve error number (see the
247 * IS_ERR_VALUE() macro
249 unsigned long (*erase)(struct udevice *dev, lbaint_t start,
253 * select_hwpart() - select a particular hardware partition
255 * Some devices (e.g. MMC) can support partitioning at the hardware
256 * level. This is quite separate from the normal idea of
257 * software-based partitions. MMC hardware partitions must be
258 * explicitly selected. Once selected only the region of the device
259 * covered by that partition is accessible.
261 * The MMC standard provides for two boot partitions (numbered 1 and 2),
262 * rpmb (3), and up to 4 addition general-purpose partitions (4-7).
264 * @desc: Block device to update
265 * @hwpart: Hardware partition number to select. 0 means the raw
266 * device, 1 is the first partition, 2 is the second, etc.
267 * @return 0 if OK, -ve on error
269 int (*select_hwpart)(struct udevice *dev, int hwpart);
272 #define blk_get_ops(dev) ((struct blk_ops *)(dev)->driver->ops)
275 * These functions should take struct udevice instead of struct blk_desc,
276 * but this is convenient for migration to driver model. Add a 'd' prefix
277 * to the function operations, so that blk_read(), etc. can be reserved for
278 * functions with the correct arguments.
280 unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start,
281 lbaint_t blkcnt, void *buffer);
282 unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
283 lbaint_t blkcnt, const void *buffer);
284 unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start,
288 * blk_find_device() - Find a block device
290 * This function does not activate the device. The device will be returned
291 * whether or not it is activated.
293 * @if_type: Interface type (enum if_type_t)
294 * @devnum: Device number (specific to each interface type)
295 * @devp: the device, if found
296 * @return 0 if found, -ENODEV if no device found, or other -ve error value
298 int blk_find_device(int if_type, int devnum, struct udevice **devp);
301 * blk_get_device() - Find and probe a block device ready for use
303 * @if_type: Interface type (enum if_type_t)
304 * @devnum: Device number (specific to each interface type)
305 * @devp: the device, if found
306 * @return 0 if found, -ENODEV if no device found, or other -ve error value
308 int blk_get_device(int if_type, int devnum, struct udevice **devp);
311 * blk_first_device() - Find the first device for a given interface
313 * The device is probed ready for use
315 * @devnum: Device number (specific to each interface type)
316 * @devp: the device, if found
317 * @return 0 if found, -ENODEV if no device, or other -ve error value
319 int blk_first_device(int if_type, struct udevice **devp);
322 * blk_next_device() - Find the next device for a given interface
324 * This can be called repeatedly after blk_first_device() to iterate through
325 * all devices of the given interface type.
327 * The device is probed ready for use
329 * @devp: On entry, the previous device returned. On exit, the next
331 * @return 0 if found, -ENODEV if no device, or other -ve error value
333 int blk_next_device(struct udevice **devp);
336 * blk_create_device() - Create a new block device
338 * @parent: Parent of the new device
339 * @drv_name: Driver name to use for the block device
340 * @name: Name for the device
341 * @if_type: Interface type (enum if_type_t)
342 * @devnum: Device number, specific to the interface type, or -1 to
343 * allocate the next available number
344 * @blksz: Block size of the device in bytes (typically 512)
345 * @lba: Total number of blocks of the device
346 * @devp: the new device (which has not been probed)
348 int blk_create_device(struct udevice *parent, const char *drv_name,
349 const char *name, int if_type, int devnum, int blksz,
350 lbaint_t lba, struct udevice **devp);
353 * blk_create_devicef() - Create a new named block device
355 * @parent: Parent of the new device
356 * @drv_name: Driver name to use for the block device
357 * @name: Name for the device (parent name is prepended)
358 * @if_type: Interface type (enum if_type_t)
359 * @devnum: Device number, specific to the interface type, or -1 to
360 * allocate the next available number
361 * @blksz: Block size of the device in bytes (typically 512)
362 * @lba: Total number of blocks of the device
363 * @devp: the new device (which has not been probed)
365 int blk_create_devicef(struct udevice *parent, const char *drv_name,
366 const char *name, int if_type, int devnum, int blksz,
367 lbaint_t lba, struct udevice **devp);
370 * blk_unbind_all() - Unbind all device of the given interface type
372 * The devices are removed and then unbound.
374 * @if_type: Interface type to unbind
375 * @return 0 if OK, -ve on error
377 int blk_unbind_all(int if_type);
380 * blk_find_max_devnum() - find the maximum device number for an interface type
382 * Finds the last allocated device number for an interface type @if_type. The
383 * next number is safe to use for a newly allocated device.
385 * @if_type: Interface type to scan
386 * @return maximum device number found, or -ENODEV if none, or other -ve on
389 int blk_find_max_devnum(enum if_type if_type);
392 * blk_next_free_devnum() - get the next device number for an interface type
394 * Finds the next number that is safe to use for a newly allocated device for
395 * an interface type @if_type.
397 * @if_type: Interface type to scan
398 * @return next device number safe to use, or -ve on error
400 int blk_next_free_devnum(enum if_type if_type);
403 * blk_select_hwpart() - select a hardware partition
405 * Select a hardware partition if the device supports it (typically MMC does)
407 * @dev: Device to update
408 * @hwpart: Partition number to select
409 * @return 0 if OK, -ve on error
411 int blk_select_hwpart(struct udevice *dev, int hwpart);
414 * blk_get_from_parent() - obtain a block device by looking up its parent
418 int blk_get_from_parent(struct udevice *parent, struct udevice **devp);
421 * blk_get_by_device() - Get the block device descriptor for the given device
422 * @dev: Instance of a storage device
424 * Return: With block device descriptor on success , NULL if there is no such
427 struct blk_desc *blk_get_by_device(struct udevice *dev);
432 * These functions should take struct udevice instead of struct blk_desc,
433 * but this is convenient for migration to driver model. Add a 'd' prefix
434 * to the function operations, so that blk_read(), etc. can be reserved for
435 * functions with the correct arguments.
437 static inline ulong blk_dread(struct blk_desc *block_dev, lbaint_t start,
438 lbaint_t blkcnt, void *buffer)
441 if (blkcache_read(block_dev->if_type, block_dev->devnum,
442 start, blkcnt, block_dev->blksz, buffer))
446 * We could check if block_read is NULL and return -ENOSYS. But this
447 * bloats the code slightly (cause some board to fail to build), and
448 * it would be an error to try an operation that does not exist.
450 blks_read = block_dev->block_read(block_dev, start, blkcnt, buffer);
451 if (blks_read == blkcnt)
452 blkcache_fill(block_dev->if_type, block_dev->devnum,
453 start, blkcnt, block_dev->blksz, buffer);
458 static inline ulong blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
459 lbaint_t blkcnt, const void *buffer)
461 blkcache_invalidate(block_dev->if_type, block_dev->devnum);
462 return block_dev->block_write(block_dev, start, blkcnt, buffer);
465 static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start,
468 blkcache_invalidate(block_dev->if_type, block_dev->devnum);
469 return block_dev->block_erase(block_dev, start, blkcnt);
473 * struct blk_driver - Driver for block interface types
475 * This provides access to the block devices for each interface type. One
476 * driver should be provided using U_BOOT_LEGACY_BLK() for each interface
477 * type that is to be supported.
479 * @if_typename: Interface type name
480 * @if_type: Interface type
481 * @max_devs: Maximum number of devices supported
482 * @desc: Pointer to list of devices for this interface type,
483 * or NULL to use @get_dev() instead
486 const char *if_typename;
487 enum if_type if_type;
489 struct blk_desc *desc;
491 * get_dev() - get a pointer to a block device given its number
493 * Each interface allocates its own devices and typically
494 * struct blk_desc is contained with the interface's data structure.
495 * There is no global numbering for block devices. This method allows
496 * the device for an interface type to be obtained when @desc is NULL.
498 * @devnum: Device number (0 for first device on that interface,
500 * @descp: Returns pointer to the block device on success
501 * @return 0 if OK, -ve on error
503 int (*get_dev)(int devnum, struct blk_desc **descp);
506 * select_hwpart() - Select a hardware partition
508 * Some devices (e.g. MMC) can support partitioning at the hardware
509 * level. This is quite separate from the normal idea of
510 * software-based partitions. MMC hardware partitions must be
511 * explicitly selected. Once selected only the region of the device
512 * covered by that partition is accessible.
514 * The MMC standard provides for two boot partitions (numbered 1 and 2),
515 * rpmb (3), and up to 4 addition general-purpose partitions (4-7).
516 * Partition 0 is the main user-data partition.
518 * @desc: Block device descriptor
519 * @hwpart: Hardware partition number to select. 0 means the main
520 * user-data partition, 1 is the first partition, 2 is
522 * @return 0 if OK, other value for an error
524 int (*select_hwpart)(struct blk_desc *desc, int hwpart);
528 * Declare a new U-Boot legacy block driver. New drivers should use driver
529 * model (UCLASS_BLK).
531 #define U_BOOT_LEGACY_BLK(__name) \
532 ll_entry_declare(struct blk_driver, __name, blk_driver)
534 struct blk_driver *blk_driver_lookup_type(int if_type);
536 #endif /* !CONFIG_BLK */
539 * blk_get_devnum_by_typename() - Get a block device by type and number
541 * This looks through the available block devices of the given type, returning
542 * the one with the given @devnum.
544 * @if_type: Block device type
545 * @devnum: Device number
546 * @return point to block device descriptor, or NULL if not found
548 struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum);
551 * blk_get_devnum_by_type() - Get a block device by type name, and number
553 * This looks up the block device type based on @if_typename, then calls
554 * blk_get_devnum_by_type().
556 * @if_typename: Block device type name
557 * @devnum: Device number
558 * @return point to block device descriptor, or NULL if not found
560 struct blk_desc *blk_get_devnum_by_typename(const char *if_typename,
564 * blk_dselect_hwpart() - select a hardware partition
566 * This selects a hardware partition (such as is supported by MMC). The block
567 * device size may change as this effectively points the block device to a
568 * partition at the hardware level. See the select_hwpart() method above.
570 * @desc: Block device descriptor for the device to select
571 * @hwpart: Partition number to select
572 * @return 0 if OK, -ve on error
574 int blk_dselect_hwpart(struct blk_desc *desc, int hwpart);
577 * blk_list_part() - list the partitions for block devices of a given type
579 * This looks up the partition type for each block device of type @if_type,
580 * then displays a list of partitions.
582 * @if_type: Block device type
583 * @return 0 if OK, -ENODEV if there is none of that type
585 int blk_list_part(enum if_type if_type);
588 * blk_list_devices() - list the block devices of a given type
590 * This lists each block device of the type @if_type, showing the capacity
591 * as well as type-specific information.
593 * @if_type: Block device type
595 void blk_list_devices(enum if_type if_type);
598 * blk_show_device() - show information about a given block device
600 * This shows the block device capacity as well as type-specific information.
602 * @if_type: Block device type
603 * @devnum: Device number
604 * @return 0 if OK, -ENODEV for invalid device number
606 int blk_show_device(enum if_type if_type, int devnum);
609 * blk_print_device_num() - show information about a given block device
611 * This is similar to blk_show_device() but returns an error if the block
612 * device type is unknown.
614 * @if_type: Block device type
615 * @devnum: Device number
616 * @return 0 if OK, -ENODEV for invalid device number, -ENOENT if the block
617 * device is not connected
619 int blk_print_device_num(enum if_type if_type, int devnum);
622 * blk_print_part_devnum() - print the partition information for a device
624 * @if_type: Block device type
625 * @devnum: Device number
626 * @return 0 if OK, -ENOENT if the block device is not connected, -ENOSYS if
627 * the interface type is not supported, other -ve on other error
629 int blk_print_part_devnum(enum if_type if_type, int devnum);
632 * blk_read_devnum() - read blocks from a device
634 * @if_type: Block device type
635 * @devnum: Device number
636 * @blkcnt: Number of blocks to read
637 * @buffer: Address to write data to
638 * @return number of blocks read, or -ve error number on error
640 ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start,
641 lbaint_t blkcnt, void *buffer);
644 * blk_write_devnum() - write blocks to a device
646 * @if_type: Block device type
647 * @devnum: Device number
648 * @blkcnt: Number of blocks to write
649 * @buffer: Address to read data from
650 * @return number of blocks written, or -ve error number on error
652 ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start,
653 lbaint_t blkcnt, const void *buffer);
656 * blk_select_hwpart_devnum() - select a hardware partition
658 * This is similar to blk_dselect_hwpart() but it looks up the interface and
661 * @if_type: Block device type
662 * @devnum: Device number
663 * @hwpart: Partition number to select
664 * @return 0 if OK, -ve on error
666 int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart);
669 * blk_get_if_type_name() - Get the name of an interface type
671 * @if_type: Interface type to check
672 * @return name of interface, or NULL if none
674 const char *blk_get_if_type_name(enum if_type if_type);
677 * blk_common_cmd() - handle common commands with block devices
679 * @args: Number of arguments to the command (argv[0] is the command itself)
680 * @argv: Command arguments
681 * @if_type: Interface type
682 * @cur_devnump: Current device number for this interface type
683 * @return 0 if OK, CMD_RET_ERROR on error
685 int blk_common_cmd(int argc, char *const argv[], enum if_type if_type,
690 BLKF_REMOVABLE = 1 << 1,
691 BLKF_BOTH = BLKF_FIXED | BLKF_REMOVABLE,
695 * blk_first_device_err() - Get the first block device
697 * The device returned is probed if necessary, and ready for use
699 * @flags: Indicates type of device to return
700 * @devp: Returns pointer to the first device in that uclass, or NULL if none
701 * @return 0 if found, -ENODEV if not found, other -ve on error
703 int blk_first_device_err(enum blk_flag_t flags, struct udevice **devp);
706 * blk_next_device_err() - Get the next block device
708 * The device returned is probed if necessary, and ready for use
710 * @flags: Indicates type of device to return
711 * @devp: On entry, pointer to device to lookup. On exit, returns pointer
712 * to the next device in the uclass if no error occurred, or -ENODEV if
713 * there is no next device.
714 * @return 0 if found, -ENODEV if not found, other -ve on error
716 int blk_next_device_err(enum blk_flag_t flags, struct udevice **devp);
719 * blk_foreach_probe() - Helper function to iteration through block devices
721 * This creates a for() loop which works through the available devices in
722 * a uclass in order from start to end. Devices are probed if necessary,
725 * @flags: Indicates type of device to return
726 * @dev: struct udevice * to hold the current device. Set to NULL when there
727 * are no more devices.
729 #define blk_foreach_probe(flags, pos) \
730 for (int _ret = blk_first_device_err(flags, &(pos)); \
732 _ret = blk_next_device_err(flags, &(pos)))
735 * blk_count_devices() - count the number of devices of a particular type
737 * @flags: Indicates type of device to find
738 * @return number of devices matching those flags
740 int blk_count_devices(enum blk_flag_t flag);