1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * (C) Copyright 2000-2004
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 */
6
7 #ifndef BLK_H
8 #define BLK_H
9
10 #include <bouncebuf.h>
11 #include <dm/uclass-id.h>
12 #include <efi.h>
13
14 #ifdef CONFIG_SYS_64BIT_LBA
15 typedef uint64_t lbaint_t;
16 #define LBAFlength "ll"
17 #else
18 typedef ulong lbaint_t;
19 #define LBAFlength "l"
20 #endif
21 #define LBAF "%" LBAFlength "x"
22 #define LBAFU "%" LBAFlength "u"
23
24 #define DEFAULT_BLKSZ 512
25
26 struct udevice;
27
blk_enabled(void)28 static inline bool blk_enabled(void)
29 {
30 return CONFIG_IS_ENABLED(BLK) || IS_ENABLED(CONFIG_SPL_LEGACY_BLOCK);
31 }
32
33 #define BLK_VEN_SIZE 40
34 #define BLK_PRD_SIZE 20
35 #define BLK_REV_SIZE 8
36
37 #define PART_FORMAT_PCAT 0x1
38 #define PART_FORMAT_GPT 0x2
39
40 /*
41 * Identifies the partition table type (ie. MBR vs GPT GUID) signature
42 */
43 enum sig_type {
44 SIG_TYPE_NONE,
45 SIG_TYPE_MBR,
46 SIG_TYPE_GUID,
47
48 SIG_TYPE_COUNT /* Number of signature types */
49 };
50
51 /*
52 * With driver model (CONFIG_BLK) this is uclass platform data, accessible
53 * with dev_get_uclass_plat(dev)
54 */
55 struct blk_desc {
56 /*
57 * TODO: With driver model we should be able to use the parent
58 * device's uclass instead.
59 */
60 enum uclass_id uclass_id; /* type of the interface */
61 int devnum; /* device number */
62 unsigned char part_type; /* partition type */
63 unsigned char target; /* target SCSI ID */
64 unsigned char lun; /* target LUN */
65 unsigned char hwpart; /* HW partition, e.g. for eMMC */
66 unsigned char type; /* device type */
67 unsigned char removable; /* removable device */
68 /* device can use 48bit addr (ATA/ATAPI v7) */
69 bool lba48;
70 unsigned char atapi; /* Use ATAPI protocol */
71 unsigned char bb; /* Use bounce buffer */
72 lbaint_t lba; /* number of blocks */
73 unsigned long blksz; /* block size */
74 int log2blksz; /* for convenience: log2(blksz) */
75 char vendor[BLK_VEN_SIZE + 1]; /* device vendor string */
76 char product[BLK_PRD_SIZE + 1]; /* device product number */
77 char revision[BLK_REV_SIZE + 1]; /* firmware revision */
78 enum sig_type sig_type; /* Partition table signature type */
79 union {
80 uint32_t mbr_sig; /* MBR integer signature */
81 efi_guid_t guid_sig; /* GPT GUID Signature */
82 };
83 #if CONFIG_IS_ENABLED(BLK)
84 /*
85 * For now we have a few functions which take struct blk_desc as a
86 * parameter. This field allows them to look up the associated
87 * device. Once these functions are removed we can drop this field.
88 */
89 struct udevice *bdev;
90 #else
91 unsigned long (*block_read)(struct blk_desc *block_dev,
92 lbaint_t start,
93 lbaint_t blkcnt,
94 void *buffer);
95 unsigned long (*block_write)(struct blk_desc *block_dev,
96 lbaint_t start,
97 lbaint_t blkcnt,
98 const void *buffer);
99 unsigned long (*block_erase)(struct blk_desc *block_dev,
100 lbaint_t start,
101 lbaint_t blkcnt);
102 void *priv; /* driver private struct pointer */
103 #endif
104 };
105
106 #define BLOCK_CNT(size, blk_desc) (PAD_COUNT(size, blk_desc->blksz))
107 #define PAD_TO_BLOCKSIZE(size, blk_desc) \
108 (PAD_SIZE(size, blk_desc->blksz))
109
110 #if CONFIG_IS_ENABLED(BLOCK_CACHE)
111 /**
112 * blkcache_read() - attempt to read a set of blocks from cache
113 *
114 * @param iftype - uclass_id_x for type of device
115 * @param dev - device index of particular type
116 * @param start - starting block number
117 * @param blkcnt - number of blocks to read
118 * @param blksz - size in bytes of each block
119 * @param buffer - buffer to contain cached data
120 *
121 * Return: - 1 if block returned from cache, 0 otherwise.
122 */
123 int blkcache_read(int iftype, int dev,
124 lbaint_t start, lbaint_t blkcnt,
125 unsigned long blksz, void *buffer);
126
127 /**
128 * blkcache_fill() - make data read from a block device available
129 * to the block cache
130 *
131 * @param iftype - uclass_id_x for type of device
132 * @param dev - device index of particular type
133 * @param start - starting block number
134 * @param blkcnt - number of blocks available
135 * @param blksz - size in bytes of each block
136 * @param buffer - buffer containing data to cache
137 *
138 */
139 void blkcache_fill(int iftype, int dev,
140 lbaint_t start, lbaint_t blkcnt,
141 unsigned long blksz, void const *buffer);
142
143 /**
144 * blkcache_invalidate() - discard the cache for a set of blocks
145 * because of a write or device (re)initialization.
146 *
147 * @iftype - UCLASS_ID_ for type of device, or -1 for any
148 * @dev - device index of particular type, if @iftype is not -1
149 */
150 void blkcache_invalidate(int iftype, int dev);
151
152 /**
153 * blkcache_configure() - configure block cache
154 *
155 * @param blocks - maximum blocks per entry
156 * @param entries - maximum entries in cache
157 */
158 void blkcache_configure(unsigned blocks, unsigned entries);
159
160 /*
161 * statistics of the block cache
162 */
163 struct block_cache_stats {
164 unsigned hits;
165 unsigned misses;
166 unsigned entries; /* current entry count */
167 unsigned max_blocks_per_entry;
168 unsigned max_entries;
169 };
170
171 /**
172 * get_blkcache_stats() - return statistics and reset
173 *
174 * @param stats - statistics are copied here
175 */
176 void blkcache_stats(struct block_cache_stats *stats);
177
178 /** blkcache_free() - free all memory allocated to the block cache */
179 void blkcache_free(void);
180
181 #else
182
blkcache_read(int iftype,int dev,lbaint_t start,lbaint_t blkcnt,unsigned long blksz,void * buffer)183 static inline int blkcache_read(int iftype, int dev,
184 lbaint_t start, lbaint_t blkcnt,
185 unsigned long blksz, void *buffer)
186 {
187 return 0;
188 }
189
blkcache_fill(int iftype,int dev,lbaint_t start,lbaint_t blkcnt,unsigned long blksz,void const * buffer)190 static inline void blkcache_fill(int iftype, int dev,
191 lbaint_t start, lbaint_t blkcnt,
192 unsigned long blksz, void const *buffer) {}
193
blkcache_invalidate(int iftype,int dev)194 static inline void blkcache_invalidate(int iftype, int dev) {}
195
blkcache_free(void)196 static inline void blkcache_free(void) {}
197
198 #endif
199
200 struct udevice;
201
202 /* Operations on block devices */
203 struct blk_ops {
204 /**
205 * read() - read from a block device
206 *
207 * @dev: Device to read from
208 * @start: Start block number to read (0=first)
209 * @blkcnt: Number of blocks to read
210 * @buffer: Destination buffer for data read
211 * @return number of blocks read, or -ve error number (see the
212 * IS_ERR_VALUE() macro
213 */
214 unsigned long (*read)(struct udevice *dev, lbaint_t start,
215 lbaint_t blkcnt, void *buffer);
216
217 /**
218 * write() - write to a block device
219 *
220 * @dev: Device to write to
221 * @start: Start block number to write (0=first)
222 * @blkcnt: Number of blocks to write
223 * @buffer: Source buffer for data to write
224 * @return number of blocks written, or -ve error number (see the
225 * IS_ERR_VALUE() macro
226 */
227 unsigned long (*write)(struct udevice *dev, lbaint_t start,
228 lbaint_t blkcnt, const void *buffer);
229
230 /**
231 * erase() - erase a section of a block device
232 *
233 * @dev: Device to (partially) erase
234 * @start: Start block number to erase (0=first)
235 * @blkcnt: Number of blocks to erase
236 * @return number of blocks erased, or -ve error number (see the
237 * IS_ERR_VALUE() macro
238 */
239 unsigned long (*erase)(struct udevice *dev, lbaint_t start,
240 lbaint_t blkcnt);
241
242 /**
243 * select_hwpart() - select a particular hardware partition
244 *
245 * Some devices (e.g. MMC) can support partitioning at the hardware
246 * level. This is quite separate from the normal idea of
247 * software-based partitions. MMC hardware partitions must be
248 * explicitly selected. Once selected only the region of the device
249 * covered by that partition is accessible.
250 *
251 * The MMC standard provides for two boot partitions (numbered 1 and 2),
252 * rpmb (3), and up to 4 addition general-purpose partitions (4-7).
253 *
254 * @dev: Block device to update
255 * @hwpart: Hardware partition number to select. 0 means the raw
256 * device, 1 is the first partition, 2 is the second, etc.
257 * @return 0 if OK, -ve on error
258 */
259 int (*select_hwpart)(struct udevice *dev, int hwpart);
260
261 #if IS_ENABLED(CONFIG_BOUNCE_BUFFER)
262 /**
263 * buffer_aligned() - test memory alignment of block operation buffer
264 *
265 * Some devices have limited DMA capabilities and require that the
266 * buffers passed to them fit specific properties. This optional
267 * callback can be used to indicate whether a buffer alignment is
268 * suitable for the device DMA or not, and trigger use of generic
269 * bounce buffer implementation to help use of unsuitable buffers
270 * at the expense of performance degradation.
271 *
272 * @dev: Block device associated with the request
273 * @state: Bounce buffer state
274 * @return 1 if OK, 0 if unaligned
275 */
276 int (*buffer_aligned)(struct udevice *dev, struct bounce_buffer *state);
277 #endif /* CONFIG_BOUNCE_BUFFER */
278 };
279
280 #if CONFIG_IS_ENABLED(BLK)
281
282 /*
283 * These functions should take struct udevice instead of struct blk_desc,
284 * but this is convenient for migration to driver model. Add a 'd' prefix
285 * to the function operations, so that blk_read(), etc. can be reserved for
286 * functions with the correct arguments.
287 */
288 unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start,
289 lbaint_t blkcnt, void *buffer);
290 unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
291 lbaint_t blkcnt, const void *buffer);
292 unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start,
293 lbaint_t blkcnt);
294
295 #endif /* BLK */
296
297 /**
298 * blk_read() - Read from a block device
299 *
300 * @dev: Device to read from
301 * @start: Start block for the read
302 * @blkcnt: Number of blocks to read
303 * @buf: Place to put the data
304 * @return number of blocks read (which may be less than @blkcnt),
305 * or -ve on error. This never returns 0 unless @blkcnt is 0
306 */
307 long blk_read(struct udevice *dev, lbaint_t start, lbaint_t blkcnt,
308 void *buffer);
309
310 /**
311 * blk_write() - Write to a block device
312 *
313 * @dev: Device to write to
314 * @start: Start block for the write
315 * @blkcnt: Number of blocks to write
316 * @buf: Data to write
317 * @return number of blocks written (which may be less than @blkcnt),
318 * or -ve on error. This never returns 0 unless @blkcnt is 0
319 */
320 long blk_write(struct udevice *dev, lbaint_t start, lbaint_t blkcnt,
321 const void *buffer);
322
323 /**
324 * blk_erase() - Erase part of a block device
325 *
326 * @dev: Device to erase
327 * @start: Start block for the erase
328 * @blkcnt: Number of blocks to erase
329 * @return number of blocks erased (which may be less than @blkcnt),
330 * or -ve on error. This never returns 0 unless @blkcnt is 0
331 */
332 long blk_erase(struct udevice *dev, lbaint_t start, lbaint_t blkcnt);
333
334 /**
335 * blk_find_device() - Find a block device
336 *
337 * This function does not activate the device. The device will be returned
338 * whether or not it is activated.
339 *
340 * @uclass_id: Interface type (enum uclass_id_t)
341 * @devnum: Device number (specific to each interface type)
342 * @devp: the device, if found
343 * Return: 0 if found, -ENODEV if no device found, or other -ve error value
344 */
345 int blk_find_device(int uclass_id, int devnum, struct udevice **devp);
346
347 /**
348 * blk_get_device() - Find and probe a block device ready for use
349 *
350 * @uclass_id: Interface type (enum uclass_id_t)
351 * @devnum: Device number (specific to each interface type)
352 * @devp: the device, if found
353 * Return: 0 if found, -ENODEV if no device found, or other -ve error value
354 */
355 int blk_get_device(int uclass_id, int devnum, struct udevice **devp);
356
357 /**
358 * blk_first_device() - Find the first device for a given interface
359 *
360 * The device is probed ready for use
361 *
362 * @devnum: Device number (specific to each interface type)
363 * @devp: the device, if found
364 * Return: 0 if found, -ENODEV if no device, or other -ve error value
365 */
366 int blk_first_device(int uclass_id, struct udevice **devp);
367
368 /**
369 * blk_next_device() - Find the next device for a given interface
370 *
371 * This can be called repeatedly after blk_first_device() to iterate through
372 * all devices of the given interface type.
373 *
374 * The device is probed ready for use
375 *
376 * @devp: On entry, the previous device returned. On exit, the next
377 * device, if found
378 * Return: 0 if found, -ENODEV if no device, or other -ve error value
379 */
380 int blk_next_device(struct udevice **devp);
381
382 /**
383 * blk_create_devicef() - Create a new named block device
384 *
385 * @parent: Parent of the new device
386 * @drv_name: Driver name to use for the block device
387 * @name: Name for the device (parent name is prepended)
388 * @uclass_id: Interface type (enum uclass_id_t)
389 * @devnum: Device number, specific to the interface type, or -1 to
390 * allocate the next available number
391 * @blksz: Block size of the device in bytes (typically 512)
392 * @lba: Total number of blocks of the device
393 * @devp: the new device (which has not been probed)
394 */
395 int blk_create_devicef(struct udevice *parent, const char *drv_name,
396 const char *name, int uclass_id, int devnum, int blksz,
397 lbaint_t lba, struct udevice **devp);
398
399 /**
400 * blk_probe_or_unbind() - Try to probe
401 *
402 * Try to probe the device, primarily for enumerating partitions.
403 * If it fails, the device itself is unbound since it means that it won't
404 * work any more.
405 *
406 * @dev: The device to probe
407 * Return: 0 if OK, -ve on error
408 */
409 int blk_probe_or_unbind(struct udevice *dev);
410
411 /**
412 * blk_unbind_all() - Unbind all device of the given interface type
413 *
414 * The devices are removed and then unbound.
415 *
416 * @uclass_id: Interface type to unbind
417 * Return: 0 if OK, -ve on error
418 */
419 int blk_unbind_all(int uclass_id);
420
421 /**
422 * blk_find_max_devnum() - find the maximum device number for an interface type
423 *
424 * Finds the last allocated device number for an interface type @uclass_id. The
425 * next number is safe to use for a newly allocated device.
426 *
427 * @uclass_id: Interface type to scan
428 * Return: maximum device number found, or -ENODEV if none, or other -ve on
429 * error
430 */
431 int blk_find_max_devnum(enum uclass_id uclass_id);
432
433 /**
434 * blk_next_free_devnum() - get the next device number for an interface type
435 *
436 * Finds the next number that is safe to use for a newly allocated device for
437 * an interface type @uclass_id.
438 *
439 * @uclass_id: Interface type to scan
440 * Return: next device number safe to use, or -ve on error
441 */
442 int blk_next_free_devnum(enum uclass_id uclass_id);
443
444 /**
445 * blk_select_hwpart() - select a hardware partition
446 *
447 * Select a hardware partition if the device supports it (typically MMC does)
448 *
449 * @dev: Device to update
450 * @hwpart: Partition number to select
451 * Return: 0 if OK, -ve on error
452 */
453 int blk_select_hwpart(struct udevice *dev, int hwpart);
454
455 /**
456 * blk_find_from_parent() - find a block device by looking up its parent
457 *
458 * All block devices have a parent 'media' device which provides the block
459 * driver for the block device, ensuring that access to the underlying medium
460 * is available.
461 *
462 * The block device is not activated by this function. See
463 * blk_get_from_parent() for that.
464 *
465 * @parent: Media device
466 * @devp: Returns the associated block device, if any
467 * Returns: 0 if OK, -ENODEV if @parent is not a media device and has no
468 * UCLASS_BLK child
469 */
470 int blk_find_from_parent(struct udevice *parent, struct udevice **devp);
471
472 /**
473 * blk_get_from_parent() - obtain a block device by looking up its parent
474 *
475 * All block devices have a parent 'media' device which provides the block
476 * driver for the block device, ensuring that access to the underlying medium
477 * is available.
478 *
479 * The block device is probed and ready for use.
480 *
481 * @parent: Media device
482 * @devp: Returns the associated block device, if any
483 * Returns: 0 if OK, -ENODEV if @parent is not a media device and has no
484 * UCLASS_BLK child
485 */
486 int blk_get_from_parent(struct udevice *parent, struct udevice **devp);
487
488 /**
489 * blk_get_devtype() - Get the device type of a block device
490 *
491 * @dev: Block device to check
492 * Return: device tree, i.e. the uclass name of its parent, e.g. "mmc"
493 */
494 const char *blk_get_devtype(struct udevice *dev);
495
496 /**
497 * blk_get_by_device() - Get the block device descriptor for the given device
498 * @dev: Instance of a storage device (the parent of the block device)
499 *
500 * Return: With block device descriptor on success , NULL if there is no such
501 * block device.
502 */
503 struct blk_desc *blk_get_by_device(struct udevice *dev);
504
505 /**
506 * blk_get_desc() - Get the block device descriptor for the given device number
507 *
508 * @uclass_id: Interface type
509 * @devnum: Device number (0 = first)
510 * @descp: Returns block device descriptor on success
511 * Return: 0 on success, -ENODEV if there is no such device and no device
512 * with a higher device number, -ENOENT if there is no such device but there
513 * is one with a higher number, or other -ve on other error.
514 */
515 int blk_get_desc(enum uclass_id uclass_id, int devnum, struct blk_desc **descp);
516
517 #if !CONFIG_IS_ENABLED(BLK)
518
519 #include <errno.h>
520
521 /*
522 * These functions should take struct udevice instead of struct blk_desc,
523 * but this is convenient for migration to driver model. Add a 'd' prefix
524 * to the function operations, so that blk_read(), etc. can be reserved for
525 * functions with the correct arguments.
526 */
blk_dread(struct blk_desc * block_dev,lbaint_t start,lbaint_t blkcnt,void * buffer)527 static inline ulong blk_dread(struct blk_desc *block_dev, lbaint_t start,
528 lbaint_t blkcnt, void *buffer)
529 {
530 ulong blks_read;
531 if (blkcache_read(block_dev->uclass_id, block_dev->devnum,
532 start, blkcnt, block_dev->blksz, buffer))
533 return blkcnt;
534
535 /*
536 * We could check if block_read is NULL and return -ENOSYS. But this
537 * bloats the code slightly (cause some board to fail to build), and
538 * it would be an error to try an operation that does not exist.
539 */
540 blks_read = block_dev->block_read(block_dev, start, blkcnt, buffer);
541 if (blks_read == blkcnt)
542 blkcache_fill(block_dev->uclass_id, block_dev->devnum,
543 start, blkcnt, block_dev->blksz, buffer);
544
545 return blks_read;
546 }
547
blk_dwrite(struct blk_desc * block_dev,lbaint_t start,lbaint_t blkcnt,const void * buffer)548 static inline ulong blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
549 lbaint_t blkcnt, const void *buffer)
550 {
551 blkcache_invalidate(block_dev->uclass_id, block_dev->devnum);
552 return block_dev->block_write(block_dev, start, blkcnt, buffer);
553 }
554
blk_derase(struct blk_desc * block_dev,lbaint_t start,lbaint_t blkcnt)555 static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start,
556 lbaint_t blkcnt)
557 {
558 blkcache_invalidate(block_dev->uclass_id, block_dev->devnum);
559 return block_dev->block_erase(block_dev, start, blkcnt);
560 }
561
562 /**
563 * struct blk_driver - Driver for block interface types
564 *
565 * This provides access to the block devices for each interface type. One
566 * driver should be provided using U_BOOT_LEGACY_BLK() for each interface
567 * type that is to be supported.
568 *
569 * @uclass_idname: Interface type name
570 * @uclass_id: Interface type
571 * @max_devs: Maximum number of devices supported
572 * @desc: Pointer to list of devices for this interface type,
573 * or NULL to use @get_dev() instead
574 */
575 struct blk_driver {
576 const char *uclass_idname;
577 enum uclass_id uclass_id;
578 int max_devs;
579 struct blk_desc *desc;
580 /**
581 * get_dev() - get a pointer to a block device given its number
582 *
583 * Each interface allocates its own devices and typically
584 * struct blk_desc is contained with the interface's data structure.
585 * There is no global numbering for block devices. This method allows
586 * the device for an interface type to be obtained when @desc is NULL.
587 *
588 * @devnum: Device number (0 for first device on that interface,
589 * 1 for second, etc.
590 * @descp: Returns pointer to the block device on success
591 * @return 0 if OK, -ve on error
592 */
593 int (*get_dev)(int devnum, struct blk_desc **descp);
594
595 /**
596 * select_hwpart() - Select a hardware partition
597 *
598 * Some devices (e.g. MMC) can support partitioning at the hardware
599 * level. This is quite separate from the normal idea of
600 * software-based partitions. MMC hardware partitions must be
601 * explicitly selected. Once selected only the region of the device
602 * covered by that partition is accessible.
603 *
604 * The MMC standard provides for two boot partitions (numbered 1 and 2),
605 * rpmb (3), and up to 4 addition general-purpose partitions (4-7).
606 * Partition 0 is the main user-data partition.
607 *
608 * @desc: Block device descriptor
609 * @hwpart: Hardware partition number to select. 0 means the main
610 * user-data partition, 1 is the first partition, 2 is
611 * the second, etc.
612 * @return 0 if OK, other value for an error
613 */
614 int (*select_hwpart)(struct blk_desc *desc, int hwpart);
615 };
616
617 /*
618 * Declare a new U-Boot legacy block driver. New drivers should use driver
619 * model (UCLASS_BLK).
620 */
621 #define U_BOOT_LEGACY_BLK(__name) \
622 ll_entry_declare(struct blk_driver, __name, blk_driver)
623
624 struct blk_driver *blk_driver_lookup_type(int uclass_id);
625
626 #endif /* !CONFIG_BLK */
627
628 /**
629 * blk_get_devnum_by_uclass_idname() - Get a block device by type and number
630 *
631 * This looks through the available block devices of the given type, returning
632 * the one with the given @devnum.
633 *
634 * @uclass_id: Block device type
635 * @devnum: Device number
636 * Return: point to block device descriptor, or NULL if not found
637 */
638 struct blk_desc *blk_get_devnum_by_uclass_id(enum uclass_id uclass_id, int devnum);
639
640 /**
641 * blk_get_devnum_by_uclass_idname() - Get block device by type name and number
642 *
643 * This looks up the block device type based on @uclass_idname, then calls
644 * blk_get_devnum_by_uclass_id().
645 *
646 * @uclass_idname: Block device type name
647 * @devnum: Device number
648 * Return: point to block device descriptor, or NULL if not found
649 */
650 struct blk_desc *blk_get_devnum_by_uclass_idname(const char *uclass_idname,
651 int devnum);
652
653 /**
654 * blk_dselect_hwpart() - select a hardware partition
655 *
656 * This selects a hardware partition (such as is supported by MMC). The block
657 * device size may change as this effectively points the block device to a
658 * partition at the hardware level. See the select_hwpart() method above.
659 *
660 * @desc: Block device descriptor for the device to select
661 * @hwpart: Partition number to select
662 * Return: 0 if OK, -ve on error
663 */
664 int blk_dselect_hwpart(struct blk_desc *desc, int hwpart);
665
666 /**
667 * blk_list_part() - list the partitions for block devices of a given type
668 *
669 * This looks up the partition type for each block device of type @uclass_id,
670 * then displays a list of partitions.
671 *
672 * @uclass_id: Block device type
673 * Return: 0 if OK, -ENODEV if there is none of that type
674 */
675 int blk_list_part(enum uclass_id uclass_id);
676
677 /**
678 * blk_list_devices() - list the block devices of a given type
679 *
680 * This lists each block device of the type @uclass_id, showing the capacity
681 * as well as type-specific information.
682 *
683 * @uclass_id: Block device type
684 */
685 void blk_list_devices(enum uclass_id uclass_id);
686
687 /**
688 * blk_show_device() - show information about a given block device
689 *
690 * This shows the block device capacity as well as type-specific information.
691 *
692 * @uclass_id: Block device type
693 * @devnum: Device number
694 * Return: 0 if OK, -ENODEV for invalid device number
695 */
696 int blk_show_device(enum uclass_id uclass_id, int devnum);
697
698 /**
699 * blk_print_device_num() - show information about a given block device
700 *
701 * This is similar to blk_show_device() but returns an error if the block
702 * device type is unknown.
703 *
704 * @uclass_id: Block device type
705 * @devnum: Device number
706 * Return: 0 if OK, -ENODEV for invalid device number, -ENOENT if the block
707 * device is not connected
708 */
709 int blk_print_device_num(enum uclass_id uclass_id, int devnum);
710
711 /**
712 * blk_print_part_devnum() - print the partition information for a device
713 *
714 * @uclass_id: Block device type
715 * @devnum: Device number
716 * Return: 0 if OK, -ENOENT if the block device is not connected, -ENOSYS if
717 * the interface type is not supported, other -ve on other error
718 */
719 int blk_print_part_devnum(enum uclass_id uclass_id, int devnum);
720
721 /**
722 * blk_select_hwpart_devnum() - select a hardware partition
723 *
724 * This is similar to blk_dselect_hwpart() but it looks up the interface and
725 * device number.
726 *
727 * @uclass_id: Block device type
728 * @devnum: Device number
729 * @hwpart: Partition number to select
730 * Return: 0 if OK, -ve on error
731 */
732 int blk_select_hwpart_devnum(enum uclass_id uclass_id, int devnum, int hwpart);
733
734 /**
735 * blk_get_uclass_name() - Get the name of an interface type
736 *
737 * @uclass_id: Interface type to check
738 * Return: name of interface, or NULL if none
739 */
740 const char *blk_get_uclass_name(enum uclass_id uclass_id);
741
742 /**
743 * blk_common_cmd() - handle common commands with block devices
744 *
745 * @args: Number of arguments to the command (argv[0] is the command itself)
746 * @argv: Command arguments
747 * @uclass_id: Interface type
748 * @cur_devnump: Current device number for this interface type
749 * Return: 0 if OK, CMD_RET_ERROR on error
750 */
751 int blk_common_cmd(int argc, char *const argv[], enum uclass_id uclass_id,
752 int *cur_devnump);
753
754 enum blk_flag_t {
755 BLKF_FIXED = 1 << 0,
756 BLKF_REMOVABLE = 1 << 1,
757 BLKF_BOTH = BLKF_FIXED | BLKF_REMOVABLE,
758 };
759
760 /**
761 * blk_first_device_err() - Get the first block device
762 *
763 * The device returned is probed if necessary, and ready for use
764 *
765 * @flags: Indicates type of device to return
766 * @devp: Returns pointer to the first device in that uclass, or NULL if none
767 * Return: 0 if found, -ENODEV if not found, other -ve on error
768 */
769 int blk_first_device_err(enum blk_flag_t flags, struct udevice **devp);
770
771 /**
772 * blk_next_device_err() - Get the next block device
773 *
774 * The device returned is probed if necessary, and ready for use
775 *
776 * @flags: Indicates type of device to return
777 * @devp: On entry, pointer to device to lookup. On exit, returns pointer
778 * to the next device in the uclass if no error occurred, or -ENODEV if
779 * there is no next device.
780 * Return: 0 if found, -ENODEV if not found, other -ve on error
781 */
782 int blk_next_device_err(enum blk_flag_t flags, struct udevice **devp);
783
784 /**
785 * blk_foreach_probe() - Helper function to iteration through block devices
786 *
787 * This creates a for() loop which works through the available devices in
788 * a uclass in order from start to end. Devices are probed if necessary,
789 * and ready for use.
790 *
791 * @flags: Indicates type of device to return
792 * @dev: struct udevice * to hold the current device. Set to NULL when there
793 * are no more devices.
794 */
795 #define blk_foreach_probe(flags, pos) \
796 for (int _ret = blk_first_device_err(flags, &(pos)); \
797 !_ret && pos; \
798 _ret = blk_next_device_err(flags, &(pos)))
799
800 /**
801 * blk_count_devices() - count the number of devices of a particular type
802 *
803 * @flags: Indicates type of device to find
804 * Return: number of devices matching those flags
805 */
806 int blk_count_devices(enum blk_flag_t flag);
807
808 #endif
809