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1a73661b SG |
1 | /* |
2 | * (C) Copyright 2000-2004 | |
3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
4 | * | |
5 | * SPDX-License-Identifier: GPL-2.0+ | |
6 | */ | |
7 | ||
8 | #ifndef BLK_H | |
9 | #define BLK_H | |
10 | ||
11 | #ifdef CONFIG_SYS_64BIT_LBA | |
12 | typedef uint64_t lbaint_t; | |
13 | #define LBAFlength "ll" | |
14 | #else | |
15 | typedef ulong lbaint_t; | |
16 | #define LBAFlength "l" | |
17 | #endif | |
18 | #define LBAF "%" LBAFlength "x" | |
19 | #define LBAFU "%" LBAFlength "u" | |
20 | ||
21 | /* Interface types: */ | |
5ec4f1a5 SG |
22 | enum if_type { |
23 | IF_TYPE_UNKNOWN = 0, | |
24 | IF_TYPE_IDE, | |
25 | IF_TYPE_SCSI, | |
26 | IF_TYPE_ATAPI, | |
27 | IF_TYPE_USB, | |
28 | IF_TYPE_DOC, | |
29 | IF_TYPE_MMC, | |
30 | IF_TYPE_SD, | |
31 | IF_TYPE_SATA, | |
32 | IF_TYPE_HOST, | |
3ef85e37 | 33 | IF_TYPE_SYSTEMACE, |
ffab6945 | 34 | IF_TYPE_NVME, |
5ec4f1a5 SG |
35 | |
36 | IF_TYPE_COUNT, /* Number of interface types */ | |
37 | }; | |
1a73661b | 38 | |
09d71aac SG |
39 | /* |
40 | * With driver model (CONFIG_BLK) this is uclass platform data, accessible | |
41 | * with dev_get_uclass_platdata(dev) | |
42 | */ | |
1a73661b | 43 | struct blk_desc { |
09d71aac SG |
44 | /* |
45 | * TODO: With driver model we should be able to use the parent | |
46 | * device's uclass instead. | |
47 | */ | |
5ec4f1a5 | 48 | enum if_type if_type; /* type of the interface */ |
bcce53d0 | 49 | int devnum; /* device number */ |
1a73661b SG |
50 | unsigned char part_type; /* partition type */ |
51 | unsigned char target; /* target SCSI ID */ | |
52 | unsigned char lun; /* target LUN */ | |
53 | unsigned char hwpart; /* HW partition, e.g. for eMMC */ | |
54 | unsigned char type; /* device type */ | |
55 | unsigned char removable; /* removable device */ | |
56 | #ifdef CONFIG_LBA48 | |
57 | /* device can use 48bit addr (ATA/ATAPI v7) */ | |
58 | unsigned char lba48; | |
59 | #endif | |
60 | lbaint_t lba; /* number of blocks */ | |
61 | unsigned long blksz; /* block size */ | |
62 | int log2blksz; /* for convenience: log2(blksz) */ | |
63 | char vendor[40+1]; /* IDE model, SCSI Vendor */ | |
64 | char product[20+1]; /* IDE Serial no, SCSI product */ | |
65 | char revision[8+1]; /* firmware revision */ | |
c4d660d4 | 66 | #if CONFIG_IS_ENABLED(BLK) |
b6694a33 SG |
67 | /* |
68 | * For now we have a few functions which take struct blk_desc as a | |
69 | * parameter. This field allows them to look up the associated | |
70 | * device. Once these functions are removed we can drop this field. | |
71 | */ | |
09d71aac SG |
72 | struct udevice *bdev; |
73 | #else | |
1a73661b SG |
74 | unsigned long (*block_read)(struct blk_desc *block_dev, |
75 | lbaint_t start, | |
76 | lbaint_t blkcnt, | |
77 | void *buffer); | |
78 | unsigned long (*block_write)(struct blk_desc *block_dev, | |
79 | lbaint_t start, | |
80 | lbaint_t blkcnt, | |
81 | const void *buffer); | |
82 | unsigned long (*block_erase)(struct blk_desc *block_dev, | |
83 | lbaint_t start, | |
84 | lbaint_t blkcnt); | |
85 | void *priv; /* driver private struct pointer */ | |
09d71aac | 86 | #endif |
1a73661b SG |
87 | }; |
88 | ||
89 | #define BLOCK_CNT(size, blk_desc) (PAD_COUNT(size, blk_desc->blksz)) | |
90 | #define PAD_TO_BLOCKSIZE(size, blk_desc) \ | |
91 | (PAD_SIZE(size, blk_desc->blksz)) | |
92 | ||
e40cf34a EN |
93 | #ifdef CONFIG_BLOCK_CACHE |
94 | /** | |
95 | * blkcache_read() - attempt to read a set of blocks from cache | |
96 | * | |
97 | * @param iftype - IF_TYPE_x for type of device | |
98 | * @param dev - device index of particular type | |
99 | * @param start - starting block number | |
100 | * @param blkcnt - number of blocks to read | |
101 | * @param blksz - size in bytes of each block | |
102 | * @param buf - buffer to contain cached data | |
103 | * | |
104 | * @return - '1' if block returned from cache, '0' otherwise. | |
105 | */ | |
c8e4d2a8 EN |
106 | int blkcache_read(int iftype, int dev, |
107 | lbaint_t start, lbaint_t blkcnt, | |
108 | unsigned long blksz, void *buffer); | |
e40cf34a EN |
109 | |
110 | /** | |
111 | * blkcache_fill() - make data read from a block device available | |
112 | * to the block cache | |
113 | * | |
114 | * @param iftype - IF_TYPE_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 available | |
118 | * @param blksz - size in bytes of each block | |
119 | * @param buf - buffer containing data to cache | |
120 | * | |
121 | */ | |
c8e4d2a8 EN |
122 | void blkcache_fill(int iftype, int dev, |
123 | lbaint_t start, lbaint_t blkcnt, | |
124 | unsigned long blksz, void const *buffer); | |
e40cf34a EN |
125 | |
126 | /** | |
127 | * blkcache_invalidate() - discard the cache for a set of blocks | |
128 | * because of a write or device (re)initialization. | |
129 | * | |
130 | * @param iftype - IF_TYPE_x for type of device | |
131 | * @param dev - device index of particular type | |
132 | */ | |
c8e4d2a8 | 133 | void blkcache_invalidate(int iftype, int dev); |
e40cf34a EN |
134 | |
135 | /** | |
136 | * blkcache_configure() - configure block cache | |
137 | * | |
138 | * @param blocks - maximum blocks per entry | |
139 | * @param entries - maximum entries in cache | |
140 | */ | |
141 | void blkcache_configure(unsigned blocks, unsigned entries); | |
142 | ||
143 | /* | |
144 | * statistics of the block cache | |
145 | */ | |
146 | struct block_cache_stats { | |
147 | unsigned hits; | |
148 | unsigned misses; | |
149 | unsigned entries; /* current entry count */ | |
150 | unsigned max_blocks_per_entry; | |
151 | unsigned max_entries; | |
152 | }; | |
153 | ||
154 | /** | |
155 | * get_blkcache_stats() - return statistics and reset | |
156 | * | |
157 | * @param stats - statistics are copied here | |
158 | */ | |
159 | void blkcache_stats(struct block_cache_stats *stats); | |
160 | ||
161 | #else | |
162 | ||
c8e4d2a8 EN |
163 | static inline int blkcache_read(int iftype, int dev, |
164 | lbaint_t start, lbaint_t blkcnt, | |
165 | unsigned long blksz, void *buffer) | |
e40cf34a EN |
166 | { |
167 | return 0; | |
168 | } | |
169 | ||
c8e4d2a8 EN |
170 | static inline void blkcache_fill(int iftype, int dev, |
171 | lbaint_t start, lbaint_t blkcnt, | |
172 | unsigned long blksz, void const *buffer) {} | |
e40cf34a | 173 | |
c8e4d2a8 | 174 | static inline void blkcache_invalidate(int iftype, int dev) {} |
e40cf34a EN |
175 | |
176 | #endif | |
177 | ||
c4d660d4 | 178 | #if CONFIG_IS_ENABLED(BLK) |
09d71aac SG |
179 | struct udevice; |
180 | ||
181 | /* Operations on block devices */ | |
182 | struct blk_ops { | |
183 | /** | |
184 | * read() - read from a block device | |
185 | * | |
186 | * @dev: Device to read from | |
187 | * @start: Start block number to read (0=first) | |
188 | * @blkcnt: Number of blocks to read | |
189 | * @buffer: Destination buffer for data read | |
190 | * @return number of blocks read, or -ve error number (see the | |
191 | * IS_ERR_VALUE() macro | |
192 | */ | |
193 | unsigned long (*read)(struct udevice *dev, lbaint_t start, | |
194 | lbaint_t blkcnt, void *buffer); | |
195 | ||
196 | /** | |
197 | * write() - write to a block device | |
198 | * | |
199 | * @dev: Device to write to | |
200 | * @start: Start block number to write (0=first) | |
201 | * @blkcnt: Number of blocks to write | |
202 | * @buffer: Source buffer for data to write | |
203 | * @return number of blocks written, or -ve error number (see the | |
204 | * IS_ERR_VALUE() macro | |
205 | */ | |
206 | unsigned long (*write)(struct udevice *dev, lbaint_t start, | |
207 | lbaint_t blkcnt, const void *buffer); | |
208 | ||
209 | /** | |
210 | * erase() - erase a section of a block device | |
211 | * | |
212 | * @dev: Device to (partially) erase | |
213 | * @start: Start block number to erase (0=first) | |
214 | * @blkcnt: Number of blocks to erase | |
215 | * @return number of blocks erased, or -ve error number (see the | |
216 | * IS_ERR_VALUE() macro | |
217 | */ | |
218 | unsigned long (*erase)(struct udevice *dev, lbaint_t start, | |
219 | lbaint_t blkcnt); | |
cd0fb55b SG |
220 | |
221 | /** | |
222 | * select_hwpart() - select a particular hardware partition | |
223 | * | |
224 | * Some devices (e.g. MMC) can support partitioning at the hardware | |
225 | * level. This is quite separate from the normal idea of | |
226 | * software-based partitions. MMC hardware partitions must be | |
227 | * explicitly selected. Once selected only the region of the device | |
228 | * covered by that partition is accessible. | |
229 | * | |
230 | * The MMC standard provides for two boot partitions (numbered 1 and 2), | |
231 | * rpmb (3), and up to 4 addition general-purpose partitions (4-7). | |
232 | * | |
233 | * @desc: Block device to update | |
234 | * @hwpart: Hardware partition number to select. 0 means the raw | |
235 | * device, 1 is the first partition, 2 is the second, etc. | |
236 | * @return 0 if OK, -ve on error | |
237 | */ | |
238 | int (*select_hwpart)(struct udevice *dev, int hwpart); | |
09d71aac SG |
239 | }; |
240 | ||
241 | #define blk_get_ops(dev) ((struct blk_ops *)(dev)->driver->ops) | |
242 | ||
243 | /* | |
244 | * These functions should take struct udevice instead of struct blk_desc, | |
245 | * but this is convenient for migration to driver model. Add a 'd' prefix | |
246 | * to the function operations, so that blk_read(), etc. can be reserved for | |
247 | * functions with the correct arguments. | |
248 | */ | |
249 | unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start, | |
250 | lbaint_t blkcnt, void *buffer); | |
251 | unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start, | |
252 | lbaint_t blkcnt, const void *buffer); | |
253 | unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start, | |
254 | lbaint_t blkcnt); | |
255 | ||
6139281a SG |
256 | /** |
257 | * blk_find_device() - Find a block device | |
258 | * | |
259 | * This function does not activate the device. The device will be returned | |
260 | * whether or not it is activated. | |
261 | * | |
262 | * @if_type: Interface type (enum if_type_t) | |
263 | * @devnum: Device number (specific to each interface type) | |
264 | * @devp: the device, if found | |
265 | * @return 0 if found, -ENODEV if no device found, or other -ve error value | |
266 | */ | |
267 | int blk_find_device(int if_type, int devnum, struct udevice **devp); | |
268 | ||
09d71aac SG |
269 | /** |
270 | * blk_get_device() - Find and probe a block device ready for use | |
271 | * | |
272 | * @if_type: Interface type (enum if_type_t) | |
273 | * @devnum: Device number (specific to each interface type) | |
274 | * @devp: the device, if found | |
6139281a | 275 | * @return 0 if found, -ENODEV if no device found, or other -ve error value |
09d71aac SG |
276 | */ |
277 | int blk_get_device(int if_type, int devnum, struct udevice **devp); | |
278 | ||
279 | /** | |
280 | * blk_first_device() - Find the first device for a given interface | |
281 | * | |
282 | * The device is probed ready for use | |
283 | * | |
284 | * @devnum: Device number (specific to each interface type) | |
285 | * @devp: the device, if found | |
286 | * @return 0 if found, -ENODEV if no device, or other -ve error value | |
287 | */ | |
288 | int blk_first_device(int if_type, struct udevice **devp); | |
289 | ||
290 | /** | |
291 | * blk_next_device() - Find the next device for a given interface | |
292 | * | |
293 | * This can be called repeatedly after blk_first_device() to iterate through | |
294 | * all devices of the given interface type. | |
295 | * | |
296 | * The device is probed ready for use | |
297 | * | |
298 | * @devp: On entry, the previous device returned. On exit, the next | |
299 | * device, if found | |
300 | * @return 0 if found, -ENODEV if no device, or other -ve error value | |
301 | */ | |
302 | int blk_next_device(struct udevice **devp); | |
303 | ||
304 | /** | |
305 | * blk_create_device() - Create a new block device | |
306 | * | |
307 | * @parent: Parent of the new device | |
308 | * @drv_name: Driver name to use for the block device | |
309 | * @name: Name for the device | |
310 | * @if_type: Interface type (enum if_type_t) | |
52138fd4 SG |
311 | * @devnum: Device number, specific to the interface type, or -1 to |
312 | * allocate the next available number | |
09d71aac SG |
313 | * @blksz: Block size of the device in bytes (typically 512) |
314 | * @size: Total size of the device in bytes | |
315 | * @devp: the new device (which has not been probed) | |
316 | */ | |
317 | int blk_create_device(struct udevice *parent, const char *drv_name, | |
318 | const char *name, int if_type, int devnum, int blksz, | |
319 | lbaint_t size, struct udevice **devp); | |
320 | ||
9107c973 SG |
321 | /** |
322 | * blk_create_devicef() - Create a new named block device | |
323 | * | |
324 | * @parent: Parent of the new device | |
325 | * @drv_name: Driver name to use for the block device | |
326 | * @name: Name for the device (parent name is prepended) | |
327 | * @if_type: Interface type (enum if_type_t) | |
328 | * @devnum: Device number, specific to the interface type, or -1 to | |
329 | * allocate the next available number | |
330 | * @blksz: Block size of the device in bytes (typically 512) | |
331 | * @size: Total size of the device in bytes | |
332 | * @devp: the new device (which has not been probed) | |
333 | */ | |
334 | int blk_create_devicef(struct udevice *parent, const char *drv_name, | |
335 | const char *name, int if_type, int devnum, int blksz, | |
336 | lbaint_t size, struct udevice **devp); | |
337 | ||
09d71aac SG |
338 | /** |
339 | * blk_prepare_device() - Prepare a block device for use | |
340 | * | |
341 | * This reads partition information from the device if supported. | |
342 | * | |
343 | * @dev: Device to prepare | |
344 | * @return 0 if ok, -ve on error | |
345 | */ | |
346 | int blk_prepare_device(struct udevice *dev); | |
347 | ||
348 | /** | |
349 | * blk_unbind_all() - Unbind all device of the given interface type | |
350 | * | |
351 | * The devices are removed and then unbound. | |
352 | * | |
353 | * @if_type: Interface type to unbind | |
354 | * @return 0 if OK, -ve on error | |
355 | */ | |
356 | int blk_unbind_all(int if_type); | |
357 | ||
52138fd4 SG |
358 | /** |
359 | * blk_find_max_devnum() - find the maximum device number for an interface type | |
360 | * | |
361 | * Finds the last allocated device number for an interface type @if_type. The | |
362 | * next number is safe to use for a newly allocated device. | |
363 | * | |
364 | * @if_type: Interface type to scan | |
365 | * @return maximum device number found, or -ENODEV if none, or other -ve on | |
366 | * error | |
367 | */ | |
368 | int blk_find_max_devnum(enum if_type if_type); | |
369 | ||
cd0fb55b SG |
370 | /** |
371 | * blk_select_hwpart() - select a hardware partition | |
372 | * | |
373 | * Select a hardware partition if the device supports it (typically MMC does) | |
374 | * | |
375 | * @dev: Device to update | |
376 | * @hwpart: Partition number to select | |
377 | * @return 0 if OK, -ve on error | |
378 | */ | |
379 | int blk_select_hwpart(struct udevice *dev, int hwpart); | |
380 | ||
4bdb49a7 TR |
381 | /** |
382 | * blk_get_from_parent() - obtain a block device by looking up its parent | |
383 | * | |
384 | * All devices with | |
385 | */ | |
386 | int blk_get_from_parent(struct udevice *parent, struct udevice **devp); | |
387 | ||
09d71aac SG |
388 | #else |
389 | #include <errno.h> | |
2a981dc2 SG |
390 | /* |
391 | * These functions should take struct udevice instead of struct blk_desc, | |
392 | * but this is convenient for migration to driver model. Add a 'd' prefix | |
393 | * to the function operations, so that blk_read(), etc. can be reserved for | |
394 | * functions with the correct arguments. | |
395 | */ | |
396 | static inline ulong blk_dread(struct blk_desc *block_dev, lbaint_t start, | |
397 | lbaint_t blkcnt, void *buffer) | |
398 | { | |
e40cf34a EN |
399 | ulong blks_read; |
400 | if (blkcache_read(block_dev->if_type, block_dev->devnum, | |
401 | start, blkcnt, block_dev->blksz, buffer)) | |
402 | return blkcnt; | |
403 | ||
2a981dc2 SG |
404 | /* |
405 | * We could check if block_read is NULL and return -ENOSYS. But this | |
406 | * bloats the code slightly (cause some board to fail to build), and | |
407 | * it would be an error to try an operation that does not exist. | |
408 | */ | |
e40cf34a EN |
409 | blks_read = block_dev->block_read(block_dev, start, blkcnt, buffer); |
410 | if (blks_read == blkcnt) | |
411 | blkcache_fill(block_dev->if_type, block_dev->devnum, | |
412 | start, blkcnt, block_dev->blksz, buffer); | |
413 | ||
414 | return blks_read; | |
2a981dc2 SG |
415 | } |
416 | ||
417 | static inline ulong blk_dwrite(struct blk_desc *block_dev, lbaint_t start, | |
418 | lbaint_t blkcnt, const void *buffer) | |
419 | { | |
e40cf34a | 420 | blkcache_invalidate(block_dev->if_type, block_dev->devnum); |
2a981dc2 SG |
421 | return block_dev->block_write(block_dev, start, blkcnt, buffer); |
422 | } | |
423 | ||
424 | static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start, | |
425 | lbaint_t blkcnt) | |
426 | { | |
e40cf34a | 427 | blkcache_invalidate(block_dev->if_type, block_dev->devnum); |
2a981dc2 SG |
428 | return block_dev->block_erase(block_dev, start, blkcnt); |
429 | } | |
6eef6eac SG |
430 | |
431 | /** | |
432 | * struct blk_driver - Driver for block interface types | |
433 | * | |
434 | * This provides access to the block devices for each interface type. One | |
435 | * driver should be provided using U_BOOT_LEGACY_BLK() for each interface | |
436 | * type that is to be supported. | |
437 | * | |
438 | * @if_typename: Interface type name | |
439 | * @if_type: Interface type | |
440 | * @max_devs: Maximum number of devices supported | |
441 | * @desc: Pointer to list of devices for this interface type, | |
442 | * or NULL to use @get_dev() instead | |
443 | */ | |
444 | struct blk_driver { | |
445 | const char *if_typename; | |
446 | enum if_type if_type; | |
447 | int max_devs; | |
448 | struct blk_desc *desc; | |
449 | /** | |
450 | * get_dev() - get a pointer to a block device given its number | |
451 | * | |
452 | * Each interface allocates its own devices and typically | |
453 | * struct blk_desc is contained with the interface's data structure. | |
454 | * There is no global numbering for block devices. This method allows | |
455 | * the device for an interface type to be obtained when @desc is NULL. | |
456 | * | |
457 | * @devnum: Device number (0 for first device on that interface, | |
458 | * 1 for second, etc. | |
459 | * @descp: Returns pointer to the block device on success | |
460 | * @return 0 if OK, -ve on error | |
461 | */ | |
462 | int (*get_dev)(int devnum, struct blk_desc **descp); | |
463 | ||
464 | /** | |
465 | * select_hwpart() - Select a hardware partition | |
466 | * | |
467 | * Some devices (e.g. MMC) can support partitioning at the hardware | |
468 | * level. This is quite separate from the normal idea of | |
469 | * software-based partitions. MMC hardware partitions must be | |
470 | * explicitly selected. Once selected only the region of the device | |
471 | * covered by that partition is accessible. | |
472 | * | |
473 | * The MMC standard provides for two boot partitions (numbered 1 and 2), | |
474 | * rpmb (3), and up to 4 addition general-purpose partitions (4-7). | |
475 | * Partition 0 is the main user-data partition. | |
476 | * | |
477 | * @desc: Block device descriptor | |
478 | * @hwpart: Hardware partition number to select. 0 means the main | |
479 | * user-data partition, 1 is the first partition, 2 is | |
480 | * the second, etc. | |
481 | * @return 0 if OK, other value for an error | |
482 | */ | |
483 | int (*select_hwpart)(struct blk_desc *desc, int hwpart); | |
484 | }; | |
485 | ||
486 | /* | |
487 | * Declare a new U-Boot legacy block driver. New drivers should use driver | |
488 | * model (UCLASS_BLK). | |
489 | */ | |
490 | #define U_BOOT_LEGACY_BLK(__name) \ | |
491 | ll_entry_declare(struct blk_driver, __name, blk_driver) | |
492 | ||
493 | struct blk_driver *blk_driver_lookup_type(int if_type); | |
494 | ||
09d71aac | 495 | #endif /* !CONFIG_BLK */ |
2a981dc2 | 496 | |
6eef6eac SG |
497 | /** |
498 | * blk_get_devnum_by_typename() - Get a block device by type and number | |
499 | * | |
500 | * This looks through the available block devices of the given type, returning | |
501 | * the one with the given @devnum. | |
502 | * | |
503 | * @if_type: Block device type | |
504 | * @devnum: Device number | |
505 | * @return point to block device descriptor, or NULL if not found | |
506 | */ | |
507 | struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum); | |
508 | ||
509 | /** | |
510 | * blk_get_devnum_by_type() - Get a block device by type name, and number | |
511 | * | |
512 | * This looks up the block device type based on @if_typename, then calls | |
513 | * blk_get_devnum_by_type(). | |
514 | * | |
515 | * @if_typename: Block device type name | |
516 | * @devnum: Device number | |
517 | * @return point to block device descriptor, or NULL if not found | |
518 | */ | |
519 | struct blk_desc *blk_get_devnum_by_typename(const char *if_typename, | |
520 | int devnum); | |
521 | ||
522 | /** | |
523 | * blk_dselect_hwpart() - select a hardware partition | |
524 | * | |
525 | * This selects a hardware partition (such as is supported by MMC). The block | |
526 | * device size may change as this effectively points the block device to a | |
527 | * partition at the hardware level. See the select_hwpart() method above. | |
528 | * | |
529 | * @desc: Block device descriptor for the device to select | |
530 | * @hwpart: Partition number to select | |
531 | * @return 0 if OK, -ve on error | |
532 | */ | |
533 | int blk_dselect_hwpart(struct blk_desc *desc, int hwpart); | |
534 | ||
535 | /** | |
536 | * blk_list_part() - list the partitions for block devices of a given type | |
537 | * | |
538 | * This looks up the partition type for each block device of type @if_type, | |
539 | * then displays a list of partitions. | |
540 | * | |
541 | * @if_type: Block device type | |
542 | * @return 0 if OK, -ENODEV if there is none of that type | |
543 | */ | |
544 | int blk_list_part(enum if_type if_type); | |
545 | ||
546 | /** | |
547 | * blk_list_devices() - list the block devices of a given type | |
548 | * | |
549 | * This lists each block device of the type @if_type, showing the capacity | |
550 | * as well as type-specific information. | |
551 | * | |
552 | * @if_type: Block device type | |
553 | */ | |
554 | void blk_list_devices(enum if_type if_type); | |
555 | ||
556 | /** | |
557 | * blk_show_device() - show information about a given block device | |
558 | * | |
559 | * This shows the block device capacity as well as type-specific information. | |
560 | * | |
561 | * @if_type: Block device type | |
562 | * @devnum: Device number | |
563 | * @return 0 if OK, -ENODEV for invalid device number | |
564 | */ | |
565 | int blk_show_device(enum if_type if_type, int devnum); | |
566 | ||
567 | /** | |
568 | * blk_print_device_num() - show information about a given block device | |
569 | * | |
570 | * This is similar to blk_show_device() but returns an error if the block | |
571 | * device type is unknown. | |
572 | * | |
573 | * @if_type: Block device type | |
574 | * @devnum: Device number | |
575 | * @return 0 if OK, -ENODEV for invalid device number, -ENOENT if the block | |
576 | * device is not connected | |
577 | */ | |
578 | int blk_print_device_num(enum if_type if_type, int devnum); | |
579 | ||
580 | /** | |
581 | * blk_print_part_devnum() - print the partition information for a device | |
582 | * | |
583 | * @if_type: Block device type | |
584 | * @devnum: Device number | |
585 | * @return 0 if OK, -ENOENT if the block device is not connected, -ENOSYS if | |
586 | * the interface type is not supported, other -ve on other error | |
587 | */ | |
588 | int blk_print_part_devnum(enum if_type if_type, int devnum); | |
589 | ||
590 | /** | |
591 | * blk_read_devnum() - read blocks from a device | |
592 | * | |
593 | * @if_type: Block device type | |
594 | * @devnum: Device number | |
595 | * @blkcnt: Number of blocks to read | |
596 | * @buffer: Address to write data to | |
597 | * @return number of blocks read, or -ve error number on error | |
598 | */ | |
599 | ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start, | |
600 | lbaint_t blkcnt, void *buffer); | |
601 | ||
602 | /** | |
603 | * blk_write_devnum() - write blocks to a device | |
604 | * | |
605 | * @if_type: Block device type | |
606 | * @devnum: Device number | |
607 | * @blkcnt: Number of blocks to write | |
608 | * @buffer: Address to read data from | |
609 | * @return number of blocks written, or -ve error number on error | |
610 | */ | |
611 | ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start, | |
612 | lbaint_t blkcnt, const void *buffer); | |
613 | ||
614 | /** | |
615 | * blk_select_hwpart_devnum() - select a hardware partition | |
616 | * | |
617 | * This is similar to blk_dselect_hwpart() but it looks up the interface and | |
618 | * device number. | |
619 | * | |
620 | * @if_type: Block device type | |
621 | * @devnum: Device number | |
622 | * @hwpart: Partition number to select | |
623 | * @return 0 if OK, -ve on error | |
624 | */ | |
625 | int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart); | |
626 | ||
1a73661b | 627 | #endif |