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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, |
5ec4f1a5 SG |
34 | |
35 | IF_TYPE_COUNT, /* Number of interface types */ | |
36 | }; | |
1a73661b | 37 | |
09d71aac SG |
38 | /* |
39 | * With driver model (CONFIG_BLK) this is uclass platform data, accessible | |
40 | * with dev_get_uclass_platdata(dev) | |
41 | */ | |
1a73661b | 42 | struct blk_desc { |
09d71aac SG |
43 | /* |
44 | * TODO: With driver model we should be able to use the parent | |
45 | * device's uclass instead. | |
46 | */ | |
5ec4f1a5 | 47 | enum if_type if_type; /* type of the interface */ |
bcce53d0 | 48 | int devnum; /* device number */ |
1a73661b SG |
49 | unsigned char part_type; /* partition type */ |
50 | unsigned char target; /* target SCSI ID */ | |
51 | unsigned char lun; /* target LUN */ | |
52 | unsigned char hwpart; /* HW partition, e.g. for eMMC */ | |
53 | unsigned char type; /* device type */ | |
54 | unsigned char removable; /* removable device */ | |
55 | #ifdef CONFIG_LBA48 | |
56 | /* device can use 48bit addr (ATA/ATAPI v7) */ | |
57 | unsigned char lba48; | |
58 | #endif | |
59 | lbaint_t lba; /* number of blocks */ | |
60 | unsigned long blksz; /* block size */ | |
61 | int log2blksz; /* for convenience: log2(blksz) */ | |
62 | char vendor[40+1]; /* IDE model, SCSI Vendor */ | |
63 | char product[20+1]; /* IDE Serial no, SCSI product */ | |
64 | char revision[8+1]; /* firmware revision */ | |
09d71aac SG |
65 | #ifdef CONFIG_BLK |
66 | struct udevice *bdev; | |
67 | #else | |
1a73661b SG |
68 | unsigned long (*block_read)(struct blk_desc *block_dev, |
69 | lbaint_t start, | |
70 | lbaint_t blkcnt, | |
71 | void *buffer); | |
72 | unsigned long (*block_write)(struct blk_desc *block_dev, | |
73 | lbaint_t start, | |
74 | lbaint_t blkcnt, | |
75 | const void *buffer); | |
76 | unsigned long (*block_erase)(struct blk_desc *block_dev, | |
77 | lbaint_t start, | |
78 | lbaint_t blkcnt); | |
79 | void *priv; /* driver private struct pointer */ | |
09d71aac | 80 | #endif |
1a73661b SG |
81 | }; |
82 | ||
83 | #define BLOCK_CNT(size, blk_desc) (PAD_COUNT(size, blk_desc->blksz)) | |
84 | #define PAD_TO_BLOCKSIZE(size, blk_desc) \ | |
85 | (PAD_SIZE(size, blk_desc->blksz)) | |
86 | ||
e40cf34a EN |
87 | #ifdef CONFIG_BLOCK_CACHE |
88 | /** | |
89 | * blkcache_read() - attempt to read a set of blocks from cache | |
90 | * | |
91 | * @param iftype - IF_TYPE_x for type of device | |
92 | * @param dev - device index of particular type | |
93 | * @param start - starting block number | |
94 | * @param blkcnt - number of blocks to read | |
95 | * @param blksz - size in bytes of each block | |
96 | * @param buf - buffer to contain cached data | |
97 | * | |
98 | * @return - '1' if block returned from cache, '0' otherwise. | |
99 | */ | |
c8e4d2a8 EN |
100 | int blkcache_read(int iftype, int dev, |
101 | lbaint_t start, lbaint_t blkcnt, | |
102 | unsigned long blksz, void *buffer); | |
e40cf34a EN |
103 | |
104 | /** | |
105 | * blkcache_fill() - make data read from a block device available | |
106 | * to the block cache | |
107 | * | |
108 | * @param iftype - IF_TYPE_x for type of device | |
109 | * @param dev - device index of particular type | |
110 | * @param start - starting block number | |
111 | * @param blkcnt - number of blocks available | |
112 | * @param blksz - size in bytes of each block | |
113 | * @param buf - buffer containing data to cache | |
114 | * | |
115 | */ | |
c8e4d2a8 EN |
116 | void blkcache_fill(int iftype, int dev, |
117 | lbaint_t start, lbaint_t blkcnt, | |
118 | unsigned long blksz, void const *buffer); | |
e40cf34a EN |
119 | |
120 | /** | |
121 | * blkcache_invalidate() - discard the cache for a set of blocks | |
122 | * because of a write or device (re)initialization. | |
123 | * | |
124 | * @param iftype - IF_TYPE_x for type of device | |
125 | * @param dev - device index of particular type | |
126 | */ | |
c8e4d2a8 | 127 | void blkcache_invalidate(int iftype, int dev); |
e40cf34a EN |
128 | |
129 | /** | |
130 | * blkcache_configure() - configure block cache | |
131 | * | |
132 | * @param blocks - maximum blocks per entry | |
133 | * @param entries - maximum entries in cache | |
134 | */ | |
135 | void blkcache_configure(unsigned blocks, unsigned entries); | |
136 | ||
137 | /* | |
138 | * statistics of the block cache | |
139 | */ | |
140 | struct block_cache_stats { | |
141 | unsigned hits; | |
142 | unsigned misses; | |
143 | unsigned entries; /* current entry count */ | |
144 | unsigned max_blocks_per_entry; | |
145 | unsigned max_entries; | |
146 | }; | |
147 | ||
148 | /** | |
149 | * get_blkcache_stats() - return statistics and reset | |
150 | * | |
151 | * @param stats - statistics are copied here | |
152 | */ | |
153 | void blkcache_stats(struct block_cache_stats *stats); | |
154 | ||
155 | #else | |
156 | ||
c8e4d2a8 EN |
157 | static inline int blkcache_read(int iftype, int dev, |
158 | lbaint_t start, lbaint_t blkcnt, | |
159 | unsigned long blksz, void *buffer) | |
e40cf34a EN |
160 | { |
161 | return 0; | |
162 | } | |
163 | ||
c8e4d2a8 EN |
164 | static inline void blkcache_fill(int iftype, int dev, |
165 | lbaint_t start, lbaint_t blkcnt, | |
166 | unsigned long blksz, void const *buffer) {} | |
e40cf34a | 167 | |
c8e4d2a8 | 168 | static inline void blkcache_invalidate(int iftype, int dev) {} |
e40cf34a EN |
169 | |
170 | #endif | |
171 | ||
09d71aac SG |
172 | #ifdef CONFIG_BLK |
173 | struct udevice; | |
174 | ||
175 | /* Operations on block devices */ | |
176 | struct blk_ops { | |
177 | /** | |
178 | * read() - read from a block device | |
179 | * | |
180 | * @dev: Device to read from | |
181 | * @start: Start block number to read (0=first) | |
182 | * @blkcnt: Number of blocks to read | |
183 | * @buffer: Destination buffer for data read | |
184 | * @return number of blocks read, or -ve error number (see the | |
185 | * IS_ERR_VALUE() macro | |
186 | */ | |
187 | unsigned long (*read)(struct udevice *dev, lbaint_t start, | |
188 | lbaint_t blkcnt, void *buffer); | |
189 | ||
190 | /** | |
191 | * write() - write to a block device | |
192 | * | |
193 | * @dev: Device to write to | |
194 | * @start: Start block number to write (0=first) | |
195 | * @blkcnt: Number of blocks to write | |
196 | * @buffer: Source buffer for data to write | |
197 | * @return number of blocks written, or -ve error number (see the | |
198 | * IS_ERR_VALUE() macro | |
199 | */ | |
200 | unsigned long (*write)(struct udevice *dev, lbaint_t start, | |
201 | lbaint_t blkcnt, const void *buffer); | |
202 | ||
203 | /** | |
204 | * erase() - erase a section of a block device | |
205 | * | |
206 | * @dev: Device to (partially) erase | |
207 | * @start: Start block number to erase (0=first) | |
208 | * @blkcnt: Number of blocks to erase | |
209 | * @return number of blocks erased, or -ve error number (see the | |
210 | * IS_ERR_VALUE() macro | |
211 | */ | |
212 | unsigned long (*erase)(struct udevice *dev, lbaint_t start, | |
213 | lbaint_t blkcnt); | |
214 | }; | |
215 | ||
216 | #define blk_get_ops(dev) ((struct blk_ops *)(dev)->driver->ops) | |
217 | ||
218 | /* | |
219 | * These functions should take struct udevice instead of struct blk_desc, | |
220 | * but this is convenient for migration to driver model. Add a 'd' prefix | |
221 | * to the function operations, so that blk_read(), etc. can be reserved for | |
222 | * functions with the correct arguments. | |
223 | */ | |
224 | unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start, | |
225 | lbaint_t blkcnt, void *buffer); | |
226 | unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start, | |
227 | lbaint_t blkcnt, const void *buffer); | |
228 | unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start, | |
229 | lbaint_t blkcnt); | |
230 | ||
231 | /** | |
232 | * blk_get_device() - Find and probe a block device ready for use | |
233 | * | |
234 | * @if_type: Interface type (enum if_type_t) | |
235 | * @devnum: Device number (specific to each interface type) | |
236 | * @devp: the device, if found | |
237 | * @return - if found, -ENODEV if no device found, or other -ve error value | |
238 | */ | |
239 | int blk_get_device(int if_type, int devnum, struct udevice **devp); | |
240 | ||
241 | /** | |
242 | * blk_first_device() - Find the first device for a given interface | |
243 | * | |
244 | * The device is probed ready for use | |
245 | * | |
246 | * @devnum: Device number (specific to each interface type) | |
247 | * @devp: the device, if found | |
248 | * @return 0 if found, -ENODEV if no device, or other -ve error value | |
249 | */ | |
250 | int blk_first_device(int if_type, struct udevice **devp); | |
251 | ||
252 | /** | |
253 | * blk_next_device() - Find the next device for a given interface | |
254 | * | |
255 | * This can be called repeatedly after blk_first_device() to iterate through | |
256 | * all devices of the given interface type. | |
257 | * | |
258 | * The device is probed ready for use | |
259 | * | |
260 | * @devp: On entry, the previous device returned. On exit, the next | |
261 | * device, if found | |
262 | * @return 0 if found, -ENODEV if no device, or other -ve error value | |
263 | */ | |
264 | int blk_next_device(struct udevice **devp); | |
265 | ||
266 | /** | |
267 | * blk_create_device() - Create a new block device | |
268 | * | |
269 | * @parent: Parent of the new device | |
270 | * @drv_name: Driver name to use for the block device | |
271 | * @name: Name for the device | |
272 | * @if_type: Interface type (enum if_type_t) | |
52138fd4 SG |
273 | * @devnum: Device number, specific to the interface type, or -1 to |
274 | * allocate the next available number | |
09d71aac SG |
275 | * @blksz: Block size of the device in bytes (typically 512) |
276 | * @size: Total size of the device in bytes | |
277 | * @devp: the new device (which has not been probed) | |
278 | */ | |
279 | int blk_create_device(struct udevice *parent, const char *drv_name, | |
280 | const char *name, int if_type, int devnum, int blksz, | |
281 | lbaint_t size, struct udevice **devp); | |
282 | ||
9107c973 SG |
283 | /** |
284 | * blk_create_devicef() - Create a new named block device | |
285 | * | |
286 | * @parent: Parent of the new device | |
287 | * @drv_name: Driver name to use for the block device | |
288 | * @name: Name for the device (parent name is prepended) | |
289 | * @if_type: Interface type (enum if_type_t) | |
290 | * @devnum: Device number, specific to the interface type, or -1 to | |
291 | * allocate the next available number | |
292 | * @blksz: Block size of the device in bytes (typically 512) | |
293 | * @size: Total size of the device in bytes | |
294 | * @devp: the new device (which has not been probed) | |
295 | */ | |
296 | int blk_create_devicef(struct udevice *parent, const char *drv_name, | |
297 | const char *name, int if_type, int devnum, int blksz, | |
298 | lbaint_t size, struct udevice **devp); | |
299 | ||
09d71aac SG |
300 | /** |
301 | * blk_prepare_device() - Prepare a block device for use | |
302 | * | |
303 | * This reads partition information from the device if supported. | |
304 | * | |
305 | * @dev: Device to prepare | |
306 | * @return 0 if ok, -ve on error | |
307 | */ | |
308 | int blk_prepare_device(struct udevice *dev); | |
309 | ||
310 | /** | |
311 | * blk_unbind_all() - Unbind all device of the given interface type | |
312 | * | |
313 | * The devices are removed and then unbound. | |
314 | * | |
315 | * @if_type: Interface type to unbind | |
316 | * @return 0 if OK, -ve on error | |
317 | */ | |
318 | int blk_unbind_all(int if_type); | |
319 | ||
52138fd4 SG |
320 | /** |
321 | * blk_find_max_devnum() - find the maximum device number for an interface type | |
322 | * | |
323 | * Finds the last allocated device number for an interface type @if_type. The | |
324 | * next number is safe to use for a newly allocated device. | |
325 | * | |
326 | * @if_type: Interface type to scan | |
327 | * @return maximum device number found, or -ENODEV if none, or other -ve on | |
328 | * error | |
329 | */ | |
330 | int blk_find_max_devnum(enum if_type if_type); | |
331 | ||
09d71aac SG |
332 | #else |
333 | #include <errno.h> | |
2a981dc2 SG |
334 | /* |
335 | * These functions should take struct udevice instead of struct blk_desc, | |
336 | * but this is convenient for migration to driver model. Add a 'd' prefix | |
337 | * to the function operations, so that blk_read(), etc. can be reserved for | |
338 | * functions with the correct arguments. | |
339 | */ | |
340 | static inline ulong blk_dread(struct blk_desc *block_dev, lbaint_t start, | |
341 | lbaint_t blkcnt, void *buffer) | |
342 | { | |
e40cf34a EN |
343 | ulong blks_read; |
344 | if (blkcache_read(block_dev->if_type, block_dev->devnum, | |
345 | start, blkcnt, block_dev->blksz, buffer)) | |
346 | return blkcnt; | |
347 | ||
2a981dc2 SG |
348 | /* |
349 | * We could check if block_read is NULL and return -ENOSYS. But this | |
350 | * bloats the code slightly (cause some board to fail to build), and | |
351 | * it would be an error to try an operation that does not exist. | |
352 | */ | |
e40cf34a EN |
353 | blks_read = block_dev->block_read(block_dev, start, blkcnt, buffer); |
354 | if (blks_read == blkcnt) | |
355 | blkcache_fill(block_dev->if_type, block_dev->devnum, | |
356 | start, blkcnt, block_dev->blksz, buffer); | |
357 | ||
358 | return blks_read; | |
2a981dc2 SG |
359 | } |
360 | ||
361 | static inline ulong blk_dwrite(struct blk_desc *block_dev, lbaint_t start, | |
362 | lbaint_t blkcnt, const void *buffer) | |
363 | { | |
e40cf34a | 364 | blkcache_invalidate(block_dev->if_type, block_dev->devnum); |
2a981dc2 SG |
365 | return block_dev->block_write(block_dev, start, blkcnt, buffer); |
366 | } | |
367 | ||
368 | static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start, | |
369 | lbaint_t blkcnt) | |
370 | { | |
e40cf34a | 371 | blkcache_invalidate(block_dev->if_type, block_dev->devnum); |
2a981dc2 SG |
372 | return block_dev->block_erase(block_dev, start, blkcnt); |
373 | } | |
6eef6eac SG |
374 | |
375 | /** | |
376 | * struct blk_driver - Driver for block interface types | |
377 | * | |
378 | * This provides access to the block devices for each interface type. One | |
379 | * driver should be provided using U_BOOT_LEGACY_BLK() for each interface | |
380 | * type that is to be supported. | |
381 | * | |
382 | * @if_typename: Interface type name | |
383 | * @if_type: Interface type | |
384 | * @max_devs: Maximum number of devices supported | |
385 | * @desc: Pointer to list of devices for this interface type, | |
386 | * or NULL to use @get_dev() instead | |
387 | */ | |
388 | struct blk_driver { | |
389 | const char *if_typename; | |
390 | enum if_type if_type; | |
391 | int max_devs; | |
392 | struct blk_desc *desc; | |
393 | /** | |
394 | * get_dev() - get a pointer to a block device given its number | |
395 | * | |
396 | * Each interface allocates its own devices and typically | |
397 | * struct blk_desc is contained with the interface's data structure. | |
398 | * There is no global numbering for block devices. This method allows | |
399 | * the device for an interface type to be obtained when @desc is NULL. | |
400 | * | |
401 | * @devnum: Device number (0 for first device on that interface, | |
402 | * 1 for second, etc. | |
403 | * @descp: Returns pointer to the block device on success | |
404 | * @return 0 if OK, -ve on error | |
405 | */ | |
406 | int (*get_dev)(int devnum, struct blk_desc **descp); | |
407 | ||
408 | /** | |
409 | * select_hwpart() - Select a hardware partition | |
410 | * | |
411 | * Some devices (e.g. MMC) can support partitioning at the hardware | |
412 | * level. This is quite separate from the normal idea of | |
413 | * software-based partitions. MMC hardware partitions must be | |
414 | * explicitly selected. Once selected only the region of the device | |
415 | * covered by that partition is accessible. | |
416 | * | |
417 | * The MMC standard provides for two boot partitions (numbered 1 and 2), | |
418 | * rpmb (3), and up to 4 addition general-purpose partitions (4-7). | |
419 | * Partition 0 is the main user-data partition. | |
420 | * | |
421 | * @desc: Block device descriptor | |
422 | * @hwpart: Hardware partition number to select. 0 means the main | |
423 | * user-data partition, 1 is the first partition, 2 is | |
424 | * the second, etc. | |
425 | * @return 0 if OK, other value for an error | |
426 | */ | |
427 | int (*select_hwpart)(struct blk_desc *desc, int hwpart); | |
428 | }; | |
429 | ||
430 | /* | |
431 | * Declare a new U-Boot legacy block driver. New drivers should use driver | |
432 | * model (UCLASS_BLK). | |
433 | */ | |
434 | #define U_BOOT_LEGACY_BLK(__name) \ | |
435 | ll_entry_declare(struct blk_driver, __name, blk_driver) | |
436 | ||
437 | struct blk_driver *blk_driver_lookup_type(int if_type); | |
438 | ||
09d71aac | 439 | #endif /* !CONFIG_BLK */ |
2a981dc2 | 440 | |
6eef6eac SG |
441 | /** |
442 | * blk_get_devnum_by_typename() - Get a block device by type and number | |
443 | * | |
444 | * This looks through the available block devices of the given type, returning | |
445 | * the one with the given @devnum. | |
446 | * | |
447 | * @if_type: Block device type | |
448 | * @devnum: Device number | |
449 | * @return point to block device descriptor, or NULL if not found | |
450 | */ | |
451 | struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum); | |
452 | ||
453 | /** | |
454 | * blk_get_devnum_by_type() - Get a block device by type name, and number | |
455 | * | |
456 | * This looks up the block device type based on @if_typename, then calls | |
457 | * blk_get_devnum_by_type(). | |
458 | * | |
459 | * @if_typename: Block device type name | |
460 | * @devnum: Device number | |
461 | * @return point to block device descriptor, or NULL if not found | |
462 | */ | |
463 | struct blk_desc *blk_get_devnum_by_typename(const char *if_typename, | |
464 | int devnum); | |
465 | ||
466 | /** | |
467 | * blk_dselect_hwpart() - select a hardware partition | |
468 | * | |
469 | * This selects a hardware partition (such as is supported by MMC). The block | |
470 | * device size may change as this effectively points the block device to a | |
471 | * partition at the hardware level. See the select_hwpart() method above. | |
472 | * | |
473 | * @desc: Block device descriptor for the device to select | |
474 | * @hwpart: Partition number to select | |
475 | * @return 0 if OK, -ve on error | |
476 | */ | |
477 | int blk_dselect_hwpart(struct blk_desc *desc, int hwpart); | |
478 | ||
479 | /** | |
480 | * blk_list_part() - list the partitions for block devices of a given type | |
481 | * | |
482 | * This looks up the partition type for each block device of type @if_type, | |
483 | * then displays a list of partitions. | |
484 | * | |
485 | * @if_type: Block device type | |
486 | * @return 0 if OK, -ENODEV if there is none of that type | |
487 | */ | |
488 | int blk_list_part(enum if_type if_type); | |
489 | ||
490 | /** | |
491 | * blk_list_devices() - list the block devices of a given type | |
492 | * | |
493 | * This lists each block device of the type @if_type, showing the capacity | |
494 | * as well as type-specific information. | |
495 | * | |
496 | * @if_type: Block device type | |
497 | */ | |
498 | void blk_list_devices(enum if_type if_type); | |
499 | ||
500 | /** | |
501 | * blk_show_device() - show information about a given block device | |
502 | * | |
503 | * This shows the block device capacity as well as type-specific information. | |
504 | * | |
505 | * @if_type: Block device type | |
506 | * @devnum: Device number | |
507 | * @return 0 if OK, -ENODEV for invalid device number | |
508 | */ | |
509 | int blk_show_device(enum if_type if_type, int devnum); | |
510 | ||
511 | /** | |
512 | * blk_print_device_num() - show information about a given block device | |
513 | * | |
514 | * This is similar to blk_show_device() but returns an error if the block | |
515 | * device type is unknown. | |
516 | * | |
517 | * @if_type: Block device type | |
518 | * @devnum: Device number | |
519 | * @return 0 if OK, -ENODEV for invalid device number, -ENOENT if the block | |
520 | * device is not connected | |
521 | */ | |
522 | int blk_print_device_num(enum if_type if_type, int devnum); | |
523 | ||
524 | /** | |
525 | * blk_print_part_devnum() - print the partition information for a device | |
526 | * | |
527 | * @if_type: Block device type | |
528 | * @devnum: Device number | |
529 | * @return 0 if OK, -ENOENT if the block device is not connected, -ENOSYS if | |
530 | * the interface type is not supported, other -ve on other error | |
531 | */ | |
532 | int blk_print_part_devnum(enum if_type if_type, int devnum); | |
533 | ||
534 | /** | |
535 | * blk_read_devnum() - read blocks from a device | |
536 | * | |
537 | * @if_type: Block device type | |
538 | * @devnum: Device number | |
539 | * @blkcnt: Number of blocks to read | |
540 | * @buffer: Address to write data to | |
541 | * @return number of blocks read, or -ve error number on error | |
542 | */ | |
543 | ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start, | |
544 | lbaint_t blkcnt, void *buffer); | |
545 | ||
546 | /** | |
547 | * blk_write_devnum() - write blocks to a device | |
548 | * | |
549 | * @if_type: Block device type | |
550 | * @devnum: Device number | |
551 | * @blkcnt: Number of blocks to write | |
552 | * @buffer: Address to read data from | |
553 | * @return number of blocks written, or -ve error number on error | |
554 | */ | |
555 | ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start, | |
556 | lbaint_t blkcnt, const void *buffer); | |
557 | ||
558 | /** | |
559 | * blk_select_hwpart_devnum() - select a hardware partition | |
560 | * | |
561 | * This is similar to blk_dselect_hwpart() but it looks up the interface and | |
562 | * device number. | |
563 | * | |
564 | * @if_type: Block device type | |
565 | * @devnum: Device number | |
566 | * @hwpart: Partition number to select | |
567 | * @return 0 if OK, -ve on error | |
568 | */ | |
569 | int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart); | |
570 | ||
1a73661b | 571 | #endif |