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 #include <efi.h>
12
13 #ifdef CONFIG_SYS_64BIT_LBA
14 typedef uint64_t lbaint_t;
15 #define LBAFlength "ll"
16 #else
17 typedef ulong lbaint_t;
18 #define LBAFlength "l"
19 #endif
20 #define LBAF "%" LBAFlength "x"
21 #define LBAFU "%" LBAFlength "u"
22
23 /* Interface types: */
24 enum if_type {
25 IF_TYPE_UNKNOWN = 0,
26 IF_TYPE_IDE,
27 IF_TYPE_SCSI,
28 IF_TYPE_ATAPI,
29 IF_TYPE_USB,
30 IF_TYPE_DOC,
31 IF_TYPE_MMC,
32 IF_TYPE_SD,
33 IF_TYPE_SATA,
34 IF_TYPE_HOST,
35 IF_TYPE_SYSTEMACE,
36 IF_TYPE_NVME,
37 IF_TYPE_RKNAND,
38 IF_TYPE_SPINAND,
39 IF_TYPE_SPINOR,
40 IF_TYPE_RAMDISK,
41 IF_TYPE_MTD,
42 IF_TYPE_COUNT, /* Number of interface types */
43 };
44
45 /* define mtd device devnum */
46 #define BLK_MTD_NAND 0
47 #define BLK_MTD_SPI_NAND 1
48 #define BLK_MTD_SPI_NOR 2
49
50 #define BLK_VEN_SIZE 40
51 #define BLK_PRD_SIZE 20
52 #define BLK_REV_SIZE 8
53
54 /* define block device operation flags */
55 #define BLK_PRE_RW BIT(0) /* Block prepare read & write*/
56 #define BLK_MTD_CONT_WRITE BIT(1) /* Special for Nand device P/E */
57
58 /*
59 * Identifies the partition table type (ie. MBR vs GPT GUID) signature
60 */
61 enum sig_type {
62 SIG_TYPE_NONE,
63 SIG_TYPE_MBR,
64 SIG_TYPE_GUID,
65
66 SIG_TYPE_COUNT /* Number of signature types */
67 };
68
69 /*
70 * With driver model (CONFIG_BLK) this is uclass platform data, accessible
71 * with dev_get_uclass_platdata(dev)
72 */
73 struct blk_desc {
74 /*
75 * TODO: With driver model we should be able to use the parent
76 * device's uclass instead.
77 */
78 enum if_type if_type; /* type of the interface */
79 int devnum; /* device number */
80 unsigned char part_type; /* partition type */
81 unsigned char target; /* target SCSI ID */
82 unsigned char lun; /* target LUN */
83 unsigned char hwpart; /* HW partition, e.g. for eMMC */
84 unsigned char type; /* device type */
85 unsigned char removable; /* removable device */
86 unsigned char op_flag; /* Some special operation flags */
87 #ifdef CONFIG_LBA48
88 /* device can use 48bit addr (ATA/ATAPI v7) */
89 unsigned char lba48;
90 #endif
91 lbaint_t lba; /* number of blocks */
92 unsigned long blksz; /* block size */
93 int log2blksz; /* for convenience: log2(blksz) */
94 char vendor[BLK_VEN_SIZE + 1]; /* device vendor string */
95 char product[BLK_PRD_SIZE + 1]; /* device product number */
96 char revision[BLK_REV_SIZE + 1]; /* firmware revision */
97 enum sig_type sig_type; /* Partition table signature type */
98 union {
99 uint32_t mbr_sig; /* MBR integer signature */
100 efi_guid_t guid_sig; /* GPT GUID Signature */
101 };
102 #if CONFIG_IS_ENABLED(BLK)
103 /*
104 * For now we have a few functions which take struct blk_desc as a
105 * parameter. This field allows them to look up the associated
106 * device. Once these functions are removed we can drop this field.
107 */
108 struct udevice *bdev;
109 #else
110 unsigned long (*block_read)(struct blk_desc *block_dev,
111 lbaint_t start,
112 lbaint_t blkcnt,
113 void *buffer);
114 unsigned long (*block_write)(struct blk_desc *block_dev,
115 lbaint_t start,
116 lbaint_t blkcnt,
117 const void *buffer);
118 unsigned long (*block_erase)(struct blk_desc *block_dev,
119 lbaint_t start,
120 lbaint_t blkcnt);
121 void *priv; /* driver private struct pointer */
122 #endif
123 };
124
125 #define BLOCK_CNT(size, blk_desc) (PAD_COUNT(size, blk_desc->blksz))
126 #define PAD_TO_BLOCKSIZE(size, blk_desc) \
127 (PAD_SIZE(size, blk_desc->blksz))
128
129 #ifdef CONFIG_BLOCK_CACHE
130 /**
131 * blkcache_read() - attempt to read a set of blocks from cache
132 *
133 * @param iftype - IF_TYPE_x for type of device
134 * @param dev - device index of particular type
135 * @param start - starting block number
136 * @param blkcnt - number of blocks to read
137 * @param blksz - size in bytes of each block
138 * @param buf - buffer to contain cached data
139 *
140 * @return - '1' if block returned from cache, '0' otherwise.
141 */
142 int blkcache_read(int iftype, int dev,
143 lbaint_t start, lbaint_t blkcnt,
144 unsigned long blksz, void *buffer);
145
146 /**
147 * blkcache_fill() - make data read from a block device available
148 * to the block cache
149 *
150 * @param iftype - IF_TYPE_x for type of device
151 * @param dev - device index of particular type
152 * @param start - starting block number
153 * @param blkcnt - number of blocks available
154 * @param blksz - size in bytes of each block
155 * @param buf - buffer containing data to cache
156 *
157 */
158 void blkcache_fill(int iftype, int dev,
159 lbaint_t start, lbaint_t blkcnt,
160 unsigned long blksz, void const *buffer);
161
162 /**
163 * blkcache_invalidate() - discard the cache for a set of blocks
164 * because of a write or device (re)initialization.
165 *
166 * @param iftype - IF_TYPE_x for type of device
167 * @param dev - device index of particular type
168 */
169 void blkcache_invalidate(int iftype, int dev);
170
171 /**
172 * blkcache_configure() - configure block cache
173 *
174 * @param blocks - maximum blocks per entry
175 * @param entries - maximum entries in cache
176 */
177 void blkcache_configure(unsigned blocks, unsigned entries);
178
179 /*
180 * statistics of the block cache
181 */
182 struct block_cache_stats {
183 unsigned hits;
184 unsigned misses;
185 unsigned entries; /* current entry count */
186 unsigned max_blocks_per_entry;
187 unsigned max_entries;
188 };
189
190 /**
191 * get_blkcache_stats() - return statistics and reset
192 *
193 * @param stats - statistics are copied here
194 */
195 void blkcache_stats(struct block_cache_stats *stats);
196
197 #else
198
blkcache_read(int iftype,int dev,lbaint_t start,lbaint_t blkcnt,unsigned long blksz,void * buffer)199 static inline int blkcache_read(int iftype, int dev,
200 lbaint_t start, lbaint_t blkcnt,
201 unsigned long blksz, void *buffer)
202 {
203 return 0;
204 }
205
blkcache_fill(int iftype,int dev,lbaint_t start,lbaint_t blkcnt,unsigned long blksz,void const * buffer)206 static inline void blkcache_fill(int iftype, int dev,
207 lbaint_t start, lbaint_t blkcnt,
208 unsigned long blksz, void const *buffer) {}
209
blkcache_invalidate(int iftype,int dev)210 static inline void blkcache_invalidate(int iftype, int dev) {}
211
212 #endif
213
214 #if CONFIG_IS_ENABLED(BLK)
215 struct udevice;
216
217 /* Operations on block devices */
218 struct blk_ops {
219 /**
220 * read() - read from a block device
221 *
222 * @dev: Device to read from
223 * @start: Start block number to read (0=first)
224 * @blkcnt: Number of blocks to read
225 * @buffer: Destination buffer for data read
226 * @return number of blocks read, or -ve error number (see the
227 * IS_ERR_VALUE() macro
228 */
229 unsigned long (*read)(struct udevice *dev, lbaint_t start,
230 lbaint_t blkcnt, void *buffer);
231
232 /**
233 * write() - write to a block device
234 *
235 * @dev: Device to write to
236 * @start: Start block number to write (0=first)
237 * @blkcnt: Number of blocks to write
238 * @buffer: Source buffer for data to write
239 * @return number of blocks written, or -ve error number (see the
240 * IS_ERR_VALUE() macro
241 */
242 unsigned long (*write)(struct udevice *dev, lbaint_t start,
243 lbaint_t blkcnt, const void *buffer);
244
245 /**
246 * erase() - erase a section of a block device
247 *
248 * @dev: Device to (partially) erase
249 * @start: Start block number to erase (0=first)
250 * @blkcnt: Number of blocks to erase
251 * @return number of blocks erased, or -ve error number (see the
252 * IS_ERR_VALUE() macro
253 */
254 unsigned long (*erase)(struct udevice *dev, lbaint_t start,
255 lbaint_t blkcnt);
256
257 /**
258 * select_hwpart() - select a particular hardware partition
259 *
260 * Some devices (e.g. MMC) can support partitioning at the hardware
261 * level. This is quite separate from the normal idea of
262 * software-based partitions. MMC hardware partitions must be
263 * explicitly selected. Once selected only the region of the device
264 * covered by that partition is accessible.
265 *
266 * The MMC standard provides for two boot partitions (numbered 1 and 2),
267 * rpmb (3), and up to 4 addition general-purpose partitions (4-7).
268 *
269 * @desc: Block device to update
270 * @hwpart: Hardware partition number to select. 0 means the raw
271 * device, 1 is the first partition, 2 is the second, etc.
272 * @return 0 if OK, -ve on error
273 */
274 int (*select_hwpart)(struct udevice *dev, int hwpart);
275 };
276
277 #define blk_get_ops(dev) ((struct blk_ops *)(dev)->driver->ops)
278
279 /*
280 * These functions should take struct udevice instead of struct blk_desc,
281 * but this is convenient for migration to driver model. Add a 'd' prefix
282 * to the function operations, so that blk_read(), etc. can be reserved for
283 * functions with the correct arguments.
284 */
285 unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start,
286 lbaint_t blkcnt, void *buffer);
287 unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
288 lbaint_t blkcnt, const void *buffer);
289 unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start,
290 lbaint_t blkcnt);
291
292 /**
293 * blk_find_device() - Find a block device
294 *
295 * This function does not activate the device. The device will be returned
296 * whether or not it is activated.
297 *
298 * @if_type: Interface type (enum if_type_t)
299 * @devnum: Device number (specific to each interface type)
300 * @devp: the device, if found
301 * @return 0 if found, -ENODEV if no device found, or other -ve error value
302 */
303 int blk_find_device(int if_type, int devnum, struct udevice **devp);
304
305 /**
306 * blk_get_device() - Find and probe a block device ready for use
307 *
308 * @if_type: Interface type (enum if_type_t)
309 * @devnum: Device number (specific to each interface type)
310 * @devp: the device, if found
311 * @return 0 if found, -ENODEV if no device found, or other -ve error value
312 */
313 int blk_get_device(int if_type, int devnum, struct udevice **devp);
314
315 /**
316 * blk_first_device() - Find the first device for a given interface
317 *
318 * The device is probed ready for use
319 *
320 * @devnum: Device number (specific to each interface type)
321 * @devp: the device, if found
322 * @return 0 if found, -ENODEV if no device, or other -ve error value
323 */
324 int blk_first_device(int if_type, struct udevice **devp);
325
326 /**
327 * blk_next_device() - Find the next device for a given interface
328 *
329 * This can be called repeatedly after blk_first_device() to iterate through
330 * all devices of the given interface type.
331 *
332 * The device is probed ready for use
333 *
334 * @devp: On entry, the previous device returned. On exit, the next
335 * device, if found
336 * @return 0 if found, -ENODEV if no device, or other -ve error value
337 */
338 int blk_next_device(struct udevice **devp);
339
340 /**
341 * blk_create_device() - Create a new block device
342 *
343 * @parent: Parent of the new device
344 * @drv_name: Driver name to use for the block device
345 * @name: Name for the device
346 * @if_type: Interface type (enum if_type_t)
347 * @devnum: Device number, specific to the interface type, or -1 to
348 * allocate the next available number
349 * @blksz: Block size of the device in bytes (typically 512)
350 * @size: Total size of the device in bytes
351 * @devp: the new device (which has not been probed)
352 */
353 int blk_create_device(struct udevice *parent, const char *drv_name,
354 const char *name, int if_type, int devnum, int blksz,
355 lbaint_t size, struct udevice **devp);
356
357 /**
358 * blk_create_devicef() - Create a new named block device
359 *
360 * @parent: Parent of the new device
361 * @drv_name: Driver name to use for the block device
362 * @name: Name for the device (parent name is prepended)
363 * @if_type: Interface type (enum if_type_t)
364 * @devnum: Device number, specific to the interface type, or -1 to
365 * allocate the next available number
366 * @blksz: Block size of the device in bytes (typically 512)
367 * @size: Total size of the device in bytes
368 * @devp: the new device (which has not been probed)
369 */
370 int blk_create_devicef(struct udevice *parent, const char *drv_name,
371 const char *name, int if_type, int devnum, int blksz,
372 lbaint_t size, struct udevice **devp);
373
374 /**
375 * blk_prepare_device() - Prepare a block device for use
376 *
377 * This reads partition information from the device if supported.
378 *
379 * @dev: Device to prepare
380 * @return 0 if ok, -ve on error
381 */
382 int blk_prepare_device(struct udevice *dev);
383
384 /**
385 * blk_unbind_all() - Unbind all device of the given interface type
386 *
387 * The devices are removed and then unbound.
388 *
389 * @if_type: Interface type to unbind
390 * @return 0 if OK, -ve on error
391 */
392 int blk_unbind_all(int if_type);
393
394 /**
395 * blk_find_max_devnum() - find the maximum device number for an interface type
396 *
397 * Finds the last allocated device number for an interface type @if_type. The
398 * next number is safe to use for a newly allocated device.
399 *
400 * @if_type: Interface type to scan
401 * @return maximum device number found, or -ENODEV if none, or other -ve on
402 * error
403 */
404 int blk_find_max_devnum(enum if_type if_type);
405
406 /**
407 * blk_select_hwpart() - select a hardware partition
408 *
409 * Select a hardware partition if the device supports it (typically MMC does)
410 *
411 * @dev: Device to update
412 * @hwpart: Partition number to select
413 * @return 0 if OK, -ve on error
414 */
415 int blk_select_hwpart(struct udevice *dev, int hwpart);
416
417 /**
418 * blk_get_from_parent() - obtain a block device by looking up its parent
419 *
420 * All devices with
421 */
422 int blk_get_from_parent(struct udevice *parent, struct udevice **devp);
423
424 #else
425 #include <errno.h>
426 /*
427 * These functions should take struct udevice instead of struct blk_desc,
428 * but this is convenient for migration to driver model. Add a 'd' prefix
429 * to the function operations, so that blk_read(), etc. can be reserved for
430 * functions with the correct arguments.
431 */
blk_dread(struct blk_desc * block_dev,lbaint_t start,lbaint_t blkcnt,void * buffer)432 static inline ulong blk_dread(struct blk_desc *block_dev, lbaint_t start,
433 lbaint_t blkcnt, void *buffer)
434 {
435 ulong blks_read;
436 if (blkcache_read(block_dev->if_type, block_dev->devnum,
437 start, blkcnt, block_dev->blksz, buffer))
438 return blkcnt;
439
440 /*
441 * We could check if block_read is NULL and return -ENOSYS. But this
442 * bloats the code slightly (cause some board to fail to build), and
443 * it would be an error to try an operation that does not exist.
444 */
445 blks_read = block_dev->block_read(block_dev, start, blkcnt, buffer);
446 if (blks_read == blkcnt)
447 blkcache_fill(block_dev->if_type, block_dev->devnum,
448 start, blkcnt, block_dev->blksz, buffer);
449
450 return blks_read;
451 }
452
blk_dwrite(struct blk_desc * block_dev,lbaint_t start,lbaint_t blkcnt,const void * buffer)453 static inline ulong blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
454 lbaint_t blkcnt, const void *buffer)
455 {
456 blkcache_invalidate(block_dev->if_type, block_dev->devnum);
457 return block_dev->block_write(block_dev, start, blkcnt, buffer);
458 }
459
blk_derase(struct blk_desc * block_dev,lbaint_t start,lbaint_t blkcnt)460 static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start,
461 lbaint_t blkcnt)
462 {
463 blkcache_invalidate(block_dev->if_type, block_dev->devnum);
464 return block_dev->block_erase(block_dev, start, blkcnt);
465 }
466
467 /**
468 * struct blk_driver - Driver for block interface types
469 *
470 * This provides access to the block devices for each interface type. One
471 * driver should be provided using U_BOOT_LEGACY_BLK() for each interface
472 * type that is to be supported.
473 *
474 * @if_typename: Interface type name
475 * @if_type: Interface type
476 * @max_devs: Maximum number of devices supported
477 * @desc: Pointer to list of devices for this interface type,
478 * or NULL to use @get_dev() instead
479 */
480 struct blk_driver {
481 const char *if_typename;
482 enum if_type if_type;
483 int max_devs;
484 struct blk_desc *desc;
485 /**
486 * get_dev() - get a pointer to a block device given its number
487 *
488 * Each interface allocates its own devices and typically
489 * struct blk_desc is contained with the interface's data structure.
490 * There is no global numbering for block devices. This method allows
491 * the device for an interface type to be obtained when @desc is NULL.
492 *
493 * @devnum: Device number (0 for first device on that interface,
494 * 1 for second, etc.
495 * @descp: Returns pointer to the block device on success
496 * @return 0 if OK, -ve on error
497 */
498 int (*get_dev)(int devnum, struct blk_desc **descp);
499
500 /**
501 * select_hwpart() - Select a hardware partition
502 *
503 * Some devices (e.g. MMC) can support partitioning at the hardware
504 * level. This is quite separate from the normal idea of
505 * software-based partitions. MMC hardware partitions must be
506 * explicitly selected. Once selected only the region of the device
507 * covered by that partition is accessible.
508 *
509 * The MMC standard provides for two boot partitions (numbered 1 and 2),
510 * rpmb (3), and up to 4 addition general-purpose partitions (4-7).
511 * Partition 0 is the main user-data partition.
512 *
513 * @desc: Block device descriptor
514 * @hwpart: Hardware partition number to select. 0 means the main
515 * user-data partition, 1 is the first partition, 2 is
516 * the second, etc.
517 * @return 0 if OK, other value for an error
518 */
519 int (*select_hwpart)(struct blk_desc *desc, int hwpart);
520 };
521
522 /*
523 * Declare a new U-Boot legacy block driver. New drivers should use driver
524 * model (UCLASS_BLK).
525 */
526 #define U_BOOT_LEGACY_BLK(__name) \
527 ll_entry_declare(struct blk_driver, __name, blk_driver)
528
529 struct blk_driver *blk_driver_lookup_type(int if_type);
530
531 #endif /* !CONFIG_BLK */
532
533 /**
534 * blk_get_devnum_by_typename() - Get a block device by type and number
535 *
536 * This looks through the available block devices of the given type, returning
537 * the one with the given @devnum.
538 *
539 * @if_type: Block device type
540 * @devnum: Device number
541 * @return point to block device descriptor, or NULL if not found
542 */
543 struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum);
544
545 /**
546 * blk_get_devnum_by_type() - Get a block device by type name, and number
547 *
548 * This looks up the block device type based on @if_typename, then calls
549 * blk_get_devnum_by_type().
550 *
551 * @if_typename: Block device type name
552 * @devnum: Device number
553 * @return point to block device descriptor, or NULL if not found
554 */
555 struct blk_desc *blk_get_devnum_by_typename(const char *if_typename,
556 int devnum);
557
558 /**
559 * blk_dselect_hwpart() - select a hardware partition
560 *
561 * This selects a hardware partition (such as is supported by MMC). The block
562 * device size may change as this effectively points the block device to a
563 * partition at the hardware level. See the select_hwpart() method above.
564 *
565 * @desc: Block device descriptor for the device to select
566 * @hwpart: Partition number to select
567 * @return 0 if OK, -ve on error
568 */
569 int blk_dselect_hwpart(struct blk_desc *desc, int hwpart);
570
571 /**
572 * blk_list_part() - list the partitions for block devices of a given type
573 *
574 * This looks up the partition type for each block device of type @if_type,
575 * then displays a list of partitions.
576 *
577 * @if_type: Block device type
578 * @return 0 if OK, -ENODEV if there is none of that type
579 */
580 int blk_list_part(enum if_type if_type);
581
582 /**
583 * blk_list_devices() - list the block devices of a given type
584 *
585 * This lists each block device of the type @if_type, showing the capacity
586 * as well as type-specific information.
587 *
588 * @if_type: Block device type
589 */
590 void blk_list_devices(enum if_type if_type);
591
592 /**
593 * blk_show_device() - show information about a given block device
594 *
595 * This shows the block device capacity as well as type-specific information.
596 *
597 * @if_type: Block device type
598 * @devnum: Device number
599 * @return 0 if OK, -ENODEV for invalid device number
600 */
601 int blk_show_device(enum if_type if_type, int devnum);
602
603 /**
604 * blk_print_device_num() - show information about a given block device
605 *
606 * This is similar to blk_show_device() but returns an error if the block
607 * device type is unknown.
608 *
609 * @if_type: Block device type
610 * @devnum: Device number
611 * @return 0 if OK, -ENODEV for invalid device number, -ENOENT if the block
612 * device is not connected
613 */
614 int blk_print_device_num(enum if_type if_type, int devnum);
615
616 /**
617 * blk_print_part_devnum() - print the partition information for a device
618 *
619 * @if_type: Block device type
620 * @devnum: Device number
621 * @return 0 if OK, -ENOENT if the block device is not connected, -ENOSYS if
622 * the interface type is not supported, other -ve on other error
623 */
624 int blk_print_part_devnum(enum if_type if_type, int devnum);
625
626 /**
627 * blk_read_devnum() - read blocks from a device
628 *
629 * @if_type: Block device type
630 * @devnum: Device number
631 * @blkcnt: Number of blocks to read
632 * @buffer: Address to write data to
633 * @return number of blocks read, or -ve error number on error
634 */
635 ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start,
636 lbaint_t blkcnt, void *buffer);
637
638 /**
639 * blk_write_devnum() - write blocks to a device
640 *
641 * @if_type: Block device type
642 * @devnum: Device number
643 * @blkcnt: Number of blocks to write
644 * @buffer: Address to read data from
645 * @return number of blocks written, or -ve error number on error
646 */
647 ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start,
648 lbaint_t blkcnt, const void *buffer);
649
650 /**
651 * blk_erase_devnum() - erase blocks to a device
652 *
653 * @if_type: Block device type
654 * @devnum: Device number
655 * @blkcnt: Number of blocks to erase
656 * @return number of blocks erased, or -ve error number on error
657 */
658 ulong blk_erase_devnum(enum if_type if_type, int devnum, lbaint_t start,
659 lbaint_t blkcnt);
660 /**
661 * blk_select_hwpart_devnum() - select a hardware partition
662 *
663 * This is similar to blk_dselect_hwpart() but it looks up the interface and
664 * device number.
665 *
666 * @if_type: Block device type
667 * @devnum: Device number
668 * @hwpart: Partition number to select
669 * @return 0 if OK, -ve on error
670 */
671 int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart);
672
673 /**
674 * blk_get_if_type_name() - Get the name of an interface type
675 *
676 * @if_type: Interface type to check
677 * @return name of interface, or NULL if none
678 */
679 const char *blk_get_if_type_name(enum if_type if_type);
680
681 /**
682 * blk_common_cmd() - handle common commands with block devices
683 *
684 * @args: Number of arguments to the command (argv[0] is the command itself)
685 * @argv: Command arguments
686 * @if_type: Interface type
687 * @cur_devnump: Current device number for this interface type
688 * @return 0 if OK, CMD_RET_ERROR on error
689 */
690 int blk_common_cmd(int argc, char * const argv[], enum if_type if_type,
691 int *cur_devnump);
692
693 /**
694 * if_typename_to_iftype() - get iftype according to iftype name
695 *
696 * @if_typename: iftype name
697 * @return iftype index
698 */
699 enum if_type if_typename_to_iftype(const char *if_typename);
700
701 #endif
702