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 <efi.h> 11 12#ifdef CONFIG_SYS_64BIT_LBA 13typedef uint64_t lbaint_t; 14#define LBAFlength "ll" 15#else 16typedef ulong lbaint_t; 17#define LBAFlength "l" 18#endif 19#define LBAF "%" LBAFlength "x" 20#define LBAFU "%" LBAFlength "u" 21 22struct udevice; 23 24/* Interface types: */ 25enum if_type { 26 IF_TYPE_UNKNOWN = 0, 27 IF_TYPE_IDE, 28 IF_TYPE_SCSI, 29 IF_TYPE_ATAPI, 30 IF_TYPE_USB, 31 IF_TYPE_DOC, 32 IF_TYPE_MMC, 33 IF_TYPE_SD, 34 IF_TYPE_SATA, 35 IF_TYPE_HOST, 36 IF_TYPE_NVME, 37 IF_TYPE_EFI, 38 IF_TYPE_PVBLOCK, 39 IF_TYPE_VIRTIO, 40 41 IF_TYPE_COUNT, /* Number of interface types */ 42}; 43 44#define BLK_VEN_SIZE 40 45#define BLK_PRD_SIZE 20 46#define BLK_REV_SIZE 8 47 48/* 49 * Identifies the partition table type (ie. MBR vs GPT GUID) signature 50 */ 51enum sig_type { 52 SIG_TYPE_NONE, 53 SIG_TYPE_MBR, 54 SIG_TYPE_GUID, 55 56 SIG_TYPE_COUNT /* Number of signature types */ 57}; 58 59/* 60 * With driver model (CONFIG_BLK) this is uclass platform data, accessible 61 * with dev_get_uclass_plat(dev) 62 */ 63struct blk_desc { 64 /* 65 * TODO: With driver model we should be able to use the parent 66 * device's uclass instead. 67 */ 68 enum if_type if_type; /* type of the interface */ 69 int devnum; /* device number */ 70 unsigned char part_type; /* partition type */ 71 unsigned char target; /* target SCSI ID */ 72 unsigned char lun; /* target LUN */ 73 unsigned char hwpart; /* HW partition, e.g. for eMMC */ 74 unsigned char type; /* device type */ 75 unsigned char removable; /* removable device */ 76#ifdef CONFIG_LBA48 77 /* device can use 48bit addr (ATA/ATAPI v7) */ 78 unsigned char lba48; 79#endif 80 lbaint_t lba; /* number of blocks */ 81 unsigned long blksz; /* block size */ 82 int log2blksz; /* for convenience: log2(blksz) */ 83 char vendor[BLK_VEN_SIZE + 1]; /* device vendor string */ 84 char product[BLK_PRD_SIZE + 1]; /* device product number */ 85 char revision[BLK_REV_SIZE + 1]; /* firmware revision */ 86 enum sig_type sig_type; /* Partition table signature type */ 87 union { 88 uint32_t mbr_sig; /* MBR integer signature */ 89 efi_guid_t guid_sig; /* GPT GUID Signature */ 90 }; 91#if CONFIG_IS_ENABLED(BLK) 92 /* 93 * For now we have a few functions which take struct blk_desc as a 94 * parameter. This field allows them to look up the associated 95 * device. Once these functions are removed we can drop this field. 96 */ 97 struct udevice *bdev; 98#else 99 unsigned long (*block_read)(struct blk_desc *block_dev, 100 lbaint_t start, 101 lbaint_t blkcnt, 102 void *buffer); 103 unsigned long (*block_write)(struct blk_desc *block_dev, 104 lbaint_t start, 105 lbaint_t blkcnt, 106 const void *buffer); 107 unsigned long (*block_erase)(struct blk_desc *block_dev, 108 lbaint_t start, 109 lbaint_t blkcnt); 110 void *priv; /* driver private struct pointer */ 111#endif 112}; 113 114#define BLOCK_CNT(size, blk_desc) (PAD_COUNT(size, blk_desc->blksz)) 115#define PAD_TO_BLOCKSIZE(size, blk_desc) \ 116 (PAD_SIZE(size, blk_desc->blksz)) 117 118#if CONFIG_IS_ENABLED(BLOCK_CACHE) 119 120/** 121 * blkcache_init() - initialize the block cache list pointers 122 */ 123int blkcache_init(void); 124 125/** 126 * blkcache_read() - attempt to read a set of blocks from cache 127 * 128 * @param iftype - IF_TYPE_x for type of device 129 * @param dev - device index of particular type 130 * @param start - starting block number 131 * @param blkcnt - number of blocks to read 132 * @param blksz - size in bytes of each block 133 * @param buf - buffer to contain cached data 134 * 135 * @return - 1 if block returned from cache, 0 otherwise. 136 */ 137int blkcache_read(int iftype, int dev, 138 lbaint_t start, lbaint_t blkcnt, 139 unsigned long blksz, void *buffer); 140 141/** 142 * blkcache_fill() - make data read from a block device available 143 * to the block cache 144 * 145 * @param iftype - IF_TYPE_x for type of device 146 * @param dev - device index of particular type 147 * @param start - starting block number 148 * @param blkcnt - number of blocks available 149 * @param blksz - size in bytes of each block 150 * @param buf - buffer containing data to cache 151 * 152 */ 153void blkcache_fill(int iftype, int dev, 154 lbaint_t start, lbaint_t blkcnt, 155 unsigned long blksz, void const *buffer); 156 157/** 158 * blkcache_invalidate() - discard the cache for a set of blocks 159 * because of a write or device (re)initialization. 160 * 161 * @param iftype - IF_TYPE_x for type of device 162 * @param dev - device index of particular type 163 */ 164void blkcache_invalidate(int iftype, int dev); 165 166/** 167 * blkcache_configure() - configure block cache 168 * 169 * @param blocks - maximum blocks per entry 170 * @param entries - maximum entries in cache 171 */ 172void blkcache_configure(unsigned blocks, unsigned entries); 173 174/* 175 * statistics of the block cache 176 */ 177struct block_cache_stats { 178 unsigned hits; 179 unsigned misses; 180 unsigned entries; /* current entry count */ 181 unsigned max_blocks_per_entry; 182 unsigned max_entries; 183}; 184 185/** 186 * get_blkcache_stats() - return statistics and reset 187 * 188 * @param stats - statistics are copied here 189 */ 190void blkcache_stats(struct block_cache_stats *stats); 191 192#else 193 194static inline int blkcache_read(int iftype, int dev, 195 lbaint_t start, lbaint_t blkcnt, 196 unsigned long blksz, void *buffer) 197{ 198 return 0; 199} 200 201static inline void blkcache_fill(int iftype, int dev, 202 lbaint_t start, lbaint_t blkcnt, 203 unsigned long blksz, void const *buffer) {} 204 205static inline void blkcache_invalidate(int iftype, int dev) {} 206 207#endif 208 209#if CONFIG_IS_ENABLED(BLK) 210struct udevice; 211 212/* Operations on block devices */ 213struct blk_ops { 214 /** 215 * read() - read from a block device 216 * 217 * @dev: Device to read from 218 * @start: Start block number to read (0=first) 219 * @blkcnt: Number of blocks to read 220 * @buffer: Destination buffer for data read 221 * @return number of blocks read, or -ve error number (see the 222 * IS_ERR_VALUE() macro 223 */ 224 unsigned long (*read)(struct udevice *dev, lbaint_t start, 225 lbaint_t blkcnt, void *buffer); 226 227 /** 228 * write() - write to a block device 229 * 230 * @dev: Device to write to 231 * @start: Start block number to write (0=first) 232 * @blkcnt: Number of blocks to write 233 * @buffer: Source buffer for data to write 234 * @return number of blocks written, or -ve error number (see the 235 * IS_ERR_VALUE() macro 236 */ 237 unsigned long (*write)(struct udevice *dev, lbaint_t start, 238 lbaint_t blkcnt, const void *buffer); 239 240 /** 241 * erase() - erase a section of a block device 242 * 243 * @dev: Device to (partially) erase 244 * @start: Start block number to erase (0=first) 245 * @blkcnt: Number of blocks to erase 246 * @return number of blocks erased, or -ve error number (see the 247 * IS_ERR_VALUE() macro 248 */ 249 unsigned long (*erase)(struct udevice *dev, lbaint_t start, 250 lbaint_t blkcnt); 251 252 /** 253 * select_hwpart() - select a particular hardware partition 254 * 255 * Some devices (e.g. MMC) can support partitioning at the hardware 256 * level. This is quite separate from the normal idea of 257 * software-based partitions. MMC hardware partitions must be 258 * explicitly selected. Once selected only the region of the device 259 * covered by that partition is accessible. 260 * 261 * The MMC standard provides for two boot partitions (numbered 1 and 2), 262 * rpmb (3), and up to 4 addition general-purpose partitions (4-7). 263 * 264 * @desc: Block device to update 265 * @hwpart: Hardware partition number to select. 0 means the raw 266 * device, 1 is the first partition, 2 is the second, etc. 267 * @return 0 if OK, -ve on error 268 */ 269 int (*select_hwpart)(struct udevice *dev, int hwpart); 270}; 271 272#define blk_get_ops(dev) ((struct blk_ops *)(dev)->driver->ops) 273 274/* 275 * These functions should take struct udevice instead of struct blk_desc, 276 * but this is convenient for migration to driver model. Add a 'd' prefix 277 * to the function operations, so that blk_read(), etc. can be reserved for 278 * functions with the correct arguments. 279 */ 280unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start, 281 lbaint_t blkcnt, void *buffer); 282unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start, 283 lbaint_t blkcnt, const void *buffer); 284unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start, 285 lbaint_t blkcnt); 286 287/** 288 * blk_find_device() - Find a block device 289 * 290 * This function does not activate the device. The device will be returned 291 * whether or not it is activated. 292 * 293 * @if_type: Interface type (enum if_type_t) 294 * @devnum: Device number (specific to each interface type) 295 * @devp: the device, if found 296 * @return 0 if found, -ENODEV if no device found, or other -ve error value 297 */ 298int blk_find_device(int if_type, int devnum, struct udevice **devp); 299 300/** 301 * blk_get_device() - Find and probe a block device ready for use 302 * 303 * @if_type: Interface type (enum if_type_t) 304 * @devnum: Device number (specific to each interface type) 305 * @devp: the device, if found 306 * @return 0 if found, -ENODEV if no device found, or other -ve error value 307 */ 308int blk_get_device(int if_type, int devnum, struct udevice **devp); 309 310/** 311 * blk_first_device() - Find the first device for a given interface 312 * 313 * The device is probed ready for use 314 * 315 * @devnum: Device number (specific to each interface type) 316 * @devp: the device, if found 317 * @return 0 if found, -ENODEV if no device, or other -ve error value 318 */ 319int blk_first_device(int if_type, struct udevice **devp); 320 321/** 322 * blk_next_device() - Find the next device for a given interface 323 * 324 * This can be called repeatedly after blk_first_device() to iterate through 325 * all devices of the given interface type. 326 * 327 * The device is probed ready for use 328 * 329 * @devp: On entry, the previous device returned. On exit, the next 330 * device, if found 331 * @return 0 if found, -ENODEV if no device, or other -ve error value 332 */ 333int blk_next_device(struct udevice **devp); 334 335/** 336 * blk_create_device() - Create a new block device 337 * 338 * @parent: Parent of the new device 339 * @drv_name: Driver name to use for the block device 340 * @name: Name for the device 341 * @if_type: Interface type (enum if_type_t) 342 * @devnum: Device number, specific to the interface type, or -1 to 343 * allocate the next available number 344 * @blksz: Block size of the device in bytes (typically 512) 345 * @lba: Total number of blocks of the device 346 * @devp: the new device (which has not been probed) 347 */ 348int blk_create_device(struct udevice *parent, const char *drv_name, 349 const char *name, int if_type, int devnum, int blksz, 350 lbaint_t lba, struct udevice **devp); 351 352/** 353 * blk_create_devicef() - Create a new named block device 354 * 355 * @parent: Parent of the new device 356 * @drv_name: Driver name to use for the block device 357 * @name: Name for the device (parent name is prepended) 358 * @if_type: Interface type (enum if_type_t) 359 * @devnum: Device number, specific to the interface type, or -1 to 360 * allocate the next available number 361 * @blksz: Block size of the device in bytes (typically 512) 362 * @lba: Total number of blocks of the device 363 * @devp: the new device (which has not been probed) 364 */ 365int blk_create_devicef(struct udevice *parent, const char *drv_name, 366 const char *name, int if_type, int devnum, int blksz, 367 lbaint_t lba, struct udevice **devp); 368 369/** 370 * blk_unbind_all() - Unbind all device of the given interface type 371 * 372 * The devices are removed and then unbound. 373 * 374 * @if_type: Interface type to unbind 375 * @return 0 if OK, -ve on error 376 */ 377int blk_unbind_all(int if_type); 378 379/** 380 * blk_find_max_devnum() - find the maximum device number for an interface type 381 * 382 * Finds the last allocated device number for an interface type @if_type. The 383 * next number is safe to use for a newly allocated device. 384 * 385 * @if_type: Interface type to scan 386 * @return maximum device number found, or -ENODEV if none, or other -ve on 387 * error 388 */ 389int blk_find_max_devnum(enum if_type if_type); 390 391/** 392 * blk_next_free_devnum() - get the next device number for an interface type 393 * 394 * Finds the next number that is safe to use for a newly allocated device for 395 * an interface type @if_type. 396 * 397 * @if_type: Interface type to scan 398 * @return next device number safe to use, or -ve on error 399 */ 400int blk_next_free_devnum(enum if_type if_type); 401 402/** 403 * blk_select_hwpart() - select a hardware partition 404 * 405 * Select a hardware partition if the device supports it (typically MMC does) 406 * 407 * @dev: Device to update 408 * @hwpart: Partition number to select 409 * @return 0 if OK, -ve on error 410 */ 411int blk_select_hwpart(struct udevice *dev, int hwpart); 412 413/** 414 * blk_get_from_parent() - obtain a block device by looking up its parent 415 * 416 * All devices with 417 */ 418int blk_get_from_parent(struct udevice *parent, struct udevice **devp); 419 420/** 421 * blk_get_by_device() - Get the block device descriptor for the given device 422 * @dev: Instance of a storage device 423 * 424 * Return: With block device descriptor on success , NULL if there is no such 425 * block device. 426 */ 427struct blk_desc *blk_get_by_device(struct udevice *dev); 428 429#else 430#include <errno.h> 431/* 432 * These functions should take struct udevice instead of struct blk_desc, 433 * but this is convenient for migration to driver model. Add a 'd' prefix 434 * to the function operations, so that blk_read(), etc. can be reserved for 435 * functions with the correct arguments. 436 */ 437static inline ulong blk_dread(struct blk_desc *block_dev, lbaint_t start, 438 lbaint_t blkcnt, void *buffer) 439{ 440 ulong blks_read; 441 if (blkcache_read(block_dev->if_type, block_dev->devnum, 442 start, blkcnt, block_dev->blksz, buffer)) 443 return blkcnt; 444 445 /* 446 * We could check if block_read is NULL and return -ENOSYS. But this 447 * bloats the code slightly (cause some board to fail to build), and 448 * it would be an error to try an operation that does not exist. 449 */ 450 blks_read = block_dev->block_read(block_dev, start, blkcnt, buffer); 451 if (blks_read == blkcnt) 452 blkcache_fill(block_dev->if_type, block_dev->devnum, 453 start, blkcnt, block_dev->blksz, buffer); 454 455 return blks_read; 456} 457 458static inline ulong blk_dwrite(struct blk_desc *block_dev, lbaint_t start, 459 lbaint_t blkcnt, const void *buffer) 460{ 461 blkcache_invalidate(block_dev->if_type, block_dev->devnum); 462 return block_dev->block_write(block_dev, start, blkcnt, buffer); 463} 464 465static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start, 466 lbaint_t blkcnt) 467{ 468 blkcache_invalidate(block_dev->if_type, block_dev->devnum); 469 return block_dev->block_erase(block_dev, start, blkcnt); 470} 471 472/** 473 * struct blk_driver - Driver for block interface types 474 * 475 * This provides access to the block devices for each interface type. One 476 * driver should be provided using U_BOOT_LEGACY_BLK() for each interface 477 * type that is to be supported. 478 * 479 * @if_typename: Interface type name 480 * @if_type: Interface type 481 * @max_devs: Maximum number of devices supported 482 * @desc: Pointer to list of devices for this interface type, 483 * or NULL to use @get_dev() instead 484 */ 485struct blk_driver { 486 const char *if_typename; 487 enum if_type if_type; 488 int max_devs; 489 struct blk_desc *desc; 490 /** 491 * get_dev() - get a pointer to a block device given its number 492 * 493 * Each interface allocates its own devices and typically 494 * struct blk_desc is contained with the interface's data structure. 495 * There is no global numbering for block devices. This method allows 496 * the device for an interface type to be obtained when @desc is NULL. 497 * 498 * @devnum: Device number (0 for first device on that interface, 499 * 1 for second, etc. 500 * @descp: Returns pointer to the block device on success 501 * @return 0 if OK, -ve on error 502 */ 503 int (*get_dev)(int devnum, struct blk_desc **descp); 504 505 /** 506 * select_hwpart() - Select a hardware partition 507 * 508 * Some devices (e.g. MMC) can support partitioning at the hardware 509 * level. This is quite separate from the normal idea of 510 * software-based partitions. MMC hardware partitions must be 511 * explicitly selected. Once selected only the region of the device 512 * covered by that partition is accessible. 513 * 514 * The MMC standard provides for two boot partitions (numbered 1 and 2), 515 * rpmb (3), and up to 4 addition general-purpose partitions (4-7). 516 * Partition 0 is the main user-data partition. 517 * 518 * @desc: Block device descriptor 519 * @hwpart: Hardware partition number to select. 0 means the main 520 * user-data partition, 1 is the first partition, 2 is 521 * the second, etc. 522 * @return 0 if OK, other value for an error 523 */ 524 int (*select_hwpart)(struct blk_desc *desc, int hwpart); 525}; 526 527/* 528 * Declare a new U-Boot legacy block driver. New drivers should use driver 529 * model (UCLASS_BLK). 530 */ 531#define U_BOOT_LEGACY_BLK(__name) \ 532 ll_entry_declare(struct blk_driver, __name, blk_driver) 533 534struct blk_driver *blk_driver_lookup_type(int if_type); 535 536#endif /* !CONFIG_BLK */ 537 538/** 539 * blk_get_devnum_by_typename() - Get a block device by type and number 540 * 541 * This looks through the available block devices of the given type, returning 542 * the one with the given @devnum. 543 * 544 * @if_type: Block device type 545 * @devnum: Device number 546 * @return point to block device descriptor, or NULL if not found 547 */ 548struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum); 549 550/** 551 * blk_get_devnum_by_type() - Get a block device by type name, and number 552 * 553 * This looks up the block device type based on @if_typename, then calls 554 * blk_get_devnum_by_type(). 555 * 556 * @if_typename: Block device type name 557 * @devnum: Device number 558 * @return point to block device descriptor, or NULL if not found 559 */ 560struct blk_desc *blk_get_devnum_by_typename(const char *if_typename, 561 int devnum); 562 563/** 564 * blk_dselect_hwpart() - select a hardware partition 565 * 566 * This selects a hardware partition (such as is supported by MMC). The block 567 * device size may change as this effectively points the block device to a 568 * partition at the hardware level. See the select_hwpart() method above. 569 * 570 * @desc: Block device descriptor for the device to select 571 * @hwpart: Partition number to select 572 * @return 0 if OK, -ve on error 573 */ 574int blk_dselect_hwpart(struct blk_desc *desc, int hwpart); 575 576/** 577 * blk_list_part() - list the partitions for block devices of a given type 578 * 579 * This looks up the partition type for each block device of type @if_type, 580 * then displays a list of partitions. 581 * 582 * @if_type: Block device type 583 * @return 0 if OK, -ENODEV if there is none of that type 584 */ 585int blk_list_part(enum if_type if_type); 586 587/** 588 * blk_list_devices() - list the block devices of a given type 589 * 590 * This lists each block device of the type @if_type, showing the capacity 591 * as well as type-specific information. 592 * 593 * @if_type: Block device type 594 */ 595void blk_list_devices(enum if_type if_type); 596 597/** 598 * blk_show_device() - show information about a given block device 599 * 600 * This shows the block device capacity as well as type-specific information. 601 * 602 * @if_type: Block device type 603 * @devnum: Device number 604 * @return 0 if OK, -ENODEV for invalid device number 605 */ 606int blk_show_device(enum if_type if_type, int devnum); 607 608/** 609 * blk_print_device_num() - show information about a given block device 610 * 611 * This is similar to blk_show_device() but returns an error if the block 612 * device type is unknown. 613 * 614 * @if_type: Block device type 615 * @devnum: Device number 616 * @return 0 if OK, -ENODEV for invalid device number, -ENOENT if the block 617 * device is not connected 618 */ 619int blk_print_device_num(enum if_type if_type, int devnum); 620 621/** 622 * blk_print_part_devnum() - print the partition information for a device 623 * 624 * @if_type: Block device type 625 * @devnum: Device number 626 * @return 0 if OK, -ENOENT if the block device is not connected, -ENOSYS if 627 * the interface type is not supported, other -ve on other error 628 */ 629int blk_print_part_devnum(enum if_type if_type, int devnum); 630 631/** 632 * blk_read_devnum() - read blocks from a device 633 * 634 * @if_type: Block device type 635 * @devnum: Device number 636 * @blkcnt: Number of blocks to read 637 * @buffer: Address to write data to 638 * @return number of blocks read, or -ve error number on error 639 */ 640ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start, 641 lbaint_t blkcnt, void *buffer); 642 643/** 644 * blk_write_devnum() - write blocks to a device 645 * 646 * @if_type: Block device type 647 * @devnum: Device number 648 * @blkcnt: Number of blocks to write 649 * @buffer: Address to read data from 650 * @return number of blocks written, or -ve error number on error 651 */ 652ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start, 653 lbaint_t blkcnt, const void *buffer); 654 655/** 656 * blk_select_hwpart_devnum() - select a hardware partition 657 * 658 * This is similar to blk_dselect_hwpart() but it looks up the interface and 659 * device number. 660 * 661 * @if_type: Block device type 662 * @devnum: Device number 663 * @hwpart: Partition number to select 664 * @return 0 if OK, -ve on error 665 */ 666int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart); 667 668/** 669 * blk_get_if_type_name() - Get the name of an interface type 670 * 671 * @if_type: Interface type to check 672 * @return name of interface, or NULL if none 673 */ 674const char *blk_get_if_type_name(enum if_type if_type); 675 676/** 677 * blk_common_cmd() - handle common commands with block devices 678 * 679 * @args: Number of arguments to the command (argv[0] is the command itself) 680 * @argv: Command arguments 681 * @if_type: Interface type 682 * @cur_devnump: Current device number for this interface type 683 * @return 0 if OK, CMD_RET_ERROR on error 684 */ 685int blk_common_cmd(int argc, char *const argv[], enum if_type if_type, 686 int *cur_devnump); 687 688enum blk_flag_t { 689 BLKF_FIXED = 1 << 0, 690 BLKF_REMOVABLE = 1 << 1, 691 BLKF_BOTH = BLKF_FIXED | BLKF_REMOVABLE, 692}; 693 694/** 695 * blk_first_device_err() - Get the first block device 696 * 697 * The device returned is probed if necessary, and ready for use 698 * 699 * @flags: Indicates type of device to return 700 * @devp: Returns pointer to the first device in that uclass, or NULL if none 701 * @return 0 if found, -ENODEV if not found, other -ve on error 702 */ 703int blk_first_device_err(enum blk_flag_t flags, struct udevice **devp); 704 705/** 706 * blk_next_device_err() - Get the next block device 707 * 708 * The device returned is probed if necessary, and ready for use 709 * 710 * @flags: Indicates type of device to return 711 * @devp: On entry, pointer to device to lookup. On exit, returns pointer 712 * to the next device in the uclass if no error occurred, or -ENODEV if 713 * there is no next device. 714 * @return 0 if found, -ENODEV if not found, other -ve on error 715 */ 716int blk_next_device_err(enum blk_flag_t flags, struct udevice **devp); 717 718/** 719 * blk_foreach_probe() - Helper function to iteration through block devices 720 * 721 * This creates a for() loop which works through the available devices in 722 * a uclass in order from start to end. Devices are probed if necessary, 723 * and ready for use. 724 * 725 * @flags: Indicates type of device to return 726 * @dev: struct udevice * to hold the current device. Set to NULL when there 727 * are no more devices. 728 */ 729#define blk_foreach_probe(flags, pos) \ 730 for (int _ret = blk_first_device_err(flags, &(pos)); \ 731 !_ret && pos; \ 732 _ret = blk_next_device_err(flags, &(pos))) 733 734/** 735 * blk_count_devices() - count the number of devices of a particular type 736 * 737 * @flags: Indicates type of device to find 738 * @return number of devices matching those flags 739 */ 740int blk_count_devices(enum blk_flag_t flag); 741 742#endif 743