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_LOADER, 38 IF_TYPE_PVBLOCK, 39 IF_TYPE_VIRTIO, 40 IF_TYPE_EFI_MEDIA, 41 42 IF_TYPE_COUNT, /* Number of interface types */ 43}; 44 45#define BLK_VEN_SIZE 40 46#define BLK_PRD_SIZE 20 47#define BLK_REV_SIZE 8 48 49#define PART_FORMAT_PCAT 0x1 50#define PART_FORMAT_GPT 0x2 51 52/* 53 * Identifies the partition table type (ie. MBR vs GPT GUID) signature 54 */ 55enum sig_type { 56 SIG_TYPE_NONE, 57 SIG_TYPE_MBR, 58 SIG_TYPE_GUID, 59 60 SIG_TYPE_COUNT /* Number of signature types */ 61}; 62 63/* 64 * With driver model (CONFIG_BLK) this is uclass platform data, accessible 65 * with dev_get_uclass_plat(dev) 66 */ 67struct blk_desc { 68 /* 69 * TODO: With driver model we should be able to use the parent 70 * device's uclass instead. 71 */ 72 enum if_type if_type; /* type of the interface */ 73 int devnum; /* device number */ 74 unsigned char part_type; /* partition type */ 75 unsigned char target; /* target SCSI ID */ 76 unsigned char lun; /* target LUN */ 77 unsigned char hwpart; /* HW partition, e.g. for eMMC */ 78 unsigned char type; /* device type */ 79 unsigned char removable; /* removable device */ 80#ifdef CONFIG_LBA48 81 /* device can use 48bit addr (ATA/ATAPI v7) */ 82 unsigned char lba48; 83#endif 84 lbaint_t lba; /* number of blocks */ 85 unsigned long blksz; /* block size */ 86 int log2blksz; /* for convenience: log2(blksz) */ 87 char vendor[BLK_VEN_SIZE + 1]; /* device vendor string */ 88 char product[BLK_PRD_SIZE + 1]; /* device product number */ 89 char revision[BLK_REV_SIZE + 1]; /* firmware revision */ 90 enum sig_type sig_type; /* Partition table signature type */ 91 union { 92 uint32_t mbr_sig; /* MBR integer signature */ 93 efi_guid_t guid_sig; /* GPT GUID Signature */ 94 }; 95#if CONFIG_IS_ENABLED(BLK) 96 /* 97 * For now we have a few functions which take struct blk_desc as a 98 * parameter. This field allows them to look up the associated 99 * device. Once these functions are removed we can drop this field. 100 */ 101 struct udevice *bdev; 102#else 103 unsigned long (*block_read)(struct blk_desc *block_dev, 104 lbaint_t start, 105 lbaint_t blkcnt, 106 void *buffer); 107 unsigned long (*block_write)(struct blk_desc *block_dev, 108 lbaint_t start, 109 lbaint_t blkcnt, 110 const void *buffer); 111 unsigned long (*block_erase)(struct blk_desc *block_dev, 112 lbaint_t start, 113 lbaint_t blkcnt); 114 void *priv; /* driver private struct pointer */ 115#endif 116}; 117 118#define BLOCK_CNT(size, blk_desc) (PAD_COUNT(size, blk_desc->blksz)) 119#define PAD_TO_BLOCKSIZE(size, blk_desc) \ 120 (PAD_SIZE(size, blk_desc->blksz)) 121 122#if CONFIG_IS_ENABLED(BLOCK_CACHE) 123 124/** 125 * blkcache_init() - initialize the block cache list pointers 126 */ 127int blkcache_init(void); 128 129/** 130 * blkcache_read() - attempt to read a set of blocks from cache 131 * 132 * @param iftype - IF_TYPE_x for type of device 133 * @param dev - device index of particular type 134 * @param start - starting block number 135 * @param blkcnt - number of blocks to read 136 * @param blksz - size in bytes of each block 137 * @param buf - buffer to contain cached data 138 * 139 * @return - 1 if block returned from cache, 0 otherwise. 140 */ 141int blkcache_read(int iftype, int dev, 142 lbaint_t start, lbaint_t blkcnt, 143 unsigned long blksz, void *buffer); 144 145/** 146 * blkcache_fill() - make data read from a block device available 147 * to the block cache 148 * 149 * @param iftype - IF_TYPE_x for type of device 150 * @param dev - device index of particular type 151 * @param start - starting block number 152 * @param blkcnt - number of blocks available 153 * @param blksz - size in bytes of each block 154 * @param buf - buffer containing data to cache 155 * 156 */ 157void blkcache_fill(int iftype, int dev, 158 lbaint_t start, lbaint_t blkcnt, 159 unsigned long blksz, void const *buffer); 160 161/** 162 * blkcache_invalidate() - discard the cache for a set of blocks 163 * because of a write or device (re)initialization. 164 * 165 * @param iftype - IF_TYPE_x for type of device 166 * @param dev - device index of particular type 167 */ 168void blkcache_invalidate(int iftype, int dev); 169 170/** 171 * blkcache_configure() - configure block cache 172 * 173 * @param blocks - maximum blocks per entry 174 * @param entries - maximum entries in cache 175 */ 176void blkcache_configure(unsigned blocks, unsigned entries); 177 178/* 179 * statistics of the block cache 180 */ 181struct block_cache_stats { 182 unsigned hits; 183 unsigned misses; 184 unsigned entries; /* current entry count */ 185 unsigned max_blocks_per_entry; 186 unsigned max_entries; 187}; 188 189/** 190 * get_blkcache_stats() - return statistics and reset 191 * 192 * @param stats - statistics are copied here 193 */ 194void blkcache_stats(struct block_cache_stats *stats); 195 196#else 197 198static inline int blkcache_read(int iftype, int dev, 199 lbaint_t start, lbaint_t blkcnt, 200 unsigned long blksz, void *buffer) 201{ 202 return 0; 203} 204 205static inline void blkcache_fill(int iftype, int dev, 206 lbaint_t start, lbaint_t blkcnt, 207 unsigned long blksz, void const *buffer) {} 208 209static inline void blkcache_invalidate(int iftype, int dev) {} 210 211#endif 212 213#if CONFIG_IS_ENABLED(BLK) 214struct udevice; 215 216/* Operations on block devices */ 217struct blk_ops { 218 /** 219 * read() - read from a block device 220 * 221 * @dev: Device to read from 222 * @start: Start block number to read (0=first) 223 * @blkcnt: Number of blocks to read 224 * @buffer: Destination buffer for data read 225 * @return number of blocks read, or -ve error number (see the 226 * IS_ERR_VALUE() macro 227 */ 228 unsigned long (*read)(struct udevice *dev, lbaint_t start, 229 lbaint_t blkcnt, void *buffer); 230 231 /** 232 * write() - write to a block device 233 * 234 * @dev: Device to write to 235 * @start: Start block number to write (0=first) 236 * @blkcnt: Number of blocks to write 237 * @buffer: Source buffer for data to write 238 * @return number of blocks written, or -ve error number (see the 239 * IS_ERR_VALUE() macro 240 */ 241 unsigned long (*write)(struct udevice *dev, lbaint_t start, 242 lbaint_t blkcnt, const void *buffer); 243 244 /** 245 * erase() - erase a section of a block device 246 * 247 * @dev: Device to (partially) erase 248 * @start: Start block number to erase (0=first) 249 * @blkcnt: Number of blocks to erase 250 * @return number of blocks erased, or -ve error number (see the 251 * IS_ERR_VALUE() macro 252 */ 253 unsigned long (*erase)(struct udevice *dev, lbaint_t start, 254 lbaint_t blkcnt); 255 256 /** 257 * select_hwpart() - select a particular hardware partition 258 * 259 * Some devices (e.g. MMC) can support partitioning at the hardware 260 * level. This is quite separate from the normal idea of 261 * software-based partitions. MMC hardware partitions must be 262 * explicitly selected. Once selected only the region of the device 263 * covered by that partition is accessible. 264 * 265 * The MMC standard provides for two boot partitions (numbered 1 and 2), 266 * rpmb (3), and up to 4 addition general-purpose partitions (4-7). 267 * 268 * @desc: Block device to update 269 * @hwpart: Hardware partition number to select. 0 means the raw 270 * device, 1 is the first partition, 2 is the second, etc. 271 * @return 0 if OK, -ve on error 272 */ 273 int (*select_hwpart)(struct udevice *dev, int hwpart); 274}; 275 276#define blk_get_ops(dev) ((struct blk_ops *)(dev)->driver->ops) 277 278/* 279 * These functions should take struct udevice instead of struct blk_desc, 280 * but this is convenient for migration to driver model. Add a 'd' prefix 281 * to the function operations, so that blk_read(), etc. can be reserved for 282 * functions with the correct arguments. 283 */ 284unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start, 285 lbaint_t blkcnt, void *buffer); 286unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start, 287 lbaint_t blkcnt, const void *buffer); 288unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start, 289 lbaint_t blkcnt); 290 291/** 292 * blk_find_device() - Find a block device 293 * 294 * This function does not activate the device. The device will be returned 295 * whether or not it is activated. 296 * 297 * @if_type: Interface type (enum if_type_t) 298 * @devnum: Device number (specific to each interface type) 299 * @devp: the device, if found 300 * @return 0 if found, -ENODEV if no device found, or other -ve error value 301 */ 302int blk_find_device(int if_type, int devnum, struct udevice **devp); 303 304/** 305 * blk_get_device() - Find and probe a block device ready for use 306 * 307 * @if_type: Interface type (enum if_type_t) 308 * @devnum: Device number (specific to each interface type) 309 * @devp: the device, if found 310 * @return 0 if found, -ENODEV if no device found, or other -ve error value 311 */ 312int blk_get_device(int if_type, int devnum, struct udevice **devp); 313 314/** 315 * blk_first_device() - Find the first device for a given interface 316 * 317 * The device is probed ready for use 318 * 319 * @devnum: Device number (specific to each interface type) 320 * @devp: the device, if found 321 * @return 0 if found, -ENODEV if no device, or other -ve error value 322 */ 323int blk_first_device(int if_type, struct udevice **devp); 324 325/** 326 * blk_next_device() - Find the next device for a given interface 327 * 328 * This can be called repeatedly after blk_first_device() to iterate through 329 * all devices of the given interface type. 330 * 331 * The device is probed ready for use 332 * 333 * @devp: On entry, the previous device returned. On exit, the next 334 * device, if found 335 * @return 0 if found, -ENODEV if no device, or other -ve error value 336 */ 337int blk_next_device(struct udevice **devp); 338 339/** 340 * blk_create_device() - Create a new block device 341 * 342 * @parent: Parent of the new device 343 * @drv_name: Driver name to use for the block device 344 * @name: Name for the device 345 * @if_type: Interface type (enum if_type_t) 346 * @devnum: Device number, specific to the interface type, or -1 to 347 * allocate the next available number 348 * @blksz: Block size of the device in bytes (typically 512) 349 * @lba: Total number of blocks of the device 350 * @devp: the new device (which has not been probed) 351 */ 352int blk_create_device(struct udevice *parent, const char *drv_name, 353 const char *name, int if_type, int devnum, int blksz, 354 lbaint_t lba, struct udevice **devp); 355 356/** 357 * blk_create_devicef() - Create a new named block device 358 * 359 * @parent: Parent of the new device 360 * @drv_name: Driver name to use for the block device 361 * @name: Name for the device (parent name is prepended) 362 * @if_type: Interface type (enum if_type_t) 363 * @devnum: Device number, specific to the interface type, or -1 to 364 * allocate the next available number 365 * @blksz: Block size of the device in bytes (typically 512) 366 * @lba: Total number of blocks of the device 367 * @devp: the new device (which has not been probed) 368 */ 369int blk_create_devicef(struct udevice *parent, const char *drv_name, 370 const char *name, int if_type, int devnum, int blksz, 371 lbaint_t lba, struct udevice **devp); 372 373/** 374 * blk_probe_or_unbind() - Try to probe 375 * 376 * Try to probe the device, primarily for enumerating partitions. 377 * If it fails, the device itself is unbound since it means that it won't 378 * work any more. 379 * 380 * @dev: The device to probe 381 * Return: 0 if OK, -ve on error 382 */ 383int blk_probe_or_unbind(struct udevice *dev); 384 385/** 386 * blk_unbind_all() - Unbind all device of the given interface type 387 * 388 * The devices are removed and then unbound. 389 * 390 * @if_type: Interface type to unbind 391 * @return 0 if OK, -ve on error 392 */ 393int blk_unbind_all(int if_type); 394 395/** 396 * blk_find_max_devnum() - find the maximum device number for an interface type 397 * 398 * Finds the last allocated device number for an interface type @if_type. The 399 * next number is safe to use for a newly allocated device. 400 * 401 * @if_type: Interface type to scan 402 * @return maximum device number found, or -ENODEV if none, or other -ve on 403 * error 404 */ 405int blk_find_max_devnum(enum if_type if_type); 406 407/** 408 * blk_next_free_devnum() - get the next device number for an interface type 409 * 410 * Finds the next number that is safe to use for a newly allocated device for 411 * an interface type @if_type. 412 * 413 * @if_type: Interface type to scan 414 * @return next device number safe to use, or -ve on error 415 */ 416int blk_next_free_devnum(enum if_type if_type); 417 418/** 419 * blk_select_hwpart() - select a hardware partition 420 * 421 * Select a hardware partition if the device supports it (typically MMC does) 422 * 423 * @dev: Device to update 424 * @hwpart: Partition number to select 425 * @return 0 if OK, -ve on error 426 */ 427int blk_select_hwpart(struct udevice *dev, int hwpart); 428 429/** 430 * blk_get_from_parent() - obtain a block device by looking up its parent 431 * 432 * All devices with 433 */ 434int blk_get_from_parent(struct udevice *parent, struct udevice **devp); 435 436/** 437 * blk_get_by_device() - Get the block device descriptor for the given device 438 * @dev: Instance of a storage device 439 * 440 * Return: With block device descriptor on success , NULL if there is no such 441 * block device. 442 */ 443struct blk_desc *blk_get_by_device(struct udevice *dev); 444 445#else 446#include <errno.h> 447/* 448 * These functions should take struct udevice instead of struct blk_desc, 449 * but this is convenient for migration to driver model. Add a 'd' prefix 450 * to the function operations, so that blk_read(), etc. can be reserved for 451 * functions with the correct arguments. 452 */ 453static inline ulong blk_dread(struct blk_desc *block_dev, lbaint_t start, 454 lbaint_t blkcnt, void *buffer) 455{ 456 ulong blks_read; 457 if (blkcache_read(block_dev->if_type, block_dev->devnum, 458 start, blkcnt, block_dev->blksz, buffer)) 459 return blkcnt; 460 461 /* 462 * We could check if block_read is NULL and return -ENOSYS. But this 463 * bloats the code slightly (cause some board to fail to build), and 464 * it would be an error to try an operation that does not exist. 465 */ 466 blks_read = block_dev->block_read(block_dev, start, blkcnt, buffer); 467 if (blks_read == blkcnt) 468 blkcache_fill(block_dev->if_type, block_dev->devnum, 469 start, blkcnt, block_dev->blksz, buffer); 470 471 return blks_read; 472} 473 474static inline ulong blk_dwrite(struct blk_desc *block_dev, lbaint_t start, 475 lbaint_t blkcnt, const void *buffer) 476{ 477 blkcache_invalidate(block_dev->if_type, block_dev->devnum); 478 return block_dev->block_write(block_dev, start, blkcnt, buffer); 479} 480 481static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start, 482 lbaint_t blkcnt) 483{ 484 blkcache_invalidate(block_dev->if_type, block_dev->devnum); 485 return block_dev->block_erase(block_dev, start, blkcnt); 486} 487 488/** 489 * struct blk_driver - Driver for block interface types 490 * 491 * This provides access to the block devices for each interface type. One 492 * driver should be provided using U_BOOT_LEGACY_BLK() for each interface 493 * type that is to be supported. 494 * 495 * @if_typename: Interface type name 496 * @if_type: Interface type 497 * @max_devs: Maximum number of devices supported 498 * @desc: Pointer to list of devices for this interface type, 499 * or NULL to use @get_dev() instead 500 */ 501struct blk_driver { 502 const char *if_typename; 503 enum if_type if_type; 504 int max_devs; 505 struct blk_desc *desc; 506 /** 507 * get_dev() - get a pointer to a block device given its number 508 * 509 * Each interface allocates its own devices and typically 510 * struct blk_desc is contained with the interface's data structure. 511 * There is no global numbering for block devices. This method allows 512 * the device for an interface type to be obtained when @desc is NULL. 513 * 514 * @devnum: Device number (0 for first device on that interface, 515 * 1 for second, etc. 516 * @descp: Returns pointer to the block device on success 517 * @return 0 if OK, -ve on error 518 */ 519 int (*get_dev)(int devnum, struct blk_desc **descp); 520 521 /** 522 * select_hwpart() - Select a hardware partition 523 * 524 * Some devices (e.g. MMC) can support partitioning at the hardware 525 * level. This is quite separate from the normal idea of 526 * software-based partitions. MMC hardware partitions must be 527 * explicitly selected. Once selected only the region of the device 528 * covered by that partition is accessible. 529 * 530 * The MMC standard provides for two boot partitions (numbered 1 and 2), 531 * rpmb (3), and up to 4 addition general-purpose partitions (4-7). 532 * Partition 0 is the main user-data partition. 533 * 534 * @desc: Block device descriptor 535 * @hwpart: Hardware partition number to select. 0 means the main 536 * user-data partition, 1 is the first partition, 2 is 537 * the second, etc. 538 * @return 0 if OK, other value for an error 539 */ 540 int (*select_hwpart)(struct blk_desc *desc, int hwpart); 541}; 542 543/* 544 * Declare a new U-Boot legacy block driver. New drivers should use driver 545 * model (UCLASS_BLK). 546 */ 547#define U_BOOT_LEGACY_BLK(__name) \ 548 ll_entry_declare(struct blk_driver, __name, blk_driver) 549 550struct blk_driver *blk_driver_lookup_type(int if_type); 551 552#endif /* !CONFIG_BLK */ 553 554/** 555 * blk_get_devnum_by_typename() - Get a block device by type and number 556 * 557 * This looks through the available block devices of the given type, returning 558 * the one with the given @devnum. 559 * 560 * @if_type: Block device type 561 * @devnum: Device number 562 * @return point to block device descriptor, or NULL if not found 563 */ 564struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum); 565 566/** 567 * blk_get_devnum_by_type() - Get a block device by type name, and number 568 * 569 * This looks up the block device type based on @if_typename, then calls 570 * blk_get_devnum_by_type(). 571 * 572 * @if_typename: Block device type name 573 * @devnum: Device number 574 * @return point to block device descriptor, or NULL if not found 575 */ 576struct blk_desc *blk_get_devnum_by_typename(const char *if_typename, 577 int devnum); 578 579/** 580 * blk_dselect_hwpart() - select a hardware partition 581 * 582 * This selects a hardware partition (such as is supported by MMC). The block 583 * device size may change as this effectively points the block device to a 584 * partition at the hardware level. See the select_hwpart() method above. 585 * 586 * @desc: Block device descriptor for the device to select 587 * @hwpart: Partition number to select 588 * @return 0 if OK, -ve on error 589 */ 590int blk_dselect_hwpart(struct blk_desc *desc, int hwpart); 591 592/** 593 * blk_list_part() - list the partitions for block devices of a given type 594 * 595 * This looks up the partition type for each block device of type @if_type, 596 * then displays a list of partitions. 597 * 598 * @if_type: Block device type 599 * @return 0 if OK, -ENODEV if there is none of that type 600 */ 601int blk_list_part(enum if_type if_type); 602 603/** 604 * blk_list_devices() - list the block devices of a given type 605 * 606 * This lists each block device of the type @if_type, showing the capacity 607 * as well as type-specific information. 608 * 609 * @if_type: Block device type 610 */ 611void blk_list_devices(enum if_type if_type); 612 613/** 614 * blk_show_device() - show information about a given block device 615 * 616 * This shows the block device capacity as well as type-specific information. 617 * 618 * @if_type: Block device type 619 * @devnum: Device number 620 * @return 0 if OK, -ENODEV for invalid device number 621 */ 622int blk_show_device(enum if_type if_type, int devnum); 623 624/** 625 * blk_print_device_num() - show information about a given block device 626 * 627 * This is similar to blk_show_device() but returns an error if the block 628 * device type is unknown. 629 * 630 * @if_type: Block device type 631 * @devnum: Device number 632 * @return 0 if OK, -ENODEV for invalid device number, -ENOENT if the block 633 * device is not connected 634 */ 635int blk_print_device_num(enum if_type if_type, int devnum); 636 637/** 638 * blk_print_part_devnum() - print the partition information for a device 639 * 640 * @if_type: Block device type 641 * @devnum: Device number 642 * @return 0 if OK, -ENOENT if the block device is not connected, -ENOSYS if 643 * the interface type is not supported, other -ve on other error 644 */ 645int blk_print_part_devnum(enum if_type if_type, int devnum); 646 647/** 648 * blk_read_devnum() - read blocks from a device 649 * 650 * @if_type: Block device type 651 * @devnum: Device number 652 * @blkcnt: Number of blocks to read 653 * @buffer: Address to write data to 654 * @return number of blocks read, or -ve error number on error 655 */ 656ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start, 657 lbaint_t blkcnt, void *buffer); 658 659/** 660 * blk_write_devnum() - write blocks to a device 661 * 662 * @if_type: Block device type 663 * @devnum: Device number 664 * @blkcnt: Number of blocks to write 665 * @buffer: Address to read data from 666 * @return number of blocks written, or -ve error number on error 667 */ 668ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start, 669 lbaint_t blkcnt, const void *buffer); 670 671/** 672 * blk_select_hwpart_devnum() - select a hardware partition 673 * 674 * This is similar to blk_dselect_hwpart() but it looks up the interface and 675 * device number. 676 * 677 * @if_type: Block device type 678 * @devnum: Device number 679 * @hwpart: Partition number to select 680 * @return 0 if OK, -ve on error 681 */ 682int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart); 683 684/** 685 * blk_get_if_type_name() - Get the name of an interface type 686 * 687 * @if_type: Interface type to check 688 * @return name of interface, or NULL if none 689 */ 690const char *blk_get_if_type_name(enum if_type if_type); 691 692/** 693 * blk_common_cmd() - handle common commands with block devices 694 * 695 * @args: Number of arguments to the command (argv[0] is the command itself) 696 * @argv: Command arguments 697 * @if_type: Interface type 698 * @cur_devnump: Current device number for this interface type 699 * @return 0 if OK, CMD_RET_ERROR on error 700 */ 701int blk_common_cmd(int argc, char *const argv[], enum if_type if_type, 702 int *cur_devnump); 703 704enum blk_flag_t { 705 BLKF_FIXED = 1 << 0, 706 BLKF_REMOVABLE = 1 << 1, 707 BLKF_BOTH = BLKF_FIXED | BLKF_REMOVABLE, 708}; 709 710/** 711 * blk_first_device_err() - Get the first block device 712 * 713 * The device returned is probed if necessary, and ready for use 714 * 715 * @flags: Indicates type of device to return 716 * @devp: Returns pointer to the first device in that uclass, or NULL if none 717 * @return 0 if found, -ENODEV if not found, other -ve on error 718 */ 719int blk_first_device_err(enum blk_flag_t flags, struct udevice **devp); 720 721/** 722 * blk_next_device_err() - Get the next block device 723 * 724 * The device returned is probed if necessary, and ready for use 725 * 726 * @flags: Indicates type of device to return 727 * @devp: On entry, pointer to device to lookup. On exit, returns pointer 728 * to the next device in the uclass if no error occurred, or -ENODEV if 729 * there is no next device. 730 * @return 0 if found, -ENODEV if not found, other -ve on error 731 */ 732int blk_next_device_err(enum blk_flag_t flags, struct udevice **devp); 733 734/** 735 * blk_foreach_probe() - Helper function to iteration through block devices 736 * 737 * This creates a for() loop which works through the available devices in 738 * a uclass in order from start to end. Devices are probed if necessary, 739 * and ready for use. 740 * 741 * @flags: Indicates type of device to return 742 * @dev: struct udevice * to hold the current device. Set to NULL when there 743 * are no more devices. 744 */ 745#define blk_foreach_probe(flags, pos) \ 746 for (int _ret = blk_first_device_err(flags, &(pos)); \ 747 !_ret && pos; \ 748 _ret = blk_next_device_err(flags, &(pos))) 749 750/** 751 * blk_count_devices() - count the number of devices of a particular type 752 * 753 * @flags: Indicates type of device to find 754 * @return number of devices matching those flags 755 */ 756int blk_count_devices(enum blk_flag_t flag); 757 758#endif 759