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