include/blk.h

   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_get_device() - Find and probe a block device ready for use
 257  *
 258  * @if_type:    Interface type (enum if_type_t)
 259  * @devnum:     Device number (specific to each interface type)
 260  * @devp:       the device, if found
 261  * @return - if found, -ENODEV if no device found, or other -ve error value
 262  */
 263 int blk_get_device(int if_type, int devnum, struct udevice **devp);
 264
 265 /**
 266  * blk_first_device() - Find the first device for a given interface
 267  *
 268  * The device is probed ready for use
 269  *
 270  * @devnum:     Device number (specific to each interface type)
 271  * @devp:       the device, if found
 272  * @return 0 if found, -ENODEV if no device, or other -ve error value
 273  */
 274 int blk_first_device(int if_type, struct udevice **devp);
 275
 276 /**
 277  * blk_next_device() - Find the next device for a given interface
 278  *
 279  * This can be called repeatedly after blk_first_device() to iterate through
 280  * all devices of the given interface type.
 281  *
 282  * The device is probed ready for use
 283  *
 284  * @devp:       On entry, the previous device returned. On exit, the next
 285  *              device, if found
 286  * @return 0 if found, -ENODEV if no device, or other -ve error value
 287  */
 288 int blk_next_device(struct udevice **devp);
 289
 290 /**
 291  * blk_create_device() - Create a new block device
 292  *
 293  * @parent:     Parent of the new device
 294  * @drv_name:   Driver name to use for the block device
 295  * @name:       Name for the device
 296  * @if_type:    Interface type (enum if_type_t)
 297  * @devnum:     Device number, specific to the interface type, or -1 to
 298  *              allocate the next available number
 299  * @blksz:      Block size of the device in bytes (typically 512)
 300  * @size:       Total size of the device in bytes
 301  * @devp:       the new device (which has not been probed)
 302  */
 303 int blk_create_device(struct udevice *parent, const char *drv_name,
 304                       const char *name, int if_type, int devnum, int blksz,
 305                       lbaint_t size, struct udevice **devp);
 306
 307 /**
 308  * blk_create_devicef() - Create a new named block device
 309  *
 310  * @parent:     Parent of the new device
 311  * @drv_name:   Driver name to use for the block device
 312  * @name:       Name for the device (parent name is prepended)
 313  * @if_type:    Interface type (enum if_type_t)
 314  * @devnum:     Device number, specific to the interface type, or -1 to
 315  *              allocate the next available number
 316  * @blksz:      Block size of the device in bytes (typically 512)
 317  * @size:       Total size of the device in bytes
 318  * @devp:       the new device (which has not been probed)
 319  */
 320 int blk_create_devicef(struct udevice *parent, const char *drv_name,
 321                        const char *name, int if_type, int devnum, int blksz,
 322                        lbaint_t size, struct udevice **devp);
 323
 324 /**
 325  * blk_prepare_device() - Prepare a block device for use
 326  *
 327  * This reads partition information from the device if supported.
 328  *
 329  * @dev:        Device to prepare
 330  * @return 0 if ok, -ve on error
 331  */
 332 int blk_prepare_device(struct udevice *dev);
 333
 334 /**
 335  * blk_unbind_all() - Unbind all device of the given interface type
 336  *
 337  * The devices are removed and then unbound.
 338  *
 339  * @if_type:    Interface type to unbind
 340  * @return 0 if OK, -ve on error
 341  */
 342 int blk_unbind_all(int if_type);
 343
 344 /**
 345  * blk_find_max_devnum() - find the maximum device number for an interface type
 346  *
 347  * Finds the last allocated device number for an interface type @if_type. The
 348  * next number is safe to use for a newly allocated device.
 349  *
 350  * @if_type:    Interface type to scan
 351  * @return maximum device number found, or -ENODEV if none, or other -ve on
 352  * error
 353  */
 354 int blk_find_max_devnum(enum if_type if_type);
 355
 356 /**
 357  * blk_select_hwpart() - select a hardware partition
 358  *
 359  * Select a hardware partition if the device supports it (typically MMC does)
 360  *
 361  * @dev:        Device to update
 362  * @hwpart:     Partition number to select
 363  * @return 0 if OK, -ve on error
 364  */
 365 int blk_select_hwpart(struct udevice *dev, int hwpart);
 366
 367 #else
 368 #include <errno.h>
 369 /*
 370  * These functions should take struct udevice instead of struct blk_desc,
 371  * but this is convenient for migration to driver model. Add a 'd' prefix
 372  * to the function operations, so that blk_read(), etc. can be reserved for
 373  * functions with the correct arguments.
 374  */
 375 static inline ulong blk_dread(struct blk_desc *block_dev, lbaint_t start,
 376                               lbaint_t blkcnt, void *buffer)
 377 {
 378         ulong blks_read;
 379         if (blkcache_read(block_dev->if_type, block_dev->devnum,
 380                           start, blkcnt, block_dev->blksz, buffer))
 381                 return blkcnt;
 382
 383         /*
 384          * We could check if block_read is NULL and return -ENOSYS. But this
 385          * bloats the code slightly (cause some board to fail to build), and
 386          * it would be an error to try an operation that does not exist.
 387          */
 388         blks_read = block_dev->block_read(block_dev, start, blkcnt, buffer);
 389         if (blks_read == blkcnt)
 390                 blkcache_fill(block_dev->if_type, block_dev->devnum,
 391                               start, blkcnt, block_dev->blksz, buffer);
 392
 393         return blks_read;
 394 }
 395
 396 static inline ulong blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
 397                                lbaint_t blkcnt, const void *buffer)
 398 {
 399         blkcache_invalidate(block_dev->if_type, block_dev->devnum);
 400         return block_dev->block_write(block_dev, start, blkcnt, buffer);
 401 }
 402
 403 static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start,
 404                                lbaint_t blkcnt)
 405 {
 406         blkcache_invalidate(block_dev->if_type, block_dev->devnum);
 407         return block_dev->block_erase(block_dev, start, blkcnt);
 408 }
 409
 410 /**
 411  * struct blk_driver - Driver for block interface types
 412  *
 413  * This provides access to the block devices for each interface type. One
 414  * driver should be provided using U_BOOT_LEGACY_BLK() for each interface
 415  * type that is to be supported.
 416  *
 417  * @if_typename:        Interface type name
 418  * @if_type:            Interface type
 419  * @max_devs:           Maximum number of devices supported
 420  * @desc:               Pointer to list of devices for this interface type,
 421  *                      or NULL to use @get_dev() instead
 422  */
 423 struct blk_driver {
 424         const char *if_typename;
 425         enum if_type if_type;
 426         int max_devs;
 427         struct blk_desc *desc;
 428         /**
 429          * get_dev() - get a pointer to a block device given its number
 430          *
 431          * Each interface allocates its own devices and typically
 432          * struct blk_desc is contained with the interface's data structure.
 433          * There is no global numbering for block devices. This method allows
 434          * the device for an interface type to be obtained when @desc is NULL.
 435          *
 436          * @devnum:     Device number (0 for first device on that interface,
 437          *              1 for second, etc.
 438          * @descp:      Returns pointer to the block device on success
 439          * @return 0 if OK, -ve on error
 440          */
 441         int (*get_dev)(int devnum, struct blk_desc **descp);
 442
 443         /**
 444          * select_hwpart() - Select a hardware partition
 445          *
 446          * Some devices (e.g. MMC) can support partitioning at the hardware
 447          * level. This is quite separate from the normal idea of
 448          * software-based partitions. MMC hardware partitions must be
 449          * explicitly selected. Once selected only the region of the device
 450          * covered by that partition is accessible.
 451          *
 452          * The MMC standard provides for two boot partitions (numbered 1 and 2),
 453          * rpmb (3), and up to 4 addition general-purpose partitions (4-7).
 454          * Partition 0 is the main user-data partition.
 455          *
 456          * @desc:       Block device descriptor
 457          * @hwpart:     Hardware partition number to select. 0 means the main
 458          *              user-data partition, 1 is the first partition, 2 is
 459          *              the second, etc.
 460          * @return 0 if OK, other value for an error
 461          */
 462         int (*select_hwpart)(struct blk_desc *desc, int hwpart);
 463 };
 464
 465 /*
 466  * Declare a new U-Boot legacy block driver. New drivers should use driver
 467  * model (UCLASS_BLK).
 468  */
 469 #define U_BOOT_LEGACY_BLK(__name)                                       \
 470         ll_entry_declare(struct blk_driver, __name, blk_driver)
 471
 472 struct blk_driver *blk_driver_lookup_type(int if_type);
 473
 474 #endif /* !CONFIG_BLK */
 475
 476 /**
 477  * blk_get_devnum_by_typename() - Get a block device by type and number
 478  *
 479  * This looks through the available block devices of the given type, returning
 480  * the one with the given @devnum.
 481  *
 482  * @if_type:    Block device type
 483  * @devnum:     Device number
 484  * @return point to block device descriptor, or NULL if not found
 485  */
 486 struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum);
 487
 488 /**
 489  * blk_get_devnum_by_type() - Get a block device by type name, and number
 490  *
 491  * This looks up the block device type based on @if_typename, then calls
 492  * blk_get_devnum_by_type().
 493  *
 494  * @if_typename:        Block device type name
 495  * @devnum:             Device number
 496  * @return point to block device descriptor, or NULL if not found
 497  */
 498 struct blk_desc *blk_get_devnum_by_typename(const char *if_typename,
 499                                             int devnum);
 500
 501 /**
 502  * blk_dselect_hwpart() - select a hardware partition
 503  *
 504  * This selects a hardware partition (such as is supported by MMC). The block
 505  * device size may change as this effectively points the block device to a
 506  * partition at the hardware level. See the select_hwpart() method above.
 507  *
 508  * @desc:       Block device descriptor for the device to select
 509  * @hwpart:     Partition number to select
 510  * @return 0 if OK, -ve on error
 511  */
 512 int blk_dselect_hwpart(struct blk_desc *desc, int hwpart);
 513
 514 /**
 515  * blk_list_part() - list the partitions for block devices of a given type
 516  *
 517  * This looks up the partition type for each block device of type @if_type,
 518  * then displays a list of partitions.
 519  *
 520  * @if_type:    Block device type
 521  * @return 0 if OK, -ENODEV if there is none of that type
 522  */
 523 int blk_list_part(enum if_type if_type);
 524
 525 /**
 526  * blk_list_devices() - list the block devices of a given type
 527  *
 528  * This lists each block device of the type @if_type, showing the capacity
 529  * as well as type-specific information.
 530  *
 531  * @if_type:    Block device type
 532  */
 533 void blk_list_devices(enum if_type if_type);
 534
 535 /**
 536  * blk_show_device() - show information about a given block device
 537  *
 538  * This shows the block device capacity as well as type-specific information.
 539  *
 540  * @if_type:    Block device type
 541  * @devnum:     Device number
 542  * @return 0 if OK, -ENODEV for invalid device number
 543  */
 544 int blk_show_device(enum if_type if_type, int devnum);
 545
 546 /**
 547  * blk_print_device_num() - show information about a given block device
 548  *
 549  * This is similar to blk_show_device() but returns an error if the block
 550  * device type is unknown.
 551  *
 552  * @if_type:    Block device type
 553  * @devnum:     Device number
 554  * @return 0 if OK, -ENODEV for invalid device number, -ENOENT if the block
 555  * device is not connected
 556  */
 557 int blk_print_device_num(enum if_type if_type, int devnum);
 558
 559 /**
 560  * blk_print_part_devnum() - print the partition information for a device
 561  *
 562  * @if_type:    Block device type
 563  * @devnum:     Device number
 564  * @return 0 if OK, -ENOENT if the block device is not connected, -ENOSYS if
 565  * the interface type is not supported, other -ve on other error
 566  */
 567 int blk_print_part_devnum(enum if_type if_type, int devnum);
 568
 569 /**
 570  * blk_read_devnum() - read blocks from a device
 571  *
 572  * @if_type:    Block device type
 573  * @devnum:     Device number
 574  * @blkcnt:     Number of blocks to read
 575  * @buffer:     Address to write data to
 576  * @return number of blocks read, or -ve error number on error
 577  */
 578 ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start,
 579                       lbaint_t blkcnt, void *buffer);
 580
 581 /**
 582  * blk_write_devnum() - write blocks to a device
 583  *
 584  * @if_type:    Block device type
 585  * @devnum:     Device number
 586  * @blkcnt:     Number of blocks to write
 587  * @buffer:     Address to read data from
 588  * @return number of blocks written, or -ve error number on error
 589  */
 590 ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start,
 591                        lbaint_t blkcnt, const void *buffer);
 592
 593 /**
 594  * blk_select_hwpart_devnum() - select a hardware partition
 595  *
 596  * This is similar to blk_dselect_hwpart() but it looks up the interface and
 597  * device number.
 598  *
 599  * @if_type:    Block device type
 600  * @devnum:     Device number
 601  * @hwpart:     Partition number to select
 602  * @return 0 if OK, -ve on error
 603  */
 604 int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart);
 605
 606 #endif