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_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 /**
 381  * blk_get_from_parent() - obtain a block device by looking up its parent
 382  *
 383  * All devices with
 384  */
 385 int blk_get_from_parent(struct udevice *parent, struct udevice **devp);
 386
 387 #else
 388 #include <errno.h>
 389 /*
 390  * These functions should take struct udevice instead of struct blk_desc,
 391  * but this is convenient for migration to driver model. Add a 'd' prefix
 392  * to the function operations, so that blk_read(), etc. can be reserved for
 393  * functions with the correct arguments.
 394  */
 395 static inline ulong blk_dread(struct blk_desc *block_dev, lbaint_t start,
 396                               lbaint_t blkcnt, void *buffer)
 397 {
 398         ulong blks_read;
 399         if (blkcache_read(block_dev->if_type, block_dev->devnum,
 400                           start, blkcnt, block_dev->blksz, buffer))
 401                 return blkcnt;
 402
 403         /*
 404          * We could check if block_read is NULL and return -ENOSYS. But this
 405          * bloats the code slightly (cause some board to fail to build), and
 406          * it would be an error to try an operation that does not exist.
 407          */
 408         blks_read = block_dev->block_read(block_dev, start, blkcnt, buffer);
 409         if (blks_read == blkcnt)
 410                 blkcache_fill(block_dev->if_type, block_dev->devnum,
 411                               start, blkcnt, block_dev->blksz, buffer);
 412
 413         return blks_read;
 414 }
 415
 416 static inline ulong blk_dwrite(struct blk_desc *block_dev, lbaint_t start,
 417                                lbaint_t blkcnt, const void *buffer)
 418 {
 419         blkcache_invalidate(block_dev->if_type, block_dev->devnum);
 420         return block_dev->block_write(block_dev, start, blkcnt, buffer);
 421 }
 422
 423 static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start,
 424                                lbaint_t blkcnt)
 425 {
 426         blkcache_invalidate(block_dev->if_type, block_dev->devnum);
 427         return block_dev->block_erase(block_dev, start, blkcnt);
 428 }
 429
 430 /**
 431  * struct blk_driver - Driver for block interface types
 432  *
 433  * This provides access to the block devices for each interface type. One
 434  * driver should be provided using U_BOOT_LEGACY_BLK() for each interface
 435  * type that is to be supported.
 436  *
 437  * @if_typename:        Interface type name
 438  * @if_type:            Interface type
 439  * @max_devs:           Maximum number of devices supported
 440  * @desc:               Pointer to list of devices for this interface type,
 441  *                      or NULL to use @get_dev() instead
 442  */
 443 struct blk_driver {
 444         const char *if_typename;
 445         enum if_type if_type;
 446         int max_devs;
 447         struct blk_desc *desc;
 448         /**
 449          * get_dev() - get a pointer to a block device given its number
 450          *
 451          * Each interface allocates its own devices and typically
 452          * struct blk_desc is contained with the interface's data structure.
 453          * There is no global numbering for block devices. This method allows
 454          * the device for an interface type to be obtained when @desc is NULL.
 455          *
 456          * @devnum:     Device number (0 for first device on that interface,
 457          *              1 for second, etc.
 458          * @descp:      Returns pointer to the block device on success
 459          * @return 0 if OK, -ve on error
 460          */
 461         int (*get_dev)(int devnum, struct blk_desc **descp);
 462
 463         /**
 464          * select_hwpart() - Select a hardware partition
 465          *
 466          * Some devices (e.g. MMC) can support partitioning at the hardware
 467          * level. This is quite separate from the normal idea of
 468          * software-based partitions. MMC hardware partitions must be
 469          * explicitly selected. Once selected only the region of the device
 470          * covered by that partition is accessible.
 471          *
 472          * The MMC standard provides for two boot partitions (numbered 1 and 2),
 473          * rpmb (3), and up to 4 addition general-purpose partitions (4-7).
 474          * Partition 0 is the main user-data partition.
 475          *
 476          * @desc:       Block device descriptor
 477          * @hwpart:     Hardware partition number to select. 0 means the main
 478          *              user-data partition, 1 is the first partition, 2 is
 479          *              the second, etc.
 480          * @return 0 if OK, other value for an error
 481          */
 482         int (*select_hwpart)(struct blk_desc *desc, int hwpart);
 483 };
 484
 485 /*
 486  * Declare a new U-Boot legacy block driver. New drivers should use driver
 487  * model (UCLASS_BLK).
 488  */
 489 #define U_BOOT_LEGACY_BLK(__name)                                       \
 490         ll_entry_declare(struct blk_driver, __name, blk_driver)
 491
 492 struct blk_driver *blk_driver_lookup_type(int if_type);
 493
 494 #endif /* !CONFIG_BLK */
 495
 496 /**
 497  * blk_get_devnum_by_typename() - Get a block device by type and number
 498  *
 499  * This looks through the available block devices of the given type, returning
 500  * the one with the given @devnum.
 501  *
 502  * @if_type:    Block device type
 503  * @devnum:     Device number
 504  * @return point to block device descriptor, or NULL if not found
 505  */
 506 struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum);
 507
 508 /**
 509  * blk_get_devnum_by_type() - Get a block device by type name, and number
 510  *
 511  * This looks up the block device type based on @if_typename, then calls
 512  * blk_get_devnum_by_type().
 513  *
 514  * @if_typename:        Block device type name
 515  * @devnum:             Device number
 516  * @return point to block device descriptor, or NULL if not found
 517  */
 518 struct blk_desc *blk_get_devnum_by_typename(const char *if_typename,
 519                                             int devnum);
 520
 521 /**
 522  * blk_dselect_hwpart() - select a hardware partition
 523  *
 524  * This selects a hardware partition (such as is supported by MMC). The block
 525  * device size may change as this effectively points the block device to a
 526  * partition at the hardware level. See the select_hwpart() method above.
 527  *
 528  * @desc:       Block device descriptor for the device to select
 529  * @hwpart:     Partition number to select
 530  * @return 0 if OK, -ve on error
 531  */
 532 int blk_dselect_hwpart(struct blk_desc *desc, int hwpart);
 533
 534 /**
 535  * blk_list_part() - list the partitions for block devices of a given type
 536  *
 537  * This looks up the partition type for each block device of type @if_type,
 538  * then displays a list of partitions.
 539  *
 540  * @if_type:    Block device type
 541  * @return 0 if OK, -ENODEV if there is none of that type
 542  */
 543 int blk_list_part(enum if_type if_type);
 544
 545 /**
 546  * blk_list_devices() - list the block devices of a given type
 547  *
 548  * This lists each block device of the type @if_type, showing the capacity
 549  * as well as type-specific information.
 550  *
 551  * @if_type:    Block device type
 552  */
 553 void blk_list_devices(enum if_type if_type);
 554
 555 /**
 556  * blk_show_device() - show information about a given block device
 557  *
 558  * This shows the block device capacity as well as type-specific information.
 559  *
 560  * @if_type:    Block device type
 561  * @devnum:     Device number
 562  * @return 0 if OK, -ENODEV for invalid device number
 563  */
 564 int blk_show_device(enum if_type if_type, int devnum);
 565
 566 /**
 567  * blk_print_device_num() - show information about a given block device
 568  *
 569  * This is similar to blk_show_device() but returns an error if the block
 570  * device type is unknown.
 571  *
 572  * @if_type:    Block device type
 573  * @devnum:     Device number
 574  * @return 0 if OK, -ENODEV for invalid device number, -ENOENT if the block
 575  * device is not connected
 576  */
 577 int blk_print_device_num(enum if_type if_type, int devnum);
 578
 579 /**
 580  * blk_print_part_devnum() - print the partition information for a device
 581  *
 582  * @if_type:    Block device type
 583  * @devnum:     Device number
 584  * @return 0 if OK, -ENOENT if the block device is not connected, -ENOSYS if
 585  * the interface type is not supported, other -ve on other error
 586  */
 587 int blk_print_part_devnum(enum if_type if_type, int devnum);
 588
 589 /**
 590  * blk_read_devnum() - read blocks from a device
 591  *
 592  * @if_type:    Block device type
 593  * @devnum:     Device number
 594  * @blkcnt:     Number of blocks to read
 595  * @buffer:     Address to write data to
 596  * @return number of blocks read, or -ve error number on error
 597  */
 598 ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start,
 599                       lbaint_t blkcnt, void *buffer);
 600
 601 /**
 602  * blk_write_devnum() - write blocks to a device
 603  *
 604  * @if_type:    Block device type
 605  * @devnum:     Device number
 606  * @blkcnt:     Number of blocks to write
 607  * @buffer:     Address to read data from
 608  * @return number of blocks written, or -ve error number on error
 609  */
 610 ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start,
 611                        lbaint_t blkcnt, const void *buffer);
 612
 613 /**
 614  * blk_select_hwpart_devnum() - select a hardware partition
 615  *
 616  * This is similar to blk_dselect_hwpart() but it looks up the interface and
 617  * device number.
 618  *
 619  * @if_type:    Block device type
 620  * @devnum:     Device number
 621  * @hwpart:     Partition number to select
 622  * @return 0 if OK, -ve on error
 623  */
 624 int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart);
 625
 626 #endif