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 34 IF_TYPE_COUNT, /* Number of interface types */ 35 }; 36 37 /* 38 * With driver model (CONFIG_BLK) this is uclass platform data, accessible 39 * with dev_get_uclass_platdata(dev) 40 */ 41 struct blk_desc { 42 /* 43 * TODO: With driver model we should be able to use the parent 44 * device's uclass instead. 45 */ 46 enum if_type if_type; /* type of the interface */ 47 int devnum; /* device number */ 48 unsigned char part_type; /* partition type */ 49 unsigned char target; /* target SCSI ID */ 50 unsigned char lun; /* target LUN */ 51 unsigned char hwpart; /* HW partition, e.g. for eMMC */ 52 unsigned char type; /* device type */ 53 unsigned char removable; /* removable device */ 54 #ifdef CONFIG_LBA48 55 /* device can use 48bit addr (ATA/ATAPI v7) */ 56 unsigned char lba48; 57 #endif 58 lbaint_t lba; /* number of blocks */ 59 unsigned long blksz; /* block size */ 60 int log2blksz; /* for convenience: log2(blksz) */ 61 char vendor[40+1]; /* IDE model, SCSI Vendor */ 62 char product[20+1]; /* IDE Serial no, SCSI product */ 63 char revision[8+1]; /* firmware revision */ 64 #ifdef CONFIG_BLK 65 struct udevice *bdev; 66 #else 67 unsigned long (*block_read)(struct blk_desc *block_dev, 68 lbaint_t start, 69 lbaint_t blkcnt, 70 void *buffer); 71 unsigned long (*block_write)(struct blk_desc *block_dev, 72 lbaint_t start, 73 lbaint_t blkcnt, 74 const void *buffer); 75 unsigned long (*block_erase)(struct blk_desc *block_dev, 76 lbaint_t start, 77 lbaint_t blkcnt); 78 void *priv; /* driver private struct pointer */ 79 #endif 80 }; 81 82 #define BLOCK_CNT(size, blk_desc) (PAD_COUNT(size, blk_desc->blksz)) 83 #define PAD_TO_BLOCKSIZE(size, blk_desc) \ 84 (PAD_SIZE(size, blk_desc->blksz)) 85 86 #ifdef CONFIG_BLOCK_CACHE 87 /** 88 * blkcache_read() - attempt to read a set of blocks from cache 89 * 90 * @param iftype - IF_TYPE_x for type of device 91 * @param dev - device index of particular type 92 * @param start - starting block number 93 * @param blkcnt - number of blocks to read 94 * @param blksz - size in bytes of each block 95 * @param buf - buffer to contain cached data 96 * 97 * @return - '1' if block returned from cache, '0' otherwise. 98 */ 99 int blkcache_read(int iftype, int dev, 100 lbaint_t start, lbaint_t blkcnt, 101 unsigned long blksz, void *buffer); 102 103 /** 104 * blkcache_fill() - make data read from a block device available 105 * to the block cache 106 * 107 * @param iftype - IF_TYPE_x for type of device 108 * @param dev - device index of particular type 109 * @param start - starting block number 110 * @param blkcnt - number of blocks available 111 * @param blksz - size in bytes of each block 112 * @param buf - buffer containing data to cache 113 * 114 */ 115 void blkcache_fill(int iftype, int dev, 116 lbaint_t start, lbaint_t blkcnt, 117 unsigned long blksz, void const *buffer); 118 119 /** 120 * blkcache_invalidate() - discard the cache for a set of blocks 121 * because of a write or device (re)initialization. 122 * 123 * @param iftype - IF_TYPE_x for type of device 124 * @param dev - device index of particular type 125 */ 126 void blkcache_invalidate(int iftype, int dev); 127 128 /** 129 * blkcache_configure() - configure block cache 130 * 131 * @param blocks - maximum blocks per entry 132 * @param entries - maximum entries in cache 133 */ 134 void blkcache_configure(unsigned blocks, unsigned entries); 135 136 /* 137 * statistics of the block cache 138 */ 139 struct block_cache_stats { 140 unsigned hits; 141 unsigned misses; 142 unsigned entries; /* current entry count */ 143 unsigned max_blocks_per_entry; 144 unsigned max_entries; 145 }; 146 147 /** 148 * get_blkcache_stats() - return statistics and reset 149 * 150 * @param stats - statistics are copied here 151 */ 152 void blkcache_stats(struct block_cache_stats *stats); 153 154 #else 155 156 static inline int blkcache_read(int iftype, int dev, 157 lbaint_t start, lbaint_t blkcnt, 158 unsigned long blksz, void *buffer) 159 { 160 return 0; 161 } 162 163 static inline void blkcache_fill(int iftype, int dev, 164 lbaint_t start, lbaint_t blkcnt, 165 unsigned long blksz, void const *buffer) {} 166 167 static inline void blkcache_invalidate(int iftype, int dev) {} 168 169 #endif 170 171 #ifdef CONFIG_BLK 172 struct udevice; 173 174 /* Operations on block devices */ 175 struct blk_ops { 176 /** 177 * read() - read from a block device 178 * 179 * @dev: Device to read from 180 * @start: Start block number to read (0=first) 181 * @blkcnt: Number of blocks to read 182 * @buffer: Destination buffer for data read 183 * @return number of blocks read, or -ve error number (see the 184 * IS_ERR_VALUE() macro 185 */ 186 unsigned long (*read)(struct udevice *dev, lbaint_t start, 187 lbaint_t blkcnt, void *buffer); 188 189 /** 190 * write() - write to a block device 191 * 192 * @dev: Device to write to 193 * @start: Start block number to write (0=first) 194 * @blkcnt: Number of blocks to write 195 * @buffer: Source buffer for data to write 196 * @return number of blocks written, or -ve error number (see the 197 * IS_ERR_VALUE() macro 198 */ 199 unsigned long (*write)(struct udevice *dev, lbaint_t start, 200 lbaint_t blkcnt, const void *buffer); 201 202 /** 203 * erase() - erase a section of a block device 204 * 205 * @dev: Device to (partially) erase 206 * @start: Start block number to erase (0=first) 207 * @blkcnt: Number of blocks to erase 208 * @return number of blocks erased, or -ve error number (see the 209 * IS_ERR_VALUE() macro 210 */ 211 unsigned long (*erase)(struct udevice *dev, lbaint_t start, 212 lbaint_t blkcnt); 213 }; 214 215 #define blk_get_ops(dev) ((struct blk_ops *)(dev)->driver->ops) 216 217 /* 218 * These functions should take struct udevice instead of struct blk_desc, 219 * but this is convenient for migration to driver model. Add a 'd' prefix 220 * to the function operations, so that blk_read(), etc. can be reserved for 221 * functions with the correct arguments. 222 */ 223 unsigned long blk_dread(struct blk_desc *block_dev, lbaint_t start, 224 lbaint_t blkcnt, void *buffer); 225 unsigned long blk_dwrite(struct blk_desc *block_dev, lbaint_t start, 226 lbaint_t blkcnt, const void *buffer); 227 unsigned long blk_derase(struct blk_desc *block_dev, lbaint_t start, 228 lbaint_t blkcnt); 229 230 /** 231 * blk_get_device() - Find and probe a block device ready for use 232 * 233 * @if_type: Interface type (enum if_type_t) 234 * @devnum: Device number (specific to each interface type) 235 * @devp: the device, if found 236 * @return - if found, -ENODEV if no device found, or other -ve error value 237 */ 238 int blk_get_device(int if_type, int devnum, struct udevice **devp); 239 240 /** 241 * blk_first_device() - Find the first device for a given interface 242 * 243 * The device is probed ready for use 244 * 245 * @devnum: Device number (specific to each interface type) 246 * @devp: the device, if found 247 * @return 0 if found, -ENODEV if no device, or other -ve error value 248 */ 249 int blk_first_device(int if_type, struct udevice **devp); 250 251 /** 252 * blk_next_device() - Find the next device for a given interface 253 * 254 * This can be called repeatedly after blk_first_device() to iterate through 255 * all devices of the given interface type. 256 * 257 * The device is probed ready for use 258 * 259 * @devp: On entry, the previous device returned. On exit, the next 260 * device, if found 261 * @return 0 if found, -ENODEV if no device, or other -ve error value 262 */ 263 int blk_next_device(struct udevice **devp); 264 265 /** 266 * blk_create_device() - Create a new block device 267 * 268 * @parent: Parent of the new device 269 * @drv_name: Driver name to use for the block device 270 * @name: Name for the device 271 * @if_type: Interface type (enum if_type_t) 272 * @devnum: Device number, specific to the interface type 273 * @blksz: Block size of the device in bytes (typically 512) 274 * @size: Total size of the device in bytes 275 * @devp: the new device (which has not been probed) 276 */ 277 int blk_create_device(struct udevice *parent, const char *drv_name, 278 const char *name, int if_type, int devnum, int blksz, 279 lbaint_t size, struct udevice **devp); 280 281 /** 282 * blk_prepare_device() - Prepare a block device for use 283 * 284 * This reads partition information from the device if supported. 285 * 286 * @dev: Device to prepare 287 * @return 0 if ok, -ve on error 288 */ 289 int blk_prepare_device(struct udevice *dev); 290 291 /** 292 * blk_unbind_all() - Unbind all device of the given interface type 293 * 294 * The devices are removed and then unbound. 295 * 296 * @if_type: Interface type to unbind 297 * @return 0 if OK, -ve on error 298 */ 299 int blk_unbind_all(int if_type); 300 301 #else 302 #include <errno.h> 303 /* 304 * These functions should take struct udevice instead of struct blk_desc, 305 * but this is convenient for migration to driver model. Add a 'd' prefix 306 * to the function operations, so that blk_read(), etc. can be reserved for 307 * functions with the correct arguments. 308 */ 309 static inline ulong blk_dread(struct blk_desc *block_dev, lbaint_t start, 310 lbaint_t blkcnt, void *buffer) 311 { 312 ulong blks_read; 313 if (blkcache_read(block_dev->if_type, block_dev->devnum, 314 start, blkcnt, block_dev->blksz, buffer)) 315 return blkcnt; 316 317 /* 318 * We could check if block_read is NULL and return -ENOSYS. But this 319 * bloats the code slightly (cause some board to fail to build), and 320 * it would be an error to try an operation that does not exist. 321 */ 322 blks_read = block_dev->block_read(block_dev, start, blkcnt, buffer); 323 if (blks_read == blkcnt) 324 blkcache_fill(block_dev->if_type, block_dev->devnum, 325 start, blkcnt, block_dev->blksz, buffer); 326 327 return blks_read; 328 } 329 330 static inline ulong blk_dwrite(struct blk_desc *block_dev, lbaint_t start, 331 lbaint_t blkcnt, const void *buffer) 332 { 333 blkcache_invalidate(block_dev->if_type, block_dev->devnum); 334 return block_dev->block_write(block_dev, start, blkcnt, buffer); 335 } 336 337 static inline ulong blk_derase(struct blk_desc *block_dev, lbaint_t start, 338 lbaint_t blkcnt) 339 { 340 blkcache_invalidate(block_dev->if_type, block_dev->devnum); 341 return block_dev->block_erase(block_dev, start, blkcnt); 342 } 343 #endif /* !CONFIG_BLK */ 344 345 #endif 346