1 /* 2 * SPI flash interface 3 * 4 * Copyright (C) 2008 Atmel Corporation 5 * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik 6 * 7 * Licensed under the GPL-2 or later. 8 */ 9 10 #include <common.h> 11 #include <malloc.h> 12 #include <spi.h> 13 #include <spi_flash.h> 14 15 #include "spi_flash_internal.h" 16 17 static void spi_flash_addr(u32 addr, u8 *cmd) 18 { 19 /* cmd[0] is actual command */ 20 cmd[1] = addr >> 16; 21 cmd[2] = addr >> 8; 22 cmd[3] = addr >> 0; 23 } 24 25 static int spi_flash_read_write(struct spi_slave *spi, 26 const u8 *cmd, size_t cmd_len, 27 const u8 *data_out, u8 *data_in, 28 size_t data_len) 29 { 30 unsigned long flags = SPI_XFER_BEGIN; 31 int ret; 32 33 if (data_len == 0) 34 flags |= SPI_XFER_END; 35 36 ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags); 37 if (ret) { 38 debug("SF: Failed to send command (%zu bytes): %d\n", 39 cmd_len, ret); 40 } else if (data_len != 0) { 41 ret = spi_xfer(spi, data_len * 8, data_out, data_in, SPI_XFER_END); 42 if (ret) 43 debug("SF: Failed to transfer %zu bytes of data: %d\n", 44 data_len, ret); 45 } 46 47 return ret; 48 } 49 50 int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len) 51 { 52 return spi_flash_cmd_read(spi, &cmd, 1, response, len); 53 } 54 55 int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd, 56 size_t cmd_len, void *data, size_t data_len) 57 { 58 return spi_flash_read_write(spi, cmd, cmd_len, NULL, data, data_len); 59 } 60 61 int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len, 62 const void *data, size_t data_len) 63 { 64 return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len); 65 } 66 67 int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd, 68 size_t cmd_len, void *data, size_t data_len) 69 { 70 struct spi_slave *spi = flash->spi; 71 int ret; 72 73 spi_claim_bus(spi); 74 ret = spi_flash_cmd_read(spi, cmd, cmd_len, data, data_len); 75 spi_release_bus(spi); 76 77 return ret; 78 } 79 80 int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset, 81 size_t len, void *data) 82 { 83 u8 cmd[5]; 84 85 cmd[0] = CMD_READ_ARRAY_FAST; 86 spi_flash_addr(offset, cmd); 87 cmd[4] = 0x00; 88 89 return spi_flash_read_common(flash, cmd, sizeof(cmd), data, len); 90 } 91 92 int spi_flash_cmd_poll_bit(struct spi_flash *flash, unsigned long timeout, 93 u8 cmd, u8 poll_bit) 94 { 95 struct spi_slave *spi = flash->spi; 96 unsigned long timebase; 97 int ret; 98 u8 status; 99 100 ret = spi_xfer(spi, 8, &cmd, NULL, SPI_XFER_BEGIN); 101 if (ret) { 102 debug("SF: Failed to send command %02x: %d\n", cmd, ret); 103 return ret; 104 } 105 106 timebase = get_timer(0); 107 do { 108 ret = spi_xfer(spi, 8, NULL, &status, 0); 109 if (ret) 110 return -1; 111 112 if ((status & poll_bit) == 0) 113 break; 114 115 } while (get_timer(timebase) < timeout); 116 117 spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END); 118 119 if ((status & poll_bit) == 0) 120 return 0; 121 122 /* Timed out */ 123 debug("SF: time out!\n"); 124 return -1; 125 } 126 127 int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout) 128 { 129 return spi_flash_cmd_poll_bit(flash, timeout, 130 CMD_READ_STATUS, STATUS_WIP); 131 } 132 133 int spi_flash_cmd_erase(struct spi_flash *flash, u8 erase_cmd, 134 u32 offset, size_t len) 135 { 136 u32 start, end, erase_size; 137 int ret; 138 u8 cmd[4]; 139 140 erase_size = flash->sector_size; 141 if (offset % erase_size || len % erase_size) { 142 debug("SF: Erase offset/length not multiple of erase size\n"); 143 return -1; 144 } 145 146 ret = spi_claim_bus(flash->spi); 147 if (ret) { 148 debug("SF: Unable to claim SPI bus\n"); 149 return ret; 150 } 151 152 cmd[0] = erase_cmd; 153 start = offset; 154 end = start + len; 155 156 while (offset < end) { 157 spi_flash_addr(offset, cmd); 158 offset += erase_size; 159 160 debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1], 161 cmd[2], cmd[3], offset); 162 163 ret = spi_flash_cmd(flash->spi, CMD_WRITE_ENABLE, NULL, 0); 164 if (ret) 165 goto out; 166 167 ret = spi_flash_cmd_write(flash->spi, cmd, sizeof(cmd), NULL, 0); 168 if (ret) 169 goto out; 170 171 ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PAGE_ERASE_TIMEOUT); 172 if (ret) 173 goto out; 174 } 175 176 debug("SF: Successfully erased %lu bytes @ %#x\n", 177 len * erase_size, start); 178 179 out: 180 spi_release_bus(flash->spi); 181 return ret; 182 } 183 184 /* 185 * The following table holds all device probe functions 186 * 187 * shift: number of continuation bytes before the ID 188 * idcode: the expected IDCODE or 0xff for non JEDEC devices 189 * probe: the function to call 190 * 191 * Non JEDEC devices should be ordered in the table such that 192 * the probe functions with best detection algorithms come first. 193 * 194 * Several matching entries are permitted, they will be tried 195 * in sequence until a probe function returns non NULL. 196 * 197 * IDCODE_CONT_LEN may be redefined if a device needs to declare a 198 * larger "shift" value. IDCODE_PART_LEN generally shouldn't be 199 * changed. This is the max number of bytes probe functions may 200 * examine when looking up part-specific identification info. 201 * 202 * Probe functions will be given the idcode buffer starting at their 203 * manu id byte (the "idcode" in the table below). In other words, 204 * all of the continuation bytes will be skipped (the "shift" below). 205 */ 206 #define IDCODE_CONT_LEN 0 207 #define IDCODE_PART_LEN 5 208 static const struct { 209 const u8 shift; 210 const u8 idcode; 211 struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode); 212 } flashes[] = { 213 /* Keep it sorted by define name */ 214 #ifdef CONFIG_SPI_FLASH_ATMEL 215 { 0, 0x1f, spi_flash_probe_atmel, }, 216 #endif 217 #ifdef CONFIG_SPI_FLASH_EON 218 { 0, 0x1c, spi_flash_probe_eon, }, 219 #endif 220 #ifdef CONFIG_SPI_FLASH_MACRONIX 221 { 0, 0xc2, spi_flash_probe_macronix, }, 222 #endif 223 #ifdef CONFIG_SPI_FLASH_SPANSION 224 { 0, 0x01, spi_flash_probe_spansion, }, 225 #endif 226 #ifdef CONFIG_SPI_FLASH_SST 227 { 0, 0xbf, spi_flash_probe_sst, }, 228 #endif 229 #ifdef CONFIG_SPI_FLASH_STMICRO 230 { 0, 0x20, spi_flash_probe_stmicro, }, 231 #endif 232 #ifdef CONFIG_SPI_FLASH_WINBOND 233 { 0, 0xef, spi_flash_probe_winbond, }, 234 #endif 235 #ifdef CONFIG_SPI_FRAM_RAMTRON 236 { 6, 0xc2, spi_fram_probe_ramtron, }, 237 # undef IDCODE_CONT_LEN 238 # define IDCODE_CONT_LEN 6 239 #endif 240 /* Keep it sorted by best detection */ 241 #ifdef CONFIG_SPI_FLASH_STMICRO 242 { 0, 0xff, spi_flash_probe_stmicro, }, 243 #endif 244 #ifdef CONFIG_SPI_FRAM_RAMTRON_NON_JEDEC 245 { 0, 0xff, spi_fram_probe_ramtron, }, 246 #endif 247 }; 248 #define IDCODE_LEN (IDCODE_CONT_LEN + IDCODE_PART_LEN) 249 250 struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs, 251 unsigned int max_hz, unsigned int spi_mode) 252 { 253 struct spi_slave *spi; 254 struct spi_flash *flash = NULL; 255 int ret, i, shift; 256 u8 idcode[IDCODE_LEN], *idp; 257 258 spi = spi_setup_slave(bus, cs, max_hz, spi_mode); 259 if (!spi) { 260 printf("SF: Failed to set up slave\n"); 261 return NULL; 262 } 263 264 ret = spi_claim_bus(spi); 265 if (ret) { 266 debug("SF: Failed to claim SPI bus: %d\n", ret); 267 goto err_claim_bus; 268 } 269 270 /* Read the ID codes */ 271 ret = spi_flash_cmd(spi, CMD_READ_ID, idcode, sizeof(idcode)); 272 if (ret) 273 goto err_read_id; 274 275 #ifdef DEBUG 276 printf("SF: Got idcodes\n"); 277 print_buffer(0, idcode, 1, sizeof(idcode), 0); 278 #endif 279 280 /* count the number of continuation bytes */ 281 for (shift = 0, idp = idcode; 282 shift < IDCODE_CONT_LEN && *idp == 0x7f; 283 ++shift, ++idp) 284 continue; 285 286 /* search the table for matches in shift and id */ 287 for (i = 0; i < ARRAY_SIZE(flashes); ++i) 288 if (flashes[i].shift == shift && flashes[i].idcode == *idp) { 289 /* we have a match, call probe */ 290 flash = flashes[i].probe(spi, idp); 291 if (flash) 292 break; 293 } 294 295 if (!flash) { 296 printf("SF: Unsupported manufacturer %02x\n", *idp); 297 goto err_manufacturer_probe; 298 } 299 300 printf("SF: Detected %s with page size ", flash->name); 301 print_size(flash->sector_size, ", total "); 302 print_size(flash->size, "\n"); 303 304 spi_release_bus(spi); 305 306 return flash; 307 308 err_manufacturer_probe: 309 err_read_id: 310 spi_release_bus(spi); 311 err_claim_bus: 312 spi_free_slave(spi); 313 return NULL; 314 } 315 316 void spi_flash_free(struct spi_flash *flash) 317 { 318 spi_free_slave(flash->spi); 319 free(flash); 320 } 321