common/cmd_sf.c

   1 /*
   2  * Command for accessing SPI flash.
   3  *
   4  * Copyright (C) 2008 Atmel Corporation
   5  * Licensed under the GPL-2 or later.
   6  */
   7
   8 #include <div64.h>
   9 #include <common.h>
  10 #include <malloc.h>
  11 #include <spi_flash.h>
  12
  13 #include <asm/io.h>
  14
  15 #ifndef CONFIG_SF_DEFAULT_SPEED
  16 # define CONFIG_SF_DEFAULT_SPEED        1000000
  17 #endif
  18 #ifndef CONFIG_SF_DEFAULT_MODE
  19 # define CONFIG_SF_DEFAULT_MODE         SPI_MODE_3
  20 #endif
  21 #ifndef CONFIG_SF_DEFAULT_CS
  22 # define CONFIG_SF_DEFAULT_CS           0
  23 #endif
  24 #ifndef CONFIG_SF_DEFAULT_BUS
  25 # define CONFIG_SF_DEFAULT_BUS          0
  26 #endif
  27
  28 static struct spi_flash *flash;
  29
  30
  31 /*
  32  * This function computes the length argument for the erase command.
  33  * The length on which the command is to operate can be given in two forms:
  34  * 1. <cmd> offset len  - operate on <'offset',  'len')
  35  * 2. <cmd> offset +len - operate on <'offset',  'round_up(len)')
  36  * If the second form is used and the length doesn't fall on the
  37  * sector boundary, than it will be adjusted to the next sector boundary.
  38  * If it isn't in the flash, the function will fail (return -1).
  39  * Input:
  40  *    arg: length specification (i.e. both command arguments)
  41  * Output:
  42  *    len: computed length for operation
  43  * Return:
  44  *    1: success
  45  *   -1: failure (bad format, bad address).
  46  */
  47 static int sf_parse_len_arg(char *arg, ulong *len)
  48 {
  49         char *ep;
  50         char round_up_len; /* indicates if the "+length" form used */
  51         ulong len_arg;
  52
  53         round_up_len = 0;
  54         if (*arg == '+') {
  55                 round_up_len = 1;
  56                 ++arg;
  57         }
  58
  59         len_arg = simple_strtoul(arg, &ep, 16);
  60         if (ep == arg || *ep != '\0')
  61                 return -1;
  62
  63         if (round_up_len && flash->sector_size > 0)
  64                 *len = ROUND(len_arg, flash->sector_size);
  65         else
  66                 *len = len_arg;
  67
  68         return 1;
  69 }
  70
  71 /**
  72  * This function takes a byte length and a delta unit of time to compute the
  73  * approximate bytes per second
  74  *
  75  * @param len           amount of bytes currently processed
  76  * @param start_ms      start time of processing in ms
  77  * @return bytes per second if OK, 0 on error
  78  */
  79 static ulong bytes_per_second(unsigned int len, ulong start_ms)
  80 {
  81         /* less accurate but avoids overflow */
  82         if (len >= ((unsigned int) -1) / 1024)
  83                 return len / (max(get_timer(start_ms) / 1024, 1));
  84         else
  85                 return 1024 * len / max(get_timer(start_ms), 1);
  86 }
  87
  88 static int do_spi_flash_probe(int argc, char * const argv[])
  89 {
  90         unsigned int bus = CONFIG_SF_DEFAULT_BUS;
  91         unsigned int cs = CONFIG_SF_DEFAULT_CS;
  92         unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
  93         unsigned int mode = CONFIG_SF_DEFAULT_MODE;
  94         char *endp;
  95         struct spi_flash *new;
  96
  97         if (argc >= 2) {
  98                 cs = simple_strtoul(argv[1], &endp, 0);
  99                 if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
 100                         return -1;
 101                 if (*endp == ':') {
 102                         if (endp[1] == 0)
 103                                 return -1;
 104
 105                         bus = cs;
 106                         cs = simple_strtoul(endp + 1, &endp, 0);
 107                         if (*endp != 0)
 108                                 return -1;
 109                 }
 110         }
 111
 112         if (argc >= 3) {
 113                 speed = simple_strtoul(argv[2], &endp, 0);
 114                 if (*argv[2] == 0 || *endp != 0)
 115                         return -1;
 116         }
 117         if (argc >= 4) {
 118                 mode = simple_strtoul(argv[3], &endp, 16);
 119                 if (*argv[3] == 0 || *endp != 0)
 120                         return -1;
 121         }
 122
 123         new = spi_flash_probe(bus, cs, speed, mode);
 124         if (!new) {
 125                 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
 126                 return 1;
 127         }
 128
 129         if (flash)
 130                 spi_flash_free(flash);
 131         flash = new;
 132
 133         return 0;
 134 }
 135
 136 /**
 137  * Write a block of data to SPI flash, first checking if it is different from
 138  * what is already there.
 139  *
 140  * If the data being written is the same, then *skipped is incremented by len.
 141  *
 142  * @param flash         flash context pointer
 143  * @param offset        flash offset to write
 144  * @param len           number of bytes to write
 145  * @param buf           buffer to write from
 146  * @param cmp_buf       read buffer to use to compare data
 147  * @param skipped       Count of skipped data (incremented by this function)
 148  * @return NULL if OK, else a string containing the stage which failed
 149  */
 150 static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
 151                 size_t len, const char *buf, char *cmp_buf, size_t *skipped)
 152 {
 153         debug("offset=%#x, sector_size=%#x, len=%#zx\n",
 154                 offset, flash->sector_size, len);
 155         if (spi_flash_read(flash, offset, len, cmp_buf))
 156                 return "read";
 157         if (memcmp(cmp_buf, buf, len) == 0) {
 158                 debug("Skip region %x size %zx: no change\n",
 159                         offset, len);
 160                 *skipped += len;
 161                 return NULL;
 162         }
 163         if (spi_flash_erase(flash, offset, len))
 164                 return "erase";
 165         if (spi_flash_write(flash, offset, len, buf))
 166                 return "write";
 167         return NULL;
 168 }
 169
 170 /**
 171  * Update an area of SPI flash by erasing and writing any blocks which need
 172  * to change. Existing blocks with the correct data are left unchanged.
 173  *
 174  * @param flash         flash context pointer
 175  * @param offset        flash offset to write
 176  * @param len           number of bytes to write
 177  * @param buf           buffer to write from
 178  * @return 0 if ok, 1 on error
 179  */
 180 static int spi_flash_update(struct spi_flash *flash, u32 offset,
 181                 size_t len, const char *buf)
 182 {
 183         const char *err_oper = NULL;
 184         char *cmp_buf;
 185         const char *end = buf + len;
 186         size_t todo;            /* number of bytes to do in this pass */
 187         size_t skipped = 0;     /* statistics */
 188         const ulong start_time = get_timer(0);
 189         size_t scale = 1;
 190         const char *start_buf = buf;
 191         ulong delta;
 192
 193         if (end - buf >= 200)
 194                 scale = (end - buf) / 100;
 195         cmp_buf = malloc(flash->sector_size);
 196         if (cmp_buf) {
 197                 ulong last_update = get_timer(0);
 198
 199                 for (; buf < end && !err_oper; buf += todo, offset += todo) {
 200                         todo = min(end - buf, flash->sector_size);
 201                         if (get_timer(last_update) > 100) {
 202                                 printf("   \rUpdating, %zu%% %lu B/s",
 203                                         100 - (end - buf) / scale,
 204                                         bytes_per_second(buf - start_buf,
 205                                                          start_time));
 206                                 last_update = get_timer(0);
 207                         }
 208                         err_oper = spi_flash_update_block(flash, offset, todo,
 209                                         buf, cmp_buf, &skipped);
 210                 }
 211         } else {
 212                 err_oper = "malloc";
 213         }
 214         free(cmp_buf);
 215         putc('\r');
 216         if (err_oper) {
 217                 printf("SPI flash failed in %s step\n", err_oper);
 218                 return 1;
 219         }
 220
 221         delta = get_timer(start_time);
 222         printf("%zu bytes written, %zu bytes skipped", len - skipped,
 223                 skipped);
 224         printf(" in %ld.%lds, speed %ld B/s\n",
 225                 delta / 1000, delta % 1000, bytes_per_second(len, start_time));
 226
 227         return 0;
 228 }
 229
 230 static int do_spi_flash_read_write(int argc, char * const argv[])
 231 {
 232         unsigned long addr;
 233         unsigned long offset;
 234         unsigned long len;
 235         void *buf;
 236         char *endp;
 237         int ret;
 238
 239         if (argc < 4)
 240                 return -1;
 241
 242         addr = simple_strtoul(argv[1], &endp, 16);
 243         if (*argv[1] == 0 || *endp != 0)
 244                 return -1;
 245         offset = simple_strtoul(argv[2], &endp, 16);
 246         if (*argv[2] == 0 || *endp != 0)
 247                 return -1;
 248         len = simple_strtoul(argv[3], &endp, 16);
 249         if (*argv[3] == 0 || *endp != 0)
 250                 return -1;
 251
 252         /* Consistency checking */
 253         if (offset + len > flash->size) {
 254                 printf("ERROR: attempting %s past flash size (%#x)\n",
 255                         argv[0], flash->size);
 256                 return 1;
 257         }
 258
 259         buf = map_physmem(addr, len, MAP_WRBACK);
 260         if (!buf) {
 261                 puts("Failed to map physical memory\n");
 262                 return 1;
 263         }
 264
 265         if (strcmp(argv[0], "update") == 0)
 266                 ret = spi_flash_update(flash, offset, len, buf);
 267         else if (strcmp(argv[0], "read") == 0)
 268                 ret = spi_flash_read(flash, offset, len, buf);
 269         else
 270                 ret = spi_flash_write(flash, offset, len, buf);
 271
 272         unmap_physmem(buf, len);
 273
 274         if (ret) {
 275                 printf("SPI flash %s failed\n", argv[0]);
 276                 return 1;
 277         }
 278
 279         return 0;
 280 }
 281
 282 static int do_spi_flash_erase(int argc, char * const argv[])
 283 {
 284         unsigned long offset;
 285         unsigned long len;
 286         char *endp;
 287         int ret;
 288
 289         if (argc < 3)
 290                 return -1;
 291
 292         offset = simple_strtoul(argv[1], &endp, 16);
 293         if (*argv[1] == 0 || *endp != 0)
 294                 return -1;
 295
 296         ret = sf_parse_len_arg(argv[2], &len);
 297         if (ret != 1)
 298                 return -1;
 299
 300         /* Consistency checking */
 301         if (offset + len > flash->size) {
 302                 printf("ERROR: attempting %s past flash size (%#x)\n",
 303                         argv[0], flash->size);
 304                 return 1;
 305         }
 306
 307         ret = spi_flash_erase(flash, offset, len);
 308         if (ret) {
 309                 printf("SPI flash %s failed\n", argv[0]);
 310                 return 1;
 311         }
 312
 313         return 0;
 314 }
 315
 316 #ifdef CONFIG_CMD_SF_TEST
 317 enum {
 318         STAGE_ERASE,
 319         STAGE_CHECK,
 320         STAGE_WRITE,
 321         STAGE_READ,
 322
 323         STAGE_COUNT,
 324 };
 325
 326 static char *stage_name[STAGE_COUNT] = {
 327         "erase",
 328         "check",
 329         "write",
 330         "read",
 331 };
 332
 333 struct test_info {
 334         int stage;
 335         int bytes;
 336         unsigned base_ms;
 337         unsigned time_ms[STAGE_COUNT];
 338 };
 339
 340 static void show_time(struct test_info *test, int stage)
 341 {
 342         uint64_t speed; /* KiB/s */
 343         int bps;        /* Bits per second */
 344
 345         speed = (long long)test->bytes * 1000;
 346         do_div(speed, test->time_ms[stage] * 1024);
 347         bps = speed * 8;
 348
 349         printf("%d %s: %d ticks, %d KiB/s %d.%03d Mbps\n", stage,
 350                stage_name[stage], test->time_ms[stage],
 351                (int)speed, bps / 1000, bps % 1000);
 352 }
 353
 354 static void spi_test_next_stage(struct test_info *test)
 355 {
 356         test->time_ms[test->stage] = get_timer(test->base_ms);
 357         show_time(test, test->stage);
 358         test->base_ms = get_timer(0);
 359         test->stage++;
 360 }
 361
 362 /**
 363  * Run a test on the SPI flash
 364  *
 365  * @param flash         SPI flash to use
 366  * @param buf           Source buffer for data to write
 367  * @param len           Size of data to read/write
 368  * @param offset        Offset within flash to check
 369  * @param vbuf          Verification buffer
 370  * @return 0 if ok, -1 on error
 371  */
 372 static int spi_flash_test(struct spi_flash *flash, char *buf, ulong len,
 373                            ulong offset, char *vbuf)
 374 {
 375         struct test_info test;
 376         int i;
 377
 378         printf("SPI flash test:\n");
 379         memset(&test, '\0', sizeof(test));
 380         test.base_ms = get_timer(0);
 381         test.bytes = len;
 382         if (spi_flash_erase(flash, offset, len)) {
 383                 printf("Erase failed\n");
 384                 return -1;
 385         }
 386         spi_test_next_stage(&test);
 387
 388         if (spi_flash_read(flash, offset, len, vbuf)) {
 389                 printf("Check read failed\n");
 390                 return -1;
 391         }
 392         for (i = 0; i < len; i++) {
 393                 if (vbuf[i] != 0xff) {
 394                         printf("Check failed at %d\n", i);
 395                         print_buffer(i, vbuf + i, 1, min(len - i, 0x40), 0);
 396                         return -1;
 397                 }
 398         }
 399         spi_test_next_stage(&test);
 400
 401         if (spi_flash_write(flash, offset, len, buf)) {
 402                 printf("Write failed\n");
 403                 return -1;
 404         }
 405         memset(vbuf, '\0', len);
 406         spi_test_next_stage(&test);
 407
 408         if (spi_flash_read(flash, offset, len, vbuf)) {
 409                 printf("Read failed\n");
 410                 return -1;
 411         }
 412         spi_test_next_stage(&test);
 413
 414         for (i = 0; i < len; i++) {
 415                 if (buf[i] != vbuf[i]) {
 416                         printf("Verify failed at %d, good data:\n", i);
 417                         print_buffer(i, buf + i, 1, min(len - i, 0x40), 0);
 418                         printf("Bad data:\n");
 419                         print_buffer(i, vbuf + i, 1, min(len - i, 0x40), 0);
 420                         return -1;
 421                 }
 422         }
 423         printf("Test passed\n");
 424         for (i = 0; i < STAGE_COUNT; i++)
 425                 show_time(&test, i);
 426
 427         return 0;
 428 }
 429
 430 static int do_spi_flash_test(int argc, char * const argv[])
 431 {
 432         unsigned long offset;
 433         unsigned long len;
 434         char *buf = (char *)CONFIG_SYS_TEXT_BASE;
 435         char *endp;
 436         char *vbuf;
 437         int ret;
 438
 439         offset = simple_strtoul(argv[1], &endp, 16);
 440         if (*argv[1] == 0 || *endp != 0)
 441                 return -1;
 442         len = simple_strtoul(argv[2], &endp, 16);
 443         if (*argv[2] == 0 || *endp != 0)
 444                 return -1;
 445
 446         vbuf = malloc(len);
 447         if (!vbuf) {
 448                 printf("Cannot allocate memory\n");
 449                 return 1;
 450         }
 451         buf = malloc(len);
 452         if (!buf) {
 453                 free(vbuf);
 454                 printf("Cannot allocate memory\n");
 455                 return 1;
 456         }
 457
 458         memcpy(buf, (char *)CONFIG_SYS_TEXT_BASE, len);
 459         ret = spi_flash_test(flash, buf, len, offset, vbuf);
 460         free(vbuf);
 461         free(buf);
 462         if (ret) {
 463                 printf("Test failed\n");
 464                 return 1;
 465         }
 466
 467         return 0;
 468 }
 469 #endif /* CONFIG_CMD_SF_TEST */
 470
 471 static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 472 {
 473         const char *cmd;
 474         int ret;
 475
 476         /* need at least two arguments */
 477         if (argc < 2)
 478                 goto usage;
 479
 480         cmd = argv[1];
 481         --argc;
 482         ++argv;
 483
 484         if (strcmp(cmd, "probe") == 0) {
 485                 ret = do_spi_flash_probe(argc, argv);
 486                 goto done;
 487         }
 488
 489         /* The remaining commands require a selected device */
 490         if (!flash) {
 491                 puts("No SPI flash selected. Please run `sf probe'\n");
 492                 return 1;
 493         }
 494
 495         if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
 496             strcmp(cmd, "update") == 0)
 497                 ret = do_spi_flash_read_write(argc, argv);
 498         else if (strcmp(cmd, "erase") == 0)
 499                 ret = do_spi_flash_erase(argc, argv);
 500 #ifdef CONFIG_CMD_SF_TEST
 501         else if (!strcmp(cmd, "test"))
 502                 ret = do_spi_flash_test(argc, argv);
 503 #endif
 504         else
 505                 ret = -1;
 506
 507 done:
 508         if (ret != -1)
 509                 return ret;
 510
 511 usage:
 512         return CMD_RET_USAGE;
 513 }
 514
 515 #ifdef CONFIG_CMD_SF_TEST
 516 #define SF_TEST_HELP "\nsf test offset len              " \
 517                 "- run a very basic destructive test"
 518 #else
 519 #define SF_TEST_HELP
 520 #endif
 521
 522 U_BOOT_CMD(
 523         sf,     5,      1,      do_spi_flash,
 524         "SPI flash sub-system",
 525         "probe [[bus:]cs] [hz] [mode]   - init flash device on given SPI bus\n"
 526         "                                 and chip select\n"
 527         "sf read addr offset len        - read `len' bytes starting at\n"
 528         "                                 `offset' to memory at `addr'\n"
 529         "sf write addr offset len       - write `len' bytes from memory\n"
 530         "                                 at `addr' to flash at `offset'\n"
 531         "sf erase offset [+]len         - erase `len' bytes from `offset'\n"
 532         "                                 `+len' round up `len' to block size\n"
 533         "sf update addr offset len      - erase and write `len' bytes from memory\n"
 534         "                                 at `addr' to flash at `offset'"
 535         SF_TEST_HELP
 536 );