common/cmd_sf.c

   1 /*
   2  * Command for accessing SPI flash.
   3  *
   4  * Copyright (C) 2008 Atmel Corporation
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <div64.h>
  11 #include <malloc.h>
  12 #include <spi_flash.h>
  13
  14 #include <asm/io.h>
  15
  16 static struct spi_flash *flash;
  17
  18
  19 /*
  20  * This function computes the length argument for the erase command.
  21  * The length on which the command is to operate can be given in two forms:
  22  * 1. <cmd> offset len  - operate on <'offset',  'len')
  23  * 2. <cmd> offset +len - operate on <'offset',  'round_up(len)')
  24  * If the second form is used and the length doesn't fall on the
  25  * sector boundary, than it will be adjusted to the next sector boundary.
  26  * If it isn't in the flash, the function will fail (return -1).
  27  * Input:
  28  *    arg: length specification (i.e. both command arguments)
  29  * Output:
  30  *    len: computed length for operation
  31  * Return:
  32  *    1: success
  33  *   -1: failure (bad format, bad address).
  34  */
  35 static int sf_parse_len_arg(char *arg, ulong *len)
  36 {
  37         char *ep;
  38         char round_up_len; /* indicates if the "+length" form used */
  39         ulong len_arg;
  40
  41         round_up_len = 0;
  42         if (*arg == '+') {
  43                 round_up_len = 1;
  44                 ++arg;
  45         }
  46
  47         len_arg = simple_strtoul(arg, &ep, 16);
  48         if (ep == arg || *ep != '\0')
  49                 return -1;
  50
  51         if (round_up_len && flash->sector_size > 0)
  52                 *len = ROUND(len_arg, flash->sector_size);
  53         else
  54                 *len = len_arg;
  55
  56         return 1;
  57 }
  58
  59 /**
  60  * This function takes a byte length and a delta unit of time to compute the
  61  * approximate bytes per second
  62  *
  63  * @param len           amount of bytes currently processed
  64  * @param start_ms      start time of processing in ms
  65  * @return bytes per second if OK, 0 on error
  66  */
  67 static ulong bytes_per_second(unsigned int len, ulong start_ms)
  68 {
  69         /* less accurate but avoids overflow */
  70         if (len >= ((unsigned int) -1) / 1024)
  71                 return len / (max(get_timer(start_ms) / 1024, 1));
  72         else
  73                 return 1024 * len / max(get_timer(start_ms), 1);
  74 }
  75
  76 static int do_spi_flash_probe(int argc, char * const argv[])
  77 {
  78         unsigned int bus = CONFIG_SF_DEFAULT_BUS;
  79         unsigned int cs = CONFIG_SF_DEFAULT_CS;
  80         unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
  81         unsigned int mode = CONFIG_SF_DEFAULT_MODE;
  82         char *endp;
  83         struct spi_flash *new;
  84
  85         if (argc >= 2) {
  86                 cs = simple_strtoul(argv[1], &endp, 0);
  87                 if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
  88                         return -1;
  89                 if (*endp == ':') {
  90                         if (endp[1] == 0)
  91                                 return -1;
  92
  93                         bus = cs;
  94                         cs = simple_strtoul(endp + 1, &endp, 0);
  95                         if (*endp != 0)
  96                                 return -1;
  97                 }
  98         }
  99
 100         if (argc >= 3) {
 101                 speed = simple_strtoul(argv[2], &endp, 0);
 102                 if (*argv[2] == 0 || *endp != 0)
 103                         return -1;
 104         }
 105         if (argc >= 4) {
 106                 mode = simple_strtoul(argv[3], &endp, 16);
 107                 if (*argv[3] == 0 || *endp != 0)
 108                         return -1;
 109         }
 110
 111         new = spi_flash_probe(bus, cs, speed, mode);
 112         if (!new) {
 113                 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
 114                 return 1;
 115         }
 116
 117         if (flash)
 118                 spi_flash_free(flash);
 119         flash = new;
 120
 121         return 0;
 122 }
 123
 124 /**
 125  * Write a block of data to SPI flash, first checking if it is different from
 126  * what is already there.
 127  *
 128  * If the data being written is the same, then *skipped is incremented by len.
 129  *
 130  * @param flash         flash context pointer
 131  * @param offset        flash offset to write
 132  * @param len           number of bytes to write
 133  * @param buf           buffer to write from
 134  * @param cmp_buf       read buffer to use to compare data
 135  * @param skipped       Count of skipped data (incremented by this function)
 136  * @return NULL if OK, else a string containing the stage which failed
 137  */
 138 static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
 139                 size_t len, const char *buf, char *cmp_buf, size_t *skipped)
 140 {
 141         debug("offset=%#x, sector_size=%#x, len=%#zx\n",
 142               offset, flash->sector_size, len);
 143         /* Read the entire sector so to allow for rewriting */
 144         if (spi_flash_read(flash, offset, flash->sector_size, cmp_buf))
 145                 return "read";
 146         /* Compare only what is meaningful (len) */
 147         if (memcmp(cmp_buf, buf, len) == 0) {
 148                 debug("Skip region %x size %zx: no change\n",
 149                       offset, len);
 150                 *skipped += len;
 151                 return NULL;
 152         }
 153         /* Erase the entire sector */
 154         if (spi_flash_erase(flash, offset, flash->sector_size))
 155                 return "erase";
 156         /* Write the initial part of the block from the source */
 157         if (spi_flash_write(flash, offset, len, buf))
 158                 return "write";
 159         /* If it's a partial sector, rewrite the existing part */
 160         if (len != flash->sector_size) {
 161                 /* Rewrite the original data to the end of the sector */
 162                 if (spi_flash_write(flash, offset + len,
 163                                     flash->sector_size - len, &cmp_buf[len]))
 164                         return "write";
 165         }
 166
 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 = 1;
 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 (strncmp(argv[0], "read", 4) == 0 ||
 268                         strncmp(argv[0], "write", 5) == 0) {
 269                 int read;
 270
 271                 read = strncmp(argv[0], "read", 4) == 0;
 272                 if (read)
 273                         ret = spi_flash_read(flash, offset, len, buf);
 274                 else
 275                         ret = spi_flash_write(flash, offset, len, buf);
 276
 277                 printf("SF: %zu bytes @ %#x %s: %s\n", (size_t)len, (u32)offset,
 278                        read ? "Read" : "Written", ret ? "ERROR" : "OK");
 279         }
 280
 281         unmap_physmem(buf, len);
 282
 283         return ret == 0 ? 0 : 1;
 284 }
 285
 286 static int do_spi_flash_erase(int argc, char * const argv[])
 287 {
 288         unsigned long offset;
 289         unsigned long len;
 290         char *endp;
 291         int ret;
 292
 293         if (argc < 3)
 294                 return -1;
 295
 296         offset = simple_strtoul(argv[1], &endp, 16);
 297         if (*argv[1] == 0 || *endp != 0)
 298                 return -1;
 299
 300         ret = sf_parse_len_arg(argv[2], &len);
 301         if (ret != 1)
 302                 return -1;
 303
 304         /* Consistency checking */
 305         if (offset + len > flash->size) {
 306                 printf("ERROR: attempting %s past flash size (%#x)\n",
 307                        argv[0], flash->size);
 308                 return 1;
 309         }
 310
 311         ret = spi_flash_erase(flash, offset, len);
 312         printf("SF: %zu bytes @ %#x Erased: %s\n", (size_t)len, (u32)offset,
 313                ret ? "ERROR" : "OK");
 314
 315         return ret == 0 ? 0 : 1;
 316 }
 317
 318 #ifdef CONFIG_CMD_SF_TEST
 319 enum {
 320         STAGE_ERASE,
 321         STAGE_CHECK,
 322         STAGE_WRITE,
 323         STAGE_READ,
 324
 325         STAGE_COUNT,
 326 };
 327
 328 static char *stage_name[STAGE_COUNT] = {
 329         "erase",
 330         "check",
 331         "write",
 332         "read",
 333 };
 334
 335 struct test_info {
 336         int stage;
 337         int bytes;
 338         unsigned base_ms;
 339         unsigned time_ms[STAGE_COUNT];
 340 };
 341
 342 static void show_time(struct test_info *test, int stage)
 343 {
 344         uint64_t speed; /* KiB/s */
 345         int bps;        /* Bits per second */
 346
 347         speed = (long long)test->bytes * 1000;
 348         if (test->time_ms[stage])
 349                 do_div(speed, test->time_ms[stage] * 1024);
 350         bps = speed * 8;
 351
 352         printf("%d %s: %d ticks, %d KiB/s %d.%03d Mbps\n", stage,
 353                stage_name[stage], test->time_ms[stage],
 354                (int)speed, bps / 1000, bps % 1000);
 355 }
 356
 357 static void spi_test_next_stage(struct test_info *test)
 358 {
 359         test->time_ms[test->stage] = get_timer(test->base_ms);
 360         show_time(test, test->stage);
 361         test->base_ms = get_timer(0);
 362         test->stage++;
 363 }
 364
 365 /**
 366  * Run a test on the SPI flash
 367  *
 368  * @param flash         SPI flash to use
 369  * @param buf           Source buffer for data to write
 370  * @param len           Size of data to read/write
 371  * @param offset        Offset within flash to check
 372  * @param vbuf          Verification buffer
 373  * @return 0 if ok, -1 on error
 374  */
 375 static int spi_flash_test(struct spi_flash *flash, uint8_t *buf, ulong len,
 376                            ulong offset, uint8_t *vbuf)
 377 {
 378         struct test_info test;
 379         int i;
 380
 381         printf("SPI flash test:\n");
 382         memset(&test, '\0', sizeof(test));
 383         test.base_ms = get_timer(0);
 384         test.bytes = len;
 385         if (spi_flash_erase(flash, offset, len)) {
 386                 printf("Erase failed\n");
 387                 return -1;
 388         }
 389         spi_test_next_stage(&test);
 390
 391         if (spi_flash_read(flash, offset, len, vbuf)) {
 392                 printf("Check read failed\n");
 393                 return -1;
 394         }
 395         for (i = 0; i < len; i++) {
 396                 if (vbuf[i] != 0xff) {
 397                         printf("Check failed at %d\n", i);
 398                         print_buffer(i, vbuf + i, 1, min(len - i, 0x40), 0);
 399                         return -1;
 400                 }
 401         }
 402         spi_test_next_stage(&test);
 403
 404         if (spi_flash_write(flash, offset, len, buf)) {
 405                 printf("Write failed\n");
 406                 return -1;
 407         }
 408         memset(vbuf, '\0', len);
 409         spi_test_next_stage(&test);
 410
 411         if (spi_flash_read(flash, offset, len, vbuf)) {
 412                 printf("Read failed\n");
 413                 return -1;
 414         }
 415         spi_test_next_stage(&test);
 416
 417         for (i = 0; i < len; i++) {
 418                 if (buf[i] != vbuf[i]) {
 419                         printf("Verify failed at %d, good data:\n", i);
 420                         print_buffer(i, buf + i, 1, min(len - i, 0x40), 0);
 421                         printf("Bad data:\n");
 422                         print_buffer(i, vbuf + i, 1, min(len - i, 0x40), 0);
 423                         return -1;
 424                 }
 425         }
 426         printf("Test passed\n");
 427         for (i = 0; i < STAGE_COUNT; i++)
 428                 show_time(&test, i);
 429
 430         return 0;
 431 }
 432
 433 static int do_spi_flash_test(int argc, char * const argv[])
 434 {
 435         unsigned long offset;
 436         unsigned long len;
 437         uint8_t *buf, *from;
 438         char *endp;
 439         uint8_t *vbuf;
 440         int ret;
 441
 442         if (argc < 3)
 443                 return -1;
 444         offset = simple_strtoul(argv[1], &endp, 16);
 445         if (*argv[1] == 0 || *endp != 0)
 446                 return -1;
 447         len = simple_strtoul(argv[2], &endp, 16);
 448         if (*argv[2] == 0 || *endp != 0)
 449                 return -1;
 450
 451         vbuf = malloc(len);
 452         if (!vbuf) {
 453                 printf("Cannot allocate memory (%lu bytes)\n", len);
 454                 return 1;
 455         }
 456         buf = malloc(len);
 457         if (!buf) {
 458                 free(vbuf);
 459                 printf("Cannot allocate memory (%lu bytes)\n", len);
 460                 return 1;
 461         }
 462
 463         from = map_sysmem(CONFIG_SYS_TEXT_BASE, 0);
 464         memcpy(buf, from, len);
 465         ret = spi_flash_test(flash, buf, len, offset, vbuf);
 466         free(vbuf);
 467         free(buf);
 468         if (ret) {
 469                 printf("Test failed\n");
 470                 return 1;
 471         }
 472
 473         return 0;
 474 }
 475 #endif /* CONFIG_CMD_SF_TEST */
 476
 477 static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc,
 478                         char * const argv[])
 479 {
 480         const char *cmd;
 481         int ret;
 482
 483         /* need at least two arguments */
 484         if (argc < 2)
 485                 goto usage;
 486
 487         cmd = argv[1];
 488         --argc;
 489         ++argv;
 490
 491         if (strcmp(cmd, "probe") == 0) {
 492                 ret = do_spi_flash_probe(argc, argv);
 493                 goto done;
 494         }
 495
 496         /* The remaining commands require a selected device */
 497         if (!flash) {
 498                 puts("No SPI flash selected. Please run `sf probe'\n");
 499                 return 1;
 500         }
 501
 502         if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
 503             strcmp(cmd, "update") == 0)
 504                 ret = do_spi_flash_read_write(argc, argv);
 505         else if (strcmp(cmd, "erase") == 0)
 506                 ret = do_spi_flash_erase(argc, argv);
 507 #ifdef CONFIG_CMD_SF_TEST
 508         else if (!strcmp(cmd, "test"))
 509                 ret = do_spi_flash_test(argc, argv);
 510 #endif
 511         else
 512                 ret = -1;
 513
 514 done:
 515         if (ret != -1)
 516                 return ret;
 517
 518 usage:
 519         return CMD_RET_USAGE;
 520 }
 521
 522 #ifdef CONFIG_CMD_SF_TEST
 523 #define SF_TEST_HELP "\nsf test offset len              " \
 524                 "- run a very basic destructive test"
 525 #else
 526 #define SF_TEST_HELP
 527 #endif
 528
 529 U_BOOT_CMD(
 530         sf,     5,      1,      do_spi_flash,
 531         "SPI flash sub-system",
 532         "probe [[bus:]cs] [hz] [mode]   - init flash device on given SPI bus\n"
 533         "                                 and chip select\n"
 534         "sf read addr offset len        - read `len' bytes starting at\n"
 535         "                                 `offset' to memory at `addr'\n"
 536         "sf write addr offset len       - write `len' bytes from memory\n"
 537         "                                 at `addr' to flash at `offset'\n"
 538         "sf erase offset [+]len         - erase `len' bytes from `offset'\n"
 539         "                                 `+len' round up `len' to block size\n"
 540         "sf update addr offset len      - erase and write `len' bytes from memory\n"
 541         "                                 at `addr' to flash at `offset'"
 542         SF_TEST_HELP
 543 );