2 * Command for accessing SPI flash.
4 * Copyright (C) 2008 Atmel Corporation
6 * SPDX-License-Identifier: GPL-2.0+
12 #include <spi_flash.h>
16 static struct spi_flash *flash;
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).
28 * arg: length specification (i.e. both command arguments)
30 * len: computed length for operation
33 * -1: failure (bad format, bad address).
35 static int sf_parse_len_arg(char *arg, ulong *len)
38 char round_up_len; /* indicates if the "+length" form used */
47 len_arg = simple_strtoul(arg, &ep, 16);
48 if (ep == arg || *ep != '\0')
51 if (round_up_len && flash->sector_size > 0)
52 *len = ROUND(len_arg, flash->sector_size);
60 * This function takes a byte length and a delta unit of time to compute the
61 * approximate bytes per second
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
67 static ulong bytes_per_second(unsigned int len, ulong start_ms)
69 /* less accurate but avoids overflow */
70 if (len >= ((unsigned int) -1) / 1024)
71 return len / (max(get_timer(start_ms) / 1024, 1));
73 return 1024 * len / max(get_timer(start_ms), 1);
76 static int do_spi_flash_probe(int argc, char * const argv[])
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;
83 struct spi_flash *new;
86 cs = simple_strtoul(argv[1], &endp, 0);
87 if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
94 cs = simple_strtoul(endp + 1, &endp, 0);
101 speed = simple_strtoul(argv[2], &endp, 0);
102 if (*argv[2] == 0 || *endp != 0)
106 mode = simple_strtoul(argv[3], &endp, 16);
107 if (*argv[3] == 0 || *endp != 0)
111 new = spi_flash_probe(bus, cs, speed, mode);
113 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
118 spi_flash_free(flash);
125 * Write a block of data to SPI flash, first checking if it is different from
126 * what is already there.
128 * If the data being written is the same, then *skipped is incremented by len.
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
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)
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))
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",
153 /* Erase the entire sector */
154 if (spi_flash_erase(flash, offset, flash->sector_size))
156 /* Write the initial part of the block from the source */
157 if (spi_flash_write(flash, offset, len, buf))
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]))
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.
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
180 static int spi_flash_update(struct spi_flash *flash, u32 offset,
181 size_t len, const char *buf)
183 const char *err_oper = NULL;
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);
190 const char *start_buf = buf;
193 if (end - buf >= 200)
194 scale = (end - buf) / 100;
195 cmp_buf = malloc(flash->sector_size);
197 ulong last_update = get_timer(0);
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,
206 last_update = get_timer(0);
208 err_oper = spi_flash_update_block(flash, offset, todo,
209 buf, cmp_buf, &skipped);
217 printf("SPI flash failed in %s step\n", err_oper);
221 delta = get_timer(start_time);
222 printf("%zu bytes written, %zu bytes skipped", len - skipped,
224 printf(" in %ld.%lds, speed %ld B/s\n",
225 delta / 1000, delta % 1000, bytes_per_second(len, start_time));
230 static int do_spi_flash_read_write(int argc, char * const argv[])
233 unsigned long offset;
242 addr = simple_strtoul(argv[1], &endp, 16);
243 if (*argv[1] == 0 || *endp != 0)
245 offset = simple_strtoul(argv[2], &endp, 16);
246 if (*argv[2] == 0 || *endp != 0)
248 len = simple_strtoul(argv[3], &endp, 16);
249 if (*argv[3] == 0 || *endp != 0)
252 /* Consistency checking */
253 if (offset + len > flash->size) {
254 printf("ERROR: attempting %s past flash size (%#x)\n",
255 argv[0], flash->size);
259 buf = map_physmem(addr, len, MAP_WRBACK);
261 puts("Failed to map physical memory\n");
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) {
271 read = strncmp(argv[0], "read", 4) == 0;
273 ret = spi_flash_read(flash, offset, len, buf);
275 ret = spi_flash_write(flash, offset, len, buf);
277 printf("SF: %zu bytes @ %#x %s: %s\n", (size_t)len, (u32)offset,
278 read ? "Read" : "Written", ret ? "ERROR" : "OK");
281 unmap_physmem(buf, len);
283 return ret == 0 ? 0 : 1;
286 static int do_spi_flash_erase(int argc, char * const argv[])
288 unsigned long offset;
296 offset = simple_strtoul(argv[1], &endp, 16);
297 if (*argv[1] == 0 || *endp != 0)
300 ret = sf_parse_len_arg(argv[2], &len);
304 /* Consistency checking */
305 if (offset + len > flash->size) {
306 printf("ERROR: attempting %s past flash size (%#x)\n",
307 argv[0], flash->size);
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");
315 return ret == 0 ? 0 : 1;
318 #ifdef CONFIG_CMD_SF_TEST
328 static char *stage_name[STAGE_COUNT] = {
339 unsigned time_ms[STAGE_COUNT];
342 static void show_time(struct test_info *test, int stage)
344 uint64_t speed; /* KiB/s */
345 int bps; /* Bits per second */
347 speed = (long long)test->bytes * 1000;
348 if (test->time_ms[stage])
349 do_div(speed, test->time_ms[stage] * 1024);
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);
357 static void spi_test_next_stage(struct test_info *test)
359 test->time_ms[test->stage] = get_timer(test->base_ms);
360 show_time(test, test->stage);
361 test->base_ms = get_timer(0);
366 * Run a test on the SPI flash
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
375 static int spi_flash_test(struct spi_flash *flash, uint8_t *buf, ulong len,
376 ulong offset, uint8_t *vbuf)
378 struct test_info test;
381 printf("SPI flash test:\n");
382 memset(&test, '\0', sizeof(test));
383 test.base_ms = get_timer(0);
385 if (spi_flash_erase(flash, offset, len)) {
386 printf("Erase failed\n");
389 spi_test_next_stage(&test);
391 if (spi_flash_read(flash, offset, len, vbuf)) {
392 printf("Check read failed\n");
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);
402 spi_test_next_stage(&test);
404 if (spi_flash_write(flash, offset, len, buf)) {
405 printf("Write failed\n");
408 memset(vbuf, '\0', len);
409 spi_test_next_stage(&test);
411 if (spi_flash_read(flash, offset, len, vbuf)) {
412 printf("Read failed\n");
415 spi_test_next_stage(&test);
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);
426 printf("Test passed\n");
427 for (i = 0; i < STAGE_COUNT; i++)
433 static int do_spi_flash_test(int argc, char * const argv[])
435 unsigned long offset;
444 offset = simple_strtoul(argv[1], &endp, 16);
445 if (*argv[1] == 0 || *endp != 0)
447 len = simple_strtoul(argv[2], &endp, 16);
448 if (*argv[2] == 0 || *endp != 0)
453 printf("Cannot allocate memory (%lu bytes)\n", len);
459 printf("Cannot allocate memory (%lu bytes)\n", len);
463 from = map_sysmem(CONFIG_SYS_TEXT_BASE, 0);
464 memcpy(buf, from, len);
465 ret = spi_flash_test(flash, buf, len, offset, vbuf);
469 printf("Test failed\n");
475 #endif /* CONFIG_CMD_SF_TEST */
477 static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc,
483 /* need at least two arguments */
491 if (strcmp(cmd, "probe") == 0) {
492 ret = do_spi_flash_probe(argc, argv);
496 /* The remaining commands require a selected device */
498 puts("No SPI flash selected. Please run `sf probe'\n");
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);
519 return CMD_RET_USAGE;
522 #ifdef CONFIG_CMD_SF_TEST
523 #define SF_TEST_HELP "\nsf test offset len " \
524 "- run a very basic destructive test"
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"
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'"