2 * Command for accessing SPI flash.
4 * Copyright (C) 2008 Atmel Corporation
6 * SPDX-License-Identifier: GPL-2.0+
14 #include <spi_flash.h>
17 #include <dm/device-internal.h>
19 static struct spi_flash *flash;
23 * This function computes the length argument for the erase command.
24 * The length on which the command is to operate can be given in two forms:
25 * 1. <cmd> offset len - operate on <'offset', 'len')
26 * 2. <cmd> offset +len - operate on <'offset', 'round_up(len)')
27 * If the second form is used and the length doesn't fall on the
28 * sector boundary, than it will be adjusted to the next sector boundary.
29 * If it isn't in the flash, the function will fail (return -1).
31 * arg: length specification (i.e. both command arguments)
33 * len: computed length for operation
36 * -1: failure (bad format, bad address).
38 static int sf_parse_len_arg(char *arg, ulong *len)
41 char round_up_len; /* indicates if the "+length" form used */
50 len_arg = simple_strtoul(arg, &ep, 16);
51 if (ep == arg || *ep != '\0')
54 if (round_up_len && flash->sector_size > 0)
55 *len = ROUND(len_arg, flash->sector_size);
63 * This function takes a byte length and a delta unit of time to compute the
64 * approximate bytes per second
66 * @param len amount of bytes currently processed
67 * @param start_ms start time of processing in ms
68 * @return bytes per second if OK, 0 on error
70 static ulong bytes_per_second(unsigned int len, ulong start_ms)
72 /* less accurate but avoids overflow */
73 if (len >= ((unsigned int) -1) / 1024)
74 return len / (max(get_timer(start_ms) / 1024, 1));
76 return 1024 * len / max(get_timer(start_ms), 1);
79 static int do_spi_flash_probe(int argc, char * const argv[])
81 unsigned int bus = CONFIG_SF_DEFAULT_BUS;
82 unsigned int cs = CONFIG_SF_DEFAULT_CS;
83 unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
84 unsigned int mode = CONFIG_SF_DEFAULT_MODE;
86 #ifdef CONFIG_DM_SPI_FLASH
87 struct udevice *new, *bus_dev;
90 struct spi_flash *new;
94 cs = simple_strtoul(argv[1], &endp, 0);
95 if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
102 cs = simple_strtoul(endp + 1, &endp, 0);
109 speed = simple_strtoul(argv[2], &endp, 0);
110 if (*argv[2] == 0 || *endp != 0)
114 mode = simple_strtoul(argv[3], &endp, 16);
115 if (*argv[3] == 0 || *endp != 0)
119 #ifdef CONFIG_DM_SPI_FLASH
120 /* Remove the old device, otherwise probe will just be a nop */
121 ret = spi_find_bus_and_cs(bus, cs, &bus_dev, &new);
127 ret = spi_flash_probe_bus_cs(bus, cs, speed, mode, &new);
129 printf("Failed to initialize SPI flash at %u:%u (error %d)\n",
134 flash = new->uclass_priv;
136 new = spi_flash_probe(bus, cs, speed, mode);
138 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
143 spi_flash_free(flash);
151 * Write a block of data to SPI flash, first checking if it is different from
152 * what is already there.
154 * If the data being written is the same, then *skipped is incremented by len.
156 * @param flash flash context pointer
157 * @param offset flash offset to write
158 * @param len number of bytes to write
159 * @param buf buffer to write from
160 * @param cmp_buf read buffer to use to compare data
161 * @param skipped Count of skipped data (incremented by this function)
162 * @return NULL if OK, else a string containing the stage which failed
164 static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
165 size_t len, const char *buf, char *cmp_buf, size_t *skipped)
167 debug("offset=%#x, sector_size=%#x, len=%#zx\n",
168 offset, flash->sector_size, len);
169 /* Read the entire sector so to allow for rewriting */
170 if (spi_flash_read(flash, offset, flash->sector_size, cmp_buf))
172 /* Compare only what is meaningful (len) */
173 if (memcmp(cmp_buf, buf, len) == 0) {
174 debug("Skip region %x size %zx: no change\n",
179 /* Erase the entire sector */
180 if (spi_flash_erase(flash, offset, flash->sector_size))
182 /* Write the initial part of the block from the source */
183 if (spi_flash_write(flash, offset, len, buf))
185 /* If it's a partial sector, rewrite the existing part */
186 if (len != flash->sector_size) {
187 /* Rewrite the original data to the end of the sector */
188 if (spi_flash_write(flash, offset + len,
189 flash->sector_size - len, &cmp_buf[len]))
197 * Update an area of SPI flash by erasing and writing any blocks which need
198 * to change. Existing blocks with the correct data are left unchanged.
200 * @param flash flash context pointer
201 * @param offset flash offset to write
202 * @param len number of bytes to write
203 * @param buf buffer to write from
204 * @return 0 if ok, 1 on error
206 static int spi_flash_update(struct spi_flash *flash, u32 offset,
207 size_t len, const char *buf)
209 const char *err_oper = NULL;
211 const char *end = buf + len;
212 size_t todo; /* number of bytes to do in this pass */
213 size_t skipped = 0; /* statistics */
214 const ulong start_time = get_timer(0);
216 const char *start_buf = buf;
219 if (end - buf >= 200)
220 scale = (end - buf) / 100;
221 cmp_buf = malloc(flash->sector_size);
223 ulong last_update = get_timer(0);
225 for (; buf < end && !err_oper; buf += todo, offset += todo) {
226 todo = min(end - buf, flash->sector_size);
227 if (get_timer(last_update) > 100) {
228 printf(" \rUpdating, %zu%% %lu B/s",
229 100 - (end - buf) / scale,
230 bytes_per_second(buf - start_buf,
232 last_update = get_timer(0);
234 err_oper = spi_flash_update_block(flash, offset, todo,
235 buf, cmp_buf, &skipped);
243 printf("SPI flash failed in %s step\n", err_oper);
247 delta = get_timer(start_time);
248 printf("%zu bytes written, %zu bytes skipped", len - skipped,
250 printf(" in %ld.%lds, speed %ld B/s\n",
251 delta / 1000, delta % 1000, bytes_per_second(len, start_time));
256 static int do_spi_flash_read_write(int argc, char * const argv[])
259 unsigned long offset;
268 addr = simple_strtoul(argv[1], &endp, 16);
269 if (*argv[1] == 0 || *endp != 0)
271 offset = simple_strtoul(argv[2], &endp, 16);
272 if (*argv[2] == 0 || *endp != 0)
274 len = simple_strtoul(argv[3], &endp, 16);
275 if (*argv[3] == 0 || *endp != 0)
278 /* Consistency checking */
279 if (offset + len > flash->size) {
280 printf("ERROR: attempting %s past flash size (%#x)\n",
281 argv[0], flash->size);
285 buf = map_physmem(addr, len, MAP_WRBACK);
287 puts("Failed to map physical memory\n");
291 if (strcmp(argv[0], "update") == 0) {
292 ret = spi_flash_update(flash, offset, len, buf);
293 } else if (strncmp(argv[0], "read", 4) == 0 ||
294 strncmp(argv[0], "write", 5) == 0) {
297 read = strncmp(argv[0], "read", 4) == 0;
299 ret = spi_flash_read(flash, offset, len, buf);
301 ret = spi_flash_write(flash, offset, len, buf);
303 printf("SF: %zu bytes @ %#x %s: %s\n", (size_t)len, (u32)offset,
304 read ? "Read" : "Written", ret ? "ERROR" : "OK");
307 unmap_physmem(buf, len);
309 return ret == 0 ? 0 : 1;
312 static int do_spi_flash_erase(int argc, char * const argv[])
314 unsigned long offset;
322 offset = simple_strtoul(argv[1], &endp, 16);
323 if (*argv[1] == 0 || *endp != 0)
326 ret = sf_parse_len_arg(argv[2], &len);
330 /* Consistency checking */
331 if (offset + len > flash->size) {
332 printf("ERROR: attempting %s past flash size (%#x)\n",
333 argv[0], flash->size);
337 ret = spi_flash_erase(flash, offset, len);
338 printf("SF: %zu bytes @ %#x Erased: %s\n", (size_t)len, (u32)offset,
339 ret ? "ERROR" : "OK");
341 return ret == 0 ? 0 : 1;
344 #ifdef CONFIG_CMD_SF_TEST
354 static char *stage_name[STAGE_COUNT] = {
365 unsigned time_ms[STAGE_COUNT];
368 static void show_time(struct test_info *test, int stage)
370 uint64_t speed; /* KiB/s */
371 int bps; /* Bits per second */
373 speed = (long long)test->bytes * 1000;
374 if (test->time_ms[stage])
375 do_div(speed, test->time_ms[stage] * 1024);
378 printf("%d %s: %d ticks, %d KiB/s %d.%03d Mbps\n", stage,
379 stage_name[stage], test->time_ms[stage],
380 (int)speed, bps / 1000, bps % 1000);
383 static void spi_test_next_stage(struct test_info *test)
385 test->time_ms[test->stage] = get_timer(test->base_ms);
386 show_time(test, test->stage);
387 test->base_ms = get_timer(0);
392 * Run a test on the SPI flash
394 * @param flash SPI flash to use
395 * @param buf Source buffer for data to write
396 * @param len Size of data to read/write
397 * @param offset Offset within flash to check
398 * @param vbuf Verification buffer
399 * @return 0 if ok, -1 on error
401 static int spi_flash_test(struct spi_flash *flash, uint8_t *buf, ulong len,
402 ulong offset, uint8_t *vbuf)
404 struct test_info test;
407 printf("SPI flash test:\n");
408 memset(&test, '\0', sizeof(test));
409 test.base_ms = get_timer(0);
411 if (spi_flash_erase(flash, offset, len)) {
412 printf("Erase failed\n");
415 spi_test_next_stage(&test);
417 if (spi_flash_read(flash, offset, len, vbuf)) {
418 printf("Check read failed\n");
421 for (i = 0; i < len; i++) {
422 if (vbuf[i] != 0xff) {
423 printf("Check failed at %d\n", i);
424 print_buffer(i, vbuf + i, 1, min(len - i, 0x40), 0);
428 spi_test_next_stage(&test);
430 if (spi_flash_write(flash, offset, len, buf)) {
431 printf("Write failed\n");
434 memset(vbuf, '\0', len);
435 spi_test_next_stage(&test);
437 if (spi_flash_read(flash, offset, len, vbuf)) {
438 printf("Read failed\n");
441 spi_test_next_stage(&test);
443 for (i = 0; i < len; i++) {
444 if (buf[i] != vbuf[i]) {
445 printf("Verify failed at %d, good data:\n", i);
446 print_buffer(i, buf + i, 1, min(len - i, 0x40), 0);
447 printf("Bad data:\n");
448 print_buffer(i, vbuf + i, 1, min(len - i, 0x40), 0);
452 printf("Test passed\n");
453 for (i = 0; i < STAGE_COUNT; i++)
459 static int do_spi_flash_test(int argc, char * const argv[])
461 unsigned long offset;
470 offset = simple_strtoul(argv[1], &endp, 16);
471 if (*argv[1] == 0 || *endp != 0)
473 len = simple_strtoul(argv[2], &endp, 16);
474 if (*argv[2] == 0 || *endp != 0)
479 printf("Cannot allocate memory (%lu bytes)\n", len);
485 printf("Cannot allocate memory (%lu bytes)\n", len);
489 from = map_sysmem(CONFIG_SYS_TEXT_BASE, 0);
490 memcpy(buf, from, len);
491 ret = spi_flash_test(flash, buf, len, offset, vbuf);
495 printf("Test failed\n");
501 #endif /* CONFIG_CMD_SF_TEST */
503 static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc,
509 /* need at least two arguments */
517 if (strcmp(cmd, "probe") == 0) {
518 ret = do_spi_flash_probe(argc, argv);
522 /* The remaining commands require a selected device */
524 puts("No SPI flash selected. Please run `sf probe'\n");
528 if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
529 strcmp(cmd, "update") == 0)
530 ret = do_spi_flash_read_write(argc, argv);
531 else if (strcmp(cmd, "erase") == 0)
532 ret = do_spi_flash_erase(argc, argv);
533 #ifdef CONFIG_CMD_SF_TEST
534 else if (!strcmp(cmd, "test"))
535 ret = do_spi_flash_test(argc, argv);
545 return CMD_RET_USAGE;
548 #ifdef CONFIG_CMD_SF_TEST
549 #define SF_TEST_HELP "\nsf test offset len " \
550 "- run a very basic destructive test"
556 sf, 5, 1, do_spi_flash,
557 "SPI flash sub-system",
558 "probe [[bus:]cs] [hz] [mode] - init flash device on given SPI bus\n"
560 "sf read addr offset len - read `len' bytes starting at\n"
561 " `offset' to memory at `addr'\n"
562 "sf write addr offset len - write `len' bytes from memory\n"
563 " at `addr' to flash at `offset'\n"
564 "sf erase offset [+]len - erase `len' bytes from `offset'\n"
565 " `+len' round up `len' to block size\n"
566 "sf update addr offset len - erase and write `len' bytes from memory\n"
567 " at `addr' to flash at `offset'"