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;
22 * This function computes the length argument for the erase command.
23 * The length on which the command is to operate can be given in two forms:
24 * 1. <cmd> offset len - operate on <'offset', 'len')
25 * 2. <cmd> offset +len - operate on <'offset', 'round_up(len)')
26 * If the second form is used and the length doesn't fall on the
27 * sector boundary, than it will be adjusted to the next sector boundary.
28 * If it isn't in the flash, the function will fail (return -1).
30 * arg: length specification (i.e. both command arguments)
32 * len: computed length for operation
35 * -1: failure (bad format, bad address).
37 static int sf_parse_len_arg(char *arg, ulong *len)
40 char round_up_len; /* indicates if the "+length" form used */
49 len_arg = simple_strtoul(arg, &ep, 16);
50 if (ep == arg || *ep != '\0')
53 if (round_up_len && flash->sector_size > 0)
54 *len = ROUND(len_arg, flash->sector_size);
62 * This function takes a byte length and a delta unit of time to compute the
63 * approximate bytes per second
65 * @param len amount of bytes currently processed
66 * @param start_ms start time of processing in ms
67 * @return bytes per second if OK, 0 on error
69 static ulong bytes_per_second(unsigned int len, ulong start_ms)
71 /* less accurate but avoids overflow */
72 if (len >= ((unsigned int) -1) / 1024)
73 return len / (max(get_timer(start_ms) / 1024, 1UL));
75 return 1024 * len / max(get_timer(start_ms), 1UL);
78 static int do_spi_flash_probe(int argc, char * const argv[])
80 unsigned int bus = CONFIG_SF_DEFAULT_BUS;
81 unsigned int cs = CONFIG_SF_DEFAULT_CS;
82 unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
83 unsigned int mode = CONFIG_SF_DEFAULT_MODE;
85 #ifdef CONFIG_DM_SPI_FLASH
86 struct udevice *new, *bus_dev;
89 struct spi_flash *new;
93 cs = simple_strtoul(argv[1], &endp, 0);
94 if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
101 cs = simple_strtoul(endp + 1, &endp, 0);
108 speed = simple_strtoul(argv[2], &endp, 0);
109 if (*argv[2] == 0 || *endp != 0)
113 mode = simple_strtoul(argv[3], &endp, 16);
114 if (*argv[3] == 0 || *endp != 0)
118 #ifdef CONFIG_DM_SPI_FLASH
119 /* Remove the old device, otherwise probe will just be a nop */
120 ret = spi_find_bus_and_cs(bus, cs, &bus_dev, &new);
126 ret = spi_flash_probe_bus_cs(bus, cs, speed, mode, &new);
128 printf("Failed to initialize SPI flash at %u:%u (error %d)\n",
133 flash = new->uclass_priv;
135 new = spi_flash_probe(bus, cs, speed, mode);
137 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
142 spi_flash_free(flash);
150 * Write a block of data to SPI flash, first checking if it is different from
151 * what is already there.
153 * If the data being written is the same, then *skipped is incremented by len.
155 * @param flash flash context pointer
156 * @param offset flash offset to write
157 * @param len number of bytes to write
158 * @param buf buffer to write from
159 * @param cmp_buf read buffer to use to compare data
160 * @param skipped Count of skipped data (incremented by this function)
161 * @return NULL if OK, else a string containing the stage which failed
163 static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
164 size_t len, const char *buf, char *cmp_buf, size_t *skipped)
166 debug("offset=%#x, sector_size=%#x, len=%#zx\n",
167 offset, flash->sector_size, len);
168 /* Read the entire sector so to allow for rewriting */
169 if (spi_flash_read(flash, offset, flash->sector_size, cmp_buf))
171 /* Compare only what is meaningful (len) */
172 if (memcmp(cmp_buf, buf, len) == 0) {
173 debug("Skip region %x size %zx: no change\n",
178 /* Erase the entire sector */
179 if (spi_flash_erase(flash, offset, flash->sector_size))
181 /* Write the initial part of the block from the source */
182 if (spi_flash_write(flash, offset, len, buf))
184 /* If it's a partial sector, rewrite the existing part */
185 if (len != flash->sector_size) {
186 /* Rewrite the original data to the end of the sector */
187 if (spi_flash_write(flash, offset + len,
188 flash->sector_size - len, &cmp_buf[len]))
196 * Update an area of SPI flash by erasing and writing any blocks which need
197 * to change. Existing blocks with the correct data are left unchanged.
199 * @param flash flash context pointer
200 * @param offset flash offset to write
201 * @param len number of bytes to write
202 * @param buf buffer to write from
203 * @return 0 if ok, 1 on error
205 static int spi_flash_update(struct spi_flash *flash, u32 offset,
206 size_t len, const char *buf)
208 const char *err_oper = NULL;
210 const char *end = buf + len;
211 size_t todo; /* number of bytes to do in this pass */
212 size_t skipped = 0; /* statistics */
213 const ulong start_time = get_timer(0);
215 const char *start_buf = buf;
218 if (end - buf >= 200)
219 scale = (end - buf) / 100;
220 cmp_buf = malloc(flash->sector_size);
222 ulong last_update = get_timer(0);
224 for (; buf < end && !err_oper; buf += todo, offset += todo) {
225 todo = min_t(size_t, end - buf, flash->sector_size);
226 if (get_timer(last_update) > 100) {
227 printf(" \rUpdating, %zu%% %lu B/s",
228 100 - (end - buf) / scale,
229 bytes_per_second(buf - start_buf,
231 last_update = get_timer(0);
233 err_oper = spi_flash_update_block(flash, offset, todo,
234 buf, cmp_buf, &skipped);
242 printf("SPI flash failed in %s step\n", err_oper);
246 delta = get_timer(start_time);
247 printf("%zu bytes written, %zu bytes skipped", len - skipped,
249 printf(" in %ld.%lds, speed %ld B/s\n",
250 delta / 1000, delta % 1000, bytes_per_second(len, start_time));
255 static int do_spi_flash_read_write(int argc, char * const argv[])
258 unsigned long offset;
267 addr = simple_strtoul(argv[1], &endp, 16);
268 if (*argv[1] == 0 || *endp != 0)
270 offset = simple_strtoul(argv[2], &endp, 16);
271 if (*argv[2] == 0 || *endp != 0)
273 len = simple_strtoul(argv[3], &endp, 16);
274 if (*argv[3] == 0 || *endp != 0)
277 /* Consistency checking */
278 if (offset + len > flash->size) {
279 printf("ERROR: attempting %s past flash size (%#x)\n",
280 argv[0], flash->size);
284 buf = map_physmem(addr, len, MAP_WRBACK);
286 puts("Failed to map physical memory\n");
290 if (strcmp(argv[0], "update") == 0) {
291 ret = spi_flash_update(flash, offset, len, buf);
292 } else if (strncmp(argv[0], "read", 4) == 0 ||
293 strncmp(argv[0], "write", 5) == 0) {
296 read = strncmp(argv[0], "read", 4) == 0;
298 ret = spi_flash_read(flash, offset, len, buf);
300 ret = spi_flash_write(flash, offset, len, buf);
302 printf("SF: %zu bytes @ %#x %s: %s\n", (size_t)len, (u32)offset,
303 read ? "Read" : "Written", ret ? "ERROR" : "OK");
306 unmap_physmem(buf, len);
308 return ret == 0 ? 0 : 1;
311 static int do_spi_flash_erase(int argc, char * const argv[])
313 unsigned long offset;
321 offset = simple_strtoul(argv[1], &endp, 16);
322 if (*argv[1] == 0 || *endp != 0)
325 ret = sf_parse_len_arg(argv[2], &len);
329 /* Consistency checking */
330 if (offset + len > flash->size) {
331 printf("ERROR: attempting %s past flash size (%#x)\n",
332 argv[0], flash->size);
336 ret = spi_flash_erase(flash, offset, len);
337 printf("SF: %zu bytes @ %#x Erased: %s\n", (size_t)len, (u32)offset,
338 ret ? "ERROR" : "OK");
340 return ret == 0 ? 0 : 1;
343 #ifdef CONFIG_CMD_SF_TEST
353 static char *stage_name[STAGE_COUNT] = {
364 unsigned time_ms[STAGE_COUNT];
367 static void show_time(struct test_info *test, int stage)
369 uint64_t speed; /* KiB/s */
370 int bps; /* Bits per second */
372 speed = (long long)test->bytes * 1000;
373 if (test->time_ms[stage])
374 do_div(speed, test->time_ms[stage] * 1024);
377 printf("%d %s: %d ticks, %d KiB/s %d.%03d Mbps\n", stage,
378 stage_name[stage], test->time_ms[stage],
379 (int)speed, bps / 1000, bps % 1000);
382 static void spi_test_next_stage(struct test_info *test)
384 test->time_ms[test->stage] = get_timer(test->base_ms);
385 show_time(test, test->stage);
386 test->base_ms = get_timer(0);
391 * Run a test on the SPI flash
393 * @param flash SPI flash to use
394 * @param buf Source buffer for data to write
395 * @param len Size of data to read/write
396 * @param offset Offset within flash to check
397 * @param vbuf Verification buffer
398 * @return 0 if ok, -1 on error
400 static int spi_flash_test(struct spi_flash *flash, uint8_t *buf, ulong len,
401 ulong offset, uint8_t *vbuf)
403 struct test_info test;
406 printf("SPI flash test:\n");
407 memset(&test, '\0', sizeof(test));
408 test.base_ms = get_timer(0);
410 if (spi_flash_erase(flash, offset, len)) {
411 printf("Erase failed\n");
414 spi_test_next_stage(&test);
416 if (spi_flash_read(flash, offset, len, vbuf)) {
417 printf("Check read failed\n");
420 for (i = 0; i < len; i++) {
421 if (vbuf[i] != 0xff) {
422 printf("Check failed at %d\n", i);
423 print_buffer(i, vbuf + i, 1,
424 min_t(uint, 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,
447 min_t(uint, len - i, 0x40), 0);
448 printf("Bad data:\n");
449 print_buffer(i, vbuf + i, 1,
450 min_t(uint, len - i, 0x40), 0);
454 printf("Test passed\n");
455 for (i = 0; i < STAGE_COUNT; i++)
461 static int do_spi_flash_test(int argc, char * const argv[])
463 unsigned long offset;
472 offset = simple_strtoul(argv[1], &endp, 16);
473 if (*argv[1] == 0 || *endp != 0)
475 len = simple_strtoul(argv[2], &endp, 16);
476 if (*argv[2] == 0 || *endp != 0)
481 printf("Cannot allocate memory (%lu bytes)\n", len);
487 printf("Cannot allocate memory (%lu bytes)\n", len);
491 from = map_sysmem(CONFIG_SYS_TEXT_BASE, 0);
492 memcpy(buf, from, len);
493 ret = spi_flash_test(flash, buf, len, offset, vbuf);
497 printf("Test failed\n");
503 #endif /* CONFIG_CMD_SF_TEST */
505 static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc,
511 /* need at least two arguments */
519 if (strcmp(cmd, "probe") == 0) {
520 ret = do_spi_flash_probe(argc, argv);
524 /* The remaining commands require a selected device */
526 puts("No SPI flash selected. Please run `sf probe'\n");
530 if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
531 strcmp(cmd, "update") == 0)
532 ret = do_spi_flash_read_write(argc, argv);
533 else if (strcmp(cmd, "erase") == 0)
534 ret = do_spi_flash_erase(argc, argv);
535 #ifdef CONFIG_CMD_SF_TEST
536 else if (!strcmp(cmd, "test"))
537 ret = do_spi_flash_test(argc, argv);
547 return CMD_RET_USAGE;
550 #ifdef CONFIG_CMD_SF_TEST
551 #define SF_TEST_HELP "\nsf test offset len " \
552 "- run a very basic destructive test"
558 sf, 5, 1, do_spi_flash,
559 "SPI flash sub-system",
560 "probe [[bus:]cs] [hz] [mode] - init flash device on given SPI bus\n"
562 "sf read addr offset len - read `len' bytes starting at\n"
563 " `offset' to memory at `addr'\n"
564 "sf write addr offset len - write `len' bytes from memory\n"
565 " at `addr' to flash at `offset'\n"
566 "sf erase offset [+]len - erase `len' bytes from `offset'\n"
567 " `+len' round up `len' to block size\n"
568 "sf update addr offset len - erase and write `len' bytes from memory\n"
569 " at `addr' to flash at `offset'"