1 // SPDX-License-Identifier: GPL-2.0+
3 * Command for accessing SPI flash.
5 * Copyright (C) 2008 Atmel Corporation
14 #include <spi_flash.h>
15 #include <jffs2/jffs2.h>
16 #include <linux/mtd/mtd.h>
19 #include <dm/device-internal.h>
21 #include "legacy-mtd-utils.h"
23 static struct spi_flash *flash;
26 * This function computes the length argument for the erase command.
27 * The length on which the command is to operate can be given in two forms:
28 * 1. <cmd> offset len - operate on <'offset', 'len')
29 * 2. <cmd> offset +len - operate on <'offset', 'round_up(len)')
30 * If the second form is used and the length doesn't fall on the
31 * sector boundary, than it will be adjusted to the next sector boundary.
32 * If it isn't in the flash, the function will fail (return -1).
34 * arg: length specification (i.e. both command arguments)
36 * len: computed length for operation
39 * -1: failure (bad format, bad address).
41 static int sf_parse_len_arg(char *arg, ulong *len)
44 char round_up_len; /* indicates if the "+length" form used */
53 len_arg = simple_strtoul(arg, &ep, 16);
54 if (ep == arg || *ep != '\0')
57 if (round_up_len && flash->sector_size > 0)
58 *len = ROUND(len_arg, flash->sector_size);
66 * This function takes a byte length and a delta unit of time to compute the
67 * approximate bytes per second
69 * @param len amount of bytes currently processed
70 * @param start_ms start time of processing in ms
71 * @return bytes per second if OK, 0 on error
73 static ulong bytes_per_second(unsigned int len, ulong start_ms)
75 /* less accurate but avoids overflow */
76 if (len >= ((unsigned int) -1) / 1024)
77 return len / (max(get_timer(start_ms) / 1024, 1UL));
79 return 1024 * len / max(get_timer(start_ms), 1UL);
82 static int do_spi_flash_probe(int argc, char * const argv[])
84 unsigned int bus = CONFIG_SF_DEFAULT_BUS;
85 unsigned int cs = CONFIG_SF_DEFAULT_CS;
86 /* In DM mode, defaults speed and mode will be taken from DT */
87 unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
88 unsigned int mode = CONFIG_SF_DEFAULT_MODE;
90 #ifdef CONFIG_DM_SPI_FLASH
91 struct udevice *new, *bus_dev;
94 struct spi_flash *new;
98 cs = simple_strtoul(argv[1], &endp, 0);
99 if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
106 cs = simple_strtoul(endp + 1, &endp, 0);
113 speed = simple_strtoul(argv[2], &endp, 0);
114 if (*argv[2] == 0 || *endp != 0)
118 mode = simple_strtoul(argv[3], &endp, 16);
119 if (*argv[3] == 0 || *endp != 0)
123 #ifdef CONFIG_DM_SPI_FLASH
124 /* Remove the old device, otherwise probe will just be a nop */
125 ret = spi_find_bus_and_cs(bus, cs, &bus_dev, &new);
127 device_remove(new, DM_REMOVE_NORMAL);
130 ret = spi_flash_probe_bus_cs(bus, cs, speed, mode, &new);
132 printf("Failed to initialize SPI flash at %u:%u (error %d)\n",
137 flash = dev_get_uclass_priv(new);
140 spi_flash_free(flash);
142 new = spi_flash_probe(bus, cs, speed, mode);
146 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
157 * Write a block of data to SPI flash, first checking if it is different from
158 * what is already there.
160 * If the data being written is the same, then *skipped is incremented by len.
162 * @param flash flash context pointer
163 * @param offset flash offset to write
164 * @param len number of bytes to write
165 * @param buf buffer to write from
166 * @param cmp_buf read buffer to use to compare data
167 * @param skipped Count of skipped data (incremented by this function)
168 * @return NULL if OK, else a string containing the stage which failed
170 static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
171 size_t len, const char *buf, char *cmp_buf, size_t *skipped)
173 char *ptr = (char *)buf;
175 debug("offset=%#x, sector_size=%#x, len=%#zx\n",
176 offset, flash->sector_size, len);
177 /* Read the entire sector so to allow for rewriting */
178 if (spi_flash_read(flash, offset, flash->sector_size, cmp_buf))
180 /* Compare only what is meaningful (len) */
181 if (memcmp(cmp_buf, buf, len) == 0) {
182 debug("Skip region %x size %zx: no change\n",
187 /* Erase the entire sector */
188 if (spi_flash_erase(flash, offset, flash->sector_size))
190 /* If it's a partial sector, copy the data into the temp-buffer */
191 if (len != flash->sector_size) {
192 memcpy(cmp_buf, buf, len);
195 /* Write one complete sector */
196 if (spi_flash_write(flash, offset, flash->sector_size, ptr))
203 * Update an area of SPI flash by erasing and writing any blocks which need
204 * to change. Existing blocks with the correct data are left unchanged.
206 * @param flash flash context pointer
207 * @param offset flash offset to write
208 * @param len number of bytes to write
209 * @param buf buffer to write from
210 * @return 0 if ok, 1 on error
212 static int spi_flash_update(struct spi_flash *flash, u32 offset,
213 size_t len, const char *buf)
215 const char *err_oper = NULL;
217 const char *end = buf + len;
218 size_t todo; /* number of bytes to do in this pass */
219 size_t skipped = 0; /* statistics */
220 const ulong start_time = get_timer(0);
222 const char *start_buf = buf;
225 if (end - buf >= 200)
226 scale = (end - buf) / 100;
227 cmp_buf = memalign(ARCH_DMA_MINALIGN, flash->sector_size);
229 ulong last_update = get_timer(0);
231 for (; buf < end && !err_oper; buf += todo, offset += todo) {
232 todo = min_t(size_t, end - buf, flash->sector_size);
233 if (get_timer(last_update) > 100) {
234 printf(" \rUpdating, %zu%% %lu B/s",
235 100 - (end - buf) / scale,
236 bytes_per_second(buf - start_buf,
238 last_update = get_timer(0);
240 err_oper = spi_flash_update_block(flash, offset, todo,
241 buf, cmp_buf, &skipped);
249 printf("SPI flash failed in %s step\n", err_oper);
253 delta = get_timer(start_time);
254 printf("%zu bytes written, %zu bytes skipped", len - skipped,
256 printf(" in %ld.%lds, speed %ld B/s\n",
257 delta / 1000, delta % 1000, bytes_per_second(len, start_time));
262 static int do_spi_flash_read_write(int argc, char * const argv[])
269 loff_t offset, len, maxsize;
274 addr = simple_strtoul(argv[1], &endp, 16);
275 if (*argv[1] == 0 || *endp != 0)
278 if (mtd_arg_off_size(argc - 2, &argv[2], &dev, &offset, &len,
279 &maxsize, MTD_DEV_TYPE_NOR, flash->size))
282 /* Consistency checking */
283 if (offset + len > flash->size) {
284 printf("ERROR: attempting %s past flash size (%#x)\n",
285 argv[0], flash->size);
289 buf = map_physmem(addr, len, MAP_WRBACK);
291 puts("Failed to map physical memory\n");
295 if (strcmp(argv[0], "update") == 0) {
296 ret = spi_flash_update(flash, offset, len, buf);
297 } else if (strncmp(argv[0], "read", 4) == 0 ||
298 strncmp(argv[0], "write", 5) == 0) {
301 read = strncmp(argv[0], "read", 4) == 0;
303 ret = spi_flash_read(flash, offset, len, buf);
305 ret = spi_flash_write(flash, offset, len, buf);
307 printf("SF: %zu bytes @ %#x %s: ", (size_t)len, (u32)offset,
308 read ? "Read" : "Written");
310 printf("ERROR %d\n", ret);
315 unmap_physmem(buf, len);
317 return ret == 0 ? 0 : 1;
320 static int do_spi_flash_erase(int argc, char * const argv[])
324 loff_t offset, len, maxsize;
330 if (mtd_arg_off(argv[1], &dev, &offset, &len, &maxsize,
331 MTD_DEV_TYPE_NOR, flash->size))
334 ret = sf_parse_len_arg(argv[2], &size);
338 /* Consistency checking */
339 if (offset + size > flash->size) {
340 printf("ERROR: attempting %s past flash size (%#x)\n",
341 argv[0], flash->size);
345 ret = spi_flash_erase(flash, offset, size);
346 printf("SF: %zu bytes @ %#x Erased: %s\n", (size_t)size, (u32)offset,
347 ret ? "ERROR" : "OK");
349 return ret == 0 ? 0 : 1;
352 static int do_spi_protect(int argc, char * const argv[])
361 if (!str2off(argv[2], &start)) {
362 puts("start sector is not a valid number\n");
366 if (!str2off(argv[3], &len)) {
367 puts("len is not a valid number\n");
371 if (strcmp(argv[1], "lock") == 0)
373 else if (strcmp(argv[1], "unlock") == 0)
376 return -1; /* Unknown parameter */
378 ret = spi_flash_protect(flash, start, len, prot);
380 return ret == 0 ? 0 : 1;
383 #ifdef CONFIG_CMD_SF_TEST
393 static char *stage_name[STAGE_COUNT] = {
404 unsigned time_ms[STAGE_COUNT];
407 static void show_time(struct test_info *test, int stage)
409 uint64_t speed; /* KiB/s */
410 int bps; /* Bits per second */
412 speed = (long long)test->bytes * 1000;
413 if (test->time_ms[stage])
414 do_div(speed, test->time_ms[stage] * 1024);
417 printf("%d %s: %u ticks, %d KiB/s %d.%03d Mbps\n", stage,
418 stage_name[stage], test->time_ms[stage],
419 (int)speed, bps / 1000, bps % 1000);
422 static void spi_test_next_stage(struct test_info *test)
424 test->time_ms[test->stage] = get_timer(test->base_ms);
425 show_time(test, test->stage);
426 test->base_ms = get_timer(0);
431 * Run a test on the SPI flash
433 * @param flash SPI flash to use
434 * @param buf Source buffer for data to write
435 * @param len Size of data to read/write
436 * @param offset Offset within flash to check
437 * @param vbuf Verification buffer
438 * @return 0 if ok, -1 on error
440 static int spi_flash_test(struct spi_flash *flash, uint8_t *buf, ulong len,
441 ulong offset, uint8_t *vbuf)
443 struct test_info test;
446 printf("SPI flash test:\n");
447 memset(&test, '\0', sizeof(test));
448 test.base_ms = get_timer(0);
450 if (spi_flash_erase(flash, offset, len)) {
451 printf("Erase failed\n");
454 spi_test_next_stage(&test);
456 if (spi_flash_read(flash, offset, len, vbuf)) {
457 printf("Check read failed\n");
460 for (i = 0; i < len; i++) {
461 if (vbuf[i] != 0xff) {
462 printf("Check failed at %d\n", i);
463 print_buffer(i, vbuf + i, 1,
464 min_t(uint, len - i, 0x40), 0);
468 spi_test_next_stage(&test);
470 if (spi_flash_write(flash, offset, len, buf)) {
471 printf("Write failed\n");
474 memset(vbuf, '\0', len);
475 spi_test_next_stage(&test);
477 if (spi_flash_read(flash, offset, len, vbuf)) {
478 printf("Read failed\n");
481 spi_test_next_stage(&test);
483 for (i = 0; i < len; i++) {
484 if (buf[i] != vbuf[i]) {
485 printf("Verify failed at %d, good data:\n", i);
486 print_buffer(i, buf + i, 1,
487 min_t(uint, len - i, 0x40), 0);
488 printf("Bad data:\n");
489 print_buffer(i, vbuf + i, 1,
490 min_t(uint, len - i, 0x40), 0);
494 printf("Test passed\n");
495 for (i = 0; i < STAGE_COUNT; i++)
501 static int do_spi_flash_test(int argc, char * const argv[])
503 unsigned long offset;
512 offset = simple_strtoul(argv[1], &endp, 16);
513 if (*argv[1] == 0 || *endp != 0)
515 len = simple_strtoul(argv[2], &endp, 16);
516 if (*argv[2] == 0 || *endp != 0)
519 vbuf = memalign(ARCH_DMA_MINALIGN, len);
521 printf("Cannot allocate memory (%lu bytes)\n", len);
524 buf = memalign(ARCH_DMA_MINALIGN, len);
527 printf("Cannot allocate memory (%lu bytes)\n", len);
531 from = map_sysmem(CONFIG_SYS_TEXT_BASE, 0);
532 memcpy(buf, from, len);
533 ret = spi_flash_test(flash, buf, len, offset, vbuf);
537 printf("Test failed\n");
543 #endif /* CONFIG_CMD_SF_TEST */
545 static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc,
551 /* need at least two arguments */
559 if (strcmp(cmd, "probe") == 0) {
560 ret = do_spi_flash_probe(argc, argv);
564 /* The remaining commands require a selected device */
566 puts("No SPI flash selected. Please run `sf probe'\n");
570 if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
571 strcmp(cmd, "update") == 0)
572 ret = do_spi_flash_read_write(argc, argv);
573 else if (strcmp(cmd, "erase") == 0)
574 ret = do_spi_flash_erase(argc, argv);
575 else if (strcmp(cmd, "protect") == 0)
576 ret = do_spi_protect(argc, argv);
577 #ifdef CONFIG_CMD_SF_TEST
578 else if (!strcmp(cmd, "test"))
579 ret = do_spi_flash_test(argc, argv);
589 return CMD_RET_USAGE;
592 #ifdef CONFIG_CMD_SF_TEST
593 #define SF_TEST_HELP "\nsf test offset len " \
594 "- run a very basic destructive test"
600 sf, 5, 1, do_spi_flash,
601 "SPI flash sub-system",
602 "probe [[bus:]cs] [hz] [mode] - init flash device on given SPI bus\n"
604 "sf read addr offset|partition len - read `len' bytes starting at\n"
605 " `offset' or from start of mtd\n"
606 " `partition'to memory at `addr'\n"
607 "sf write addr offset|partition len - write `len' bytes from memory\n"
608 " at `addr' to flash at `offset'\n"
609 " or to start of mtd `partition'\n"
610 "sf erase offset|partition [+]len - erase `len' bytes from `offset'\n"
611 " or from start of mtd `partition'\n"
612 " `+len' round up `len' to block size\n"
613 "sf update addr offset|partition len - erase and write `len' bytes from memory\n"
614 " at `addr' to flash at `offset'\n"
615 " or to start of mtd `partition'\n"
616 "sf protect lock/unlock sector len - protect/unprotect 'len' bytes starting\n"
617 " at address 'sector'\n"