1 // SPDX-License-Identifier: GPL-2.0+
3 * Command for accessing SPI flash.
5 * Copyright (C) 2008 Atmel Corporation
16 #include <spi_flash.h>
17 #include <asm/cache.h>
18 #include <jffs2/jffs2.h>
19 #include <linux/mtd/mtd.h>
22 #include <dm/device-internal.h>
24 #include "legacy-mtd-utils.h"
26 static struct spi_flash *flash;
29 * This function computes the length argument for the erase command.
30 * The length on which the command is to operate can be given in two forms:
31 * 1. <cmd> offset len - operate on <'offset', 'len')
32 * 2. <cmd> offset +len - operate on <'offset', 'round_up(len)')
33 * If the second form is used and the length doesn't fall on the
34 * sector boundary, than it will be adjusted to the next sector boundary.
35 * If it isn't in the flash, the function will fail (return -1).
37 * arg: length specification (i.e. both command arguments)
39 * len: computed length for operation
42 * -1: failure (bad format, bad address).
44 static int sf_parse_len_arg(char *arg, ulong *len)
47 char round_up_len; /* indicates if the "+length" form used */
56 len_arg = simple_strtoul(arg, &ep, 16);
57 if (ep == arg || *ep != '\0')
60 if (round_up_len && flash->sector_size > 0)
61 *len = ROUND(len_arg, flash->sector_size);
69 * This function takes a byte length and a delta unit of time to compute the
70 * approximate bytes per second
72 * @param len amount of bytes currently processed
73 * @param start_ms start time of processing in ms
74 * @return bytes per second if OK, 0 on error
76 static ulong bytes_per_second(unsigned int len, ulong start_ms)
78 /* less accurate but avoids overflow */
79 if (len >= ((unsigned int) -1) / 1024)
80 return len / (max(get_timer(start_ms) / 1024, 1UL));
82 return 1024 * len / max(get_timer(start_ms), 1UL);
85 static int do_spi_flash_probe(int argc, char *const argv[])
87 unsigned int bus = CONFIG_SF_DEFAULT_BUS;
88 unsigned int cs = CONFIG_SF_DEFAULT_CS;
89 /* In DM mode, defaults speed and mode will be taken from DT */
90 unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
91 unsigned int mode = CONFIG_SF_DEFAULT_MODE;
93 #ifdef CONFIG_DM_SPI_FLASH
94 struct udevice *new, *bus_dev;
97 struct spi_flash *new;
101 cs = simple_strtoul(argv[1], &endp, 0);
102 if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
109 cs = simple_strtoul(endp + 1, &endp, 0);
116 speed = simple_strtoul(argv[2], &endp, 0);
117 if (*argv[2] == 0 || *endp != 0)
121 mode = simple_strtoul(argv[3], &endp, 16);
122 if (*argv[3] == 0 || *endp != 0)
126 #ifdef CONFIG_DM_SPI_FLASH
127 /* Remove the old device, otherwise probe will just be a nop */
128 ret = spi_find_bus_and_cs(bus, cs, &bus_dev, &new);
130 device_remove(new, DM_REMOVE_NORMAL);
133 ret = spi_flash_probe_bus_cs(bus, cs, speed, mode, &new);
135 printf("Failed to initialize SPI flash at %u:%u (error %d)\n",
140 flash = dev_get_uclass_priv(new);
143 spi_flash_free(flash);
145 new = spi_flash_probe(bus, cs, speed, mode);
149 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
160 * Write a block of data to SPI flash, first checking if it is different from
161 * what is already there.
163 * If the data being written is the same, then *skipped is incremented by len.
165 * @param flash flash context pointer
166 * @param offset flash offset to write
167 * @param len number of bytes to write
168 * @param buf buffer to write from
169 * @param cmp_buf read buffer to use to compare data
170 * @param skipped Count of skipped data (incremented by this function)
171 * @return NULL if OK, else a string containing the stage which failed
173 static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
174 size_t len, const char *buf, char *cmp_buf, size_t *skipped)
176 char *ptr = (char *)buf;
178 debug("offset=%#x, sector_size=%#x, len=%#zx\n",
179 offset, flash->sector_size, len);
180 /* Read the entire sector so to allow for rewriting */
181 if (spi_flash_read(flash, offset, flash->sector_size, cmp_buf))
183 /* Compare only what is meaningful (len) */
184 if (memcmp(cmp_buf, buf, len) == 0) {
185 debug("Skip region %x size %zx: no change\n",
190 /* Erase the entire sector */
191 if (spi_flash_erase(flash, offset, flash->sector_size))
193 /* If it's a partial sector, copy the data into the temp-buffer */
194 if (len != flash->sector_size) {
195 memcpy(cmp_buf, buf, len);
198 /* Write one complete sector */
199 if (spi_flash_write(flash, offset, flash->sector_size, ptr))
206 * Update an area of SPI flash by erasing and writing any blocks which need
207 * to change. Existing blocks with the correct data are left unchanged.
209 * @param flash flash context pointer
210 * @param offset flash offset to write
211 * @param len number of bytes to write
212 * @param buf buffer to write from
213 * @return 0 if ok, 1 on error
215 static int spi_flash_update(struct spi_flash *flash, u32 offset,
216 size_t len, const char *buf)
218 const char *err_oper = NULL;
220 const char *end = buf + len;
221 size_t todo; /* number of bytes to do in this pass */
222 size_t skipped = 0; /* statistics */
223 const ulong start_time = get_timer(0);
225 const char *start_buf = buf;
228 if (end - buf >= 200)
229 scale = (end - buf) / 100;
230 cmp_buf = memalign(ARCH_DMA_MINALIGN, flash->sector_size);
232 ulong last_update = get_timer(0);
234 for (; buf < end && !err_oper; buf += todo, offset += todo) {
235 todo = min_t(size_t, end - buf, flash->sector_size);
236 if (get_timer(last_update) > 100) {
237 printf(" \rUpdating, %zu%% %lu B/s",
238 100 - (end - buf) / scale,
239 bytes_per_second(buf - start_buf,
241 last_update = get_timer(0);
243 err_oper = spi_flash_update_block(flash, offset, todo,
244 buf, cmp_buf, &skipped);
252 printf("SPI flash failed in %s step\n", err_oper);
256 delta = get_timer(start_time);
257 printf("%zu bytes written, %zu bytes skipped", len - skipped,
259 printf(" in %ld.%lds, speed %ld B/s\n",
260 delta / 1000, delta % 1000, bytes_per_second(len, start_time));
265 static int do_spi_flash_read_write(int argc, char *const argv[])
272 loff_t offset, len, maxsize;
277 addr = simple_strtoul(argv[1], &endp, 16);
278 if (*argv[1] == 0 || *endp != 0)
281 if (mtd_arg_off_size(argc - 2, &argv[2], &dev, &offset, &len,
282 &maxsize, MTD_DEV_TYPE_NOR, flash->size))
285 /* Consistency checking */
286 if (offset + len > flash->size) {
287 printf("ERROR: attempting %s past flash size (%#x)\n",
288 argv[0], flash->size);
292 buf = map_physmem(addr, len, MAP_WRBACK);
294 puts("Failed to map physical memory\n");
298 if (strcmp(argv[0], "update") == 0) {
299 ret = spi_flash_update(flash, offset, len, buf);
300 } else if (strncmp(argv[0], "read", 4) == 0 ||
301 strncmp(argv[0], "write", 5) == 0) {
304 read = strncmp(argv[0], "read", 4) == 0;
306 ret = spi_flash_read(flash, offset, len, buf);
308 ret = spi_flash_write(flash, offset, len, buf);
310 printf("SF: %zu bytes @ %#x %s: ", (size_t)len, (u32)offset,
311 read ? "Read" : "Written");
313 printf("ERROR %d\n", ret);
318 unmap_physmem(buf, len);
320 return ret == 0 ? 0 : 1;
323 static int do_spi_flash_erase(int argc, char *const argv[])
327 loff_t offset, len, maxsize;
333 if (mtd_arg_off(argv[1], &dev, &offset, &len, &maxsize,
334 MTD_DEV_TYPE_NOR, flash->size))
337 ret = sf_parse_len_arg(argv[2], &size);
341 /* Consistency checking */
342 if (offset + size > flash->size) {
343 printf("ERROR: attempting %s past flash size (%#x)\n",
344 argv[0], flash->size);
348 ret = spi_flash_erase(flash, offset, size);
349 printf("SF: %zu bytes @ %#x Erased: %s\n", (size_t)size, (u32)offset,
350 ret ? "ERROR" : "OK");
352 return ret == 0 ? 0 : 1;
355 static int do_spi_protect(int argc, char *const argv[])
364 if (!str2off(argv[2], &start)) {
365 puts("start sector is not a valid number\n");
369 if (!str2off(argv[3], &len)) {
370 puts("len is not a valid number\n");
374 if (strcmp(argv[1], "lock") == 0)
376 else if (strcmp(argv[1], "unlock") == 0)
379 return -1; /* Unknown parameter */
381 ret = spi_flash_protect(flash, start, len, prot);
383 return ret == 0 ? 0 : 1;
386 #ifdef CONFIG_CMD_SF_TEST
396 static char *stage_name[STAGE_COUNT] = {
407 unsigned time_ms[STAGE_COUNT];
410 static void show_time(struct test_info *test, int stage)
412 uint64_t speed; /* KiB/s */
413 int bps; /* Bits per second */
415 speed = (long long)test->bytes * 1000;
416 if (test->time_ms[stage])
417 do_div(speed, test->time_ms[stage] * 1024);
420 printf("%d %s: %u ticks, %d KiB/s %d.%03d Mbps\n", stage,
421 stage_name[stage], test->time_ms[stage],
422 (int)speed, bps / 1000, bps % 1000);
425 static void spi_test_next_stage(struct test_info *test)
427 test->time_ms[test->stage] = get_timer(test->base_ms);
428 show_time(test, test->stage);
429 test->base_ms = get_timer(0);
434 * Run a test on the SPI flash
436 * @param flash SPI flash to use
437 * @param buf Source buffer for data to write
438 * @param len Size of data to read/write
439 * @param offset Offset within flash to check
440 * @param vbuf Verification buffer
441 * @return 0 if ok, -1 on error
443 static int spi_flash_test(struct spi_flash *flash, uint8_t *buf, ulong len,
444 ulong offset, uint8_t *vbuf)
446 struct test_info test;
449 printf("SPI flash test:\n");
450 memset(&test, '\0', sizeof(test));
451 test.base_ms = get_timer(0);
453 if (spi_flash_erase(flash, offset, len)) {
454 printf("Erase failed\n");
457 spi_test_next_stage(&test);
459 if (spi_flash_read(flash, offset, len, vbuf)) {
460 printf("Check read failed\n");
463 for (i = 0; i < len; i++) {
464 if (vbuf[i] != 0xff) {
465 printf("Check failed at %d\n", i);
466 print_buffer(i, vbuf + i, 1,
467 min_t(uint, len - i, 0x40), 0);
471 spi_test_next_stage(&test);
473 if (spi_flash_write(flash, offset, len, buf)) {
474 printf("Write failed\n");
477 memset(vbuf, '\0', len);
478 spi_test_next_stage(&test);
480 if (spi_flash_read(flash, offset, len, vbuf)) {
481 printf("Read failed\n");
484 spi_test_next_stage(&test);
486 for (i = 0; i < len; i++) {
487 if (buf[i] != vbuf[i]) {
488 printf("Verify failed at %d, good data:\n", i);
489 print_buffer(i, buf + i, 1,
490 min_t(uint, len - i, 0x40), 0);
491 printf("Bad data:\n");
492 print_buffer(i, vbuf + i, 1,
493 min_t(uint, len - i, 0x40), 0);
497 printf("Test passed\n");
498 for (i = 0; i < STAGE_COUNT; i++)
504 static int do_spi_flash_test(int argc, char *const argv[])
506 unsigned long offset;
515 offset = simple_strtoul(argv[1], &endp, 16);
516 if (*argv[1] == 0 || *endp != 0)
518 len = simple_strtoul(argv[2], &endp, 16);
519 if (*argv[2] == 0 || *endp != 0)
522 vbuf = memalign(ARCH_DMA_MINALIGN, len);
524 printf("Cannot allocate memory (%lu bytes)\n", len);
527 buf = memalign(ARCH_DMA_MINALIGN, len);
530 printf("Cannot allocate memory (%lu bytes)\n", len);
534 from = map_sysmem(CONFIG_SYS_TEXT_BASE, 0);
535 memcpy(buf, from, len);
536 ret = spi_flash_test(flash, buf, len, offset, vbuf);
540 printf("Test failed\n");
546 #endif /* CONFIG_CMD_SF_TEST */
548 static int do_spi_flash(struct cmd_tbl *cmdtp, int flag, int argc,
554 /* need at least two arguments */
562 if (strcmp(cmd, "probe") == 0) {
563 ret = do_spi_flash_probe(argc, argv);
567 /* The remaining commands require a selected device */
569 puts("No SPI flash selected. Please run `sf probe'\n");
573 if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
574 strcmp(cmd, "update") == 0)
575 ret = do_spi_flash_read_write(argc, argv);
576 else if (strcmp(cmd, "erase") == 0)
577 ret = do_spi_flash_erase(argc, argv);
578 else if (strcmp(cmd, "protect") == 0)
579 ret = do_spi_protect(argc, argv);
580 #ifdef CONFIG_CMD_SF_TEST
581 else if (!strcmp(cmd, "test"))
582 ret = do_spi_flash_test(argc, argv);
592 return CMD_RET_USAGE;
595 #ifdef CONFIG_CMD_SF_TEST
596 #define SF_TEST_HELP "\nsf test offset len " \
597 "- run a very basic destructive test"
603 sf, 5, 1, do_spi_flash,
604 "SPI flash sub-system",
605 "probe [[bus:]cs] [hz] [mode] - init flash device on given SPI bus\n"
607 "sf read addr offset|partition len - read `len' bytes starting at\n"
608 " `offset' or from start of mtd\n"
609 " `partition'to memory at `addr'\n"
610 "sf write addr offset|partition len - write `len' bytes from memory\n"
611 " at `addr' to flash at `offset'\n"
612 " or to start of mtd `partition'\n"
613 "sf erase offset|partition [+]len - erase `len' bytes from `offset'\n"
614 " or from start of mtd `partition'\n"
615 " `+len' round up `len' to block size\n"
616 "sf update addr offset|partition len - erase and write `len' bytes from memory\n"
617 " at `addr' to flash at `offset'\n"
618 " or to start of mtd `partition'\n"
619 "sf protect lock/unlock sector len - protect/unprotect 'len' bytes starting\n"
620 " at address 'sector'\n"