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 = hextoul(arg, &ep);
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;
94 #if CONFIG_IS_ENABLED(DM_SPI_FLASH)
95 struct udevice *new, *bus_dev;
98 struct spi_flash *new;
102 cs = simple_strtoul(argv[1], &endp, 0);
103 if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
110 cs = simple_strtoul(endp + 1, &endp, 0);
117 speed = simple_strtoul(argv[2], &endp, 0);
118 if (*argv[2] == 0 || *endp != 0)
123 mode = hextoul(argv[3], &endp);
124 if (*argv[3] == 0 || *endp != 0)
129 #if CONFIG_IS_ENABLED(DM_SPI_FLASH)
130 /* Remove the old device, otherwise probe will just be a nop */
131 ret = spi_find_bus_and_cs(bus, cs, &bus_dev, &new);
133 device_remove(new, DM_REMOVE_NORMAL);
137 spi_flash_probe_bus_cs(bus, cs, &new);
138 flash = dev_get_uclass_priv(new);
140 flash = spi_flash_probe(bus, cs, speed, mode);
144 printf("Failed to initialize SPI flash at %u:%u (error %d)\n",
150 spi_flash_free(flash);
152 new = spi_flash_probe(bus, cs, speed, mode);
155 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
164 * Write a block of data to SPI flash, first checking if it is different from
165 * what is already there.
167 * If the data being written is the same, then *skipped is incremented by len.
169 * @param flash flash context pointer
170 * @param offset flash offset to write
171 * @param len number of bytes to write
172 * @param buf buffer to write from
173 * @param cmp_buf read buffer to use to compare data
174 * @param skipped Count of skipped data (incremented by this function)
175 * Return: NULL if OK, else a string containing the stage which failed
177 static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
178 size_t len, const char *buf, char *cmp_buf, size_t *skipped)
180 char *ptr = (char *)buf;
182 debug("offset=%#x, sector_size=%#x, len=%#zx\n",
183 offset, flash->sector_size, len);
184 /* Read the entire sector so to allow for rewriting */
185 if (spi_flash_read(flash, offset, flash->sector_size, cmp_buf))
187 /* Compare only what is meaningful (len) */
188 if (memcmp(cmp_buf, buf, len) == 0) {
189 debug("Skip region %x size %zx: no change\n",
194 /* Erase the entire sector */
195 if (spi_flash_erase(flash, offset, flash->sector_size))
197 /* If it's a partial sector, copy the data into the temp-buffer */
198 if (len != flash->sector_size) {
199 memcpy(cmp_buf, buf, len);
202 /* Write one complete sector */
203 if (spi_flash_write(flash, offset, flash->sector_size, ptr))
210 * Update an area of SPI flash by erasing and writing any blocks which need
211 * to change. Existing blocks with the correct data are left unchanged.
213 * @param flash flash context pointer
214 * @param offset flash offset to write
215 * @param len number of bytes to write
216 * @param buf buffer to write from
217 * Return: 0 if ok, 1 on error
219 static int spi_flash_update(struct spi_flash *flash, u32 offset,
220 size_t len, const char *buf)
222 const char *err_oper = NULL;
224 const char *end = buf + len;
225 size_t todo; /* number of bytes to do in this pass */
226 size_t skipped = 0; /* statistics */
227 const ulong start_time = get_timer(0);
229 const char *start_buf = buf;
232 if (end - buf >= 200)
233 scale = (end - buf) / 100;
234 cmp_buf = memalign(ARCH_DMA_MINALIGN, flash->sector_size);
236 ulong last_update = get_timer(0);
238 for (; buf < end && !err_oper; buf += todo, offset += todo) {
239 todo = min_t(size_t, end - buf, flash->sector_size);
240 if (get_timer(last_update) > 100) {
241 printf(" \rUpdating, %zu%% %lu B/s",
242 100 - (end - buf) / scale,
243 bytes_per_second(buf - start_buf,
245 last_update = get_timer(0);
247 err_oper = spi_flash_update_block(flash, offset, todo,
248 buf, cmp_buf, &skipped);
256 printf("SPI flash failed in %s step\n", err_oper);
260 delta = get_timer(start_time);
261 printf("%zu bytes written, %zu bytes skipped", len - skipped,
263 printf(" in %ld.%lds, speed %ld B/s\n",
264 delta / 1000, delta % 1000, bytes_per_second(len, start_time));
269 static int do_spi_flash_read_write(int argc, char *const argv[])
276 loff_t offset, len, maxsize;
281 addr = hextoul(argv[1], &endp);
282 if (*argv[1] == 0 || *endp != 0)
285 if (mtd_arg_off_size(argc - 2, &argv[2], &dev, &offset, &len,
286 &maxsize, MTD_DEV_TYPE_NOR, flash->size))
289 /* Consistency checking */
290 if (offset + len > flash->size) {
291 printf("ERROR: attempting %s past flash size (%#x)\n",
292 argv[0], flash->size);
296 if (strncmp(argv[0], "read", 4) != 0 && flash->flash_is_unlocked &&
297 !flash->flash_is_unlocked(flash, offset, len)) {
298 printf("ERROR: flash area is locked\n");
302 buf = map_physmem(addr, len, MAP_WRBACK);
304 puts("Failed to map physical memory\n");
308 if (strcmp(argv[0], "update") == 0) {
309 ret = spi_flash_update(flash, offset, len, buf);
310 } else if (strncmp(argv[0], "read", 4) == 0 ||
311 strncmp(argv[0], "write", 5) == 0) {
314 read = strncmp(argv[0], "read", 4) == 0;
316 ret = spi_flash_read(flash, offset, len, buf);
318 ret = spi_flash_write(flash, offset, len, buf);
320 printf("SF: %zu bytes @ %#x %s: ", (size_t)len, (u32)offset,
321 read ? "Read" : "Written");
323 printf("ERROR %d\n", ret);
328 unmap_physmem(buf, len);
330 return ret == 0 ? 0 : 1;
333 static int do_spi_flash_erase(int argc, char *const argv[])
337 loff_t offset, len, maxsize;
343 if (mtd_arg_off(argv[1], &dev, &offset, &len, &maxsize,
344 MTD_DEV_TYPE_NOR, flash->size))
347 ret = sf_parse_len_arg(argv[2], &size);
351 /* Consistency checking */
352 if (offset + size > flash->size) {
353 printf("ERROR: attempting %s past flash size (%#x)\n",
354 argv[0], flash->size);
358 if (flash->flash_is_unlocked &&
359 !flash->flash_is_unlocked(flash, offset, len)) {
360 printf("ERROR: flash area is locked\n");
364 ret = spi_flash_erase(flash, offset, size);
365 printf("SF: %zu bytes @ %#x Erased: ", (size_t)size, (u32)offset);
367 printf("ERROR %d\n", ret);
371 return ret == 0 ? 0 : 1;
374 static int do_spi_protect(int argc, char *const argv[])
383 if (!str2off(argv[2], &start)) {
384 puts("start sector is not a valid number\n");
388 if (!str2off(argv[3], &len)) {
389 puts("len is not a valid number\n");
393 if (strcmp(argv[1], "lock") == 0)
395 else if (strcmp(argv[1], "unlock") == 0)
398 return -1; /* Unknown parameter */
400 ret = spi_flash_protect(flash, start, len, prot);
402 return ret == 0 ? 0 : 1;
414 static const char *stage_name[STAGE_COUNT] = {
425 unsigned time_ms[STAGE_COUNT];
428 static void show_time(struct test_info *test, int stage)
430 uint64_t speed; /* KiB/s */
431 int bps; /* Bits per second */
433 speed = (long long)test->bytes * 1000;
434 if (test->time_ms[stage])
435 do_div(speed, test->time_ms[stage] * 1024);
438 printf("%d %s: %u ticks, %d KiB/s %d.%03d Mbps\n", stage,
439 stage_name[stage], test->time_ms[stage],
440 (int)speed, bps / 1000, bps % 1000);
443 static void spi_test_next_stage(struct test_info *test)
445 test->time_ms[test->stage] = get_timer(test->base_ms);
446 show_time(test, test->stage);
447 test->base_ms = get_timer(0);
452 * Run a test on the SPI flash
454 * @param flash SPI flash to use
455 * @param buf Source buffer for data to write
456 * @param len Size of data to read/write
457 * @param offset Offset within flash to check
458 * @param vbuf Verification buffer
459 * Return: 0 if ok, -1 on error
461 static int spi_flash_test(struct spi_flash *flash, uint8_t *buf, ulong len,
462 ulong offset, uint8_t *vbuf)
464 struct test_info test;
467 printf("SPI flash test:\n");
468 memset(&test, '\0', sizeof(test));
469 test.base_ms = get_timer(0);
471 err = spi_flash_erase(flash, offset, len);
473 printf("Erase failed (err = %d)\n", err);
476 spi_test_next_stage(&test);
478 err = spi_flash_read(flash, offset, len, vbuf);
480 printf("Check read failed (err = %d)\n", err);
483 for (i = 0; i < len; i++) {
484 if (vbuf[i] != 0xff) {
485 printf("Check failed at %d\n", i);
486 print_buffer(i, vbuf + i, 1,
487 min_t(uint, len - i, 0x40), 0);
491 spi_test_next_stage(&test);
493 err = spi_flash_write(flash, offset, len, buf);
495 printf("Write failed (err = %d)\n", err);
498 memset(vbuf, '\0', len);
499 spi_test_next_stage(&test);
501 err = spi_flash_read(flash, offset, len, vbuf);
503 printf("Read failed (ret = %d)\n", err);
506 spi_test_next_stage(&test);
508 for (i = 0; i < len; i++) {
509 if (buf[i] != vbuf[i]) {
510 printf("Verify failed at %d, good data:\n", i);
511 print_buffer(i, buf + i, 1,
512 min_t(uint, len - i, 0x40), 0);
513 printf("Bad data:\n");
514 print_buffer(i, vbuf + i, 1,
515 min_t(uint, len - i, 0x40), 0);
519 printf("Test passed\n");
520 for (i = 0; i < STAGE_COUNT; i++)
526 static int do_spi_flash_test(int argc, char *const argv[])
528 unsigned long offset;
537 offset = hextoul(argv[1], &endp);
538 if (*argv[1] == 0 || *endp != 0)
540 len = hextoul(argv[2], &endp);
541 if (*argv[2] == 0 || *endp != 0)
544 vbuf = memalign(ARCH_DMA_MINALIGN, len);
546 printf("Cannot allocate memory (%lu bytes)\n", len);
549 buf = memalign(ARCH_DMA_MINALIGN, len);
552 printf("Cannot allocate memory (%lu bytes)\n", len);
556 from = map_sysmem(CONFIG_SYS_TEXT_BASE, 0);
557 memcpy(buf, from, len);
558 ret = spi_flash_test(flash, buf, len, offset, vbuf);
562 printf("Test failed\n");
569 static int do_spi_flash(struct cmd_tbl *cmdtp, int flag, int argc,
575 /* need at least two arguments */
583 if (strcmp(cmd, "probe") == 0) {
584 ret = do_spi_flash_probe(argc, argv);
588 /* The remaining commands require a selected device */
590 puts("No SPI flash selected. Please run `sf probe'\n");
594 if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
595 strcmp(cmd, "update") == 0)
596 ret = do_spi_flash_read_write(argc, argv);
597 else if (strcmp(cmd, "erase") == 0)
598 ret = do_spi_flash_erase(argc, argv);
599 else if (strcmp(cmd, "protect") == 0)
600 ret = do_spi_protect(argc, argv);
601 else if (IS_ENABLED(CONFIG_CMD_SF_TEST) && !strcmp(cmd, "test"))
602 ret = do_spi_flash_test(argc, argv);
611 return CMD_RET_USAGE;
614 #ifdef CONFIG_SYS_LONGHELP
615 static const char long_help[] =
616 "probe [[bus:]cs] [hz] [mode] - init flash device on given SPI bus\n"
618 "sf read addr offset|partition len - read `len' bytes starting at\n"
619 " `offset' or from start of mtd\n"
620 " `partition'to memory at `addr'\n"
621 "sf write addr offset|partition len - write `len' bytes from memory\n"
622 " at `addr' to flash at `offset'\n"
623 " or to start of mtd `partition'\n"
624 "sf erase offset|partition [+]len - erase `len' bytes from `offset'\n"
625 " or from start of mtd `partition'\n"
626 " `+len' round up `len' to block size\n"
627 "sf update addr offset|partition len - erase and write `len' bytes from memory\n"
628 " at `addr' to flash at `offset'\n"
629 " or to start of mtd `partition'\n"
630 "sf protect lock/unlock sector len - protect/unprotect 'len' bytes starting\n"
631 " at address 'sector'"
632 #ifdef CONFIG_CMD_SF_TEST
633 "\nsf test offset len - run a very basic destructive test"
635 #endif /* CONFIG_SYS_LONGHELP */
639 sf, 5, 1, do_spi_flash,
640 "SPI flash sub-system", long_help