2 * Command for accessing SPI flash.
4 * Copyright (C) 2008 Atmel Corporation
6 * SPDX-License-Identifier: GPL-2.0+
15 #include <spi_flash.h>
16 #include <jffs2/jffs2.h>
17 #include <linux/mtd/mtd.h>
20 #include <dm/device-internal.h>
22 static struct spi_flash *flash;
25 * This function computes the length argument for the erase command.
26 * The length on which the command is to operate can be given in two forms:
27 * 1. <cmd> offset len - operate on <'offset', 'len')
28 * 2. <cmd> offset +len - operate on <'offset', 'round_up(len)')
29 * If the second form is used and the length doesn't fall on the
30 * sector boundary, than it will be adjusted to the next sector boundary.
31 * If it isn't in the flash, the function will fail (return -1).
33 * arg: length specification (i.e. both command arguments)
35 * len: computed length for operation
38 * -1: failure (bad format, bad address).
40 static int sf_parse_len_arg(char *arg, ulong *len)
43 char round_up_len; /* indicates if the "+length" form used */
52 len_arg = simple_strtoul(arg, &ep, 16);
53 if (ep == arg || *ep != '\0')
56 if (round_up_len && flash->sector_size > 0)
57 *len = ROUND(len_arg, flash->sector_size);
65 * This function takes a byte length and a delta unit of time to compute the
66 * approximate bytes per second
68 * @param len amount of bytes currently processed
69 * @param start_ms start time of processing in ms
70 * @return bytes per second if OK, 0 on error
72 static ulong bytes_per_second(unsigned int len, ulong start_ms)
74 /* less accurate but avoids overflow */
75 if (len >= ((unsigned int) -1) / 1024)
76 return len / (max(get_timer(start_ms) / 1024, 1UL));
78 return 1024 * len / max(get_timer(start_ms), 1UL);
81 static int do_spi_flash_probe(int argc, char * const argv[])
83 unsigned int bus = CONFIG_SF_DEFAULT_BUS;
84 unsigned int cs = CONFIG_SF_DEFAULT_CS;
85 unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
86 unsigned int mode = CONFIG_SF_DEFAULT_MODE;
88 #ifdef CONFIG_DM_SPI_FLASH
89 struct udevice *new, *bus_dev;
92 struct spi_flash *new;
96 cs = simple_strtoul(argv[1], &endp, 0);
97 if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
104 cs = simple_strtoul(endp + 1, &endp, 0);
111 speed = simple_strtoul(argv[2], &endp, 0);
112 if (*argv[2] == 0 || *endp != 0)
116 mode = simple_strtoul(argv[3], &endp, 16);
117 if (*argv[3] == 0 || *endp != 0)
121 #ifdef CONFIG_DM_SPI_FLASH
122 /* Remove the old device, otherwise probe will just be a nop */
123 ret = spi_find_bus_and_cs(bus, cs, &bus_dev, &new);
129 ret = spi_flash_probe_bus_cs(bus, cs, speed, mode, &new);
131 printf("Failed to initialize SPI flash at %u:%u (error %d)\n",
136 flash = dev_get_uclass_priv(new);
139 spi_flash_free(flash);
141 new = spi_flash_probe(bus, cs, speed, mode);
145 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
156 * Write a block of data to SPI flash, first checking if it is different from
157 * what is already there.
159 * If the data being written is the same, then *skipped is incremented by len.
161 * @param flash flash context pointer
162 * @param offset flash offset to write
163 * @param len number of bytes to write
164 * @param buf buffer to write from
165 * @param cmp_buf read buffer to use to compare data
166 * @param skipped Count of skipped data (incremented by this function)
167 * @return NULL if OK, else a string containing the stage which failed
169 static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
170 size_t len, const char *buf, char *cmp_buf, size_t *skipped)
172 char *ptr = (char *)buf;
174 debug("offset=%#x, sector_size=%#x, len=%#zx\n",
175 offset, flash->sector_size, len);
176 /* Read the entire sector so to allow for rewriting */
177 if (spi_flash_read(flash, offset, flash->sector_size, cmp_buf))
179 /* Compare only what is meaningful (len) */
180 if (memcmp(cmp_buf, buf, len) == 0) {
181 debug("Skip region %x size %zx: no change\n",
186 /* Erase the entire sector */
187 if (spi_flash_erase(flash, offset, flash->sector_size))
189 /* If it's a partial sector, copy the data into the temp-buffer */
190 if (len != flash->sector_size) {
191 memcpy(cmp_buf, buf, len);
194 /* Write one complete sector */
195 if (spi_flash_write(flash, offset, flash->sector_size, ptr))
202 * Update an area of SPI flash by erasing and writing any blocks which need
203 * to change. Existing blocks with the correct data are left unchanged.
205 * @param flash flash context pointer
206 * @param offset flash offset to write
207 * @param len number of bytes to write
208 * @param buf buffer to write from
209 * @return 0 if ok, 1 on error
211 static int spi_flash_update(struct spi_flash *flash, u32 offset,
212 size_t len, const char *buf)
214 const char *err_oper = NULL;
216 const char *end = buf + len;
217 size_t todo; /* number of bytes to do in this pass */
218 size_t skipped = 0; /* statistics */
219 const ulong start_time = get_timer(0);
221 const char *start_buf = buf;
224 if (end - buf >= 200)
225 scale = (end - buf) / 100;
226 cmp_buf = malloc(flash->sector_size);
228 ulong last_update = get_timer(0);
230 for (; buf < end && !err_oper; buf += todo, offset += todo) {
231 todo = min_t(size_t, end - buf, flash->sector_size);
232 if (get_timer(last_update) > 100) {
233 printf(" \rUpdating, %zu%% %lu B/s",
234 100 - (end - buf) / scale,
235 bytes_per_second(buf - start_buf,
237 last_update = get_timer(0);
239 err_oper = spi_flash_update_block(flash, offset, todo,
240 buf, cmp_buf, &skipped);
248 printf("SPI flash failed in %s step\n", err_oper);
252 delta = get_timer(start_time);
253 printf("%zu bytes written, %zu bytes skipped", len - skipped,
255 printf(" in %ld.%lds, speed %ld B/s\n",
256 delta / 1000, delta % 1000, bytes_per_second(len, start_time));
261 static int do_spi_flash_read_write(int argc, char * const argv[])
268 loff_t offset, len, maxsize;
273 addr = simple_strtoul(argv[1], &endp, 16);
274 if (*argv[1] == 0 || *endp != 0)
277 if (mtd_arg_off_size(argc - 2, &argv[2], &dev, &offset, &len,
278 &maxsize, MTD_DEV_TYPE_NOR, flash->size))
281 /* Consistency checking */
282 if (offset + len > flash->size) {
283 printf("ERROR: attempting %s past flash size (%#x)\n",
284 argv[0], flash->size);
288 buf = map_physmem(addr, len, MAP_WRBACK);
290 puts("Failed to map physical memory\n");
294 if (strcmp(argv[0], "update") == 0) {
295 ret = spi_flash_update(flash, offset, len, buf);
296 } else if (strncmp(argv[0], "read", 4) == 0 ||
297 strncmp(argv[0], "write", 5) == 0) {
300 read = strncmp(argv[0], "read", 4) == 0;
302 ret = spi_flash_read(flash, offset, len, buf);
304 ret = spi_flash_write(flash, offset, len, buf);
306 printf("SF: %zu bytes @ %#x %s: ", (size_t)len, (u32)offset,
307 read ? "Read" : "Written");
309 printf("ERROR %d\n", ret);
314 unmap_physmem(buf, len);
316 return ret == 0 ? 0 : 1;
319 static int do_spi_flash_erase(int argc, char * const argv[])
323 loff_t offset, len, maxsize;
329 if (mtd_arg_off(argv[1], &dev, &offset, &len, &maxsize,
330 MTD_DEV_TYPE_NOR, flash->size))
333 ret = sf_parse_len_arg(argv[2], &size);
337 /* Consistency checking */
338 if (offset + size > flash->size) {
339 printf("ERROR: attempting %s past flash size (%#x)\n",
340 argv[0], flash->size);
344 ret = spi_flash_erase(flash, offset, size);
345 printf("SF: %zu bytes @ %#x Erased: %s\n", (size_t)size, (u32)offset,
346 ret ? "ERROR" : "OK");
348 return ret == 0 ? 0 : 1;
351 #ifdef CONFIG_CMD_SF_TEST
361 static char *stage_name[STAGE_COUNT] = {
372 unsigned time_ms[STAGE_COUNT];
375 static void show_time(struct test_info *test, int stage)
377 uint64_t speed; /* KiB/s */
378 int bps; /* Bits per second */
380 speed = (long long)test->bytes * 1000;
381 if (test->time_ms[stage])
382 do_div(speed, test->time_ms[stage] * 1024);
385 printf("%d %s: %d ticks, %d KiB/s %d.%03d Mbps\n", stage,
386 stage_name[stage], test->time_ms[stage],
387 (int)speed, bps / 1000, bps % 1000);
390 static void spi_test_next_stage(struct test_info *test)
392 test->time_ms[test->stage] = get_timer(test->base_ms);
393 show_time(test, test->stage);
394 test->base_ms = get_timer(0);
399 * Run a test on the SPI flash
401 * @param flash SPI flash to use
402 * @param buf Source buffer for data to write
403 * @param len Size of data to read/write
404 * @param offset Offset within flash to check
405 * @param vbuf Verification buffer
406 * @return 0 if ok, -1 on error
408 static int spi_flash_test(struct spi_flash *flash, uint8_t *buf, ulong len,
409 ulong offset, uint8_t *vbuf)
411 struct test_info test;
414 printf("SPI flash test:\n");
415 memset(&test, '\0', sizeof(test));
416 test.base_ms = get_timer(0);
418 if (spi_flash_erase(flash, offset, len)) {
419 printf("Erase failed\n");
422 spi_test_next_stage(&test);
424 if (spi_flash_read(flash, offset, len, vbuf)) {
425 printf("Check read failed\n");
428 for (i = 0; i < len; i++) {
429 if (vbuf[i] != 0xff) {
430 printf("Check failed at %d\n", i);
431 print_buffer(i, vbuf + i, 1,
432 min_t(uint, len - i, 0x40), 0);
436 spi_test_next_stage(&test);
438 if (spi_flash_write(flash, offset, len, buf)) {
439 printf("Write failed\n");
442 memset(vbuf, '\0', len);
443 spi_test_next_stage(&test);
445 if (spi_flash_read(flash, offset, len, vbuf)) {
446 printf("Read failed\n");
449 spi_test_next_stage(&test);
451 for (i = 0; i < len; i++) {
452 if (buf[i] != vbuf[i]) {
453 printf("Verify failed at %d, good data:\n", i);
454 print_buffer(i, buf + i, 1,
455 min_t(uint, len - i, 0x40), 0);
456 printf("Bad data:\n");
457 print_buffer(i, vbuf + i, 1,
458 min_t(uint, len - i, 0x40), 0);
462 printf("Test passed\n");
463 for (i = 0; i < STAGE_COUNT; i++)
469 static int do_spi_flash_test(int argc, char * const argv[])
471 unsigned long offset;
480 offset = simple_strtoul(argv[1], &endp, 16);
481 if (*argv[1] == 0 || *endp != 0)
483 len = simple_strtoul(argv[2], &endp, 16);
484 if (*argv[2] == 0 || *endp != 0)
489 printf("Cannot allocate memory (%lu bytes)\n", len);
495 printf("Cannot allocate memory (%lu bytes)\n", len);
499 from = map_sysmem(CONFIG_SYS_TEXT_BASE, 0);
500 memcpy(buf, from, len);
501 ret = spi_flash_test(flash, buf, len, offset, vbuf);
505 printf("Test failed\n");
511 #endif /* CONFIG_CMD_SF_TEST */
513 static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc,
519 /* need at least two arguments */
527 if (strcmp(cmd, "probe") == 0) {
528 ret = do_spi_flash_probe(argc, argv);
532 /* The remaining commands require a selected device */
534 puts("No SPI flash selected. Please run `sf probe'\n");
538 if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
539 strcmp(cmd, "update") == 0)
540 ret = do_spi_flash_read_write(argc, argv);
541 else if (strcmp(cmd, "erase") == 0)
542 ret = do_spi_flash_erase(argc, argv);
543 #ifdef CONFIG_CMD_SF_TEST
544 else if (!strcmp(cmd, "test"))
545 ret = do_spi_flash_test(argc, argv);
555 return CMD_RET_USAGE;
558 #ifdef CONFIG_CMD_SF_TEST
559 #define SF_TEST_HELP "\nsf test offset len " \
560 "- run a very basic destructive test"
566 sf, 5, 1, do_spi_flash,
567 "SPI flash sub-system",
568 "probe [[bus:]cs] [hz] [mode] - init flash device on given SPI bus\n"
570 "sf read addr offset|partition len - read `len' bytes starting at\n"
571 " `offset' or from start of mtd\n"
572 " `partition'to memory at `addr'\n"
573 "sf write addr offset|partition len - write `len' bytes from memory\n"
574 " at `addr' to flash at `offset'\n"
575 " or to start of mtd `partition'\n"
576 "sf erase offset|partition [+]len - erase `len' bytes from `offset'\n"
577 " or from start of mtd `partition'\n"
578 " `+len' round up `len' to block size\n"
579 "sf update addr offset|partition len - erase and write `len' bytes from memory\n"
580 " at `addr' to flash at `offset'\n"
581 " or to start of mtd `partition'\n"