2 * Command for accessing SPI flash.
4 * Copyright (C) 2008 Atmel Corporation
5 * Licensed under the GPL-2 or later.
11 #include <spi_flash.h>
15 #ifndef CONFIG_SF_DEFAULT_SPEED
16 # define CONFIG_SF_DEFAULT_SPEED 1000000
18 #ifndef CONFIG_SF_DEFAULT_MODE
19 # define CONFIG_SF_DEFAULT_MODE SPI_MODE_3
21 #ifndef CONFIG_SF_DEFAULT_CS
22 # define CONFIG_SF_DEFAULT_CS 0
24 #ifndef CONFIG_SF_DEFAULT_BUS
25 # define CONFIG_SF_DEFAULT_BUS 0
28 static struct spi_flash *flash;
32 * This function computes the length argument for the erase command.
33 * The length on which the command is to operate can be given in two forms:
34 * 1. <cmd> offset len - operate on <'offset', 'len')
35 * 2. <cmd> offset +len - operate on <'offset', 'round_up(len)')
36 * If the second form is used and the length doesn't fall on the
37 * sector boundary, than it will be adjusted to the next sector boundary.
38 * If it isn't in the flash, the function will fail (return -1).
40 * arg: length specification (i.e. both command arguments)
42 * len: computed length for operation
45 * -1: failure (bad format, bad address).
47 static int sf_parse_len_arg(char *arg, ulong *len)
50 char round_up_len; /* indicates if the "+length" form used */
59 len_arg = simple_strtoul(arg, &ep, 16);
60 if (ep == arg || *ep != '\0')
63 if (round_up_len && flash->sector_size > 0)
64 *len = ROUND(len_arg, flash->sector_size);
72 * This function takes a byte length and a delta unit of time to compute the
73 * approximate bytes per second
75 * @param len amount of bytes currently processed
76 * @param start_ms start time of processing in ms
77 * @return bytes per second if OK, 0 on error
79 static ulong bytes_per_second(unsigned int len, ulong start_ms)
81 /* less accurate but avoids overflow */
82 if (len >= ((unsigned int) -1) / 1024)
83 return len / (max(get_timer(start_ms) / 1024, 1));
85 return 1024 * len / max(get_timer(start_ms), 1);
88 static int do_spi_flash_probe(int argc, char * const argv[])
90 unsigned int bus = CONFIG_SF_DEFAULT_BUS;
91 unsigned int cs = CONFIG_SF_DEFAULT_CS;
92 unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
93 unsigned int mode = CONFIG_SF_DEFAULT_MODE;
95 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 new = spi_flash_probe(bus, cs, speed, mode);
125 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
130 spi_flash_free(flash);
137 * Write a block of data to SPI flash, first checking if it is different from
138 * what is already there.
140 * If the data being written is the same, then *skipped is incremented by len.
142 * @param flash flash context pointer
143 * @param offset flash offset to write
144 * @param len number of bytes to write
145 * @param buf buffer to write from
146 * @param cmp_buf read buffer to use to compare data
147 * @param skipped Count of skipped data (incremented by this function)
148 * @return NULL if OK, else a string containing the stage which failed
150 static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
151 size_t len, const char *buf, char *cmp_buf, size_t *skipped)
153 debug("offset=%#x, sector_size=%#x, len=%#zx\n",
154 offset, flash->sector_size, len);
155 /* Read the entire sector so to allow for rewriting */
156 if (spi_flash_read(flash, offset, flash->sector_size, cmp_buf))
158 /* Compare only what is meaningful (len) */
159 if (memcmp(cmp_buf, buf, len) == 0) {
160 debug("Skip region %x size %zx: no change\n",
165 /* Erase the entire sector */
166 if (spi_flash_erase(flash, offset, flash->sector_size))
168 /* Write the initial part of the block from the source */
169 if (spi_flash_write(flash, offset, len, buf))
171 /* If it's a partial sector, rewrite the existing part */
172 if (len != flash->sector_size) {
173 /* Rewrite the original data to the end of the sector */
174 if (spi_flash_write(flash, offset + len,
175 flash->sector_size - len, &cmp_buf[len]))
183 * Update an area of SPI flash by erasing and writing any blocks which need
184 * to change. Existing blocks with the correct data are left unchanged.
186 * @param flash flash context pointer
187 * @param offset flash offset to write
188 * @param len number of bytes to write
189 * @param buf buffer to write from
190 * @return 0 if ok, 1 on error
192 static int spi_flash_update(struct spi_flash *flash, u32 offset,
193 size_t len, const char *buf)
195 const char *err_oper = NULL;
197 const char *end = buf + len;
198 size_t todo; /* number of bytes to do in this pass */
199 size_t skipped = 0; /* statistics */
200 const ulong start_time = get_timer(0);
202 const char *start_buf = buf;
205 if (end - buf >= 200)
206 scale = (end - buf) / 100;
207 cmp_buf = malloc(flash->sector_size);
209 ulong last_update = get_timer(0);
211 for (; buf < end && !err_oper; buf += todo, offset += todo) {
212 todo = min(end - buf, flash->sector_size);
213 if (get_timer(last_update) > 100) {
214 printf(" \rUpdating, %zu%% %lu B/s",
215 100 - (end - buf) / scale,
216 bytes_per_second(buf - start_buf,
218 last_update = get_timer(0);
220 err_oper = spi_flash_update_block(flash, offset, todo,
221 buf, cmp_buf, &skipped);
229 printf("SPI flash failed in %s step\n", err_oper);
233 delta = get_timer(start_time);
234 printf("%zu bytes written, %zu bytes skipped", len - skipped,
236 printf(" in %ld.%lds, speed %ld B/s\n",
237 delta / 1000, delta % 1000, bytes_per_second(len, start_time));
242 static int do_spi_flash_read_write(int argc, char * const argv[])
245 unsigned long offset;
254 addr = simple_strtoul(argv[1], &endp, 16);
255 if (*argv[1] == 0 || *endp != 0)
257 offset = simple_strtoul(argv[2], &endp, 16);
258 if (*argv[2] == 0 || *endp != 0)
260 len = simple_strtoul(argv[3], &endp, 16);
261 if (*argv[3] == 0 || *endp != 0)
264 /* Consistency checking */
265 if (offset + len > flash->size) {
266 printf("ERROR: attempting %s past flash size (%#x)\n",
267 argv[0], flash->size);
271 buf = map_physmem(addr, len, MAP_WRBACK);
273 puts("Failed to map physical memory\n");
277 if (strcmp(argv[0], "update") == 0) {
278 ret = spi_flash_update(flash, offset, len, buf);
279 } else if (strncmp(argv[0], "read", 4) == 0 ||
280 strncmp(argv[0], "write", 5) == 0) {
283 read = strncmp(argv[0], "read", 4) == 0;
285 ret = spi_flash_read(flash, offset, len, buf);
287 ret = spi_flash_write(flash, offset, len, buf);
289 printf("SF: %zu bytes @ %#x %s: %s\n", (size_t)len, (u32)offset,
290 read ? "Read" : "Written", ret ? "ERROR" : "OK");
293 unmap_physmem(buf, len);
295 return ret == 0 ? 0 : 1;
298 static int do_spi_flash_erase(int argc, char * const argv[])
300 unsigned long offset;
308 offset = simple_strtoul(argv[1], &endp, 16);
309 if (*argv[1] == 0 || *endp != 0)
312 ret = sf_parse_len_arg(argv[2], &len);
316 /* Consistency checking */
317 if (offset + len > flash->size) {
318 printf("ERROR: attempting %s past flash size (%#x)\n",
319 argv[0], flash->size);
323 ret = spi_flash_erase(flash, offset, len);
324 printf("SF: %zu bytes @ %#x Erased: %s\n", (size_t)len, (u32)offset,
325 ret ? "ERROR" : "OK");
327 return ret == 0 ? 0 : 1;
330 #ifdef CONFIG_CMD_SF_TEST
340 static char *stage_name[STAGE_COUNT] = {
351 unsigned time_ms[STAGE_COUNT];
354 static void show_time(struct test_info *test, int stage)
356 uint64_t speed; /* KiB/s */
357 int bps; /* Bits per second */
359 speed = (long long)test->bytes * 1000;
360 do_div(speed, test->time_ms[stage] * 1024);
363 printf("%d %s: %d ticks, %d KiB/s %d.%03d Mbps\n", stage,
364 stage_name[stage], test->time_ms[stage],
365 (int)speed, bps / 1000, bps % 1000);
368 static void spi_test_next_stage(struct test_info *test)
370 test->time_ms[test->stage] = get_timer(test->base_ms);
371 show_time(test, test->stage);
372 test->base_ms = get_timer(0);
377 * Run a test on the SPI flash
379 * @param flash SPI flash to use
380 * @param buf Source buffer for data to write
381 * @param len Size of data to read/write
382 * @param offset Offset within flash to check
383 * @param vbuf Verification buffer
384 * @return 0 if ok, -1 on error
386 static int spi_flash_test(struct spi_flash *flash, uint8_t *buf, ulong len,
387 ulong offset, uint8_t *vbuf)
389 struct test_info test;
392 printf("SPI flash test:\n");
393 memset(&test, '\0', sizeof(test));
394 test.base_ms = get_timer(0);
396 if (spi_flash_erase(flash, offset, len)) {
397 printf("Erase failed\n");
400 spi_test_next_stage(&test);
402 if (spi_flash_read(flash, offset, len, vbuf)) {
403 printf("Check read failed\n");
406 for (i = 0; i < len; i++) {
407 if (vbuf[i] != 0xff) {
408 printf("Check failed at %d\n", i);
409 print_buffer(i, vbuf + i, 1, min(len - i, 0x40), 0);
413 spi_test_next_stage(&test);
415 if (spi_flash_write(flash, offset, len, buf)) {
416 printf("Write failed\n");
419 memset(vbuf, '\0', len);
420 spi_test_next_stage(&test);
422 if (spi_flash_read(flash, offset, len, vbuf)) {
423 printf("Read failed\n");
426 spi_test_next_stage(&test);
428 for (i = 0; i < len; i++) {
429 if (buf[i] != vbuf[i]) {
430 printf("Verify failed at %d, good data:\n", i);
431 print_buffer(i, buf + i, 1, min(len - i, 0x40), 0);
432 printf("Bad data:\n");
433 print_buffer(i, vbuf + i, 1, min(len - i, 0x40), 0);
437 printf("Test passed\n");
438 for (i = 0; i < STAGE_COUNT; i++)
444 static int do_spi_flash_test(int argc, char * const argv[])
446 unsigned long offset;
448 uint8_t *buf = (uint8_t *)CONFIG_SYS_TEXT_BASE;
453 offset = simple_strtoul(argv[1], &endp, 16);
454 if (*argv[1] == 0 || *endp != 0)
456 len = simple_strtoul(argv[2], &endp, 16);
457 if (*argv[2] == 0 || *endp != 0)
462 printf("Cannot allocate memory\n");
468 printf("Cannot allocate memory\n");
472 memcpy(buf, (char *)CONFIG_SYS_TEXT_BASE, len);
473 ret = spi_flash_test(flash, buf, len, offset, vbuf);
477 printf("Test failed\n");
483 #endif /* CONFIG_CMD_SF_TEST */
485 static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc,
491 /* need at least two arguments */
499 if (strcmp(cmd, "probe") == 0) {
500 ret = do_spi_flash_probe(argc, argv);
504 /* The remaining commands require a selected device */
506 puts("No SPI flash selected. Please run `sf probe'\n");
510 if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
511 strcmp(cmd, "update") == 0)
512 ret = do_spi_flash_read_write(argc, argv);
513 else if (strcmp(cmd, "erase") == 0)
514 ret = do_spi_flash_erase(argc, argv);
515 #ifdef CONFIG_CMD_SF_TEST
516 else if (!strcmp(cmd, "test"))
517 ret = do_spi_flash_test(argc, argv);
527 return CMD_RET_USAGE;
530 #ifdef CONFIG_CMD_SF_TEST
531 #define SF_TEST_HELP "\nsf test offset len " \
532 "- run a very basic destructive test"
538 sf, 5, 1, do_spi_flash,
539 "SPI flash sub-system",
540 "probe [[bus:]cs] [hz] [mode] - init flash device on given SPI bus\n"
542 "sf read addr offset len - read `len' bytes starting at\n"
543 " `offset' to memory at `addr'\n"
544 "sf write addr offset len - write `len' bytes from memory\n"
545 " at `addr' to flash at `offset'\n"
546 "sf erase offset [+]len - erase `len' bytes from `offset'\n"
547 " `+len' round up `len' to block size\n"
548 "sf update addr offset len - erase and write `len' bytes from memory\n"
549 " at `addr' to flash at `offset'"