2 * Command for accessing SPI flash.
4 * Copyright (C) 2008 Atmel Corporation
5 * Licensed under the GPL-2 or later.
10 #include <spi_flash.h>
14 #ifndef CONFIG_SF_DEFAULT_SPEED
15 # define CONFIG_SF_DEFAULT_SPEED 1000000
17 #ifndef CONFIG_SF_DEFAULT_MODE
18 # define CONFIG_SF_DEFAULT_MODE SPI_MODE_3
21 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);
64 static int do_spi_flash_probe(int argc, char * const argv[])
68 unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
69 unsigned int mode = CONFIG_SF_DEFAULT_MODE;
71 struct spi_flash *new;
76 cs = simple_strtoul(argv[1], &endp, 0);
77 if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
84 cs = simple_strtoul(endp + 1, &endp, 0);
90 speed = simple_strtoul(argv[2], &endp, 0);
91 if (*argv[2] == 0 || *endp != 0)
95 mode = simple_strtoul(argv[3], &endp, 16);
96 if (*argv[3] == 0 || *endp != 0)
100 new = spi_flash_probe(bus, cs, speed, mode);
102 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
107 spi_flash_free(flash);
114 * Write a block of data to SPI flash, first checking if it is different from
115 * what is already there.
117 * If the data being written is the same, then *skipped is incremented by len.
119 * @param flash flash context pointer
120 * @param offset flash offset to write
121 * @param len number of bytes to write
122 * @param buf buffer to write from
123 * @param cmp_buf read buffer to use to compare data
124 * @param skipped Count of skipped data (incremented by this function)
125 * @return NULL if OK, else a string containing the stage which failed
127 static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
128 size_t len, const char *buf, char *cmp_buf, size_t *skipped)
130 debug("offset=%#x, sector_size=%#x, len=%#x\n",
131 offset, flash->sector_size, len);
132 if (spi_flash_read(flash, offset, len, cmp_buf))
134 if (memcmp(cmp_buf, buf, len) == 0) {
135 debug("Skip region %x size %x: no change\n",
140 if (spi_flash_erase(flash, offset, len))
142 if (spi_flash_write(flash, offset, len, buf))
148 * Update an area of SPI flash by erasing and writing any blocks which need
149 * to change. Existing blocks with the correct data are left unchanged.
151 * @param flash flash context pointer
152 * @param offset flash offset to write
153 * @param len number of bytes to write
154 * @param buf buffer to write from
155 * @return 0 if ok, 1 on error
157 static int spi_flash_update(struct spi_flash *flash, u32 offset,
158 size_t len, const char *buf)
160 const char *err_oper = NULL;
162 const char *end = buf + len;
163 size_t todo; /* number of bytes to do in this pass */
164 size_t skipped; /* statistics */
166 cmp_buf = malloc(flash->sector_size);
168 for (skipped = 0; buf < end && !err_oper;
169 buf += todo, offset += todo) {
170 todo = min(end - buf, flash->sector_size);
171 err_oper = spi_flash_update_block(flash, offset, todo,
172 buf, cmp_buf, &skipped);
179 printf("SPI flash failed in %s step\n", err_oper);
182 printf("%zu bytes written, %zu bytes skipped\n", len - skipped,
187 static int do_spi_flash_read_write(int argc, char * const argv[])
190 unsigned long offset;
199 addr = simple_strtoul(argv[1], &endp, 16);
200 if (*argv[1] == 0 || *endp != 0)
202 offset = simple_strtoul(argv[2], &endp, 16);
203 if (*argv[2] == 0 || *endp != 0)
205 len = simple_strtoul(argv[3], &endp, 16);
206 if (*argv[3] == 0 || *endp != 0)
209 buf = map_physmem(addr, len, MAP_WRBACK);
211 puts("Failed to map physical memory\n");
215 if (strcmp(argv[0], "update") == 0)
216 ret = spi_flash_update(flash, offset, len, buf);
217 else if (strcmp(argv[0], "read") == 0)
218 ret = spi_flash_read(flash, offset, len, buf);
220 ret = spi_flash_write(flash, offset, len, buf);
222 unmap_physmem(buf, len);
225 printf("SPI flash %s failed\n", argv[0]);
232 static int do_spi_flash_erase(int argc, char * const argv[])
234 unsigned long offset;
242 offset = simple_strtoul(argv[1], &endp, 16);
243 if (*argv[1] == 0 || *endp != 0)
246 ret = sf_parse_len_arg(argv[2], &len);
250 ret = spi_flash_erase(flash, offset, len);
252 printf("SPI flash %s failed\n", argv[0]);
259 static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
264 /* need at least two arguments */
272 if (strcmp(cmd, "probe") == 0) {
273 ret = do_spi_flash_probe(argc, argv);
277 /* The remaining commands require a selected device */
279 puts("No SPI flash selected. Please run `sf probe'\n");
283 if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
284 strcmp(cmd, "update") == 0)
285 ret = do_spi_flash_read_write(argc, argv);
286 else if (strcmp(cmd, "erase") == 0)
287 ret = do_spi_flash_erase(argc, argv);
296 return cmd_usage(cmdtp);
300 sf, 5, 1, do_spi_flash,
301 "SPI flash sub-system",
302 "probe [bus:]cs [hz] [mode] - init flash device on given SPI bus\n"
304 "sf read addr offset len - read `len' bytes starting at\n"
305 " `offset' to memory at `addr'\n"
306 "sf write addr offset len - write `len' bytes from memory\n"
307 " at `addr' to flash at `offset'\n"
308 "sf erase offset [+]len - erase `len' bytes from `offset'\n"
309 " `+len' round up `len' to block size\n"
310 "sf update addr offset len - erase and write `len' bytes from memory\n"
311 " at `addr' to flash at `offset'"