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
20 #ifndef CONFIG_SF_DEFAULT_CS
21 # define CONFIG_SF_DEFAULT_CS 0
23 #ifndef CONFIG_SF_DEFAULT_BUS
24 # define CONFIG_SF_DEFAULT_BUS 0
27 static struct spi_flash *flash;
31 * This function computes the length argument for the erase command.
32 * The length on which the command is to operate can be given in two forms:
33 * 1. <cmd> offset len - operate on <'offset', 'len')
34 * 2. <cmd> offset +len - operate on <'offset', 'round_up(len)')
35 * If the second form is used and the length doesn't fall on the
36 * sector boundary, than it will be adjusted to the next sector boundary.
37 * If it isn't in the flash, the function will fail (return -1).
39 * arg: length specification (i.e. both command arguments)
41 * len: computed length for operation
44 * -1: failure (bad format, bad address).
46 static int sf_parse_len_arg(char *arg, ulong *len)
49 char round_up_len; /* indicates if the "+length" form used */
58 len_arg = simple_strtoul(arg, &ep, 16);
59 if (ep == arg || *ep != '\0')
62 if (round_up_len && flash->sector_size > 0)
63 *len = ROUND(len_arg, flash->sector_size);
70 static int do_spi_flash_probe(int argc, char * const argv[])
72 unsigned int bus = CONFIG_SF_DEFAULT_BUS;
73 unsigned int cs = CONFIG_SF_DEFAULT_CS;
74 unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
75 unsigned int mode = CONFIG_SF_DEFAULT_MODE;
77 struct spi_flash *new;
80 cs = simple_strtoul(argv[1], &endp, 0);
81 if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
88 cs = simple_strtoul(endp + 1, &endp, 0);
95 speed = simple_strtoul(argv[2], &endp, 0);
96 if (*argv[2] == 0 || *endp != 0)
100 mode = simple_strtoul(argv[3], &endp, 16);
101 if (*argv[3] == 0 || *endp != 0)
105 new = spi_flash_probe(bus, cs, speed, mode);
107 printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
112 spi_flash_free(flash);
119 * Write a block of data to SPI flash, first checking if it is different from
120 * what is already there.
122 * If the data being written is the same, then *skipped is incremented by len.
124 * @param flash flash context pointer
125 * @param offset flash offset to write
126 * @param len number of bytes to write
127 * @param buf buffer to write from
128 * @param cmp_buf read buffer to use to compare data
129 * @param skipped Count of skipped data (incremented by this function)
130 * @return NULL if OK, else a string containing the stage which failed
132 static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
133 size_t len, const char *buf, char *cmp_buf, size_t *skipped)
135 debug("offset=%#x, sector_size=%#x, len=%#zx\n",
136 offset, flash->sector_size, len);
137 if (spi_flash_read(flash, offset, len, cmp_buf))
139 if (memcmp(cmp_buf, buf, len) == 0) {
140 debug("Skip region %x size %zx: no change\n",
145 if (spi_flash_erase(flash, offset, len))
147 if (spi_flash_write(flash, offset, len, buf))
153 * Update an area of SPI flash by erasing and writing any blocks which need
154 * to change. Existing blocks with the correct data are left unchanged.
156 * @param flash flash context pointer
157 * @param offset flash offset to write
158 * @param len number of bytes to write
159 * @param buf buffer to write from
160 * @return 0 if ok, 1 on error
162 static int spi_flash_update(struct spi_flash *flash, u32 offset,
163 size_t len, const char *buf)
165 const char *err_oper = NULL;
167 const char *end = buf + len;
168 size_t todo; /* number of bytes to do in this pass */
169 size_t skipped = 0; /* statistics */
171 cmp_buf = malloc(flash->sector_size);
173 for (; buf < end && !err_oper; buf += todo, offset += todo) {
174 todo = min(end - buf, flash->sector_size);
175 err_oper = spi_flash_update_block(flash, offset, todo,
176 buf, cmp_buf, &skipped);
183 printf("SPI flash failed in %s step\n", err_oper);
186 printf("%zu bytes written, %zu bytes skipped\n", len - skipped,
192 static int do_spi_flash_read_write(int argc, char * const argv[])
195 unsigned long offset;
204 addr = simple_strtoul(argv[1], &endp, 16);
205 if (*argv[1] == 0 || *endp != 0)
207 offset = simple_strtoul(argv[2], &endp, 16);
208 if (*argv[2] == 0 || *endp != 0)
210 len = simple_strtoul(argv[3], &endp, 16);
211 if (*argv[3] == 0 || *endp != 0)
214 /* Consistency checking */
215 if (offset + len > flash->size) {
216 printf("ERROR: attempting %s past flash size (%#x)\n",
217 argv[0], flash->size);
221 buf = map_physmem(addr, len, MAP_WRBACK);
223 puts("Failed to map physical memory\n");
227 if (strcmp(argv[0], "update") == 0)
228 ret = spi_flash_update(flash, offset, len, buf);
229 else if (strcmp(argv[0], "read") == 0)
230 ret = spi_flash_read(flash, offset, len, buf);
232 ret = spi_flash_write(flash, offset, len, buf);
234 unmap_physmem(buf, len);
237 printf("SPI flash %s failed\n", argv[0]);
244 static int do_spi_flash_erase(int argc, char * const argv[])
246 unsigned long offset;
254 offset = simple_strtoul(argv[1], &endp, 16);
255 if (*argv[1] == 0 || *endp != 0)
258 ret = sf_parse_len_arg(argv[2], &len);
262 /* Consistency checking */
263 if (offset + len > flash->size) {
264 printf("ERROR: attempting %s past flash size (%#x)\n",
265 argv[0], flash->size);
269 ret = spi_flash_erase(flash, offset, len);
271 printf("SPI flash %s failed\n", argv[0]);
278 static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
283 /* need at least two arguments */
291 if (strcmp(cmd, "probe") == 0) {
292 ret = do_spi_flash_probe(argc, argv);
296 /* The remaining commands require a selected device */
298 puts("No SPI flash selected. Please run `sf probe'\n");
302 if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
303 strcmp(cmd, "update") == 0)
304 ret = do_spi_flash_read_write(argc, argv);
305 else if (strcmp(cmd, "erase") == 0)
306 ret = do_spi_flash_erase(argc, argv);
315 return CMD_RET_USAGE;
319 sf, 5, 1, do_spi_flash,
320 "SPI flash sub-system",
321 "probe [[bus:]cs] [hz] [mode] - init flash device on given SPI bus\n"
323 "sf read addr offset len - read `len' bytes starting at\n"
324 " `offset' to memory at `addr'\n"
325 "sf write addr offset len - write `len' bytes from memory\n"
326 " at `addr' to flash at `offset'\n"
327 "sf erase offset [+]len - erase `len' bytes from `offset'\n"
328 " `+len' round up `len' to block size\n"
329 "sf update addr offset len - erase and write `len' bytes from memory\n"
330 " at `addr' to flash at `offset'"