X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=common%2Fcmd_sf.c;h=72256567d32089a154b7c58edb3fda9e61acd486;hb=d510859bed4165ebf2635c74c40a037cd2819fce;hp=6a60b16805b261013bd21722d1821cb92d174524;hpb=6c6e042ab3bbfb5428e4cdeb38fa27728c63afdd;p=oweals%2Fu-boot.git diff --git a/common/cmd_sf.c b/common/cmd_sf.c index 6a60b16805..72256567d3 100644 --- a/common/cmd_sf.c +++ b/common/cmd_sf.c @@ -2,8 +2,11 @@ * Command for accessing SPI flash. * * Copyright (C) 2008 Atmel Corporation + * Licensed under the GPL-2 or later. */ + #include +#include #include #include @@ -17,7 +20,48 @@ static struct spi_flash *flash; -static int do_spi_flash_probe(int argc, char *argv[]) + +/* + * This function computes the length argument for the erase command. + * The length on which the command is to operate can be given in two forms: + * 1. offset len - operate on <'offset', 'len') + * 2. offset +len - operate on <'offset', 'round_up(len)') + * If the second form is used and the length doesn't fall on the + * sector boundary, than it will be adjusted to the next sector boundary. + * If it isn't in the flash, the function will fail (return -1). + * Input: + * arg: length specification (i.e. both command arguments) + * Output: + * len: computed length for operation + * Return: + * 1: success + * -1: failure (bad format, bad address). + */ +static int sf_parse_len_arg(char *arg, ulong *len) +{ + char *ep; + char round_up_len; /* indicates if the "+length" form used */ + ulong len_arg; + + round_up_len = 0; + if (*arg == '+') { + round_up_len = 1; + ++arg; + } + + len_arg = simple_strtoul(arg, &ep, 16); + if (ep == arg || *ep != '\0') + return -1; + + if (round_up_len && flash->sector_size > 0) + *len = ROUND(len_arg, flash->sector_size); + else + *len = len_arg; + + return 1; +} + +static int do_spi_flash_probe(int argc, char * const argv[]) { unsigned int bus = 0; unsigned int cs; @@ -27,30 +71,30 @@ static int do_spi_flash_probe(int argc, char *argv[]) struct spi_flash *new; if (argc < 2) - goto usage; + return -1; cs = simple_strtoul(argv[1], &endp, 0); if (*argv[1] == 0 || (*endp != 0 && *endp != ':')) - goto usage; + return -1; if (*endp == ':') { if (endp[1] == 0) - goto usage; + return -1; bus = cs; cs = simple_strtoul(endp + 1, &endp, 0); if (*endp != 0) - goto usage; + return -1; } if (argc >= 3) { speed = simple_strtoul(argv[2], &endp, 0); if (*argv[2] == 0 || *endp != 0) - goto usage; + return -1; } if (argc >= 4) { - mode = simple_strtoul(argv[3], &endp, 0); + mode = simple_strtoul(argv[3], &endp, 16); if (*argv[3] == 0 || *endp != 0) - goto usage; + return -1; } new = spi_flash_probe(bus, cs, speed, mode); @@ -63,17 +107,84 @@ static int do_spi_flash_probe(int argc, char *argv[]) spi_flash_free(flash); flash = new; - printf("%u KiB %s at %u:%u is now current device\n", - flash->size >> 10, flash->name, bus, cs); - return 0; +} -usage: - puts("Usage: sf probe [bus:]cs [hz] [mode]\n"); - return 1; +/** + * Write a block of data to SPI flash, first checking if it is different from + * what is already there. + * + * If the data being written is the same, then *skipped is incremented by len. + * + * @param flash flash context pointer + * @param offset flash offset to write + * @param len number of bytes to write + * @param buf buffer to write from + * @param cmp_buf read buffer to use to compare data + * @param skipped Count of skipped data (incremented by this function) + * @return NULL if OK, else a string containing the stage which failed + */ +static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset, + size_t len, const char *buf, char *cmp_buf, size_t *skipped) +{ + debug("offset=%#x, sector_size=%#x, len=%#x\n", + offset, flash->sector_size, len); + if (spi_flash_read(flash, offset, len, cmp_buf)) + return "read"; + if (memcmp(cmp_buf, buf, len) == 0) { + debug("Skip region %x size %x: no change\n", + offset, len); + *skipped += len; + return NULL; + } + if (spi_flash_erase(flash, offset, len)) + return "erase"; + if (spi_flash_write(flash, offset, len, buf)) + return "write"; + return NULL; +} + +/** + * Update an area of SPI flash by erasing and writing any blocks which need + * to change. Existing blocks with the correct data are left unchanged. + * + * @param flash flash context pointer + * @param offset flash offset to write + * @param len number of bytes to write + * @param buf buffer to write from + * @return 0 if ok, 1 on error + */ +static int spi_flash_update(struct spi_flash *flash, u32 offset, + size_t len, const char *buf) +{ + const char *err_oper = NULL; + char *cmp_buf; + const char *end = buf + len; + size_t todo; /* number of bytes to do in this pass */ + size_t skipped = 0; /* statistics */ + + cmp_buf = malloc(flash->sector_size); + if (cmp_buf) { + for (; buf < end && !err_oper; buf += todo, offset += todo) { + todo = min(end - buf, flash->sector_size); + err_oper = spi_flash_update_block(flash, offset, todo, + buf, cmp_buf, &skipped); + } + } else { + err_oper = "malloc"; + } + free(cmp_buf); + if (err_oper) { + printf("SPI flash failed in %s step\n", err_oper); + return 1; + } + printf("%zu bytes written, %zu bytes skipped\n", len - skipped, + skipped); + + return 0; } -static int do_spi_flash_read_write(int argc, char *argv[]) +static int do_spi_flash_read_write(int argc, char * const argv[]) { unsigned long addr; unsigned long offset; @@ -83,17 +194,17 @@ static int do_spi_flash_read_write(int argc, char *argv[]) int ret; if (argc < 4) - goto usage; + return -1; addr = simple_strtoul(argv[1], &endp, 16); if (*argv[1] == 0 || *endp != 0) - goto usage; + return -1; offset = simple_strtoul(argv[2], &endp, 16); if (*argv[2] == 0 || *endp != 0) - goto usage; + return -1; len = simple_strtoul(argv[3], &endp, 16); if (*argv[3] == 0 || *endp != 0) - goto usage; + return -1; buf = map_physmem(addr, len, MAP_WRBACK); if (!buf) { @@ -101,7 +212,9 @@ static int do_spi_flash_read_write(int argc, char *argv[]) return 1; } - if (strcmp(argv[0], "read") == 0) + if (strcmp(argv[0], "update") == 0) + ret = spi_flash_update(flash, offset, len, buf); + else if (strcmp(argv[0], "read") == 0) ret = spi_flash_read(flash, offset, len, buf); else ret = spi_flash_write(flash, offset, len, buf); @@ -114,13 +227,9 @@ static int do_spi_flash_read_write(int argc, char *argv[]) } return 0; - -usage: - printf("Usage: sf %s addr offset len\n", argv[0]); - return 1; } -static int do_spi_flash_erase(int argc, char *argv[]) +static int do_spi_flash_erase(int argc, char * const argv[]) { unsigned long offset; unsigned long len; @@ -128,14 +237,15 @@ static int do_spi_flash_erase(int argc, char *argv[]) int ret; if (argc < 3) - goto usage; + return -1; offset = simple_strtoul(argv[1], &endp, 16); if (*argv[1] == 0 || *endp != 0) - goto usage; - len = simple_strtoul(argv[2], &endp, 16); - if (*argv[2] == 0 || *endp != 0) - goto usage; + return -1; + + ret = sf_parse_len_arg(argv[2], &len); + if (ret != 1) + return -1; ret = spi_flash_erase(flash, offset, len); if (ret) { @@ -144,24 +254,25 @@ static int do_spi_flash_erase(int argc, char *argv[]) } return 0; - -usage: - puts("Usage: sf erase offset len\n"); - return 1; } -static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { const char *cmd; + int ret; /* need at least two arguments */ if (argc < 2) goto usage; cmd = argv[1]; + --argc; + ++argv; - if (strcmp(cmd, "probe") == 0) - return do_spi_flash_probe(argc - 1, argv + 1); + if (strcmp(cmd, "probe") == 0) { + ret = do_spi_flash_probe(argc, argv); + goto done; + } /* The remaining commands require a selected device */ if (!flash) { @@ -169,14 +280,20 @@ static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) return 1; } - if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0) - return do_spi_flash_read_write(argc - 1, argv + 1); - if (strcmp(cmd, "erase") == 0) - return do_spi_flash_erase(argc - 1, argv + 1); + if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 || + strcmp(cmd, "update") == 0) + ret = do_spi_flash_read_write(argc, argv); + else if (strcmp(cmd, "erase") == 0) + ret = do_spi_flash_erase(argc, argv); + else + ret = -1; + +done: + if (ret != -1) + return ret; usage: - cmd_usage(cmdtp); - return 1; + return cmd_usage(cmdtp); } U_BOOT_CMD( @@ -188,4 +305,8 @@ U_BOOT_CMD( " `offset' to memory at `addr'\n" "sf write addr offset len - write `len' bytes from memory\n" " at `addr' to flash at `offset'\n" - "sf erase offset len - erase `len' bytes from `offset'\n"); + "sf erase offset [+]len - erase `len' bytes from `offset'\n" + " `+len' round up `len' to block size\n" + "sf update addr offset len - erase and write `len' bytes from memory\n" + " at `addr' to flash at `offset'" +);