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![Kumar Gala](/assets/img/avatar_default.png)
cmd_sf.c: In function 'do_spi_flash': cmd_sf.c:164:9: warning: 'skipped' may be used uninitialized in this function Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Acked-by: Mike Frysinger <vapier@gentoo.org> Acked-by: Simon Glass <sjg@chromium.org>
313 lines
7.3 KiB
C
313 lines
7.3 KiB
C
/*
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* Command for accessing SPI flash.
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*
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* Copyright (C) 2008 Atmel Corporation
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <malloc.h>
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#include <spi_flash.h>
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#include <asm/io.h>
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#ifndef CONFIG_SF_DEFAULT_SPEED
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# define CONFIG_SF_DEFAULT_SPEED 1000000
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#endif
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#ifndef CONFIG_SF_DEFAULT_MODE
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# define CONFIG_SF_DEFAULT_MODE SPI_MODE_3
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#endif
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static struct spi_flash *flash;
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/*
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* This function computes the length argument for the erase command.
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* The length on which the command is to operate can be given in two forms:
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* 1. <cmd> offset len - operate on <'offset', 'len')
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* 2. <cmd> offset +len - operate on <'offset', 'round_up(len)')
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* If the second form is used and the length doesn't fall on the
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* sector boundary, than it will be adjusted to the next sector boundary.
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* If it isn't in the flash, the function will fail (return -1).
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* Input:
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* arg: length specification (i.e. both command arguments)
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* Output:
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* len: computed length for operation
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* Return:
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* 1: success
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* -1: failure (bad format, bad address).
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*/
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static int sf_parse_len_arg(char *arg, ulong *len)
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{
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char *ep;
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char round_up_len; /* indicates if the "+length" form used */
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ulong len_arg;
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round_up_len = 0;
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if (*arg == '+') {
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round_up_len = 1;
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++arg;
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}
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len_arg = simple_strtoul(arg, &ep, 16);
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if (ep == arg || *ep != '\0')
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return -1;
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if (round_up_len && flash->sector_size > 0)
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*len = ROUND(len_arg, flash->sector_size);
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else
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*len = len_arg;
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return 1;
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}
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static int do_spi_flash_probe(int argc, char * const argv[])
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{
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unsigned int bus = 0;
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unsigned int cs;
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unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
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unsigned int mode = CONFIG_SF_DEFAULT_MODE;
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char *endp;
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struct spi_flash *new;
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if (argc < 2)
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return -1;
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cs = simple_strtoul(argv[1], &endp, 0);
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if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
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return -1;
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if (*endp == ':') {
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if (endp[1] == 0)
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return -1;
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bus = cs;
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cs = simple_strtoul(endp + 1, &endp, 0);
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if (*endp != 0)
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return -1;
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}
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if (argc >= 3) {
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speed = simple_strtoul(argv[2], &endp, 0);
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if (*argv[2] == 0 || *endp != 0)
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return -1;
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}
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if (argc >= 4) {
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mode = simple_strtoul(argv[3], &endp, 16);
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if (*argv[3] == 0 || *endp != 0)
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return -1;
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}
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new = spi_flash_probe(bus, cs, speed, mode);
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if (!new) {
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printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
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return 1;
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}
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if (flash)
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spi_flash_free(flash);
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flash = new;
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return 0;
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}
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/**
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* Write a block of data to SPI flash, first checking if it is different from
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* what is already there.
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*
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* If the data being written is the same, then *skipped is incremented by len.
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*
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* @param flash flash context pointer
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* @param offset flash offset to write
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* @param len number of bytes to write
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* @param buf buffer to write from
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* @param cmp_buf read buffer to use to compare data
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* @param skipped Count of skipped data (incremented by this function)
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* @return NULL if OK, else a string containing the stage which failed
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*/
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static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
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size_t len, const char *buf, char *cmp_buf, size_t *skipped)
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{
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debug("offset=%#x, sector_size=%#x, len=%#x\n",
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offset, flash->sector_size, len);
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if (spi_flash_read(flash, offset, len, cmp_buf))
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return "read";
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if (memcmp(cmp_buf, buf, len) == 0) {
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debug("Skip region %x size %x: no change\n",
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offset, len);
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*skipped += len;
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return NULL;
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}
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if (spi_flash_erase(flash, offset, len))
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return "erase";
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if (spi_flash_write(flash, offset, len, buf))
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return "write";
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return NULL;
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}
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/**
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* Update an area of SPI flash by erasing and writing any blocks which need
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* to change. Existing blocks with the correct data are left unchanged.
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*
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* @param flash flash context pointer
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* @param offset flash offset to write
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* @param len number of bytes to write
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* @param buf buffer to write from
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* @return 0 if ok, 1 on error
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*/
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static int spi_flash_update(struct spi_flash *flash, u32 offset,
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size_t len, const char *buf)
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{
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const char *err_oper = NULL;
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char *cmp_buf;
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const char *end = buf + len;
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size_t todo; /* number of bytes to do in this pass */
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size_t skipped = 0; /* statistics */
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cmp_buf = malloc(flash->sector_size);
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if (cmp_buf) {
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for (; buf < end && !err_oper; buf += todo, offset += todo) {
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todo = min(end - buf, flash->sector_size);
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err_oper = spi_flash_update_block(flash, offset, todo,
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buf, cmp_buf, &skipped);
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}
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} else {
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err_oper = "malloc";
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}
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free(cmp_buf);
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if (err_oper) {
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printf("SPI flash failed in %s step\n", err_oper);
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return 1;
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}
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printf("%zu bytes written, %zu bytes skipped\n", len - skipped,
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skipped);
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return 0;
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}
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static int do_spi_flash_read_write(int argc, char * const argv[])
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{
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unsigned long addr;
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unsigned long offset;
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unsigned long len;
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void *buf;
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char *endp;
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int ret;
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if (argc < 4)
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return -1;
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addr = simple_strtoul(argv[1], &endp, 16);
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if (*argv[1] == 0 || *endp != 0)
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return -1;
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offset = simple_strtoul(argv[2], &endp, 16);
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if (*argv[2] == 0 || *endp != 0)
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return -1;
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len = simple_strtoul(argv[3], &endp, 16);
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if (*argv[3] == 0 || *endp != 0)
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return -1;
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buf = map_physmem(addr, len, MAP_WRBACK);
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if (!buf) {
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puts("Failed to map physical memory\n");
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return 1;
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}
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if (strcmp(argv[0], "update") == 0)
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ret = spi_flash_update(flash, offset, len, buf);
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else if (strcmp(argv[0], "read") == 0)
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ret = spi_flash_read(flash, offset, len, buf);
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else
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ret = spi_flash_write(flash, offset, len, buf);
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unmap_physmem(buf, len);
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if (ret) {
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printf("SPI flash %s failed\n", argv[0]);
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return 1;
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}
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return 0;
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}
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static int do_spi_flash_erase(int argc, char * const argv[])
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{
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unsigned long offset;
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unsigned long len;
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char *endp;
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int ret;
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if (argc < 3)
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return -1;
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offset = simple_strtoul(argv[1], &endp, 16);
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if (*argv[1] == 0 || *endp != 0)
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return -1;
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ret = sf_parse_len_arg(argv[2], &len);
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if (ret != 1)
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return -1;
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ret = spi_flash_erase(flash, offset, len);
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if (ret) {
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printf("SPI flash %s failed\n", argv[0]);
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return 1;
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}
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return 0;
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}
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static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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const char *cmd;
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int ret;
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/* need at least two arguments */
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if (argc < 2)
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goto usage;
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cmd = argv[1];
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--argc;
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++argv;
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if (strcmp(cmd, "probe") == 0) {
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ret = do_spi_flash_probe(argc, argv);
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goto done;
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}
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/* The remaining commands require a selected device */
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if (!flash) {
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puts("No SPI flash selected. Please run `sf probe'\n");
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return 1;
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}
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if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
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strcmp(cmd, "update") == 0)
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ret = do_spi_flash_read_write(argc, argv);
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else if (strcmp(cmd, "erase") == 0)
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ret = do_spi_flash_erase(argc, argv);
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else
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ret = -1;
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done:
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if (ret != -1)
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return ret;
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usage:
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return cmd_usage(cmdtp);
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}
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U_BOOT_CMD(
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sf, 5, 1, do_spi_flash,
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"SPI flash sub-system",
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"probe [bus:]cs [hz] [mode] - init flash device on given SPI bus\n"
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" and chip select\n"
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"sf read addr offset len - read `len' bytes starting at\n"
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" `offset' to memory at `addr'\n"
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"sf write addr offset len - write `len' bytes from memory\n"
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" at `addr' to flash at `offset'\n"
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"sf erase offset [+]len - erase `len' bytes from `offset'\n"
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" `+len' round up `len' to block size\n"
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"sf update addr offset len - erase and write `len' bytes from memory\n"
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" at `addr' to flash at `offset'"
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);
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