cmd_fuse.c
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/*
* (C) Copyright 2009-2013 ADVANSEE
* Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
*
* Based on the mpc512x iim code:
* Copyright 2008 Silicon Turnkey Express, Inc.
* Martha Marx <mmarx@silicontkx.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <fuse.h>
#include <asm/errno.h>
static int strtou32(const char *str, unsigned int base, u32 *result)
{
char *ep;
*result = simple_strtoul(str, &ep, base);
if (ep == str || *ep != '\0')
return -EINVAL;
return 0;
}
static int confirm_prog(void)
{
puts("Warning: Programming fuses is an irreversible operation!\n"
" This may brick your system.\n"
" Use this command only if you are sure of "
"what you are doing!\n"
"\nReally perform this fuse programming? <y/N>\n");
if (confirm_yesno())
return 1;
puts("Fuse programming aborted\n");
return 0;
}
static int do_fuse(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
const char *op = argc >= 2 ? argv[1] : NULL;
int confirmed = argc >= 3 && !strcmp(argv[2], "-y");
u32 bank, word, cnt, val;
int ret, i;
argc -= 2 + confirmed;
argv += 2 + confirmed;
if (argc < 2 || strtou32(argv[0], 0, &bank) ||
strtou32(argv[1], 0, &word))
return CMD_RET_USAGE;
if (!strcmp(op, "read")) {
if (argc == 2)
cnt = 1;
else if (argc != 3 || strtou32(argv[2], 0, &cnt))
return CMD_RET_USAGE;
printf("Reading bank %u:\n", bank);
for (i = 0; i < cnt; i++, word++) {
if (!(i % 4))
printf("\nWord 0x%.8x:", word);
ret = fuse_read(bank, word, &val);
if (ret)
goto err;
printf(" %.8x", val);
}
putc('\n');
} else if (!strcmp(op, "sense")) {
if (argc == 2)
cnt = 1;
else if (argc != 3 || strtou32(argv[2], 0, &cnt))
return CMD_RET_USAGE;
printf("Sensing bank %u:\n", bank);
for (i = 0; i < cnt; i++, word++) {
if (!(i % 4))
printf("\nWord 0x%.8x:", word);
ret = fuse_sense(bank, word, &val);
if (ret)
goto err;
printf(" %.8x", val);
}
putc('\n');
} else if (!strcmp(op, "prog")) {
if (argc < 3)
return CMD_RET_USAGE;
for (i = 2; i < argc; i++, word++) {
if (strtou32(argv[i], 16, &val))
return CMD_RET_USAGE;
printf("Programming bank %u word 0x%.8x to 0x%.8x...\n",
bank, word, val);
if (!confirmed && !confirm_prog())
return CMD_RET_FAILURE;
ret = fuse_prog(bank, word, val);
if (ret)
goto err;
}
} else if (!strcmp(op, "override")) {
if (argc < 3)
return CMD_RET_USAGE;
for (i = 2; i < argc; i++, word++) {
if (strtou32(argv[i], 16, &val))
return CMD_RET_USAGE;
printf("Overriding bank %u word 0x%.8x with "
"0x%.8x...\n", bank, word, val);
ret = fuse_override(bank, word, val);
if (ret)
goto err;
}
} else {
return CMD_RET_USAGE;
}
return 0;
err:
puts("ERROR\n");
return CMD_RET_FAILURE;
}
U_BOOT_CMD(
fuse, CONFIG_SYS_MAXARGS, 0, do_fuse,
"Fuse sub-system",
"read <bank> <word> [<cnt>] - read 1 or 'cnt' fuse words,\n"
" starting at 'word'\n"
"fuse sense <bank> <word> [<cnt>] - sense 1 or 'cnt' fuse words,\n"
" starting at 'word'\n"
"fuse prog [-y] <bank> <word> <hexval> [<hexval>...] - program 1 or\n"
" several fuse words, starting at 'word' (PERMANENT)\n"
"fuse override <bank> <word> <hexval> [<hexval>...] - override 1 or\n"
" several fuse words, starting at 'word'"
);