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/*
* Copyright (C) 2011-2012 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <config.h>
#include <common.h>
#include <command.h>
#include <imx_otp.h>
/*
* meant to reject most of the zeros return by simple_strtoul call.
*
*/
int validate_zero_from_simple_strtoul(char *str)
{
int i = 0;
/* reject negatives */
if (str[0] == '-')
return -1;
/* reject no zero initialed */
if (str[0] != '0')
return -1;
/* accept zero */
if (strlen(str) == 1)
return 0;
/* only accept started with "0x" or "0X" or "00" */
if (str[1] != 'x' && str[1] != 'X' && str[1] != '0')
return -1;
/* reject "0x" or "0X" or "00" only */
if (strlen(str) == 3)
return -1;
/* only accept all zeros */
for (i = 1; i < strlen(str) - 1; i++) {
if (str[1] != '0')
return -1;
}
return 0;
}
int do_imxotp(cmd_tbl_t *cmd_tbl, int flag, int argc, char* argv[])
{
u32 addr, value_read, fused_value, value_to_fuse;
int force_to_fuse = 0;
if (argc < 3) {
usage:
cmd_usage(cmd_tbl);
return 1;
}
if (!strcmp(argv[1], "read")) {
switch (argc) {
case 3:
addr = simple_strtoul(argv[2], NULL, 16);
if ((addr == 0) &&
validate_zero_from_simple_strtoul(argv[2]))
goto usage;
break;
default:
goto usage;
}
printf("Reading fuse at index: 0x%X\n", addr);
if (imx_otp_read_one_u32(addr, &value_read))
return -1;
printf("Fuse at (index: 0x%X) value: 0x%X\n", addr, value_read);
} else if (!strcmp(argv[1], "blow")) {
if (argc < 4 || argc > 5)
goto usage;
if (!strcmp(argv[2], "--force")) {
force_to_fuse = 1;
addr = simple_strtoul(argv[3], NULL, 16);
if ((addr == 0)
&& validate_zero_from_simple_strtoul(argv[3]))
goto usage;
value_to_fuse = simple_strtoul(argv[4], NULL, 16);
if ((value_to_fuse == 0)
&& validate_zero_from_simple_strtoul(argv[4]))
goto usage;
} else {
addr = simple_strtoul(argv[2], NULL, 16);
if ((addr == 0)
&& validate_zero_from_simple_strtoul(argv[2]))
goto usage;
value_to_fuse = simple_strtoul(argv[3], NULL, 16);
if ((value_to_fuse == 0)
&& validate_zero_from_simple_strtoul(argv[3]))
goto usage;
}
/* show the current value of specified address (fuse index) */
if (imx_otp_read_one_u32(addr, &value_read))
return -1;
printf("Current fuse at (index: 0x%X) value: 0x%X\n",
addr, value_read);
if ((value_to_fuse & value_read) == value_to_fuse)
printf("!! Fuse blow skipped:"
" the bits have been already set.\n");
else if (force_to_fuse) {
printf("Blowing fuse at index: 0x%X, value: 0x%X\n",
addr, value_to_fuse);
if (imx_otp_blow_one_u32(addr,
value_to_fuse, &fused_value)) {
printf("ERROR: failed to blow fuse"
" at 0x%X with value of 0x%X\n",
addr, value_to_fuse);
} else {
printf("Operation %s fuse"
" at (index: 0x%X) value: 0x%X\n",
((fused_value & value_to_fuse) ==
value_to_fuse) ? "succeeded"
: "failed",
addr, fused_value);
}
} else {
printf("!! Fuse blow aborted."
" if you do want to blow it."
" Please use the command:\n"
"%s blow --force %X %X\n",
argv[0], addr, value_to_fuse);
}
} else
goto usage;
return 0;
}
U_BOOT_CMD(imxotp, 5, 0, do_imxotp,
"One-Time Programable sub-system",
"imxotp read <index>\n"
" - read fuse at 'index'\n"
"imxotp blow [--force] <index> <value>\n"
" - blow fuse at 'index' with hex value 'value'\n"
"Tips:\n"
"'addr' to 'index':\n"
"convert 'index' from 'address'\n"
"index = (addr - otp_base) / 0x10\n"
"eg, addr is 0x021bc410, otp_base is 0x021bc400, the index = 1\n"
);
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