diff options
Diffstat (limited to 'common/cmd_imxotp.c')
| -rw-r--r-- | common/cmd_imxotp.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/common/cmd_imxotp.c b/common/cmd_imxotp.c new file mode 100644 index 0000000000..3d5b98a61f --- /dev/null +++ b/common/cmd_imxotp.c @@ -0,0 +1,159 @@ +/* + * Copyright (C) 2011 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 <asm/arch/sys_proto.h> + +/* meant to reject most of the zeros return by simple_strtoul call */ +int validate_zero_from_simple_strtoul(char *str) +{ + int i; + + /* 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 * const argv[]) +{ + u32 addr, value_read; +#ifdef IMX_OTPWRITE_ENABLED + u32 fused_value, value_to_fuse; + int force_to_fuse = 0; +#endif + + 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 has the value: 0x%08X\n", addr, value_read); +#ifdef IMX_OTPWRITE_ENABLED + } 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 has the value: 0x%08X\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%08X\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%08X\n", + addr, value_to_fuse); + } else { + printf("Operation %s fuse" + " at index 0x%X value: 0x%08X\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); + } +#endif + } else + goto usage; + + return 0; +} + +U_BOOT_CMD(imxotp, 5, 0, do_imxotp, + "One-Time Programable sub-system for i.MX processors", + "read <addr>\n" + " - read fuse at 'addr'\n" +#ifdef IMX_OTPWRITE_ENABLED + "imxotp blow [--force] <addr> <value>\n" + " - blow fuse at 'addr' with hex value 'value'\n" +#endif +); |