| Patrick Delaunay | 109d13f | 2019-07-05 17:20:17 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause |
| 2 | /* |
| 3 | * Copyright (C) 2019, STMicroelectronics - All Rights Reserved |
| 4 | */ |
| 5 | |
| 6 | #include <common.h> |
| 7 | #include <command.h> |
| 8 | #include <console.h> |
| 9 | #include <misc.h> |
| 10 | #include <dm/device.h> |
| 11 | #include <dm/uclass.h> |
| 12 | |
| 13 | #define STM32_OTP_HASH_KEY_START 24 |
| 14 | #define STM32_OTP_HASH_KEY_SIZE 8 |
| 15 | |
| 16 | static void read_hash_value(u32 addr) |
| 17 | { |
| 18 | int i; |
| 19 | |
| 20 | for (i = 0; i < STM32_OTP_HASH_KEY_SIZE; i++) { |
| 21 | printf("OTP value %i: %x\n", STM32_OTP_HASH_KEY_START + i, |
| 22 | __be32_to_cpu(*(u32 *)addr)); |
| 23 | addr += 4; |
| 24 | } |
| 25 | } |
| 26 | |
| 27 | static void fuse_hash_value(u32 addr, bool print) |
| 28 | { |
| 29 | struct udevice *dev; |
| 30 | u32 word, val; |
| 31 | int i, ret; |
| 32 | |
| 33 | ret = uclass_get_device_by_driver(UCLASS_MISC, |
| 34 | DM_GET_DRIVER(stm32mp_bsec), |
| 35 | &dev); |
| 36 | if (ret) { |
| 37 | pr_err("Can't find stm32mp_bsec driver\n"); |
| 38 | return; |
| 39 | } |
| 40 | |
| 41 | for (i = 0; i < STM32_OTP_HASH_KEY_SIZE; i++) { |
| 42 | if (print) |
| 43 | printf("Fuse OTP %i : %x\n", |
| 44 | STM32_OTP_HASH_KEY_START + i, |
| 45 | __be32_to_cpu(*(u32 *)addr)); |
| 46 | |
| 47 | word = STM32_OTP_HASH_KEY_START + i; |
| 48 | val = __be32_to_cpu(*(u32 *)addr); |
| 49 | misc_write(dev, STM32_BSEC_OTP(word), &val, 4); |
| 50 | |
| 51 | addr += 4; |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | static int confirm_prog(void) |
| 56 | { |
| 57 | puts("Warning: Programming fuses is an irreversible operation!\n" |
| 58 | " This may brick your system.\n" |
| 59 | " Use this command only if you are sure of what you are doing!\n" |
| 60 | "\nReally perform this fuse programming? <y/N>\n"); |
| 61 | |
| 62 | if (confirm_yesno()) |
| 63 | return 1; |
| 64 | |
| 65 | puts("Fuse programming aborted\n"); |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | static int do_stm32key(cmd_tbl_t *cmdtp, int flag, int argc, |
| 70 | char * const argv[]) |
| 71 | { |
| 72 | u32 addr; |
| 73 | const char *op = argc >= 2 ? argv[1] : NULL; |
| 74 | int confirmed = argc > 3 && !strcmp(argv[2], "-y"); |
| 75 | |
| 76 | argc -= 2 + confirmed; |
| 77 | argv += 2 + confirmed; |
| 78 | |
| 79 | if (argc < 1) |
| 80 | return CMD_RET_USAGE; |
| 81 | |
| 82 | addr = simple_strtoul(argv[0], NULL, 16); |
| 83 | if (!addr) |
| 84 | return CMD_RET_USAGE; |
| 85 | |
| 86 | if (!strcmp(op, "read")) |
| 87 | read_hash_value(addr); |
| 88 | |
| 89 | if (!strcmp(op, "fuse")) { |
| 90 | if (!confirmed && !confirm_prog()) |
| 91 | return CMD_RET_FAILURE; |
| 92 | fuse_hash_value(addr, !confirmed); |
| 93 | } |
| 94 | |
| 95 | return CMD_RET_SUCCESS; |
| 96 | } |
| 97 | |
| 98 | U_BOOT_CMD(stm32key, 4, 1, do_stm32key, |
| 99 | "Fuse ST Hash key", |
| 100 | "read <addr>: Read the hash store at addr in memory\n" |
| 101 | "stm32key fuse [-y] <addr> : Fuse hash store at addr in otp\n"); |