103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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/*
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* Copyright (C) 2019, STMicroelectronics - All Rights Reserved
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*/
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#include <common.h>
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#include <command.h>
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#include <console.h>
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#include <log.h>
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#include <misc.h>
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#include <dm/device.h>
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#include <dm/uclass.h>
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#define STM32_OTP_HASH_KEY_START 24
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#define STM32_OTP_HASH_KEY_SIZE 8
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static void read_hash_value(u32 addr)
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{
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int i;
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for (i = 0; i < STM32_OTP_HASH_KEY_SIZE; i++) {
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printf("OTP value %i: %x\n", STM32_OTP_HASH_KEY_START + i,
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__be32_to_cpu(*(u32 *)addr));
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addr += 4;
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}
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}
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static void fuse_hash_value(u32 addr, bool print)
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{
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struct udevice *dev;
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u32 word, val;
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int i, ret;
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ret = uclass_get_device_by_driver(UCLASS_MISC,
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DM_DRIVER_GET(stm32mp_bsec),
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&dev);
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if (ret) {
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log_err("Can't find stm32mp_bsec driver\n");
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return;
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}
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for (i = 0; i < STM32_OTP_HASH_KEY_SIZE; i++) {
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if (print)
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printf("Fuse OTP %i : %x\n",
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STM32_OTP_HASH_KEY_START + i,
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__be32_to_cpu(*(u32 *)addr));
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word = STM32_OTP_HASH_KEY_START + i;
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val = __be32_to_cpu(*(u32 *)addr);
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misc_write(dev, STM32_BSEC_OTP(word), &val, 4);
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addr += 4;
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}
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}
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static int confirm_prog(void)
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{
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puts("Warning: Programming fuses is an irreversible operation!\n"
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" This may brick your system.\n"
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" Use this command only if you are sure of what you are doing!\n"
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"\nReally perform this fuse programming? <y/N>\n");
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if (confirm_yesno())
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return 1;
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puts("Fuse programming aborted\n");
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return 0;
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}
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static int do_stm32key(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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u32 addr;
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const char *op = argc >= 2 ? argv[1] : NULL;
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int confirmed = argc > 3 && !strcmp(argv[2], "-y");
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argc -= 2 + confirmed;
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argv += 2 + confirmed;
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if (argc < 1)
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return CMD_RET_USAGE;
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addr = simple_strtoul(argv[0], NULL, 16);
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if (!addr)
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return CMD_RET_USAGE;
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if (!strcmp(op, "read"))
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read_hash_value(addr);
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if (!strcmp(op, "fuse")) {
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if (!confirmed && !confirm_prog())
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return CMD_RET_FAILURE;
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fuse_hash_value(addr, !confirmed);
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}
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return CMD_RET_SUCCESS;
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}
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U_BOOT_CMD(stm32key, 4, 1, do_stm32key,
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"Fuse ST Hash key",
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"read <addr>: Read the hash store at addr in memory\n"
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"stm32key fuse [-y] <addr> : Fuse hash store at addr in otp\n");
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