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// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
/*
* Copyright (C) 2019, STMicroelectronics - All Rights Reserved
*/
#include <common.h>
#include <command.h>
#include <console.h>
#include <misc.h>
#include <dm/device.h>
#include <dm/uclass.h>
#define STM32_OTP_HASH_KEY_START 24
#define STM32_OTP_HASH_KEY_SIZE 8
static void read_hash_value(u32 addr)
{
int i;
for (i = 0; i < STM32_OTP_HASH_KEY_SIZE; i++) {
printf("OTP value %i: %x\n", STM32_OTP_HASH_KEY_START + i,
__be32_to_cpu(*(u32 *)addr));
addr += 4;
}
}
static void fuse_hash_value(u32 addr, bool print)
{
struct udevice *dev;
u32 word, val;
int i, ret;
ret = uclass_get_device_by_driver(UCLASS_MISC,
DM_GET_DRIVER(stm32mp_bsec),
&dev);
if (ret) {
pr_err("Can't find stm32mp_bsec driver\n");
return;
}
for (i = 0; i < STM32_OTP_HASH_KEY_SIZE; i++) {
if (print)
printf("Fuse OTP %i : %x\n",
STM32_OTP_HASH_KEY_START + i,
__be32_to_cpu(*(u32 *)addr));
word = STM32_OTP_HASH_KEY_START + i;
val = __be32_to_cpu(*(u32 *)addr);
misc_write(dev, STM32_BSEC_OTP(word), &val, 4);
addr += 4;
}
}
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_stm32key(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
u32 addr;
const char *op = argc >= 2 ? argv[1] : NULL;
int confirmed = argc > 3 && !strcmp(argv[2], "-y");
argc -= 2 + confirmed;
argv += 2 + confirmed;
if (argc < 1)
return CMD_RET_USAGE;
addr = simple_strtoul(argv[0], NULL, 16);
if (!addr)
return CMD_RET_USAGE;
if (!strcmp(op, "read"))
read_hash_value(addr);
if (!strcmp(op, "fuse")) {
if (!confirmed && !confirm_prog())
return CMD_RET_FAILURE;
fuse_hash_value(addr, !confirmed);
}
return CMD_RET_SUCCESS;
}
U_BOOT_CMD(stm32key, 4, 1, do_stm32key,
"Fuse ST Hash key",
"read <addr>: Read the hash store at addr in memory\n"
"stm32key fuse [-y] <addr> : Fuse hash store at addr in otp\n");
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