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
read_hash_value(u32 addr)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
fuse_hash_value(u32 addr,bool print)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
confirm_prog(void)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
do_stm32key(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])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");
102