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arm: stm32mp: support several key in command stm32key

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Update the command stm32key to support several keys selected by
key name and managed by the new sub-command:

stm32key list
stm32key select [<key>]
stm32key read -a

This patch doesn't change the STM32MP15 behavior, only PKH is
supported, but it is a preliminary patch for STM32MP13 support.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Patrick Delaunay 2022-09-15 18:11:40 +02:00 • committed by Patrice Chotard
parent 8921b3dccd
commit fd1f4c9abd
1 changed files with 148 additions and 45 deletions
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193
arch/arm/mach-stm32mp/cmd_stm32key.c
View file

@ -15,9 +15,37 @@
#define STM32_OTP_CLOSE_ID 0
#define STM32_OTP_CLOSE_MASK BIT(6)
/* HASH of key: 8 OTPs, starting with OTP24) */
#define STM32_OTP_HASH_KEY_START 24
#define STM32_OTP_HASH_KEY_SIZE 8
/* PKH is the first element of the key list */
#define STM32KEY_PKH 0
struct stm32key {
char *name;
char *desc;
u8 start;
u8 size;
};
const struct stm32key stm32mp15_list[] = {
[STM32KEY_PKH] = {
.name = "PKH",
.desc = "Hash of the ECC Public Key (ECDSA is the authentication algorithm)",
.start = 24,
.size = 8,
}
};
/* index of current selected key in stm32key list, 0 = PKH by default */
static u8 stm32key_index;
static u8 get_key_nb(void)
{
return ARRAY_SIZE(stm32mp15_list);
}
static const struct stm32key *get_key(u8 index)
{
return &stm32mp15_list[index];
}
#define BSEC_LOCK_ERROR (-1)
#define BSEC_LOCK_PERM BIT(0)
@ -33,26 +61,25 @@ static int get_misc_dev(struct udevice **dev)
return ret;
}
static void read_hash_value(u32 addr)
static void read_key_value(const struct stm32key *key, u32 addr)
{
int i;
printf("Read KEY at 0x%x\n", addr);
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));
for (i = 0; i < key->size; i++) {
printf("%s OTP %i: [%08x] %08x\n", key->name, key->start + i,
addr, __be32_to_cpu(*(u32 *)addr));
addr += 4;
}
}
static int read_hash_otp(struct udevice *dev, bool print, bool *locked)
static int read_key_otp(struct udevice *dev, const struct stm32key *key, bool print, bool *locked)
{
int i, word, ret;
int nb_invalid = 0, nb_zero = 0, nb_lock = 0;
int nb_invalid = 0, nb_zero = 0, nb_lock = 0, nb_lock_err = 0;
u32 val, lock;
bool status;
for (i = 0, word = STM32_OTP_HASH_KEY_START; i < STM32_OTP_HASH_KEY_SIZE; i++, word++) {
for (i = 0, word = key->start; i < key->size; i++, word++) {
ret = misc_read(dev, STM32_BSEC_OTP(word), &val, 4);
if (ret != 4)
val = ~0x0;
@ -60,29 +87,33 @@ static int read_hash_otp(struct udevice *dev, bool print, bool *locked)
if (ret != 4)
lock = BSEC_LOCK_ERROR;
if (print)
printf("OTP HASH %i: %x lock : %x\n", word, val, lock);
printf("%s OTP %i: %08x lock : %08x\n", key->name, word, val, lock);
if (val == ~0x0)
nb_invalid++;
else if (val == 0x0)
nb_zero++;
if (lock & BSEC_LOCK_PERM)
nb_lock++;
if (lock & BSEC_LOCK_ERROR)
nb_lock_err++;
}
status = (nb_lock == STM32_OTP_HASH_KEY_SIZE);
status = nb_lock_err || (nb_lock == key->size);
if (locked)
*locked = status;
if (!status && print)
printf("Hash of key is not locked!\n");
if (nb_lock_err && print)
printf("%s lock is invalid!\n", key->name);
else if (!status && print)
printf("%s is not locked!\n", key->name);
if (nb_invalid == STM32_OTP_HASH_KEY_SIZE) {
if (nb_invalid == key->size) {
if (print)
printf("Hash of key is invalid!\n");
printf("%s is invalid!\n", key->name);
return -EINVAL;
}
if (nb_zero == STM32_OTP_HASH_KEY_SIZE) {
if (nb_zero == key->size) {
if (print)
printf("Hash of key is free!\n");
printf("%s is free!\n", key->name);
return -ENOENT;
}
@ -113,33 +144,31 @@ static int read_close_status(struct udevice *dev, bool print, bool *closed)
if (closed)
*closed = status;
if (print)
printf("OTP %d: closed status: %d lock : %x\n", word, status, lock);
printf("OTP %d: closed status: %d lock : %08x\n", word, status, lock);
return result;
}
static int fuse_hash_value(struct udevice *dev, u32 addr, bool print)
static int fuse_key_value(struct udevice *dev, const struct stm32key *key, u32 addr, bool print)
{
u32 word, val;
int i, ret;
for (i = 0, word = STM32_OTP_HASH_KEY_START;
i < STM32_OTP_HASH_KEY_SIZE;
i++, word++, addr += 4) {
for (i = 0, word = key->start; i < key->size; i++, word++, addr += 4) {
val = __be32_to_cpu(*(u32 *)addr);
if (print)
printf("Fuse OTP %i : %x\n", word, val);
printf("Fuse %s OTP %i : %08x\n", key->name, word, val);
ret = misc_write(dev, STM32_BSEC_OTP(word), &val, 4);
if (ret != 4) {
log_err("Fuse OTP %i failed\n", word);
log_err("Fuse %s OTP %i failed\n", key->name, word);
return ret;
}
/* on success, lock the OTP for HASH key */
/* on success, lock the OTP for the key */
val = BSEC_LOCK_PERM;
ret = misc_write(dev, STM32_BSEC_LOCK(word), &val, 4);
if (ret != 4) {
log_err("Lock OTP %i failed\n", word);
log_err("Lock %s OTP %i failed\n", key->name, word);
return ret;
}
}
@ -161,36 +190,99 @@ static int confirm_prog(void)
return 0;
}
static void display_key_info(const struct stm32key *key)
{
printf("%s : %s\n", key->name, key->desc);
printf("\tOTP%d..%d\n", key->start, key->start + key->size);
}
static int do_stm32key_list(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
int i;
for (i = 0; i < get_key_nb(); i++)
display_key_info(get_key(i));
return CMD_RET_SUCCESS;
}
static int do_stm32key_select(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
const struct stm32key *key;
int i;
if (argc == 1) {
printf("Selected key:\n");
key = get_key(stm32key_index);
display_key_info(key);
return CMD_RET_SUCCESS;
}
for (i = 0; i < get_key_nb(); i++) {
key = get_key(i);
if (!strcmp(key->name, argv[1])) {
printf("%s selected\n", key->name);
stm32key_index = i;
return CMD_RET_SUCCESS;
}
}
printf("Unknown key %s\n", argv[1]);
return CMD_RET_FAILURE;
}
static int do_stm32key_read(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
const struct stm32key *key;
struct udevice *dev;
u32 addr;
int ret;
int ret, i;
int result;
ret = get_misc_dev(&dev);
if (argc == 1) {
if (ret)
return CMD_RET_FAILURE;
read_hash_otp(dev, true, NULL);
ret = read_close_status(dev, true, NULL);
key = get_key(stm32key_index);
ret = read_key_otp(dev, key, true, NULL);
if (ret != -ENOENT)
return CMD_RET_FAILURE;
return CMD_RET_SUCCESS;
}
if (!strcmp("-a", argv[1])) {
if (ret)
return CMD_RET_FAILURE;
result = CMD_RET_SUCCESS;
for (i = 0; i < get_key_nb(); i++) {
key = get_key(i);
ret = read_key_otp(dev, key, true, NULL);
if (ret != -ENOENT)
result = CMD_RET_FAILURE;
}
ret = read_close_status(dev, true, NULL);
if (ret)
result = CMD_RET_FAILURE;
return CMD_RET_SUCCESS;
return result;
}
addr = hextoul(argv[1], NULL);
if (!addr)
return CMD_RET_USAGE;
read_hash_value(addr);
key = get_key(stm32key_index);
printf("Read %s at 0x%08x\n", key->name, addr);
read_key_value(key, addr);
return CMD_RET_SUCCESS;
}
static int do_stm32key_fuse(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
const struct stm32key *key = get_key(stm32key_index);
struct udevice *dev;
u32 addr;
int ret;
@ -213,28 +305,34 @@ static int do_stm32key_fuse(struct cmd_tbl *cmdtp, int flag, int argc, char *con
if (ret)
return CMD_RET_FAILURE;
if (read_hash_otp(dev, !yes, &lock) != -ENOENT) {
if (read_key_otp(dev, key, !yes, &lock) != -ENOENT) {
printf("Error: can't fuse again the OTP\n");
return CMD_RET_FAILURE;
}
if (lock) {
printf("Error: PKH is locked\n");
printf("Error: %s is locked\n", key->name);
return CMD_RET_FAILURE;
}
if (!yes) {
printf("Writing %s with\n", key->name);
read_key_value(key, addr);
}
if (!yes && !confirm_prog())
return CMD_RET_FAILURE;
if (fuse_hash_value(dev, addr, !yes))
if (fuse_key_value(dev, key, addr, !yes))
return CMD_RET_FAILURE;
printf("Hash key updated !\n");
printf("%s updated !\n", key->name);
return CMD_RET_SUCCESS;
}
static int do_stm32key_close(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
const struct stm32key *key;
bool yes, lock, closed;
struct udevice *dev;
u32 val;
@ -260,14 +358,15 @@ static int do_stm32key_close(struct cmd_tbl *cmdtp, int flag, int argc, char *co
}
/* check PKH status before to close */
ret = read_hash_otp(dev, !yes, &lock);
key = get_key(STM32KEY_PKH);
ret = read_key_otp(dev, key, !yes, &lock);
if (ret) {
if (ret == -ENOENT)
printf("Error: OTP not programmed!\n");
printf("Error: %s not programmed!\n", key->name);
return CMD_RET_FAILURE;
}
if (!lock)
printf("Warning: OTP not locked!\n");
printf("Warning: %s not locked!\n", key->name);
if (!yes && !confirm_prog())
return CMD_RET_FAILURE;
@ -275,7 +374,7 @@ static int do_stm32key_close(struct cmd_tbl *cmdtp, int flag, int argc, char *co
val = STM32_OTP_CLOSE_MASK;
ret = misc_write(dev, STM32_BSEC_OTP(STM32_OTP_CLOSE_ID), &val, 4);
if (ret != 4) {
printf("Error: can't update OTP\n");
printf("Error: can't update OTP %d\n", STM32_OTP_CLOSE_ID);
return CMD_RET_FAILURE;
}
@ -285,11 +384,15 @@ static int do_stm32key_close(struct cmd_tbl *cmdtp, int flag, int argc, char *co
}
static char stm32key_help_text[] =
"read [<addr>]: Read the hash stored at addr in memory or in OTP\n"
"stm32key fuse [-y] <addr> : Fuse hash stored at addr in OTP\n"
"stm32key close [-y] : Close the device, the hash stored in OTP\n";
"list : list the supported key with description\n"
"stm32key select [<key>] : Select the key identified by <key> or display the key used for read/fuse command\n"
"stm32key read [<addr> | -a ] : Read the curent key at <addr> or current / all (-a) key in OTP\n"
"stm32key fuse [-y] <addr> : Fuse the current key at addr in OTP\n"
"stm32key close [-y] : Close the device\n";
U_BOOT_CMD_WITH_SUBCMDS(stm32key, "Fuse ST Hash key", stm32key_help_text,
U_BOOT_CMD_WITH_SUBCMDS(stm32key, "Manage key on STM32", stm32key_help_text,
U_BOOT_SUBCMD_MKENT(list, 1, 0, do_stm32key_list),
U_BOOT_SUBCMD_MKENT(select, 2, 0, do_stm32key_select),
U_BOOT_SUBCMD_MKENT(read, 2, 0, do_stm32key_read),
U_BOOT_SUBCMD_MKENT(fuse, 3, 0, do_stm32key_fuse),
U_BOOT_SUBCMD_MKENT(close, 2, 0, do_stm32key_close));