[PATCH u-boot-mvebu 3/4] arm: mvebu: turris_omnia: Print board ECDSA public key if available

[Marek Behún]

If MCU supports the FEAT_CRYPTO feature, read board ECDSA public key
from MCU and print it.

Signed-off-by: Marek Behún <ka...@kernel.org>
---
 board/CZ.NIC/turris_omnia/turris_omnia.c | 29 +++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/board/CZ.NIC/turris_omnia/turris_omnia.c 
b/board/CZ.NIC/turris_omnia/turris_omnia.c
index 7a51ed3ace5..46f576a460e 100644
--- a/board/CZ.NIC/turris_omnia/turris_omnia.c
+++ b/board/CZ.NIC/turris_omnia/turris_omnia.c
@@ -75,6 +75,9 @@ enum mcu_commands {
        /* available if EXT_CMD bit set in features */
        CMD_EXT_CONTROL         = 0x12,
 
+       /* available if CRYPTO bit set in features */
+       CMD_CRYPTO_GET_PUBLIC_KEY       = 0x29,
+
        /* available if BOARD_INFO it set in features */
        CMD_BOARD_INFO_GET      = 0x2c,
 };
@@ -94,6 +97,7 @@ enum status_word_bits {
 enum features_e {
        FEAT_PERIPH_MCU         = BIT(0),
        FEAT_EXT_CMDS           = BIT(1),
+       FEAT_CRYPTO             = BIT(14),
        FEAT_BOARD_INFO         = BIT(15),
 };
 
@@ -285,6 +289,24 @@ static int omnia_mcu_board_info(char *serial, u8 *mac, 
char *version)
        return 0;
 }
 
+static int omnia_mcu_get_board_public_key(char pub_key[static 67])
+{
+       u8 reply[34];
+       int ret;
+
+       ret = omnia_mcu_read(CMD_CRYPTO_GET_PUBLIC_KEY, reply, sizeof(reply));
+       if (ret)
+               return ret;
+
+       if (reply[0] != 33)
+               return -EBADMSG;
+
+       bin2hex(pub_key, &reply[1], 33);
+       reply[66] = '\0';
+
+       return 0;
+}
+
 static void enable_a385_watchdog(unsigned int timeout_minutes)
 {
        struct sar_freq_modes sar_freq;
@@ -1060,7 +1082,7 @@ int board_late_init(void)
 
 int checkboard(void)
 {
-       char serial[17], version[4];
+       char serial[17], version[4], pub_key[67];
        bool has_version;
        int err;
 
@@ -1080,6 +1102,11 @@ int checkboard(void)
        printf("  Board version: %s\n", has_version ? version : "unknown");
        printf("  Serial Number: %s\n", !err ? serial : "unknown");
 
+       if (omnia_mcu_has_feature(FEAT_CRYPTO)) {
+               err = omnia_mcu_get_board_public_key(pub_key);
+               printf("  ECDSA Public Key: %s\n", !err ? pub_key : "unknown");
+       }
+
        return 0;
 }
 
-- 
2.43.0