[PATCH] board: turris: Initialize serial# env

[Stefan Roese]

On 27.08.22 20:06, Pali Rohár wrote:
> Store serial number from atsha cryptochip into the serial# env variable.
> U-Boot automatically puts content of this variable into the root device
> tree property serial-number when booting Linux kernel. Refactor turris
> atsha code and from turris_atsha_otp_get_serial_number() function returns
> directly string suitable for printing or storing into device tree. Because
> during different boot stages is env storage read-only, it is not possible
> to always store serial number into env storage. So introduce a new function
> turris_atsha_otp_init_serial_number() which is called at later stage and
> which ensures that serial number is correctly stored into env.
> 
> Signed-off-by: Pali Rohár <pali at kernel.org>

Reviewed-by: Stefan Roese <sr at denx.de>

Thanks,
Stefan

> ---
>   board/CZ.NIC/turris_atsha_otp.c          | 33 +++++++++++++++++++++---
>   board/CZ.NIC/turris_atsha_otp.h          |  3 ++-
>   board/CZ.NIC/turris_omnia/turris_omnia.c | 11 +++-----
>   3 files changed, 36 insertions(+), 11 deletions(-)
> 
> diff --git a/board/CZ.NIC/turris_atsha_otp.c b/board/CZ.NIC/turris_atsha_otp.c
> index aa4e29b1560e..a29fe3623174 100644
> --- a/board/CZ.NIC/turris_atsha_otp.c
> +++ b/board/CZ.NIC/turris_atsha_otp.c
> @@ -93,30 +93,57 @@ int turris_atsha_otp_init_mac_addresses(int first_idx)
>   	return 0;
>   }
>   
> -int turris_atsha_otp_get_serial_number(u32 *version_num, u32 *serial_num)
> +int turris_atsha_otp_init_serial_number(void)
> +{
> +	char serial[17];
> +	int ret;
> +
> +	ret = turris_atsha_otp_get_serial_number(serial);
> +	if (ret)
> +		return ret;
> +
> +	if (!env_get("serial#"))
> +		return -1;
> +
> +	return 0;
> +}
> +
> +int turris_atsha_otp_get_serial_number(char serial[17])
>   {
>   	struct udevice *dev = get_atsha204a_dev();
> +	u32 version_num, serial_num;
> +	const char *serial_env;
>   	int ret;
>   
>   	if (!dev)
>   		return -1;
>   
> +	serial_env = env_get("serial#");
> +	if (serial_env && strlen(serial_env) == 16) {
> +		memcpy(serial, serial_env, 17);
> +		return 0;
> +	}
> +
>   	ret = atsha204a_wakeup(dev);
>   	if (ret)
>   		return ret;
>   
>   	ret = atsha204a_read(dev, ATSHA204A_ZONE_OTP, false,
>   			     TURRIS_ATSHA_OTP_VERSION,
> -			     (u8 *)version_num);
> +			     (u8 *)&version_num);
>   	if (ret)
>   		return ret;
>   
>   	ret = atsha204a_read(dev, ATSHA204A_ZONE_OTP, false,
>   			     TURRIS_ATSHA_OTP_SERIAL,
> -			     (u8 *)serial_num);
> +			     (u8 *)&serial_num);
>   	if (ret)
>   		return ret;
>   
>   	atsha204a_sleep(dev);
> +
> +	sprintf(serial, "%08X%08X", be32_to_cpu(version_num), be32_to_cpu(serial_num));
> +	env_set("serial#", serial);
> +
>   	return 0;
>   }
> diff --git a/board/CZ.NIC/turris_atsha_otp.h b/board/CZ.NIC/turris_atsha_otp.h
> index bd4308fdc3ef..2cfe20bbc3a7 100644
> --- a/board/CZ.NIC/turris_atsha_otp.h
> +++ b/board/CZ.NIC/turris_atsha_otp.h
> @@ -4,6 +4,7 @@
>   #define TURRIS_ATSHA_OTP_H
>   
>   int turris_atsha_otp_init_mac_addresses(int first_idx);
> -int turris_atsha_otp_get_serial_number(u32 *version_num, u32 *serial_num);
> +int turris_atsha_otp_init_serial_number(void);
> +int turris_atsha_otp_get_serial_number(char serial[17]);
>   
>   #endif
> diff --git a/board/CZ.NIC/turris_omnia/turris_omnia.c b/board/CZ.NIC/turris_omnia/turris_omnia.c
> index ab5061ef582b..cf8a6026702b 100644
> --- a/board/CZ.NIC/turris_omnia/turris_omnia.c
> +++ b/board/CZ.NIC/turris_omnia/turris_omnia.c
> @@ -963,19 +963,15 @@ int board_late_init(void)
>   
>   int show_board_info(void)
>   {
> -	u32 version_num, serial_num;
> +	char serial[17];
>   	int err;
>   
> -	err = turris_atsha_otp_get_serial_number(&version_num, &serial_num);
> +	err = turris_atsha_otp_get_serial_number(serial);
>   	printf("Model: Turris Omnia\n");
>   	printf("  MCU type: %s\n", omnia_get_mcu_type());
>   	printf("  MCU version: %s\n", omnia_get_mcu_version());
>   	printf("  RAM size: %i MiB\n", omnia_get_ram_size_gb() * 1024);
> -	if (err)
> -		printf("  Serial Number: unknown\n");
> -	else
> -		printf("  Serial Number: %08X%08X\n", be32_to_cpu(version_num),
> -		       be32_to_cpu(serial_num));
> +	printf("  Serial Number: %s\n", !err ? serial : "unknown");
>   
>   	return 0;
>   }
> @@ -983,6 +979,7 @@ int show_board_info(void)
>   int misc_init_r(void)
>   {
>   	turris_atsha_otp_init_mac_addresses(1);
> +	turris_atsha_otp_init_serial_number();
>   	return 0;
>   }
>   

Viele Grüße,
Stefan Roese

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-51 Fax: (+49)-8142-66989-80 Email: sr at denx.de