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stm32mp1: read auth stats and boot_partition from tamp

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Obtain from TAMP backup register information about image authorization
status and partition id used for booting. Store this info in
environmental variables ("boot_auth" and "boot_part" correspondingly).

Image authorization supported values:
0x0 - No authentication done
0x1 - Authentication done and failed
0x2 - Authentication done and succeeded

These values are stored to TAMP backup register by Trusted Firmware-A [1].

Testing:
STM32MP> print boot_part
boot_part=1
STM32MP> print boot_auth
boot_auth=2

[1] https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/commit/?h=refs/heads/integration&id=ab2b325c1ab895e626d4e11a9f26b9e7c968f8d8

Signed-off-by: Igor Opaniuk <igor.opaniuk@foundries.io>
Co-developed-by: Oleksandr Suvorov <oleksandr.suvorov@foundries.io>
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@foundries.io>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Igor Opaniuk 2023-11-06 11:41:52 +01:00 committed by Patrice Chotard
parent 6d84f6bc75
commit c205fe979e
3 changed files with 30 additions and 0 deletions
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23
arch/arm/mach-stm32mp/cpu.c
View file

@ -40,6 +40,13 @@ u32 get_bootmode(void)
TAMP_BOOT_MODE_SHIFT;
}
u32 get_bootauth(void)
{
/* read boot auth status and partition from TAMP backup register */
return (readl(TAMP_BOOT_CONTEXT) & TAMP_BOOT_AUTH_MASK) >>
TAMP_BOOT_AUTH_SHIFT;
}
/*
* weak function overidde: set the DDR/SYSRAM executable before to enable the
* MMU and configure DACR, for early early_enable_caches (SPL or pre-reloc)
@ -371,8 +378,24 @@ __weak void stm32mp_misc_init(void)
{
}
static int setup_boot_auth_info(void)
{
char buf[10];
u32 bootauth = get_bootauth();
snprintf(buf, sizeof(buf), "%d", bootauth >> 4);
env_set("boot_auth", buf);
snprintf(buf, sizeof(buf), "%d", bootauth &
(u32)TAMP_BOOT_PARTITION_MASK);
env_set("boot_part", buf);
return 0;
}
int arch_misc_init(void)
{
setup_boot_auth_info();
setup_boot_mode();
setup_mac_address();
setup_serial_number();

4
arch/arm/mach-stm32mp/include/mach/stm32.h
View file

@ -139,8 +139,12 @@ enum boot_device {
#define TAMP_BOOT_MODE_MASK GENMASK(15, 8)
#define TAMP_BOOT_MODE_SHIFT 8
#define TAMP_BOOT_AUTH_MASK GENMASK(23, 16)
#define TAMP_BOOT_AUTH_SHIFT 16
#define TAMP_BOOT_DEVICE_MASK GENMASK(7, 4)
#define TAMP_BOOT_INSTANCE_MASK GENMASK(3, 0)
#define TAMP_BOOT_AUTH_ST_MASK GENMASK(7, 4)
#define TAMP_BOOT_PARTITION_MASK GENMASK(3, 0)
#define TAMP_BOOT_FORCED_MASK GENMASK(7, 0)
enum forced_boot_mode {

3
arch/arm/mach-stm32mp/include/mach/sys_proto.h
View file

@ -66,6 +66,9 @@ void get_soc_name(char name[SOC_NAME_SIZE]);
/* return boot mode */
u32 get_bootmode(void);
/* return auth status and partition */
u32 get_bootauth(void);
int get_eth_nb(void);
int setup_mac_address(void);