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feat(stm32mp1): add "Boot mode" management for STM32MP13 

Add new APIs to enter and exit "boot mode".

In this mode a potential tamper won't block access or reset
the secure IPs needed while boot, without this mode a dead
lock may occurs.

Change-Id: Iad60d4a0420ec125b842a285f73a20eb54cd1828
Signed-off-by: Nicolas Toromanoff <nicolas.toromanoff@st.com>
This commit is contained in:
Nicolas Toromanoff 2021-02-03 16:52:03 +01:00 committed by Yann Gautier
parent fca10a8f1b
commit 296ac8012b
2 changed files with 26 additions and 0 deletions
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8
plat/st/stm32mp1/include/stm32mp1_private.h
View File

@ -23,6 +23,14 @@ void stm32mp1_syscfg_enable_io_compensation_finish(void);
void stm32mp1_syscfg_disable_io_compensation(void);
uint32_t stm32mp1_syscfg_get_chip_version(void);
uint32_t stm32mp1_syscfg_get_chip_dev_id(void);
#if STM32MP13
void stm32mp1_syscfg_boot_mode_enable(void);
void stm32mp1_syscfg_boot_mode_disable(void);
#endif
#if STM32MP15
static inline void stm32mp1_syscfg_boot_mode_enable(void){}
static inline void stm32mp1_syscfg_boot_mode_disable(void){}
#endif
void stm32mp1_deconfigure_uart_pins(void);

18
plat/st/stm32mp1/stm32mp1_syscfg.c
View File

@ -24,6 +24,7 @@
* SYSCFG REGISTER OFFSET (base relative)
*/
#define SYSCFG_BOOTR 0x00U
#define SYSCFG_BOOTCR 0x0CU
#if STM32MP15
#define SYSCFG_IOCTRLSETR 0x18U
#define SYSCFG_ICNR 0x1CU
@ -54,6 +55,11 @@
#define SYSCFG_BOOTR_BOOTPD_SHIFT 4
#endif
/*
* SYSCFG_BOOTCR Register
*/
#define SYSCFG_BOOTCR_BMEN BIT(0)
/*
* SYSCFG_IOCTRLSETR Register
*/
@ -391,3 +397,15 @@ uint32_t stm32mp1_syscfg_get_chip_dev_id(void)
{
return mmio_read_32(SYSCFG_BASE + SYSCFG_IDC) & SYSCFG_IDC_DEV_ID_MASK;
}
#if STM32MP13
void stm32mp1_syscfg_boot_mode_enable(void)
{
mmio_setbits_32(SYSCFG_BASE + SYSCFG_BOOTCR, SYSCFG_BOOTCR_BMEN);
}
void stm32mp1_syscfg_boot_mode_disable(void)
{
mmio_clrbits_32(SYSCFG_BASE + SYSCFG_BOOTCR, SYSCFG_BOOTCR_BMEN);
}
#endif