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| author | Patrick Delaunay <patrick.delaunay@st.com> | 2020-06-16 19:27:44 +0300 |
|---|---|---|
| committer | Patrick Delaunay <patrick.delaunay@st.com> | 2020-07-07 17:01:23 +0300 |
| commit | bd3f60d29c2494d156b353c33678be7366caafbd (patch) | |
| tree | 801d0d34f6335506ceaf86a7ee0775f226d44054 /arch/arm/mach-stm32mp/cpu.c | |
| parent | 03c4e6224a0650c6de07f7000db444cd1a30b1cc (diff) | |
| download | u-boot-bd3f60d29c2494d156b353c33678be7366caafbd.tar.xz | |
arm: stm32mp: protect DBGMCU_IDC access with BSEC
As debugger must be totally closed on Sec closed chip,
the DBGMCU_IDC register is no more accessible (self
hosted debug is disabled with OTP).
This patch adds a function bsec_dbgswenable() to check
if the DBGMCU registers are available before to access them:
BSEC_DENABLE.DBGSWENABLE = self hosted debug status.
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
Diffstat (limited to 'arch/arm/mach-stm32mp/cpu.c')
| -rw-r--r-- | arch/arm/mach-stm32mp/cpu.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/arch/arm/mach-stm32mp/cpu.c b/arch/arm/mach-stm32mp/cpu.c index 472b140321..382067190c 100644 --- a/arch/arm/mach-stm32mp/cpu.c +++ b/arch/arm/mach-stm32mp/cpu.c @@ -12,6 +12,7 @@ #include <misc.h> #include <net.h> #include <asm/io.h> +#include <asm/arch/bsec.h> #include <asm/arch/stm32.h> #include <asm/arch/sys_proto.h> #include <dm/device.h> @@ -155,8 +156,13 @@ static void dbgmcu_init(void) { setbits_le32(RCC_DBGCFGR, RCC_DBGCFGR_DBGCKEN); - /* Freeze IWDG2 if Cortex-A7 is in debug mode */ - setbits_le32(DBGMCU_APB4FZ1, DBGMCU_APB4FZ1_IWDG2); + /* + * Freeze IWDG2 if Cortex-A7 is in debug mode + * done in TF-A for TRUSTED boot and + * DBGMCU access is controlled by BSEC_DENABLE.DBGSWENABLE + */ + if (!IS_ENABLED(CONFIG_TFABOOT) && bsec_dbgswenable()) + setbits_le32(DBGMCU_APB4FZ1, DBGMCU_APB4FZ1_IWDG2); } #endif /* !defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD) */ @@ -276,9 +282,17 @@ void enable_caches(void) static u32 read_idc(void) { - setbits_le32(RCC_DBGCFGR, RCC_DBGCFGR_DBGCKEN); + /* DBGMCU access is controlled by BSEC_DENABLE.DBGSWENABLE */ + if (bsec_dbgswenable()) { + setbits_le32(RCC_DBGCFGR, RCC_DBGCFGR_DBGCKEN); - return readl(DBGMCU_IDC); + return readl(DBGMCU_IDC); + } + + if (CONFIG_IS_ENABLED(STM32MP15x)) + return CPU_DEV_STM32MP15; /* STM32MP15x and unknown revision */ + else + return 0x0; } u32 get_cpu_dev(void) |