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| author | Patrick Delaunay <patrick.delaunay@st.com> | 2020-06-16 18:27:44 +0200 |
|---|---|---|
| committer | Patrick Delaunay <patrick.delaunay@st.com> | 2020-07-07 16:01:23 +0200 |
| commit | bd3f60d29c2494d156b353c33678be7366caafbd (patch) | |
| tree | 801d0d34f6335506ceaf86a7ee0775f226d44054 /arch/arm/mach-stm32mp/bsec.c | |
| parent | 03c4e6224a0650c6de07f7000db444cd1a30b1cc (diff) | |
| download | u-boot-bd3f60d29c2494d156b353c33678be7366caafbd.tar.gz u-boot-bd3f60d29c2494d156b353c33678be7366caafbd.tar.xz u-boot-bd3f60d29c2494d156b353c33678be7366caafbd.zip | |
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/bsec.c')
| -rw-r--r-- | arch/arm/mach-stm32mp/bsec.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm/mach-stm32mp/bsec.c b/arch/arm/mach-stm32mp/bsec.c index 059ef0b1f5..0c56b440f5 100644 --- a/arch/arm/mach-stm32mp/bsec.c +++ b/arch/arm/mach-stm32mp/bsec.c @@ -8,6 +8,7 @@ #include <log.h> #include <misc.h> #include <asm/io.h> +#include <asm/arch/bsec.h> #include <asm/arch/stm32mp1_smc.h> #include <linux/arm-smccc.h> #include <linux/iopoll.h> @@ -21,6 +22,7 @@ #define BSEC_OTP_WRDATA_OFF 0x008 #define BSEC_OTP_STATUS_OFF 0x00C #define BSEC_OTP_LOCK_OFF 0x010 +#define BSEC_DENABLE_OFF 0x014 #define BSEC_DISTURBED_OFF 0x01C #define BSEC_ERROR_OFF 0x034 #define BSEC_WRLOCK_OFF 0x04C /* OTP write permananet lock */ @@ -46,6 +48,9 @@ #define BSEC_MODE_PROGFAIL_MASK 0x10 #define BSEC_MODE_PWR_MASK 0x20 +/* DENABLE Register */ +#define BSEC_DENABLE_DBGSWENABLE BIT(10) + /* * OTP Lock services definition * Value must corresponding to the bit number in the register @@ -506,3 +511,23 @@ U_BOOT_DRIVER(stm32mp_bsec) = { .ops = &stm32mp_bsec_ops, .probe = stm32mp_bsec_probe, }; + +bool bsec_dbgswenable(void) +{ + struct udevice *dev; + struct stm32mp_bsec_platdata *plat; + int ret; + + ret = uclass_get_device_by_driver(UCLASS_MISC, + DM_GET_DRIVER(stm32mp_bsec), &dev); + if (ret || !dev) { + pr_debug("bsec driver not available\n"); + return false; + } + + plat = dev_get_platdata(dev); + if (readl(plat->base + BSEC_DENABLE_OFF) & BSEC_DENABLE_DBGSWENABLE) + return true; + + return false; +} |