commit 1877b13803c8ed1cf4012633a88e5f88bd7239ec
author Nicolas Toromanoff <nicolas.toromanoff@st.com> Wed Feb 03 16:52:03 2021 +0100
committer Yann Gautier <yann.gautier@st.com> Tue Mar 22 09:09:23 2022 +0100
tree 7dde9a1b48ea5eaa52585e74188ed2486435220c
parent 07cf3f2cdf7731867a9a86c95348b8a1b02b3f12

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>

plat/st/stm32mp1/stm32mp1_syscfg.c

diff --git a/plat/st/stm32mp1/stm32mp1_syscfg.c b/plat/st/stm32mp1/stm32mp1_syscfg.c
index 39ad90b..ff79428 100644
--- a/plat/st/stm32mp1/stm32mp1_syscfg.c
+++ b/plat/st/stm32mp1/stm32mp1_syscfg.c
@@ -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
@@ -55,6 +56,11 @@
 #endif
 
 /*
+ * SYSCFG_BOOTCR Register
+ */
+#define SYSCFG_BOOTCR_BMEN			BIT(0)
+
+/*
  * SYSCFG_IOCTRLSETR Register
  */
 #define SYSCFG_IOCTRLSETR_HSLVEN_TRACE		BIT(0)
@@ -391,3 +397,15 @@
 {
 	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