Merge patch series "Enable MCU ESM reset"

Judith Mendez <jm@ti.com> says:

This patch series enables ESM reset configuration in board_init_f
for am62x and am62px devices.

This is necessary in order for error events to reset the system.

This patches are tested using watchdog to reset the system via ESM.

Link: https://lore.kernel.org/r/20250129234403.574766-1-jm@ti.com

4 files changed, 58 insertions, 0 deletions

diff --git a/arch/arm/mach-k3/am62ax/am62a7_init.c b/arch/arm/mach-k3/am62ax/am62a7_init.c
index 78153c97a58..698e6d5c587 100644
--- a/arch/arm/mach-k3/am62ax/am62a7_init.c
+++ b/arch/arm/mach-k3/am62ax/am62a7_init.c
@@ -15,6 +15,9 @@
 #include "../sysfw-loader.h"
 #include "../common.h"
 
+#define CTRLMMR_MCU_RST_CTRL             0x04518170
+#define RST_CTRL_ESM_ERROR_RST_EN_Z_MASK 0xFFFDFFFF
+
 struct fwl_data cbass_main_fwls[] = {
        { "FSS_DAT_REG3", 7, 8 },
 };
@@ -70,6 +73,15 @@ static void ctrl_mmr_unlock(void)
 	mmr_unlock(PADCFG_MMR1_BASE, 1);
 }
 
+static __maybe_unused void enable_mcu_esm_reset(void)
+{
+	/* Set CTRLMMR_MCU_RST_CTRL:MCU_ESM_ERROR_RST_EN_Z  to '0' (low active) */
+	u32 stat = readl(CTRLMMR_MCU_RST_CTRL);
+
+	stat &= RST_CTRL_ESM_ERROR_RST_EN_Z_MASK;
+	writel(stat, CTRLMMR_MCU_RST_CTRL);
+}
+
 void board_init_f(ulong dummy)
 {
 	struct udevice *dev;
@@ -160,6 +172,20 @@ void board_init_f(ulong dummy)
 	/* Output System Firmware version info */
 	k3_sysfw_print_ver();
 
+	if (IS_ENABLED(CONFIG_ESM_K3)) {
+		/* Probe/configure ESM0 */
+		ret = uclass_get_device_by_name(UCLASS_MISC, "esm@420000", &dev);
+		if (ret)
+			printf("esm main init failed: %d\n", ret);
+
+		/* Probe/configure MCUESM */
+		ret = uclass_get_device_by_name(UCLASS_MISC, "esm@4100000", &dev);
+		if (ret)
+			printf("esm mcu init failed: %d\n", ret);
+
+		enable_mcu_esm_reset();
+	}
+
 #if defined(CONFIG_K3_AM62A_DDRSS)
 	ret = uclass_get_device(UCLASS_RAM, 0, &dev);
 	if (ret)
diff --git a/arch/arm/mach-k3/am62px/am62p5_init.c b/arch/arm/mach-k3/am62px/am62p5_init.c
index 7a24cf39c7b..14a46fa28d2 100644
--- a/arch/arm/mach-k3/am62px/am62p5_init.c
+++ b/arch/arm/mach-k3/am62px/am62p5_init.c
@@ -19,6 +19,9 @@
 /* TISCI DEV ID for A53 Clock */
 #define AM62PX_DEV_A53SS0_CORE_0_DEV_ID 135
 
+#define CTRLMMR_MCU_RST_CTRL             0x04518170
+#define RST_CTRL_ESM_ERROR_RST_EN_Z_MASK 0xFFFDFFFF
+
 struct fwl_data cbass_main_fwls[] = {
 	{ "FSS_DAT_REG3", 7, 8 },
 };
@@ -127,6 +130,15 @@ static void fixup_a53_cpu_freq_by_speed_grade(void)
 }
 #endif
 
+static __maybe_unused void enable_mcu_esm_reset(void)
+{
+	/* Set CTRLMMR_MCU_RST_CTRL:MCU_ESM_ERROR_RST_EN_Z  to '0' (low active) */
+	u32 stat = readl(CTRLMMR_MCU_RST_CTRL);
+
+	stat &= RST_CTRL_ESM_ERROR_RST_EN_Z_MASK;
+	writel(stat, CTRLMMR_MCU_RST_CTRL);
+}
+
 void board_init_f(ulong dummy)
 {
 	struct udevice *dev;
@@ -218,6 +230,20 @@ void board_init_f(ulong dummy)
 			panic("DRAM init failed: %d\n", ret);
 	}
 
+	if (IS_ENABLED(CONFIG_ESM_K3)) {
+		/* Probe/configure ESM0 */
+		ret = uclass_get_device_by_name(UCLASS_MISC, "esm@420000", &dev);
+		if (ret)
+			printf("esm main init failed: %d\n", ret);
+
+		/* Probe/configure MCUESM */
+		ret = uclass_get_device_by_name(UCLASS_MISC, "esm@4100000", &dev);
+		if (ret)
+			printf("esm mcu init failed: %d\n", ret);
+
+		enable_mcu_esm_reset();
+	}
+
 	spl_enable_cache();
 
 	setup_qos();
diff --git a/configs/am62ax_evm_r5_defconfig b/configs/am62ax_evm_r5_defconfig
index 1f7750c4c03..58cad17b5d5 100644
--- a/configs/am62ax_evm_r5_defconfig
+++ b/configs/am62ax_evm_r5_defconfig
@@ -13,6 +13,7 @@ CONFIG_DEFAULT_DEVICE_TREE="k3-am62a7-r5-sk"
 CONFIG_DM_RESET=y
 CONFIG_SPL_MMC=y
 CONFIG_SPL_SERIAL=y
+CONFIG_SPL_DRIVERS_MISC=y
 CONFIG_SPL_STACK_R_ADDR=0x82000000
 CONFIG_SPL_SYS_MALLOC_F_LEN=0x7145
 CONFIG_SPL_TEXT_BASE=0x43c00000
@@ -82,6 +83,8 @@ CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_OMAP24XX=y
 CONFIG_DM_MAILBOX=y
 CONFIG_K3_SEC_PROXY=y
+CONFIG_SPL_MISC=y
+CONFIG_ESM_K3=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_ADMA=y
 CONFIG_SPL_MMC_SDHCI_ADMA=y
diff --git a/configs/am62px_evm_r5_defconfig b/configs/am62px_evm_r5_defconfig
index c3adfb8697a..54ea4bfb620 100644
--- a/configs/am62px_evm_r5_defconfig
+++ b/configs/am62px_evm_r5_defconfig
@@ -16,6 +16,7 @@ CONFIG_DEFAULT_DEVICE_TREE="k3-am62p5-r5-sk"
 CONFIG_DM_RESET=y
 CONFIG_SPL_MMC=y
 CONFIG_SPL_SERIAL=y
+CONFIG_SPL_DRIVERS_MISC=y
 CONFIG_SPL_STACK_R_ADDR=0x82000000
 CONFIG_SPL_SYS_MALLOC_F_LEN=0x8000
 CONFIG_SPL_TEXT_BASE=0x43c00000
@@ -87,6 +88,8 @@ CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_OMAP24XX=y
 CONFIG_DM_MAILBOX=y
 CONFIG_K3_SEC_PROXY=y
+CONFIG_SPL_MISC=y
+CONFIG_ESM_K3=y
 CONFIG_MMC_HS400_SUPPORT=y
 CONFIG_MMC_SDHCI=y
 CONFIG_MMC_SDHCI_ADMA=y