[PATCH 18/20] board: ti: evm: Store wakeup reason on scratchpad memory

[Richard Genoud (TI)]

From: Abhash Kumar Jha <a-kumar2 at ti.com>

While resuming from suspend, the wakeup reason need to be stored
and this will be used by the Linux kernel once its up.

Use the 32 bytes of MCU_PSRAM0_RAM area (addr = 0x40280000) to
store the wakeup reason.

Read the value as soon as it starts and store it internally.

Signed-off-by: Abhash Kumar Jha <a-kumar2 at ti.com>
---
 arch/arm/mach-k3/include/mach/j721e_hardware.h  | 1 +
 arch/arm/mach-k3/include/mach/j784s4_hardware.h | 1 +
 board/ti/common/k3-lpm.h                        | 5 +++++
 board/ti/j721e/evm.c                            | 9 +++++++++
 board/ti/j784s4/evm.c                           | 9 +++++++++
 5 files changed, 25 insertions(+)

diff --git a/arch/arm/mach-k3/include/mach/j721e_hardware.h b/arch/arm/mach-k3/include/mach/j721e_hardware.h
index 587dd10eb1ea..d58e2b3e1bb2 100644
--- a/arch/arm/mach-k3/include/mach/j721e_hardware.h
+++ b/arch/arm/mach-k3/include/mach/j721e_hardware.h
@@ -47,6 +47,7 @@
 
 /* MCU SCRATCHPAD usage */
 #define TI_SRAM_SCRATCH_BOARD_EEPROM_START	CONFIG_SYS_K3_MCU_SCRATCHPAD_BASE
+#define TI_SRAM_SCRATCH_LPM_START		0x40280000
 
 #if defined(CONFIG_SYS_K3_SPL_ATF) && !defined(__ASSEMBLY__)
 
diff --git a/arch/arm/mach-k3/include/mach/j784s4_hardware.h b/arch/arm/mach-k3/include/mach/j784s4_hardware.h
index dd51473419dd..2fc81902f879 100644
--- a/arch/arm/mach-k3/include/mach/j784s4_hardware.h
+++ b/arch/arm/mach-k3/include/mach/j784s4_hardware.h
@@ -46,6 +46,7 @@
 
 /* MCU SCRATCHPAD usage */
 #define TI_SRAM_SCRATCH_BOARD_EEPROM_START	CONFIG_SYS_K3_MCU_SCRATCHPAD_BASE
+#define TI_SRAM_SCRATCH_LPM_START		0x40280000
 
 #if defined(CONFIG_SYS_K3_SPL_ATF) && !defined(__ASSEMBLY__)
 
diff --git a/board/ti/common/k3-lpm.h b/board/ti/common/k3-lpm.h
index a2141a0c25a8..dfd8f8486f08 100644
--- a/board/ti/common/k3-lpm.h
+++ b/board/ti/common/k3-lpm.h
@@ -13,5 +13,10 @@
 /* PMIC register where the magic value resides */
 #define K3_LPM_SCRATCH_PAD_REG 0xcb
 
+struct lpm_scratch_space {
+	u16 wake_src;
+	u16 reserved;
+} __packed;
+
 #endif /* __K3_LPM_H */
 
diff --git a/board/ti/j721e/evm.c b/board/ti/j721e/evm.c
index 41eea1bdea95..a9f469fea1f7 100644
--- a/board/ti/j721e/evm.c
+++ b/board/ti/j721e/evm.c
@@ -474,6 +474,9 @@ err_free_gpio:
 
 #if (IS_ENABLED(CONFIG_SPL_BUILD) && IS_ENABLED(CONFIG_TARGET_J7200_R5_EVM))
 
+#define LPM_WAKE_SOURCE_PMIC_GPIO 0x91
+#define LPM_WAKE_SOURCE_MAIN_IO   0x80
+
 static void clear_isolation(void)
 {
 	int ret;
@@ -498,12 +501,15 @@ bool j7xx_board_is_resuming(void)
 {
 	struct udevice *pmica;
 	u32 pmctrl_val = readl(PMCTRL_IO_1);
+	struct lpm_scratch_space *lpm_scratch;
 	int ret;
 
 	if (gd_k3_resuming() != K3_RESUME_STATE_UNKNOWN)
 		goto end;
 
+	lpm_scratch = (struct lpm_scratch_space *)TI_SRAM_SCRATCH_LPM_START;
 	if ((pmctrl_val & IO_ISO_STATUS) == IO_ISO_STATUS) {
+		lpm_scratch->wake_src = LPM_WAKE_SOURCE_MAIN_IO;
 		clear_isolation();
 		gd_set_k3_resuming(K3_RESUME_STATE_RESUMING);
 		debug("Resuming from IO_DDR mode\n");
@@ -520,6 +526,7 @@ bool j7xx_board_is_resuming(void)
 
 	if (pmic_reg_read(pmica, K3_LPM_SCRATCH_PAD_REG) == K3_LPM_MAGIC_SUSPEND) {
 		debug("%s: board is resuming\n", __func__);
+		lpm_scratch->wake_src = LPM_WAKE_SOURCE_PMIC_GPIO;
 		gd_set_k3_resuming(K3_RESUME_STATE_RESUMING);
 
 		/* clean magic suspend */
@@ -527,6 +534,8 @@ bool j7xx_board_is_resuming(void)
 			printf("Failed to clean magic value for suspend detection in PMICA\n");
 	} else {
 		debug("%s: board is booting (no resume detected)\n", __func__);
+		lpm_scratch->wake_src = 0;
+		lpm_scratch->reserved = 0;
 		gd_set_k3_resuming(K3_RESUME_STATE_BOOTING);
 	}
 end:
diff --git a/board/ti/j784s4/evm.c b/board/ti/j784s4/evm.c
index eef56556a33c..b94ec7f3653b 100644
--- a/board/ti/j784s4/evm.c
+++ b/board/ti/j784s4/evm.c
@@ -68,6 +68,9 @@ int board_late_init(void)
 #if (IS_ENABLED(CONFIG_SPL_BUILD) && (IS_ENABLED(CONFIG_TARGET_J784S4_R5_EVM) || \
 				      IS_ENABLED(CONFIG_TARGET_J742S2_R5_EVM)))
 
+#define LPM_WAKE_SOURCE_PMIC_GPIO 0x91
+#define LPM_WAKE_SOURCE_MCU_IO    0x81
+
 static void clear_isolation(void)
 {
 	int ret;
@@ -93,12 +96,15 @@ bool j7xx_board_is_resuming(void)
 {
 	struct udevice *pmic;
 	u32 pmctrl_val = readl(WKUP_CTRL_MMR0_BASE + PMCTRL_IO_0);
+	struct lpm_scratch_space *lpm_scratch;
 	int err;
 
 	if (gd_k3_resuming() != K3_RESUME_STATE_UNKNOWN)
 		goto end;
 
+	lpm_scratch = (struct lpm_scratch_space *)TI_SRAM_SCRATCH_LPM_START;
 	if ((pmctrl_val & IO_ISO_STATUS) == IO_ISO_STATUS) {
+		lpm_scratch->wake_src = LPM_WAKE_SOURCE_MCU_IO;
 		clear_isolation();
 		gd_set_k3_resuming(K3_RESUME_STATE_RESUMING);
 		debug("board is resuming from IO_DDR mode\n");
@@ -115,6 +121,7 @@ bool j7xx_board_is_resuming(void)
 
 	if (pmic_reg_read(pmic, K3_LPM_SCRATCH_PAD_REG) == K3_LPM_MAGIC_SUSPEND) {
 		debug("%s: board is resuming\n", __func__);
+		lpm_scratch->wake_src = LPM_WAKE_SOURCE_PMIC_GPIO;
 		gd_set_k3_resuming(K3_RESUME_STATE_RESUMING);
 
 		/* clean magic suspend */
@@ -122,6 +129,8 @@ bool j7xx_board_is_resuming(void)
 			printf("Failed to clean magic value for suspend detection in PMIC\n");
 	} else {
 		debug("%s: board is booting (no resume detected)\n", __func__);
+		lpm_scratch->wake_src = 0;
+		lpm_scratch->reserved = 0;
 		gd_set_k3_resuming(K3_RESUME_STATE_BOOTING);
 	}
 end: