soc: infineon: Support for power management on 20829

- Initial changes in board, dts, and soc files to support
 system power management

Signed-off-by: Sreeram Tatapudi <sreeram.praveen@infineon.com>

boards/infineon/cyw920829m2evk_02/cyw920829m2evk_02.dts

@@ -81,6 +81,10 @@ uart2: &scb2 {
 	status = "okay";
 };
 
+&mcwdt0 {
+	status = "okay";
+};
+
 &bluetooth {
 	status = "okay";
 };

boards/infineon/cyw920829m2evk_02/cyw920829m2evk_02_defconfig

@@ -4,7 +4,6 @@
 #
 
 # General configuration
-CONFIG_CORTEX_M_SYSTICK=y
 CONFIG_BUILD_OUTPUT_HEX=y
 CONFIG_BUILD_OUTPUT_BIN=y
 

dts/arm/infineon/cat1b/cyw20829/cyw20829.dtsi

@@ -16,6 +16,21 @@
 			device_type = "cpu";
 			compatible = "arm,cortex-m33";
 			reg = <0>;
+			cpu-power-states = <&idle &suspend_to_ram>;
+		};
+
+		power-states {
+			idle: idle {
+				compatible = "zephyr,power-state";
+				power-state-name = "suspend-to-idle";
+				min-residency-us = <1000000>;
+			};
+
+			suspend_to_ram: suspend_to_ram {
+				compatible = "zephyr,power-state";
+				power-state-name = "suspend-to-ram";
+				min-residency-us = <2000000>;
+			};
 		};
 	};
 

modules/hal_infineon/mtb-pdl-cat1/CMakeLists.txt

@@ -90,6 +90,8 @@ if(CONFIG_SOC_FAMILY_INFINEON_CAT1B)
   zephyr_library_sources(${pdl_drv_dir}/source/cy_systick_v2.c)
   zephyr_library_sources(${pdl_drv_dir}/source/cy_syspm_v2.c)
   zephyr_library_sources(${pdl_drv_dir}/source/cy_syspm_btss.c)
+  zephyr_library_sources(${pdl_drv_dir}/source/cy_syspm_ppu.c)
+  zephyr_library_sources(${pdl_drv_dir}/source/ppu_v1.c)
 endif()
 zephyr_library_sources(${pdl_drv_dir}/source/cy_syslib.c)
 zephyr_library_sources(${pdl_drv_dir}/source/cy_syspm.c)

soc/infineon/cat1b/cyw20829/CMakeLists.txt

@@ -5,6 +5,8 @@ zephyr_sources(soc.c)
 zephyr_sources(app_header.c)
 zephyr_include_directories(.)
 
+zephyr_sources_ifdef(CONFIG_PM power.c)
+
 # CAT1B family defines
 zephyr_compile_definitions_ifdef(CONFIG_SOC_FAMILY_INFINEON_CAT1 CY_USING_HAL)
 zephyr_compile_definitions_ifdef(CONFIG_SOC_FAMILY_INFINEON_CAT1B COMPONENT_CAT1B)

soc/infineon/cat1b/cyw20829/Kconfig

@@ -12,3 +12,4 @@ config SOC_SERIES_CYW20829
 	select CPU_HAS_FPU
 	select DYNAMIC_INTERRUPTS
 	select HAS_SEGGER_RTT if ZEPHYR_SEGGER_MODULE
+	select HAS_PM

soc/infineon/cat1b/cyw20829/Kconfig.defconfig

@@ -6,6 +6,12 @@
 
 if SOC_DIE_CYW20829
 
+config INFINEON_CAT1_LP_TIMER
+	bool
+
+config CORTEX_M_SYSTICK
+	default n if INFINEON_CAT1_LP_TIMER
+
 config NUM_IRQS
 	default 70
 

soc/infineon/cat1b/cyw20829/power.c

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2021 Cypress Semiconductor Corporation (an Infineon company) or
+ * an affiliate of Cypress Semiconductor Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/pm/pm.h>
+#include <zephyr/logging/log.h>
+
+#include <cyhal_syspm.h>
+#include <cyhal_lptimer.h>
+
+LOG_MODULE_REGISTER(soc_power, CONFIG_SOC_LOG_LEVEL);
+
+/*
+ * Called from pm_system_suspend(int32_t ticks) in subsys/power.c
+ * For deep sleep pm_system_suspend has executed all the driver
+ * power management call backs.
+ */
+void pm_state_set(enum pm_state state, uint8_t substate_id)
+{
+	ARG_UNUSED(substate_id);
+
+	/* Set BASEPRI to 0 */
+	irq_unlock(0);
+
+	switch (state) {
+	case PM_STATE_SUSPEND_TO_IDLE:
+		LOG_DBG("Entering PM state suspend to idle");
+		cyhal_syspm_sleep();
+		break;
+	case PM_STATE_SUSPEND_TO_RAM:
+		LOG_DBG("Entering PM state suspend to RAM");
+		cyhal_syspm_deepsleep();
+
+		/*
+		 * The HAL function doesn't clear this bit.  It is a problem
+		 * if the Zephyr idle function executes the wfi instruction
+		 * with this bit set.  We will always clear it here to avoid
+		 * that situation.
+		 */
+		SCB_SCR &= (uint32_t)~SCB_SCR_SLEEPDEEP_Msk;
+		break;
+	default:
+		LOG_DBG("Unsupported power state %u", state);
+		break;
+	}
+}
+
+void pm_state_exit_post_ops(enum pm_state state, uint8_t substate_id)
+{
+	ARG_UNUSED(substate_id);
+
+	switch (state) {
+	case PM_STATE_SUSPEND_TO_IDLE:
+	case PM_STATE_SUSPEND_TO_RAM:
+		break;
+
+	default:
+		break;
+	}
+}
+
+int ifx_pm_init(void)
+{
+	/* System Domain Idle Power Mode Configuration */
+	Cy_SysPm_SetDeepSleepMode(CY_SYSPM_MODE_DEEPSLEEP);
+
+	return cyhal_syspm_init();
+}

soc/infineon/cat1b/cyw20829/soc.c

@@ -11,10 +11,13 @@
 #include <zephyr/device.h>
 #include <zephyr/init.h>
 #include <zephyr/kernel.h>
+
 #include <cy_sysint.h>
 #include <system_cat1b.h>
 #include "cy_pdl.h"
 
+extern int ifx_pm_init(void);
+
 cy_en_sysint_status_t Cy_SysInt_Init(const cy_stc_sysint_t *config, cy_israddress userIsr)
 {
 	CY_ASSERT_L3(CY_SYSINT_IS_PRIORITY_VALID(config->intrPriority));
@@ -94,3 +97,10 @@ static int init_cycfg_platform_wrapper(void)
 }
 
 SYS_INIT(init_cycfg_platform_wrapper, PRE_KERNEL_1, 0);
+
+#ifdef CONFIG_PM
+void soc_early_init_hook(void)
+{
+	ifx_pm_init();
+}
+#endif