soc: arm: adi: max32: Add power management feature

This commit add power.c file that provides device goes to low power modes

Signed-off-by: Sadik Ozer <sadik.ozer@analog.com>

soc/adi/max32/CMakeLists.txt

@@ -5,6 +5,7 @@ zephyr_include_directories(${ZEPHYR_BASE}/drivers)
 zephyr_include_directories(common)
 zephyr_sources(soc.c)
 
+zephyr_library_sources_ifdef(CONFIG_PM power.c)
 zephyr_linker_sources_ifdef(CONFIG_SOC_FLASH_MAX32 SECTIONS flash.ld)
 if(CONFIG_SOC_MAX78000 OR CONFIG_SOC_MAX78002)
   zephyr_linker_sources(SECTIONS max7800x.ld)

soc/adi/max32/Kconfig

@@ -26,6 +26,7 @@ config SOC_FAMILY_MAX32_M4
 	select CPU_CORTEX_M_HAS_SYSTICK
 	select CPU_HAS_ARM_MPU
 	select CPU_HAS_FPU
+	select HAS_PM
 
 config SOC_MAX32655_M4
 	select MAX32_HAS_SECONDARY_RV32

soc/adi/max32/power.c

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2024 Analog Devices, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/pm/pm.h>
+
+#include <mxc_device.h>
+#include <wrap_max32_lp.h>
+
+#include <zephyr/logging/log.h>
+#define LOG_LEVEL CONFIG_SOC_LOG_LEVEL
+LOG_MODULE_REGISTER(soc);
+
+void pm_state_set(enum pm_state state, uint8_t substate_id)
+{
+	ARG_UNUSED(substate_id);
+
+	/* Set PRIMASK */
+	__disable_irq();
+	/* Set BASEPRI to 0 */
+	irq_unlock(0);
+
+	switch (state) {
+	case PM_STATE_RUNTIME_IDLE:
+		LOG_DBG("entering PM state runtime idle");
+		Wrap_MXC_LP_EnterLowPowerMode();
+		break;
+	case PM_STATE_SUSPEND_TO_IDLE:
+		LOG_DBG("entering PM state suspend to idle");
+		Wrap_MXC_LP_EnterMicroPowerMode();
+		break;
+	case PM_STATE_STANDBY:
+		LOG_DBG("entering PM state standby");
+		Wrap_MXC_LP_EnterStandbyMode();
+		break;
+	case PM_STATE_SOFT_OFF:
+		LOG_DBG("entering PM state powerdown");
+		Wrap_MXC_LP_EnterPowerDownMode();
+		/*Code not reach here */
+	default:
+		LOG_DBG("Unsupported power state %u", state);
+		return;
+	}
+	LOG_DBG("wakeup from sleep mode");
+}
+
+/* Handle SOC specific activity after Low Power Mode Exit */
+void pm_state_exit_post_ops(enum pm_state state, uint8_t substate_id)
+{
+	ARG_UNUSED(substate_id);
+
+	/* Set run mode config after wakeup */
+	switch (state) {
+	case PM_STATE_RUNTIME_IDLE:
+		LOG_DBG("exited PM state runtime idle");
+		break;
+	case PM_STATE_SUSPEND_TO_IDLE:
+		LOG_DBG("exited PM state suspend to idle");
+		break;
+	case PM_STATE_STANDBY:
+		/* For this state wait a little until RTC register being ready
+		 * otherwise seems previous RTC value being read
+		 */
+		k_busy_wait(100);
+		LOG_DBG("exited PM state standby");
+		break;
+	default:
+		break;
+	}
+
+	/* Clear PRIMASK after wakeup */
+	__enable_irq();
+}