soc: silabs: siwx91x: Add siwx91x Power Manager driver

This commit enables the Power Manager driver
support for the siwx91x device.

Signed-off-by: S Mohamed Fiaz <fiaz.mohamed@silabs.com>

dts/arm/silabs/siwg917.dtsi

@@ -24,6 +24,20 @@
 		cpu0: cpu@0 {
 			compatible = "arm,cortex-m4f";
 			reg = <0>;
+			cpu-power-states = <&pstate_ps4_standby &pstate_ps4_sleep>;
+		};
+
+		power-states {
+			pstate_ps4_standby: ps4_standby {
+				compatible = "zephyr,power-state";
+				power-state-name = "runtime-idle";
+			};
+			pstate_ps4_sleep: ps4_sleep {
+				compatible = "zephyr,power-state";
+				power-state-name = "suspend-to-idle";
+				min-residency-us = <100000>;
+				exit-latency-us = <3000>;
+			};
 		};
 	};
 

modules/hal_silabs/wiseconnect/CMakeLists.txt

@@ -3,6 +3,7 @@
 
 set(SISDK_DIR ${ZEPHYR_HAL_SILABS_MODULE_DIR}/simplicity_sdk)
 set(WISECONNECT_DIR ${ZEPHYR_HAL_SILABS_MODULE_DIR}/wiseconnect)
+set(COMMON_DIR ${ZEPHYR_HAL_SILABS_MODULE_DIR}/simplicity_sdk/platform/common)
 
 # Keep these values sync with
 # components/device/silabs/si91x/mcu/core/chip/component/siwg917*.slcc
@@ -23,16 +24,25 @@ zephyr_include_directories(
   ${SISDK_DIR}/platform/common/inc
   ${SISDK_DIR}/platform/common/config
   ${SISDK_DIR}/platform/service/mem_pool/inc
-  ${WISECONNECT_DIR}/components/board/silabs/inc
+  # Wiseconnect do not provide generic RTE_Device_917.h. However, all the boards
+  # share more-or-less the same definitions. So we could take any of them.
+  # In addtion, this file is only required for the compilation, but none the
+  # symbols are normally used by Zephyr (it is required to compile CMSIS API
+  # which is not not used).
+  ${WISECONNECT_DIR}/components/board/silabs/config/brd4342a
   ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/core/config
   ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/core/chip/inc
   ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/core/chip/config
+  ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/core/common/inc
   ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/rom_driver/inc
   ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/peripheral_drivers/inc
   ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/service/clock_manager/inc
+  ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/service/power_manager/inc
+  ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/service/power_manager/config
   ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/systemlevel/inc
   ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/unified_api/inc
   ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/unified_api/config
+  ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/unified_api/config/sl_i2s_config
   ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/unified_peripheral_drivers/inc
   ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/cmsis_driver/config
   ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/cmsis_driver
@@ -141,7 +151,7 @@ endif() # CONFIG_BT_SILABS_SIWX91X
 if(CONFIG_WISECONNECT_NETWORK_STACK)
   zephyr_compile_definitions(
     SLI_SI91X_ENABLE_OS
-    SL_SI91X_SI917_RAM_MEM_CONFIG=1
+    SL_SI91X_SI917_RAM_MEM_CONFIG=2
     SL_WIFI_COMPONENT_INCLUDED # Depite de the name, required for everything
   )
   zephyr_include_directories(
@@ -198,5 +208,49 @@ if(CONFIG_SOC_SILABS_SLEEPTIMER)
   )
 endif() # CONFIG_SOC_SILABS_SLEEPTIMER
 
+if(CONFIG_SOC_SIWX91X_PM_BACKEND_PMGR)
+  zephyr_library_sources(
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/core/common/src/rsi_debug.c
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/core/chip/src/rsi_ps_ram_func.c
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/cmsis_driver/USART.c
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/cmsis_driver/UDMA.c
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/cmsis_driver/SAI.c
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/peripheral_drivers/src/sl_si91x_m4_ps.c
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/peripheral_drivers/src/rsi_usart.c
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/peripheral_drivers/src/rsi_udma_wrapper.c
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/peripheral_drivers/src/rsi_udma.c
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/service/power_manager/src/sl_si91x_power_manager.c
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/service/power_manager/src/sli_si91x_power_manager.c
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/service/clock_manager/src/sli_si91x_clock_manager.c
+    ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/systemlevel/src/rsi_temp_sensor.c
+    ${COMMON_DIR}/src/sl_slist.c
+  )
+  zephyr_include_directories(
+    ${COMMON_DIR}/inc
+  )
+  zephyr_compile_definitions(
+    SL_CODE_COMPONENT_POWER_MANAGER=power_manager
+    SL_SI91X_TICKLESS_MODE
+    SL_SLEEP_TIMER
+    SL_SI91X_SI917_RAM_MEM_CONFIG=2
+    SL_CODE_COMPONENT_CORE=core
+    DEBUG_ENABLE
+    DEBUG_UART
+    SLI_WIRELESS_COMPONENT_PRESENT
+  )
+  zephyr_code_relocate(FILES
+  ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/core/chip/src/rsi_deepsleep_soc.c
+  ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/service/power_manager/src/sl_si91x_power_manager.c
+  ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/service/power_manager/src/sli_si91x_power_manager.c
+  ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/service/sleeptimer/src/sl_sleeptimer_hal_si91x_sysrtc.c
+  ${WISECONNECT_DIR}/components/device/silabs/si91x/mcu/drivers/peripheral_drivers/src/rsi_sysrtc.c
+  ${SISDK_DIR}/platform/service/sleeptimer/src/sl_sleeptimer.c
+  ${WISECONNECT_DIR}/components/device/silabs/si91x/wireless/ahb_interface/src/rsi_hal_mcu_m4_ram.c
+  ${WISECONNECT_DIR}/components/device/silabs/si91x/wireless/ahb_interface/src/rsi_hal_mcu_m4_rom.c
+  ${ZEPHYR_BASE}/drivers/gpio/*.c
+  LOCATION RAM
+  )
+endif() # CONFIG_SOC_SIWX91X_PM_BACKEND_PMGR
+
 zephyr_linker_sources(ROM_SECTIONS linker/code_classification_text.ld)
 zephyr_linker_sources(RAMFUNC_SECTION linker/code_classification_ramfunc.ld)

soc/silabs/silabs_siwx91x/Kconfig

@@ -9,6 +9,7 @@ config SOC_FAMILY_SILABS_SIWX91X
 	select CPU_HAS_ARM_MPU
 	select HAS_SILABS_WISECONNECT
 	select HAS_SEGGER_RTT if ZEPHYR_SEGGER_MODULE
+	select HAS_PM
 
 if SOC_FAMILY_SILABS_SIWX91X
 
@@ -19,6 +20,16 @@ config SOC_SILABS_SLEEPTIMER
 	help
 	  The Sleeptimer HAL module is used for SIWX91X.
 
+config SOC_SIWX91X_PM_BACKEND_PMGR
+	bool
+	select WISECONNECT_NETWORK_STACK
+	select SILABS_SLEEPTIMER_TIMER
+	select SRAM_VECTOR_TABLE
+	select CODE_DATA_RELOCATION_SRAM
+	default y if PM
+	help
+	  Implement PM using sl_power_manager service from Gecko SDK
+
 config SIWX91X_NWP_INIT_PRIORITY
 	int "SiWx91x Network Processor init priority"
 	default 39

soc/silabs/silabs_siwx91x/Kconfig.defconfig

@@ -3,9 +3,6 @@
 
 if SOC_FAMILY_SILABS_SIWX91X
 
-configdefault SILABS_SLEEPTIMER_TIMER
-	default y if PM
-
 configdefault CORTEX_M_SYSTICK
 	default n if SILABS_SLEEPTIMER_TIMER
 

soc/silabs/silabs_siwx91x/siwg917/CMakeLists.txt

@@ -3,5 +3,6 @@
 
 zephyr_sources_ifdef(CONFIG_SOC_SERIES_SIWG917 soc.c)
 zephyr_sources_ifdef(CONFIG_WISECONNECT_NETWORK_STACK nwp.c)
+zephyr_sources_ifdef(CONFIG_SOC_SIWX91X_PM_BACKEND_PMGR soc_siwx91x_power_pmgr.c)
 
 set(SOC_LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld CACHE INTERNAL "")

soc/silabs/silabs_siwx91x/siwg917/nwp.c

@@ -19,6 +19,7 @@
 #ifdef CONFIG_BT_SILABS_SIWX91X
 #include "rsi_ble_common_config.h"
 #endif
+#include "sl_si91x_power_manager.h"
 
 #define AP_MAX_NUM_STA 4
 
@@ -243,6 +244,8 @@ static int siwg917_nwp_init(void)
 {
 	sl_wifi_device_configuration_t network_config;
 	sl_status_t status;
+	__maybe_unused sl_wifi_performance_profile_t performance_profile = {
+		.profile = DEEP_SLEEP_WITH_RAM_RETENTION};
 
 	siwx91x_get_nwp_config(&network_config, WIFI_STA_MODE, false, 0);
 	/* TODO: If sl_net_*_profile() functions will be needed for WiFi then call
@@ -253,6 +256,14 @@ static int siwg917_nwp_init(void)
 		return -EINVAL;
 	}
 
+	if (IS_ENABLED(CONFIG_SOC_SIWX91X_PM_BACKEND_PMGR)) {
+		status = sl_wifi_set_performance_profile(&performance_profile);
+		if (status != SL_STATUS_OK) {
+			return -EINVAL;
+		}
+		/* Remove the previously added PS4 power state requirement */
+		sl_si91x_power_manager_remove_ps_requirement(SL_SI91X_POWER_MANAGER_PS4);
+	}
 	return 0;
 }
 #if defined(CONFIG_MBEDTLS_INIT)

soc/silabs/silabs_siwx91x/siwg917/soc.c

@@ -10,10 +10,28 @@
 #include <zephyr/sw_isr_table.h>
 
 #include "em_device.h"
+#ifdef CONFIG_WISECONNECT_NETWORK_STACK
+#include "sli_siwx917_soc.h"
+#endif
+#include "sl_si91x_power_manager.h"
 
 void soc_early_init_hook(void)
 {
+	__maybe_unused sl_power_peripheral_t peripheral_config = {};
+	__maybe_unused sl_power_ram_retention_config_t ram_configuration = {
+		.configure_ram_banks = false,
+		.m4ss_ram_size_kb = (DT_REG_SIZE(DT_NODELABEL(sram0)) / 1024),
+		.ulpss_ram_size_kb = 4,
+	};
 	SystemInit();
+#if IS_ENABLED(CONFIG_SOC_SIWX91X_PM_BACKEND_PMGR)
+	sli_si91x_platform_init();
+	sl_si91x_power_manager_init();
+	sl_si91x_power_manager_remove_peripheral_requirement(&peripheral_config);
+	sl_si91x_power_manager_configure_ram_retention(&ram_configuration);
+	sl_si91x_power_manager_add_ps_requirement(SL_SI91X_POWER_MANAGER_PS4);
+	sl_si91x_power_manager_set_clock_scaling(SL_SI91X_POWER_MANAGER_PERFORMANCE);
+#endif
 }
 
 /* SiWx917's bootloader requires IRQn 32 to hold payload's entry point address. */

soc/silabs/silabs_siwx91x/siwg917/soc_siwx91x_power_pmgr.c

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2024-2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/logging/log.h>
+#include <zephyr/pm/pm.h>
+#include "sl_si91x_power_manager.h"
+#include "sli_si91x_clock_manager.h"
+#include "sl_rsi_utility.h"
+#include "sl_si91x_m4_ps.h"
+
+LOG_MODULE_REGISTER(siwx91x_pm);
+
+extern uint32_t frontend_switch_control;
+
+/*
+ * Power state map:
+ * PM_STATE_RUNTIME_IDLE: SL_SI91X_POWER_MANAGER_STANDBY (PS4)
+ * PM_STATE_SUSPEND_TO_IDLE: SL_SI91X_POWER_MANAGER_SLEEP (PS4 Sleep)
+ */
+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);
+
+	if (!sl_si91x_power_manager_is_ok_to_sleep()) {
+		/* Device is not ready to sleep; perform necessary actions if required. */
+		goto out;
+	}
+
+	if (state == PM_STATE_RUNTIME_IDLE) {
+		sl_si91x_power_manager_standby();
+	} else {
+		if (sli_si91x_config_clocks_to_mhz_rc() != 0) {
+			LOG_ERR("Failed to configure clocks for sleep mode");
+			goto out;
+		}
+		if (IS_ENABLED(CONFIG_WISECONNECT_NETWORK_STACK)) {
+			if (!(M4_ULP_SLP_STATUS_REG & ULP_MODE_SWITCHED_NPSS)) {
+				if (!sl_si91x_is_device_initialized()) {
+					LOG_ERR("Device is not initialized");
+					goto out;
+				}
+				sli_si91x_xtal_turn_off_request_from_m4_to_TA();
+			}
+		}
+		sl_si91x_power_manager_sleep();
+	}
+
+	if (!(M4_ULP_SLP_STATUS_REG & ULP_MODE_SWITCHED_NPSS)) {
+		if (frontend_switch_control != 0) {
+			sli_si91x_configure_wireless_frontend_controls(frontend_switch_control);
+		}
+
+		sl_si91x_host_clear_sleep_indicator();
+		sli_si91x_m4_ta_wakeup_configurations();
+	}
+out:
+	/* Clear PRIMASK */
+	__enable_irq();
+}
+
+void pm_state_exit_post_ops(enum pm_state state, uint8_t substate_id)
+{
+	ARG_UNUSED(state);
+	ARG_UNUSED(substate_id);
+}