soc/arm/nordic_nrf: implementation of request and fetch the MCUboot mode

Implemented SoC specific function needed for posting the bootloader
mode by the application and fetching it by the MCUboot.

Signed-off-by: Andrzej Puzdrowski <[email protected]>API for request MCUboot mode

Author: nvlsianpu

soc/arm/nordic_nrf/nrf52/soc.c

@@ -47,6 +47,22 @@ extern void z_arm_nmi_init(void);
 #define LOG_LEVEL CONFIG_SOC_LOG_LEVEL
 LOG_MODULE_REGISTER(soc);
 
+int soc_mcuboot_mode_set(uint8_t mode)
+{
+	nrf_power_gpregret2_set(NRF_POWER, mode);
+
+	return 0;
+}
+
+uint8_t soc_mcuboot_mode_get(void)
+{
+	uint8_t mode = nrf_power_gpregret2_get(NRF_POWER);
+
+	nrf_power_gpregret2_set(NRF_POWER, 0);
+
+	return mode;
+}
+
 /* Overrides the weak ARM implementation:
    Set general purpose retention register and reboot */
 void sys_arch_reboot(int type)

soc/arm/nordic_nrf/nrf53/soc.c

@@ -25,11 +25,13 @@
 #include <hal/nrf_gpio.h>
 #include <hal/nrf_oscillators.h>
 #include <hal/nrf_regulators.h>
+#include <hal/nrf_power.h>
 #elif defined(CONFIG_SOC_NRF5340_CPUNET)
 #include <hal/nrf_nvmc.h>
 #endif
 #include <soc_secure.h>
 
+
 #define PIN_XL1 0
 #define PIN_XL2 1
 
@@ -66,6 +68,24 @@ extern void z_arm_nmi_init(void);
 #define LOG_LEVEL CONFIG_SOC_LOG_LEVEL
 LOG_MODULE_REGISTER(soc);
 
+#if defined(CONFIG_SOC_NRF5340_CPUAPP)
+int soc_mcuboot_mode_set(uint8_t mode)
+{
+	nrf_power_gpregret2_set(NRF_POWER, mode);
+
+	return 0;
+}
+
+uint8_t soc_mcuboot_mode_get(void)
+{
+	uint8_t mode = nrf_power_gpregret2_get(NRF_POWER);
+
+	nrf_power_gpregret2_set(NRF_POWER, 0);
+
+	return mode;
+}
+#endif
+
 static int nordicsemi_nrf53_init(const struct device *arg)
 {
 	uint32_t key;

soc/arm/nordic_nrf/nrf91/soc.c

@@ -17,6 +17,7 @@
 #include <arch/arm/aarch32/cortex_m/cmsis.h>
 #include <soc/nrfx_coredep.h>
 #include <logging/log.h>
+#include <hal/nrf_power.h>
 
 #ifdef CONFIG_RUNTIME_NMI
 extern void z_arm_nmi_init(void);
@@ -34,6 +35,22 @@ extern void z_arm_nmi_init(void);
 #define LOG_LEVEL CONFIG_SOC_LOG_LEVEL
 LOG_MODULE_REGISTER(soc);
 
+int soc_mcuboot_mode_set(uint8_t mode)
+{
+	nrf_power_gpregret_ext_set(NRF_POWER, 1, mode);
+
+	return 0;
+}
+
+uint8_t soc_mcuboot_mode_set(void)
+{
+	uint8_t mode = nrf_power_gpregret_ext_get(NRF_POWER, 1);
+
+	nrf_power_gpregret_ext_set(NRF_POWER, 1, 0);
+
+	return mode;
+}
+
 static int nordicsemi_nrf91_init(const struct device *arg)
 {
 	uint32_t key;