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+/*
+ * Copyright (c) 2016 embedded brains GmbH. All rights reserved.
+ *
+ * embedded brains GmbH
+ * Dornierstr. 4
+ * 82178 Puchheim
+ * Germany
+ * <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef LIBBSP_ARM_ATSAM_POWER_H
+#define LIBBSP_ARM_ATSAM_POWER_H
+
+#include <sys/types.h>
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C"{
+#endif /* __cplusplus */
+
+/**
+ * @brief Status of the Low Power Support
+ */
+typedef enum {
+ /**
+ * @brief Used for Initialization of Handlers
+ */
+ ATSAM_POWER_INIT,
+ /**
+ * @brief Used for Switching On of Handlers
+ */
+ ATSAM_POWER_ON,
+ /**
+ * @brief Used for Switching Off of Handlers
+ */
+ ATSAM_POWER_OFF
+} atsam_power_state;
+
+/**
+ * @brief Control structure for power control handling
+ */
+typedef struct atsam_power_control {
+ /**
+ * @brief Data pointer to the handler with its desired state
+ */
+ void (*handler)(
+ const struct atsam_power_control *control,
+ atsam_power_state state
+ );
+ /**
+ * @brief Data chunk that is used by the handler
+ */
+ union {
+ void *arg;
+ struct {
+ uint8_t first;
+ uint8_t last;
+ } peripherals;
+ } data;
+} atsam_power_control;
+
+/**
+ * @brief Performs a power state change according to the state parameter.
+ *
+ * The handlers of the control table are invoked in forward order (invocation
+ * starts with table index zero) for the ATSAM_POWER_INIT and ATSAM_POWER_OFF
+ * states, otherwise the handlers are invoked in reverse order (invocation
+ * starts with the last table index).
+ *
+ * @param controls Table with power controls.
+ * @param n Count of power control table entries.
+ * @param state The desired power state.
+ *
+ * @code
+ * #include <rtems.h>
+ * #include <pthread.h>
+ *
+ * #include <bsp/power.h>
+ *
+ * static atsam_power_data_rtc_driver rtc_data = { .interval = 5 };
+ *
+ * static const atsam_power_control power_controls[] = {
+ * ATSAM_POWER_CLOCK_DRIVER,
+ * ATSAM_POWER_RTC_DRIVER(&rtc_data),
+ * ATSAM_POWER_SLEEP_MODE
+ * };
+ *
+ * static pthread_once_t once = PTHREAD_ONCE_INIT;
+ *
+ * static void init(void)
+ * {
+ * atsam_power_change_state(
+ * &power_controls[0],
+ * RTEMS_ARRAY_SIZE(power_controls),
+ * ATSAM_POWER_INIT
+ * );
+ * }
+ *
+ * void power_init(void)
+ * {
+ * pthread_once(&once, init);
+ * }
+ *
+ * void low_power(void)
+ * {
+ * atsam_power_change_state(
+ * &power_controls[0],
+ * RTEMS_ARRAY_SIZE(power_controls),
+ * ATSAM_POWER_OFF
+ * );
+ * atsam_power_change_state(
+ * &power_controls[0],
+ * RTEMS_ARRAY_SIZE(power_controls),
+ * ATSAM_POWER_ON
+ * );
+ * }
+ * @end
+ */
+void atsam_power_change_state(
+ const atsam_power_control *controls,
+ size_t n,
+ atsam_power_state state
+);
+
+/**
+ * @brief Power handler for a set of peripherals according to the specified
+ * peripheral indices.
+ *
+ * For the power off state, the peripherals are enabled in the PMC.
+ *
+ * For the power on state, the peripherals are disabled in the Power Management
+ * Controller (PMC).
+ *
+ * @see ATSAM_POWER_PERIPHERAL().
+ */
+void atsam_power_handler_peripheral(
+ const atsam_power_control *controls,
+ atsam_power_state state
+);
+
+/**
+ * @brief Power handler for the clock driver.
+ *
+ * For the power off state, the system tick is disabled.
+ *
+ * For the power on state, the system tick is enabled. In case no clock driver
+ * is used by the application, then this may lead to a spurious interrupt
+ * resulting in a fatal error.
+ *
+ * @see ATSAM_POWER_CLOCK_DRIVER().
+ */
+void atsam_power_handler_clock_driver(
+ const atsam_power_control *controls,
+ atsam_power_state state
+);
+
+/**
+ * @brief Power handler for the RTC driver.
+ *
+ * This handler installs an interrupt handler during power support initialization.
+ *
+ * For the power off state, the RTC alarm interrupt is set up according to the
+ * interval of the corresponding handler data.
+ *
+ * For the power on state, the RTC alarm interrupt is disabled.
+ *
+ * @see ATSAM_POWER_RTC_DRIVER().
+ */
+void atsam_power_handler_rtc_driver(
+ const atsam_power_control *controls,
+ atsam_power_state state
+);
+
+/**
+ * @brief Power handler to enter the processor sleep mode.
+ *
+ * For the power off state, the processor is set into the sleep mode and issues
+ * a wait for interrupt instruction.
+ *
+ * @see ATSAM_POWER_SLEEP_MODE().
+ */
+void atsam_power_handler_sleep_mode(
+ const atsam_power_control *controls,
+ atsam_power_state state
+);
+
+/**
+ * @brief Initializer for a peripheral power support.
+ *
+ * @param f The first peripheral index.
+ * @param l The last peripheral index.
+ */
+#define ATSAM_POWER_PERIPHERAL(f, l) \
+ { \
+ .handler = atsam_power_handler_peripheral, \
+ .data = { .peripherals = { .first = f, .last = l } } \
+ }
+
+#define ATSAM_POWER_HANDLER(h, a) \
+ { \
+ .handler = h, \
+ .data = { .arg = a } \
+ }
+
+#define ATSAM_POWER_CLOCK_DRIVER \
+ { .handler = atsam_power_handler_clock_driver }
+
+#define ATSAM_POWER_SLEEP_MODE \
+ { .handler = atsam_power_handler_sleep_mode }
+
+/**
+ * @brief Data for RTC driver power support.
+ *
+ * @see ATSAM_POWER_RTC_DRIVER().
+ */
+typedef struct {
+ /**
+ * @brief Interval in seconds for which the power off mode should be active.
+ */
+ uint8_t interval;
+} atsam_power_data_rtc_driver;
+
+/**
+ * @brief Initializer for RTC driver power support.
+ *
+ * @param a Pointer to RTC driver power data.
+ *
+ * @see atsam_power_data_rtc_driver.
+ */
+#define ATSAM_POWER_RTC_DRIVER(a) \
+ { \
+ .handler = atsam_power_handler_rtc_driver, \
+ .data = { .arg = a } \
+ }
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* LIBBSP_ARM_ATSAM_POWER_H */