253 lines
6.2 KiB
C
253 lines
6.2 KiB
C
/*
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* Copyright (c) 2015 Intel Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <device.h>
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#include <drivers/ioapic.h>
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#include <init.h>
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#include <kernel.h>
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#include <rtc.h>
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#include <power.h>
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#include <soc.h>
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#include "qm_isr.h"
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#include "qm_rtc.h"
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struct rtc_data {
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#ifdef CONFIG_RTC_QMSI_API_REENTRANCY
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struct k_sem sem;
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#endif
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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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uint32_t device_power_state;
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#endif
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};
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#define RTC_HAS_CONTEXT_DATA \
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(CONFIG_RTC_QMSI_API_REENTRANCY || CONFIG_DEVICE_POWER_MANAGEMENT)
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#if RTC_HAS_CONTEXT_DATA
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static struct rtc_data rtc_context;
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#define RTC_CONTEXT (&rtc_context)
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#else
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#define RTC_CONTEXT (NULL)
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#endif /* RTC_HAS_CONTEXT_DATA */
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#ifdef CONFIG_RTC_QMSI_API_REENTRANCY
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static const int reentrancy_protection = 1;
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#define RP_GET(dev) (&((struct rtc_data *)(dev->driver_data))->sem)
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#else
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static const int reentrancy_protection;
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#define RP_GET(dev) (NULL)
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#endif
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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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static void rtc_qmsi_set_power_state(struct device *dev, uint32_t power_state)
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{
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struct rtc_data *context = dev->driver_data;
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context->device_power_state = power_state;
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}
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static uint32_t rtc_qmsi_get_power_state(struct device *dev)
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{
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struct rtc_data *context = dev->driver_data;
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return context->device_power_state;
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}
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#else
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#define rtc_qmsi_set_power_state(...)
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#endif
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static void rtc_reentrancy_init(struct device *dev)
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{
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if (!reentrancy_protection) {
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return;
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}
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k_sem_init(RP_GET(dev), 0, UINT_MAX);
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k_sem_give(RP_GET(dev));
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}
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static void rtc_critical_region_start(struct device *dev)
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{
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if (!reentrancy_protection) {
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return;
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}
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k_sem_take(RP_GET(dev), K_FOREVER);
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}
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static void rtc_critical_region_end(struct device *dev)
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{
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if (!reentrancy_protection) {
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return;
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}
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k_sem_give(RP_GET(dev));
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}
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static void rtc_qmsi_enable(struct device *dev)
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{
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clk_periph_enable(CLK_PERIPH_RTC_REGISTER | CLK_PERIPH_CLK);
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}
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static void rtc_qmsi_disable(struct device *dev)
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{
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clk_periph_disable(CLK_PERIPH_RTC_REGISTER);
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}
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static int rtc_qmsi_set_config(struct device *dev, struct rtc_config *cfg)
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{
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qm_rtc_config_t qm_cfg;
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int result = 0;
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qm_cfg.init_val = cfg->init_val;
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qm_cfg.alarm_en = cfg->alarm_enable;
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qm_cfg.alarm_val = cfg->alarm_val;
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/* Casting callback type due different input parameter from QMSI
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* compared aganst the Zephyr callback from void cb(struct device *dev)
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* to void cb(void *)
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*/
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qm_cfg.callback = (void *) cfg->cb_fn;
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qm_cfg.callback_data = dev;
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/* Set prescaler value. Ideally, the divider should come from struct
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* rtc_config instead. It's safe to use RTC_DIVIDER here for now since
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* values defined by clk_rtc_div and by QMSI's clk_rtc_div_t match for
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* both D2000 and SE.
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*/
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qm_cfg.prescaler = (clk_rtc_div_t)RTC_DIVIDER;
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rtc_critical_region_start(dev);
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if (qm_rtc_set_config(QM_RTC_0, &qm_cfg)) {
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result = -EIO;
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}
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rtc_critical_region_end(dev);
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k_busy_wait(60);
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return result;
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}
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static int rtc_qmsi_set_alarm(struct device *dev, const uint32_t alarm_val)
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{
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return qm_rtc_set_alarm(QM_RTC_0, alarm_val);
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}
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static uint32_t rtc_qmsi_read(struct device *dev)
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{
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return QM_RTC[QM_RTC_0].rtc_ccvr;
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}
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static uint32_t rtc_qmsi_get_pending_int(struct device *dev)
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{
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return QM_RTC[QM_RTC_0].rtc_stat;
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}
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static const struct rtc_driver_api api = {
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.enable = rtc_qmsi_enable,
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.disable = rtc_qmsi_disable,
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.read = rtc_qmsi_read,
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.set_config = rtc_qmsi_set_config,
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.set_alarm = rtc_qmsi_set_alarm,
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.get_pending_int = rtc_qmsi_get_pending_int,
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};
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static int rtc_qmsi_init(struct device *dev)
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{
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rtc_reentrancy_init(dev);
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IRQ_CONNECT(IRQ_GET_NUMBER(QM_IRQ_RTC_0_INT), CONFIG_RTC_0_IRQ_PRI,
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qm_rtc_0_isr, NULL,
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IOAPIC_EDGE | IOAPIC_HIGH);
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/* Unmask RTC interrupt */
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irq_enable(IRQ_GET_NUMBER(QM_IRQ_RTC_0_INT));
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/* Route watchdog interrupt to the current core */
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QM_IR_UNMASK_INTERRUPTS(QM_INTERRUPT_ROUTER->rtc_0_int_mask);
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rtc_qmsi_set_power_state(dev, DEVICE_PM_ACTIVE_STATE);
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return 0;
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}
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#ifdef CONFIG_DEVICE_POWER_MANAGEMENT
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#ifdef CONFIG_SYS_POWER_DEEP_SLEEP
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static int rtc_suspend_device(struct device *dev)
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{
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rtc_qmsi_set_power_state(dev, DEVICE_PM_SUSPEND_STATE);
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return 0;
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}
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static int rtc_resume_device(struct device *dev)
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{
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uint32_t int_rtc_mask;
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/* The interrupt router registers are sticky and retain their
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* values across warm resets, so we don't need to save them.
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* But for wake capable peripherals, if their interrupts are
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* configured to be edge sensitive, the wake event will be lost
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* by the time the interrupt controller is reconfigured, while
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* the interrupt is still pending. By masking and unmasking again
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* the corresponding routing register, the interrupt is forwared
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* to the core and the ISR will be serviced as expected.
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*/
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int_rtc_mask = QM_INTERRUPT_ROUTER->rtc_0_int_mask;
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QM_INTERRUPT_ROUTER->rtc_0_int_mask = 0xFFFFFFFF;
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QM_INTERRUPT_ROUTER->rtc_0_int_mask = int_rtc_mask;
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rtc_qmsi_set_power_state(dev, DEVICE_PM_ACTIVE_STATE);
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return 0;
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}
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#endif
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/*
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* Implements the driver control management functionality
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* the *context may include IN data or/and OUT data
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*/
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static int rtc_qmsi_device_ctrl(struct device *dev, uint32_t ctrl_command,
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void *context)
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{
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if (ctrl_command == DEVICE_PM_SET_POWER_STATE) {
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#ifdef CONFIG_SYS_POWER_DEEP_SLEEP
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if (*((uint32_t *)context) == DEVICE_PM_SUSPEND_STATE) {
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return rtc_suspend_device(dev);
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} else if (*((uint32_t *)context) == DEVICE_PM_ACTIVE_STATE) {
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return rtc_resume_device(dev);
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}
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#endif
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} else if (ctrl_command == DEVICE_PM_GET_POWER_STATE) {
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*((uint32_t *)context) = rtc_qmsi_get_power_state(dev);
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return 0;
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}
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return 0;
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}
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#endif
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DEVICE_DEFINE(rtc, CONFIG_RTC_0_NAME, &rtc_qmsi_init, rtc_qmsi_device_ctrl,
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RTC_CONTEXT, NULL, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE,
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&api);
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