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/*
* Copyright (c) 2016 Jean-Paul Etienne <fractalclone@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <toolchain.h>
#include <irq.h>
#include <soc.h>
#include <logging/kernel_event_logger.h>
static ALWAYS_INLINE void pulpino_idle(unsigned int key)
{
#ifdef CONFIG_KERNEL_EVENT_LOGGER_SLEEP
_sys_k_event_logger_enter_sleep();
#endif
/* unlock interrupts */
irq_unlock(key);
/* Put CPU core to sleep via SCR register */
PULP_SCR = 0x01;
/* Wait for interrupt */
SOC_WFI;
}
/**
*
* @brief Power save idle routine
*
* This function will be called by the kernel idle loop or possibly within
* an implementation of _sys_power_save_idle in the microkernel when the
* '_sys_power_save_flag' variable is non-zero.
*
* @return N/A
*/
void k_cpu_idle(void)
{
pulpino_idle(SOC_MSTATUS_IEN);
}
/**
*
* @brief Atomically re-enable interrupts and enter low power mode
*
* INTERNAL
* The requirements for k_cpu_atomic_idle() are as follows:
* 1) The enablement of interrupts and entering a low-power mode needs to be
* atomic, i.e. there should be no period of time where interrupts are
* enabled before the processor enters a low-power mode. See the comments
* in k_lifo_get(), for example, of the race condition that
* occurs if this requirement is not met.
*
* 2) After waking up from the low-power mode, the interrupt lockout state
* must be restored as indicated in the 'imask' input parameter.
*
* @return N/A
*/
void k_cpu_atomic_idle(unsigned int key)
{
pulpino_idle(key);
}
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