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/*
* Copyright (C) 2012 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/cpuidle.h>
#include <linux/module.h>
#include <asm/cpuidle.h>
#include <soc/imx/cpuidle.h>
#include "common.h"
#include "cpuidle.h"
#include "hardware.h"
static atomic_t master = ATOMIC_INIT(0);
static DEFINE_SPINLOCK(master_lock);
static int imx6q_enter_wait(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
if (atomic_inc_return(&master) == num_online_cpus()) {
/*
* With this lock, we prevent other cpu to exit and enter
* this function again and become the master.
*/
if (!spin_trylock(&master_lock))
goto idle;
imx6_set_lpm(WAIT_UNCLOCKED);
cpu_do_idle();
imx6_set_lpm(WAIT_CLOCKED);
spin_unlock(&master_lock);
goto done;
}
idle:
cpu_do_idle();
done:
atomic_dec(&master);
return index;
}
static struct cpuidle_driver imx6q_cpuidle_driver = {
.name = "imx6q_cpuidle",
.owner = THIS_MODULE,
.states = {
/* WFI */
ARM_CPUIDLE_WFI_STATE,
/* WAIT */
{
.exit_latency = 50,
.target_residency = 75,
.flags = CPUIDLE_FLAG_TIMER_STOP,
.enter = imx6q_enter_wait,
.name = "WAIT",
.desc = "Clock off",
},
},
.state_count = 2,
.safe_state_index = 0,
};
/*
* i.MX6 Q/DL has an erratum (ERR006687) that prevents the FEC from waking the
* CPUs when they are in wait(unclocked) state. As the hardware workaround isn't
* applicable to all boards, disable the deeper idle state when the workaround
* isn't present and the FEC is in use.
*/
void imx6q_cpuidle_fec_irqs_used(void)
{
imx6q_cpuidle_driver.states[1].disabled = true;
}
EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_used);
void imx6q_cpuidle_fec_irqs_unused(void)
{
imx6q_cpuidle_driver.states[1].disabled = false;
}
EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_unused);
int __init imx6q_cpuidle_init(void)
{
/* Set INT_MEM_CLK_LPM bit to get a reliable WAIT mode support */
imx6_set_int_mem_clk_lpm(true);
return cpuidle_register(&imx6q_cpuidle_driver, NULL);
}
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