85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* Copyright (C) 2012 Freescale Semiconductor, Inc.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/context_tracking.h>
|
||
|
|
#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 int num_idle_cpus = 0;
|
||
|
|
static DEFINE_RAW_SPINLOCK(cpuidle_lock);
|
||
|
|
|
||
|
|
static int imx6q_enter_wait(struct cpuidle_device *dev,
|
||
|
|
struct cpuidle_driver *drv, int index)
|
||
|
|
{
|
||
|
|
raw_spin_lock(&cpuidle_lock);
|
||
|
|
if (++num_idle_cpus == num_online_cpus())
|
||
|
|
imx6_set_lpm(WAIT_UNCLOCKED);
|
||
|
|
raw_spin_unlock(&cpuidle_lock);
|
||
|
|
|
||
|
|
ct_idle_enter();
|
||
|
|
cpu_do_idle();
|
||
|
|
ct_idle_exit();
|
||
|
|
|
||
|
|
raw_spin_lock(&cpuidle_lock);
|
||
|
|
if (num_idle_cpus-- == num_online_cpus())
|
||
|
|
imx6_set_lpm(WAIT_CLOCKED);
|
||
|
|
raw_spin_unlock(&cpuidle_lock);
|
||
|
|
|
||
|
|
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 | CPUIDLE_FLAG_RCU_IDLE,
|
||
|
|
.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)
|
||
|
|
{
|
||
|
|
cpuidle_driver_state_disabled(&imx6q_cpuidle_driver, 1, true);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_used);
|
||
|
|
|
||
|
|
void imx6q_cpuidle_fec_irqs_unused(void)
|
||
|
|
{
|
||
|
|
cpuidle_driver_state_disabled(&imx6q_cpuidle_driver, 1, 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);
|
||
|
|
}
|