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/*
* OMAP4 CPU idle Routines
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Santosh Shilimkar <santosh.shilimkar@ti.com>
* Rajendra Nayak <rnayak@ti.com>
*
* 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/sched.h>
#include <linux/cpuidle.h>
#include <linux/cpu_pm.h>
#include <linux/export.h>
#include <linux/clockchips.h>
#include <asm/proc-fns.h>
#include "common.h"
#include "pm.h"
#include "prm.h"
#ifdef CONFIG_CPU_IDLE
/* Machine specific information */
struct omap4_idle_statedata {
u32 cpu_state;
u32 mpu_logic_state;
u32 mpu_state;
};
static struct omap4_idle_statedata omap4_idle_data[] = {
{
.cpu_state = PWRDM_POWER_ON,
.mpu_state = PWRDM_POWER_ON,
.mpu_logic_state = PWRDM_POWER_RET,
},
{
.cpu_state = PWRDM_POWER_OFF,
.mpu_state = PWRDM_POWER_RET,
.mpu_logic_state = PWRDM_POWER_RET,
},
{
.cpu_state = PWRDM_POWER_OFF,
.mpu_state = PWRDM_POWER_RET,
.mpu_logic_state = PWRDM_POWER_OFF,
},
};
static struct powerdomain *mpu_pd, *cpu0_pd, *cpu1_pd;
/**
* omap4_enter_idle - Programs OMAP4 to enter the specified state
* @dev: cpuidle device
* @drv: cpuidle driver
* @index: the index of state to be entered
*
* Called from the CPUidle framework to program the device to the
* specified low power state selected by the governor.
* Returns the amount of time spent in the low power state.
*/
static int omap4_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
struct omap4_idle_statedata *cx = &omap4_idle_data[index];
u32 cpu1_state;
int cpu_id = smp_processor_id();
local_fiq_disable();
/*
* CPU0 has to stay ON (i.e in C1) until CPU1 is OFF state.
* This is necessary to honour hardware recommondation
* of triggeing all the possible low power modes once CPU1 is
* out of coherency and in OFF mode.
* Update dev->last_state so that governor stats reflects right
* data.
*/
cpu1_state = pwrdm_read_pwrst(cpu1_pd);
if (cpu1_state != PWRDM_POWER_OFF) {
index = drv->safe_state_index;
cx = &omap4_idle_data[index];
}
if (index > 0)
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &cpu_id);
/*
* Call idle CPU PM enter notifier chain so that
* VFP and per CPU interrupt context is saved.
*/
if (cx->cpu_state == PWRDM_POWER_OFF)
cpu_pm_enter();
pwrdm_set_logic_retst(mpu_pd, cx->mpu_logic_state);
omap_set_pwrdm_state(mpu_pd, cx->mpu_state);
/*
* Call idle CPU cluster PM enter notifier chain
* to save GIC and wakeupgen context.
*/
if ((cx->mpu_state == PWRDM_POWER_RET) &&
(cx->mpu_logic_state == PWRDM_POWER_OFF))
cpu_cluster_pm_enter();
omap4_enter_lowpower(dev->cpu, cx->cpu_state);
/*
* Call idle CPU PM exit notifier chain to restore
* VFP and per CPU IRQ context. Only CPU0 state is
* considered since CPU1 is managed by CPU hotplug.
*/
if (pwrdm_read_prev_pwrst(cpu0_pd) == PWRDM_POWER_OFF)
cpu_pm_exit();
/*
* Call idle CPU cluster PM exit notifier chain
* to restore GIC and wakeupgen context.
*/
if (omap4_mpuss_read_prev_context_state())
cpu_cluster_pm_exit();
if (index > 0)
clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &cpu_id);
local_fiq_enable();
return index;
}
DEFINE_PER_CPU(struct cpuidle_device, omap4_idle_dev);
struct cpuidle_driver omap4_idle_driver = {
.name = "omap4_idle",
.owner = THIS_MODULE,
.en_core_tk_irqen = 1,
.states = {
{
/* C1 - CPU0 ON + CPU1 ON + MPU ON */
.exit_latency = 2 + 2,
.target_residency = 5,
.flags = CPUIDLE_FLAG_TIME_VALID,
.enter = omap4_enter_idle,
.name = "C1",
.desc = "MPUSS ON"
},
{
/* C2 - CPU0 OFF + CPU1 OFF + MPU CSWR */
.exit_latency = 328 + 440,
.target_residency = 960,
.flags = CPUIDLE_FLAG_TIME_VALID,
.enter = omap4_enter_idle,
.name = "C2",
.desc = "MPUSS CSWR",
},
{
/* C3 - CPU0 OFF + CPU1 OFF + MPU OSWR */
.exit_latency = 460 + 518,
.target_residency = 1100,
.flags = CPUIDLE_FLAG_TIME_VALID,
.enter = omap4_enter_idle,
.name = "C3",
.desc = "MPUSS OSWR",
},
},
.state_count = ARRAY_SIZE(omap4_idle_data),
.safe_state_index = 0,
};
/**
* omap4_idle_init - Init routine for OMAP4 idle
*
* Registers the OMAP4 specific cpuidle driver to the cpuidle
* framework with the valid set of states.
*/
int __init omap4_idle_init(void)
{
struct cpuidle_device *dev;
unsigned int cpu_id = 0;
mpu_pd = pwrdm_lookup("mpu_pwrdm");
cpu0_pd = pwrdm_lookup("cpu0_pwrdm");
cpu1_pd = pwrdm_lookup("cpu1_pwrdm");
if ((!mpu_pd) || (!cpu0_pd) || (!cpu1_pd))
return -ENODEV;
dev = &per_cpu(omap4_idle_dev, cpu_id);
dev->cpu = cpu_id;
cpuidle_register_driver(&omap4_idle_driver);
if (cpuidle_register_device(dev)) {
pr_err("%s: CPUidle register device failed\n", __func__);
return -EIO;
}
return 0;
}
#else
int __init omap4_idle_init(void)
{
return 0;
}
#endif /* CONFIG_CPU_IDLE */
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