150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
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/*
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* CPU idle driver for Tegra CPUs
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*
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* Copyright (c) 2010-2012, NVIDIA Corporation.
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* Copyright (c) 2011 Google, Inc.
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* Author: Colin Cross <ccross@android.com>
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* Gary King <gking@nvidia.com>
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*
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* Rework for 3.3 by Peter De Schrijver <pdeschrijver@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/clk/tegra.h>
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#include <linux/clockchips.h>
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#include <linux/cpuidle.h>
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#include <linux/cpu_pm.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/cpuidle.h>
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#include <asm/proc-fns.h>
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#include <asm/smp_plat.h>
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#include <asm/suspend.h>
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#include "pm.h"
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#include "sleep.h"
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#ifdef CONFIG_PM_SLEEP
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static int tegra30_idle_lp2(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index);
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#endif
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static struct cpuidle_driver tegra_idle_driver = {
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.name = "tegra_idle",
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.owner = THIS_MODULE,
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#ifdef CONFIG_PM_SLEEP
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.state_count = 2,
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#else
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.state_count = 1,
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#endif
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.states = {
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[0] = ARM_CPUIDLE_WFI_STATE_PWR(600),
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#ifdef CONFIG_PM_SLEEP
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[1] = {
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.enter = tegra30_idle_lp2,
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.exit_latency = 2000,
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.target_residency = 2200,
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.power_usage = 0,
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.flags = CPUIDLE_FLAG_TIME_VALID,
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.name = "powered-down",
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.desc = "CPU power gated",
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},
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#endif
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},
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};
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#ifdef CONFIG_PM_SLEEP
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static bool tegra30_cpu_cluster_power_down(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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/* All CPUs entering LP2 is not working.
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* Don't let CPU0 enter LP2 when any secondary CPU is online.
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*/
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if (num_online_cpus() > 1 || !tegra_cpu_rail_off_ready()) {
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cpu_do_idle();
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return false;
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}
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clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu);
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tegra_idle_lp2_last();
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clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu);
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return true;
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}
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#ifdef CONFIG_SMP
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static bool tegra30_cpu_core_power_down(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu);
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smp_wmb();
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cpu_suspend(0, tegra30_sleep_cpu_secondary_finish);
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clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &dev->cpu);
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return true;
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}
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#else
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static inline bool tegra30_cpu_core_power_down(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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return true;
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}
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#endif
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static int tegra30_idle_lp2(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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bool entered_lp2 = false;
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bool last_cpu;
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local_fiq_disable();
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last_cpu = tegra_set_cpu_in_lp2();
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cpu_pm_enter();
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if (dev->cpu == 0) {
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if (last_cpu)
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entered_lp2 = tegra30_cpu_cluster_power_down(dev, drv,
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index);
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else
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cpu_do_idle();
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} else {
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entered_lp2 = tegra30_cpu_core_power_down(dev, drv, index);
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}
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cpu_pm_exit();
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tegra_clear_cpu_in_lp2();
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local_fiq_enable();
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smp_rmb();
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return (entered_lp2) ? index : 0;
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}
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#endif
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int __init tegra30_cpuidle_init(void)
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{
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return cpuidle_register(&tegra_idle_driver, NULL);
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}
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