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338f2aadca
Attempt to invoke the prepare_idle() and do_idle() firmware calls to power down a CPU so an underlying firmware gets informed of the idle operation and performs it by itself if designed in such a way. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Stephen Warren <swarren@nvidia.com>
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
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* Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope 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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/cpuidle.h>
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#include <linux/cpu_pm.h>
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#include <linux/clockchips.h>
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#include <asm/firmware.h>
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#include <asm/cpuidle.h>
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#include <asm/suspend.h>
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#include <asm/smp_plat.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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#define TEGRA114_MAX_STATES 2
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#else
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#define TEGRA114_MAX_STATES 1
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#endif
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#ifdef CONFIG_PM_SLEEP
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static int tegra114_idle_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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local_fiq_disable();
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tegra_set_cpu_in_lp2();
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cpu_pm_enter();
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clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, &dev->cpu);
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call_firmware_op(prepare_idle);
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/* Do suspend by ourselves if the firmware does not implement it */
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if (call_firmware_op(do_idle) == -ENOSYS)
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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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cpu_pm_exit();
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tegra_clear_cpu_in_lp2();
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local_fiq_enable();
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return index;
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}
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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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.state_count = TEGRA114_MAX_STATES,
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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 = tegra114_idle_power_down,
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.exit_latency = 500,
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.target_residency = 1000,
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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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int __init tegra114_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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