84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*
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* Copyright 2012 Calxeda, Inc.
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*
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* Based on arch/arm/plat-mxc/cpuidle.c: #v3.7
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* Copyright 2012 Freescale Semiconductor, Inc.
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* Copyright 2012 Linaro Ltd.
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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 along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Maintainer: Rob Herring <rob.herring@calxeda.com>
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*/
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#include <linux/cpuidle.h>
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#include <linux/cpu_pm.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/platform_device.h>
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#include <linux/psci.h>
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#include <asm/cpuidle.h>
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#include <asm/suspend.h>
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#include <uapi/linux/psci.h>
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#define CALXEDA_IDLE_PARAM \
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((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \
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(0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \
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(PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT))
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static int calxeda_idle_finish(unsigned long val)
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{
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return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume));
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}
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static int calxeda_pwrdown_idle(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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cpu_pm_enter();
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cpu_suspend(0, calxeda_idle_finish);
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cpu_pm_exit();
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return index;
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}
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static struct cpuidle_driver calxeda_idle_driver = {
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.name = "calxeda_idle",
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.states = {
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ARM_CPUIDLE_WFI_STATE,
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{
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.name = "PG",
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.desc = "Power Gate",
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.exit_latency = 30,
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.power_usage = 50,
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.target_residency = 200,
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.enter = calxeda_pwrdown_idle,
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},
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},
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.state_count = 2,
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};
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static int calxeda_cpuidle_probe(struct platform_device *pdev)
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{
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return cpuidle_register(&calxeda_idle_driver, NULL);
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}
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static struct platform_driver calxeda_cpuidle_plat_driver = {
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.driver = {
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.name = "cpuidle-calxeda",
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},
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.probe = calxeda_cpuidle_probe,
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};
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builtin_platform_driver(calxeda_cpuidle_plat_driver);
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