/* * Copyright 2012 Calxeda, Inc. * * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7 * Copyright 2012 Freescale Semiconductor, Inc. * Copyright 2012 Linaro Ltd. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see <http://www.gnu.org/licenses/>. * * Maintainer: Rob Herring <rob.herring@calxeda.com> */ #include <linux/cpuidle.h> #include <linux/cpu_pm.h> #include <linux/init.h> #include <linux/mm.h> #include <linux/platform_device.h> #include <linux/psci.h> #include <asm/cpuidle.h> #include <asm/suspend.h> #include <uapi/linux/psci.h> #define CALXEDA_IDLE_PARAM \ ((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \ (0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \ (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT)) static int calxeda_idle_finish(unsigned long val) { return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume)); } static int calxeda_pwrdown_idle(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index) { cpu_pm_enter(); cpu_suspend(0, calxeda_idle_finish); cpu_pm_exit(); return index; } static struct cpuidle_driver calxeda_idle_driver = { .name = "calxeda_idle", .states = { ARM_CPUIDLE_WFI_STATE, { .name = "PG", .desc = "Power Gate", .exit_latency = 30, .power_usage = 50, .target_residency = 200, .enter = calxeda_pwrdown_idle, }, }, .state_count = 2, }; static int calxeda_cpuidle_probe(struct platform_device *pdev) { return cpuidle_register(&calxeda_idle_driver, NULL); } static struct platform_driver calxeda_cpuidle_plat_driver = { .driver = { .name = "cpuidle-calxeda", }, .probe = calxeda_cpuidle_probe, }; builtin_platform_driver(calxeda_cpuidle_plat_driver);