| /* |
| * 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 <asm/cpuidle.h> |
| #include <asm/suspend.h> |
| #include <asm/psci.h> |
| |
| static int calxeda_idle_finish(unsigned long val) |
| { |
| const struct psci_power_state ps = { |
| .type = PSCI_POWER_STATE_TYPE_POWER_DOWN, |
| }; |
| return psci_ops.cpu_suspend(ps, __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", |
| .flags = CPUIDLE_FLAG_TIME_VALID, |
| .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, |
| }; |
| |
| module_platform_driver(calxeda_cpuidle_plat_driver); |