linux/drivers/cpuidle/cpuidle-calxeda.c
<<
>>
Prefs
   1/*
   2 * Copyright 2012 Calxeda, Inc.
   3 *
   4 * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7
   5 * Copyright 2012 Freescale Semiconductor, Inc.
   6 * Copyright 2012 Linaro Ltd.
   7 *
   8 * This program is free software; you can redistribute it and/or modify it
   9 * under the terms and conditions of the GNU General Public License,
  10 * version 2, as published by the Free Software Foundation.
  11 *
  12 * This program is distributed in the hope it will be useful, but WITHOUT
  13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15 * more details.
  16 *
  17 * You should have received a copy of the GNU General Public License along with
  18 * this program.  If not, see <http://www.gnu.org/licenses/>.
  19 *
  20 * Maintainer: Rob Herring <rob.herring@calxeda.com>
  21 */
  22
  23#include <linux/cpuidle.h>
  24#include <linux/cpu_pm.h>
  25#include <linux/init.h>
  26#include <linux/mm.h>
  27#include <linux/platform_device.h>
  28#include <asm/cpuidle.h>
  29#include <asm/suspend.h>
  30#include <asm/psci.h>
  31
  32static int calxeda_idle_finish(unsigned long val)
  33{
  34        const struct psci_power_state ps = {
  35                .type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
  36        };
  37        return psci_ops.cpu_suspend(ps, __pa(cpu_resume));
  38}
  39
  40static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
  41                                struct cpuidle_driver *drv,
  42                                int index)
  43{
  44        cpu_pm_enter();
  45        cpu_suspend(0, calxeda_idle_finish);
  46        cpu_pm_exit();
  47
  48        return index;
  49}
  50
  51static struct cpuidle_driver calxeda_idle_driver = {
  52        .name = "calxeda_idle",
  53        .states = {
  54                ARM_CPUIDLE_WFI_STATE,
  55                {
  56                        .name = "PG",
  57                        .desc = "Power Gate",
  58                        .exit_latency = 30,
  59                        .power_usage = 50,
  60                        .target_residency = 200,
  61                        .enter = calxeda_pwrdown_idle,
  62                },
  63        },
  64        .state_count = 2,
  65};
  66
  67static int calxeda_cpuidle_probe(struct platform_device *pdev)
  68{
  69        return cpuidle_register(&calxeda_idle_driver, NULL);
  70}
  71
  72static struct platform_driver calxeda_cpuidle_plat_driver = {
  73        .driver = {
  74                .name = "cpuidle-calxeda",
  75        },
  76        .probe = calxeda_cpuidle_probe,
  77};
  78
  79module_platform_driver(calxeda_cpuidle_plat_driver);
  80
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.