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Linux/drivers/cpuidle/cpuidle-calxeda.c

  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 
 32 static 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 
 40 static 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 
 51 static 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                         .flags = CPUIDLE_FLAG_TIME_VALID,
 59                         .exit_latency = 30,
 60                         .power_usage = 50,
 61                         .target_residency = 200,
 62                         .enter = calxeda_pwrdown_idle,
 63                 },
 64         },
 65         .state_count = 2,
 66 };
 67 
 68 static int calxeda_cpuidle_probe(struct platform_device *pdev)
 69 {
 70         return cpuidle_register(&calxeda_idle_driver, NULL);
 71 }
 72 
 73 static struct platform_driver calxeda_cpuidle_plat_driver = {
 74         .driver = {
 75                 .name = "cpuidle-calxeda",
 76                 .owner = THIS_MODULE,
 77         },
 78         .probe = calxeda_cpuidle_probe,
 79 };
 80 
 81 module_platform_driver(calxeda_cpuidle_plat_driver);
 82 

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