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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 <linux/psci.h>
 29 
 30 #include <asm/cpuidle.h>
 31 #include <asm/suspend.h>
 32 
 33 #include <uapi/linux/psci.h>
 34 
 35 #define CALXEDA_IDLE_PARAM \
 36         ((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \
 37          (0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \
 38          (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT))
 39 
 40 static int calxeda_idle_finish(unsigned long val)
 41 {
 42         return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume));
 43 }
 44 
 45 static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
 46                                 struct cpuidle_driver *drv,
 47                                 int index)
 48 {
 49         cpu_pm_enter();
 50         cpu_suspend(0, calxeda_idle_finish);
 51         cpu_pm_exit();
 52 
 53         return index;
 54 }
 55 
 56 static struct cpuidle_driver calxeda_idle_driver = {
 57         .name = "calxeda_idle",
 58         .states = {
 59                 ARM_CPUIDLE_WFI_STATE,
 60                 {
 61                         .name = "PG",
 62                         .desc = "Power Gate",
 63                         .exit_latency = 30,
 64                         .power_usage = 50,
 65                         .target_residency = 200,
 66                         .enter = calxeda_pwrdown_idle,
 67                 },
 68         },
 69         .state_count = 2,
 70 };
 71 
 72 static int calxeda_cpuidle_probe(struct platform_device *pdev)
 73 {
 74         return cpuidle_register(&calxeda_idle_driver, NULL);
 75 }
 76 
 77 static struct platform_driver calxeda_cpuidle_plat_driver = {
 78         .driver = {
 79                 .name = "cpuidle-calxeda",
 80         },
 81         .probe = calxeda_cpuidle_probe,
 82 };
 83 builtin_platform_driver(calxeda_cpuidle_plat_driver);
 84 

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