drivers/cpuidle/cpuidle-mvebu-v7.c

   1 /*
   2  * Marvell Armada 370, 38x and XP SoC cpuidle driver
   3  *
   4  * Copyright (C) 2014 Marvell
   5  *
   6  * Nadav Haklai <nadavh@marvell.com>
   7  * Gregory CLEMENT <gregory.clement@free-electrons.com>
   8  *
   9  * This file is licensed under the terms of the GNU General Public
  10  * License version 2.  This program is licensed "as is" without any
  11  * warranty of any kind, whether express or implied.
  12  *
  13  * Maintainer: Gregory CLEMENT <gregory.clement@free-electrons.com>
  14  */
  15
  16 #include <linux/cpu_pm.h>
  17 #include <linux/cpuidle.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/suspend.h>
  21 #include <linux/platform_device.h>
  22 #include <asm/cpuidle.h>
  23
  24 #define MVEBU_V7_FLAG_DEEP_IDLE 0x10000
  25
  26 static int (*mvebu_v7_cpu_suspend)(int);
  27
  28 static int mvebu_v7_enter_idle(struct cpuidle_device *dev,
  29                                 struct cpuidle_driver *drv,
  30                                 int index)
  31 {
  32         int ret;
  33         bool deepidle = false;
  34         cpu_pm_enter();
  35
  36         if (drv->states[index].flags & MVEBU_V7_FLAG_DEEP_IDLE)
  37                 deepidle = true;
  38
  39         ret = mvebu_v7_cpu_suspend(deepidle);
  40         if (ret)
  41                 return ret;
  42
  43         cpu_pm_exit();
  44
  45         return index;
  46 }
  47
  48 static struct cpuidle_driver armadaxp_idle_driver = {
  49         .name                   = "armada_xp_idle",
  50         .states[0]              = ARM_CPUIDLE_WFI_STATE,
  51         .states[1]              = {
  52                 .enter                  = mvebu_v7_enter_idle,
  53                 .exit_latency           = 10,
  54                 .power_usage            = 50,
  55                 .target_residency       = 100,
  56                 .flags                  = CPUIDLE_FLAG_TIME_VALID,
  57                 .name                   = "MV CPU IDLE",
  58                 .desc                   = "CPU power down",
  59         },
  60         .states[2]              = {
  61                 .enter                  = mvebu_v7_enter_idle,
  62                 .exit_latency           = 100,
  63                 .power_usage            = 5,
  64                 .target_residency       = 1000,
  65                 .flags                  = CPUIDLE_FLAG_TIME_VALID |
  66                                                 MVEBU_V7_FLAG_DEEP_IDLE,
  67                 .name                   = "MV CPU DEEP IDLE",
  68                 .desc                   = "CPU and L2 Fabric power down",
  69         },
  70         .state_count = 3,
  71 };
  72
  73 static struct cpuidle_driver armada370_idle_driver = {
  74         .name                   = "armada_370_idle",
  75         .states[0]              = ARM_CPUIDLE_WFI_STATE,
  76         .states[1]              = {
  77                 .enter                  = mvebu_v7_enter_idle,
  78                 .exit_latency           = 100,
  79                 .power_usage            = 5,
  80                 .target_residency       = 1000,
  81                 .flags                  = (CPUIDLE_FLAG_TIME_VALID |
  82                                            MVEBU_V7_FLAG_DEEP_IDLE),
  83                 .name                   = "Deep Idle",
  84                 .desc                   = "CPU and L2 Fabric power down",
  85         },
  86         .state_count = 2,
  87 };
  88
  89 static struct cpuidle_driver armada38x_idle_driver = {
  90         .name                   = "armada_38x_idle",
  91         .states[0]              = ARM_CPUIDLE_WFI_STATE,
  92         .states[1]              = {
  93                 .enter                  = mvebu_v7_enter_idle,
  94                 .exit_latency           = 10,
  95                 .power_usage            = 5,
  96                 .target_residency       = 100,
  97                 .flags                  = CPUIDLE_FLAG_TIME_VALID,
  98                 .name                   = "Idle",
  99                 .desc                   = "CPU and SCU power down",
 100         },
 101         .state_count = 2,
 102 };
 103
 104 static int mvebu_v7_cpuidle_probe(struct platform_device *pdev)
 105 {
 106         mvebu_v7_cpu_suspend = pdev->dev.platform_data;
 107
 108         if (!strcmp(pdev->dev.driver->name, "cpuidle-armada-xp"))
 109                 return cpuidle_register(&armadaxp_idle_driver, NULL);
 110         else if (!strcmp(pdev->dev.driver->name, "cpuidle-armada-370"))
 111                 return cpuidle_register(&armada370_idle_driver, NULL);
 112         else if (!strcmp(pdev->dev.driver->name, "cpuidle-armada-38x"))
 113                 return cpuidle_register(&armada38x_idle_driver, NULL);
 114         else
 115                 return -EINVAL;
 116 }
 117
 118 static struct platform_driver armadaxp_cpuidle_plat_driver = {
 119         .driver = {
 120                 .name = "cpuidle-armada-xp",
 121                 .owner = THIS_MODULE,
 122         },
 123         .probe = mvebu_v7_cpuidle_probe,
 124 };
 125
 126 module_platform_driver(armadaxp_cpuidle_plat_driver);
 127
 128 static struct platform_driver armada370_cpuidle_plat_driver = {
 129         .driver = {
 130                 .name = "cpuidle-armada-370",
 131                 .owner = THIS_MODULE,
 132         },
 133         .probe = mvebu_v7_cpuidle_probe,
 134 };
 135
 136 module_platform_driver(armada370_cpuidle_plat_driver);
 137
 138 static struct platform_driver armada38x_cpuidle_plat_driver = {
 139         .driver = {
 140                 .name = "cpuidle-armada-38x",
 141                 .owner = THIS_MODULE,
 142         },
 143         .probe = mvebu_v7_cpuidle_probe,
 144 };
 145
 146 module_platform_driver(armada38x_cpuidle_plat_driver);
 147
 148 MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
 149 MODULE_DESCRIPTION("Marvell EBU v7 cpuidle driver");
 150 MODULE_LICENSE("GPL");