drivers/cpuidle/cpuidle-armada-370-xp.c

   1 /*
   2  * Marvell Armada 370 and Armada 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 ARMADA_370_XP_MAX_STATES        3
  25 #define ARMADA_370_XP_FLAG_DEEP_IDLE    0x10000
  26
  27 static int (*armada_370_xp_cpu_suspend)(int);
  28
  29 static int armada_370_xp_enter_idle(struct cpuidle_device *dev,
  30                                 struct cpuidle_driver *drv,
  31                                 int index)
  32 {
  33         int ret;
  34         bool deepidle = false;
  35         cpu_pm_enter();
  36
  37         if (drv->states[index].flags & ARMADA_370_XP_FLAG_DEEP_IDLE)
  38                 deepidle = true;
  39
  40         ret = armada_370_xp_cpu_suspend(deepidle);
  41         if (ret)
  42                 return ret;
  43
  44         cpu_pm_exit();
  45
  46         return index;
  47 }
  48
  49 static struct cpuidle_driver armada_370_xp_idle_driver = {
  50         .name                   = "armada_370_xp_idle",
  51         .states[0]              = ARM_CPUIDLE_WFI_STATE,
  52         .states[1]              = {
  53                 .enter                  = armada_370_xp_enter_idle,
  54                 .exit_latency           = 10,
  55                 .power_usage            = 50,
  56                 .target_residency       = 100,
  57                 .flags                  = CPUIDLE_FLAG_TIME_VALID,
  58                 .name                   = "Idle",
  59                 .desc                   = "CPU power down",
  60         },
  61         .states[2]              = {
  62                 .enter                  = armada_370_xp_enter_idle,
  63                 .exit_latency           = 100,
  64                 .power_usage            = 5,
  65                 .target_residency       = 1000,
  66                 .flags                  = CPUIDLE_FLAG_TIME_VALID |
  67                                                 ARMADA_370_XP_FLAG_DEEP_IDLE,
  68                 .name                   = "Deep idle",
  69                 .desc                   = "CPU and L2 Fabric power down",
  70         },
  71         .state_count = ARMADA_370_XP_MAX_STATES,
  72 };
  73
  74 static int armada_370_xp_cpuidle_probe(struct platform_device *pdev)
  75 {
  76
  77         armada_370_xp_cpu_suspend = (void *)(pdev->dev.platform_data);
  78         return cpuidle_register(&armada_370_xp_idle_driver, NULL);
  79 }
  80
  81 static struct platform_driver armada_370_xp_cpuidle_plat_driver = {
  82         .driver = {
  83                 .name = "cpuidle-armada-370-xp",
  84                 .owner = THIS_MODULE,
  85         },
  86         .probe = armada_370_xp_cpuidle_probe,
  87 };
  88
  89 module_platform_driver(armada_370_xp_cpuidle_plat_driver);
  90
  91 MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
  92 MODULE_DESCRIPTION("Armada 370/XP cpu idle driver");
  93 MODULE_LICENSE("GPL");