145 lines · c
1/*2 * Marvell Armada 370, 38x and XP SoC cpuidle driver3 *4 * Copyright (C) 2014 Marvell5 *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 Public10 * License version 2. This program is licensed "as is" without any11 * 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 0x1000025 26static int (*mvebu_v7_cpu_suspend)(int);27 28static __cpuidle 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 ct_cpuidle_enter();40 ret = mvebu_v7_cpu_suspend(deepidle);41 ct_cpuidle_exit();42 43 cpu_pm_exit();44 45 if (ret)46 return ret;47 48 return index;49}50 51static struct cpuidle_driver armadaxp_idle_driver = {52 .name = "armada_xp_idle",53 .states[0] = ARM_CPUIDLE_WFI_STATE,54 .states[1] = {55 .enter = mvebu_v7_enter_idle,56 .exit_latency = 100,57 .power_usage = 50,58 .target_residency = 1000,59 .flags = CPUIDLE_FLAG_RCU_IDLE,60 .name = "MV CPU IDLE",61 .desc = "CPU power down",62 },63 .states[2] = {64 .enter = mvebu_v7_enter_idle,65 .exit_latency = 1000,66 .power_usage = 5,67 .target_residency = 10000,68 .flags = MVEBU_V7_FLAG_DEEP_IDLE | CPUIDLE_FLAG_RCU_IDLE,69 .name = "MV CPU DEEP IDLE",70 .desc = "CPU and L2 Fabric power down",71 },72 .state_count = 3,73};74 75static struct cpuidle_driver armada370_idle_driver = {76 .name = "armada_370_idle",77 .states[0] = ARM_CPUIDLE_WFI_STATE,78 .states[1] = {79 .enter = mvebu_v7_enter_idle,80 .exit_latency = 100,81 .power_usage = 5,82 .target_residency = 1000,83 .flags = MVEBU_V7_FLAG_DEEP_IDLE | CPUIDLE_FLAG_RCU_IDLE,84 .name = "Deep Idle",85 .desc = "CPU and L2 Fabric power down",86 },87 .state_count = 2,88};89 90static struct cpuidle_driver armada38x_idle_driver = {91 .name = "armada_38x_idle",92 .states[0] = ARM_CPUIDLE_WFI_STATE,93 .states[1] = {94 .enter = mvebu_v7_enter_idle,95 .exit_latency = 10,96 .power_usage = 5,97 .target_residency = 100,98 .flags = CPUIDLE_FLAG_RCU_IDLE,99 .name = "Idle",100 .desc = "CPU and SCU power down",101 },102 .state_count = 2,103};104 105static int mvebu_v7_cpuidle_probe(struct platform_device *pdev)106{107 const struct platform_device_id *id = pdev->id_entry;108 109 if (!id)110 return -EINVAL;111 112 mvebu_v7_cpu_suspend = pdev->dev.platform_data;113 114 return cpuidle_register((struct cpuidle_driver *)id->driver_data, NULL);115}116 117static const struct platform_device_id mvebu_cpuidle_ids[] = {118 {119 .name = "cpuidle-armada-xp",120 .driver_data = (unsigned long)&armadaxp_idle_driver,121 }, {122 .name = "cpuidle-armada-370",123 .driver_data = (unsigned long)&armada370_idle_driver,124 }, {125 .name = "cpuidle-armada-38x",126 .driver_data = (unsigned long)&armada38x_idle_driver,127 },128 {}129};130 131static struct platform_driver mvebu_cpuidle_driver = {132 .probe = mvebu_v7_cpuidle_probe,133 .driver = {134 .name = "cpuidle-mbevu",135 .suppress_bind_attrs = true,136 },137 .id_table = mvebu_cpuidle_ids,138};139 140builtin_platform_driver(mvebu_cpuidle_driver);141 142MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");143MODULE_DESCRIPTION("Marvell EBU v7 cpuidle driver");144MODULE_LICENSE("GPL");145