/* * Marvell Armada 370, 38x and XP SoC cpuidle driver * * Copyright (C) 2014 Marvell * * Nadav Haklai <nadavh@marvell.com> * Gregory CLEMENT <gregory.clement@free-electrons.com> * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. * * Maintainer: Gregory CLEMENT <gregory.clement@free-electrons.com> */ #include <linux/cpu_pm.h> #include <linux/cpuidle.h> #include <linux/module.h> #include <linux/of.h> #include <linux/suspend.h> #include <linux/platform_device.h> #include <asm/cpuidle.h> #define MVEBU_V7_FLAG_DEEP_IDLE 0x10000 static int (*mvebu_v7_cpu_suspend)(int); static int mvebu_v7_enter_idle(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index) { int ret; bool deepidle = false; cpu_pm_enter(); if (drv->states[index].flags & MVEBU_V7_FLAG_DEEP_IDLE) deepidle = true; ret = mvebu_v7_cpu_suspend(deepidle); cpu_pm_exit(); if (ret) return ret; return index; } static struct cpuidle_driver armadaxp_idle_driver = { .name = "armada_xp_idle", .states[0] = ARM_CPUIDLE_WFI_STATE, .states[1] = { .enter = mvebu_v7_enter_idle, .exit_latency = 100, .power_usage = 50, .target_residency = 1000, .name = "MV CPU IDLE", .desc = "CPU power down", }, .states[2] = { .enter = mvebu_v7_enter_idle, .exit_latency = 1000, .power_usage = 5, .target_residency = 10000, .flags = MVEBU_V7_FLAG_DEEP_IDLE, .name = "MV CPU DEEP IDLE", .desc = "CPU and L2 Fabric power down", }, .state_count = 3, }; static struct cpuidle_driver armada370_idle_driver = { .name = "armada_370_idle", .states[0] = ARM_CPUIDLE_WFI_STATE, .states[1] = { .enter = mvebu_v7_enter_idle, .exit_latency = 100, .power_usage = 5, .target_residency = 1000, .flags = MVEBU_V7_FLAG_DEEP_IDLE, .name = "Deep Idle", .desc = "CPU and L2 Fabric power down", }, .state_count = 2, }; static struct cpuidle_driver armada38x_idle_driver = { .name = "armada_38x_idle", .states[0] = ARM_CPUIDLE_WFI_STATE, .states[1] = { .enter = mvebu_v7_enter_idle, .exit_latency = 10, .power_usage = 5, .target_residency = 100, .name = "Idle", .desc = "CPU and SCU power down", }, .state_count = 2, }; static int mvebu_v7_cpuidle_probe(struct platform_device *pdev) { const struct platform_device_id *id = pdev->id_entry; if (!id) return -EINVAL; mvebu_v7_cpu_suspend = pdev->dev.platform_data; return cpuidle_register((struct cpuidle_driver *)id->driver_data, NULL); } static const struct platform_device_id mvebu_cpuidle_ids[] = { { .name = "cpuidle-armada-xp", .driver_data = (unsigned long)&armadaxp_idle_driver, }, { .name = "cpuidle-armada-370", .driver_data = (unsigned long)&armada370_idle_driver, }, { .name = "cpuidle-armada-38x", .driver_data = (unsigned long)&armada38x_idle_driver, }, {} }; static struct platform_driver mvebu_cpuidle_driver = { .probe = mvebu_v7_cpuidle_probe, .driver = { .name = "cpuidle-mbevu", .suppress_bind_attrs = true, }, .id_table = mvebu_cpuidle_ids, }; builtin_platform_driver(mvebu_cpuidle_driver); MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>"); MODULE_DESCRIPTION("Marvell EBU v7 cpuidle driver"); MODULE_LICENSE("GPL");