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