94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*
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* Marvell Armada 370 and Armada 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 ARMADA_370_XP_MAX_STATES 3
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#define ARMADA_370_XP_FLAG_DEEP_IDLE 0x10000
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static int (*armada_370_xp_cpu_suspend)(int);
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static int armada_370_xp_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 & ARMADA_370_XP_FLAG_DEEP_IDLE)
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deepidle = true;
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ret = armada_370_xp_cpu_suspend(deepidle);
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if (ret)
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return ret;
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cpu_pm_exit();
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return index;
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}
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static struct cpuidle_driver armada_370_xp_idle_driver = {
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.name = "armada_370_xp_idle",
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.states[0] = ARM_CPUIDLE_WFI_STATE,
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.states[1] = {
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.enter = armada_370_xp_enter_idle,
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.exit_latency = 10,
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.power_usage = 50,
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.target_residency = 100,
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.flags = CPUIDLE_FLAG_TIME_VALID,
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.name = "Idle",
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.desc = "CPU power down",
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},
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.states[2] = {
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.enter = armada_370_xp_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 = CPUIDLE_FLAG_TIME_VALID |
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ARMADA_370_XP_FLAG_DEEP_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 = ARMADA_370_XP_MAX_STATES,
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};
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static int armada_370_xp_cpuidle_probe(struct platform_device *pdev)
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{
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armada_370_xp_cpu_suspend = (void *)(pdev->dev.platform_data);
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return cpuidle_register(&armada_370_xp_idle_driver, NULL);
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}
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static struct platform_driver armada_370_xp_cpuidle_plat_driver = {
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.driver = {
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.name = "cpuidle-armada-370-xp",
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.owner = THIS_MODULE,
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},
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.probe = armada_370_xp_cpuidle_probe,
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};
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module_platform_driver(armada_370_xp_cpuidle_plat_driver);
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MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
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MODULE_DESCRIPTION("Armada 370/XP cpu idle driver");
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MODULE_LICENSE("GPL");
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