cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cpuidle-mvebu-v7.c (3370B)

      1/*
      2 * Marvell Armada 370, 38x and 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 MVEBU_V7_FLAG_DEEP_IDLE	0x10000
     25
     26static int (*mvebu_v7_cpu_suspend)(int);
     27
     28static 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	ret = mvebu_v7_cpu_suspend(deepidle);
     40	cpu_pm_exit();
     41
     42	if (ret)
     43		return ret;
     44
     45	return index;
     46}
     47
     48static struct cpuidle_driver armadaxp_idle_driver = {
     49	.name			= "armada_xp_idle",
     50	.states[0]		= ARM_CPUIDLE_WFI_STATE,
     51	.states[1]		= {
     52		.enter			= mvebu_v7_enter_idle,
     53		.exit_latency		= 100,
     54		.power_usage		= 50,
     55		.target_residency	= 1000,
     56		.name			= "MV CPU IDLE",
     57		.desc			= "CPU power down",
     58	},
     59	.states[2]		= {
     60		.enter			= mvebu_v7_enter_idle,
     61		.exit_latency		= 1000,
     62		.power_usage		= 5,
     63		.target_residency	= 10000,
     64		.flags			= MVEBU_V7_FLAG_DEEP_IDLE,
     65		.name			= "MV CPU DEEP IDLE",
     66		.desc			= "CPU and L2 Fabric power down",
     67	},
     68	.state_count = 3,
     69};
     70
     71static struct cpuidle_driver armada370_idle_driver = {
     72	.name			= "armada_370_idle",
     73	.states[0]		= ARM_CPUIDLE_WFI_STATE,
     74	.states[1]		= {
     75		.enter			= mvebu_v7_enter_idle,
     76		.exit_latency		= 100,
     77		.power_usage		= 5,
     78		.target_residency	= 1000,
     79		.flags			= MVEBU_V7_FLAG_DEEP_IDLE,
     80		.name			= "Deep Idle",
     81		.desc			= "CPU and L2 Fabric power down",
     82	},
     83	.state_count = 2,
     84};
     85
     86static struct cpuidle_driver armada38x_idle_driver = {
     87	.name			= "armada_38x_idle",
     88	.states[0]		= ARM_CPUIDLE_WFI_STATE,
     89	.states[1]		= {
     90		.enter			= mvebu_v7_enter_idle,
     91		.exit_latency		= 10,
     92		.power_usage		= 5,
     93		.target_residency	= 100,
     94		.name			= "Idle",
     95		.desc			= "CPU and SCU power down",
     96	},
     97	.state_count = 2,
     98};
     99
    100static int mvebu_v7_cpuidle_probe(struct platform_device *pdev)
    101{
    102	const struct platform_device_id *id = pdev->id_entry;
    103
    104	if (!id)
    105		return -EINVAL;
    106
    107	mvebu_v7_cpu_suspend = pdev->dev.platform_data;
    108
    109	return cpuidle_register((struct cpuidle_driver *)id->driver_data, NULL);
    110}
    111
    112static const struct platform_device_id mvebu_cpuidle_ids[] = {
    113	{
    114		.name = "cpuidle-armada-xp",
    115		.driver_data = (unsigned long)&armadaxp_idle_driver,
    116	}, {
    117		.name = "cpuidle-armada-370",
    118		.driver_data = (unsigned long)&armada370_idle_driver,
    119	}, {
    120		.name = "cpuidle-armada-38x",
    121		.driver_data = (unsigned long)&armada38x_idle_driver,
    122	},
    123	{}
    124};
    125
    126static struct platform_driver mvebu_cpuidle_driver = {
    127	.probe = mvebu_v7_cpuidle_probe,
    128	.driver = {
    129		.name = "cpuidle-mbevu",
    130		.suppress_bind_attrs = true,
    131	},
    132	.id_table = mvebu_cpuidle_ids,
    133};
    134
    135builtin_platform_driver(mvebu_cpuidle_driver);
    136
    137MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
    138MODULE_DESCRIPTION("Marvell EBU v7 cpuidle driver");
    139MODULE_LICENSE("GPL");