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 __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");