1/*
2 * Copyright 2012 Calxeda, Inc.
3 *
4 * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7
5 * Copyright 2012 Freescale Semiconductor, Inc.
6 * Copyright 2012 Linaro Ltd.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program.  If not, see <http://www.gnu.org/licenses/>.
19 *
20 * Maintainer: Rob Herring <rob.herring@calxeda.com>
21 */
22
23#include <linux/cpuidle.h>
24#include <linux/cpu_pm.h>
25#include <linux/init.h>
26#include <linux/mm.h>
27#include <linux/platform_device.h>
28#include <asm/cpuidle.h>
29#include <asm/suspend.h>
30#include <asm/psci.h>
31
32static int calxeda_idle_finish(unsigned long val)
33{
34	const struct psci_power_state ps = {
35		.type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
36	};
37	return psci_ops.cpu_suspend(ps, __pa(cpu_resume));
38}
39
40static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
41				struct cpuidle_driver *drv,
42				int index)
43{
44	cpu_pm_enter();
45	cpu_suspend(0, calxeda_idle_finish);
46	cpu_pm_exit();
47
48	return index;
49}
50
51static struct cpuidle_driver calxeda_idle_driver = {
52	.name = "calxeda_idle",
53	.states = {
54		ARM_CPUIDLE_WFI_STATE,
55		{
56			.name = "PG",
57			.desc = "Power Gate",
58			.exit_latency = 30,
59			.power_usage = 50,
60			.target_residency = 200,
61			.enter = calxeda_pwrdown_idle,
62		},
63	},
64	.state_count = 2,
65};
66
67static int calxeda_cpuidle_probe(struct platform_device *pdev)
68{
69	return cpuidle_register(&calxeda_idle_driver, NULL);
70}
71
72static struct platform_driver calxeda_cpuidle_plat_driver = {
73        .driver = {
74                .name = "cpuidle-calxeda",
75        },
76        .probe = calxeda_cpuidle_probe,
77};
78
79module_platform_driver(calxeda_cpuidle_plat_driver);
80