blob: 6e51114057d0963605ef1dfc80b231946e1b88f7 [file] [log] [blame]
Rob Herringbe6a98d2012-10-12 12:45:34 -05001/*
2 * Copyright 2012 Calxeda, Inc.
3 *
Daniel Lezcanoa8e39c32013-04-26 11:05:44 +00004 * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7
Rob Herringbe6a98d2012-10-12 12:45:34 -05005 * 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/>.
Daniel Lezcanoa8e39c32013-04-26 11:05:44 +000019 *
20 * Maintainer: Rob Herring <rob.herring@calxeda.com>
Rob Herringbe6a98d2012-10-12 12:45:34 -050021 */
22
23#include <linux/cpuidle.h>
Rob Herring34a5eeb2013-02-26 16:16:53 -060024#include <linux/cpu_pm.h>
Rob Herringbe6a98d2012-10-12 12:45:34 -050025#include <linux/init.h>
Rob Herringa4101462013-02-26 16:05:46 -060026#include <linux/mm.h>
Daniel Lezcano60a66e32013-09-27 12:47:45 +020027#include <linux/platform_device.h>
Rob Herringbe6a98d2012-10-12 12:45:34 -050028#include <asm/cpuidle.h>
Rob Herringbe6a98d2012-10-12 12:45:34 -050029#include <asm/suspend.h>
Rob Herringa4101462013-02-26 16:05:46 -060030#include <asm/psci.h>
Rob Herringbe6a98d2012-10-12 12:45:34 -050031
32static int calxeda_idle_finish(unsigned long val)
33{
Rob Herringa4101462013-02-26 16:05:46 -060034 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));
Rob Herringbe6a98d2012-10-12 12:45:34 -050038}
39
40static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
41 struct cpuidle_driver *drv,
42 int index)
43{
Rob Herring34a5eeb2013-02-26 16:16:53 -060044 cpu_pm_enter();
Rob Herringbe6a98d2012-10-12 12:45:34 -050045 cpu_suspend(0, calxeda_idle_finish);
Rob Herring34a5eeb2013-02-26 16:16:53 -060046 cpu_pm_exit();
47
Rob Herringbe6a98d2012-10-12 12:45:34 -050048 return index;
49}
50
Rob Herringbe6a98d2012-10-12 12:45:34 -050051static struct cpuidle_driver calxeda_idle_driver = {
52 .name = "calxeda_idle",
Rob Herringbe6a98d2012-10-12 12:45:34 -050053 .states = {
54 ARM_CPUIDLE_WFI_STATE,
55 {
56 .name = "PG",
57 .desc = "Power Gate",
58 .flags = CPUIDLE_FLAG_TIME_VALID,
59 .exit_latency = 30,
60 .power_usage = 50,
61 .target_residency = 200,
62 .enter = calxeda_pwrdown_idle,
63 },
64 },
65 .state_count = 2,
66};
67
Andre Przywara57815322013-12-13 21:49:19 +010068static int calxeda_cpuidle_probe(struct platform_device *pdev)
Rob Herringbe6a98d2012-10-12 12:45:34 -050069{
Daniel Lezcano0b210d92013-04-23 08:54:42 +000070 return cpuidle_register(&calxeda_idle_driver, NULL);
Rob Herringbe6a98d2012-10-12 12:45:34 -050071}
Daniel Lezcano60a66e32013-09-27 12:47:45 +020072
73static struct platform_driver calxeda_cpuidle_plat_driver = {
74 .driver = {
75 .name = "cpuidle-calxeda",
76 .owner = THIS_MODULE,
77 },
78 .probe = calxeda_cpuidle_probe,
79};
80
81module_platform_driver(calxeda_cpuidle_plat_driver);