tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 <linux/psci.h>
29
30#include <asm/cpuidle.h>
31#include <asm/suspend.h>
32
33#include <uapi/linux/psci.h>
34
35#define CALXEDA_IDLE_PARAM \
36 ((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \
37 (0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \
38 (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT))
39
40static int calxeda_idle_finish(unsigned long val)
41{
42 return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume));
43}
44
45static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
46 struct cpuidle_driver *drv,
47 int index)
48{
49 cpu_pm_enter();
50 cpu_suspend(0, calxeda_idle_finish);
51 cpu_pm_exit();
52
53 return index;
54}
55
56static struct cpuidle_driver calxeda_idle_driver = {
57 .name = "calxeda_idle",
58 .states = {
59 ARM_CPUIDLE_WFI_STATE,
60 {
61 .name = "PG",
62 .desc = "Power Gate",
63 .exit_latency = 30,
64 .power_usage = 50,
65 .target_residency = 200,
66 .enter = calxeda_pwrdown_idle,
67 },
68 },
69 .state_count = 2,
70};
71
72static int calxeda_cpuidle_probe(struct platform_device *pdev)
73{
74 return cpuidle_register(&calxeda_idle_driver, NULL);
75}
76
77static struct platform_driver calxeda_cpuidle_plat_driver = {
78 .driver = {
79 .name = "cpuidle-calxeda",
80 },
81 .probe = calxeda_cpuidle_probe,
82};
83builtin_platform_driver(calxeda_cpuidle_plat_driver);