1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright 2012 Calxeda, Inc.
 4 *
 5 * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7
 6 * Copyright 2012 Freescale Semiconductor, Inc.
 7 * Copyright 2012 Linaro Ltd.
 8 *
 
 
 
 
 
 
 
 
 
 
 
 
 9 * Maintainer: Rob Herring <rob.herring@calxeda.com>
10 */
11
12#include <linux/cpuidle.h>
13#include <linux/cpu_pm.h>
14#include <linux/init.h>
15#include <linux/mm.h>
16#include <linux/platform_device.h>
17#include <linux/psci.h>
18
19#include <asm/cpuidle.h>
20#include <asm/suspend.h>
21
22#include <uapi/linux/psci.h>
23
24#define CALXEDA_IDLE_PARAM \
25	((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \
26	 (0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \
27	 (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT))
28
29static int calxeda_idle_finish(unsigned long val)
30{
31	return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume));
 
 
 
32}
33
34static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
35				struct cpuidle_driver *drv,
36				int index)
37{
38	cpu_pm_enter();
39	cpu_suspend(0, calxeda_idle_finish);
40	cpu_pm_exit();
41
42	return index;
43}
44
45static struct cpuidle_driver calxeda_idle_driver = {
46	.name = "calxeda_idle",
47	.states = {
48		ARM_CPUIDLE_WFI_STATE,
49		{
50			.name = "PG",
51			.desc = "Power Gate",
 
52			.exit_latency = 30,
53			.power_usage = 50,
54			.target_residency = 200,
55			.enter = calxeda_pwrdown_idle,
56		},
57	},
58	.state_count = 2,
59};
60
61static int calxeda_cpuidle_probe(struct platform_device *pdev)
62{
63	return cpuidle_register(&calxeda_idle_driver, NULL);
64}
65
66static struct platform_driver calxeda_cpuidle_plat_driver = {
67        .driver = {
68                .name = "cpuidle-calxeda",
 
69        },
70        .probe = calxeda_cpuidle_probe,
71};
72builtin_platform_driver(calxeda_cpuidle_plat_driver);
 

 
 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			.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
68static int calxeda_cpuidle_probe(struct platform_device *pdev)
69{
70	return cpuidle_register(&calxeda_idle_driver, NULL);
71}
72
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);