summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap2/pm44xx.c
blob: dc8b1ef9f84c4c4f11496f1a05b549f63f054291 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/*
 * OMAP4 Power Management Routines
 *
 * Copyright (C) 2010 Texas Instruments, Inc.
 * Rajendra Nayak <rnayak@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/pm.h>
#include <linux/suspend.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/slab.h>

#include <plat/powerdomain.h>
#include <mach/omap4-common.h>

struct power_state {
	struct powerdomain *pwrdm;
	u32 next_state;
#ifdef CONFIG_SUSPEND
	u32 saved_state;
#endif
	struct list_head node;
};

static LIST_HEAD(pwrst_list);

#ifdef CONFIG_SUSPEND
static int omap4_pm_prepare(void)
{
	disable_hlt();
	return 0;
}

static int omap4_pm_suspend(void)
{
	do_wfi();
	return 0;
}

static int omap4_pm_enter(suspend_state_t suspend_state)
{
	int ret = 0;

	switch (suspend_state) {
	case PM_SUSPEND_STANDBY:
	case PM_SUSPEND_MEM:
		ret = omap4_pm_suspend();
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static void omap4_pm_finish(void)
{
	enable_hlt();
	return;
}

static int omap4_pm_begin(suspend_state_t state)
{
	return 0;
}

static void omap4_pm_end(void)
{
	return;
}

static const struct platform_suspend_ops omap_pm_ops = {
	.begin		= omap4_pm_begin,
	.end		= omap4_pm_end,
	.prepare	= omap4_pm_prepare,
	.enter		= omap4_pm_enter,
	.finish		= omap4_pm_finish,
	.valid		= suspend_valid_only_mem,
};
#endif /* CONFIG_SUSPEND */

static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
{
	struct power_state *pwrst;

	if (!pwrdm->pwrsts)
		return 0;

	pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
	if (!pwrst)
		return -ENOMEM;
	pwrst->pwrdm = pwrdm;
	pwrst->next_state = PWRDM_POWER_ON;
	list_add(&pwrst->node, &pwrst_list);

	return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state);
}

/**
 * omap4_pm_init - Init routine for OMAP4 PM
 *
 * Initializes all powerdomain and clockdomain target states
 * and all PRCM settings.
 */
static int __init omap4_pm_init(void)
{
	int ret;

	if (!cpu_is_omap44xx())
		return -ENODEV;

	pr_err("Power Management for TI OMAP4.\n");

#ifdef CONFIG_PM
	ret = pwrdm_for_each(pwrdms_setup, NULL);
	if (ret) {
		pr_err("Failed to setup powerdomains\n");
		goto err2;
	}
#endif

#ifdef CONFIG_SUSPEND
	suspend_set_ops(&omap_pm_ops);
#endif /* CONFIG_SUSPEND */

err2:
	return ret;
}
late_initcall(omap4_pm_init);
OpenPOWER on IntegriCloud