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Rajendra Nayak5643aeb2010-08-02 13:18:18 +03001/*
2 * OMAP4 Power Management Routines
3 *
4 * Copyright (C) 2010 Texas Instruments, Inc.
5 * Rajendra Nayak <rnayak@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/pm.h>
13#include <linux/suspend.h>
14#include <linux/module.h>
15#include <linux/list.h>
16#include <linux/err.h>
17#include <linux/slab.h>
18
Paul Walmsley72e06d02010-12-21 21:05:16 -070019#include "powerdomain.h"
Rajendra Nayak5643aeb2010-08-02 13:18:18 +030020#include <mach/omap4-common.h>
21
22struct power_state {
23 struct powerdomain *pwrdm;
24 u32 next_state;
25#ifdef CONFIG_SUSPEND
26 u32 saved_state;
27#endif
28 struct list_head node;
29};
30
31static LIST_HEAD(pwrst_list);
32
33#ifdef CONFIG_SUSPEND
Rajendra Nayak5643aeb2010-08-02 13:18:18 +030034static int omap4_pm_suspend(void)
35{
36 do_wfi();
37 return 0;
38}
39
40static int omap4_pm_enter(suspend_state_t suspend_state)
41{
42 int ret = 0;
43
44 switch (suspend_state) {
45 case PM_SUSPEND_STANDBY:
46 case PM_SUSPEND_MEM:
47 ret = omap4_pm_suspend();
48 break;
49 default:
50 ret = -EINVAL;
51 }
52
53 return ret;
54}
55
Rajendra Nayak5643aeb2010-08-02 13:18:18 +030056static int omap4_pm_begin(suspend_state_t state)
57{
Jean Pihetc1663812010-12-09 18:39:58 +010058 disable_hlt();
Rajendra Nayak5643aeb2010-08-02 13:18:18 +030059 return 0;
60}
61
62static void omap4_pm_end(void)
63{
Jean Pihetc1663812010-12-09 18:39:58 +010064 enable_hlt();
Rajendra Nayak5643aeb2010-08-02 13:18:18 +030065 return;
66}
67
Lionel Debroux2f55ac02010-11-16 14:14:02 +010068static const struct platform_suspend_ops omap_pm_ops = {
Rajendra Nayak5643aeb2010-08-02 13:18:18 +030069 .begin = omap4_pm_begin,
70 .end = omap4_pm_end,
Rajendra Nayak5643aeb2010-08-02 13:18:18 +030071 .enter = omap4_pm_enter,
Rajendra Nayak5643aeb2010-08-02 13:18:18 +030072 .valid = suspend_valid_only_mem,
73};
74#endif /* CONFIG_SUSPEND */
75
76static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
77{
78 struct power_state *pwrst;
79
80 if (!pwrdm->pwrsts)
81 return 0;
82
83 pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
84 if (!pwrst)
85 return -ENOMEM;
86 pwrst->pwrdm = pwrdm;
87 pwrst->next_state = PWRDM_POWER_ON;
88 list_add(&pwrst->node, &pwrst_list);
89
90 return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state);
91}
92
93/**
94 * omap4_pm_init - Init routine for OMAP4 PM
95 *
96 * Initializes all powerdomain and clockdomain target states
97 * and all PRCM settings.
98 */
99static int __init omap4_pm_init(void)
100{
101 int ret;
102
103 if (!cpu_is_omap44xx())
104 return -ENODEV;
105
106 pr_err("Power Management for TI OMAP4.\n");
107
Rajendra Nayak5643aeb2010-08-02 13:18:18 +0300108 ret = pwrdm_for_each(pwrdms_setup, NULL);
109 if (ret) {
110 pr_err("Failed to setup powerdomains\n");
111 goto err2;
112 }
Rajendra Nayak5643aeb2010-08-02 13:18:18 +0300113
114#ifdef CONFIG_SUSPEND
115 suspend_set_ops(&omap_pm_ops);
116#endif /* CONFIG_SUSPEND */
117
118err2:
119 return ret;
120}
121late_initcall(omap4_pm_init);