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1 | /* |
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 | |
19 | #include <plat/powerdomain.h> |
20 | #include <mach/omap4-common.h> |
21 | |
22 | struct 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 | |
31 | static LIST_HEAD(pwrst_list); |
32 | |
33 | #ifdef CONFIG_SUSPEND |
34 | static int omap4_pm_prepare(void) |
35 | { |
36 | disable_hlt(); |
37 | return 0; |
38 | } |
39 | |
40 | static int omap4_pm_suspend(void) |
41 | { |
42 | do_wfi(); |
43 | return 0; |
44 | } |
45 | |
46 | static int omap4_pm_enter(suspend_state_t suspend_state) |
47 | { |
48 | int ret = 0; |
49 | |
50 | switch (suspend_state) { |
51 | case PM_SUSPEND_STANDBY: |
52 | case PM_SUSPEND_MEM: |
53 | ret = omap4_pm_suspend(); |
54 | break; |
55 | default: |
56 | ret = -EINVAL; |
57 | } |
58 | |
59 | return ret; |
60 | } |
61 | |
62 | static void omap4_pm_finish(void) |
63 | { |
64 | enable_hlt(); |
65 | return; |
66 | } |
67 | |
68 | static int omap4_pm_begin(suspend_state_t state) |
69 | { |
70 | return 0; |
71 | } |
72 | |
73 | static void omap4_pm_end(void) |
74 | { |
75 | return; |
76 | } |
77 | |
78 | static struct platform_suspend_ops omap_pm_ops = { |
79 | .begin = omap4_pm_begin, |
80 | .end = omap4_pm_end, |
81 | .prepare = omap4_pm_prepare, |
82 | .enter = omap4_pm_enter, |
83 | .finish = omap4_pm_finish, |
84 | .valid = suspend_valid_only_mem, |
85 | }; |
86 | #endif /* CONFIG_SUSPEND */ |
87 | |
88 | static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused) |
89 | { |
90 | struct power_state *pwrst; |
91 | |
92 | if (!pwrdm->pwrsts) |
93 | return 0; |
94 | |
95 | pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC); |
96 | if (!pwrst) |
97 | return -ENOMEM; |
98 | pwrst->pwrdm = pwrdm; |
99 | pwrst->next_state = PWRDM_POWER_ON; |
100 | list_add(&pwrst->node, &pwrst_list); |
101 | |
102 | return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state); |
103 | } |
104 | |
105 | /** |
106 | * omap4_pm_init - Init routine for OMAP4 PM |
107 | * |
108 | * Initializes all powerdomain and clockdomain target states |
109 | * and all PRCM settings. |
110 | */ |
111 | static int __init omap4_pm_init(void) |
112 | { |
113 | int ret; |
114 | |
115 | if (!cpu_is_omap44xx()) |
116 | return -ENODEV; |
117 | |
118 | pr_err("Power Management for TI OMAP4.\n"); |
119 | |
120 | #ifdef CONFIG_PM |
121 | ret = pwrdm_for_each(pwrdms_setup, NULL); |
122 | if (ret) { |
123 | pr_err("Failed to setup powerdomains\n"); |
124 | goto err2; |
125 | } |
126 | #endif |
127 | |
128 | #ifdef CONFIG_SUSPEND |
129 | suspend_set_ops(&omap_pm_ops); |
130 | #endif /* CONFIG_SUSPEND */ |
131 | |
132 | err2: |
133 | return ret; |
134 | } |
135 | late_initcall(omap4_pm_init); |
136 |
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