Commit | Line | Data |
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5643aebb RN |
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 | ||
4e65331c | 19 | #include "common.h" |
3c50729b | 20 | #include "clockdomain.h" |
72e06d08 | 21 | #include "powerdomain.h" |
5643aebb RN |
22 | |
23 | struct power_state { | |
24 | struct powerdomain *pwrdm; | |
25 | u32 next_state; | |
26 | #ifdef CONFIG_SUSPEND | |
27 | u32 saved_state; | |
28 | #endif | |
29 | struct list_head node; | |
30 | }; | |
31 | ||
32 | static LIST_HEAD(pwrst_list); | |
33 | ||
34 | #ifdef CONFIG_SUSPEND | |
5643aebb RN |
35 | static int omap4_pm_suspend(void) |
36 | { | |
37 | do_wfi(); | |
38 | return 0; | |
39 | } | |
40 | ||
41 | static int omap4_pm_enter(suspend_state_t suspend_state) | |
42 | { | |
43 | int ret = 0; | |
44 | ||
45 | switch (suspend_state) { | |
46 | case PM_SUSPEND_STANDBY: | |
47 | case PM_SUSPEND_MEM: | |
48 | ret = omap4_pm_suspend(); | |
49 | break; | |
50 | default: | |
51 | ret = -EINVAL; | |
52 | } | |
53 | ||
54 | return ret; | |
55 | } | |
56 | ||
5643aebb RN |
57 | static int omap4_pm_begin(suspend_state_t state) |
58 | { | |
c166381d | 59 | disable_hlt(); |
5643aebb RN |
60 | return 0; |
61 | } | |
62 | ||
63 | static void omap4_pm_end(void) | |
64 | { | |
c166381d | 65 | enable_hlt(); |
5643aebb RN |
66 | return; |
67 | } | |
68 | ||
2f55ac07 | 69 | static const struct platform_suspend_ops omap_pm_ops = { |
5643aebb RN |
70 | .begin = omap4_pm_begin, |
71 | .end = omap4_pm_end, | |
5643aebb | 72 | .enter = omap4_pm_enter, |
5643aebb RN |
73 | .valid = suspend_valid_only_mem, |
74 | }; | |
75 | #endif /* CONFIG_SUSPEND */ | |
76 | ||
3c50729b SS |
77 | /* |
78 | * Enable hardware supervised mode for all clockdomains if it's | |
79 | * supported. Initiate sleep transition for other clockdomains, if | |
80 | * they are not used | |
81 | */ | |
82 | static int __init clkdms_setup(struct clockdomain *clkdm, void *unused) | |
83 | { | |
84 | if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO) | |
85 | clkdm_allow_idle(clkdm); | |
86 | else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP && | |
87 | atomic_read(&clkdm->usecount) == 0) | |
88 | clkdm_sleep(clkdm); | |
89 | return 0; | |
90 | } | |
91 | ||
92 | ||
5643aebb RN |
93 | static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused) |
94 | { | |
95 | struct power_state *pwrst; | |
96 | ||
97 | if (!pwrdm->pwrsts) | |
98 | return 0; | |
99 | ||
100 | pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC); | |
101 | if (!pwrst) | |
102 | return -ENOMEM; | |
103 | pwrst->pwrdm = pwrdm; | |
104 | pwrst->next_state = PWRDM_POWER_ON; | |
105 | list_add(&pwrst->node, &pwrst_list); | |
106 | ||
107 | return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state); | |
108 | } | |
109 | ||
110 | /** | |
111 | * omap4_pm_init - Init routine for OMAP4 PM | |
112 | * | |
113 | * Initializes all powerdomain and clockdomain target states | |
114 | * and all PRCM settings. | |
115 | */ | |
116 | static int __init omap4_pm_init(void) | |
117 | { | |
118 | int ret; | |
12f27826 SS |
119 | struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm; |
120 | struct clockdomain *ducati_clkdm, *l3_2_clkdm, *l4_per_clkdm; | |
5643aebb RN |
121 | |
122 | if (!cpu_is_omap44xx()) | |
123 | return -ENODEV; | |
124 | ||
361b02f3 SS |
125 | if (omap_rev() == OMAP4430_REV_ES1_0) { |
126 | WARN(1, "Power Management not supported on OMAP4430 ES1.0\n"); | |
127 | return -ENODEV; | |
128 | } | |
129 | ||
5643aebb RN |
130 | pr_err("Power Management for TI OMAP4.\n"); |
131 | ||
5643aebb RN |
132 | ret = pwrdm_for_each(pwrdms_setup, NULL); |
133 | if (ret) { | |
134 | pr_err("Failed to setup powerdomains\n"); | |
135 | goto err2; | |
136 | } | |
5643aebb | 137 | |
12f27826 SS |
138 | /* |
139 | * The dynamic dependency between MPUSS -> MEMIF and | |
140 | * MPUSS -> L4_PER/L3_* and DUCATI -> L3_* doesn't work as | |
141 | * expected. The hardware recommendation is to enable static | |
142 | * dependencies for these to avoid system lock ups or random crashes. | |
143 | */ | |
144 | mpuss_clkdm = clkdm_lookup("mpuss_clkdm"); | |
145 | emif_clkdm = clkdm_lookup("l3_emif_clkdm"); | |
146 | l3_1_clkdm = clkdm_lookup("l3_1_clkdm"); | |
147 | l3_2_clkdm = clkdm_lookup("l3_2_clkdm"); | |
148 | l4_per_clkdm = clkdm_lookup("l4_per_clkdm"); | |
149 | ducati_clkdm = clkdm_lookup("ducati_clkdm"); | |
150 | if ((!mpuss_clkdm) || (!emif_clkdm) || (!l3_1_clkdm) || | |
151 | (!l3_2_clkdm) || (!ducati_clkdm) || (!l4_per_clkdm)) | |
152 | goto err2; | |
153 | ||
154 | ret = clkdm_add_wkdep(mpuss_clkdm, emif_clkdm); | |
155 | ret |= clkdm_add_wkdep(mpuss_clkdm, l3_1_clkdm); | |
156 | ret |= clkdm_add_wkdep(mpuss_clkdm, l3_2_clkdm); | |
157 | ret |= clkdm_add_wkdep(mpuss_clkdm, l4_per_clkdm); | |
158 | ret |= clkdm_add_wkdep(ducati_clkdm, l3_1_clkdm); | |
159 | ret |= clkdm_add_wkdep(ducati_clkdm, l3_2_clkdm); | |
160 | if (ret) { | |
161 | pr_err("Failed to add MPUSS -> L3/EMIF/L4PER, DUCATI -> L3 " | |
162 | "wakeup dependency\n"); | |
163 | goto err2; | |
164 | } | |
165 | ||
3c50729b SS |
166 | (void) clkdm_for_each(clkdms_setup, NULL); |
167 | ||
5643aebb RN |
168 | #ifdef CONFIG_SUSPEND |
169 | suspend_set_ops(&omap_pm_ops); | |
170 | #endif /* CONFIG_SUSPEND */ | |
171 | ||
172 | err2: | |
173 | return ret; | |
174 | } | |
175 | late_initcall(omap4_pm_init); |