projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 72e06d08 | 19 | #include "powerdomain.h" |
| 5643aebb RN |
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 | |
| 5643aebb RN |
34 | static int omap4_pm_suspend(void) |
| 35 | { | |
| 36 | do_wfi(); | |
| 37 | return 0; | |
| 38 | } | |
| 39 | ||
| 40 | static 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 | ||
| 5643aebb RN |
56 | static int omap4_pm_begin(suspend_state_t state) |
| 57 | { | |
| c166381d | 58 | disable_hlt(); |
| 5643aebb RN |
59 | return 0; |
| 60 | } | |
| 61 | ||
| 62 | static void omap4_pm_end(void) | |
| 63 | { | |
| c166381d | 64 | enable_hlt(); |
| 5643aebb RN |
65 | return; |
| 66 | } | |
| 67 | ||
| 2f55ac07 | 68 | static const struct platform_suspend_ops omap_pm_ops = { |
| 5643aebb RN |
69 | .begin = omap4_pm_begin, |
| 70 | .end = omap4_pm_end, | |
| 5643aebb | 71 | .enter = omap4_pm_enter, |
| 5643aebb RN |
72 | .valid = suspend_valid_only_mem, |
| 73 | }; | |
| 74 | #endif /* CONFIG_SUSPEND */ | |
| 75 | ||
| 76 | static 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 | */ | |
| 99 | static 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 | ||
| 5643aebb RN |
108 | ret = pwrdm_for_each(pwrdms_setup, NULL); |
| 109 | if (ret) { | |
| 110 | pr_err("Failed to setup powerdomains\n"); | |
| 111 | goto err2; | |
| 112 | } | |
| 5643aebb RN |
113 | |
| 114 | #ifdef CONFIG_SUSPEND | |
| 115 | suspend_set_ops(&omap_pm_ops); | |
| 116 | #endif /* CONFIG_SUSPEND */ | |
| 117 | ||
| 118 | err2: | |
| 119 | return ret; | |
| 120 | } | |
| 121 | late_initcall(omap4_pm_init); |