Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame^] | 1 | /* Copyright (c) 2010, Code Aurora Forum. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/cpuidle.h> |
| 17 | |
| 18 | #include "cpuidle.h" |
| 19 | #include "pm.h" |
| 20 | |
| 21 | static DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuidle_device, msm_cpuidle_devs); |
| 22 | static struct cpuidle_driver msm_cpuidle_driver = { |
| 23 | .name = "msm_idle", |
| 24 | .owner = THIS_MODULE, |
| 25 | }; |
| 26 | |
| 27 | #ifdef CONFIG_MSM_SLEEP_STATS |
| 28 | static DEFINE_PER_CPU(struct atomic_notifier_head, msm_cpuidle_notifiers); |
| 29 | |
| 30 | int msm_cpuidle_register_notifier(unsigned int cpu, struct notifier_block *nb) |
| 31 | { |
| 32 | struct atomic_notifier_head *head = |
| 33 | &per_cpu(msm_cpuidle_notifiers, cpu); |
| 34 | |
| 35 | return atomic_notifier_chain_register(head, nb); |
| 36 | } |
| 37 | EXPORT_SYMBOL(msm_cpuidle_register_notifier); |
| 38 | |
| 39 | int msm_cpuidle_unregister_notifier(unsigned int cpu, struct notifier_block *nb) |
| 40 | { |
| 41 | struct atomic_notifier_head *head = |
| 42 | &per_cpu(msm_cpuidle_notifiers, cpu); |
| 43 | |
| 44 | return atomic_notifier_chain_unregister(head, nb); |
| 45 | } |
| 46 | EXPORT_SYMBOL(msm_cpuidle_unregister_notifier); |
| 47 | #endif |
| 48 | |
| 49 | static int msm_cpuidle_enter( |
| 50 | struct cpuidle_device *dev, struct cpuidle_state *state) |
| 51 | { |
| 52 | int ret; |
| 53 | #ifdef CONFIG_MSM_SLEEP_STATS |
| 54 | struct atomic_notifier_head *head = |
| 55 | &__get_cpu_var(msm_cpuidle_notifiers); |
| 56 | #endif |
| 57 | |
| 58 | local_irq_disable(); |
| 59 | |
| 60 | #ifdef CONFIG_MSM_SLEEP_STATS |
| 61 | atomic_notifier_call_chain(head, MSM_CPUIDLE_STATE_ENTER, NULL); |
| 62 | #endif |
| 63 | |
| 64 | ret = msm_pm_idle_enter((enum msm_pm_sleep_mode) (state->driver_data)); |
| 65 | |
| 66 | #ifdef CONFIG_MSM_SLEEP_STATS |
| 67 | atomic_notifier_call_chain(head, MSM_CPUIDLE_STATE_EXIT, NULL); |
| 68 | #endif |
| 69 | |
| 70 | local_irq_enable(); |
| 71 | |
| 72 | return ret; |
| 73 | } |
| 74 | |
| 75 | void __init msm_cpuidle_set_states(struct msm_cpuidle_state *states, |
| 76 | int nr_states, struct msm_pm_platform_data *pm_data) |
| 77 | { |
| 78 | unsigned int cpu; |
| 79 | |
| 80 | for_each_possible_cpu(cpu) { |
| 81 | struct cpuidle_device *dev = &per_cpu(msm_cpuidle_devs, cpu); |
| 82 | int i; |
| 83 | |
| 84 | dev->cpu = cpu; |
| 85 | dev->prepare = msm_pm_idle_prepare; |
| 86 | |
| 87 | for (i = 0; i < nr_states; i++) { |
| 88 | struct msm_cpuidle_state *cstate = &states[i]; |
| 89 | struct cpuidle_state *state; |
| 90 | struct msm_pm_platform_data *pm_mode; |
| 91 | |
| 92 | if (cstate->cpu != cpu) |
| 93 | continue; |
| 94 | |
| 95 | state = &dev->states[cstate->state_nr]; |
| 96 | pm_mode = &pm_data[MSM_PM_MODE(cpu, cstate->mode_nr)]; |
| 97 | |
| 98 | snprintf(state->name, CPUIDLE_NAME_LEN, cstate->name); |
| 99 | snprintf(state->desc, CPUIDLE_DESC_LEN, cstate->desc); |
| 100 | state->driver_data = (void *) cstate->mode_nr; |
| 101 | state->flags = CPUIDLE_FLAG_TIME_VALID; |
| 102 | state->exit_latency = pm_mode->latency; |
| 103 | state->power_usage = 0; |
| 104 | state->target_residency = pm_mode->residency; |
| 105 | state->enter = msm_cpuidle_enter; |
| 106 | } |
| 107 | |
| 108 | for (i = 0; i < CPUIDLE_STATE_MAX; i++) { |
| 109 | if (dev->states[i].enter == NULL) |
| 110 | break; |
| 111 | dev->state_count = i + 1; |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | int __init msm_cpuidle_init(void) |
| 117 | { |
| 118 | unsigned int cpu; |
| 119 | int ret; |
| 120 | |
| 121 | ret = cpuidle_register_driver(&msm_cpuidle_driver); |
| 122 | if (ret) |
| 123 | pr_err("%s: failed to register cpuidle driver: %d\n", |
| 124 | __func__, ret); |
| 125 | |
| 126 | for_each_possible_cpu(cpu) { |
| 127 | struct cpuidle_device *dev = &per_cpu(msm_cpuidle_devs, cpu); |
| 128 | |
| 129 | ret = cpuidle_register_device(dev); |
| 130 | if (ret) { |
| 131 | pr_err("%s: failed to register cpuidle device for " |
| 132 | "cpu %u: %d\n", __func__, cpu, ret); |
| 133 | return ret; |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | static int __init msm_cpuidle_early_init(void) |
| 141 | { |
| 142 | #ifdef CONFIG_MSM_SLEEP_STATS |
| 143 | unsigned int cpu; |
| 144 | |
| 145 | for_each_possible_cpu(cpu) |
| 146 | ATOMIC_INIT_NOTIFIER_HEAD(&per_cpu(msm_cpuidle_notifiers, cpu)); |
| 147 | #endif |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | early_initcall(msm_cpuidle_early_init); |