164 lines
3.4 KiB
C
164 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2014 MediaTek Inc.
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*/
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#include <linux/cpuidle.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <linux/cpu_pm.h>
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#include <linux/platform_device.h>
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#include <linux/of_platform.h>
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#include <linux/smp.h>
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#include <asm/cpuidle.h>
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#include <asm/suspend.h>
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#include <dt_idle_states.h>
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#define MTK_CPUIDLE_PREPARE (0)
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#define MTK_CPUIDLE_RESUME (1)
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typedef int (*mtk_pwr_fn)(int type,
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struct cpuidle_driver *drv,
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int index);
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static mtk_pwr_fn mtk_pwr_conservation;
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static __always_inline int __mtk_lp_enter(int index)
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{
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return CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, index);
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}
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static int mtk_idle_state_enter(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int idx)
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{
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int ret;
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if (mtk_pwr_conservation) {
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ret = mtk_pwr_conservation(MTK_CPUIDLE_PREPARE, drv, idx);
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idx = ret ? 0 : idx;
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ret = __mtk_lp_enter(idx);
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mtk_pwr_conservation(MTK_CPUIDLE_RESUME, drv, idx);
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} else
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ret = CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, 0);
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return ret;
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}
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static int mtk_regular_idle_state_enter(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int idx)
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{
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return CPU_PM_CPU_IDLE_ENTER(arm_cpuidle_suspend, idx);
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}
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static struct cpuidle_driver mtk_cpuidle_driver __initdata = {
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.name = "mtk_cpuidle",
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.owner = THIS_MODULE,
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.states[0] = {
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.enter = mtk_regular_idle_state_enter,
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.exit_latency = 1,
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.target_residency = 1,
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.power_usage = UINT_MAX,
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.name = "wfi",
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.desc = "wfi",
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},
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.state_count = 1
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};
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static const struct of_device_id mtk_idle_state_match[] __initconst = {
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{ .compatible = "mediatek,idle-state",
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.data = mtk_idle_state_enter },
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{ .compatible = "arm,idle-state",
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.data = mtk_regular_idle_state_enter },
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{ },
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};
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static int mtk_cpuidle_pm_drv_probe(struct platform_device *pdev)
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{
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if (IS_ERR_OR_NULL(pdev->dev.platform_data))
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goto mtk_probe_fail;
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mtk_pwr_conservation = *((mtk_pwr_fn *)pdev->dev.platform_data);
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return 0;
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mtk_probe_fail:
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return -ENODATA;
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}
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int mtk_cpuidle_pm_drv_remove(struct platform_device *pdev)
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{
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mtk_pwr_conservation = NULL;
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return 0;
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}
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static struct platform_driver mtk_cpuidle_pm_driver = {
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.driver = {
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.name = "mtk_cpuidle_pm",
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.owner = THIS_MODULE,
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},
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.probe = mtk_cpuidle_pm_drv_probe,
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.remove = mtk_cpuidle_pm_drv_remove,
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};
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static int __init mtk_cpuidle_driver_init(void)
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{
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int cpu, ret;
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struct cpuidle_driver *drv;
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struct cpuidle_device *dev;
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platform_driver_register(&mtk_cpuidle_pm_driver);
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for_each_possible_cpu(cpu) {
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drv = kmemdup(&mtk_cpuidle_driver, sizeof(*drv), GFP_KERNEL);
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if (!drv) {
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ret = -ENOMEM;
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goto out_fail;
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}
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drv->cpumask = (struct cpumask *)cpumask_of(cpu);
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#ifdef CONFIG_DT_IDLE_STATES
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ret = dt_init_idle_driver(drv, mtk_idle_state_match, 1);
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if (ret <= 0) {
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ret = ret ? : -ENODEV;
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goto out_kfree_drv;
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}
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#endif
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ret = arm_cpuidle_init(cpu);
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if (ret) {
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pr_err("CPU %d failed to init idle CPU ops\n", cpu);
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goto out_kfree_drv;
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}
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ret = cpuidle_register(drv, NULL);
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if (ret)
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goto out_kfree_drv;
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}
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return 0;
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out_kfree_drv:
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kfree(drv);
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out_fail:
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while (--cpu >= 0) {
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dev = per_cpu(cpuidle_devices, cpu);
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drv = cpuidle_get_cpu_driver(dev);
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cpuidle_unregister(drv);
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kfree(drv);
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}
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return ret;
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}
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device_initcall_sync(mtk_cpuidle_driver_init);
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