94 lines
1.8 KiB
C
94 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2017 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 <asm/cpuidle.h>
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#include <asm/suspend.h>
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#define CREATE_TRACE_POINTS
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//#include <trace/events/mtk_idle_event.h>
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int __attribute__((weak)) mtk_cpuidle_register_driver(void)
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{
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return -ENODEV;
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}
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void __attribute__((weak)) mtk_cpuidle_unregister_driver(void)
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{
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}
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int __init mtk_acao_cpuidle_init(void)
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{
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int cpu, ret;
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struct cpuidle_device *dev;
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/*
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* Initialize idle states data, starting at index 1.
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* This driver is DT only, if no DT idle states are detected (ret == 0)
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* let the driver initialization fail accordingly since there is no
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* reason to initialize the idle driver if only wfi is supported.
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*/
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ret = mtk_cpuidle_register_driver();
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if (ret) {
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pr_info("Failed to register mtk cpuidle driver (%d)\n", ret);
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return ret;
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}
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/*
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* Call arch CPU operations in order to initialize
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* idle states suspend back-end specific data
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*/
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for_each_possible_cpu(cpu) {
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ret = arm_cpuidle_init(cpu);
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/*
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* Skip the cpuidle device initialization if the reported
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* failure is a HW misconfiguration/breakage (-ENXIO).
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*/
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if (ret == -ENXIO)
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continue;
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if (ret) {
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pr_info("CPU %d failed to init idle CPU ops\n", cpu);
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goto out_fail;
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}
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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goto out_fail;
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dev->cpu = cpu;
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ret = cpuidle_register_device(dev);
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if (ret) {
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pr_info("Failed to register cpuidle device for CPU %d\n",
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cpu);
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kfree(dev);
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goto out_fail;
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}
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}
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return 0;
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out_fail:
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while (cpu > 0) {
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cpu--;
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dev = per_cpu(cpuidle_devices, cpu);
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cpuidle_unregister_device(dev);
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kfree(dev);
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}
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mtk_cpuidle_unregister_driver();
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return ret;
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}
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device_initcall(mtk_acao_cpuidle_init);
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