mirror of
https://github.com/revyos/thead-kernel.git
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74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2021 Alibaba Group Holding Limited.
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* CPU idle support for Thead LIGHT SoC
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/cpuidle.h>
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#include <linux/io.h>
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#include <linux/export.h>
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#include <asm/cpuidle.h>
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#define LIGHT_MAX_STATES 1
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extern void arch_cpu_idle(void);
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/* Actual code that puts the SoC in different idle states */
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static int light_enter_idle(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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arch_cpu_idle();
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return index;
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}
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static struct cpuidle_driver light_idle_driver = {
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.name = "light_idle",
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.owner = THIS_MODULE,
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.states[0] = {
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.enter = light_enter_idle,
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.exit_latency = 1,
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.power_usage = UINT_MAX,
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.target_residency = 1,
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.name = "WFI",
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.desc = "RISC-V WFI",
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},
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.state_count = LIGHT_MAX_STATES,
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};
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/* Initialize CPU idle by registering the idle states */
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static int light_cpuidle_probe(struct platform_device *dev)
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{
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return cpuidle_register(&light_idle_driver, NULL);
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}
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static struct platform_driver light_cpuidle_driver = {
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.driver = {
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.name = "cpuidle-light",
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},
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.probe = light_cpuidle_probe,
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};
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static int __init light_cpuidle_init(void)
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{
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int ret;
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struct platform_device *pdev;
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ret = platform_driver_register(&light_cpuidle_driver);
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if (ret)
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return ret;
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pdev = platform_device_register_simple("cpuidle-light",
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-1, NULL, 0);
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if (IS_ERR(pdev)) {
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platform_driver_unregister(&light_cpuidle_driver);
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return PTR_ERR(pdev);
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}
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return 0;
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}
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device_initcall(light_cpuidle_init);
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