forked from luck/tmp_suning_uos_patched
7c7f8f7f2c
Add cpuidle support for ARM Cirrus Logic CLPS711X CPUs. This CPU has an unique internal register and write to this location will put the system into the Idle State by halting the clock to the processor until an interrupt is generated. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/*
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* CLPS711X CPU idle driver
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*
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* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/cpuidle.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#define CLPS711X_CPUIDLE_NAME "clps711x-cpuidle"
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static void __iomem *clps711x_halt;
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static int clps711x_cpuidle_halt(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index)
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{
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writel(0xaa, clps711x_halt);
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return index;
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}
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static struct cpuidle_driver clps711x_idle_driver = {
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.name = CLPS711X_CPUIDLE_NAME,
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.owner = THIS_MODULE,
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.states[0] = {
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.name = "HALT",
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.desc = "CLPS711X HALT",
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.enter = clps711x_cpuidle_halt,
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.exit_latency = 1,
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},
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.state_count = 1,
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};
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static int __init clps711x_cpuidle_probe(struct platform_device *pdev)
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{
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struct resource *res;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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clps711x_halt = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(clps711x_halt))
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return PTR_ERR(clps711x_halt);
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return cpuidle_register(&clps711x_idle_driver, NULL);
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}
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static struct platform_driver clps711x_cpuidle_driver = {
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.driver = {
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.name = CLPS711X_CPUIDLE_NAME,
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver_probe(clps711x_cpuidle_driver, clps711x_cpuidle_probe);
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MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
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MODULE_DESCRIPTION("CLPS711X CPU idle driver");
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MODULE_LICENSE("GPL");
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