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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * CLPS711X CPU idle driver4 *5 * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>6 */7 8#include <linux/cpuidle.h>9#include <linux/err.h>10#include <linux/io.h>11#include <linux/init.h>12#include <linux/platform_device.h>13 14#define CLPS711X_CPUIDLE_NAME "clps711x-cpuidle"15 16static void __iomem *clps711x_halt;17 18static int clps711x_cpuidle_halt(struct cpuidle_device *dev,19 struct cpuidle_driver *drv, int index)20{21 writel(0xaa, clps711x_halt);22 23 return index;24}25 26static struct cpuidle_driver clps711x_idle_driver = {27 .name = CLPS711X_CPUIDLE_NAME,28 .owner = THIS_MODULE,29 .states[0] = {30 .name = "HALT",31 .desc = "CLPS711X HALT",32 .enter = clps711x_cpuidle_halt,33 .exit_latency = 1,34 },35 .state_count = 1,36};37 38static int __init clps711x_cpuidle_probe(struct platform_device *pdev)39{40 clps711x_halt = devm_platform_ioremap_resource(pdev, 0);41 if (IS_ERR(clps711x_halt))42 return PTR_ERR(clps711x_halt);43 44 return cpuidle_register(&clps711x_idle_driver, NULL);45}46 47static struct platform_driver clps711x_cpuidle_driver = {48 .driver = {49 .name = CLPS711X_CPUIDLE_NAME,50 },51};52builtin_platform_driver_probe(clps711x_cpuidle_driver, clps711x_cpuidle_probe);53