1// SPDX-License-Identifier: GPL-2.0 2// 3// Copyright (c) 2011 Wolfson Microelectronics, plc 4// Copyright (c) 2011 Samsung Electronics Co., Ltd. 5// http://www.samsung.com 6 7#include <linux/kernel.h> 8#include <linux/init.h> 9#include <linux/cpuidle.h> 10#include <linux/io.h> 11#include <linux/export.h> 12#include <linux/time.h> 13 14#include <asm/cpuidle.h> 15 16#include "cpu.h" 17#include "map.h" 18 19#include "regs-sys-s3c64xx.h" 20#include "regs-syscon-power-s3c64xx.h" 21 22static __cpuidle int s3c64xx_enter_idle(struct cpuidle_device *dev, 23 struct cpuidle_driver *drv, int index) 24{ 25 unsigned long tmp; 26 27 /* Setup PWRCFG to enter idle mode */ 28 tmp = __raw_readl(S3C64XX_PWR_CFG); 29 tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK; 30 tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE; 31 __raw_writel(tmp, S3C64XX_PWR_CFG); 32 33 cpu_do_idle(); 34 35 return index; 36} 37 38static struct cpuidle_driver s3c64xx_cpuidle_driver = { 39 .name = "s3c64xx_cpuidle", 40 .owner = THIS_MODULE, 41 .states = { 42 { 43 .enter = s3c64xx_enter_idle, 44 .exit_latency = 1, 45 .target_residency = 1, 46 .name = "IDLE", 47 .desc = "System active, ARM gated", 48 }, 49 }, 50 .state_count = 1, 51}; 52 53static int __init s3c64xx_init_cpuidle(void) 54{ 55 if (soc_is_s3c64xx()) 56 return cpuidle_register(&s3c64xx_cpuidle_driver, NULL); 57 return 0; 58} 59device_initcall(s3c64xx_init_cpuidle); 60