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 22 static int s3c64xx_enter_idle(struct cpuidle_device *dev, 23 struct cpuidle_driver *drv, 24 int index) 25 { 26 unsigned long tmp; 27 28 /* Setup PWRCFG to enter idle mode */ 29 tmp = __raw_readl(S3C64XX_PWR_CFG); 30 tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK; 31 tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE; 32 __raw_writel(tmp, S3C64XX_PWR_CFG); 33 34 cpu_do_idle(); 35 36 return index; 37 } 38 39 static struct cpuidle_driver s3c64xx_cpuidle_driver = { 40 .name = "s3c64xx_cpuidle", 41 .owner = THIS_MODULE, 42 .states = { 43 { 44 .enter = s3c64xx_enter_idle, 45 .exit_latency = 1, 46 .target_residency = 1, 47 .name = "IDLE", 48 .desc = "System active, ARM gated", 49 }, 50 }, 51 .state_count = 1, 52 }; 53 54 static int __init s3c64xx_init_cpuidle(void) 55 { 56 if (soc_is_s3c64xx()) 57 return cpuidle_register(&s3c64xx_cpuidle_driver, NULL); 58 return 0; 59 } 60 device_initcall(s3c64xx_init_cpuidle); 61