| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 <plat/cpu.h> |
| 17 | #include <mach/map.h> |
| 18 | |
| 19 | #include "regs-sys.h" |
| 20 | #include "regs-syscon-power.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); |