projects / deliverable / linux.git / blame
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|---|---|---|
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1 | /* linux/arch/arm/mach-s3c64xx/cpuidle.c |
| 2 | * | |
| 3 | * Copyright (c) 2011 Wolfson Microelectronics, plc | |
| 4 | * Copyright (c) 2011 Samsung Electronics Co., Ltd. | |
| 5 | * http://www.samsung.com | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/kernel.h> | |
| 13 | #include <linux/init.h> | |
| 14 | #include <linux/cpuidle.h> | |
| 15 | #include <linux/io.h> | |
| 16 | #include <linux/export.h> | |
| 17 | #include <linux/time.h> | |
| 18 | ||
| eeebc3bb | 19 | #include <asm/cpuidle.h> |
| 2abf13c9 | 20 | |
| a0e157af | 21 | #include <plat/cpu.h> |
| 2abf13c9 MB |
22 | #include <mach/map.h> |
| 23 | ||
| f2bfd174 | 24 | #include "regs-sys.h" |
| 3a71c5c3 | 25 | #include "regs-syscon-power.h" |
| f2bfd174 | 26 | |
| 2abf13c9 MB |
27 | static int s3c64xx_enter_idle(struct cpuidle_device *dev, |
| 28 | struct cpuidle_driver *drv, | |
| 29 | int index) | |
| 30 | { | |
| 2abf13c9 | 31 | unsigned long tmp; |
| 2abf13c9 MB |
32 | |
| 33 | /* Setup PWRCFG to enter idle mode */ | |
| 34 | tmp = __raw_readl(S3C64XX_PWR_CFG); | |
| 35 | tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK; | |
| 36 | tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE; | |
| 37 | __raw_writel(tmp, S3C64XX_PWR_CFG); | |
| 38 | ||
| 39 | cpu_do_idle(); | |
| 40 | ||
| 2abf13c9 MB |
41 | return index; |
| 42 | } | |
| 43 | ||
| 2abf13c9 | 44 | static struct cpuidle_driver s3c64xx_cpuidle_driver = { |
| 4c8b2075 DL |
45 | .name = "s3c64xx_cpuidle", |
| 46 | .owner = THIS_MODULE, | |
| 47 | .states = { | |
| 48 | { | |
| 49 | .enter = s3c64xx_enter_idle, | |
| 50 | .exit_latency = 1, | |
| 51 | .target_residency = 1, | |
| 4c8b2075 DL |
52 | .name = "IDLE", |
| 53 | .desc = "System active, ARM gated", | |
| 54 | }, | |
| 55 | }, | |
| 56 | .state_count = 1, | |
| 2abf13c9 MB |
57 | }; |
| 58 | ||
| 59 | static int __init s3c64xx_init_cpuidle(void) | |
| 60 | { | |
| a0e157af AB |
61 | if (soc_is_s3c64xx()) |
| 62 | return cpuidle_register(&s3c64xx_cpuidle_driver, NULL); | |
| 63 | return 0; | |
| 2abf13c9 MB |
64 | } |
| 65 | device_initcall(s3c64xx_init_cpuidle); |