projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 2abf13c9 MB |
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 | ||
| 19 | #include <asm/proc-fns.h> | |
| 20 | ||
| 21 | #include <mach/map.h> | |
| 22 | ||
| 23 | #include <mach/regs-sys.h> | |
| 24 | #include <mach/regs-syscon-power.h> | |
| 25 | ||
| 26 | static int s3c64xx_enter_idle(struct cpuidle_device *dev, | |
| 27 | struct cpuidle_driver *drv, | |
| 28 | int index) | |
| 29 | { | |
| 30 | struct timeval before, after; | |
| 31 | unsigned long tmp; | |
| 32 | int idle_time; | |
| 33 | ||
| 34 | local_irq_disable(); | |
| 35 | do_gettimeofday(&before); | |
| 36 | ||
| 37 | /* Setup PWRCFG to enter idle mode */ | |
| 38 | tmp = __raw_readl(S3C64XX_PWR_CFG); | |
| 39 | tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK; | |
| 40 | tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE; | |
| 41 | __raw_writel(tmp, S3C64XX_PWR_CFG); | |
| 42 | ||
| 43 | cpu_do_idle(); | |
| 44 | ||
| 45 | do_gettimeofday(&after); | |
| 46 | local_irq_enable(); | |
| 47 | idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC + | |
| 48 | (after.tv_usec - before.tv_usec); | |
| 49 | ||
| 50 | dev->last_residency = idle_time; | |
| 51 | return index; | |
| 52 | } | |
| 53 | ||
| 54 | static struct cpuidle_state s3c64xx_cpuidle_set[] = { | |
| 55 | [0] = { | |
| 56 | .enter = s3c64xx_enter_idle, | |
| 57 | .exit_latency = 1, | |
| 58 | .target_residency = 100000, | |
| 59 | .flags = CPUIDLE_FLAG_TIME_VALID, | |
| 60 | .name = "IDLE", | |
| 61 | .desc = "System active, ARM gated", | |
| 62 | }, | |
| 63 | }; | |
| 64 | ||
| 65 | static struct cpuidle_driver s3c64xx_cpuidle_driver = { | |
| 66 | .name = "s3c64xx_cpuidle", | |
| 67 | .owner = THIS_MODULE, | |
| 68 | .state_count = ARRAY_SIZE(s3c64xx_cpuidle_set), | |
| 69 | }; | |
| 70 | ||
| 71 | static struct cpuidle_device s3c64xx_cpuidle_device = { | |
| 72 | .state_count = ARRAY_SIZE(s3c64xx_cpuidle_set), | |
| 73 | }; | |
| 74 | ||
| 75 | static int __init s3c64xx_init_cpuidle(void) | |
| 76 | { | |
| 77 | int ret; | |
| 78 | ||
| 79 | memcpy(s3c64xx_cpuidle_driver.states, s3c64xx_cpuidle_set, | |
| 80 | sizeof(s3c64xx_cpuidle_set)); | |
| 81 | cpuidle_register_driver(&s3c64xx_cpuidle_driver); | |
| 82 | ||
| 83 | ret = cpuidle_register_device(&s3c64xx_cpuidle_device); | |
| 84 | if (ret) { | |
| 85 | pr_err("Failed to register cpuidle device: %d\n", ret); | |
| 86 | return ret; | |
| 87 | } | |
| 88 | ||
| 89 | return 0; | |
| 90 | } | |
| 91 | device_initcall(s3c64xx_init_cpuidle); |