projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 7426394f MD |
1 | /* |
| 2 | * arch/sh/kernel/cpu/shmobile/cpuidle.c | |
| 3 | * | |
| 4 | * Cpuidle support code for SuperH Mobile | |
| 5 | * | |
| 6 | * Copyright (C) 2009 Magnus Damm | |
| 7 | * | |
| 8 | * This file is subject to the terms and conditions of the GNU General Public | |
| 9 | * License. See the file "COPYING" in the main directory of this archive | |
| 10 | * for more details. | |
| 11 | */ | |
| 12 | #include <linux/init.h> | |
| 13 | #include <linux/kernel.h> | |
| 14 | #include <linux/io.h> | |
| 15 | #include <linux/suspend.h> | |
| 16 | #include <linux/cpuidle.h> | |
| 17 | #include <asm/suspend.h> | |
| 18 | #include <asm/uaccess.h> | |
| 19 | #include <asm/hwblk.h> | |
| 20 | ||
| 21 | static unsigned long cpuidle_mode[] = { | |
| 22 | SUSP_SH_SLEEP, /* regular sleep mode */ | |
| 23 | SUSP_SH_SLEEP | SUSP_SH_SF, /* sleep mode + self refresh */ | |
| 24 | }; | |
| 25 | ||
| 26 | static int cpuidle_sleep_enter(struct cpuidle_device *dev, | |
| 27 | struct cpuidle_state *state) | |
| 28 | { | |
| 29 | unsigned long allowed_mode = arch_hwblk_sleep_mode(); | |
| 30 | ktime_t before, after; | |
| 31 | int requested_state = state - &dev->states[0]; | |
| 32 | int allowed_state; | |
| 33 | int k; | |
| 34 | ||
| 35 | /* convert allowed mode to allowed state */ | |
| 36 | for (k = ARRAY_SIZE(cpuidle_mode) - 1; k > 0; k--) | |
| 37 | if (cpuidle_mode[k] == allowed_mode) | |
| 38 | break; | |
| 39 | ||
| 40 | allowed_state = k; | |
| 41 | ||
| 42 | /* take the following into account for sleep mode selection: | |
| 43 | * - allowed_state: best mode allowed by hardware (clock deps) | |
| 44 | * - requested_state: best mode allowed by software (latencies) | |
| 45 | */ | |
| 46 | k = min_t(int, allowed_state, requested_state); | |
| 47 | ||
| 48 | dev->last_state = &dev->states[k]; | |
| 49 | before = ktime_get(); | |
| 50 | sh_mobile_call_standby(cpuidle_mode[k]); | |
| 51 | after = ktime_get(); | |
| 52 | return ktime_to_ns(ktime_sub(after, before)) >> 10; | |
| 53 | } | |
| 54 | ||
| 55 | static struct cpuidle_device cpuidle_dev; | |
| 56 | static struct cpuidle_driver cpuidle_driver = { | |
| 57 | .name = "sh_idle", | |
| 58 | .owner = THIS_MODULE, | |
| 59 | }; | |
| 60 | ||
| 61 | void sh_mobile_setup_cpuidle(void) | |
| 62 | { | |
| 63 | struct cpuidle_device *dev = &cpuidle_dev; | |
| 64 | struct cpuidle_state *state; | |
| 65 | int i; | |
| 66 | ||
| 67 | cpuidle_register_driver(&cpuidle_driver); | |
| 68 | ||
| 69 | for (i = 0; i < CPUIDLE_STATE_MAX; i++) { | |
| 70 | dev->states[i].name[0] = '\0'; | |
| 71 | dev->states[i].desc[0] = '\0'; | |
| 72 | } | |
| 73 | ||
| 74 | i = CPUIDLE_DRIVER_STATE_START; | |
| 75 | ||
| 76 | state = &dev->states[i++]; | |
| 77 | snprintf(state->name, CPUIDLE_NAME_LEN, "C0"); | |
| 78 | strncpy(state->desc, "SuperH Sleep Mode", CPUIDLE_DESC_LEN); | |
| 79 | state->exit_latency = 1; | |
| 80 | state->target_residency = 1 * 2; | |
| 81 | state->power_usage = 3; | |
| 82 | state->flags = 0; | |
| 83 | state->flags |= CPUIDLE_FLAG_SHALLOW; | |
| 84 | state->flags |= CPUIDLE_FLAG_TIME_VALID; | |
| 85 | state->enter = cpuidle_sleep_enter; | |
| 86 | ||
| 87 | dev->safe_state = state; | |
| 88 | ||
| 89 | state = &dev->states[i++]; | |
| 90 | snprintf(state->name, CPUIDLE_NAME_LEN, "C1"); | |
| 91 | strncpy(state->desc, "SuperH Sleep Mode [SF]", CPUIDLE_DESC_LEN); | |
| 92 | state->exit_latency = 100; | |
| 93 | state->target_residency = 1 * 2; | |
| 94 | state->power_usage = 1; | |
| 95 | state->flags = 0; | |
| 96 | state->flags |= CPUIDLE_FLAG_TIME_VALID; | |
| 97 | state->enter = cpuidle_sleep_enter; | |
| 98 | ||
| 99 | dev->state_count = i; | |
| 100 | ||
| 101 | cpuidle_register_device(dev); | |
| 102 | } |