| 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 <linux/export.h> |
| 18 | #include <asm/suspend.h> |
| 19 | #include <linux/uaccess.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 | SUSP_SH_STANDBY | SUSP_SH_SF, /* software standby mode + self refresh */ |
| 25 | }; |
| 26 | |
| 27 | static int cpuidle_sleep_enter(struct cpuidle_device *dev, |
| 28 | struct cpuidle_driver *drv, |
| 29 | int index) |
| 30 | { |
| 31 | unsigned long allowed_mode = SUSP_SH_SLEEP; |
| 32 | int requested_state = index; |
| 33 | int allowed_state; |
| 34 | int k; |
| 35 | |
| 36 | /* convert allowed mode to allowed state */ |
| 37 | for (k = ARRAY_SIZE(cpuidle_mode) - 1; k > 0; k--) |
| 38 | if (cpuidle_mode[k] == allowed_mode) |
| 39 | break; |
| 40 | |
| 41 | allowed_state = k; |
| 42 | |
| 43 | /* take the following into account for sleep mode selection: |
| 44 | * - allowed_state: best mode allowed by hardware (clock deps) |
| 45 | * - requested_state: best mode allowed by software (latencies) |
| 46 | */ |
| 47 | k = min_t(int, allowed_state, requested_state); |
| 48 | |
| 49 | sh_mobile_call_standby(cpuidle_mode[k]); |
| 50 | |
| 51 | return k; |
| 52 | } |
| 53 | |
| 54 | static struct cpuidle_driver cpuidle_driver = { |
| 55 | .name = "sh_idle", |
| 56 | .owner = THIS_MODULE, |
| 57 | .states = { |
| 58 | { |
| 59 | .exit_latency = 1, |
| 60 | .target_residency = 1 * 2, |
| 61 | .power_usage = 3, |
| 62 | .enter = cpuidle_sleep_enter, |
| 63 | .name = "C1", |
| 64 | .desc = "SuperH Sleep Mode", |
| 65 | }, |
| 66 | { |
| 67 | .exit_latency = 100, |
| 68 | .target_residency = 1 * 2, |
| 69 | .power_usage = 1, |
| 70 | .enter = cpuidle_sleep_enter, |
| 71 | .name = "C2", |
| 72 | .desc = "SuperH Sleep Mode [SF]", |
| 73 | .disabled = true, |
| 74 | }, |
| 75 | { |
| 76 | .exit_latency = 2300, |
| 77 | .target_residency = 1 * 2, |
| 78 | .power_usage = 1, |
| 79 | .enter = cpuidle_sleep_enter, |
| 80 | .name = "C3", |
| 81 | .desc = "SuperH Mobile Standby Mode [SF]", |
| 82 | .disabled = true, |
| 83 | }, |
| 84 | }, |
| 85 | .safe_state_index = 0, |
| 86 | .state_count = 3, |
| 87 | }; |
| 88 | |
| 89 | int __init sh_mobile_setup_cpuidle(void) |
| 90 | { |
| 91 | if (sh_mobile_sleep_supported & SUSP_SH_SF) |
| 92 | cpuidle_driver.states[1].disabled = false; |
| 93 | |
| 94 | if (sh_mobile_sleep_supported & SUSP_SH_STANDBY) |
| 95 | cpuidle_driver.states[2].disabled = false; |
| 96 | |
| 97 | return cpuidle_register(&cpuidle_driver, NULL); |
| 98 | } |