2 * arch/sh/kernel/cpu/shmobile/cpuidle.c
4 * Cpuidle support code for SuperH Mobile
6 * Copyright (C) 2009 Magnus Damm
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
12 #include <linux/init.h>
13 #include <linux/kernel.h>
15 #include <linux/suspend.h>
16 #include <linux/cpuidle.h>
17 #include <linux/export.h>
18 #include <asm/suspend.h>
19 #include <asm/uaccess.h>
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 */
27 static int cpuidle_sleep_enter(struct cpuidle_device *dev,
28 struct cpuidle_driver *drv,
31 unsigned long allowed_mode = SUSP_SH_SLEEP;
32 int requested_state = index;
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)
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)
47 k = min_t(int, allowed_state, requested_state);
49 sh_mobile_call_standby(cpuidle_mode[k]);
54 static struct cpuidle_driver cpuidle_driver = {
60 .target_residency = 1 * 2,
62 .enter = cpuidle_sleep_enter,
64 .desc = "SuperH Sleep Mode",
68 .target_residency = 1 * 2,
70 .enter = cpuidle_sleep_enter,
72 .desc = "SuperH Sleep Mode [SF]",
77 .target_residency = 1 * 2,
79 .enter = cpuidle_sleep_enter,
81 .desc = "SuperH Mobile Standby Mode [SF]",
85 .safe_state_index = 0,
89 int __init sh_mobile_setup_cpuidle(void)
91 if (sh_mobile_sleep_supported & SUSP_SH_SF)
92 cpuidle_driver.states[1].disabled = false;
94 if (sh_mobile_sleep_supported & SUSP_SH_STANDBY)
95 cpuidle_driver.states[2].disabled = false;
97 return cpuidle_register(&cpuidle_driver, NULL);