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_device cpuidle_dev
;
55 static struct cpuidle_driver cpuidle_driver
= {
58 .en_core_tk_irqen
= 1,
61 void sh_mobile_setup_cpuidle(void)
63 struct cpuidle_device
*dev
= &cpuidle_dev
;
64 struct cpuidle_driver
*drv
= &cpuidle_driver
;
65 struct cpuidle_state
*state
;
69 for (i
= 0; i
< CPUIDLE_STATE_MAX
; i
++) {
70 drv
->states
[i
].name
[0] = '\0';
71 drv
->states
[i
].desc
[0] = '\0';
74 i
= CPUIDLE_DRIVER_STATE_START
;
76 state
= &drv
->states
[i
++];
77 snprintf(state
->name
, CPUIDLE_NAME_LEN
, "C1");
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;
83 state
->flags
|= CPUIDLE_FLAG_TIME_VALID
;
84 state
->enter
= cpuidle_sleep_enter
;
86 drv
->safe_state_index
= i
-1;
88 if (sh_mobile_sleep_supported
& SUSP_SH_SF
) {
89 state
= &drv
->states
[i
++];
90 snprintf(state
->name
, CPUIDLE_NAME_LEN
, "C2");
91 strncpy(state
->desc
, "SuperH Sleep Mode [SF]",
93 state
->exit_latency
= 100;
94 state
->target_residency
= 1 * 2;
95 state
->power_usage
= 1;
97 state
->flags
|= CPUIDLE_FLAG_TIME_VALID
;
98 state
->enter
= cpuidle_sleep_enter
;
101 if (sh_mobile_sleep_supported
& SUSP_SH_STANDBY
) {
102 state
= &drv
->states
[i
++];
103 snprintf(state
->name
, CPUIDLE_NAME_LEN
, "C3");
104 strncpy(state
->desc
, "SuperH Mobile Standby Mode [SF]",
106 state
->exit_latency
= 2300;
107 state
->target_residency
= 1 * 2;
108 state
->power_usage
= 1;
110 state
->flags
|= CPUIDLE_FLAG_TIME_VALID
;
111 state
->enter
= cpuidle_sleep_enter
;
114 drv
->state_count
= i
;
115 dev
->state_count
= i
;
117 cpuidle_register_driver(&cpuidle_driver
);
119 cpuidle_register_device(dev
);