Merge branch 'master' of git://git.infradead.org/users/pcmoore/selinux into next
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / cpuidle / cpuidle-at91.c
1 /*
2  * based on arch/arm/mach-kirkwood/cpuidle.c
3  *
4  * CPU idle support for AT91 SoC
5  *
6  * This file is licensed under the terms of the GNU General Public
7  * License version 2.  This program is licensed "as is" without any
8  * warranty of any kind, whether express or implied.
9  *
10  * The cpu idle uses wait-for-interrupt and RAM self refresh in order
11  * to implement two idle states -
12  * #1 wait-for-interrupt
13  * #2 wait-for-interrupt and RAM self refresh
14  */
15
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/platform_device.h>
19 #include <linux/cpuidle.h>
20 #include <linux/io.h>
21 #include <linux/export.h>
22 #include <asm/proc-fns.h>
23 #include <asm/cpuidle.h>
24
25 #define AT91_MAX_STATES 2
26
27 static void (*at91_standby)(void);
28
29 /* Actual code that puts the SoC in different idle states */
30 static int at91_enter_idle(struct cpuidle_device *dev,
31                         struct cpuidle_driver *drv,
32                                int index)
33 {
34         at91_standby();
35         return index;
36 }
37
38 static struct cpuidle_driver at91_idle_driver = {
39         .name                   = "at91_idle",
40         .owner                  = THIS_MODULE,
41         .states[0]              = ARM_CPUIDLE_WFI_STATE,
42         .states[1]              = {
43                 .enter                  = at91_enter_idle,
44                 .exit_latency           = 10,
45                 .target_residency       = 10000,
46                 .flags                  = CPUIDLE_FLAG_TIME_VALID,
47                 .name                   = "RAM_SR",
48                 .desc                   = "WFI and DDR Self Refresh",
49         },
50         .state_count = AT91_MAX_STATES,
51 };
52
53 /* Initialize CPU idle by registering the idle states */
54 static int at91_cpuidle_probe(struct platform_device *dev)
55 {
56         at91_standby = (void *)(dev->dev.platform_data);
57         
58         return cpuidle_register(&at91_idle_driver, NULL);
59 }
60
61 static struct platform_driver at91_cpuidle_driver = {
62         .driver = {
63                 .name = "cpuidle-at91",
64                 .owner = THIS_MODULE,
65         },
66         .probe = at91_cpuidle_probe,
67 };
68
69 module_platform_driver(at91_cpuidle_driver);