Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
[pandora-kernel.git] / arch / arm / mach-mx5 / pm-imx5.c
1 /*
2  *  Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
3  *
4  * The code contained herein is licensed under the GNU General Public
5  * License. You may obtain a copy of the GNU General Public License
6  * Version 2 or later at the following locations:
7  *
8  * http://www.opensource.org/licenses/gpl-license.html
9  * http://www.gnu.org/copyleft/gpl.html
10  */
11 #include <linux/suspend.h>
12 #include <linux/clk.h>
13 #include <linux/io.h>
14 #include <linux/err.h>
15 #include <asm/cacheflush.h>
16 #include <asm/tlbflush.h>
17 #include <mach/common.h>
18 #include <mach/hardware.h>
19 #include "crm_regs.h"
20
21 static struct clk *gpc_dvfs_clk;
22
23 static int mx5_suspend_prepare(void)
24 {
25         return clk_enable(gpc_dvfs_clk);
26 }
27
28 static int mx5_suspend_enter(suspend_state_t state)
29 {
30         switch (state) {
31         case PM_SUSPEND_MEM:
32                 mx5_cpu_lp_set(STOP_POWER_OFF);
33                 break;
34         case PM_SUSPEND_STANDBY:
35                 mx5_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
36                 break;
37         default:
38                 return -EINVAL;
39         }
40
41         if (state == PM_SUSPEND_MEM) {
42                 local_flush_tlb_all();
43                 flush_cache_all();
44
45                 /*clear the EMPGC0/1 bits */
46                 __raw_writel(0, MXC_SRPG_EMPGC0_SRPGCR);
47                 __raw_writel(0, MXC_SRPG_EMPGC1_SRPGCR);
48         }
49         cpu_do_idle();
50         return 0;
51 }
52
53 static void mx5_suspend_finish(void)
54 {
55         clk_disable(gpc_dvfs_clk);
56 }
57
58 static int mx5_pm_valid(suspend_state_t state)
59 {
60         return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
61 }
62
63 static const struct platform_suspend_ops mx5_suspend_ops = {
64         .valid = mx5_pm_valid,
65         .prepare = mx5_suspend_prepare,
66         .enter = mx5_suspend_enter,
67         .finish = mx5_suspend_finish,
68 };
69
70 static int __init mx5_pm_init(void)
71 {
72         if (gpc_dvfs_clk == NULL)
73                 gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
74
75         if (!IS_ERR(gpc_dvfs_clk)) {
76                 if (cpu_is_mx51())
77                         suspend_set_ops(&mx5_suspend_ops);
78         } else
79                 return -EPERM;
80
81         return 0;
82 }
83 device_initcall(mx5_pm_init);