ARM: etm: Add sysfs entry to enable timestamps if supported
[linux-2.6.git] / arch / unicore32 / kernel / pm.c
1 /*
2  * linux/arch/unicore32/kernel/pm.c
3  *
4  * Code specific to PKUnity SoC and UniCore ISA
5  *
6  *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
7  *      Copyright (C) 2001-2010 Guan Xuetao
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/suspend.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/io.h>
19
20 #include <mach/hardware.h>
21 #include <mach/pm.h>
22
23 #include "setup.h"
24
25 struct puv3_cpu_pm_fns *puv3_cpu_pm_fns;
26 static unsigned long *sleep_save;
27
28 int puv3_pm_enter(suspend_state_t state)
29 {
30         unsigned long sleep_save_checksum = 0, checksum = 0;
31         int i;
32
33         /* skip registers saving for standby */
34         if (state != PM_SUSPEND_STANDBY) {
35                 puv3_cpu_pm_fns->save(sleep_save);
36                 /* before sleeping, calculate and save a checksum */
37                 for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++)
38                         sleep_save_checksum += sleep_save[i];
39         }
40
41         /* *** go zzz *** */
42         puv3_cpu_pm_fns->enter(state);
43         cpu_init();
44 #ifdef CONFIG_INPUT_KEYBOARD
45         puv3_ps2_init();
46 #endif
47 #ifdef CONFIG_PCI
48         pci_puv3_preinit();
49 #endif
50         if (state != PM_SUSPEND_STANDBY) {
51                 /* after sleeping, validate the checksum */
52                 for (i = 0; i < puv3_cpu_pm_fns->save_count - 1; i++)
53                         checksum += sleep_save[i];
54
55                 /* if invalid, display message and wait for a hardware reset */
56                 if (checksum != sleep_save_checksum) {
57                         while (1)
58                                 puv3_cpu_pm_fns->enter(state);
59                 }
60                 puv3_cpu_pm_fns->restore(sleep_save);
61         }
62
63         pr_debug("*** made it back from resume\n");
64
65         return 0;
66 }
67 EXPORT_SYMBOL_GPL(puv3_pm_enter);
68
69 unsigned long sleep_phys_sp(void *sp)
70 {
71         return virt_to_phys(sp);
72 }
73
74 static int puv3_pm_valid(suspend_state_t state)
75 {
76         if (puv3_cpu_pm_fns)
77                 return puv3_cpu_pm_fns->valid(state);
78
79         return -EINVAL;
80 }
81
82 static int puv3_pm_prepare(void)
83 {
84         int ret = 0;
85
86         if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->prepare)
87                 ret = puv3_cpu_pm_fns->prepare();
88
89         return ret;
90 }
91
92 static void puv3_pm_finish(void)
93 {
94         if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->finish)
95                 puv3_cpu_pm_fns->finish();
96 }
97
98 static struct platform_suspend_ops puv3_pm_ops = {
99         .valid          = puv3_pm_valid,
100         .enter          = puv3_pm_enter,
101         .prepare        = puv3_pm_prepare,
102         .finish         = puv3_pm_finish,
103 };
104
105 static int __init puv3_pm_init(void)
106 {
107         if (!puv3_cpu_pm_fns) {
108                 printk(KERN_ERR "no valid puv3_cpu_pm_fns defined\n");
109                 return -EINVAL;
110         }
111
112         sleep_save = kmalloc(puv3_cpu_pm_fns->save_count
113                                 * sizeof(unsigned long), GFP_KERNEL);
114         if (!sleep_save) {
115                 printk(KERN_ERR "failed to alloc memory for pm save\n");
116                 return -ENOMEM;
117         }
118
119         suspend_set_ops(&puv3_pm_ops);
120         return 0;
121 }
122
123 device_initcall(puv3_pm_init);