ARM: restart: pxa: use new restart hook
[linux-2.6.git] / arch / arm / mach-pxa / pm.c
1 /*
2  * PXA250/210 Power Management Routines
3  *
4  * Original code for the SA11x0:
5  * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
6  *
7  * Modified for the PXA250 by Nicolas Pitre:
8  * Copyright (c) 2002 Monta Vista Software, Inc.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License.
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
19 #include <mach/pm.h>
20
21 struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
22 static unsigned long *sleep_save;
23
24 int pxa_pm_enter(suspend_state_t state)
25 {
26         unsigned long sleep_save_checksum = 0, checksum = 0;
27         int i;
28
29 #ifdef CONFIG_IWMMXT
30         /* force any iWMMXt context to ram **/
31         if (elf_hwcap & HWCAP_IWMMXT)
32                 iwmmxt_task_disable(NULL);
33 #endif
34
35         /* skip registers saving for standby */
36         if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->save) {
37                 pxa_cpu_pm_fns->save(sleep_save);
38                 /* before sleeping, calculate and save a checksum */
39                 for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
40                         sleep_save_checksum += sleep_save[i];
41         }
42
43         /* *** go zzz *** */
44         pxa_cpu_pm_fns->enter(state);
45
46         if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
47                 /* after sleeping, validate the checksum */
48                 for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
49                         checksum += sleep_save[i];
50
51                 /* if invalid, display message and wait for a hardware reset */
52                 if (checksum != sleep_save_checksum) {
53
54                         lubbock_set_hexled(0xbadbadc5);
55
56                         while (1)
57                                 pxa_cpu_pm_fns->enter(state);
58                 }
59                 pxa_cpu_pm_fns->restore(sleep_save);
60         }
61
62         pr_debug("*** made it back from resume\n");
63
64         return 0;
65 }
66
67 EXPORT_SYMBOL_GPL(pxa_pm_enter);
68
69 static int pxa_pm_valid(suspend_state_t state)
70 {
71         if (pxa_cpu_pm_fns)
72                 return pxa_cpu_pm_fns->valid(state);
73
74         return -EINVAL;
75 }
76
77 int pxa_pm_prepare(void)
78 {
79         int ret = 0;
80
81         if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
82                 ret = pxa_cpu_pm_fns->prepare();
83
84         return ret;
85 }
86
87 void pxa_pm_finish(void)
88 {
89         if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
90                 pxa_cpu_pm_fns->finish();
91 }
92
93 static const struct platform_suspend_ops pxa_pm_ops = {
94         .valid          = pxa_pm_valid,
95         .enter          = pxa_pm_enter,
96         .prepare        = pxa_pm_prepare,
97         .finish         = pxa_pm_finish,
98 };
99
100 static int __init pxa_pm_init(void)
101 {
102         if (!pxa_cpu_pm_fns) {
103                 printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
104                 return -EINVAL;
105         }
106
107         sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
108                              GFP_KERNEL);
109         if (!sleep_save) {
110                 printk(KERN_ERR "failed to alloc memory for pm save\n");
111                 return -ENOMEM;
112         }
113
114         suspend_set_ops(&pxa_pm_ops);
115         return 0;
116 }
117
118 device_initcall(pxa_pm_init);