Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
[linux-2.6] / 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
18 #include <mach/pm.h>
19
20 struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
21 static unsigned long *sleep_save;
22
23 int pxa_pm_enter(suspend_state_t state)
24 {
25         unsigned long sleep_save_checksum = 0, checksum = 0;
26         int i;
27
28 #ifdef CONFIG_IWMMXT
29         /* force any iWMMXt context to ram **/
30         if (elf_hwcap & HWCAP_IWMMXT)
31                 iwmmxt_task_disable(NULL);
32 #endif
33
34         /* skip registers saving for standby */
35         if (state != PM_SUSPEND_STANDBY) {
36                 pxa_cpu_pm_fns->save(sleep_save);
37                 /* before sleeping, calculate and save a checksum */
38                 for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
39                         sleep_save_checksum += sleep_save[i];
40         }
41
42         /* *** go zzz *** */
43         pxa_cpu_pm_fns->enter(state);
44         cpu_init();
45
46         if (state != PM_SUSPEND_STANDBY) {
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 unsigned long sleep_phys_sp(void *sp)
70 {
71         return virt_to_phys(sp);
72 }
73
74 static int pxa_pm_valid(suspend_state_t state)
75 {
76         if (pxa_cpu_pm_fns)
77                 return pxa_cpu_pm_fns->valid(state);
78
79         return -EINVAL;
80 }
81
82 static int pxa_pm_prepare(void)
83 {
84         int ret = 0;
85
86         if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
87                 ret = pxa_cpu_pm_fns->prepare();
88
89         return ret;
90 }
91
92 static void pxa_pm_finish(void)
93 {
94         if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
95                 pxa_cpu_pm_fns->finish();
96 }
97
98 static struct platform_suspend_ops pxa_pm_ops = {
99         .valid          = pxa_pm_valid,
100         .enter          = pxa_pm_enter,
101         .prepare        = pxa_pm_prepare,
102         .finish         = pxa_pm_finish,
103 };
104
105 static int __init pxa_pm_init(void)
106 {
107         if (!pxa_cpu_pm_fns) {
108                 printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
109                 return -EINVAL;
110         }
111
112         sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
113                              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(&pxa_pm_ops);
120         return 0;
121 }
122
123 device_initcall(pxa_pm_init);