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
pxa_pm_enter(suspend_state_t state)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 cpu_init();
46
47 if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
48 /* after sleeping, validate the checksum */
49 for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
50 checksum += sleep_save[i];
51
52 /* if invalid, display message and wait for a hardware reset */
53 if (checksum != sleep_save_checksum) {
54
55 lubbock_set_hexled(0xbadbadc5);
56
57 while (1)
58 pxa_cpu_pm_fns->enter(state);
59 }
60 pxa_cpu_pm_fns->restore(sleep_save);
61 }
62
63 pr_debug("*** made it back from resume\n");
64
65 return 0;
66 }
67
68 EXPORT_SYMBOL_GPL(pxa_pm_enter);
69
pxa_pm_valid(suspend_state_t state)70 static int pxa_pm_valid(suspend_state_t state)
71 {
72 if (pxa_cpu_pm_fns)
73 return pxa_cpu_pm_fns->valid(state);
74
75 return -EINVAL;
76 }
77
pxa_pm_prepare(void)78 int pxa_pm_prepare(void)
79 {
80 int ret = 0;
81
82 if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
83 ret = pxa_cpu_pm_fns->prepare();
84
85 return ret;
86 }
87
pxa_pm_finish(void)88 void pxa_pm_finish(void)
89 {
90 if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
91 pxa_cpu_pm_fns->finish();
92 }
93
94 static const struct platform_suspend_ops pxa_pm_ops = {
95 .valid = pxa_pm_valid,
96 .enter = pxa_pm_enter,
97 .prepare = pxa_pm_prepare,
98 .finish = pxa_pm_finish,
99 };
100
pxa_pm_init(void)101 static int __init pxa_pm_init(void)
102 {
103 if (!pxa_cpu_pm_fns) {
104 printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
105 return -EINVAL;
106 }
107
108 sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
109 GFP_KERNEL);
110 if (!sleep_save) {
111 printk(KERN_ERR "failed to alloc memory for pm save\n");
112 return -ENOMEM;
113 }
114
115 suspend_set_ops(&pxa_pm_ops);
116 return 0;
117 }
118
119 device_initcall(pxa_pm_init);
120