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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 "pm.h"
20
21struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
22static unsigned long *sleep_save;
23
24int 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 while (1)
55 pxa_cpu_pm_fns->enter(state);
56 }
57 pxa_cpu_pm_fns->restore(sleep_save);
58 }
59
60 pr_debug("*** made it back from resume\n");
61
62 return 0;
63}
64
65EXPORT_SYMBOL_GPL(pxa_pm_enter);
66
67static int pxa_pm_valid(suspend_state_t state)
68{
69 if (pxa_cpu_pm_fns)
70 return pxa_cpu_pm_fns->valid(state);
71
72 return -EINVAL;
73}
74
75int pxa_pm_prepare(void)
76{
77 int ret = 0;
78
79 if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
80 ret = pxa_cpu_pm_fns->prepare();
81
82 return ret;
83}
84
85void pxa_pm_finish(void)
86{
87 if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
88 pxa_cpu_pm_fns->finish();
89}
90
91static const struct platform_suspend_ops pxa_pm_ops = {
92 .valid = pxa_pm_valid,
93 .enter = pxa_pm_enter,
94 .prepare = pxa_pm_prepare,
95 .finish = pxa_pm_finish,
96};
97
98static int __init pxa_pm_init(void)
99{
100 if (!pxa_cpu_pm_fns) {
101 printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
102 return -EINVAL;
103 }
104
105 sleep_save = kmalloc_array(pxa_cpu_pm_fns->save_count,
106 sizeof(*sleep_save),
107 GFP_KERNEL);
108 if (!sleep_save)
109 return -ENOMEM;
110
111 suspend_set_ops(&pxa_pm_ops);
112 return 0;
113}
114
115device_initcall(pxa_pm_init);
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
21struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
22static unsigned long *sleep_save;
23
24int 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
67EXPORT_SYMBOL_GPL(pxa_pm_enter);
68
69static 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
77int 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
87void pxa_pm_finish(void)
88{
89 if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
90 pxa_cpu_pm_fns->finish();
91}
92
93static 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
100static 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
118device_initcall(pxa_pm_init);