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);
116