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);
119