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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/init.h>
Richard Purdie756c7b72005-11-06 15:03:23 +000014#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/suspend.h>
16#include <linux/errno.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Russell Kinga09e64f2008-08-05 16:14:15 +010019#include <mach/pm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
Eric Miao711be5c2007-07-18 11:38:45 +010021struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
22static unsigned long *sleep_save;
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Richard Purdie756c7b72005-11-06 15:03:23 +000024int pxa_pm_enter(suspend_state_t state)
Linus Torvalds1da177e2005-04-16 15:20:36 -070025{
Eric Miao711be5c2007-07-18 11:38:45 +010026 unsigned long sleep_save_checksum = 0, checksum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29#ifdef CONFIG_IWMMXT
30 /* force any iWMMXt context to ram **/
Lennert Buytenhekafe4b252006-12-03 18:51:14 +010031 if (elf_hwcap & HWCAP_IWMMXT)
32 iwmmxt_task_disable(NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#endif
34
eric miao512f03f2008-01-14 15:50:54 +080035 /* skip registers saving for standby */
Eric Miao3d9cb0e2011-01-26 05:04:00 +080036 if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->save) {
eric miao512f03f2008-01-14 15:50:54 +080037 pxa_cpu_pm_fns->save(sleep_save);
38 /* before sleeping, calculate and save a checksum */
Robert Jarzmik649de512008-05-02 21:17:06 +010039 for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
eric miao512f03f2008-01-14 15:50:54 +080040 sleep_save_checksum += sleep_save[i];
41 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 /* *** go zzz *** */
Eric Miao711be5c2007-07-18 11:38:45 +010044 pxa_cpu_pm_fns->enter(state);
Russell King36c5ed22005-06-19 18:39:33 +010045
Eric Miao3d9cb0e2011-01-26 05:04:00 +080046 if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
eric miao512f03f2008-01-14 15:50:54 +080047 /* after sleeping, validate the checksum */
Robert Jarzmik649de512008-05-02 21:17:06 +010048 for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
eric miao512f03f2008-01-14 15:50:54 +080049 checksum += sleep_save[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
eric miao512f03f2008-01-14 15:50:54 +080051 /* if invalid, display message and wait for a hardware reset */
52 if (checksum != sleep_save_checksum) {
Eric Miao54386142009-01-19 18:43:12 +080053
54 lubbock_set_hexled(0xbadbadc5);
55
eric miao512f03f2008-01-14 15:50:54 +080056 while (1)
57 pxa_cpu_pm_fns->enter(state);
58 }
59 pxa_cpu_pm_fns->restore(sleep_save);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 }
61
Eric Miao711be5c2007-07-18 11:38:45 +010062 pr_debug("*** made it back from resume\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64 return 0;
65}
66
Richard Purdie756c7b72005-11-06 15:03:23 +000067EXPORT_SYMBOL_GPL(pxa_pm_enter);
68
Eric Miao711be5c2007-07-18 11:38:45 +010069static 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
Pavel Machek51cdd922009-06-11 23:25:09 +080077int pxa_pm_prepare(void)
Russell King41049802008-08-27 12:55:04 +010078{
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
Pavel Machek51cdd922009-06-11 23:25:09 +080087void pxa_pm_finish(void)
Russell King41049802008-08-27 12:55:04 +010088{
89 if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
90 pxa_cpu_pm_fns->finish();
91}
92
Lionel Debroux2f55ac02010-11-16 14:14:02 +010093static const struct platform_suspend_ops pxa_pm_ops = {
Eric Miao711be5c2007-07-18 11:38:45 +010094 .valid = pxa_pm_valid,
95 .enter = pxa_pm_enter,
Russell King41049802008-08-27 12:55:04 +010096 .prepare = pxa_pm_prepare,
97 .finish = pxa_pm_finish,
Eric Miao711be5c2007-07-18 11:38:45 +010098};
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
Robert Jarzmik649de512008-05-02 21:17:06 +0100107 sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
108 GFP_KERNEL);
Eric Miao711be5c2007-07-18 11:38:45 +0100109 if (!sleep_save) {
110 printk(KERN_ERR "failed to alloc memory for pm save\n");
111 return -ENOMEM;
112 }
113
Rafael J. Wysocki26398a72007-10-18 03:04:40 -0700114 suspend_set_ops(&pxa_pm_ops);
Eric Miao711be5c2007-07-18 11:38:45 +0100115 return 0;
116}
117
118device_initcall(pxa_pm_init);