1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
/*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* Tomasz Figa <t.figa@samsung.com>
* Copyright (C) 2008 Openmoko, Inc.
* Copyright (C) 2004-2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* Samsung common power management helper functions.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/io.h>
#include <linux/kernel.h>
#include <plat/pm-common.h>
/* helper functions to save and restore register state */
/**
* s3c_pm_do_save() - save a set of registers for restoration on resume.
* @ptr: Pointer to an array of registers.
* @count: Size of the ptr array.
*
* Run through the list of registers given, saving their contents in the
* array for later restoration when we wakeup.
*/
void s3c_pm_do_save(struct sleep_save *ptr, int count)
{
for (; count > 0; count--, ptr++) {
ptr->val = readl_relaxed(ptr->reg);
S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
}
}
/**
* s3c_pm_do_restore() - restore register values from the save list.
* @ptr: Pointer to an array of registers.
* @count: Size of the ptr array.
*
* Restore the register values saved from s3c_pm_do_save().
*
* Note, we do not use S3C_PMDBG() in here, as the system may not have
* restore the UARTs state yet
*/
void s3c_pm_do_restore(const struct sleep_save *ptr, int count)
{
for (; count > 0; count--, ptr++) {
pr_debug("restore %p (restore %08lx, was %08x)\n",
ptr->reg, ptr->val, readl_relaxed(ptr->reg));
writel_relaxed(ptr->val, ptr->reg);
}
}
/**
* s3c_pm_do_restore_core() - early restore register values from save list.
*
* This is similar to s3c_pm_do_restore() except we try and minimise the
* side effects of the function in case registers that hardware might need
* to work has been restored.
*
* WARNING: Do not put any debug in here that may effect memory or use
* peripherals, as things may be changing!
*/
void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count)
{
for (; count > 0; count--, ptr++)
writel_relaxed(ptr->val, ptr->reg);
}
|
