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