diff options
Diffstat (limited to 'kernel/power/nvs.c')
-rw-r--r-- | kernel/power/nvs.c | 136 |
1 files changed, 0 insertions, 136 deletions
diff --git a/kernel/power/nvs.c b/kernel/power/nvs.c deleted file mode 100644 index 1836db60bbb6..000000000000 --- a/kernel/power/nvs.c +++ /dev/null | |||
@@ -1,136 +0,0 @@ | |||
1 | /* | ||
2 | * linux/kernel/power/hibernate_nvs.c - Routines for handling NVS memory | ||
3 | * | ||
4 | * Copyright (C) 2008,2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. | ||
5 | * | ||
6 | * This file is released under the GPLv2. | ||
7 | */ | ||
8 | |||
9 | #include <linux/io.h> | ||
10 | #include <linux/kernel.h> | ||
11 | #include <linux/list.h> | ||
12 | #include <linux/mm.h> | ||
13 | #include <linux/slab.h> | ||
14 | #include <linux/suspend.h> | ||
15 | |||
16 | /* | ||
17 | * Platforms, like ACPI, may want us to save some memory used by them during | ||
18 | * suspend and to restore the contents of this memory during the subsequent | ||
19 | * resume. The code below implements a mechanism allowing us to do that. | ||
20 | */ | ||
21 | |||
22 | struct nvs_page { | ||
23 | unsigned long phys_start; | ||
24 | unsigned int size; | ||
25 | void *kaddr; | ||
26 | void *data; | ||
27 | struct list_head node; | ||
28 | }; | ||
29 | |||
30 | static LIST_HEAD(nvs_list); | ||
31 | |||
32 | /** | ||
33 | * suspend_nvs_register - register platform NVS memory region to save | ||
34 | * @start - physical address of the region | ||
35 | * @size - size of the region | ||
36 | * | ||
37 | * The NVS region need not be page-aligned (both ends) and we arrange | ||
38 | * things so that the data from page-aligned addresses in this region will | ||
39 | * be copied into separate RAM pages. | ||
40 | */ | ||
41 | int suspend_nvs_register(unsigned long start, unsigned long size) | ||
42 | { | ||
43 | struct nvs_page *entry, *next; | ||
44 | |||
45 | while (size > 0) { | ||
46 | unsigned int nr_bytes; | ||
47 | |||
48 | entry = kzalloc(sizeof(struct nvs_page), GFP_KERNEL); | ||
49 | if (!entry) | ||
50 | goto Error; | ||
51 | |||
52 | list_add_tail(&entry->node, &nvs_list); | ||
53 | entry->phys_start = start; | ||
54 | nr_bytes = PAGE_SIZE - (start & ~PAGE_MASK); | ||
55 | entry->size = (size < nr_bytes) ? size : nr_bytes; | ||
56 | |||
57 | start += entry->size; | ||
58 | size -= entry->size; | ||
59 | } | ||
60 | return 0; | ||
61 | |||
62 | Error: | ||
63 | list_for_each_entry_safe(entry, next, &nvs_list, node) { | ||
64 | list_del(&entry->node); | ||
65 | kfree(entry); | ||
66 | } | ||
67 | return -ENOMEM; | ||
68 | } | ||
69 | |||
70 | /** | ||
71 | * suspend_nvs_free - free data pages allocated for saving NVS regions | ||
72 | */ | ||
73 | void suspend_nvs_free(void) | ||
74 | { | ||
75 | struct nvs_page *entry; | ||
76 | |||
77 | list_for_each_entry(entry, &nvs_list, node) | ||
78 | if (entry->data) { | ||
79 | free_page((unsigned long)entry->data); | ||
80 | entry->data = NULL; | ||
81 | if (entry->kaddr) { | ||
82 | iounmap(entry->kaddr); | ||
83 | entry->kaddr = NULL; | ||
84 | } | ||
85 | } | ||
86 | } | ||
87 | |||
88 | /** | ||
89 | * suspend_nvs_alloc - allocate memory necessary for saving NVS regions | ||
90 | */ | ||
91 | int suspend_nvs_alloc(void) | ||
92 | { | ||
93 | struct nvs_page *entry; | ||
94 | |||
95 | list_for_each_entry(entry, &nvs_list, node) { | ||
96 | entry->data = (void *)__get_free_page(GFP_KERNEL); | ||
97 | if (!entry->data) { | ||
98 | suspend_nvs_free(); | ||
99 | return -ENOMEM; | ||
100 | } | ||
101 | } | ||
102 | return 0; | ||
103 | } | ||
104 | |||
105 | /** | ||
106 | * suspend_nvs_save - save NVS memory regions | ||
107 | */ | ||
108 | void suspend_nvs_save(void) | ||
109 | { | ||
110 | struct nvs_page *entry; | ||
111 | |||
112 | printk(KERN_INFO "PM: Saving platform NVS memory\n"); | ||
113 | |||
114 | list_for_each_entry(entry, &nvs_list, node) | ||
115 | if (entry->data) { | ||
116 | entry->kaddr = ioremap(entry->phys_start, entry->size); | ||
117 | memcpy(entry->data, entry->kaddr, entry->size); | ||
118 | } | ||
119 | } | ||
120 | |||
121 | /** | ||
122 | * suspend_nvs_restore - restore NVS memory regions | ||
123 | * | ||
124 | * This function is going to be called with interrupts disabled, so it | ||
125 | * cannot iounmap the virtual addresses used to access the NVS region. | ||
126 | */ | ||
127 | void suspend_nvs_restore(void) | ||
128 | { | ||
129 | struct nvs_page *entry; | ||
130 | |||
131 | printk(KERN_INFO "PM: Restoring platform NVS memory\n"); | ||
132 | |||
133 | list_for_each_entry(entry, &nvs_list, node) | ||
134 | if (entry->data) | ||
135 | memcpy(entry->kaddr, entry->data, entry->size); | ||
136 | } | ||