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1/*
2 * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
3 * Copyright (C) 2011 Kees Cook <keescook@chromium.org>
4 * Copyright (C) 2011 Google, Inc.
5 *
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16
17#ifndef __LINUX_PSTORE_RAM_H__
18#define __LINUX_PSTORE_RAM_H__
19
20#include <linux/device.h>
21#include <linux/kernel.h>
22#include <linux/list.h>
23#include <linux/types.h>
24#include <linux/init.h>
25
26struct persistent_ram_buffer;
27
28struct persistent_ram_descriptor {
29 const char *name;
30 phys_addr_t size;
31};
32
33struct persistent_ram {
34 phys_addr_t start;
35 phys_addr_t size;
36
37 int num_descs;
38 struct persistent_ram_descriptor *descs;
39
40 struct list_head node;
41};
42
43struct persistent_ram_zone {
44 phys_addr_t paddr;
45 size_t size;
46 void *vaddr;
47 struct persistent_ram_buffer *buffer;
48 size_t buffer_size;
49
50 /* ECC correction */
51 bool ecc;
52 char *par_buffer;
53 char *par_header;
54 struct rs_control *rs_decoder;
55 int corrected_bytes;
56 int bad_blocks;
57 int ecc_block_size;
58 int ecc_size;
59 int ecc_symsize;
60 int ecc_poly;
61
62 char *old_log;
63 size_t old_log_size;
64};
65
66int persistent_ram_early_init(struct persistent_ram *ram);
67
68struct persistent_ram_zone * __init persistent_ram_new(phys_addr_t start,
69 size_t size,
70 bool ecc);
71void persistent_ram_free(struct persistent_ram_zone *prz);
72struct persistent_ram_zone *persistent_ram_init_ringbuffer(struct device *dev,
73 bool ecc);
74
75int persistent_ram_write(struct persistent_ram_zone *prz, const void *s,
76 unsigned int count);
77
78size_t persistent_ram_old_size(struct persistent_ram_zone *prz);
79void *persistent_ram_old(struct persistent_ram_zone *prz);
80void persistent_ram_free_old(struct persistent_ram_zone *prz);
81ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
82 char *str, size_t len);
83
84/*
85 * Ramoops platform data
86 * @mem_size memory size for ramoops
87 * @mem_address physical memory address to contain ramoops
88 */
89
90struct ramoops_platform_data {
91 unsigned long mem_size;
92 unsigned long mem_address;
93 unsigned long record_size;
94 int dump_oops;
95 bool ecc;
96};
97
98#endif