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1/*
2 * NVRAM definitions and access functions.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9#ifndef _ASM_POWERPC_NVRAM_H
10#define _ASM_POWERPC_NVRAM_H
11
12#include <linux/types.h>
13#include <linux/errno.h>
14#include <linux/list.h>
15#include <uapi/asm/nvram.h>
16
17/*
18 * Set oops header version to distinguish between old and new format header.
19 * lnx,oops-log partition max size is 4000, header version > 4000 will
20 * help in identifying new header.
21 */
22#define OOPS_HDR_VERSION 5000
23
24struct err_log_info {
25 __be32 error_type;
26 __be32 seq_num;
27};
28
29struct nvram_os_partition {
30 const char *name;
31 int req_size; /* desired size, in bytes */
32 int min_size; /* minimum acceptable size (0 means req_size) */
33 long size; /* size of data portion (excluding err_log_info) */
34 long index; /* offset of data portion of partition */
35 bool os_partition; /* partition initialized by OS, not FW */
36};
37
38struct oops_log_info {
39 __be16 version;
40 __be16 report_length;
41 __be64 timestamp;
42} __attribute__((packed));
43
44extern struct nvram_os_partition oops_log_partition;
45
46#ifdef CONFIG_PPC_PSERIES
47extern struct nvram_os_partition rtas_log_partition;
48
49extern int nvram_write_error_log(char * buff, int length,
50 unsigned int err_type, unsigned int err_seq);
51extern int nvram_read_error_log(char * buff, int length,
52 unsigned int * err_type, unsigned int *err_seq);
53extern int nvram_clear_error_log(void);
54extern int pSeries_nvram_init(void);
55#endif /* CONFIG_PPC_PSERIES */
56
57#ifdef CONFIG_MMIO_NVRAM
58extern int mmio_nvram_init(void);
59#else
60static inline int mmio_nvram_init(void)
61{
62 return -ENODEV;
63}
64#endif
65
66extern int __init nvram_scan_partitions(void);
67extern loff_t nvram_create_partition(const char *name, int sig,
68 int req_size, int min_size);
69extern int nvram_remove_partition(const char *name, int sig,
70 const char *exceptions[]);
71extern int nvram_get_partition_size(loff_t data_index);
72extern loff_t nvram_find_partition(const char *name, int sig, int *out_size);
73
74/* Return partition offset in nvram */
75extern int pmac_get_partition(int partition);
76
77/* Direct access to XPRAM on PowerMacs */
78extern u8 pmac_xpram_read(int xpaddr);
79extern void pmac_xpram_write(int xpaddr, u8 data);
80
81/* Initialize NVRAM OS partition */
82extern int __init nvram_init_os_partition(struct nvram_os_partition *part);
83
84/* Initialize NVRAM oops partition */
85extern void __init nvram_init_oops_partition(int rtas_partition_exists);
86
87/* Read a NVRAM partition */
88extern int nvram_read_partition(struct nvram_os_partition *part, char *buff,
89 int length, unsigned int *err_type,
90 unsigned int *error_log_cnt);
91
92/* Write to NVRAM OS partition */
93extern int nvram_write_os_partition(struct nvram_os_partition *part,
94 char *buff, int length,
95 unsigned int err_type,
96 unsigned int error_log_cnt);
97
98#endif /* _ASM_POWERPC_NVRAM_H */