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
24 struct err_log_info {
25 __be32 error_type;
26 __be32 seq_num;
27 };
28
29 struct 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
38 struct oops_log_info {
39 __be16 version;
40 __be16 report_length;
41 __be64 timestamp;
42 } __attribute__((packed));
43
44 extern struct nvram_os_partition oops_log_partition;
45
46 #ifdef CONFIG_PPC_PSERIES
47 extern struct nvram_os_partition rtas_log_partition;
48
49 extern int nvram_write_error_log(char * buff, int length,
50 unsigned int err_type, unsigned int err_seq);
51 extern int nvram_read_error_log(char * buff, int length,
52 unsigned int * err_type, unsigned int *err_seq);
53 extern int nvram_clear_error_log(void);
54 extern int pSeries_nvram_init(void);
55 #endif /* CONFIG_PPC_PSERIES */
56
57 #ifdef CONFIG_MMIO_NVRAM
58 extern int mmio_nvram_init(void);
59 #else
mmio_nvram_init(void)60 static inline int mmio_nvram_init(void)
61 {
62 return -ENODEV;
63 }
64 #endif
65
66 extern int __init nvram_scan_partitions(void);
67 extern loff_t nvram_create_partition(const char *name, int sig,
68 int req_size, int min_size);
69 extern int nvram_remove_partition(const char *name, int sig,
70 const char *exceptions[]);
71 extern int nvram_get_partition_size(loff_t data_index);
72 extern loff_t nvram_find_partition(const char *name, int sig, int *out_size);
73
74 /* Return partition offset in nvram */
75 extern int pmac_get_partition(int partition);
76
77 /* Direct access to XPRAM on PowerMacs */
78 extern u8 pmac_xpram_read(int xpaddr);
79 extern void pmac_xpram_write(int xpaddr, u8 data);
80
81 /* Synchronize NVRAM */
82 extern void nvram_sync(void);
83
84 /* Initialize NVRAM OS partition */
85 extern int __init nvram_init_os_partition(struct nvram_os_partition *part);
86
87 /* Initialize NVRAM oops partition */
88 extern void __init nvram_init_oops_partition(int rtas_partition_exists);
89
90 /* Read a NVRAM partition */
91 extern int nvram_read_partition(struct nvram_os_partition *part, char *buff,
92 int length, unsigned int *err_type,
93 unsigned int *error_log_cnt);
94
95 /* Write to NVRAM OS partition */
96 extern int nvram_write_os_partition(struct nvram_os_partition *part,
97 char *buff, int length,
98 unsigned int err_type,
99 unsigned int error_log_cnt);
100
101 /* Determine NVRAM size */
102 extern ssize_t nvram_get_size(void);
103
104 /* Normal access to NVRAM */
105 extern unsigned char nvram_read_byte(int i);
106 extern void nvram_write_byte(unsigned char c, int i);
107 #endif /* _ASM_POWERPC_NVRAM_H */
108