tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * PreP compliant NVRAM access
3 * This needs to be updated for PPC64
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
9 */
10
11#ifndef _PPC64_NVRAM_H
12#define _PPC64_NVRAM_H
13
14#define NVRW_CNT 0x20
15#define NVRAM_HEADER_LEN 16 /* sizeof(struct nvram_header) */
16#define NVRAM_BLOCK_LEN 16
17#define NVRAM_MAX_REQ (2080/NVRAM_BLOCK_LEN)
18#define NVRAM_MIN_REQ (1056/NVRAM_BLOCK_LEN)
19
20#define NVRAM_AS0 0x74
21#define NVRAM_AS1 0x75
22#define NVRAM_DATA 0x77
23
24
25/* RTC Offsets */
26
27#define MOTO_RTC_SECONDS 0x1FF9
28#define MOTO_RTC_MINUTES 0x1FFA
29#define MOTO_RTC_HOURS 0x1FFB
30#define MOTO_RTC_DAY_OF_WEEK 0x1FFC
31#define MOTO_RTC_DAY_OF_MONTH 0x1FFD
32#define MOTO_RTC_MONTH 0x1FFE
33#define MOTO_RTC_YEAR 0x1FFF
34#define MOTO_RTC_CONTROLA 0x1FF8
35#define MOTO_RTC_CONTROLB 0x1FF9
36
37#define NVRAM_SIG_SP 0x02 /* support processor */
38#define NVRAM_SIG_OF 0x50 /* open firmware config */
39#define NVRAM_SIG_FW 0x51 /* general firmware */
40#define NVRAM_SIG_HW 0x52 /* hardware (VPD) */
41#define NVRAM_SIG_FLIP 0x5a /* Apple flip/flop header */
42#define NVRAM_SIG_APPL 0x5f /* Apple "system" (???) */
43#define NVRAM_SIG_SYS 0x70 /* system env vars */
44#define NVRAM_SIG_CFG 0x71 /* config data */
45#define NVRAM_SIG_ELOG 0x72 /* error log */
46#define NVRAM_SIG_VEND 0x7e /* vendor defined */
47#define NVRAM_SIG_FREE 0x7f /* Free space */
48#define NVRAM_SIG_OS 0xa0 /* OS defined */
49#define NVRAM_SIG_PANIC 0xa1 /* Apple OSX "panic" */
50
51/* If change this size, then change the size of NVNAME_LEN */
52struct nvram_header {
53 unsigned char signature;
54 unsigned char checksum;
55 unsigned short length;
56 char name[12];
57};
58
59struct nvram_partition {
60 struct list_head partition;
61 struct nvram_header header;
62 unsigned int index;
63};
64
65
66extern int nvram_write_error_log(char * buff, int length, unsigned int err_type);
67extern int nvram_read_error_log(char * buff, int length, unsigned int * err_type);
68extern int nvram_clear_error_log(void);
69extern struct nvram_partition *nvram_find_partition(int sig, const char *name);
70
71extern int pSeries_nvram_init(void);
72extern int pmac_nvram_init(void);
73extern int bpa_nvram_init(void);
74
75/* PowerMac specific nvram stuffs */
76
77enum {
78 pmac_nvram_OF, /* Open Firmware partition */
79 pmac_nvram_XPRAM, /* MacOS XPRAM partition */
80 pmac_nvram_NR /* MacOS Name Registry partition */
81};
82
83/* Return partition offset in nvram */
84extern int pmac_get_partition(int partition);
85
86/* Direct access to XPRAM on PowerMacs */
87extern u8 pmac_xpram_read(int xpaddr);
88extern void pmac_xpram_write(int xpaddr, u8 data);
89
90/* Synchronize NVRAM */
91extern int nvram_sync(void);
92
93/* Some offsets in XPRAM */
94#define PMAC_XPRAM_MACHINE_LOC 0xe4
95#define PMAC_XPRAM_SOUND_VOLUME 0x08
96
97/* Machine location structure in PowerMac XPRAM */
98struct pmac_machine_location {
99 unsigned int latitude; /* 2+30 bit Fractional number */
100 unsigned int longitude; /* 2+30 bit Fractional number */
101 unsigned int delta; /* mix of GMT delta and DLS */
102};
103
104/*
105 * /dev/nvram ioctls
106 *
107 * Note that PMAC_NVRAM_GET_OFFSET is still supported, but is
108 * definitely obsolete. Do not use it if you can avoid it
109 */
110
111#define OBSOLETE_PMAC_NVRAM_GET_OFFSET \
112 _IOWR('p', 0x40, int)
113
114#define IOC_NVRAM_GET_OFFSET _IOWR('p', 0x42, int) /* Get NVRAM partition offset */
115
116#endif /* _PPC64_NVRAM_H */