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
10#ifndef _ASM_POWERPC_NVRAM_H
11#define _ASM_POWERPC_NVRAM_H
12
13#define NVRW_CNT 0x20
14#define NVRAM_HEADER_LEN 16 /* sizeof(struct nvram_header) */
15#define NVRAM_BLOCK_LEN 16
16#define NVRAM_MAX_REQ (2080/NVRAM_BLOCK_LEN)
17#define NVRAM_MIN_REQ (1056/NVRAM_BLOCK_LEN)
18
19#define NVRAM_AS0  0x74
20#define NVRAM_AS1  0x75
21#define NVRAM_DATA 0x77
22
23
24/* RTC Offsets */
25
26#define MOTO_RTC_SECONDS	0x1FF9
27#define MOTO_RTC_MINUTES	0x1FFA
28#define MOTO_RTC_HOURS		0x1FFB
29#define MOTO_RTC_DAY_OF_WEEK	0x1FFC
30#define MOTO_RTC_DAY_OF_MONTH	0x1FFD
31#define MOTO_RTC_MONTH		0x1FFE
32#define MOTO_RTC_YEAR		0x1FFF
33#define MOTO_RTC_CONTROLA       0x1FF8
34#define MOTO_RTC_CONTROLB       0x1FF9
35
36#define NVRAM_SIG_SP	0x02	/* support processor */
37#define NVRAM_SIG_OF	0x50	/* open firmware config */
38#define NVRAM_SIG_FW	0x51	/* general firmware */
39#define NVRAM_SIG_HW	0x52	/* hardware (VPD) */
40#define NVRAM_SIG_FLIP	0x5a	/* Apple flip/flop header */
41#define NVRAM_SIG_APPL	0x5f	/* Apple "system" (???) */
42#define NVRAM_SIG_SYS	0x70	/* system env vars */
43#define NVRAM_SIG_CFG	0x71	/* config data */
44#define NVRAM_SIG_ELOG	0x72	/* error log */
45#define NVRAM_SIG_VEND	0x7e	/* vendor defined */
46#define NVRAM_SIG_FREE	0x7f	/* Free space */
47#define NVRAM_SIG_OS	0xa0	/* OS defined */
48#define NVRAM_SIG_PANIC	0xa1	/* Apple OSX "panic" */
49
50/* If change this size, then change the size of NVNAME_LEN */
51struct nvram_header {
52	unsigned char signature;
53	unsigned char checksum;
54	unsigned short length;
55	char name[12];
56};
57
58#ifdef __KERNEL__
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 mmio_nvram_init(void);
73#endif /* __KERNEL__ */
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#ifdef __KERNEL__
84/* Return partition offset in nvram */
85extern int	pmac_get_partition(int partition);
86
87/* Direct access to XPRAM on PowerMacs */
88extern u8	pmac_xpram_read(int xpaddr);
89extern void	pmac_xpram_write(int xpaddr, u8 data);
90
91/* Synchronize NVRAM */
92extern void	nvram_sync(void);
93
94/* Normal access to NVRAM */
95extern unsigned char nvram_read_byte(int i);
96extern void nvram_write_byte(unsigned char c, int i);
97#endif
98
99/* Some offsets in XPRAM */
100#define PMAC_XPRAM_MACHINE_LOC	0xe4
101#define PMAC_XPRAM_SOUND_VOLUME	0x08
102
103/* Machine location structure in PowerMac XPRAM */
104struct pmac_machine_location {
105	unsigned int	latitude;	/* 2+30 bit Fractional number */
106	unsigned int	longitude;	/* 2+30 bit Fractional number */
107	unsigned int	delta;		/* mix of GMT delta and DLS */
108};
109
110/*
111 * /dev/nvram ioctls
112 *
113 * Note that PMAC_NVRAM_GET_OFFSET is still supported, but is
114 * definitely obsolete. Do not use it if you can avoid it
115 */
116
117#define OBSOLETE_PMAC_NVRAM_GET_OFFSET \
118				_IOWR('p', 0x40, int)
119
120#define IOC_NVRAM_GET_OFFSET	_IOWR('p', 0x42, int)	/* Get NVRAM partition offset */
121#define IOC_NVRAM_SYNC		_IO('p', 0x43)		/* Sync NVRAM image */
122
123#endif /* _ASM_POWERPC_NVRAM_H */
124