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 #include <linux/errno.h>
14
15 #define NVRW_CNT 0x20
16 #define NVRAM_HEADER_LEN 16 /* sizeof(struct nvram_header) */
17 #define NVRAM_BLOCK_LEN 16
18 #define NVRAM_MAX_REQ (2080/NVRAM_BLOCK_LEN)
19 #define NVRAM_MIN_REQ (1056/NVRAM_BLOCK_LEN)
20
21 #define NVRAM_AS0 0x74
22 #define NVRAM_AS1 0x75
23 #define NVRAM_DATA 0x77
24
25
26 /* RTC Offsets */
27
28 #define MOTO_RTC_SECONDS 0x1FF9
29 #define MOTO_RTC_MINUTES 0x1FFA
30 #define MOTO_RTC_HOURS 0x1FFB
31 #define MOTO_RTC_DAY_OF_WEEK 0x1FFC
32 #define MOTO_RTC_DAY_OF_MONTH 0x1FFD
33 #define MOTO_RTC_MONTH 0x1FFE
34 #define MOTO_RTC_YEAR 0x1FFF
35 #define MOTO_RTC_CONTROLA 0x1FF8
36 #define MOTO_RTC_CONTROLB 0x1FF9
37
38 #define NVRAM_SIG_SP 0x02 /* support processor */
39 #define NVRAM_SIG_OF 0x50 /* open firmware config */
40 #define NVRAM_SIG_FW 0x51 /* general firmware */
41 #define NVRAM_SIG_HW 0x52 /* hardware (VPD) */
42 #define NVRAM_SIG_FLIP 0x5a /* Apple flip/flop header */
43 #define NVRAM_SIG_APPL 0x5f /* Apple "system" (???) */
44 #define NVRAM_SIG_SYS 0x70 /* system env vars */
45 #define NVRAM_SIG_CFG 0x71 /* config data */
46 #define NVRAM_SIG_ELOG 0x72 /* error log */
47 #define NVRAM_SIG_VEND 0x7e /* vendor defined */
48 #define NVRAM_SIG_FREE 0x7f /* Free space */
49 #define NVRAM_SIG_OS 0xa0 /* OS defined */
50 #define NVRAM_SIG_PANIC 0xa1 /* Apple OSX "panic" */
51
52 /* If change this size, then change the size of NVNAME_LEN */
53 struct nvram_header {
54 unsigned char signature;
55 unsigned char checksum;
56 unsigned short length;
57 char name[12];
58 };
59
60 #ifdef __KERNEL__
61
62 #include <linux/list.h>
63
64 struct nvram_partition {
65 struct list_head partition;
66 struct nvram_header header;
67 unsigned int index;
68 };
69
70
71 extern int nvram_write_error_log(char * buff, int length,
72 unsigned int err_type, unsigned int err_seq);
73 extern int nvram_read_error_log(char * buff, int length,
74 unsigned int * err_type, unsigned int *err_seq);
75 extern int nvram_clear_error_log(void);
76 extern struct nvram_partition *nvram_find_partition(int sig, const char *name);
77
78 extern int pSeries_nvram_init(void);
79
80 #ifdef CONFIG_MMIO_NVRAM
81 extern int mmio_nvram_init(void);
82 #else
mmio_nvram_init(void)83 static inline int mmio_nvram_init(void)
84 {
85 return -ENODEV;
86 }
87 #endif
88
89 #endif /* __KERNEL__ */
90
91 /* PowerMac specific nvram stuffs */
92
93 enum {
94 pmac_nvram_OF, /* Open Firmware partition */
95 pmac_nvram_XPRAM, /* MacOS XPRAM partition */
96 pmac_nvram_NR /* MacOS Name Registry partition */
97 };
98
99 #ifdef __KERNEL__
100 /* Return partition offset in nvram */
101 extern int pmac_get_partition(int partition);
102
103 /* Direct access to XPRAM on PowerMacs */
104 extern u8 pmac_xpram_read(int xpaddr);
105 extern void pmac_xpram_write(int xpaddr, u8 data);
106
107 /* Synchronize NVRAM */
108 extern void nvram_sync(void);
109
110 /* Normal access to NVRAM */
111 extern unsigned char nvram_read_byte(int i);
112 extern void nvram_write_byte(unsigned char c, int i);
113 #endif
114
115 /* Some offsets in XPRAM */
116 #define PMAC_XPRAM_MACHINE_LOC 0xe4
117 #define PMAC_XPRAM_SOUND_VOLUME 0x08
118
119 /* Machine location structure in PowerMac XPRAM */
120 struct pmac_machine_location {
121 unsigned int latitude; /* 2+30 bit Fractional number */
122 unsigned int longitude; /* 2+30 bit Fractional number */
123 unsigned int delta; /* mix of GMT delta and DLS */
124 };
125
126 /*
127 * /dev/nvram ioctls
128 *
129 * Note that PMAC_NVRAM_GET_OFFSET is still supported, but is
130 * definitely obsolete. Do not use it if you can avoid it
131 */
132
133 #define OBSOLETE_PMAC_NVRAM_GET_OFFSET \
134 _IOWR('p', 0x40, int)
135
136 #define IOC_NVRAM_GET_OFFSET _IOWR('p', 0x42, int) /* Get NVRAM partition offset */
137 #define IOC_NVRAM_SYNC _IO('p', 0x43) /* Sync NVRAM image */
138
139 #endif /* _ASM_POWERPC_NVRAM_H */
140