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 /* Signatures for nvram partitions */
14 #define NVRAM_SIG_SP 0x02 /* support processor */
15 #define NVRAM_SIG_OF 0x50 /* open firmware config */
16 #define NVRAM_SIG_FW 0x51 /* general firmware */
17 #define NVRAM_SIG_HW 0x52 /* hardware (VPD) */
18 #define NVRAM_SIG_FLIP 0x5a /* Apple flip/flop header */
19 #define NVRAM_SIG_APPL 0x5f /* Apple "system" (???) */
20 #define NVRAM_SIG_SYS 0x70 /* system env vars */
21 #define NVRAM_SIG_CFG 0x71 /* config data */
22 #define NVRAM_SIG_ELOG 0x72 /* error log */
23 #define NVRAM_SIG_VEND 0x7e /* vendor defined */
24 #define NVRAM_SIG_FREE 0x7f /* Free space */
25 #define NVRAM_SIG_OS 0xa0 /* OS defined */
26 #define NVRAM_SIG_PANIC 0xa1 /* Apple OSX "panic" */
27
28 #ifdef __KERNEL__
29
30 #include <linux/errno.h>
31 #include <linux/list.h>
32
33 #ifdef CONFIG_PPC_PSERIES
34 extern int nvram_write_error_log(char * buff, int length,
35 unsigned int err_type, unsigned int err_seq);
36 extern int nvram_read_error_log(char * buff, int length,
37 unsigned int * err_type, unsigned int *err_seq);
38 extern int nvram_clear_error_log(void);
39 extern int pSeries_nvram_init(void);
40 #endif /* CONFIG_PPC_PSERIES */
41
42 #ifdef CONFIG_MMIO_NVRAM
43 extern int mmio_nvram_init(void);
44 #else
mmio_nvram_init(void)45 static inline int mmio_nvram_init(void)
46 {
47 return -ENODEV;
48 }
49 #endif
50
51 extern int __init nvram_scan_partitions(void);
52 extern loff_t nvram_create_partition(const char *name, int sig,
53 int req_size, int min_size);
54 extern int nvram_remove_partition(const char *name, int sig,
55 const char *exceptions[]);
56 extern int nvram_get_partition_size(loff_t data_index);
57 extern loff_t nvram_find_partition(const char *name, int sig, int *out_size);
58
59 #endif /* __KERNEL__ */
60
61 /* PowerMac specific nvram stuffs */
62
63 enum {
64 pmac_nvram_OF, /* Open Firmware partition */
65 pmac_nvram_XPRAM, /* MacOS XPRAM partition */
66 pmac_nvram_NR /* MacOS Name Registry partition */
67 };
68
69 #ifdef __KERNEL__
70 /* Return partition offset in nvram */
71 extern int pmac_get_partition(int partition);
72
73 /* Direct access to XPRAM on PowerMacs */
74 extern u8 pmac_xpram_read(int xpaddr);
75 extern void pmac_xpram_write(int xpaddr, u8 data);
76
77 /* Synchronize NVRAM */
78 extern void nvram_sync(void);
79
80 /* Determine NVRAM size */
81 extern ssize_t nvram_get_size(void);
82
83 /* Normal access to NVRAM */
84 extern unsigned char nvram_read_byte(int i);
85 extern void nvram_write_byte(unsigned char c, int i);
86 #endif
87
88 /* Some offsets in XPRAM */
89 #define PMAC_XPRAM_MACHINE_LOC 0xe4
90 #define PMAC_XPRAM_SOUND_VOLUME 0x08
91
92 /* Machine location structure in PowerMac XPRAM */
93 struct pmac_machine_location {
94 unsigned int latitude; /* 2+30 bit Fractional number */
95 unsigned int longitude; /* 2+30 bit Fractional number */
96 unsigned int delta; /* mix of GMT delta and DLS */
97 };
98
99 /*
100 * /dev/nvram ioctls
101 *
102 * Note that PMAC_NVRAM_GET_OFFSET is still supported, but is
103 * definitely obsolete. Do not use it if you can avoid it
104 */
105
106 #define OBSOLETE_PMAC_NVRAM_GET_OFFSET \
107 _IOWR('p', 0x40, int)
108
109 #define IOC_NVRAM_GET_OFFSET _IOWR('p', 0x42, int) /* Get NVRAM partition offset */
110 #define IOC_NVRAM_SYNC _IO('p', 0x43) /* Sync NVRAM image */
111
112 #endif /* _ASM_POWERPC_NVRAM_H */
113