arch/powerpc/include/asm/nvram.h

   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
  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 /* Determine NVRAM size */
 111 extern ssize_t nvram_get_size(void);
 112
 113 /* Normal access to NVRAM */
 114 extern unsigned char nvram_read_byte(int i);
 115 extern void nvram_write_byte(unsigned char c, int i);
 116 #endif
 117
 118 /* Some offsets in XPRAM */
 119 #define PMAC_XPRAM_MACHINE_LOC  0xe4
 120 #define PMAC_XPRAM_SOUND_VOLUME 0x08
 121
 122 /* Machine location structure in PowerMac XPRAM */
 123 struct pmac_machine_location {
 124         unsigned int    latitude;       /* 2+30 bit Fractional number */
 125         unsigned int    longitude;      /* 2+30 bit Fractional number */
 126         unsigned int    delta;          /* mix of GMT delta and DLS */
 127 };
 128
 129 /*
 130  * /dev/nvram ioctls
 131  *
 132  * Note that PMAC_NVRAM_GET_OFFSET is still supported, but is
 133  * definitely obsolete. Do not use it if you can avoid it
 134  */
 135
 136 #define OBSOLETE_PMAC_NVRAM_GET_OFFSET \
 137                                 _IOWR('p', 0x40, int)
 138
 139 #define IOC_NVRAM_GET_OFFSET    _IOWR('p', 0x42, int)   /* Get NVRAM partition offset */
 140 #define IOC_NVRAM_SYNC          _IO('p', 0x43)          /* Sync NVRAM image */
 141
 142 #endif /* _ASM_POWERPC_NVRAM_H */