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 /* 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
  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 */