LXR linux/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#ifndef _ASM_POWERPC_NVRAM_H
  10#define _ASM_POWERPC_NVRAM_H
  11
  12#include <linux/types.h>
  13#include <linux/errno.h>
  14#include <linux/list.h>
  15#include <uapi/asm/nvram.h>
  16
  17/*
  18 * Set oops header version to distinguish between old and new format header.
  19 * lnx,oops-log partition max size is 4000, header version > 4000 will
  20 * help in identifying new header.
  21 */
  22#define OOPS_HDR_VERSION 5000
  23
  24struct err_log_info {
  25        __be32 error_type;
  26        __be32 seq_num;
  27};
  28
  29struct nvram_os_partition {
  30        const char *name;
  31        int req_size;   /* desired size, in bytes */
  32        int min_size;   /* minimum acceptable size (0 means req_size) */
  33        long size;      /* size of data portion (excluding err_log_info) */
  34        long index;     /* offset of data portion of partition */
  35        bool os_partition; /* partition initialized by OS, not FW */
  36};
  37
  38struct oops_log_info {
  39        __be16 version;
  40        __be16 report_length;
  41        __be64 timestamp;
  42} __attribute__((packed));
  43
  44extern struct nvram_os_partition oops_log_partition;
  45
  46#ifdef CONFIG_PPC_PSERIES
  47extern struct nvram_os_partition rtas_log_partition;
  48
  49extern int nvram_write_error_log(char * buff, int length,
  50                                         unsigned int err_type, unsigned int err_seq);
  51extern int nvram_read_error_log(char * buff, int length,
  52                                         unsigned int * err_type, unsigned int *err_seq);
  53extern int nvram_clear_error_log(void);
  54extern int pSeries_nvram_init(void);
  55#endif /* CONFIG_PPC_PSERIES */
  56
  57#ifdef CONFIG_MMIO_NVRAM
  58extern int mmio_nvram_init(void);
  59#else
  60static inline int mmio_nvram_init(void)
  61{
  62        return -ENODEV;
  63}
  64#endif
  65
  66extern int __init nvram_scan_partitions(void);
  67extern loff_t nvram_create_partition(const char *name, int sig,
  68                                     int req_size, int min_size);
  69extern int nvram_remove_partition(const char *name, int sig,
  70                                        const char *exceptions[]);
  71extern int nvram_get_partition_size(loff_t data_index);
  72extern loff_t nvram_find_partition(const char *name, int sig, int *out_size);
  73
  74/* Return partition offset in nvram */
  75extern int      pmac_get_partition(int partition);
  76
  77/* Direct access to XPRAM on PowerMacs */
  78extern u8       pmac_xpram_read(int xpaddr);
  79extern void     pmac_xpram_write(int xpaddr, u8 data);
  80
  81/* Synchronize NVRAM */
  82extern void     nvram_sync(void);
  83
  84/* Initialize NVRAM OS partition */
  85extern int __init nvram_init_os_partition(struct nvram_os_partition *part);
  86
  87/* Initialize NVRAM oops partition */
  88extern void __init nvram_init_oops_partition(int rtas_partition_exists);
  89
  90/* Read a NVRAM partition */
  91extern int nvram_read_partition(struct nvram_os_partition *part, char *buff,
  92                                int length, unsigned int *err_type,
  93                                unsigned int *error_log_cnt);
  94
  95/* Write to NVRAM OS partition */
  96extern int nvram_write_os_partition(struct nvram_os_partition *part,
  97                                    char *buff, int length,
  98                                    unsigned int err_type,
  99                                    unsigned int error_log_cnt);
 100
 101/* Determine NVRAM size */
 102extern ssize_t nvram_get_size(void);
 103
 104/* Normal access to NVRAM */
 105extern unsigned char nvram_read_byte(int i);
 106extern void nvram_write_byte(unsigned char c, int i);
 107#endif /* _ASM_POWERPC_NVRAM_H */
 108