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
  24 struct err_log_info {
  25         __be32 error_type;
  26         __be32 seq_num;
  27 };
  28
  29 struct 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
  38 struct oops_log_info {
  39         __be16 version;
  40         __be16 report_length;
  41         __be64 timestamp;
  42 } __attribute__((packed));
  43
  44 extern struct nvram_os_partition oops_log_partition;
  45
  46 #ifdef CONFIG_PPC_PSERIES
  47 extern struct nvram_os_partition rtas_log_partition;
  48
  49 extern int nvram_write_error_log(char * buff, int length,
  50                                          unsigned int err_type, unsigned int err_seq);
  51 extern int nvram_read_error_log(char * buff, int length,
  52                                          unsigned int * err_type, unsigned int *err_seq);
  53 extern int nvram_clear_error_log(void);
  54 extern int pSeries_nvram_init(void);
  55 #endif /* CONFIG_PPC_PSERIES */
  56
  57 #ifdef CONFIG_MMIO_NVRAM
  58 extern int mmio_nvram_init(void);
  59 #else
  60 static inline int mmio_nvram_init(void)
  61 {
  62         return -ENODEV;
  63 }
  64 #endif
  65
  66 extern int __init nvram_scan_partitions(void);
  67 extern loff_t nvram_create_partition(const char *name, int sig,
  68                                      int req_size, int min_size);
  69 extern int nvram_remove_partition(const char *name, int sig,
  70                                         const char *exceptions[]);
  71 extern int nvram_get_partition_size(loff_t data_index);
  72 extern loff_t nvram_find_partition(const char *name, int sig, int *out_size);
  73
  74 /* Return partition offset in nvram */
  75 extern int      pmac_get_partition(int partition);
  76
  77 /* Direct access to XPRAM on PowerMacs */
  78 extern u8       pmac_xpram_read(int xpaddr);
  79 extern void     pmac_xpram_write(int xpaddr, u8 data);
  80
  81 /* Synchronize NVRAM */
  82 extern void     nvram_sync(void);
  83
  84 /* Initialize NVRAM OS partition */
  85 extern int __init nvram_init_os_partition(struct nvram_os_partition *part);
  86
  87 /* Initialize NVRAM oops partition */
  88 extern void __init nvram_init_oops_partition(int rtas_partition_exists);
  89
  90 /* Read a NVRAM partition */
  91 extern 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 */
  96 extern 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 */
 102 extern ssize_t nvram_get_size(void);
 103
 104 /* Normal access to NVRAM */
 105 extern unsigned char nvram_read_byte(int i);
 106 extern void nvram_write_byte(unsigned char c, int i);
 107 #endif /* _ASM_POWERPC_NVRAM_H */