arch/powerpc/include/asm/nvram.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * NVRAM definitions and access functions.
   4  */
   5 #ifndef _ASM_POWERPC_NVRAM_H
   6 #define _ASM_POWERPC_NVRAM_H
   7
   8 #include <linux/types.h>
   9 #include <linux/errno.h>
  10 #include <linux/list.h>
  11 #include <uapi/asm/nvram.h>
  12
  13 /*
  14  * Set oops header version to distinguish between old and new format header.
  15  * lnx,oops-log partition max size is 4000, header version > 4000 will
  16  * help in identifying new header.
  17  */
  18 #define OOPS_HDR_VERSION 5000
  19
  20 struct err_log_info {
  21         __be32 error_type;
  22         __be32 seq_num;
  23 };
  24
  25 struct nvram_os_partition {
  26         const char *name;
  27         int req_size;   /* desired size, in bytes */
  28         int min_size;   /* minimum acceptable size (0 means req_size) */
  29         long size;      /* size of data portion (excluding err_log_info) */
  30         long index;     /* offset of data portion of partition */
  31         bool os_partition; /* partition initialized by OS, not FW */
  32 };
  33
  34 struct oops_log_info {
  35         __be16 version;
  36         __be16 report_length;
  37         __be64 timestamp;
  38 } __attribute__((packed));
  39
  40 extern struct nvram_os_partition oops_log_partition;
  41
  42 #ifdef CONFIG_PPC_PSERIES
  43 extern struct nvram_os_partition rtas_log_partition;
  44
  45 extern int nvram_write_error_log(char * buff, int length,
  46                                          unsigned int err_type, unsigned int err_seq);
  47 extern int nvram_read_error_log(char * buff, int length,
  48                                          unsigned int * err_type, unsigned int *err_seq);
  49 extern int nvram_clear_error_log(void);
  50 extern int pSeries_nvram_init(void);
  51 #endif /* CONFIG_PPC_PSERIES */
  52
  53 #ifdef CONFIG_MMIO_NVRAM
  54 extern int mmio_nvram_init(void);
  55 #else
  56 static inline int mmio_nvram_init(void)
  57 {
  58         return -ENODEV;
  59 }
  60 #endif
  61
  62 extern int __init nvram_scan_partitions(void);
  63 extern loff_t nvram_create_partition(const char *name, int sig,
  64                                      int req_size, int min_size);
  65 extern int nvram_remove_partition(const char *name, int sig,
  66                                         const char *exceptions[]);
  67 extern int nvram_get_partition_size(loff_t data_index);
  68 extern loff_t nvram_find_partition(const char *name, int sig, int *out_size);
  69
  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 /* Initialize NVRAM OS partition */
  78 extern int __init nvram_init_os_partition(struct nvram_os_partition *part);
  79
  80 /* Initialize NVRAM oops partition */
  81 extern void __init nvram_init_oops_partition(int rtas_partition_exists);
  82
  83 /* Read a NVRAM partition */
  84 extern int nvram_read_partition(struct nvram_os_partition *part, char *buff,
  85                                 int length, unsigned int *err_type,
  86                                 unsigned int *error_log_cnt);
  87
  88 /* Write to NVRAM OS partition */
  89 extern int nvram_write_os_partition(struct nvram_os_partition *part,
  90                                     char *buff, int length,
  91                                     unsigned int err_type,
  92                                     unsigned int error_log_cnt);
  93
  94 #endif /* _ASM_POWERPC_NVRAM_H */