Current File : //usr/src/linux-headers-5.15.0-43/arch/powerpc/include/asm/nvram.h
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* NVRAM definitions and access functions.
*/
#ifndef _ASM_POWERPC_NVRAM_H
#define _ASM_POWERPC_NVRAM_H
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <uapi/asm/nvram.h>
/*
* Set oops header version to distinguish between old and new format header.
* lnx,oops-log partition max size is 4000, header version > 4000 will
* help in identifying new header.
*/
#define OOPS_HDR_VERSION 5000
struct err_log_info {
__be32 error_type;
__be32 seq_num;
};
struct nvram_os_partition {
const char *name;
int req_size; /* desired size, in bytes */
int min_size; /* minimum acceptable size (0 means req_size) */
long size; /* size of data portion (excluding err_log_info) */
long index; /* offset of data portion of partition */
bool os_partition; /* partition initialized by OS, not FW */
};
struct oops_log_info {
__be16 version;
__be16 report_length;
__be64 timestamp;
} __attribute__((packed));
extern struct nvram_os_partition oops_log_partition;
#ifdef CONFIG_PPC_PSERIES
extern struct nvram_os_partition rtas_log_partition;
extern int nvram_write_error_log(char * buff, int length,
unsigned int err_type, unsigned int err_seq);
extern int nvram_read_error_log(char * buff, int length,
unsigned int * err_type, unsigned int *err_seq);
extern int nvram_clear_error_log(void);
extern int pSeries_nvram_init(void);
#endif /* CONFIG_PPC_PSERIES */
#ifdef CONFIG_MMIO_NVRAM
extern int mmio_nvram_init(void);
#else
static inline int mmio_nvram_init(void)
{
return -ENODEV;
}
#endif
extern int __init nvram_scan_partitions(void);
extern loff_t nvram_create_partition(const char *name, int sig,
int req_size, int min_size);
extern int nvram_remove_partition(const char *name, int sig,
const char *exceptions[]);
extern int nvram_get_partition_size(loff_t data_index);
extern loff_t nvram_find_partition(const char *name, int sig, int *out_size);
/* Return partition offset in nvram */
extern int pmac_get_partition(int partition);
/* Direct access to XPRAM on PowerMacs */
extern u8 pmac_xpram_read(int xpaddr);
extern void pmac_xpram_write(int xpaddr, u8 data);
/* Initialize NVRAM OS partition */
extern int __init nvram_init_os_partition(struct nvram_os_partition *part);
/* Initialize NVRAM oops partition */
extern void __init nvram_init_oops_partition(int rtas_partition_exists);
/* Read a NVRAM partition */
extern int nvram_read_partition(struct nvram_os_partition *part, char *buff,
int length, unsigned int *err_type,
unsigned int *error_log_cnt);
/* Write to NVRAM OS partition */
extern int nvram_write_os_partition(struct nvram_os_partition *part,
char *buff, int length,
unsigned int err_type,
unsigned int error_log_cnt);
#endif /* _ASM_POWERPC_NVRAM_H */
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