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