162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0-or-later */ 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * NVRAM definitions and access functions. 462306a36Sopenharmony_ci */ 562306a36Sopenharmony_ci#ifndef _ASM_POWERPC_NVRAM_H 662306a36Sopenharmony_ci#define _ASM_POWERPC_NVRAM_H 762306a36Sopenharmony_ci 862306a36Sopenharmony_ci#include <linux/types.h> 962306a36Sopenharmony_ci#include <linux/errno.h> 1062306a36Sopenharmony_ci#include <linux/list.h> 1162306a36Sopenharmony_ci#include <uapi/asm/nvram.h> 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci/* 1462306a36Sopenharmony_ci * Set oops header version to distinguish between old and new format header. 1562306a36Sopenharmony_ci * lnx,oops-log partition max size is 4000, header version > 4000 will 1662306a36Sopenharmony_ci * help in identifying new header. 1762306a36Sopenharmony_ci */ 1862306a36Sopenharmony_ci#define OOPS_HDR_VERSION 5000 1962306a36Sopenharmony_ci 2062306a36Sopenharmony_cistruct err_log_info { 2162306a36Sopenharmony_ci __be32 error_type; 2262306a36Sopenharmony_ci __be32 seq_num; 2362306a36Sopenharmony_ci}; 2462306a36Sopenharmony_ci 2562306a36Sopenharmony_cistruct nvram_os_partition { 2662306a36Sopenharmony_ci const char *name; 2762306a36Sopenharmony_ci int req_size; /* desired size, in bytes */ 2862306a36Sopenharmony_ci int min_size; /* minimum acceptable size (0 means req_size) */ 2962306a36Sopenharmony_ci long size; /* size of data portion (excluding err_log_info) */ 3062306a36Sopenharmony_ci long index; /* offset of data portion of partition */ 3162306a36Sopenharmony_ci bool os_partition; /* partition initialized by OS, not FW */ 3262306a36Sopenharmony_ci}; 3362306a36Sopenharmony_ci 3462306a36Sopenharmony_cistruct oops_log_info { 3562306a36Sopenharmony_ci __be16 version; 3662306a36Sopenharmony_ci __be16 report_length; 3762306a36Sopenharmony_ci __be64 timestamp; 3862306a36Sopenharmony_ci} __attribute__((packed)); 3962306a36Sopenharmony_ci 4062306a36Sopenharmony_ciextern struct nvram_os_partition oops_log_partition; 4162306a36Sopenharmony_ci 4262306a36Sopenharmony_ci#ifdef CONFIG_PPC_PSERIES 4362306a36Sopenharmony_ciextern struct nvram_os_partition rtas_log_partition; 4462306a36Sopenharmony_ci 4562306a36Sopenharmony_ciextern int nvram_write_error_log(char * buff, int length, 4662306a36Sopenharmony_ci unsigned int err_type, unsigned int err_seq); 4762306a36Sopenharmony_ciextern int nvram_read_error_log(char * buff, int length, 4862306a36Sopenharmony_ci unsigned int * err_type, unsigned int *err_seq); 4962306a36Sopenharmony_ciextern int nvram_clear_error_log(void); 5062306a36Sopenharmony_ciextern int pSeries_nvram_init(void); 5162306a36Sopenharmony_ci#endif /* CONFIG_PPC_PSERIES */ 5262306a36Sopenharmony_ci 5362306a36Sopenharmony_ci#ifdef CONFIG_MMIO_NVRAM 5462306a36Sopenharmony_ciextern int mmio_nvram_init(void); 5562306a36Sopenharmony_ci#else 5662306a36Sopenharmony_cistatic inline int mmio_nvram_init(void) 5762306a36Sopenharmony_ci{ 5862306a36Sopenharmony_ci return -ENODEV; 5962306a36Sopenharmony_ci} 6062306a36Sopenharmony_ci#endif 6162306a36Sopenharmony_ci 6262306a36Sopenharmony_ciextern int __init nvram_scan_partitions(void); 6362306a36Sopenharmony_ciextern loff_t nvram_create_partition(const char *name, int sig, 6462306a36Sopenharmony_ci int req_size, int min_size); 6562306a36Sopenharmony_ciextern int nvram_remove_partition(const char *name, int sig, 6662306a36Sopenharmony_ci const char *exceptions[]); 6762306a36Sopenharmony_ciextern int nvram_get_partition_size(loff_t data_index); 6862306a36Sopenharmony_ciextern loff_t nvram_find_partition(const char *name, int sig, int *out_size); 6962306a36Sopenharmony_ci 7062306a36Sopenharmony_ci/* Return partition offset in nvram */ 7162306a36Sopenharmony_ciextern int pmac_get_partition(int partition); 7262306a36Sopenharmony_ci 7362306a36Sopenharmony_ci/* Direct access to XPRAM on PowerMacs */ 7462306a36Sopenharmony_ciextern u8 pmac_xpram_read(int xpaddr); 7562306a36Sopenharmony_ciextern void pmac_xpram_write(int xpaddr, u8 data); 7662306a36Sopenharmony_ci 7762306a36Sopenharmony_ci/* Initialize NVRAM OS partition */ 7862306a36Sopenharmony_ciextern int __init nvram_init_os_partition(struct nvram_os_partition *part); 7962306a36Sopenharmony_ci 8062306a36Sopenharmony_ci/* Initialize NVRAM oops partition */ 8162306a36Sopenharmony_ciextern void __init nvram_init_oops_partition(int rtas_partition_exists); 8262306a36Sopenharmony_ci 8362306a36Sopenharmony_ci/* Read a NVRAM partition */ 8462306a36Sopenharmony_ciextern int nvram_read_partition(struct nvram_os_partition *part, char *buff, 8562306a36Sopenharmony_ci int length, unsigned int *err_type, 8662306a36Sopenharmony_ci unsigned int *error_log_cnt); 8762306a36Sopenharmony_ci 8862306a36Sopenharmony_ci/* Write to NVRAM OS partition */ 8962306a36Sopenharmony_ciextern int nvram_write_os_partition(struct nvram_os_partition *part, 9062306a36Sopenharmony_ci char *buff, int length, 9162306a36Sopenharmony_ci unsigned int err_type, 9262306a36Sopenharmony_ci unsigned int error_log_cnt); 9362306a36Sopenharmony_ci 9462306a36Sopenharmony_ci#endif /* _ASM_POWERPC_NVRAM_H */ 95