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 */ 95