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Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/include/asm/nvram.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/nvram.h b/arch/powerpc/include/asm/nvram.h new file mode 100644 index 000000000..eda7fac35 --- /dev/null +++ b/arch/powerpc/include/asm/nvram.h @@ -0,0 +1,94 @@ +/* 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 */ |