| /* |
| * Copyright (c) 2014 Google, Inc |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #ifndef _ASM_ARCH_MRCCACHE_H |
| #define _ASM_ARCH_MRCCACHE_H |
| |
| #define MRC_DATA_ALIGN 0x1000 |
| #define MRC_DATA_SIGNATURE (('M' << 0) | ('R' << 8) | ('C' << 16) | \ |
| ('D'<<24)) |
| |
| __packed struct mrc_data_container { |
| u32 signature; /* "MRCD" */ |
| u32 data_size; /* Size of the 'data' field */ |
| u32 checksum; /* IP style checksum */ |
| u32 reserved; /* For header alignment */ |
| u8 data[0]; /* Variable size, platform/run time dependent */ |
| }; |
| |
| struct fmap_entry; |
| struct spi_flash; |
| |
| /** |
| * mrccache_find_current() - find the latest MRC cache record |
| * |
| * This searches the MRC cache region looking for the latest record to use |
| * for setting up SDRAM |
| * |
| * @entry: Information about the position and size of the MRC cache |
| * @return pointer to latest record, or NULL if none |
| */ |
| struct mrc_data_container *mrccache_find_current(struct fmap_entry *entry); |
| |
| /** |
| * mrccache_update() - update the MRC cache with a new record |
| * |
| * This writes a new record to the end of the MRC cache. If the new record is |
| * the same as the latest record then the write is skipped |
| * |
| * @sf: SPI flash to write to |
| * @entry: Position and size of MRC cache in SPI flash |
| * @cur: Record to write |
| * @return 0 if updated, -EEXIST if the record is the same as the latest |
| * record, other error if SPI write failed |
| */ |
| int mrccache_update(struct spi_flash *sf, struct fmap_entry *entry, |
| struct mrc_data_container *cur); |
| |
| #endif |
