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