/*
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* Copyright (C) 2014 Google, Inc
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* Copyright (C) 2015 Bin Meng <bmeng.cn@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _ASM_MRCCACHE_H
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#define _ASM_MRCCACHE_H
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#define MRC_DATA_ALIGN 0x1000
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#define MRC_DATA_SIGNATURE (('M' << 0) | ('R' << 8) | \
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('C' << 16) | ('D'<<24))
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#define MRC_DATA_HEADER_SIZE 32
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struct __packed 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 mrc_region {
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u32 base;
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u32 offset;
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u32 length;
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};
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struct udevice;
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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: Position and size of MRC cache in SPI flash
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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 mrc_region *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 region. If the new
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* record is 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, -EINVAL if the record is not valid, other error if SPI write failed
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*/
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int mrccache_update(struct udevice *sf, struct mrc_region *entry,
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struct mrc_data_container *cur);
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/**
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* mrccache_reserve() - reserve MRC data on the stack
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*
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* This copies MRC data pointed by gd->arch.mrc_output to a new place on the
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* stack with length gd->arch.mrc_output_len, and updates gd->arch.mrc_output
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* to point to the new place once the migration is done.
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*
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* This routine should be called by reserve_arch() before U-Boot is relocated
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* when MRC cache is enabled.
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*
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* @return 0 always
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*/
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int mrccache_reserve(void);
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/**
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* mrccache_get_region() - get MRC region on the SPI flash
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*
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* This gets MRC region whose offset and size are described in the device tree
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* as a subnode to the SPI flash. If a non-NULL device pointer is supplied,
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* this also probes the SPI flash device and returns its device pointer for
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* the caller to use later.
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*
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* Be careful when calling this routine with a non-NULL device pointer:
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* - driver model initialization must be complete
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* - calling in the pre-relocation phase may bring some side effects during
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* the SPI flash device probe (eg: for SPI controllers on a PCI bus, it
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* triggers PCI bus enumeration during which insufficient memory issue
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* might be exposed and it causes subsequent SPI flash probe fails).
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*
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* @devp: Returns pointer to the SPI flash device
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* @entry: Position and size of MRC cache in SPI flash
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* @return 0 if success, -ENOENT if SPI flash node does not exist in the
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* device tree, -EPERM if MRC region subnode does not exist in the device
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* tree, -EINVAL if MRC region properties format is incorrect, other error
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* if SPI flash probe failed.
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*/
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int mrccache_get_region(struct udevice **devp, struct mrc_region *entry);
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/**
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* mrccache_save() - save MRC data to the SPI flash
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*
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* This saves MRC data stored previously by gd->arch.mrc_output to a proper
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* place within the MRC region on the SPI flash.
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*
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* @return 0 if saved to SPI flash successfully, other error if failed
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*/
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int mrccache_save(void);
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#endif /* _ASM_MRCCACHE_H */
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