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https://github.com/brain-hackers/u-boot-brain
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ed800961a0
This adds mrccache_reserve(), mrccache_get_region() and mrccache_save() APIs to the mrccache codes. They are ported from the ivybridge implementation, but with some changes. For example, in the mrccache_reserve(), ivybridge version only reserves the pure MRC data, which causes additional malloc() when saving the cache as the save API needs some meta data. Now we change it to save the whole MRC date plus the meta data to elinimate the need for the malloc() later. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Acked-by: Simon Glass <sjg@chromium.org>
103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
/*
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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 fmap_entry;
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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 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 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 fmap_entry *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 fmap_entry *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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