mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-05 18:56:15 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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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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#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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