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70c3c911cc
The change to avoid searching the device tree does not work on boards
wich don't have driver model set up this early, for example minnowmax.
Put back the old code (converted to livetree) as a fallback for these
devices. Also update the documentation.
This is tested on minnowmax, link, samus and coral.
Fixes: 87f1084a63 (x86: Adjust mrccache_get_region() to use livetree)
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com> (on Intel minnowmax)
105 lines
3 KiB
C
105 lines
3 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 0x100
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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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/* Types of MRC data */
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enum mrc_type_t {
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MRC_TYPE_NORMAL,
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MRC_TYPE_VAR,
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MRC_TYPE_COUNT,
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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_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. This tries to find the SPI flash device
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* (without probing it), falling back to looking for the devicetree node if
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* driver model is not inited or the SPI flash is not found.
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*
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* @type: Type of MRC data to use
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* @devp: Returns pointer to the SPI flash device, if found
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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(enum mrc_type_t type, struct udevice **devp,
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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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/**
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* mrccache_spl_save() - Save to the MRC region from SPL
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*
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* When SPL is used to set up the memory controller we want to save the MRC
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* data in SPL to avoid needing to pass it up to U-Boot proper to save. This
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* function handles that.
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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_spl_save(void);
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#endif /* _ASM_MRCCACHE_H */
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