mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-05 18:56:15 +09:00
9a67994e01
When SPL is used to set up the memory controller we want to save the MRC data in SPL to avoid needing to pass it up to U-Boot proper to save. Add a function to handle that. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* Copyright (C) 2014 Google, Inc
|
|
* Copyright (C) 2015 Bin Meng <bmeng.cn@gmail.com>
|
|
*/
|
|
|
|
#ifndef _ASM_MRCCACHE_H
|
|
#define _ASM_MRCCACHE_H
|
|
|
|
#define MRC_DATA_ALIGN 0x1000
|
|
#define MRC_DATA_SIGNATURE (('M' << 0) | ('R' << 8) | \
|
|
('C' << 16) | ('D'<<24))
|
|
|
|
#define MRC_DATA_HEADER_SIZE 32
|
|
|
|
struct __packed mrc_data_container {
|
|
u32 signature; /* "MRCD" */
|
|
u32 data_size; /* Size of the 'data' field */
|
|
u32 checksum; /* IP style checksum */
|
|
u32 reserved; /* For header alignment */
|
|
u8 data[0]; /* Variable size, platform/run time dependent */
|
|
};
|
|
|
|
struct mrc_region {
|
|
u32 base;
|
|
u32 offset;
|
|
u32 length;
|
|
};
|
|
|
|
struct udevice;
|
|
|
|
/**
|
|
* mrccache_find_current() - find the latest MRC cache record
|
|
*
|
|
* This searches the MRC cache region looking for the latest record to use
|
|
* for setting up SDRAM
|
|
*
|
|
* @entry: Position and size of MRC cache in SPI flash
|
|
* @return pointer to latest record, or NULL if none
|
|
*/
|
|
struct mrc_data_container *mrccache_find_current(struct mrc_region *entry);
|
|
|
|
/**
|
|
* mrccache_update() - update the MRC cache with a new record
|
|
*
|
|
* This writes a new record to the end of the MRC cache region. If the new
|
|
* record is the same as the latest record then the write is skipped
|
|
*
|
|
* @sf: SPI flash to write to
|
|
* @entry: Position and size of MRC cache in SPI flash
|
|
* @cur: Record to write
|
|
* @return 0 if updated, -EEXIST if the record is the same as the latest
|
|
* record, -EINVAL if the record is not valid, other error if SPI write failed
|
|
*/
|
|
int mrccache_update(struct udevice *sf, struct mrc_region *entry,
|
|
struct mrc_data_container *cur);
|
|
|
|
/**
|
|
* mrccache_reserve() - reserve MRC data on the stack
|
|
*
|
|
* This copies MRC data pointed by gd->arch.mrc_output to a new place on the
|
|
* stack with length gd->arch.mrc_output_len, and updates gd->arch.mrc_output
|
|
* to point to the new place once the migration is done.
|
|
*
|
|
* This routine should be called by reserve_arch() before U-Boot is relocated
|
|
* when MRC cache is enabled.
|
|
*
|
|
* @return 0 always
|
|
*/
|
|
int mrccache_reserve(void);
|
|
|
|
/**
|
|
* mrccache_get_region() - get MRC region on the SPI flash
|
|
*
|
|
* This gets MRC region whose offset and size are described in the device tree
|
|
* as a subnode to the SPI flash. If a non-NULL device pointer is supplied,
|
|
* this also probes the SPI flash device and returns its device pointer for
|
|
* the caller to use later.
|
|
*
|
|
* Be careful when calling this routine with a non-NULL device pointer:
|
|
* - driver model initialization must be complete
|
|
* - calling in the pre-relocation phase may bring some side effects during
|
|
* the SPI flash device probe (eg: for SPI controllers on a PCI bus, it
|
|
* triggers PCI bus enumeration during which insufficient memory issue
|
|
* might be exposed and it causes subsequent SPI flash probe fails).
|
|
*
|
|
* @devp: Returns pointer to the SPI flash device
|
|
* @entry: Position and size of MRC cache in SPI flash
|
|
* @return 0 if success, -ENOENT if SPI flash node does not exist in the
|
|
* device tree, -EPERM if MRC region subnode does not exist in the device
|
|
* tree, -EINVAL if MRC region properties format is incorrect, other error
|
|
* if SPI flash probe failed.
|
|
*/
|
|
int mrccache_get_region(struct udevice **devp, struct mrc_region *entry);
|
|
|
|
/**
|
|
* mrccache_save() - save MRC data to the SPI flash
|
|
*
|
|
* This saves MRC data stored previously by gd->arch.mrc_output to a proper
|
|
* place within the MRC region on the SPI flash.
|
|
*
|
|
* @return 0 if saved to SPI flash successfully, other error if failed
|
|
*/
|
|
int mrccache_save(void);
|
|
|
|
/**
|
|
* mrccache_spl_save() - Save to the MRC region from SPL
|
|
*
|
|
* When SPL is used to set up the memory controller we want to save the MRC
|
|
* data in SPL to avoid needing to pass it up to U-Boot proper to save. This
|
|
* function handles that.
|
|
*
|
|
* @return 0 if saved to SPI flash successfully, other error if failed
|
|
*/
|
|
int mrccache_spl_save(void);
|
|
|
|
#endif /* _ASM_MRCCACHE_H */
|