u-boot/arch/x86/include/asm/mrc_common.h
Simon Glass 65dd1507e3 x86: Add common SDRAM-init code
The code to call the memory reference code is common to several Intel CPUs.
Add common code for performing this init. Intel calls this 'Pre-EFI-Init'
(PEI), where EFI stands for Extensible Firmware Interface.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2016-03-17 10:27:27 +08:00

56 lines
1.6 KiB
C

/*
* Copyright (c) 2016 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0
*/
#ifndef __ASM_MRC_COMMON_H
#define __ASM_MRC_COMMON_H
#include <linux/linkage.h>
/**
* mrc_common_init() - Set up SDRAM
*
* This calls the memory reference code (MRC) to set up SDRAM
*
* @dev: Northbridge device
* @pei_data: Platform-specific data required by the MRC
* @use_asm_linkage: true if the call to MRC requires asmlinkage, false if it
* uses normal U-Boot calling
* @return 0 if OK, -ve on error
*/
int mrc_common_init(struct udevice *dev, void *pei_data, bool use_asm_linkage);
asmlinkage void sdram_console_tx_byte(unsigned char byte);
int mrc_locate_spd(struct udevice *dev, int size, const void **spd_datap);
void report_memory_config(void);
/**
* mrc_add_memory_area() - Add a new usable memory area to our list
*
* Note: @start and @end must not span the first 4GB boundary
*
* @info: Place to store memory info
* @start: Start of this memory area
* @end: End of this memory area + 1
*/
int mrc_add_memory_area(struct memory_info *info, uint64_t start,
uint64_t end);
/*
* This function looks for the highest region of memory lower than 4GB which
* has enough space for U-Boot where U-Boot is aligned on a page boundary.
* It overrides the default implementation found elsewhere which simply
* picks the end of ram, wherever that may be. The location of the stack,
* the relocation address, and how far U-Boot is moved by relocation are
* set in the global data structure.
*/
ulong mrc_common_board_get_usable_ram_top(ulong total_size);
void mrc_common_dram_init_banksize(void);
#endif