[people/ms/u-boot.git] / arch / x86 / cpu / qemu / dram.c

/*
 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/post.h>
#include <asm/arch/qemu.h>

DECLARE_GLOBAL_DATA_PTR;

int dram_init(void)
{
	u32 ram;

	outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT);
	ram = ((u32)inb(CMOS_DATA_PORT)) << 14;
	outb(LOW_RAM_ADDR, CMOS_ADDR_PORT);
	ram |= ((u32)inb(CMOS_DATA_PORT)) << 6;
	ram += 16 * 1024;

	gd->ram_size = ram * 1024;
	post_code(POST_DRAM);

	return 0;
}

int dram_init_banksize(void)
{
	gd->bd->bi_dram[0].start = 0;
	gd->bd->bi_dram[0].size = gd->ram_size;

	return 0;
}

/*
 * 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 board_get_usable_ram_top(ulong total_size)
{
	return gd->ram_size;
}
Commit	Line	Data
a65b25d1 BM	1	/*
	2	* Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
	3	*
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
	7	#include <common.h>
	8	#include <asm/post.h>
	9	#include <asm/arch/qemu.h>
	10
	11	DECLARE_GLOBAL_DATA_PTR;
	12
	13	int dram_init(void)
	14	{
	15	u32 ram;
	16
	17	outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT);
	18	ram = ((u32)inb(CMOS_DATA_PORT)) << 14;
	19	outb(LOW_RAM_ADDR, CMOS_ADDR_PORT);
	20	ram \|= ((u32)inb(CMOS_DATA_PORT)) << 6;
	21	ram += 16 * 1024;
	22
	23	gd->ram_size = ram * 1024;
	24	post_code(POST_DRAM);
	25
	26	return 0;
	27	}
	28
76b00aca	29	int dram_init_banksize(void)
a65b25d1 BM	30	{
	31	gd->bd->bi_dram[0].start = 0;
	32	gd->bd->bi_dram[0].size = gd->ram_size;
76b00aca SG	33
76b00aca SG	34	return 0;
a65b25d1 BM	35	}
	36
	37	/*
	38	* This function looks for the highest region of memory lower than 4GB which
	39	* has enough space for U-Boot where U-Boot is aligned on a page boundary.
	40	* It overrides the default implementation found elsewhere which simply
	41	* picks the end of ram, wherever that may be. The location of the stack,
	42	* the relocation address, and how far U-Boot is moved by relocation are
	43	* set in the global data structure.
	44	*/
	45	ulong board_get_usable_ram_top(ulong total_size)
	46	{
	47	return gd->ram_size;
	48	}