src/mainboard/google/storm/mainboard.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright 2014 Google Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <arch/cache.h>
#include <boot/coreboot_tables.h>
#include <device/device.h>

#define TO_MB(x)             ((x)>>20)

/* convenient shorthand (in MB) */
#define DRAM_START           TO_MB(CONFIG_SYS_SDRAM_BASE)
#define DRAM_SIZE            (CONFIG_DRAM_SIZE_MB)
#define DRAM_END             (DRAM_START + DRAM_SIZE)

/* DMA memory for drivers */
#define DMA_START            TO_MB(CONFIG_DRAM_DMA_START)
#define DMA_SIZE             TO_MB(CONFIG_DRAM_DMA_SIZE)

static void setup_mmu(void)
{
	dcache_mmu_disable();

	/* Map Device memory. */
	mmu_config_range(0, DRAM_START, DCACHE_OFF);
	/* Disable Page 0 for trapping NULL pointer references. */
	mmu_disable_range(0, 1);
	/* Map DRAM memory */
	mmu_config_range(DRAM_START, DRAM_SIZE, DCACHE_WRITEBACK);
	/* Map DMA memory */
	if (DMA_SIZE)
		mmu_config_range(DMA_START, DMA_SIZE, DCACHE_OFF);

	mmu_disable_range(DRAM_END, 4096 - DRAM_END);

	mmu_init();

	dcache_mmu_enable();
}

static void mainboard_init(device_t dev)
{
	 setup_mmu();
}

static void mainboard_enable(device_t dev)
{
	dev->ops->init = &mainboard_init;
}

struct chip_operations mainboard_ops = {
	.name	= "storm",
	.enable_dev = mainboard_enable,
};