src/southbridge/amd/sb700/reset.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2010 - 2011 Advanced Micro Devices, 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.
 */

// Use simple device model for this file even in ramstage
#define __SIMPLE_DEVICE__

#include <arch/io.h>
#include <reset.h>

#define HT_INIT_CONTROL		0x6C
#define HTIC_BIOSR_Detect	(1<<5)

#if CONFIG_MAX_PHYSICAL_CPUS > 32
#define NODE_PCI(x, fn)        ((x<32)?(PCI_DEV(CONFIG_CBB,(CONFIG_CDB+x),fn)):(PCI_DEV((CONFIG_CBB-1),(CONFIG_CDB+x-32),fn)))
#else
#define NODE_PCI(x, fn)        PCI_DEV(CONFIG_CBB,(CONFIG_CDB+x),fn)
#endif

static void set_bios_reset(void)
{
	u32 nodes;
	u32 htic;
	pci_devfn_t dev;
	int i;

	nodes = ((pci_read_config32(PCI_DEV(CONFIG_CBB, CONFIG_CDB, 0), 0x60) >> 4) & 7) + 1;
	for(i = 0; i < nodes; i++) {
		dev = NODE_PCI(i, 0);
		htic = pci_read_config32(dev, HT_INIT_CONTROL);
		htic &= ~HTIC_BIOSR_Detect;
		pci_write_config32(dev, HT_INIT_CONTROL, htic);
	}
}

void hard_reset(void)
{
	set_bios_reset();

	/* Try rebooting through port 0xcf9 */
	/* Actually it is not a real hard_reset
	 * --- it only reset coherent link table, but not reset link freq and width
	 */
	outb((0 << 3) | (0 << 2) | (1 << 1), 0xcf9);
	outb((0 << 3) | (1 << 2) | (1 << 1), 0xcf9);
}

void soft_reset(void)
{
	set_bios_reset();
	/* link reset */
	outb(0x06, 0x0cf9);
}