src/northbridge/amd/amdfam10/nb_control.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
 *
 * 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
 */

/* Configure various power control registers, including processor boost
 * and TDP monitoring support.
 */

#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <pc80/mc146818rtc.h>
#include <lib.h>
#include <cpu/amd/model_10xxx_rev.h>

#include "amdfam10.h"

static void nb_control_init(struct device *dev)
{
	uint32_t dword;
	uint32_t f5x80;
	uint8_t cu_enabled;
	uint8_t compute_unit_count = 0;

	printk(BIOS_DEBUG, "NB: Function 5 Northbridge Control.. ");

	/* Determine the number of active compute units on this node */
	f5x80 = pci_read_config32(dev, 0x80);
	cu_enabled = f5x80 & 0xf;
	if (cu_enabled == 0x1)
		compute_unit_count = 1;
	if (cu_enabled == 0x3)
		compute_unit_count = 2;
	if (cu_enabled == 0x7)
		compute_unit_count = 3;
	if (cu_enabled == 0xf)
		compute_unit_count = 4;

	/* Configure Processor TDP Running Average */
	dword = pci_read_config32(dev, 0xe0);
	dword &= ~0xf;				/* RunAvgRange = 0x9 */
	dword |= 0x9;
	pci_write_config32(dev, 0xe0, dword);

	/* Configure northbridge P-states */
	dword = pci_read_config32(dev, 0xe0);
	dword &= ~(0x7 << 9);			/* NbPstateThreshold = compute_unit_count */
	dword |= (compute_unit_count & 0x7) << 9;
	pci_write_config32(dev, 0xe0, dword);

	printk(BIOS_DEBUG, "done.\n");
}


static struct device_operations mcf5_ops  = {
	.read_resources   = pci_dev_read_resources,
	.set_resources    = pci_dev_set_resources,
	.enable_resources = pci_dev_enable_resources,
	.init             = nb_control_init,
	.scan_bus         = 0,
	.ops_pci          = 0,
};

static const struct pci_driver mcf5_driver_fam15 __pci_driver = {
	.ops    = &mcf5_ops,
	.vendor = PCI_VENDOR_ID_AMD,
	.device = 0x1605,
};