src/soc/intel/fsp_broadwell_de/smbus.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2008-2009 coresystems GmbH
 * Copyright (C) 2014 Google Inc.
 * Copyright (C) 2016 Siemens AG
 *
 * 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.
 */

#include <arch/io.h>
#include <console/console.h>
#include <device/device.h>
#include <device/smbus.h>
#include <device/smbus_def.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <soc/pci_devs.h>
#include <soc/smbus.h>

static void pch_smbus_init(struct device *dev)
{
	struct resource *res;

	/* Set Receive Slave Address */
	res = find_resource(dev, PCI_BASE_ADDRESS_4);
	if (res)
		outb(SMBUS_SLAVE_ADDR, res->base + SMB_RCV_SLVA);
}

static void pch_smbus_enable(struct device *dev)
{
	uint8_t reg8;

	reg8 = pci_read_config8(dev, HOSTC);
	reg8 |= HST_EN;
	pci_write_config8(dev, HOSTC, reg8);
}

static int lsmbus_read_byte(struct device *dev, uint8_t address)
{
	uint16_t device;
	struct resource *res;
	struct bus *pbus;

	device = dev->path.i2c.device;
	pbus = get_pbus_smbus(dev);
	res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4);

	return do_smbus_read_byte(res->base, device, address);
}

static int lsmbus_write_byte(struct device *dev, uint8_t address, uint8_t data)
{
	uint16_t device;
	struct resource *res;
	struct bus *pbus;

	device = dev->path.i2c.device;
	pbus = get_pbus_smbus(dev);
	res = find_resource(pbus->dev, PCI_BASE_ADDRESS_4);
	return do_smbus_write_byte(res->base, device, address, data);
}

static struct smbus_bus_operations lops_smbus_bus = {
	.read_byte	= lsmbus_read_byte,
	.write_byte	= lsmbus_write_byte,
};

static struct device_operations smbus_ops = {
	.read_resources		= &pci_dev_read_resources,
	.set_resources		= &pci_dev_set_resources,
	.enable_resources	= &pci_dev_enable_resources,
	.scan_bus		= &scan_smbus,
	.init			= &pch_smbus_init,
	.enable			= &pch_smbus_enable,
	.ops_smbus_bus		= &lops_smbus_bus,
};

static const unsigned short pci_device_ids[] = {
	SMBUS_DEVID,
	0
};

static const struct pci_driver pch_smbus __pci_driver = {
	.ops	 = &smbus_ops,
	.vendor	 = PCI_VENDOR_ID_INTEL,
	.devices = pci_device_ids,
};