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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2008-2009 coresystems GmbH
*
* 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.
*/
#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include <device/smbus.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <arch/io.h>
#include "smbus.h"
static void pch_smbus_init(device_t dev)
{
u16 reg16;
/* Enable clock gating */
reg16 = pci_read_config16(dev, 0x80);
reg16 &= ~((1 << 8)|(1 << 10)|(1 << 12)|(1 << 14));
pci_write_config16(dev, 0x80, reg16);
}
static int lsmbus_read_byte(device_t dev, u8 address)
{
u16 device;
struct resource *res;
struct bus *pbus;
device = dev->path.i2c.device;
pbus = get_pbus_smbus(dev);
res = find_resource(pbus->dev, 0x20);
return do_smbus_read_byte(res->base, device, address);
}
static int lsmbus_write_byte(device_t dev, u8 address, u8 val)
{
u16 device;
struct resource *res;
struct bus *pbus;
device = dev->path.i2c.device;
pbus = get_pbus_smbus(dev);
res = find_resource(pbus->dev, 0x20);
return do_smbus_write_byte(res->base, device, address, val);
}
static struct smbus_bus_operations lops_smbus_bus = {
.read_byte = lsmbus_read_byte,
.write_byte = lsmbus_write_byte,
};
static void smbus_set_subsystem(device_t dev, unsigned vendor, unsigned device)
{
if (!vendor || !device) {
pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
pci_read_config32(dev, PCI_VENDOR_ID));
} else {
pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
((device & 0xffff) << 16) | (vendor & 0xffff));
}
}
static struct pci_operations smbus_pci_ops = {
.set_subsystem = smbus_set_subsystem,
};
static void smbus_read_resources(device_t dev)
{
struct resource *res = new_resource(dev, PCI_BASE_ADDRESS_4);
res->base = SMBUS_IO_BASE;
res->size = 32;
res->limit = res->base + res->size - 1;
res->flags = IORESOURCE_IO | IORESOURCE_FIXED | IORESOURCE_RESERVE |
IORESOURCE_STORED | IORESOURCE_ASSIGNED;
/* Also add MMIO resource */
res = pci_get_resource(dev, PCI_BASE_ADDRESS_0);
}
static struct device_operations smbus_ops = {
.read_resources = smbus_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.scan_bus = scan_smbus,
.init = pch_smbus_init,
.ops_smbus_bus = &lops_smbus_bus,
.ops_pci = &smbus_pci_ops,
};
static const unsigned short pci_device_ids[] = { 0x2930, 0 };
static const struct pci_driver pch_smbus __pci_driver = {
.ops = &smbus_ops,
.vendor = PCI_VENDOR_ID_INTEL,
.devices = pci_device_ids,
};
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