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/*
* This file is part of the coreboot project.
*
* Copyright 2016 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.
*/
#include <arch/acpigen.h>
#include <device/device.h>
#include <device/i2c.h>
#include <device/pci.h>
#include <device/pci_def.h>
#include <device/pci_ids.h>
#include <soc/intel/common/lpss_i2c.h>
#include <soc/ramstage.h>
uintptr_t lpss_i2c_base_address(unsigned bus)
{
int devfn;
struct device *dev;
struct resource *res;
/* bus -> devfn */
devfn = i2c_bus_to_devfn(bus);
if (devfn >= 0) {
/* devfn -> dev */
dev = dev_find_slot(0, devfn);
if (dev) {
/* dev -> bar0 */
res = find_resource(dev, PCI_BASE_ADDRESS_0);
if (res)
return res->base;
}
}
return (uintptr_t)NULL;
}
static int i2c_dev_to_bus(struct device *dev)
{
return i2c_devfn_to_bus(dev->path.pci.devfn);
}
/*
* The device should already be enabled and out of reset,
* either from early init in coreboot or SiliconInit in FSP.
*/
static void i2c_dev_init(struct device *dev)
{
struct soc_intel_skylake_config *config = dev->chip_info;
const struct lpss_i2c_speed_config *sptr;
enum i2c_speed speed;
int i, bus = i2c_dev_to_bus(dev);
if (!config || bus < 0)
return;
speed = config->i2c[bus].speed ? : I2C_SPEED_FAST;
lpss_i2c_init(bus, speed);
/* Apply custom speed config if it has been set by the board */
for (i = 0; i < LPSS_I2C_SPEED_CONFIG_COUNT; i++) {
sptr = &config->i2c[bus].speed_config[i];
if (sptr->speed == speed) {
lpss_i2c_set_speed_config(bus, sptr);
break;
}
}
}
/* Generate ACPI I2C device objects */
static void i2c_fill_ssdt(struct device *dev)
{
struct soc_intel_skylake_config *config = dev->chip_info;
int bus = i2c_dev_to_bus(dev);
if (!config || bus < 0)
return;
acpigen_write_scope(acpi_device_path(dev));
lpss_i2c_acpi_fill_ssdt(config->i2c[bus].speed_config);
acpigen_pop_len();
}
static struct i2c_bus_operations i2c_bus_ops = {
.dev_to_bus = &i2c_dev_to_bus,
};
static struct device_operations i2c_dev_ops = {
.read_resources = &pci_dev_read_resources,
.set_resources = &pci_dev_set_resources,
.enable_resources = &pci_dev_enable_resources,
.scan_bus = &scan_smbus,
.ops_pci = &soc_pci_ops,
.ops_i2c_bus = &i2c_bus_ops,
.init = &i2c_dev_init,
.acpi_fill_ssdt_generator = &i2c_fill_ssdt,
};
static const unsigned short pci_device_ids[] = {
0x9d60, 0x9d61, 0x9d62, 0x9d63, 0x9d64, 0x9d65, 0
};
static const struct pci_driver pch_i2c __pci_driver = {
.ops = &i2c_dev_ops,
.vendor = PCI_VENDOR_ID_INTEL,
.devices = pci_device_ids,
};
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