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/*
* This file is part of the coreboot project.
*
* Copyright 2017 Intel Corporation.
*
* 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/i2c.h>
#include <device/pci.h>
#include <device/pci_def.h>
#include <device/pci_ids.h>
#include <intelblocks/lpss_i2c.h>
#include "lpss_i2c.h"
static int lpss_i2c_dev_to_bus(struct device *dev)
{
pci_devfn_t devfn = dev->path.pci.devfn;
return i2c_soc_devfn_to_bus(devfn);
}
uintptr_t lpss_i2c_base_address(unsigned int bus)
{
int devfn;
struct device *dev;
struct resource *res;
/* bus -> devfn */
devfn = i2c_soc_bus_to_devfn(bus);
if (devfn < 0)
return (uintptr_t)NULL;
/* devfn -> dev */
dev = dev_find_slot(0, devfn);
if (!dev)
return (uintptr_t)NULL;
/* dev -> bar0 */
res = find_resource(dev, PCI_BASE_ADDRESS_0);
if (res)
return res->base;
return (uintptr_t)NULL;
}
/*
* Write ACPI object to describe speed configuration.
*
* ACPI Object: Name ("xxxx", Package () { scl_lcnt, scl_hcnt, sda_hold }
*
* SSCN: I2C_SPEED_STANDARD
* FMCN: I2C_SPEED_FAST
* FPCN: I2C_SPEED_FAST_PLUS
* HSCN: I2C_SPEED_HIGH
*/
static void lpss_i2c_acpi_write_speed_config(
const struct lpss_i2c_speed_config *config)
{
if (!config)
return;
if (!config->scl_lcnt && !config->scl_hcnt && !config->sda_hold)
return;
if (config->speed >= I2C_SPEED_HIGH)
acpigen_write_name("HSCN");
else if (config->speed >= I2C_SPEED_FAST_PLUS)
acpigen_write_name("FPCN");
else if (config->speed >= I2C_SPEED_FAST)
acpigen_write_name("FMCN");
else
acpigen_write_name("SSCN");
/* Package () { scl_lcnt, scl_hcnt, sda_hold } */
acpigen_write_package(3);
acpigen_write_word(config->scl_hcnt);
acpigen_write_word(config->scl_lcnt);
acpigen_write_dword(config->sda_hold);
acpigen_pop_len();
}
/*
* The device should already be enabled and out of reset,
* either from early init in coreboot or SiliconInit in FSP.
*/
static void lpss_i2c_dev_init(struct device *dev)
{
const struct lpss_i2c_bus_config *config;
int bus = lpss_i2c_dev_to_bus(dev);
config = i2c_get_soc_cfg(bus, dev);
if (!config || bus < 0)
return;
lpss_i2c_init(bus, config);
}
/*
* Generate I2C timing information into the SSDT for the OS driver to consume,
* optionally applying override values provided by the caller.
*/
static void lpss_i2c_acpi_fill_ssdt(struct device *dev)
{
const struct lpss_i2c_bus_config *bcfg;
struct lpss_i2c_regs *regs;
struct lpss_i2c_speed_config sgen;
enum i2c_speed speeds[LPSS_I2C_SPEED_CONFIG_COUNT] = {
I2C_SPEED_STANDARD,
I2C_SPEED_FAST,
I2C_SPEED_FAST_PLUS,
I2C_SPEED_HIGH,
};
int i, bus = lpss_i2c_dev_to_bus(dev);
bcfg = i2c_get_soc_cfg(bus, dev);
if (!bcfg)
return;
regs = (struct lpss_i2c_regs *)lpss_i2c_base_address(bus);
if (!regs)
return;
acpigen_write_scope(acpi_device_path(dev));
/* Report timing values for the OS driver */
for (i = 0; i < LPSS_I2C_SPEED_CONFIG_COUNT; i++) {
/* Generate speed config. */
if (lpss_i2c_gen_speed_config(regs, speeds[i], bcfg, &sgen) < 0)
continue;
/* Generate ACPI based on selected speed config */
lpss_i2c_acpi_write_speed_config(&sgen);
}
acpigen_pop_len();
}
static struct i2c_bus_operations i2c_bus_ops = {
.dev_to_bus = &lpss_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_i2c_bus = &i2c_bus_ops,
.init = &lpss_i2c_dev_init,
.acpi_fill_ssdt_generator = &lpss_i2c_acpi_fill_ssdt,
};
static const unsigned short pci_device_ids[] = {
PCI_DEVICE_ID_INTEL_SPT_I2C0,
PCI_DEVICE_ID_INTEL_SPT_I2C1,
PCI_DEVICE_ID_INTEL_SPT_I2C2,
PCI_DEVICE_ID_INTEL_SPT_I2C3,
PCI_DEVICE_ID_INTEL_SPT_I2C4,
PCI_DEVICE_ID_INTEL_SPT_I2C5,
PCI_DEVICE_ID_INTEL_APL_I2C0,
PCI_DEVICE_ID_INTEL_APL_I2C1,
PCI_DEVICE_ID_INTEL_APL_I2C2,
PCI_DEVICE_ID_INTEL_APL_I2C3,
PCI_DEVICE_ID_INTEL_APL_I2C4,
PCI_DEVICE_ID_INTEL_APL_I2C5,
PCI_DEVICE_ID_INTEL_APL_I2C6,
PCI_DEVICE_ID_INTEL_APL_I2C7,
};
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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