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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2017 Google
*
* 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/acpi.h>
#include <arch/acpigen.h>
#include <console/console.h>
#include <drivers/i2c/designware/dw_i2c.h>
#include <soc/iomap.h>
#include <soc/pci_devs.h>
#include <soc/southbridge.h>
#include "chip.h"
#define I2C_BUS_ADDRESS(x) (I2C_BASE_ADDRESS + I2C_DEVICE_SIZE * (x))
#define I2CA_BASE_ADDRESS (I2C_BUS_ADDRESS(0))
#define I2CB_BASE_ADDRESS (I2C_BUS_ADDRESS(1))
#define I2CC_BASE_ADDRESS (I2C_BUS_ADDRESS(2))
#define I2CD_BASE_ADDRESS (I2C_BUS_ADDRESS(3))
/* Global to provide access to chip.c */
const char *i2c_acpi_name(const struct device *dev);
static const uintptr_t i2c_bus_address[] = {
I2CA_BASE_ADDRESS,
I2CB_BASE_ADDRESS,
I2CC_BASE_ADDRESS,
I2CD_BASE_ADDRESS,
};
uintptr_t dw_i2c_base_address(unsigned int bus)
{
return bus < I2C_DEVICE_COUNT ? i2c_bus_address[bus] : 0;
}
static const struct soc_amd_stoneyridge_config *get_soc_config(void)
{
const struct device *dev = dev_find_slot(0, GNB_DEVFN);
if (!dev || !dev->chip_info) {
printk(BIOS_ERR, "%s: Could not find SoC devicetree config!\n",
__func__);
return NULL;
}
return dev->chip_info;
}
const struct dw_i2c_bus_config *dw_i2c_get_soc_cfg(unsigned int bus)
{
const struct soc_amd_stoneyridge_config *config;
if (bus >= ARRAY_SIZE(i2c_bus_address))
return NULL;
config = get_soc_config();
if (config == NULL)
return NULL;
return &config->i2c[bus];
}
const char *i2c_acpi_name(const struct device *dev)
{
switch (dev->path.mmio.addr) {
case I2CA_BASE_ADDRESS:
return "I2CA";
case I2CB_BASE_ADDRESS:
return "I2CB";
case I2CC_BASE_ADDRESS:
return "I2CC";
case I2CD_BASE_ADDRESS:
return "I2CD";
default:
return NULL;
}
}
int dw_i2c_soc_dev_to_bus(struct device *dev)
{
switch (dev->path.mmio.addr) {
case I2CA_BASE_ADDRESS:
return 0;
case I2CB_BASE_ADDRESS:
return 1;
case I2CC_BASE_ADDRESS:
return 2;
case I2CD_BASE_ADDRESS:
return 3;
}
return -1;
}
void i2c_soc_early_init(void)
{
size_t i;
const struct soc_amd_stoneyridge_config *config;
config = get_soc_config();
if (config == NULL)
return;
for (i = 0; i < ARRAY_SIZE(config->i2c); i++) {
const struct dw_i2c_bus_config *cfg = &config->i2c[i];
if (!cfg->early_init)
continue;
if (dw_i2c_init(i, cfg))
printk(BIOS_ERR, "Failed to init i2c bus %zd\n", i);
}
}
struct device_operations stoneyridge_i2c_mmio_ops = {
/* TODO(teravest): Move I2C resource info here. */
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
.scan_bus = scan_smbus,
.acpi_name = i2c_acpi_name,
.acpi_fill_ssdt_generator = dw_i2c_acpi_fill_ssdt,
};
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