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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/acpi_device.h>
#include <arch/acpigen.h>
#include <console/console.h>
#include <device/i2c_simple.h>
#include <device/device.h>
#include <device/path.h>
#include <stdint.h>
#include <string.h>
#include "tpm.h"
#include "chip.h"
static void i2c_tpm_fill_ssdt(struct device *dev)
{
struct drivers_i2c_tpm_config *config = dev->chip_info;
const char *scope = acpi_device_scope(dev);
struct acpi_i2c i2c = {
.address = dev->path.i2c.device,
.mode_10bit = dev->path.i2c.mode_10bit,
.speed = config->speed ? : I2C_SPEED_FAST,
.resource = scope,
};
if (!dev->enabled || !scope)
return;
if (!config->hid) {
printk(BIOS_ERR, "%s: ERROR: HID required\n", dev_path(dev));
return;
}
/* Device */
acpigen_write_scope(scope);
acpigen_write_device(acpi_device_name(dev));
acpigen_write_name_string("_HID", config->hid);
acpigen_write_name_integer("_UID", config->uid);
acpigen_write_name_string("_DDN", dev->chip_ops->name);
acpigen_write_STA(acpi_device_status(dev));
/* Resources */
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
acpi_device_write_i2c(&i2c);
if (config->irq_gpio.pin_count)
acpi_device_write_gpio(&config->irq_gpio);
else
acpi_device_write_interrupt(&config->irq);
acpigen_write_resourcetemplate_footer();
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev),
dev->chip_ops->name, dev_path(dev));
}
static const char *i2c_tpm_acpi_name(const struct device *dev)
{
return "TPMI";
}
static struct device_operations i2c_tpm_ops = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
.acpi_name = i2c_tpm_acpi_name,
.acpi_fill_ssdt_generator = i2c_tpm_fill_ssdt,
};
static void i2c_tpm_enable(struct device *dev)
{
struct drivers_i2c_tpm_config *config = dev->chip_info;
dev->ops = &i2c_tpm_ops;
if (config && config->desc) {
dev->name = config->desc;
}
}
struct chip_operations drivers_i2c_tpm_ops = {
CHIP_NAME("I2C TPM")
.enable_dev = i2c_tpm_enable
};
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