src/drivers/intel/ish/ish.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright 2019 Google LLC
 *
 * 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/pci.h>
#include <device/pci_ids.h>
#include "chip.h"

static void ish_fill_ssdt_generator(struct device *dev)
{
	struct drivers_intel_ish_config *config = dev->chip_info;
	struct device *root = dev->bus->dev;
	struct acpi_dp *dsd;

	if (!dev->enabled || !config || !config->firmware_name)
		return;

	acpigen_write_scope(acpi_device_path(root));

	dsd = acpi_dp_new_table("_DSD");
	acpi_dp_add_string(dsd, "firmware-name", config->firmware_name);
	acpi_dp_write(dsd);

	acpigen_pop_len();	/* Scope */

	printk(BIOS_INFO, "%s: Set firmware-name: %s\n",
	       acpi_device_path(root), config->firmware_name);
}

static struct device_operations intel_ish_ops = {
	.read_resources			= DEVICE_NOOP,
	.set_resources			= DEVICE_NOOP,
	.enable_resources		= DEVICE_NOOP,
	.acpi_fill_ssdt_generator	= ish_fill_ssdt_generator,
};

static void intel_ish_enable(struct device *dev)
{
	/* This dev is a generic device that is a child to the ISH PCI device */
	dev->ops = &intel_ish_ops;
}

/* Copy of default_pci_ops_dev with scan_bus addition */
static const struct device_operations pci_ish_device_ops = {
	.read_resources   = pci_dev_read_resources,
	.set_resources    = pci_dev_set_resources,
	.enable_resources = pci_dev_enable_resources,
	.init             = pci_dev_init,
	.scan_bus         = &scan_generic_bus, /* Non-default */
	.ops_pci          = &pci_dev_ops_pci,
};

static const unsigned short pci_device_ids[] = {
	PCI_DEVICE_ID_INTEL_CNL_ISHB,
	0
};

static const struct pci_driver ish_intel_driver __pci_driver = {
	.ops		= &pci_ish_device_ops,
	.vendor		= PCI_VENDOR_ID_INTEL,
	.devices	= pci_device_ids,
};

struct chip_operations drivers_intel_ish_ops = {
	CHIP_NAME("Intel ISH Chip")
	.enable_dev	= intel_ish_enable,
};