pcie.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <acpi/acpigen.h>
#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include <string.h>
#include "chip.h"
 
#define PCI_HOTPLUG_IN_D3_UUID  "6211E2C0-58A3-4AF3-90E1-927A4E0C55A4"
#define PCI_EXTERNAL_PORT_UUID  "EFCC06CC-73AC-4BC3-BFF0-76143807C389"
 
#if CONFIG(HAVE_ACPI_TABLES)
static void usb4_pcie_acpi_fill_ssdt(const struct device *dev)
{
        const struct soc_intel_common_block_usb4_config *config;
        const struct device *parent;
        struct acpi_dp *dsd, *pkg;
        const char *usb4_path;
        int port_id;
 
        /* Get parent PCI device */
        parent = dev->bus->dev;
        if (!parent) {
                printk(BIOS_ERR, "%s: Unable to find parent device\n", __func__);
                return;
        }
 
        if (!parent->enabled)
                return;
 
        config = config_of(dev);
        if (!config->usb4_port) {
                printk(BIOS_ERR, "%s: Unable to find reference to usb4_port\n", __func__);
                return;
        }
 
        /* Get ACPI path to USB4 device. */
        usb4_path = acpi_device_path(config->usb4_port);
        if (!usb4_path) {
                printk(BIOS_ERR, "%s: Unable to find ACPI path for usb4_port %s\n",
                       __func__, dev_path(config->usb4_port));
                return;
        }
 
        usb4_path = strdup(usb4_path);
        port_id = dev->path.generic.id;
 
        acpigen_write_scope(acpi_device_path(parent));
 
        /* Add pointer to USB4 port controller. */
        dsd = acpi_dp_new_table("_DSD");
        acpi_dp_add_reference(dsd, "usb4-host-interface", usb4_path);
        acpi_dp_add_integer(dsd, "usb4-port-number", port_id);
 
        /* Indicate that device supports hotplug in D3. */
        pkg = acpi_dp_new_table(PCI_HOTPLUG_IN_D3_UUID);
        acpi_dp_add_integer(pkg, "HotPlugSupportInD3", 1);
        acpi_dp_add_package(dsd, pkg);
 
        /* Indicate that port is external. */
        pkg = acpi_dp_new_table(PCI_EXTERNAL_PORT_UUID);
        acpi_dp_add_integer(pkg, "ExternalFacingPort", 1);
 
        acpi_dp_add_package(dsd, pkg);
        acpi_dp_write(dsd);
 
        acpigen_pop_len(); /* Scope */
 
        printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(parent),
               config->desc ? : dev->chip_ops->name, dev_path(parent));
}
#endif
 
static struct device_operations usb4_pcie_acpi_dev_ops = {
        .read_resources         = noop_read_resources,
        .set_resources          = noop_set_resources,
#if CONFIG(HAVE_ACPI_TABLES)
        .acpi_fill_ssdt         = usb4_pcie_acpi_fill_ssdt,
#endif
};
 
static void usb4_pcie_acpi_enable(struct device *dev)
{
        dev->ops = &usb4_pcie_acpi_dev_ops;
}
 
struct chip_operations soc_intel_common_block_usb4_ops = {
        CHIP_NAME("Intel USB4 PCIe Root Port")
        .enable_dev = usb4_pcie_acpi_enable
};