pcie_gpp.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <acpi/acpi_device.h>
#include <acpi/acpigen.h>
#include <acpi/acpigen_pci.h>
#include <amdblocks/amd_pci_util.h>
#include <assert.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pciexp.h>
#include <soc/pci_devs.h>
#include <stdio.h>
#include <stdlib.h>
 
static const char *pcie_gpp_acpi_name(const struct device *dev)
{
        char *name;
 
        if (dev->path.type != DEVICE_PATH_PCI)
                return NULL;
 
        name = malloc(ACPI_NAME_BUFFER_SIZE);
        snprintf(name, ACPI_NAME_BUFFER_SIZE, "GP%02X", dev->path.pci.devfn);
        name[4] = '\0';
 
        return name;
}
 
static void acpi_device_write_gpp_pci_dev(const struct device *dev)
{
        const char *scope = acpi_device_scope(dev);
        const char *name = acpi_device_name(dev);
 
        assert(dev->path.type == DEVICE_PATH_PCI);
        assert(name);
        assert(scope);
 
        acpigen_write_scope(scope);
        acpigen_write_device(name);
 
        acpigen_write_ADR_pci_device(dev);
        acpigen_write_STA(acpi_device_status(dev));
 
        acpigen_write_pci_GNB_PRT(dev);
 
        acpigen_pop_len(); /* Device */
        acpigen_pop_len(); /* Scope */
}
 
static struct device_operations internal_pcie_gpp_ops = {
        .read_resources         = pci_bus_read_resources,
        .set_resources          = pci_dev_set_resources,
        .enable_resources       = pci_bus_enable_resources,
        .scan_bus               = pci_scan_bridge,
        .reset_bus              = pci_bus_reset,
        .acpi_name              = pcie_gpp_acpi_name,
        .acpi_fill_ssdt         = acpi_device_write_gpp_pci_dev,
};
 
static const unsigned short internal_pci_gpp_ids[] = {
        PCI_DID_AMD_FAM17H_MODEL18H_PCIE_GPP_BUSA,
        PCI_DID_AMD_FAM17H_MODEL18H_PCIE_GPP_BUSB,
        PCI_DID_AMD_FAM17H_MODEL60H_PCIE_GPP_BUSABC,
        PCI_DID_AMD_FAM17H_MODELA0H_PCIE_GPP_BUSABC,
        0
};
 
static const struct pci_driver internal_pcie_gpp_driver __pci_driver = {
        .ops                    = &internal_pcie_gpp_ops,
        .vendor                 = PCI_VID_AMD,
        .devices                = internal_pci_gpp_ids,
};
 
static struct device_operations external_pcie_gpp_ops = {
        .read_resources         = pci_bus_read_resources,
        .set_resources          = pci_dev_set_resources,
        .enable_resources       = pci_bus_enable_resources,
        .scan_bus               = pciexp_scan_bridge,
        .reset_bus              = pci_bus_reset,
        .acpi_name              = pcie_gpp_acpi_name,
        .acpi_fill_ssdt         = acpi_device_write_gpp_pci_dev,
};
 
static const unsigned short external_pci_gpp_ids[] = {
        PCI_DID_AMD_FAM17H_MODEL18H_PCIE_GPP,
        PCI_DID_AMD_FAM17H_MODEL60H_PCIE_GPP_D1,
        PCI_DID_AMD_FAM17H_MODEL60H_PCIE_GPP_D2,
        PCI_DID_AMD_FAM17H_MODELA0H_PCIE_GPP,
        0
};
 
static const struct pci_driver external_pcie_gpp_driver __pci_driver = {
        .ops                    = &external_pcie_gpp_ops,
        .vendor                 = PCI_VID_AMD,
        .devices                = external_pci_gpp_ids,
};