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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright(c) 2021 Intel Corporation. All rights reserved. */
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include "cxl.h"
static struct acpi_device *to_cxl_host_bridge(struct device *dev)
{
struct acpi_device *adev = to_acpi_device(dev);
if (strcmp(acpi_device_hid(adev), "ACPI0016") == 0)
return adev;
return NULL;
}
static int add_host_bridge_dport(struct device *match, void *arg)
{
int rc;
acpi_status status;
unsigned long long uid;
struct cxl_port *root_port = arg;
struct device *host = root_port->dev.parent;
struct acpi_device *bridge = to_cxl_host_bridge(match);
if (!bridge)
return 0;
status = acpi_evaluate_integer(bridge->handle, METHOD_NAME__UID, NULL,
&uid);
if (status != AE_OK) {
dev_err(host, "unable to retrieve _UID of %s\n",
dev_name(match));
return -ENODEV;
}
rc = cxl_add_dport(root_port, match, uid, CXL_RESOURCE_NONE);
if (rc) {
dev_err(host, "failed to add downstream port: %s\n",
dev_name(match));
return rc;
}
dev_dbg(host, "add dport%llu: %s\n", uid, dev_name(match));
return 0;
}
static int cxl_acpi_probe(struct platform_device *pdev)
{
struct cxl_port *root_port;
struct device *host = &pdev->dev;
struct acpi_device *adev = ACPI_COMPANION(host);
root_port = devm_cxl_add_port(host, host, CXL_RESOURCE_NONE, NULL);
if (IS_ERR(root_port))
return PTR_ERR(root_port);
dev_dbg(host, "add: %s\n", dev_name(&root_port->dev));
return bus_for_each_dev(adev->dev.bus, NULL, root_port,
add_host_bridge_dport);
}
static const struct acpi_device_id cxl_acpi_ids[] = {
{ "ACPI0017", 0 },
{ "", 0 },
};
MODULE_DEVICE_TABLE(acpi, cxl_acpi_ids);
static struct platform_driver cxl_acpi_driver = {
.probe = cxl_acpi_probe,
.driver = {
.name = KBUILD_MODNAME,
.acpi_match_table = cxl_acpi_ids,
},
};
module_platform_driver(cxl_acpi_driver);
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(CXL);
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