--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AMD Promontory 21 xHCI host controller PCI Bus Glue.
+ *
+ * This does not add any PROM21-specific USB or xHCI operation. It exists only
+ * to publish an auxiliary device for integrated temperature sensor support.
+ *
+ * Copyright (C) 2026 Jihong Min <hurryman2212@gmail.com>
+ */
+
+#include <linux/auxiliary_bus.h>
+#include <linux/device/devres.h>
+#include <linux/errno.h>
+#include <linux/idr.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/platform_data/usb-xhci-prom21.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "xhci-pci.h"
+
+struct prom21_xhci_auxdev {
+ struct auxiliary_device *auxdev;
+ struct prom21_xhci_pdata pdata;
+ int id;
+};
+
+static DEFINE_IDA(prom21_xhci_auxdev_ida);
+
+static void prom21_xhci_auxdev_release(struct device *dev, void *res)
+{
+ struct prom21_xhci_auxdev *prom21_auxdev = res;
+
+ auxiliary_device_destroy(prom21_auxdev->auxdev);
+ ida_free(&prom21_xhci_auxdev_ida, prom21_auxdev->id);
+}
+
+static int prom21_xhci_create_auxdev(struct pci_dev *pdev)
+{
+ struct prom21_xhci_auxdev *prom21_auxdev;
+ struct usb_hcd *hcd = pci_get_drvdata(pdev);
+ int ret;
+
+ prom21_auxdev = devres_alloc(prom21_xhci_auxdev_release,
+ sizeof(*prom21_auxdev), GFP_KERNEL);
+ if (!prom21_auxdev)
+ return -ENOMEM;
+
+ prom21_auxdev->pdata.pdev = pdev;
+ prom21_auxdev->pdata.regs = hcd->regs;
+ prom21_auxdev->pdata.rsrc_len = hcd->rsrc_len;
+
+ prom21_auxdev->id = ida_alloc(&prom21_xhci_auxdev_ida, GFP_KERNEL);
+ if (prom21_auxdev->id < 0) {
+ ret = prom21_auxdev->id;
+ goto err_free_devres;
+ }
+
+ prom21_auxdev->auxdev = auxiliary_device_create(&pdev->dev,
+ KBUILD_MODNAME, "hwmon",
+ &prom21_auxdev->pdata,
+ prom21_auxdev->id);
+ if (!prom21_auxdev->auxdev) {
+ ret = -ENOMEM;
+ goto err_free_ida;
+ }
+
+ devres_add(&pdev->dev, prom21_auxdev);
+ return 0;
+
+err_free_ida:
+ ida_free(&prom21_xhci_auxdev_ida, prom21_auxdev->id);
+err_free_devres:
+ devres_free(prom21_auxdev);
+ return ret;
+}
+
+static void prom21_xhci_destroy_auxdev(struct pci_dev *pdev)
+{
+ devres_release(&pdev->dev, prom21_xhci_auxdev_release, NULL, NULL);
+}
+
+static int prom21_xhci_probe(struct pci_dev *dev,
+ const struct pci_device_id *id)
+{
+ int retval;
+
+ retval = xhci_pci_common_probe(dev, id);
+ if (retval)
+ return retval;
+
+ retval = prom21_xhci_create_auxdev(dev);
+ if (retval) {
+ /*
+ * The auxiliary device only provides optional temperature sensor
+ * support. Keep the xHCI controller usable if it fails.
+ */
+ dev_err(&dev->dev,
+ "failed to create PROM21 hwmon auxiliary device: %d\n",
+ retval);
+ }
+
+ return 0;
+}
+
+static void prom21_xhci_remove(struct pci_dev *dev)
+{
+ prom21_xhci_destroy_auxdev(dev);
+ xhci_pci_remove(dev);
+}
+
+static const struct pci_device_id pci_ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_PROM21_XHCI_43FC) },
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_PROM21_XHCI_43FD) },
+ { /* end: all zeroes */ }
+};
+MODULE_DEVICE_TABLE(pci, pci_ids);
+
+static struct pci_driver prom21_xhci_driver = {
+ .name = "xhci-pci-prom21",
+ .id_table = pci_ids,
+
+ .probe = prom21_xhci_probe,
+ .remove = prom21_xhci_remove,
+
+ .shutdown = usb_hcd_pci_shutdown,
+ .driver = {
+ .pm = pm_ptr(&usb_hcd_pci_pm_ops),
+ },
+};
+module_pci_driver(prom21_xhci_driver);
+
+MODULE_AUTHOR("Jihong Min <hurryman2212@gmail.com>");
+MODULE_DESCRIPTION("AMD Promontory 21 xHCI PCI Host Controller Driver");
+MODULE_IMPORT_NS("xhci");
+MODULE_LICENSE("GPL");
{ /* end: all zeroes */ }
};
+/* handled by xhci-pci-prom21 if enabled */
+static const struct pci_device_id pci_ids_prom21[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_PROM21_XHCI_43FC) },
+ { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_PROM21_XHCI_43FD) },
+ { /* end: all zeroes */ }
+};
+
static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
if (IS_ENABLED(CONFIG_USB_XHCI_PCI_RENESAS) &&
pci_match_id(pci_ids_renesas, dev))
return -ENODEV;
+ if (IS_ENABLED(CONFIG_USB_XHCI_PCI_PROM21) &&
+ pci_match_id(pci_ids_prom21, dev))
+ return -ENODEV;
+
return xhci_pci_common_probe(dev, id);
}
projects / thirdparty / kernel / stable.git / commitdiff
