1 files changed, 110 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-ext-caps.c b/drivers/usb/host/xhci-ext-caps.c
new file mode 100644
index 0000000000..7a4c2c4ad5
--- /dev/null
+++ b/drivers/usb/host/xhci-ext-caps.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * XHCI extended capability handling
+ *
+ * Copyright (c) 2017 Hans de Goede <hdegoede@redhat.com>
+ */
+
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/pci.h>
+#include "xhci.h"
+
+#define USB_SW_DRV_NAME		"intel_xhci_usb_sw"
+#define USB_SW_RESOURCE_SIZE	0x400
+
+#define PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI	0x22b5
+
+static const struct property_entry role_switch_props[] = {
+	PROPERTY_ENTRY_BOOL("sw_switch_disable"),
+	{},
+};
+
+static void xhci_intel_unregister_pdev(void *arg)
+{
+	platform_device_unregister(arg);
+}
+
+static int xhci_create_intel_xhci_sw_pdev(struct xhci_hcd *xhci, u32 cap_offset)
+{
+	struct usb_hcd *hcd = xhci_to_hcd(xhci);
+	struct device *dev = hcd->self.controller;
+	struct platform_device *pdev;
+	struct pci_dev *pci = to_pci_dev(dev);
+	struct resource	res = { 0, };
+	int ret;
+
+	pdev = platform_device_alloc(USB_SW_DRV_NAME, PLATFORM_DEVID_NONE);
+	if (!pdev) {
+		xhci_err(xhci, "couldn't allocate %s platform device\n",
+			 USB_SW_DRV_NAME);
+		return -ENOMEM;
+	}
+
+	res.start = hcd->rsrc_start + cap_offset;
+	res.end	  = res.start + USB_SW_RESOURCE_SIZE - 1;
+	res.name  = USB_SW_DRV_NAME;
+	res.flags = IORESOURCE_MEM;
+
+	ret = platform_device_add_resources(pdev, &res, 1);
+	if (ret) {
+		dev_err(dev, "couldn't add resources to intel_xhci_usb_sw pdev\n");
+		platform_device_put(pdev);
+		return ret;
+	}
+
+	if (pci->device == PCI_DEVICE_ID_INTEL_CHERRYVIEW_XHCI) {
+		ret = device_create_managed_software_node(&pdev->dev, role_switch_props,
+							  NULL);
+		if (ret) {
+			dev_err(dev, "failed to register device properties\n");
+			platform_device_put(pdev);
+			return ret;
+		}
+	}
+
+	pdev->dev.parent = dev;
+
+	ret = platform_device_add(pdev);
+	if (ret) {
+		dev_err(dev, "couldn't register intel_xhci_usb_sw pdev\n");
+		platform_device_put(pdev);
+		return ret;
+	}
+
+	ret = devm_add_action_or_reset(dev, xhci_intel_unregister_pdev, pdev);
+	if (ret) {
+		dev_err(dev, "couldn't add unregister action for intel_xhci_usb_sw pdev\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+int xhci_ext_cap_init(struct xhci_hcd *xhci)
+{
+	void __iomem *base = &xhci->cap_regs->hc_capbase;
+	u32 offset, val;
+	int ret;
+
+	offset = xhci_find_next_ext_cap(base, 0, 0);
+
+	while (offset) {
+		val = readl(base + offset);
+
+		switch (XHCI_EXT_CAPS_ID(val)) {
+		case XHCI_EXT_CAPS_VENDOR_INTEL:
+			if (xhci->quirks & XHCI_INTEL_USB_ROLE_SW) {
+				ret = xhci_create_intel_xhci_sw_pdev(xhci,
+								     offset);
+				if (ret)
+					return ret;
+			}
+			break;
+		}
+		offset = xhci_find_next_ext_cap(base, offset, 0);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xhci_ext_cap_init);