v4.19.13 snapshot.
diff --git a/drivers/usb/host/uhci-platform.c b/drivers/usb/host/uhci-platform.c
new file mode 100644
index 0000000..89700e2
--- /dev/null
+++ b/drivers/usb/host/uhci-platform.c
@@ -0,0 +1,191 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Generic UHCI HCD (Host Controller Driver) for Platform Devices
+ *
+ * Copyright (c) 2011 Tony Prisk <linux@prisktech.co.nz>
+ *
+ * This file is based on uhci-grlib.c
+ * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
+ */
+
+#include <linux/of.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+
+static int uhci_platform_init(struct usb_hcd *hcd)
+{
+ struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+
+ /* Probe number of ports if not already provided by DT */
+ if (!uhci->rh_numports)
+ uhci->rh_numports = uhci_count_ports(hcd);
+
+ /* Set up pointers to to generic functions */
+ uhci->reset_hc = uhci_generic_reset_hc;
+ uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc;
+
+ /* No special actions need to be taken for the functions below */
+ uhci->configure_hc = NULL;
+ uhci->resume_detect_interrupts_are_broken = NULL;
+ uhci->global_suspend_mode_is_broken = NULL;
+
+ /* Reset if the controller isn't already safely quiescent. */
+ check_and_reset_hc(uhci);
+ return 0;
+}
+
+static const struct hc_driver uhci_platform_hc_driver = {
+ .description = hcd_name,
+ .product_desc = "Generic UHCI Host Controller",
+ .hcd_priv_size = sizeof(struct uhci_hcd),
+
+ /* Generic hardware linkage */
+ .irq = uhci_irq,
+ .flags = HCD_MEMORY | HCD_USB11,
+
+ /* Basic lifecycle operations */
+ .reset = uhci_platform_init,
+ .start = uhci_start,
+#ifdef CONFIG_PM
+ .pci_suspend = NULL,
+ .pci_resume = NULL,
+ .bus_suspend = uhci_rh_suspend,
+ .bus_resume = uhci_rh_resume,
+#endif
+ .stop = uhci_stop,
+
+ .urb_enqueue = uhci_urb_enqueue,
+ .urb_dequeue = uhci_urb_dequeue,
+
+ .endpoint_disable = uhci_hcd_endpoint_disable,
+ .get_frame_number = uhci_hcd_get_frame_number,
+
+ .hub_status_data = uhci_hub_status_data,
+ .hub_control = uhci_hub_control,
+};
+
+static int uhci_hcd_platform_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct usb_hcd *hcd;
+ struct uhci_hcd *uhci;
+ struct resource *res;
+ int ret;
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ /*
+ * Right now device-tree probed devices don't get dma_mask set.
+ * Since shared usb code relies on it, set it here for now.
+ * Once we have dma capability bindings this can go away.
+ */
+ ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+ if (ret)
+ return ret;
+
+ hcd = usb_create_hcd(&uhci_platform_hc_driver, &pdev->dev,
+ pdev->name);
+ if (!hcd)
+ return -ENOMEM;
+
+ uhci = hcd_to_uhci(hcd);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ hcd->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(hcd->regs)) {
+ ret = PTR_ERR(hcd->regs);
+ goto err_rmr;
+ }
+ hcd->rsrc_start = res->start;
+ hcd->rsrc_len = resource_size(res);
+
+ uhci->regs = hcd->regs;
+
+ /* Grab some things from the device-tree */
+ if (np) {
+ u32 num_ports;
+
+ if (of_property_read_u32(np, "#ports", &num_ports) == 0) {
+ uhci->rh_numports = num_ports;
+ dev_info(&pdev->dev,
+ "Detected %d ports from device-tree\n",
+ num_ports);
+ }
+ if (of_device_is_compatible(np, "aspeed,ast2400-uhci") ||
+ of_device_is_compatible(np, "aspeed,ast2500-uhci")) {
+ uhci->is_aspeed = 1;
+ dev_info(&pdev->dev,
+ "Enabled Aspeed implementation workarounds\n");
+ }
+ }
+
+ /* Get and enable clock if any specified */
+ uhci->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(uhci->clk)) {
+ ret = PTR_ERR(uhci->clk);
+ goto err_rmr;
+ }
+ ret = clk_prepare_enable(uhci->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret);
+ goto err_rmr;
+ }
+
+ ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
+ if (ret)
+ goto err_clk;
+
+ device_wakeup_enable(hcd->self.controller);
+ return 0;
+
+err_clk:
+ clk_disable_unprepare(uhci->clk);
+err_rmr:
+ usb_put_hcd(hcd);
+
+ return ret;
+}
+
+static int uhci_hcd_platform_remove(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(pdev);
+ struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+
+ clk_disable_unprepare(uhci->clk);
+ usb_remove_hcd(hcd);
+ usb_put_hcd(hcd);
+
+ return 0;
+}
+
+/* Make sure the controller is quiescent and that we're not using it
+ * any more. This is mainly for the benefit of programs which, like kexec,
+ * expect the hardware to be idle: not doing DMA or generating IRQs.
+ *
+ * This routine may be called in a damaged or failing kernel. Hence we
+ * do not acquire the spinlock before shutting down the controller.
+ */
+static void uhci_hcd_platform_shutdown(struct platform_device *op)
+{
+ struct usb_hcd *hcd = platform_get_drvdata(op);
+
+ uhci_hc_died(hcd_to_uhci(hcd));
+}
+
+static const struct of_device_id platform_uhci_ids[] = {
+ { .compatible = "generic-uhci", },
+ { .compatible = "platform-uhci", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, platform_uhci_ids);
+
+static struct platform_driver uhci_platform_driver = {
+ .probe = uhci_hcd_platform_probe,
+ .remove = uhci_hcd_platform_remove,
+ .shutdown = uhci_hcd_platform_shutdown,
+ .driver = {
+ .name = "platform-uhci",
+ .of_match_table = platform_uhci_ids,
+ },
+};