usb: host: xhci: add platform driver support

This adds a fairly simple xhci-platform driver support. Currently it is
used by the dwc3 driver for supporting host mode.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

1 files changed, 205 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
new file mode 100644
index 000000000000..689bc18b051d
--- /dev/null
+++ b/drivers/usb/host/xhci-plat.c
@@ -0,0 +1,205 @@
+/*
+ * xhci-plat.c - xHCI host controller driver platform Bus Glue.
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
+ * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+ *
+ * A lot of code borrowed from the Linux xHCI driver.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include "xhci.h"
+
+static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
+{
+        /*
+         * As of now platform drivers don't provide MSI support so we ensure
+         * here that the generic code does not try to make a pci_dev from our
+         * dev struct in order to setup MSI
+         */
+        xhci->quirks |= XHCI_BROKEN_MSI;
+}
+
+/* called during probe() after chip reset completes */
+static int xhci_plat_setup(struct usb_hcd *hcd)
+{
+        return xhci_gen_setup(hcd, xhci_plat_quirks);
+}
+
+static const struct hc_driver xhci_plat_xhci_driver = {
+        .description =          "xhci-hcd",
+        .product_desc =         "xHCI Host Controller",
+        .hcd_priv_size =        sizeof(struct xhci_hcd *),
+
+        /*
+         * generic hardware linkage
+         */
+        .irq =                  xhci_irq,
+        .flags =                HCD_MEMORY | HCD_USB3 | HCD_SHARED,
+
+        /*
+         * basic lifecycle operations
+         */
+        .reset =                xhci_plat_setup,
+        .start =                xhci_run,
+        .stop =                 xhci_stop,
+        .shutdown =             xhci_shutdown,
+
+        /*
+         * managing i/o requests and associated device resources
+         */
+        .urb_enqueue =          xhci_urb_enqueue,
+        .urb_dequeue =          xhci_urb_dequeue,
+        .alloc_dev =            xhci_alloc_dev,
+        .free_dev =             xhci_free_dev,
+        .alloc_streams =        xhci_alloc_streams,
+        .free_streams =         xhci_free_streams,
+        .add_endpoint =         xhci_add_endpoint,
+        .drop_endpoint =        xhci_drop_endpoint,
+        .endpoint_reset =       xhci_endpoint_reset,
+        .check_bandwidth =      xhci_check_bandwidth,
+        .reset_bandwidth =      xhci_reset_bandwidth,
+        .address_device =       xhci_address_device,
+        .update_hub_device =    xhci_update_hub_device,
+        .reset_device =         xhci_discover_or_reset_device,
+
+        /*
+         * scheduling support
+         */
+        .get_frame_number =     xhci_get_frame,
+
+        /* Root hub support */
+        .hub_control =          xhci_hub_control,
+        .hub_status_data =      xhci_hub_status_data,
+        .bus_suspend =          xhci_bus_suspend,
+        .bus_resume =           xhci_bus_resume,
+};
+
+static int xhci_plat_probe(struct platform_device *pdev)
+{
+        const struct hc_driver  *driver;
+        struct xhci_hcd         *xhci;
+        struct resource         *res;
+        struct usb_hcd          *hcd;
+        int                     ret;
+        int                     irq;
+
+        if (usb_disabled())
+                return -ENODEV;
+
+        driver = &xhci_plat_xhci_driver;
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0)
+                return -ENODEV;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res)
+                return -ENODEV;
+
+        hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
+        if (!hcd)
+                return -ENOMEM;
+
+        hcd->rsrc_start = res->start;
+        hcd->rsrc_len = resource_size(res);
+
+        if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
+                                driver->description)) {
+                dev_dbg(&pdev->dev, "controller already in use\n");
+                ret = -EBUSY;
+                goto put_hcd;
+        }
+
+        hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+        if (!hcd->regs) {
+                dev_dbg(&pdev->dev, "error mapping memory\n");
+                ret = -EFAULT;
+                goto release_mem_region;
+        }
+
+        ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
+        if (ret)
+                goto unmap_registers;
+
+        /* USB 2.0 roothub is stored in the platform_device now. */
+        hcd = dev_get_drvdata(&pdev->dev);
+        xhci = hcd_to_xhci(hcd);
+        xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
+                        dev_name(&pdev->dev), hcd);
+        if (!xhci->shared_hcd) {
+                ret = -ENOMEM;
+                goto dealloc_usb2_hcd;
+        }
+
+        /*
+         * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
+         * is called by usb_add_hcd().
+         */
+        *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
+
+        ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
+        if (ret)
+                goto put_usb3_hcd;
+
+        return 0;
+
+put_usb3_hcd:
+        usb_put_hcd(xhci->shared_hcd);
+
+dealloc_usb2_hcd:
+        usb_remove_hcd(hcd);
+
+unmap_registers:
+        iounmap(hcd->regs);
+
+release_mem_region:
+        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+
+put_hcd:
+        usb_put_hcd(hcd);
+
+        return ret;
+}
+
+static int xhci_plat_remove(struct platform_device *dev)
+{
+        struct usb_hcd  *hcd = platform_get_drvdata(dev);
+        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+        usb_remove_hcd(xhci->shared_hcd);
+        usb_put_hcd(xhci->shared_hcd);
+
+        usb_remove_hcd(hcd);
+        iounmap(hcd->regs);
+        usb_put_hcd(hcd);
+        kfree(xhci);
+
+        return 0;
+}
+
+static struct platform_driver usb_xhci_driver = {
+        .probe  = xhci_plat_probe,
+        .remove = xhci_plat_remove,
+        .driver = {
+                .name = "xhci-hcd",
+        },
+};
+MODULE_ALIAS("platform:xhci-hcd");
+
+int xhci_register_plat(void)
+{
+        return platform_driver_register(&usb_xhci_driver);
+}
+
+void xhci_unregister_plat(void)
+{
+        platform_driver_unregister(&usb_xhci_driver);
+}