usb: dwc3: add xHCI Host support

The Designware USB3 IP can be configured with
an internal xHCI. If we're running on such a
version, let's start the xHCI stack.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/Kconfig

@@ -2,6 +2,7 @@ config USB_DWC3
 	tristate "DesignWare USB3 DRD Core Support"
 	depends on (USB || USB_GADGET)
 	select USB_OTG_UTILS
+	select USB_XHCI_PLATFORM
 	help
 	  Say Y or M here if your system has a Dual Role SuperSpeed
 	  USB controller based on the DesignWare USB3 IP Core.

drivers/usb/dwc3/Makefile

@@ -4,11 +4,13 @@ ccflags-$(CONFIG_USB_DWC3_VERBOSE)	+= -DVERBOSE_DEBUG
 obj-$(CONFIG_USB_DWC3)			+= dwc3.o
 
 dwc3-y					:= core.o
+dwc3-y					+= host.o
 
 ifneq ($(CONFIG_USB_GADGET_DWC3),)
 	dwc3-y				+= gadget.o ep0.o
 endif
 
+
 ifneq ($(CONFIG_DEBUG_FS),)
 	dwc3-y				+= debugfs.o
 endif

drivers/usb/dwc3/core.c

@@ -350,6 +350,8 @@ static int __devinit dwc3_probe(struct platform_device *pdev)
 		goto err1;
 	}
 
+	dwc->res = res;
+
 	res = request_mem_region(res->start, resource_size(res),
 			dev_name(&pdev->dev));
 	if (!res) {
@@ -401,8 +403,27 @@ static int __devinit dwc3_probe(struct platform_device *pdev)
 	mode = DWC3_MODE(dwc->hwparams.hwparams0);
 
 	switch (mode) {
-	case DWC3_MODE_DRD:
 	case DWC3_MODE_DEVICE:
+		ret = dwc3_gadget_init(dwc);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to initialize gadget\n");
+			goto err4;
+		}
+		break;
+	case DWC3_MODE_HOST:
+		ret = dwc3_host_init(dwc);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to initialize host\n");
+			goto err4;
+		}
+		break;
+	case DWC3_MODE_DRD:
+		ret = dwc3_host_init(dwc);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to initialize host\n");
+			goto err4;
+		}
+
 		ret = dwc3_gadget_init(dwc);
 		if (ret) {
 			dev_err(&pdev->dev, "failed to initialize gadget\n");
@@ -427,10 +448,16 @@ static int __devinit dwc3_probe(struct platform_device *pdev)
 
 err5:
 	switch (mode) {
-	case DWC3_MODE_DRD:
 	case DWC3_MODE_DEVICE:
 		dwc3_gadget_exit(dwc);
 		break;
+	case DWC3_MODE_HOST:
+		dwc3_host_exit(dwc);
+		break;
+	case DWC3_MODE_DRD:
+		dwc3_host_exit(dwc);
+		dwc3_gadget_exit(dwc);
+		break;
 	default:
 		/* do nothing */
 		break;
@@ -465,10 +492,16 @@ static int __devexit dwc3_remove(struct platform_device *pdev)
 	dwc3_debugfs_exit(dwc);
 
 	switch (dwc->mode) {
-	case DWC3_MODE_DRD:
 	case DWC3_MODE_DEVICE:
 		dwc3_gadget_exit(dwc);
 		break;
+	case DWC3_MODE_HOST:
+		dwc3_host_exit(dwc);
+		break;
+	case DWC3_MODE_DRD:
+		dwc3_host_exit(dwc);
+		dwc3_gadget_exit(dwc);
+		break;
 	default:
 		/* do nothing */
 		break;

drivers/usb/dwc3/core.h

@@ -41,6 +41,7 @@
 
 #include <linux/device.h>
 #include <linux/spinlock.h>
+#include <linux/ioport.h>
 #include <linux/list.h>
 #include <linux/dma-mapping.h>
 #include <linux/mm.h>
@@ -560,6 +561,7 @@ struct dwc3_hwparams {
  * @ep0_bounce_addr: dma address of ep0_bounce
  * @lock: for synchronizing
  * @dev: pointer to our struct device
+ * @xhci: pointer to our xHCI child
  * @event_buffer_list: a list of event buffers
  * @gadget: device side representation of the peripheral controller
  * @gadget_driver: pointer to the gadget driver
@@ -598,6 +600,9 @@ struct dwc3 {
 	spinlock_t		lock;
 	struct device		*dev;
 
+	struct platform_device	*xhci;
+	struct resource		*res;
+
 	struct dwc3_event_buffer *ev_buffs[DWC3_EVENT_BUFFERS_MAX];
 	struct dwc3_ep		*eps[DWC3_ENDPOINTS_NUM];
 
@@ -782,4 +787,8 @@ union dwc3_event {
 #define DWC3_HAS_XHCI			BIT(1)
 #define DWC3_HAS_OTG			BIT(3)
 
+/* prototypes */
+int dwc3_host_init(struct dwc3 *dwc);
+void dwc3_host_exit(struct dwc3 *dwc);
+
 #endif /* __DRIVERS_USB_DWC3_CORE_H */

drivers/usb/dwc3/host.c

+/**
+ * host.c - DesignWare USB3 DRD Controller Host Glue
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Authors: Felipe Balbi <balbi@ti.com>,
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/list.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+
+#include "core.h"
+#include "io.h"
+
+#include "debug.h"
+
+static struct resource generic_resources[] = {
+	{
+		.flags = IORESOURCE_IRQ,
+	},
+	{
+		.flags = IORESOURCE_MEM,
+	},
+};
+
+int dwc3_host_init(struct dwc3 *dwc)
+{
+	struct platform_device	*xhci;
+	int			ret;
+
+	xhci = platform_device_alloc("xhci", -1);
+	if (!xhci) {
+		dev_err(dwc->dev, "couldn't allocate xHCI device\n");
+		ret = -ENOMEM;
+		goto err0;
+	}
+
+	dma_set_coherent_mask(&xhci->dev, dwc->dev->coherent_dma_mask);
+
+	xhci->dev.parent	= dwc->dev;
+	xhci->dev.dma_mask	= dwc->dev->dma_mask;
+	xhci->dev.dma_parms	= dwc->dev->dma_parms;
+
+	dwc->xhci = xhci;
+
+	/* setup resources */
+	generic_resources[0].start = dwc->irq;
+
+	generic_resources[1].start = dwc->res->start;
+	generic_resources[1].end = dwc->res->start + 0x7fff;
+
+	ret = platform_device_add_resources(xhci, generic_resources,
+			ARRAY_SIZE(generic_resources));
+	if (ret) {
+		dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
+		goto err1;
+	}
+
+	ret = platform_device_add(xhci);
+	if (ret) {
+		dev_err(dwc->dev, "failed to register xHCI device\n");
+		goto err1;
+	}
+
+	return 0;
+
+err1:
+	platform_device_put(xhci);
+
+err0:
+	return ret;
+}
+
+void dwc3_host_exit(struct dwc3 *dwc)
+{
+	platform_device_unregister(dwc->xhci);
+}