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>

5 files changed, 164 insertions, 3 deletions

diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 3c1d67d324fd..2c05ec9cf352 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/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.
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index 593d1dbc465b..0926e71142b9 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/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
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index df151992e49d..410835e28cf6 100644
--- a/drivers/usb/dwc3/core.c
+++ b/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) {
@@ -401,7 +403,6 @@ 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) {
@@ -409,6 +410,26 @@ static int __devinit dwc3_probe(struct platform_device *pdev)
                         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");
+                        goto err4;
+                }
+                break;
         default:
                 dev_err(&pdev->dev, "Unsupported mode of operation %d\n", mode);
                 goto err4;
@@ -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;
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index a3ef8f34bf77..a77554373224 100644
--- a/drivers/usb/dwc3/core.h
+++ b/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 */
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
new file mode 100644
index 000000000000..9b300a26fceb
--- /dev/null
+++ b/drivers/usb/dwc3/host.c
@@ -0,0 +1,116 @@
+/**
+ * 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);
+}