staging: dwc2: add platform device bindings

This adds a dwc_platform.ko module that can be loaded by using
compatible = "snps,dwc2" in a device tree.

Signed-off-by: Matthijs Kooijman <matthijs@stdin.nl>
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/staging/dwc2.txt b/Documentation/devicetree/bindings/staging/dwc2.txt
new file mode 100644 (file)
index 0000000..1a1b7cf
--- /dev/null
+++ b/Documentation/devicetree/bindings/staging/dwc2.txt
@@ -0,0 +1,15 @@
+Platform DesignWare HS OTG USB 2.0 controller
+-----------------------------------------------------
+
+Required properties:
+- compatible : "snps,dwc2"
+- reg : Should contain 1 register range (address and length)
+- interrupts : Should contain 1 interrupt
+
+Example:
+
+        usb@101c0000 {
+                compatible = "ralink,rt3050-usb, snps,dwc2";
+                reg = <0x101c0000 40000>;
+                interrupts = <18>;
+        };

diff --git a/drivers/staging/dwc2/Kconfig b/drivers/staging/dwc2/Kconfig
index 2f75be716ca9c9e1acf837386279a9710e041500..f0b4739c65a17eeff63facaf8158cfedbe0ba025 100644 (file)
--- a/drivers/staging/dwc2/Kconfig
+++ b/drivers/staging/dwc2/Kconfig
@@ -8,9 +8,11 @@ config USB_DWC2
          USB controller based on the DesignWare HSOTG IP Core.
 
          If you choose to build this driver as dynamically linked
-         modules, the core module will be called dwc2.ko, and the
+         modules, the core module will be called dwc2.ko, the
          PCI bus interface module (if you have a PCI bus system)
-         will be called dwc2_pci.ko.
+         will be called dwc2_pci.ko and the platform interface module
+         (for controllers directly connected to the CPU) will be called
+         dwc2_platform.ko.
 
          NOTE: This driver at present only implements the Host mode
          of the controller. The existing s3c-hsotg driver supports

diff --git a/drivers/staging/dwc2/Makefile b/drivers/staging/dwc2/Makefile
index 6dccf46cf4b54e0537a501a2d97dc2e6ca0985d1..11529d3439b056379a543ae194129cffd0d5c984 100644 (file)
--- a/drivers/staging/dwc2/Makefile
+++ b/drivers/staging/dwc2/Makefile
@@ -19,5 +19,7 @@ dwc2-y                                        += hcd_queue.o hcd_ddma.o
 ifneq ($(CONFIG_PCI),)
        obj-$(CONFIG_USB_DWC2)          += dwc2_pci.o
 endif
+obj-$(CONFIG_USB_DWC2)                 += dwc2_platform.o
 
 dwc2_pci-y                             += pci.o
+dwc2_platform-y                                += platform.o

diff --git a/drivers/staging/dwc2/hcd.c b/drivers/staging/dwc2/hcd.c
index 65b73482da4269174add977b2475f02bf920fb70..827ab781ae9bd68f8aca7f2176babdc00cf1695e 100644 (file)
--- a/drivers/staging/dwc2/hcd.c
+++ b/drivers/staging/dwc2/hcd.c
@@ -2693,6 +2693,7 @@ void dwc2_set_all_params(struct dwc2_core_params *params, int value)
        for (i = 0; i < size; i++)
                p[i] = -1;
 }
+EXPORT_SYMBOL_GPL(dwc2_set_all_params);
 
 /*
  * Initializes the HCD. This function allocates memory for and initializes the

diff --git a/drivers/staging/dwc2/platform.c b/drivers/staging/dwc2/platform.c
new file mode 100644 (file)
index 0000000..1f3d581
--- /dev/null
+++ b/drivers/staging/dwc2/platform.c
@@ -0,0 +1,145 @@
+/*
+ * platform.c - DesignWare HS OTG Controller platform driver
+ *
+ * Copyright (C) Matthijs Kooijman <matthijs@stdin.nl>
+ *
+ * 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") as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any
+ * later version.
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_device.h>
+
+#include "core.h"
+#include "hcd.h"
+
+static const char dwc2_driver_name[] = "dwc2";
+
+/**
+ * dwc2_driver_remove() - Called when the DWC_otg core is unregistered with the
+ * DWC_otg driver
+ *
+ * @dev: Platform device
+ *
+ * This routine is called, for example, when the rmmod command is executed. The
+ * device may or may not be electrically present. If it is present, the driver
+ * stops device processing. Any resources used on behalf of this device are
+ * freed.
+ */
+static int dwc2_driver_remove(struct platform_device *dev)
+{
+       struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
+
+       dwc2_hcd_remove(hsotg);
+
+       return 0;
+}
+
+/**
+ * dwc2_driver_probe() - Called when the DWC_otg core is bound to the DWC_otg
+ * driver
+ *
+ * @dev: Platform device
+ *
+ * This routine creates the driver components required to control the device
+ * (core, HCD, and PCD) and initializes the device. The driver components are
+ * stored in a dwc2_hsotg structure. A reference to the dwc2_hsotg is saved
+ * in the device private data. This allows the driver to access the dwc2_hsotg
+ * structure on subsequent calls to driver methods for this device.
+ */
+static int dwc2_driver_probe(struct platform_device *dev)
+{
+       struct dwc2_hsotg *hsotg;
+       struct resource *res;
+       int retval;
+       int irq;
+       struct dwc2_core_params params;
+
+       /* Default all params to autodetect */
+       dwc2_set_all_params(&params, -1);
+
+       hsotg = devm_kzalloc(&dev->dev, sizeof(*hsotg), GFP_KERNEL);
+       if (!hsotg)
+               return -ENOMEM;
+
+       hsotg->dev = &dev->dev;
+
+       irq = platform_get_irq(dev, 0);
+       if (irq < 0) {
+               dev_err(&dev->dev, "missing IRQ resource\n");
+               return -EINVAL;
+       }
+
+       res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+       if (!res) {
+               dev_err(&dev->dev, "missing memory base resource\n");
+               return -EINVAL;
+       }
+
+       hsotg->regs = devm_ioremap_resource(&dev->dev, res);
+       if (IS_ERR(hsotg->regs))
+               return PTR_ERR(hsotg->regs);
+
+       dev_dbg(&dev->dev, "mapped PA %08lx to VA %p\n",
+               (unsigned long)res->start, hsotg->regs);
+
+       retval = dwc2_hcd_init(hsotg, irq, &params);
+       if (retval)
+               return retval;
+
+       platform_set_drvdata(dev, hsotg);
+
+       return retval;
+}
+
+static const struct of_device_id dwc2_of_match_table[] = {
+       { .compatible = "snps,dwc2" },
+       {},
+};
+MODULE_DEVICE_TABLE(of, dwc2_of_match_table);
+
+static struct platform_driver dwc2_platform_driver = {
+       .driver = {
+               .name = (char *)dwc2_driver_name,
+               .of_match_table = dwc2_of_match_table,
+       },
+       .probe = dwc2_driver_probe,
+       .remove = dwc2_driver_remove,
+};
+
+module_platform_driver(dwc2_platform_driver);
+
+MODULE_DESCRIPTION("DESIGNWARE HS OTG Platform Glue");
+MODULE_AUTHOR("Matthijs Kooijman <matthijs@stdin.nl>");
+MODULE_LICENSE("Dual BSD/GPL");