USB: gadget: Add USB controller driver for MSM SoC

MSM SoC has chipidea USB controller. So use ci13xxx_udc core.
This driver depends on transceiver driver for clock control,
PHY initialization, VBUS detection.  Register for notify_event
callback to perform MSM specific quirks after controller is reset
and stopped.

Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 160 insertions, 0 deletions

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 6bcbcb073e56..7201b4e32778 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -531,6 +531,27 @@ config USB_EG20T
         default USB_GADGET
         select USB_GADGET_SELECTED
 
+config USB_GADGET_CI13XXX_MSM
+        boolean "MIPS USB CI13xxx for MSM"
+        depends on ARCH_MSM
+        select USB_GADGET_DUALSPEED
+        select USB_MSM_OTG_72K
+        help
+          MSM SoC has chipidea USB controller.  This driver uses
+          ci13xxx_udc core.
+          This driver depends on OTG driver for PHY initialization,
+          clock management, powering up VBUS, and power management.
+
+          Say "y" to link the driver statically, or "m" to build a
+          dynamically linked module called "ci13xxx_msm" and force all
+          gadget drivers to also be dynamically linked.
+
+config USB_CI13XXX_MSM
+        tristate
+        depends on USB_GADGET_CI13XXX_MSM
+        default USB_GADGET
+        select USB_GADGET_SELECTED
+
 #
 # LAST -- dummy/emulated controller
 #
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index f53fda7c2558..fbf5db4d456d 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_USB_LANGWELL)	+= langwell_udc.o
 obj-$(CONFIG_USB_EG20T)         += pch_udc.o
 obj-$(CONFIG_USB_PXA_U2O)       += mv_udc.o
 mv_udc-y                        := mv_udc_core.o mv_udc_phy.o
+obj-$(CONFIG_USB_CI13XXX_MSM)   += ci13xxx_msm.o
 
 #
 # USB gadget drivers
diff --git a/drivers/usb/gadget/ci13xxx_msm.c b/drivers/usb/gadget/ci13xxx_msm.c
new file mode 100644
index 000000000000..c497337bb72b
--- /dev/null
+++ b/drivers/usb/gadget/ci13xxx_msm.c
@@ -0,0 +1,130 @@
+/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/usb/msm_hsusb_hw.h>
+#include <linux/usb/ulpi.h>
+
+#include "ci13xxx_udc.c"
+
+#define MSM_USB_BASE    (udc->regs)
+
+static irqreturn_t msm_udc_irq(int irq, void *data)
+{
+        return udc_irq();
+}
+
+static void ci13xxx_msm_notify_event(struct ci13xxx *udc, unsigned event)
+{
+        struct device *dev = udc->gadget.dev.parent;
+        int val;
+
+        switch (event) {
+        case CI13XXX_CONTROLLER_RESET_EVENT:
+                dev_dbg(dev, "CI13XXX_CONTROLLER_RESET_EVENT received\n");
+                writel(0, USB_AHBBURST);
+                writel(0, USB_AHBMODE);
+                break;
+        case CI13XXX_CONTROLLER_STOPPED_EVENT:
+                dev_dbg(dev, "CI13XXX_CONTROLLER_STOPPED_EVENT received\n");
+                /*
+                 * Put the transceiver in non-driving mode. Otherwise host
+                 * may not detect soft-disconnection.
+                 */
+                val = otg_io_read(udc->transceiver, ULPI_FUNC_CTRL);
+                val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
+                val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
+                otg_io_write(udc->transceiver, val, ULPI_FUNC_CTRL);
+                break;
+        default:
+                dev_dbg(dev, "unknown ci13xxx_udc event\n");
+                break;
+        }
+}
+
+static struct ci13xxx_udc_driver ci13xxx_msm_udc_driver = {
+        .name                   = "ci13xxx_msm",
+        .flags                  = CI13XXX_REGS_SHARED |
+                                  CI13XXX_REQUIRE_TRANSCEIVER |
+                                  CI13XXX_PULLUP_ON_VBUS |
+                                  CI13XXX_DISABLE_STREAMING,
+
+        .notify_event           = ci13xxx_msm_notify_event,
+};
+
+static int ci13xxx_msm_probe(struct platform_device *pdev)
+{
+        struct resource *res;
+        void __iomem *regs;
+        int irq;
+        int ret;
+
+        dev_dbg(&pdev->dev, "ci13xxx_msm_probe\n");
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "failed to get platform resource mem\n");
+                return -ENXIO;
+        }
+
+        regs = ioremap(res->start, resource_size(res));
+        if (!regs) {
+                dev_err(&pdev->dev, "ioremap failed\n");
+                return -ENOMEM;
+        }
+
+        ret = udc_probe(&ci13xxx_msm_udc_driver, &pdev->dev, regs);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "udc_probe failed\n");
+                goto iounmap;
+        }
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                dev_err(&pdev->dev, "IRQ not found\n");
+                ret = -ENXIO;
+                goto udc_remove;
+        }
+
+        ret = request_irq(irq, msm_udc_irq, IRQF_SHARED, pdev->name, pdev);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "request_irq failed\n");
+                goto udc_remove;
+        }
+
+        return 0;
+
+udc_remove:
+        udc_remove();
+iounmap:
+        iounmap(regs);
+
+        return ret;
+}
+
+static struct platform_driver ci13xxx_msm_driver = {
+        .probe = ci13xxx_msm_probe,
+        .driver = { .name = "msm_hsusb", },
+};
+
+static int __init ci13xxx_msm_init(void)
+{
+        return platform_driver_register(&ci13xxx_msm_driver);
+}
+module_init(ci13xxx_msm_init);
diff --git a/drivers/usb/gadget/gadget_chips.h b/drivers/usb/gadget/gadget_chips.h
index 3093ebbea731..ad2114e87511 100644
--- a/drivers/usb/gadget/gadget_chips.h
+++ b/drivers/usb/gadget/gadget_chips.h
@@ -148,6 +148,12 @@
 #define gadget_is_pch(g)        0
 #endif
 
+#ifdef CONFIG_USB_GADGET_CI13XXX_MSM
+#define gadget_is_ci13xxx_msm(g)        (!strcmp("ci13xxx_msm", (g)->name))
+#else
+#define gadget_is_ci13xxx_msm(g)        0
+#endif
+
 /**
  * usb_gadget_controller_number - support bcdDevice id convention
  * @gadget: the controller being driven
@@ -207,6 +213,8 @@ static inline int usb_gadget_controller_number(struct usb_gadget *gadget)
                 return 0x26;
         else if (gadget_is_pch(gadget))
                 return 0x27;
+        else if (gadget_is_ci13xxx_msm(gadget))
+                return 0x28;
         return -ENOENT;
 }