Add the Initial OTG driver for dwc3.
Currently support only
* ID based Role switching.
Signed-off-by: George Cherian <george.cherian@xxxxxx>
---
drivers/usb/dwc3/Makefile | 4 ++
drivers/usb/dwc3/core.c | 10 +---
drivers/usb/dwc3/core.h | 10 ++++
drivers/usb/dwc3/otg.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 142 insertions(+), 8 deletions(-)
create mode 100644 drivers/usb/dwc3/otg.c
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index bb34fbc..fe7af97 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -12,6 +12,10 @@ ifneq ($(filter y,$(CONFIG_USB_DWC3_HOST) $(CONFIG_USB_DWC3_DUAL_ROLE)),)
dwc3-y += host.o
endif
+ifneq ($(CONFIG_USB_DWC3_DUAL_ROLE),)
+ dwc3-y += otg.o
+endif
+
ifneq ($(filter y,$(CONFIG_USB_DWC3_GADGET) $(CONFIG_USB_DWC3_DUAL_ROLE)),)
dwc3-y += gadget.o ep0.o
endif
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index dbd5589..dd4af3f 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -685,15 +685,9 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
break;
case USB_DR_MODE_OTG:
dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
- ret = dwc3_host_init(dwc);
- if (ret) {
- dev_err(dev, "failed to initialize host\n");
- return ret;
- }
-
- ret = dwc3_gadget_init(dwc);
+ ret = dwc3_otg_init(dwc);
if (ret) {
- dev_err(dev, "failed to initialize gadget\n");
+ dev_err(dev, "failed to initialize otg\n");
return ret;
}
break;
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index eb2e970..001d77d 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1103,6 +1103,16 @@ static inline int dwc3_send_gadget_generic_command(struct dwc3 *dwc,
{ return 0; }
#endif
+#if IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)
+int dwc3_otg_init(struct dwc3 *dwc);
+void dwc3_otg_exit(struct dwc3 *dwc);
+#else
+static inline int dwc3_otg_init(struct dwc3 *dwc)
+{ return 0; }
+static inline void dwc3_otg_exit(struct dwc3 *dwc)
+{ }
+#endif
+
/* power management interface */
#if !IS_ENABLED(CONFIG_USB_DWC3_HOST)
int dwc3_gadget_suspend(struct dwc3 *dwc);
diff --git a/drivers/usb/dwc3/otg.c b/drivers/usb/dwc3/otg.c
new file mode 100644
index 0000000..b5c31c0
--- /dev/null
+++ b/drivers/usb/dwc3/otg.c
@@ -0,0 +1,126 @@
+/**
+ * otg.c - DesignWare USB3 DRD Controller OTG
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Authors: George Cherian <george.cherian@xxxxxx>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 of
+ * the License 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.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include <linux/usb/drd.h>
+#include "core.h"
+#include "io.h"
+
+#define DWC3_GSTS_OTG_IP (1 << 10)
+
+static irqreturn_t dwc3_otg_interrupt(int irq , void *_dwc)
+{
+ struct dwc3 *dwc = _dwc;
+ u32 reg;
+
+ spin_lock(&dwc->lock);
+ reg = dwc3_readl(dwc->regs, DWC3_GSTS);
+ if (reg & DWC3_GSTS_OTG_IP) {
+ reg = dwc3_readl(dwc->regs, DWC3_OEVT);
+ dev_vdbg(dwc->dev, "OTG Interrupt %x\n", reg);
+ dwc3_writel(dwc->regs, DWC3_OEVT, reg);
+ spin_unlock(&dwc->lock);
+ return IRQ_WAKE_THREAD;
+ }
+
+ spin_unlock(&dwc->lock);
+ return IRQ_NONE;
+}
+
+static irqreturn_t dwc3_otg_thread_interrupt(int irq, void *_dwc)
+{
+ struct dwc3 *dwc = _dwc;
+ u32 reg = dwc3_readl(dwc->regs, DWC3_OSTS);
+
+ dev_vdbg(dwc->dev, "OTG thread interrupt\n");
+ if ((reg & DWC3_OSTS_CONIDSTS)) {
+ usb_drd_stop_hcd(dwc->dev);
+ dwc3_writel(dwc->regs, DWC3_OCFG, DWC3_OCFG_SFTRSTMASK);
+ dwc3_writel(dwc->regs, DWC3_OCTL,
+ DWC3_OCTL_SESREQ | DWC3_OCTL_PERIMODE);
+ if (usb_drd_get_state(dwc->dev) & DRD_DEVICE_REGISTERED) {
+ usb_drd_start_udc(dwc->dev);
+ } else {
+ dwc3_core_gadget_helper(dwc);
+ dwc3_gadget_init(dwc);
+ }
+ dwc3_writel(dwc->regs, DWC3_OEVTEN,
+ DWC3_OEVTEN_CONIDSTSCHNGEN);
+ } else if (!(reg & DWC3_OSTS_CONIDSTS)) {
+ usb_drd_stop_udc(dwc->dev);
+ dwc3_writel(dwc->regs, DWC3_OCFG,
+ DWC3_OCFG_DISPWRCUTTOFF | DWC3_OCFG_SFTRSTMASK);
+ dwc3_writel(dwc->regs, DWC3_OCTL, DWC3_OCTL_PRTPWRCTL);
+ if (usb_drd_get_state(dwc->dev) & DRD_HOST_REGISTERED)
+ usb_drd_start_hcd(dwc->dev);
+ else
+ dwc3_host_init(dwc);
+
+ dwc3_writel(dwc->regs, DWC3_OEVTEN,
+ DWC3_OEVTEN_CONIDSTSCHNGEN);
+ }
+
+ return IRQ_HANDLED;
+}
+
+int dwc3_otg_init(struct dwc3 *dwc)
+{
+ u32 reg, ret;
+
+ usb_drd_add(dwc->dev);
+ dwc3_writel(dwc->regs, DWC3_OEVT, 0xFFFF);
+ if (dwc->otg_irq > 0) {
+ ret = devm_request_threaded_irq(dwc->dev, dwc->otg_irq,
+ dwc3_otg_interrupt,
+ dwc3_otg_thread_interrupt,
+ IRQF_SHARED, "dwc3-otg", dwc);
+ } else {
+ WARN(1, "Trying to request invalid otg_irq");
+ return -ENODEV;
+ }
+
+ dwc3_writel(dwc->regs, DWC3_OEVTEN, DWC3_OEVTEN_CONIDSTSCHNGEN);
+ dwc3_writel(dwc->regs, DWC3_OCTL, DWC3_OCTL_PERIMODE);
+
+ reg = dwc3_readl(dwc->regs, DWC3_OSTS);
+ if ((reg & DWC3_OSTS_CONIDSTS)) {
+ dev_vdbg(dwc->dev, "Gadget init\n");
+ dwc3_writel(dwc->regs, DWC3_OCFG, DWC3_OCFG_SFTRSTMASK);
+ dwc3_writel(dwc->regs, DWC3_OCTL,
+ DWC3_OCTL_SESREQ | DWC3_OCTL_PERIMODE);
+ dwc3_gadget_init(dwc);
+ dwc3_writel(dwc->regs, DWC3_OEVTEN,
+ DWC3_OEVTEN_CONIDSTSCHNGEN);
+
+ } else if (!(reg & DWC3_OSTS_CONIDSTS)) {
+ dev_vdbg(dwc->dev, "Host init\n");
+ dwc3_writel(dwc->regs, DWC3_OCFG,
+ DWC3_OCFG_DISPWRCUTTOFF | DWC3_OCFG_SFTRSTMASK);
+ dwc3_writel(dwc->regs, DWC3_OCTL, DWC3_OCTL_PRTPWRCTL);
+ dwc3_host_init(dwc);
+ dwc3_writel(dwc->regs, DWC3_OEVTEN,
+ DWC3_OEVTEN_CONIDSTSCHNGEN);
+ }
+
+ return 0;
+}
--
1.8.3.1
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