[PATCH v6 05/10] usb: dwc3: core: cleanup IRQ resources

[Roger Quadros <rogerq@ti.com>]

Implementations might use different IRQs for
host, gadget and OTG so use named interrupt resources
to allow Device tree to specify the 3 interrupts.

Following are the interrupt names

Peripheral Interrupt - peripheral
HOST Interrupt - host
OTG Interrupt - otg

We still maintain backward compatibility for a single named
interrupt for all 3 interrupts (e.g. for dwc3-pci) and
single unnamed interrupt for all 3 interrupts (e.g. old DT).

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 drivers/usb/dwc3/core.c   | 26 ++++++++++++++++----------
 drivers/usb/dwc3/core.h   |  5 +++++
 drivers/usb/dwc3/gadget.c | 19 ++++++++++++++++++-
 drivers/usb/dwc3/host.c   | 19 +++++++++++++++++++
 4 files changed, 58 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 17fd8144..1c754749 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -746,6 +746,8 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
 {
 	struct device *dev = dwc->dev;
 	int ret;
+	struct resource *res;
+	struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
 
 	switch (dwc->dr_mode) {
 	case USB_DR_MODE_PERIPHERAL:
@@ -765,6 +767,20 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
 		}
 		break;
 	case USB_DR_MODE_OTG:
+		dwc->otg_irq = platform_get_irq_byname(dwc3_pdev, "otg");
+		if (dwc->otg_irq <= 0) {
+			dwc->otg_irq = platform_get_irq_byname(dwc3_pdev,
+							       "dwc_usb3");
+			if (dwc->otg_irq <= 0) {
+				res = platform_get_resource(dwc3_pdev,
+							    IORESOURCE_IRQ, 0);
+				if (!res) {
+					dev_err(dwc->dev, "missing otg IRQ\n");
+					return -ENODEV;
+				}
+				dwc->otg_irq = res->start;
+			}
+		}
 		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
 		ret = dwc3_host_init(dwc);
 		if (ret) {
@@ -831,16 +847,6 @@ static int dwc3_probe(struct platform_device *pdev)
 	dwc->mem = mem;
 	dwc->dev = dev;
 
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
-		dev_err(dev, "missing IRQ\n");
-		return -ENODEV;
-	}
-	dwc->xhci_resources[1].start = res->start;
-	dwc->xhci_resources[1].end = res->end;
-	dwc->xhci_resources[1].flags = res->flags;
-	dwc->xhci_resources[1].name = res->name;
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(dev, "missing memory resource\n");
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 81039f7..79422dd 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -754,6 +754,8 @@ struct dwc3_scratchpad_array {
  * @maximum_speed: maximum speed requested (mainly for testing purposes)
  * @revision: revision register contents
  * @dr_mode: requested mode of operation
+ * @gadget_irq: IRQ number for Peripheral IRQs
+ * @otg_irq: IRQ number for OTG IRQs
  * @usb2_phy: pointer to USB2 PHY
  * @usb3_phy: pointer to USB3 PHY
  * @usb2_generic_phy: pointer to USB2 PHY
@@ -857,6 +859,9 @@ struct dwc3 {
 
 	enum usb_dr_mode	dr_mode;
 
+	int			gadget_irq;
+	int			otg_irq;
+
 	/* used for suspend/resume */
 	u32			dcfg;
 	u32			gctl;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 3ac170f..90f514c 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1617,7 +1617,7 @@ static int dwc3_gadget_start(struct usb_gadget *g,
 	int			irq;
 	u32			reg;
 
-	irq = platform_get_irq(to_platform_device(dwc->dev), 0);
+	irq = dwc->gadget_irq;
 	ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
 			IRQF_SHARED, "dwc3", dwc);
 	if (ret) {
@@ -2795,6 +2795,23 @@ static irqreturn_t dwc3_interrupt(int irq, void *_dwc)
 int dwc3_gadget_init(struct dwc3 *dwc)
 {
 	int					ret;
+	struct resource *res;
+	struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
+
+	dwc->gadget_irq = platform_get_irq_byname(dwc3_pdev, "peripheral");
+	if (dwc->gadget_irq <= 0) {
+		dwc->gadget_irq = platform_get_irq_byname(dwc3_pdev,
+							  "dwc_usb3");
+		if (dwc->gadget_irq <= 0) {
+			res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ,
+						    0);
+			if (!res) {
+				dev_err(dwc->dev, "missing peripheral IRQ\n");
+				return -ENODEV;
+			}
+			dwc->gadget_irq = res->start;
+		}
+	}
 
 	dwc->ctrl_req = dma_alloc_coherent(dwc->dev, sizeof(*dwc->ctrl_req),
 			&dwc->ctrl_req_addr, GFP_KERNEL);
diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
index c679f63..f2b60a4 100644
--- a/drivers/usb/dwc3/host.c
+++ b/drivers/usb/dwc3/host.c
@@ -25,6 +25,25 @@ int dwc3_host_init(struct dwc3 *dwc)
 	struct platform_device	*xhci;
 	struct usb_xhci_pdata	pdata;
 	int			ret;
+	struct resource		*res;
+	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);
+
+	res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ, "host");
+	if (!res) {
+		res = platform_get_resource_byname(dwc3_pdev, IORESOURCE_IRQ,
+						   "dwc_usb3");
+		if (!res) {
+			res = platform_get_resource(dwc3_pdev, IORESOURCE_IRQ,
+						    0);
+			if (!res)
+				return -ENOMEM;
+		}
+	}
+
+	dwc->xhci_resources[1].start = res->start;
+	dwc->xhci_resources[1].end = res->end;
+	dwc->xhci_resources[1].flags = res->flags;
+	dwc->xhci_resources[1].name = res->name;
 
 	xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
 	if (!xhci) {
-- 
2.5.0