usb: dwc3: adapt to use dr_mode device tree helper

This patch adapts the dwc3 to use the device tree helper
"of_usb_get_dr_mode" for the mode of operation of the dwc3 instance
being probed.

[ balbi@ti.com : make of_usb_get_dr_mode() conditional on
	dev->of_node and let pdata pass dr_mode too ]

Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Ruchika Kharwar <ruchika@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/core.c

@@ -37,6 +37,7 @@
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <linux/usb/of.h>
+#include <linux/usb/otg.h>
 
 #include "platform_data.h"
 #include "core.h"
@@ -359,8 +360,6 @@ static int dwc3_probe(struct platform_device *pdev)
 	void __iomem		*regs;
 	void			*mem;
 
-	u8			mode;
-
 	mem = devm_kzalloc(dev, sizeof(*dwc) + DWC3_ALIGN_MASK, GFP_KERNEL);
 	if (!mem) {
 		dev_err(dev, "not enough memory\n");
@@ -415,6 +414,7 @@ static int dwc3_probe(struct platform_device *pdev)
 		dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
 
 		dwc->needs_fifo_resize = of_property_read_bool(node, "tx-fifo-resize");
+		dwc->dr_mode = of_usb_get_dr_mode(node);
 	} else {
 		dwc->maximum_speed = pdata->maximum_speed;
 
@@ -422,6 +422,7 @@ static int dwc3_probe(struct platform_device *pdev)
 		dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
 
 		dwc->needs_fifo_resize = pdata->tx_fifo_resize;
+		dwc->dr_mode = pdata->dr_mode;
 	}
 
 	/* default to superspeed if no maximum_speed passed */
@@ -498,14 +499,15 @@ static int dwc3_probe(struct platform_device *pdev)
 	}
 
 	if (IS_ENABLED(CONFIG_USB_DWC3_HOST))
-		mode = DWC3_MODE_HOST;
+		dwc->dr_mode = USB_DR_MODE_HOST;
 	else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
-		mode = DWC3_MODE_DEVICE;
-	else
-		mode = DWC3_MODE_DRD;
+		dwc->dr_mode = USB_DR_MODE_PERIPHERAL;
+
+	if (dwc->dr_mode == USB_DR_MODE_UNKNOWN)
+		dwc->dr_mode = USB_DR_MODE_OTG;
 
-	switch (mode) {
-	case DWC3_MODE_DEVICE:
+	switch (dwc->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
 		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
 		ret = dwc3_gadget_init(dwc);
 		if (ret) {
@@ -513,7 +515,7 @@ static int dwc3_probe(struct platform_device *pdev)
 			goto err2;
 		}
 		break;
-	case DWC3_MODE_HOST:
+	case USB_DR_MODE_HOST:
 		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_HOST);
 		ret = dwc3_host_init(dwc);
 		if (ret) {
@@ -521,7 +523,7 @@ static int dwc3_probe(struct platform_device *pdev)
 			goto err2;
 		}
 		break;
-	case DWC3_MODE_DRD:
+	case USB_DR_MODE_OTG:
 		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
 		ret = dwc3_host_init(dwc);
 		if (ret) {
@@ -536,10 +538,9 @@ static int dwc3_probe(struct platform_device *pdev)
 		}
 		break;
 	default:
-		dev_err(dev, "Unsupported mode of operation %d\n", mode);
+		dev_err(dev, "Unsupported mode of operation %d\n", dwc->dr_mode);
 		goto err2;
 	}
-	dwc->mode = mode;
 
 	ret = dwc3_debugfs_init(dwc);
 	if (ret) {
@@ -552,14 +553,14 @@ static int dwc3_probe(struct platform_device *pdev)
 	return 0;
 
 err3:
-	switch (mode) {
-	case DWC3_MODE_DEVICE:
+	switch (dwc->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
 		dwc3_gadget_exit(dwc);
 		break;
-	case DWC3_MODE_HOST:
+	case USB_DR_MODE_HOST:
 		dwc3_host_exit(dwc);
 		break;
-	case DWC3_MODE_DRD:
+	case USB_DR_MODE_OTG:
 		dwc3_host_exit(dwc);
 		dwc3_gadget_exit(dwc);
 		break;
@@ -592,14 +593,14 @@ static int dwc3_remove(struct platform_device *pdev)
 
 	dwc3_debugfs_exit(dwc);
 
-	switch (dwc->mode) {
-	case DWC3_MODE_DEVICE:
+	switch (dwc->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
 		dwc3_gadget_exit(dwc);
 		break;
-	case DWC3_MODE_HOST:
+	case USB_DR_MODE_HOST:
 		dwc3_host_exit(dwc);
 		break;
-	case DWC3_MODE_DRD:
+	case USB_DR_MODE_OTG:
 		dwc3_host_exit(dwc);
 		dwc3_gadget_exit(dwc);
 		break;
@@ -623,12 +624,12 @@ static int dwc3_prepare(struct device *dev)
 
 	spin_lock_irqsave(&dwc->lock, flags);
 
-	switch (dwc->mode) {
-	case DWC3_MODE_DEVICE:
-	case DWC3_MODE_DRD:
+	switch (dwc->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
+	case USB_DR_MODE_OTG:
 		dwc3_gadget_prepare(dwc);
 		/* FALLTHROUGH */
-	case DWC3_MODE_HOST:
+	case USB_DR_MODE_HOST:
 	default:
 		dwc3_event_buffers_cleanup(dwc);
 		break;
@@ -646,12 +647,12 @@ static void dwc3_complete(struct device *dev)
 
 	spin_lock_irqsave(&dwc->lock, flags);
 
-	switch (dwc->mode) {
-	case DWC3_MODE_DEVICE:
-	case DWC3_MODE_DRD:
+	switch (dwc->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
+	case USB_DR_MODE_OTG:
 		dwc3_gadget_complete(dwc);
 		/* FALLTHROUGH */
-	case DWC3_MODE_HOST:
+	case USB_DR_MODE_HOST:
 	default:
 		dwc3_event_buffers_setup(dwc);
 		break;
@@ -667,12 +668,12 @@ static int dwc3_suspend(struct device *dev)
 
 	spin_lock_irqsave(&dwc->lock, flags);
 
-	switch (dwc->mode) {
-	case DWC3_MODE_DEVICE:
-	case DWC3_MODE_DRD:
+	switch (dwc->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
+	case USB_DR_MODE_OTG:
 		dwc3_gadget_suspend(dwc);
 		/* FALLTHROUGH */
-	case DWC3_MODE_HOST:
+	case USB_DR_MODE_HOST:
 	default:
 		/* do nothing */
 		break;
@@ -700,12 +701,12 @@ static int dwc3_resume(struct device *dev)
 
 	dwc3_writel(dwc->regs, DWC3_GCTL, dwc->gctl);
 
-	switch (dwc->mode) {
-	case DWC3_MODE_DEVICE:
-	case DWC3_MODE_DRD:
+	switch (dwc->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
+	case USB_DR_MODE_OTG:
 		dwc3_gadget_resume(dwc);
 		/* FALLTHROUGH */
-	case DWC3_MODE_HOST:
+	case USB_DR_MODE_HOST:
 	default:
 		/* do nothing */
 		break;

drivers/usb/dwc3/core.h

@@ -29,6 +29,7 @@
 
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
+#include <linux/usb/otg.h>
 
 /* Global constants */
 #define DWC3_EP0_BOUNCE_SIZE	512
@@ -545,11 +546,6 @@ struct dwc3_hwparams {
 /* HWPARAMS0 */
 #define DWC3_MODE(n)		((n) & 0x7)
 
-#define DWC3_MODE_DEVICE	0
-#define DWC3_MODE_HOST		1
-#define DWC3_MODE_DRD		2
-#define DWC3_MODE_HUB		3
-
 #define DWC3_MDWIDTH(n)		(((n) & 0xff00) >> 8)
 
 /* HWPARAMS1 */
@@ -611,7 +607,7 @@ struct dwc3_scratchpad_array {
  * @u1u2: only used on revisions <1.83a for workaround
  * @maximum_speed: maximum speed requested (mainly for testing purposes)
  * @revision: revision register contents
- * @mode: mode of operation
+ * @dr_mode: requested mode of operation
  * @usb2_phy: pointer to USB2 PHY
  * @usb3_phy: pointer to USB3 PHY
  * @dcfg: saved contents of DCFG register
@@ -669,6 +665,8 @@ struct dwc3 {
 	void __iomem		*regs;
 	size_t			regs_size;
 
+	enum usb_dr_mode	dr_mode;
+
 	/* used for suspend/resume */
 	u32			dcfg;
 	u32			gctl;
@@ -677,7 +675,6 @@ struct dwc3 {
 	u32			u1u2;
 	u32			maximum_speed;
 	u32			revision;
-	u32			mode;
 
 #define DWC3_REVISION_173A	0x5533173a
 #define DWC3_REVISION_175A	0x5533175a

drivers/usb/dwc3/platform_data.h

@@ -18,8 +18,10 @@
  */
 
 #include <linux/usb/ch9.h>
+#include <linux/usb/otg.h>
 
 struct dwc3_platform_data {
 	enum usb_device_speed maximum_speed;
+	enum usb_dr_mode dr_mode;
 	bool tx_fifo_resize;
 };