usb: cdns3: Moves reusable code to separate module

Patch moves common reusable code used by cdns3 and cdnsp driver
to cdns-usb-common library. This library include core.c, drd.c
and host.c files.
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
Tested-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>

drivers/usb/cdns3/Kconfig

+config CDNS_USB_COMMON
+	tristate
+
+config CDNS_USB_HOST
+	bool
+
 config USB_CDNS3
 	tristate "Cadence USB3 Dual-Role Controller"
 	depends on USB_SUPPORT && (USB || USB_GADGET) && HAS_DMA
 	select USB_XHCI_PLATFORM if USB_XHCI_HCD
 	select USB_ROLE_SWITCH
+	select CDNS_USB_COMMON
 	help
 	  Say Y here if your system has a Cadence USB3 dual-role controller.
 	  It supports: dual-role switch, Host-only, and Peripheral-only.
@@ -25,6 +32,7 @@ config USB_CDNS3_GADGET
 config USB_CDNS3_HOST
 	bool "Cadence USB3 host controller"
 	depends on USB=y || USB=USB_CDNS3
+	select CDNS_USB_HOST
 	help
 	  Say Y here to enable host controller functionality of the
 	  Cadence driver.

drivers/usb/cdns3/Makefile

@@ -2,17 +2,19 @@
 # define_trace.h needs to know how to find our header
 CFLAGS_trace.o				:= -I$(src)
 
-cdns3-y					:= cdns3-plat.o core.o drd.o
+cdns-usb-common-y			:= core.o drd.o
+cdns3-y					:= cdns3-plat.o
 
 obj-$(CONFIG_USB_CDNS3)			+= cdns3.o
+obj-$(CONFIG_CDNS_USB_COMMON)		+= cdns-usb-common.o
+
+cdns-usb-common-$(CONFIG_CDNS_USB_HOST) += host.o
 cdns3-$(CONFIG_USB_CDNS3_GADGET)	+= gadget.o ep0.o
 
 ifneq ($(CONFIG_USB_CDNS3_GADGET),)
 cdns3-$(CONFIG_TRACING)			+= trace.o
 endif
 
-cdns3-$(CONFIG_USB_CDNS3_HOST)		+= host.o
-
 obj-$(CONFIG_USB_CDNS3_PCI_WRAP)	+= cdns3-pci-wrap.o
 obj-$(CONFIG_USB_CDNS3_TI)		+= cdns3-ti.o
 obj-$(CONFIG_USB_CDNS3_IMX)		+= cdns3-imx.o

drivers/usb/cdns3/cdns3-plat.c

@@ -18,6 +18,7 @@
 #include <linux/pm_runtime.h>
 
 #include "core.h"
+#include "gadget-export.h"
 
 static int set_phy_power_on(struct cdns3 *cdns)
 {
@@ -134,6 +135,7 @@ static int cdns3_plat_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_phy_power_on;
 
+	cdns->gadget_init = cdns3_gadget_init;
 	ret = cdns3_init(cdns);
 	if (ret)
 		goto err_cdns_init;

drivers/usb/cdns3/core.c

@@ -19,10 +19,8 @@
 #include <linux/io.h>
 #include <linux/pm_runtime.h>
 
-#include "gadget.h"
 #include "core.h"
 #include "host-export.h"
-#include "gadget-export.h"
 #include "drd.h"
 
 static int cdns3_idle_init(struct cdns3 *cdns);
@@ -147,7 +145,11 @@ static int cdns3_core_init_role(struct cdns3 *cdns)
 	}
 
 	if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
-		ret = cdns3_gadget_init(cdns);
+		if (cdns->gadget_init)
+			ret = cdns->gadget_init(cdns);
+		else
+			ret = -ENXIO;
+
 		if (ret) {
 			dev_err(dev, "Device initialization failed with %d\n",
 				ret);
@@ -477,6 +479,7 @@ int cdns3_init(struct cdns3 *cdns)
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(cdns3_init);
 
 /**
  * cdns3_remove - unbind drd driver and clean up
@@ -491,6 +494,7 @@ int cdns3_remove(struct cdns3 *cdns)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(cdns3_remove);
 
 #ifdef CONFIG_PM_SLEEP
 int cdns3_suspend(struct cdns3 *cdns)
@@ -509,6 +513,7 @@ int cdns3_suspend(struct cdns3 *cdns)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(cdns3_suspend);
 
 int cdns3_resume(struct cdns3 *cdns, u8 set_active)
 {
@@ -525,4 +530,11 @@ int cdns3_resume(struct cdns3 *cdns, u8 set_active)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(cdns3_resume);
 #endif /* CONFIG_PM_SLEEP */
+
+MODULE_AUTHOR("Peter Chen <peter.chen@nxp.com>");
+MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
+MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
+MODULE_DESCRIPTION("Cadence USBSS and USBSSP DRD Driver");
+MODULE_LICENSE("GPL");

drivers/usb/cdns3/core.h

@@ -78,6 +78,7 @@ struct cdns3_platform_data {
  * @pdata: platform data from glue layer
  * @lock: spinlock structure
  * @xhci_plat_data: xhci private data structure pointer
+ * @gadget_init: pointer to gadget initialization function
  */
 struct cdns3 {
 	struct device			*dev;
@@ -115,6 +116,8 @@ struct cdns3 {
 	struct cdns3_platform_data	*pdata;
 	spinlock_t			lock;
 	struct xhci_plat_priv		*xhci_plat_data;
+
+	int (*gadget_init)(struct cdns3 *cdns);
 };
 
 int cdns3_hw_role_switch(struct cdns3 *cdns);

drivers/usb/cdns3/drd.c

@@ -15,7 +15,6 @@
 #include <linux/iopoll.h>
 #include <linux/usb/otg.h>
 
-#include "gadget.h"
 #include "drd.h"
 #include "core.h"
 
@@ -226,6 +225,7 @@ int cdns3_drd_gadget_on(struct cdns3 *cdns)
 	phy_set_mode(cdns->usb3_phy, PHY_MODE_USB_DEVICE);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(cdns3_drd_gadget_on);
 
 /**
  * cdns3_drd_gadget_off - stop gadget.
@@ -249,6 +249,7 @@ void cdns3_drd_gadget_off(struct cdns3 *cdns)
 				  1, 2000000);
 	phy_set_mode(cdns->usb3_phy, PHY_MODE_INVALID);
 }
+EXPORT_SYMBOL_GPL(cdns3_drd_gadget_off);
 
 /**
  * cdns3_init_otg_mode - initialize drd controller