usb: gadget: ci13xxx: convert to platform device

Let's break ci13xxx driver into a separate udc driver and platform
drivers _pci and _msm, which will create a platform device for each pci
(or msm) device found. The approach was introduced by Felipe in dwc3
driver and there seems to be no reason not to use it.

msm related code is only compile-tested.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/Kconfig

@@ -378,16 +378,28 @@ config USB_FSL_QE
 	   Set CONFIG_USB_GADGET to "m" to build this driver as a
 	   dynamically linked module called "fsl_qe_udc".
 
+config USB_CHIPIDEA_UDC
+	tristate "ChipIdea UDC driver"
+	select USB_GADGET_DUALSPEED
+	help
+	  This module contains the ChipIdea USB device controller driver;
+	  you will also need platform driver like ci13xxx_pci or ci13xxx_msm
+	  to use it.
+
+	  Say "y" to link the driver statically, or "m" to build a
+	  dynamically linked module called "ci13xxx_udc", which will serve
+	  as a driver for ChipIdea udc on different platforms.
+
 config USB_CI13XXX_PCI
 	tristate "MIPS USB CI13xxx PCI UDC"
-	depends on PCI
+	depends on PCI && USB_CHIPIDEA_UDC
 	select USB_GADGET_DUALSPEED
 	help
 	  MIPS USB IP core family device controller
 	  Currently it only supports IP part number CI13412
 
 	  Say "y" to link the driver statically, or "m" to build a
-	  dynamically linked module called "ci13xxx_udc" and force all
+	  dynamically linked module called "ci13xxx_pci" and force all
 	  gadget drivers to also be dynamically linked.
 
 config USB_NET2272
@@ -484,7 +496,7 @@ config USB_EG20T
 
 config USB_CI13XXX_MSM
 	tristate "MIPS USB CI13xxx for MSM"
-	depends on ARCH_MSM
+	depends on ARCH_MSM && USB_CHIPIDEA_UDC
 	select USB_GADGET_DUALSPEED
 	select USB_MSM_OTG
 	help

drivers/usb/gadget/Makefile

@@ -22,6 +22,7 @@ fsl_usb2_udc-$(CONFIG_ARCH_MXC)	+= fsl_mxc_udc.o
 obj-$(CONFIG_USB_M66592)	+= m66592-udc.o
 obj-$(CONFIG_USB_R8A66597)	+= r8a66597-udc.o
 obj-$(CONFIG_USB_FSL_QE)	+= fsl_qe_udc.o
+obj-$(CONFIG_USB_CHIPIDEA_UDC)	+= ci13xxx_udc.o
 obj-$(CONFIG_USB_CI13XXX_PCI)	+= ci13xxx_pci.o
 obj-$(CONFIG_USB_S3C_HSOTG)	+= s3c-hsotg.o
 obj-$(CONFIG_USB_S3C_HSUDC)	+= s3c-hsudc.o

drivers/usb/gadget/ci13xxx_msm.c

@@ -10,16 +10,12 @@
 #include <linux/pm_runtime.h>
 #include <linux/usb/msm_hsusb_hw.h>
 #include <linux/usb/ulpi.h>
+#include <linux/usb/gadget.h>
 
-#include "ci13xxx_udc.c"
+#include "ci13xxx_udc.h"
 
 #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;
@@ -60,54 +56,40 @@ static struct ci13xxx_udc_driver ci13xxx_msm_udc_driver = {
 
 static int ci13xxx_msm_probe(struct platform_device *pdev)
 {
-	struct resource *res;
-	void __iomem *regs;
-	int irq;
+	struct platform_device *plat_ci;
 	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");
+	plat_ci = platform_device_alloc("ci_udc", -1);
+	if (!plat_ci) {
+		dev_err(&pdev->dev, "can't allocate ci_udc platform device\n");
 		return -ENOMEM;
 	}
 
-	ret = udc_probe(&ci13xxx_msm_udc_driver, &pdev->dev, regs,
-			DEF_CAPOFFSET);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "udc_probe failed\n");
-		goto iounmap;
+	ret = platform_device_add_resources(plat_ci, pdev->resource,
+					    pdev->num_resources);
+	if (ret) {
+		dev_err(&pdev->dev, "can't add resources to platform device\n");
+		goto put_platform;
 	}
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(&pdev->dev, "IRQ not found\n");
-		ret = -ENXIO;
-		goto udc_remove;
-	}
+	ret = platform_device_add_data(plat_ci, &ci13xxx_msm_udc_driver,
+				       sizeof(ci13xxx_msm_udc_driver));
+	if (ret)
+		goto put_platform;
 
-	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;
-	}
+	ret = platform_device_add(plat_ci);
+	if (ret)
+		goto put_platform;
 
 	pm_runtime_no_callbacks(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
 	return 0;
 
-udc_remove:
-	udc_remove();
-iounmap:
-	iounmap(regs);
+put_platform:
+	platform_device_put(plat_ci);
 
 	return ret;
 }

drivers/usb/gadget/ci13xxx_pci.c

@@ -10,10 +10,13 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/platform_device.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/usb/gadget.h>
 
-#include "ci13xxx_udc.c"
+#include "ci13xxx_udc.h"
 
 /* driver name */
 #define UDC_DRIVER_NAME   "ci13xxx_pci"
@@ -21,25 +24,14 @@
 /******************************************************************************
  * PCI block
  *****************************************************************************/
-/**
- * ci13xxx_pci_irq: interrut handler
- * @irq:  irq number
- * @pdev: USB Device Controller interrupt source
- *
- * This function returns IRQ_HANDLED if the IRQ has been handled
- * This is an ISR don't trace, use attribute interface instead
- */
-static irqreturn_t ci13xxx_pci_irq(int irq, void *pdev)
-{
-	if (irq == 0) {
-		dev_err(&((struct pci_dev *)pdev)->dev, "Invalid IRQ0 usage!");
-		return IRQ_HANDLED;
-	}
-	return udc_irq();
-}
+struct ci13xxx_udc_driver pci_driver = {
+	.name		= UDC_DRIVER_NAME,
+	.capoffset	= DEF_CAPOFFSET,
+};
 
-static struct ci13xxx_udc_driver ci13xxx_pci_udc_driver = {
+struct ci13xxx_udc_driver langwell_pci_driver = {
 	.name		= UDC_DRIVER_NAME,
+	.capoffset	= 0,
 };
 
 /**
@@ -54,9 +46,10 @@ static struct ci13xxx_udc_driver ci13xxx_pci_udc_driver = {
 static int __devinit ci13xxx_pci_probe(struct pci_dev *pdev,
 				       const struct pci_device_id *id)
 {
-	void __iomem *regs = NULL;
-	uintptr_t capoffset = DEF_CAPOFFSET;
-	int retval = 0;
+	struct ci13xxx_udc_driver *driver = (void *)id->driver_data;
+	struct platform_device *plat_ci;
+	struct resource res[3];
+	int retval = 0, nres = 2;
 
 	if (id == NULL)
 		return -EINVAL;
@@ -71,45 +64,50 @@ static int __devinit ci13xxx_pci_probe(struct pci_dev *pdev,
 		goto disable_device;
 	}
 
-	retval = pci_request_regions(pdev, UDC_DRIVER_NAME);
-	if (retval)
-		goto disable_device;
-
-	/* BAR 0 holds all the registers */
-	regs = pci_iomap(pdev, 0, 0);
-	if (!regs) {
-		dev_err(&pdev->dev, "Error mapping memory!");
-		retval = -EFAULT;
-		goto release_regions;
-	}
-	pci_set_drvdata(pdev, (__force void *)regs);
-
+	pci_set_power_state(pdev, PCI_D0);
 	pci_set_master(pdev);
 	pci_try_set_mwi(pdev);
 
-	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
-		capoffset = 0;
+	plat_ci = platform_device_alloc("ci_udc", -1);
+	if (!plat_ci) {
+		dev_err(&pdev->dev, "can't allocate ci_udc platform device\n");
+		retval = -ENOMEM;
+		goto disable_device;
+	}
 
-	retval = udc_probe(&ci13xxx_pci_udc_driver, &pdev->dev, regs,
-			   capoffset);
+	memset(res, 0, sizeof(res));
+	res[0].start	= pci_resource_start(pdev, 0);
+	res[0].end	= pci_resource_end(pdev, 0);
+	res[0].flags	= IORESOURCE_MEM;
+	res[1].start	= pdev->irq;
+	res[1].flags	= IORESOURCE_IRQ;
+
+	retval = platform_device_add_resources(plat_ci, res, nres);
+	if (retval) {
+		dev_err(&pdev->dev, "can't add resources to platform device\n");
+		goto put_platform;
+	}
+
+	retval = platform_device_add_data(plat_ci, driver, sizeof(*driver));
 	if (retval)
-		goto iounmap;
+		goto put_platform;
 
-	/* our device does not have MSI capability */
+	dma_set_coherent_mask(&plat_ci->dev, pdev->dev.coherent_dma_mask);
+	plat_ci->dev.dma_mask = pdev->dev.dma_mask;
+	plat_ci->dev.dma_parms = pdev->dev.dma_parms;
+	plat_ci->dev.parent = &pdev->dev;
 
-	retval = request_irq(pdev->irq, ci13xxx_pci_irq, IRQF_SHARED,
-			     UDC_DRIVER_NAME, pdev);
+	pci_set_drvdata(pdev, plat_ci);
+
+	retval = platform_device_add(plat_ci);
 	if (retval)
-		goto gadget_remove;
+		goto put_platform;
 
 	return 0;
 
- gadget_remove:
-	udc_remove();
- iounmap:
-	pci_iounmap(pdev, regs);
- release_regions:
-	pci_release_regions(pdev);
+ put_platform:
+	pci_set_drvdata(pdev, NULL);
+	platform_device_put(plat_ci);
  disable_device:
 	pci_disable_device(pdev);
  done:
@@ -126,10 +124,10 @@ static int __devinit ci13xxx_pci_probe(struct pci_dev *pdev,
  */
 static void __devexit ci13xxx_pci_remove(struct pci_dev *pdev)
 {
-	free_irq(pdev->irq, pdev);
-	udc_remove();
-	pci_iounmap(pdev, (__force void __iomem *)pci_get_drvdata(pdev));
-	pci_release_regions(pdev);
+	struct platform_device *plat_ci = pci_get_drvdata(pdev);
+
+	platform_device_unregister(plat_ci);
+	pci_set_drvdata(pdev, NULL);
 	pci_disable_device(pdev);
 }
 
@@ -140,10 +138,22 @@ static void __devexit ci13xxx_pci_remove(struct pci_dev *pdev)
  * Check "pci.h" for details
  */
 static DEFINE_PCI_DEVICE_TABLE(ci13xxx_pci_id_table) = {
-	{ PCI_DEVICE(0x153F, 0x1004) },
-	{ PCI_DEVICE(0x153F, 0x1006) },
-	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0811) },
-	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0829) },
+	{
+		PCI_DEVICE(0x153F, 0x1004),
+		.driver_data = (kernel_ulong_t)&pci_driver,
+	},
+	{
+		PCI_DEVICE(0x153F, 0x1006),
+		.driver_data = (kernel_ulong_t)&pci_driver,
+	},
+	{
+		PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0811),
+		.driver_data = (kernel_ulong_t)&langwell_pci_driver,
+	},
+	{
+		PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0829),
+		.driver_data = (kernel_ulong_t)&langwell_pci_driver,
+	},
 	{ 0, 0, 0, 0, 0, 0, 0 /* end: all zeroes */ }
 };
 MODULE_DEVICE_TABLE(pci, ci13xxx_pci_id_table);

drivers/usb/gadget/ci13xxx_udc.c

@@ -55,6 +55,8 @@
 #include <linux/dmapool.h>
 #include <linux/dma-mapping.h>
 #include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/irq.h>
@@ -67,7 +69,6 @@
 
 #include "ci13xxx_udc.h"
 
-
 /******************************************************************************
  * DEFINE
  *****************************************************************************/
@@ -2806,7 +2807,7 @@ static int ci13xxx_stop(struct usb_gadget_driver *driver)
  * This function returns IRQ_HANDLED if the IRQ has been handled
  * It locks access to registers
  */
-static irqreturn_t udc_irq(void)
+static irqreturn_t udc_irq(int irq, void *data)
 {
 	struct ci13xxx *udc = _udc;
 	irqreturn_t retval;
@@ -2901,7 +2902,7 @@ static void udc_release(struct device *dev)
  * Kernel assumes 32-bit DMA operations by default, no need to dma_set_mask
  */
 static int udc_probe(struct ci13xxx_udc_driver *driver, struct device *dev,
-		     void __iomem *regs, uintptr_t capoffset)
+		     void __iomem *regs)
 {
 	struct ci13xxx *udc;
 	int retval = 0;
@@ -2935,7 +2936,7 @@ static int udc_probe(struct ci13xxx_udc_driver *driver, struct device *dev,
 	udc->gadget.dev.parent   = dev;
 	udc->gadget.dev.release  = udc_release;
 
-	retval = hw_device_init(udc, regs, capoffset);
+	retval = hw_device_init(udc, regs, driver->capoffset);
 	if (retval < 0)
 		goto free_udc;
 
@@ -3033,3 +3034,72 @@ static void udc_remove(void)
 	kfree(udc);
 	_udc = NULL;
 }
+
+static int __devinit ci_udc_probe(struct platform_device *pdev)
+{
+	struct device	*dev = &pdev->dev;
+	struct ci13xxx_udc_driver *driver = dev->platform_data;
+	struct resource	*res;
+	void __iomem	*base;
+	int		ret;
+
+	if (!driver) {
+		dev_err(dev, "platform data missing\n");
+		return -ENODEV;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(dev, "missing resource\n");
+		return -ENODEV;
+	}
+
+	base = devm_request_and_ioremap(dev, res);
+	if (!res) {
+		dev_err(dev, "can't request and ioremap resource\n");
+		return -ENOMEM;
+	}
+
+	ret = udc_probe(driver, dev, base);
+	if (ret)
+		return ret;
+
+	_udc->irq = platform_get_irq(pdev, 0);
+	if (_udc->irq < 0) {
+		dev_err(dev, "missing IRQ\n");
+		ret = -ENODEV;
+		goto out;
+	}
+
+	ret = request_irq(_udc->irq, udc_irq, IRQF_SHARED, driver->name, _udc);
+
+out:
+	if (ret)
+		udc_remove();
+
+	return ret;
+}
+
+static int __devexit ci_udc_remove(struct platform_device *pdev)
+{
+	free_irq(_udc->irq, _udc);
+	udc_remove();
+
+	return 0;
+}
+
+static struct platform_driver ci_udc_driver = {
+	.probe	= ci_udc_probe,
+	.remove	= __devexit_p(ci_udc_remove),
+	.driver	= {
+		.name	= "ci_udc",
+	},
+};
+
+module_platform_driver(ci_udc_driver);
+
+MODULE_ALIAS("platform:ci_udc");
+MODULE_ALIAS("platform:ci13xxx");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
+MODULE_DESCRIPTION("ChipIdea UDC Driver");

drivers/usb/gadget/ci13xxx_udc.h

@@ -103,6 +103,8 @@ struct ci13xxx_ep {
 struct ci13xxx;
 struct ci13xxx_udc_driver {
 	const char	*name;
+	/* offset of the capability registers */
+	uintptr_t	 capoffset;
 	unsigned long	 flags;
 #define CI13XXX_REGS_SHARED		BIT(0)
 #define CI13XXX_REQUIRE_TRANSCEIVER	BIT(1)
@@ -144,6 +146,7 @@ struct ci13xxx {
 	u8                         test_mode;  /* the selected test mode */
 
 	struct hw_bank             hw_bank;
+	int			   irq;
 	struct usb_gadget_driver  *driver;     /* 3rd party gadget driver */
 	struct ci13xxx_udc_driver *udc_driver; /* device controller driver */
 	int                        vbus_active; /* is VBUS active */