USB: OHCI: make ohci-pci a separate driver

This patch splits the PCI portion of ohci-hcd out into its
own separate driver module, called ohci-pci.

The major point of difficulty lies in ohci-pci's many vendor- and
device-specific workarounds.  Some of them have to be applied before
calling ohci_start() some after, which necessitates a fair amount of
code motion.  The other platform drivers require much smaller changes.

The complete sb800_prefetch() function moved to ohci-q.c,because its
only related to ohci-pci driver.

USB_OHCI_HCD_PCI symbol no longer dependence on STB03xxx, PPC_MPC52xx and
USB_OHCI_HCD_PPC_OF that's what removed.

V2:
  - few specific content of pci related code in ohci_pci_start function has been moved to ohci_pci_reset
    and rest of the generic code is written in ohci_start of ohci-hcd.c file.
V3:
 - ohci_restart() has been called in ohci_pci_reset() function for to reset the ohci pci.

V4:
 -sb800_prefetch() moved to ohci-q.c,because its only related to ohci-pci.
 -no longer _creating_ CONFIG_USB_OHCI_PCI,creating CONFIG_USB_OHCI_HCD_PCI.
 -overrides renamed with pci_override,its giving proper meaning.

V5:
 -sb800_prefetch() moved to pci-quirks.c,because its only related to pci.

V6:
 -sb800_prefetch() function has been moved to pci-quirks.c made as separate patch in 2/3.
 -Most of the generic ohci pci changes moved in 2/3 patch,now this is complete  ohci-pci separation patch.

V7:
 -Unrelated include file has been removed from ohci.h file.

V8:
 -USB_OHCI_HCD_PCI symbol does not dependence on STB03xxx, PPC_MPC52xx and USB_OHCI_HCD_PPC_OF.
Signed-off-by: NManjunath Goudar <manjunath.goudar@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/Kconfig

@@ -357,7 +357,7 @@ config USB_FUSBH200_HCD
 	module will be called fusbh200-hcd.
 
 config USB_OHCI_HCD
-	tristate "OHCI HCD support"
+	tristate "OHCI HCD (USB 1.1) support"
 	depends on USB_ARCH_HAS_OHCI
 	select ISP1301_OMAP if MACH_OMAP_H2 || MACH_OMAP_H3
 	depends on USB_ISP1301 || !ARCH_LPC32XX
@@ -426,8 +426,8 @@ config USB_OHCI_HCD_PPC_OF
 	default USB_OHCI_HCD_PPC_OF_BE || USB_OHCI_HCD_PPC_OF_LE
 
 config USB_OHCI_HCD_PCI
-	bool "OHCI support for PCI-bus USB controllers"
-	depends on PCI && (STB03xxx || PPC_MPC52xx || USB_OHCI_HCD_PPC_OF)
+	tristate "OHCI support for PCI-bus USB controllers"
+	depends on PCI
 	default y
 	select USB_OHCI_LITTLE_ENDIAN
 	---help---

drivers/usb/host/Makefile

@@ -37,7 +37,10 @@ obj-$(CONFIG_USB_EHCI_MSM)	+= ehci-msm.o
 obj-$(CONFIG_USB_OXU210HP_HCD)	+= oxu210hp-hcd.o
 obj-$(CONFIG_USB_ISP116X_HCD)	+= isp116x-hcd.o
 obj-$(CONFIG_USB_ISP1362_HCD)	+= isp1362-hcd.o
+
 obj-$(CONFIG_USB_OHCI_HCD)	+= ohci-hcd.o
+obj-$(CONFIG_USB_OHCI_HCD_PCI)	+= ohci-pci.o
+
 obj-$(CONFIG_USB_UHCI_HCD)	+= uhci-hcd.o
 obj-$(CONFIG_USB_FHCI_HCD)	+= fhci.o
 obj-$(CONFIG_USB_XHCI_HCD)	+= xhci-hcd.o

drivers/usb/host/ohci-hcd.c

@@ -1172,11 +1172,6 @@ MODULE_AUTHOR (DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE ("GPL");
 
-#ifdef CONFIG_PCI
-#include "ohci-pci.c"
-#define PCI_DRIVER		ohci_pci_driver
-#endif
-
 #if defined(CONFIG_ARCH_SA1100) && defined(CONFIG_SA1111)
 #include "ohci-sa1111.c"
 #define SA1111_DRIVER		ohci_hcd_sa1111_driver
@@ -1272,7 +1267,7 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER		ohci_platform_driver
 #endif
 
-#if	!defined(PCI_DRIVER) &&		\
+#if	!IS_ENABLED(CONFIG_USB_OHCI_HCD_PCI) &&	\
 	!defined(PLATFORM_DRIVER) &&	\
 	!defined(OMAP1_PLATFORM_DRIVER) &&	\
 	!defined(OMAP3_PLATFORM_DRIVER) &&	\
@@ -1347,12 +1342,6 @@ static int __init ohci_hcd_mod_init(void)
 		goto error_sa1111;
 #endif
 
-#ifdef PCI_DRIVER
-	retval = pci_register_driver(&PCI_DRIVER);
-	if (retval < 0)
-		goto error_pci;
-#endif
-
 #ifdef SM501_OHCI_DRIVER
 	retval = platform_driver_register(&SM501_OHCI_DRIVER);
 	if (retval < 0)
@@ -1446,10 +1435,6 @@ static int __init ohci_hcd_mod_init(void)
 	platform_driver_unregister(&SM501_OHCI_DRIVER);
  error_sm501:
 #endif
-#ifdef PCI_DRIVER
-	pci_unregister_driver(&PCI_DRIVER);
- error_pci:
-#endif
 #ifdef SA1111_DRIVER
 	sa1111_driver_unregister(&SA1111_DRIVER);
  error_sa1111:
@@ -1514,9 +1499,6 @@ static void __exit ohci_hcd_mod_exit(void)
 #ifdef SM501_OHCI_DRIVER
 	platform_driver_unregister(&SM501_OHCI_DRIVER);
 #endif
-#ifdef PCI_DRIVER
-	pci_unregister_driver(&PCI_DRIVER);
-#endif
 #ifdef SA1111_DRIVER
 	sa1111_driver_unregister(&SA1111_DRIVER);
 #endif

drivers/usb/host/ohci-pci.c

@@ -14,12 +14,19 @@
  * This file is licenced under the GPL.
  */
 
-#ifndef CONFIG_PCI
-#error "This file is PCI bus glue.  CONFIG_PCI must be defined."
-#endif
-
-#include <linux/pci.h>
 #include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ohci.h"
+#include "pci-quirks.h"
+
+#define DRIVER_DESC "OHCI PCI platform driver"
+
+static const char hcd_name[] = "ohci-pci";
 
 
 /*-------------------------------------------------------------------------*/
@@ -229,10 +236,10 @@ static const struct pci_device_id ohci_pci_quirks[] = {
 static int ohci_pci_reset (struct usb_hcd *hcd)
 {
 	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);
+	struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
 	int ret = 0;
 
 	if (hcd->self.controller) {
-		struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
 		const struct pci_device_id *quirk_id;
 
 		quirk_id = pci_match_id(ohci_pci_quirks, pdev);
@@ -242,94 +249,25 @@ static int ohci_pci_reset (struct usb_hcd *hcd)
 			ret = quirk(hcd);
 		}
 	}
-	if (ret == 0) {
-		ohci_hcd_init (ohci);
-		return ohci_init (ohci);
-	}
-	return ret;
-}
-
-
-static int ohci_pci_start (struct usb_hcd *hcd)
-{
-	struct ohci_hcd	*ohci = hcd_to_ohci (hcd);
-	int		ret;
-
-#ifdef CONFIG_PM /* avoid warnings about unused pdev */
-	if (hcd->self.controller) {
-		struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
-
-		/* RWC may not be set for add-in PCI cards, since boot
-		 * firmware probably ignored them.  This transfers PCI
-		 * PM wakeup capabilities.
-		 */
-		if (device_can_wakeup(&pdev->dev))
-			ohci->hc_control |= OHCI_CTRL_RWC;
-	}
-#endif /* CONFIG_PM */
 
-	ret = ohci_run (ohci);
-	if (ret < 0) {
-		ohci_err (ohci, "can't start\n");
-		ohci_stop (hcd);
-	}
+	if (ret == 0)
+		ret = ohci_setup(hcd);
+	/*
+	* After ohci setup RWC may not be set for add-in PCI cards.
+	* This transfers PCI PM wakeup capabilities.
+	*/
+	if (device_can_wakeup(&pdev->dev))
+		ohci->hc_control |= OHCI_CTRL_RWC;
 	return ret;
 }
 
+static struct hc_driver __read_mostly ohci_pci_hc_driver;
 
-/*-------------------------------------------------------------------------*/
-
-static const struct hc_driver ohci_pci_hc_driver = {
-	.description =		hcd_name,
-	.product_desc =		"OHCI Host Controller",
-	.hcd_priv_size =	sizeof(struct ohci_hcd),
-
-	/*
-	 * generic hardware linkage
-	 */
-	.irq =			ohci_irq,
-	.flags =		HCD_MEMORY | HCD_USB11,
-
-	/*
-	 * basic lifecycle operations
-	 */
+static const struct ohci_driver_overrides pci_overrides __initconst = {
+	.product_desc =		"OHCI PCI host controller",
 	.reset =		ohci_pci_reset,
-	.start =		ohci_pci_start,
-	.stop =			ohci_stop,
-	.shutdown =		ohci_shutdown,
-
-#ifdef	CONFIG_PM
-	.pci_suspend =		ohci_suspend,
-	.pci_resume =		ohci_resume,
-#endif
-
-	/*
-	 * managing i/o requests and associated device resources
-	 */
-	.urb_enqueue =		ohci_urb_enqueue,
-	.urb_dequeue =		ohci_urb_dequeue,
-	.endpoint_disable =	ohci_endpoint_disable,
-
-	/*
-	 * scheduling support
-	 */
-	.get_frame_number =	ohci_get_frame,
-
-	/*
-	 * root hub support
-	 */
-	.hub_status_data =	ohci_hub_status_data,
-	.hub_control =		ohci_hub_control,
-#ifdef	CONFIG_PM
-	.bus_suspend =		ohci_bus_suspend,
-	.bus_resume =		ohci_bus_resume,
-#endif
-	.start_port_reset =	ohci_start_port_reset,
 };
 
-/*-------------------------------------------------------------------------*/
-
-
 static const struct pci_device_id pci_ids [] = { {
 	/* handle any USB OHCI controller */
 	PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_OHCI, ~0),
@@ -357,3 +295,24 @@ static struct pci_driver ohci_pci_driver = {
 	},
 #endif
 };
+
+static int __init ohci_pci_init(void)
+{
+	if (usb_disabled())
+		return -ENODEV;
+
+	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+
+	ohci_init_driver(&ohci_pci_hc_driver, &pci_overrides);
+	return pci_register_driver(&ohci_pci_driver);
+}
+module_init(ohci_pci_init);
+
+static void __exit ohci_pci_cleanup(void)
+{
+	pci_unregister_driver(&ohci_pci_driver);
+}
+module_exit(ohci_pci_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");