USB: OHCI: make ohci-s3c2410 a separate driver

Separate the Samsung OHCI S3C24xx/S3C64xx host controller driver
from ohci-hcd host code so that it can be built as a separate
driver module.This work is part of enabling multi-platform.

Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org>
Signed-off-by: Deepak Saxena <dsaxena@linaro.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 66 insertions, 89 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 152c68090cd9..f0f9bf6e20de 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -381,6 +381,14 @@ config USB_OHCI_HCD_SPEAR
           Enables support for the on-chip OHCI controller on
           ST SPEAr chips.
 
+config USB_OHCI_HCD_S3C2410
+        tristate "OHCI support for Samsung S3C24xx/S3C64xx SoC series"
+        depends on USB_OHCI_HCD && (ARCH_S3C24XX || ARCH_S3C64XX)
+        default y
+        ---help---
+          Enables support for the on-chip OHCI controller on
+          S3C24xx/S3C64xx chips.
+
 config USB_OHCI_HCD_AT91
         tristate "Support for Atmel on-chip OHCI USB controller"
         depends on USB_OHCI_HCD && ARCH_AT91
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 15dc677e7889..96d18dde672c 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_USB_OHCI_HCD_OMAP1)	+= ohci-omap.o
 obj-$(CONFIG_USB_OHCI_HCD_OMAP3)        += ohci-omap3.o
 obj-$(CONFIG_USB_OHCI_HCD_SPEAR)        += ohci-spear.o
 obj-$(CONFIG_USB_OHCI_HCD_AT91) += ohci-at91.o
+obj-$(CONFIG_USB_OHCI_HCD_S3C2410)      += ohci-s3c2410.o
 
 obj-$(CONFIG_USB_UHCI_HCD)      += uhci-hcd.o
 obj-$(CONFIG_USB_FHCI_HCD)      += fhci.o
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 2fdaaf81472d..fcfcab503250 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -1177,11 +1177,6 @@ MODULE_LICENSE ("GPL");
 #define SA1111_DRIVER           ohci_hcd_sa1111_driver
 #endif
 
-#if defined(CONFIG_ARCH_S3C24XX) || defined(CONFIG_ARCH_S3C64XX)
-#include "ohci-s3c2410.c"
-#define S3C2410_PLATFORM_DRIVER ohci_hcd_s3c2410_driver
-#endif
-
 #if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
 #include "ohci-pxa27x.c"
 #define PLATFORM_DRIVER         ohci_hcd_pxa27x_driver
@@ -1293,12 +1288,6 @@ static int __init ohci_hcd_mod_init(void)
                 goto error_tmio;
 #endif
 
-#ifdef S3C2410_PLATFORM_DRIVER
-        retval = platform_driver_register(&S3C2410_PLATFORM_DRIVER);
-        if (retval < 0)
-                goto error_s3c2410;
-#endif
-
 #ifdef EP93XX_PLATFORM_DRIVER
         retval = platform_driver_register(&EP93XX_PLATFORM_DRIVER);
         if (retval < 0)
@@ -1332,10 +1321,6 @@ static int __init ohci_hcd_mod_init(void)
         platform_driver_unregister(&EP93XX_PLATFORM_DRIVER);
  error_ep93xx:
 #endif
-#ifdef S3C2410_PLATFORM_DRIVER
-        platform_driver_unregister(&S3C2410_PLATFORM_DRIVER);
- error_s3c2410:
-#endif
 #ifdef TMIO_OHCI_DRIVER
         platform_driver_unregister(&TMIO_OHCI_DRIVER);
  error_tmio:
@@ -1382,9 +1367,6 @@ static void __exit ohci_hcd_mod_exit(void)
 #ifdef EP93XX_PLATFORM_DRIVER
         platform_driver_unregister(&EP93XX_PLATFORM_DRIVER);
 #endif
-#ifdef S3C2410_PLATFORM_DRIVER
-        platform_driver_unregister(&S3C2410_PLATFORM_DRIVER);
-#endif
 #ifdef TMIO_OHCI_DRIVER
         platform_driver_unregister(&TMIO_OHCI_DRIVER);
 #endif
diff --git a/drivers/usb/host/ohci-s3c2410.c b/drivers/usb/host/ohci-s3c2410.c
index 4919afa4125e..be3429e08d90 100644
--- a/drivers/usb/host/ohci-s3c2410.c
+++ b/drivers/usb/host/ohci-s3c2410.c
@@ -19,19 +19,36 @@
  * This file is licenced under the GPL.
 */
 
-#include <linux/platform_device.h>
 #include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
 #include <linux/platform_data/usb-ohci-s3c2410.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ohci.h"
+
 
 #define valid_port(idx) ((idx) == 1 || (idx) == 2)
 
 /* clock device associated with the hcd */
 
+
+#define DRIVER_DESC "OHCI S3C2410 driver"
+
+static const char hcd_name[] = "ohci-s3c2410";
+
 static struct clk *clk;
 static struct clk *usb_clk;
 
 /* forward definitions */
 
+static int (*orig_ohci_hub_control)(struct usb_hcd  *hcd, u16 typeReq,
+                        u16 wValue, u16 wIndex, char *buf, u16 wLength);
+static int (*orig_ohci_hub_status_data)(struct usb_hcd *hcd, char *buf);
+
 static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc);
 
 /* conversion functions */
@@ -93,7 +110,7 @@ ohci_s3c2410_hub_status_data(struct usb_hcd *hcd, char *buf)
         int orig;
         int portno;
 
-        orig  = ohci_hub_status_data(hcd, buf);
+        orig = orig_ohci_hub_status_data(hcd, buf);
 
         if (info == NULL)
                 return orig;
@@ -164,7 +181,7 @@ static int ohci_s3c2410_hub_control(
          * process the request straight away and exit */
 
         if (info == NULL) {
-                ret = ohci_hub_control(hcd, typeReq, wValue,
+                ret = orig_ohci_hub_control(hcd, typeReq, wValue,
                                        wIndex, buf, wLength);
                 goto out;
         }
@@ -214,7 +231,7 @@ static int ohci_s3c2410_hub_control(
                 break;
         }
 
-        ret = ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
+        ret = orig_ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
         if (ret)
                 goto out;
 
@@ -374,8 +391,6 @@ static int usb_hcd_s3c2410_probe(const struct hc_driver *driver,
 
         s3c2410_start_hc(dev, hcd);
 
-        ohci_hcd_init(hcd_to_ohci(hcd));
-
         retval = usb_add_hcd(hcd, dev->resource[1].start, 0);
         if (retval != 0)
                 goto err_ioremap;
@@ -392,71 +407,7 @@ static int usb_hcd_s3c2410_probe(const struct hc_driver *driver,
 
 /*-------------------------------------------------------------------------*/
 
-static int
-ohci_s3c2410_start(struct usb_hcd *hcd)
-{
-        struct ohci_hcd *ohci = hcd_to_ohci(hcd);
-        int ret;
-
-        ret = ohci_init(ohci);
-        if (ret < 0)
-                return ret;
-
-        ret = ohci_run(ohci);
-        if (ret < 0) {
-                dev_err(hcd->self.controller, "can't start %s\n",
-                        hcd->self.bus_name);
-                ohci_stop(hcd);
-                return ret;
-        }
-
-        return 0;
-}
-
-
-static const struct hc_driver ohci_s3c2410_hc_driver = {
-        .description =          hcd_name,
-        .product_desc =         "S3C24XX OHCI",
-        .hcd_priv_size =        sizeof(struct ohci_hcd),
-
-        /*
-         * generic hardware linkage
-         */
-        .irq =                  ohci_irq,
-        .flags =                HCD_USB11 | HCD_MEMORY,
-
-        /*
-         * basic lifecycle operations
-         */
-        .start =                ohci_s3c2410_start,
-        .stop =                 ohci_stop,
-        .shutdown =             ohci_shutdown,
-
-        /*
-         * 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_s3c2410_hub_status_data,
-        .hub_control =          ohci_s3c2410_hub_control,
-#ifdef  CONFIG_PM
-        .bus_suspend =          ohci_bus_suspend,
-        .bus_resume =           ohci_bus_resume,
-#endif
-        .start_port_reset =     ohci_start_port_reset,
-};
-
-/* device driver */
+static struct hc_driver __read_mostly ohci_s3c2410_hc_driver;
 
 static int ohci_hcd_s3c2410_drv_probe(struct platform_device *pdev)
 {
@@ -533,4 +484,39 @@ static struct platform_driver ohci_hcd_s3c2410_driver = {
         },
 };
 
+static int __init ohci_s3c2410_init(void)
+{
+        if (usb_disabled())
+                return -ENODEV;
+
+        pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+        ohci_init_driver(&ohci_s3c2410_hc_driver, NULL);
+
+        /*
+         * The Samsung HW has some unusual quirks, which require
+         * Sumsung-specific workarounds. We override certain hc_driver
+         * functions here to achieve that. We explicitly do not enhance
+         * ohci_driver_overrides to allow this more easily, since this
+         * is an unusual case, and we don't want to encourage others to
+         * override these functions by making it too easy.
+         */
+
+        orig_ohci_hub_control = ohci_s3c2410_hc_driver.hub_control;
+        orig_ohci_hub_status_data = ohci_s3c2410_hc_driver.hub_status_data;
+
+        ohci_s3c2410_hc_driver.hub_status_data  = ohci_s3c2410_hub_status_data;
+        ohci_s3c2410_hc_driver.hub_control      = ohci_s3c2410_hub_control;
+
+        return platform_driver_register(&ohci_hcd_s3c2410_driver);
+}
+module_init(ohci_s3c2410_init);
+
+static void __exit ohci_s3c2410_cleanup(void)
+{
+        platform_driver_unregister(&ohci_hcd_s3c2410_driver);
+}
+module_exit(ohci_s3c2410_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:s3c2410-ohci");