Re: [PATCH V4 6/6] USB: OHCI: make ohci-s3c2410 a separate driver

Hi Manjunath,

On Saturday 10 of August 2013 13:07:36 Manjunath Goudar wrote:

Separate the Samsung OHCI S3CXXXX 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 kernels on ARM; it would be nice to have in 3.12.

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 Cc: Arnd Bergmann arnd@arndb.de Cc: Greg KH greg@kroah.com Cc: linux-usb@vger.kernel.org

V2: -Set non-standard fields in ohci_s3c2410_hc_driver manually, rather than relying on an expanded struct ohci_driver_overrides. -Save orig_ohci_hub_control and orig_ohci_hub_status_data rather than relying on ohci_hub_control and hub_status_data being exported.

V3: -Kconfig wrong parentheses discription fixed. -ohci_setup() has been removed because it is called in .reset member of the ohci_hc_driver structure.

V4:

• Removed extra space before the '='.
• Moved /* forward definitions */ line before the declarations of

functions. --- drivers/usb/host/Kconfig | 8 +++ drivers/usb/host/Makefile | 1 + drivers/usb/host/ohci-hcd.c | 18 ------ drivers/usb/host/ohci-s3c2410.c | 128 +++++++++++++++++---------------------- 4 files changed, 66 insertions(+), 89 deletions(-)

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig index 693560a..795d14d 100644 --- a/drivers/usb/host/Kconfig +++ b/drivers/usb/host/Kconfig @@ -390,6 +390,14 @@ config USB_OHCI_HCD_SPEAR Enables support for the on-chip OHCI controller on ST SPEAr chips.

+config USB_OHCI_HCD_S3CXXXX

•    tristate "Support for S3CXXXX on-chip OHCI USB controller"
  

As far as I remember, you were supposed to keep the original name of this driver, as I suggested in previous iteration of this patch and you agreed. S3CXXXX is totally confusing when it's about Samsung SoC naming.

So here the config entry would be USB_OHCI_HCD_S3C2410 and I would call it "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
  

•      S3CXXXX chips.
  

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 a0ac663..d3e9e66 100644 --- a/drivers/usb/host/Makefile +++ b/drivers/usb/host/Makefile @@ -49,6 +49,7 @@ 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_S3CXXXX) += ohci-s3c2410.o

CONFIG_USB_OHCI_HCD_S3C2410

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 b48c892..b69a49e 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 e125770..48b5948 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 S3CXXXX driver"

OHCI S3C2410 driver

+static const char hcd_name[] = "ohci-s3cxxxx";

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;

@@ -373,8 +390,6 @@ 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;

@@ -391,71 +406,7 @@ 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) { @@ -532,4 +483,39 @@ static struct platform_driver ohci_hcd_s3c2410_driver = { }, };

+static int __init ohci_s3cxxxx_init(void)

ohci_s3c2410_init

+{

• 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_s3cxxxx_init);

+static void __exit ohci_s3cxxxx_cleanup(void)

ohci_s3c2410_cleanup

+{

• platform_driver_unregister(&ohci_hcd_s3c2410_driver);

+} +module_exit(ohci_s3cxxxx_cleanup);

+MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:s3c2410-ohci");

Best regards, Tomasz