[PATCH 6/6] USB: OHCI: make ohci-s3c2410 a separate driver
Manjunath Goudar
manjunath.goudar at linaro.org
Mon Jul 22 05:19:30 EDT 2013
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 at linaro.org>
Acked-by: Alan Stern <stern at rowland.harvard.edu>
Cc: Arnd Bergmann <arnd at arndb.de>
Cc: Greg KH <greg at kroah.com>
Cc: linux-usb at 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"
+ depends on USB_OHCI_HCD && (ARCH_S3C24XX || ARCH_S3C64XX)
+ default y
+ ---help---
+ Enables support for the on-chip OHCI controller on
+ S3CXXXX 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 a70b044..9dffe81 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -51,6 +51,7 @@ 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-$(CONFIG_USB_OHCI_HCD_S3CXXXX) += ohci-s3c2410.o
obj-$(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"
+
+static const char hcd_name[] = "ohci-s3cxxxx";
+
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)
+{
+ 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)
+{
+ platform_driver_unregister(&ohci_hcd_s3c2410_driver);
+}
+module_exit(ohci_s3cxxxx_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c2410-ohci");
--
1.7.9.5
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