USB: OHCI: make ohci-spear a separate driver
Separate the ST OHCI SPEAr 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.
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: Viresh Kumar <viresh.linux@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/ohci-spear.c b/drivers/usb/host/ohci-spear.c
index cc9dd9e..31ff3fc 100644
--- a/drivers/usb/host/ohci-spear.c
+++ b/drivers/usb/host/ohci-spear.c
@@ -11,92 +11,37 @@
* warranty of any kind, whether express or implied.
*/
-#include <linux/signal.h>
-#include <linux/platform_device.h>
#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/signal.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include "ohci.h"
+
+#define DRIVER_DESC "OHCI SPEAr driver"
+
+static const char hcd_name[] = "SPEAr-ohci";
struct spear_ohci {
- struct ohci_hcd ohci;
struct clk *clk;
};
-#define to_spear_ohci(hcd) (struct spear_ohci *)hcd_to_ohci(hcd)
+#define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv)
-static void spear_start_ohci(struct spear_ohci *ohci)
-{
- clk_prepare_enable(ohci->clk);
-}
-
-static void spear_stop_ohci(struct spear_ohci *ohci)
-{
- clk_disable_unprepare(ohci->clk);
-}
-
-static int ohci_spear_start(struct usb_hcd *hcd)
-{
- struct ohci_hcd *ohci = hcd_to_ohci(hcd);
- int ret;
-
- ret = ohci_init(ohci);
- if (ret < 0)
- return ret;
- ohci->regs = hcd->regs;
-
- ret = ohci_run(ohci);
- if (ret < 0) {
- dev_err(hcd->self.controller, "can't start\n");
- ohci_stop(hcd);
- return ret;
- }
-
- create_debug_files(ohci);
-
-#ifdef DEBUG
- ohci_dump(ohci, 1);
-#endif
- return 0;
-}
-
-static const struct hc_driver ohci_spear_hc_driver = {
- .description = hcd_name,
- .product_desc = "SPEAr OHCI",
- .hcd_priv_size = sizeof(struct spear_ohci),
-
- /* generic hardware linkage */
- .irq = ohci_irq,
- .flags = HCD_USB11 | HCD_MEMORY,
-
- /* basic lifecycle operations */
- .start = ohci_spear_start,
- .stop = ohci_stop,
- .shutdown = ohci_shutdown,
-#ifdef CONFIG_PM
- .bus_suspend = ohci_bus_suspend,
- .bus_resume = ohci_bus_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,
-
- .start_port_reset = ohci_start_port_reset,
-};
+static struct hc_driver __read_mostly ohci_spear_hc_driver;
static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
{
const struct hc_driver *driver = &ohci_spear_hc_driver;
+ struct ohci_hcd *ohci;
struct usb_hcd *hcd = NULL;
struct clk *usbh_clk;
- struct spear_ohci *ohci_p;
+ struct spear_ohci *sohci_p;
struct resource *res;
int retval, irq;
@@ -151,16 +96,18 @@
goto err_put_hcd;
}
- ohci_p = (struct spear_ohci *)hcd_to_ohci(hcd);
- ohci_p->clk = usbh_clk;
- spear_start_ohci(ohci_p);
- ohci_hcd_init(hcd_to_ohci(hcd));
+ sohci_p = to_spear_ohci(hcd);
+ sohci_p->clk = usbh_clk;
+
+ clk_prepare_enable(sohci_p->clk);
+
+ ohci = hcd_to_ohci(hcd);
retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0);
if (retval == 0)
return retval;
- spear_stop_ohci(ohci_p);
+ clk_disable_unprepare(sohci_p->clk);
err_put_hcd:
usb_put_hcd(hcd);
fail:
@@ -172,11 +119,11 @@
static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
- struct spear_ohci *ohci_p = to_spear_ohci(hcd);
+ struct spear_ohci *sohci_p = to_spear_ohci(hcd);
usb_remove_hcd(hcd);
- if (ohci_p->clk)
- spear_stop_ohci(ohci_p);
+ if (sohci_p->clk)
+ clk_disable_unprepare(sohci_p->clk);
usb_put_hcd(hcd);
return 0;
@@ -188,13 +135,14 @@
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
- struct spear_ohci *ohci_p = to_spear_ohci(hcd);
+ struct spear_ohci *sohci_p = to_spear_ohci(hcd);
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
- spear_stop_ohci(ohci_p);
+ clk_disable_unprepare(sohci_p->clk);
+
return 0;
}
@@ -202,13 +150,13 @@
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
- struct spear_ohci *ohci_p = to_spear_ohci(hcd);
+ struct spear_ohci *sohci_p = to_spear_ohci(hcd);
if (time_before(jiffies, ohci->next_statechange))
msleep(5);
ohci->next_statechange = jiffies;
- spear_start_ohci(ohci_p);
+ clk_prepare_enable(sohci_p->clk);
ohci_resume(hcd, false);
return 0;
}
@@ -234,4 +182,28 @@
},
};
+static const struct ohci_driver_overrides spear_overrides __initconst = {
+ .extra_priv_size = sizeof(struct spear_ohci),
+};
+static int __init ohci_spear_init(void)
+{
+ if (usb_disabled())
+ return -ENODEV;
+
+ pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+
+ ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
+ return platform_driver_register(&spear_ohci_hcd_driver);
+}
+module_init(ohci_spear_init);
+
+static void __exit ohci_spear_cleanup(void)
+{
+ platform_driver_unregister(&spear_ohci_hcd_driver);
+}
+module_exit(ohci_spear_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Deepak Sikri");
+MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:spear-ohci");