USB: OHCI: make ohci-omap a separate driver

Separate the  TI OHCI OMAP1/2 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: Felipe Balbi <balbi@ti.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 55 insertions, 122 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index d8d39c7846c7..2b11084c3be9 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -367,7 +367,7 @@ config USB_OHCI_HCD
 if USB_OHCI_HCD
 
 config USB_OHCI_HCD_OMAP1
-        bool "OHCI support for OMAP1/2 chips"
+        tristate "OHCI support for OMAP1/2 chips"
         depends on ARCH_OMAP1
         default y
         ---help---
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 78ace5517896..b1640efad539 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_USB_OHCI_HCD)	+= ohci-hcd.o
 obj-$(CONFIG_USB_OHCI_HCD_PCI)  += ohci-pci.o
 obj-$(CONFIG_USB_OHCI_HCD_PLATFORM)     += ohci-platform.o
 obj-$(CONFIG_USB_OHCI_EXYNOS)   += ohci-exynos.o
+obj-$(CONFIG_USB_OHCI_HCD_OMAP1)        += ohci-omap.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 1fc7d3bb78b2..fcef838f3c33 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -1182,11 +1182,6 @@ MODULE_LICENSE ("GPL");
 #define S3C2410_PLATFORM_DRIVER ohci_hcd_s3c2410_driver
 #endif
 
-#ifdef CONFIG_USB_OHCI_HCD_OMAP1
-#include "ohci-omap.c"
-#define OMAP1_PLATFORM_DRIVER   ohci_hcd_omap_driver
-#endif
-
 #ifdef CONFIG_USB_OHCI_HCD_OMAP3
 #include "ohci-omap3.c"
 #define OMAP3_PLATFORM_DRIVER   ohci_hcd_omap3_driver
@@ -1289,12 +1284,6 @@ static int __init ohci_hcd_mod_init(void)
                 goto error_platform;
 #endif
 
-#ifdef OMAP1_PLATFORM_DRIVER
-        retval = platform_driver_register(&OMAP1_PLATFORM_DRIVER);
-        if (retval < 0)
-                goto error_omap1_platform;
-#endif
-
 #ifdef OMAP3_PLATFORM_DRIVER
         retval = platform_driver_register(&OMAP3_PLATFORM_DRIVER);
         if (retval < 0)
@@ -1408,10 +1397,6 @@ static int __init ohci_hcd_mod_init(void)
         platform_driver_unregister(&OMAP3_PLATFORM_DRIVER);
  error_omap3_platform:
 #endif
-#ifdef OMAP1_PLATFORM_DRIVER
-        platform_driver_unregister(&OMAP1_PLATFORM_DRIVER);
- error_omap1_platform:
-#endif
 #ifdef PLATFORM_DRIVER
         platform_driver_unregister(&PLATFORM_DRIVER);
  error_platform:
@@ -1466,9 +1451,6 @@ static void __exit ohci_hcd_mod_exit(void)
 #ifdef OMAP3_PLATFORM_DRIVER
         platform_driver_unregister(&OMAP3_PLATFORM_DRIVER);
 #endif
-#ifdef OMAP1_PLATFORM_DRIVER
-        platform_driver_unregister(&OMAP1_PLATFORM_DRIVER);
-#endif
 #ifdef PLATFORM_DRIVER
         platform_driver_unregister(&PLATFORM_DRIVER);
 #endif
diff --git a/drivers/usb/host/ohci-omap.c b/drivers/usb/host/ohci-omap.c
index 31d3a12eb486..18b27a27e7dc 100644
--- a/drivers/usb/host/ohci-omap.c
+++ b/drivers/usb/host/ohci-omap.c
@@ -14,12 +14,21 @@
  * This file is licenced under the GPL.
  */
 
-#include <linux/signal.h>
-#include <linux/jiffies.h>
-#include <linux/platform_device.h>
 #include <linux/clk.h>
+#include <linux/dma-mapping.h>
 #include <linux/err.h>
 #include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/usb/otg.h>
+#include <linux/platform_device.h>
+#include <linux/signal.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ohci.h"
 
 #include <asm/io.h>
 #include <asm/mach-types.h>
@@ -42,10 +51,7 @@
 #define OMAP1510_LB_MMU_RAM_H   0xfffec234
 #define OMAP1510_LB_MMU_RAM_L   0xfffec238
 
-
-#ifndef CONFIG_ARCH_OMAP
-#error "This file is OMAP bus glue.  CONFIG_OMAP must be defined."
-#endif
+#define DRIVER_DESC "OHCI OMAP driver"
 
 #ifdef CONFIG_TPS65010
 #include <linux/i2c/tps65010.h>
@@ -68,8 +74,9 @@ extern int ocpi_enable(void);
 
 static struct clk *usb_host_ck;
 static struct clk *usb_dc_ck;
-static int host_enabled;
-static int host_initialized;
+
+static const char hcd_name[] = "ohci-omap";
+static struct hc_driver __read_mostly ohci_omap_hc_driver;
 
 static void omap_ohci_clock_power(int on)
 {
@@ -188,7 +195,7 @@ static void start_hnp(struct ohci_hcd *ohci)
 
 /*-------------------------------------------------------------------------*/
 
-static int ohci_omap_init(struct usb_hcd *hcd)
+static int ohci_omap_reset(struct usb_hcd *hcd)
 {
         struct ohci_hcd         *ohci = hcd_to_ohci(hcd);
         struct omap_usb_config  *config = dev_get_platdata(hcd->self.controller);
@@ -198,9 +205,9 @@ static int ohci_omap_init(struct usb_hcd *hcd)
         dev_dbg(hcd->self.controller, "starting USB Controller\n");
 
         if (config->otg) {
-                ohci_to_hcd(ohci)->self.otg_port = config->otg;
+                hcd->self.otg_port = config->otg;
                 /* default/minimum OTG power budget:  8 mA */
-                ohci_to_hcd(ohci)->power_budget = 8;
+                hcd->power_budget = 8;
         }
 
         /* boards can use OTG transceivers in non-OTG modes */
@@ -238,9 +245,15 @@ static int ohci_omap_init(struct usb_hcd *hcd)
                 omap_1510_local_bus_init();
         }
 
-        if ((ret = ohci_init(ohci)) < 0)
+        ret = ohci_setup(hcd);
+        if (ret < 0)
                 return ret;
 
+        if (config->otg || config->rwc) {
+                ohci->hc_control = OHCI_CTRL_RWC;
+                writel(OHCI_CTRL_RWC, &ohci->regs->control);
+        }
+
         /* board-specific power switching and overcurrent support */
         if (machine_is_omap_osk() || machine_is_omap_innovator()) {
                 u32     rh = roothub_a (ohci);
@@ -281,14 +294,6 @@ static int ohci_omap_init(struct usb_hcd *hcd)
         return 0;
 }
 
-static void ohci_omap_stop(struct usb_hcd *hcd)
-{
-        dev_dbg(hcd->self.controller, "stopping USB Controller\n");
-        ohci_stop(hcd);
-        omap_ohci_clock_power(0);
-}
-
-
 /*-------------------------------------------------------------------------*/
 
 /**
@@ -304,7 +309,6 @@ static int usb_hcd_omap_probe (const struct hc_driver *driver,
 {
         int retval, irq;
         struct usb_hcd *hcd = 0;
-        struct ohci_hcd *ohci;
 
         if (pdev->num_resources != 2) {
                 printk(KERN_ERR "hcd probe: invalid num_resources: %i\n",
@@ -354,12 +358,6 @@ static int usb_hcd_omap_probe (const struct hc_driver *driver,
                 goto err2;
         }
 
-        ohci = hcd_to_ohci(hcd);
-        ohci_hcd_init(ohci);
-
-        host_initialized = 0;
-        host_enabled = 1;
-
         irq = platform_get_irq(pdev, 0);
         if (irq < 0) {
                 retval = -ENXIO;
@@ -369,11 +367,6 @@ static int usb_hcd_omap_probe (const struct hc_driver *driver,
         if (retval)
                 goto err3;
 
-        host_initialized = 1;
-
-        if (!host_enabled)
-                omap_ohci_clock_power(0);
-
         return 0;
 err3:
         iounmap(hcd->regs);
@@ -402,7 +395,9 @@ err0:
 static inline void
 usb_hcd_omap_remove (struct usb_hcd *hcd, struct platform_device *pdev)
 {
+        dev_dbg(hcd->self.controller, "stopping USB Controller\n");
         usb_remove_hcd(hcd);
+        omap_ohci_clock_power(0);
         if (!IS_ERR_OR_NULL(hcd->phy)) {
                 (void) otg_set_host(hcd->phy->otg, 0);
                 usb_put_phy(hcd->phy);
@@ -418,76 +413,6 @@ usb_hcd_omap_remove (struct usb_hcd *hcd, struct platform_device *pdev)
 
 /*-------------------------------------------------------------------------*/
 
-static int
-ohci_omap_start (struct usb_hcd *hcd)
-{
-        struct omap_usb_config *config;
-        struct ohci_hcd *ohci = hcd_to_ohci (hcd);
-        int             ret;
-
-        if (!host_enabled)
-                return 0;
-        config = dev_get_platdata(hcd->self.controller);
-        if (config->otg || config->rwc) {
-                ohci->hc_control = OHCI_CTRL_RWC;
-                writel(OHCI_CTRL_RWC, &ohci->regs->control);
-        }
-
-        if ((ret = ohci_run (ohci)) < 0) {
-                dev_err(hcd->self.controller, "can't start\n");
-                ohci_stop (hcd);
-                return ret;
-        }
-        return 0;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static const struct hc_driver ohci_omap_hc_driver = {
-        .description =          hcd_name,
-        .product_desc =         "OMAP OHCI",
-        .hcd_priv_size =        sizeof(struct ohci_hcd),
-
-        /*
-         * generic hardware linkage
-         */
-        .irq =                  ohci_irq,
-        .flags =                HCD_USB11 | HCD_MEMORY,
-
-        /*
-         * basic lifecycle operations
-         */
-        .reset =                ohci_omap_init,
-        .start =                ohci_omap_start,
-        .stop =                 ohci_omap_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_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 int ohci_hcd_omap_drv_probe(struct platform_device *dev)
 {
         return usb_hcd_omap_probe(&ohci_omap_hc_driver, dev);
@@ -553,4 +478,29 @@ static struct platform_driver ohci_hcd_omap_driver = {
         },
 };
 
+static const struct ohci_driver_overrides omap_overrides __initconst = {
+        .product_desc   = "OMAP OHCI",
+        .reset          = ohci_omap_reset
+};
+
+static int __init ohci_omap_init(void)
+{
+        if (usb_disabled())
+                return -ENODEV;
+
+        pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+
+        ohci_init_driver(&ohci_omap_hc_driver, &omap_overrides);
+        return platform_driver_register(&ohci_hcd_omap_driver);
+}
+module_init(ohci_omap_init);
+
+static void __exit ohci_omap_cleanup(void)
+{
+        platform_driver_unregister(&ohci_hcd_omap_driver);
+}
+module_exit(ohci_omap_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_ALIAS("platform:ohci");
+MODULE_LICENSE("GPL");