USB: EHCI: make ehci-msm a separate driver

Separate the  Qualcomm QSD/MSM on-chip host controller driver from
ehci-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;
however, note that other changes are still needed before Qualcomm QSD/MSM
can be booted with a multi-platform kernel, which is not expected before
3.11.

With the infrastructure added by Alan Stern in patch 3e0232039
"USB: EHCI: prepare to make ehci-hcd a library module", we can
avoid this problem by turning a bus glue into a separate
module, as we do here for the msm bus glue.

In V5 (arnd):
 - add FIXME about missing usb_add_hcd() or usb_remove_hcd() calls

In V3:
 - Detailed commit message added here describing why this patch is required.
 - Arranged  #include's in alphabetical order.
 - driver.name initialized hcd_name[] = "ehci-msm" in platform_driver
   structure initialization instead of "msm-ehci", which was the reason
   why it broke in EHCI USB testing

In V2:
Tegra patch related changes removed from this patch.

Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 44 insertions, 54 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index c7a6866115c7..dbeac41595de 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -191,7 +191,7 @@ config USB_EHCI_HCD_AT91
           Atmel chips.
 
 config USB_EHCI_MSM
-        bool "Support for MSM on-chip EHCI USB controller"
+        tristate "Support for Qualcomm QSD/MSM on-chip EHCI USB controller"
         depends on USB_EHCI_HCD && ARCH_MSM
         select USB_EHCI_ROOT_HUB_TT
         select USB_MSM_OTG
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 368d3eb994d3..4fb73c156d72 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_USB_EHCI_HCD_ORION)	+= ehci-orion.o
 obj-$(CONFIG_USB_EHCI_HCD_SPEAR)        += ehci-spear.o
 obj-$(CONFIG_USB_EHCI_S5P)      += ehci-s5p.o
 obj-$(CONFIG_USB_EHCI_HCD_AT91) += ehci-atmel.o
+obj-$(CONFIG_USB_EHCI_MSM)      += ehci-msm.o
 
 obj-$(CONFIG_USB_OXU210HP_HCD)  += oxu210hp-hcd.o
 obj-$(CONFIG_USB_ISP116X_HCD)   += isp116x-hcd.o
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index ccc78abd4500..2e0c2bd6495f 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1259,11 +1259,6 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER         ehci_octeon_driver
 #endif
 
-#ifdef CONFIG_USB_EHCI_MSM
-#include "ehci-msm.c"
-#define PLATFORM_DRIVER         ehci_msm_driver
-#endif
-
 #ifdef CONFIG_TILE_USB
 #include "ehci-tilegx.c"
 #define PLATFORM_DRIVER         ehci_hcd_tilegx_driver
@@ -1303,6 +1298,7 @@ MODULE_LICENSE ("GPL");
         !IS_ENABLED(CONFIG_USB_EHCI_HCD_SPEAR) && \
         !IS_ENABLED(CONFIG_USB_EHCI_S5P) && \
         !IS_ENABLED(CONFIG_USB_EHCI_HCD_AT91) && \
+        !IS_ENABLED(CONFIG_USB_EHCI_MSM) && \
         !defined(PLATFORM_DRIVER) && \
         !defined(PS3_SYSTEM_BUS_DRIVER) && \
         !defined(OF_PLATFORM_DRIVER) && \
diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
index ebf410311957..0f717dc688b7 100644
--- a/drivers/usb/host/ehci-msm.c
+++ b/drivers/usb/host/ehci-msm.c
@@ -22,16 +22,26 @@
  * along with this program; if not, you can find it at http://www.fsf.org
  */
 
-#include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
-
 #include <linux/usb/otg.h>
 #include <linux/usb/msm_hsusb_hw.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ehci.h"
 
 #define MSM_USB_BASE (hcd->regs)
 
+#define DRIVER_DESC "Qualcomm On-Chip EHCI Host Controller"
+
+static const char hcd_name[] = "ehci-msm";
+static struct hc_driver __read_mostly msm_hc_driver;
 static struct usb_phy *phy;
 
 static int ehci_msm_reset(struct usb_hcd *hcd)
@@ -56,52 +66,6 @@ static int ehci_msm_reset(struct usb_hcd *hcd)
         return 0;
 }
 
-static struct hc_driver msm_hc_driver = {
-        .description            = hcd_name,
-        .product_desc           = "Qualcomm On-Chip EHCI Host Controller",
-        .hcd_priv_size          = sizeof(struct ehci_hcd),
-
-        /*
-         * generic hardware linkage
-         */
-        .irq                    = ehci_irq,
-        .flags                  = HCD_USB2 | HCD_MEMORY,
-
-        .reset                  = ehci_msm_reset,
-        .start                  = ehci_run,
-
-        .stop                   = ehci_stop,
-        .shutdown               = ehci_shutdown,
-
-        /*
-         * managing i/o requests and associated device resources
-         */
-        .urb_enqueue            = ehci_urb_enqueue,
-        .urb_dequeue            = ehci_urb_dequeue,
-        .endpoint_disable       = ehci_endpoint_disable,
-        .endpoint_reset         = ehci_endpoint_reset,
-        .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
-
-        /*
-         * scheduling support
-         */
-        .get_frame_number       = ehci_get_frame,
-
-        /*
-         * root hub support
-         */
-        .hub_status_data        = ehci_hub_status_data,
-        .hub_control            = ehci_hub_control,
-        .relinquish_port        = ehci_relinquish_port,
-        .port_handed_over       = ehci_port_handed_over,
-
-        /*
-         * PM support
-         */
-        .bus_suspend            = ehci_bus_suspend,
-        .bus_resume             = ehci_bus_resume,
-};
-
 static int ehci_msm_probe(struct platform_device *pdev)
 {
         struct usb_hcd *hcd;
@@ -165,6 +129,8 @@ static int ehci_msm_probe(struct platform_device *pdev)
         pm_runtime_no_callbacks(&pdev->dev);
         pm_runtime_enable(&pdev->dev);
 
+        /* FIXME: need to call usb_add_hcd() here? */
+
         return 0;
 
 put_hcd:
@@ -183,6 +149,8 @@ static int ehci_msm_remove(struct platform_device *pdev)
 
         otg_set_host(phy->otg, NULL);
 
+        /* FIXME: need to call usb_remove_hcd() here? */
+
         usb_put_hcd(hcd);
 
         return 0;
@@ -226,3 +194,28 @@ static struct platform_driver ehci_msm_driver = {
                    .pm = &ehci_msm_dev_pm_ops,
         },
 };
+
+static const struct ehci_driver_overrides msm_overrides __initdata = {
+        .reset = ehci_msm_reset,
+};
+
+static int __init ehci_msm_init(void)
+{
+        if (usb_disabled())
+                return -ENODEV;
+
+        pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+        ehci_init_driver(&msm_hc_driver, &msm_overrides);
+        return platform_driver_register(&ehci_msm_driver);
+}
+module_init(ehci_msm_init);
+
+static void __exit ehci_msm_cleanup(void)
+{
+        platform_driver_unregister(&ehci_msm_driver);
+}
+module_exit(ehci_msm_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS("platform:msm-ehci");
+MODULE_LICENSE("GPL");