USB: EHCI: make ehci-atmel a separate driver

Separate the Atmel 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 Atmel can be
booted with a multi-platform kernel. This is currently planned for
Linux-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 Atmel bus glue.

In V4 (arnd):
 - reordered #include statements.
 - removed call to ehci_shutdown and the corresponding export

In V3:
 - Detailed commit message added here about why this patch is required.
 - Replaced hcd_name string "ehci-atmel" to "atmel-ehci".
 - Inserted blank line in the Makefile to separate the EHCI drivers from
   the following non-EHCI drivers.
 - Exported ehci_shutdown symbol as it is needed by the Atmel driver.
 - Eliminated ehci_atmel_setup routine because hcd registers
   can be directly set in the ehci_atmel_drv_probe function.

In V2:
  Resolved below compiler error.
  drivers/usb/host/ehci-atmel.c: In function 'ehci_atmel_drv_remove':
  drivers/usb/host/ehci-atmel.c:167: error: implicit declaration of function 'ehci_shutdown'

Signed-off-by: Manjunath Goudar <manjunath.goudar@linaro.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Andrew Victor <linux@maxim.org.za>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 51 insertions, 52 deletions

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 5d4f42afb4b5..c7a6866115c7 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -182,6 +182,14 @@ config USB_EHCI_HCD_SPEAR
           Enables support for the on-chip EHCI controller on
           ST SPEAr chips.
 
+config USB_EHCI_HCD_AT91
+        tristate  "Support for Atmel on-chip EHCI USB controller"
+        depends on USB_EHCI_HCD && ARCH_AT91
+        default y
+        ---help---
+          Enables support for the on-chip EHCI controller on
+          Atmel chips.
+
 config USB_EHCI_MSM
         bool "Support for MSM on-chip EHCI USB controller"
         depends on USB_EHCI_HCD && ARCH_MSM
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 3d895b5adc32..368d3eb994d3 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_USB_EHCI_HCD_OMAP)	+= ehci-omap.o
 obj-$(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-$(CONFIG_USB_OXU210HP_HCD)  += oxu210hp-hcd.o
 obj-$(CONFIG_USB_ISP116X_HCD)   += isp116x-hcd.o
diff --git a/drivers/usb/host/ehci-atmel.c b/drivers/usb/host/ehci-atmel.c
index f3beac4d06b8..66420097c242 100644
--- a/drivers/usb/host/ehci-atmel.c
+++ b/drivers/usb/host/ehci-atmel.c
@@ -12,9 +12,22 @@
  */
 
 #include <linux/clk.h>
-#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ehci.h"
+
+#define DRIVER_DESC "EHCI Atmel driver"
+
+static const char hcd_name[] = "ehci-atmel";
+static struct hc_driver __read_mostly ehci_atmel_hc_driver;
 
 /* interface and function clocks */
 static struct clk *iclk, *fclk;
@@ -50,51 +63,6 @@ static void atmel_stop_ehci(struct platform_device *pdev)
 
 /*-------------------------------------------------------------------------*/
 
-static int ehci_atmel_setup(struct usb_hcd *hcd)
-{
-        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
-
-        /* registers start at offset 0x0 */
-        ehci->caps = hcd->regs;
-
-        return ehci_setup(hcd);
-}
-
-static const struct hc_driver ehci_atmel_hc_driver = {
-        .description            = hcd_name,
-        .product_desc           = "Atmel EHCI UHP HS",
-        .hcd_priv_size          = sizeof(struct ehci_hcd),
-
-        /* generic hardware linkage */
-        .irq                    = ehci_irq,
-        .flags                  = HCD_MEMORY | HCD_USB2,
-
-        /* basic lifecycle operations */
-        .reset                  = ehci_atmel_setup,
-        .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,
-
-        /* scheduling support */
-        .get_frame_number       = ehci_get_frame,
-
-        /* root hub support */
-        .hub_status_data        = ehci_hub_status_data,
-        .hub_control            = ehci_hub_control,
-        .bus_suspend            = ehci_bus_suspend,
-        .bus_resume             = ehci_bus_resume,
-        .relinquish_port        = ehci_relinquish_port,
-        .port_handed_over       = ehci_port_handed_over,
-
-        .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
-};
-
 static u64 at91_ehci_dma_mask = DMA_BIT_MASK(32);
 
 static int ehci_atmel_drv_probe(struct platform_device *pdev)
@@ -102,6 +70,7 @@ static int ehci_atmel_drv_probe(struct platform_device *pdev)
         struct usb_hcd *hcd;
         const struct hc_driver *driver = &ehci_atmel_hc_driver;
         struct resource *res;
+        struct ehci_hcd *ehci;
         int irq;
         int retval;
 
@@ -162,6 +131,10 @@ static int ehci_atmel_drv_probe(struct platform_device *pdev)
                 goto fail_request_resource;
         }
 
+        ehci = hcd_to_ehci(hcd);
+        /* registers start at offset 0x0 */
+        ehci->caps = hcd->regs;
+
         atmel_start_ehci(pdev);
 
         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
@@ -185,7 +158,6 @@ static int ehci_atmel_drv_remove(struct platform_device *pdev)
 {
         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 
-        ehci_shutdown(hcd);
         usb_remove_hcd(hcd);
         usb_put_hcd(hcd);
 
@@ -213,3 +185,25 @@ static struct platform_driver ehci_atmel_driver = {
                 .of_match_table = of_match_ptr(atmel_ehci_dt_ids),
         },
 };
+
+static int __init ehci_atmel_init(void)
+{
+        if (usb_disabled())
+                return -ENODEV;
+
+        pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+        ehci_init_driver(&ehci_atmel_hc_driver, NULL);
+        return platform_driver_register(&ehci_atmel_driver);
+}
+module_init(ehci_atmel_init);
+
+static void __exit ehci_atmel_cleanup(void)
+{
+        platform_driver_unregister(&ehci_atmel_driver);
+}
+module_exit(ehci_atmel_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS("platform:atmel-ehci");
+MODULE_AUTHOR("Nicolas Ferre");
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 8f1f4b489a68..ccc78abd4500 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1254,11 +1254,6 @@ MODULE_LICENSE ("GPL");
 #define PLATFORM_DRIVER         ehci_hcd_w90x900_driver
 #endif
 
-#ifdef CONFIG_ARCH_AT91
-#include "ehci-atmel.c"
-#define PLATFORM_DRIVER         ehci_atmel_driver
-#endif
-
 #ifdef CONFIG_USB_OCTEON_EHCI
 #include "ehci-octeon.c"
 #define PLATFORM_DRIVER         ehci_octeon_driver
@@ -1307,6 +1302,7 @@ MODULE_LICENSE ("GPL");
         !IS_ENABLED(CONFIG_USB_EHCI_HCD_ORION) && \
         !IS_ENABLED(CONFIG_USB_EHCI_HCD_SPEAR) && \
         !IS_ENABLED(CONFIG_USB_EHCI_S5P) && \
+        !IS_ENABLED(CONFIG_USB_EHCI_HCD_AT91) && \
         !defined(PLATFORM_DRIVER) && \
         !defined(PS3_SYSTEM_BUS_DRIVER) && \
         !defined(OF_PLATFORM_DRIVER) && \