[PATCH v2 0/4] Allow xHCI drivers to be built as separate modules

[PATCH v2 0/4] Allow xHCI drivers to be built as separate modules

[Andrew Bresticker]

It was suggested in the review of the Tegra xHCI driver [1] that we
allow xHCI drivers to be built as individual modules (like EHCI) instead
of building them all into the single xhci-hcd module as they are today.

Patches 1-3 prepare for making the xHCI PCI and platform drivers able
to be built as individual modules and patch 4 actually creates the 3
separate modules (core, platform, PCI).

Based on 3.17-rc1.

Changes from v1:
 - rebased on changes introduced by xhci-rcar driver

[1] http://patchwork.ozlabs.org/patch/361265/

Andrew Bresticker (4):
  xhci: Introduce xhci_init_driver()
  xhci: Check for XHCI_COMP_MODE_QUIRK when disabling D3cold
  xhci: Export symbols used by host-controller drivers
  xhci: Allow xHCI drivers to be built as separate modules

 drivers/usb/host/Kconfig     |  5 +++
 drivers/usb/host/Makefile    | 12 +++---
 drivers/usb/host/xhci-dbg.c  |  1 +
 drivers/usb/host/xhci-pci.c  | 80 +++++++-----------------------------
 drivers/usb/host/xhci-plat.c | 68 ++++++-------------------------
 drivers/usb/host/xhci.c      | 97 +++++++++++++++++++++++++++++++++-----------
 drivers/usb/host/xhci.h      | 23 +----------
 7 files changed, 114 insertions(+), 172 deletions(-)

-- 
2.1.0.rc2.206.gedb03e5

[PATCH v2 1/4] xhci: Introduce xhci_init_driver()

[Andrew Bresticker]

Since the struct hc_driver is mostly the same across the xhci-pci,
xhci-plat, and the upcoming xhci-tegra driver, introduce the function
xhci_init_driver() which will populate the hc_driver with the default
xHCI operations.  The caller must supply a setup function which will
be used as the hc_driver's reset callback.

Note that xhci-plat also overrides the default ->start() callback so
that it can do rcar-specific initialization.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
---
Changes from v1:
 - rebased on changes introduced by xhci-rcar driver
---
 drivers/usb/host/xhci-pci.c  | 69 +++++---------------------------------------
 drivers/usb/host/xhci-plat.c | 59 ++++---------------------------------
 drivers/usb/host/xhci.c      | 69 ++++++++++++++++++++++++++++++++++++++++++++
 drivers/usb/host/xhci.h      |  1 +
 4 files changed, 82 insertions(+), 116 deletions(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 687d366..88d4553 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -40,6 +40,8 @@
 
 static const char hcd_name[] = "xhci_hcd";
 
+static struct hc_driver __read_mostly xhci_pci_hc_driver;
+
 /* called after powerup, by probe or system-pm "wakeup" */
 static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
 {
@@ -315,68 +317,6 @@ static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
 }
 #endif /* CONFIG_PM */
 
-static const struct hc_driver xhci_pci_hc_driver = {
-	.description =		hcd_name,
-	.product_desc =		"xHCI Host Controller",
-	.hcd_priv_size =	sizeof(struct xhci_hcd *),
-
-	/*
-	 * generic hardware linkage
-	 */
-	.irq =			xhci_irq,
-	.flags =		HCD_MEMORY | HCD_USB3 | HCD_SHARED,
-
-	/*
-	 * basic lifecycle operations
-	 */
-	.reset =		xhci_pci_setup,
-	.start =		xhci_run,
-#ifdef CONFIG_PM
-	.pci_suspend =          xhci_pci_suspend,
-	.pci_resume =           xhci_pci_resume,
-#endif
-	.stop =			xhci_stop,
-	.shutdown =		xhci_shutdown,
-
-	/*
-	 * managing i/o requests and associated device resources
-	 */
-	.urb_enqueue =		xhci_urb_enqueue,
-	.urb_dequeue =		xhci_urb_dequeue,
-	.alloc_dev =		xhci_alloc_dev,
-	.free_dev =		xhci_free_dev,
-	.alloc_streams =	xhci_alloc_streams,
-	.free_streams =		xhci_free_streams,
-	.add_endpoint =		xhci_add_endpoint,
-	.drop_endpoint =	xhci_drop_endpoint,
-	.endpoint_reset =	xhci_endpoint_reset,
-	.check_bandwidth =	xhci_check_bandwidth,
-	.reset_bandwidth =	xhci_reset_bandwidth,
-	.address_device =	xhci_address_device,
-	.enable_device =	xhci_enable_device,
-	.update_hub_device =	xhci_update_hub_device,
-	.reset_device =		xhci_discover_or_reset_device,
-
-	/*
-	 * scheduling support
-	 */
-	.get_frame_number =	xhci_get_frame,
-
-	/* Root hub support */
-	.hub_control =		xhci_hub_control,
-	.hub_status_data =	xhci_hub_status_data,
-	.bus_suspend =		xhci_bus_suspend,
-	.bus_resume =		xhci_bus_resume,
-	/*
-	 * call back when device connected and addressed
-	 */
-	.update_device =        xhci_update_device,
-	.set_usb2_hw_lpm =	xhci_set_usb2_hardware_lpm,
-	.enable_usb3_lpm_timeout =	xhci_enable_usb3_lpm_timeout,
-	.disable_usb3_lpm_timeout =	xhci_disable_usb3_lpm_timeout,
-	.find_raw_port_number =	xhci_find_raw_port_number,
-};
-
 /*-------------------------------------------------------------------------*/
 
 /* PCI driver selection metadata; PCI hotplugging uses this */
@@ -408,6 +348,11 @@ static struct pci_driver xhci_pci_driver = {
 
 int __init xhci_register_pci(void)
 {
+	xhci_init_driver(&xhci_pci_hc_driver, xhci_pci_setup);
+#ifdef CONFIG_PM
+	xhci_pci_hc_driver.pci_suspend = xhci_pci_suspend;
+	xhci_pci_hc_driver.pci_resume = xhci_pci_resume;
+#endif
 	return pci_register_driver(&xhci_pci_driver);
 }
 
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 1a0cf9f..14b22ba 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -23,6 +23,8 @@
 #include "xhci-mvebu.h"
 #include "xhci-rcar.h"
 
+static struct hc_driver __read_mostly xhci_plat_hc_driver;
+
 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
 {
 	/*
@@ -60,59 +62,6 @@ static int xhci_plat_start(struct usb_hcd *hcd)
 	return xhci_run(hcd);
 }
 
-static const struct hc_driver xhci_plat_xhci_driver = {
-	.description =		"xhci-hcd",
-	.product_desc =		"xHCI Host Controller",
-	.hcd_priv_size =	sizeof(struct xhci_hcd *),
-
-	/*
-	 * generic hardware linkage
-	 */
-	.irq =			xhci_irq,
-	.flags =		HCD_MEMORY | HCD_USB3 | HCD_SHARED,
-
-	/*
-	 * basic lifecycle operations
-	 */
-	.reset =		xhci_plat_setup,
-	.start =		xhci_plat_start,
-	.stop =			xhci_stop,
-	.shutdown =		xhci_shutdown,
-
-	/*
-	 * managing i/o requests and associated device resources
-	 */
-	.urb_enqueue =		xhci_urb_enqueue,
-	.urb_dequeue =		xhci_urb_dequeue,
-	.alloc_dev =		xhci_alloc_dev,
-	.free_dev =		xhci_free_dev,
-	.alloc_streams =	xhci_alloc_streams,
-	.free_streams =		xhci_free_streams,
-	.add_endpoint =		xhci_add_endpoint,
-	.drop_endpoint =	xhci_drop_endpoint,
-	.endpoint_reset =	xhci_endpoint_reset,
-	.check_bandwidth =	xhci_check_bandwidth,
-	.reset_bandwidth =	xhci_reset_bandwidth,
-	.address_device =	xhci_address_device,
-	.enable_device =	xhci_enable_device,
-	.update_hub_device =	xhci_update_hub_device,
-	.reset_device =		xhci_discover_or_reset_device,
-
-	/*
-	 * scheduling support
-	 */
-	.get_frame_number =	xhci_get_frame,
-
-	/* Root hub support */
-	.hub_control =		xhci_hub_control,
-	.hub_status_data =	xhci_hub_status_data,
-	.bus_suspend =		xhci_bus_suspend,
-	.bus_resume =		xhci_bus_resume,
-
-	.enable_usb3_lpm_timeout =	xhci_enable_usb3_lpm_timeout,
-	.disable_usb3_lpm_timeout =	xhci_disable_usb3_lpm_timeout,
-};
-
 static int xhci_plat_probe(struct platform_device *pdev)
 {
 	struct device_node	*node = pdev->dev.of_node;
@@ -128,7 +77,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
 	if (usb_disabled())
 		return -ENODEV;
 
-	driver = &xhci_plat_xhci_driver;
+	driver = &xhci_plat_hc_driver;
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
@@ -300,6 +249,8 @@ MODULE_ALIAS("platform:xhci-hcd");
 
 int xhci_register_plat(void)
 {
+	xhci_init_driver(&xhci_plat_hc_driver, xhci_plat_setup);
+	xhci_plat_hc_drver.start = xhci_plat_start;
 	return platform_driver_register(&usb_xhci_driver);
 }
 
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index b6f2117..f94530a 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4893,6 +4893,75 @@ error:
 	return retval;
 }
 
+static const struct hc_driver xhci_hc_driver = {
+	.description =		"xhci-hcd",
+	.product_desc =		"xHCI Host Controller",
+	.hcd_priv_size =	sizeof(struct xhci_hcd *),
+
+	/*
+	 * generic hardware linkage
+	 */
+	.irq =			xhci_irq,
+	.flags =		HCD_MEMORY | HCD_USB3 | HCD_SHARED,
+
+	/*
+	 * basic lifecycle operations
+	 */
+	.reset =		NULL, /* set in xhci_init_driver() */
+	.start =		xhci_run,
+	.stop =			xhci_stop,
+	.shutdown =		xhci_shutdown,
+
+	/*
+	 * managing i/o requests and associated device resources
+	 */
+	.urb_enqueue =		xhci_urb_enqueue,
+	.urb_dequeue =		xhci_urb_dequeue,
+	.alloc_dev =		xhci_alloc_dev,
+	.free_dev =		xhci_free_dev,
+	.alloc_streams =	xhci_alloc_streams,
+	.free_streams =		xhci_free_streams,
+	.add_endpoint =		xhci_add_endpoint,
+	.drop_endpoint =	xhci_drop_endpoint,
+	.endpoint_reset =	xhci_endpoint_reset,
+	.check_bandwidth =	xhci_check_bandwidth,
+	.reset_bandwidth =	xhci_reset_bandwidth,
+	.address_device =	xhci_address_device,
+	.enable_device =	xhci_enable_device,
+	.update_hub_device =	xhci_update_hub_device,
+	.reset_device =		xhci_discover_or_reset_device,
+
+	/*
+	 * scheduling support
+	 */
+	.get_frame_number =	xhci_get_frame,
+
+	/*
+	 * root hub support
+	 */
+	.hub_control =		xhci_hub_control,
+	.hub_status_data =	xhci_hub_status_data,
+	.bus_suspend =		xhci_bus_suspend,
+	.bus_resume =		xhci_bus_resume,
+
+	/*
+	 * call back when device connected and addressed
+	 */
+	.update_device =        xhci_update_device,
+	.set_usb2_hw_lpm =	xhci_set_usb2_hardware_lpm,
+	.enable_usb3_lpm_timeout =	xhci_enable_usb3_lpm_timeout,
+	.disable_usb3_lpm_timeout =	xhci_disable_usb3_lpm_timeout,
+	.find_raw_port_number =	xhci_find_raw_port_number,
+};
+
+void xhci_init_driver(struct hc_driver *drv, int (*setup_fn)(struct usb_hcd *))
+{
+	BUG_ON(!setup_fn);
+	*drv = xhci_hc_driver;
+	drv->reset = setup_fn;
+}
+EXPORT_SYMBOL_GPL(xhci_init_driver);
+
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_LICENSE("GPL");
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index dace515..194dbd3 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1762,6 +1762,7 @@ int xhci_run(struct usb_hcd *hcd);
 void xhci_stop(struct usb_hcd *hcd);
 void xhci_shutdown(struct usb_hcd *hcd);
 int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks);
+void xhci_init_driver(struct hc_driver *drv, int (*setup_fn)(struct usb_hcd *));
 
 #ifdef	CONFIG_PM
 int xhci_suspend(struct xhci_hcd *xhci);
-- 
2.1.0.rc2.206.gedb03e5

Re: [PATCH v2 1/4] xhci: Introduce xhci_init_driver()

[Yoshihiro Shimoda]

Hi,

(2014/08/19 1:12), Andrew Bresticker wrote:
> Since the struct hc_driver is mostly the same across the xhci-pci,
> xhci-plat, and the upcoming xhci-tegra driver, introduce the function
> xhci_init_driver() which will populate the hc_driver with the default
> xHCI operations.  The caller must supply a setup function which will
> be used as the hc_driver's reset callback.
> 
> Note that xhci-plat also overrides the default ->start() callback so
> that it can do rcar-specific initialization.
> 
> Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
> ---
> Changes from v1:
>  - rebased on changes introduced by xhci-rcar driver
< snip >
> @@ -300,6 +249,8 @@ MODULE_ALIAS("platform:xhci-hcd");
>  
>  int xhci_register_plat(void)
>  {
> +	xhci_init_driver(&xhci_plat_hc_driver, xhci_plat_setup);
> +	xhci_plat_hc_drver.start = xhci_plat_start;

Thank you for the care of xhci-rcar driver.
However, this "xhci_plat_hc_drver" should be "xhci_plat_hc_driver".

After I modified it by myself, I could build the xhci-plat-hcd.ko in my environment.

Best regards,
Yoshihiro Shimoda

Re: [PATCH v2 1/4] xhci: Introduce xhci_init_driver()

[Andrew Bresticker]

On Mon, Aug 18, 2014 at 11:10 PM, Yoshihiro Shimoda
<yoshihiro.shimoda.uh@renesas.com> wrote:
> Hi,
>
> (2014/08/19 1:12), Andrew Bresticker wrote:
>> Since the struct hc_driver is mostly the same across the xhci-pci,
>> xhci-plat, and the upcoming xhci-tegra driver, introduce the function
>> xhci_init_driver() which will populate the hc_driver with the default
>> xHCI operations.  The caller must supply a setup function which will
>> be used as the hc_driver's reset callback.
>>
>> Note that xhci-plat also overrides the default ->start() callback so
>> that it can do rcar-specific initialization.
>>
>> Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
>> ---
>> Changes from v1:
>>  - rebased on changes introduced by xhci-rcar driver
> < snip >
>> @@ -300,6 +249,8 @@ MODULE_ALIAS("platform:xhci-hcd");
>>
>>  int xhci_register_plat(void)
>>  {
>> +     xhci_init_driver(&xhci_plat_hc_driver, xhci_plat_setup);
>> +     xhci_plat_hc_drver.start = xhci_plat_start;
>
> Thank you for the care of xhci-rcar driver.
> However, this "xhci_plat_hc_drver" should be "xhci_plat_hc_driver".

D'oh!  Thanks for catching this... had it fixed in my tree but forgot
to update the patches.  v3 incoming.

[PATCH v2 2/4] xhci: Check for XHCI_COMP_MODE_QUIRK when disabling D3cold

[Andrew Bresticker]

Instead of calling xhci_compliance_mode_recovery_timer_quirk_check() again
in the PCI suspend path, just check for XHCI_COMP_MODE_QUIRK which will
have been set based on xhci_compliance_mode_recovery_timer_quirk_check()
in xhci_init().

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
---
No change from v1.
---
 drivers/usb/host/xhci-pci.c | 2 +-
 drivers/usb/host/xhci.c     | 2 +-
 drivers/usb/host/xhci.h     | 3 ---
 3 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 88d4553..8093ad6 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -279,7 +279,7 @@ static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
 	 * Systems with the TI redriver that loses port status change events
 	 * need to have the registers polled during D3, so avoid D3cold.
 	 */
-	if (xhci_compliance_mode_recovery_timer_quirk_check())
+	if (xhci->quirks & XHCI_COMP_MODE_QUIRK)
 		pdev->no_d3cold = true;
 
 	return xhci_suspend(xhci);
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index f94530a..a5cd831 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -491,7 +491,7 @@ static void compliance_mode_recovery_timer_init(struct xhci_hcd *xhci)
  * Systems:
  * Vendor: Hewlett-Packard -> System Models: Z420, Z620 and Z820
  */
-bool xhci_compliance_mode_recovery_timer_quirk_check(void)
+static bool xhci_compliance_mode_recovery_timer_quirk_check(void)
 {
 	const char *dmi_product_name, *dmi_sys_vendor;
 
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 194dbd3..71400b3 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1888,7 +1888,4 @@ struct xhci_input_control_ctx *xhci_get_input_control_ctx(struct xhci_hcd *xhci,
 struct xhci_slot_ctx *xhci_get_slot_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx);
 struct xhci_ep_ctx *xhci_get_ep_ctx(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx, unsigned int ep_index);
 
-/* xHCI quirks */
-bool xhci_compliance_mode_recovery_timer_quirk_check(void);
-
 #endif /* __LINUX_XHCI_HCD_H */
-- 
2.1.0.rc2.206.gedb03e5

[PATCH v2 3/4] xhci: Export symbols used by host-controller drivers

[Andrew Bresticker]

In preparation for allowing the xHCI host controller drivers to be built
as separate modules, export symbols from the xHCI core that may be used
by the host controller drivers.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
---
Changes from v1:
 - exported xhci_run()
---
 drivers/usb/host/xhci-dbg.c | 1 +
 drivers/usb/host/xhci.c     | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/usb/host/xhci-dbg.c b/drivers/usb/host/xhci-dbg.c
index eb009a4..bb89175 100644
--- a/drivers/usb/host/xhci-dbg.c
+++ b/drivers/usb/host/xhci-dbg.c
@@ -594,3 +594,4 @@ void xhci_dbg_trace(struct xhci_hcd *xhci, void (*trace)(struct va_format *),
 	trace(&vaf);
 	va_end(args);
 }
+EXPORT_SYMBOL_GPL(xhci_dbg_trace);
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index a5cd831..edfc96f 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -653,6 +653,7 @@ int xhci_run(struct usb_hcd *hcd)
 			"Finished xhci_run for USB2 roothub");
 	return 0;
 }
+EXPORT_SYMBOL_GPL(xhci_run);
 
 static void xhci_only_stop_hcd(struct usb_hcd *hcd)
 {
@@ -927,6 +928,7 @@ int xhci_suspend(struct xhci_hcd *xhci)
 
 	return rc;
 }
+EXPORT_SYMBOL_GPL(xhci_suspend);
 
 /*
  * start xHC (not bus-specific)
@@ -1078,6 +1080,7 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
 
 	return retval;
 }
+EXPORT_SYMBOL_GPL(xhci_resume);
 #endif	/* CONFIG_PM */
 
 /*-------------------------------------------------------------------------*/
@@ -4892,6 +4895,7 @@ error:
 	kfree(xhci);
 	return retval;
 }
+EXPORT_SYMBOL_GPL(xhci_gen_setup);
 
 static const struct hc_driver xhci_hc_driver = {
 	.description =		"xhci-hcd",
-- 
2.1.0.rc2.206.gedb03e5

[PATCH v2 4/4] xhci: Allow xHCI drivers to be built as separate modules

[Andrew Bresticker]

Instead of building all of the xHCI code into a single module, separate
it out into the core (xhci-hcd), PCI (xhci-pci, now selected by the new
config option CONFIG_USB_XHCI_PCI), and platform (xhci-plat) drivers.
Also update the PCI/platform drivers with module descriptions/licenses
and have them register their respective drivers in their initcalls.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
---
Changes from v1:
 - rebased on changes introduced by xhci-rcar driver
---
 drivers/usb/host/Kconfig     |  5 +++++
 drivers/usb/host/Makefile    | 12 ++++++------
 drivers/usb/host/xhci-pci.c  |  9 +++++++--
 drivers/usb/host/xhci-plat.c |  9 +++++++--
 drivers/usb/host/xhci.c      | 22 ----------------------
 drivers/usb/host/xhci.h      | 19 -------------------
 6 files changed, 25 insertions(+), 51 deletions(-)

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 82800a7..f5a5831 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -26,6 +26,11 @@ config USB_XHCI_HCD
 
 if USB_XHCI_HCD
 
+config USB_XHCI_PCI
+       tristate
+       depends on PCI
+       default y
+
 config USB_XHCI_PLATFORM
 	tristate
 
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 144c038..702d9b7 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -15,22 +15,22 @@ fhci-$(CONFIG_FHCI_DEBUG) += fhci-dbg.o
 xhci-hcd-y := xhci.o xhci-mem.o
 xhci-hcd-y += xhci-ring.o xhci-hub.o xhci-dbg.o
 xhci-hcd-y += xhci-trace.o
-xhci-hcd-$(CONFIG_PCI)	+= xhci-pci.o
 
-ifneq ($(CONFIG_USB_XHCI_PLATFORM), )
-	xhci-hcd-y		+= xhci-plat.o
+xhci-plat-hcd-y := xhci-plat.o
 ifneq ($(CONFIG_USB_XHCI_MVEBU), )
-	xhci-hcd-y		+= xhci-mvebu.o
+	xhci-plat-hcd-y		+= xhci-mvebu.o
 endif
 ifneq ($(CONFIG_USB_XHCI_RCAR), )
-	xhci-hcd-y		+= xhci-rcar.o
-endif
+	xhci-plat-hcd-y		+= xhci-rcar.o
 endif
 
 obj-$(CONFIG_USB_WHCI_HCD)	+= whci/
 
 obj-$(CONFIG_PCI)		+= pci-quirks.o
 
+obj-$(CONFIG_USB_XHCI_PCI)	+= xhci-pci.o
+obj-$(CONFIG_USB_XHCI_PLATFORM) += xhci-plat-hcd.o
+
 obj-$(CONFIG_USB_EHCI_HCD)	+= ehci-hcd.o
 obj-$(CONFIG_USB_EHCI_PCI)	+= ehci-pci.o
 obj-$(CONFIG_USB_EHCI_HCD_PLATFORM)	+= ehci-platform.o
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 8093ad6..f97d27c 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -346,7 +346,7 @@ static struct pci_driver xhci_pci_driver = {
 #endif
 };
 
-int __init xhci_register_pci(void)
+static int __init xhci_pci_init(void)
 {
 	xhci_init_driver(&xhci_pci_hc_driver, xhci_pci_setup);
 #ifdef CONFIG_PM
@@ -355,8 +355,13 @@ int __init xhci_register_pci(void)
 #endif
 	return pci_register_driver(&xhci_pci_driver);
 }
+module_init(xhci_pci_init);
 
-void xhci_unregister_pci(void)
+static void __exit xhci_pci_exit(void)
 {
 	pci_unregister_driver(&xhci_pci_driver);
 }
+module_exit(xhci_pci_exit);
+
+MODULE_DESCRIPTION("xHCI PCI Host Controller Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 14b22ba..e5e90c7 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -247,14 +247,19 @@ static struct platform_driver usb_xhci_driver = {
 };
 MODULE_ALIAS("platform:xhci-hcd");
 
-int xhci_register_plat(void)
+static int __init xhci_plat_init(void)
 {
 	xhci_init_driver(&xhci_plat_hc_driver, xhci_plat_setup);
 	xhci_plat_hc_drver.start = xhci_plat_start;
 	return platform_driver_register(&usb_xhci_driver);
 }
+module_init(xhci_plat_init);
 
-void xhci_unregister_plat(void)
+static void __exit xhci_plat_exit(void)
 {
 	platform_driver_unregister(&usb_xhci_driver);
 }
+module_exit(xhci_plat_exit);
+
+MODULE_DESCRIPTION("xHCI Platform Host Controller Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index edfc96f..a29cd7d 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4972,18 +4972,6 @@ MODULE_LICENSE("GPL");
 
 static int __init xhci_hcd_init(void)
 {
-	int retval;
-
-	retval = xhci_register_pci();
-	if (retval < 0) {
-		pr_debug("Problem registering PCI driver.\n");
-		return retval;
-	}
-	retval = xhci_register_plat();
-	if (retval < 0) {
-		pr_debug("Problem registering platform driver.\n");
-		goto unreg_pci;
-	}
 	/*
 	 * Check the compiler generated sizes of structures that must be laid
 	 * out in specific ways for hardware access.
@@ -5002,15 +4990,5 @@ static int __init xhci_hcd_init(void)
 	/* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */
 	BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);
 	return 0;
-unreg_pci:
-	xhci_unregister_pci();
-	return retval;
 }
 module_init(xhci_hcd_init);
-
-static void __exit xhci_hcd_cleanup(void)
-{
-	xhci_unregister_pci();
-	xhci_unregister_plat();
-}
-module_exit(xhci_hcd_cleanup);
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 71400b3..d9c9e0a 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1731,25 +1731,6 @@ void xhci_urb_free_priv(struct xhci_hcd *xhci, struct urb_priv *urb_priv);
 void xhci_free_command(struct xhci_hcd *xhci,
 		struct xhci_command *command);
 
-#ifdef CONFIG_PCI
-/* xHCI PCI glue */
-int xhci_register_pci(void);
-void xhci_unregister_pci(void);
-#else
-static inline int xhci_register_pci(void) { return 0; }
-static inline void xhci_unregister_pci(void) {}
-#endif
-
-#if IS_ENABLED(CONFIG_USB_XHCI_PLATFORM)
-int xhci_register_plat(void);
-void xhci_unregister_plat(void);
-#else
-static inline int xhci_register_plat(void)
-{ return 0; }
-static inline void xhci_unregister_plat(void)
-{  }
-#endif
-
 /* xHCI host controller glue */
 typedef void (*xhci_get_quirks_t)(struct device *, struct xhci_hcd *);
 int xhci_handshake(struct xhci_hcd *xhci, void __iomem *ptr,
-- 
2.1.0.rc2.206.gedb03e5