Hi,
On Mon, Oct 01, 2012 at 04:21:37PM -0400, Alan Stern wrote:
> Felipe:
>
> This makes ehci-pci a separate module that depends on ehci-hcd. It's
> very straightforward; the only awkward thing is the way the driver
> entries have to be overridden by hand. I couldn't think of any better
> way of doing it. This is the penalty we pay for not using an
> object-oriented programming language. :-)
heh :-)
> Index: usb-3.6/drivers/usb/host/Kconfig
> ===================================================================
> --- usb-3.6.orig/drivers/usb/host/Kconfig
> +++ usb-3.6/drivers/usb/host/Kconfig
> @@ -95,6 +95,11 @@ config USB_EHCI_TT_NEWSCHED
>
> If unsure, say Y.
>
> +config USB_EHCI_PCI
> + tristate
> + depends on USB_EHCI_HCD && PCI
> + default y
> +
> config USB_EHCI_HCD_PMC_MSP
> tristate "EHCI support for on-chip PMC MSP71xx USB controller"
> depends on USB_EHCI_HCD && MSP_HAS_USB
> Index: usb-3.6/drivers/usb/host/Makefile
> ===================================================================
> --- usb-3.6.orig/drivers/usb/host/Makefile
> +++ usb-3.6/drivers/usb/host/Makefile
> @@ -24,6 +24,8 @@ obj-$(CONFIG_USB_WHCI_HCD) += whci/
> obj-$(CONFIG_PCI) += pci-quirks.o
>
> obj-$(CONFIG_USB_EHCI_HCD) += ehci-hcd.o
> +obj-$(CONFIG_USB_EHCI_PCI) += ehci-pci.o
> +
> obj-$(CONFIG_USB_OXU210HP_HCD) += oxu210hp-hcd.o
> obj-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o
> obj-$(CONFIG_USB_ISP1362_HCD) += isp1362-hcd.o
> Index: usb-3.6/drivers/usb/host/ehci-hcd.c
> ===================================================================
> --- usb-3.6.orig/drivers/usb/host/ehci-hcd.c
> +++ usb-3.6/drivers/usb/host/ehci-hcd.c
> @@ -1276,11 +1276,6 @@ MODULE_DESCRIPTION(DRIVER_DESC);
> MODULE_AUTHOR (DRIVER_AUTHOR);
> MODULE_LICENSE ("GPL");
>
> -#ifdef CONFIG_PCI
> -#include "ehci-pci.c"
> -#define PCI_DRIVER ehci_pci_driver
> -#endif
> -
> #ifdef CONFIG_USB_EHCI_FSL
> #include "ehci-fsl.c"
> #define PLATFORM_DRIVER ehci_fsl_driver
> @@ -1416,7 +1411,7 @@ MODULE_LICENSE ("GPL");
> #define PLATFORM_DRIVER ehci_platform_driver
> #endif
>
> -#if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
> +#if !defined(CONFIG_USB_EHCI_PCI) && !defined(PLATFORM_DRIVER) && \
> !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER) && \
> !defined(XILINX_OF_PLATFORM_DRIVER)
> #error "missing bus glue for ehci-hcd"
> @@ -1455,12 +1450,6 @@ static int __init ehci_hcd_init(void)
> goto clean0;
> #endif
>
> -#ifdef PCI_DRIVER
> - retval = pci_register_driver(&PCI_DRIVER);
> - if (retval < 0)
> - goto clean1;
> -#endif
> -
> #ifdef PS3_SYSTEM_BUS_DRIVER
> retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
> if (retval < 0)
> @@ -1492,10 +1481,6 @@ clean3:
> ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
> clean2:
> #endif
> -#ifdef PCI_DRIVER
> - pci_unregister_driver(&PCI_DRIVER);
> -clean1:
> -#endif
> #ifdef PLATFORM_DRIVER
> platform_driver_unregister(&PLATFORM_DRIVER);
> clean0:
> @@ -1521,9 +1506,6 @@ static void __exit ehci_hcd_cleanup(void
> #ifdef PLATFORM_DRIVER
> platform_driver_unregister(&PLATFORM_DRIVER);
> #endif
> -#ifdef PCI_DRIVER
> - pci_unregister_driver(&PCI_DRIVER);
> -#endif
> #ifdef PS3_SYSTEM_BUS_DRIVER
> ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
> #endif
> Index: usb-3.6/drivers/usb/host/ehci-pci.c
> ===================================================================
> --- usb-3.6.orig/drivers/usb/host/ehci-pci.c
> +++ usb-3.6/drivers/usb/host/ehci-pci.c
> @@ -18,9 +18,18 @@
> * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> */
>
> -#ifndef CONFIG_PCI
> -#error "This file is PCI bus glue. CONFIG_PCI must be defined."
> -#endif
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/pci.h>
> +#include <linux/usb.h>
> +#include <linux/usb/hcd.h>
> +
> +#include "ehci.h"
> +#include "pci-quirks.h"
> +
> +#define DRIVER_DESC "EHCI PCI platform driver"
> +
> +static const char hcd_name[] = "ehci-pci";
>
> /* defined here to avoid adding to pci_ids.h for single instance use */
> #define PCI_DEVICE_ID_INTEL_CE4100_USB 0x2e70
> @@ -377,7 +386,11 @@ static int ehci_pci_resume(struct usb_hc
> (void) ehci_pci_reinit(ehci, pdev);
> return 0;
> }
> -#endif
> +#else
> +
> +#define ehci_pci_suspend NULL
> +#define ehci_pci_resume NULL
> +#endif /* CONFIG_PM */
>
> static int ehci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
> {
> @@ -395,59 +408,7 @@ static int ehci_update_device(struct usb
> return rc;
> }
>
> -static const struct hc_driver ehci_pci_hc_driver = {
> - .description = hcd_name,
> - .product_desc = "EHCI Host Controller",
> - .hcd_priv_size = sizeof(struct ehci_hcd),
> -
> - /*
> - * generic hardware linkage
> - */
> - .irq = ehci_irq,
> - .flags = HCD_MEMORY | HCD_USB2,
> -
> - /*
> - * basic lifecycle operations
> - */
> - .reset = ehci_pci_setup,
> - .start = ehci_run,
> -#ifdef CONFIG_PM
> - .pci_suspend = ehci_pci_suspend,
> - .pci_resume = ehci_pci_resume,
> -#endif
> - .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,
> -
> - /*
> - * call back when device connected and addressed
> - */
> - .update_device = ehci_update_device,
> -
> - .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
> -};
> +static struct hc_driver ehci_pci_hc_driver;
>
> /*-------------------------------------------------------------------------*/
>
> @@ -466,7 +427,7 @@ MODULE_DEVICE_TABLE(pci, pci_ids);
>
> /* pci driver glue; this is a "new style" PCI driver module */
> static struct pci_driver ehci_pci_driver = {
> - .name = (char *) hcd_name,
> + .name = hcd_name,
> .id_table = pci_ids,
>
> .probe = usb_hcd_pci_probe,
> @@ -479,3 +440,33 @@ static struct pci_driver ehci_pci_driver
> },
> #endif
> };
> +
> +static int __init ehci_pci_init(void)
> +{
> + if (usb_disabled())
> + return -ENODEV;
> +
> + pr_info("%s: " DRIVER_DESC "\n", hcd_name);
> +
> + /* Copy the generic driver, then add our own functions and overrides */
> + ehci_pci_hc_driver = ehci_hc_driver;
> + ehci_pci_hc_driver.description = hcd_name;
> + ehci_pci_hc_driver.reset = ehci_pci_setup;
> + ehci_pci_hc_driver.pci_suspend = ehci_pci_suspend;
> + ehci_pci_hc_driver.pci_resume = ehci_pci_resume;
> + ehci_pci_hc_driver.update_device = ehci_update_device;
I would rather see ehci-pci.c passing a "ops" structure with a set of
function pointers to the core layer. PCI suspend and resume shouldn't be
exposed to ehci core layer, btw. If we make ehci-pci's device a parent
to ehci core's device (should we add one), PM core will already make
sure PCI's suspend is only called after EHCI is suspended, so we can
properly split EHCI-suspend from PCI-suspend. In fact, looking at the
code, there's nothing PCI-specific about ehci_pci_suspend(). It just
calls ehci_suspend(), which shouldn't be exported. In that case, we
don't need pci-suspend/pci-resume at all.
ps: as a bonus to changing as suggested above, we would be able to use
module_pci_driver() :-p
--
balbi
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