From eb70e5ab8f95a81283623c03d2c99dfc59fcb319 Mon Sep 17 00:00:00 2001 From: Alexander Shishkin Date: Fri, 11 May 2012 17:25:54 +0300 Subject: usb: chipidea: add host role This adds EHCI host support to the chipidea driver. We want it to be part of the hdrc driver and not a standalone (sub-)driver module, as the structure of ehci-hcd.c suggests, so for chipidea controller we hack it to not provide platform-related code, but only the ehci hcd. The ehci-platform driver won't work for us here too, because the controller uses the same registers for both device and host mode and also otg-related bits, so it's not really possible to put ehci registers into a separate resource. This is not a pretty solution, but the alternative is exporting symbols from the chipidea driver to a ehci-chipidea driver and doing all the module refcounting. Signed-off-by: Alexander Shishkin Cc: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ehci-hcd.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/usb/host') diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index de1e689d3df0..5cb775b1802d 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -1246,6 +1246,13 @@ static int ehci_get_frame (struct usb_hcd *hcd) } /*-------------------------------------------------------------------------*/ +/* + * The EHCI in ChipIdea HDRC cannot be a separate module or device, + * because its registers (and irq) are shared between host/gadget/otg + * functions and in order to facilitate role switching we cannot + * give the ehci driver exclusive access to those. + */ +#ifndef CHIPIDEA_EHCI MODULE_DESCRIPTION(DRIVER_DESC); MODULE_AUTHOR (DRIVER_AUTHOR); @@ -1504,3 +1511,4 @@ static void __exit ehci_hcd_cleanup(void) } module_exit(ehci_hcd_cleanup); +#endif /* CHIPIDEA_EHCI */ -- cgit v1.2.3