diff options
| author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2012-05-11 17:25:54 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-05-11 16:56:15 -0700 |
| commit | eb70e5ab8f95a81283623c03d2c99dfc59fcb319 (patch) | |
| tree | fc20c9d10484171490cf6b69f7f5b6f934803366 /drivers/usb/host | |
| parent | 758fc9860c19eceb56e5886a5225db623c521971 (diff) | |
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 <alexander.shishkin@linux.intel.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/ehci-hcd.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index de1e689d3df..5cb775b1802 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 */ |