diff options
Diffstat (limited to 'src/drivers/usb')
| -rw-r--r-- | src/drivers/usb/xhci.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/drivers/usb/xhci.c b/src/drivers/usb/xhci.c index 6306e1580..a71d12788 100644 --- a/src/drivers/usb/xhci.c +++ b/src/drivers/usb/xhci.c @@ -34,6 +34,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include <ipxe/umalloc.h> #include <ipxe/pci.h> #include <ipxe/usb.h> +#include <ipxe/init.h> #include <ipxe/profile.h> #include "xhci.h" @@ -521,6 +522,9 @@ static inline void xhci_dump_port ( struct xhci_device *xhci, ****************************************************************************** */ +/** Prevent the release of ownership back to BIOS */ +static int xhci_legacy_prevent_release; + /** * Initialise USB legacy support * @@ -610,6 +614,12 @@ static void xhci_legacy_release ( struct xhci_device *xhci ) { if ( ! xhci->legacy ) return; + /* Do nothing if releasing ownership is prevented */ + if ( xhci_legacy_prevent_release ) { + DBGC ( xhci, "XHCI %p not releasing ownership to BIOS\n", xhci); + return; + } + /* Release ownership */ writeb ( 0, xhci->cap + xhci->legacy + XHCI_USBLEGSUP_OS ); DBGC ( xhci, "XHCI %p released ownership to BIOS\n", xhci ); @@ -3190,3 +3200,20 @@ struct pci_driver xhci_driver __pci_driver = { .probe = xhci_probe, .remove = xhci_remove, }; + +/** + * Prepare for exit + * + * @v booting System is shutting down for OS boot + */ +static void xhci_shutdown ( int booting ) { + /* If we are shutting down to boot an OS, then prevent the + * release of ownership back to BIOS. + */ + xhci_legacy_prevent_release = booting; +} + +/** Startup/shutdown function */ +struct startup_fn xhci_startup __startup_fn ( STARTUP_LATE ) = { + .shutdown = xhci_shutdown, +}; |