sysadmin/ipxe
1
0
Fork 0
mirror of https://github.com/ipxe/ipxe synced 2025-12-14 16:01:38 +03:00
Code Issues Packages Projects Releases Wiki Activity

[ehci] Allow UHCI/OHCI controllers to locate the EHCI companion controller

Browse Source 
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-05-08 16:51:12 +01:00
parent a66fd8920d
commit 9ea8a2daa7
3 changed files with 29 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
src/drivers/usb/ehci.c
View File

@@ -337,6 +337,32 @@ static void ehci_poll_companions ( struct ehci_device *ehci ) {
}
}
/**
* Locate EHCI companion controller
*
* @v pci PCI device
* @ret busdevfn EHCI companion controller bus:dev.fn (if any)
*/
unsigned int ehci_companion ( struct pci_device *pci ) {
struct pci_device tmp;
unsigned int busdevfn;
int rc;
/* Look for an EHCI function on the same PCI device */
busdevfn = pci->busdevfn;
while ( ++busdevfn <= PCI_LAST_FUNC ( pci->busdevfn ) ) {
pci_init ( &tmp, busdevfn );
if ( ( rc = pci_read_config ( &tmp ) ) != 0 )
continue;
if ( tmp.class == PCI_CLASS ( PCI_CLASS_SERIAL,
PCI_CLASS_SERIAL_USB,
PCI_CLASS_SERIAL_USB_EHCI ) )
return busdevfn;
}
return 0;
}
/******************************************************************************
*
* Run / stop / reset