soc/amd/stoneyridge: Support ACPI USB code generation

To support generating USB devices in ACPI the platform needs to
know how to determine a device name for each USB port, and for any
root hubs that may be present.

The AMD Stoney Ridge platform has separate controllers for USB 2.0
and USB 3.0.  The USB 2.0 ports are connected through a hub to an
EHCI controller while the USB 3.0 ports are directly connected to
the xHCI controller.

This topology is described in ACPI and the port names are exposed
by the soc_acpi_name() function.

The USB controllers are configured to scan for static USB devices
in the devicetree and use the soc_acpi_name() function to identify
them.

Change-Id: I2bb677f84a49d2531929985dba319455b88e1686
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/26175
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/soc/amd/stoneyridge/usb.c b/src/soc/amd/stoneyridge/usb.c
index e6d608e7dc..6007af116b 100644
--- a/src/soc/amd/stoneyridge/usb.c
+++ b/src/soc/amd/stoneyridge/usb.c
@@ -21,6 +21,7 @@
 #include <device/pci_ops.h>
 #include <device/pci_ehci.h>
 #include <arch/io.h>
+#include <soc/acpi.h>
 #include <soc/pci_devs.h>
 #include <soc/southbridge.h>
 
@@ -64,7 +65,8 @@ static struct device_operations usb_ops = {
 	.set_resources = pci_dev_set_resources,
 	.enable_resources = pci_dev_enable_resources,
 	.init = set_usb_over_current,
-	.scan_bus = NULL,
+	.scan_bus = scan_usb_bus,
+	.acpi_name = soc_acpi_name,
 	.ops_pci = &lops_pci,
 };