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>

4 files changed, 52 insertions, 2 deletions

diff --git a/src/soc/amd/stoneyridge/acpi/usb.asl b/src/soc/amd/stoneyridge/acpi/usb.asl
index 3fd76b22dd..6c6ff9c9d0 100644
--- a/src/soc/amd/stoneyridge/acpi/usb.asl
+++ b/src/soc/amd/stoneyridge/acpi/usb.asl
@@ -17,10 +17,24 @@
 /* 0:12.0 - EHCI */
 Device(EHC0) {
 	Name(_ADR, 0x00120000)
+	Device (RHUB) {
+		Name (_ADR, Zero)
+		Device (HS01) { Name (_ADR, 1) }
+		Device (HS02) { Name (_ADR, 2) }
+		Device (HS03) { Name (_ADR, 3) }
+		Device (HS04) { Name (_ADR, 4) }
+		Device (HS05) { Name (_ADR, 5) }
+		Device (HS06) { Name (_ADR, 6) }
+		Device (HS07) { Name (_ADR, 7) }
+		Device (HS08) { Name (_ADR, 8) }
+	}
 } /* end EHC0 */
 
 
 /* 0:10.0 - XHCI 0*/
 Device(XHC0) {
 	Name(_ADR, 0x00100000)
+	Device (SS01) { Name (_ADR, 1) }
+	Device (SS02) { Name (_ADR, 2) }
+	Device (SS03) { Name (_ADR, 3) }
 } /* end XHC0 */
diff --git a/src/soc/amd/stoneyridge/chip.c b/src/soc/amd/stoneyridge/chip.c
index 08eecb95f5..46dcfa80dd 100644
--- a/src/soc/amd/stoneyridge/chip.c
+++ b/src/soc/amd/stoneyridge/chip.c
@@ -22,6 +22,7 @@
 #include <device/pci.h>
 #include <drivers/i2c/designware/dw_i2c.h>
 #include <romstage_handoff.h>
+#include <soc/acpi.h>
 #include <soc/cpu.h>
 #include <soc/northbridge.h>
 #include <soc/pci_devs.h>
@@ -42,10 +43,41 @@ struct device_operations cpu_bus_ops = {
 	.acpi_fill_ssdt_generator = generate_cpu_entries,
 };
 
-static const char *soc_acpi_name(const struct device *dev)
+const char *soc_acpi_name(const struct device *dev)
 {
 	if (dev->path.type == DEVICE_PATH_DOMAIN)
 		return "PCI0";
+
+	if (dev->path.type == DEVICE_PATH_USB) {
+		switch (dev->path.usb.port_type) {
+		case 0:
+			/* Root Hub */
+			return "RHUB";
+		case 2:
+			/* USB2 ports */
+			switch (dev->path.usb.port_id) {
+			case 0: return "HS01";
+			case 1: return "HS02";
+			case 2: return "HS03";
+			case 3: return "HS04";
+			case 4: return "HS05";
+			case 5: return "HS06";
+			case 6: return "HS07";
+			case 7: return "HS08";
+			}
+			break;
+		case 3:
+			/* USB3 ports */
+			switch (dev->path.usb.port_id) {
+			case 0: return "SS01";
+			case 1: return "SS02";
+			case 2: return "SS03";
+			}
+			break;
+		}
+		return NULL;
+	}
+
 	if (dev->path.type != DEVICE_PATH_PCI)
 		return NULL;
 
diff --git a/src/soc/amd/stoneyridge/include/soc/acpi.h b/src/soc/amd/stoneyridge/include/soc/acpi.h
index 3e58d9a0c7..69ab599509 100644
--- a/src/soc/amd/stoneyridge/include/soc/acpi.h
+++ b/src/soc/amd/stoneyridge/include/soc/acpi.h
@@ -35,4 +35,6 @@ unsigned long southbridge_write_acpi_tables(device_t device,
 
 void southbridge_inject_dsdt(device_t device);
 
+const char *soc_acpi_name(const struct device *dev);
+
 #endif /* __SOC_STONEYRIDGE_ACPI_H__ */
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,
 };