soc/intel/alderlake: Add soc_get_xhci_usb_info() for elog support

Add MMIO offsets for USB2 and USB3 port status registers, for
both north (TCSS) and south (PCH) XHCI controllers; implement
soc_get_xhci_usb_info() to return the appropriate entries for
elog.

Change-Id: I5ceb73707a0af0542a07027fd5c873a9658b19d6
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47397
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/alderlake/Makefile.inc

@@ -45,6 +45,7 @@ ramstage-y += reset.c
 ramstage-y += smmrelocate.c
 ramstage-y += soundwire.c
 ramstage-y += systemagent.c
+ramstage-y += xhci.c
 
 smm-y += gpio.c
 smm-y += p2sb.c

src/soc/intel/alderlake/xhci.c

@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/pci_type.h>
+#include <intelblocks/xhci.h>
+#include <soc/pci_devs.h>
+
+/*
+ * Information obtained from Intel doc# 630094, ADL-P PCH EDS Vol. 2,
+ * as well as doc# 626817, ADL-P PCH EDS Vol. 1
+ */
+
+#define PCH_XHCI_USB2_PORT_STATUS_REG	0x480
+#define PCH_XHCI_USB3_PORT_STATUS_REG	0x540
+#define PCH_XHCI_USB2_PORT_NUM		10
+#define PCH_XHCI_USB3_PORT_NUM		4
+
+#define TCSS_XHCI_USB2_PORT_STATUS_REG	0x480
+#define TCSS_XHCI_USB3_PORT_STATUS_REG	0x540
+#define TCSS_XHCI_USB2_PORT_NUM		10
+#define TCSS_XHCI_USB3_PORT_NUM		4
+
+static const struct xhci_usb_info usb_info = {
+	.usb2_port_status_reg = PCH_XHCI_USB2_PORT_STATUS_REG,
+	.num_usb2_ports = PCH_XHCI_USB2_PORT_NUM,
+	.usb3_port_status_reg = PCH_XHCI_USB3_PORT_STATUS_REG,
+	.num_usb3_ports = PCH_XHCI_USB3_PORT_NUM,
+};
+
+static const struct xhci_usb_info tcss_usb_info = {
+	.usb2_port_status_reg = TCSS_XHCI_USB2_PORT_STATUS_REG,
+	.num_usb2_ports = TCSS_XHCI_USB2_PORT_NUM,
+	.usb3_port_status_reg = TCSS_XHCI_USB3_PORT_STATUS_REG,
+	.num_usb3_ports = TCSS_XHCI_USB3_PORT_NUM,
+};
+
+const struct xhci_usb_info *soc_get_xhci_usb_info(pci_devfn_t xhci_dev)
+{
+	if (xhci_dev == PCH_DEVFN_XHCI)
+		return &usb_info;
+	else if (xhci_dev == SA_DEVFN_TCSS_XHCI)
+		return &tcss_usb_info;
+
+	return NULL;
+}