soc/braswell: Add interface to program USB2_COMPBG register

Add interface to program USB2_COMPBG register to set
HS_DISC_BG and HS_SQ reference voltage for each project.

TEST=Get build success and do EFT test

Original-Reviewed-on: https://chromium-review.googlesource.com/300846
Original-Reviewed-by: Shawn N <shawnn@chromium.org>
Original-Tested-by: shkim <sh_.kim@samsung.com>
Change-Id: If2201829e1a16b4f9916547f08c24e9291358325
Signed-off-by: Kenji Chen <kenji.chen@intel.com>
Signed-off-by: shkim <sh_.kim@samsung.com>
Signed-off-by: Hannah Williams <hannah.williams@intel.com>
Reviewed-on: https://review.coreboot.org/12739
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/src/soc/intel/braswell/xhci.c b/src/soc/intel/braswell/xhci.c
new file mode 100644
index 0000000000..e3e3462fa5
--- /dev/null
+++ b/src/soc/intel/braswell/xhci.c
@@ -0,0 +1,62 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2013 Google Inc.
+ * Copyright (C) 2015 Intel Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <arch/acpi.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <stdint.h>
+#include <reg_script.h>
+
+#include <soc/iomap.h>
+#include <soc/iosf.h>
+#include <soc/pci_devs.h>
+#include <soc/pm.h>
+#include <soc/ramstage.h>
+#include <soc/xhci.h>
+
+#include "chip.h"
+
+static void xhci_init(device_t dev)
+{
+	struct soc_intel_braswell_config *config = dev->chip_info;
+
+	if (config && config->usb_comp_bg) {
+		struct reg_script ops[] = {
+			REG_IOSF_WRITE(IOSF_PORT_USBPHY, USBPHY_COMPBG,
+				config->usb_comp_bg),
+			REG_SCRIPT_END
+		};
+		printk(BIOS_INFO, "Override USB2_COMPBG to: 0x%X\n", config->usb_comp_bg);
+		reg_script_run(ops);
+	}
+}
+
+static struct device_operations xhci_device_ops = {
+	.read_resources		= pci_dev_read_resources,
+	.set_resources		= pci_dev_set_resources,
+	.enable_resources	= pci_dev_enable_resources,
+	.init			= xhci_init,
+	.ops_pci		= &soc_pci_ops,
+};
+
+static const struct pci_driver soc_xhci __pci_driver = {
+	.ops	= &xhci_device_ops,
+	.vendor	= PCI_VENDOR_ID_INTEL,
+	.device	= XHCI_DEVID
+};