From 4dd34eee092276e47a9be41ff9a51dfcde38d759 Mon Sep 17 00:00:00 2001
From: Lee Leahy <leroy.p.leahy@intel.com>
Date: Mon, 2 May 2016 14:31:02 -0700
Subject: soc/intel/quark: Add USB PHY initialization

Add register access support using register scripts.
Initialize the USB PHY using register scripts.

TEST=Build and run on Galileo Gen2

Change-Id: I34a8e78eab3c7314ca34343eccc8aeef0622798a
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/14496
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
---
 src/soc/intel/quark/usb.c | 92 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 src/soc/intel/quark/usb.c

(limited to 'src/soc/intel/quark/usb.c')

diff --git a/src/soc/intel/quark/usb.c b/src/soc/intel/quark/usb.c
new file mode 100644
index 0000000000..460ef23a79
--- /dev/null
+++ b/src/soc/intel/quark/usb.c
@@ -0,0 +1,92 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Intel Corporation.
+ *
+ * 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 <console/console.h>
+#include <device/pci_ids.h>
+#include <soc/pci_devs.h>
+#include <soc/reg_access.h>
+
+/* USB Phy Registers */
+#define USB2_GLOBAL_PORT  0x4001
+#define USB2_PLL1         0x7F02
+#define USB2_PLL2         0x7F03
+#define USB2_COMPBG       0x7F04
+
+/* In order to configure the USB PHY to use clk120 (ickusbcoreclk) as PLL
+ * reference clock and Port2 as a USB device port, the following sequence must
+ * be followed
+ */
+static const struct reg_script init_script[] = {
+
+	/* Sighting #4930631 PDNRESCFG [8:7] of USB2_GLOBAL_PORT = 11b.
+	 * For port 0 & 1 as host and port 2 as device.
+	 */
+	REG_USB_RXW(USB2_GLOBAL_PORT, ~(BIT8 | BIT7 | BIT1), (BIT8 | BIT7)),
+
+	/*
+	 * Sighting #4930653 Required BIOS change on Disconnect vref to change
+	 * to 600mV.
+	 */
+	REG_USB_RXW(USB2_COMPBG, ~(BIT10 | BIT9 | BIT8 | BIT7),
+		(BIT10 | BIT7)),
+
+	/* Sideband register write to USB AFE (Phy)
+	 * (pllbypass) to bypass/Disable PLL before switch
+	 */
+	REG_USB_OR(USB2_PLL2, BIT29),
+
+	/* Sideband register write to USB AFE (Phy)
+	 * (coreclksel) to select 120MHz (ickusbcoreclk) clk source.
+	 * (Default 0 to select 96MHz (ickusbclk96_npad/ppad))
+	 */
+	REG_USB_OR(USB2_PLL1, BIT1),
+
+	/* Sideband register write to USB AFE (Phy)
+	 * (divide by 8) to achieve internal 480MHz clock
+	 * for 120MHz input refclk.  (Default: 4'b1000 (divide by 10) for 96MHz)
+	 */
+	REG_USB_RXW(USB2_PLL1, ~(BIT6 | BIT5 | BIT4 | BIT3), BIT6),
+
+	/* Sideband register write to USB AFE (Phy)
+	 * Clear (pllbypass)
+	 */
+	REG_USB_AND(USB2_PLL2, ~BIT29),
+
+	/* Sideband register write to USB AFE (Phy)
+	 * Set (startlock) to force the PLL FSM to restart the lock
+	 * sequence due to input clock/freq switch.
+	 */
+	REG_USB_OR(USB2_PLL2, BIT24),
+	REG_SCRIPT_END
+};
+
+static void init(device_t dev)
+{
+	printk(BIOS_INFO, "Initializing USB PLLs\n");
+	reg_script_run_on_dev(dev, init_script);
+}
+
+static struct device_operations device_ops = {
+	.read_resources		= pci_dev_read_resources,
+	.set_resources		= pci_dev_set_resources,
+	.enable_resources	= pci_dev_enable_resources,
+	.init			= init,
+};
+
+static const struct pci_driver driver __pci_driver = {
+	.ops	= &device_ops,
+	.vendor	= PCI_VENDOR_ID_INTEL,
+	.device	= EHCI_DEVID,
+};
-- 
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