rockchip: gru: Add USB DRD DWC3 controller support

This patch adds code to initialize the two DWC3 USB
host controllers, and uses them to initialize USB3.0
on the gru rk3399 board.

BRANCH=none
BUG=chrome-os-partner:52684
TEST=boot from USB3.0 on gru/kevin rk3399 platform

Change-Id: If6a6e56f3a7c7ce8e8b098634cfc2f250a91810d
Signed-off-by: Martin Roth <martinroth@chromium.org>
Original-Commit-Id: 0306a9e
Original-Change-Id: I796fa1133510876f75873d134ea752e1b52e40a8
Original-Signed-off-by: Liangfeng Wu <wulf@rock-chips.com>
Original-Signed-off-by: Douglas Anderson <dianders@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/347524
Original-Commit-Ready: Brian Norris <briannorris@chromium.org>
Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/15112
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>

1 files changed, 107 insertions, 0 deletions

diff --git a/src/soc/rockchip/rk3399/usb.c b/src/soc/rockchip/rk3399/usb.c
new file mode 100644
index 0000000000..df0305f8c3
--- /dev/null
+++ b/src/soc/rockchip/rk3399/usb.c
@@ -0,0 +1,107 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Rockchip, Inc.
+ *
+ * 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/io.h>
+#include <console/console.h>
+#include <delay.h>
+#include <soc/usb.h>
+
+static void reset_dwc3(struct rockchip_usb_drd_dwc3 *dwc3_reg)
+{
+	/* Before Resetting PHY, put Core in Reset */
+	setbits_le32(&dwc3_reg->ctl, DWC3_GCTL_CORESOFTRESET);
+	/* Assert USB3 PHY reset */
+	setbits_le32(&dwc3_reg->usb3pipectl, DWC3_GUSB3PIPECTL_PHYSOFTRST);
+	/* Assert USB2 PHY reset */
+	setbits_le32(&dwc3_reg->usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
+}
+
+static void setup_dwc3(struct rockchip_usb_drd_dwc3 *dwc3_reg)
+{
+	u32 reg;
+	u32 revision;
+	u32 dwc3_hwparams1;
+
+	/* Clear USB3 PHY reset */
+	clrbits_le32(&dwc3_reg->usb3pipectl, DWC3_GUSB3PIPECTL_PHYSOFTRST);
+	/* Clear USB2 PHY reset */
+	clrbits_le32(&dwc3_reg->usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
+	/* After PHYs are stable we can take Core out of reset state */
+	clrbits_le32(&dwc3_reg->ctl, DWC3_GCTL_CORESOFTRESET);
+
+	revision = read32(&dwc3_reg->snpsid);
+	/* This should read as U3 followed by revision number */
+	if ((revision & DWC3_GSNPSID_MASK) != 0x55330000) {
+		printk(BIOS_ERR, "ERROR: not a DesignWare USB3 DRD Core\n");
+		return;
+	}
+
+	dwc3_hwparams1 = read32(&dwc3_reg->hwparams1);
+
+	reg = read32(&dwc3_reg->ctl);
+	reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
+	reg &= ~DWC3_GCTL_DISSCRAMBLE;
+	if (DWC3_GHWPARAMS1_EN_PWROPT(dwc3_hwparams1) ==
+	    DWC3_GHWPARAMS1_EN_PWROPT_CLK)
+		reg &= ~DWC3_GCTL_DSBLCLKGTNG;
+	else
+		printk(BIOS_DEBUG, "No power optimization available\n");
+
+	write32(&dwc3_reg->ctl, reg);
+
+	/* We are hard-coding DWC3 core to Host Mode */
+	clrsetbits_le32(&dwc3_reg->ctl,
+			DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG),
+			DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_HOST));
+	/*
+	 * Configure USB phy interface of DWC3 core.
+	 * For Rockchip rk3399 SOC DWC3 core:
+	 * 1. Clear U2_FREECLK_EXITS.
+	 * 2. Select UTMI+ PHY with 16-bit interface.
+	 * 3. Set USBTRDTIM to the corresponding value
+	 * according to the UTMI+ PHY interface.
+	 */
+	reg = read32(&dwc3_reg->usb2phycfg);
+	reg &= ~(DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS |
+		DWC3_GUSB2PHYCFG_USB2TRDTIM_MASK |
+		DWC3_GUSB2PHYCFG_PHYIF_MASK);
+	reg |= DWC3_GUSB2PHYCFG_PHYIF(1) |
+	       DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_16_BIT);
+	write32(&dwc3_reg->usb2phycfg, reg);
+}
+
+void reset_usb_drd0_dwc3(void)
+{
+	printk(BIOS_DEBUG, "Starting DWC3 reset for USB DRD0\n");
+	reset_dwc3(rockchip_usb_drd0_dwc3);
+}
+
+void reset_usb_drd1_dwc3(void)
+{
+	printk(BIOS_DEBUG, "Starting DWC3 reset for USB DRD1\n");
+	reset_dwc3(rockchip_usb_drd1_dwc3);
+}
+
+void setup_usb_drd0_dwc3(void)
+{
+	setup_dwc3(rockchip_usb_drd0_dwc3);
+	printk(BIOS_DEBUG, "DWC3 setup for USB DRD0 finished\n");
+}
+
+void setup_usb_drd1_dwc3(void)
+{
+	setup_dwc3(rockchip_usb_drd1_dwc3);
+	printk(BIOS_DEBUG, "DWC3 setup for USB DRD1 finished\n");
+}