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/*
* 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 <assert.h>
#include <console/console.h>
#include <delay.h>
#include <soc/usb.h>
/* SuperSpeed over Type-C is hard. We don't care about speed in firmware: just
* gate off the SuperSpeed lines to have an unimpaired USB 2.0 connection. */
static void isolate_tcphy(uintptr_t base)
{
write32((void *)(base + TCPHY_ISOLATION_CTRL_OFFSET),
TCPHY_ISOLATION_CTRL_EN |
TCPHY_ISOLATION_CTRL_CMN_EN |
TCPHY_ISOLATION_CTRL_MODE_SEL |
TCPHY_ISOLATION_CTRL_LN_EN(7) |
TCPHY_ISOLATION_CTRL_LN_EN(6) |
TCPHY_ISOLATION_CTRL_LN_EN(5) |
TCPHY_ISOLATION_CTRL_LN_EN(4) |
TCPHY_ISOLATION_CTRL_LN_EN(3) |
TCPHY_ISOLATION_CTRL_LN_EN(2) |
TCPHY_ISOLATION_CTRL_LN_EN(1) |
TCPHY_ISOLATION_CTRL_LN_EN(0));
}
static void reset_dwc3(struct rockchip_usb_dwc3 *dwc3)
{
/* Before Resetting PHY, put Core in Reset */
setbits_le32(&dwc3->ctl, DWC3_GCTL_CORESOFTRESET);
/* Assert USB3 PHY reset */
setbits_le32(&dwc3->usb3pipectl, DWC3_GUSB3PIPECTL_PHYSOFTRST);
/* Assert USB2 PHY reset */
setbits_le32(&dwc3->usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
}
static void setup_dwc3(struct rockchip_usb_dwc3 *dwc3)
{
u32 usb2phycfg = read32(&dwc3->usb2phycfg);
u32 ctl = read32(&dwc3->ctl);
/* Ensure reset_dwc3() has been called before this. */
assert(ctl & DWC3_GCTL_CORESOFTRESET);
/* Clear USB3 PHY reset (oddly enough, this is really necessary). */
clrbits_le32(&dwc3->usb3pipectl, DWC3_GUSB3PIPECTL_PHYSOFTRST);
/* Clear USB2 PHY and core reset. */
usb2phycfg &= ~DWC3_GUSB2PHYCFG_PHYSOFTRST;
ctl &= ~DWC3_GCTL_CORESOFTRESET;
/* We are hard-coding DWC3 core to Host Mode */
ctl &= ~DWC3_GCTL_PRTCAP_MASK;
ctl |= 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.
*/
usb2phycfg &= ~(DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS |
DWC3_GUSB2PHYCFG_USB2TRDTIM_MASK |
DWC3_GUSB2PHYCFG_PHYIF_MASK);
usb2phycfg |= DWC3_GUSB2PHYCFG_PHYIF(1) |
DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_16_BIT);
write32(&dwc3->usb2phycfg, usb2phycfg);
write32(&dwc3->ctl, ctl);
}
void reset_usb_otg0(void)
{
printk(BIOS_DEBUG, "Starting DWC3 reset for USB OTG0\n");
reset_dwc3(rockchip_usb_otg0_dwc3);
}
void reset_usb_otg1(void)
{
printk(BIOS_DEBUG, "Starting DWC3 reset for USB OTG1\n");
reset_dwc3(rockchip_usb_otg1_dwc3);
}
void setup_usb_otg0(void)
{
isolate_tcphy(USB_OTG0_TCPHY_BASE);
setup_dwc3(rockchip_usb_otg0_dwc3);
printk(BIOS_DEBUG, "DWC3 setup for USB OTG0 finished\n");
}
void setup_usb_otg1(void)
{
isolate_tcphy(USB_OTG1_TCPHY_BASE);
setup_dwc3(rockchip_usb_otg1_dwc3);
printk(BIOS_DEBUG, "DWC3 setup for USB OTG1 finished\n");
}
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