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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2015 Freescale Semiconductor, Inc.
*
* DWC3 controller driver
*
* Author: Ramneek Mehresh<ramneek.mehresh@freescale.com>
*/
#include <common.h>
#include <dm.h>
#include <fdtdec.h>
#include <generic-phy.h>
#include <usb.h>
#include <dwc3-uboot.h>
#include <usb/xhci.h>
#include <asm/io.h>
#include <linux/usb/dwc3.h>
#include <linux/usb/otg.h>
struct xhci_dwc3_platdata {
struct phy *usb_phys;
int num_phys;
};
void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode)
{
clrsetbits_le32(&dwc3_reg->g_ctl,
DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG),
DWC3_GCTL_PRTCAPDIR(mode));
}
static void dwc3_phy_reset(struct dwc3 *dwc3_reg)
{
/* Assert USB3 PHY reset */
setbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
/* Assert USB2 PHY reset */
setbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
mdelay(100);
/* Clear USB3 PHY reset */
clrbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
/* Clear USB2 PHY reset */
clrbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
}
void dwc3_core_soft_reset(struct dwc3 *dwc3_reg)
{
/* Before Resetting PHY, put Core in Reset */
setbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET);
/* reset USB3 phy - if required */
dwc3_phy_reset(dwc3_reg);
mdelay(100);
/* After PHYs are stable we can take Core out of reset state */
clrbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET);
}
int dwc3_core_init(struct dwc3 *dwc3_reg)
{
u32 reg;
u32 revision;
unsigned int dwc3_hwparams1;
revision = readl(&dwc3_reg->g_snpsid);
/* This should read as U3 followed by revision number */
if ((revision & DWC3_GSNPSID_MASK) != 0x55330000) {
puts("this is not a DesignWare USB3 DRD Core\n");
return -1;
}
dwc3_core_soft_reset(dwc3_reg);
dwc3_hwparams1 = readl(&dwc3_reg->g_hwparams1);
reg = readl(&dwc3_reg->g_ctl);
reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
reg &= ~DWC3_GCTL_DISSCRAMBLE;
switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc3_hwparams1)) {
case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
reg &= ~DWC3_GCTL_DSBLCLKGTNG;
break;
default:
debug("No power optimization available\n");
}
/*
* WORKAROUND: DWC3 revisions <1.90a have a bug
* where the device can fail to connect at SuperSpeed
* and falls back to high-speed mode which causes
* the device to enter a Connect/Disconnect loop
*/
if ((revision & DWC3_REVISION_MASK) < 0x190a)
reg |= DWC3_GCTL_U2RSTECN;
writel(reg, &dwc3_reg->g_ctl);
return 0;
}
void dwc3_set_fladj(struct dwc3 *dwc3_reg, u32 val)
{
setbits_le32(&dwc3_reg->g_fladj, GFLADJ_30MHZ_REG_SEL |
GFLADJ_30MHZ(val));
}
#if CONFIG_IS_ENABLED(DM_USB)
static int xhci_dwc3_probe(struct udevice *dev)
{
struct xhci_hcor *hcor;
struct xhci_hccr *hccr;
struct dwc3 *dwc3_reg;
enum usb_dr_mode dr_mode;
struct xhci_dwc3_platdata *plat = dev_get_platdata(dev);
const char *phy;
u32 reg;
int ret;
hccr = (struct xhci_hccr *)((uintptr_t)dev_read_addr(dev));
hcor = (struct xhci_hcor *)((uintptr_t)hccr +
HC_LENGTH(xhci_readl(&(hccr)->cr_capbase)));
ret = dwc3_setup_phy(dev, &plat->usb_phys, &plat->num_phys);
if (ret && (ret != -ENOTSUPP))
return ret;
dwc3_reg = (struct dwc3 *)((char *)(hccr) + DWC3_REG_OFFSET);
dwc3_core_init(dwc3_reg);
/* Set dwc3 usb2 phy config */
reg = readl(&dwc3_reg->g_usb2phycfg[0]);
phy = dev_read_string(dev, "phy_type");
if (phy && strcmp(phy, "utmi_wide") == 0) {
reg |= DWC3_GUSB2PHYCFG_PHYIF;
reg &= ~DWC3_GUSB2PHYCFG_USBTRDTIM_MASK;
reg |= DWC3_GUSB2PHYCFG_USBTRDTIM_16BIT;
}
if (dev_read_bool(dev, "snps,dis_enblslpm-quirk"))
reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
if (dev_read_bool(dev, "snps,dis-u2-freeclk-exists-quirk"))
reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS;
if (dev_read_bool(dev, "snps,dis_u2_susphy_quirk"))
reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
writel(reg, &dwc3_reg->g_usb2phycfg[0]);
dr_mode = usb_get_dr_mode(dev_of_offset(dev));
if (dr_mode == USB_DR_MODE_UNKNOWN)
/* by default set dual role mode to HOST */
dr_mode = USB_DR_MODE_HOST;
dwc3_set_mode(dwc3_reg, dr_mode);
return xhci_register(dev, hccr, hcor);
}
static int xhci_dwc3_remove(struct udevice *dev)
{
struct xhci_dwc3_platdata *plat = dev_get_platdata(dev);
dwc3_shutdown_phy(dev, plat->usb_phys, plat->num_phys);
return xhci_deregister(dev);
}
static const struct udevice_id xhci_dwc3_ids[] = {
{ .compatible = "snps,dwc3" },
{ }
};
U_BOOT_DRIVER(xhci_dwc3) = {
.name = "xhci-dwc3",
.id = UCLASS_USB,
.of_match = xhci_dwc3_ids,
.probe = xhci_dwc3_probe,
.remove = xhci_dwc3_remove,
.ops = &xhci_usb_ops,
.priv_auto_alloc_size = sizeof(struct xhci_ctrl),
.platdata_auto_alloc_size = sizeof(struct xhci_dwc3_platdata),
.flags = DM_FLAG_ALLOC_PRIV_DMA,
};
#endif
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