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usb: dwc3: Add DWC3 controller driver support

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Add support for DWC3 XHCI controller driver

Signed-off-by: Ramneek Mehresh <ramneek.mehresh@freescale.com>
This commit is contained in:
Ramneek Mehresh 2015-05-29 14:47:15 +05:30 committed by Marek Vasut
parent b217c89e85
commit dc9cdf859e
3 changed files with 98 additions and 0 deletions
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1
drivers/usb/host/Makefile
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@ -51,6 +51,7 @@ obj-$(CONFIG_USB_EHCI_ZYNQ) += ehci-zynq.o
# xhci
obj-$(CONFIG_USB_XHCI) += xhci.o xhci-mem.o xhci-ring.o
obj-$(CONFIG_USB_XHCI_DWC3) += xhci-dwc3.o
obj-$(CONFIG_USB_XHCI_KEYSTONE) += xhci-keystone.o
obj-$(CONFIG_USB_XHCI_EXYNOS) += xhci-exynos5.o
obj-$(CONFIG_USB_XHCI_OMAP) += xhci-omap.o

91
drivers/usb/host/xhci-dwc3.c Normal file
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@ -0,0 +1,91 @@
/*
* Copyright 2015 Freescale Semiconductor, Inc.
*
* DWC3 controller driver
*
* Author: Ramneek Mehresh<ramneek.mehresh@freescale.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <linux/usb/dwc3.h>
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));
}
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);
/* 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;
}

6
include/linux/usb/dwc3.h
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@ -191,4 +191,10 @@ struct dwc3 { /* offset: 0xC100 */
#define DWC3_DCTL_CSFTRST (1 << 30)
#define DWC3_DCTL_LSFTRST (1 << 29)
#ifdef CONFIG_USB_XHCI_DWC3
void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode);
void dwc3_core_soft_reset(struct dwc3 *dwc3_reg);
int dwc3_core_init(struct dwc3 *dwc3_reg);
void usb_phy_reset(struct dwc3 *dwc3_reg);
#endif
#endif /* __DWC3_H_ */