Add support for DWC3 XHCI controller driver
Signed-off-by: Ramneek Mehresh ramneek.mehresh@freescale.com --- drivers/usb/host/Makefile | 1 + drivers/usb/host/xhci-dwc3.c | 75 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/usb/dwc3.h | 4 +++ 3 files changed, 80 insertions(+) create mode 100644 drivers/usb/host/xhci-dwc3.c
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile index 7658f87..c0d95cf 100644 --- a/drivers/usb/host/Makefile +++ b/drivers/usb/host/Makefile @@ -49,6 +49,7 @@ 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 diff --git a/drivers/usb/host/xhci-dwc3.c b/drivers/usb/host/xhci-dwc3.c new file mode 100644 index 0000000..c875851 --- /dev/null +++ b/drivers/usb/host/xhci-dwc3.c @@ -0,0 +1,75 @@ +/* + * Copyright 2015 Freescale Semiconductor, Inc. + * + * DWC3 controller driver + * + * Author: Ramneek Mehreshramneek.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_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 */ + usb_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; +} + diff --git a/include/linux/usb/dwc3.h b/include/linux/usb/dwc3.h index 7edc760..c21878c 100644 --- a/include/linux/usb/dwc3.h +++ b/include/linux/usb/dwc3.h @@ -191,4 +191,8 @@ struct dwc3 { /* offset: 0xC100 */ #define DWC3_DCTL_CSFTRST (1 << 30) #define DWC3_DCTL_LSFTRST (1 << 29)
+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 /* __DWC3_H_ */