Add USB XHCI stack support for USB2.0/USB3.0 devices

Signed-off-by: Ramneek Mehresh ramneek.mehresh@freescale.com --- drivers/usb/host/Makefile | 1 + drivers/usb/host/xhci-fsl.c | 147 +++++++++++++++++++++++++++++++++++++++++++ include/linux/usb/xhci-fsl.h | 48 ++++++++++++++ 3 files changed, 196 insertions(+) create mode 100644 drivers/usb/host/xhci-fsl.c create mode 100644 include/linux/usb/xhci-fsl.h

diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile index 04c1a64..388d13a 100644 --- a/drivers/usb/host/Makefile +++ b/drivers/usb/host/Makefile @@ -23,6 +23,7 @@ ifdef CONFIG_MPC512X obj-$(CONFIG_USB_EHCI_FSL) += ehci-mpc512x.o else obj-$(CONFIG_USB_EHCI_FSL) += ehci-fsl.o +obj-$(CONFIG_USB_XHCI_FSL) += xhci-fsl.o endif obj-$(CONFIG_USB_EHCI_FARADAY) += ehci-faraday.o obj-$(CONFIG_USB_EHCI_EXYNOS) += ehci-exynos.o diff --git a/drivers/usb/host/xhci-fsl.c b/drivers/usb/host/xhci-fsl.c new file mode 100644 index 0000000..381c322 --- /dev/null +++ b/drivers/usb/host/xhci-fsl.c @@ -0,0 +1,147 @@ +/* + * FSL USB HOST xHCI Controller + * + * (C) Copyright 2014 + * Freescale Semiconductor, <www.freescale.com> + * + * Author: Ramneek Mehreshramneek.mehresh@freescale.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <usb.h> +#include <asm-generic/errno.h> +#include <linux/compat.h> +#include <linux/usb/dwc3.h> +#include <linux/usb/xhci-fsl.h> +#include "xhci.h" + +/* Declare global data pointer */ +DECLARE_GLOBAL_DATA_PTR; + +static struct fsl_xhci fsl_xhci; + +inline int __board_usb_init(int index, enum usb_init_type init) +{ + return 0; +} +int board_usb_init(int index, enum usb_init_type init) + __attribute__((weak, alias("__board_usb_init"))); + +static 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_core_soft_reset(struct dwc3 *dwc3_reg) +{ + /* Before Resetting PHY, put Core in Reset */ + setbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET); + + /* After PHYs are stable we can take Core out of reset state */ + clrbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET); +} + +static 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; +} + +static int fsl_xhci_core_init(struct fsl_xhci *fsl_xhci) +{ + int ret = 0; + + ret = dwc3_core_init(fsl_xhci->dwc3_reg); + if (ret) { + debug("%s:failed to initialize core\n", __func__); + return ret; + } + + /* We are hard-coding DWC3 core to Host Mode */ + dwc3_set_mode(fsl_xhci->dwc3_reg, DWC3_GCTL_PRTCAP_HOST); + + return ret; +} + +static void fsl_xhci_core_exit(struct fsl_xhci *fsl_xhci) +{ + return; +} + +int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor) +{ + struct fsl_xhci *ctx = &fsl_xhci; + int ret = 0; + + ctx->hcd = (struct xhci_hccr *)FSL_XHCI_BASE; + ctx->dwc3_reg = (struct dwc3 *)(FSL_XHCI_BASE + DWC3_REG_OFFSET); + + ret = board_usb_init(index, USB_INIT_HOST); + if (ret != 0) { + puts("Failed to initialize board for USB\n"); + return ret; + } + + ret = fsl_xhci_core_init(ctx); + if (ret < 0) { + puts("Failed to initialize xhci\n"); + return ret; + } + + *hccr = (struct xhci_hccr *)(FSL_XHCI_BASE); + *hcor = (struct xhci_hcor *)((uint32_t) *hccr + + HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase))); + + debug("fsl-xhci: init hccr %x and hcor %x hc_length %d\n", + (uint32_t)*hccr, (uint32_t)*hcor, + (uint32_t)HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase))); + + return ret; +} + +void xhci_hcd_stop(int index) +{ + struct fsl_xhci *ctx = &fsl_xhci; + + fsl_xhci_core_exit(ctx); +} diff --git a/include/linux/usb/xhci-fsl.h b/include/linux/usb/xhci-fsl.h new file mode 100644 index 0000000..1dc1e12 --- /dev/null +++ b/include/linux/usb/xhci-fsl.h @@ -0,0 +1,48 @@ +/* + * (C) Copyright 2014 + * Freescale Semiconductor Inc, <www.freescale.com> + * + * Author: Ramneek Mehresh ramneek.mehresh@freescale.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _ASM_ARCH_XHCI_FSL_H_ +#define _ASM_ARCH_XHCI_FSL_H_ + +/* Default to the FSL XHCI defines */ +#define FSL_XHCI_BASE 0x3100000 + +/* USBOTGSS_WRAPPER definitions */ +#define USBOTGSS_WRAPRESET (1 << 17) +#define USBOTGSS_DMADISABLE (1 << 16) +#define USBOTGSS_STANDBYMODE_NO_STANDBY (1 << 4) +#define USBOTGSS_STANDBYMODE_SMRT (1 << 5) +#define USBOTGSS_STANDBYMODE_SMRT_WKUP (0x3 << 4) +#define USBOTGSS_IDLEMODE_NOIDLE (1 << 2) +#define USBOTGSS_IDLEMODE_SMRT (1 << 3) +#define USBOTGSS_IDLEMODE_SMRT_WKUP (0x3 << 2) + +/* USBOTGSS_IRQENABLE_SET_0 bit */ +#define USBOTGSS_COREIRQ_EN (1 << 0) + +/* USBOTGSS_IRQENABLE_SET_1 bits */ +#define USBOTGSS_IRQ_SET_1_IDPULLUP_FALL_EN (1 << 0) +#define USBOTGSS_IRQ_SET_1_DISCHRGVBUS_FALL_EN (1 << 3) +#define USBOTGSS_IRQ_SET_1_CHRGVBUS_FALL_EN (1 << 4) +#define USBOTGSS_IRQ_SET_1_DRVVBUS_FALL_EN (1 << 5) +#define USBOTGSS_IRQ_SET_1_IDPULLUP_RISE_EN (1 << 8) +#define USBOTGSS_IRQ_SET_1_DISCHRGVBUS_RISE_EN (1 << 11) +#define USBOTGSS_IRQ_SET_1_CHRGVBUS_RISE_EN (1 << 12) +#define USBOTGSS_IRQ_SET_1_DRVVBUS_RISE_EN (1 << 13) +#define USBOTGSS_IRQ_SET_1_OEVT_EN (1 << 16) +#define USBOTGSS_IRQ_SET_1_DMADISABLECLR_EN (1 << 17) + +#define DWC3_REG_OFFSET 0xc100 + +struct fsl_xhci { + struct xhci_hccr *hcd; + struct dwc3 *dwc3_reg; +}; + +#endif /* _ASM_ARCH_XHCI_FSL_H_ */