[PATCH 4/5] usb: xhci: Add Qualcomm DWC3 xHCI driver
Tom Rini
trini at konsulko.com
Wed Aug 19 20:22:54 CEST 2020
On Mon, Aug 17, 2020 at 12:36:05PM +0200, Robert Marko wrote:
> Add driver for Qualcomm DWC3 based dual role xHCI USB controller.
> Currently tested on IPQ40xx, but should support other Qualcomm SoC families as well.
>
> Signed-off-by: Robert Marko <robert.marko at sartura.hr>
> ---
> MAINTAINERS | 2 +
> .../usb/qcom-dwc3-ipq.txt | 25 +++
> drivers/usb/host/Kconfig | 6 +
> drivers/usb/host/Makefile | 1 +
> drivers/usb/host/xhci-ipq.c | 193 ++++++++++++++++++
> 5 files changed, 227 insertions(+)
> create mode 100644 doc/device-tree-bindings/usb/qcom-dwc3-ipq.txt
> create mode 100644 drivers/usb/host/xhci-ipq.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 1a55327406..0e4e281d9b 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -239,6 +239,8 @@ S: Maintained
> F: arch/arm/mach-ipq40xx/
> F: include/dt-bindings/reset/qcom,ipq40xx-reset.h
> F: drivers/reset/reset-ipq40xx.c
> +F: doc/device-tree-bindings/usb/qcom-dwc3-ipq.txt
> +F: drivers/usb/host/xhci-ipq.c
>
> ARM MARVELL KIRKWOOD ARMADA-XP ARMADA-38X ARMADA-37XX ARMADA-7K/8K
> M: Stefan Roese <sr at denx.de>
> diff --git a/doc/device-tree-bindings/usb/qcom-dwc3-ipq.txt b/doc/device-tree-bindings/usb/qcom-dwc3-ipq.txt
> new file mode 100644
> index 0000000000..591683e520
> --- /dev/null
> +++ b/doc/device-tree-bindings/usb/qcom-dwc3-ipq.txt
> @@ -0,0 +1,25 @@
> +Qualcomm SuperSpeed DWC3 USB SoC controller
> +
> +This controller is integrated in IPQ40xx SoC-s.
> +It is a dual role USB3.0/USB2.0 controller.
> +
> +Required properties :
> + - compatible: must be "qcom,dwc3-ipq"
> + - reg: should contain address and length of the standard XHCI
> + register set for the device.
> +
> +Optional properties:
> + - rst-ctrl: Magic value used to reset PHY-s properly
> + (PHY-s may not function properly without it)
> + - hs-only : If present, specifies that board only has USB2.0(HS)
> + port
> +
> +Example:
> + xhci at 8a00000 {
> + compatible = "qcom,dwc3-ipq";
> + #address-cells = <1>;
> + #size-cells = <1>;
> + reg = <0x8a00000 0xcd00>;
> + rst-ctrl = <0x181E038 0x4>;
> + status = "disabled";
> + };
> diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
> index 1c374a7bd8..320c77ead5 100644
> --- a/drivers/usb/host/Kconfig
> +++ b/drivers/usb/host/Kconfig
> @@ -93,6 +93,12 @@ config USB_XHCI_BRCM
> USB controller based on the Broadcom USB3 IP Core.
> Supports USB2/3 functionality.
>
> +config USB_XHCI_IPQ
> + bool "Support for Qualcomm IPQ on-chip DWC3 xHCI USB controller"
> + depends on DM_USB && USB_XHCI_DWC3 && ARCH_IPQ40XX
> + help
> + Enables support for the on-chip xHCI DWC3 controller on Qualcomm IPQ SoCs.
> +
> endif # USB_XHCI_HCD
>
> config USB_EHCI_HCD
> diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
> index 29d4f87e38..0fa9c8f32a 100644
> --- a/drivers/usb/host/Makefile
> +++ b/drivers/usb/host/Makefile
> @@ -55,6 +55,7 @@ obj-$(CONFIG_USB_XHCI_MVEBU) += xhci-mvebu.o
> obj-$(CONFIG_USB_XHCI_OMAP) += xhci-omap.o
> obj-$(CONFIG_USB_XHCI_PCI) += xhci-pci.o
> obj-$(CONFIG_USB_XHCI_RCAR) += xhci-rcar.o
> +obj-$(CONFIG_USB_XHCI_IPQ) += xhci-ipq.o
> obj-$(CONFIG_USB_XHCI_STI) += dwc3-sti-glue.o
>
> # designware
> diff --git a/drivers/usb/host/xhci-ipq.c b/drivers/usb/host/xhci-ipq.c
> new file mode 100644
> index 0000000000..b550cafac2
> --- /dev/null
> +++ b/drivers/usb/host/xhci-ipq.c
> @@ -0,0 +1,193 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2015 Freescale Semiconductor, Inc.
> + * Copyright (c) 2020 Sartura Ltd.
> + *
> + * DWC3 controller driver
> + *
> + * Author: Ramneek Mehresh<ramneek.mehresh at freescale.com>
> + * Author: Robert Marko <robert.marko at sartura.hr>
> + *
> + */
> +
> +#include <common.h>
> +#include <dm.h>
> +#include <usb.h>
> +#include <linux/compat.h>
> +#include <linux/errno.h>
> +#include <linux/delay.h>
> +#include <linux/usb/dwc3.h>
> +#include <usb/xhci.h>
> +
> +/* Declare global data pointer */
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +struct ipq_xhci_platdata {
> + fdt_addr_t hcd_base;
> + unsigned int rst_ctrl;
> + unsigned int hs_only;
> +};
> +
> +struct ipq_xhci {
> + struct ipq_xhci_platdata usb_plat;
> + struct xhci_ctrl ctrl;
> + struct udevice* dev;
> + struct xhci_hccr *hcd;
> + struct dwc3 *dwc3_reg;
> +};
> +
> +void ipq_reset_usb_phy(void *data)
> +{
> + unsigned int gcc_rst_ctrl;
> + struct ipq_xhci_platdata *platdata;
> + struct ipq_xhci *ipq = (struct ipq_xhci *)data;
> +
> + platdata = dev_get_platdata(ipq->dev);
> + if (platdata == NULL) {
> + printf("Error: %s Failed\n", __func__);
> + return;
> + }
> +
> + gcc_rst_ctrl = platdata->rst_ctrl;
> +
> + if (gcc_rst_ctrl) {
> + /* assert HS PHY POR reset */
> + setbits_le32(gcc_rst_ctrl, 0x10);
> + mdelay(10);
> +
> + /* assert HS PHY SRIF reset */
> + setbits_le32(gcc_rst_ctrl, 0x4);
> + mdelay(10);
> +
> + /* deassert HS PHY SRIF reset and program HS PHY registers */
> + clrbits_le32(gcc_rst_ctrl, 0x4);
> + mdelay(10);
> +
> + /* de-assert USB3 HS PHY POR reset */
> + clrbits_le32(gcc_rst_ctrl, 0x10);
> + mdelay(10);
> +
> + if (!platdata->hs_only) {
> + /* assert SS PHY POR reset */
> + setbits_le32(gcc_rst_ctrl, 0x20);
> + mdelay(10);
> +
> + /* deassert SS PHY POR reset */
> + clrbits_le32(gcc_rst_ctrl, 0x20);
> + }
> + }
> +}
> +
> +static int ipq_xhci_core_init(struct ipq_xhci *ipq)
> +{
> + int ret = 0;
> +
> + ipq_reset_usb_phy((void *)ipq);
> +
> + ret = dwc3_core_init(ipq->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(ipq->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
> +
> + return ret;
> +}
> +
> +static void ipq_xhci_core_exit(struct ipq_xhci *ipq)
> +{
> +
> +}
> +
> +static int xhci_usb_remove(struct udevice *dev)
> +{
> + int ret;
> + ret = xhci_deregister(dev);
> +
> + if (ret != 0) {
> + debug("%s:xhci deregistration failed\n", __func__);
> + return ret;
> + }
> +
> + ipq_xhci_core_exit(dev_get_priv(dev));
> +
> + return 0;
> +}
> +
> +static int xhci_usb_probe(struct udevice *dev)
> +{
> + struct ipq_xhci *context;
> + struct ipq_xhci_platdata *platdata;
> + struct xhci_hcor *hcor;
> + int ret;
> +
> + platdata = dev_get_platdata(dev);
> + if (platdata == NULL) {
> + printf("Error: %s Failed\n", __func__);
> + return -ENODEV;
> + }
> +
> + context = dev_get_priv(dev);
> + if (context == NULL) {
> + printf("Error: %s Failed\n", __func__);
> + return -ENODEV;
> + }
> +
> + context->hcd = (struct xhci_hccr *)platdata->hcd_base;
> + context->dev = dev;
> + context->dwc3_reg = (struct dwc3 *)((char *)(context->hcd) + DWC3_REG_OFFSET);
> + hcor = (struct xhci_hcor *)((uint32_t)context->hcd +
> + HC_LENGTH(xhci_readl(&context->hcd->cr_capbase)));
> +
> + ret = ipq_xhci_core_init(context);
> +
> + if (ret) {
> + puts("Error initializing the XHCI controller\n");
> + return -EINVAL;
> + }
> +
> + return xhci_register(dev, context->hcd, hcor);
> +}
> +
> +static int xhci_ofdata_to_platdata(struct udevice *dev)
> +{
> + struct ipq_xhci_platdata *platdata;
> + const void *blob = gd->fdt_blob;
> +
> + platdata = dev_get_platdata(dev);
> + if (platdata == NULL) {
> + printf("Error: %s Failed\n", __func__);
> + return -ENODEV;
> + }
> +
> + platdata->hcd_base = devfdt_get_addr(dev);
> + if (platdata->hcd_base == FDT_ADDR_T_NONE) {
> + debug("Error getting DWC3 base address\n");
> + return -ENXIO;
> + }
> +
> + platdata->rst_ctrl = fdtdec_get_int(blob, dev_of_offset(dev), "rst-ctrl", 0);
> + platdata->hs_only = fdtdec_get_int(blob, dev_of_offset(dev), "hs-only", 0);
> +
> + return 0;
> +}
> +
> +static const struct udevice_id xhci_match_ids[] = {
> + { .compatible = "qcom,dwc3-ipq" },
> + {}
> +};
> +
> +U_BOOT_DRIVER(usb_xhci) = {
> + .name = "xhci_ipq",
> + .id = UCLASS_USB,
> + .of_match = xhci_match_ids,
> + .ofdata_to_platdata = xhci_ofdata_to_platdata,
> + .probe = xhci_usb_probe,
> + .remove = xhci_usb_remove,
> + .ops = &xhci_usb_ops,
> + .platdata_auto_alloc_size = sizeof(struct ipq_xhci_platdata),
> + .priv_auto_alloc_size = sizeof(struct ipq_xhci),
> + .flags = DM_FLAG_ALLOC_PRIV_DMA,
> +};
Adding USB maintainer.
--
Tom
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