From ca7fdc8b1267ad0189060c853502761086c8d74a Mon Sep 17 00:00:00 2001 From: Neil Armstrong Date: Wed, 11 Apr 2018 17:08:00 +0200 Subject: [PATCH] usb: host: Add simple of glue driver for DWC3 USB Controllers integration This is a port of the dwc3-of-simple driver from Linux to enable/deassert clock and resets of a simple DWC3 Controller HW glue. Signed-off-by: Neil Armstrong --- drivers/usb/host/Kconfig | 7 ++ drivers/usb/host/Makefile | 1 + drivers/usb/host/dwc3-of-simple.c | 109 ++++++++++++++++++++++++++++++ 3 files changed, 117 insertions(+) create mode 100644 drivers/usb/host/dwc3-of-simple.c diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig index a7249b7511..6caa61552a 100644 --- a/drivers/usb/host/Kconfig +++ b/drivers/usb/host/Kconfig @@ -21,6 +21,13 @@ config USB_XHCI_DWC3 Say Y or if your system has a Dual Role SuperSpeed USB controller based on the DesignWare USB3 IP Core. +config USB_XHCI_DWC3_OF_SIMPLE + bool "DesignWare USB3 DRD Generic OF Simple Glue Layer" + select MISC + help + Support USB2/3 functionality in simple SoC integrations with + USB controller based on the DesignWare USB3 IP Core. + config USB_XHCI_MVEBU bool "MVEBU USB 3.0 support" default y diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile index 98194893b9..abe4f9087f 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_HCD) += xhci.o xhci-mem.o xhci-ring.o obj-$(CONFIG_USB_XHCI_DWC3) += xhci-dwc3.o +obj-$(CONFIG_USB_XHCI_DWC3_OF_SIMPLE) += dwc3-of-simple.o obj-$(CONFIG_USB_XHCI_ROCKCHIP) += xhci-rockchip.o obj-$(CONFIG_USB_XHCI_ZYNQMP) += xhci-zynqmp.o obj-$(CONFIG_USB_XHCI_KEYSTONE) += xhci-keystone.o diff --git a/drivers/usb/host/dwc3-of-simple.c b/drivers/usb/host/dwc3-of-simple.c new file mode 100644 index 0000000000..54a5f60b52 --- /dev/null +++ b/drivers/usb/host/dwc3-of-simple.c @@ -0,0 +1,109 @@ +/* + * dwc3-of-simple.c - OF glue layer for simple integrations + * + * Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com + * + * Author: Felipe Balbi + * + * Copyright (C) 2018 BayLibre, SAS + * Author: Neil Armstrong + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include +#include + +DECLARE_GLOBAL_DATA_PTR; + +struct dwc3_of_simple { + struct clk_bulk clks; + struct reset_ctl_bulk resets; +}; + +static int dwc3_of_simple_reset_init(struct udevice *dev, + struct dwc3_of_simple *simple) +{ + int ret; + + ret = reset_get_bulk(dev, &simple->resets); + if (ret == -ENOTSUPP) + return 0; + else if (ret) + return ret; + + ret = reset_deassert_bulk(&simple->resets); + if (ret) { + reset_release_bulk(&simple->resets); + return ret; + } + + return 0; +} + +static int dwc3_of_simple_clk_init(struct udevice *dev, + struct dwc3_of_simple *simple) +{ + int ret; + + ret = clk_get_bulk(dev, &simple->clks); + if (ret == -ENOTSUPP) + return 0; + if (ret) + return ret; + +#if CONFIG_IS_ENABLED(CLK) + ret = clk_enable_bulk(&simple->clks); + if (ret) { + clk_release_bulk(&simple->clks); + return ret; + } +#endif + + return 0; +} + +static int dwc3_of_simple_probe(struct udevice *dev) +{ + struct dwc3_of_simple *simple = dev_get_platdata(dev); + int ret; + + ret = dwc3_of_simple_clk_init(dev, simple); + if (ret) + return ret; + + ret = dwc3_of_simple_reset_init(dev, simple); + if (ret) + return ret; + + return 0; +} + +static int dwc3_of_simple_remove(struct udevice *dev) +{ + struct dwc3_of_simple *simple = dev_get_platdata(dev); + + reset_release_bulk(&simple->resets); + + clk_release_bulk(&simple->clks); + + return dm_scan_fdt_dev(dev); +} + +static const struct udevice_id dwc3_of_simple_ids[] = { + { .compatible = "amlogic,meson-gxl-dwc3" }, + { } +}; + +U_BOOT_DRIVER(dwc3_of_simple) = { + .name = "dwc3-of-simple", + .id = UCLASS_SIMPLE_BUS, + .of_match = dwc3_of_simple_ids, + .probe = dwc3_of_simple_probe, + .remove = dwc3_of_simple_remove, + .platdata_auto_alloc_size = sizeof(struct dwc3_of_simple), + .flags = DM_FLAG_ALLOC_PRIV_DMA, +}; -- 2.25.1