Add cdns USB3 wrapper driver.
Signed-off-by: Minda Chen minda.chen@starfivetech.com --- drivers/usb/cdns3/Kconfig | 7 ++ drivers/usb/cdns3/Makefile | 2 + drivers/usb/cdns3/cdns3-starfive.c | 183 +++++++++++++++++++++++++++++ 3 files changed, 192 insertions(+) create mode 100644 drivers/usb/cdns3/cdns3-starfive.c
diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig index 35b61497d9..f8f363982b 100644 --- a/drivers/usb/cdns3/Kconfig +++ b/drivers/usb/cdns3/Kconfig @@ -55,4 +55,11 @@ config USB_CDNS3_TI help Say 'Y' here if you are building for Texas Instruments platforms that contain Cadence USB3 controller core. E.g.: J721e. + +config USB_CDNS3_STARFIVE + tristate "Cadence USB3 support on Starfive platforms" + default USB_CDNS3 + help + Say 'Y' here if you are building for Starfive platforms + that contain Cadence USB3 controller core. E.g.: JH7110. endif diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile index 18d7190755..03d1eadb2f 100644 --- a/drivers/usb/cdns3/Makefile +++ b/drivers/usb/cdns3/Makefile @@ -9,3 +9,5 @@ cdns3-$(CONFIG_$(SPL_)USB_CDNS3_GADGET) += gadget.o ep0.o cdns3-$(CONFIG_$(SPL_)USB_CDNS3_HOST) += host.o
obj-$(CONFIG_USB_CDNS3_TI) += cdns3-ti.o + +obj-$(CONFIG_USB_CDNS3_STARFIVE) += cdns3-starfive.o diff --git a/drivers/usb/cdns3/cdns3-starfive.c b/drivers/usb/cdns3/cdns3-starfive.c new file mode 100644 index 0000000000..660833fb5b --- /dev/null +++ b/drivers/usb/cdns3/cdns3-starfive.c @@ -0,0 +1,183 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * cdns3-starfive.c - StarFive specific Glue layer for Cadence USB Controller + * + * Copyright (C) 2024 StarFive Technology Co., Ltd. + * + * Author: Minda Chen minda.chen@starfivetech.com + */ + +#include <asm/io.h> +#include <clk.h> +#include <dm.h> +#include <dm/device_compat.h> +#include <linux/bitops.h> +#include <linux/usb/otg.h> +#include <reset.h> +#include <regmap.h> +#include <syscon.h> +#include <malloc.h> + +#include "core.h" + +#define USB_STRAP_HOST BIT(17) +#define USB_STRAP_DEVICE BIT(18) +#define USB_STRAP_MASK GENMASK(18, 16) + +#define USB_SUSPENDM_HOST BIT(19) +#define USB_SUSPENDM_MASK BIT(19) + +#define USB_MISC_CFG_MASK GENMASK(23, 20) +#define USB_SUSPENDM_BYPS BIT(20) +#define USB_PLL_EN BIT(22) +#define USB_REFCLK_MODE BIT(23) + +struct cdns_starfive { + struct udevice *dev; + struct regmap *stg_syscon; + struct reset_ctl_bulk resets; + struct clk_bulk clks; + u32 stg_usb_mode; + enum usb_dr_mode mode; +}; + +static void cdns_mode_init(struct cdns_starfive *data, enum usb_dr_mode mode) +{ + unsigned int strap, suspendm; + + regmap_update_bits(data->stg_syscon, data->stg_usb_mode, + USB_MISC_CFG_MASK, + USB_SUSPENDM_BYPS | USB_PLL_EN | USB_REFCLK_MODE); + + switch (mode) { + case USB_DR_MODE_HOST: + strap = USB_STRAP_HOST; + suspendm = USB_SUSPENDM_HOST; + break; + + case USB_DR_MODE_PERIPHERAL: + strap = USB_STRAP_DEVICE; + suspendm = 0; + break; + default: + return; + } + + regmap_update_bits(data->stg_syscon, data->stg_usb_mode, + USB_STRAP_MASK, strap); + regmap_update_bits(data->stg_syscon, data->stg_usb_mode, + USB_SUSPENDM_MASK, suspendm); +} + +static void cdns_clk_rst_deinit(struct cdns_starfive *data) +{ + reset_assert_bulk(&data->resets); + clk_disable_bulk(&data->clks); +} + +static int cdns_clk_rst_init(struct cdns_starfive *data) +{ + int ret; + + ret = clk_get_bulk(data->dev, &data->clks); + if (ret) + return ret; + + ret = reset_get_bulk(data->dev, &data->resets); + if (ret) + goto err_clk; + + ret = clk_enable_bulk(&data->clks); + if (ret) + goto err_en_clk; + + ret = reset_deassert_bulk(&data->resets); + if (ret) + goto err_reset; + + return 0; + +err_reset: + clk_disable_bulk(&data->clks); +err_en_clk: + reset_release_bulk(&data->resets); +err_clk: + clk_release_bulk(&data->clks); + + return ret; +} + +static int cdns_starfive_get_syscon(struct cdns_starfive *data) +{ + struct ofnode_phandle_args phandle; + int ret; + + ret = dev_read_phandle_with_args(data->dev, "starfive,stg-syscon", NULL, 1, 0, + &phandle); + + if (ret < 0) { + dev_err(data->dev, "Can't get stg cfg phandle: %d\n", ret); + return ret; + } + + data->stg_syscon = syscon_node_to_regmap(phandle.node); + if (IS_ERR(data->stg_syscon)) { + dev_err(data->dev, "fail to get regmap: %d\n", (int)PTR_ERR(data->stg_syscon)); + return PTR_ERR(data->stg_syscon); + } + data->stg_usb_mode = phandle.args[0]; + + return 0; +} + +static int cdns_starfive_probe(struct udevice *dev) +{ + struct cdns_starfive *data = dev_get_plat(dev); + enum usb_dr_mode dr_mode; + ofnode node; + int ret; + + data->dev = dev; + + ret = cdns_starfive_get_syscon(data); + + if (ret) + return ret; + + node = ofnode_by_compatible(dev_ofnode(dev), "cdns,usb3"); + if (!ofnode_valid(node)) { + dev_err(dev, "failed to get usb node\n"); + return -ENODEV; + } + + dr_mode = usb_get_dr_mode(node); + + data->mode = dr_mode; + cdns_mode_init(data, dr_mode); + + return cdns_clk_rst_init(data); +} + +static int cdns_starfive_remove(struct udevice *dev) +{ + struct cdns_starfive *data = dev_get_plat(dev); + + cdns_clk_rst_deinit(data); + return 0; +} + +static const struct udevice_id cdns_starfive_of_match[] = { + { .compatible = "starfive,jh7110-usb", }, + {}, +}; + +U_BOOT_DRIVER(cdns_starfive) = { + .name = "cdns-starfive", + .id = UCLASS_NOP, + .of_match = cdns_starfive_of_match, + .bind = cdns3_bind, + .probe = cdns_starfive_probe, + .remove = cdns_starfive_remove, + .plat_auto = sizeof(struct cdns_starfive), + .flags = DM_FLAG_OS_PREPARE, +};