Add support for AM62 USB wrapper for DWC3 Controller in AM62 SoC.

Signed-off-by: Aswath Govindraju a-govindraju@ti.com ---

Link to corresponding kernel dt-bindings and driver patches, - https://patchwork.kernel.org/project/linux-usb/list/?series=629613

drivers/usb/dwc3/Kconfig | 7 + drivers/usb/dwc3/Makefile | 1 + drivers/usb/dwc3/dwc3-am62.c | 284 +++++++++++++++++++++++++++++++++++ 3 files changed, 292 insertions(+) create mode 100644 drivers/usb/dwc3/dwc3-am62.c

diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig index 62aa65bf0cd2..87e19720ab84 100644 --- a/drivers/usb/dwc3/Kconfig +++ b/drivers/usb/dwc3/Kconfig @@ -63,6 +63,13 @@ config USB_DWC3_LAYERSCAPE Host and Peripheral operation modes are supported. OTG is not supported.

+config USB_DWC3_AM62 + tristate "Texas Instruments AM62 Platforms" + depends on ARCH_K3 || COMPILE_TEST + default USB_DWC3 + help + Support of USB2 functionality in TI's AM62 platforms + menu "PHY Subsystem"

config USB_DWC3_PHY_OMAP diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile index 0dd1ba87cd94..26bc3a7379b7 100644 --- a/drivers/usb/dwc3/Makefile +++ b/drivers/usb/dwc3/Makefile @@ -7,6 +7,7 @@ dwc3-y := core.o obj-$(CONFIG_USB_DWC3_GADGET) += gadget.o ep0.o

obj-$(CONFIG_USB_DWC3_OMAP) += dwc3-omap.o +obj-$(CONFIG_USB_DWC3_AM62) += dwc3-am62.o obj-$(CONFIG_USB_DWC3_MESON_G12A) += dwc3-meson-g12a.o obj-$(CONFIG_USB_DWC3_MESON_GXL) += dwc3-meson-gxl.o obj-$(CONFIG_USB_DWC3_GENERIC) += dwc3-generic.o diff --git a/drivers/usb/dwc3/dwc3-am62.c b/drivers/usb/dwc3/dwc3-am62.c new file mode 100644 index 000000000000..a3ad609036e2 --- /dev/null +++ b/drivers/usb/dwc3/dwc3-am62.c @@ -0,0 +1,284 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * dwc3-am62.c - TI specific Glue layer for AM62 DWC3 USB Controller + * + * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com + */ + +#include <common.h> +#include <asm-generic/io.h> +#include <clk.h> +#include <dm.h> +#include <dm/device_compat.h> +#include <linux/bitops.h> +#include <linux/io.h> +#include <syscon.h> +#include <malloc.h> +#include <usb.h> +#include <usb/xhci.h> +#include <linux/usb/ch9.h> +#include <linux/usb/gadget.h> +#include <regmap.h> +#include <linux/usb/otg.h> +#include <dm/lists.h> + +/* USB WRAPPER register offsets */ +#define USBSS_PID 0x0 +#define USBSS_OVERCURRENT_CTRL 0x4 +#define USBSS_PHY_CONFIG 0x8 +#define USBSS_PHY_TEST 0xc +#define USBSS_CORE_STAT 0x14 +#define USBSS_HOST_VBUS_CTRL 0x18 +#define USBSS_MODE_CONTROL 0x1c +#define USBSS_WAKEUP_CONFIG 0x30 +#define USBSS_WAKEUP_STAT 0x34 +#define USBSS_OVERRIDE_CONFIG 0x38 +#define USBSS_IRQ_MISC_STATUS_RAW 0x430 +#define USBSS_IRQ_MISC_STATUS 0x434 +#define USBSS_IRQ_MISC_ENABLE_SET 0x438 +#define USBSS_IRQ_MISC_ENABLE_CLR 0x43c +#define USBSS_IRQ_MISC_EOI 0x440 +#define USBSS_INTR_TEST 0x490 +#define USBSS_VBUS_FILTER 0x614 +#define USBSS_VBUS_STAT 0x618 +#define USBSS_DEBUG_CFG 0x708 +#define USBSS_DEBUG_DATA 0x70c +#define USBSS_HOST_HUB_CTRL 0x714 + +/* PHY CONFIG register bits */ +#define USBSS_PHY_VBUS_SEL_MASK GENMASK(2, 1) +#define USBSS_PHY_VBUS_SEL_SHIFT 1 +#define USBSS_PHY_LANE_REVERSE BIT(0) + +/* MODE CONTROL register bits */ +#define USBSS_MODE_VALID BIT(0) + +/* IRQ_MISC_STATUS_RAW register bits */ +#define USBSS_IRQ_MISC_RAW_VBUSVALID BIT(22) +#define USBSS_IRQ_MISC_RAW_SESSVALID BIT(20) + +/* IRQ_MISC_STATUS register bits */ +#define USBSS_IRQ_MISC_VBUSVALID BIT(22) +#define USBSS_IRQ_MISC_SESSVALID BIT(20) + +/* IRQ_MISC_ENABLE_SET register bits */ +#define USBSS_IRQ_MISC_ENABLE_SET_VBUSVALID BIT(22) +#define USBSS_IRQ_MISC_ENABLE_SET_SESSVALID BIT(20) + +/* IRQ_MISC_ENABLE_CLR register bits */ +#define USBSS_IRQ_MISC_ENABLE_CLR_VBUSVALID BIT(22) +#define USBSS_IRQ_MISC_ENABLE_CLR_SESSVALID BIT(20) + +/* VBUS_STAT register bits */ +#define USBSS_VBUS_STAT_SESSVALID BIT(2) +#define USBSS_VBUS_STAT_VBUSVALID BIT(0) + +/* Mask for PHY PLL REFCLK */ +#define PHY_PLL_REFCLK_MASK GENMASK(3, 0) + +struct dwc3_data { + struct udevice *dev; + void __iomem *usbss; + struct regmap *syscon; + unsigned int offset; + unsigned int vbus_divider; +}; + +static inline u32 dwc3_ti_readl(struct dwc3_data *data, u32 offset) +{ + return readl(data->usbss + offset); +} + +static inline void dwc3_ti_writel(struct dwc3_data *data, u32 offset, u32 value) +{ + writel(value, data->usbss + offset); +} + +static const int dwc3_ti_rate_table[] = { /* in KHZ */ + 9600, + 10000, + 12000, + 19200, + 20000, + 24000, + 25000, + 26000, + 38400, + 40000, + 58000, + 50000, + 52000, +}; + +static int phy_syscon_pll_refclk(struct dwc3_data *data, int rate_code) +{ + struct udevice *dev = data->dev; + struct ofnode_phandle_args args; + ofnode node = dev_ofnode(dev); + struct regmap *syscon; + int ret; + + syscon = syscon_regmap_lookup_by_phandle(dev, "ti,syscon-phy-pll-refclk"); + if (IS_ERR(syscon)) { + dev_err(dev, "unable to get ti,syscon-phy-pll-refclk regmap\n"); + return PTR_ERR(syscon); + } + + data->syscon = syscon; + + ret = ofnode_parse_phandle_with_args(node, "ti,syscon-phy-pll-refclk", NULL, 1, + 0, &args); + if (ret) + return ret; + + data->offset = args.args[0]; + + /* Program PHY PLL refclk by reading syscon property */ + ret = regmap_update_bits(data->syscon, data->offset, PHY_PLL_REFCLK_MASK, rate_code); + if (ret) { + dev_err(dev, "failed to set phy pll reference clock rate\n"); + return ret; + } + + return 0; +} + +static int dwc3_ti_bind(struct udevice *parent) +{ + ofnode node; + const char *name = ofnode_get_name(node); + enum usb_dr_mode dr_mode; + struct udevice *dev; + const char *driver = NULL; + int ret; + + node = ofnode_by_compatible(dev_ofnode(parent), "snps,dwc3"); + if (!ofnode_valid(node)) { + ret = -ENODEV; + return 0; + } + + name = ofnode_get_name(node); + dr_mode = usb_get_dr_mode(node); + debug("%s: subnode name: %s\n", __func__, name); + + switch (dr_mode) { + case USB_DR_MODE_PERIPHERAL: + case USB_DR_MODE_OTG: +#if CONFIG_IS_ENABLED(DM_USB_GADGET) + debug("%s: dr_mode: OTG or Peripheral\n", __func__); + driver = "dwc3-generic-peripheral"; +#endif + break; +#if defined(CONFIG_SPL_USB_HOST) || !defined(CONFIG_SPL_BUILD) + case USB_DR_MODE_HOST: + debug("%s: dr_mode: HOST\n", __func__); + driver = "dwc3-generic-host"; + break; +#endif + default: + debug("%s: unsupported dr_mode\n", __func__); + return -ENODEV; + }; + + if (!driver) + return 0; + + ret = device_bind_driver_to_node(parent, driver, name, + node, &dev); + if (ret) { + debug("%s: not able to bind usb device mode\n", + __func__); + return ret; + } + + return 0; +} + +static int dwc3_ti_probe(struct udevice *dev) +{ + struct dwc3_data *data = dev_get_plat(dev); + struct clk usb2_refclk; + int rate_code, i, ret; + unsigned long rate; + u32 reg; + + data->dev = dev; + + data->usbss = dev_remap_addr_index(dev, 0); + if (IS_ERR(data->usbss)) { + dev_err(dev, "can't map IOMEM resource\n"); + return PTR_ERR(data->usbss); + } + + ret = clk_get_by_name(dev, "ref", &usb2_refclk); + if (ret) { + dev_err(dev, "can't get usb2_refclk\n"); + return ret; + } + + /* Calcuate the rate code */ + rate = clk_get_rate(&usb2_refclk); + rate /= 1000; /* To KHz */ + for (i = 0; i < ARRAY_SIZE(dwc3_ti_rate_table); i++) { + if (dwc3_ti_rate_table[i] == rate) + break; + } + + if (i == ARRAY_SIZE(dwc3_ti_rate_table)) { + dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate); + return -EINVAL; + } + + rate_code = i; + + /* Read the syscon property */ + ret = phy_syscon_pll_refclk(data, rate_code); + if (ret) + return ret; + + /* VBUS divider select */ + reg = dwc3_ti_readl(data, USBSS_PHY_CONFIG); + data->vbus_divider = dev_read_bool(dev, "ti,vbus-divider"); + if (data->vbus_divider) + reg |= 1 << USBSS_PHY_VBUS_SEL_SHIFT; + + dwc3_ti_writel(data, USBSS_PHY_CONFIG, reg); + + /* Set mode valid */ + reg = dwc3_ti_readl(data, USBSS_MODE_CONTROL); + reg |= USBSS_MODE_VALID; + dwc3_ti_writel(data, USBSS_MODE_CONTROL, reg); + + return 0; +} + +/* work queue not required to cancel separately as auto cancel API was used*/ +static int dwc3_ti_remove(struct udevice *dev) +{ + struct dwc3_data *data = dev_get_plat(dev); + u32 reg; + + /* Clear mode valid */ + reg = dwc3_ti_readl(data, USBSS_MODE_CONTROL); + reg &= ~USBSS_MODE_VALID; + dwc3_ti_writel(data, USBSS_MODE_CONTROL, reg); + + return 0; +} + +static const struct udevice_id dwc3_ti_of_match[] = { + { .compatible = "ti,am62-usb", }, + {}, +}; + +U_BOOT_DRIVER(dwc3_ti) = { + .name = "dwc3-ti", + .id = UCLASS_NOP, + .of_match = dwc3_ti_of_match, + .bind = dwc3_ti_bind, + .probe = dwc3_ti_probe, + .remove = dwc3_ti_remove, + .plat_auto = sizeof(struct dwc3_data), + .flags = DM_FLAG_OS_PREPARE, +};