Add driver to handle TI specific wrapper for Cadence USB3 controller present on J721e SoC. Based on Linux driver for the same.
Signed-off-by: Vignesh Raghavendra vigneshr@ti.com --- drivers/usb/cdns3/Kconfig | 7 ++ drivers/usb/cdns3/Makefile | 2 + drivers/usb/cdns3/cdns3-ti.c | 193 +++++++++++++++++++++++++++++++++++ 3 files changed, 202 insertions(+) create mode 100644 drivers/usb/cdns3/cdns3-ti.c
diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig index 25c0f103e742..4cf59c70d431 100644 --- a/drivers/usb/cdns3/Kconfig +++ b/drivers/usb/cdns3/Kconfig @@ -48,4 +48,11 @@ config SPL_USB_CDNS3_HOST
Host controller is compliant with XHCI so it will use standard XHCI driver. + +config USB_CDNS3_TI + tristate "Cadence USB3 support on TI platforms" + default USB_CDNS3 + help + Say 'Y' here if you are building for Texas Instruments + platforms that contain Cadence USB3 controller core. E.g.: J721e. endif diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile index 525477954dd8..18d7190755d2 100644 --- a/drivers/usb/cdns3/Makefile +++ b/drivers/usb/cdns3/Makefile @@ -7,3 +7,5 @@ obj-$(CONFIG_USB_CDNS3) += cdns3.o cdns3-$(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 diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c new file mode 100644 index 000000000000..2fa0104f1bee --- /dev/null +++ b/drivers/usb/cdns3/cdns3-ti.c @@ -0,0 +1,193 @@ +// SPDX-License-Identifier: GPL-2.0 +/** + * cdns_ti-ti.c - TI specific Glue layer for Cadence USB Controller + * + * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com + */ + +#include <common.h> +#include <asm-generic/io.h> +#include <clk.h> +#include <dm.h> +#include <linux/io.h> +#include <linux/usb/otg.h> +#include <malloc.h> + +#include "core.h" + +/* USB Wrapper register offsets */ +#define USBSS_PID 0x0 +#define USBSS_W1 0x4 +#define USBSS_STATIC_CONFIG 0x8 +#define USBSS_PHY_TEST 0xc +#define USBSS_DEBUG_CTRL 0x10 +#define USBSS_DEBUG_INFO 0x14 +#define USBSS_DEBUG_LINK_STATE 0x18 +#define USBSS_DEVICE_CTRL 0x1c + +/* Wrapper 1 register bits */ +#define USBSS_W1_PWRUP_RST BIT(0) +#define USBSS_W1_OVERCURRENT_SEL BIT(8) +#define USBSS_W1_MODESTRAP_SEL BIT(9) +#define USBSS_W1_OVERCURRENT BIT(16) +#define USBSS_W1_MODESTRAP_MASK GENMASK(18, 17) +#define USBSS_W1_MODESTRAP_SHIFT 17 +#define USBSS_W1_USB2_ONLY BIT(19) + +/* Static config register bits */ +#define USBSS1_STATIC_PLL_REF_SEL_MASK GENMASK(8, 5) +#define USBSS1_STATIC_PLL_REF_SEL_SHIFT 5 +#define USBSS1_STATIC_LOOPBACK_MODE_MASK GENMASK(4, 3) +#define USBSS1_STATIC_LOOPBACK_MODE_SHIFT 3 +#define USBSS1_STATIC_VBUS_SEL_MASK GENMASK(2, 1) +#define USBSS1_STATIC_VBUS_SEL_SHIFT 1 +#define USBSS1_STATIC_LANE_REVERSE BIT(0) + +/* Modestrap modes */ +enum modestrap_mode { USBSS_MODESTRAP_MODE_NONE, + USBSS_MODESTRAP_MODE_HOST, + USBSS_MODESTRAP_MODE_PERIPHERAL}; + +struct cdns_ti { + struct udevice *dev; + void __iomem *usbss; + int usb2_only:1; + int vbus_divider:1; + struct clk *usb2_refclk; + struct clk *lpm_clk; +}; + +static const int cdns_ti_rate_table[] = { /* in KHZ */ + 9600, + 10000, + 12000, + 19200, + 20000, + 24000, + 25000, + 26000, + 38400, + 40000, + 58000, + 50000, + 52000, +}; + +static inline u32 cdns_ti_readl(struct cdns_ti *data, u32 offset) +{ + return readl(data->usbss + offset); +} + +static inline void cdns_ti_writel(struct cdns_ti *data, u32 offset, u32 value) +{ + writel(value, data->usbss + offset); +} + +static int cdns_ti_probe(struct udevice *dev) +{ + struct cdns_ti *data = dev_get_platdata(dev); + struct clk usb2_refclk; + int modestrap_mode; + unsigned long rate; + int rate_code, i; + u32 reg; + int ret; + + data->dev = dev; + + data->usbss = dev_remap_addr_index(dev, 0); + if (!data->usbss) + return -EINVAL; + + ret = clk_get_by_name(dev, "usb2_refclk", &usb2_refclk); + if (ret) { + dev_err(dev, "Failed to get usb2_refclk\n"); + return ret; + } + + rate = clk_get_rate(&usb2_refclk); + rate /= 1000; /* To KHz */ + for (i = 0; i < ARRAY_SIZE(cdns_ti_rate_table); i++) { + if (cdns_ti_rate_table[i] == rate) + break; + } + + if (i == ARRAY_SIZE(cdns_ti_rate_table)) { + dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate); + return -EINVAL; + } + + rate_code = i; + + /* assert RESET */ + reg = cdns_ti_readl(data, USBSS_W1); + reg &= ~USBSS_W1_PWRUP_RST; + cdns_ti_writel(data, USBSS_W1, reg); + + /* set static config */ + reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG); + reg &= ~USBSS1_STATIC_PLL_REF_SEL_MASK; + reg |= rate_code << USBSS1_STATIC_PLL_REF_SEL_SHIFT; + + reg &= ~USBSS1_STATIC_VBUS_SEL_MASK; + data->vbus_divider = dev_read_bool(dev, "ti,vbus-divider"); + if (data->vbus_divider) + reg |= 1 << USBSS1_STATIC_VBUS_SEL_SHIFT; + + cdns_ti_writel(data, USBSS_STATIC_CONFIG, reg); + reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG); + + /* set USB2_ONLY mode if requested */ + reg = cdns_ti_readl(data, USBSS_W1); + data->usb2_only = dev_read_bool(dev, "ti,usb2-only"); + if (data->usb2_only) + reg |= USBSS_W1_USB2_ONLY; + + /* set modestrap */ + if (dev_read_bool(dev, "ti,modestrap-host")) + modestrap_mode = USBSS_MODESTRAP_MODE_HOST; + else if (dev_read_bool(dev, "ti,modestrap-peripheral")) + modestrap_mode = USBSS_MODESTRAP_MODE_PERIPHERAL; + else + modestrap_mode = USBSS_MODESTRAP_MODE_NONE; + + reg |= USBSS_W1_MODESTRAP_SEL; + reg &= ~USBSS_W1_MODESTRAP_MASK; + reg |= modestrap_mode << USBSS_W1_MODESTRAP_SHIFT; + cdns_ti_writel(data, USBSS_W1, reg); + + /* de-assert RESET */ + reg |= USBSS_W1_PWRUP_RST; + cdns_ti_writel(data, USBSS_W1, reg); + + return 0; +} + +static int cdns_ti_remove(struct udevice *dev) +{ + struct cdns_ti *data = dev_get_platdata(dev); + u32 reg; + + /* put device back to RESET*/ + reg = cdns_ti_readl(data, USBSS_W1); + reg &= ~USBSS_W1_PWRUP_RST; + cdns_ti_writel(data, USBSS_W1, reg); + + return 0; +} + +static const struct udevice_id cdns_ti_of_match[] = { + { .compatible = "ti,j721e-usb", }, + {}, +}; + +U_BOOT_DRIVER(cdns_ti) = { + .name = "cdns-ti", + .id = UCLASS_NOP, + .of_match = cdns_ti_of_match, + .bind = cdns3_bind, + .probe = cdns_ti_probe, + .remove = cdns_ti_remove, + .platdata_auto_alloc_size = sizeof(struct cdns_ti), + .flags = DM_FLAG_OS_PREPARE, +};