diff options
Diffstat (limited to 'drivers/usb/dwc3/dwc3-generic-sti.c')
| -rw-r--r-- | drivers/usb/dwc3/dwc3-generic-sti.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/dwc3-generic-sti.c b/drivers/usb/dwc3/dwc3-generic-sti.c new file mode 100644 index 00000000000..b34f5ceceac --- /dev/null +++ b/drivers/usb/dwc3/dwc3-generic-sti.c @@ -0,0 +1,134 @@ +// SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause +/* + * STi specific glue layer for DWC3 + * + * Copyright (C) 2025, STMicroelectronics - All Rights Reserved + */ + +#define LOG_CATEGORY UCLASS_NOP + +#include <reset.h> +#include <regmap.h> +#include <syscon.h> +#include <asm/io.h> +#include <dm/device.h> +#include <dm/device_compat.h> +#include <dm/read.h> +#include <linux/usb/otg.h> +#include "dwc3-generic.h" + +/* glue registers */ +#define CLKRST_CTRL 0x00 +#define AUX_CLK_EN BIT(0) +#define SW_PIPEW_RESET_N BIT(4) +#define EXT_CFG_RESET_N BIT(8) + +#define XHCI_REVISION BIT(12) + +#define USB2_VBUS_MNGMNT_SEL1 0x2C +#define USB2_VBUS_UTMIOTG 0x1 + +#define SEL_OVERRIDE_VBUSVALID(n) ((n) << 0) +#define SEL_OVERRIDE_POWERPRESENT(n) ((n) << 4) +#define SEL_OVERRIDE_BVALID(n) ((n) << 8) + +/* Static DRD configuration */ +#define USB3_CONTROL_MASK 0xf77 + +#define USB3_DEVICE_NOT_HOST BIT(0) +#define USB3_FORCE_VBUSVALID BIT(1) +#define USB3_DELAY_VBUSVALID BIT(2) +#define USB3_SEL_FORCE_OPMODE BIT(4) +#define USB3_FORCE_OPMODE(n) ((n) << 5) +#define USB3_SEL_FORCE_DPPULLDOWN2 BIT(8) +#define USB3_FORCE_DPPULLDOWN2 BIT(9) +#define USB3_SEL_FORCE_DMPULLDOWN2 BIT(10) +#define USB3_FORCE_DMPULLDOWN2 BIT(11) + +static void dwc3_stih407_glue_configure(struct udevice *dev, int index, + enum usb_dr_mode mode) +{ + struct dwc3_glue_data *glue = dev_get_plat(dev); + struct regmap *regmap; + ulong syscfg_base; + ulong syscfg_offset; + ulong glue_base; + int ret; + + /* deassert both powerdown and softreset */ + ret = reset_deassert_bulk(&glue->resets); + if (ret) { + dev_err(dev, "reset_deassert_bulk error: %d\n", ret); + return; + } + + regmap = syscon_regmap_lookup_by_phandle(dev, "st,syscfg"); + if (IS_ERR(regmap)) { + dev_err(dev, "unable to get st,syscfg, dev %s\n", dev->name); + return; + } + + syscfg_base = regmap->ranges[0].start; + glue_base = dev_read_addr_index(dev, 0); + syscfg_offset = dev_read_addr_index(dev, 1); + + clrbits_le32(syscfg_base + syscfg_offset, USB3_CONTROL_MASK); + + /* glue drd init */ + switch (mode) { + case USB_DR_MODE_PERIPHERAL: + clrbits_le32(syscfg_base + syscfg_offset, + USB3_DELAY_VBUSVALID | USB3_SEL_FORCE_OPMODE | + USB3_FORCE_OPMODE(0x3) | USB3_SEL_FORCE_DPPULLDOWN2 | + USB3_FORCE_DPPULLDOWN2 | USB3_SEL_FORCE_DMPULLDOWN2 | + USB3_FORCE_DMPULLDOWN2); + + setbits_le32(syscfg_base + syscfg_offset, + USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID); + break; + + case USB_DR_MODE_HOST: + clrbits_le32(syscfg_base + syscfg_offset, + USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID | + USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3) | + USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2 | + USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2); + + setbits_le32(syscfg_base + syscfg_offset, USB3_DELAY_VBUSVALID); + break; + + default: + dev_err(dev, "Unsupported mode of operation %d\n", mode); + return; + } + + /* glue init */ + setbits_le32(glue_base + CLKRST_CTRL, AUX_CLK_EN | EXT_CFG_RESET_N | XHCI_REVISION); + clrbits_le32(glue_base + CLKRST_CTRL, SW_PIPEW_RESET_N); + + /* configure mux for vbus, powerpresent and bvalid signals */ + setbits_le32(glue_base + USB2_VBUS_MNGMNT_SEL1, + SEL_OVERRIDE_VBUSVALID(USB2_VBUS_UTMIOTG) | + SEL_OVERRIDE_POWERPRESENT(USB2_VBUS_UTMIOTG) | + SEL_OVERRIDE_BVALID(USB2_VBUS_UTMIOTG)); + setbits_le32(glue_base + CLKRST_CTRL, SW_PIPEW_RESET_N); +}; + +struct dwc3_glue_ops stih407_ops = { + .glue_configure = dwc3_stih407_glue_configure, +}; + +static const struct udevice_id dwc3_sti_match[] = { + { .compatible = "st,stih407-dwc3", .data = (ulong)&stih407_ops}, + { /* sentinel */ } +}; + +U_BOOT_DRIVER(dwc3_sti_wrapper) = { + .name = "dwc3-sti", + .id = UCLASS_NOP, + .of_match = dwc3_sti_match, + .bind = dwc3_glue_bind, + .probe = dwc3_glue_probe, + .remove = dwc3_glue_remove, + .plat_auto = sizeof(struct dwc3_glue_data), +}; |