Add STi glue logic to manage the DWC3 HC on STiH407
SoC family. It configures the internal glue logic and
syscfg registers.
Signed-off-by: Patrice Chotard <patrice.chot...@foss.st.com>
Cc: Marek Vasut <ma...@denx.de>
---
Changes in v5:
- reorder files entry for ARM STI in MAINTAINERS file
- add #define LOG_CATEGORY UCLASS_NOP
- use UCLASS_NOP instead of UCLASS_SIMPLE_BUS
Changes in v4:
- Update Kconfig description
Changes in v3:
- Replace debug() by dev_err()
- check return value of syscon_regmap_lookup_by_phandle()
Changes in v2:
- add dwc3-sti.c DWC3 wrapper as done for dwc3-am62.c
MAINTAINERS | 1 +
drivers/usb/dwc3/Kconfig | 8 ++
drivers/usb/dwc3/Makefile | 1 +
drivers/usb/dwc3/dwc3-generic-sti.c | 134 ++++++++++++++++++++++++++++
4 files changed, 144 insertions(+)
create mode 100644 drivers/usb/dwc3/dwc3-generic-sti.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 0e93f88c2aa..38501775890 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -657,6 +657,7 @@ F: drivers/reset/sti-reset.c
F: drivers/serial/serial_sti_asc.c
F: drivers/sysreset/sysreset_sti.c
F: drivers/timer/arm_global_timer.c
+F: drivers/usb/host/dwc3-sti.c
F: include/dt-bindings/clock/stih407-clks.h
F: include/dt-bindings/clock/stih410-clks.h
F: include/dt-bindings/reset/stih407-resets.h
diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 0100723a68b..682a6910655 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -87,6 +87,14 @@ config USB_DWC3_LAYERSCAPE
Host and Peripheral operation modes are supported. OTG is not
supported.
+config USB_DWC3_STI
+ bool "STi USB wrapper"
+ depends on DM_USB && USB_DWC3_GENERIC && SYSCON
+ help
+ Enables support for the on-chip xHCI controller on STMicroelectronics
+ STiH407 family SoCs. This is a driver for the dwc3 to provide the
+ glue logic to configure the controller.
+
menu "PHY Subsystem"
config USB_DWC3_PHY_OMAP
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index a085c9d4628..985206eafe4 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -15,3 +15,4 @@ obj-$(CONFIG_USB_DWC3_UNIPHIER) +=
dwc3-uniphier.o
obj-$(CONFIG_USB_DWC3_LAYERSCAPE) += dwc3-layerscape.o
obj-$(CONFIG_USB_DWC3_PHY_OMAP) += ti_usb_phy.o
obj-$(CONFIG_USB_DWC3_PHY_SAMSUNG) += samsung_usb_phy.o
+obj-$(CONFIG_USB_DWC3_STI) += dwc3-generic-sti.o
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),
+};
--
2.25.1
