Adds TH1520 Glue layer to support USB controller on T-HEAD TH1520 SoC.
There is a DesignWare USB3 DRD core in TH1520 SoCs, the dwc3 core is
the child of this USB wrapper module device.
Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx>
---
MAINTAINERS | 1 +
drivers/usb/dwc3/Kconfig | 9 +++
drivers/usb/dwc3/Makefile | 1 +
drivers/usb/dwc3/dwc3-thead.c | 119 ++++++++++++++++++++++++++++++++++
4 files changed, 130 insertions(+)
create mode 100644 drivers/usb/dwc3/dwc3-thead.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 90f13281d297..d55e40060c46 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18481,6 +18481,7 @@ M: Fu Wei <wefu@xxxxxxxxxx>
L: linux-riscv@xxxxxxxxxxxxxxxxxxx
S: Maintained
F: arch/riscv/boot/dts/thead/
+F: drivers/usb/dwc3/dwc3-thead.c
RNBD BLOCK DRIVERS
M: Md. Haris Iqbal <haris.iqbal@xxxxxxxxx>
diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 98efcbb76c88..1b02f4f55b47 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -178,4 +178,13 @@ config USB_DWC3_OCTEON
Only the host mode is currently supported.
Say 'Y' or 'M' here if you have one such device.
+config USB_DWC3_THEAD
+ tristate "T-HEAD Platform"
+ depends on ARCH_THEAD || COMPILE_TEST
+ default USB_DWC3
+ help
+ Support T-HEAD platform with DesignWare Core USB3 IP.
+ Only the host mode is currently supported.
+ Say 'Y' or 'M' here if you have one such device.
+
endif
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index fe1493d4bbe5..9523a51dd279 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -55,3 +55,4 @@ obj-$(CONFIG_USB_DWC3_QCOM) += dwc3-qcom.o
obj-$(CONFIG_USB_DWC3_IMX8MP) += dwc3-imx8mp.o
obj-$(CONFIG_USB_DWC3_XILINX) += dwc3-xilinx.o
obj-$(CONFIG_USB_DWC3_OCTEON) += dwc3-octeon.o
+obj-$(CONFIG_USB_DWC3_THEAD) += dwc3-thead.o
diff --git a/drivers/usb/dwc3/dwc3-thead.c b/drivers/usb/dwc3/dwc3-thead.c
new file mode 100644
index 000000000000..999b1e319c72
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-thead.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * dwc3-thead.c - T-HEAD platform specific glue layer
+ *
+ * Inspired by dwc3-of-simple.c
+ *
+ * Copyright (C) 2021 Alibaba Group Holding Limited.
+ * Copyright (C) 2023 Jisheng Zhang <jszhang@xxxxxxxxxx>
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "core.h"
+
+#define USB_SSP_EN 0x34
+#define REF_SSP_EN BIT(0)
+#define USB_SYS 0x3c
+#define COMMONONN BIT(0)
+
+#define USB3_DRD_SWRST 0x14
+#define USB3_DRD_PRST BIT(0)
+#define USB3_DRD_PHYRST BIT(1)
+#define USB3_DRD_VCCRST BIT(2)
+#define USB3_DRD_RSTMASK (USB3_DRD_PRST | USB3_DRD_PHYRST | USB3_DRD_VCCRST)
+
+struct dwc3_thead {
+ void __iomem *base;
+ struct regmap *misc_sysreg;
+ struct regulator *vbus;
+};
+
+static void dwc3_thead_optimize_power(struct dwc3_thead *thead)
+{
+ u32 val;
+
+ /* config usb top within USB ctrl & PHY reset */
+ regmap_update_bits(thead->misc_sysreg, USB3_DRD_SWRST,
+ USB3_DRD_RSTMASK, USB3_DRD_PRST);
+
+ /*
+ * dwc reg also need to be configed to save power
+ * 1. set USB_SYS[COMMONONN]
+ * 2. set DWC3_GCTL[SOFITPSYNC](done by core.c)
+ * 3. set GUSB3PIPECTL[SUSPENDEN] (done by core.c)
+ */
+ val = readl(thead->base + USB_SYS);
+ val |= COMMONONN;
+ writel(val, thead->base + USB_SYS);
+ val = readl(thead->base + USB_SSP_EN);
+ val |= REF_SSP_EN;
+ writel(val, thead->base + USB_SSP_EN);
+
+ regmap_update_bits(thead->misc_sysreg, USB3_DRD_SWRST,
+ USB3_DRD_RSTMASK, USB3_DRD_RSTMASK);
+}
+
+static int dwc3_thead_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct dwc3_thead *thead;
+ int ret;
+
+ thead = devm_kzalloc(&pdev->dev, sizeof(*thead), GFP_KERNEL);
+ if (!thead)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, thead);
+
+ ret = devm_regulator_get_enable_optional(dev, "vbus");
+ if (ret < 0 && ret != -ENODEV)
+ return ret;
+
+ thead->misc_sysreg = syscon_regmap_lookup_by_phandle(np, "thead,misc-sysreg");
+ if (IS_ERR(thead->misc_sysreg))
+ return PTR_ERR(thead->misc_sysreg);
+
+ thead->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(thead->base))
+ return PTR_ERR(thead->base);
+
+ dwc3_thead_optimize_power(thead);
+
+ return of_platform_populate(np, NULL, NULL, dev);
+}
+
+static void dwc3_thead_remove(struct platform_device *pdev)
+{
+ of_platform_depopulate(&pdev->dev);
+}
+
+static const struct of_device_id dwc3_thead_of_match[] = {
+ { .compatible = "thead,th1520-usb" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, dwc3_thead_of_match);
+
+static struct platform_driver dwc3_thead_driver = {
+ .probe = dwc3_thead_probe,
+ .remove_new = dwc3_thead_remove,
+ .driver = {
+ .name = "dwc3-thead",
+ .of_match_table = dwc3_thead_of_match,
+ },
+};
+module_platform_driver(dwc3_thead_driver);
+
+MODULE_ALIAS("platform:dwc3-thead");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare DWC3 T-HEAD Glue Driver");
+MODULE_AUTHOR("Jisheng Zhang <jszhang@xxxxxxxxxx>");
--
2.40.1
