[PATCH 6/7] usb: dwc3: add spacemit dwc3 glue layer driver

Ze Huang
2025-04-07T15:12:39Z

Add SpacemiT glue logic to support dwc3 HC on K1 SoC. The driver manages
clock, reset and interrupt resource.

Signed-off-by: Ze Huang <huangze@whut.edu.cn>
---
drivers/usb/dwc3/Kconfig | 7 +++
drivers/usb/dwc3/Makefile | 1 +
drivers/usb/dwc3/dwc3-spacemit.c | 127 +++++++++++++++++++++++++++++++++++++++
3 files changed, 135 insertions(+)

diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 310d182e10b50b253d7e5a51674806e6ec442a2a..3c30680fa4f83565fc03c6800e867c6ced0fe101 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -189,4 +189,11 @@ config USB_DWC3_RTK
or dual-role mode.
Say 'Y' or 'M' if you have such device.

+config USB_DWC3_SPACEMIT
+ tristate "Spacemit Platforms"
+ default USB_DWC3
+ help
+ Support SPACEMIT platforms with DesignWare Core USB3 IP.
+ 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 124eda2522d9c1f4caab222ec9770d0deaf655fc..61a87765c0c591e0a53c33b5a6544db056166f96 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -56,3 +56,4 @@ 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_RTK) += dwc3-rtk.o
+obj-$(CONFIG_USB_DWC3_SPACEMIT) += dwc3-spacemit.o
diff --git a/drivers/usb/dwc3/dwc3-spacemit.c b/drivers/usb/dwc3/dwc3-spacemit.c
new file mode 100644
index 0000000000000000000000000000000000000000..4574ad3b34a200ffe999c7da61b74c2ef33c0483
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-spacemit.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * dwc3-spacemit.c - Spacemit DWC3 Specific Glue layer
+ *
+ * Copyright (C) 2025 SpacemiT (Hangzhou) Technology Co. Ltd
+ *
+ * Author: Wilson <long.wan@spacemit.com>
+ * Contributor: Ze Huang <huangze@whut.edu.cn>
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+struct dwc3_spacemit {
+ struct device *dev;
+ struct clk *clk;
+ struct reset_control *reset;
+};
+
+static int dwc3_spacemit_init(struct dwc3_spacemit *data)
+{
+ struct device *dev = data->dev;
+ int ret = 0;
+
+ data->reset = devm_reset_control_get(dev, NULL);
+ if (IS_ERR(data->reset))
+ return dev_err_probe(dev, PTR_ERR(data->reset), "failed to get reset\n");
+
+ ret = reset_control_assert(data->reset);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to assert reset\n");
+
+ usleep_range(10, 20);
+
+ ret = reset_control_deassert(data->reset);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to deassert reset\n");
+
+ return 0;
+}
+
+static int dwc3_spacemit_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->of_node;
+ struct dwc3_spacemit *spacemit;
+ int ret;
+
+ spacemit = devm_kzalloc(dev, sizeof(*spacemit), GFP_KERNEL);
+ if (!spacemit)
+ return -ENOMEM;
+
+ spacemit->dev = dev;
+
+ platform_set_drvdata(pdev, spacemit);
+
+ spacemit->clk = devm_clk_get_enabled(dev, NULL);
+ if (IS_ERR(spacemit->clk))
+ return dev_err_probe(dev, PTR_ERR(spacemit->clk), "Failed to get clock\n");
+
+ ret = dwc3_spacemit_init(spacemit);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to init SpacemiT USB3 glue\n");
+
+ ret = of_platform_populate(node, NULL, NULL, dev);
+ if (ret)
+ dev_err_probe(dev, ret, "failed to add dwc3 core\n");
+
+ return 0;
+}
+
+static void dwc3_spacemit_remove(struct platform_device *pdev)
+{
+ of_platform_depopulate(&pdev->dev);
+}
+
+static const struct of_device_id spacemit_dwc3_match[] = {
+ { .compatible = "spacemit,k1-dwc3", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, spacemit_dwc3_match);
+
+#ifdef CONFIG_PM_SLEEP
+static int dwc3_spacemit_suspend(struct device *dev)
+{
+ struct dwc3_spacemit *spacemit = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(spacemit->clk);
+
+ return 0;
+}
+
+static int dwc3_spacemit_resume(struct device *dev)
+{
+ struct dwc3_spacemit *spacemit = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(spacemit->clk);
+
+ return ret;
+}
+
+static const struct dev_pm_ops dwc3_spacemit_dev_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(dwc3_spacemit_suspend, dwc3_spacemit_resume)
+};
+#endif /* CONFIG_PM_SLEEP */
+
+static struct platform_driver dwc3_spacemit_driver = {
+ .probe = dwc3_spacemit_probe,
+ .remove = dwc3_spacemit_remove,
+ .driver = {
+ .name = "spacemit-dwc3",
+ .of_match_table = spacemit_dwc3_match,
+#ifdef CONFIG_PM_SLEEP
+ .pm = &dwc3_spacemit_dev_pm_ops,
+#endif /* CONFIG_PM_SLEEP */
+ },
+};
+module_platform_driver(dwc3_spacemit_driver);
+
+MODULE_AUTHOR("Wilson <long.wan@spacemit.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("DesignWare USB3 Spacemit Glue Layer");

--
2.49.0