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Message-ID: <20250730074156.1600-1-zhangsenchuan@eswincomputing.com>
Date: Wed, 30 Jul 2025 15:41:55 +0800
From: zhangsenchuan@...incomputing.com
To: gregkh@...uxfoundation.org,
robh@...nel.org,
krzk+dt@...nel.org,
conor+dt@...nel.org,
linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org,
Thinh.Nguyen@...opsys.com,
p.zabel@...gutronix.de
Cc: ningyu@...incomputing.com,
linmin@...incomputing.com,
yangwei1@...incomputing.com,
pinkesh.vaghela@...fochips.com,
Senchuan Zhang <zhangsenchuan@...incomputing.com>
Subject: [PATCH v2 2/2] usb: dwc3: eic7700: Add EIC7700 USB driver
From: Senchuan Zhang <zhangsenchuan@...incomputing.com>
Add the eic7700 usb driver, which is responsible for
identifying,configuring and connecting usb devices.
Co-developed-by: Wei Yang <yangwei1@...incomputing.com>
Signed-off-by: Wei Yang <yangwei1@...incomputing.com>
Signed-off-by: Senchuan Zhang <zhangsenchuan@...incomputing.com>
---
drivers/usb/dwc3/Kconfig | 11 ++
drivers/usb/dwc3/Makefile | 1 +
drivers/usb/dwc3/dwc3-eic7700.c | 207 ++++++++++++++++++++++++++++++++
3 files changed, 219 insertions(+)
create mode 100644 drivers/usb/dwc3/dwc3-eic7700.c
diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 310d182e10b5..19657cfb5d08 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -189,4 +189,15 @@ config USB_DWC3_RTK
or dual-role mode.
Say 'Y' or 'M' if you have such device.
+config USB_DWC3_EIC7700
+ tristate "Eswin Platforms"
+ depends on OF
+ depends on USB=y || USB=USB_DWC3
+ default USB_DWC3
+ help
+ The usb controller on eic7700 SoC.
+ support of USB2/3 functionality
+ in Eswin platforms.
+ say 'Y' or 'M' if you have one such device.
+
endif
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index 830e6c9e5fe0..05f582103f8b 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -57,3 +57,4 @@ 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_EIC7700) += dwc3-eic7700.o
diff --git a/drivers/usb/dwc3/dwc3-eic7700.c b/drivers/usb/dwc3/dwc3-eic7700.c
new file mode 100644
index 000000000000..337f6c1cbe66
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-eic7700.c
@@ -0,0 +1,207 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Eswin Specific Glue layer
+ *
+ * Copyright 2025, Beijing ESWIN Computing Technology Co., Ltd.
+ *
+ * Authors: Wei Yang <yangwei1@...incomputing.com>
+ * Senchuan Zhang <zhangsenchuan@...incomputing.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/reset.h>
+#include <linux/usb.h>
+#include <linux/pm.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#define HSP_USB_VBUS_FSEL 0x2a
+#define HSP_USB_MPLL_DEFAULT 0x0
+
+#define HSP_USB_BUS_FILTER_EN (0x1 << 0)
+#define HSP_USB_BUS_CLKEN_GM (0x1 << 9)
+#define HSP_USB_BUS_CLKEN_GS (0x1 << 16)
+#define HSP_USB_BUS_SW_RST (0x1 << 24)
+#define HSP_USB_BUS_CLK_EN (0x1 << 28)
+
+#define HSP_USB_AXI_LP_XM_CSYSREQ (0x1 << 0)
+#define HSP_USB_AXI_LP_XS_CSYSREQ (0x1 << 16)
+
+struct dwc3_eswin {
+ int num_clks;
+ struct device *dev;
+ struct clk_bulk_data *clks;
+ struct reset_control *vaux_rst;
+};
+
+static int dwc_usb_clk_init(struct device *dev)
+{
+ struct regmap *regmap;
+ u32 hsp_usb_bus;
+ u32 hsp_usb_axi_lp;
+ u32 hsp_usb_vbus_freq;
+ u32 hsp_usb_mpll;
+ u32 args[4];
+
+ regmap = syscon_regmap_lookup_by_phandle_args(dev->of_node,
+ "eswin,hsp-sp-csr", 4,
+ args);
+ if (IS_ERR(regmap)) {
+ dev_err(dev, "No hsp-sp-csr phandle specified\n");
+ return PTR_ERR(regmap);
+ }
+
+ hsp_usb_bus = args[0];
+ hsp_usb_axi_lp = args[1];
+ hsp_usb_vbus_freq = args[2];
+ hsp_usb_mpll = args[3];
+
+ /*
+ * usb clock init
+ * ref clock is 24M, below need to be set to satisfy
+ * usb phy requirement(125M)
+ */
+ regmap_write(regmap, hsp_usb_vbus_freq, HSP_USB_VBUS_FSEL);
+ regmap_write(regmap, hsp_usb_mpll, HSP_USB_MPLL_DEFAULT);
+ /*
+ * reset usb core and usb phy
+ */
+ regmap_write(regmap, hsp_usb_bus, HSP_USB_BUS_FILTER_EN |
+ HSP_USB_BUS_CLKEN_GM | HSP_USB_BUS_CLKEN_GS |
+ HSP_USB_BUS_SW_RST | HSP_USB_BUS_CLK_EN);
+ regmap_write(regmap, hsp_usb_axi_lp, HSP_USB_AXI_LP_XM_CSYSREQ |
+ HSP_USB_AXI_LP_XS_CSYSREQ);
+
+ return 0;
+}
+
+static int dwc3_eswin_probe(struct platform_device *pdev)
+{
+ struct dwc3_eswin *eswin;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ int ret;
+
+ eswin = devm_kzalloc(dev, sizeof(*eswin), GFP_KERNEL);
+ if (!eswin)
+ return -ENOMEM;
+
+ eswin->dev = dev;
+ platform_set_drvdata(pdev, eswin);
+
+ eswin->num_clks = devm_clk_bulk_get_all_enabled(dev, &eswin->clks);
+ if (eswin->num_clks < 0)
+ return dev_err_probe(dev, eswin->num_clks,
+ "Failed to get usb clocks\n");
+
+ eswin->vaux_rst = devm_reset_control_get(dev, "vaux");
+ if (IS_ERR(eswin->vaux_rst))
+ return dev_err_probe(dev, PTR_ERR(eswin->vaux_rst),
+ "Failed to get vaux reset\n");
+
+ ret = reset_control_deassert(eswin->vaux_rst);
+ if (ret)
+ return dev_err_probe(eswin->dev, ret,
+ "Failed to deassert reset\n");
+
+ ret = dwc_usb_clk_init(dev);
+ if (ret) {
+ dev_err(eswin->dev, "Failed to clk init: %d\n", ret);
+ goto reset_assert;
+ }
+
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ dev_err(dev, "get_sync failed with err %d\n", ret);
+ goto disable_pm;
+ }
+
+ /* Allocate and initialize the core */
+ ret = of_platform_populate(np, NULL, NULL, dev);
+ if (ret) {
+ dev_err(dev, "failed to create dwc3 core: %d\n", ret);
+ goto put_pm;
+ }
+
+ return ret;
+
+put_pm:
+ pm_runtime_put_sync(dev);
+disable_pm:
+ pm_runtime_disable(dev);
+reset_assert:
+ reset_control_assert(eswin->vaux_rst);
+
+ return ret;
+}
+
+static void dwc3_eswin_remove(struct platform_device *pdev)
+{
+ struct dwc3_eswin *eswin = platform_get_drvdata(pdev);
+ struct device *dev = &pdev->dev;
+
+ of_platform_depopulate(dev);
+
+ pm_runtime_put_sync(dev);
+ pm_runtime_disable(dev);
+ reset_control_assert(eswin->vaux_rst);
+}
+
+static int __maybe_unused dwc3_eswin_runtime_suspend(struct device *dev)
+{
+ struct dwc3_eswin *eswin = dev_get_drvdata(dev);
+
+ clk_bulk_disable_unprepare(eswin->num_clks, eswin->clks);
+
+ return 0;
+}
+
+static int __maybe_unused dwc3_eswin_runtime_resume(struct device *dev)
+{
+ struct dwc3_eswin *eswin = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_bulk_prepare_enable(eswin->num_clks, eswin->clks);
+ if (ret) {
+ dev_err(dev, "failed to enable clocks: %d\n", ret);
+ return ret;
+ }
+
+ return ret;
+}
+
+static const struct dev_pm_ops dwc3_eswin_dev_pm_ops = {
+ SET_RUNTIME_PM_OPS(dwc3_eswin_runtime_suspend,
+ dwc3_eswin_runtime_resume, NULL)
+};
+
+static const struct of_device_id eswin_dwc3_match[] = {
+ { .compatible = "eswin,eic7700-dwc3" },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, eswin_dwc3_match);
+
+static struct platform_driver dwc3_eswin_driver = {
+ .probe = dwc3_eswin_probe,
+ .remove = dwc3_eswin_remove,
+ .driver = {
+ .name = "eic7700-dwc3",
+ .pm = &dwc3_eswin_dev_pm_ops,
+ .of_match_table = eswin_dwc3_match,
+ },
+};
+
+module_platform_driver(dwc3_eswin_driver);
+
+MODULE_AUTHOR("Wei Yang <yangwei1@...incomputing.com");
+MODULE_AUTHOR("Senchuan Zhang <zhangsenchuan@...incomputing.com");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("DesignWare USB3 ESWIN Glue Layer");
--
2.25.1
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