kernel-5.15/0608-Baikal-M-USB-driver.patch

From 91e33969c0864de65db59308b298d321a5280daa Mon Sep 17 00:00:00 2001
From: Alexey Sheplyakov <asheplyakov@altlinux.org>
Date: Fri, 20 Mar 2020 14:02:43 +0400
Subject: [PATCH 608/625] Baikal-M: USB driver

(cherry picked from commit 136cab54114b2b0b61cf503065d6d547f3d3d5a2)
---
 drivers/usb/dwc3/Kconfig       |   9 +++
 drivers/usb/dwc3/Makefile      |   1 +
 drivers/usb/dwc3/dwc3-baikal.c | 126 +++++++++++++++++++++++++++++++++
 3 files changed, 136 insertions(+)
 create mode 100644 drivers/usb/dwc3/dwc3-baikal.c

diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 7a2304565a73..121f8e708d51 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -139,4 +139,13 @@ config USB_DWC3_QCOM
 	  for peripheral mode support.
 	  Say 'Y' or 'M' if you have one such device.
 
+config USB_DWC3_BAIKAL
+	tristate "Baikal Electronics Platforms"
+	depends on OF
+	default USB_DWC3
+	help
+	  Baikal Electronics SoCs with one DesignWare Core USB3 IP
+	  inside.
+	  Say 'Y' or 'M' if you have one such device.
+
 endif
diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index ae86da0dc5bd..0dcaf92a43ec 100644
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -51,3 +51,4 @@ obj-$(CONFIG_USB_DWC3_MESON_G12A)	+= dwc3-meson-g12a.o
 obj-$(CONFIG_USB_DWC3_OF_SIMPLE)	+= dwc3-of-simple.o
 obj-$(CONFIG_USB_DWC3_ST)		+= dwc3-st.o
 obj-$(CONFIG_USB_DWC3_QCOM)		+= dwc3-qcom.o
+obj-$(CONFIG_USB_DWC3_BAIKAL)		+= dwc3-baikal.o
diff --git a/drivers/usb/dwc3/dwc3-baikal.c b/drivers/usb/dwc3/dwc3-baikal.c
new file mode 100644
index 000000000000..2426dc49bd79
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-baikal.c
@@ -0,0 +1,126 @@
+/**
+ * dwc3-baikal.c - Baikal Electronics SoCs Specific Glue layer
+ *
+ * Copyright (C) 2015 Baikal Electronics JSC - http://www.baikalelectronics.ru
+ *
+ * Author: Dmitry Dunaev <dmitry.dunaev@baikalelectronics.ru>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2  of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/usb/usb_phy_generic.h>
+#include <linux/io.h>
+#include <linux/of_platform.h>
+
+struct dwc3_baikal {
+	struct device	*dev;
+	struct clk	*clk;
+};
+
+static int be_dwc3_probe(struct platform_device *pdev)
+{
+	struct device		*dev = &pdev->dev;
+	struct device_node	*node = pdev->dev.of_node;
+	struct dwc3_baikal	*dwc;
+	int			ret;
+
+	dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
+	if (!dwc)
+		return -ENOMEM;
+
+	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
+	if (ret) {
+		dev_err(dev, "DMA mask error %d\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, dwc);
+	dwc->dev = dev;
+
+	dwc->clk = devm_clk_get(dwc->dev, "usb");
+	if (IS_ERR(dwc->clk)) {
+		dev_err(dev, "no interface clk specified\n");
+		return -EINVAL;
+	}
+
+	ret = clk_prepare_enable(dwc->clk);
+	if (ret < 0) {
+		dev_err(dwc->dev, "unable to enable usb clock\n");
+		return ret;
+	}
+
+	if (node) {
+			ret = of_platform_populate(node, NULL, NULL, dev);
+			if (ret) {
+				dev_err(&pdev->dev, "failed to create dwc3 core\n");
+				goto __error;
+			}
+	} else {
+		dev_err(dev, "no device node, failed to add dwc3 core\n");
+		ret = -ENODEV;
+		goto __error;
+	}
+
+	return 0;
+
+__error:
+	clk_disable_unprepare(dwc->clk);
+
+	return ret;
+}
+
+static int be_dwc3_remove_core(struct device *dev, void *c)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	platform_device_unregister(pdev);
+
+	return 0;
+}
+
+static int be_dwc3_remove(struct platform_device *pdev)
+{
+	struct dwc3_baikal *dwc = platform_get_drvdata(pdev);
+
+	device_for_each_child(&pdev->dev, NULL, be_dwc3_remove_core);
+	clk_disable_unprepare(dwc->clk);
+
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static const struct of_device_id be_dwc3_of_match[] = {
+	{ .compatible = "be,baikal-dwc3", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, be_dwc3_of_match);
+
+static struct platform_driver be_dwc3_driver = {
+	.probe		= be_dwc3_probe,
+	.remove		= be_dwc3_remove,
+	.driver		= {
+		.name	= "baikal-dwc3",
+		.of_match_table	= be_dwc3_of_match,
+	},
+};
+
+module_platform_driver(be_dwc3_driver);
+
+MODULE_ALIAS("platform:baikal-dwc3");
+MODULE_AUTHOR("Dmitry Dunaev <dmitry.dunaev@baikalelectronics.ru>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare USB3 Baikal SoCs Glue Layer");
-- 
2.31.1