1 files changed, 264 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
new file mode 100644
index 000000000..1ef89a431
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-of-simple.c
@@ -0,0 +1,264 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * dwc3-of-simple.c - OF glue layer for simple integrations
+ *
+ * Copyright (c) 2015 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Author: Felipe Balbi <balbi@ti.com>
+ *
+ * This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov
+ * <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC
+ * by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+
+struct dwc3_of_simple {
+	struct device		*dev;
+	struct clk		**clks;
+	int			num_clocks;
+	struct reset_control	*resets;
+	bool			pulse_resets;
+	bool			need_reset;
+};
+
+static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count)
+{
+	struct device		*dev = simple->dev;
+	struct device_node	*np = dev->of_node;
+	int			i;
+
+	simple->num_clocks = count;
+
+	if (!count)
+		return 0;
+
+	simple->clks = devm_kcalloc(dev, simple->num_clocks,
+			sizeof(struct clk *), GFP_KERNEL);
+	if (!simple->clks)
+		return -ENOMEM;
+
+	for (i = 0; i < simple->num_clocks; i++) {
+		struct clk	*clk;
+		int		ret;
+
+		clk = of_clk_get(np, i);
+		if (IS_ERR(clk)) {
+			while (--i >= 0) {
+				clk_disable_unprepare(simple->clks[i]);
+				clk_put(simple->clks[i]);
+			}
+			return PTR_ERR(clk);
+		}
+
+		ret = clk_prepare_enable(clk);
+		if (ret < 0) {
+			while (--i >= 0) {
+				clk_disable_unprepare(simple->clks[i]);
+				clk_put(simple->clks[i]);
+			}
+			clk_put(clk);
+
+			return ret;
+		}
+
+		simple->clks[i] = clk;
+	}
+
+	return 0;
+}
+
+static int dwc3_of_simple_probe(struct platform_device *pdev)
+{
+	struct dwc3_of_simple	*simple;
+	struct device		*dev = &pdev->dev;
+	struct device_node	*np = dev->of_node;
+
+	int			ret;
+	int			i;
+	bool			shared_resets = false;
+
+	simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
+	if (!simple)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, simple);
+	simple->dev = dev;
+
+	/*
+	 * Some controllers need to toggle the usb3-otg reset before trying to
+	 * initialize the PHY, otherwise the PHY times out.
+	 */
+	if (of_device_is_compatible(np, "rockchip,rk3399-dwc3"))
+		simple->need_reset = true;
+
+	if (of_device_is_compatible(np, "amlogic,meson-axg-dwc3") ||
+	    of_device_is_compatible(np, "amlogic,meson-gxl-dwc3")) {
+		shared_resets = true;
+		simple->pulse_resets = true;
+	}
+
+	simple->resets = of_reset_control_array_get(np, shared_resets, true);
+	if (IS_ERR(simple->resets)) {
+		ret = PTR_ERR(simple->resets);
+		dev_err(dev, "failed to get device resets, err=%d\n", ret);
+		return ret;
+	}
+
+	if (simple->pulse_resets) {
+		ret = reset_control_reset(simple->resets);
+		if (ret)
+			goto err_resetc_put;
+	} else {
+		ret = reset_control_deassert(simple->resets);
+		if (ret)
+			goto err_resetc_put;
+	}
+
+	ret = dwc3_of_simple_clk_init(simple, of_count_phandle_with_args(np,
+						"clocks", "#clock-cells"));
+	if (ret)
+		goto err_resetc_assert;
+
+	ret = of_platform_populate(np, NULL, NULL, dev);
+	if (ret) {
+		for (i = 0; i < simple->num_clocks; i++) {
+			clk_disable_unprepare(simple->clks[i]);
+			clk_put(simple->clks[i]);
+		}
+
+		goto err_resetc_assert;
+	}
+
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	pm_runtime_get_sync(dev);
+
+	return 0;
+
+err_resetc_assert:
+	if (!simple->pulse_resets)
+		reset_control_assert(simple->resets);
+
+err_resetc_put:
+	reset_control_put(simple->resets);
+	return ret;
+}
+
+static int dwc3_of_simple_remove(struct platform_device *pdev)
+{
+	struct dwc3_of_simple	*simple = platform_get_drvdata(pdev);
+	struct device		*dev = &pdev->dev;
+	int			i;
+
+	of_platform_depopulate(dev);
+
+	for (i = 0; i < simple->num_clocks; i++) {
+		clk_disable_unprepare(simple->clks[i]);
+		clk_put(simple->clks[i]);
+	}
+	simple->num_clocks = 0;
+
+	if (!simple->pulse_resets)
+		reset_control_assert(simple->resets);
+
+	reset_control_put(simple->resets);
+
+	pm_runtime_disable(dev);
+	pm_runtime_put_noidle(dev);
+	pm_runtime_set_suspended(dev);
+
+	return 0;
+}
+
+static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev)
+{
+	struct dwc3_of_simple	*simple = dev_get_drvdata(dev);
+	int			i;
+
+	for (i = 0; i < simple->num_clocks; i++)
+		clk_disable(simple->clks[i]);
+
+	return 0;
+}
+
+static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev)
+{
+	struct dwc3_of_simple	*simple = dev_get_drvdata(dev);
+	int			ret;
+	int			i;
+
+	for (i = 0; i < simple->num_clocks; i++) {
+		ret = clk_enable(simple->clks[i]);
+		if (ret < 0) {
+			while (--i >= 0)
+				clk_disable(simple->clks[i]);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int __maybe_unused dwc3_of_simple_suspend(struct device *dev)
+{
+	struct dwc3_of_simple *simple = dev_get_drvdata(dev);
+
+	if (simple->need_reset)
+		reset_control_assert(simple->resets);
+
+	return 0;
+}
+
+static int __maybe_unused dwc3_of_simple_resume(struct device *dev)
+{
+	struct dwc3_of_simple *simple = dev_get_drvdata(dev);
+
+	if (simple->need_reset)
+		reset_control_deassert(simple->resets);
+
+	return 0;
+}
+
+static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume)
+	SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
+			dwc3_of_simple_runtime_resume, NULL)
+};
+
+static const struct of_device_id of_dwc3_simple_match[] = {
+	{ .compatible = "rockchip,rk3399-dwc3" },
+	{ .compatible = "xlnx,zynqmp-dwc3" },
+	{ .compatible = "cavium,octeon-7130-usb-uctl" },
+	{ .compatible = "sprd,sc9860-dwc3" },
+	{ .compatible = "amlogic,meson-axg-dwc3" },
+	{ .compatible = "amlogic,meson-gxl-dwc3" },
+	{ .compatible = "allwinner,sun50i-h6-dwc3" },
+	{ .compatible = "hisilicon,hi3670-dwc3" },
+	{ /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);
+
+static struct platform_driver dwc3_of_simple_driver = {
+	.probe		= dwc3_of_simple_probe,
+	.remove		= dwc3_of_simple_remove,
+	.driver		= {
+		.name	= "dwc3-of-simple",
+		.of_match_table = of_dwc3_simple_match,
+		.pm	= &dwc3_of_simple_dev_pm_ops,
+	},
+};
+
+module_platform_driver(dwc3_of_simple_driver);
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
+MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");