drivers/usb/dwc3/dwc3-xilinx.c - SHIFTPHONES/mainline/linux - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * dwc3-xilinx.c - Xilinx DWC3 controller specific glue driver
  *
  * Authors: Manish Narani <manish.narani@xilinx.com>
  *          Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/of_platform.h>
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
 #include <linux/of_address.h>
 #include <linux/delay.h>
 #include <linux/firmware/xlnx-zynqmp.h>
 #include <linux/io.h>

 #include <linux/phy/phy.h>

 /* USB phy reset mask register */
 #define XLNX_USB_PHY_RST_EN			0x001C
 #define XLNX_PHY_RST_MASK			0x1

 /* Xilinx USB 3.0 IP Register */
 #define XLNX_USB_TRAFFIC_ROUTE_CONFIG		0x005C
 #define XLNX_USB_TRAFFIC_ROUTE_FPD		0x1

 /* Versal USB Reset ID */
 #define VERSAL_USB_RESET_ID			0xC104036

 #define XLNX_USB_FPD_PIPE_CLK			0x7c
 #define PIPE_CLK_DESELECT			1
 #define PIPE_CLK_SELECT				0
 #define XLNX_USB_FPD_POWER_PRSNT		0x80
 #define FPD_POWER_PRSNT_OPTION			BIT(0)

 struct dwc3_xlnx {
 	int				num_clocks;
 	struct clk_bulk_data		*clks;
 	struct device			*dev;
 	void __iomem			*regs;
 	int				(*pltfm_init)(struct dwc3_xlnx *data);
 };

 static void dwc3_xlnx_mask_phy_rst(struct dwc3_xlnx *priv_data, bool mask)
 {
 	u32 reg;

 	/*
 	 * Enable or disable ULPI PHY reset from USB Controller.
 	 * This does not actually reset the phy, but just controls
 	 * whether USB controller can or cannot reset ULPI PHY.
 	 */
 	reg = readl(priv_data->regs + XLNX_USB_PHY_RST_EN);

 	if (mask)
 		reg &= ~XLNX_PHY_RST_MASK;
 	else
 		reg |= XLNX_PHY_RST_MASK;

 	writel(reg, priv_data->regs + XLNX_USB_PHY_RST_EN);
 }

 static int dwc3_xlnx_init_versal(struct dwc3_xlnx *priv_data)
 {
 	struct device		*dev = priv_data->dev;
 	int			ret;

 	dwc3_xlnx_mask_phy_rst(priv_data, false);

 	/* Assert and De-assert reset */
 	ret = zynqmp_pm_reset_assert(VERSAL_USB_RESET_ID,
 				     PM_RESET_ACTION_ASSERT);
 	if (ret < 0) {
 		dev_err_probe(dev, ret, "failed to assert Reset\n");
 		return ret;
 	}

 	ret = zynqmp_pm_reset_assert(VERSAL_USB_RESET_ID,
 				     PM_RESET_ACTION_RELEASE);
 	if (ret < 0) {
 		dev_err_probe(dev, ret, "failed to De-assert Reset\n");
 		return ret;
 	}

 	dwc3_xlnx_mask_phy_rst(priv_data, true);

 	return 0;
 }

 static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
 {
 	struct device		*dev = priv_data->dev;
 	struct reset_control	*crst, *hibrst, *apbrst;
 	struct phy		*usb3_phy;
 	int			ret;
 	u32			reg;

 	usb3_phy = devm_phy_optional_get(dev, "usb3-phy");
 	if (IS_ERR(usb3_phy)) {
 		ret = PTR_ERR(usb3_phy);
 		dev_err_probe(dev, ret,
 			      "failed to get USB3 PHY\n");
 		goto err;
 	}

 	/*
 	 * The following core resets are not required unless a USB3 PHY
 	 * is used, and the subsequent register settings are not required
 	 * unless a core reset is performed (they should be set properly
 	 * by the first-stage boot loader, but may be reverted by a core
 	 * reset). They may also break the configuration if USB3 is actually
 	 * in use but the usb3-phy entry is missing from the device tree.
 	 * Therefore, skip these operations in this case.
 	 */
 	if (!usb3_phy)
 		goto skip_usb3_phy;

 	crst = devm_reset_control_get_exclusive(dev, "usb_crst");
 	if (IS_ERR(crst)) {
 		ret = PTR_ERR(crst);
 		dev_err_probe(dev, ret,
 			      "failed to get core reset signal\n");
 		goto err;
 	}

 	hibrst = devm_reset_control_get_exclusive(dev, "usb_hibrst");
 	if (IS_ERR(hibrst)) {
 		ret = PTR_ERR(hibrst);
 		dev_err_probe(dev, ret,
 			      "failed to get hibernation reset signal\n");
 		goto err;
 	}

 	apbrst = devm_reset_control_get_exclusive(dev, "usb_apbrst");
 	if (IS_ERR(apbrst)) {
 		ret = PTR_ERR(apbrst);
 		dev_err_probe(dev, ret,
 			      "failed to get APB reset signal\n");
 		goto err;
 	}

 	ret = reset_control_assert(crst);
 	if (ret < 0) {
 		dev_err(dev, "Failed to assert core reset\n");
 		goto err;
 	}

 	ret = reset_control_assert(hibrst);
 	if (ret < 0) {
 		dev_err(dev, "Failed to assert hibernation reset\n");
 		goto err;
 	}

 	ret = reset_control_assert(apbrst);
 	if (ret < 0) {
 		dev_err(dev, "Failed to assert APB reset\n");
 		goto err;
 	}

 	ret = phy_init(usb3_phy);
 	if (ret < 0) {
 		phy_exit(usb3_phy);
 		goto err;
 	}

 	ret = reset_control_deassert(apbrst);
 	if (ret < 0) {
 		dev_err(dev, "Failed to release APB reset\n");
 		goto err;
 	}

 	/* Set PIPE Power Present signal in FPD Power Present Register*/
 	writel(FPD_POWER_PRSNT_OPTION, priv_data->regs + XLNX_USB_FPD_POWER_PRSNT);

 	/* Set the PIPE Clock Select bit in FPD PIPE Clock register */
 	writel(PIPE_CLK_SELECT, priv_data->regs + XLNX_USB_FPD_PIPE_CLK);

 	ret = reset_control_deassert(crst);
 	if (ret < 0) {
 		dev_err(dev, "Failed to release core reset\n");
 		goto err;
 	}

 	ret = reset_control_deassert(hibrst);
 	if (ret < 0) {
 		dev_err(dev, "Failed to release hibernation reset\n");
 		goto err;
 	}

 	ret = phy_power_on(usb3_phy);
 	if (ret < 0) {
 		phy_exit(usb3_phy);
 		goto err;
 	}

 skip_usb3_phy:
 	/*
 	 * This routes the USB DMA traffic to go through FPD path instead
 	 * of reaching DDR directly. This traffic routing is needed to
 	 * make SMMU and CCI work with USB DMA.
 	 */
 	if (of_dma_is_coherent(dev->of_node) || device_iommu_mapped(dev)) {
 		reg = readl(priv_data->regs + XLNX_USB_TRAFFIC_ROUTE_CONFIG);
 		reg |= XLNX_USB_TRAFFIC_ROUTE_FPD;
 		writel(reg, priv_data->regs + XLNX_USB_TRAFFIC_ROUTE_CONFIG);
 	}

 err:
 	return ret;
 }

 static const struct of_device_id dwc3_xlnx_of_match[] = {
 	{
 		.compatible = "xlnx,zynqmp-dwc3",
 		.data = &dwc3_xlnx_init_zynqmp,
 	},
 	{
 		.compatible = "xlnx,versal-dwc3",
 		.data = &dwc3_xlnx_init_versal,
 	},
 	{ /* Sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, dwc3_xlnx_of_match);

 static int dwc3_xlnx_probe(struct platform_device *pdev)
 {
 	struct dwc3_xlnx		*priv_data;
 	struct device			*dev = &pdev->dev;
 	struct device_node		*np = dev->of_node;
 	const struct of_device_id	*match;
 	void __iomem			*regs;
 	int				ret;

 	priv_data = devm_kzalloc(dev, sizeof(*priv_data), GFP_KERNEL);
 	if (!priv_data)
 		return -ENOMEM;

 	regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(regs)) {
 		ret = PTR_ERR(regs);
 		dev_err_probe(dev, ret, "failed to map registers\n");
 		return ret;
 	}

 	match = of_match_node(dwc3_xlnx_of_match, pdev->dev.of_node);

 	priv_data->pltfm_init = match->data;
 	priv_data->regs = regs;
 	priv_data->dev = dev;

 	platform_set_drvdata(pdev, priv_data);

 	ret = devm_clk_bulk_get_all(priv_data->dev, &priv_data->clks);
 	if (ret < 0)
 		return ret;

 	priv_data->num_clocks = ret;

 	ret = clk_bulk_prepare_enable(priv_data->num_clocks, priv_data->clks);
 	if (ret)
 		return ret;

 	ret = priv_data->pltfm_init(priv_data);
 	if (ret)
 		goto err_clk_put;

 	ret = of_platform_populate(np, NULL, NULL, dev);
 	if (ret)
 		goto err_clk_put;

 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
 	pm_suspend_ignore_children(dev, false);
 	pm_runtime_get_sync(dev);

 	return 0;

 err_clk_put:
 	clk_bulk_disable_unprepare(priv_data->num_clocks, priv_data->clks);

 	return ret;
 }

 static int dwc3_xlnx_remove(struct platform_device *pdev)
 {
 	struct dwc3_xlnx	*priv_data = platform_get_drvdata(pdev);
 	struct device		*dev = &pdev->dev;

 	of_platform_depopulate(dev);

 	clk_bulk_disable_unprepare(priv_data->num_clocks, priv_data->clks);
 	priv_data->num_clocks = 0;

 	pm_runtime_disable(dev);
 	pm_runtime_put_noidle(dev);
 	pm_runtime_set_suspended(dev);

 	return 0;
 }

 static int __maybe_unused dwc3_xlnx_suspend_common(struct device *dev)
 {
 	struct dwc3_xlnx *priv_data = dev_get_drvdata(dev);

 	clk_bulk_disable(priv_data->num_clocks, priv_data->clks);

 	return 0;
 }

 static int __maybe_unused dwc3_xlnx_resume_common(struct device *dev)
 {
 	struct dwc3_xlnx *priv_data = dev_get_drvdata(dev);

 	return clk_bulk_enable(priv_data->num_clocks, priv_data->clks);
 }

 static int __maybe_unused dwc3_xlnx_runtime_idle(struct device *dev)
 {
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_autosuspend(dev);

 	return 0;
 }

 static UNIVERSAL_DEV_PM_OPS(dwc3_xlnx_dev_pm_ops, dwc3_xlnx_suspend_common,
 			    dwc3_xlnx_resume_common, dwc3_xlnx_runtime_idle);

 static struct platform_driver dwc3_xlnx_driver = {
 	.probe		= dwc3_xlnx_probe,
 	.remove		= dwc3_xlnx_remove,
 	.driver		= {
 		.name		= "dwc3-xilinx",
 		.of_match_table	= dwc3_xlnx_of_match,
 		.pm		= &dwc3_xlnx_dev_pm_ops,
 	},
 };

 module_platform_driver(dwc3_xlnx_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Xilinx DWC3 controller specific glue driver");
 MODULE_AUTHOR("Manish Narani <manish.narani@xilinx.com>");
 MODULE_AUTHOR("Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* dwc3-xilinx.c - Xilinx DWC3 controller specific glue driver
	*
	* Authors: Manish Narani <manish.narani@xilinx.com>
	* Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/clk.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/dma-mapping.h>
	#include <linux/of_platform.h>
	#include <linux/pm_runtime.h>
	#include <linux/reset.h>
	#include <linux/of_address.h>
	#include <linux/delay.h>
	#include <linux/firmware/xlnx-zynqmp.h>
	#include <linux/io.h>

	#include <linux/phy/phy.h>

	/* USB phy reset mask register */
	#define XLNX_USB_PHY_RST_EN 0x001C
	#define XLNX_PHY_RST_MASK 0x1

	/* Xilinx USB 3.0 IP Register */
	#define XLNX_USB_TRAFFIC_ROUTE_CONFIG 0x005C
	#define XLNX_USB_TRAFFIC_ROUTE_FPD 0x1

	/* Versal USB Reset ID */
	#define VERSAL_USB_RESET_ID 0xC104036

	#define XLNX_USB_FPD_PIPE_CLK 0x7c
	#define PIPE_CLK_DESELECT 1
	#define PIPE_CLK_SELECT 0
	#define XLNX_USB_FPD_POWER_PRSNT 0x80
	#define FPD_POWER_PRSNT_OPTION BIT(0)

	struct dwc3_xlnx {
	int num_clocks;
	struct clk_bulk_data *clks;
	struct device *dev;
	void __iomem *regs;
	int (pltfm_init)(struct dwc3_xlnx data);
	};

	static void dwc3_xlnx_mask_phy_rst(struct dwc3_xlnx *priv_data, bool mask)
	{
	u32 reg;

	/*
	* Enable or disable ULPI PHY reset from USB Controller.
	* This does not actually reset the phy, but just controls
	* whether USB controller can or cannot reset ULPI PHY.
	*/
	reg = readl(priv_data->regs + XLNX_USB_PHY_RST_EN);

	if (mask)
	reg &= ~XLNX_PHY_RST_MASK;
	else
	reg \|= XLNX_PHY_RST_MASK;

	writel(reg, priv_data->regs + XLNX_USB_PHY_RST_EN);
	}

	static int dwc3_xlnx_init_versal(struct dwc3_xlnx *priv_data)
	{
	struct device *dev = priv_data->dev;
	int ret;

	dwc3_xlnx_mask_phy_rst(priv_data, false);

	/* Assert and De-assert reset */
	ret = zynqmp_pm_reset_assert(VERSAL_USB_RESET_ID,
	PM_RESET_ACTION_ASSERT);
	if (ret < 0) {
	dev_err_probe(dev, ret, "failed to assert Reset\n");
	return ret;
	}

	ret = zynqmp_pm_reset_assert(VERSAL_USB_RESET_ID,
	PM_RESET_ACTION_RELEASE);
	if (ret < 0) {
	dev_err_probe(dev, ret, "failed to De-assert Reset\n");
	return ret;
	}

	dwc3_xlnx_mask_phy_rst(priv_data, true);

	return 0;
	}

	static int dwc3_xlnx_init_zynqmp(struct dwc3_xlnx *priv_data)
	{
	struct device *dev = priv_data->dev;
	struct reset_control crst, hibrst, *apbrst;
	struct phy *usb3_phy;
	int ret;
	u32 reg;

	usb3_phy = devm_phy_optional_get(dev, "usb3-phy");
	if (IS_ERR(usb3_phy)) {
	ret = PTR_ERR(usb3_phy);
	dev_err_probe(dev, ret,
	"failed to get USB3 PHY\n");
	goto err;
	}

	/*
	* The following core resets are not required unless a USB3 PHY
	* is used, and the subsequent register settings are not required
	* unless a core reset is performed (they should be set properly
	* by the first-stage boot loader, but may be reverted by a core
	* reset). They may also break the configuration if USB3 is actually
	* in use but the usb3-phy entry is missing from the device tree.
	* Therefore, skip these operations in this case.
	*/
	if (!usb3_phy)
	goto skip_usb3_phy;

	crst = devm_reset_control_get_exclusive(dev, "usb_crst");
	if (IS_ERR(crst)) {
	ret = PTR_ERR(crst);
	dev_err_probe(dev, ret,
	"failed to get core reset signal\n");
	goto err;
	}

	hibrst = devm_reset_control_get_exclusive(dev, "usb_hibrst");
	if (IS_ERR(hibrst)) {
	ret = PTR_ERR(hibrst);
	dev_err_probe(dev, ret,
	"failed to get hibernation reset signal\n");
	goto err;
	}

	apbrst = devm_reset_control_get_exclusive(dev, "usb_apbrst");
	if (IS_ERR(apbrst)) {
	ret = PTR_ERR(apbrst);
	dev_err_probe(dev, ret,
	"failed to get APB reset signal\n");
	goto err;
	}

	ret = reset_control_assert(crst);
	if (ret < 0) {
	dev_err(dev, "Failed to assert core reset\n");
	goto err;
	}

	ret = reset_control_assert(hibrst);
	if (ret < 0) {
	dev_err(dev, "Failed to assert hibernation reset\n");
	goto err;
	}

	ret = reset_control_assert(apbrst);
	if (ret < 0) {
	dev_err(dev, "Failed to assert APB reset\n");
	goto err;
	}

	ret = phy_init(usb3_phy);
	if (ret < 0) {
	phy_exit(usb3_phy);
	goto err;
	}

	ret = reset_control_deassert(apbrst);
	if (ret < 0) {
	dev_err(dev, "Failed to release APB reset\n");
	goto err;
	}

	/* Set PIPE Power Present signal in FPD Power Present Register*/
	writel(FPD_POWER_PRSNT_OPTION, priv_data->regs + XLNX_USB_FPD_POWER_PRSNT);

	/* Set the PIPE Clock Select bit in FPD PIPE Clock register */
	writel(PIPE_CLK_SELECT, priv_data->regs + XLNX_USB_FPD_PIPE_CLK);

	ret = reset_control_deassert(crst);
	if (ret < 0) {
	dev_err(dev, "Failed to release core reset\n");
	goto err;
	}

	ret = reset_control_deassert(hibrst);
	if (ret < 0) {
	dev_err(dev, "Failed to release hibernation reset\n");
	goto err;
	}

	ret = phy_power_on(usb3_phy);
	if (ret < 0) {
	phy_exit(usb3_phy);
	goto err;
	}

	skip_usb3_phy:
	/*
	* This routes the USB DMA traffic to go through FPD path instead
	* of reaching DDR directly. This traffic routing is needed to
	* make SMMU and CCI work with USB DMA.
	*/
	if (of_dma_is_coherent(dev->of_node) \|\| device_iommu_mapped(dev)) {
	reg = readl(priv_data->regs + XLNX_USB_TRAFFIC_ROUTE_CONFIG);
	reg \|= XLNX_USB_TRAFFIC_ROUTE_FPD;
	writel(reg, priv_data->regs + XLNX_USB_TRAFFIC_ROUTE_CONFIG);
	}

	err:
	return ret;
	}

	static const struct of_device_id dwc3_xlnx_of_match[] = {
	{
	.compatible = "xlnx,zynqmp-dwc3",
	.data = &dwc3_xlnx_init_zynqmp,
	},
	{
	.compatible = "xlnx,versal-dwc3",
	.data = &dwc3_xlnx_init_versal,
	},
	{ /* Sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, dwc3_xlnx_of_match);

	static int dwc3_xlnx_probe(struct platform_device *pdev)
	{
	struct dwc3_xlnx *priv_data;
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	const struct of_device_id *match;
	void __iomem *regs;
	int ret;

	priv_data = devm_kzalloc(dev, sizeof(*priv_data), GFP_KERNEL);
	if (!priv_data)
	return -ENOMEM;

	regs = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(regs)) {
	ret = PTR_ERR(regs);
	dev_err_probe(dev, ret, "failed to map registers\n");
	return ret;
	}

	match = of_match_node(dwc3_xlnx_of_match, pdev->dev.of_node);

	priv_data->pltfm_init = match->data;
	priv_data->regs = regs;
	priv_data->dev = dev;

	platform_set_drvdata(pdev, priv_data);

	ret = devm_clk_bulk_get_all(priv_data->dev, &priv_data->clks);
	if (ret < 0)
	return ret;

	priv_data->num_clocks = ret;

	ret = clk_bulk_prepare_enable(priv_data->num_clocks, priv_data->clks);
	if (ret)
	return ret;

	ret = priv_data->pltfm_init(priv_data);
	if (ret)
	goto err_clk_put;

	ret = of_platform_populate(np, NULL, NULL, dev);
	if (ret)
	goto err_clk_put;

	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);
	pm_suspend_ignore_children(dev, false);
	pm_runtime_get_sync(dev);

	return 0;

	err_clk_put:
	clk_bulk_disable_unprepare(priv_data->num_clocks, priv_data->clks);

	return ret;
	}

	static int dwc3_xlnx_remove(struct platform_device *pdev)
	{
	struct dwc3_xlnx *priv_data = platform_get_drvdata(pdev);
	struct device *dev = &pdev->dev;

	of_platform_depopulate(dev);

	clk_bulk_disable_unprepare(priv_data->num_clocks, priv_data->clks);
	priv_data->num_clocks = 0;

	pm_runtime_disable(dev);
	pm_runtime_put_noidle(dev);
	pm_runtime_set_suspended(dev);

	return 0;
	}

	static int __maybe_unused dwc3_xlnx_suspend_common(struct device *dev)
	{
	struct dwc3_xlnx *priv_data = dev_get_drvdata(dev);

	clk_bulk_disable(priv_data->num_clocks, priv_data->clks);

	return 0;
	}

	static int __maybe_unused dwc3_xlnx_resume_common(struct device *dev)
	{
	struct dwc3_xlnx *priv_data = dev_get_drvdata(dev);

	return clk_bulk_enable(priv_data->num_clocks, priv_data->clks);
	}

	static int __maybe_unused dwc3_xlnx_runtime_idle(struct device *dev)
	{
	pm_runtime_mark_last_busy(dev);
	pm_runtime_autosuspend(dev);

	return 0;
	}

	static UNIVERSAL_DEV_PM_OPS(dwc3_xlnx_dev_pm_ops, dwc3_xlnx_suspend_common,
	dwc3_xlnx_resume_common, dwc3_xlnx_runtime_idle);

	static struct platform_driver dwc3_xlnx_driver = {
	.probe = dwc3_xlnx_probe,
	.remove = dwc3_xlnx_remove,
	.driver = {
	.name = "dwc3-xilinx",
	.of_match_table = dwc3_xlnx_of_match,
	.pm = &dwc3_xlnx_dev_pm_ops,
	},
	};

	module_platform_driver(dwc3_xlnx_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("Xilinx DWC3 controller specific glue driver");
	MODULE_AUTHOR("Manish Narani <manish.narani@xilinx.com>");
	MODULE_AUTHOR("Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>");