drivers/usb/host/ehci-exynos.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Samsung Exynos USB HOST EHCI Controller
  *
  * Copyright (C) 2011 Samsung Electronics Co.Ltd
  * Author: Jingoo Han <jg1.han@samsung.com>
  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
  */

 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/gpio/consumer.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/usb.h>
 #include <linux/usb/hcd.h>

 #include "ehci.h"

 #define DRIVER_DESC "EHCI Exynos driver"

 #define EHCI_INSNREG00(base)			(base + 0x90)
 #define EHCI_INSNREG00_ENA_INCR16		(0x1 << 25)
 #define EHCI_INSNREG00_ENA_INCR8		(0x1 << 24)
 #define EHCI_INSNREG00_ENA_INCR4		(0x1 << 23)
 #define EHCI_INSNREG00_ENA_INCRX_ALIGN		(0x1 << 22)
 #define EHCI_INSNREG00_ENABLE_DMA_BURST	\
 	(EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 |	\
 	 EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)

 static struct hc_driver __read_mostly exynos_ehci_hc_driver;

 #define PHY_NUMBER 3

 struct exynos_ehci_hcd {
 	struct clk *clk;
 	struct device_node *of_node;
 	struct phy *phy[PHY_NUMBER];
 	bool legacy_phy;
 };

 #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)

 static int exynos_ehci_get_phy(struct device *dev,
 				struct exynos_ehci_hcd *exynos_ehci)
 {
 	struct phy *phy;
 	int phy_number, num_phys;
 	int ret;

 	/* Get PHYs for the controller */
 	num_phys = of_count_phandle_with_args(dev->of_node, "phys",
 					      "#phy-cells");
 	for (phy_number = 0; phy_number < num_phys; phy_number++) {
 		phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number);
 		if (IS_ERR(phy))
 			return PTR_ERR(phy);
 		exynos_ehci->phy[phy_number] = phy;
 	}
 	if (num_phys > 0)
 		return 0;

 	/* Get PHYs using legacy bindings */
 	for_each_available_child_of_node_scoped(dev->of_node, child) {
 		ret = of_property_read_u32(child, "reg", &phy_number);
 		if (ret) {
 			dev_err(dev, "Failed to parse device tree\n");
 			return ret;
 		}

 		if (phy_number >= PHY_NUMBER) {
 			dev_err(dev, "Invalid number of PHYs\n");
 			return -EINVAL;
 		}

 		phy = devm_of_phy_optional_get(dev, child, NULL);
 		exynos_ehci->phy[phy_number] = phy;
 		if (IS_ERR(phy))
 			return PTR_ERR(phy);
 	}

 	exynos_ehci->legacy_phy = true;
 	return 0;
 }

 static int exynos_ehci_phy_enable(struct device *dev)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
 	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 	int i;
 	int ret = 0;

 	for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
 		ret = phy_power_on(exynos_ehci->phy[i]);
 	if (ret)
 		for (i--; i >= 0; i--)
 			phy_power_off(exynos_ehci->phy[i]);

 	return ret;
 }

 static void exynos_ehci_phy_disable(struct device *dev)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
 	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 	int i;

 	for (i = 0; i < PHY_NUMBER; i++)
 		phy_power_off(exynos_ehci->phy[i]);
 }

 static void exynos_setup_vbus_gpio(struct device *dev)
 {
 	struct gpio_desc *gpio;
 	int err;

 	gpio = devm_gpiod_get_optional(dev, "samsung,vbus", GPIOD_OUT_HIGH);
 	err = PTR_ERR_OR_ZERO(gpio);
 	if (err)
 		dev_err(dev, "can't request ehci vbus gpio: %d\n", err);
 }

 static int exynos_ehci_probe(struct platform_device *pdev)
 {
 	struct exynos_ehci_hcd *exynos_ehci;
 	struct usb_hcd *hcd;
 	struct ehci_hcd *ehci;
 	struct resource *res;
 	int irq;
 	int err;

 	/*
 	 * Right now device-tree probed devices don't get dma_mask set.
 	 * Since shared usb code relies on it, set it here for now.
 	 * Once we move to full device tree support this will vanish off.
 	 */
 	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 	if (err)
 		return err;

 	exynos_setup_vbus_gpio(&pdev->dev);

 	hcd = usb_create_hcd(&exynos_ehci_hc_driver,
 			     &pdev->dev, dev_name(&pdev->dev));
 	if (!hcd) {
 		dev_err(&pdev->dev, "Unable to create HCD\n");
 		return -ENOMEM;
 	}
 	exynos_ehci = to_exynos_ehci(hcd);

 	err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
 	if (err)
 		goto fail_io;

 	exynos_ehci->clk = devm_clk_get_enabled(&pdev->dev, "usbhost");

 	if (IS_ERR(exynos_ehci->clk)) {
 		dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 		err = PTR_ERR(exynos_ehci->clk);
 		goto fail_io;
 	}

 	hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(hcd->regs)) {
 		err = PTR_ERR(hcd->regs);
 		goto fail_io;
 	}

 	hcd->rsrc_start = res->start;
 	hcd->rsrc_len = resource_size(res);

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		err = irq;
 		goto fail_io;
 	}

 	err = exynos_ehci_phy_enable(&pdev->dev);
 	if (err) {
 		dev_err(&pdev->dev, "Failed to enable USB phy\n");
 		goto fail_io;
 	}

 	ehci = hcd_to_ehci(hcd);
 	ehci->caps = hcd->regs;

 	/*
 	 * Workaround: reset of_node pointer to avoid conflict between legacy
 	 * Exynos EHCI port subnodes and generic USB device bindings
 	 */
 	exynos_ehci->of_node = pdev->dev.of_node;
 	if (exynos_ehci->legacy_phy)
 		pdev->dev.of_node = NULL;

 	/* DMA burst Enable */
 	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));

 	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 	if (err) {
 		dev_err(&pdev->dev, "Failed to add USB HCD\n");
 		goto fail_add_hcd;
 	}
 	device_wakeup_enable(hcd->self.controller);

 	platform_set_drvdata(pdev, hcd);

 	return 0;

 fail_add_hcd:
 	exynos_ehci_phy_disable(&pdev->dev);
 	pdev->dev.of_node = exynos_ehci->of_node;
 fail_io:
 	usb_put_hcd(hcd);
 	return err;
 }

 static void exynos_ehci_remove(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
 	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);

 	pdev->dev.of_node = exynos_ehci->of_node;

 	usb_remove_hcd(hcd);

 	exynos_ehci_phy_disable(&pdev->dev);

 	usb_put_hcd(hcd);
 }

 static int exynos_ehci_suspend(struct device *dev)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
 	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);

 	bool do_wakeup = device_may_wakeup(dev);
 	int rc;

 	rc = ehci_suspend(hcd, do_wakeup);
 	if (rc)
 		return rc;

 	exynos_ehci_phy_disable(dev);

 	clk_disable_unprepare(exynos_ehci->clk);

 	return rc;
 }

 static int exynos_ehci_resume(struct device *dev)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
 	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 	int ret;

 	ret = clk_prepare_enable(exynos_ehci->clk);
 	if (ret)
 		return ret;

 	ret = exynos_ehci_phy_enable(dev);
 	if (ret) {
 		dev_err(dev, "Failed to enable USB phy\n");
 		clk_disable_unprepare(exynos_ehci->clk);
 		return ret;
 	}

 	/* DMA burst Enable */
 	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));

 	ehci_resume(hcd, false);
 	return 0;
 }

 static DEFINE_SIMPLE_DEV_PM_OPS(exynos_ehci_pm_ops,
 				exynos_ehci_suspend, exynos_ehci_resume);

 #ifdef CONFIG_OF
 static const struct of_device_id exynos_ehci_match[] = {
 	{ .compatible = "samsung,exynos4210-ehci" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, exynos_ehci_match);
 #endif

 static struct platform_driver exynos_ehci_driver = {
 	.probe		= exynos_ehci_probe,
 	.remove_new	= exynos_ehci_remove,
 	.shutdown	= usb_hcd_platform_shutdown,
 	.driver = {
 		.name	= "exynos-ehci",
 		.pm	= pm_ptr(&exynos_ehci_pm_ops),
 		.of_match_table = of_match_ptr(exynos_ehci_match),
 	}
 };
 static const struct ehci_driver_overrides exynos_overrides __initconst = {
 	.extra_priv_size = sizeof(struct exynos_ehci_hcd),
 };

 static int __init ehci_exynos_init(void)
 {
 	if (usb_disabled())
 		return -ENODEV;

 	ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
 	return platform_driver_register(&exynos_ehci_driver);
 }
 module_init(ehci_exynos_init);

 static void __exit ehci_exynos_cleanup(void)
 {
 	platform_driver_unregister(&exynos_ehci_driver);
 }
 module_exit(ehci_exynos_cleanup);

 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_ALIAS("platform:exynos-ehci");
 MODULE_AUTHOR("Jingoo Han");
 MODULE_AUTHOR("Joonyoung Shim");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Samsung Exynos USB HOST EHCI Controller
	*
	* Copyright (C) 2011 Samsung Electronics Co.Ltd
	* Author: Jingoo Han <jg1.han@samsung.com>
	* Author: Joonyoung Shim <jy0922.shim@samsung.com>
	*/

	#include <linux/clk.h>
	#include <linux/dma-mapping.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/gpio/consumer.h>
	#include <linux/phy/phy.h>
	#include <linux/platform_device.h>
	#include <linux/usb.h>
	#include <linux/usb/hcd.h>

	#include "ehci.h"

	#define DRIVER_DESC "EHCI Exynos driver"

	#define EHCI_INSNREG00(base) (base + 0x90)
	#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25)
	#define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24)
	#define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23)
	#define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22)
	#define EHCI_INSNREG00_ENABLE_DMA_BURST \
	(EHCI_INSNREG00_ENA_INCR16 \| EHCI_INSNREG00_ENA_INCR8 \| \
	EHCI_INSNREG00_ENA_INCR4 \| EHCI_INSNREG00_ENA_INCRX_ALIGN)

	static struct hc_driver __read_mostly exynos_ehci_hc_driver;

	#define PHY_NUMBER 3

	struct exynos_ehci_hcd {
	struct clk *clk;
	struct device_node *of_node;
	struct phy *phy[PHY_NUMBER];
	bool legacy_phy;
	};

	#define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)

	static int exynos_ehci_get_phy(struct device *dev,
	struct exynos_ehci_hcd *exynos_ehci)
	{
	struct phy *phy;
	int phy_number, num_phys;
	int ret;

	/* Get PHYs for the controller */
	num_phys = of_count_phandle_with_args(dev->of_node, "phys",
	"#phy-cells");
	for (phy_number = 0; phy_number < num_phys; phy_number++) {
	phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number);
	if (IS_ERR(phy))
	return PTR_ERR(phy);
	exynos_ehci->phy[phy_number] = phy;
	}
	if (num_phys > 0)
	return 0;

	/* Get PHYs using legacy bindings */
	for_each_available_child_of_node_scoped(dev->of_node, child) {
	ret = of_property_read_u32(child, "reg", &phy_number);
	if (ret) {
	dev_err(dev, "Failed to parse device tree\n");
	return ret;
	}

	if (phy_number >= PHY_NUMBER) {
	dev_err(dev, "Invalid number of PHYs\n");
	return -EINVAL;
	}

	phy = devm_of_phy_optional_get(dev, child, NULL);
	exynos_ehci->phy[phy_number] = phy;
	if (IS_ERR(phy))
	return PTR_ERR(phy);
	}

	exynos_ehci->legacy_phy = true;
	return 0;
	}

	static int exynos_ehci_phy_enable(struct device *dev)
	{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
	int i;
	int ret = 0;

	for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
	ret = phy_power_on(exynos_ehci->phy[i]);
	if (ret)
	for (i--; i >= 0; i--)
	phy_power_off(exynos_ehci->phy[i]);

	return ret;
	}

	static void exynos_ehci_phy_disable(struct device *dev)
	{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
	int i;

	for (i = 0; i < PHY_NUMBER; i++)
	phy_power_off(exynos_ehci->phy[i]);
	}

	static void exynos_setup_vbus_gpio(struct device *dev)
	{
	struct gpio_desc *gpio;
	int err;

	gpio = devm_gpiod_get_optional(dev, "samsung,vbus", GPIOD_OUT_HIGH);
	err = PTR_ERR_OR_ZERO(gpio);
	if (err)
	dev_err(dev, "can't request ehci vbus gpio: %d\n", err);
	}

	static int exynos_ehci_probe(struct platform_device *pdev)
	{
	struct exynos_ehci_hcd *exynos_ehci;
	struct usb_hcd *hcd;
	struct ehci_hcd *ehci;
	struct resource *res;
	int irq;
	int err;

	/*
	* Right now device-tree probed devices don't get dma_mask set.
	* Since shared usb code relies on it, set it here for now.
	* Once we move to full device tree support this will vanish off.
	*/
	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
	if (err)
	return err;

	exynos_setup_vbus_gpio(&pdev->dev);

	hcd = usb_create_hcd(&exynos_ehci_hc_driver,
	&pdev->dev, dev_name(&pdev->dev));
	if (!hcd) {
	dev_err(&pdev->dev, "Unable to create HCD\n");
	return -ENOMEM;
	}
	exynos_ehci = to_exynos_ehci(hcd);

	err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
	if (err)
	goto fail_io;

	exynos_ehci->clk = devm_clk_get_enabled(&pdev->dev, "usbhost");

	if (IS_ERR(exynos_ehci->clk)) {
	dev_err(&pdev->dev, "Failed to get usbhost clock\n");
	err = PTR_ERR(exynos_ehci->clk);
	goto fail_io;
	}

	hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
	if (IS_ERR(hcd->regs)) {
	err = PTR_ERR(hcd->regs);
	goto fail_io;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
	err = irq;
	goto fail_io;
	}

	err = exynos_ehci_phy_enable(&pdev->dev);
	if (err) {
	dev_err(&pdev->dev, "Failed to enable USB phy\n");
	goto fail_io;
	}

	ehci = hcd_to_ehci(hcd);
	ehci->caps = hcd->regs;

	/*
	* Workaround: reset of_node pointer to avoid conflict between legacy
	* Exynos EHCI port subnodes and generic USB device bindings
	*/
	exynos_ehci->of_node = pdev->dev.of_node;
	if (exynos_ehci->legacy_phy)
	pdev->dev.of_node = NULL;

	/* DMA burst Enable */
	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));

	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (err) {
	dev_err(&pdev->dev, "Failed to add USB HCD\n");
	goto fail_add_hcd;
	}
	device_wakeup_enable(hcd->self.controller);

	platform_set_drvdata(pdev, hcd);

	return 0;

	fail_add_hcd:
	exynos_ehci_phy_disable(&pdev->dev);
	pdev->dev.of_node = exynos_ehci->of_node;
	fail_io:
	usb_put_hcd(hcd);
	return err;
	}

	static void exynos_ehci_remove(struct platform_device *pdev)
	{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);

	pdev->dev.of_node = exynos_ehci->of_node;

	usb_remove_hcd(hcd);

	exynos_ehci_phy_disable(&pdev->dev);

	usb_put_hcd(hcd);
	}

	static int exynos_ehci_suspend(struct device *dev)
	{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);

	bool do_wakeup = device_may_wakeup(dev);
	int rc;

	rc = ehci_suspend(hcd, do_wakeup);
	if (rc)
	return rc;

	exynos_ehci_phy_disable(dev);

	clk_disable_unprepare(exynos_ehci->clk);

	return rc;
	}

	static int exynos_ehci_resume(struct device *dev)
	{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
	int ret;

	ret = clk_prepare_enable(exynos_ehci->clk);
	if (ret)
	return ret;

	ret = exynos_ehci_phy_enable(dev);
	if (ret) {
	dev_err(dev, "Failed to enable USB phy\n");
	clk_disable_unprepare(exynos_ehci->clk);
	return ret;
	}

	/* DMA burst Enable */
	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));

	ehci_resume(hcd, false);
	return 0;
	}

	static DEFINE_SIMPLE_DEV_PM_OPS(exynos_ehci_pm_ops,
	exynos_ehci_suspend, exynos_ehci_resume);

	#ifdef CONFIG_OF
	static const struct of_device_id exynos_ehci_match[] = {
	{ .compatible = "samsung,exynos4210-ehci" },
	{},
	};
	MODULE_DEVICE_TABLE(of, exynos_ehci_match);
	#endif

	static struct platform_driver exynos_ehci_driver = {
	.probe = exynos_ehci_probe,
	.remove_new = exynos_ehci_remove,
	.shutdown = usb_hcd_platform_shutdown,
	.driver = {
	.name = "exynos-ehci",
	.pm = pm_ptr(&exynos_ehci_pm_ops),
	.of_match_table = of_match_ptr(exynos_ehci_match),
	}
	};
	static const struct ehci_driver_overrides exynos_overrides __initconst = {
	.extra_priv_size = sizeof(struct exynos_ehci_hcd),
	};

	static int __init ehci_exynos_init(void)
	{
	if (usb_disabled())
	return -ENODEV;

	ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
	return platform_driver_register(&exynos_ehci_driver);
	}
	module_init(ehci_exynos_init);

	static void __exit ehci_exynos_cleanup(void)
	{
	platform_driver_unregister(&exynos_ehci_driver);
	}
	module_exit(ehci_exynos_cleanup);

	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_ALIAS("platform:exynos-ehci");
	MODULE_AUTHOR("Jingoo Han");
	MODULE_AUTHOR("Joonyoung Shim");
	MODULE_LICENSE("GPL v2");