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

 /*
  * 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>
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
  * option) any later version.
  *
  */

 #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/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/usb/phy.h>
 #include <linux/usb/samsung_usb_phy.h>
 #include <linux/usb.h>
 #include <linux/usb/hcd.h>
 #include <linux/usb/otg.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 const char hcd_name[] = "ehci-exynos";
 static struct hc_driver __read_mostly exynos_ehci_hc_driver;

 struct exynos_ehci_hcd {
 	struct clk *clk;
 	struct usb_phy *phy;
 	struct usb_otg *otg;
 };

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

 static void exynos_setup_vbus_gpio(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	int err;
 	int gpio;

 	if (!dev->of_node)
 		return;

 	gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
 	if (!gpio_is_valid(gpio))
 		return;

 	err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
 				    "ehci_vbus_gpio");
 	if (err)
 		dev_err(dev, "can't request ehci vbus gpio %d", gpio);
 }

 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;
 	struct usb_phy *phy;
 	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);

 	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);

 	if (of_device_is_compatible(pdev->dev.of_node,
 					"samsung,exynos5440-ehci"))
 		goto skip_phy;

 	phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 	if (IS_ERR(phy)) {
 		usb_put_hcd(hcd);
 		dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
 		return -EPROBE_DEFER;
 	} else {
 		exynos_ehci->phy = phy;
 		exynos_ehci->otg = phy->otg;
 	}

 skip_phy:

 	exynos_ehci->clk = devm_clk_get(&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_clk;
 	}

 	err = clk_prepare_enable(exynos_ehci->clk);
 	if (err)
 		goto fail_clk;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(&pdev->dev, "Failed to get I/O memory\n");
 		err = -ENXIO;
 		goto fail_io;
 	}

 	hcd->rsrc_start = res->start;
 	hcd->rsrc_len = resource_size(res);
 	hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
 	if (!hcd->regs) {
 		dev_err(&pdev->dev, "Failed to remap I/O memory\n");
 		err = -ENOMEM;
 		goto fail_io;
 	}

 	irq = platform_get_irq(pdev, 0);
 	if (!irq) {
 		dev_err(&pdev->dev, "Failed to get IRQ\n");
 		err = -ENODEV;
 		goto fail_io;
 	}

 	if (exynos_ehci->otg)
 		exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);

 	if (exynos_ehci->phy)
 		usb_phy_init(exynos_ehci->phy);

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

 	/* 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:
 	if (exynos_ehci->phy)
 		usb_phy_shutdown(exynos_ehci->phy);
 fail_io:
 	clk_disable_unprepare(exynos_ehci->clk);
 fail_clk:
 	usb_put_hcd(hcd);
 	return err;
 }

 static int 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);

 	usb_remove_hcd(hcd);

 	if (exynos_ehci->otg)
 		exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);

 	if (exynos_ehci->phy)
 		usb_phy_shutdown(exynos_ehci->phy);

 	clk_disable_unprepare(exynos_ehci->clk);

 	usb_put_hcd(hcd);

 	return 0;
 }

 #ifdef CONFIG_PM
 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;

 	if (exynos_ehci->otg)
 		exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);

 	if (exynos_ehci->phy)
 		usb_phy_shutdown(exynos_ehci->phy);

 	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);

 	clk_prepare_enable(exynos_ehci->clk);

 	if (exynos_ehci->otg)
 		exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);

 	if (exynos_ehci->phy)
 		usb_phy_init(exynos_ehci->phy);

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

 	ehci_resume(hcd, false);
 	return 0;
 }
 #else
 #define exynos_ehci_suspend	NULL
 #define exynos_ehci_resume	NULL
 #endif

 static const struct dev_pm_ops exynos_ehci_pm_ops = {
 	.suspend	= exynos_ehci_suspend,
 	.resume		= exynos_ehci_resume,
 };

 #ifdef CONFIG_OF
 static const struct of_device_id exynos_ehci_match[] = {
 	{ .compatible = "samsung,exynos4210-ehci" },
 	{ .compatible = "samsung,exynos5440-ehci" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, exynos_ehci_match);
 #endif

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

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

 	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 	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");
	/*
	* 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>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	*/

	#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/of_gpio.h>
	#include <linux/platform_device.h>
	#include <linux/usb/phy.h>
	#include <linux/usb/samsung_usb_phy.h>
	#include <linux/usb.h>
	#include <linux/usb/hcd.h>
	#include <linux/usb/otg.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 const char hcd_name[] = "ehci-exynos";
	static struct hc_driver __read_mostly exynos_ehci_hc_driver;

	struct exynos_ehci_hcd {
	struct clk *clk;
	struct usb_phy *phy;
	struct usb_otg *otg;
	};

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

	static void exynos_setup_vbus_gpio(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	int err;
	int gpio;

	if (!dev->of_node)
	return;

	gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);
	if (!gpio_is_valid(gpio))
	return;

	err = devm_gpio_request_one(dev, gpio, GPIOF_OUT_INIT_HIGH,
	"ehci_vbus_gpio");
	if (err)
	dev_err(dev, "can't request ehci vbus gpio %d", gpio);
	}

	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;
	struct usb_phy *phy;
	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);

	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);

	if (of_device_is_compatible(pdev->dev.of_node,
	"samsung,exynos5440-ehci"))
	goto skip_phy;

	phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
	if (IS_ERR(phy)) {
	usb_put_hcd(hcd);
	dev_warn(&pdev->dev, "no platform data or transceiver defined\n");
	return -EPROBE_DEFER;
	} else {
	exynos_ehci->phy = phy;
	exynos_ehci->otg = phy->otg;
	}

	skip_phy:

	exynos_ehci->clk = devm_clk_get(&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_clk;
	}

	err = clk_prepare_enable(exynos_ehci->clk);
	if (err)
	goto fail_clk;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
	dev_err(&pdev->dev, "Failed to get I/O memory\n");
	err = -ENXIO;
	goto fail_io;
	}

	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);
	hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len);
	if (!hcd->regs) {
	dev_err(&pdev->dev, "Failed to remap I/O memory\n");
	err = -ENOMEM;
	goto fail_io;
	}

	irq = platform_get_irq(pdev, 0);
	if (!irq) {
	dev_err(&pdev->dev, "Failed to get IRQ\n");
	err = -ENODEV;
	goto fail_io;
	}

	if (exynos_ehci->otg)
	exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);

	if (exynos_ehci->phy)
	usb_phy_init(exynos_ehci->phy);

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

	/* 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:
	if (exynos_ehci->phy)
	usb_phy_shutdown(exynos_ehci->phy);
	fail_io:
	clk_disable_unprepare(exynos_ehci->clk);
	fail_clk:
	usb_put_hcd(hcd);
	return err;
	}

	static int 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);

	usb_remove_hcd(hcd);

	if (exynos_ehci->otg)
	exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);

	if (exynos_ehci->phy)
	usb_phy_shutdown(exynos_ehci->phy);

	clk_disable_unprepare(exynos_ehci->clk);

	usb_put_hcd(hcd);

	return 0;
	}

	#ifdef CONFIG_PM
	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;

	if (exynos_ehci->otg)
	exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);

	if (exynos_ehci->phy)
	usb_phy_shutdown(exynos_ehci->phy);

	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);

	clk_prepare_enable(exynos_ehci->clk);

	if (exynos_ehci->otg)
	exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);

	if (exynos_ehci->phy)
	usb_phy_init(exynos_ehci->phy);

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

	ehci_resume(hcd, false);
	return 0;
	}
	#else
	#define exynos_ehci_suspend NULL
	#define exynos_ehci_resume NULL
	#endif

	static const struct dev_pm_ops exynos_ehci_pm_ops = {
	.suspend = exynos_ehci_suspend,
	.resume = exynos_ehci_resume,
	};

	#ifdef CONFIG_OF
	static const struct of_device_id exynos_ehci_match[] = {
	{ .compatible = "samsung,exynos4210-ehci" },
	{ .compatible = "samsung,exynos5440-ehci" },
	{},
	};
	MODULE_DEVICE_TABLE(of, exynos_ehci_match);
	#endif

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

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

	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
	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");