drivers/usb/dwc3/dwc3-exynos.c - third_party/linux - Git at Google

 /**
  * dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
  *
  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
  *		http://www.samsung.com
  *
  * Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
  *
  * 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/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/usb/otg.h>
 #include <linux/usb/usb_phy_generic.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/regulator/consumer.h>

 struct dwc3_exynos {
 	struct platform_device	*usb2_phy;
 	struct platform_device	*usb3_phy;
 	struct device		*dev;

 	struct clk		*clk;
 	struct clk		*susp_clk;
 	struct clk		*axius_clk;

 	struct regulator	*vdd33;
 	struct regulator	*vdd10;
 };

 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
 {
 	struct usb_phy_generic_platform_data pdata;
 	struct platform_device	*pdev;
 	int			ret;

 	memset(&pdata, 0x00, sizeof(pdata));

 	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
 	if (!pdev)
 		return -ENOMEM;

 	exynos->usb2_phy = pdev;
 	pdata.type = USB_PHY_TYPE_USB2;
 	pdata.gpio_reset = -1;

 	ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
 	if (ret)
 		goto err1;

 	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
 	if (!pdev) {
 		ret = -ENOMEM;
 		goto err1;
 	}

 	exynos->usb3_phy = pdev;
 	pdata.type = USB_PHY_TYPE_USB3;

 	ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
 	if (ret)
 		goto err2;

 	ret = platform_device_add(exynos->usb2_phy);
 	if (ret)
 		goto err2;

 	ret = platform_device_add(exynos->usb3_phy);
 	if (ret)
 		goto err3;

 	return 0;

 err3:
 	platform_device_del(exynos->usb2_phy);

 err2:
 	platform_device_put(exynos->usb3_phy);

 err1:
 	platform_device_put(exynos->usb2_phy);

 	return ret;
 }

 static int dwc3_exynos_remove_child(struct device *dev, void *unused)
 {
 	struct platform_device *pdev = to_platform_device(dev);

 	platform_device_unregister(pdev);

 	return 0;
 }

 static int dwc3_exynos_probe(struct platform_device *pdev)
 {
 	struct dwc3_exynos	*exynos;
 	struct device		*dev = &pdev->dev;
 	struct device_node	*node = dev->of_node;

 	int			ret;

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

 	/*
 	 * 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.
 	 */
 	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
 	if (ret)
 		return ret;

 	platform_set_drvdata(pdev, exynos);

 	exynos->dev	= dev;

 	exynos->clk = devm_clk_get(dev, "usbdrd30");
 	if (IS_ERR(exynos->clk)) {
 		dev_err(dev, "couldn't get clock\n");
 		return -EINVAL;
 	}
 	clk_prepare_enable(exynos->clk);

 	exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
 	if (IS_ERR(exynos->susp_clk)) {
 		dev_info(dev, "no suspend clk specified\n");
 		exynos->susp_clk = NULL;
 	}
 	clk_prepare_enable(exynos->susp_clk);

 	if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
 		exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
 		if (IS_ERR(exynos->axius_clk)) {
 			dev_err(dev, "no AXI UpScaler clk specified\n");
 			ret = -ENODEV;
 			goto axius_clk_err;
 		}
 		clk_prepare_enable(exynos->axius_clk);
 	} else {
 		exynos->axius_clk = NULL;
 	}

 	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
 	if (IS_ERR(exynos->vdd33)) {
 		ret = PTR_ERR(exynos->vdd33);
 		goto err2;
 	}
 	ret = regulator_enable(exynos->vdd33);
 	if (ret) {
 		dev_err(dev, "Failed to enable VDD33 supply\n");
 		goto err2;
 	}

 	exynos->vdd10 = devm_regulator_get(dev, "vdd10");
 	if (IS_ERR(exynos->vdd10)) {
 		ret = PTR_ERR(exynos->vdd10);
 		goto err3;
 	}
 	ret = regulator_enable(exynos->vdd10);
 	if (ret) {
 		dev_err(dev, "Failed to enable VDD10 supply\n");
 		goto err3;
 	}

 	ret = dwc3_exynos_register_phys(exynos);
 	if (ret) {
 		dev_err(dev, "couldn't register PHYs\n");
 		goto err4;
 	}

 	if (node) {
 		ret = of_platform_populate(node, NULL, NULL, dev);
 		if (ret) {
 			dev_err(dev, "failed to add dwc3 core\n");
 			goto err5;
 		}
 	} else {
 		dev_err(dev, "no device node, failed to add dwc3 core\n");
 		ret = -ENODEV;
 		goto err5;
 	}

 	return 0;

 err5:
 	platform_device_unregister(exynos->usb2_phy);
 	platform_device_unregister(exynos->usb3_phy);
 err4:
 	regulator_disable(exynos->vdd10);
 err3:
 	regulator_disable(exynos->vdd33);
 err2:
 	clk_disable_unprepare(exynos->axius_clk);
 axius_clk_err:
 	clk_disable_unprepare(exynos->susp_clk);
 	clk_disable_unprepare(exynos->clk);
 	return ret;
 }

 static int dwc3_exynos_remove(struct platform_device *pdev)
 {
 	struct dwc3_exynos	*exynos = platform_get_drvdata(pdev);

 	device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
 	platform_device_unregister(exynos->usb2_phy);
 	platform_device_unregister(exynos->usb3_phy);

 	clk_disable_unprepare(exynos->axius_clk);
 	clk_disable_unprepare(exynos->susp_clk);
 	clk_disable_unprepare(exynos->clk);

 	regulator_disable(exynos->vdd33);
 	regulator_disable(exynos->vdd10);

 	return 0;
 }

 static const struct of_device_id exynos_dwc3_match[] = {
 	{ .compatible = "samsung,exynos5250-dwusb3" },
 	{ .compatible = "samsung,exynos7-dwusb3" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, exynos_dwc3_match);

 #ifdef CONFIG_PM_SLEEP
 static int dwc3_exynos_suspend(struct device *dev)
 {
 	struct dwc3_exynos *exynos = dev_get_drvdata(dev);

 	clk_disable(exynos->axius_clk);
 	clk_disable(exynos->clk);

 	regulator_disable(exynos->vdd33);
 	regulator_disable(exynos->vdd10);

 	return 0;
 }

 static int dwc3_exynos_resume(struct device *dev)
 {
 	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
 	int ret;

 	ret = regulator_enable(exynos->vdd33);
 	if (ret) {
 		dev_err(dev, "Failed to enable VDD33 supply\n");
 		return ret;
 	}
 	ret = regulator_enable(exynos->vdd10);
 	if (ret) {
 		dev_err(dev, "Failed to enable VDD10 supply\n");
 		return ret;
 	}

 	clk_enable(exynos->clk);
 	clk_enable(exynos->axius_clk);

 	/* runtime set active to reflect active state. */
 	pm_runtime_disable(dev);
 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);

 	return 0;
 }

 static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
 };

 #define DEV_PM_OPS	(&dwc3_exynos_dev_pm_ops)
 #else
 #define DEV_PM_OPS	NULL
 #endif /* CONFIG_PM_SLEEP */

 static struct platform_driver dwc3_exynos_driver = {
 	.probe		= dwc3_exynos_probe,
 	.remove		= dwc3_exynos_remove,
 	.driver		= {
 		.name	= "exynos-dwc3",
 		.of_match_table = exynos_dwc3_match,
 		.pm	= DEV_PM_OPS,
 	},
 };

 module_platform_driver(dwc3_exynos_driver);

 MODULE_ALIAS("platform:exynos-dwc3");
 MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
	/**
	* dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
	*
	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	* http://www.samsung.com
	*
	* Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
	*
	* 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/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/usb/otg.h>
	#include <linux/usb/usb_phy_generic.h>
	#include <linux/of.h>
	#include <linux/of_platform.h>
	#include <linux/regulator/consumer.h>

	struct dwc3_exynos {
	struct platform_device *usb2_phy;
	struct platform_device *usb3_phy;
	struct device *dev;

	struct clk *clk;
	struct clk *susp_clk;
	struct clk *axius_clk;

	struct regulator *vdd33;
	struct regulator *vdd10;
	};

	static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
	{
	struct usb_phy_generic_platform_data pdata;
	struct platform_device *pdev;
	int ret;

	memset(&pdata, 0x00, sizeof(pdata));

	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
	if (!pdev)
	return -ENOMEM;

	exynos->usb2_phy = pdev;
	pdata.type = USB_PHY_TYPE_USB2;
	pdata.gpio_reset = -1;

	ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
	if (ret)
	goto err1;

	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
	if (!pdev) {
	ret = -ENOMEM;
	goto err1;
	}

	exynos->usb3_phy = pdev;
	pdata.type = USB_PHY_TYPE_USB3;

	ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
	if (ret)
	goto err2;

	ret = platform_device_add(exynos->usb2_phy);
	if (ret)
	goto err2;

	ret = platform_device_add(exynos->usb3_phy);
	if (ret)
	goto err3;

	return 0;

	err3:
	platform_device_del(exynos->usb2_phy);

	err2:
	platform_device_put(exynos->usb3_phy);

	err1:
	platform_device_put(exynos->usb2_phy);

	return ret;
	}

	static int dwc3_exynos_remove_child(struct device dev, void unused)
	{
	struct platform_device *pdev = to_platform_device(dev);

	platform_device_unregister(pdev);

	return 0;
	}

	static int dwc3_exynos_probe(struct platform_device *pdev)
	{
	struct dwc3_exynos *exynos;
	struct device *dev = &pdev->dev;
	struct device_node *node = dev->of_node;

	int ret;

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

	/*
	* 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.
	*/
	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
	if (ret)
	return ret;

	platform_set_drvdata(pdev, exynos);

	exynos->dev = dev;

	exynos->clk = devm_clk_get(dev, "usbdrd30");
	if (IS_ERR(exynos->clk)) {
	dev_err(dev, "couldn't get clock\n");
	return -EINVAL;
	}
	clk_prepare_enable(exynos->clk);

	exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
	if (IS_ERR(exynos->susp_clk)) {
	dev_info(dev, "no suspend clk specified\n");
	exynos->susp_clk = NULL;
	}
	clk_prepare_enable(exynos->susp_clk);

	if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
	exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
	if (IS_ERR(exynos->axius_clk)) {
	dev_err(dev, "no AXI UpScaler clk specified\n");
	ret = -ENODEV;
	goto axius_clk_err;
	}
	clk_prepare_enable(exynos->axius_clk);
	} else {
	exynos->axius_clk = NULL;
	}

	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
	if (IS_ERR(exynos->vdd33)) {
	ret = PTR_ERR(exynos->vdd33);
	goto err2;
	}
	ret = regulator_enable(exynos->vdd33);
	if (ret) {
	dev_err(dev, "Failed to enable VDD33 supply\n");
	goto err2;
	}

	exynos->vdd10 = devm_regulator_get(dev, "vdd10");
	if (IS_ERR(exynos->vdd10)) {
	ret = PTR_ERR(exynos->vdd10);
	goto err3;
	}
	ret = regulator_enable(exynos->vdd10);
	if (ret) {
	dev_err(dev, "Failed to enable VDD10 supply\n");
	goto err3;
	}

	ret = dwc3_exynos_register_phys(exynos);
	if (ret) {
	dev_err(dev, "couldn't register PHYs\n");
	goto err4;
	}

	if (node) {
	ret = of_platform_populate(node, NULL, NULL, dev);
	if (ret) {
	dev_err(dev, "failed to add dwc3 core\n");
	goto err5;
	}
	} else {
	dev_err(dev, "no device node, failed to add dwc3 core\n");
	ret = -ENODEV;
	goto err5;
	}

	return 0;

	err5:
	platform_device_unregister(exynos->usb2_phy);
	platform_device_unregister(exynos->usb3_phy);
	err4:
	regulator_disable(exynos->vdd10);
	err3:
	regulator_disable(exynos->vdd33);
	err2:
	clk_disable_unprepare(exynos->axius_clk);
	axius_clk_err:
	clk_disable_unprepare(exynos->susp_clk);
	clk_disable_unprepare(exynos->clk);
	return ret;
	}

	static int dwc3_exynos_remove(struct platform_device *pdev)
	{
	struct dwc3_exynos *exynos = platform_get_drvdata(pdev);

	device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
	platform_device_unregister(exynos->usb2_phy);
	platform_device_unregister(exynos->usb3_phy);

	clk_disable_unprepare(exynos->axius_clk);
	clk_disable_unprepare(exynos->susp_clk);
	clk_disable_unprepare(exynos->clk);

	regulator_disable(exynos->vdd33);
	regulator_disable(exynos->vdd10);

	return 0;
	}

	static const struct of_device_id exynos_dwc3_match[] = {
	{ .compatible = "samsung,exynos5250-dwusb3" },
	{ .compatible = "samsung,exynos7-dwusb3" },
	{},
	};
	MODULE_DEVICE_TABLE(of, exynos_dwc3_match);

	#ifdef CONFIG_PM_SLEEP
	static int dwc3_exynos_suspend(struct device *dev)
	{
	struct dwc3_exynos *exynos = dev_get_drvdata(dev);

	clk_disable(exynos->axius_clk);
	clk_disable(exynos->clk);

	regulator_disable(exynos->vdd33);
	regulator_disable(exynos->vdd10);

	return 0;
	}

	static int dwc3_exynos_resume(struct device *dev)
	{
	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
	int ret;

	ret = regulator_enable(exynos->vdd33);
	if (ret) {
	dev_err(dev, "Failed to enable VDD33 supply\n");
	return ret;
	}
	ret = regulator_enable(exynos->vdd10);
	if (ret) {
	dev_err(dev, "Failed to enable VDD10 supply\n");
	return ret;
	}

	clk_enable(exynos->clk);
	clk_enable(exynos->axius_clk);

	/* runtime set active to reflect active state. */
	pm_runtime_disable(dev);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);

	return 0;
	}

	static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
	};

	#define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
	#else
	#define DEV_PM_OPS NULL
	#endif /* CONFIG_PM_SLEEP */

	static struct platform_driver dwc3_exynos_driver = {
	.probe = dwc3_exynos_probe,
	.remove = dwc3_exynos_remove,
	.driver = {
	.name = "exynos-dwc3",
	.of_match_table = exynos_dwc3_match,
	.pm = DEV_PM_OPS,
	},
	};

	module_platform_driver(dwc3_exynos_driver);

	MODULE_ALIAS("platform:exynos-dwc3");
	MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");