drivers/usb/phy/omap-usb2.c - manifest_repos/salami - Git at Google

 /*
  * omap-usb2.c - USB PHY, talking to musb controller in OMAP.
  *
  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.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.
  *
  * Author: Kishon Vijay Abraham I <kishon@ti.com>
  *
  * 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/platform_device.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/io.h>
 #include <linux/usb/omap_usb.h>
 #include <linux/usb/phy_companion.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/pm_runtime.h>
 #include <linux/delay.h>

 /**
  * omap_usb2_set_comparator - links the comparator present in the sytem with
  *	this phy
  * @comparator - the companion phy(comparator) for this phy
  *
  * The phy companion driver should call this API passing the phy_companion
  * filled with set_vbus and start_srp to be used by usb phy.
  *
  * For use by phy companion driver
  */
 int omap_usb2_set_comparator(struct phy_companion *comparator)
 {
 	struct omap_usb	*phy;
 	struct usb_phy	*x = usb_get_phy(USB_PHY_TYPE_USB2);

 	if (IS_ERR(x))
 		return -ENODEV;

 	phy = phy_to_omapusb(x);
 	phy->comparator = comparator;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);

 /**
  * omap_usb_phy_power - power on/off the phy using control module reg
  * @phy: struct omap_usb *
  * @on: 0 or 1, based on powering on or off the PHY
  *
  * XXX: Remove this function once control module driver gets merged
  */
 static void omap_usb_phy_power(struct omap_usb *phy, int on)
 {
 	u32 val;

 	if (on) {
 		val = readl(phy->control_dev);
 		if (val & PHY_PD) {
 			writel(~PHY_PD, phy->control_dev);
 			/* XXX: add proper documentation for this delay */
 			mdelay(200);
 		}
 	} else {
 		writel(PHY_PD, phy->control_dev);
 	}
 }

 static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
 {
 	struct omap_usb *phy = phy_to_omapusb(otg->phy);

 	if (!phy->comparator)
 		return -ENODEV;

 	return phy->comparator->set_vbus(phy->comparator, enabled);
 }

 static int omap_usb_start_srp(struct usb_otg *otg)
 {
 	struct omap_usb *phy = phy_to_omapusb(otg->phy);

 	if (!phy->comparator)
 		return -ENODEV;

 	return phy->comparator->start_srp(phy->comparator);
 }

 static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
 {
 	struct usb_phy	*phy = otg->phy;

 	otg->host = host;
 	if (!host)
 		phy->state = OTG_STATE_UNDEFINED;

 	return 0;
 }

 static int omap_usb_set_peripheral(struct usb_otg *otg,
 		struct usb_gadget *gadget)
 {
 	struct usb_phy	*phy = otg->phy;

 	otg->gadget = gadget;
 	if (!gadget)
 		phy->state = OTG_STATE_UNDEFINED;

 	return 0;
 }

 static int omap_usb2_suspend(struct usb_phy *x, int suspend)
 {
 	u32 ret;
 	struct omap_usb *phy = phy_to_omapusb(x);

 	if (suspend && !phy->is_suspended) {
 		omap_usb_phy_power(phy, 0);
 		pm_runtime_put_sync(phy->dev);
 		phy->is_suspended = 1;
 	} else if (!suspend && phy->is_suspended) {
 		ret = pm_runtime_get_sync(phy->dev);
 		if (ret < 0) {
 			dev_err(phy->dev, "get_sync failed with err %d\n",
 									ret);
 			return ret;
 		}
 		omap_usb_phy_power(phy, 1);
 		phy->is_suspended = 0;
 	}

 	return 0;
 }

 static int omap_usb2_probe(struct platform_device *pdev)
 {
 	struct omap_usb			*phy;
 	struct usb_otg			*otg;
 	struct resource			*res;

 	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
 	if (!phy) {
 		dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
 		return -ENOMEM;
 	}

 	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 	if (!otg) {
 		dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
 		return -ENOMEM;
 	}

 	phy->dev		= &pdev->dev;

 	phy->phy.dev		= phy->dev;
 	phy->phy.label		= "omap-usb2";
 	phy->phy.set_suspend	= omap_usb2_suspend;
 	phy->phy.otg		= otg;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);

 	phy->control_dev = devm_request_and_ioremap(&pdev->dev, res);
 	if (phy->control_dev == NULL) {
 		dev_err(&pdev->dev, "Failed to obtain io memory\n");
 		return -ENXIO;
 	}

 	phy->is_suspended	= 1;
 	omap_usb_phy_power(phy, 0);

 	otg->set_host		= omap_usb_set_host;
 	otg->set_peripheral	= omap_usb_set_peripheral;
 	otg->set_vbus		= omap_usb_set_vbus;
 	otg->start_srp		= omap_usb_start_srp;
 	otg->phy		= &phy->phy;

 	phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
 	if (IS_ERR(phy->wkupclk)) {
 		dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
 		return PTR_ERR(phy->wkupclk);
 	}
 	clk_prepare(phy->wkupclk);

 	usb_add_phy(&phy->phy, USB_PHY_TYPE_USB2);

 	platform_set_drvdata(pdev, phy);

 	pm_runtime_enable(phy->dev);

 	return 0;
 }

 static int omap_usb2_remove(struct platform_device *pdev)
 {
 	struct omap_usb	*phy = platform_get_drvdata(pdev);

 	clk_unprepare(phy->wkupclk);
 	usb_remove_phy(&phy->phy);

 	return 0;
 }

 #ifdef CONFIG_PM_RUNTIME

 static int omap_usb2_runtime_suspend(struct device *dev)
 {
 	struct platform_device	*pdev = to_platform_device(dev);
 	struct omap_usb	*phy = platform_get_drvdata(pdev);

 	clk_disable(phy->wkupclk);

 	return 0;
 }

 static int omap_usb2_runtime_resume(struct device *dev)
 {
 	u32 ret = 0;
 	struct platform_device	*pdev = to_platform_device(dev);
 	struct omap_usb	*phy = platform_get_drvdata(pdev);

 	ret = clk_enable(phy->wkupclk);
 	if (ret < 0)
 		dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);

 	return ret;
 }

 static const struct dev_pm_ops omap_usb2_pm_ops = {
 	SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
 		NULL)
 };

 #define DEV_PM_OPS     (&omap_usb2_pm_ops)
 #else
 #define DEV_PM_OPS     NULL
 #endif

 #ifdef CONFIG_OF
 static const struct of_device_id omap_usb2_id_table[] = {
 	{ .compatible = "ti,omap-usb2" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
 #endif

 static struct platform_driver omap_usb2_driver = {
 	.probe		= omap_usb2_probe,
 	.remove		= omap_usb2_remove,
 	.driver		= {
 		.name	= "omap-usb2",
 		.owner	= THIS_MODULE,
 		.pm	= DEV_PM_OPS,
 		.of_match_table = of_match_ptr(omap_usb2_id_table),
 	},
 };

 module_platform_driver(omap_usb2_driver);

 MODULE_ALIAS("platform: omap_usb2");
 MODULE_AUTHOR("Texas Instruments Inc.");
 MODULE_DESCRIPTION("OMAP USB2 phy driver");
 MODULE_LICENSE("GPL v2");
	/*
	* omap-usb2.c - USB PHY, talking to musb controller in OMAP.
	*
	* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.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.
	*
	* Author: Kishon Vijay Abraham I <kishon@ti.com>
	*
	* 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/platform_device.h>
	#include <linux/slab.h>
	#include <linux/of.h>
	#include <linux/io.h>
	#include <linux/usb/omap_usb.h>
	#include <linux/usb/phy_companion.h>
	#include <linux/clk.h>
	#include <linux/err.h>
	#include <linux/pm_runtime.h>
	#include <linux/delay.h>

	/**
	* omap_usb2_set_comparator - links the comparator present in the sytem with
	* this phy
	* @comparator - the companion phy(comparator) for this phy
	*
	* The phy companion driver should call this API passing the phy_companion
	* filled with set_vbus and start_srp to be used by usb phy.
	*
	* For use by phy companion driver
	*/
	int omap_usb2_set_comparator(struct phy_companion *comparator)
	{
	struct omap_usb *phy;
	struct usb_phy *x = usb_get_phy(USB_PHY_TYPE_USB2);

	if (IS_ERR(x))
	return -ENODEV;

	phy = phy_to_omapusb(x);
	phy->comparator = comparator;
	return 0;
	}
	EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);

	/**
	* omap_usb_phy_power - power on/off the phy using control module reg
	* @phy: struct omap_usb *
	* @on: 0 or 1, based on powering on or off the PHY
	*
	* XXX: Remove this function once control module driver gets merged
	*/
	static void omap_usb_phy_power(struct omap_usb *phy, int on)
	{
	u32 val;

	if (on) {
	val = readl(phy->control_dev);
	if (val & PHY_PD) {
	writel(~PHY_PD, phy->control_dev);
	/* XXX: add proper documentation for this delay */
	mdelay(200);
	}
	} else {
	writel(PHY_PD, phy->control_dev);
	}
	}

	static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
	{
	struct omap_usb *phy = phy_to_omapusb(otg->phy);

	if (!phy->comparator)
	return -ENODEV;

	return phy->comparator->set_vbus(phy->comparator, enabled);
	}

	static int omap_usb_start_srp(struct usb_otg *otg)
	{
	struct omap_usb *phy = phy_to_omapusb(otg->phy);

	if (!phy->comparator)
	return -ENODEV;

	return phy->comparator->start_srp(phy->comparator);
	}

	static int omap_usb_set_host(struct usb_otg otg, struct usb_bus host)
	{
	struct usb_phy *phy = otg->phy;

	otg->host = host;
	if (!host)
	phy->state = OTG_STATE_UNDEFINED;

	return 0;
	}

	static int omap_usb_set_peripheral(struct usb_otg *otg,
	struct usb_gadget *gadget)
	{
	struct usb_phy *phy = otg->phy;

	otg->gadget = gadget;
	if (!gadget)
	phy->state = OTG_STATE_UNDEFINED;

	return 0;
	}

	static int omap_usb2_suspend(struct usb_phy *x, int suspend)
	{
	u32 ret;
	struct omap_usb *phy = phy_to_omapusb(x);

	if (suspend && !phy->is_suspended) {
	omap_usb_phy_power(phy, 0);
	pm_runtime_put_sync(phy->dev);
	phy->is_suspended = 1;
	} else if (!suspend && phy->is_suspended) {
	ret = pm_runtime_get_sync(phy->dev);
	if (ret < 0) {
	dev_err(phy->dev, "get_sync failed with err %d\n",
	ret);
	return ret;
	}
	omap_usb_phy_power(phy, 1);
	phy->is_suspended = 0;
	}

	return 0;
	}

	static int omap_usb2_probe(struct platform_device *pdev)
	{
	struct omap_usb *phy;
	struct usb_otg *otg;
	struct resource *res;

	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
	if (!phy) {
	dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
	return -ENOMEM;
	}

	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
	if (!otg) {
	dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
	return -ENOMEM;
	}

	phy->dev = &pdev->dev;

	phy->phy.dev = phy->dev;
	phy->phy.label = "omap-usb2";
	phy->phy.set_suspend = omap_usb2_suspend;
	phy->phy.otg = otg;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);

	phy->control_dev = devm_request_and_ioremap(&pdev->dev, res);
	if (phy->control_dev == NULL) {
	dev_err(&pdev->dev, "Failed to obtain io memory\n");
	return -ENXIO;
	}

	phy->is_suspended = 1;
	omap_usb_phy_power(phy, 0);

	otg->set_host = omap_usb_set_host;
	otg->set_peripheral = omap_usb_set_peripheral;
	otg->set_vbus = omap_usb_set_vbus;
	otg->start_srp = omap_usb_start_srp;
	otg->phy = &phy->phy;

	phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
	if (IS_ERR(phy->wkupclk)) {
	dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
	return PTR_ERR(phy->wkupclk);
	}
	clk_prepare(phy->wkupclk);

	usb_add_phy(&phy->phy, USB_PHY_TYPE_USB2);

	platform_set_drvdata(pdev, phy);

	pm_runtime_enable(phy->dev);

	return 0;
	}

	static int omap_usb2_remove(struct platform_device *pdev)
	{
	struct omap_usb *phy = platform_get_drvdata(pdev);

	clk_unprepare(phy->wkupclk);
	usb_remove_phy(&phy->phy);

	return 0;
	}

	#ifdef CONFIG_PM_RUNTIME

	static int omap_usb2_runtime_suspend(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct omap_usb *phy = platform_get_drvdata(pdev);

	clk_disable(phy->wkupclk);

	return 0;
	}

	static int omap_usb2_runtime_resume(struct device *dev)
	{
	u32 ret = 0;
	struct platform_device *pdev = to_platform_device(dev);
	struct omap_usb *phy = platform_get_drvdata(pdev);

	ret = clk_enable(phy->wkupclk);
	if (ret < 0)
	dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);

	return ret;
	}

	static const struct dev_pm_ops omap_usb2_pm_ops = {
	SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
	NULL)
	};

	#define DEV_PM_OPS (&omap_usb2_pm_ops)
	#else
	#define DEV_PM_OPS NULL
	#endif

	#ifdef CONFIG_OF
	static const struct of_device_id omap_usb2_id_table[] = {
	{ .compatible = "ti,omap-usb2" },
	{}
	};
	MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
	#endif

	static struct platform_driver omap_usb2_driver = {
	.probe = omap_usb2_probe,
	.remove = omap_usb2_remove,
	.driver = {
	.name = "omap-usb2",
	.owner = THIS_MODULE,
	.pm = DEV_PM_OPS,
	.of_match_table = of_match_ptr(omap_usb2_id_table),
	},
	};

	module_platform_driver(omap_usb2_driver);

	MODULE_ALIAS("platform: omap_usb2");
	MODULE_AUTHOR("Texas Instruments Inc.");
	MODULE_DESCRIPTION("OMAP USB2 phy driver");
	MODULE_LICENSE("GPL v2");