drivers/phy/phy-omap-control.c - kernel/common - Git at Google

 /*
  * omap-control-phy.c - The PHY part of control module.
  *
  * Copyright (C) 2013 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 <[email protected]>
  *
  * 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/of_device.h>
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/clk.h>
 #include <linux/phy/omap_control_phy.h>

 /**
  * omap_control_phy_power - power on/off the phy using control module reg
  * @dev: the control module device
  * @on: 0 or 1, based on powering on or off the PHY
  */
 void omap_control_phy_power(struct device *dev, int on)
 {
 	u32 val;
 	unsigned long rate;
 	struct omap_control_phy	*control_phy;

 	if (IS_ERR(dev) || !dev) {
 		pr_err("%s: invalid device\n", __func__);
 		return;
 	}

 	control_phy = dev_get_drvdata(dev);
 	if (!control_phy) {
 		dev_err(dev, "%s: invalid control phy device\n", __func__);
 		return;
 	}

 	if (control_phy->type == OMAP_CTRL_TYPE_OTGHS)
 		return;

 	val = readl(control_phy->power);

 	switch (control_phy->type) {
 	case OMAP_CTRL_TYPE_USB2:
 		if (on)
 			val &= ~OMAP_CTRL_DEV_PHY_PD;
 		else
 			val |= OMAP_CTRL_DEV_PHY_PD;
 		break;

 	case OMAP_CTRL_TYPE_PIPE3:
 		rate = clk_get_rate(control_phy->sys_clk);
 		rate = rate/1000000;

 		if (on) {
 			val &= ~(OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK |
 				OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK);
 			val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON <<
 				OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
 			val |= rate <<
 				OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT;
 		} else {
 			val &= ~OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK;
 			val |= OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF <<
 				OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
 		}
 		break;

 	case OMAP_CTRL_TYPE_DRA7USB2:
 		if (on)
 			val &= ~OMAP_CTRL_USB2_PHY_PD;
 		else
 			val |= OMAP_CTRL_USB2_PHY_PD;
 		break;

 	case OMAP_CTRL_TYPE_AM437USB2:
 		if (on) {
 			val &= ~(AM437X_CTRL_USB2_PHY_PD |
 					AM437X_CTRL_USB2_OTG_PD);
 			val |= (AM437X_CTRL_USB2_OTGVDET_EN |
 					AM437X_CTRL_USB2_OTGSESSEND_EN);
 		} else {
 			val &= ~(AM437X_CTRL_USB2_OTGVDET_EN |
 					AM437X_CTRL_USB2_OTGSESSEND_EN);
 			val |= (AM437X_CTRL_USB2_PHY_PD |
 					 AM437X_CTRL_USB2_OTG_PD);
 		}
 		break;
 	default:
 		dev_err(dev, "%s: type %d not recognized\n",
 			__func__, control_phy->type);
 		break;
 	}

 	writel(val, control_phy->power);
 }
 EXPORT_SYMBOL_GPL(omap_control_phy_power);

 /**
  * omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded
  * @ctrl_phy: struct omap_control_phy *
  *
  * Writes to the mailbox register to notify the usb core that a usb
  * device has been connected.
  */
 static void omap_control_usb_host_mode(struct omap_control_phy *ctrl_phy)
 {
 	u32 val;

 	val = readl(ctrl_phy->otghs_control);
 	val &= ~(OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND);
 	val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID;
 	writel(val, ctrl_phy->otghs_control);
 }

 /**
  * omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
  * impedance
  * @ctrl_phy: struct omap_control_phy *
  *
  * Writes to the mailbox register to notify the usb core that it has been
  * connected to a usb host.
  */
 static void omap_control_usb_device_mode(struct omap_control_phy *ctrl_phy)
 {
 	u32 val;

 	val = readl(ctrl_phy->otghs_control);
 	val &= ~OMAP_CTRL_DEV_SESSEND;
 	val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_AVALID |
 		OMAP_CTRL_DEV_VBUSVALID;
 	writel(val, ctrl_phy->otghs_control);
 }

 /**
  * omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
  * impedance
  * @ctrl_phy: struct omap_control_phy *
  *
  * Writes to the mailbox register to notify the usb core it's now in
  * disconnected state.
  */
 static void omap_control_usb_set_sessionend(struct omap_control_phy *ctrl_phy)
 {
 	u32 val;

 	val = readl(ctrl_phy->otghs_control);
 	val &= ~(OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID);
 	val |= OMAP_CTRL_DEV_IDDIG | OMAP_CTRL_DEV_SESSEND;
 	writel(val, ctrl_phy->otghs_control);
 }

 /**
  * omap_control_usb_set_mode - Calls to functions to set USB in one of host mode
  * or device mode or to denote disconnected state
  * @dev: the control module device
  * @mode: The mode to which usb should be configured
  *
  * This is an API to write to the mailbox register to notify the usb core that
  * a usb device has been connected.
  */
 void omap_control_usb_set_mode(struct device *dev,
 	enum omap_control_usb_mode mode)
 {
 	struct omap_control_phy	*ctrl_phy;

 	if (IS_ERR(dev) || !dev)
 		return;

 	ctrl_phy = dev_get_drvdata(dev);

 	if (!ctrl_phy) {
 		dev_err(dev, "Invalid control phy device\n");
 		return;
 	}

 	if (ctrl_phy->type != OMAP_CTRL_TYPE_OTGHS)
 		return;

 	switch (mode) {
 	case USB_MODE_HOST:
 		omap_control_usb_host_mode(ctrl_phy);
 		break;
 	case USB_MODE_DEVICE:
 		omap_control_usb_device_mode(ctrl_phy);
 		break;
 	case USB_MODE_DISCONNECT:
 		omap_control_usb_set_sessionend(ctrl_phy);
 		break;
 	default:
 		dev_vdbg(dev, "invalid omap control usb mode\n");
 	}
 }
 EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);

 #ifdef CONFIG_OF

 static const enum omap_control_phy_type otghs_data = OMAP_CTRL_TYPE_OTGHS;
 static const enum omap_control_phy_type usb2_data = OMAP_CTRL_TYPE_USB2;
 static const enum omap_control_phy_type pipe3_data = OMAP_CTRL_TYPE_PIPE3;
 static const enum omap_control_phy_type dra7usb2_data = OMAP_CTRL_TYPE_DRA7USB2;
 static const enum omap_control_phy_type am437usb2_data = OMAP_CTRL_TYPE_AM437USB2;

 static const struct of_device_id omap_control_phy_id_table[] = {
 	{
 		.compatible = "ti,control-phy-otghs",
 		.data = &otghs_data,
 	},
 	{
 		.compatible = "ti,control-phy-usb2",
 		.data = &usb2_data,
 	},
 	{
 		.compatible = "ti,control-phy-pipe3",
 		.data = &pipe3_data,
 	},
 	{
 		.compatible = "ti,control-phy-usb2-dra7",
 		.data = &dra7usb2_data,
 	},
 	{
 		.compatible = "ti,control-phy-usb2-am437",
 		.data = &am437usb2_data,
 	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, omap_control_phy_id_table);
 #endif


 static int omap_control_phy_probe(struct platform_device *pdev)
 {
 	struct resource	*res;
 	const struct of_device_id *of_id;
 	struct omap_control_phy *control_phy;

 	of_id = of_match_device(of_match_ptr(omap_control_phy_id_table),
 				&pdev->dev);
 	if (!of_id)
 		return -EINVAL;

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

 	control_phy->dev = &pdev->dev;
 	control_phy->type = *(enum omap_control_phy_type *)of_id->data;

 	if (control_phy->type == OMAP_CTRL_TYPE_OTGHS) {
 		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 			"otghs_control");
 		control_phy->otghs_control = devm_ioremap_resource(
 			&pdev->dev, res);
 		if (IS_ERR(control_phy->otghs_control))
 			return PTR_ERR(control_phy->otghs_control);
 	} else {
 		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
 				"power");
 		control_phy->power = devm_ioremap_resource(&pdev->dev, res);
 		if (IS_ERR(control_phy->power)) {
 			dev_err(&pdev->dev, "Couldn't get power register\n");
 			return PTR_ERR(control_phy->power);
 		}
 	}

 	if (control_phy->type == OMAP_CTRL_TYPE_PIPE3) {
 		control_phy->sys_clk = devm_clk_get(control_phy->dev,
 			"sys_clkin");
 		if (IS_ERR(control_phy->sys_clk)) {
 			pr_err("%s: unable to get sys_clkin\n", __func__);
 			return -EINVAL;
 		}
 	}

 	dev_set_drvdata(control_phy->dev, control_phy);

 	return 0;
 }

 static struct platform_driver omap_control_phy_driver = {
 	.probe		= omap_control_phy_probe,
 	.driver		= {
 		.name	= "omap-control-phy",
 		.owner	= THIS_MODULE,
 		.of_match_table = of_match_ptr(omap_control_phy_id_table),
 	},
 };

 static int __init omap_control_phy_init(void)
 {
 	return platform_driver_register(&omap_control_phy_driver);
 }
 subsys_initcall(omap_control_phy_init);

 static void __exit omap_control_phy_exit(void)
 {
 	platform_driver_unregister(&omap_control_phy_driver);
 }
 module_exit(omap_control_phy_exit);

 MODULE_ALIAS("platform: omap_control_phy");
 MODULE_AUTHOR("Texas Instruments Inc.");
 MODULE_DESCRIPTION("OMAP Control Module PHY Driver");
 MODULE_LICENSE("GPL v2");
	/*
	* omap-control-phy.c - The PHY part of control module.
	*
	* Copyright (C) 2013 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 <[email protected]>
	*
	* 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/of_device.h>
	#include <linux/err.h>
	#include <linux/io.h>
	#include <linux/clk.h>
	#include <linux/phy/omap_control_phy.h>

	/**
	* omap_control_phy_power - power on/off the phy using control module reg
	* @dev: the control module device
	* @on: 0 or 1, based on powering on or off the PHY
	*/
	void omap_control_phy_power(struct device *dev, int on)
	{
	u32 val;
	unsigned long rate;
	struct omap_control_phy *control_phy;

	if (IS_ERR(dev) \|\| !dev) {
	pr_err("%s: invalid device\n", __func__);
	return;
	}

	control_phy = dev_get_drvdata(dev);
	if (!control_phy) {
	dev_err(dev, "%s: invalid control phy device\n", __func__);
	return;
	}

	if (control_phy->type == OMAP_CTRL_TYPE_OTGHS)
	return;

	val = readl(control_phy->power);

	switch (control_phy->type) {
	case OMAP_CTRL_TYPE_USB2:
	if (on)
	val &= ~OMAP_CTRL_DEV_PHY_PD;
	else
	val \|= OMAP_CTRL_DEV_PHY_PD;
	break;

	case OMAP_CTRL_TYPE_PIPE3:
	rate = clk_get_rate(control_phy->sys_clk);
	rate = rate/1000000;

	if (on) {
	val &= ~(OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK \|
	OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK);
	val \|= OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON <<
	OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
	val \|= rate <<
	OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT;
	} else {
	val &= ~OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK;
	val \|= OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF <<
	OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
	}
	break;

	case OMAP_CTRL_TYPE_DRA7USB2:
	if (on)
	val &= ~OMAP_CTRL_USB2_PHY_PD;
	else
	val \|= OMAP_CTRL_USB2_PHY_PD;
	break;

	case OMAP_CTRL_TYPE_AM437USB2:
	if (on) {
	val &= ~(AM437X_CTRL_USB2_PHY_PD \|
	AM437X_CTRL_USB2_OTG_PD);
	val \|= (AM437X_CTRL_USB2_OTGVDET_EN \|
	AM437X_CTRL_USB2_OTGSESSEND_EN);
	} else {
	val &= ~(AM437X_CTRL_USB2_OTGVDET_EN \|
	AM437X_CTRL_USB2_OTGSESSEND_EN);
	val \|= (AM437X_CTRL_USB2_PHY_PD \|
	AM437X_CTRL_USB2_OTG_PD);
	}
	break;
	default:
	dev_err(dev, "%s: type %d not recognized\n",
	__func__, control_phy->type);
	break;
	}

	writel(val, control_phy->power);
	}
	EXPORT_SYMBOL_GPL(omap_control_phy_power);

	/**
	* omap_control_usb_host_mode - set AVALID, VBUSVALID and ID pin in grounded
	* @ctrl_phy: struct omap_control_phy *
	*
	* Writes to the mailbox register to notify the usb core that a usb
	* device has been connected.
	*/
	static void omap_control_usb_host_mode(struct omap_control_phy *ctrl_phy)
	{
	u32 val;

	val = readl(ctrl_phy->otghs_control);
	val &= ~(OMAP_CTRL_DEV_IDDIG \| OMAP_CTRL_DEV_SESSEND);
	val \|= OMAP_CTRL_DEV_AVALID \| OMAP_CTRL_DEV_VBUSVALID;
	writel(val, ctrl_phy->otghs_control);
	}

	/**
	* omap_control_usb_device_mode - set AVALID, VBUSVALID and ID pin in high
	* impedance
	* @ctrl_phy: struct omap_control_phy *
	*
	* Writes to the mailbox register to notify the usb core that it has been
	* connected to a usb host.
	*/
	static void omap_control_usb_device_mode(struct omap_control_phy *ctrl_phy)
	{
	u32 val;

	val = readl(ctrl_phy->otghs_control);
	val &= ~OMAP_CTRL_DEV_SESSEND;
	val \|= OMAP_CTRL_DEV_IDDIG \| OMAP_CTRL_DEV_AVALID \|
	OMAP_CTRL_DEV_VBUSVALID;
	writel(val, ctrl_phy->otghs_control);
	}

	/**
	* omap_control_usb_set_sessionend - Enable SESSIONEND and IDIG to high
	* impedance
	* @ctrl_phy: struct omap_control_phy *
	*
	* Writes to the mailbox register to notify the usb core it's now in
	* disconnected state.
	*/
	static void omap_control_usb_set_sessionend(struct omap_control_phy *ctrl_phy)
	{
	u32 val;

	val = readl(ctrl_phy->otghs_control);
	val &= ~(OMAP_CTRL_DEV_AVALID \| OMAP_CTRL_DEV_VBUSVALID);
	val \|= OMAP_CTRL_DEV_IDDIG \| OMAP_CTRL_DEV_SESSEND;
	writel(val, ctrl_phy->otghs_control);
	}

	/**
	* omap_control_usb_set_mode - Calls to functions to set USB in one of host mode
	* or device mode or to denote disconnected state
	* @dev: the control module device
	* @mode: The mode to which usb should be configured
	*
	* This is an API to write to the mailbox register to notify the usb core that
	* a usb device has been connected.
	*/
	void omap_control_usb_set_mode(struct device *dev,
	enum omap_control_usb_mode mode)
	{
	struct omap_control_phy *ctrl_phy;

	if (IS_ERR(dev) \|\| !dev)
	return;

	ctrl_phy = dev_get_drvdata(dev);

	if (!ctrl_phy) {
	dev_err(dev, "Invalid control phy device\n");
	return;
	}

	if (ctrl_phy->type != OMAP_CTRL_TYPE_OTGHS)
	return;

	switch (mode) {
	case USB_MODE_HOST:
	omap_control_usb_host_mode(ctrl_phy);
	break;
	case USB_MODE_DEVICE:
	omap_control_usb_device_mode(ctrl_phy);
	break;
	case USB_MODE_DISCONNECT:
	omap_control_usb_set_sessionend(ctrl_phy);
	break;
	default:
	dev_vdbg(dev, "invalid omap control usb mode\n");
	}
	}
	EXPORT_SYMBOL_GPL(omap_control_usb_set_mode);

	#ifdef CONFIG_OF

	static const enum omap_control_phy_type otghs_data = OMAP_CTRL_TYPE_OTGHS;
	static const enum omap_control_phy_type usb2_data = OMAP_CTRL_TYPE_USB2;
	static const enum omap_control_phy_type pipe3_data = OMAP_CTRL_TYPE_PIPE3;
	static const enum omap_control_phy_type dra7usb2_data = OMAP_CTRL_TYPE_DRA7USB2;
	static const enum omap_control_phy_type am437usb2_data = OMAP_CTRL_TYPE_AM437USB2;

	static const struct of_device_id omap_control_phy_id_table[] = {
	{
	.compatible = "ti,control-phy-otghs",
	.data = &otghs_data,
	},
	{
	.compatible = "ti,control-phy-usb2",
	.data = &usb2_data,
	},
	{
	.compatible = "ti,control-phy-pipe3",
	.data = &pipe3_data,
	},
	{
	.compatible = "ti,control-phy-usb2-dra7",
	.data = &dra7usb2_data,
	},
	{
	.compatible = "ti,control-phy-usb2-am437",
	.data = &am437usb2_data,
	},
	{},
	};
	MODULE_DEVICE_TABLE(of, omap_control_phy_id_table);
	#endif


	static int omap_control_phy_probe(struct platform_device *pdev)
	{
	struct resource *res;
	const struct of_device_id *of_id;
	struct omap_control_phy *control_phy;

	of_id = of_match_device(of_match_ptr(omap_control_phy_id_table),
	&pdev->dev);
	if (!of_id)
	return -EINVAL;

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

	control_phy->dev = &pdev->dev;
	control_phy->type = (enum omap_control_phy_type )of_id->data;

	if (control_phy->type == OMAP_CTRL_TYPE_OTGHS) {
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	"otghs_control");
	control_phy->otghs_control = devm_ioremap_resource(
	&pdev->dev, res);
	if (IS_ERR(control_phy->otghs_control))
	return PTR_ERR(control_phy->otghs_control);
	} else {
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
	"power");
	control_phy->power = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(control_phy->power)) {
	dev_err(&pdev->dev, "Couldn't get power register\n");
	return PTR_ERR(control_phy->power);
	}
	}

	if (control_phy->type == OMAP_CTRL_TYPE_PIPE3) {
	control_phy->sys_clk = devm_clk_get(control_phy->dev,
	"sys_clkin");
	if (IS_ERR(control_phy->sys_clk)) {
	pr_err("%s: unable to get sys_clkin\n", __func__);
	return -EINVAL;
	}
	}

	dev_set_drvdata(control_phy->dev, control_phy);

	return 0;
	}

	static struct platform_driver omap_control_phy_driver = {
	.probe = omap_control_phy_probe,
	.driver = {
	.name = "omap-control-phy",
	.owner = THIS_MODULE,
	.of_match_table = of_match_ptr(omap_control_phy_id_table),
	},
	};

	static int __init omap_control_phy_init(void)
	{
	return platform_driver_register(&omap_control_phy_driver);
	}
	subsys_initcall(omap_control_phy_init);

	static void __exit omap_control_phy_exit(void)
	{
	platform_driver_unregister(&omap_control_phy_driver);
	}
	module_exit(omap_control_phy_exit);

	MODULE_ALIAS("platform: omap_control_phy");
	MODULE_AUTHOR("Texas Instruments Inc.");
	MODULE_DESCRIPTION("OMAP Control Module PHY Driver");
	MODULE_LICENSE("GPL v2");