drivers/mfd/omap-usb-tll.c - linux - Git at Google

 /**
  * omap-usb-tll.c - The USB TLL driver for OMAP EHCI & OHCI
  *
  * Copyright (C) 2012-2013 Texas Instruments Incorporated - http://www.ti.com
  * Author: Keshava Munegowda <keshava_mgowda@ti.com>
  * Author: Roger Quadros <rogerq@ti.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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/err.h>
 #include <linux/pm_runtime.h>
 #include <linux/platform_data/usb-omap.h>
 #include <linux/of.h>

 #include "omap-usb.h"

 #define USBTLL_DRIVER_NAME	"usbhs_tll"

 /* TLL Register Set */
 #define	OMAP_USBTLL_REVISION				(0x00)
 #define	OMAP_USBTLL_SYSCONFIG				(0x10)
 #define	OMAP_USBTLL_SYSCONFIG_CACTIVITY			(1 << 8)
 #define	OMAP_USBTLL_SYSCONFIG_SIDLEMODE			(1 << 3)
 #define	OMAP_USBTLL_SYSCONFIG_ENAWAKEUP			(1 << 2)
 #define	OMAP_USBTLL_SYSCONFIG_SOFTRESET			(1 << 1)
 #define	OMAP_USBTLL_SYSCONFIG_AUTOIDLE			(1 << 0)

 #define	OMAP_USBTLL_SYSSTATUS				(0x14)
 #define	OMAP_USBTLL_SYSSTATUS_RESETDONE			(1 << 0)

 #define	OMAP_USBTLL_IRQSTATUS				(0x18)
 #define	OMAP_USBTLL_IRQENABLE				(0x1C)

 #define	OMAP_TLL_SHARED_CONF				(0x30)
 #define	OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN		(1 << 6)
 #define	OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN		(1 << 5)
 #define	OMAP_TLL_SHARED_CONF_USB_DIVRATION		(1 << 2)
 #define	OMAP_TLL_SHARED_CONF_FCLK_REQ			(1 << 1)
 #define	OMAP_TLL_SHARED_CONF_FCLK_IS_ON			(1 << 0)

 #define	OMAP_TLL_CHANNEL_CONF(num)			(0x040 + 0x004 * num)
 #define OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT		24
 #define OMAP_TLL_CHANNEL_CONF_DRVVBUS			(1 << 16)
 #define OMAP_TLL_CHANNEL_CONF_CHRGVBUS			(1 << 15)
 #define	OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF		(1 << 11)
 #define	OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE		(1 << 10)
 #define	OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE		(1 << 9)
 #define	OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE		(1 << 8)
 #define OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI	(2 << 1)
 #define OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS		(1 << 1)
 #define	OMAP_TLL_CHANNEL_CONF_CHANEN			(1 << 0)

 #define OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0		0x0
 #define OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM		0x1
 #define OMAP_TLL_FSLSMODE_3PIN_PHY			0x2
 #define OMAP_TLL_FSLSMODE_4PIN_PHY			0x3
 #define OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0		0x4
 #define OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM		0x5
 #define OMAP_TLL_FSLSMODE_3PIN_TLL			0x6
 #define OMAP_TLL_FSLSMODE_4PIN_TLL			0x7
 #define OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0		0xA
 #define OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM		0xB

 #define	OMAP_TLL_ULPI_FUNCTION_CTRL(num)		(0x804 + 0x100 * num)
 #define	OMAP_TLL_ULPI_INTERFACE_CTRL(num)		(0x807 + 0x100 * num)
 #define	OMAP_TLL_ULPI_OTG_CTRL(num)			(0x80A + 0x100 * num)
 #define	OMAP_TLL_ULPI_INT_EN_RISE(num)			(0x80D + 0x100 * num)
 #define	OMAP_TLL_ULPI_INT_EN_FALL(num)			(0x810 + 0x100 * num)
 #define	OMAP_TLL_ULPI_INT_STATUS(num)			(0x813 + 0x100 * num)
 #define	OMAP_TLL_ULPI_INT_LATCH(num)			(0x814 + 0x100 * num)
 #define	OMAP_TLL_ULPI_DEBUG(num)			(0x815 + 0x100 * num)
 #define	OMAP_TLL_ULPI_SCRATCH_REGISTER(num)		(0x816 + 0x100 * num)

 #define OMAP_REV2_TLL_CHANNEL_COUNT			2
 #define OMAP_TLL_CHANNEL_COUNT				3
 #define OMAP_TLL_CHANNEL_1_EN_MASK			(1 << 0)
 #define OMAP_TLL_CHANNEL_2_EN_MASK			(1 << 1)
 #define OMAP_TLL_CHANNEL_3_EN_MASK			(1 << 2)

 /* Values of USBTLL_REVISION - Note: these are not given in the TRM */
 #define OMAP_USBTLL_REV1		0x00000015	/* OMAP3 */
 #define OMAP_USBTLL_REV2		0x00000018	/* OMAP 3630 */
 #define OMAP_USBTLL_REV3		0x00000004	/* OMAP4 */
 #define OMAP_USBTLL_REV4		0x00000006	/* OMAP5 */

 #define is_ehci_tll_mode(x)	(x == OMAP_EHCI_PORT_MODE_TLL)

 /* only PHY and UNUSED modes don't need TLL */
 #define omap_usb_mode_needs_tll(x)	((x) != OMAP_USBHS_PORT_MODE_UNUSED &&\
 					 (x) != OMAP_EHCI_PORT_MODE_PHY)

 struct usbtll_omap {
 	void __iomem	*base;
 	int		nch;		/* num. of channels */
 	struct clk	*ch_clk[0];	/* must be the last member */
 };

 /*-------------------------------------------------------------------------*/

 static const char usbtll_driver_name[] = USBTLL_DRIVER_NAME;
 static struct device	*tll_dev;
 static DEFINE_SPINLOCK(tll_lock);	/* serialize access to tll_dev */

 /*-------------------------------------------------------------------------*/

 static inline void usbtll_write(void __iomem *base, u32 reg, u32 val)
 {
 	writel_relaxed(val, base + reg);
 }

 static inline u32 usbtll_read(void __iomem *base, u32 reg)
 {
 	return readl_relaxed(base + reg);
 }

 static inline void usbtll_writeb(void __iomem *base, u32 reg, u8 val)
 {
 	writeb_relaxed(val, base + reg);
 }

 static inline u8 usbtll_readb(void __iomem *base, u32 reg)
 {
 	return readb_relaxed(base + reg);
 }

 /*-------------------------------------------------------------------------*/

 static bool is_ohci_port(enum usbhs_omap_port_mode pmode)
 {
 	switch (pmode) {
 	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
 	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
 	case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
 	case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
 	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
 	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
 	case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
 	case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
 	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
 	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
 		return true;

 	default:
 		return false;
 	}
 }

 /*
  * convert the port-mode enum to a value we can use in the FSLSMODE
  * field of USBTLL_CHANNEL_CONF
  */
 static unsigned ohci_omap3_fslsmode(enum usbhs_omap_port_mode mode)
 {
 	switch (mode) {
 	case OMAP_USBHS_PORT_MODE_UNUSED:
 	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
 		return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;

 	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
 		return OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM;

 	case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
 		return OMAP_TLL_FSLSMODE_3PIN_PHY;

 	case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
 		return OMAP_TLL_FSLSMODE_4PIN_PHY;

 	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
 		return OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0;

 	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
 		return OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM;

 	case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
 		return OMAP_TLL_FSLSMODE_3PIN_TLL;

 	case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
 		return OMAP_TLL_FSLSMODE_4PIN_TLL;

 	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
 		return OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0;

 	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
 		return OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM;
 	default:
 		pr_warn("Invalid port mode, using default\n");
 		return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
 	}
 }

 /**
  * usbtll_omap_probe - initialize TI-based HCDs
  *
  * Allocates basic resources for this USB host controller.
  */
 static int usbtll_omap_probe(struct platform_device *pdev)
 {
 	struct device				*dev =  &pdev->dev;
 	struct resource				*res;
 	struct usbtll_omap			*tll;
 	void __iomem				*base;
 	int					i, nch, ver;

 	dev_dbg(dev, "starting TI HSUSB TLL Controller\n");

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(base))
 		return PTR_ERR(base);

 	pm_runtime_enable(dev);
 	pm_runtime_get_sync(dev);

 	ver = usbtll_read(base, OMAP_USBTLL_REVISION);
 	switch (ver) {
 	case OMAP_USBTLL_REV1:
 	case OMAP_USBTLL_REV4:
 		nch = OMAP_TLL_CHANNEL_COUNT;
 		break;
 	case OMAP_USBTLL_REV2:
 	case OMAP_USBTLL_REV3:
 		nch = OMAP_REV2_TLL_CHANNEL_COUNT;
 		break;
 	default:
 		nch = OMAP_TLL_CHANNEL_COUNT;
 		dev_dbg(dev, "rev 0x%x not recognized, assuming %d channels\n",
 			ver, nch);
 		break;
 	}

 	tll = devm_kzalloc(dev, sizeof(*tll) + sizeof(tll->ch_clk[nch]),
 			   GFP_KERNEL);
 	if (!tll) {
 		pm_runtime_put_sync(dev);
 		pm_runtime_disable(dev);
 		return -ENOMEM;
 	}

 	tll->base = base;
 	tll->nch = nch;
 	platform_set_drvdata(pdev, tll);

 	for (i = 0; i < nch; i++) {
 		char clkname[] = "usb_tll_hs_usb_chx_clk";

 		snprintf(clkname, sizeof(clkname),
 					"usb_tll_hs_usb_ch%d_clk", i);
 		tll->ch_clk[i] = clk_get(dev, clkname);

 		if (IS_ERR(tll->ch_clk[i]))
 			dev_dbg(dev, "can't get clock : %s\n", clkname);
 		else
 			clk_prepare(tll->ch_clk[i]);
 	}

 	pm_runtime_put_sync(dev);
 	/* only after this can omap_tll_enable/disable work */
 	spin_lock(&tll_lock);
 	tll_dev = dev;
 	spin_unlock(&tll_lock);

 	return 0;
 }

 /**
  * usbtll_omap_remove - shutdown processing for UHH & TLL HCDs
  * @pdev: USB Host Controller being removed
  *
  * Reverses the effect of usbtll_omap_probe().
  */
 static int usbtll_omap_remove(struct platform_device *pdev)
 {
 	struct usbtll_omap *tll = platform_get_drvdata(pdev);
 	int i;

 	spin_lock(&tll_lock);
 	tll_dev = NULL;
 	spin_unlock(&tll_lock);

 	for (i = 0; i < tll->nch; i++) {
 		if (!IS_ERR(tll->ch_clk[i])) {
 			clk_unprepare(tll->ch_clk[i]);
 			clk_put(tll->ch_clk[i]);
 		}
 	}

 	pm_runtime_disable(&pdev->dev);
 	return 0;
 }

 static const struct of_device_id usbtll_omap_dt_ids[] = {
 	{ .compatible = "ti,usbhs-tll" },
 	{ }
 };

 MODULE_DEVICE_TABLE(of, usbtll_omap_dt_ids);

 static struct platform_driver usbtll_omap_driver = {
 	.driver = {
 		.name		= (char *)usbtll_driver_name,
 		.of_match_table = usbtll_omap_dt_ids,
 	},
 	.probe		= usbtll_omap_probe,
 	.remove		= usbtll_omap_remove,
 };

 int omap_tll_init(struct usbhs_omap_platform_data *pdata)
 {
 	int i;
 	bool needs_tll;
 	unsigned reg;
 	struct usbtll_omap *tll;

 	if (!tll_dev)
 		return -ENODEV;

 	pm_runtime_get_sync(tll_dev);

 	spin_lock(&tll_lock);
 	tll = dev_get_drvdata(tll_dev);
 	needs_tll = false;
 	for (i = 0; i < tll->nch; i++)
 		needs_tll |= omap_usb_mode_needs_tll(pdata->port_mode[i]);

 	if (needs_tll) {
 		void __iomem *base = tll->base;

 		/* Program Common TLL register */
 		reg = usbtll_read(base, OMAP_TLL_SHARED_CONF);
 		reg |= (OMAP_TLL_SHARED_CONF_FCLK_IS_ON
 			| OMAP_TLL_SHARED_CONF_USB_DIVRATION);
 		reg &= ~OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN;
 		reg &= ~OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN;

 		usbtll_write(base, OMAP_TLL_SHARED_CONF, reg);

 		/* Enable channels now */
 		for (i = 0; i < tll->nch; i++) {
 			reg = usbtll_read(base,	OMAP_TLL_CHANNEL_CONF(i));

 			if (is_ohci_port(pdata->port_mode[i])) {
 				reg |= ohci_omap3_fslsmode(pdata->port_mode[i])
 				<< OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT;
 				reg |= OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS;
 			} else if (pdata->port_mode[i] ==
 					OMAP_EHCI_PORT_MODE_TLL) {
 				/*
 				 * Disable UTMI AutoIdle, BitStuffing
 				 * and use SDR Mode. Enable ULPI AutoIdle.
 				 */
 				reg &= ~(OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE
 					| OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE);
 				reg |= OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
 				reg |= OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE;
 			} else if (pdata->port_mode[i] ==
 					OMAP_EHCI_PORT_MODE_HSIC) {
 				/*
 				 * HSIC Mode requires UTMI port configurations
 				 */
 				reg |= OMAP_TLL_CHANNEL_CONF_DRVVBUS
 				 | OMAP_TLL_CHANNEL_CONF_CHRGVBUS
 				 | OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI
 				 | OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
 			} else {
 				continue;
 			}
 			reg |= OMAP_TLL_CHANNEL_CONF_CHANEN;
 			usbtll_write(base, OMAP_TLL_CHANNEL_CONF(i), reg);

 			usbtll_writeb(base,
 				      OMAP_TLL_ULPI_SCRATCH_REGISTER(i),
 				      0xbe);
 		}
 	}

 	spin_unlock(&tll_lock);
 	pm_runtime_put_sync(tll_dev);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(omap_tll_init);

 int omap_tll_enable(struct usbhs_omap_platform_data *pdata)
 {
 	int i;
 	struct usbtll_omap *tll;

 	if (!tll_dev)
 		return -ENODEV;

 	pm_runtime_get_sync(tll_dev);

 	spin_lock(&tll_lock);
 	tll = dev_get_drvdata(tll_dev);

 	for (i = 0; i < tll->nch; i++) {
 		if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
 			int r;

 			if (IS_ERR(tll->ch_clk[i]))
 				continue;

 			r = clk_enable(tll->ch_clk[i]);
 			if (r) {
 				dev_err(tll_dev,
 				 "Error enabling ch %d clock: %d\n", i, r);
 			}
 		}
 	}

 	spin_unlock(&tll_lock);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(omap_tll_enable);

 int omap_tll_disable(struct usbhs_omap_platform_data *pdata)
 {
 	int i;
 	struct usbtll_omap *tll;

 	if (!tll_dev)
 		return -ENODEV;

 	spin_lock(&tll_lock);
 	tll = dev_get_drvdata(tll_dev);

 	for (i = 0; i < tll->nch; i++) {
 		if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
 			if (!IS_ERR(tll->ch_clk[i]))
 				clk_disable(tll->ch_clk[i]);
 		}
 	}

 	spin_unlock(&tll_lock);
 	pm_runtime_put_sync(tll_dev);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(omap_tll_disable);

 MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>");
 MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("usb tll driver for TI OMAP EHCI and OHCI controllers");

 static int __init omap_usbtll_drvinit(void)
 {
 	return platform_driver_register(&usbtll_omap_driver);
 }

 /*
  * init before usbhs core driver;
  * The usbtll driver should be initialized before
  * the usbhs core driver probe function is called.
  */
 fs_initcall(omap_usbtll_drvinit);

 static void __exit omap_usbtll_drvexit(void)
 {
 	platform_driver_unregister(&usbtll_omap_driver);
 }
 module_exit(omap_usbtll_drvexit);
	/**
	* omap-usb-tll.c - The USB TLL driver for OMAP EHCI & OHCI
	*
	* Copyright (C) 2012-2013 Texas Instruments Incorporated - http://www.ti.com
	* Author: Keshava Munegowda <keshava_mgowda@ti.com>
	* Author: Roger Quadros <rogerq@ti.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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/slab.h>
	#include <linux/spinlock.h>
	#include <linux/platform_device.h>
	#include <linux/clk.h>
	#include <linux/io.h>
	#include <linux/err.h>
	#include <linux/pm_runtime.h>
	#include <linux/platform_data/usb-omap.h>
	#include <linux/of.h>

	#include "omap-usb.h"

	#define USBTLL_DRIVER_NAME "usbhs_tll"

	/* TLL Register Set */
	#define OMAP_USBTLL_REVISION (0x00)
	#define OMAP_USBTLL_SYSCONFIG (0x10)
	#define OMAP_USBTLL_SYSCONFIG_CACTIVITY (1 << 8)
	#define OMAP_USBTLL_SYSCONFIG_SIDLEMODE (1 << 3)
	#define OMAP_USBTLL_SYSCONFIG_ENAWAKEUP (1 << 2)
	#define OMAP_USBTLL_SYSCONFIG_SOFTRESET (1 << 1)
	#define OMAP_USBTLL_SYSCONFIG_AUTOIDLE (1 << 0)

	#define OMAP_USBTLL_SYSSTATUS (0x14)
	#define OMAP_USBTLL_SYSSTATUS_RESETDONE (1 << 0)

	#define OMAP_USBTLL_IRQSTATUS (0x18)
	#define OMAP_USBTLL_IRQENABLE (0x1C)

	#define OMAP_TLL_SHARED_CONF (0x30)
	#define OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN (1 << 6)
	#define OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN (1 << 5)
	#define OMAP_TLL_SHARED_CONF_USB_DIVRATION (1 << 2)
	#define OMAP_TLL_SHARED_CONF_FCLK_REQ (1 << 1)
	#define OMAP_TLL_SHARED_CONF_FCLK_IS_ON (1 << 0)

	#define OMAP_TLL_CHANNEL_CONF(num) (0x040 + 0x004 * num)
	#define OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT 24
	#define OMAP_TLL_CHANNEL_CONF_DRVVBUS (1 << 16)
	#define OMAP_TLL_CHANNEL_CONF_CHRGVBUS (1 << 15)
	#define OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF (1 << 11)
	#define OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE (1 << 10)
	#define OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE (1 << 9)
	#define OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE (1 << 8)
	#define OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI (2 << 1)
	#define OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS (1 << 1)
	#define OMAP_TLL_CHANNEL_CONF_CHANEN (1 << 0)

	#define OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0 0x0
	#define OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM 0x1
	#define OMAP_TLL_FSLSMODE_3PIN_PHY 0x2
	#define OMAP_TLL_FSLSMODE_4PIN_PHY 0x3
	#define OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0 0x4
	#define OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM 0x5
	#define OMAP_TLL_FSLSMODE_3PIN_TLL 0x6
	#define OMAP_TLL_FSLSMODE_4PIN_TLL 0x7
	#define OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0 0xA
	#define OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM 0xB

	#define OMAP_TLL_ULPI_FUNCTION_CTRL(num) (0x804 + 0x100 * num)
	#define OMAP_TLL_ULPI_INTERFACE_CTRL(num) (0x807 + 0x100 * num)
	#define OMAP_TLL_ULPI_OTG_CTRL(num) (0x80A + 0x100 * num)
	#define OMAP_TLL_ULPI_INT_EN_RISE(num) (0x80D + 0x100 * num)
	#define OMAP_TLL_ULPI_INT_EN_FALL(num) (0x810 + 0x100 * num)
	#define OMAP_TLL_ULPI_INT_STATUS(num) (0x813 + 0x100 * num)
	#define OMAP_TLL_ULPI_INT_LATCH(num) (0x814 + 0x100 * num)
	#define OMAP_TLL_ULPI_DEBUG(num) (0x815 + 0x100 * num)
	#define OMAP_TLL_ULPI_SCRATCH_REGISTER(num) (0x816 + 0x100 * num)

	#define OMAP_REV2_TLL_CHANNEL_COUNT 2
	#define OMAP_TLL_CHANNEL_COUNT 3
	#define OMAP_TLL_CHANNEL_1_EN_MASK (1 << 0)
	#define OMAP_TLL_CHANNEL_2_EN_MASK (1 << 1)
	#define OMAP_TLL_CHANNEL_3_EN_MASK (1 << 2)

	/* Values of USBTLL_REVISION - Note: these are not given in the TRM */
	#define OMAP_USBTLL_REV1 0x00000015 /* OMAP3 */
	#define OMAP_USBTLL_REV2 0x00000018 /* OMAP 3630 */
	#define OMAP_USBTLL_REV3 0x00000004 /* OMAP4 */
	#define OMAP_USBTLL_REV4 0x00000006 /* OMAP5 */

	#define is_ehci_tll_mode(x) (x == OMAP_EHCI_PORT_MODE_TLL)

	/* only PHY and UNUSED modes don't need TLL */
	#define omap_usb_mode_needs_tll(x) ((x) != OMAP_USBHS_PORT_MODE_UNUSED &&\
	(x) != OMAP_EHCI_PORT_MODE_PHY)

	struct usbtll_omap {
	void __iomem *base;
	int nch; /* num. of channels */
	struct clk ch_clk[0]; / must be the last member */
	};

	/-------------------------------------------------------------------------/

	static const char usbtll_driver_name[] = USBTLL_DRIVER_NAME;
	static struct device *tll_dev;
	static DEFINE_SPINLOCK(tll_lock); /* serialize access to tll_dev */

	/-------------------------------------------------------------------------/

	static inline void usbtll_write(void __iomem *base, u32 reg, u32 val)
	{
	writel_relaxed(val, base + reg);
	}

	static inline u32 usbtll_read(void __iomem *base, u32 reg)
	{
	return readl_relaxed(base + reg);
	}

	static inline void usbtll_writeb(void __iomem *base, u32 reg, u8 val)
	{
	writeb_relaxed(val, base + reg);
	}

	static inline u8 usbtll_readb(void __iomem *base, u32 reg)
	{
	return readb_relaxed(base + reg);
	}

	/-------------------------------------------------------------------------/

	static bool is_ohci_port(enum usbhs_omap_port_mode pmode)
	{
	switch (pmode) {
	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
	case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
	case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
	case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
	case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
	return true;

	default:
	return false;
	}
	}

	/*
	* convert the port-mode enum to a value we can use in the FSLSMODE
	* field of USBTLL_CHANNEL_CONF
	*/
	static unsigned ohci_omap3_fslsmode(enum usbhs_omap_port_mode mode)
	{
	switch (mode) {
	case OMAP_USBHS_PORT_MODE_UNUSED:
	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
	return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;

	case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
	return OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM;

	case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
	return OMAP_TLL_FSLSMODE_3PIN_PHY;

	case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
	return OMAP_TLL_FSLSMODE_4PIN_PHY;

	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
	return OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0;

	case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
	return OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM;

	case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
	return OMAP_TLL_FSLSMODE_3PIN_TLL;

	case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
	return OMAP_TLL_FSLSMODE_4PIN_TLL;

	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
	return OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0;

	case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
	return OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM;
	default:
	pr_warn("Invalid port mode, using default\n");
	return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
	}
	}

	/**
	* usbtll_omap_probe - initialize TI-based HCDs
	*
	* Allocates basic resources for this USB host controller.
	*/
	static int usbtll_omap_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct resource *res;
	struct usbtll_omap *tll;
	void __iomem *base;
	int i, nch, ver;

	dev_dbg(dev, "starting TI HSUSB TLL Controller\n");

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base))
	return PTR_ERR(base);

	pm_runtime_enable(dev);
	pm_runtime_get_sync(dev);

	ver = usbtll_read(base, OMAP_USBTLL_REVISION);
	switch (ver) {
	case OMAP_USBTLL_REV1:
	case OMAP_USBTLL_REV4:
	nch = OMAP_TLL_CHANNEL_COUNT;
	break;
	case OMAP_USBTLL_REV2:
	case OMAP_USBTLL_REV3:
	nch = OMAP_REV2_TLL_CHANNEL_COUNT;
	break;
	default:
	nch = OMAP_TLL_CHANNEL_COUNT;
	dev_dbg(dev, "rev 0x%x not recognized, assuming %d channels\n",
	ver, nch);
	break;
	}

	tll = devm_kzalloc(dev, sizeof(*tll) + sizeof(tll->ch_clk[nch]),
	GFP_KERNEL);
	if (!tll) {
	pm_runtime_put_sync(dev);
	pm_runtime_disable(dev);
	return -ENOMEM;
	}

	tll->base = base;
	tll->nch = nch;
	platform_set_drvdata(pdev, tll);

	for (i = 0; i < nch; i++) {
	char clkname[] = "usb_tll_hs_usb_chx_clk";

	snprintf(clkname, sizeof(clkname),
	"usb_tll_hs_usb_ch%d_clk", i);
	tll->ch_clk[i] = clk_get(dev, clkname);

	if (IS_ERR(tll->ch_clk[i]))
	dev_dbg(dev, "can't get clock : %s\n", clkname);
	else
	clk_prepare(tll->ch_clk[i]);
	}

	pm_runtime_put_sync(dev);
	/* only after this can omap_tll_enable/disable work */
	spin_lock(&tll_lock);
	tll_dev = dev;
	spin_unlock(&tll_lock);

	return 0;
	}

	/**
	* usbtll_omap_remove - shutdown processing for UHH & TLL HCDs
	* @pdev: USB Host Controller being removed
	*
	* Reverses the effect of usbtll_omap_probe().
	*/
	static int usbtll_omap_remove(struct platform_device *pdev)
	{
	struct usbtll_omap *tll = platform_get_drvdata(pdev);
	int i;

	spin_lock(&tll_lock);
	tll_dev = NULL;
	spin_unlock(&tll_lock);

	for (i = 0; i < tll->nch; i++) {
	if (!IS_ERR(tll->ch_clk[i])) {
	clk_unprepare(tll->ch_clk[i]);
	clk_put(tll->ch_clk[i]);
	}
	}

	pm_runtime_disable(&pdev->dev);
	return 0;
	}

	static const struct of_device_id usbtll_omap_dt_ids[] = {
	{ .compatible = "ti,usbhs-tll" },
	{ }
	};

	MODULE_DEVICE_TABLE(of, usbtll_omap_dt_ids);

	static struct platform_driver usbtll_omap_driver = {
	.driver = {
	.name = (char *)usbtll_driver_name,
	.of_match_table = usbtll_omap_dt_ids,
	},
	.probe = usbtll_omap_probe,
	.remove = usbtll_omap_remove,
	};

	int omap_tll_init(struct usbhs_omap_platform_data *pdata)
	{
	int i;
	bool needs_tll;
	unsigned reg;
	struct usbtll_omap *tll;

	if (!tll_dev)
	return -ENODEV;

	pm_runtime_get_sync(tll_dev);

	spin_lock(&tll_lock);
	tll = dev_get_drvdata(tll_dev);
	needs_tll = false;
	for (i = 0; i < tll->nch; i++)
	needs_tll \|= omap_usb_mode_needs_tll(pdata->port_mode[i]);

	if (needs_tll) {
	void __iomem *base = tll->base;

	/* Program Common TLL register */
	reg = usbtll_read(base, OMAP_TLL_SHARED_CONF);
	reg \|= (OMAP_TLL_SHARED_CONF_FCLK_IS_ON
	\| OMAP_TLL_SHARED_CONF_USB_DIVRATION);
	reg &= ~OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN;
	reg &= ~OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN;

	usbtll_write(base, OMAP_TLL_SHARED_CONF, reg);

	/* Enable channels now */
	for (i = 0; i < tll->nch; i++) {
	reg = usbtll_read(base, OMAP_TLL_CHANNEL_CONF(i));

	if (is_ohci_port(pdata->port_mode[i])) {
	reg \|= ohci_omap3_fslsmode(pdata->port_mode[i])
	<< OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT;
	reg \|= OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS;
	} else if (pdata->port_mode[i] ==
	OMAP_EHCI_PORT_MODE_TLL) {
	/*
	* Disable UTMI AutoIdle, BitStuffing
	* and use SDR Mode. Enable ULPI AutoIdle.
	*/
	reg &= ~(OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE
	\| OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE);
	reg \|= OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
	reg \|= OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE;
	} else if (pdata->port_mode[i] ==
	OMAP_EHCI_PORT_MODE_HSIC) {
	/*
	* HSIC Mode requires UTMI port configurations
	*/
	reg \|= OMAP_TLL_CHANNEL_CONF_DRVVBUS
	\| OMAP_TLL_CHANNEL_CONF_CHRGVBUS
	\| OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI
	\| OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
	} else {
	continue;
	}
	reg \|= OMAP_TLL_CHANNEL_CONF_CHANEN;
	usbtll_write(base, OMAP_TLL_CHANNEL_CONF(i), reg);

	usbtll_writeb(base,
	OMAP_TLL_ULPI_SCRATCH_REGISTER(i),
	0xbe);
	}
	}

	spin_unlock(&tll_lock);
	pm_runtime_put_sync(tll_dev);

	return 0;
	}
	EXPORT_SYMBOL_GPL(omap_tll_init);

	int omap_tll_enable(struct usbhs_omap_platform_data *pdata)
	{
	int i;
	struct usbtll_omap *tll;

	if (!tll_dev)
	return -ENODEV;

	pm_runtime_get_sync(tll_dev);

	spin_lock(&tll_lock);
	tll = dev_get_drvdata(tll_dev);

	for (i = 0; i < tll->nch; i++) {
	if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
	int r;

	if (IS_ERR(tll->ch_clk[i]))
	continue;

	r = clk_enable(tll->ch_clk[i]);
	if (r) {
	dev_err(tll_dev,
	"Error enabling ch %d clock: %d\n", i, r);
	}
	}
	}

	spin_unlock(&tll_lock);

	return 0;
	}
	EXPORT_SYMBOL_GPL(omap_tll_enable);

	int omap_tll_disable(struct usbhs_omap_platform_data *pdata)
	{
	int i;
	struct usbtll_omap *tll;

	if (!tll_dev)
	return -ENODEV;

	spin_lock(&tll_lock);
	tll = dev_get_drvdata(tll_dev);

	for (i = 0; i < tll->nch; i++) {
	if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
	if (!IS_ERR(tll->ch_clk[i]))
	clk_disable(tll->ch_clk[i]);
	}
	}

	spin_unlock(&tll_lock);
	pm_runtime_put_sync(tll_dev);

	return 0;
	}
	EXPORT_SYMBOL_GPL(omap_tll_disable);

	MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>");
	MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("usb tll driver for TI OMAP EHCI and OHCI controllers");

	static int __init omap_usbtll_drvinit(void)
	{
	return platform_driver_register(&usbtll_omap_driver);
	}

	/*
	* init before usbhs core driver;
	* The usbtll driver should be initialized before
	* the usbhs core driver probe function is called.
	*/
	fs_initcall(omap_usbtll_drvinit);

	static void __exit omap_usbtll_drvexit(void)
	{
	platform_driver_unregister(&usbtll_omap_driver);
	}
	module_exit(omap_usbtll_drvexit);