path: root/drivers/usb/dwc3/core.c

/**
 * core.c - DesignWare USB3 DRD Controller Core file
 *
 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
 *
 * Authors: Felipe Balbi <balbi@ti.com>,
 *	    Sebastian Andrzej Siewior <bigeasy@linutronix.de>
 *
 * 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/version.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/acpi.h>
#include <linux/pinctrl/consumer.h>

#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/of.h>
#include <linux/usb/otg.h>

#include "core.h"
#include "gadget.h"
#include "io.h"

#include "debug.h"

#define DWC3_DEFAULT_AUTOSUSPEND_DELAY	5000 /* ms */

/**
 * dwc3_get_dr_mode - Validates and sets dr_mode
 * @dwc: pointer to our context structure
 */
static int dwc3_get_dr_mode(struct dwc3 *dwc)
{
	enum usb_dr_mode mode;
	struct device *dev = dwc->dev;
	unsigned int hw_mode;

	if (dwc->dr_mode == USB_DR_MODE_UNKNOWN)
		dwc->dr_mode = USB_DR_MODE_OTG;

	mode = dwc->dr_mode;
	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);

	switch (hw_mode) {
	case DWC3_GHWPARAMS0_MODE_GADGET:
		if (IS_ENABLED(CONFIG_USB_DWC3_HOST)) {
			dev_err(dev,
				"Controller does not support host mode.\n");
			return -EINVAL;
		}
		mode = USB_DR_MODE_PERIPHERAL;
		break;
	case DWC3_GHWPARAM