/**
 * gadget.h - DesignWare USB3 DRD Gadget Header
 *
 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
 *
 * Authors: Felipe Balbi <balbi@ti.com>,
 *	    Sebastian Andrzej Siewior <bigeasy@linutronix.de>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The names of the above-listed copyright holders may not be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2, as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __DRIVERS_USB_DWC3_GADGET_H
#define __DRIVERS_USB_DWC3_GADGET_H

#include <linux/list.h>
#include <linux/usb/gadget.h>
#include "io.h"

struct dwc3;
#define to_dwc3_ep(ep)		(container_of(ep, struct dwc3_ep, endpoint))
#define gadget_to_dwc(g)	(container_of(g, struct dwc3, gadget))

/* DEPCFG parameter 1 */
#define DWC3_DEPCFG_INT_NUM(n)		(((n) & 0x1f) << 0)
#define DWC3_DEPCFG_XFER_COMPLETE_EN	(1 << 8)
#define DWC3_DEPCFG_XFER_IN_PROGRESS_EN	(1 << 9)
#define DWC3_DEPCFG_XFER_NOT_READY_EN	(1 << 10)
#define DWC3_DEPCFG_FIFO_ERROR_EN	(1 << 11)
#define DWC3_DEPCFG_STREAM_EVENT_EN	(1 << 13)
#define DWC3_DEPCFG_BINTERVAL_M1(n)	(((n) & 0xff) << 16)
#define DWC3_DEPCFG_STREAM_CAPABLE	(1 << 24)
#define DWC3_DEPCFG_EP_NUMBER(n)	(((n) & 0x1f) << 25)
#define DWC3_DEPCFG_BULK_BASED		(1 << 30)
#define DWC3_DEPCFG_FIFO_BASED		(1 << 31)

/* DEPCFG parameter 0 */
#define DWC3_DEPCFG_EP_TYPE(n)		(((n) & 0x3) << 1)
#define DWC3_DEPCFG_MAX_PACKET_SIZE(n)	(((n) & 0x7ff) << 3)
#define DWC3_DEPCFG_FIFO_NUMBER(n)	(((n) & 0x1f) << 17)
#define DWC3_DEPCFG_BURST_SIZE(n)	(((n) & 0xf) << 22)
#define DWC3_DEPCFG_DATA_SEQ_NUM(n)	((n) << 26)
#define DWC3_DEPCFG_IGN_SEQ_NUM		(1 << 31)

/* DEPXFERCFG parameter 0 */
#define DWC3_DEPXFERCFG_NUM_XFER_RES(n)	((n) & 0xffff)

struct dwc3_gadget_ep_cmd_params {
	u32	param2;
	u32	param1;
	u32	param0;
};

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

struct dwc3_request {
	struct usb_request	request;
	struct list_head	list;
	struct dwc3_ep		*dep;

	u8			epnum;
	struct dwc3_trb_hw	*trb;
	dma_addr_t		trb_dma;

	unsigned		direction:1;
	unsigned		mapped:1;
	unsigned		queued:1;
};
#define to_dwc3_request(r)	(container_of(r, struct dwc3_request, request))

static inline struct dwc3_request *next_request(struct list_head *list)
{
	if (list_empty(list))
		return NULL;

	return list_first_entry(list, struct dwc3_request, list);
}

static inline void dwc3_gadget_move_request_queued(struct dwc3_request *req)
{
	struct dwc3_ep		*dep = req->dep;

	req->queued = true;
	list_move_tail(&req->list, &dep->req_queued);
}

#if defined(CONFIG_USB_GADGET_DWC3) || defined(CONFIG_USB_GADGET_DWC3_MODULE)
int dwc3_gadget_init(struct dwc3 *dwc);
void dwc3_gadget_exit(struct dwc3 *dwc);
#else
static inline int dwc3_gadget_init(struct dwc3 *dwc) { return 0; }
static inline void dwc3_gadget_exit(struct dwc3 *dwc) { }
static inline int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
		unsigned cmd, struct dwc3_gadget_ep_cmd_params *params)
{
	return 0;
}
#endif

void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
		int status);

void dwc3_ep0_interrupt(struct dwc3 *dwc, const struct dwc3_event_depevt *event);
void dwc3_ep0_out_start(struct dwc3 *dwc);
int dwc3_gadget_ep0_queue(struct usb_ep *ep, struct usb_request *request,
		gfp_t gfp_flags);
int __dwc3_gadget_ep_set_halt(struct dwc3_ep *dep, int value);
int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
		unsigned cmd, struct dwc3_gadget_ep_cmd_params *params);
void dwc3_map_buffer_to_dma(struct dwc3_request *req);
void dwc3_unmap_buffer_from_dma(struct dwc3_request *req);

/**
 * dwc3_gadget_ep_get_transfer_index - Gets transfer index from HW
 * @dwc: DesignWare USB3 Pointer
 * @number: DWC endpoint number
 *
 * Caller should take care of locking
 */
static inline u32 dwc3_gadget_ep_get_transfer_index(struct dwc3 *dwc, u8 number)
{
	u32			res_id;

	res_id = dwc3_readl(dwc->regs, DWC3_DEPCMD(number));

	return DWC3_DEPCMD_GET_RSC_IDX(res_id);
}

/**
 * dwc3_gadget_event_string - returns event name
 * @event: the event code
 */
static inline const char *dwc3_gadget_event_string(u8 event)
{
	switch (event) {
	case DWC3_DEVICE_EVENT_DISCONNECT:
		return "Disconnect";
	case DWC3_DEVICE_EVENT_RESET:
		return "Reset";
	case DWC3_DEVICE_EVENT_CONNECT_DONE:
		return "Connection Done";
	case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
		return "Link Status Change";
	case DWC3_DEVICE_EVENT_WAKEUP:
		return "WakeUp";
	case DWC3_DEVICE_EVENT_EOPF:
		return "End-Of-Frame";
	case DWC3_DEVICE_EVENT_SOF:
		return "Start-Of-Frame";
	case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
		return "Erratic Error";
	case DWC3_DEVICE_EVENT_CMD_CMPL:
		return "Command Complete";
	case DWC3_DEVICE_EVENT_OVERFLOW:
		return "Overflow";
	}

	return "UNKNOWN";
}

/**
 * dwc3_ep_event_string - returns event name
 * @event: then event code
 */
static inline const char *dwc3_ep_event_string(u8 event)
{
	switch (event) {
	case DWC3_DEPEVT_XFERCOMPLETE:
		return "Transfer Complete";
	case DWC3_DEPEVT_XFERINPROGRESS:
		return "Transfer In-Progress";
	case DWC3_DEPEVT_XFERNOTREADY:
		return "Transfer Not Ready";
	case DWC3_DEPEVT_RXTXFIFOEVT:
		return "FIFO";
	case DWC3_DEPEVT_STREAMEVT:
		return "Stream";
	case DWC3_DEPEVT_EPCMDCMPLT:
		return "Endpoint Command Complete";
	}

	return "UNKNOWN";
}

#endif /* __DRIVERS_USB_DWC3_GADGET_H */
