/*
 * FOTG210 UDC Driver supports Bulk transfer so far
 *
 * Copyright (C) 2013 Faraday Technology Corporation
 *
 * Author : Yuan-Hsin Chen <yhchen@faraday-tech.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; version 2 of the License.
 */

#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>

#include "fotg210.h"

#define	DRIVER_DESC	"FOTG210 USB Device Controller Driver"
#define	DRIVER_VERSION	"30-April-2013"

static const char udc_name[] = "fotg210_udc";
static const char * const fotg210_ep_name[] = {
	"ep0", "ep1", "ep2", "ep3", "ep4"};

static void fotg210_disable_fifo_int(struct fotg210_ep *ep)
{
	u32 value = ioread32(ep->fotg210->reg + FOTG210_DMISGR1);

	if (ep->dir_in)
		value |= DMISGR1_MF_IN_INT(ep->epnum - 1);
	else
		value |= DMISGR1_MF_OUTSPK_INT(ep->epnum - 1);
	iowrite32(value, ep->fotg210->reg + FOTG210_DMISGR1);
}

static void fotg210_enable_fifo_int(struct fotg210_ep *ep)
{
	u32 value = ioread32(ep->fotg210->reg + FOTG210_DMISGR1);

	if (ep->dir_in)
		value &= ~DMISGR1_MF_IN_INT(ep->epnum - 1);
	else
		value &= ~DMISGR1_MF_OUTSPK_INT(ep->epnum - 1);
	iowrite32(value, ep->fotg210->reg + FOTG210_DMISGR1);
}

static void fotg210_set_cxdone(struct fotg210_udc *fotg210)
{
	u32 value = ioread32(fotg210->reg + FOTG210_DCFESR);

	value |= DCFESR_CX_DONE;
	iowrite32(value, fotg210->reg + FOTG210_DCFESR);
}

static void fotg210_done(struct fotg210_ep *ep, struct fotg210_request *req,
			int status)
{
	list_del_init(&req->queue);

	/* don't modify queue heads during completion callback */
	if (ep->fotg210->gadget.speed == USB_SPEED_UNKNOWN)
		req->req.status = -ESHUTDOWN;
	else
		req->req.status = status;

	spin_unlock(&ep->fotg210->lock);
	req->req.complete(&ep->ep, &req->req);
	spin_lock(&ep->fotg210->lock);

	if (ep->epnum) {
		if (list_empty(&ep->queue))
			fotg210_disable_fifo_int(ep);
	} else {
		fotg210_set_cxdone(ep->fotg210);
	}
}

static void fotg210_fifo_ep_mapping(struct fotg210_ep *ep, u32 epnum,
				u32 dir_in)
{
	struct fotg210_udc *fotg210 = ep->fotg210;
	u32 val;

	/* Driver should map an ep to a fifo and then map the fifo
	 * to the ep. What a brain-damaged design!
	 */

	/* map a fifo to an ep */
	val = ioread32(fotg210->reg + FOTG210_EPMAP);
	val &= ~EPMAP_FIFONOMSK(epnum,