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/*-
 * Copyright (C) 2012 Intel Corporation
 * All rights reserved.
 *
 * 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.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */

__FBSDID("$FreeBSD$");

#ifndef __IOAT_H__
#define __IOAT_H__

#include <sys/param.h>
#include <machine/bus.h>

/*
 * This file defines the public interface to the IOAT driver.
 */

/*
 * Enables an interrupt for this operation. Typically, you would only enable
 * this on the last operation in a group
 */
#define	DMA_INT_EN	0x1
/*
 * Like M_NOWAIT.  Operations will return NULL if they cannot allocate a
 * descriptor without blocking.
 */
#define	DMA_NO_WAIT	0x2
#define	DMA_ALL_FLAGS	(DMA_INT_EN | DMA_NO_WAIT)

typedef void *bus_dmaengine_t;
struct bus_dmadesc;
typedef void (*bus_dmaengine_callback_t)(void *arg);

/*
 * Called first to acquire a reference to the DMA channel
 */
bus_dmaengine_t ioat_get_dmaengine(uint32_t channel_index);

/* Release the DMA channel */
void ioat_put_dmaengine(bus_dmaengine_t dmaengine);

/*
 * Acquire must be called before issuing an operation to perform. Release is
 * called after. Multiple operations can be issued within the context of one
 * acquire and release
 */
void ioat_acquire(bus_dmaengine_t dmaengine);
void ioat_release(bus_dmaengine_t dmaengine);

/*
 * Issue a blockfill operation.  The 64-bit pattern 'fillpattern' is written to
 * 'len' physically contiguous bytes at 'dst'.
 *
 * Only supported on devices with the BFILL capability.
 */
struct bus_dmadesc *ioat_blockfill(bus_dmaengine_t dmaengine, bus_addr_t dst,
    uint64_t fillpattern, bus_size_t len, bus_dmaengine_callback_t callback_fn,
    void *callback_arg, uint32_t flags);

/* Issues the copy data operation */
struct bus_dmadesc *ioat_copy(bus_dmaengine_t dmaengine, bus_addr_t dst,
    bus_addr_t src, bus_size_t len, bus_dmaengine_callback_t callback_fn,
    void *callback_arg, uint32_t flags);

/*
 * Issues a null operation. This issues the operation to the hardware, but the
 * hardware doesn't do anything with it.
 */
struct bus_dmadesc *ioat_null(bus_dmaengine_t dmaengine,
    bus_dmaengine_callback_t callback_fn, void *callback_arg, uint32_t flags);


#endif /* __IOAT_H__ */