/*
 * Copyright © 2004 Eric Anholt
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Eric Anholt not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Eric Anholt makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * ERIC ANHOLT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL ERIC ANHOLT BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */
/* $Header$ */

#ifndef _ATI_DMA_H_
#define _ATI_DMA_H_

#define DMA_PACKET0(reg, count)						\
	(ATI_CCE_PACKET0 | (((count) - 1) << 16) | ((reg) >> 2))
#define DMA_PACKET1(reg1, reg2)						\
	(ATI_CCE_PACKET1 |						\
	(((reg2) >> 2) << ATI_CCE_PACKET1_REG_2_SHIFT) |  ((reg1) >> 2))
#define DMA_PACKET3(type, count)					\
	((type) | (((count) - 1) << 16))

#if 0	/* CCE non-debug */

#define RING_LOCALS	CARD32 *__head; int __count
#define BEGIN_DMA(n)							\
do {									\
	if ((atis->indirectBuffer->used + 4*(n)) >			\
	    atis->indirectBuffer->size) {				\
		ATIFlushIndirect(atis, 1);				\
	}								\
	__head = (CARD32 *)((char *)atis->indirectBuffer->address +	\
	    atis->indirectBuffer->used);				\
	__count = 0;							\
} while (0)
#define END_DMA() do {							\
	atis->indirectBuffer->used += __count * 4;			\
} while (0)

#else

#define RING_LOCALS	CARD32 *__head; int __count; int __total
#define BEGIN_DMA(n)							\
do {									\
	if ((atis->indirectBuffer->used + 4*(n)) >			\
	    atis->indirectBuffer->size) {				\
		ATIFlushIndirect(atis, 1);				\
	}								\
	__head = (CARD32 *)((char *)atis->indirectBuffer->address +	\
	    atis->indirectBuffer->used);				\
	__count = 0;							\
	__total = n;							\
} while (0)
#define END_DMA() do {							\
	if (__count != __total)						\
		ErrorF("count != total (%d vs %d) at %s:%d\n", __count, \
		    __total, __FILE__, __LINE__);			\
	atis->indirectBuffer->used += __count * 4;			\
} while (0)

#endif

#define OUT_RING(x) do {						\
	__head[__count++] = (x);					\
} while (0)

#define OUT_REG(reg, val)						\
do {									\
	OUT_RING(DMA_PACKET0(reg, 1));					\
	OUT_RING(val);							\
} while (0)

dmaBuf *
ATIGetDMABuffer(ATIScreenInfo *atis);

void
ATIFlushIndirect(ATIScreenInfo *atis, Bool discard);

void
ATIDMASetup(ScreenPtr pScreen);

void
ATIDMATeardown(ScreenPtr pScreen);

#endif /* _ATI_DMA_H_ */