drivers/video/nvidia/nv_accel.c - pub/scm/linux/kernel/git/iwlwifi/iwlwifi-next - Git at Google

  /***************************************************************************\
 |*                                                                           *|
 |*       Copyright 1993-2003 NVIDIA, Corporation.  All rights reserved.      *|
 |*                                                                           *|
 |*     NOTICE TO USER:   The source code  is copyrighted under  U.S. and     *|
 |*     international laws.  Users and possessors of this source code are     *|
 |*     hereby granted a nonexclusive,  royalty-free copyright license to     *|
 |*     use this code in individual and commercial software.                  *|
 |*                                                                           *|
 |*     Any use of this source code must include,  in the user documenta-     *|
 |*     tion and  internal comments to the code,  notices to the end user     *|
 |*     as follows:                                                           *|
 |*                                                                           *|
 |*       Copyright 1993-2003 NVIDIA, Corporation.  All rights reserved.      *|
 |*                                                                           *|
 |*     NVIDIA, CORPORATION MAKES NO REPRESENTATION ABOUT THE SUITABILITY     *|
 |*     OF  THIS SOURCE  CODE  FOR ANY PURPOSE.  IT IS  PROVIDED  "AS IS"     *|
 |*     WITHOUT EXPRESS OR IMPLIED WARRANTY OF ANY KIND.  NVIDIA, CORPOR-     *|
 |*     ATION DISCLAIMS ALL WARRANTIES  WITH REGARD  TO THIS SOURCE CODE,     *|
 |*     INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGE-     *|
 |*     MENT,  AND FITNESS  FOR A PARTICULAR PURPOSE.   IN NO EVENT SHALL     *|
 |*     NVIDIA, CORPORATION  BE LIABLE FOR ANY SPECIAL,  INDIRECT,  INCI-     *|
 |*     DENTAL, OR CONSEQUENTIAL DAMAGES,  OR ANY DAMAGES  WHATSOEVER RE-     *|
 |*     SULTING 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 SOURCE CODE.     *|
 |*                                                                           *|
 |*     U.S. Government  End  Users.   This source code  is a "commercial     *|
 |*     item,"  as that  term is  defined at  48 C.F.R. 2.101 (OCT 1995),     *|
 |*     consisting  of "commercial  computer  software"  and  "commercial     *|
 |*     computer  software  documentation,"  as such  terms  are  used in     *|
 |*     48 C.F.R. 12.212 (SEPT 1995)  and is provided to the U.S. Govern-     *|
 |*     ment only as  a commercial end item.   Consistent with  48 C.F.R.     *|
 |*     12.212 and  48 C.F.R. 227.7202-1 through  227.7202-4 (JUNE 1995),     *|
 |*     all U.S. Government End Users  acquire the source code  with only     *|
 |*     those rights set forth herein.                                        *|
 |*                                                                           *|
  \***************************************************************************/

 /*
  * GPL Licensing Note - According to Mark Vojkovich, author of the Xorg/
  * XFree86 'nv' driver, this source code is provided under MIT-style licensing
  * where the source code is provided "as is" without warranty of any kind.
  * The only usage restriction is for the copyright notices to be retained
  * whenever code is used.
  *
  * Antonino Daplas <adaplas@pol.net> 2005-03-11
  */

 #include <linux/fb.h>
 #include "nv_type.h"
 #include "nv_proto.h"
 #include "nv_dma.h"
 #include "nv_local.h"

 /* There is a HW race condition with videoram command buffers.
    You can't jump to the location of your put offset.  We write put
    at the jump offset + SKIPS dwords with noop padding in between
    to solve this problem */
 #define SKIPS  8

 static const int NVCopyROP[16] = {
 	0xCC,			/* copy   */
 	0x55			/* invert */
 };

 static const int NVCopyROP_PM[16] = {
 	0xCA,			/* copy  */
 	0x5A,			/* invert */
 };

 static inline void NVFlush(struct nvidia_par *par)
 {
 	int count = 1000000000;

 	while (--count && READ_GET(par) != par->dmaPut) ;

 	if (!count) {
 		printk("nvidiafb: DMA Flush lockup\n");
 		par->lockup = 1;
 	}
 }

 static inline void NVSync(struct nvidia_par *par)
 {
 	int count = 1000000000;

 	while (--count && NV_RD32(par->PGRAPH, 0x0700)) ;

 	if (!count) {
 		printk("nvidiafb: DMA Sync lockup\n");
 		par->lockup = 1;
 	}
 }

 static void NVDmaKickoff(struct nvidia_par *par)
 {
 	if (par->dmaCurrent != par->dmaPut) {
 		par->dmaPut = par->dmaCurrent;
 		WRITE_PUT(par, par->dmaPut);
 	}
 }

 static void NVDmaWait(struct nvidia_par *par, int size)
 {
 	int dmaGet;
 	int count = 1000000000, cnt;
 	size++;

 	while (par->dmaFree < size && --count && !par->lockup) {
 		dmaGet = READ_GET(par);

 		if (par->dmaPut >= dmaGet) {
 			par->dmaFree = par->dmaMax - par->dmaCurrent;
 			if (par->dmaFree < size) {
 				NVDmaNext(par, 0x20000000);
 				if (dmaGet <= SKIPS) {
 					if (par->dmaPut <= SKIPS)
 						WRITE_PUT(par, SKIPS + 1);
 					cnt = 1000000000;
 					do {
 						dmaGet = READ_GET(par);
 					} while (--cnt && dmaGet <= SKIPS);
 					if (!cnt) {
 						printk("DMA Get lockup\n");
 						par->lockup = 1;
 					}
 				}
 				WRITE_PUT(par, SKIPS);
 				par->dmaCurrent = par->dmaPut = SKIPS;
 				par->dmaFree = dmaGet - (SKIPS + 1);
 			}
 		} else
 			par->dmaFree = dmaGet - par->dmaCurrent - 1;
 	}

 	if (!count) {
 		printk("DMA Wait Lockup\n");
 		par->lockup = 1;
 	}
 }

 static void NVSetPattern(struct nvidia_par *par, u32 clr0, u32 clr1,
 			 u32 pat0, u32 pat1)
 {
 	NVDmaStart(par, PATTERN_COLOR_0, 4);
 	NVDmaNext(par, clr0);
 	NVDmaNext(par, clr1);
 	NVDmaNext(par, pat0);
 	NVDmaNext(par, pat1);
 }

 static void NVSetRopSolid(struct nvidia_par *par, u32 rop, u32 planemask)
 {
 	if (planemask != ~0) {
 		NVSetPattern(par, 0, planemask, ~0, ~0);
 		if (par->currentRop != (rop + 32)) {
 			NVDmaStart(par, ROP_SET, 1);
 			NVDmaNext(par, NVCopyROP_PM[rop]);
 			par->currentRop = rop + 32;
 		}
 	} else if (par->currentRop != rop) {
 		if (par->currentRop >= 16)
 			NVSetPattern(par, ~0, ~0, ~0, ~0);
 		NVDmaStart(par, ROP_SET, 1);
 		NVDmaNext(par, NVCopyROP[rop]);
 		par->currentRop = rop;
 	}
 }

 static void NVSetClippingRectangle(struct fb_info *info, int x1, int y1,
 				   int x2, int y2)
 {
 	struct nvidia_par *par = info->par;
 	int h = y2 - y1 + 1;
 	int w = x2 - x1 + 1;

 	NVDmaStart(par, CLIP_POINT, 2);
 	NVDmaNext(par, (y1 << 16) | x1);
 	NVDmaNext(par, (h << 16) | w);
 }

 void NVResetGraphics(struct fb_info *info)
 {
 	struct nvidia_par *par = info->par;
 	u32 surfaceFormat, patternFormat, rectFormat, lineFormat;
 	int pitch, i;

 	pitch = info->fix.line_length;

 	par->dmaBase = (u32 __iomem *) (&par->FbStart[par->FbUsableSize]);

 	for (i = 0; i < SKIPS; i++)
 		NV_WR32(&par->dmaBase[i], 0, 0x00000000);

 	NV_WR32(&par->dmaBase[0x0 + SKIPS], 0, 0x00040000);
 	NV_WR32(&par->dmaBase[0x1 + SKIPS], 0, 0x80000010);
 	NV_WR32(&par->dmaBase[0x2 + SKIPS], 0, 0x00042000);
 	NV_WR32(&par->dmaBase[0x3 + SKIPS], 0, 0x80000011);
 	NV_WR32(&par->dmaBase[0x4 + SKIPS], 0, 0x00044000);
 	NV_WR32(&par->dmaBase[0x5 + SKIPS], 0, 0x80000012);
 	NV_WR32(&par->dmaBase[0x6 + SKIPS], 0, 0x00046000);
 	NV_WR32(&par->dmaBase[0x7 + SKIPS], 0, 0x80000013);
 	NV_WR32(&par->dmaBase[0x8 + SKIPS], 0, 0x00048000);
 	NV_WR32(&par->dmaBase[0x9 + SKIPS], 0, 0x80000014);
 	NV_WR32(&par->dmaBase[0xA + SKIPS], 0, 0x0004A000);
 	NV_WR32(&par->dmaBase[0xB + SKIPS], 0, 0x80000015);
 	NV_WR32(&par->dmaBase[0xC + SKIPS], 0, 0x0004C000);
 	NV_WR32(&par->dmaBase[0xD + SKIPS], 0, 0x80000016);
 	NV_WR32(&par->dmaBase[0xE + SKIPS], 0, 0x0004E000);
 	NV_WR32(&par->dmaBase[0xF + SKIPS], 0, 0x80000017);

 	par->dmaPut = 0;
 	par->dmaCurrent = 16 + SKIPS;
 	par->dmaMax = 8191;
 	par->dmaFree = par->dmaMax - par->dmaCurrent;

 	switch (info->var.bits_per_pixel) {
 	case 32:
 	case 24:
 		surfaceFormat = SURFACE_FORMAT_DEPTH24;
 		patternFormat = PATTERN_FORMAT_DEPTH24;
 		rectFormat = RECT_FORMAT_DEPTH24;
 		lineFormat = LINE_FORMAT_DEPTH24;
 		break;
 	case 16:
 		surfaceFormat = SURFACE_FORMAT_DEPTH16;
 		patternFormat = PATTERN_FORMAT_DEPTH16;
 		rectFormat = RECT_FORMAT_DEPTH16;
 		lineFormat = LINE_FORMAT_DEPTH16;
 		break;
 	default:
 		surfaceFormat = SURFACE_FORMAT_DEPTH8;
 		patternFormat = PATTERN_FORMAT_DEPTH8;
 		rectFormat = RECT_FORMAT_DEPTH8;
 		lineFormat = LINE_FORMAT_DEPTH8;
 		break;
 	}

 	NVDmaStart(par, SURFACE_FORMAT, 4);
 	NVDmaNext(par, surfaceFormat);
 	NVDmaNext(par, pitch | (pitch << 16));
 	NVDmaNext(par, 0);
 	NVDmaNext(par, 0);

 	NVDmaStart(par, PATTERN_FORMAT, 1);
 	NVDmaNext(par, patternFormat);

 	NVDmaStart(par, RECT_FORMAT, 1);
 	NVDmaNext(par, rectFormat);

 	NVDmaStart(par, LINE_FORMAT, 1);
 	NVDmaNext(par, lineFormat);

 	par->currentRop = ~0;	/* set to something invalid */
 	NVSetRopSolid(par, ROP_COPY, ~0);

 	NVSetClippingRectangle(info, 0, 0, info->var.xres_virtual,
 			       info->var.yres_virtual);

 	NVDmaKickoff(par);
 }

 u8 byte_rev[256] = {
 	0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
 	0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
 	0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
 	0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
 	0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
 	0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
 	0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
 	0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
 	0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
 	0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
 	0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
 	0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
 	0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
 	0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
 	0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
 	0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
 	0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
 	0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
 	0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
 	0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
 	0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
 	0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
 	0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
 	0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
 	0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
 	0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
 	0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
 	0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
 	0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
 	0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
 	0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
 	0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
 };

 int nvidiafb_sync(struct fb_info *info)
 {
 	struct nvidia_par *par = info->par;

 	if (!par->lockup)
 		NVFlush(par);

 	if (!par->lockup)
 		NVSync(par);

 	return 0;
 }

 void nvidiafb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
 {
 	struct nvidia_par *par = info->par;

 	if (par->lockup)
 		return cfb_copyarea(info, region);

 	NVDmaStart(par, BLIT_POINT_SRC, 3);
 	NVDmaNext(par, (region->sy << 16) | region->sx);
 	NVDmaNext(par, (region->dy << 16) | region->dx);
 	NVDmaNext(par, (region->height << 16) | region->width);

 	NVDmaKickoff(par);
 }

 void nvidiafb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
 {
 	struct nvidia_par *par = info->par;
 	u32 color;

 	if (par->lockup)
 		return cfb_fillrect(info, rect);

 	if (info->var.bits_per_pixel == 8)
 		color = rect->color;
 	else
 		color = ((u32 *) info->pseudo_palette)[rect->color];

 	if (rect->rop != ROP_COPY)
 		NVSetRopSolid(par, rect->rop, ~0);

 	NVDmaStart(par, RECT_SOLID_COLOR, 1);
 	NVDmaNext(par, color);

 	NVDmaStart(par, RECT_SOLID_RECTS(0), 2);
 	NVDmaNext(par, (rect->dx << 16) | rect->dy);
 	NVDmaNext(par, (rect->width << 16) | rect->height);

 	NVDmaKickoff(par);

 	if (rect->rop != ROP_COPY)
 		NVSetRopSolid(par, ROP_COPY, ~0);
 }

 static void nvidiafb_mono_color_expand(struct fb_info *info,
 				       const struct fb_image *image)
 {
 	struct nvidia_par *par = info->par;
 	u32 fg, bg, mask = ~(~0 >> (32 - info->var.bits_per_pixel));
 	u32 dsize, width, *data = (u32 *) image->data, tmp;
 	int j, k = 0;

 	width = (image->width + 31) & ~31;
 	dsize = (width * image->height) >> 5;

 	if (info->var.bits_per_pixel == 8) {
 		fg = image->fg_color | mask;
 		bg = image->bg_color | mask;
 	} else {
 		fg = ((u32 *) info->pseudo_palette)[image->fg_color] | mask;
 		bg = ((u32 *) info->pseudo_palette)[image->bg_color] | mask;
 	}

 	NVDmaStart(par, RECT_EXPAND_TWO_COLOR_CLIP, 7);
 	NVDmaNext(par, (image->dy << 16) | (image->dx & 0xffff));
 	NVDmaNext(par, ((image->dy + image->height) << 16) |
 		  ((image->dx + image->width) & 0xffff));
 	NVDmaNext(par, bg);
 	NVDmaNext(par, fg);
 	NVDmaNext(par, (image->height << 16) | width);
 	NVDmaNext(par, (image->height << 16) | width);
 	NVDmaNext(par, (image->dy << 16) | (image->dx & 0xffff));

 	while (dsize >= RECT_EXPAND_TWO_COLOR_DATA_MAX_DWORDS) {
 		NVDmaStart(par, RECT_EXPAND_TWO_COLOR_DATA(0),
 			   RECT_EXPAND_TWO_COLOR_DATA_MAX_DWORDS);

 		for (j = RECT_EXPAND_TWO_COLOR_DATA_MAX_DWORDS; j--;) {
 			tmp = data[k++];
 			reverse_order(&tmp);
 			NVDmaNext(par, tmp);
 		}

 		dsize -= RECT_EXPAND_TWO_COLOR_DATA_MAX_DWORDS;
 	}

 	if (dsize) {
 		NVDmaStart(par, RECT_EXPAND_TWO_COLOR_DATA(0), dsize);

 		for (j = dsize; j--;) {
 			tmp = data[k++];
 			reverse_order(&tmp);
 			NVDmaNext(par, tmp);
 		}
 	}

 	NVDmaKickoff(par);
 }

 void nvidiafb_imageblit(struct fb_info *info, const struct fb_image *image)
 {
 	struct nvidia_par *par = info->par;

 	if (image->depth == 1 && !par->lockup)
 		nvidiafb_mono_color_expand(info, image);
 	else
 		cfb_imageblit(info, image);
 }
	/***************************************************************************\
	\|* *\|
	\|* Copyright 1993-2003 NVIDIA, Corporation. All rights reserved. *\|
	\|* *\|
	\|* NOTICE TO USER: The source code is copyrighted under U.S. and *\|
	\|* international laws. Users and possessors of this source code are *\|
	\|* hereby granted a nonexclusive, royalty-free copyright license to *\|
	\|* use this code in individual and commercial software. *\|
	\|* *\|
	\|* Any use of this source code must include, in the user documenta- *\|
	\|* tion and internal comments to the code, notices to the end user *\|
	\|* as follows: *\|
	\|* *\|
	\|* Copyright 1993-2003 NVIDIA, Corporation. All rights reserved. *\|
	\|* *\|
	\|* NVIDIA, CORPORATION MAKES NO REPRESENTATION ABOUT THE SUITABILITY *\|
	\|* OF THIS SOURCE CODE FOR ANY PURPOSE. IT IS PROVIDED "AS IS" *\|
	\|* WITHOUT EXPRESS OR IMPLIED WARRANTY OF ANY KIND. NVIDIA, CORPOR- *\|
	\|* ATION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOURCE CODE, *\|
	\|* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGE- *\|
	\|* MENT, AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL *\|
	\|* NVIDIA, CORPORATION BE LIABLE FOR ANY SPECIAL, INDIRECT, INCI- *\|
	\|* DENTAL, OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RE- *\|
	\|* SULTING 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 SOURCE CODE. *\|
	\|* *\|
	\|* U.S. Government End Users. This source code is a "commercial *\|
	\|* item," as that term is defined at 48 C.F.R. 2.101 (OCT 1995), *\|
	\|* consisting of "commercial computer software" and "commercial *\|
	\|* computer software documentation," as such terms are used in *\|
	\|* 48 C.F.R. 12.212 (SEPT 1995) and is provided to the U.S. Govern- *\|
	\|* ment only as a commercial end item. Consistent with 48 C.F.R. *\|
	\|* 12.212 and 48 C.F.R. 227.7202-1 through 227.7202-4 (JUNE 1995), *\|
	\|* all U.S. Government End Users acquire the source code with only *\|
	\|* those rights set forth herein. *\|
	\|* *\|
	\***************************************************************************/

	/*
	* GPL Licensing Note - According to Mark Vojkovich, author of the Xorg/
	* XFree86 'nv' driver, this source code is provided under MIT-style licensing
	* where the source code is provided "as is" without warranty of any kind.
	* The only usage restriction is for the copyright notices to be retained
	* whenever code is used.
	*
	* Antonino Daplas <adaplas@pol.net> 2005-03-11
	*/

	#include <linux/fb.h>
	#include "nv_type.h"
	#include "nv_proto.h"
	#include "nv_dma.h"
	#include "nv_local.h"

	/* There is a HW race condition with videoram command buffers.
	You can't jump to the location of your put offset. We write put
	at the jump offset + SKIPS dwords with noop padding in between
	to solve this problem */
	#define SKIPS 8

	static const int NVCopyROP[16] = {
	0xCC, /* copy */
	0x55 /* invert */
	};

	static const int NVCopyROP_PM[16] = {
	0xCA, /* copy */
	0x5A, /* invert */
	};

	static inline void NVFlush(struct nvidia_par *par)
	{
	int count = 1000000000;

	while (--count && READ_GET(par) != par->dmaPut) ;

	if (!count) {
	printk("nvidiafb: DMA Flush lockup\n");
	par->lockup = 1;
	}
	}

	static inline void NVSync(struct nvidia_par *par)
	{
	int count = 1000000000;

	while (--count && NV_RD32(par->PGRAPH, 0x0700)) ;

	if (!count) {
	printk("nvidiafb: DMA Sync lockup\n");
	par->lockup = 1;
	}
	}

	static void NVDmaKickoff(struct nvidia_par *par)
	{
	if (par->dmaCurrent != par->dmaPut) {
	par->dmaPut = par->dmaCurrent;
	WRITE_PUT(par, par->dmaPut);
	}
	}

	static void NVDmaWait(struct nvidia_par *par, int size)
	{
	int dmaGet;
	int count = 1000000000, cnt;
	size++;

	while (par->dmaFree < size && --count && !par->lockup) {
	dmaGet = READ_GET(par);

	if (par->dmaPut >= dmaGet) {
	par->dmaFree = par->dmaMax - par->dmaCurrent;
	if (par->dmaFree < size) {
	NVDmaNext(par, 0x20000000);
	if (dmaGet <= SKIPS) {
	if (par->dmaPut <= SKIPS)
	WRITE_PUT(par, SKIPS + 1);
	cnt = 1000000000;
	do {
	dmaGet = READ_GET(par);
	} while (--cnt && dmaGet <= SKIPS);
	if (!cnt) {
	printk("DMA Get lockup\n");
	par->lockup = 1;
	}
	}
	WRITE_PUT(par, SKIPS);
	par->dmaCurrent = par->dmaPut = SKIPS;
	par->dmaFree = dmaGet - (SKIPS + 1);
	}
	} else
	par->dmaFree = dmaGet - par->dmaCurrent - 1;
	}

	if (!count) {
	printk("DMA Wait Lockup\n");
	par->lockup = 1;
	}
	}

	static void NVSetPattern(struct nvidia_par *par, u32 clr0, u32 clr1,
	u32 pat0, u32 pat1)
	{
	NVDmaStart(par, PATTERN_COLOR_0, 4);
	NVDmaNext(par, clr0);
	NVDmaNext(par, clr1);
	NVDmaNext(par, pat0);
	NVDmaNext(par, pat1);
	}

	static void NVSetRopSolid(struct nvidia_par *par, u32 rop, u32 planemask)
	{
	if (planemask != ~0) {
	NVSetPattern(par, 0, planemask, ~0, ~0);
	if (par->currentRop != (rop + 32)) {
	NVDmaStart(par, ROP_SET, 1);
	NVDmaNext(par, NVCopyROP_PM[rop]);
	par->currentRop = rop + 32;
	}
	} else if (par->currentRop != rop) {
	if (par->currentRop >= 16)
	NVSetPattern(par, ~0, ~0, ~0, ~0);
	NVDmaStart(par, ROP_SET, 1);
	NVDmaNext(par, NVCopyROP[rop]);
	par->currentRop = rop;
	}
	}

	static void NVSetClippingRectangle(struct fb_info *info, int x1, int y1,
	int x2, int y2)
	{
	struct nvidia_par *par = info->par;
	int h = y2 - y1 + 1;
	int w = x2 - x1 + 1;

	NVDmaStart(par, CLIP_POINT, 2);
	NVDmaNext(par, (y1 << 16) \| x1);
	NVDmaNext(par, (h << 16) \| w);
	}

	void NVResetGraphics(struct fb_info *info)
	{
	struct nvidia_par *par = info->par;
	u32 surfaceFormat, patternFormat, rectFormat, lineFormat;
	int pitch, i;

	pitch = info->fix.line_length;

	par->dmaBase = (u32 __iomem *) (&par->FbStart[par->FbUsableSize]);

	for (i = 0; i < SKIPS; i++)
	NV_WR32(&par->dmaBase[i], 0, 0x00000000);

	NV_WR32(&par->dmaBase[0x0 + SKIPS], 0, 0x00040000);
	NV_WR32(&par->dmaBase[0x1 + SKIPS], 0, 0x80000010);
	NV_WR32(&par->dmaBase[0x2 + SKIPS], 0, 0x00042000);
	NV_WR32(&par->dmaBase[0x3 + SKIPS], 0, 0x80000011);
	NV_WR32(&par->dmaBase[0x4 + SKIPS], 0, 0x00044000);
	NV_WR32(&par->dmaBase[0x5 + SKIPS], 0, 0x80000012);
	NV_WR32(&par->dmaBase[0x6 + SKIPS], 0, 0x00046000);
	NV_WR32(&par->dmaBase[0x7 + SKIPS], 0, 0x80000013);
	NV_WR32(&par->dmaBase[0x8 + SKIPS], 0, 0x00048000);
	NV_WR32(&par->dmaBase[0x9 + SKIPS], 0, 0x80000014);
	NV_WR32(&par->dmaBase[0xA + SKIPS], 0, 0x0004A000);
	NV_WR32(&par->dmaBase[0xB + SKIPS], 0, 0x80000015);
	NV_WR32(&par->dmaBase[0xC + SKIPS], 0, 0x0004C000);
	NV_WR32(&par->dmaBase[0xD + SKIPS], 0, 0x80000016);
	NV_WR32(&par->dmaBase[0xE + SKIPS], 0, 0x0004E000);
	NV_WR32(&par->dmaBase[0xF + SKIPS], 0, 0x80000017);

	par->dmaPut = 0;
	par->dmaCurrent = 16 + SKIPS;
	par->dmaMax = 8191;
	par->dmaFree = par->dmaMax - par->dmaCurrent;

	switch (info->var.bits_per_pixel) {
	case 32:
	case 24:
	surfaceFormat = SURFACE_FORMAT_DEPTH24;
	patternFormat = PATTERN_FORMAT_DEPTH24;
	rectFormat = RECT_FORMAT_DEPTH24;
	lineFormat = LINE_FORMAT_DEPTH24;
	break;
	case 16:
	surfaceFormat = SURFACE_FORMAT_DEPTH16;
	patternFormat = PATTERN_FORMAT_DEPTH16;
	rectFormat = RECT_FORMAT_DEPTH16;
	lineFormat = LINE_FORMAT_DEPTH16;
	break;
	default:
	surfaceFormat = SURFACE_FORMAT_DEPTH8;
	patternFormat = PATTERN_FORMAT_DEPTH8;
	rectFormat = RECT_FORMAT_DEPTH8;
	lineFormat = LINE_FORMAT_DEPTH8;
	break;
	}

	NVDmaStart(par, SURFACE_FORMAT, 4);
	NVDmaNext(par, surfaceFormat);
	NVDmaNext(par, pitch \| (pitch << 16));
	NVDmaNext(par, 0);
	NVDmaNext(par, 0);

	NVDmaStart(par, PATTERN_FORMAT, 1);
	NVDmaNext(par, patternFormat);

	NVDmaStart(par, RECT_FORMAT, 1);
	NVDmaNext(par, rectFormat);

	NVDmaStart(par, LINE_FORMAT, 1);
	NVDmaNext(par, lineFormat);

	par->currentRop = ~0; /* set to something invalid */
	NVSetRopSolid(par, ROP_COPY, ~0);

	NVSetClippingRectangle(info, 0, 0, info->var.xres_virtual,
	info->var.yres_virtual);

	NVDmaKickoff(par);
	}

	u8 byte_rev[256] = {
	0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
	0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
	0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
	0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
	0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
	0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
	0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
	0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
	0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
	0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
	0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
	0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
	0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
	0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
	0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
	0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
	0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
	0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
	0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
	0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
	0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
	0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
	0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
	0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
	0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
	0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
	0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
	0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
	0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
	0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
	0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
	0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
	};

	int nvidiafb_sync(struct fb_info *info)
	{
	struct nvidia_par *par = info->par;

	if (!par->lockup)
	NVFlush(par);

	if (!par->lockup)
	NVSync(par);

	return 0;
	}

	void nvidiafb_copyarea(struct fb_info info, const struct fb_copyarea region)
	{
	struct nvidia_par *par = info->par;

	if (par->lockup)
	return cfb_copyarea(info, region);

	NVDmaStart(par, BLIT_POINT_SRC, 3);
	NVDmaNext(par, (region->sy << 16) \| region->sx);
	NVDmaNext(par, (region->dy << 16) \| region->dx);
	NVDmaNext(par, (region->height << 16) \| region->width);

	NVDmaKickoff(par);
	}

	void nvidiafb_fillrect(struct fb_info info, const struct fb_fillrect rect)
	{
	struct nvidia_par *par = info->par;
	u32 color;

	if (par->lockup)
	return cfb_fillrect(info, rect);

	if (info->var.bits_per_pixel == 8)
	color = rect->color;
	else
	color = ((u32 *) info->pseudo_palette)[rect->color];

	if (rect->rop != ROP_COPY)
	NVSetRopSolid(par, rect->rop, ~0);

	NVDmaStart(par, RECT_SOLID_COLOR, 1);
	NVDmaNext(par, color);

	NVDmaStart(par, RECT_SOLID_RECTS(0), 2);
	NVDmaNext(par, (rect->dx << 16) \| rect->dy);
	NVDmaNext(par, (rect->width << 16) \| rect->height);

	NVDmaKickoff(par);

	if (rect->rop != ROP_COPY)
	NVSetRopSolid(par, ROP_COPY, ~0);
	}

	static void nvidiafb_mono_color_expand(struct fb_info *info,
	const struct fb_image *image)
	{
	struct nvidia_par *par = info->par;
	u32 fg, bg, mask = ~(~0 >> (32 - info->var.bits_per_pixel));
	u32 dsize, width, data = (u32 ) image->data, tmp;
	int j, k = 0;

	width = (image->width + 31) & ~31;
	dsize = (width * image->height) >> 5;

	if (info->var.bits_per_pixel == 8) {
	fg = image->fg_color \| mask;
	bg = image->bg_color \| mask;
	} else {
	fg = ((u32 *) info->pseudo_palette)[image->fg_color] \| mask;
	bg = ((u32 *) info->pseudo_palette)[image->bg_color] \| mask;
	}

	NVDmaStart(par, RECT_EXPAND_TWO_COLOR_CLIP, 7);
	NVDmaNext(par, (image->dy << 16) \| (image->dx & 0xffff));
	NVDmaNext(par, ((image->dy + image->height) << 16) \|
	((image->dx + image->width) & 0xffff));
	NVDmaNext(par, bg);
	NVDmaNext(par, fg);
	NVDmaNext(par, (image->height << 16) \| width);
	NVDmaNext(par, (image->height << 16) \| width);
	NVDmaNext(par, (image->dy << 16) \| (image->dx & 0xffff));

	while (dsize >= RECT_EXPAND_TWO_COLOR_DATA_MAX_DWORDS) {
	NVDmaStart(par, RECT_EXPAND_TWO_COLOR_DATA(0),
	RECT_EXPAND_TWO_COLOR_DATA_MAX_DWORDS);

	for (j = RECT_EXPAND_TWO_COLOR_DATA_MAX_DWORDS; j--;) {
	tmp = data[k++];
	reverse_order(&tmp);
	NVDmaNext(par, tmp);
	}

	dsize -= RECT_EXPAND_TWO_COLOR_DATA_MAX_DWORDS;
	}

	if (dsize) {
	NVDmaStart(par, RECT_EXPAND_TWO_COLOR_DATA(0), dsize);

	for (j = dsize; j--;) {
	tmp = data[k++];
	reverse_order(&tmp);
	NVDmaNext(par, tmp);
	}
	}

	NVDmaKickoff(par);
	}

	void nvidiafb_imageblit(struct fb_info info, const struct fb_image image)
	{
	struct nvidia_par *par = info->par;

	if (image->depth == 1 && !par->lockup)
	nvidiafb_mono_color_expand(info, image);
	else
	cfb_imageblit(info, image);
	}