drivers/video/sis/sis_accel.c - kernel/msm-4.9 - Gitiles

 /*
  * SiS 300/540/630[S]/730[S],
  * SiS 315[E|PRO]/550/[M]650/651/[M]661[F|M]X/740/[M]741[GX]/330/[M]760[GX],
  * XGI V3XT/V5/V8, Z7
  * frame buffer driver for Linux kernels >= 2.4.14 and >=2.6.3
  *
  * 2D acceleration part
  *
  * 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; either version 2 of the named License,
  * or any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
  *
  * Based on the XFree86/X.org driver which is
  *     Copyright (C) 2001-2005 by Thomas Winischhofer, Vienna, Austria
  *
  * Author: Thomas Winischhofer <thomas@winischhofer.net>
  *			(see http://www.winischhofer.net/
  *			for more information and updates)
  */

 #include <linux/version.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/fb.h>
 #include <linux/ioport.h>
 #include <linux/types.h>
 #include <asm/io.h>

 #include "sis.h"
 #include "sis_accel.h"

 static const u8 sisALUConv[] =
 {
     0x00,       /* dest = 0;            0,      GXclear,        0 */
     0x88,       /* dest &= src;         DSa,    GXand,          0x1 */
     0x44,       /* dest = src & ~dest;  SDna,   GXandReverse,   0x2 */
     0xCC,       /* dest = src;          S,      GXcopy,         0x3 */
     0x22,       /* dest &= ~src;        DSna,   GXandInverted,  0x4 */
     0xAA,       /* dest = dest;         D,      GXnoop,         0x5 */
     0x66,       /* dest = ^src;         DSx,    GXxor,          0x6 */
     0xEE,       /* dest |= src;         DSo,    GXor,           0x7 */
     0x11,       /* dest = ~src & ~dest; DSon,   GXnor,          0x8 */
     0x99,       /* dest ^= ~src ;       DSxn,   GXequiv,        0x9 */
     0x55,       /* dest = ~dest;        Dn,     GXInvert,       0xA */
     0xDD,       /* dest = src|~dest ;   SDno,   GXorReverse,    0xB */
     0x33,       /* dest = ~src;         Sn,     GXcopyInverted, 0xC */
     0xBB,       /* dest |= ~src;        DSno,   GXorInverted,   0xD */
     0x77,       /* dest = ~src|~dest;   DSan,   GXnand,         0xE */
     0xFF,       /* dest = 0xFF;         1,      GXset,          0xF */
 };
 /* same ROP but with Pattern as Source */
 static const u8 sisPatALUConv[] =
 {
     0x00,       /* dest = 0;            0,      GXclear,        0 */
     0xA0,       /* dest &= src;         DPa,    GXand,          0x1 */
     0x50,       /* dest = src & ~dest;  PDna,   GXandReverse,   0x2 */
     0xF0,       /* dest = src;          P,      GXcopy,         0x3 */
     0x0A,       /* dest &= ~src;        DPna,   GXandInverted,  0x4 */
     0xAA,       /* dest = dest;         D,      GXnoop,         0x5 */
     0x5A,       /* dest = ^src;         DPx,    GXxor,          0x6 */
     0xFA,       /* dest |= src;         DPo,    GXor,           0x7 */
     0x05,       /* dest = ~src & ~dest; DPon,   GXnor,          0x8 */
     0xA5,       /* dest ^= ~src ;       DPxn,   GXequiv,        0x9 */
     0x55,       /* dest = ~dest;        Dn,     GXInvert,       0xA */
     0xF5,       /* dest = src|~dest ;   PDno,   GXorReverse,    0xB */
     0x0F,       /* dest = ~src;         Pn,     GXcopyInverted, 0xC */
     0xAF,       /* dest |= ~src;        DPno,   GXorInverted,   0xD */
     0x5F,       /* dest = ~src|~dest;   DPan,   GXnand,         0xE */
     0xFF,       /* dest = 0xFF;         1,      GXset,          0xF */
 };

 static const int myrops[] = {
    	3, 10, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3
 };

 /* 300 series ----------------------------------------------------- */
 #ifdef CONFIG_FB_SIS_300
 static void
 SiS300Sync(struct sis_video_info *ivideo)
 {
 	SiS300Idle
 }

 static void
 SiS300SetupForScreenToScreenCopy(struct sis_video_info *ivideo, int xdir, int ydir,
                                  int rop, int trans_color)
 {
 	SiS300SetupDSTColorDepth(ivideo->DstColor);
 	SiS300SetupSRCPitch(ivideo->video_linelength)
 	SiS300SetupDSTRect(ivideo->video_linelength, 0xffff)

 	if(trans_color != -1) {
 		SiS300SetupROP(0x0A)
 		SiS300SetupSRCTrans(trans_color)
 		SiS300SetupCMDFlag(TRANSPARENT_BITBLT)
 	} else {
 	        SiS300SetupROP(sisALUConv[rop])
 	}
 	if(xdir > 0) {
 		SiS300SetupCMDFlag(X_INC)
 	}
 	if(ydir > 0) {
 		SiS300SetupCMDFlag(Y_INC)
 	}
 }

 static void
 SiS300SubsequentScreenToScreenCopy(struct sis_video_info *ivideo, int src_x,
 				   int src_y, int dst_x, int dst_y, int width, int height)
 {
 	u32 srcbase = 0, dstbase = 0;

 	if(src_y >= 2048) {
 		srcbase = ivideo->video_linelength * src_y;
 		src_y = 0;
 	}
 	if(dst_y >= 2048) {
 		dstbase = ivideo->video_linelength * dst_y;
 		dst_y = 0;
 	}

 	SiS300SetupSRCBase(srcbase);
 	SiS300SetupDSTBase(dstbase);

 	if(!(ivideo->CommandReg & X_INC))  {
 		src_x += width-1;
 		dst_x += width-1;
 	}
 	if(!(ivideo->CommandReg & Y_INC))  {
 		src_y += height-1;
 		dst_y += height-1;
 	}
 	SiS300SetupRect(width, height)
 	SiS300SetupSRCXY(src_x, src_y)
 	SiS300SetupDSTXY(dst_x, dst_y)
 	SiS300DoCMD
 }

 static void
 SiS300SetupForSolidFill(struct sis_video_info *ivideo, u32 color, int rop)
 {
 	SiS300SetupPATFG(color)
 	SiS300SetupDSTRect(ivideo->video_linelength, 0xffff)
 	SiS300SetupDSTColorDepth(ivideo->DstColor);
 	SiS300SetupROP(sisPatALUConv[rop])
 	SiS300SetupCMDFlag(PATFG)
 }

 static void
 SiS300SubsequentSolidFillRect(struct sis_video_info *ivideo, int x, int y, int w, int h)
 {
 	u32 dstbase = 0;

 	if(y >= 2048) {
 		dstbase = ivideo->video_linelength * y;
 		y = 0;
 	}
 	SiS300SetupDSTBase(dstbase)
 	SiS300SetupDSTXY(x,y)
 	SiS300SetupRect(w,h)
 	SiS300SetupCMDFlag(X_INC | Y_INC | BITBLT)
 	SiS300DoCMD
 }
 #endif

 /* 315/330/340 series ---------------------------------------------- */

 #ifdef CONFIG_FB_SIS_315
 static void
 SiS310Sync(struct sis_video_info *ivideo)
 {
 	SiS310Idle
 }

 static void
 SiS310SetupForScreenToScreenCopy(struct sis_video_info *ivideo, int rop, int trans_color)
 {
 	SiS310SetupDSTColorDepth(ivideo->DstColor);
 	SiS310SetupSRCPitch(ivideo->video_linelength)
 	SiS310SetupDSTRect(ivideo->video_linelength, 0x0fff)
 	if(trans_color != -1) {
 		SiS310SetupROP(0x0A)
 		SiS310SetupSRCTrans(trans_color)
 		SiS310SetupCMDFlag(TRANSPARENT_BITBLT)
 	} else {
 	        SiS310SetupROP(sisALUConv[rop])
 		/* Set command - not needed, both 0 */
 		/* SiSSetupCMDFlag(BITBLT | SRCVIDEO) */
 	}
 	SiS310SetupCMDFlag(ivideo->SiS310_AccelDepth)
 	/* The chip is smart enough to know the direction */
 }

 static void
 SiS310SubsequentScreenToScreenCopy(struct sis_video_info *ivideo, int src_x, int src_y,
 			 int dst_x, int dst_y, int width, int height)
 {
 	u32 srcbase = 0, dstbase = 0;
 	int mymin = min(src_y, dst_y);
 	int mymax = max(src_y, dst_y);

 	/* Although the chip knows the direction to use
 	 * if the source and destination areas overlap,
 	 * that logic fails if we fiddle with the bitmap
 	 * addresses. Therefore, we check if the source
 	 * and destination blitting areas overlap and
 	 * adapt the bitmap addresses synchronously
 	 * if the coordinates exceed the valid range.
 	 * The the areas do not overlap, we do our
 	 * normal check.
 	 */
 	if((mymax - mymin) < height) {
 		if((src_y >= 2048) || (dst_y >= 2048)) {
 			srcbase = ivideo->video_linelength * mymin;
 			dstbase = ivideo->video_linelength * mymin;
 			src_y -= mymin;
 			dst_y -= mymin;
 		}
 	} else {
 		if(src_y >= 2048) {
 			srcbase = ivideo->video_linelength * src_y;
 			src_y = 0;
 		}
 		if(dst_y >= 2048) {
 			dstbase = ivideo->video_linelength * dst_y;
 			dst_y = 0;
 		}
 	}

 	srcbase += ivideo->video_offset;
 	dstbase += ivideo->video_offset;

 	SiS310SetupSRCBase(srcbase);
 	SiS310SetupDSTBase(dstbase);
 	SiS310SetupRect(width, height)
 	SiS310SetupSRCXY(src_x, src_y)
 	SiS310SetupDSTXY(dst_x, dst_y)
 	SiS310DoCMD
 }

 static void
 SiS310SetupForSolidFill(struct sis_video_info *ivideo, u32 color, int rop)
 {
 	SiS310SetupPATFG(color)
 	SiS310SetupDSTRect(ivideo->video_linelength, 0x0fff)
 	SiS310SetupDSTColorDepth(ivideo->DstColor);
 	SiS310SetupROP(sisPatALUConv[rop])
 	SiS310SetupCMDFlag(PATFG | ivideo->SiS310_AccelDepth)
 }

 static void
 SiS310SubsequentSolidFillRect(struct sis_video_info *ivideo, int x, int y, int w, int h)
 {
 	u32 dstbase = 0;

 	if(y >= 2048) {
 		dstbase = ivideo->video_linelength * y;
 		y = 0;
 	}
 	dstbase += ivideo->video_offset;
 	SiS310SetupDSTBase(dstbase)
 	SiS310SetupDSTXY(x,y)
 	SiS310SetupRect(w,h)
 	SiS310SetupCMDFlag(BITBLT)
 	SiS310DoCMD
 }
 #endif

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

 /* The exported routines */

 int sisfb_initaccel(struct sis_video_info *ivideo)
 {
 #ifdef SISFB_USE_SPINLOCKS
 	spin_lock_init(&ivideo->lockaccel);
 #endif
 	return 0;
 }

 void sisfb_syncaccel(struct sis_video_info *ivideo)
 {
 	if(ivideo->sisvga_engine == SIS_300_VGA) {
 #ifdef CONFIG_FB_SIS_300
 		SiS300Sync(ivideo);
 #endif
 	} else {
 #ifdef CONFIG_FB_SIS_315
 		SiS310Sync(ivideo);
 #endif
 	}
 }

 int fbcon_sis_sync(struct fb_info *info)
 {
 	struct sis_video_info *ivideo = (struct sis_video_info *)info->par;
 	CRITFLAGS

 	if((!ivideo->accel) || (!ivideo->engineok))
 		return 0;

 	CRITBEGIN
 	sisfb_syncaccel(ivideo);
 	CRITEND

 	return 0;
 }

 void fbcon_sis_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
 {
 	struct sis_video_info *ivideo = (struct sis_video_info *)info->par;
 	u32 col = 0;
 	u32 vxres = info->var.xres_virtual;
 	u32 vyres = info->var.yres_virtual;
 	int width, height;
 	CRITFLAGS

 	if(info->state != FBINFO_STATE_RUNNING)
 		return;

 	if((!ivideo->accel) || (!ivideo->engineok)) {
 		cfb_fillrect(info, rect);
 		return;
 	}

 	if(!rect->width || !rect->height || rect->dx >= vxres || rect->dy >= vyres)
 		return;

 	/* Clipping */
 	width = ((rect->dx + rect->width) > vxres) ? (vxres - rect->dx) : rect->width;
 	height = ((rect->dy + rect->height) > vyres) ? (vyres - rect->dy) : rect->height;

 	switch(info->var.bits_per_pixel) {
 	case 8:  col = rect->color;
 		 break;
 	case 16:
 	case 32: col = ((u32 *)(info->pseudo_palette))[rect->color];
 		 break;
 	}

 	if(ivideo->sisvga_engine == SIS_300_VGA) {
 #ifdef CONFIG_FB_SIS_300
 		CRITBEGIN
 		SiS300SetupForSolidFill(ivideo, col, myrops[rect->rop]);
 		SiS300SubsequentSolidFillRect(ivideo, rect->dx, rect->dy, width, height);
 		CRITEND
 #endif
 	} else {
 #ifdef CONFIG_FB_SIS_315
 		CRITBEGIN
 		SiS310SetupForSolidFill(ivideo, col, myrops[rect->rop]);
 		SiS310SubsequentSolidFillRect(ivideo, rect->dx, rect->dy, width, height);
 		CRITEND
 #endif
 	}

 	sisfb_syncaccel(ivideo);
 }

 void fbcon_sis_copyarea(struct fb_info *info, const struct fb_copyarea *area)
 {
 	struct sis_video_info *ivideo = (struct sis_video_info *)info->par;
 	u32 vxres = info->var.xres_virtual;
 	u32 vyres = info->var.yres_virtual;
 	int width = area->width;
 	int height = area->height;
 	CRITFLAGS

 	if(info->state != FBINFO_STATE_RUNNING)
 		return;

 	if((!ivideo->accel) || (!ivideo->engineok)) {
 		cfb_copyarea(info, area);
 		return;
 	}

 	if(!width || !height ||
 	   area->sx >= vxres || area->sy >= vyres ||
 	   area->dx >= vxres || area->dy >= vyres)
 		return;

 	/* Clipping */
 	if((area->sx + width) > vxres) width = vxres - area->sx;
 	if((area->dx + width) > vxres) width = vxres - area->dx;
 	if((area->sy + height) > vyres) height = vyres - area->sy;
 	if((area->dy + height) > vyres) height = vyres - area->dy;

 	if(ivideo->sisvga_engine == SIS_300_VGA) {
 #ifdef CONFIG_FB_SIS_300
 		int xdir, ydir;

 		if(area->sx < area->dx) xdir = 0;
 		else                    xdir = 1;
 		if(area->sy < area->dy) ydir = 0;
 		else                    ydir = 1;

 		CRITBEGIN
 		SiS300SetupForScreenToScreenCopy(ivideo, xdir, ydir, 3, -1);
 		SiS300SubsequentScreenToScreenCopy(ivideo, area->sx, area->sy,
 					area->dx, area->dy, width, height);
 		CRITEND
 #endif
 	} else {
 #ifdef CONFIG_FB_SIS_315
 		CRITBEGIN
 		SiS310SetupForScreenToScreenCopy(ivideo, 3, -1);
 		SiS310SubsequentScreenToScreenCopy(ivideo, area->sx, area->sy,
 					area->dx, area->dy, width, height);
 		CRITEND
 #endif
 	}

 	sisfb_syncaccel(ivideo);
 }
	/*
	* SiS 300/540/630[S]/730[S],
	* SiS 315[E\|PRO]/550/[M]650/651/[M]661[F\|M]X/740/[M]741[GX]/330/[M]760[GX],
	* XGI V3XT/V5/V8, Z7
	* frame buffer driver for Linux kernels >= 2.4.14 and >=2.6.3
	*
	* 2D acceleration part
	*
	* 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; either version 2 of the named License,
	* or any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
	*
	* Based on the XFree86/X.org driver which is
	* Copyright (C) 2001-2005 by Thomas Winischhofer, Vienna, Austria
	*
	* Author: Thomas Winischhofer <thomas@winischhofer.net>
	* (see http://www.winischhofer.net/
	* for more information and updates)
	*/

	#include <linux/version.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/fb.h>
	#include <linux/ioport.h>
	#include <linux/types.h>
	#include <asm/io.h>

	#include "sis.h"
	#include "sis_accel.h"

	static const u8 sisALUConv[] =
	{
	0x00, /* dest = 0; 0, GXclear, 0 */
	0x88, /* dest &= src; DSa, GXand, 0x1 */
	0x44, /* dest = src & ~dest; SDna, GXandReverse, 0x2 */
	0xCC, /* dest = src; S, GXcopy, 0x3 */
	0x22, /* dest &= ~src; DSna, GXandInverted, 0x4 */
	0xAA, /* dest = dest; D, GXnoop, 0x5 */
	0x66, /* dest = ^src; DSx, GXxor, 0x6 */
	0xEE, /* dest \|= src; DSo, GXor, 0x7 */
	0x11, /* dest = ~src & ~dest; DSon, GXnor, 0x8 */
	0x99, /* dest ^= ~src ; DSxn, GXequiv, 0x9 */
	0x55, /* dest = ~dest; Dn, GXInvert, 0xA */
	0xDD, /* dest = src\|~dest ; SDno, GXorReverse, 0xB */
	0x33, /* dest = ~src; Sn, GXcopyInverted, 0xC */
	0xBB, /* dest \|= ~src; DSno, GXorInverted, 0xD */
	0x77, /* dest = ~src\|~dest; DSan, GXnand, 0xE */
	0xFF, /* dest = 0xFF; 1, GXset, 0xF */
	};
	/* same ROP but with Pattern as Source */
	static const u8 sisPatALUConv[] =
	{
	0x00, /* dest = 0; 0, GXclear, 0 */
	0xA0, /* dest &= src; DPa, GXand, 0x1 */
	0x50, /* dest = src & ~dest; PDna, GXandReverse, 0x2 */
	0xF0, /* dest = src; P, GXcopy, 0x3 */
	0x0A, /* dest &= ~src; DPna, GXandInverted, 0x4 */
	0xAA, /* dest = dest; D, GXnoop, 0x5 */
	0x5A, /* dest = ^src; DPx, GXxor, 0x6 */
	0xFA, /* dest \|= src; DPo, GXor, 0x7 */
	0x05, /* dest = ~src & ~dest; DPon, GXnor, 0x8 */
	0xA5, /* dest ^= ~src ; DPxn, GXequiv, 0x9 */
	0x55, /* dest = ~dest; Dn, GXInvert, 0xA */
	0xF5, /* dest = src\|~dest ; PDno, GXorReverse, 0xB */
	0x0F, /* dest = ~src; Pn, GXcopyInverted, 0xC */
	0xAF, /* dest \|= ~src; DPno, GXorInverted, 0xD */
	0x5F, /* dest = ~src\|~dest; DPan, GXnand, 0xE */
	0xFF, /* dest = 0xFF; 1, GXset, 0xF */
	};

	static const int myrops[] = {
	3, 10, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3
	};

	/* 300 series ----------------------------------------------------- */
	#ifdef CONFIG_FB_SIS_300
	static void
	SiS300Sync(struct sis_video_info *ivideo)
	{
	SiS300Idle
	}

	static void
	SiS300SetupForScreenToScreenCopy(struct sis_video_info *ivideo, int xdir, int ydir,
	int rop, int trans_color)
	{
	SiS300SetupDSTColorDepth(ivideo->DstColor);
	SiS300SetupSRCPitch(ivideo->video_linelength)
	SiS300SetupDSTRect(ivideo->video_linelength, 0xffff)

	if(trans_color != -1) {
	SiS300SetupROP(0x0A)
	SiS300SetupSRCTrans(trans_color)
	SiS300SetupCMDFlag(TRANSPARENT_BITBLT)
	} else {
	SiS300SetupROP(sisALUConv[rop])
	}
	if(xdir > 0) {
	SiS300SetupCMDFlag(X_INC)
	}
	if(ydir > 0) {
	SiS300SetupCMDFlag(Y_INC)
	}
	}

	static void
	SiS300SubsequentScreenToScreenCopy(struct sis_video_info *ivideo, int src_x,
	int src_y, int dst_x, int dst_y, int width, int height)
	{
	u32 srcbase = 0, dstbase = 0;

	if(src_y >= 2048) {
	srcbase = ivideo->video_linelength * src_y;
	src_y = 0;
	}
	if(dst_y >= 2048) {
	dstbase = ivideo->video_linelength * dst_y;
	dst_y = 0;
	}

	SiS300SetupSRCBase(srcbase);
	SiS300SetupDSTBase(dstbase);

	if(!(ivideo->CommandReg & X_INC)) {
	src_x += width-1;
	dst_x += width-1;
	}
	if(!(ivideo->CommandReg & Y_INC)) {
	src_y += height-1;
	dst_y += height-1;
	}
	SiS300SetupRect(width, height)
	SiS300SetupSRCXY(src_x, src_y)
	SiS300SetupDSTXY(dst_x, dst_y)
	SiS300DoCMD
	}

	static void
	SiS300SetupForSolidFill(struct sis_video_info *ivideo, u32 color, int rop)
	{
	SiS300SetupPATFG(color)
	SiS300SetupDSTRect(ivideo->video_linelength, 0xffff)
	SiS300SetupDSTColorDepth(ivideo->DstColor);
	SiS300SetupROP(sisPatALUConv[rop])
	SiS300SetupCMDFlag(PATFG)
	}

	static void
	SiS300SubsequentSolidFillRect(struct sis_video_info *ivideo, int x, int y, int w, int h)
	{
	u32 dstbase = 0;

	if(y >= 2048) {
	dstbase = ivideo->video_linelength * y;
	y = 0;
	}
	SiS300SetupDSTBase(dstbase)
	SiS300SetupDSTXY(x,y)
	SiS300SetupRect(w,h)
	SiS300SetupCMDFlag(X_INC \| Y_INC \| BITBLT)
	SiS300DoCMD
	}
	#endif

	/* 315/330/340 series ---------------------------------------------- */

	#ifdef CONFIG_FB_SIS_315
	static void
	SiS310Sync(struct sis_video_info *ivideo)
	{
	SiS310Idle
	}

	static void
	SiS310SetupForScreenToScreenCopy(struct sis_video_info *ivideo, int rop, int trans_color)
	{
	SiS310SetupDSTColorDepth(ivideo->DstColor);
	SiS310SetupSRCPitch(ivideo->video_linelength)
	SiS310SetupDSTRect(ivideo->video_linelength, 0x0fff)
	if(trans_color != -1) {
	SiS310SetupROP(0x0A)
	SiS310SetupSRCTrans(trans_color)
	SiS310SetupCMDFlag(TRANSPARENT_BITBLT)
	} else {
	SiS310SetupROP(sisALUConv[rop])
	/* Set command - not needed, both 0 */
	/* SiSSetupCMDFlag(BITBLT \| SRCVIDEO) */
	}
	SiS310SetupCMDFlag(ivideo->SiS310_AccelDepth)
	/* The chip is smart enough to know the direction */
	}

	static void
	SiS310SubsequentScreenToScreenCopy(struct sis_video_info *ivideo, int src_x, int src_y,
	int dst_x, int dst_y, int width, int height)
	{
	u32 srcbase = 0, dstbase = 0;
	int mymin = min(src_y, dst_y);
	int mymax = max(src_y, dst_y);

	/* Although the chip knows the direction to use
	* if the source and destination areas overlap,
	* that logic fails if we fiddle with the bitmap
	* addresses. Therefore, we check if the source
	* and destination blitting areas overlap and
	* adapt the bitmap addresses synchronously
	* if the coordinates exceed the valid range.
	* The the areas do not overlap, we do our
	* normal check.
	*/
	if((mymax - mymin) < height) {
	if((src_y >= 2048) \|\| (dst_y >= 2048)) {
	srcbase = ivideo->video_linelength * mymin;
	dstbase = ivideo->video_linelength * mymin;
	src_y -= mymin;
	dst_y -= mymin;
	}
	} else {
	if(src_y >= 2048) {
	srcbase = ivideo->video_linelength * src_y;
	src_y = 0;
	}
	if(dst_y >= 2048) {
	dstbase = ivideo->video_linelength * dst_y;
	dst_y = 0;
	}
	}

	srcbase += ivideo->video_offset;
	dstbase += ivideo->video_offset;

	SiS310SetupSRCBase(srcbase);
	SiS310SetupDSTBase(dstbase);
	SiS310SetupRect(width, height)
	SiS310SetupSRCXY(src_x, src_y)
	SiS310SetupDSTXY(dst_x, dst_y)
	SiS310DoCMD
	}

	static void
	SiS310SetupForSolidFill(struct sis_video_info *ivideo, u32 color, int rop)
	{
	SiS310SetupPATFG(color)
	SiS310SetupDSTRect(ivideo->video_linelength, 0x0fff)
	SiS310SetupDSTColorDepth(ivideo->DstColor);
	SiS310SetupROP(sisPatALUConv[rop])
	SiS310SetupCMDFlag(PATFG \| ivideo->SiS310_AccelDepth)
	}

	static void
	SiS310SubsequentSolidFillRect(struct sis_video_info *ivideo, int x, int y, int w, int h)
	{
	u32 dstbase = 0;

	if(y >= 2048) {
	dstbase = ivideo->video_linelength * y;
	y = 0;
	}
	dstbase += ivideo->video_offset;
	SiS310SetupDSTBase(dstbase)
	SiS310SetupDSTXY(x,y)
	SiS310SetupRect(w,h)
	SiS310SetupCMDFlag(BITBLT)
	SiS310DoCMD
	}
	#endif

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

	/* The exported routines */

	int sisfb_initaccel(struct sis_video_info *ivideo)
	{
	#ifdef SISFB_USE_SPINLOCKS
	spin_lock_init(&ivideo->lockaccel);
	#endif
	return 0;
	}

	void sisfb_syncaccel(struct sis_video_info *ivideo)
	{
	if(ivideo->sisvga_engine == SIS_300_VGA) {
	#ifdef CONFIG_FB_SIS_300
	SiS300Sync(ivideo);
	#endif
	} else {
	#ifdef CONFIG_FB_SIS_315
	SiS310Sync(ivideo);
	#endif
	}
	}

	int fbcon_sis_sync(struct fb_info *info)
	{
	struct sis_video_info ivideo = (struct sis_video_info )info->par;
	CRITFLAGS

	if((!ivideo->accel) \|\| (!ivideo->engineok))
	return 0;

	CRITBEGIN
	sisfb_syncaccel(ivideo);
	CRITEND

	return 0;
	}

	void fbcon_sis_fillrect(struct fb_info info, const struct fb_fillrect rect)
	{
	struct sis_video_info ivideo = (struct sis_video_info )info->par;
	u32 col = 0;
	u32 vxres = info->var.xres_virtual;
	u32 vyres = info->var.yres_virtual;
	int width, height;
	CRITFLAGS

	if(info->state != FBINFO_STATE_RUNNING)
	return;

	if((!ivideo->accel) \|\| (!ivideo->engineok)) {
	cfb_fillrect(info, rect);
	return;
	}

	if(!rect->width \|\| !rect->height \|\| rect->dx >= vxres \|\| rect->dy >= vyres)
	return;

	/* Clipping */
	width = ((rect->dx + rect->width) > vxres) ? (vxres - rect->dx) : rect->width;
	height = ((rect->dy + rect->height) > vyres) ? (vyres - rect->dy) : rect->height;

	switch(info->var.bits_per_pixel) {
	case 8: col = rect->color;
	break;
	case 16:
	case 32: col = ((u32 *)(info->pseudo_palette))[rect->color];
	break;
	}

	if(ivideo->sisvga_engine == SIS_300_VGA) {
	#ifdef CONFIG_FB_SIS_300
	CRITBEGIN
	SiS300SetupForSolidFill(ivideo, col, myrops[rect->rop]);
	SiS300SubsequentSolidFillRect(ivideo, rect->dx, rect->dy, width, height);
	CRITEND
	#endif
	} else {
	#ifdef CONFIG_FB_SIS_315
	CRITBEGIN
	SiS310SetupForSolidFill(ivideo, col, myrops[rect->rop]);
	SiS310SubsequentSolidFillRect(ivideo, rect->dx, rect->dy, width, height);
	CRITEND
	#endif
	}

	sisfb_syncaccel(ivideo);
	}

	void fbcon_sis_copyarea(struct fb_info info, const struct fb_copyarea area)
	{
	struct sis_video_info ivideo = (struct sis_video_info )info->par;
	u32 vxres = info->var.xres_virtual;
	u32 vyres = info->var.yres_virtual;
	int width = area->width;
	int height = area->height;
	CRITFLAGS

	if(info->state != FBINFO_STATE_RUNNING)
	return;

	if((!ivideo->accel) \|\| (!ivideo->engineok)) {
	cfb_copyarea(info, area);
	return;
	}

	if(!width \|\| !height \|\|
	area->sx >= vxres \|\| area->sy >= vyres \|\|
	area->dx >= vxres \|\| area->dy >= vyres)
	return;

	/* Clipping */
	if((area->sx + width) > vxres) width = vxres - area->sx;
	if((area->dx + width) > vxres) width = vxres - area->dx;
	if((area->sy + height) > vyres) height = vyres - area->sy;
	if((area->dy + height) > vyres) height = vyres - area->dy;

	if(ivideo->sisvga_engine == SIS_300_VGA) {
	#ifdef CONFIG_FB_SIS_300
	int xdir, ydir;

	if(area->sx < area->dx) xdir = 0;
	else xdir = 1;
	if(area->sy < area->dy) ydir = 0;
	else ydir = 1;

	CRITBEGIN
	SiS300SetupForScreenToScreenCopy(ivideo, xdir, ydir, 3, -1);
	SiS300SubsequentScreenToScreenCopy(ivideo, area->sx, area->sy,
	area->dx, area->dy, width, height);
	CRITEND
	#endif
	} else {
	#ifdef CONFIG_FB_SIS_315
	CRITBEGIN
	SiS310SetupForScreenToScreenCopy(ivideo, 3, -1);
	SiS310SubsequentScreenToScreenCopy(ivideo, area->sx, area->sy,
	area->dx, area->dy, width, height);
	CRITEND
	#endif
	}

	sisfb_syncaccel(ivideo);
	}