path: root/drivers/video/cyblafb.c

/*
 * Frame buffer driver for Trident Cyberblade/i1 graphics core
 *
 * Copyright 2005 Knut Petersen <Knut_Petersen@t-online.de>
 *
 * CREDITS:
 *	tridentfb.c by Jani Monoses
 *	see files above for further credits
 *
 * TODO:
 *
 */

#define CYBLAFB_DEBUG 0

#include <linux/config.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <asm/types.h>
#include <video/cyblafb.h>

#define VERSION "0.54"

struct cyblafb_par {
	u32 pseudo_pal[16];
	struct fb_ops ops;
};

static struct fb_fix_screeninfo cyblafb_fix __devinitdata = {
	.id = "CyBla",
	.type = FB_TYPE_PACKED_PIXELS,
	.ypanstep = 1,
	.visual = FB_VISUAL_PSEUDOCOLOR,
	.accel = FB_ACCEL_NONE,
};

static char *mode __devinitdata = NULL;
static int bpp __devinitdata = 8;
static int ref __devinitdata = 75;
static int fp __devinitdata;
static int crt __devinitdata;
static int memsize __devinitdata;
static int vesafb __devinitdata;

static int nativex;
static int center;
static int stretch;
static int pciwb = 1;
static int pcirb = 1;
static int pciwr = 1;
static int pcirr = 1;
static int verbosity;
static int displaytype;

static void __iomem * io_virt; // iospace virtual memory address

module_param(mode,charp,0);
module_param(bpp,int,0);
module_param(ref,int,0);
module_param(fp,int,0);
module_param(crt,int,0);
module_param(nativex,int,0);
module_param(center,int,0);
module_param(stretch,int,0);
module_param(pciwb,int,0);
module_param(pcirb,int,0);
module_param(pciwr,int,0);
module_param(pcirr,int,0);
module_param(memsize,int,0);
module_param(verbosity,int,0);
module_param(vesafb,int,0);

//=========================================
//
// Port access macros for memory mapped io
//
//=========================================

#define out8(r,v) writeb(v,io_virt+r)
#define out32(r,v) writel(v,io_virt+r)
#define in8(r) readb(io_virt+r)
#define in32(r) readl(io_virt+r)

//======================================
//
// Hardware access inline functions
//
//======================================

static inline unsigned char read3X4(int reg)
{
	out8(0x3D4,reg);
	return in8(0x3D5);
}

static inline unsigned char read3C4(int reg)
{
	out8(0x3C4,reg);
	return in8(0x3C5);
}

static inline unsigned char read3CE(int reg)
{
	out8(0x3CE,reg);
	return in8(0x3CF);
}

static inline void write3X4(int reg,unsigned char val)
{
	out8(0x3D4,reg);
	out8(0x3D5,val);
}

static inline void write3C4(int reg,unsigned char val)
{
	out8(0x3C4,reg);
	out8(0x3C5,val);
}

static inline void write3CE(int reg,unsigned char val)
{
	out8(0x3CE,reg);
	out8(0x3CF,val);
}

static inline void write3C0(int reg,unsigned char val)
{
	in8(0x3DA);	// read to reset index
	out8(0x3C0,reg);
	out8(0x3C0,val);
}

//=================================================
//
// Enable memory mapped io and unprotect registers
//
//=================================================

static inline void enable_mmio(void)
{
	int tmp;

	outb(0x0B,0x3C4);
	inb(0x3C5);		// Set NEW mode
	outb(SR0E,0x3C4);	// write enable a lot of extended ports
	outb(0x80,0x3C5);

	outb(SR11,0x3C4);	// write enable those extended ports that
	outb(0x87,0x3C5);	// are not affected by SR0E_New

	outb(CR1E,0x3d4);	// clear write protect bit for port 0x3c2
	tmp=inb(0x3d5) & 0xBF;
	outb(CR1E,0x3d4);
	outb(tmp,0x3d5);

	outb(CR39,0x3D4);
	outb(inb(0x3D5)|0x01,0x3D5); // Enable mmio, everything else untouched
}

//=================================================
//
// Set pixel clock VCLK1
//   - multipliers set elswhere
//   - freq in units of 0.01 MHz
//
//=================================================

static void set_vclk(struct cyblafb_par *par, int freq)
{
	u32 m,n,k;
	int f,fi,d,di;
	u8 lo=0,hi=0;

	d = 2000;
	k = freq >= 10000 ? 0 : freq >= 5000 ? 1 : freq >= 2500 ? 2 : 3;
	for(m = 0;m<64;m++)
	for(n = 0;n<250;n++) { // max 249 is a hardware limit for cybla/i1 !
		fi = (int)(((5864727*(n+8))/((m+2)*(1<<k)))>>12);
		if ((di = abs(fi - freq)) < d) {
			d = di;
			f = fi;
			lo = (u8) n;
			hi = (u8) ((k<<6) | m);
		}
	}
	write3C4(SR19,hi);
	write3C4(SR18,lo);
	if(verbosity > 1)
		output("pixclock = %d.%02d MHz, k/m/n %x %x %x\n",
		freq/100,freq%100,(hi&0xc0)>>6,hi&0x3f,lo);
}

//================================================
//
// Cyberblade specific Graphics Engine (GE) setup
//
//================================================

static void cyblafb_setup_GE(int pitch,int bpp)
{
	int base = (pitch>>3)<<20;

	switch (bpp) {
		case  8: base |= (0<<29); break;
		case 15: base |= (5<<29); break;
		case 16: base |= (1<<29); break;
		case 24:
		case 32: base |= (2<<29); break;
	}

	write3X4(CR36,0x90);	// reset GE
	write3X4(CR36,0x80);	// enable GE

	out32(GE24,1<<7);	// reset all GE pointers
	out32(GE24,0);

	write3X4(CR2D,0x00);	// GE Timinigs, no delays

	out32(GEB8,base); // Destination Stride / Buffer Base 0, p 133
	out32(GEBC,base); // Destination Stride / Buffer Base 1, p 133
	out32(GEC0,base); // Destination Stride / Buffer Base 2, p 133
	out32(GEC4,base); // Destination Stride / Buffer Base 3, p 133
	out32(GEC8,base); // Source Stride / Buffer Base 0, p 133
	out32(GECC,base); // Source Stride / Buffer Base 1, p 133
	out32(GED0,base); // Source Stride / Buffer Base 2, p 133
	out32(GED4,base); // Source Stride / Buffer Base 3, p 133
	out32(GE6C,0);	  // Pattern and Style, p 129, ok
}

//=====================================================================
//
// Although this is a .fb_sync function that could be enabled in
// cyblafb_ops, we do not include it there. We sync immediately before
// new GE operations to improve performance.
//
//=====================================================================

static int cyblafb_sync(struct fb_info *info)
{
	int status, i=100000;
	while( ((status=in32(GE20)) & 0xFA800000) && i != 0)
		i--;

	if (i == 0) {
		// The timeout might be caused by disabled mmio.
		// Cause:
		//   - bit CR39 & 1 == 0 upon return, X trident driver bug
		//   - kdm bug (KD_GRAPHICS not set on first switch)
		//   - kernel design flaw (it believes in the correctness
		//     of kdm/X
		// So we make sure that mmio is enabled first ...
		enable_mmio();
//		show_trace(NULL,&status);
		i=1000000;
		while( ((status=in32(GE20)) & 0xFA800000) && i != 0)
			i--;
		if (i == 0) {
			output("GE Timeout, status: %x\n",status);
			if(status & 0x80000000)
				output("Bresenham Engine : Busy\n");
			if(status & 0x40000000)
				output("Setup Engine     : Busy\n");
			if(status & 0x20000000)
				output("SP / DPE         : Busy\n");
			if(status & 0x10000000)
				output("Memory Interface : Busy\n");
			if(status & 0x08000000)
				output("Com Lst Proc     : Busy\n");
			if(status & 0x04000000)
				output("Block Write      : Busy\n");
			if(status & 0x02000000)
				output("Command Buffer   : Full\n");
			if(status & 0x01000000)
				output("RESERVED         : Busy\n");
			if(status & 0x00800000)
				output("PCI Write Buffer : Busy\n");
			cyblafb_setup_GE(info->var.xres,
					 info->var.bits_per_pixel);
		}
	}

	return 0;
}

//==============================
//
// Cyberblade specific fillrect
//
//==============================

static void cyblafb_fillrect(struct fb_info * info,
			     const struct fb_fillrect *fr)
{
	int bpp = info->var.bits_per_pixel;
	int col;

	switch (bpp) {
		default:
		case 8: col = fr->color;
			col |= col <<8;
			col |= col <<16;
			break;
		case 16: col = ((u32 *)(info->pseudo_palette))[fr->color];
			 col |= col <<16;
			 break;
		case 32: col = ((u32 *)(info->pseudo_palette))[fr->color];
			 break;
	}

	cyblafb_sync(info);

	out32(GE60,col);
	out32(GE48,fr->rop ? 0x66:ROP_S);
	out32(GE44,0x20000000|1<<19|1<<4|2<<2);
	out32(GE08,point(fr->dx,fr->dy));
	out32(GE0C,point(fr->dx+fr->width-1,fr->dy+fr->height-1));

}

//==============================
//
// Cyberblade specific copyarea
//
//==============================

static void cyblafb_copyarea(struct fb_info *info,
			     const struct fb_copyarea *ca)
{
	__u32 s1,s2,d1,d2;
	int direction;

	s1 = point(ca->sx,ca->sy);
	s2 = point(ca->sx+ca->width-1,ca->sy+ca->height-1);
	d1 = point(ca->dx,ca->dy);
	d2 = point(ca->dx+ca->width-1,ca->dy+ca->height-1);
	if ((ca->sy > ca->dy) || ((ca->sy == ca->dy) && (ca->sx > ca->dx)))
		direction = 0;
	else
		direction = 2;

	cyblafb_sync(info);

	out32(GE44,0xa0000000|1<<19|1<<2|direction);
	out32(GE00,direction?s2:s1);
	out32(GE04,direction?s1:s2);
	out32(GE08,direction?d2:d1);
	out32(GE0C,direction?d1:d2);

}

//=======================================================================
//
// Cyberblade specific imageblit
//
// Accelerated for the most usual case, blitting 1-bit deep character
// character images. Everything else is passed to the generic imageblit.
//
//=======================================================================

static void cyblafb_imageblit(struct fb_info *info,
			      const struct fb_image *image)
{

	u32 fgcol, bgcol;

	int i;
	int bpp = info->var.bits_per_pixel;
	int index = 0;
	int index_end=image->height * image->width / 8;
	int width_dds=image->width / 32;
	int width_dbs=image->width % 32;

	if (image->depth != 1 || bpp < 8 || bpp > 32 || bpp % 8 != 0 ||
	    image->width % 8 != 0 || image->width == 0 || image->height == 0) {
		cfb_imageblit(info,image);
		return;
	}

	if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
	    info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
		fgcol = ((u32*)(info->pseudo_palette))[image->fg_color];
		bgcol = ((u32*)(info->pseudo_palette))[image->bg_color];
	} else {
		fgcol = image->fg_color;
		bgcol = image->bg_color;
	}

	switch (bpp) {
		case 8:
			fgcol |= fgcol <<8; fgcol |= fgcol <<16;
			bgcol |= bgcol <<8; bgcol |= bgcol <<16;
			break;
		case 16:
			fgcol |= fgcol <<16;
			bgcol |= bgcol <<16;
			break;
		default:
			 break;
	}

	cyblafb_sync(info);

	out32(GE60,fgcol);
	out32(GE64,bgcol);
	out32(GE44,0xa0000000 | 1<<20 | 1<<19);
	out32(GE08,point(image->dx,image->dy));
	out32(GE0C,point(image->dx+image->width-1,image->dy+image->height-1));

	while(index < index_end) {
		for(i=0;i<width_dds;i++) {
			out32(GE9C,*((u32*) ((u32)image->data + index)));
			index+=4;
		}
		switch(width_dbs) {
		case 0: break;
		case 8:	out32(GE9C,*((u8*)((u32)image->data+index)));
			index+=1;
			break;
		case 16: out32(GE9C,*((u16*)((u32)image->data+index)));
			index+=2;
			break;
		case 24: out32(GE9C,(u32)(*((u16*)((u32)image->data+index))) |
			       (u32)(*((u8*)((u32)image->data+index+2)))<<16);
			index+=3;
			break;
		}
	}
}

//==========================================================
//
// Check if video mode is acceptable. We change var->??? if
// video mode is slightly off or return error otherwise.
// info->??? must not be changed!
//
//==========================================================

static int cyblafb_check_var(struct fb_var_screeninfo *var,
			     struct fb_info *info)
{
	int bpp = var->bits_per_pixel;
	int s,t,maxvyres;

	//
	// we try to support 8, 16, 24 and 32 bpp modes,
	// default to 8
	//
	// there is a 24 bpp mode, but for now we change requests to 32 bpp
	// (This is what tridentfb does ... will be changed in the future)
	//
	//
	if ( bpp % 8 != 0 || bpp < 8 || bpp >32)
		bpp = 8;
	if (bpp == 24 )
		bpp = var->bits_per_pixel = 32;

	//
	// interlaced modes are broken, fail if one is requested
	//
	if (var->vmode & FB_VMODE_INTERLACED)
		return -EINVAL;

	//
	// fail if requested resolution is higher than physical
	// flatpanel resolution
	//
	if ((displaytype == DISPLAY_FP) && nativex && var->xres > nativex)
		return -EINVAL;

	//
	// xres != xres_virtual is broken, fail if such an
	// unusual mode is requested
	//
	if (var->xres != var->xres_virtual)
		return -EINVAL;

	//
	// we do not allow vclk to exceed 230 MHz
	//
	if ((bpp==32 ? 200000000 : 100000000) / var->pixclock > 23000)
		return -EINVAL;

	//
	// calc max yres_virtual that would fit in memory
	// and max yres_virtual that could be used for scrolling
	// and use minimum of the results as maxvyres
	//
	// adjust vyres_virtual to maxvyres if necessary
	// fail if requested yres is bigger than maxvyres
	//
	s = (0x1fffff / (var->xres * bpp/8)) + var->yres;
	t = info->fix.smem_len / (var->xres * bpp/8);
	maxvyres = t < s ? t : s;
	if (maxvyres < var->yres_virtual)
		var->yres_virtual=maxvyres;
	if (maxvyres < var->yres)
		return -EINVAL;

	switch (bpp) {
		case 8:
			var->red.offset = 0;
			var->green.offset = 0;
			var->blue.offset = 0;
			var->red.length = 6;
			var->green.length = 6;
			var->blue.length = 6;
			break;
		case 16:
			var->red.offset = 11;
			var->green.offset = 5;
			var->blue.offset = 0;
			var->red.length = 5;
			var->green.length = 6;
			var->blue.length = 5;
			break;
		case 32:
			var->red.offset = 16;
			var->green.offset = 8;
			var->blue.offset = 0;
			var->red.length = 8;
			var->green.length = 8;
			var->blue.length = 8;
			break;
		default:
			return -EINVAL;
	}

	return 0;

}

//=====================================================================
//
// Pan the display
//
// The datasheets defines crt start address to be 20 bits wide and
// to be programmed to CR0C, CR0D, CR1E and CR27. Actually there is
// CR2B[5] as an undocumented extension bit. Epia BIOS 2.07 does use
// it, so it is also safe to be used here. BTW: datasheet CR0E on page
// 90 really is CR1E, the real CRE is documented on page 72.
//
//=====================================================================

static int cyblafb_pan_display(struct fb_var_screeninfo *var,
			       struct fb_info *info)
{
	unsigned int offset;

	offset=(var->xoffset+(var->yoffset*var->xres))*var->bits_per_pixel/32;
	info->var.xoffset = var->xoffset;
	info->var.yoffset = var->yoffset;

	write3X4(CR0D,offset & 0xFF);
	write3X4(CR0C,(offset & 0xFF00) >> 8);
	write3X4(CR1E,(read3X4(CR1E) & 0xDF) | ((offset & 0x10000) >> 11));
	write3X4(CR27,(read3X4(CR27) & 0xF8) | ((offset & 0xE0000) >> 17));
	write3X4(CR2B,(read3X4(CR2B) & 0xDF) | ((offset & 0x100000) >> 15));

	return 0;
}

//============================================
//
// This will really help in case of a bug ...
// dump most gaphics core registers.
//
//============================================

static void regdump(struct cyblafb_par *par)
{
	int i;

	if (verbosity < 2)
		return;

	printk("\n");
	for(i=0; i<=0xff; i++) {
		outb(i,0x3d4);
		printk("CR%02x=%02x ",i,inb(0x3d5));
		if (i%16==15)
			printk("\n");
	}

	outb(0x30,0x3ce);
	outb(inb(0x3cf) | 0x40,0x3cf);
	for(i=0; i<=0x1f; i++) {
		if (i==0 || (i>2 && i<8) || i==0x10 || i==0x11 || i==0x16) {
			outb(i,0x3d4);
			printk("CR%02x=%02x ",i,inb(0x3d5));
		} else
			printk("------- ");
		if (i%16==15)
			printk("\n");
	}
	outb(0x30,0x3ce);
	outb(inb(0x3cf) & 0xbf,0x3cf);

	printk("\n");
	for(i=0; i<=0x7f; i++) {
		outb(i,0x3ce);
		printk("GR%02x=%02x ",i,inb(0x3cf));
		if (i%16==15)
			printk("\n");
	}

	printk("\n");
	for(i=0; i<=0xff; i++) {
		outb(i,0x3c4);
		printk("SR%02x=%02x ",i,inb(0x3c5));
		if (i%16==15)
			printk("\n");
	}

	printk("\n");
	for(i=0; i <= 0x1F; i++) {
		inb(0x3da); // next access is index!
		outb(i,0x3c0);
		printk("AR%02x=%02x ",i,inb(0x3c1));
		if (i%16==15)
			printk("\n");
	}
	printk("\n");

	inb(0x3DA);			// reset internal flag to 3c0 index
	outb(0x20,0x3C0);		// enable attr

	return;
}

//======================================
//
// Set hardware to requested video mode
//
//======================================

static int cyblafb_set_par(struct fb_info *info)
{
	struct cyblafb_par *par = info->par;
	u32
	htotal,hdispend,hsyncstart,hsyncend,hblankstart,hblankend,preendfetch,
		vtotal,vdispend,vsyncstart,vsyncend,vblankstart,vblankend;
	struct fb_var_screeninfo *var = &info->var;
	int bpp = var->bits_per_pixel;
	int i;

	if (verbosity > 0)
		output("Switching to new mode: "
		       "fbset -g %d %d %d %d %d -t %d %d %d %d %d %d %d\n",
			var->xres,var->yres,var->xres_virtual,
			var->yres_virtual,var->bits_per_pixel,var->pixclock,
			var->left_margin,var->right_margin,var->upper_margin,
			var->lower_margin,var->hsync_len,var->vsync_len);

	htotal = (var->xres + var->left_margin + var->right_margin +
						 var->hsync_len) / 8 - 5;
	hdispend = var->xres/8 - 1;
	hsyncstart = (var->xres + var->right_margin)/8;
	hsyncend = var->hsync_len/8;
	hblankstart = hdispend + 1;
	hblankend = htotal + 3; // should be htotal + 5, bios does it this way
	preendfetch = ((var->xres >> 3) + 1) * ((bpp+1) >> 3);

	vtotal = var->yres + var->upper_margin + var->lower_margin +
						 var->vsync_len - 2;
	vdispend = var->yres - 1;
	vsyncstart = var->yres + var->lower_margin;
	vblankstart = var->yres;
	vblankend = vtotal; // should be vtotal + 2, but bios does it this way
	vsyncend = var->vsync_len;

	enable_mmio();		// necessary! ... check X ...

	write3X4(CR11,read3X4(CR11) & 0x7F); // unlock cr00 .. cr07

	write3CE(GR30,8);

	if ((displaytype == DISPLAY_FP) && var->xres < nativex) {

		// stretch or center ?

		out8(0x3C2,0xEB);

		write3CE(GR30,read3CE(GR30) | 0x81); // shadow mode on

		if (center) {
			write3CE(GR52,(read3CE(GR52) & 0x7C) | 0x80);
			write3CE(GR53,(read3CE(GR53) & 0x7C) | 0x80);
		}
		else if (stretch) {
			write3CE(GR5D,0);
			write3CE(GR52,(read3CE(GR52) & 0x7C) | 1);
			write3CE(GR53,(read3CE(GR53) & 0x7C) | 1);
		}

	} else {
		out8(0x3C2,0x2B);
		write3CE(GR30,8);
	}

	//
	// Setup CRxx regs
	//

	write3X4(CR00,htotal & 0xFF);
	write3X4(CR01,hdispend & 0xFF);
	write3X4(CR02,hblankstart & 0xFF);
	write3X4(CR03,hblankend & 0x1F);
	write3X4(CR04,hsyncstart & 0xFF);
	write3X4(CR05,(hsyncend & 0x1F) | ((hblankend & 0x20)<<2));
	write3X4(CR06,vtotal & 0xFF);
	write3X4(CR07,(vtotal & 0x100) >> 8 |
		      (vdispend & 0x100) >> 7 |
		      (vsyncstart & 0x100) >> 6 |
		      (vblankstart & 0x100) >> 5 |
		      0x10 |
		      (vtotal & 0x200) >> 4 |
		      (vdispend & 0x200) >> 3 |
		      (vsyncstart & 0x200) >> 2);
	write3X4(CR08,0);
	write3X4(CR09,(vblankstart & 0x200) >> 4 | 0x40 |  // FIX !!!
		      ((info->var.vmode & FB_VMODE_DOUBLE) ? 0x80 : 0));
	write3X4(CR0A,0);  // Init to some reasonable default
	write3X4(CR0B,0);  // Init to some reasonable default
	write3X4(CR0C,0);  // Offset 0
	write3X4(CR0D,0);  // Offset 0
	write3X4(CR0E,0);  // Init to some reasonable default
	write3X4(CR0F,0);  // Init to some reasonable default
	write3X4(CR10,vsyncstart & 0xFF);
	write3X4(CR11,(vsyncend & 0x0F));
	write3X4(CR12,vdispend & 0xFF);
	write3X4(CR13,((info->var.xres * bpp)/(4*16)) & 0xFF);
	write3X4(CR14,0x40);  // double word mode
	write3X4(CR15,vblankstart & 0xFF);
	write3X4(CR16,vblankend & 0xFF);
	write3X4(CR17,0xC3);
	write3X4(CR18,0xFF);
	//	 CR19: needed for interlaced modes ... ignore it for now
	write3X4(CR1A,0x07); // Arbitration Control Counter 1
	write3X4(CR1B,0x07); // Arbitration Control Counter 2
	write3X4(CR1C,0x07); // Arbitration Control Counter 3
	write3X4(CR1D,0x00); // Don't know, doesn't hurt ;-)
	write3X4(CR1E,(info->var.vmode & FB_VMODE_INTERLACED) ? 0x84 : 0x80);
	//	 CR1F: do not set, contains BIOS info about memsize
	write3X4(CR20,0x20); // enabe wr buf, disable 16bit planar mode
	write3X4(CR21,0x20); // enable linear memory access
	//	 CR22: RO cpu latch readback
	//	 CR23: ???
	//	 CR24: RO AR flag state
	//	 CR25: RAMDAC rw timing, pclk buffer tristate control ????
	//	 CR26: ???
	write3X4(CR27,(vdispend & 0x400) >> 6 |
		      (vsyncstart & 0x400) >> 5 |
		      (vblankstart & 0x400) >> 4 |
		      (vtotal & 0x400) >> 3 |
		      0x8);
	//	 CR28: ???
	write3X4(CR29,(read3X4(CR29) & 0xCF) |
		      ((((info->var.xres * bpp) / (4*16)) & 0x300) >>4));
	write3X4(CR2A,read3X4(CR2A) | 0x40);
	write3X4(CR2B,(htotal & 0x100) >> 8 |
		      (hdispend & 0x100) >> 7 |
		      // (0x00 & 0x100) >> 6 |	 hinterlace para bit 8 ???
		      (hsyncstart & 0x100) >> 5 |
		      (hblankstart & 0x100) >> 4);
	//	 CR2C: ???
	//	 CR2D: initialized in cyblafb_setup_GE()
	write3X4(CR2F,0x92); // conservative, better signal quality
	//	 CR30: reserved
	//	 CR31: reserved
	//	 CR32: reserved
	//	 CR33: reserved
	//	 CR34: disabled in CR36
	//	 CR35: disabled in CR36
	//	 CR36: initialized in cyblafb_setup_GE
	//	 CR37: i2c, ignore for now
	write3X4(CR38,(bpp == 8) ? 0x00 :	//
		      (bpp == 16) ? 0x05 :	// highcolor
		      (bpp == 24) ? 0x29 :	// packed 24bit truecolor
		      (bpp == 32) ? 0x09 : 0);	// truecolor, 16 bit pixelbus
	write3X4(CR39,0x01 |			// MMIO enable
		      (pcirb ? 0x02 : 0) | // pci read burst enable
		      (pciwb ? 0x04 : 0)); // pci write burst enable
	write3X4(CR55,0x1F | // pci clocks * 2 for STOP# during 1st data phase
		      (pcirr ? 0x40 : 0) | // pci read retry enable
		      (pciwr ? 0x80 : 0)); // pci write retry enable
	write3X4(CR56,preendfetch >> 8 < 2 ? (preendfetch >> 8 & 0x01)|2 : 0);
	write3X4(CR57,preendfetch >> 8 < 2 ? preendfetch & 0xff : 0);
	write3X4(CR58,0x82);	// Bios does this .... don't know more
	//
	// Setup SRxx regs
	//
	write3C4(SR00,3);
	write3C4(SR01,1);	//set char clock 8 dots wide
	write3C4(SR02,0x0F);	//enable 4 maps needed in chain4 mode
	write3C4(SR03,0);	//no character map select
	write3C4(SR04,0x0E);	//memory mode: ext mem, even, chain4

	out8(0x3C4,0x0b);
	in8(0x3C5);		// Set NEW mode
	write3C4(SR0D,0x00);	// test ... check

	set_vclk(par,(bpp==32 ? 200000000 : 100000000)/
		 info->var.pixclock); //SR18,SR19

	//
	// Setup GRxx regs
	//
	write3CE(GR00,0x00);	// test ... check
	write3CE(GR01,0x00);	// test ... check
	write3CE(GR02,0x00);	// test ... check
	write3CE(GR03,0x00);	// test ... check
	write3CE(GR04,0x00);	// test ... check
	write3CE(GR05,0x40);	// no CGA compat,allow 256 col
	write3CE(GR06,0x05);	// graphics mode
	write3CE(GR07,0x0F);	// planes?
	write3CE(GR08,0xFF);	// test ... check
	write3CE(GR0F,(bpp==32)?0x1A:0x12); // div vclk by 2 if 32bpp, chain4
	write3CE(GR20,0xC0);	// test ... check
	write3CE(GR2F,0xA0);	// PCLK = VCLK, no skew,

	//
	// Setup ARxx regs
	//
	for(i = 0;i < 0x10;i++) // set AR00 .. AR0f
		write3C0(i,i);
	write3C0(AR10,0x41);	// graphics mode and support 256 color modes
	write3C0(AR12,0x0F);	// planes
	write3C0(AR13,0);	// horizontal pel panning
	in8(0x3DA);		// reset internal flag to 3c0 index
	out8(0x3C0,0x20);	// enable attr

	//
	// Setup hidden RAMDAC command register
	//
	in8(0x3C8);  // these reads are
	in8(0x3C6);  // necessary to
	in8(0x3C6);  // unmask the RAMDAC
	in8(0x3C6);  // command reg, otherwise
	in8(0x3C6);  // we would write the pixelmask reg!
	out8(0x3C6,(bpp ==  8) ? 0x00 : 	// 256 colors
		   (bpp == 15) ? 0x10 : 	//
		   (bpp == 16) ? 0x30 : 	// hicolor
		   (bpp == 24) ? 0xD0 : 	// truecolor
		   (bpp == 32) ? 0xD0 : 0);	// truecolor
	in8(0x3C8);

	//
	// GR31 is not mentioned in the datasheet
	//
	if (displaytype == DISPLAY_FP)
		write3CE(GR31,(read3CE(GR31) & 0x8F) |
			 ((info->var.yres > 1024) ? 0x50 :
			 (info->var.yres >   768) ? 0x30 :
			 (info->var.yres >   600) ? 0x20 :
			 (info->var.yres >   480) ? 0x10 : 0));

	info->fix.visual = (bpp == 8) ? FB_VISUAL_PSEUDOCOLOR
				      : FB_VISUAL_TRUECOLOR;
	info->fix.line_length = info->var.xres * (bpp >> 3);
	info->cmap.len = (bpp == 8) ? 256: 16;

	//
	// init acceleration engine
	//
	cyblafb_setup_GE(info->var.xres,info->var.bits_per_pixel);

	regdump(par);

	return 0;
}

//========================
//
// Set one color register
//
//========================

static int cyblafb_setcolreg(unsigned regno, unsigned red, unsigned green,
			     unsigned blue, unsigned transp,
			     struct fb_info *info)
{
	int bpp = info->var.bits_per_pixel;

	if (regno >= info->cmap.len)
		return 1;

	if (bpp == 8) {
		out8(0x3C6,0xFF);
		out8(0x3C8,regno);
		out8(0x3C9,red>>10);
		out8(0x3C9,green>>10);
		out8(0x3C9,blue>>10);

	} else if (bpp == 16)				// RGB 565
		((u32*)info->pseudo_palette)[regno] =
			(red & 0xF800) |
			((green & 0xFC00) >> 5) |
			((blue & 0xF800) >> 11);
	else if (bpp == 32)				// ARGB 8888
		((u32*)info->pseudo_palette)[regno] =
			((transp & 0xFF00) <<16) |
			((red & 0xFF00) << 8) |
			((green & 0xFF00)) |
			((blue & 0xFF00)>>8);

	return 0;
}

//==========================================================
//
// Try blanking the screen. For flat panels it does nothing
//
//==========================================================

static int cyblafb_blank(int blank_mode, struct fb_info *info)
{
	unsigned char PMCont,DPMSCont;

	if (displaytype == DISPLAY_FP)
		return 0;

	out8(0x83C8,0x04); 		// DPMS Control
	PMCont = in8(0x83C6) & 0xFC;

	DPMSCont = read3CE(GR23) & 0xFC;

	switch (blank_mode)
	{
	case FB_BLANK_UNBLANK:       // Screen: On, HSync: On, VSync: On
	case FB_BLANK_NORMAL:	     // Screen: Off, HSync: On, VSync: On
		PMCont |= 0x03;
		DPMSCont |= 0x00;
		break;
	case FB_BLANK_HSYNC_SUSPEND: // Screen: Off, HSync: Off, VSync: On
		PMCont |= 0x02;
		DPMSCont |= 0x01;
		break;
	case FB_BLANK_VSYNC_SUSPEND: // Screen: Off, HSync: On, VSync: Off
		PMCont |= 0x02;
		DPMSCont |= 0x02;
		break;
	case FB_BLANK_POWERDOWN:     // Screen: Off, HSync: Off, VSync: Off
		PMCont |= 0x00;
		DPMSCont |= 0x03;
		break;
	}

	write3CE(GR23,DPMSCont);
	out8(0x83C8,4);
	out8(0x83C6,PMCont);
	//
	// let fbcon do a softblank for us
	//
	return (blank_mode == FB_BLANK_NORMAL) ? 1 : 0;
}

static struct fb_ops cyblafb_ops __devinitdata = {
	.owner	= THIS_MODULE,
	.fb_setcolreg = cyblafb_setcolreg,
	.fb_pan_display = cyblafb_pan_display,
	.fb_blank = cyblafb_blank,
	.fb_check_var = cyblafb_check_var,
	.fb_set_par = cyblafb_set_par,
	.fb_fillrect = cyblafb_fillrect,
	.fb_copyarea= cyblafb_copyarea,
	.fb_imageblit = cyblafb_imageblit,
	.fb_cursor = soft_cursor,
};

//==========================================================================
//
// getstartupmode() decides about the inital video mode
//
// There is no reason to use modedb, a lot of video modes there would
// need altered timings to display correctly. So I decided that it is much
// better to provide a limited optimized set of modes plus the option of
// using the mode in effect at startup time (might be selected using the
// vga=??? paramter). After that the user might use fbset to select any
// mode he likes, check_var will not try to alter geometry parameters as
// it would be necessary otherwise.
//
//==========================================================================

static int __devinit getstartupmode(struct fb_info *info)
{
	u32	htotal,hdispend,hsyncstart,hsyncend,hblankstart,hblankend,
		vtotal,vdispend,vsyncstart,vsyncend,vblankstart,vblankend,
		cr00,cr01,cr02,cr03,cr04,cr05,cr2b,
		cr06,cr07,cr09,cr10,cr11,cr12,cr15,cr16,cr27,
		cr38,
		sr0d,sr18,sr19,
		gr0f,
		fi,pxclkdiv,vclkdiv,tmp,i;

	struct modus {
		int xres; int yres; int vyres; int bpp; int pxclk;
		int left_margin; int right_margin; int upper_margin;
		int lower_margin; int hsync_len; int vsync_len;
	}  modedb[5] = {
		{   0,	  0, 8000, 0, 0,   0,  0,  0, 0,   0,  0},
		{ 640,	480, 3756, 0, 0, -40, 24, 17, 0, 216,  3},
		{ 800,	600, 3221, 0, 0,  96, 24, 14, 0, 136, 11},
		{1024,	768, 2815, 0, 0, 144, 24, 29, 0, 120,  3},
		{1280, 1024, 2662, 0, 0, 232, 16, 39, 0, 160,  3}
	};

	outb(0x00,0x3d4); cr00=inb(0x3d5); outb(0x01,0x3d4); cr01=inb(0x3d5);
	outb(0x02,0x3d4); cr02=inb(0x3d5); outb(0x03,0x3d4); cr03=inb(0x3d5);
	outb(0x04,0x3d4); cr04=inb(0x3d5); outb(0x05,0x3d4); cr05=inb(0x3d5);
	outb(0x06,0x3d4); cr06=inb(0x3d5); outb(0x07,0x3d4); cr07=inb(0x3d5);
	outb(0x09,0x3d4); cr09=inb(0x3d5); outb(0x10,0x3d4); cr10=inb(0x3d5);
	outb(0x11,0x3d4); cr11=inb(0x3d5); outb(0x12,0x3d4); cr12=inb(0x3d5);
	outb(0x15,0x3d4); cr15=inb(0x3d5); outb(0x16,0x3d4); cr16=inb(0x3d5);
	outb(0x27,0x3d4); cr27=inb(0x3d5); outb(0x2b,0x3d4); cr2b=inb(0x3d5);
	outb(0x38,0x3d4); cr38=inb(0x3d5); outb(0x0b,0x3c4); inb(0x3c5);
	outb(0x0d,0x3c4); sr0d=inb(0x3c5); outb(0x18,0x3c4); sr18=inb(0x3c5);
	outb(0x19,0x3c4); sr19=inb(0x3c5); outb(0x0f,0x3ce); gr0f=inb(0x3cf);

	htotal	    = cr00 | (cr2b & 0x01) << 8;
	hdispend    = cr01 | (cr2b & 0x02) << 7;
	hblankstart = cr02 | (cr2b & 0x10) << 4;
	hblankend   = (cr03 & 0x1f) | (cr05 & 0x80) >> 2;
	hsyncstart  = cr04 | (cr2b & 0x08) << 5;
	hsyncend    = cr05 & 0x1f;

	modedb[0].xres = hblankstart * 8;
	modedb[0].hsync_len = hsyncend * 8;
	modedb[0].right_margin = hsyncstart * 8 - modedb[0].xres;
	modedb[0].left_margin = (htotal + 5) * 8 - modedb[0].xres -
		modedb[0].right_margin - modedb[0].hsync_len;

	vtotal	    = cr06 | (cr07 & 0x01) << 8 | (cr07 & 0x20) << 4
			   | (cr27 & 0x80) << 3;
	vdispend    = cr12 | (cr07 & 0x02) << 7 | (cr07 & 0x40) << 3
			   | (cr27 & 0x10) << 6;
	vsyncstart  = cr10 | (cr07 & 0x04) << 6 | (cr07 & 0x80) << 2
			   | (cr27 & 0x20) << 5;
	vsyncend    = cr11 & 0x0f;
	vblankstart = cr15 | (cr07 & 0x08) << 5 | (cr09 & 0x20) << 4
			   | (cr27 & 0x40) << 4;
	vblankend   = cr16;

	modedb[0].yres	       = vdispend + 1;
	modedb[0].vsync_len    = vsyncend;
	modedb[0].lower_margin = vsyncstart - modedb[0].yres;
	modedb[0].upper_margin = vtotal - modedb[0].yres -
		modedb[0].lower_margin - modedb[0].vsync_len + 2;

	tmp = cr38 & 0x3c;
	modedb[0].bpp = tmp == 0 ? 8 : tmp == 4 ? 16 : tmp == 28 ? 24 :
			tmp == 8 ? 32 : 8;

	fi = ((5864727*(sr18+8))/(((sr19&0x3f)+2)*(1<<((sr19&0xc0)>>6))))>>12;
	pxclkdiv = ((gr0f & 0x08) >> 3 | (gr0f & 0x40) >> 5) + 1;
	tmp = sr0d & 0x06;
	vclkdiv = tmp == 0 ? 2 : tmp == 2 ? 4 : tmp == 4 ? 8 : 3; // * 2 !
	modedb[0].pxclk = ((100000000 * pxclkdiv * vclkdiv) >> 1) / fi;

	if (verbosity > 0)
		output("detected startup mode: "
		       "fbset -g %d %d %d ??? %d -t %d %d %d %d %d %d %d\n",
		       modedb[0].xres,modedb[0].yres,modedb[0].xres,
		       modedb[0].bpp,modedb[0].pxclk,modedb[0].left_margin,
		       modedb[0].right_margin,modedb[0].upper_margin,
		       modedb[0].lower_margin,modedb[0].hsync_len,
		       modedb[0].vsync_len);

	//
	// We use this goto target in case of a failed check_var. No, I really
	// do not want to do it in another way!
	//

	tryagain:

	i = (mode == NULL) ? 0 :
	    !strncmp(mode,"640x480",7) ? 1 :
	    !strncmp(mode,"800x600",7) ? 2 :
	    !strncmp(mode,"1024x768",8) ? 3 :
	    !strncmp(mode,"1280x1024",9) ? 4 : 0;

	ref = (ref < 50) ? 50 : (ref > 85) ? 85 : ref;

	if(i==0) {
		info->var.pixclock = modedb[i].pxclk;
		info->var.bits_per_pixel = modedb[i].bpp;
	} else {
		info->var.pixclock = (100000000 /
			((modedb[i].left_margin + modedb[i].xres +
			  modedb[i].right_margin + modedb[i].hsync_len
			 ) * (
			  modedb[i].upper_margin + modedb[i].yres +
			  modedb[i].lower_margin + modedb[i].vsync_len
			 ) *
			  ref / 10000
			));
		info->var.bits_per_pixel = bpp;
	}

	info->var.left_margin = modedb[i].left_margin;
	info->var.right_margin = modedb[i].right_margin;
	info->var.xres = modedb[i].xres;
	info->var.xres_virtual = modedb[i].xres;
	info->var.xoffset = 0;
	info->var.hsync_len = modedb[i].hsync_len;
	info->var.upper_margin = modedb[i].upper_margin;
	info->var.yres = modedb[i].yres;
	info->var.yres_virtual = modedb[i].vyres;
	info->var.yoffset = 0;
	info->var.lower_margin = modedb[i].lower_margin;
	info->var.vsync_len = modedb[i].vsync_len;
	info->var.sync = 0;
	info->var.vmode = FB_VMODE_NONINTERLACED;

	if(cyblafb_check_var(&info->var,info)) {
		// 640x480-8@75 should really never fail. One case would
		// be fp == 1 and nativex < 640 ... give up then
		if(i==1 && bpp == 8 && ref == 75){
			output("Can't find a valid mode :-(\n");
			return -EINVAL;
		}
		// Our detected mode is unlikely to fail. If it does,
		// try 640x480-8@75 ...
		if(i==0) {
			mode="640x480";
			bpp=8;
			ref=75;
			output("Detected mode failed check_var! "
			       "Trying 640x480-8@75\n");
			goto tryagain;
		}
		// A specified video mode failed for some reason.
		// Try the startup mode first
		output("Specified mode '%s' failed check! "
			"Falling back to startup mode.\n",mode);
		mode=NULL;
		goto tryagain;
	}

	return 0;

}

//========================================================
//
// Detect activated memory size. Undefined values require
// memsize parameter.
//
//========================================================

static unsigned int __devinit get_memsize(void)
{
	unsigned char tmp;
	unsigned int k;

	if (memsize)
		k = memsize * Kb;
	else {
		tmp = read3X4(CR1F) & 0x0F;
		switch (tmp) {
			case 0x03: k = 1 * Mb; break;
			case 0x07: k = 2 * Mb; break;
			case 0x0F: k = 4 * Mb; break;
			case 0x04: k = 8 * Mb; break;
			default:
				k = 1 * Mb;
				output("Unknown memory size code %x in CR1F."
				       " We default to 1 Mb for now, please"
				       " do provide a memsize parameter!\n",
				       tmp);
		}
	}

	if (verbosity > 0)
		output("framebuffer size = %d Kb\n",k/Kb);
	return k;
}

//=========================================================
//
// Detect if a flat panel monitor connected to the special
// interface is active. Override is possible by fp and crt
// parameters.
//
//=========================================================

static unsigned int __devinit get_displaytype(void)
{
	if (fp)
		return DISPLAY_FP;
	if (crt)
		return DISPLAY_CRT;
	return (read3CE(GR33) & 0x10)?DISPLAY_FP:DISPLAY_CRT;
}

//=====================================
//
// Get native resolution of flat panel
//
//=====================================

static int __devinit get_nativex(void)
{
	int x,y,tmp;

	if (nativex)
		return nativex;

	tmp = (read3CE(GR52) >> 4) & 3;

	switch (tmp) {
		case 0:  x = 1280; y = 1024; break;
		case 2:  x = 1024; y = 768;  break;
		case 3:  x = 800;  y = 600;  break;
		case 4:  x = 1400; y = 1050; break;
		case 1:
		default: x = 640;  y = 480;  break;
	}

	if (verbosity > 0)
		output("%dx%d flat panel found\n",x,y);
	return x;
}

static int __devinit cybla_pci_probe(struct pci_dev * dev,
				     const struct pci_device_id * id)
{
	struct fb_info *info;
	struct cyblafb_par *par;

	info = framebuffer_alloc(sizeof(struct cyblafb_par),&dev->dev);

	if (!info)
		goto errout_alloc;

	par = info->par;
	par->ops = cyblafb_ops;

	info->fix = cyblafb_fix;
	info->fbops = &par->ops;
	info->fix = cyblafb_fix;

	if (pci_enable_device(dev)) {
		output("could not enable device!\n");
		goto errout_enable;
	}

	// might already be requested by vga console or vesafb,
	// so we do care about success
	request_region(0x3c0,32,"cyblafb");

	//
	// Graphics Engine Registers
	//
	request_region(GEBase,0x100,"cyblafb");

	regdump(par);

	enable_mmio();

	// setup MMIO region
	info->fix.mmio_start = pci_resource_start(dev,1);
	info->fix.mmio_len = 0x20000;

	if (!request_mem_region(info->fix.mmio_start,
				info->fix.mmio_len,"cyblafb")) {
		output("request_mem_region failed for mmio region!\n");
		goto errout_mmio_reqmem;
	}

	io_virt = ioremap_nocache(info->fix.mmio_start, info->fix.mmio_len);

	if (!io_virt) {
		output("ioremap failed for mmio region\n");
		goto errout_mmio_remap;
	}

	// setup framebuffer memory ... might already be requested
	// by vesafb. Not to fail in case of an unsuccessful request
	// is useful for the development cycle
	info->fix.smem_start = pci_resource_start(dev,0);
	info->fix.smem_len = get_memsize();

	if (!request_mem_region(info->fix.smem_start,
				info->fix.smem_len,"cyblafb")) {
		output("request_mem_region failed for smem region!\n");
		if (!vesafb)
			goto errout_smem_req;
	}

	info->screen_base = ioremap_nocache(info->fix.smem_start,
					    info->fix.smem_len);

	if (!info->screen_base) {
		output("ioremap failed for smem region\n");
		goto errout_smem_remap;
	}

	displaytype = get_displaytype();

	if(displaytype == DISPLAY_FP)
		nativex = get_nativex();

	//
	// FBINFO_HWACCEL_YWRAP    .... does not work (could be made to work?)
	// FBINFO_PARTIAL_PAN_OK   .... is not ok
	// FBINFO_READS_FAST	   .... is necessary for optimal scrolling
	//
	info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN
		      | FBINFO_HWACCEL_COPYAREA | FBINFO_HWACCEL_FILLRECT
		      | FBINFO_HWACCEL_IMAGEBLIT | FBINFO_READS_FAST;

	info->pseudo_palette = par->pseudo_pal;

	if(getstartupmode(info))
		goto errout_findmode;

	fb_alloc_cmap(&info->cmap,256,0);

	if (register_framebuffer(info)) {
		output("Could not register CyBla framebuffer\n");
		goto errout_register;
	}

	pci_set_drvdata(dev,info);

	//
	// normal exit and error paths
	//

	return 0;

 errout_register:
 errout_findmode:
	iounmap(info->screen_base);
 errout_smem_remap:
	release_mem_region(info->fix.smem_start,
			   info->fix.smem_len);
 errout_smem_req:
	iounmap(io_virt);
 errout_mmio_remap:
	release_mem_region(info->fix.mmio_start,
			   info->fix.mmio_len);
 errout_mmio_reqmem:
//	release_region(0x3c0,32);
 errout_enable:
	framebuffer_release(info);
 errout_alloc:
	output("CyblaFB version %s aborting init.\n",VERSION);
	return -ENODEV;
}

static void __devexit cybla_pci_remove(struct pci_dev *dev)
{
	struct fb_info *info = pci_get_drvdata(dev);

	unregister_framebuffer(info);
	iounmap(io_virt);
	iounmap(info->screen_base);
	release_mem_region(info->fix.smem_start,info->fix.smem_len);
	release_mem_region(info->fix.mmio_start,info->fix.mmio_len);
	fb_dealloc_cmap(&info->cmap);
	framebuffer_release(info);
	output("CyblaFB version %s normal exit.\n",VERSION);
}

//
// List of boards that we are trying to support
//
static struct pci_device_id cybla_devices[] = {
	{PCI_VENDOR_ID_TRIDENT,CYBERBLADEi1,PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{0,}
};

MODULE_DEVICE_TABLE(pci,cybla_devices);

static struct pci_driver cyblafb_pci_driver = {
	.name		= "cyblafb",
	.id_table	= cybla_devices,
	.probe		= cybla_pci_probe,
	.remove 	= __devexit_p(cybla_pci_remove)
};

//=============================================================
//
// kernel command line example:
//
//	video=cyblafb:1280x1024,bpp=16,ref=50 ...
//
// modprobe command line example:
//
//	modprobe cyblafb mode=1280x1024 bpp=16 ref=50 ...
//
//=============================================================

static int __devinit cyblafb_init(void)
{
#ifndef MODULE
	char *options = NULL;
	char *opt;

	if (fb_get_options("cyblafb",&options))
		return -ENODEV;

	if (options && *options)
		while((opt = strsep(&options,",")) != NULL ) {
			if (!*opt) continue;
			else if (!strncmp(opt,"bpp=",4))
				bpp = simple_strtoul(opt+4,NULL,0);
			else if (!strncmp(opt,"ref=",4))
				ref = simple_strtoul(opt+4,NULL,0);
			else if (!strncmp(opt,"fp",2))
				displaytype = DISPLAY_FP;
			else if (!strncmp(opt,"crt",3))
				displaytype = DISPLAY_CRT;
			else if (!strncmp(opt,"nativex=",8))
				nativex = simple_strtoul(opt+8,NULL,0);
			else if (!strncmp(opt,"center",6))
				center = 1;
			else if (!strncmp(opt,"stretch",7))
				stretch = 1;
			else if (!strncmp(opt,"pciwb=",6))
				pciwb = simple_strtoul(opt+6,NULL,0);
			else if (!strncmp(opt,"pcirb=",6))
				pcirb = simple_strtoul(opt+6,NULL,0);
			else if (!strncmp(opt,"pciwr=",6))
				pciwr = simple_strtoul(opt+6,NULL,0);
			else if (!strncmp(opt,"pcirr=",6))
				pcirr = simple_strtoul(opt+6,NULL,0);
			else if (!strncmp(opt,"memsize=",8))
				memsize = simple_strtoul(opt+8,NULL,0);
			else if (!strncmp(opt,"verbosity=",10))
				verbosity = simple_strtoul(opt+10,NULL,0);
			else if (!strncmp(opt,"vesafb",6))
				vesafb = 1;
			else
				mode = opt;
		}
#endif
	output("CyblaFB version %s initializing\n",VERSION);
	return pci_module_init(&cyblafb_pci_driver);
}

static void __exit cyblafb_exit(void)
{
	pci_unregister_driver(&cyblafb_pci_driver);
}

module_init(cyblafb_init);
module_exit(cyblafb_exit);

MODULE_AUTHOR("Knut Petersen <knut_petersen@t-online.de>");
MODULE_DESCRIPTION("Framebuffer driver for Cyberblade/i1 graphics core");
MODULE_LICENSE("GPL");