[PATCH] framebuffer: new driver for cyberblade/i1 graphics core

This is a framebuffer driver for the Cyberblade/i1 graphics core.

Currently tridenfb claims to support the cyberblade/i1 graphics core.  This
is of very limited truth.  Even vesafb is faster and provides more working
modes and a much better quality of the video signal.  There is a great
number of bugs in tridentfb ...  but most often it is impossible to decide
if these bugs are real bugs or if fixing them for the cyberblade/i1 core
would break support for one of the other supported chips.

Tridentfb seems to be unmaintained,and documentation for most of the
supported chips is not available.  So "fixing" cyberblade/i1 support inside
of tridentfb was not an option, it would have caused numerous
if(CYBERBLADEi1) else ...  cases and would have rendered the code to be
almost unmaintainable.

A first version of this driver was published on 2005-07-31.  A fix for a
bug reported by Jochen Hein was integrated as well as some changes
requested by Antonino A.  Daplas.

A message has been added to tridentfb to inform current users of tridentfb
to switch to cyblafb if the cyberblade/i1 graphics core is detected.

This patch is one logical change, but because of the included documentation
it is bigger than 70kb.  Therefore it is not sent to lkml and
linux-fbdev-devel,

Signed-off-by: Knut Petersen <Knut_Petersen@t-online.de>
Cc: Muli Ben-Yehuda <mulix@mulix.org>
Acked-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 1493 insertions, 2 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index e906b54..e27aefd 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1177,6 +1177,32 @@ config FB_VOODOO1
 	  Please read the <file:Documentation/fb/README-sstfb.txt> for supported
 	  options and other important info  support.
 
+config FB_CYBLA
+	tristate "Cyberblade/i1 support"
+	depends on FB && PCI
+	select FB_CFB_IMAGEBLIT
+	select FB_SOFT_CURSOR
+	select VIDEO_SELECT
+	---help---
+	  This driver is supposed to support the Trident Cyberblade/i1
+	  graphics core integrated in the VIA VT8601A North Bridge,
+	  also known as VIA Apollo PLE133.
+
+	  Status:
+	   - Developed, tested and working on EPIA 5000 and EPIA 800.
+	   - Does work reliable on all systems with CRT/LCD connected to
+	     normal VGA ports.
+	   - Should work on systems that do use the internal LCD port, but
+	     this is absolutely not tested.
+
+	  Character imageblit, copyarea and rectangle fill are hw accelerated,
+	  ypan scrolling is used by default.
+
+	  Please do read <file:Documentation/fb/cyblafb/*>.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called cyblafb.
+
 config FB_TRIDENT
 	tristate "Trident support"
 	depends on FB && PCI
@@ -1190,8 +1216,12 @@ config FB_TRIDENT
 	  but also on some motherboards. For more information, read
 	  <file:Documentation/fb/tridentfb.txt>
 
+	  Cyberblade/i1 support will be removed soon, use the cyblafb driver
+	  instead.
+
 	  Say Y if you have such a graphics board.
 
+
 	  To compile this driver as a module, choose M here: the
 	  module will be called tridentfb.
 
@@ -1202,7 +1232,6 @@ config FB_TRIDENT_ACCEL
 	This will compile the Trident frame buffer device with
 	acceleration functions.
 
-
 config FB_PM3
 	tristate "Permedia3 support"
 	depends on FB && PCI && BROKEN
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index b018df4..8478d21 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -50,7 +50,8 @@ obj-$(CONFIG_FB_CT65550)          += chipsfb.o
 obj-$(CONFIG_FB_IMSTT)            += imsttfb.o
 obj-$(CONFIG_FB_S3TRIO)           += S3triofb.o
 obj-$(CONFIG_FB_FM2)              += fm2fb.o
-obj-$(CONFIG_FB_TRIDENT)	  += tridentfb.o
+obj-$(CONFIG_FB_CYBLA)            += cyblafb.o
+obj-$(CONFIG_FB_TRIDENT)          += tridentfb.o
 obj-$(CONFIG_FB_STI)              += stifb.o
 obj-$(CONFIG_FB_FFB)              += ffb.o sbuslib.o
 obj-$(CONFIG_FB_CG6)              += cg6.o sbuslib.o
diff --git a/drivers/video/cyblafb.c b/drivers/video/cyblafb.c
new file mode 100644
index 0000000..ae2762c
--- /dev/null
+++ b/drivers/video/cyblafb.c
@@ -0,0 +1,1456 @@
+/*
+ * 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");
diff --git a/drivers/video/tridentfb.c b/drivers/video/tridentfb.c
index 698ca92..81a6d9f 100644
--- a/drivers/video/tridentfb.c
+++ b/drivers/video/tridentfb.c
@@ -1061,6 +1061,11 @@ static int __devinit trident_pci_probe(struct pci_dev * dev, const struct pci_de
 
 	chip_id = id->device;
 
+	if(chip_id == CYBERBLADEi1)
+		output("*** Please do use cyblafb, Cyberblade/i1 support "
+		       "will soon be removed from tridentfb!\n");
+
+
 	/* If PCI id is 0x9660 then further detect chip type */
 	
 	if (chip_id == TGUI9660) {