drivers/ct69000.c

/*
 * (C) Copyright 2002
 * Denis Peter, MPL AG Switzerland
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 License, or (at your option) 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
 */

/*
 * ported from ctfb.c (linux kernel) for the U-Boot
 *
 */

/************************************************************************
  Get Parameters for the video mode:
  Parameters can be set via the variable "videomode" in the environment.
  2 diferent ways are possible:
  "videomode=301"   - 301 is a hexadecimal number describing the VESA
                      mode. Following modes are implemented:

                      Colors    640x480 800x600 1024x768 1152x864
                     --------+-----------------------------------
                      8 bits |  0x301   0x303    0x305    0x161
                     15 bits |  0x310   0x313    0x316    0x162
                     16 bits |  0x311   0x314    0x317    0x163
                     24 bits |  0x312   0x315    0x318      ?
                     --------+-----------------------------------
  "videomode=bootargs"
                   - the parameters are parsed from the bootargs.
                      The format is "NAME:VALUE,NAME:VALUE" etc.
                      Ex.:
                      "bootargs=video=ctfb:x:800,y:600,depth:16,pclk:25000"
                      Parameters not included in the list will be taken from
                      the default mode, which is one of the following:
                      mode:0  640x480x24
                      mode:1  800x600x16
                      mode:2  1024x768x8
                      mode:3  960x720x24
                      mode:4  1152x864x16
                      if "mode" is not provided within the parameter list,
                      mode:0 is assumed.
                      Following parameters are supported:
                      x       xres = visible resolution horizontal
                      y       yres = visible resolution vertical
                      pclk    pixelclocks in pico sec
                      le      left_marging time from sync to picture in pixelclocks
                      ri      right_marging time from picture to sync in pixelclocks
                      up      upper_margin time from sync to picture
                      lo      lower_margin
                      hs      hsync_len length of horizontal sync
                      vs      vsync_len length of vertical sync
                      sync    see FB_SYNC_*
                      vmode   see FB_VMODE_*
                      depth   Color depth in bits per pixel
                      All other parameters in the variable bootargs are ignored.
                      It is also possible to set the parameters direct in the
                      variable "videomode", or in another variable i.e.
                      "myvideo" and setting the variable "videomode=myvideo"..
****************************************************************************/

#include <common.h>

#ifdef CONFIG_VIDEO

#include <pci.h>
#include <video_fb.h>

#ifdef CONFIG_VIDEO_CT69000

/* debug */
#undef VGA_DEBUG
#undef VGA_DUMP_REG
#ifdef VGA_DEBUG
#define	PRINTF(fmt,args...)	printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif

/* Macros */
#ifndef min
#define min( a, b ) ( ( a ) < ( b ) ) ? ( a ) : ( b )
#endif
#ifndef max
#define max( a, b ) ( ( a ) > ( b ) ) ? ( a ) : ( b )
#endif
#ifdef minmax
#error "term minmax already used."
#endif
#define minmax( a, x, b ) max( ( a ), min( ( x ), ( b ) ) )
#define N_ELTS( x ) ( sizeof( x ) / sizeof( x[ 0 ] ) )

/* CT Register Offsets */
#define CT_AR_O			0x3c0	/* Index and Data write port of the attribute Registers */
#define CT_GR_O			0x3ce	/* Index port of the Graphic Controller Registers */
#define CT_SR_O			0x3c4	/* Index port of the Sequencer Controller */
#define CT_CR_O			0x3d4	/* Index port of the CRT Controller */
#define CT_XR_O			0x3d6	/* Extended Register index */
#define CT_MSR_W_O		0x3c2	/* Misc. Output Register (write only) */
#define CT_LUT_MASK_O		0x3c6	/* Color Palette Mask */
#define CT_LUT_START_O		0x3c8	/* Color Palette Write Mode Index */
#define CT_LUT_RGB_O		0x3c9	/* Color Palette Data Port */
#define CT_STATUS_REG0_O	0x3c2	/* Status Register 0 (read only) */
#define CT_STATUS_REG1_O	0x3da	/* Input Status Register 1 (read only) */

#define CT_FP_O			0x3d0	/* Index port of the Flat panel Registers */
#define CT_MR_O			0x3d2	/* Index Port of the Multimedia Extension */

/* defines for the memory mapped registers */
#define BR00_o		0x400000	/* Source and Destination Span Register */
#define BR01_o		0x400004	/* Pattern/Source Expansion Background Color & Transparency Key Register */
#define BR02_o		0x400008	/* Pattern/Source Expansion Foreground Color Register */
#define BR03_o		0x40000C	/* Monochrome Source Control Register */
#define BR04_o		0x400010	/* BitBLT Control Register */
#define BR05_o		0x400014	/* Pattern Address Registe */
#define BR06_o		0x400018	/* Source Address Register */
#define BR07_o		0x40001C	/* Destination Address Register */
#define BR08_o		0x400020	/* Destination Width & Height Register */
#define BR09_o		0x400024	/* Source Expansion Background Color & Transparency Key Register */
#define BR0A_o		0x400028	/* Source Expansion Foreground Color Register */

#define CURSOR_SIZE	0x1000	/* in KByte for HW Cursor */
#define PATTERN_ADR	(pGD->dprBase + CURSOR_SIZE)	/* pattern Memory after Cursor Memory */
#define PATTERN_SIZE	8*8*4	/* 4 Bytes per Pixel 8 x 8 Pixel */
#define ACCELMEMORY	(CURSOR_SIZE + PATTERN_SIZE)	/* reserved Memory for BITBlt and hw cursor */

/* Some Mode definitions */
#define FB_SYNC_HOR_HIGH_ACT	1	/* horizontal sync high active  */
#define FB_SYNC_VERT_HIGH_ACT	2	/* vertical sync high active    */
#define FB_SYNC_EXT		4	/* external sync                */
#define FB_SYNC_COMP_HIGH_ACT	8	/* composite sync high active   */
#define FB_SYNC_BROADCAST	16	/* broadcast video timings      */
					/* vtotal = 144d/288n/576i => PAL  */
					/* vtotal = 121d/242n/484i => NTSC */
#define FB_SYNC_ON_GREEN	32	/* sync on green */

#define FB_VMODE_NONINTERLACED  0	/* non interlaced */
#define FB_VMODE_INTERLACED	1	/* interlaced   */
#define FB_VMODE_DOUBLE		2	/* double scan */
#define FB_VMODE_MASK		255

#define FB_VMODE_YWRAP		256	/* ywrap instead of panning     */
#define FB_VMODE_SMOOTH_XPAN	512	/* smooth xpan possible (internally used) */
#define FB_VMODE_CONUPDATE	512	/* don't update x/yoffset       */

#define text			0
#define fntwidth		8

/* table for VGA Initialization  */
typedef struct {
	const unsigned char reg;
	const unsigned char val;
} CT_CFG_TABLE;

/* this table provides some basic initialisations such as Memory Clock etc */
static CT_CFG_TABLE xreg[] = {
	{0x09, 0x01},		/* CRT Controller Extensions Enable */
	{0x0A, 0x02},		/* Frame Buffer Mapping */
	{0x0B, 0x01},		/* PCI Write Burst support */
	{0x20, 0x00},		/* BitBLT Configuration */
	{0x40, 0x03},		/* Memory Access Control */
	{0x60, 0x00},		/* Video Pin Control */
	{0x61, 0x00},		/* DPMS Synch control */
	{0x62, 0x00},		/* GPIO Pin Control */
	{0x63, 0xBD},		/* GPIO Pin Data */
	{0x67, 0x00},		/* Pin Tri-State */
	{0x80, 0x80},		/* Pixel Pipeline Config 0 register */
	{0xA0, 0x00},		/* Cursor 1 Control Reg */
	{0xA1, 0x00},		/* Cursor 1 Vertical Extension Reg */
	{0xA2, 0x00},		/* Cursor 1 Base Address Low */
	{0xA3, 0x00},		/* Cursor 1 Base Address High */
	{0xA4, 0x00},		/* Cursor 1 X-Position Low */
	{0xA5, 0x00},		/* Cursor 1 X-Position High */
	{0xA6, 0x00},		/* Cursor 1 Y-Position Low */
	{0xA7, 0x00},		/* Cursor 1 Y-Position High */
	{0xA8, 0x00},		/* Cursor 2 Control Reg */
	{0xA9, 0x00},		/* Cursor 2 Vertical Extension Reg */
	{0xAA, 0x00},		/* Cursor 2 Base Address Low */
	{0xAB, 0x00},		/* Cursor 2 Base Address High */
	{0xAC, 0x00},		/* Cursor 2 X-Position Low */
	{0xAD, 0x00},		/* Cursor 2 X-Position High */
	{0xAE, 0x00},		/* Cursor 2 Y-Position Low */
	{0xAF, 0x00},		/* Cursor 2 Y-Position High */
	{0xC0, 0x7D},		/* Dot Clock 0 VCO M-Divisor */
	{0xC1, 0x07},		/* Dot Clock 0 VCO N-Divisor */
	{0xC3, 0x34},		/* Dot Clock 0 Divisor select */
	{0xC4, 0x55},		/* Dot Clock 1 VCO M-Divisor */
	{0xC5, 0x09},		/* Dot Clock 1 VCO N-Divisor */
	{0xC7, 0x24},		/* Dot Clock 1 Divisor select */
	{0xC8, 0x7D},		/* Dot Clock 2 VCO M-Divisor */
	{0xC9, 0x07},		/* Dot Clock 2 VCO N-Divisor */
	{0xCB, 0x34},		/* Dot Clock 2 Divisor select */
	{0xCC, 0x38},		/* Memory Clock 0 VCO M-Divisor */
	{0xCD, 0x03},		/* Memory Clock 0 VCO N-Divisor */
	{0xCE, 0x90},		/* Memory Clock 0 Divisor select */
	{0xCF, 0x06},		/* Clock Config */
	{0xD0, 0x0F},		/* Power Down */
	{0xD1, 0x01},		/* Power Down BitBLT */
	{0xFF, 0xFF}		/* end of table */
};
/* Clock Config:
 * =============
 *
 * PD Registers:
 * -------------
 * Bit2 and Bit4..6 are used for the Loop Divisor and Post Divisor.
 * They are encoded as follows:
 *
 * +---+--------------+
 * | 2 | Loop Divisor |
 * +---+--------------+
 * | 1 | 1            |
 * +---+--------------+
 * | 0 | 4            |
 * +---+--------------+
 * Note: The Memory Clock does not have a Loop Divisor.
 * +---+---+---+--------------+
 * | 6 | 5 | 4 | Post Divisor |
 * +---+---+---+--------------+
 * | 0 | 0 | 0 | 1            |
 * +---+---+---+--------------+
 * | 0 | 0 | 1 | 2            |
 * +---+---+---+--------------+
 * | 0 | 1 | 0 | 4            |
 * +---+---+---+--------------+
 * | 0 | 1 | 1 | 8            |
 * +---+---+---+--------------+
 * | 1 | 0 | 0 | 16           |
 * +---+---+---+--------------+
 * | 1 | 0 | 1 | 32           |
 * +---+---+---+--------------+
 * | 1 | 1 | X | reserved     |
 * +---+---+---+--------------+
 *
 * All other bits are reserved in these registers.
 *
 * Clock VCO M Registers:
 * ----------------------
 * These Registers contain the M Value -2.
 *
 * Clock VCO N Registers:
 * ----------------------
 * These Registers contain the N Value -2.
 *
 * Formulas:
 * ---------
 * Fvco = (Fref * Loop Divisor * M/N), whereas 100MHz < Fvco < 220MHz
 * Fout = Fvco / Post Divisor
 *
 * Dot Clk0 (default 25MHz):
 * -------------------------
 * Fvco = 14.318 * 127 / 9 = 202.045MHz
 * Fout = 202.045MHz / 8 = 25.25MHz
 * Post Divisor = 8
 * Loop Divisor = 1
 * XRC0 = (M - 2) = 125 = 0x7D
 * XRC1 = (N - 2) = 7   = 0x07
 * XRC3 =                 0x34
 *
 * Dot Clk1 (default 28MHz):
 * -------------------------
 * Fvco = 14.318 * 87 / 11 = 113.24MHz
 * Fout = 113.24MHz / 4 = 28.31MHz
 * Post Divisor = 4
 * Loop Divisor = 1
 * XRC4 = (M - 2) = 85 = 0x55
 * XRC5 = (N - 2) = 9  = 0x09
 * XRC7 =                0x24
 *
 * Dot Clk2 (variable for extended modes set to 25MHz):
 * ----------------------------------------------------
 * Fvco = 14.318 * 127 / 9 = 202.045MHz
 * Fout = 202.045MHz / 8 = 25.25MHz
 * Post Divisor = 8
 * Loop Divisor = 1
 * XRC8 = (M - 2) = 125 = 0x7D
 * XRC9 = (N - 2) = 7   = 0x07
 * XRCB =                 0x34
 *
 * Memory Clk for most modes >50MHz:
 * ----------------------------------
 * Fvco = 14.318 * 58 / 5 = 166MHz
 * Fout = 166MHz / 2      = 83MHz
 * Post Divisor = 2
 * XRCC = (M - 2) = 57  = 0x38
 * XRCD = (N - 2) = 3   = 0x03
 * XRCE =                 0x90
 *
 * Note Bit7 enables the clock source from the VCO
 *
 */

/******************************************************************
 * Resolution Struct
 ******************************************************************/
struct ctfb_res_modes {
	int xres;		/* visible resolution           */
	int yres;
	/* Timing: All values in pixclocks, except pixclock (of course) */
	int pixclock;		/* pixel clock in ps (pico seconds) */
	int left_margin;	/* time from sync to picture    */
	int right_margin;	/* time from picture to sync    */
	int upper_margin;	/* time from sync to picture    */
	int lower_margin;
	int hsync_len;		/* length of horizontal sync    */
	int vsync_len;		/* length of vertical sync      */
	int sync;		/* see FB_SYNC_*                */
	int vmode;		/* see FB_VMODE_*               */
};

/******************************************************************
 * Vesa Mode Struct
 ******************************************************************/
struct ctfb_vesa_modes {
	int vesanr;		/* Vesa number as in LILO (VESA Nr + 0x200} */
	int resindex;		/* index to resolution struct */
	int bits_per_pixel;	/* bpp */
};
/*******************************************************************
 * Chips struct
 *******************************************************************/
struct ctfb_chips_properties {
	int device_id;		/* PCI Device ID */
	unsigned long max_mem;	/* memory for frame buffer */
	int vld_set;		/* value of VLD if bit2 in clock control is set */
	int vld_not_set;	/* value of VLD if bit2 in clock control is set */
	int mn_diff;		/* difference between M/N Value + mn_diff = M/N Register */
	int mn_min;		/* min value of M/N Value */
	int mn_max;		/* max value of M/N Value */
	int vco_min;		/* VCO Min in MHz */
	int vco_max;		/* VCO Max in MHz */
};

static const struct ctfb_chips_properties chips[] = {
	{PCI_DEVICE_ID_CT_69000, 0x200000, 1, 4, -2, 3, 257, 100, 220},
	{PCI_DEVICE_ID_CT_65555, 0x100000, 16, 4, 0, 1, 255, 48, 220},	/* NOT TESTED */
	{0, 0, 0, 0, 0, 0, 0, 0, 0}	/* Terminator */
};

/*************************************************
 Video Modes:
Colours   640x400 640x480 800x600 1024x768 1152x864 1280x1024 1600x1200
--------+--------------------------------------------------------------
 4 bits |    ?       ?     0x302      ?        ?        ?         ?
 8 bits |  0x300   0x301   0x303    0x305    0x161    0x307     0x31C
15 bits |    ?     0x310   0x313    0x316    0x162    0x319     0x31D
16 bits |    ?     0x311   0x314    0x317    0x163    0x31A     0x31E
24 bits |    ?     0x312   0x315    0x318      ?      0x31B     0x31F
32 bits |    ?       ?       ?        ?      0x164      ?
*/

#define RES_MODE_640x480 	0
#define RES_MODE_800x600 	1
#define RES_MODE_1024x768 	2
#define RES_MODE_960_720	3
#define RES_MODE_1152x864 	4
#define RES_MODES_COUNT		5

#define VESA_MODES_COUNT 15

static const struct ctfb_vesa_modes vesa_modes[VESA_MODES_COUNT] = {
	{0x301, RES_MODE_640x480, 8},
	{0x310, RES_MODE_640x480, 15},
	{0x311, RES_MODE_640x480, 16},
	{0x312, RES_MODE_640x480, 24},
	{0x303, RES_MODE_800x600, 8},
	{0x313, RES_MODE_800x600, 15},
	{0x314, RES_MODE_800x600, 16},
	{0x315, RES_MODE_800x600, 24},
	{0x305, RES_MODE_1024x768, 8},
	{0x316, RES_MODE_1024x768, 15},
	{0x317, RES_MODE_1024x768, 16},
	{0x318, RES_MODE_1024x768, 24},
	{0x161, RES_MODE_1152x864, 8},
	{0x162, RES_MODE_1152x864, 15},
	{0x163, RES_MODE_1152x864, 16}
};

static const struct ctfb_res_modes res_mode_init[RES_MODES_COUNT] = {
	/* x     y pixclk   le  ri  up  lo   hs vs  s  vmode */
	{640, 480, 39721, 40, 24, 32, 11, 96, 2, 0,
	 FB_VMODE_NONINTERLACED},
	{800, 600, 27778, 64, 24, 22, 1, 72, 2, 0, FB_VMODE_NONINTERLACED},
	{1024, 768, 15384, 168, 8, 29, 3, 144, 4, 0,
	 FB_VMODE_NONINTERLACED},
	{960, 720, 13100, 160, 40, 32, 8, 80, 4, 0,
	 FB_VMODE_NONINTERLACED},
	{1152, 864, 12004, 200, 64, 32, 16, 80, 4, 0,
	 FB_VMODE_NONINTERLACED}
};

/*
 * The Graphic Device
 */
GraphicDevice ctfb;

/*******************************************************************************
*
* Low Level Routines
*/

/*******************************************************************************
*
* Read CT ISA register
*/
#ifdef VGA_DEBUG
static unsigned char
ctRead (unsigned short index)
{
	GraphicDevice *pGD = (GraphicDevice *) & ctfb;
	if (index == CT_AR_O)
		/* synch the Flip Flop */
		in8 (pGD->isaBase + CT_STATUS_REG1_O);

	return (in8 (pGD->isaBase + index));
}
#endif
/*******************************************************************************
*
* Write CT ISA register
*/
static void
ctWrite (unsigned short index, unsigned char val)
{
	GraphicDevice *pGD = (GraphicDevice *) & ctfb;

	out8 ((pGD->isaBase + index), val);
}

/*******************************************************************************
*
* Read CT ISA register indexed
*/
static unsigned char
ctRead_i (unsigned short index, char reg)
{
	GraphicDevice *pGD = (GraphicDevice *) & ctfb;
	if (index == CT_AR_O)
		/* synch the Flip Flop */
		in8 (pGD->isaBase + CT_STATUS_REG1_O);
	out8 ((pGD->isaBase + index), reg);
	return (in8 (pGD->isaBase + index + 1));
}

/*******************************************************************************
*
* Write CT ISA register indexed
*/
static void
ctWrite_i (unsigned short index, char reg, char val)
{
	GraphicDevice *pGD = (GraphicDevice *) & ctfb;
	if (index == CT_AR_O) {
		/* synch the Flip Flop */
		in8 (pGD->isaBase + CT_STATUS_REG1_O);
		out8 ((pGD->isaBase + index), reg);
		out8 ((pGD->isaBase + index), val);
	} else {
		out8 ((pGD->isaBase + index), reg);
		out8 ((pGD->isaBase + index + 1), val);
	}
}

/*******************************************************************************
*
* Write a table of CT ISA register
*/
static void
ctLoadRegs (unsigned short index, CT_CFG_TABLE * regTab)
{
	while (regTab->reg != 0xFF) {
		ctWrite_i (index, regTab->reg, regTab->val);
		regTab++;
	}
}

/*****************************************************************************/
static void
SetArRegs (void)
{
	int i, tmp;

	for (i = 0; i < 0x10; i++)
		ctWrite_i (CT_AR_O, i, i);
	if (text)
		tmp = 0x04;
	else
		tmp = 0x41;

	ctWrite_i (CT_AR_O, 0x10, tmp);	/* Mode Control Register */
	ctWrite_i (CT_AR_O, 0x11, 0x00);	/* Overscan Color Register */
	ctWrite_i (CT_AR_O, 0x12, 0x0f);	/* Memory Plane Enable Register */
	if (fntwidth == 9)
		tmp = 0x08;
	else
		tmp = 0x00;
	ctWrite_i (CT_AR_O, 0x13, tmp);	/* Horizontal Pixel Panning */
	ctWrite_i (CT_AR_O, 0x14, 0x00);	/* Color Select Register    */
	ctWrite (CT_AR_O, 0x20);	/* enable video             */
}

/*****************************************************************************/
static void
SetGrRegs (void)
{				/* Set Graphics Mode */
	int i;

	for (i = 0; i < 0x05; i++)
		ctWrite_i (CT_GR_O, i, 0);
	if (text) {
		ctWrite_i (CT_GR_O, 0x05, 0x10);
		ctWrite_i (CT_GR_O, 0x06, 0x02);
	} else {
		ctWrite_i (CT_GR_O, 0x05, 0x40);
		ctWrite_i (CT_GR_O, 0x06, 0x05);
	}
	ctWrite_i (CT_GR_O, 0x07, 0x0f);
	ctWrite_i (CT_GR_O, 0x08, 0xff);
}

/*****************************************************************************/
static void
SetSrRegs (void)
{
	int tmp = 0;

	ctWrite_i (CT_SR_O, 0x00, 0x00);	/* reset */
	/*rr( sr, 0x01, tmp );
	   if( fntwidth == 8 ) tmp |= 0x01; else tmp &= ~0x01;
	   wr( sr, 0x01, tmp );  */
	if (fntwidth == 8)
		ctWrite_i (CT_SR_O, 0x01, 0x01);	/* Clocking Mode Register */
	else
		ctWrite_i (CT_SR_O, 0x01, 0x00);	/* Clocking Mode Register */
	ctWrite_i (CT_SR_O, 0x02, 0x0f);	/* Enable CPU wr access to given memory plane */
	ctWrite_i (CT_SR_O, 0x03, 0x00);	/* Character Map Select Register */
	if (text)
		tmp = 0x02;
	else
		tmp = 0x0e;
	ctWrite_i (CT_SR_O, 0x04, tmp);	/* Enable CPU accesses to the rest of the 256KB
					   total VGA memory beyond the first 64KB and set
					   fb mapping mode. */
	ctWrite_i (CT_SR_O, 0x00, 0x03);	/* enable */
}

/*****************************************************************************/
static void
SetBitsPerPixelIntoXrRegs (int bpp)
{
	unsigned int n = (bpp >> 3), tmp;	/* only for 15, 8, 16, 24 bpp */
	static char md[4] = { 0x04, 0x02, 0x05, 0x06 };	/* DisplayColorMode */
	static char off[4] = { ~0x20, ~0x30, ~0x20, ~0x10 };	/* mask */
	static char on[4] = { 0x10, 0x00, 0x10, 0x20 };	/* mask */
	if (bpp == 15)
		n = 0;
	tmp = ctRead_i (CT_XR_O, 0x20);
	tmp &= off[n];
	tmp |= on[n];
	ctWrite_i (CT_XR_O, 0x20, tmp);	/* BitBLT Configuration */
	ctWrite_i (CT_XR_O, 0x81, md[n]);
}

/*****************************************************************************/
static void
SetCrRegs (struct ctfb_res_modes *var, int bits_per_pixel)
{				/* he -le-   ht|0    hd -ri- hs     -h-      he */
	unsigned char cr[0x7a];
	int i, tmp;
	unsigned int hd, hs, he, ht, hbe;	/* Horizontal.  */
	unsigned int vd, vs, ve, vt;	/* vertical */
	unsigned int bpp, wd, dblscan, interlaced, bcast, CrtHalfLine;
	unsigned int CompSyncCharClkDelay, CompSyncPixelClkDelay;
	unsigned int NTSC_PAL_HorizontalPulseWidth, BlDelayCtrl;
	unsigned int HorizontalEqualizationPulses;
	unsigned int HorizontalSerration1Start, HorizontalSerration2Start;

	const int LineCompare = 0x3ff;
	unsigned int TextScanLines = 1;	/* this is in fact a vertical zoom factor   */
	unsigned int RAMDAC_BlankPedestalEnable = 0;	/* 1=en-, 0=disable, see XR82 */

	hd = (var->xres) / 8;	/* HDisp.  */
	hs = (var->xres + var->right_margin) / 8;	/* HsStrt  */
	he = (var->xres + var->right_margin + var->hsync_len) / 8;	/* HsEnd   */
	ht = (var->left_margin + var->xres + var->right_margin + var->hsync_len) / 8;	/* HTotal  */
	hbe = ht - 1;		/* HBlankEnable todo docu wants ht here, but it does not work */
	/* ve -up-  vt|0    vd -lo- vs     -v-      ve */
	vd = var->yres;		/* VDisplay   */
	vs = var->yres + var->lower_margin;	/* VSyncStart */
	ve = var->yres + var->lower_margin + var->vsync_len;	/* VSyncEnd */
	vt = var->upper_margin + var->yres + var->lower_margin + var->vsync_len;	/* VTotal  */
	bpp = bits_per_pixel;
	dblscan = (var->vmode & FB_VMODE_DOUBLE) ? 1 : 0;
	interlaced = var->vmode & FB_VMODE_INTERLACED;
	bcast = var->sync & FB_SYNC_BROADCAST;
	CrtHalfLine = bcast ? (hd >> 1) : 0;
	BlDelayCtrl = bcast ? 1 : 0;
	CompSyncCharClkDelay = 0;	/* 2 bit */
	CompSyncPixelClkDelay = 0;	/* 3 bit */
	if (bcast) {
		NTSC_PAL_HorizontalPulseWidth = 7;	/*( var->hsync_len >> 1 ) + 1 */
		HorizontalEqualizationPulses = 0;	/* inverse value */
		HorizontalSerration1Start = 31;	/* ( ht >> 1 ) */
		HorizontalSerration2Start = 89;	/* ( ht >> 1 ) */
	} else {
		NTSC_PAL_HorizontalPulseWidth = 0;
		/* 4 bit: hsync pulse width = ( ( CR74[4:0] - CR74[5] )
		 * / 2 ) + 1 --> CR74[4:0] = 2*(hs-1) + CR74[5] */
		HorizontalEqualizationPulses = 1;	/* inverse value */
		HorizontalSerration1Start = 0;	/* ( ht >> 1 ) */
		HorizontalSerration2Start = 0;	/* ( ht >> 1 ) */
	}

	if (bpp == 15)
		bpp = 16;
	wd = var->xres * bpp / 64;	/* double words per line */
	if (interlaced) {	/* we divide all vertical timings, exept vd */
		vs >>= 1;
		ve >>= 1;
		vt >>= 1;
	}
	memset (cr, 0, sizeof (cr));
	cr[0x00] = 0xff & (ht - 5);
	cr[0x01] = hd - 1;	/* soll:4f ist 59 */
	cr[0x02] = hd;
	cr[0x03] = (hbe & 0x1F) | 0x80;	/* hd + ht - hd  */
	cr[0x04] = hs;
	cr[0x05] = ((hbe & 0x20) << 2) | (he & 0x1f);
	cr[0x06] = (vt - 2) & 0xFF;
	cr[0x30] = (vt - 2) >> 8;
	cr[0x07] = ((vt & 0x100) >> 8)
	    | ((vd & 0x100) >> 7)
	    | ((vs & 0x100) >> 6)
	    | ((vs & 0x100) >> 5)
	    | ((LineCompare & 0x100) >> 4)
	    | ((vt & 0x200) >> 4)
	    | ((vd & 0x200) >> 3)
	    | ((vs & 0x200) >> 2);
	cr[0x08] = 0x00;
	cr[0x09] = (dblscan << 7)
	    | ((LineCompare & 0x200) >> 3)
	    | ((vs & 0x200) >> 4)
	    | (TextScanLines - 1);
	cr[0x10] = vs & 0xff;	/* VSyncPulseStart */
	cr[0x32] = (vs & 0xf00) >> 8;	/* VSyncPulseStart */
	cr[0x11] = (ve & 0x0f);	/* | 0x20;      */
	cr[0x12] = (vd - 1) & 0xff;	/* LineCount  */
	cr[0x31] = ((vd - 1) & 0xf00) >> 8;	/* LineCount */
	cr[0x13] = wd & 0xff;
	cr[0x41] = (wd & 0xf00) >> 8;
	cr[0x15] = vs & 0xff;
	cr[0x33] = (vs & 0xf00) >> 8;
	cr[0x38] = (0x100 & (ht - 5)) >> 8;
	cr[0x3C] = 0xc0 & hbe;
	cr[0x16] = (vt - 1) & 0xff;	/* vbe - docu wants vt here, */
	cr[0x17] = 0xe3;	/* but it does not work */
	cr[0x18] = 0xff & LineCompare;
	cr[0x22] = 0xff;	/* todo? */
	cr[0x70] = interlaced ? (0x80 | CrtHalfLine) : 0x00;	/* check:0xa6  */
	cr[0x71] = 0x80 | (RAMDAC_BlankPedestalEnable << 6)
	    | (BlDelayCtrl << 5)
	    | ((0x03 & CompSyncCharClkDelay) << 3)
	    | (0x07 & CompSyncPixelClkDelay);	/* todo: see XR82 */
	cr[0x72] = HorizontalSerration1Start;
	cr[0x73] = HorizontalSerration2Start;
	cr[0x74] = (HorizontalEqualizationPulses << 5)
	    | NTSC_PAL_HorizontalPulseWidth;
	/* todo: ct69000 has also 0x75-79 */
	/* now set the registers */
	for (i = 0; i <= 0x0d; i++) {	/*CR00 .. CR0D */
		ctWrite_i (CT_CR_O, i, cr[i]);
	}
	for (i = 0x10; i <= 0x18; i++) {	/*CR10 .. CR18 */
		ctWrite_i (CT_CR_O, i, cr[i]);
	}
	i = 0x22;		/*CR22 */
	ctWrite_i (CT_CR_O, i, cr[i]);
	for (i = 0x30; i <= 0x33; i++) {	/*CR30 .. CR33 */
		ctWrite_i (CT_CR_O, i, cr[i]);
	}
	i = 0x38;		/*CR38 */
	ctWrite_i (CT_CR_O, i, cr[i]);
	i = 0x3C;		/*CR3C */
	ctWrite_i (CT_CR_O, i, cr[i]);
	for (i = 0x40; i <= 0x41; i++) {	/*CR40 .. CR41 */
		ctWrite_i (CT_CR_O, i, cr[i]);
	}
	for (i = 0x70; i <= 0x74; i++) {	/*CR70 .. CR74 */
		ctWrite_i (CT_CR_O, i, cr[i]);
	}
	tmp = ctRead_i (CT_CR_O, 0x40);
	tmp &= 0x0f;
	tmp |= 0x80;
	ctWrite_i (CT_CR_O, 0x40, tmp);	/* StartAddressEnable */
}

/* pixelclock control */

/*****************************************************************************
 We have a rational number p/q and need an m/n which is very close to p/q
 but has m and n within mnmin and mnmax. We have no floating point in the
 kernel. We can use long long without divide. And we have time to compute...
******************************************************************************/
static unsigned int
FindBestPQFittingMN (unsigned int p, unsigned int q, unsigned int mnmin,
		     unsigned int mnmax, unsigned int *pm, unsigned int *pn)
{
	/* this code is not for general purpose usable but good for our number ranges */
	unsigned int n = mnmin, m = 0;
	long long int L = 0, P = p, Q = q, H = P >> 1;
	long long int D = 0x7ffffffffffffffLL;
	for (n = mnmin; n <= mnmax; n++) {
		m = mnmin;	/* p/q ~ m/n -> p*n ~ m*q -> p*n-x*q ~ 0 */
		L = P * n - m * Q;	/* n * vco - m * fref should be near 0 */
		while (L > 0 && m < mnmax) {
			L -= q;	/* difference is greater as 0 subtract fref */
			m++;	/* and increment m */
		}
		/* difference is less or equal than 0 or m > maximum */
		if (m > mnmax)
			break;	/* no solution: if we increase n we get the same situation */
		/* L is <= 0 now */
		if (-L > H && m > mnmin) {	/* if difference > the half fref */
			L += q;	/* we take the situation before */
			m--;	/* because its closer to 0 */
		}
		L = (L < 0) ? -L : +L;	/* absolute value */
		if (D < L)	/* if last difference was better take next n */
			continue;
		D = L;
		*pm = m;
		*pn = n;	/*  keep improved data */
		if (D == 0)
			break;	/* best result we can get */
	}
	return (unsigned int) (0xffffffff & D);
}

/* that is the hardware < 69000 we have to manage
 +---------+  +-------------------+  +----------------------+  +--+
 | REFCLK  |__|NTSC Divisor Select|__|FVCO Reference Divisor|__|÷N|__
 | 14.3MHz |  |(NTSCDS) (÷1, ÷5)  |  |Select (RDS) (÷1, ÷4) |  |  |  |
 +---------+  +-------------------+  +----------------------+  +--+  |
  ___________________________________________________________________|
 |
 |                                    fvco                      fout
 | +--------+  +------------+  +-----+     +-------------------+   +----+
 +-| Phase  |__|Charge Pump |__| VCO |_____|Post Divisor (PD)  |___|CLK |--->
 +-| Detect |  |& Filter VCO|  |     |  |  |÷1, 2, 4, 8, 16, 32|   |    |
 | +--------+  +------------+  +-----+  |  +-------------------+   +----+
 |                                      |
 |    +--+   +---------------+          |
 |____|÷M|___|VCO Loop Divide|__________|
      |  |   |(VLD)(÷4, ÷16) |
      +--+   +---------------+
****************************************************************************
  that is the hardware >= 69000 we have to manage
 +---------+  +--+
 | REFCLK  |__|÷N|__
 | 14.3MHz |  |  |  |
 +---------+  +--+  |
  __________________|
 |
 |                                    fvco                      fout
 | +--------+  +------------+  +-----+     +-------------------+   +----+
 +-| Phase  |__|Charge Pump |__| VCO |_____|Post Divisor (PD)  |___|CLK |--->
 +-| Detect |  |& Filter VCO|  |     |  |  |÷1, 2, 4, 8, 16, 32|   |    |
 | +--------+  +------------+  +-----+  |  +-------------------+   +----+
 |                                      |
 |    +--+   +---------------+          |
 |____|÷M|___|VCO Loop Divide|__________|
      |  |   |(VLD)(÷1, ÷4)  |
      +--+   +---------------+


*/

#define VIDEO_FREF 14318180;	/* Hz  */
/*****************************************************************************/
static int
ReadPixClckFromXrRegsBack (struct ctfb_chips_properties *param)
{
	unsigned int m, n, vld, pd, PD, fref, xr_cb, i, pixclock;
	i = 0;
	pixclock = -1;
	fref = VIDEO_FREF;
	m = ctRead_i (CT_XR_O, 0xc8);
	n = ctRead_i (CT_XR_O, 0xc9);
	m -= param->mn_diff;
	n -= param->mn_diff;
	xr_cb = ctRead_i (CT_XR_O, 0xcb);
	PD = (0x70 & xr_cb) >> 4;
	pd = 1;
	for (i = 0; i < PD; i++) {
		pd *= 2;
	}
	vld = (0x04 & xr_cb) ? param->vld_set : param->vld_not_set;
	if (n * vld * m) {
		unsigned long long p = 1000000000000LL * pd * n;
		unsigned long long q = (long long) fref * vld * m;
		while ((p > 0xffffffffLL) || (q > 0xffffffffLL)) {
			p >>= 1;	/* can't divide with long long so we scale down */
			q >>= 1;
		}
		pixclock = (unsigned) p / (unsigned) q;
	} else
		printf ("Invalid data in xr regs.\n");
	return pixclock;
}

/*****************************************************************************/
static void
FindAndSetPllParamIntoXrRegs (unsigned int pixelclock,
			      struct ctfb_chips_properties *param)
{
	unsigned int m, n, vld, pd, PD, fref, xr_cb;
	unsigned int fvcomin, fvcomax, pclckmin, pclckmax, pclk;
	unsigned int pfreq, fvco, new_pixclock;
	unsigned int D,nback,mback;

	fref = VIDEO_FREF;
	pd = 1;
	PD = 0;
	fvcomin = param->vco_min;
	fvcomax = param->vco_max;	/* MHz */
	pclckmin = 1000000 / fvcomax + 1;	/*   4546 */
	pclckmax = 32000000 / fvcomin - 1;	/* 666665 */
	pclk = minmax (pclckmin, pixelclock, pclckmax);	/* ps pp */
	pfreq = 250 * (4000000000U / pclk);
	fvco = pfreq;		/* Hz */
	new_pixclock = 0;
	while (fvco < fvcomin * 1000000) {
		/* double VCO starting with the pixelclock frequency
		 * as long as it is lower than the minimal VCO frequency */
		fvco *= 2;
		pd *= 2;
		PD++;
	}
	/* fvco is exactly pd * pixelclock and higher than the ninmal VCO frequency */
	/* first try */
	vld = param->vld_set;
	D=FindBestPQFittingMN (fvco / vld, fref, param->mn_min, param->mn_max, &m, &n); /* rds = 1 */
	mback=m;
	nback=n;
	/* second try */
	vld = param->vld_not_set;
	if(D<FindBestPQFittingMN (fvco / vld, fref, param->mn_min, param->mn_max, &m, &n)) {    /* rds = 1 */
		/* first try was better */
		m=mback;
		n=nback;
		vld = param->vld_set;
	}
	m += param->mn_diff;
	n += param->mn_diff;
	PRINTF ("VCO %d, pd %d, m %d n %d vld %d \n", fvco, pd, m, n, vld);
	xr_cb = ((0x7 & PD) << 4) | (vld == param->vld_set ? 0x04 : 0);
	/* All four of the registers used for dot clock 2 (XRC8 - XRCB) must be
	 * written, and in order from XRC8 to XRCB, before the hardware will
	 * update the synthesizer s settings.
	 */
	ctWrite_i (CT_XR_O, 0xc8, m);
	ctWrite_i (CT_XR_O, 0xc9, n);	/* xrca does not exist in CT69000 and CT69030 */
	ctWrite_i (CT_XR_O, 0xca, 0);	/* because of a hw bug I guess, but we write */
	ctWrite_i (CT_XR_O, 0xcb, xr_cb);	/* 0 to it for savety */
	new_pixclock = ReadPixClckFromXrRegsBack (param);
	PRINTF ("pixelclock.set = %d, pixelclock.real = %d \n",
		pixelclock, new_pixclock);
}

/*****************************************************************************/
static void
SetMsrRegs (struct ctfb_res_modes *mode)
{
	unsigned char h_synch_high, v_synch_high;

	h_synch_high = (mode->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 0x40;	/* horizontal Synch High active */
	v_synch_high = (mode->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 0x80;	/* vertical Synch High active */
	ctWrite (CT_MSR_W_O, (h_synch_high | v_synch_high | 0x29));
	/* upper64K==0x20, CLC2select==0x08, RAMenable==0x02!(todo), CGA==0x01
	 * Selects the upper 64KB page.Bit5=1
	 * CLK2 (left reserved in standard VGA) Bit3|2=1|0
	 * Disables CPU access to frame buffer. Bit1=0
	 * Sets the I/O address decode for ST01, FCR, and all CR registers
	 * to the 3Dx I/O address range (CGA emulation). Bit0=1
	 */
}

/************************************************************************************/
#ifdef VGA_DUMP_REG

static void
ctDispRegs (unsigned short index, int from, int to)
{
	unsigned char status;
	int i;

	for (i = from; i < to; i++) {
		status = ctRead_i (index, i);
		printf ("%02X: is %02X\n", i, status);
	}
}

void
video_dump_reg (void)
{
	int i;

	printf ("Extended Regs:\n");
	ctDispRegs (CT_XR_O, 0, 0xC);
	ctDispRegs (CT_XR_O, 0xe, 0xf);
	ctDispRegs (CT_XR_O, 0x20, 0x21);
	ctDispRegs (CT_XR_O, 0x40, 0x50);
	ctDispRegs (CT_XR_O, 0x60, 0x64);
	ctDispRegs (CT_XR_O, 0x67, 0x68);
	ctDispRegs (CT_XR_O, 0x70, 0x72);
	ctDispRegs (CT_XR_O, 0x80, 0x83);
	ctDispRegs (CT_XR_O, 0xA0, 0xB0);
	ctDispRegs (CT_XR_O, 0xC0, 0xD3);
	printf ("Sequencer Regs:\n");
	ctDispRegs (CT_SR_O, 0, 0x8);
	printf ("Graphic Regs:\n");
	ctDispRegs (CT_GR_O, 0, 0x9);
	printf ("CRT Regs:\n");
	ctDispRegs (CT_CR_O, 0, 0x19);
	ctDispRegs (CT_CR_O, 0x22, 0x23);
	ctDispRegs (CT_CR_O, 0x30, 0x34);
	ctDispRegs (CT_CR_O, 0x38, 0x39);
	ctDispRegs (CT_CR_O, 0x3C, 0x3D);
	ctDispRegs (CT_CR_O, 0x40, 0x42);
	ctDispRegs (CT_CR_O, 0x70, 0x80);
	/* don't display the attributes */
}

#endif

#ifdef CONFIG_VIDEO_HW_CURSOR
/***************************************************************
 * Set Hardware Cursor in Pixel
 */
void
video_set_hw_cursor (int x, int y)
{
	int sig_x = 0, sig_y = 0;
	if (x < 0) {
		x *= -1;
		sig_x = 1;
	}
	if (y < 0) {
		y *= -1;
		sig_y = 1;
	}
	ctWrite_i (CT_XR_O, 0xa4, x & 0xff);
	ctWrite_i (CT_XR_O, 0xa5, (x >> 8) & 0x7);
	ctWrite_i (CT_XR_O, 0xa6, y & 0xff);
	ctWrite_i (CT_XR_O, 0xa7, (y >> 8) & 0x7);
}

/***************************************************************
 * Init Hardware Cursor. To know the size of the Cursor,
 * we have to know the Font size.
 */
void
video_init_hw_cursor (int font_width, int font_height)
{
	unsigned char xr_80;
	unsigned long *curs, pattern;
	int i;
	int cursor_start;
	GraphicDevice *pGD = (GraphicDevice *) & ctfb;

	cursor_start = pGD->dprBase;
	xr_80 = ctRead_i (CT_XR_O, 0x80);
	/* set start address */
	ctWrite_i (CT_XR_O, 0xa2, (cursor_start >> 8) & 0xf0);
	ctWrite_i (CT_XR_O, 0xa3, (cursor_start >> 16) & 0x3f);
	/* set cursor shape */
	curs = (unsigned long *) cursor_start;
	i = 0;
	while (i < 0x400) {
		curs[i++] = 0xffffffff;	/* AND mask */
		curs[i++] = 0xffffffff;	/* AND mask */
		curs[i++] = 0;	/* XOR mask */
		curs[i++] = 0;	/* XOR mask */
		/* Transparent */
	}
	pattern = 0xffffffff >> font_width;
	i = 0;
	while (i < (font_height * 2)) {
		curs[i++] = pattern;	/* AND mask */
		curs[i++] = pattern;	/* AND mask */
		curs[i++] = 0;	/* XOR mask */
		curs[i++] = 0;	/* XOR mask */
		/* Cursor Color 0 */
	}
	/* set blink rate */
	ctWrite_i (CT_FP_O, 0x19, 0xf);

	/* set cursors colors */
	xr_80 = ctRead_i (CT_XR_O, 0x80);
	xr_80 |= 0x1;		/* alternate palette select */
	ctWrite_i (CT_XR_O, 0x80, xr_80);
	video_set_lut (4, CONSOLE_FG_COL, CONSOLE_FG_COL, CONSOLE_FG_COL);
	/* position 4 is color 0 cursor 0 */
	xr_80 &= 0xfe;		/* normal palette select */
	ctWrite_i (CT_XR_O, 0x80, xr_80);
	/* cursor enable */
	ctWrite_i (CT_XR_O, 0xa0, 0x91);
	xr_80 |= 0x10;		/* enable hwcursor */
	ctWrite_i (CT_XR_O, 0x80, xr_80);
	video_set_hw_cursor (0, 0);
}
#endif				/* CONFIG_VIDEO_HW_CURSOR */

/***************************************************************
 * Wait for BitBlt ready
 */
static int
video_wait_bitblt (unsigned long addr)
{
	unsigned long br04;
	int i = 0;
	br04 = in32r (addr);
	while (br04 & 0x80000000) {
		udelay (1);
		br04 = in32r (addr);
		if (i++ > 1000000) {
			printf ("ERROR Timeout %lx\n", br04);
			return 1;
		}
	}
	return 0;
}

/***************************************************************
 * Set up BitBlt Registrs
 */
static void
SetDrawingEngine (int bits_per_pixel)
{
	unsigned long br04, br00;
	unsigned char tmp;

	GraphicDevice *pGD = (GraphicDevice *) & ctfb;

	tmp = ctRead_i (CT_XR_O, 0x20);	/* BitBLT Configuration */
	tmp |= 0x02;		/* reset BitBLT */
	ctWrite_i (CT_XR_O, 0x20, tmp);	/* BitBLT Configuration */
	udelay (10);
	tmp &= 0xfd;		/* release reset BitBLT */
	ctWrite_i (CT_XR_O, 0x20, tmp);	/* BitBLT Configuration */
	video_wait_bitblt (pGD->pciBase + BR04_o);

	/* set pattern Address */
	out32r (pGD->pciBase + BR05_o, PATTERN_ADR & 0x003ffff8);
	br04 = 0;
	if (bits_per_pixel == 1) {
		br04 |= 0x00040000;	/* monochome Pattern */
		br04 |= 0x00001000;	/* monochome source */
	}
	br00 = ((pGD->winSizeX * pGD->gdfBytesPP) << 16) + (pGD->winSizeX * pGD->gdfBytesPP);	/* bytes per scanline */
	out32r (pGD->pciBase + BR00_o, br00);	/* */
	out32r (pGD->pciBase + BR08_o, (10 << 16) + 10);	/* dummy */
	out32r (pGD->pciBase + BR04_o, br04);	/* write all 0 */
	out32r (pGD->pciBase + BR07_o, 0);	/* destination */
	video_wait_bitblt (pGD->pciBase + BR04_o);
}

/************************************************************************
 * Get Parameters for the video mode:
 */
/*********************************************************************
 * returns the length to the next seperator
 */
static int
video_get_param_len (char *start, char sep)
{
	int i = 0;
	while ((*start != 0) && (*start != sep)) {
		start++;
		i++;
	}
	return i;
}

static int
video_search_param (char *start, char *param)
{
	int len, totallen, i;
	char *p = start;
	len = strlen (param);
	totallen = len + strlen (start);
	for (i = 0; i < totallen; i++) {
		if (strncmp (p++, param, len) == 0)
			return (i);
	}
	return -1;
}

/***************************************************************
* Get parameter via the environment as it is done for the
* linux kernel i.e:
* video=ctfb:x:800,xv:1280,y:600,yv:1024,depth:16,mode:0,pclk:25000,
*       le:56,ri:48,up:26,lo:5,hs:152,vs:2,sync:0,vmode:0,accel:0
*
* penv is a pointer to the environment, containing the string, or the name of
* another environment variable. It could even be the term "bootargs"
*/

#define GET_OPTION(name,var) 				\
		if(strncmp(p,name,strlen(name))==0) { 	\
			val_s=p+strlen(name); 		\
			var=simple_strtoul(val_s, NULL, 10); \
		}

static int
video_get_params (struct ctfb_res_modes *pPar, char *penv)
{
	char *p, *s, *val_s;
	int i = 0, t;
	int bpp;
	int mode;
	/* first search for the environment containing the real param string */
	s = penv;
	if ((p = getenv (s)) != NULL) {
		s = p;
	}
	/* in case of the bootargs line, we have to start
	 * after "video=ctfb:"
	 */
	i = video_search_param (s, "video=ctfb:");
	if (i >= 0) {
		s += i;
		s += strlen ("video=ctfb:");
	}
	/* search for mode as a default value */
	p = s;
	t = 0;
	mode = 0;		/* default */
	while ((i = video_get_param_len (p, ',')) != 0) {
		GET_OPTION ("mode:", mode)
		    p += i;
		if (*p != 0)
			p++;	/* skip ',' */
	}
	if (mode >= RES_MODES_COUNT)
		mode = 0;
	*pPar = res_mode_init[mode];	/* copy default values */
	bpp = 24 - ((mode % 3) * 8);
	p = s;			/* restart */
	while ((i = video_get_param_len (p, ',')) != 0) {
		GET_OPTION ("x:", pPar->xres)
		    GET_OPTION ("y:", pPar->yres)
		    GET_OPTION ("le:", pPar->left_margin)
		    GET_OPTION ("ri:", pPar->right_margin)
		    GET_OPTION ("up:", pPar->upper_margin)
		    GET_OPTION ("lo:", pPar->lower_margin)
		    GET_OPTION ("hs:", pPar->hsync_len)
		    GET_OPTION ("vs:", pPar->vsync_len)
		    GET_OPTION ("sync:", pPar->sync)
		    GET_OPTION ("vmode:", pPar->vmode)
		    GET_OPTION ("pclk:", pPar->pixclock)
		    GET_OPTION ("depth:", bpp)
		    p += i;
		if (*p != 0)
			p++;	/* skip ',' */
	}
	return bpp;
}

/****************************************************************************
* supported Video Chips
*/
static struct pci_device_id supported[] = {
	{PCI_VENDOR_ID_CT, PCI_DEVICE_ID_CT_69000},
	{}
};

/*******************************************************************************
*
* Init video chip
*/
void *
video_hw_init (void)
{
	GraphicDevice *pGD = (GraphicDevice *) & ctfb;
	unsigned short device_id;
	pci_dev_t devbusfn;
	int videomode;
	unsigned long t1, hsynch, vsynch;
	unsigned int pci_mem_base, *vm;
	int tmp, i, bits_per_pixel;
	char *penv;
	struct ctfb_res_modes *res_mode;
	struct ctfb_res_modes var_mode;
	struct ctfb_chips_properties *chips_param;
	/* Search for video chip */

	if ((devbusfn = pci_find_devices (supported, 0)) < 0) {
#ifdef CONFIG_VIDEO_ONBOARD
		printf ("Video: Controller not found !\n");
#endif
		return (NULL);
	}

	/* PCI setup */
	pci_write_config_dword (devbusfn, PCI_COMMAND,
				(PCI_COMMAND_MEMORY | PCI_COMMAND_IO));
	pci_read_config_word (devbusfn, PCI_DEVICE_ID, &device_id);
	pci_read_config_dword (devbusfn, PCI_BASE_ADDRESS_0, &pci_mem_base);
	pci_mem_base = pci_mem_to_phys (devbusfn, pci_mem_base);

	/* get chips params */
	for (chips_param = (struct ctfb_chips_properties *) &chips[0];
	     chips_param->device_id != 0; chips_param++) {
		if (chips_param->device_id == device_id)
			break;
	}
	if (chips_param->device_id == 0) {
#ifdef CONFIG_VIDEO_ONBOARD
		printf ("Video: controller 0x%X not supported\n", device_id);
#endif
		return NULL;
	}
	/* supported Video controller found */
	printf ("Video: ");

	tmp = 0;
	videomode = 0x301;
	/* get video mode via environment */
	if ((penv = getenv ("videomode")) != NULL) {
		/* deceide if it is a string */
		if (penv[0] <= '9') {
			videomode = (int) simple_strtoul (penv, NULL, 16);
			tmp = 1;
		}
	} else {
		tmp = 1;
	}
	if (tmp) {
		/* parameter are vesa modes */
		/* search params */
		for (i = 0; i < VESA_MODES_COUNT; i++) {
			if (vesa_modes[i].vesanr == videomode)
				break;
		}
		if (i == VESA_MODES_COUNT) {
			printf ("no VESA Mode found, switching to mode 0x301 ");
			i = 0;
		}
		res_mode =
		    (struct ctfb_res_modes *) &res_mode_init[vesa_modes[i].
							     resindex];
		bits_per_pixel = vesa_modes[i].bits_per_pixel;
	} else {

		res_mode = (struct ctfb_res_modes *) &var_mode;
		bits_per_pixel = video_get_params (res_mode, penv);
	}

	/* calculate available color depth for controller memory */
	if (bits_per_pixel == 15)
		tmp = 2;
	else
		tmp = bits_per_pixel >> 3;	/* /8 */
	if (((chips_param->max_mem -
	      ACCELMEMORY) / (res_mode->xres * res_mode->yres)) < tmp) {
		tmp =
		    ((chips_param->max_mem -
		      ACCELMEMORY) / (res_mode->xres * res_mode->yres));
		if (tmp == 0) {
			printf
			    ("No matching videomode found .-> reduce resolution\n");
			return NULL;
		} else {
			printf ("Switching back to %d Bits per Pixel ",
				tmp << 3);
			bits_per_pixel = tmp << 3;
		}
	}

	/* calculate hsynch and vsynch freq (info only) */
	t1 = (res_mode->left_margin + res_mode->xres +
	      res_mode->right_margin + res_mode->hsync_len) / 8;
	t1 *= 8;
	t1 *= res_mode->pixclock;
	t1 /= 1000;
	hsynch = 1000000000L / t1;
	t1 *=
	    (res_mode->upper_margin + res_mode->yres +
	     res_mode->lower_margin + res_mode->vsync_len);
	t1 /= 1000;
	vsynch = 1000000000L / t1;

	/* fill in Graphic device struct */
	sprintf (pGD->modeIdent, "%dx%dx%d %ldkHz %ldHz", res_mode->xres,
		 res_mode->yres, bits_per_pixel, (hsynch / 1000),
		 (vsynch / 1000));
	printf ("%s\n", pGD->modeIdent);
	pGD->winSizeX = res_mode->xres;
	pGD->winSizeY = res_mode->yres;
	pGD->plnSizeX = res_mode->xres;
	pGD->plnSizeY = res_mode->yres;
	switch (bits_per_pixel) {
	case 8:
		pGD->gdfBytesPP = 1;
		pGD->gdfIndex = GDF__8BIT_INDEX;
		break;
	case 15:
		pGD->gdfBytesPP = 2;
		pGD->gdfIndex = GDF_15BIT_555RGB;
		break;
	case 16:
		pGD->gdfBytesPP = 2;
		pGD->gdfIndex = GDF_16BIT_565RGB;
		break;
	case 24:
		pGD->gdfBytesPP = 3;
		pGD->gdfIndex = GDF_24BIT_888RGB;
		break;
	}
	pGD->isaBase = CFG_ISA_IO_BASE_ADDRESS;
	pGD->pciBase = pci_mem_base;
	pGD->frameAdrs = pci_mem_base;
	pGD->memSize = chips_param->max_mem;
	/* Cursor Start Address */
	pGD->dprBase =
	    (pGD->winSizeX * pGD->winSizeY * pGD->gdfBytesPP) + pci_mem_base;
	if ((pGD->dprBase & 0x0fff) != 0) {
		/* allign it */
		pGD->dprBase &= 0xfffff000;
		pGD->dprBase += 0x00001000;
	}
	PRINTF ("Cursor Start %x Pattern Start %x\n", pGD->dprBase,
		PATTERN_ADR);
	pGD->vprBase = pci_mem_base;	/* Dummy */
	pGD->cprBase = pci_mem_base;	/* Dummy */
	/* set up Hardware */

	ctWrite (CT_MSR_W_O, 0x01);

	/* set the extended Registers */
	ctLoadRegs (CT_XR_O, xreg);
	/* set atribute registers */
	SetArRegs ();
	/* set Graphics register */
	SetGrRegs ();
	/* set sequencer */
	SetSrRegs ();

	/* set msr */
	SetMsrRegs (res_mode);

	/* set CRT Registers */
	SetCrRegs (res_mode, bits_per_pixel);
	/* set color mode */
	SetBitsPerPixelIntoXrRegs (bits_per_pixel);

	/* set PLL */
	FindAndSetPllParamIntoXrRegs (res_mode->pixclock, chips_param);

	ctWrite_i (CT_SR_O, 0, 0x03);	/* clear synchronous reset */
	/* Clear video memory */
	i = pGD->memSize / 4;
	vm = (unsigned int *) pGD->pciBase;
	while (i--)
		*vm++ = 0;
	SetDrawingEngine (bits_per_pixel);
#ifdef VGA_DUMP_REG
	video_dump_reg ();
#endif

	return ((void *) &ctfb);
}

 /*******************************************************************************
*
* Set a RGB color in the LUT (8 bit index)
*/
void
video_set_lut (unsigned int index,	/* color number */
	       unsigned char r,	/* red */
	       unsigned char g,	/* green */
	       unsigned char b	/* blue */
    )
{

	ctWrite (CT_LUT_MASK_O, 0xff);

	ctWrite (CT_LUT_START_O, (char) index);

	ctWrite (CT_LUT_RGB_O, r);	/* red */
	ctWrite (CT_LUT_RGB_O, g);	/* green */
	ctWrite (CT_LUT_RGB_O, b);	/* blue */
	udelay (1);
	ctWrite (CT_LUT_MASK_O, 0xff);
}

/*******************************************************************************
*
* Drawing engine fill on screen region
*/
void
video_hw_rectfill (unsigned int bpp,	/* bytes per pixel */
		   unsigned int dst_x,	/* dest pos x */
		   unsigned int dst_y,	/* dest pos y */
		   unsigned int dim_x,	/* frame width */
		   unsigned int dim_y,	/* frame height */
		   unsigned int color	/* fill color */
    )
{
	GraphicDevice *pGD = (GraphicDevice *) & ctfb;
	unsigned long *p, br04;

	video_wait_bitblt (pGD->pciBase + BR04_o);

	p = (unsigned long *) PATTERN_ADR;
	dim_x *= bpp;
	if (bpp == 3)
		bpp++;		/* 24Bit needs a 32bit pattern */
	memset (p, color, (bpp * sizeof (unsigned char) * 8 * 8));	/* 8 x 8 pattern data */
	out32r (pGD->pciBase + BR07_o, ((pGD->winSizeX * dst_y) + dst_x) * pGD->gdfBytesPP);	/* destination */
	br04 = in32r (pGD->pciBase + BR04_o) & 0xffffff00;
	br04 |= 0xF0;		/* write Pattern P -> D */
	out32r (pGD->pciBase + BR04_o, br04);	/* */
	out32r (pGD->pciBase + BR08_o, (dim_y << 16) + dim_x);	/* starts the BITBlt */
	video_wait_bitblt (pGD->pciBase + BR04_o);
}

/*******************************************************************************
*
* Drawing engine bitblt with screen region
*/
void
video_hw_bitblt (unsigned int bpp,	/* bytes per pixel */
		 unsigned int src_x,	/* source pos x */
		 unsigned int src_y,	/* source pos y */
		 unsigned int dst_x,	/* dest pos x */
		 unsigned int dst_y,	/* dest pos y */
		 unsigned int dim_x,	/* frame width */
		 unsigned int dim_y	/* frame height */
    )
{
	GraphicDevice *pGD = (GraphicDevice *) & ctfb;
	unsigned long br04;

	br04 = in32r (pGD->pciBase + BR04_o);

	/* to prevent data corruption due to overlap, we have to
	 * find out if, and how the frames overlaps */
	if (src_x < dst_x) {
		/* src is more left than dest
		 * the frame may overlap -> start from right to left */
		br04 |= 0x00000100;	/* set bit 8 */
		src_x += dim_x;
		dst_x += dim_x;
	} else {
		br04 &= 0xfffffeff;	/* clear bit 8 left to right */
	}
	if (src_y < dst_y) {
		/* src is higher than dst
		 * the frame may overlap => start from bottom */
		br04 |= 0x00000200;	/* set bit 9 */
		src_y += dim_y;
		dst_y += dim_y;
	} else {
		br04 &= 0xfffffdff;	/* clear bit 9 top to bottom */
	}
	dim_x *= bpp;
	out32r (pGD->pciBase + BR06_o, ((pGD->winSizeX * src_y) + src_x) * pGD->gdfBytesPP);	/* source */
	out32r (pGD->pciBase + BR07_o, ((pGD->winSizeX * dst_y) + dst_x) * pGD->gdfBytesPP);	/* destination */
	br04 &= 0xffffff00;
	br04 |= 0x000000CC;	/* S -> D */
	out32r (pGD->pciBase + BR04_o, br04);	/* */
	out32r (pGD->pciBase + BR08_o, (dim_y << 16) + dim_x);	/* start the BITBlt */
	video_wait_bitblt (pGD->pciBase + BR04_o);
}

#endif				/* CONFIG_CT69000 */

#endif				/* CONFIG_VIDEO */