tv_fs450.c   [plain text]

/* $XFree86: xc/programs/Xserver/hw/xfree86/drivers/nsc/gfx/tv_fs450.c,v 1.1 2002/12/10 15:12:27 alanh Exp $ */
/*
 * $Workfile: tv_fs450.c $
 *
 * This file contains routines to control the FS450 tvout encoder.
 *
 * NSC_LIC_ALTERNATIVE_PREAMBLE
 *
 * Revision 1.0
 *
 * National Semiconductor Alternative GPL-BSD License
 *
 * National Semiconductor Corporation licenses this software 
 * ("Software"):
 *
 *      Durango
 *
 * under one of the two following licenses, depending on how the 
 * Software is received by the Licensee.
 * 
 * If this Software is received as part of the Linux Framebuffer or
 * other GPL licensed software, then the GPL license designated 
 * NSC_LIC_GPL applies to this Software; in all other circumstances 
 * then the BSD-style license designated NSC_LIC_BSD shall apply.
 *
 * END_NSC_LIC_ALTERNATIVE_PREAMBLE */

/* NSC_LIC_BSD
 *
 * National Semiconductor Corporation Open Source License for Durango
 *
 * (BSD License with Export Notice)
 *
 * Copyright (c) 1999-2001
 * National Semiconductor Corporation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 *   * Redistributions of source code must retain the above copyright 
 *     notice, this list of conditions and the following disclaimer. 
 *
 *   * Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the following 
 *     disclaimer in the documentation and/or other materials provided 
 *     with the distribution. 
 *
 *   * Neither the name of the National Semiconductor Corporation nor 
 *     the names of its contributors may be used to endorse or promote 
 *     products derived from this software without specific prior 
 *     written permission. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
 * NATIONAL SEMICONDUCTOR CORPORATION OR CONTRIBUTORS BE LIABLE FOR ANY 
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE,
 * INTELLECTUAL PROPERTY INFRINGEMENT, OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
 * OF SUCH DAMAGE.
 *
 * EXPORT LAWS: THIS LICENSE ADDS NO RESTRICTIONS TO THE EXPORT LAWS OF 
 * YOUR JURISDICTION. It is licensee's responsibility to comply with 
 * any export regulations applicable in licensee's jurisdiction. Under 
 * CURRENT (2001) U.S. export regulations this software 
 * is eligible for export from the U.S. and can be downloaded by or 
 * otherwise exported or reexported worldwide EXCEPT to U.S. embargoed 
 * destinations which include Cuba, Iraq, Libya, North Korea, Iran, 
 * Syria, Sudan, Afghanistan and any other country to which the U.S. 
 * has embargoed goods and services. 
 *
 * END_NSC_LIC_BSD */

/* NSC_LIC_GPL
 *
 * National Semiconductor Corporation Gnu General Public License for Durango
 *
 * (GPL License with Export Notice)
 *
 * Copyright (c) 1999-2001
 * National Semiconductor Corporation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted 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  
 *
 * In addition to the terms of the GNU General Public License, neither 
 * the name of the National Semiconductor Corporation nor the names of 
 * its contributors may be used to endorse or promote products derived 
 * from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
 * NATIONAL SEMICONDUCTOR CORPORATION OR CONTRIBUTORS BE LIABLE FOR ANY 
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE, 
 * INTELLECTUAL PROPERTY INFRINGEMENT, OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
 * OF SUCH DAMAGE. See the GNU General Public License for more details. 
 *
 * EXPORT LAWS: THIS LICENSE ADDS NO RESTRICTIONS TO THE EXPORT LAWS OF 
 * YOUR JURISDICTION. It is licensee's responsibility to comply with 
 * any export regulations applicable in licensee's jurisdiction. Under 
 * CURRENT (2001) U.S. export regulations this software 
 * is eligible for export from the U.S. and can be downloaded by or 
 * otherwise exported or reexported worldwide EXCEPT to U.S. embargoed 
 * destinations which include Cuba, Iraq, Libya, North Korea, Iran, 
 * Syria, Sudan, Afghanistan and any other country to which the U.S. 
 * has embargoed goods and services. 
 *
 * You should have received a copy of the GNU General Public License 
 * along with this file; if not, write to the Free Software Foundation, 
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 *
 * END_NSC_LIC_GPL */

#define	FS450_DIRECTREG	0

#include "tv_fs450.h"

/*==========================================================================
*
*	Macros
*
*==========================================================================
*/

#undef		fsmax
#undef		fsmin
#define		fsmax(a, b)		((a) > (b) ? (a) : (b))
#define		fsmin(a, b)		((a) < (b) ? (a) : (b))

#undef range_limit
#define range_limit(val,min_val,max_val) (fsmax((min_val),fsmin((val),(max_val))))

/*==========================================================================
*
*	Registers
*
*==========================================================================
*/

#define MAX_REGISTERS	32
#define MAX_BITS		32

#define READ	1
#define WRITE	2
#define READ_WRITE (READ | WRITE)

typedef struct
{
   char *name;
   unsigned long offset;
   unsigned char bit_length;
   unsigned char valid_bits;
   unsigned char read_write;
   char *bitfield_names[MAX_BITS];
}
S_REGISTER_DESCRIP;

typedef struct
{
   int source;
   char *name;
   S_REGISTER_DESCRIP registers[MAX_REGISTERS];
}
S_SET_DESCRIP;

const S_SET_DESCRIP *houston_regs(void);
const S_SET_DESCRIP *encoder_regs(void);
const S_SET_DESCRIP *macrovision_regs(void);
const S_SET_DESCRIP *gcc_regs(void);

/*==========================================================================
*
*	Houston Register Addresses & Bit Definitions
*
*==========================================================================
*/

#define	HOUSTON_IHO				0x00	/*Input Horizontal Offset */
#define	HOUSTON_IVO				0x02	/*Input Vertical Offset */
#define	HOUSTON_IHA				0x04	/*Input Horizontal Active Width */
#define	HOUSTON_VSC				0x06	/*Vertical Scaling Coeficient */
#define	HOUSTON_HSC				0x08	/*Horizontal Scaling Coeficient */
#define	HOUSTON_BYP				0x0A	/*Bypass Register */
#define	HOUSTON_CR				0x0C	/*Control Register */
#define	HOUSTON_SP				0x0E	/*Status */
#define	HOUSTON_NCONL			0x10	/*NCO numerator low word */
#define	HOUSTON_NCONH			0x12	/*NCO numerator high word */
#define	HOUSTON_NCODL			0x14	/*NCO denominator low word */
#define	HOUSTON_NCODH			0x16	/*NCO denominator high word */
#define	HOUSTON_APO				0x18 /**/
#define	HOUSTON_ALO				0x1A /**/
#define	HOUSTON_AFO				0x1C /**/
#define	HOUSTON_HSOUTWID		0x1E /**/
#define	HOUSTON_HSOUTST			0x20 /**/
#define	HOUSTON_HSOUTEND		0x22 /**/
#define	HOUSTON_SHP				0x24	/*Sharpness */
#define	HOUSTON_FLK				0x26	/*Flicker Filter */
#define	HOUSTON_BCONTL			0x28 /**/
#define	HOUSTON_BCONTH			0x2A /**/
#define	HOUSTON_BDONE			0x2C /**/
#define	HOUSTON_BDIAGL			0x2E /**/
#define	HOUSTON_BDIAGH			0x30 /**/
#define	HOUSTON_REV				0x32 /**/
#define	HOUSTON_MISC			0x34 /**/
#define	HOUSTON_FFO				0x36 /**/
#define	HOUSTON_FFO_LAT			0x38 /**/
#define HOUSTON_VSOUTWID		0x3A
#define HOUSTON_VSOUTST			0x3C
#define HOUSTON_VSOUTEND		0x3E
/*//	BYP Register Bits*/
#define	BYP_RGB_BYPASS			0x0001
#define	BYP_HDS_BYPASS			0x0002
#define	BYP_HDS_TBYPASS			0x0004
#define	BYP_CAC_BYPASS			0x0008
#define	BYP_R2V_SBYPASS			0x0010
#define	BYP_R2V_BYPASS			0x0020
#define	BYP_VDS_BYPASS			0x0040
#define	BYP_FFT_BYPASS			0x0080
#define	BYP_FIF_BYPASS			0x0100
#define	BYP_FIF_TBYPASS			0x0200
#define	BYP_HUS_BYPASS			0x0400
#define	BYP_HUS_TBYPASS			0x0800
#define	BYP_CCR_BYPASS			0x1000
#define	BYP_PLL_BYPASS			0x2000
#define	BYP_NCO_BYPASS			0x4000
#define	BYP_ENC_BYPASS			0x8000
/*//	CR Register Bits*/
#define	CR_RESET				0x0001
#define	CR_CLKOFF				0x0002
#define	CR_NCO_EN				0x0004
#define	CR_COMPOFF				0x0008
#define	CR_YCOFF				0x0010
#define	CR_LP_EN				0x0020
#define	CR_CACQ_CLR				0x0040
#define	CR_FFO_CLR				0x0080
#define	CR_656_PAL_NTSC			0x0100
#define	CR_656_STD_VMI			0x0200
#define	CR_OFMT					0x0400
#define	CR_UIM_CLK				0x0800
#define	CR_UIM_DEC				0x1000
#define	CR_BIPGEN_EN1			0x2000
#define	CR_UIM_MOD0				0x4000
#define	CR_UIM_MOD1				0x8000
/*//	Status Register Bits*/
#define	SP_CACQ_ST				0x0001
#define	SP_FFO_ST				0x0002
#define	SP_REVID_MASK			0x7FFC
#define	SP_MV_EN				0x8000
/*//	BDONE Register Bits*/
#define	BDONE_BIST_DONE_A		0x0001
#define	BDONE_BIST_DONE_B		0x0002
#define	BDONE_BIST_DONE_C		0x0004
#define	BDONE_BIST_DONE_D		0x0008
#define	BDONE_BIST_DONE_E		0x0010
#define	BDONE_BIST_DONE_F		0x0020
#define	BDONE_BIST_DONE_G		0x0040
/*//	BDIAGL Register Bits*/
#define	BDIAGL_BIST_DIAG_A		0x000F
#define	BDIAGL_BIST_DIAG_B		0x00F0
#define	BDIAGL_BIST_DIAG_C		0x0F00
#define	BDIAGL_BIST_DIAG_D		0xF000
/*//	BDIAGH Register Bits*/
#define	BDIAGH_BIST_DIAG_E		0x000F
#define	BDIAGH_BIST_DIAG_F		0x000F
#define	BDIAGH_BIST_DIAG_G		0x000F
/*//	MISC Register Bits*/
#define	MISC_TV_SHORT_FLD		0x0001
#define	MISC_ENC_TEST			0x0002
#define	MISC_DAC_TEST			0x0004
#define	MISC_MV_SOFT_EN			0x0008
#define	MISC_NCO_LOAD0			0x0010
#define	MISC_NCO_LOAD1			0x0020
#define	MISC_VGACKDIV			0x0200
#define	MISC_BRIDGE_SYNC		0x0400
#define	MISC_GTLIO_PD			0x8000
/*==========================================================================
*
*	Encoder Registers & Bit Definitions
*
*==========================================================================
*/
#define	ENC_CHROMA_FREQ		0x40
#define	ENC_CHROMA_PHASE	0x44
#define	ENC_REG05			0x45
#define	ENC_REG06			0x46
#define	ENC_REG07			0x47
#define	ENC_HSYNC_WIDTH		0x48
#define	ENC_BURST_WIDTH		0x49
#define	ENC_BACK_PORCH		0x4A
#define	ENC_CB_BURST_LEVEL	0x4B
#define	ENC_CR_BURST_LEVEL	0x4C
#define	ENC_SLAVE_MODE		0x4D
#define	ENC_BLACK_LEVEL		0x4e
#define	ENC_BLANK_LEVEL		0x50
#define	ENC_NUM_LINES		0x57
#define	ENC_WHITE_LEVEL		0x5e
#define	ENC_CB_GAIN			0x60
#define	ENC_CR_GAIN			0x62
#define	ENC_TINT			0x65
#define	ENC_BREEZE_WAY		0x69
#define	ENC_FRONT_PORCH		0x6C
#define	ENC_ACTIVELINE		0x71
#define	ENC_FIRST_LINE		0x73
#define	ENC_REG34			0x74
#define	ENC_SYNC_LEVEL		0x75
#define	ENC_VBI_BLANK_LEVEL	0x7C
#define	ENC_RESET			0x7e
#define	ENC_NOTCH_FILTER	0x8d
/*==========================================================================
*
*	Macrovision Registers & Bit Definitions
*
*==========================================================================
*/
#define		MV_N0			0x59
#define		MV_N1			0x52
#define		MV_N2			0x7b
#define		MV_N3			0x53
#define		MV_N4			0x79
#define		MV_N5			0x5d
#define		MV_N6			0x7a
#define		MV_N7			0x64
#define		MV_N8			0x54
#define		MV_N9			0x55
#define		MV_N10			0x56
#define		MV_N11			0x6d
#define		MV_N12			0x6f
#define		MV_N13			0x5a
#define		MV_N14			0x5b
#define		MV_N15			0x5c
#define		MV_N16			0x63
#define		MV_N17			0x66
#define		MV_N18			0x68
#define		MV_N19			0x67
#define		MV_N20			0x61
#define		MV_N21			0x6a
#define		MV_N22			0x76
#define		MV_AGC_PULSE_LEVEL	0x77
#define		MV_BP_PULSE_LEVEL	0x78
/*==========================================================================
*
*	The TRACE macro can be used to display debug information.  It can display
*	one or more parameters in a formatted string like printf.  No code will be
*	generated for a release build.  Use double parentheses for compatibility
*	with C #define statements.  Newline characters are not added
*	automatically.  Usage example:
*
*	TRACE(("Number is %d, Name is %s.\n",iNumber,lpszName))
*
*==========================================================================
*/
/*//#ifdef _DEBUG*/
/*//void trace(const char *p_fmt,...);*/
/*//#define TRACE(parameters) {trace parameters;}*/
/*//#else*/
#define TRACE(parameters) {}
/*//#endif*/
/****/
/*//	GCC timing structure.*/
/****/
      typedef struct _S_TIMING_SPECS
{
   int vga_width;
   int vga_lines;
   int tv_width;
   int tv_lines;
   int h_total;
   int h_sync;
   int v_total;
   int v_sync;
}
S_TIMING_SPECS;

/****/
/*//	Revision of Houston chip*/
/****/
#define HOUSTON_REV_A 0
#define HOUSTON_REV_B 1
static int houston_Rev(void);

/*==========================================================================
*
*	Functions
*
*==========================================================================
*/

static int houston_init(void);

static unsigned char PLAL_FS450_i2c_address(void);
static int PLAL_FS450_UIM_mode(void);
static int PLAL_ReadRegister(S_REG_INFO * p_reg);
static int PLAL_WriteRegister(const S_REG_INFO * p_reg);
static int PLAL_IsTVOn(void);
static int PLAL_EnableVga(void);
static int PLAL_PrepForTVout(void);
static int PLAL_SetTVTimingRegisters(const S_TIMING_SPECS * p_specs);
static int PLAL_FinalEnableTVout(unsigned long vga_mode);

/****/
/*Direct Memory Access Functions*/
/****/
/*NOTE: Cx5530 is assumed hardcoded at 0x10000 offset*/
/*from MediaGX base. F4Bar is bogus as described in the*/
/*Cx5530 datasheet (actually points to GX frame buffer).*/
/****/
static int
DMAL_ReadUInt32(unsigned long phys_addr, unsigned long *p_data)
{
   *p_data = READ_REG32(phys_addr);
   return 0;
}

static int
DMAL_WriteUInt32(unsigned long phys_addr, unsigned long data)
{
   WRITE_REG32(phys_addr, data);
   return 0;
}

/****/
/*Houston register access functions.*/
/****/
static int
houston_ReadReg(unsigned int reg, unsigned long *p_value, unsigned int bytes)
{
   return gfx_i2c_read(1, PLAL_FS450_i2c_address(), (unsigned char)reg,
		       (unsigned char)bytes, (unsigned char *)p_value);
}

static int
houston_WriteReg(unsigned int reg, unsigned long value, unsigned int bytes)
{
   return gfx_i2c_write(1, PLAL_FS450_i2c_address(), (unsigned char)reg,
			(unsigned char)bytes, (unsigned char *)&value);
}

/****/
/*TV configuration functions.*/
/****/
static int config_init(void);
static const S_TIMING_SPECS *p_specs(void);
static void config_power(int on);
static void config_vga_mode(unsigned long vga_mode);
static void config_tv_std(unsigned long tv_std, unsigned int trigger_bits);
static void conget_tv_std(unsigned long *p_tv_std);
static unsigned long supported_standards(void);
static void config_tvout_mode(unsigned long tvout_mode);
static void conget_tvout_mode(unsigned long *p_tvout_mode);
static void config_overscan_xy(unsigned long tv_std, unsigned long vga_mode,
			       int overscan_x, int overscan_y, int pos_x,
			       int pos_y);
static void config_nco(unsigned long tv_std, unsigned long vga_mode);
static void config_sharpness(int sharpness);
static void conget_sharpness(int *p_sharpness);
static void config_flicker(int flicker);
static void conget_flicker(int *p_flicker);
static void config_color(int color);
static void conget_color(int *p_color);
static void config_brightness_contrast(unsigned long tv_std,
				       unsigned int trigger_bits,
				       int brightness, int contrast);
static void conget_brightness_contrast(unsigned long tv_std,
				       unsigned int trigger_bits,
				       int *p_brightness, int *p_contrast);
static void config_yc_filter(unsigned long tv_std, int luma_filter,
			     int chroma_filter);
static void conget_yc_filter(int *p_luma_filter, int *p_chroma_filter);
static void config_macrovision(unsigned long tv_std,
			       unsigned int cp_trigger_bits);
static void conget_macrovision(unsigned long tv_std,
			       unsigned int *p_cp_trigger_bits);

/****/
/*Device settings.*/
/****/
typedef struct _S_DEVICE_SETTINGS
{
   int tv_on;
   unsigned long vga_mode;
   unsigned long tv_std;
   unsigned long tvout_mode;
   int overscan_x;
   int overscan_y;
   int position_x;
   int position_y;
   int sharpness;
   int flicker;
   int color;
   int brightness;
   int contrast;
   unsigned char yc_filter;
   unsigned int aps_trigger_bits;
   int last_overscan_y;
}
S_DEVICE_SETTINGS;

static S_DEVICE_SETTINGS d;

/*//==========================================================================*/
/****/
/*TV Setup Parameters*/
/****/
/*//==========================================================================*/

static const struct
{
   unsigned long chroma_freq[5];
   unsigned short chroma_phase[5];
   unsigned short cphase_rst[5];
   unsigned short color[5];
   unsigned short cr_burst_level[5];
   unsigned short cb_burst_level[5];
   unsigned short sys625_50[5];
   unsigned short vsync5[5];
   unsigned short pal_mode[5];
   unsigned short hsync_width[5];
   unsigned short burst_width[5];
   unsigned short back_porch[5];
   unsigned short front_porch[5];
   unsigned short breeze_way[5];
   unsigned short activeline[5];
   unsigned short blank_level[5];
   unsigned short vbi_blank_level[5];
   unsigned short black_level[5];
   unsigned short white_level[5];
   unsigned short hamp_offset[5];
   unsigned short sync_level[5];
   unsigned short tv_lines[5];
   unsigned short tv_width[5];
   unsigned short tv_active_lines[5];
   unsigned short tv_active_width[5];
   unsigned char notch_filter[5];
   unsigned short houston_cr[5];
   unsigned short houston_ncodl[5];
   unsigned short houston_ncodh[5];
}
tvsetup =
{
   /*     ntsc,        pal,   ntsc-eij,      pal-m,      pal-n */
   {
   0x1f7cf021, 0xcb8a092a, 0x1f7cf021, 0xe3efe621, 0xcb8a092a}
   ,					/*chroma_freq */
   {
   0, 0, 0, 0, 0}
   ,					/*chroma_phase */
   {
   2, 0, 2, 0, 0}
   ,					/*cphase_rst */
   {
   54, 43, 54, 43, 43}
   ,					/*color */
   {
   0, 31, 0, 29, 29}
   ,					/*cr_burst_level */
   {
   59, 44, 59, 41, 41}
   ,					/*cb_burst_level */
   {
   0, 1, 0, 0, 1}
   ,					/*sys625_50 */
   {
   0, 1, 0, 0, 0}
   ,					/*vsync5 */
   {
   0, 1, 0, 1, 1}
   ,					/*pal_mode */
   {
   0x7a, 0x7a, 0x7a, 0x7a, 0x7a}
   ,					/*hsync_width */
   {
   0x40, 0x3c, 0x40, 0x40, 0x3c}
   ,					/*burst_width */
   {
   0x80, 0x9a, 0x80, 0x80, 0x9a}
   ,					/*back_porch */
   {
   0x24, 0x1e, 0x24, 0x24, 0x1e}
   ,					/*front_porch */
   {
   0x19, 0x1a, 0x19, 0x12, 0x1a}
   ,					/*breeze_way */
   {
   0xb4, 0xb4, 0xb4, 0xb4, 0xb4}
   ,					/*active_line */
   {
   240, 251, 240, 240, 240}
   ,					/*blank_level */
   {
   240, 251, 240, 240, 240}
   ,					/*vbi_blank_level */
   {
   284, 252, 240, 252, 252}
   ,					/*black_level */
   {
   823, 821, 823, 821, 821}
   ,					/*white_level */
   {
   60, 48, 60, 48, 48}
   ,					/*hamp_offset */
   {
   0x08, 0x08, 0x08, 0x08, 0x08}
   ,					/*sync_level */
   {
   525, 625, 525, 525, 625}
   ,					/*tv_lines */
   {
   858, 864, 858, 858, 864}
   ,					/*tv_width */
   {
   487, 576, 487, 487, 576}
   ,					/*tv_active_lines */
   {
   800, 800, 800, 800, 800}
   ,					/*tv_active_width */
   {
   0x1a, 0x1d, 0x1a, 0x1d, 0x1d}
   ,					/*notch filter enabled */
   {
   0x0000, 0x0100, 0x0000, 0x0000, 0x0100}
   ,					/*houston cr pal */
   {
   0x7e48, 0xf580, 0x7e48, 0x7e48, 0xf580}
   ,					/*houston ncodl */
   {
   0x001b, 0x0020, 0x001b, 0x001b, 0x0020}	/*houston ncodh */
};

/****/
/*MediaGX default underscan and centered position setups.*/
/****/
#define	SCANTABLE_ENTRIES	5
struct _scantable
{
   unsigned long mode;
   unsigned short v_total[5];
   unsigned short v_sync[5];
   unsigned short iha[5];
   signed short iho[5];
   signed short hsc[5];
};

static struct _scantable scantable[SCANTABLE_ENTRIES] = {
   {
    GFX_VGA_MODE_640X480,
    {617, 624, 617, 624, 624},		/*v_total */
    {69, 88, 69, 88, 88},		/*v_sync */
    {720, 720, 720, 720, 720},		/*iha */
    {0, 0, 0, 0, 0},			/*iho */
    {-12, 0, -6, 0, 0}			/*hsc */
    },
   {
    GFX_VGA_MODE_800X600,
    {740, 740, 740, 740, 740},		/*v_total */
    {90, 88, 90, 88, 88},		/*v_sync */
    {720, 720, 508, 720, 720},		/*iha */
    {-8, 11, -8, -8, 11},		/*iho */
    {-27, -27, -27, -27, -27}		/*hsc */
    },
   {
    GFX_VGA_MODE_720X487,
    {525, 720, 525, 720, 720},		/*v_total */
    {23, 230, 23, 230, 230},		/*v_sync */
    {720, 720, 720, 720, 720},		/*iha */
    {0xa2, 0xa2, 0xa2, 0xa2, 0xa2},	/*iho */
    {0, 0, 0, 0, 0}			/*hsc */
    },
   {
    GFX_VGA_MODE_720X576,
    {720, 625, 720, 625, 625},		/*v_total */
    {129, 25, 129, 25, 25},		/*v_sync */
    {720, 720, 720, 720, 720},		/*iha */
    {0xaa, 0xaa, 0xaa, 0xaa, 0xaa},	/*iho */
    {0, 0, 0, 0, 0}			/*hsc */
    },
   {
    GFX_VGA_MODE_1024X768,
    {933, 942, 933, 806, 806},		/*v_total */
    {121, 112, 121, 88, 88},		/*v_sync */
    {600, 600, 600, 600, 600},		/*iha */
    {0x3c, 0x23, 0x3c, 0x65, 0x65},	/*iho */
    {35, 26, 35, 26, 26}		/*hsc */
    },
};

/****/
/*Houston fifo configuration constants.*/
/****/
struct _ffolat
{
   int v_total;
   unsigned short ffolat;
};

struct _ffolativo
{
   int v_total;
   unsigned short ivo;
   unsigned short ffolat;
};

/*h_total=832, ivo=40, tv_width=858, tv_lines=525, vga_lines=480*/
#define SIZE6X4NTSC		66
static struct _ffolat ffo6x4ntsc[SIZE6X4NTSC + 1] = {
   {541, 0x40}, {545, 0x40}, {549, 0x40}, {553, 0x40},
   {557, 0x58}, {561, 0x40}, {565, 0x40}, {569, 0x40},
   {573, 0x48}, {577, 0x40}, {581, 0x40}, {585, 0x40},
   {589, 0x40}, {593, 0x48}, {597, 0x40}, {601, 0x40},
   {605, 0x40}, {609, 0x40}, {613, 0x5b}, {617, 0x48},
   {621, 0x60}, {625, 0x48}, {629, 0x48}, {633, 0x40},
   {637, 0x5e}, {641, 0x40}, {645, 0x50}, {649, 0x56},
   {653, 0x58}, {657, 0x6c}, {661, 0x40}, {665, 0x40},
   {669, 0x40}, {673, 0x40}, {677, 0x40}, {681, 0x40},
   {685, 0x40}, {689, 0x40}, {693, 0x40}, {697, 0x40},
   {701, 0x40}, {705, 0x40}, {709, 0x40}, {713, 0x40},
   {717, 0x40}, {721, 0x40}, {725, 0x40}, {729, 0x40},
   {733, 0x40}, {737, 0x40}, {741, 0x40}, {745, 0x40},
   {749, 0x40}, {753, 0x40}, {757, 0x40}, {761, 0x40},
   {765, 0x40}, {769, 0x40}, {773, 0x40}, {777, 0x40},
   {781, 0x40}, {785, 0x40}, {789, 0x40}, {793, 0x40},
   {797, 0x30}, {801, 0x40},
   {-1, 0}
};

#define SIZE6X4PAL		45
static struct _ffolat ffo6x4pal[SIZE6X4PAL + 1] = {
   {625, 0x60}, {629, 0x60}, {633, 0x60}, {637, 0x60},
   {641, 0x50}, {645, 0x60}, {649, 0x60}, {653, 0x60},
   {657, 0x60}, {661, 0x60}, {665, 0x60}, {669, 0x60},
   {673, 0x60}, {677, 0x60}, {681, 0x60}, {685, 0x60},
   {689, 0x60}, {693, 0x60}, {697, 0x60}, {701, 0x60},
   {705, 0x60}, {709, 0x60}, {713, 0x60}, {717, 0x60},
   {721, 0x60}, {725, 0x60}, {729, 0x60}, {733, 0x60},
   {737, 0x60}, {741, 0x60}, {745, 0x60}, {749, 0x60},
   {753, 0x60}, {757, 0x60}, {761, 0x60}, {765, 0x60},
   {769, 0x60}, {773, 0x60}, {777, 0x60}, {781, 0x60},
   {785, 0x60}, {789, 0x60}, {793, 0x60}, {797, 0x60},
   {801, 0x60},
   {-1, 0}
};

#define SIZE7X4NTSC		40
static struct _ffolat ffo7x4ntsc[SIZE7X4NTSC + 1] = {
   {525, 0x52}, {529, 0x52}, {533, 0x52}, {537, 0x52},
   {541, 0x52}, {545, 0x40}, {549, 0x40}, {553, 0x40},
   {557, 0x58}, {561, 0x40}, {565, 0x58}, {569, 0x40},
   {573, 0x48}, {577, 0x40}, {581, 0x40}, {585, 0x40},
   {589, 0x40}, {593, 0x48}, {597, 0x40}, {601, 0x40},
   {605, 0x40}, {609, 0x40}, {613, 0x5b}, {617, 0x48},
   {621, 0x60}, {625, 0x48}, {629, 0x48}, {633, 0x40},
   {637, 0x5e}, {641, 0x40}, {645, 0x50}, {649, 0x56},
   {653, 0x58}, {657, 0x6c}, {661, 0x40}, {665, 0x40},
   {669, 0x40}, {673, 0x40}, {677, 0x40}, {681, 0x40},
   {-1, 0}
};

#define SIZE7X4PAL		24
static struct _ffolat ffo7x4pal[SIZE7X4PAL + 1] = {
   {625, 0x60}, {629, 0x60}, {633, 0x60}, {637, 0x60},
   {641, 0x50}, {645, 0x60}, {649, 0x60}, {653, 0x60},
   {657, 0x60}, {661, 0x60}, {665, 0x60}, {669, 0x60},
   {673, 0x60}, {677, 0x60}, {681, 0x60}, {685, 0x60},
   {689, 0x60}, {693, 0x60}, {697, 0x60}, {701, 0x60},
   {705, 0x60}, {709, 0x60}, {713, 0x60}, {717, 0x60},
   {-1, 0}
};

#define SIZE7X5NTSC		54
static struct _ffolat ffo7x5ntsc[SIZE7X5NTSC + 1] = {
   {590, 0x40}, {594, 0x48}, {598, 0x40}, {602, 0x40},
   {606, 0x40}, {610, 0x40}, {614, 0x5b}, {618, 0x48},
   {622, 0x60}, {626, 0x48}, {630, 0x48}, {634, 0x40},
   {638, 0x5e}, {642, 0x40}, {646, 0x50}, {650, 0x56},
   {654, 0x58}, {658, 0x6c}, {662, 0x40}, {666, 0x40},
   {670, 0x40}, {674, 0x40}, {678, 0x40}, {682, 0x40},
   {686, 0x40}, {690, 0x40}, {694, 0x40}, {698, 0x40},
   {702, 0x40}, {706, 0x40}, {710, 0x40}, {714, 0x40},
   {718, 0x40}, {722, 0x40}, {726, 0x40}, {730, 0x40},
   {734, 0x40}, {738, 0x40}, {742, 0x40}, {746, 0x40},
   {750, 0x40}, {754, 0x40}, {758, 0x40}, {762, 0x40},
   {766, 0x40}, {770, 0x40}, {774, 0x40}, {778, 0x40},
   {782, 0x40}, {786, 0x40}, {790, 0x40}, {794, 0x40},
   {798, 0x30}, {802, 0x40},
   {-1, 0}
};

#define SIZE7X5PAL		45
static struct _ffolat ffo7x5pal[SIZE7X5PAL + 1] = {
   {625, 0x60}, {629, 0x60}, {633, 0x60}, {637, 0x60},
   {641, 0x50}, {645, 0x60}, {649, 0x60}, {653, 0x60},
   {657, 0x60}, {661, 0x60}, {665, 0x60}, {669, 0x60},
   {673, 0x60}, {677, 0x60}, {681, 0x60}, {685, 0x60},
   {689, 0x60}, {693, 0x60}, {697, 0x60}, {701, 0x60},
   {705, 0x60}, {709, 0x60}, {713, 0x60}, {717, 0x60},
   {721, 0x60}, {725, 0x60}, {729, 0x60}, {733, 0x60},
   {737, 0x60}, {741, 0x60}, {745, 0x60}, {749, 0x60},
   {753, 0x60}, {757, 0x60}, {761, 0x60}, {765, 0x60},
   {769, 0x60}, {773, 0x60}, {777, 0x60}, {781, 0x60},
   {785, 0x60}, {789, 0x60}, {793, 0x60}, {797, 0x60},
   {801, 0x60},
   {-1, 0}
};

/*h_total=1056, vga_lines=600*/
#define	SIZE8X6NTSC		37
static struct _ffolat ffo8x6ntsc[SIZE8X6NTSC + 1] = {
   {620, 0x40},				/*v_total_min >= vsync+10 >= vga_lines+10 = 610 */
   {625, 0x58}, {630, 0x40}, {635, 0x40}, {640, 0x40},
   {645, 0x46}, {650, 0x46}, {655, 0x4f}, {660, 0x4c},
   {665, 0x4a}, {670, 0x50}, {675, 0x2f}, {680, 0x48},
   {685, 0x38}, {690, 0x31}, {695, 0x40}, {700, 0x21},
   {705, 0x25}, {710, 0x40}, {715, 0x48}, {720, 0x50},
   {725, 0x30}, {730, 0x50}, {735, 0x50}, {740, 0x50},
   {745, 0x40}, {750, 0x38}, {755, 0x50}, {760, 0x50},
   {765, 0x40}, {770, 0x38}, {775, 0x40}, {780, 0x40},
   {785, 0x40}, {790, 0x38}, {795, 0x50}, {800, 0x50},
   {-1, 0}
};

/*h_total=1056, vga_lines=600*/
#define	SIZE8X6PAL		36
static struct _ffolat ffo8x6pal[SIZE8X6PAL + 1] = {
   {625, 0x80}, {630, 0x80}, {635, 0x5a}, {640, 0x55},
   {645, 0x48}, {650, 0x65}, {655, 0x65}, {660, 0x50},
   {665, 0x80}, {670, 0x70}, {675, 0x56}, {680, 0x80},
   {685, 0x58}, {690, 0x31}, {695, 0x80}, {700, 0x60},
   {705, 0x45}, {710, 0x4a}, {715, 0x50}, {720, 0x50},
   {725, 0x50}, {730, 0x45}, {735, 0x50}, {740, 0x50},
   {745, 0x50}, {750, 0x50}, {755, 0x50}, {760, 0x50},
   {765, 0x50}, {770, 0x50}, {775, 0x50}, {780, 0x50},
   {785, 0x50}, {790, 0x50}, {795, 0x50}, {800, 0x50},
   {-1, 0}
};

/*h_total=1344, vga_lines=768*/
#define	SIZE10X7NTSC		45
static struct _ffolativo ffo10x7ntsc[SIZE10X7NTSC] = {
   {783, 0x4d, 0x40},
   {789, 0x47, 0x14},
   {795, 0x47, 0x7f},
   {801, 0x47, 0x53},
   {807, 0x47, 0x11},
   {813, 0x47, 0x78},
   {819, 0x47, 0x54},
   {825, 0x47, 0x40},
   {831, 0x47, 0x0f},
   {837, 0x4d, 0x40},
   {843, 0x47, 0x5a},
   {849, 0x4d, 0x40},
   {855, 0x47, 0x4b},
   {861, 0x4d, 0x40},
   {867, 0x47, 0x4b},
   {873, 0x4d, 0x40},
   {879, 0x47, 0x07},
   {885, 0x48, 0x20},
   {891, 0x47, 0x82},
   {897, 0x47, 0x60},
   {903, 0x47, 0x7f},
   {909, 0x4d, 0x40},
   {915, 0x48, 0x40},
   {921, 0x4c, 0x40},
   {927, 0x49, 0x40},
   {933, 0x48, 0x40},
   {939, 0x4a, 0x40},
   {945, 0x46, 0x40},
   {951, 0x4a, 0x40},
   {957, 0x4a, 0x40},
   {963, 0x4b, 0x40},
   {969, 0x4b, 0x40},
   {975, 0x48, 0x40},
   {981, 0x47, 0x40},
   {987, 0x47, 0x40},
   {993, 0x47, 0x40},
   {999, 0x48, 0x40},
   {1005, 0x48, 0x40},
   {1011, 0x47, 0x40},
   {1017, 0x47, 0x40},
   {1023, 0x48, 0x40},
   {1029, 0x48, 0x40},
   {1035, 0x46, 0x40},
   {1041, 0x47, 0x40},
   {1047, 0x47, 0x40}
};

/*h_total=1344, vga_lines=768*/
#define	SIZE10X7PAL		46
static struct _ffolativo ffo10x7pal[SIZE10X7PAL] = {
   {781, 0x49, 0x40},
   {787, 0x46, 0x40},
   {793, 0x48, 0x40},
   {799, 0x46, 0x40},
   {805, 0x49, 0x40},
   {811, 0x47, 0x40},
   {817, 0x46, 0x40},
   {823, 0x46, 0x56},
   {829, 0x46, 0x2d},
   {835, 0x46, 0x40},
   {841, 0x46, 0x2d},
   {847, 0x46, 0x3f},
   {853, 0x46, 0x10},
   {859, 0x46, 0x86},
   {865, 0x46, 0xc9},
   {871, 0x46, 0x83},
   {877, 0x46, 0xa8},
   {883, 0x46, 0x81},
   {889, 0x46, 0xa5},
   {895, 0x46, 0xa9},
   {901, 0x46, 0x81},
   {907, 0x46, 0xa4},
   {913, 0x46, 0xa5},
   {919, 0x46, 0x7f},
   {925, 0x46, 0xa2},
   {931, 0x46, 0x9d},
   {937, 0x46, 0xc1},
   {943, 0x46, 0x96},
   {949, 0x46, 0xb7},
   {955, 0x46, 0xb1},
   {961, 0x46, 0x8a},
   {967, 0x46, 0xa9},
   {973, 0x46, 0xa0},
   {979, 0x46, 0x40},
   {985, 0x46, 0x97},
   {991, 0x46, 0xb5},
   {997, 0x46, 0xaa},
   {1003, 0x46, 0x83},
   {1009, 0x46, 0x9f},
   {1015, 0x47, 0x40},
   {1021, 0x46, 0xad},
   {1027, 0x46, 0x87},
   {1033, 0x46, 0xa2},
   {1039, 0x47, 0x40},
   {1045, 0x46, 0xac},
   {1051, 0x46, 0x86}
};

/*//==========================================================================*/
/****/
/*FS450 API Functions.*/
/****/
/*//==========================================================================*/

/****/
/*Initialize device settings*/
/****/
static void
initialize_houston_static_registers(void)
{
   houston_WriteReg(HOUSTON_BYP, 0, 2);
   houston_WriteReg(HOUSTON_APO, 0, 2);
   houston_WriteReg(HOUSTON_ALO, 0, 2);
   houston_WriteReg(HOUSTON_AFO, 0, 2);
   houston_WriteReg(HOUSTON_BCONTL, 0, 2);
   houston_WriteReg(HOUSTON_BCONTH, 0, 2);
   houston_WriteReg(HOUSTON_BDONE, 0, 2);
   houston_WriteReg(HOUSTON_BDIAGL, 0, 2);
   houston_WriteReg(HOUSTON_BDIAGH, 0, 2);
   houston_WriteReg(HOUSTON_MISC, 0, 2);
}

int
FS450_init(void)
{
   int err;

   TRACE(("FS450_Init()\n"))

	 err = houston_init();
   if (err)
      return err;

   initialize_houston_static_registers();

#if 1
   d.tv_on = PLAL_IsTVOn()? 1 : 0;
#else
   d.tv_on = 0;
#endif

#if 1
   /*get the current tv standard */
   conget_tv_std(&d.tv_std);
#else
   /*default to VP_TV_STANDARD_NTSC_M */
   d.tv_std = VP_TV_STANDARD_NTSC_M;
   config_tv_std(d.tv_std);
#endif

   d.vga_mode = 0;

#if 0
   /*get the current tvout mode */
   conget_tvout_mode(&d.tvout_mode);
#else
   /*default to VP_TVOUT_MODE_CVBS_YC */
   d.tvout_mode = GFX_TVOUT_MODE_CVBS_YC;
#endif

#if 0
   /*get the current sharpness */
   conget_sharpness(d.sharpness);
#else
   /*default to 1000 out of 1000 */
   d.sharpness = 1000;
   config_sharpness(d.sharpness);
#endif

#if 0
   /*get the current flicker */
   conget_flicker(d.flicker);
#else
   /*default to 800 out of 1000 */
   d.flicker = 800;
   config_flicker(d.flicker);
#endif

#if 0
   /*get the current size and position */
#else
   /*default to zeros */
   d.overscan_x = 0;
   d.overscan_y = 0;
   d.position_x = 0;
   d.position_y = 0;
#endif

#if 0
   /*get the current color */
   conget_color(d.color);
#else
   d.color = 50;
   /*//d.color = tvsetup.color[k]; */
   config_color(d.color);
#endif

#if 0
   /*get the current brightness and contrast */
   conget_brightness_contrast(d.tv_std, d.aps_trigger_bits, d.brightness,
			      d.contrast);
#else
   /*default */
   d.brightness = 50;
   d.contrast = 60;
   config_brightness_contrast(d.tv_std, d.aps_trigger_bits, d.brightness,
			      d.contrast);
#endif

#if 1
   /*get the current yc filtering */
   {
      int luma_filter, chroma_filter;

      conget_yc_filter(&luma_filter, &chroma_filter);
      d.yc_filter = 0;
      if (luma_filter)
	 d.yc_filter |= GFX_LUMA_FILTER;
      if (chroma_filter)
	 d.yc_filter |= GFX_CHROMA_FILTER;
   }
#else
   /*default */
   d.yc_filter = GFX_LUMA_FILTER + GFX_CHROMA_FILTER;
#endif

#if 0
   /*get the current cp settings */
   conget_macrovision(d.tv_std, &d.aps_trigger_bits);
#else
   d.aps_trigger_bits = 0;
   config_macrovision(d.tv_std, d.aps_trigger_bits);
#endif

   d.last_overscan_y = -10000;

   return 0;
}

void
FS450_cleanup(void)
{
}

/*//==========================================================================*/
/****/
/*//	Required configuration calls to write new settings to the device*/

#define REQ_TV_STANDARD_BIT			0x0002
#define REQ_VGA_MODE_BIT			0x0004
#define REQ_TVOUT_MODE_BIT			0x0008
#define REQ_SHARPNESS_BIT			0x0010
#define REQ_FLICKER_BIT				0x0020
#define REQ_OVERSCAN_POSITION_BIT	0x0040
#define REQ_COLOR_BIT				0x0080
#define REQ_BRIGHTNESS_CONTRAST_BIT 0x0100
#define REQ_YC_FILTER_BIT			0x0200
#define REQ_MACROVISION_BIT			0x0400
#define REQ_NCO_BIT					0x1000

#define REQ_TV_STANDARD			(REQ_TV_STANDARD_BIT | REQ_OVERSCAN_POSITION | REQ_BRIGHTNESS_CONTRAST | REQ_MACROVISION_BIT | REQ_YC_FILTER)
#define REQ_VGA_MODE			(REQ_VGA_MODE_BIT | REQ_OVERSCAN_POSITION)
#define REQ_TVOUT_MODE			(REQ_TVOUT_MODE_BIT)
#define REQ_SHARPNESS			(REQ_SHARPNESS_BIT)
#define REQ_FLICKER				(REQ_FLICKER_BIT)
#define REQ_OVERSCAN_POSITION	(REQ_OVERSCAN_POSITION_BIT | REQ_NCO)
#define REQ_COLOR				(REQ_COLOR_BIT)
#define REQ_BRIGHTNESS_CONTRAST	(REQ_BRIGHTNESS_CONTRAST_BIT)
#define REQ_YC_FILTER			(REQ_YC_FILTER_BIT)
#define REQ_MACROVISION			(REQ_TV_STANDARD_BIT | REQ_BRIGHTNESS_CONTRAST_BIT | REQ_MACROVISION_BIT)
#define REQ_NCO					(REQ_NCO_BIT)
#define REQ_ENCODER				(REQ_TV_STANDARD | REQ_COLOR | REQ_BRIGHTNESS_CONTRAST | REQ_YC_FILTER)

static int
write_config(int req)
{
   unsigned long reg, reg_encoder_reset = 0;
   int reset;

   /*if we're changing the nco, and the vertical scaling has changed... */
   reset = ((REQ_NCO_BIT & req) && (d.overscan_y != d.last_overscan_y));
   if (reset) {
      /*put the encoder into reset while making changes */
      houston_ReadReg(ENC_RESET, &reg, 1);
      houston_WriteReg(ENC_RESET, reg | 0x01, 1);
      reg_encoder_reset = reg & 0x01;
   }

   if (REQ_TV_STANDARD_BIT & req)
      config_tv_std(d.tv_std, d.aps_trigger_bits);

   if (REQ_VGA_MODE_BIT & req)
      config_vga_mode(d.vga_mode);

   if (REQ_TVOUT_MODE_BIT & req)
      config_tvout_mode(d.tvout_mode);

   if (REQ_OVERSCAN_POSITION_BIT & req) {
      config_overscan_xy(d.tv_std,
			 d.vga_mode,
			 d.overscan_x,
			 d.overscan_y, d.position_x, d.position_y);

      /*h_timing and v_timing and syncs. */
      if (PLAL_IsTVOn())
	 PLAL_SetTVTimingRegisters(p_specs());
   }

   if (REQ_NCO_BIT & req)
      config_nco(d.tv_std, d.vga_mode);

   if (REQ_SHARPNESS_BIT & req)
      config_sharpness(d.sharpness);

   if (REQ_FLICKER_BIT & req)
      config_flicker(d.flicker);

   if (REQ_COLOR_BIT & req)
      config_color(d.color);

   if (REQ_BRIGHTNESS_CONTRAST_BIT & req) {
      config_brightness_contrast(d.tv_std,
				 d.aps_trigger_bits,
				 d.brightness, d.contrast);
   }

   if (REQ_YC_FILTER_BIT & req) {
      config_yc_filter(d.tv_std,
		       (d.yc_filter & GFX_LUMA_FILTER),
		       (d.yc_filter & GFX_CHROMA_FILTER));
   }

   if (REQ_MACROVISION_BIT & req)
      config_macrovision(d.tv_std, d.aps_trigger_bits);

   /*if we decided to put the encoder into reset, put it back */
   if (reset) {
      houston_ReadReg(ENC_RESET, &reg, 1);
      houston_WriteReg(ENC_RESET, reg_encoder_reset | (reg & ~0x01), 1);

      d.last_overscan_y = d.overscan_y;
   }
   return 0;
}

/*==========================================================================*/
/****/
/*//	TV On*/

#if GFX_TV_DYNAMIC
int
fs450_get_tv_enable(unsigned int *p_on)
#else
int
gfx_get_tv_enable(unsigned int *p_on)
#endif
{
   if (!p_on)
      return ERR_INVALID_PARAMETER;

   *p_on = d.tv_on;

   return 0;
}

/*//int FS450_set_tv_on(unsigned int on)*/
#if GFX_TV_DYNAMIC
int
fs450_set_tv_enable(int on)
#else
int
gfx_set_tv_enable(int on)
#endif
{
   unsigned long reg;

   /*if not mode change, just return */
   if ((d.tv_on && on) || (!d.tv_on && !on))
      return 0;

   /*if turning off... */
   if (!on) {
      /*reenable vga. */
      PLAL_EnableVga();

      /*power down houston */
      config_power(0);

      d.tv_on = 0;

      return 0;
   }

   /*turning on... */

   /*power up houston      */
   config_power(1);

   /*assert encoder reset. */
   houston_WriteReg(ENC_RESET, 0x01, 1);

   /*initial platform preparation */
   PLAL_PrepForTVout();

   /*configure encoder and nco. */
   write_config(REQ_VGA_MODE |
		REQ_TV_STANDARD |
		REQ_TVOUT_MODE |
		REQ_OVERSCAN_POSITION | REQ_YC_FILTER | REQ_MACROVISION);

   /*set LP_EN and UIM */
   houston_ReadReg(HOUSTON_CR, &reg, 2);
   reg |= CR_LP_EN;
   reg &= ~(CR_UIM_MOD0 | CR_UIM_MOD1);
   reg |= (PLAL_FS450_UIM_mode() << 14);
   houston_WriteReg(HOUSTON_CR, reg, 2);

   /*set platform timing registers */
   PLAL_SetTVTimingRegisters(p_specs());

   PLAL_FinalEnableTVout(d.vga_mode);

   /*sync bridge */
   {
      int retry_count = 0;

      /*sync 50 times */
      while (retry_count++ < 50) {
	 /*sync bridge. */
	 houston_ReadReg(HOUSTON_MISC, &reg, 2);
	 reg |= MISC_BRIDGE_SYNC;
	 houston_WriteReg(HOUSTON_MISC, reg, 2);
	 reg &= ~MISC_BRIDGE_SYNC;
	 houston_WriteReg(HOUSTON_MISC, reg, 2);
      }
   }

   /*deassert encoder reset. */
   houston_WriteReg(ENC_RESET, 0x00, 1);

   d.tv_on = 1;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_tv_defaults(int format)
#else
int
gfx_set_tv_defaults(int format)
#endif
{
   return 0;
}

/*==========================================================================*/
/****/
/*//	TV standard*/

#if GFX_TV_DYNAMIC
int
fs450_get_tv_standard(unsigned long *p_standard)
#else
int
gfx_get_tv_standard(unsigned long *p_standard)
#endif
{
   if (!p_standard)
      return ERR_INVALID_PARAMETER;

   *p_standard = d.tv_std;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_get_available_tv_standards(unsigned long *p_standards)
#else
int
gfx_get_available_tv_standards(unsigned long *p_standards)
#endif
{
   if (!p_standards)
      return ERR_INVALID_PARAMETER;

   *p_standards = supported_standards();

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_tv_standard(unsigned long standard)
#else
int
gfx_set_tv_standard(unsigned long standard)
#endif
{
   /*verify supported standard. */
   if (!(standard & supported_standards()))
      return ERR_INVALID_PARAMETER;

   /*disallow if tv is on */
   if (d.tv_on)
      return ERR_CANNOT_CHANGE_WHILE_TV_ON;

   d.tv_std = standard;
/*//	d.color = tvsetup.color[k];*/

   return write_config(REQ_TV_STANDARD);
}

/*==========================================================================*/
/****/
/*//	vga mode as known by the driver*/
#if GFX_TV_DYNAMIC
int
fs450_get_tv_vga_mode(unsigned long *p_vga_mode)
#else
int
gfx_get_tv_vga_mode(unsigned long *p_vga_mode)
#endif
{
   if (!p_vga_mode)
      return ERR_INVALID_PARAMETER;

   *p_vga_mode = d.vga_mode;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_get_available_tv_vga_modes(unsigned long *p_vga_modes)
#else
int
gfx_get_available_tv_vga_modes(unsigned long *p_vga_modes)
#endif
{
   if (!p_vga_modes)
      return ERR_INVALID_PARAMETER;

   *p_vga_modes =
	 GFX_VGA_MODE_640X480 |
	 GFX_VGA_MODE_720X487 | GFX_VGA_MODE_720X576 | GFX_VGA_MODE_800X600;
   if (houston_Rev() >= HOUSTON_REV_B)
      *p_vga_modes |= GFX_VGA_MODE_1024X768;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_tv_vga_mode(unsigned long vga_mode)
#else
int
gfx_set_tv_vga_mode(unsigned long vga_mode)
#endif
{
   /*reject if not a single valid VGA mode */
   switch (vga_mode) {
   default:
      return ERR_INVALID_PARAMETER;

   case GFX_VGA_MODE_640X480:
   case GFX_VGA_MODE_720X487:
   case GFX_VGA_MODE_720X576:
   case GFX_VGA_MODE_800X600:
      break;

   case GFX_VGA_MODE_1024X768:
      if (houston_Rev() >= HOUSTON_REV_B)
	 break;
      return ERR_INVALID_PARAMETER;
   }

   /*if the mode has changed... */
   if (vga_mode != d.vga_mode) {
      d.vga_mode = vga_mode;

      return write_config(REQ_VGA_MODE);
   }

   return 0;
}

/*==========================================================================*/
/****/
/*//	tvout mode*/

#if GFX_TV_DYNAMIC
int
fs450_get_tvout_mode(unsigned long *p_tvout_mode)
#else
int
gfx_get_tvout_mode(unsigned long *p_tvout_mode)
#endif
{
   if (!p_tvout_mode)
      return ERR_INVALID_PARAMETER;

   *p_tvout_mode = d.tvout_mode;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_tvout_mode(unsigned long tvout_mode)
#else
int
gfx_set_tvout_mode(unsigned long tvout_mode)
#endif
{
   d.tvout_mode = tvout_mode;

   return write_config(REQ_TVOUT_MODE);
}

/*==========================================================================*/
/****/
/*//	Sharpness*/

#if GFX_TV_DYNAMIC
int
fs450_get_sharpness(int *p_sharpness)
#else
int
gfx_get_sharpness(int *p_sharpness)
#endif
{
   if (!p_sharpness)
      return ERR_INVALID_PARAMETER;

   *p_sharpness = d.sharpness;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_sharpness(int sharpness)
#else
int
gfx_set_sharpness(int sharpness)
#endif
{
   d.sharpness = range_limit(sharpness, 0, 1000);

   return write_config(REQ_SHARPNESS);
}

/*==========================================================================*/
/****/
/*flicker filter control.*/

#if GFX_TV_DYNAMIC
int
fs450_get_flicker_filter(int *p_flicker)
#else
int
gfx_get_flicker_filter(int *p_flicker)
#endif
{
   if (!p_flicker)
      return ERR_INVALID_PARAMETER;

   *p_flicker = d.flicker;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_flicker_filter(int flicker)
#else
int
gfx_set_flicker_filter(int flicker)
#endif
{
   d.flicker = range_limit(flicker, 0, 1000);

   return write_config(REQ_FLICKER);
}

/*==========================================================================*/
/****/
/*//	Overscan and Position*/

#if GFX_TV_DYNAMIC
int
fs450_get_overscan(int *p_x, int *p_y)
#else
int
gfx_get_overscan(int *p_x, int *p_y)
#endif
{
   if (!p_x || !p_y)
      return ERR_INVALID_PARAMETER;

   *p_x = d.overscan_x;
   *p_y = d.overscan_y;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_overscan(int x, int y)
#else
int
gfx_set_overscan(int x, int y)
#endif
{
   d.overscan_x = range_limit(x, -1000, 1000);
   d.overscan_y = range_limit(y, -1000, 1000);

   return write_config(REQ_OVERSCAN_POSITION);
}

#if GFX_TV_DYNAMIC
int
fs450_get_position(int *p_x, int *p_y)
#else
int
gfx_get_position(int *p_x, int *p_y)
#endif
{
   if (!p_x || !p_y)
      return ERR_INVALID_PARAMETER;

   *p_x = d.position_x;
   *p_y = d.position_y;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_position(int x, int y)
#else
int
gfx_set_position(int x, int y)
#endif
{
   d.position_x = range_limit(x, -1000, 1000);
   d.position_y = range_limit(y, -1000, 1000);

   return write_config(REQ_OVERSCAN_POSITION);
}

/*==========================================================================*/
/****/
/*//	Color, Brightness, and Contrast*/

#if GFX_TV_DYNAMIC
int
fs450_get_color(int *p_color)
#else
int
gfx_get_color(int *p_color)
#endif
{
   if (!p_color)
      return ERR_INVALID_PARAMETER;

   *p_color = d.color;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_color(int color)
#else
int
gfx_set_color(int color)
#endif
{
   d.color = range_limit(color, 0, 100);

   return write_config(REQ_COLOR);
}

#if GFX_TV_DYNAMIC
int
fs450_get_brightness(int *p_brightness)
#else
int
gfx_get_brightness(int *p_brightness)
#endif
{
   if (!p_brightness)
      return ERR_INVALID_PARAMETER;

   *p_brightness = d.brightness;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_brightness(int brightness)
#else
int
gfx_set_brightness(int brightness)
#endif
{
   d.brightness = range_limit(brightness, 0, 100);

   return write_config(REQ_BRIGHTNESS_CONTRAST);
}

#if GFX_TV_DYNAMIC
int
fs450_get_contrast(int *p_contrast)
#else
int
gfx_get_contrast(int *p_contrast)
#endif
{
   if (!p_contrast)
      return ERR_INVALID_PARAMETER;

   *p_contrast = d.contrast;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_contrast(int constrast)
#else
int
gfx_set_contrast(int constrast)
#endif
{
   d.contrast = range_limit(constrast, 0, 100);

   return write_config(REQ_BRIGHTNESS_CONTRAST);
}

/*==========================================================================*/
/****/
/*//	YC filters*/

#if GFX_TV_DYNAMIC
int
fs450_get_yc_filter(unsigned int *p_yc_filter)
#else
int
gfx_get_yc_filter(unsigned int *p_yc_filter)
#endif
{
   if (!p_yc_filter)
      return ERR_INVALID_PARAMETER;

   if (houston_Rev() < HOUSTON_REV_B)
      return ERR_NOT_SUPPORTED;

   *p_yc_filter = d.yc_filter;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_yc_filter(unsigned int yc_filter)
#else
int
gfx_set_yc_filter(unsigned int yc_filter)
#endif
{
   if (houston_Rev() < HOUSTON_REV_B)
      return ERR_NOT_SUPPORTED;

   /*luma filter. */
   if (yc_filter & GFX_LUMA_FILTER)
      d.yc_filter |= GFX_LUMA_FILTER;
   else
      d.yc_filter &= ~GFX_LUMA_FILTER;

   /*chroma filter. */
   if (yc_filter & GFX_CHROMA_FILTER)
      d.yc_filter |= GFX_CHROMA_FILTER;
   else
      d.yc_filter &= ~GFX_CHROMA_FILTER;

   return write_config(REQ_YC_FILTER);
}

#if GFX_TV_DYNAMIC
int
fs450_get_aps_trigger_bits(unsigned int *p_trigger_bits)
#else
int
gfx_get_aps_trigger_bits(unsigned int *p_trigger_bits)
#endif
{
   if (!p_trigger_bits)
      return ERR_INVALID_PARAMETER;

   *p_trigger_bits = d.aps_trigger_bits;

   return 0;
}

#if GFX_TV_DYNAMIC
int
fs450_set_aps_trigger_bits(unsigned int trigger_bits)
#else
int
gfx_set_aps_trigger_bits(unsigned int trigger_bits)
#endif
{
   d.aps_trigger_bits = trigger_bits;

   return write_config(REQ_MACROVISION);
}

/*-----------------------------------------------------------------------------
 * gfx_set_tv_format
 *
 * This routine sets the TV encoder registers to the specified format
 * and resolution.
 * Currently only NTSC 640x480 is supported.
 *-----------------------------------------------------------------------------
 */
#if GFX_TV_DYNAMIC
int
fs450_set_tv_format(TVStandardType format, GfxOnTVType resolution)
#else
int
gfx_set_tv_format(TVStandardType format, GfxOnTVType resolution)
#endif
{
   /* ### ADD ### IMPLEMENTATION */
   return (0);
}

/*-----------------------------------------------------------------------------
 * gfx_set_tv_output
 *
 * This routine sets the TV encoder registers to the specified output type.
 * Supported output types are : S-VIDEO and Composite.
 *-----------------------------------------------------------------------------
 */
#if GFX_TV_DYNAMIC
int
fs450_set_tv_output(int output)
#else
int
gfx_set_tv_output(int output)
#endif
{
   /* ### ADD ### IMPLEMENTATION */
   return (0);
}

/*-----------------------------------------------------------------------------
 * gfx_set_tv_cc_enable
 *
 * This routine enables or disables the use of the hardware CC registers 
 * in the TV encoder.
 *-----------------------------------------------------------------------------
 */
#if GFX_TV_DYNAMIC
int
fs450_set_tv_cc_enable(int enable)
#else
int
gfx_set_tv_cc_enable(int enable)
#endif
{
   /* ### ADD ### IMPLEMENTATION */
   return (0);
}

/*-----------------------------------------------------------------------------
 * gfx_set_tv_cc_data
 *
 * This routine writes the two specified characters to the CC data register 
 * of the TV encoder.
 *-----------------------------------------------------------------------------
 */
#if GFX_TV_DYNAMIC
int
fs450_set_tv_cc_data(unsigned char data1, unsigned char data2)
#else
int
gfx_set_tv_cc_data(unsigned char data1, unsigned char data2)
#endif
{
   /* ### ADD ### IMPLEMENTATION */
   return (0);
}

#ifdef FS450_DIRECTREG

/*//==========================================================================*/
/****/
/*//	Direct Read and Write registers*/

int
FS450_ReadRegister(S_REG_INFO * p_reg)
{
   unsigned long tmp;

   if (PLAL_ReadRegister(p_reg))
      return 0;

   if (SOURCE_HOUSTON == p_reg->source) {
      switch (p_reg->size) {
      case 1:
      case 2:
	 {
	    houston_ReadReg((int)p_reg->offset, &tmp, (int)p_reg->size);
	    p_reg->value = tmp;
	 }
	 return 0;

      case 4:
	 {
	    houston_ReadReg((unsigned int)p_reg->offset, &tmp, 2);
	    p_reg->value = (tmp << 16);
	    houston_ReadReg((unsigned int)(p_reg->offset + 2), &tmp, 2);
	    p_reg->value |= tmp;
	 }
	 return 0;
      }
   }

   return ERR_INVALID_PARAMETER;
}

int
FS450_WriteRegister(S_REG_INFO * p_reg)
{
   if (PLAL_WriteRegister(p_reg))
      return 0;

   if (SOURCE_HOUSTON == p_reg->source) {
      houston_WriteReg((unsigned int)p_reg->offset, p_reg->value,
		       p_reg->size);

      return 0;
   }

   return ERR_INVALID_PARAMETER;
}

#endif

/****/
/*Houston initialization function.*/
/****/
static int g_houston_rev = -1;

static int
houston_init(void)
{
   /*//int errc; */
   unsigned long write, read;

   TRACE(("houston_init()\n"))

	 /*initialize I2C */
	 /*errc = I2C_init();
	  * if (errc)
	  * return errc;
	  */
	 /*Before we begin, we must enable power to the TFT */
	 read = READ_VID32(CS5530_DISPLAY_CONFIG);
   read |= CS5530_DCFG_FP_PWR_EN | CS5530_DCFG_FP_DATA_EN;
   WRITE_VID32(CS5530_DISPLAY_CONFIG, read);

   /*simple w/r test. */
   write = 0x0055;
   read = 0;

   houston_WriteReg(HOUSTON_IHO, write, 2);
   houston_ReadReg(HOUSTON_IHO, &read, 2);
   if (read != write) {
      houston_WriteReg(HOUSTON_IHO, write, 2);
      houston_ReadReg(HOUSTON_IHO, &read, 2);
      if (read != write) {
	 /*chip is not there, do something appropriate? */
	 TRACE(("wrote HOUSTON_IHO=0x0055, read 0x%04x\n", read))
	       return ERR_DEVICE_NOT_FOUND;
      }
   }

   /*read chip revision. */
   houston_ReadReg(HOUSTON_REV, &read, 2);
   g_houston_rev = (int)read;

   /*ok. */
   return 0;
}

static int
houston_Rev(void)
{
   return g_houston_rev;
}

static S_TIMING_SPECS g_specs;

static const S_TIMING_SPECS *
p_specs(void)
{
   return &g_specs;
}

/*//==========================================================================*/
/****/
/*FS450 configuration functions.*/
/****/
/*//==========================================================================*/
static int
config_init(void)
{
   int err;

   TRACE(("config_init()\n"))

	 err = houston_init();
   if (err)
      return err;

   return 0;
}

/*==========================================================================*/
/****/
/*convert word to encoder 10 bit value.*/

static unsigned short
w10bit2z(unsigned short w)
{
   return (w >> 2) | ((w & 0x03) << 8);
}

static unsigned short
z2w10bit(unsigned short z)
{
   return (0x03 & (z >> 8)) | ((0xFF & z) << 2);
}

/*==========================================================================*/
/****/
/*//	TV Standards*/

static const struct
{
   unsigned long standard;
   int tvsetup_index;
}
g_tv_standards[] =
{
   {
   GFX_TV_STANDARD_NTSC_M, 0}
   , {
   GFX_TV_STANDARD_NTSC_M_J, 2}
   , {
   GFX_TV_STANDARD_PAL_B, 1}
   , {
   GFX_TV_STANDARD_PAL_D, 1}
   , {
   GFX_TV_STANDARD_PAL_H, 1}
   , {
   GFX_TV_STANDARD_PAL_I, 1}
   , {
   GFX_TV_STANDARD_PAL_M, 3}
   , {
   GFX_TV_STANDARD_PAL_N, 4}
   , {
   GFX_TV_STANDARD_PAL_G, 1}
,};

static int
map_tvstd_to_index(unsigned long tv_std)
{
   unsigned int i;

   for (i = 0; i < sizeof(g_tv_standards) / sizeof(*g_tv_standards); i++) {
      if (tv_std == g_tv_standards[i].standard)
	 return g_tv_standards[i].tvsetup_index;
   }

   return -1;
}

static unsigned long
supported_standards(void)
{
   unsigned long standards = 0;
   unsigned int i;

   for (i = 0; i < sizeof(g_tv_standards) / sizeof(*g_tv_standards); i++) {
      if (g_tv_standards[i].tvsetup_index >= 0)
	 standards |= g_tv_standards[i].standard;
   }

   return standards;
}

/*==========================================================================*/

static void
config_power(int on)
{
   unsigned long reg;

   if (houston_Rev() < HOUSTON_REV_B) {
      /*no power down supported, but still turn of clock in off mode */
      if (on) {
	 houston_ReadReg(HOUSTON_CR, &reg, 2);
	 reg &= ~(CR_CLKOFF | CR_RESET);
	 houston_WriteReg(HOUSTON_CR, reg, 2);
	 reg |= CR_RESET;
	 houston_WriteReg(HOUSTON_CR, reg, 2);
	 reg &= ~CR_RESET;
	 houston_WriteReg(HOUSTON_CR, reg, 2);
      } else {
	 houston_ReadReg(HOUSTON_CR, &reg, 2);
	 reg |= CR_CLKOFF;
	 houston_WriteReg(HOUSTON_CR, reg, 2);
      }

      return;
   }

   if (on) {
      /*!CLKOFF, !COMPOFF, !YCOFF */
      /*and reset Houston */
      houston_ReadReg(HOUSTON_CR, &reg, 2);
      reg &= ~(CR_CLKOFF | CR_RESET | CR_COMPOFF | CR_YCOFF);
      houston_WriteReg(HOUSTON_CR, reg, 2);
      reg |= CR_RESET;
      houston_WriteReg(HOUSTON_CR, reg, 2);
      reg &= ~CR_RESET;
      houston_WriteReg(HOUSTON_CR, reg, 2);

      /*!GTLIO_PD */
      houston_ReadReg(HOUSTON_MISC, &reg, 2);
      reg &= ~MISC_GTLIO_PD;
      houston_WriteReg(HOUSTON_MISC, reg, 2);
   } else {
      /*CLKOFF, COMPOFF, YCOFF */
      houston_ReadReg(HOUSTON_CR, &reg, 2);
      reg |= (CR_CLKOFF | CR_COMPOFF | CR_YCOFF);
      houston_WriteReg(HOUSTON_CR, reg, 2);

      /*GTLIO_PD */
      houston_ReadReg(HOUSTON_MISC, &reg, 2);
      reg |= MISC_GTLIO_PD;
      houston_WriteReg(HOUSTON_MISC, reg, 2);
   }
}

/*==========================================================================*/
/****/
/*//	VGA mode*/

static void
config_vga_mode(unsigned long vga_mode)
{
   /*h_total must be evenly divisible by 32? */

   static struct
   {
      unsigned long mode;
      int width;
      int lines;
      int h_total;
   }
   vgaparams[] =
   {
      {
      GFX_VGA_MODE_640X480, 640, 480, 1056}
      , {
      GFX_VGA_MODE_720X487, 720, 487, 1056}
      , {
      GFX_VGA_MODE_720X576, 720, 576, 1056}
      , {
      GFX_VGA_MODE_800X600, 800, 600, 1056}
      , {
      GFX_VGA_MODE_1024X768, 1024, 768, 1344}
   ,};

   unsigned long cr, misc, byp;
   unsigned int i;

   g_specs.vga_width = 0;
   g_specs.vga_lines = 0;
   g_specs.h_total = 0;

   for (i = 0; i < sizeof(vgaparams) / sizeof(*vgaparams); i++) {
      if (vga_mode == vgaparams[i].mode) {
	 g_specs.vga_width = vgaparams[i].width;
	 g_specs.vga_lines = vgaparams[i].lines;
	 g_specs.h_total = vgaparams[i].h_total;
	 break;
      }
   }
   if (!g_specs.h_total)
      return;

   /*clock mux decimator and vga dual. */
   houston_ReadReg(HOUSTON_CR, &cr, 2);
   houston_ReadReg(HOUSTON_MISC, &misc, 2);
   houston_ReadReg(HOUSTON_BYP, &byp, 2);

   if (vga_mode == GFX_VGA_MODE_1024X768) {
       /*XGA*/ cr |= CR_UIM_DEC;
      misc |= MISC_VGACKDIV;
      byp |= (BYP_HDS_BYPASS | BYP_CAC_BYPASS);
   } else {
      /*VGA,SVGA */
      cr &= ~CR_UIM_DEC;
      misc &= ~MISC_VGACKDIV;
      byp &= ~(BYP_HDS_BYPASS | BYP_CAC_BYPASS);
   }

   houston_WriteReg(HOUSTON_CR, cr, 2);
   houston_WriteReg(HOUSTON_MISC, misc, 2);
   houston_WriteReg(HOUSTON_BYP, byp, 2);
}

/*==========================================================================*/
/****/
/*//	Write settings for TV standard to device*/

static void
config_tv_std(unsigned long tv_std, unsigned int trigger_bits)
{
   int k;
   unsigned short reg34;
   unsigned long cr, w;
   unsigned long l;

   /*verify supported standard. */
   k = map_tvstd_to_index(tv_std);
   if (k < 0)
      return;

   /*store tv width and lines */
   g_specs.tv_width = tvsetup.tv_width[k];
   g_specs.tv_lines = tvsetup.tv_lines[k];

   /*houston CR register. */
   houston_ReadReg(HOUSTON_CR, &cr, 2);
   cr &= ~CR_656_PAL_NTSC;
   cr |= tvsetup.houston_cr[k];
   houston_WriteReg(HOUSTON_CR, cr, 2);

   /*setup the encoder. */
   l = tvsetup.chroma_freq[k];
   houston_WriteReg(ENC_CHROMA_FREQ, (int)(l & 0x00ff), 1);
   houston_WriteReg(ENC_CHROMA_FREQ + 1, (int)((l >> 8) & 0x00ff), 1);
   houston_WriteReg(ENC_CHROMA_FREQ + 2, (int)((l >> 16) & 0x00ff), 1);
   houston_WriteReg(ENC_CHROMA_FREQ + 3, (int)((l >> 24) & 0x00ff), 1);

   houston_WriteReg(ENC_CHROMA_PHASE, tvsetup.chroma_phase[k], 1);
   houston_WriteReg(ENC_REG05, 0x00, 1);	/*reg 0x05 */
   houston_WriteReg(ENC_REG06, 0x89, 1);	/*reg 0x06 */
   houston_WriteReg(ENC_REG07, 0x00, 1);	/*reg 0x07 */
   houston_WriteReg(ENC_HSYNC_WIDTH, tvsetup.hsync_width[k], 1);
   houston_WriteReg(ENC_BURST_WIDTH, tvsetup.burst_width[k], 1);
   houston_WriteReg(ENC_BACK_PORCH, tvsetup.back_porch[k], 1);
   houston_WriteReg(ENC_CB_BURST_LEVEL, tvsetup.cb_burst_level[k], 1);
   houston_WriteReg(ENC_CR_BURST_LEVEL, tvsetup.cr_burst_level[k], 1);
   houston_WriteReg(ENC_SLAVE_MODE, 0x01, 1);	/*slave mode */
   if (trigger_bits == 0)
      w = w10bit2z(tvsetup.blank_level[k]);	/*blank level */
   else
      w = w10bit2z((unsigned short)(tvsetup.blank_level[k] -
				    tvsetup.hamp_offset[k]));
   houston_WriteReg(ENC_BLANK_LEVEL, w & 0x00ff, 1);
   houston_WriteReg(ENC_BLANK_LEVEL + 1, w >> 8, 1);
   w = w10bit2z(tvsetup.tv_lines[k]);	/*num_lines */
   houston_WriteReg(ENC_NUM_LINES, w & 0x00ff, 1);
   houston_WriteReg(ENC_NUM_LINES + 1, w >> 8, 1);

   houston_WriteReg(ENC_TINT, 0x00, 1);	/*tint */
   houston_WriteReg(ENC_BREEZE_WAY, tvsetup.breeze_way[k], 1);
   houston_WriteReg(ENC_FRONT_PORCH, tvsetup.front_porch[k], 1);
   houston_WriteReg(ENC_ACTIVELINE, tvsetup.activeline[k], 1);
   houston_WriteReg(ENC_FIRST_LINE, 0x15, 1);	/*firstvideoline */
   reg34 =
	 0x80 |
	 (tvsetup.pal_mode[k] << 6) |
	 (tvsetup.sys625_50[k] << 3) |
	 (tvsetup.cphase_rst[k] << 1) | (tvsetup.vsync5[k]);
   houston_WriteReg(ENC_REG34, reg34, 1);	/*reg 0x34 */
   houston_WriteReg(ENC_SYNC_LEVEL, tvsetup.sync_level[k], 1);
   if (trigger_bits == 0)
      w = w10bit2z(tvsetup.vbi_blank_level[k]);	/*blank level */
   else
      w = w10bit2z((unsigned short)(tvsetup.vbi_blank_level[k] - 1));
   houston_WriteReg(ENC_VBI_BLANK_LEVEL, w & 0x00ff, 1);
   houston_WriteReg(ENC_VBI_BLANK_LEVEL + 1, w >> 8, 1);
}

static void
conget_tv_std(unsigned long *p_tv_standard)
{
   unsigned long cr;

   if (!p_tv_standard)
      return;

   /*just pick between NTSC and PAL */
   houston_ReadReg(HOUSTON_CR, &cr, 2);
   if (CR_656_PAL_NTSC & cr)
      *p_tv_standard = GFX_TV_STANDARD_PAL_B;
   else
      *p_tv_standard = GFX_TV_STANDARD_NTSC_M;
}

/*==========================================================================*/
/****/
/*//	TVout mode*/

static void
config_tvout_mode(unsigned long tvout_mode)
{
   unsigned long cr;

   houston_ReadReg(HOUSTON_CR, &cr, 2);

   /*all dacs off */
   cr |= (CR_COMPOFF | CR_YCOFF);
   /*not rgb */
   cr &= ~CR_OFMT;

   /*turn on requested output */
   if (GFX_TVOUT_MODE_CVBS & tvout_mode)
      cr &= ~CR_COMPOFF;
   if (GFX_TVOUT_MODE_YC & tvout_mode)
      cr &= ~CR_YCOFF;
   if (GFX_TVOUT_MODE_RGB & tvout_mode) {
      cr &= ~(CR_COMPOFF | CR_YCOFF);
      cr |= CR_OFMT;
   }

   houston_WriteReg(HOUSTON_CR, cr, 2);
}

static void
conget_tvout_mode(unsigned long *p_tvout_mode)
{
   unsigned long cr;

   if (!p_tvout_mode)
      return;

   houston_ReadReg(HOUSTON_CR, &cr, 2);

   if (CR_OFMT & cr)
      *p_tvout_mode = GFX_TVOUT_MODE_RGB;
   else {
      *p_tvout_mode = 0;
      if (!(CR_YCOFF & cr))
	 *p_tvout_mode |= GFX_TVOUT_MODE_YC;
      if (!(CR_COMPOFF & cr))
	 *p_tvout_mode |= GFX_TVOUT_MODE_CVBS;
   }
}

/*==========================================================================*/
/****/
/*//	Size & Position*/

#define IS_NTSC(tv_std) (tv_std & ( \
	GFX_TV_STANDARD_NTSC_M |   \
	GFX_TV_STANDARD_NTSC_M_J | \
	GFX_TV_STANDARD_PAL_M))
#define IS_PAL(tv_std) (tv_std & ( \
	GFX_TV_STANDARD_PAL_B | \
	GFX_TV_STANDARD_PAL_D | \
	GFX_TV_STANDARD_PAL_H | \
	GFX_TV_STANDARD_PAL_I | \
	GFX_TV_STANDARD_PAL_N | \
	GFX_TV_STANDARD_PAL_G))

/*return fifo delay setting for mode, std, and total lines.*/

static void
get_ffolat_ivo(unsigned long vga_mode,
	       unsigned long tv_std,
	       long i, unsigned short *ffolat, unsigned short *ivo)
{
   switch (vga_mode) {
   case GFX_VGA_MODE_640X480:
      if (IS_NTSC(tv_std)) {
	 if (i > SIZE6X4NTSC - 1)
	    i = SIZE6X4NTSC - 1;
	 *ffolat = ffo6x4ntsc[i].ffolat;
	 *ivo = 0x20;
      } else {
	 if (i > SIZE6X4PAL - 1)
	    i = SIZE6X4PAL - 1;
	 *ffolat = ffo6x4pal[i].ffolat;
	 *ivo = 0x28;
      }
      break;

   case GFX_VGA_MODE_800X600:
      if (IS_NTSC(tv_std)) {
	 if (i > SIZE8X6NTSC - 1)
	    i = SIZE8X6NTSC - 1;
	 *ffolat = ffo8x6ntsc[i].ffolat;
	 *ivo = 0x3a;
      } else {
	 if (i > SIZE8X6PAL - 1)
	    i = SIZE8X6PAL - 1;
	 *ffolat = ffo8x6pal[i].ffolat;
	 *ivo = 0x39;
      }
      break;

   case GFX_VGA_MODE_720X487:
      *ffolat = 0x40;			/*//FFO7x4; */
      *ivo = 0x1a;
      break;

   case GFX_VGA_MODE_720X576:
      *ffolat = 0x40;			/*//FFO7x5; */
      *ivo = 0x1a;
      break;

   case GFX_VGA_MODE_1024X768:
   default:
      if (IS_NTSC(tv_std)) {
	 if (i > SIZE10X7NTSC - 1)
	    i = SIZE10X7NTSC - 1;
	 *ffolat = ffo10x7ntsc[i].ffolat;
	 *ivo = ffo10x7ntsc[i].ivo;
      } else {
	 if (i > SIZE10X7PAL - 1)
	    i = SIZE10X7PAL - 1;
	 *ffolat = ffo10x7pal[i].ffolat;
	 *ivo = ffo10x7pal[i].ivo;
      }
      break;
   }
}

/*get vertical line min and max for mode and std.*/

static void
get_vtotal_min_max(unsigned long vga_mode,
		   unsigned long tv_std,
		   int *v_total_min, int *v_total_max, int *v_step)
{
   int k = map_tvstd_to_index(tv_std);

   switch (vga_mode) {
   case GFX_VGA_MODE_640X480:
      if (IS_NTSC(tv_std)) {
	 *v_total_min = ffo6x4ntsc[0].v_total;
	 *v_total_max = ffo6x4ntsc[SIZE6X4NTSC - 1].v_total;
      } else {
	 *v_total_min = ffo6x4pal[0].v_total;
	 *v_total_max = ffo6x4pal[SIZE6X4PAL - 1].v_total;
      }
      *v_step = 4;
      break;

   case GFX_VGA_MODE_800X600:
      if (IS_NTSC(tv_std)) {
	 *v_total_min = ffo8x6ntsc[0].v_total;
	 *v_total_max = ffo8x6ntsc[SIZE8X6NTSC - 1].v_total;
      } else {
	 *v_total_min = ffo8x6pal[0].v_total;
	 *v_total_max = ffo8x6pal[SIZE8X6PAL - 1].v_total;
      }
      *v_step = 5;
      break;

   case GFX_VGA_MODE_720X487:
   case GFX_VGA_MODE_720X576:
      *v_total_min = tvsetup.tv_lines[k];
      *v_total_max = tvsetup.tv_lines[k];
      *v_step = 4;
      break;

   case GFX_VGA_MODE_1024X768:
      if (IS_NTSC(tv_std)) {
	 *v_total_min = ffo10x7ntsc[0].v_total;
	 *v_total_max = ffo10x7ntsc[SIZE10X7NTSC - 1].v_total;
      } else {
	 *v_total_min = ffo10x7pal[0].v_total;
	 *v_total_max = ffo10x7pal[SIZE10X7PAL - 1].v_total;
      }
      *v_step = 6;
      break;
   }
}

static void
config_overscan_xy(unsigned long tv_std,
		   unsigned long vga_mode,
		   int overscan_x, int overscan_y, int pos_x, int pos_y)
{
   unsigned int vga_index;
   unsigned long reg;
   double vsc;
   int k;
   unsigned short ffolat, ivo;
   int base_v_total, range, v_offset;
   int v_total_min, v_total_max, v_step;
   float r, f;
   int vga_pixels, pre_pixels;
   float hscale, hscale_min, hscale_max;
   int hsc;
   int iho, iho_max, ihw;

   /*tv_std is valid. */
   k = map_tvstd_to_index(tv_std);

   /*store tv width and lines */
   g_specs.tv_width = tvsetup.tv_width[k];
   g_specs.tv_lines = tvsetup.tv_lines[k];

   /*determine vga mode index */
   for (vga_index = 0; vga_index < SCANTABLE_ENTRIES; vga_index++) {
      if (scantable[vga_index].mode == vga_mode)
	 break;
   }
   if (vga_index >= SCANTABLE_ENTRIES)
      return;

	/****/
   /*vertical scaling (v_total setup). */
	/****/
   /*calculate vertical range. */
   get_vtotal_min_max(vga_mode, tv_std, &v_total_min, &v_total_max, &v_step);
   TRACE(("v_total min=%d, max=%d\n", v_total_min, v_total_max))
	 base_v_total = scantable[vga_index].v_total[k];
   range = fsmax(base_v_total - v_total_min, v_total_max - base_v_total);
   TRACE(("v_total range = %d\n", range))

	 /*map +/-1000 overscan y into +/-range. */
	 v_offset = (int)((((float)overscan_y * range) / 1000.f) + .5f);
   TRACE(("v_offset = %d\n", v_offset))

	 /*range limit v_total. */
	 g_specs.v_total =
	 range_limit(base_v_total + v_offset, v_total_min, v_total_max);

   /*round to calibrated value. */
   v_offset = (g_specs.v_total - v_total_min + (v_step / 2)) / v_step;
   g_specs.v_total = v_total_min + v_offset * v_step;
   TRACE(("desired v_total=%d\n", g_specs.v_total))

	/****/
	 /*vertical positioning (vsync setup). */
	/****/
	 get_ffolat_ivo(vga_mode, tv_std, v_offset, &ffolat, &ivo);
   houston_WriteReg(HOUSTON_IVO, ivo, 2);

   /*scale base sync offset by scaling ratio. */
   r = (float)g_specs.v_total / (float)base_v_total;
   v_offset = (int)(r * (float)scantable[vga_index].v_sync[k]);

   /*scale ivo. */
   f = (float)ivo;
   v_offset -= (int)(f - f / r);

   /*compensate for center screen. */
   f = (float)tvsetup.tv_active_lines[k] / 2.f;
   v_offset += (int)(f * r - f);

   /*calculate vsync. */
   g_specs.v_sync = g_specs.v_total - v_offset + pos_y;
   TRACE(("desired v_total=%d, desired v_sync=%d\n", g_specs.v_total,
	  g_specs.v_sync))
	 if (g_specs.v_sync < g_specs.vga_lines + 10) {
      TRACE(("vsync too low\n"))
	    /*//d.v_total += d.vga_lines+10-d.v_sync; */
	    g_specs.v_sync = g_specs.vga_lines + 10;
   } else if (g_specs.v_sync > g_specs.v_total - 10) {
      TRACE(("vsync too high\n"))
	    g_specs.v_sync = g_specs.v_total - 10;
   }
   TRACE(("v_total=%d v_sync=%d\n", g_specs.v_total, g_specs.v_sync))

	 /*FFOLAT. */
	 houston_WriteReg(HOUSTON_FFO_LAT, ffolat, 2);

   /*VSC. */
   vsc = (65536.0f *
	  (1.0f - (double)g_specs.tv_lines / (double)g_specs.v_total)) + 0.5f;
   reg = ((unsigned long)-vsc) & 0xffff;
   TRACE(("vsc=%04x, tv_lines=%d, v_total=%d\n", reg, g_specs.tv_lines,
	  g_specs.v_total))
	 houston_WriteReg(HOUSTON_VSC, (int)reg, 2);

	/****/
   /*horizontal scaling. */
	/****/

   /*vga pixels is vga width, except in 1024x768, where it's half that. */
   vga_pixels = g_specs.vga_width;
   if (1024 == vga_pixels)
      vga_pixels /= 2;

   /*maximum scaling coefficient is tv_width / vga_pixels */
   /*minimum is about 1/2, but that is quite small.  arbitrarily set minimum at 75% maximum. */
   hscale_max = (720.0f / vga_pixels);
   hscale_min = fsmax((0.75f * hscale_max), (1.0f - (63.0f / 128.0f)));
   TRACE(("hscale_min = %u.%u, hscale_max = %u.%u\n",
	  (int)hscale_min,
	  (int)((hscale_min - (int)hscale_min) * 1000),
	  (int)hscale_max, (int)((hscale_max - (int)hscale_max) * 1000)))

	 /*map overscan_x into min to max. */
	 hscale =
	 hscale_min + ((overscan_x + 1000.0f) / 2000.0f) * (hscale_max -
							    hscale_min);
   TRACE(("hscale = %u.%u\n", (int)hscale,
	  (int)((hscale - (int)hscale) * 1000)))

	 /*determine hsc where hscale = (1 + hsc/128) */
	 if (hscale >= 1.0f)
      hsc = (int)(128.f * (hscale - 1.0f) + .5f);
   else
      hsc = (int)(128.f * (hscale - 1.0f) - .5f);
   TRACE(("hsc = %d\n", hsc))
	 if (hsc >= 0)
      houston_WriteReg(HOUSTON_HSC, hsc << 8, 2);
   else
      houston_WriteReg(HOUSTON_HSC, hsc & 0xFF, 2);

   /*recalculate hscale for future formulas */
   hscale = 1.0f + (hsc / 128.0f);
   TRACE(("recalculated hscale = %u.%u\n", (int)hscale,
	  (int)((hscale - (int)hscale) * 1000)))

	/****/
	 /*horizontal offset. */
	/****/
	 /*place hsync 40 before halfway from vga_width to htotal */
	 /*but not less than vga_width + 10 */
	 g_specs.h_sync =
	 fsmax((g_specs.h_total + g_specs.vga_width) / 2 - 40,
	       g_specs.vga_width + 10);
   /*also, make it even */
   g_specs.h_sync &= ~1;
   TRACE(("hsync = %u\n", g_specs.h_sync))

	 /*iho range is 0 to iho_max. */
	 /*iho_max is 2 * iho_center. */
	 /*iho_center is pre_pixels - (tvwidth / hscale - vga pixels) / 2. */
	 /*pre_pixels = (htotal - hsync) * (vga_pixels / vga_width) */
	 /*note that the range is inverted also, because it specifies the number of pixels */
	 /*to skip, or subtract.  iho=0 maps to farthest right. */
	 /*map -pos_x = +/-1000 into (0 to iho_max) */
	 pre_pixels =
	 (int)((long)(g_specs.h_total - g_specs.h_sync) * vga_pixels /
	       g_specs.vga_width);
   iho_max = (2 * pre_pixels) - ((int)(720.0f / hscale + 0.5f) - vga_pixels);
   TRACE(("iho_max = %u\n", iho_max))
	 iho =
	 (int)range_limit(((long)(1000 - pos_x) * iho_max / 2000) +
			  scantable[vga_index].iho[k], 0, iho_max);
   TRACE(("iho = %u\n", iho))
	 houston_WriteReg(HOUSTON_IHO, iho, 2);

	/****/
   /*input horizontal width. */
	/****/

   /*input horizontal width is vga pixels + pre_pixels - iho */
   /*additionally, ihw cannot exceed tv width / hscale */
   /*and if hsc is negative, (ihw)(-hsc/128) cannot exceed ~250. */
   /*and ihw should be even. */
   ihw = fsmin(vga_pixels + pre_pixels - iho, (int)(720.0f / hscale));
   if (hsc < 0)
      ihw = (int)fsmin(ihw, 253L * 128 / (-hsc));
   ihw &= ~1;
   TRACE(("ihw = %u\n", ihw))
	 houston_WriteReg(HOUSTON_IHA, ihw, 2);

   f = (((float)g_specs.h_total * g_specs.v_total) * 27.f) /
	 ((float)g_specs.tv_width * g_specs.tv_lines);

   TRACE(("freq=%u.%uMHz\n", (int)f, (int)((f - (int)f) * 1000)))
}

/*==========================================================================*/
/****/
/*configure houston nco.*/

static void
config_nco(unsigned long tv_std, unsigned long vga_mode)
{
   unsigned long cr, misc;
   unsigned long reg;
   int k = map_tvstd_to_index(tv_std);

   /*read and store CR. */
   houston_ReadReg(HOUSTON_CR, &cr, 2);

   /*make sure NCO_EN (enable latch) bit is clear */
   cr &= ~CR_NCO_EN;
   houston_WriteReg(HOUSTON_CR, cr, 2);

   /*clear NCO_LOADX. */
   houston_ReadReg(HOUSTON_MISC, &misc, 2);
   misc &= ~(MISC_NCO_LOAD1 + MISC_NCO_LOAD0);
   houston_WriteReg(HOUSTON_MISC, misc, 2);

   if (vga_mode == GFX_VGA_MODE_1024X768) {
      /*setup for M and N load (Nco_load=1). */
      misc |= (MISC_NCO_LOAD0);
      houston_WriteReg(HOUSTON_MISC, misc, 2);

      /*M and N. */
      houston_WriteReg(HOUSTON_NCONL, 1024 - 2, 2);
      houston_WriteReg(HOUSTON_NCODL, 128 - 1, 2);

      /*latch M/N in. */
      cr |= CR_NCO_EN;
      houston_WriteReg(HOUSTON_CR, cr, 2);
      cr &= ~CR_NCO_EN;
      houston_WriteReg(HOUSTON_CR, cr, 2);

      /*setup ncon and ncod load (Nco_load=0). */
      misc &= ~(MISC_NCO_LOAD1 + MISC_NCO_LOAD0);
      houston_WriteReg(HOUSTON_MISC, misc, 2);

      /*NCON. */
      reg = ((unsigned long)g_specs.v_total * g_specs.h_total) / 2;
      houston_WriteReg(HOUSTON_NCONH, reg >> 16, 2);
      houston_WriteReg(HOUSTON_NCONL, reg & 0xffff, 2);

      /*NCOD. */
      houston_WriteReg(HOUSTON_NCODL, tvsetup.houston_ncodl[k], 2);
      houston_WriteReg(HOUSTON_NCODH, tvsetup.houston_ncodh[k], 2);
   } else {
      /*setup for M and N load (Nco_load=2). */
      misc |= (MISC_NCO_LOAD1);
      houston_WriteReg(HOUSTON_MISC, misc, 2);

      /*NCON. */
      reg = (unsigned long)g_specs.v_total * g_specs.h_total;
      houston_WriteReg(HOUSTON_NCONH, reg >> 16, 2);
      houston_WriteReg(HOUSTON_NCONL, reg & 0xffff, 2);

      /*NCOD. */
      houston_WriteReg(HOUSTON_NCODL, tvsetup.houston_ncodl[k], 2);
      houston_WriteReg(HOUSTON_NCODH, tvsetup.houston_ncodh[k], 2);

      TRACE(("NCON = %lu (0x%08lx), NCOD = %lu (0x%08lx)\n",
	     reg,
	     reg,
	     ((unsigned long)tvsetup.houston_ncodh[k] << 16) +
	     tvsetup.houston_ncodl[k],
	     ((unsigned long)tvsetup.houston_ncodh[k] << 16) +
	     tvsetup.houston_ncodl[k]))
   }

   /*latch M/N and NCON/NCOD in. */
   cr |= CR_NCO_EN;
   houston_WriteReg(HOUSTON_CR, cr, 2);
   cr &= ~CR_NCO_EN;
   houston_WriteReg(HOUSTON_CR, cr, 2);
}

/*==========================================================================*/
/****/
/*//	Write sharpness settings to device*/

static void
config_sharpness(int sharpness)
{
   unsigned int shp;

   /*map 0-1000 to 0-20. */
   shp = (unsigned int)(0.5f + ((float)sharpness * 20.0f / 1000.0f));
   shp = range_limit(shp, 0, 20);

   houston_WriteReg(HOUSTON_SHP, shp, 2);
}

static void
conget_sharpness(int *p_sharpness)
{
   unsigned long shp;

   if (!p_sharpness)
      return;

   houston_ReadReg(HOUSTON_SHP, &shp, 2);

   /*map 0-20 to 0-1000. */
   *p_sharpness = (int)(0.5f + ((float)shp * 1000.0f / 20.0f));
}

/*==========================================================================*/
/****/
/*//	Write flicker settings to device*/

static void
config_flicker(int flicker)
{
   unsigned int flk;

   /*map 0-1000 to 0-16. */
   flk = (unsigned int)(0.5f + ((float)flicker * 16.0f / 1000.0f));
   flk = range_limit(flk, 0, 16);

   houston_WriteReg(HOUSTON_FLK, flk, 2);
}

static void
conget_flicker(int *p_flicker)
{
   unsigned long flk;

   if (!p_flicker)
      return;

   houston_ReadReg(HOUSTON_FLK, &flk, 2);

   /*map 0-16 to 0-1000. */
   *p_flicker = (int)(0.5f + ((float)flk * 1000.0f / 16.0f));
}

/*==========================================================================*/
/****/
/*//	Write color settings to device*/

static void
config_color(int color)
{
   unsigned long clr;

   /*map 0-100 to 0-255. */
   /*montreal production test needs 169 to be mappable, so */
   /*use .8 rounding factor, 169=(int)(66.*2.55+.8). */
   clr = (unsigned long)(0.8f + ((float)color * 255.0f / 100.0f));
   clr = range_limit(clr, 0, 255);

   houston_WriteReg(ENC_CR_GAIN, clr, 1);
   houston_WriteReg(ENC_CB_GAIN, clr, 1);
}

static void
conget_color(int *p_color)
{
   unsigned long cr_gain;

   if (!p_color)
      return;

   /*just get CR GAIN, CB GAIN should match. */
   houston_ReadReg(ENC_CR_GAIN, &cr_gain, 1);

   /*map 0-255 to 0-100. */
   *p_color = (int)(0.5f + ((float)cr_gain * 100.0f / 255.0f));
}

/*==========================================================================*/
/****/
/*//	Write brightness and contrast settings to device*/

#define	NTSC_BLANK_LEVEL	240

static const int min_black_level = NTSC_BLANK_LEVEL + 1;
static const int max_white_level = 1023;

static void
config_brightness_contrast(unsigned long tv_std, unsigned int trigger_bits,
			   int brightness, int contrast)
{
   int brightness_off;
   float contrast_mult;
   int black, white;
   unsigned short w;
   int k = map_tvstd_to_index(tv_std);

   /*0-100 maps to +/-220. */
   brightness_off = (int)(0.5f + ((float)brightness * 440.0f / 100.0f)) - 220;

   /*0-100 maps to .75-1.25. */
   contrast_mult = ((float)contrast * 0.5f / 100.0f) + 0.75f;

   black = tvsetup.black_level[k];
   if (trigger_bits != 0)
      black -= tvsetup.hamp_offset[k];

   white = tvsetup.white_level[k];
   if (trigger_bits != 0)
      white -= tvsetup.hamp_offset[k];

   black = (int)((float)(black + brightness_off) * contrast_mult);
   white = (int)((float)(white + brightness_off) * contrast_mult);
   if (black < min_black_level)
      black = min_black_level;
   if (white > max_white_level)
      white = max_white_level;

   w = w10bit2z((unsigned short)black);
   houston_WriteReg(ENC_BLACK_LEVEL, w & 0x00ff, 1);
   houston_WriteReg(ENC_BLACK_LEVEL + 1, w >> 8, 1);
   w = w10bit2z((unsigned short)white);
   houston_WriteReg(ENC_WHITE_LEVEL, w & 0x00ff, 1);
   houston_WriteReg(ENC_WHITE_LEVEL + 1, w >> 8, 1);
}

static void
conget_brightness_contrast(unsigned long tv_std, unsigned int trigger_bits,
			   int *p_brightness, int *p_contrast)
{
   int brightness_off;
   float contrast_mult;
   unsigned short black, white;
   unsigned long zh, zl;
   int k;

   if (!p_brightness || !p_contrast)
      return;

   k = map_tvstd_to_index(tv_std);

   houston_ReadReg(ENC_BLACK_LEVEL, &zl, 1);
   houston_ReadReg(ENC_BLACK_LEVEL + 1, &zh, 1);
   black = z2w10bit((unsigned short)(zl + (zh << 8)));
   if (trigger_bits != 0)
      black += tvsetup.hamp_offset[k];
   houston_ReadReg(ENC_WHITE_LEVEL, &zl, 1);
   houston_ReadReg(ENC_WHITE_LEVEL + 1, &zh, 1);
   white = z2w10bit((unsigned short)(zl + (zh << 8)));
   if (trigger_bits != 0)
      white += tvsetup.hamp_offset[k];

   /*this reverse computation does not account for clipping, but should */
   /*provide somewhat reasonable numbers */
   contrast_mult =
	 ((float)white - (float)black) / ((float)tvsetup.white_level[k] -
					  (float)tvsetup.black_level[k]);
   brightness_off =
	 (int)(((float)black / contrast_mult) - tvsetup.black_level[k]);

   /*+/-220 maps to 0-100. */
   *p_brightness =
	 range_limit((int)
		     (0.5f +
		      ((float)(brightness_off + 220) * 100.0f / 440.0f)), 0,
		     100);

   /*.75-1.25 maps to 0-100. */
   *p_contrast =
	 range_limit((int)
		     (0.5f +
		      ((float)(contrast_mult - 0.75f) * 100.0f / 0.5f)), 0,
		     100);
}

/*==========================================================================*/
/****/
/*configure luma/chroma filters.*/

static void
config_yc_filter(unsigned long tv_std, int luma_filter, int chroma_filter)
{
   unsigned long reg, reg07, reg34;

   if (houston_Rev() < HOUSTON_REV_B)
      return;

   /*luma filter. */
   if (luma_filter)
      reg = tvsetup.notch_filter[map_tvstd_to_index(tv_std)];
   else
      reg = 0;
   houston_WriteReg(ENC_NOTCH_FILTER, reg, 1);

   /*chroma filter. */
   houston_ReadReg(ENC_REG07, &reg07, 1);
   houston_ReadReg(ENC_REG34, &reg34, 1);
   if (chroma_filter) {
      reg07 &= ~0x08;
      reg34 &= ~0x20;
   } else {
      reg07 |= 0x08;
      reg34 |= 0x20;
   }
   houston_WriteReg(ENC_REG07, reg07, 1);
   houston_WriteReg(ENC_REG34, reg34, 1);
}

static void
conget_yc_filter(int *p_luma_filter, int *p_chroma_filter)
{
   unsigned long reg, reg07, reg34;

   if (!p_luma_filter || !p_chroma_filter)
      return;

   if (houston_Rev() < HOUSTON_REV_B) {
      *p_luma_filter = 0;
      *p_chroma_filter = 0;
      return;
   }

   /*luma filter. */
   houston_ReadReg(ENC_NOTCH_FILTER, &reg, 1);
   *p_luma_filter = (reg ? 1 : 0);

   /*chroma filter. */
   houston_ReadReg(ENC_REG07, &reg07, 1);
   houston_ReadReg(ENC_REG34, &reg34, 1);
   *p_chroma_filter = !((0x08 & reg07) || (0x20 & reg34));
}

/*==========================================================================*/
/****/
/*//	Macrovision*/

static void
config_macrovision(unsigned long tv_std, unsigned int trigger_bits)
{
/****/
/*Constants to index into mvsetup columns.*/
/****/
#define	nNTSC_APS00		0	/*ntsc mv off. */
#define	nNTSC_APS01		1	/*ntsc AGC only. */
#define	nNTSC_APS10		2	/*ntsc AGC + 2-line CS. */
#define	nNTSC_APS11		3	/*ntsc AGC + 4-line CS. */
#define	nPAL_APS00		4	/*pal mv off. */
#define	nPAL_APSXX		5	/*pal mv on. */
#define	nMVModes		6

/****/
/*Macrovision setup table.*/
/****/
   static const struct mvparms
   {
      unsigned short n0[nMVModes];
      unsigned short n1[nMVModes];
      unsigned short n2[nMVModes];
      unsigned short n3[nMVModes];
      unsigned short n4[nMVModes];
      unsigned short n5[nMVModes];
      unsigned short n6[nMVModes];
      unsigned short n7[nMVModes];
      unsigned short n8[nMVModes];
      unsigned short n9[nMVModes];
      unsigned short n10[nMVModes];
      unsigned short n11[nMVModes];
      unsigned short n12[nMVModes];
      unsigned short n13[nMVModes];
      unsigned short n14[nMVModes];
      unsigned short n15[nMVModes];
      unsigned short n16[nMVModes];
      unsigned short n17[nMVModes];
      unsigned short n18[nMVModes];
      unsigned short n19[nMVModes];
      unsigned short n20[nMVModes];
      unsigned short n21[nMVModes];
      unsigned short n22[nMVModes];
      unsigned short agc_pulse_level[nMVModes];
      unsigned short bp_pulse_level[nMVModes];
   }

   mvsetup =
   {					/*//    ntsc    ntsc    ntsc    ntsc    pal             pal */
      /*//    MV              AGC             AGC +   AGC +   MV              MV */
      /*//    off.    only    2-line  4-line  off.    on. */
      /*//                                    CS.             CS. */
      {
      0x00, 0x36, 0x3e, 0x3e, 0x00, 0x3e}
      ,					/*n0 */
      {
      0x1d, 0x1d, 0x1d, 0x17, 0x1a, 0x1a}
      ,					/*n1 */
      {
      0x11, 0x11, 0x11, 0x15, 0x22, 0x22}
      ,					/*n2 */
      {
      0x25, 0x25, 0x25, 0x21, 0x2a, 0x2a}
      ,					/*n3 */
      {
      0x11, 0x11, 0x11, 0x15, 0x22, 0x22}
      ,					/*n4 */
      {
      0x01, 0x01, 0x01, 0x05, 0x05, 0x05}
      ,					/*n5 */
      {
      0x07, 0x07, 0x07, 0x05, 0x02, 0x02}
      ,					/*n6 */
      {
      0x00, 0x00, 0x00, 0x02, 0x00, 0x00}
      ,					/*n7 */
      {
      0x1b, 0x1b, 0x1b, 0x1b, 0x1c, 0x1c}
      ,					/*n8 */
      {
      0x1b, 0x1b, 0x1b, 0x1b, 0x3d, 0x3d}
      ,					/*n9 */
      {
      0x24, 0x24, 0x24, 0x24, 0x14, 0x14}
      ,					/*n10 */
      {
      0x780f, 0x780f, 0x780f, 0x780f, 0x7e07, 0x7e07}
      ,					/*n11 */
      {
      0x0000, 0x0000, 0x0000, 0x0000, 0x5402, 0x5402}
      ,					/*n12 */
      {
      0x0f, 0x0f, 0x0f, 0x0f, 0xfe, 0xfe}
      ,					/*n13 */
      {
      0x0f, 0x0f, 0x0f, 0x0f, 0x7e, 0x7e}
      ,					/*n14 */
      {
      0x60, 0x60, 0x60, 0x60, 0x60, 0x60}
      ,					/*n15 */
      {
      0x01, 0x01, 0x01, 0x01, 0x00, 0x00}
      ,					/*n16 */
      {
      0x0a, 0x0a, 0x0a, 0x0a, 0x08, 0x08}
      ,					/*n17 */
      {
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
      ,					/*n18 */
      {
      0x05, 0x05, 0x05, 0x05, 0x04, 0x04}
      ,					/*n19 */
      {
      0x04, 0x04, 0x04, 0x04, 0x07, 0x07}
      ,					/*n20 */
      {
      0x03ff, 0x03ff, 0x03ff, 0x03ff, 0x0155, 0x0155}
      ,					/*n21 */
      {
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00}
      ,					/*n22 */
      {
      0xa3, 0xa3, 0xa3, 0xa3, 0xa3, 0xa3}
      ,					/*agc_pulse_level */
      {
      0xc8, 0xc8, 0xc8, 0xc8, 0xc8, 0xc8}
      ,					/*bp_pulse_level */
   };

   int nMode;
   unsigned long misc;
   unsigned short n0;

   trigger_bits &= 0x3;

   /*Determine the OEM Macrovision Program Mode and Register 0 Data. */
   if (IS_NTSC(tv_std)) {
      /*NTSC TV Standard. */
      if (trigger_bits == 0) {
	 /*turn Macrovision OFF. */
	 nMode = nNTSC_APS00;
      } else if (trigger_bits == 1) {
	 /*AGC Only. */
	 nMode = nNTSC_APS01;
      } else if (trigger_bits == 2) {
	 /*AGC + 2-line CS. */
	 nMode = nNTSC_APS10;
      } else {
	 /*AGC + 4-line CS. */
	 nMode = nNTSC_APS11;
      }
   } else {
      /*PAL TV Standard. */
      if (trigger_bits == 0) {
	 /*turn Macrovision OFF. */
	 nMode = nPAL_APS00;
      } else {
	 /*APS 01, 10, or 11. */
	 nMode = nPAL_APSXX;
      }
   }

   /*Retrieve the Macrovision Program Mode Data */
   if (tv_std != GFX_TV_STANDARD_PAL_M)
      n0 = mvsetup.n0[nMode];
   else {
      /*PAL-M sets up like NTSC except for n0. */
      if ((trigger_bits & 0x03) == 0)
	 n0 = mvsetup.n0[nPAL_APS00];
      else
	 n0 = mvsetup.n0[nPAL_APSXX];
   }

   /*download settings now. */
   houston_WriteReg(MV_N0, n0, 1);
   houston_WriteReg(MV_N1, mvsetup.n1[nMode], 1);
   houston_WriteReg(MV_N2, mvsetup.n2[nMode], 1);
   houston_WriteReg(MV_N3, mvsetup.n3[nMode], 1);
   houston_WriteReg(MV_N4, mvsetup.n4[nMode], 1);
   houston_WriteReg(MV_N5, mvsetup.n5[nMode], 1);
   houston_WriteReg(MV_N6, mvsetup.n6[nMode], 1);
   houston_WriteReg(MV_N7, mvsetup.n7[nMode], 1);
   houston_WriteReg(MV_N8, mvsetup.n8[nMode], 1);
   houston_WriteReg(MV_N9, mvsetup.n9[nMode], 1);
   houston_WriteReg(MV_N10, mvsetup.n10[nMode], 1);
   houston_WriteReg(MV_N11, mvsetup.n11[nMode] & 0xff, 1);
   houston_WriteReg(MV_N11 + 1, mvsetup.n11[nMode] >> 8, 1);
   houston_WriteReg(MV_N12, mvsetup.n12[nMode] & 0xff, 1);
   houston_WriteReg(MV_N12 + 1, mvsetup.n12[nMode] >> 8, 1);
   houston_WriteReg(MV_N13, mvsetup.n13[nMode], 1);
   houston_WriteReg(MV_N14, mvsetup.n14[nMode], 1);
   houston_WriteReg(MV_N15, mvsetup.n15[nMode], 1);
   houston_WriteReg(MV_N16, mvsetup.n16[nMode], 1);
   houston_WriteReg(MV_N17, mvsetup.n17[nMode], 1);
   houston_WriteReg(MV_N18, mvsetup.n18[nMode], 1);
   houston_WriteReg(MV_N19, mvsetup.n19[nMode], 1);
   houston_WriteReg(MV_N20, mvsetup.n20[nMode], 1);
   houston_WriteReg(MV_N21, mvsetup.n21[nMode] & 0xff, 1);
   houston_WriteReg(MV_N21 + 1, mvsetup.n21[nMode] >> 8, 1);
   houston_WriteReg(MV_N22, mvsetup.n22[nMode], 1);
   houston_WriteReg(MV_AGC_PULSE_LEVEL, mvsetup.agc_pulse_level[nMode], 1);
   houston_WriteReg(MV_BP_PULSE_LEVEL, mvsetup.bp_pulse_level[nMode], 1);

   houston_ReadReg(HOUSTON_MISC, &misc, 2);
   if (trigger_bits == 0)
      misc &= ~MISC_MV_SOFT_EN;
   else
      misc |= MISC_MV_SOFT_EN;
   houston_WriteReg(HOUSTON_MISC, misc, 2);
}

static void
conget_macrovision(unsigned long tv_std, unsigned int *p_cp_trigger_bits)
{
   unsigned long n0, n1;

   if (!p_cp_trigger_bits)
      return;

   houston_ReadReg(MV_N0, &n0, 1);
   houston_ReadReg(MV_N1, &n1, 1);

   *p_cp_trigger_bits = 0;

   if (IS_NTSC(tv_std)) {
      switch (n0) {
      case 0:
	 *p_cp_trigger_bits = 0;
	 break;

      case 0x36:
	 *p_cp_trigger_bits = 1;
	 break;

      case 0x3E:
	 {
	    if (0x1D == n1)
	       *p_cp_trigger_bits = 2;
	    else
	       *p_cp_trigger_bits = 3;
	 }
	 break;
      }
   } else if (IS_PAL(tv_std)) {
      if (0 == n0)
	 *p_cp_trigger_bits = 0;
      else {
	 /*don't know here what the non-zero trigger bits were */
	 *p_cp_trigger_bits = 1;
      }
   }
}

/*//	PLAL_MediaGX.cpp*/
/*//==========================================================================*/
/****/
/*These functions provides implementation of platform-specific functions*/
/*MediaGX platform.*/
/****/
/*//==========================================================================*/

/*MediaGX control registers.*/
#define CCR3	0xC3
#define	GCR		0xb8

/*Media GX registers*/
/*
#define	DC_UNLOCK			0x8300
#define	DC_GENERAL_CFG		0x8304
#define	DC_TIMING_CFG		0x8308
#define	DC_OUTPUT_CFG		0x830c
#define	DC_H_TIMING_1		0X8330
#define	DC_H_TIMING_2		0X8334
#define	DC_H_TIMING_3		0X8338
#define	DC_FP_H_TIMING		0X833c
#define	DC_V_TIMING_1		0X8340
#define	DC_V_TIMING_2		0X8344
#define	DC_V_TIMING_3		0X8348
#define	DC_FP_V_TIMING		0X834c
*/
/*Media GX general config register.*/
#define	GX_DCLK_MUL			0x00c0
#define	GX_DCLKx1			0x0040
#define	GX_DCLKx2			0x0080
#define GX_DCLKx4			0x00c0

/*Media GX timing config register.*/
#define	GX_TGEN				0x0020

/*Cx5530 register offsets (from GX_BASE).*/
#define	CX_DISPLAY_CONFIG	0x10004
#define	CX_DOT_CLK			0x10024
#define	CX_TV_CONFIG		0x10028

/*Cx5530 display configuration register.*/
#define	CX_FPVSYNC_POL		0x0800
#define	CX_FPHSYNC_POL		0x0400
#define	CX_FPDATA_ENB		0x0080
#define	CX_FPPOWER_ENB		0x0040
#define CX_CRTVSYNC_POL		0x0200
#define CX_CRTHSYNC_POL		0x0100

/*Cx5530 dot clock configuration register.*/
#define	CX_TVCLK_SELECT		0x0400

/*Cx5530 tv configuration register*/
#define CX_INVERT_FPCLK (1 << 6)

/*//==========================================================================*/
/****/
/*//	FS450 I2C Address*/
/****/
/*//	There are two possible 7-bit addresses, 0x4A and 0x6A.*/
/*//	The address if selectable via pins on the FS450.*/
/*//	There are also two possible 10-bit addresses, 0x224 and 0x276, but this*/
/*//	source is not designed to use them.*/
/****/

#define	FS450_I2C_ADDRESS (0x4A)

static unsigned char
PLAL_FS450_i2c_address(void)
{
   return FS450_I2C_ADDRESS;
}

/*//==========================================================================*/
/****/
/*//	FS450 UIM mode*/
/****/
/*//	This mode is programmed in the FS450 command register when enabling TV*/
/*//	out.*/

static int
PLAL_FS450_UIM_mode(void)
{
   return 3;
}

/*//==========================================================================*/
/****/
/*//	Read and Write MediaGX registers*/

static unsigned long
ReadGx(unsigned long inRegAddr)
{
   unsigned long data;

   DMAL_ReadUInt32(inRegAddr, &data);

   return data;
}

static void
WriteGx(unsigned long inRegAddr, unsigned long inData)
{
   int is_timing_register;
   unsigned long reg_timing_cfg;

   /*because the unlock register for the MediaGx video registers may not */
   /*persist, we will write the unlock code before every write. */
   DMAL_WriteUInt32(DC_UNLOCK, 0x4758);

   /*see if register is a timing register */
   is_timing_register =
	 (DC_H_TIMING_1 == inRegAddr) ||
	 (DC_H_TIMING_2 == inRegAddr) ||
	 (DC_H_TIMING_3 == inRegAddr) ||
	 (DC_FP_H_TIMING == inRegAddr) ||
	 (DC_V_TIMING_1 == inRegAddr) ||
	 (DC_V_TIMING_2 == inRegAddr) ||
	 (DC_V_TIMING_3 == inRegAddr) || (DC_FP_V_TIMING == inRegAddr);

   /*if the register is a timing register, clear the TGEN bit to allow modification */
   if (is_timing_register) {
      DMAL_ReadUInt32(DC_TIMING_CFG, &reg_timing_cfg);
      DMAL_WriteUInt32(DC_TIMING_CFG, reg_timing_cfg & ~GX_TGEN);
   }

   /*write the requested register */
   DMAL_WriteUInt32(inRegAddr, inData);

   /*reset the TGEN bit to previous state */
   if (is_timing_register) {
      DMAL_WriteUInt32(DC_TIMING_CFG, reg_timing_cfg);
   }
}

#ifdef FS450_DIRECTREG

/*//==========================================================================*/
/****/
/*//	Platform-specific processing for a Read or Write Register calls.*/
/*//	The functions should return true if the specified register belongs to*/
/*//	this platform.*/

static int
PLAL_ReadRegister(S_REG_INFO * p_reg)
{
   if (!p_reg)
      return 0;

   if (SOURCE_GCC == p_reg->source) {
      p_reg->value = ReadGx(p_reg->offset);

      return 1;
   }

   return 0;
}

static int
PLAL_WriteRegister(const S_REG_INFO * p_reg)
{
   if (!p_reg)
      return 0;

   if (SOURCE_GCC == p_reg->source) {
      WriteGx(p_reg->offset, p_reg->value);

      return 1;
   }

   return 0;
}

#endif

/*//==========================================================================*/
/****/
/*//	Determine if TV is on*/

static int
PLAL_IsTVOn(void)
{
   unsigned long reg;

   /*check Cx5530 dot clock */
   reg = ReadGx(CX_DOT_CLK);
   return (reg & CX_TVCLK_SELECT) ? 1 : 0;
}

/*//==========================================================================*/
/****/
/*//	Platform-specific actions to reset to VGA mode*/

static int
PLAL_EnableVga(void)
{
   unsigned long reg;

   /*2 x dclk */
   reg = ReadGx(DC_GENERAL_CFG);
   reg &= ~GX_DCLK_MUL;
   reg |= GX_DCLKx2;
   WriteGx(DC_GENERAL_CFG, reg);

   /*select pll dot clock. */
   reg = ReadGx(CX_DOT_CLK);
   reg &= ~CX_TVCLK_SELECT;
   WriteGx(CX_DOT_CLK, reg);

   /*timing config, reset everything on dclk. */
   reg = ReadGx(DC_TIMING_CFG);
   reg &= ~GX_TGEN;
   WriteGx(DC_TIMING_CFG, reg);
   reg |= GX_TGEN;
   WriteGx(DC_TIMING_CFG, reg);

   /*un-invert FP clock */
   reg = ReadGx(CX_TV_CONFIG);
   reg &= ~CX_INVERT_FPCLK;
   WriteGx(CX_TV_CONFIG, reg);

   return 0;
}

/*//==========================================================================*/
/****/
/*//	Platform-specific actions to enter TVout mode*/

static int
PLAL_PrepForTVout(void)
{
   unsigned int reg;

   /*Cx5530 tv config. */
   reg = 0;
   WriteGx(CX_TV_CONFIG, reg);

   /*invert FP clock */
   reg = (int)ReadGx(CX_TV_CONFIG);
   reg |= CX_INVERT_FPCLK;
   WriteGx(CX_TV_CONFIG, reg);

   return 0;
}

static int
PLAL_SetTVTimingRegisters(const S_TIMING_SPECS * p_specs)
{
   unsigned long reg;

   /*timing config, reset everything on dclk. */
   reg = ReadGx(DC_TIMING_CFG);
   reg &= ~GX_TGEN;
   WriteGx(DC_TIMING_CFG, reg);

   /*htotal and hactive. */
   reg = ((p_specs->h_total - 1) << 16) | (p_specs->vga_width - 1);
   WriteGx(DC_H_TIMING_1, reg);

   /*hblank. */
   reg = ((p_specs->h_total - 1) << 16) | (p_specs->vga_width - 1);
   WriteGx(DC_H_TIMING_2, reg);

   /*hsync. */
   reg = ((p_specs->h_sync + 63) << 16) | p_specs->h_sync;
   WriteGx(DC_H_TIMING_3, reg);

   /*fp hsync. */
   WriteGx(DC_FP_H_TIMING, reg);

   /*vtotal and vactive. */
   reg = ((p_specs->v_total - 1) << 16) | (p_specs->vga_lines - 1);
   WriteGx(DC_V_TIMING_1, reg);

   /*vblank. */
   reg = ((p_specs->v_total - 1) << 16) | (p_specs->vga_lines - 1);
   WriteGx(DC_V_TIMING_2, reg);

   /*vsync. */
   reg = ((p_specs->v_sync) << 16) | (p_specs->v_sync - 1);
   WriteGx(DC_V_TIMING_3, reg);

   /*fp vsync. */
   reg = ((p_specs->v_sync - 1) << 16) | (p_specs->v_sync - 2);
   WriteGx(DC_FP_V_TIMING, reg);

   /*timing config, reenable all dclk stuff. */
   reg = ReadGx(DC_TIMING_CFG);
   reg |= GX_TGEN;
   WriteGx(DC_TIMING_CFG, reg);

   return 0;
}

static int
PLAL_FinalEnableTVout(unsigned long vga_mode)
{
   unsigned int reg;

   /*Cx5530 select tv dot clock. */
   reg = (int)ReadGx(CX_DOT_CLK);
   reg |= CX_TVCLK_SELECT;
   WriteGx(CX_DOT_CLK, reg);

   /*2 x dclk (actually 1x) */
   reg = (int)ReadGx(DC_GENERAL_CFG);
   reg &= ~GX_DCLK_MUL;
   WriteGx(DC_GENERAL_CFG, reg);

   reg |= GX_DCLKx2;
   WriteGx(DC_GENERAL_CFG, reg);

   /*Cx5530 display configuration register. */
   reg = (int)ReadGx(CX_DISPLAY_CONFIG);
   reg |= (CX_FPVSYNC_POL | CX_FPHSYNC_POL | CX_FPDATA_ENB | CX_FPPOWER_ENB);
   WriteGx(CX_DISPLAY_CONFIG, reg);

/*disable, shouldn't be necessary*/
#if 0
   /*kick MediaGX clock multiplier to clean up clock */
   reg = ReadGx(DC_GENERAL_CFG);
   reg &= ~GX_DCLK_MUL;
   WriteGx(DC_GENERAL_CFG, reg);
   reg |= GX_DCLKx2;
   WriteGx(DC_GENERAL_CFG, reg);
#endif

   return 0;
}