path: root/hw/kdrive/sis530/sis.c

/*
 * Id: sis.c,v 1.1 1999/11/02 08:17:24 keithp Exp $
 *
 * Copyright © 1999 Keith Packard
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Keith Packard not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Keith Packard makes no
 * representations about the suitability of this software for any purpose.  It
 * is provided "as is" without express or implied warranty.
 *
 * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */
/* $XFree86: xc/programs/Xserver/hw/kdrive/sis530/sis.c,v 1.2 1999/12/30 03:03:14 robin Exp $ */

#include "sis.h"

#define MAX_FB_SIZE	(4096 * 1024)

#define MMIO_SIZE	(64 * 1024)

#define SIS_TIMING_BAIL	2

SisTiming    sisTimings[] = {
	     /* FP	BP	BLANK   */
    { 640, 480, 85,
		56,	80,	192,    /* horizontal	43.265 KHz */
		1,	25,	29,	/* vertical	85.000 Hz  */
					/* pixel	35.996 MHz */
    },
    
    { 640, 480, 75,
		16,	120,	200,    /* horizontal	37.500 KHz */
		1,	16,	20,	/* vertical	75.000 Hz  */
					/* pixel	31.500 MHz */
    },
    
    { 640, 480, 60,
		16,	48,	160,    /* horizontal	31.321 KHz */
		10,	33,	45,	/* vertical	59.568 Hz  */
					/* pixel	25.057 MHz */
    },
    
    { 800, 600, 85,
		32,	152,	248,    /* horizontal	53.673 KHz */
		1,	27,	31,	/* vertical	85.060 Hz  */
					/* pixel	56.249 MHz */
    },
    { 800, 600, 75,
		16,	160,	256,    /* horizontal	46.891 KHz */
		1,	21,	25,	/* vertical	75.025 Hz  */
					/* pixel	49.516 MHz */
    },
    { 800, 600, 72,
		56,	64,	240,    /* horizontal	48.186 KHz */
		37,	23,	66,	/* vertical	72.351 Hz  */
					/* pixel	50.113 MHz */
    },
    
    { 1024, 768, 85,
		48,	208,	352,    /* horizontal	68.676 KHz */
		1,	36,	40,	/* vertical	84.996 Hz  */
					/* pixel	94.499 MHz */
    },
    { 1024, 768, 75,
		16,	176,	288,    /* horizontal	60.022 KHz */
		1,	28,	32,	/* vertical	75.028 Hz  */
					/* pixel	78.749 MHz */
    },
    { 1024, 768, 70,
		24,	144,	304,    /* horizontal	56.604 KHz */
		3,	29,	38,	/* vertical	70.227 Hz  */
					/* pixel	75.170 MHz */
    },
    { 1024, 768, 66,
		24,	144,	304,	/* horizontal	53.234 KHz */
		3,	29,	38,	/* vertical	66.047 Hz  */
					/* pixel	70.695 MHz */
    },
    
    { 1152, 900, 85,
		48,	208,	384,	/* horizontal	 79.900 KHz */
		1,	32,	38,	/* vertical	 85.181 Hz  */
					/* pixel	122.726 MHz */
    },
    { 1152, 900, 75,
		32,	208,	384,	/* horizontal	 70.495 Khz */
		1,	32,	38,	/* vertical	 75.154  Hz */
					/* pixel	108.280 MHz */
    },
    { 1152, 900, 70,
		32,	208,	384,    /* horizontal	 65.251 KHz */
		2,	32,	38,	/* vertical	 69.564 Hz  */
					/* pixel	100.226 MHz */
    },
    { 1152, 900, 66,
		32,	208,	384,    /* horizontal	61.817 KHz */
		1,	32,	38,	/* vertical	65.903 Hz  */
					/* pixel	94.951 MHz */
    },
    { 1280, 1024, 85,
		16,	248,	416,	/* horizontal	 90.561 KHz */
		1,	40,	45,	/* vertical	 84.717 Hz  */
					/* pixel	153.593 MHz */
    },
    { 1280, 1024, 75,
		16,	248,	408,    /* horizontal	 80.255 KHz */
		1,	38,	42,	/* vertical	 75.285 Hz  */
					/* pixel	134.828 MHz */
    },
    { 1280, 1024, 70,
		32,	248,	400,    /* horizontal	 74.573 KHz */
		0,	36,	39,	/* vertical	 70.153 Hz  */
					/* pixel        125.283 MHz */
    },
    { 1280, 1024, 66,
		32,	248,	400,    /* horizontal	 70.007 KHz */
		0,	36,	39,	/* vertical	 65.858 Hz  */
					/* pixel        117.612 MHz */
    },
    
    { 1600, 1200, 85,
		64,	304,	560,    /* horizontal	106.059 KHz */
		1,	46,	50,	/* vertical	 84.847 Hz  */
					/* pixel	229.088 MHz */
    },
    { 1600, 1200, 75,
		64,	304,	560,    /* horizontal	 93.748 KHz */
		1,	46,	50,	/* vertical	 74.999 Hz  */
					/* pixel	202.497 MHz */
    },
    { 1600, 1200, 70,
		56,	304,	588,	/* horizontal	 87.524 KHz */
		1,	46,	50,	/* vertical	 70.019 Hz  */
					/* pixel	191.503 MHz */
    },
    { 1600, 1200, 65,
		56,	308,	524,    /* horizontal	 80.050 KHz */
		1,	38,	42,	/* vertical	 64.453 Hz  */
					/* pixel	170.026 MHz */
    },
};

#define NUM_SIS_TIMINGS	(sizeof (sisTimings) / sizeof (sisTimings[0]))

Bool
sisCardInit (KdCardInfo *card)
{
    SisCardInfo	    *sisc;
    SisPtr	    sis;
    int		    size;
    CARD8	    *registers;
    CARD8	    *temp_buffer;

    sisc = (SisCardInfo *) xalloc (sizeof (SisCardInfo));
    if (!sisc)
	goto bail0;
    
    temp_buffer = KdMapDevice (card->attr.address[0], MAX_FB_SIZE);
    if (!temp_buffer)
	goto bail1;
    
    sisc->memory = KdFrameBufferSize (temp_buffer, MAX_FB_SIZE);

    KdUnmapDevice (temp_buffer, MAX_FB_SIZE);

    if (!sisc->memory)
    {
	ErrorF ("Can't detect SiS530 frame buffer\n");
	goto bail1;
    }

    /*
     * Map frame buffer and MMIO registers
     */
    sisc->frameBuffer = KdMapDevice (card->attr.address[0], sisc->memory);
    if (!sisc->frameBuffer)
	goto bail1;
    
    sisc->registers = KdMapDevice (card->attr.address[1], MMIO_SIZE);
    if (!sisc->registers)
	goto bail2;
    
    /*
     * Offset from base of MMIO to registers
     */
    sisc->sis = (SisPtr) (sisc->registers + SIS_MMIO_OFFSET);
    sisc->cpu_bitblt = (VOL32 *) sisc->registers;
    sisc->io_base = card->attr.io;

    /*
     * enable access to SiS ports (no MMIO available) 
     */
    ioperm (sisc->io_base, 0x80, 1);
    card->driver = sisc;
    
    return TRUE;
bail2:
    KdUnmapDevice (sisc->frameBuffer, sisc->memory);
bail1:
    xfree (sisc);
bail0:
    return FALSE;
}
    
SisTiming *
sisGetTiming (int width, int height, int rate)
{
    int		i;
    SisTiming	*t;
    
    for (i = 0; i < NUM_SIS_TIMINGS; i++)
    {
	t = &sisTimings[i];
	if (t->horizontal >= width &&
	    t->vertical >= height &&
	    (!rate || t->rate <= rate))
	    return t;
    }
    return &sisTimings[SIS_TIMING_BAIL];
}

Bool
sisScreenInit (KdScreenInfo *screen)
{
    KdCardInfo	    *card = screen->card;
    SisCardInfo	    *sisc = (SisCardInfo *) card->driver;
    SisScreenInfo   *siss;
    int		    i;
    SisTiming	    *t;
    CARD32	    memory;
    int		    byte_width, pixel_width, screen_size;

    siss = (SisScreenInfo *) xalloc (sizeof (SisScreenInfo));
    if (!siss)
	return FALSE;

    memset (siss, '\0', sizeof (SisScreenInfo));

    if (!screen->width || !screen->height)
    {
	screen->width = 800;
	screen->height = 600;
	screen->rate = 72;
    }
    if (!screen->depth)
	screen->depth = 8;
    
    for (;;)
    {
	if (screen->depth >= 24)
	{
	    screen->depth = 24;
	    screen->bitsPerPixel = 24;
	}
	else if (screen->depth >= 16)
	{
	    screen->depth = 16;
	    screen->bitsPerPixel = 16;
	}
	else if (screen->depth >= 15)
	{
	    screen->depth = 15;
	    screen->bitsPerPixel = 16;
	}
	else
	{
	    screen->depth = 8;
	    screen->bitsPerPixel = 8;
	}

	/* Normalize width to supported values */
	
	if (screen->width >= 1600)
	    screen->width = 1600;
	else if (screen->width >= 1280)
	    screen->width = 1280;
	else if (screen->width >= 1152)
	    screen->width = 1152;
	else if (screen->width >= 1024)
	    screen->width = 1024;
	else if (screen->width >= 800)
	    screen->width = 800;
	else
	    screen->width = 640;
	
	byte_width = screen->width * (screen->bitsPerPixel >> 3);
	pixel_width = screen->width;
	screen->pixelStride = pixel_width;
	screen->byteStride = byte_width;

	screen_size = byte_width * screen->height;
	
	if (screen_size <= sisc->memory)
	    break;

	/*
	 * Fix requested depth and geometry until it works
	 */
	if (screen->depth > 16)
	    screen->depth = 16;
	else if (screen->depth > 8)
	    screen->depth = 8;
	else if (screen->width > 1152)
	{
	    screen->width = 1152;
	    screen->height = 900;
	}
	else if (screen->width > 1024)
	{
	    screen->width = 1024;
	    screen->height = 768;
	}
	else if (screen->width > 800)
	{
	    screen->width = 800;
	    screen->height = 600;
	}
	else if (screen->width > 640)
	{
	    screen->width = 640;
	    screen->height = 480;
	}
	else
	{
	    xfree (siss);
	    return FALSE;
	}
    }
    
    t = sisGetTiming (screen->width, screen->height, screen->rate);
    screen->rate = t->rate;
    screen->width = t->horizontal;
    screen->height = t->vertical;
    
    /*
     * Take requested geometry and adjust to fit possible geometries
     */
    switch (screen->depth) {
    case 4:
	screen->bitsPerPixel = 4;
	break;
    case 8:
	screen->bitsPerPixel = 8;
	break;
    case 15:
    case 16:
	screen->bitsPerPixel = 16;
	break;
    case 24:
    case 32:
	screen->bitsPerPixel = 24;
	screen->dumb = TRUE;
	break;
    }

    screen->byteStride = screen->width * (screen->bitsPerPixel >> 3);
    screen->pixelStride = screen->width;

    memory = sisc->memory - screen_size;
    
    screen->frameBuffer = sisc->frameBuffer;
    
    /*
     * Cursor lives in the last 16k of memory
     */
    if (memory >= 16384 && !screen->softCursor)
    {
	siss->cursor_base = sisc->frameBuffer + (sisc->memory - 16384);
	siss->cursor_off = siss->cursor_base - sisc->frameBuffer;
	memory -= 16384;
    }
    else
    {
	screen->softCursor = TRUE;
	siss->cursor_base = 0;
	siss->cursor_off = 0;
    }

    if (memory > 8192)
    {
	siss->expand = screen->frameBuffer + screen_size;
	siss->expand_off = siss->expand - sisc->frameBuffer;
	siss->expand_len = memory;
	memory = 0;
    }
    else
    {
	siss->expand = 0;
	siss->expand_len = 0;
    }
    
    switch (screen->depth) {
    case 8:
	screen->visuals = ((1 << StaticGray) |
			   (1 << GrayScale) |
			   (1 << StaticColor) |
			   (1 << PseudoColor) |
			   (1 << TrueColor) |
			   (1 << DirectColor));
	screen->blueMask  = 0x00;
	screen->greenMask = 0x00;
	screen->redMask   = 0x00;
	break;
    case 15:
	screen->visuals = (1 << TrueColor);
	screen->blueMask  = 0x001f;
	screen->greenMask = 0x03e0;
	screen->redMask   = 0x7c00;
	break;
    case 16:
	screen->visuals = (1 << TrueColor);
	screen->blueMask  = 0x001f;
	screen->greenMask = 0x07e0;
	screen->redMask   = 0xf800;
	break;
    case 24:
	screen->visuals = (1 << TrueColor);
	screen->blueMask  = 0x0000ff;
	screen->greenMask = 0x00ff00;
	screen->redMask   = 0xff0000;
	break;
    }
    
    screen->driver = siss;
    
    return TRUE;
}

static void
_sisGetCrtc (SisCardInfo *sisc, SisCrtc *crtc)
{
    crtc->misc_output			= _sisInb(sisc->io_base+0x4c);
    crtc->h_total_0_7			= GetCrtc (sisc, 0x00);
    crtc->h_display_end_0_7		= GetCrtc (sisc, 0x01);
    crtc->h_blank_start_0_7		= GetCrtc (sisc, 0x02);
    crtc->_h_blank_end			= GetCrtc (sisc, 0x03);
    crtc->h_sync_start_0_7		= GetCrtc (sisc, 0x04);
    crtc->_h_sync_end			= GetCrtc (sisc, 0x05);
    crtc->v_total_0_7			= GetCrtc (sisc, 0x06);
    crtc->crtc_overflow			= GetCrtc (sisc, 0x07);
    crtc->preset_row_scan		= GetCrtc (sisc, 0x08);
    crtc->_max_scan_line		= GetCrtc (sisc, 0x09);
    
    crtc->start_address_8_15		= GetCrtc (sisc, 0x0c);
    crtc->start_address_0_7		= GetCrtc (sisc, 0x0d);

    crtc->v_retrace_start_0_7		= GetCrtc (sisc, 0x10);
    crtc->_v_retrace_end		= GetCrtc (sisc, 0x11);
    crtc->v_display_end_0_7		= GetCrtc (sisc, 0x12);
    crtc->screen_off_0_7	    	= GetCrtc (sisc, 0x13);
    crtc->_underline_location		= GetCrtc (sisc, 0x14);
    crtc->v_blank_start_0_7		= GetCrtc (sisc, 0x15);
    crtc->v_blank_end_0_7		= GetCrtc (sisc, 0x16);
    crtc->crtc_mode			= GetCrtc (sisc, 0x17);
    
    crtc->line_compare_0_7		= GetCrtc (sisc, 0x18);
    
    crtc->mode_control			= GetArtc (sisc, 0x10);
    crtc->screen_border_color		= GetArtc (sisc, 0x11);
    crtc->enable_color_plane		= GetArtc (sisc, 0x12);
    crtc->horizontal_pixel_pan		= GetArtc (sisc, 0x13);

    crtc->mode_register			= GetGrtc (sisc, 0x5);
    
    crtc->clock_mode			= GetSrtc (sisc, 0x1);
    
    crtc->graphics_mode			= GetSrtc (sisc, 0x6);
    crtc->misc_control_0    		= GetSrtc (sisc, 0x7);
    crtc->crt_cpu_threshold_control_0	= GetSrtc (sisc, 0x8);
    crtc->crt_cpu_threshold_control_1	= GetSrtc (sisc, 0x9);
    crtc->extended_crt_overflow		= GetSrtc (sisc, 0xa);
    crtc->misc_control_1    		= GetSrtc (sisc, 0xb);
    crtc->misc_control_2    		= GetSrtc (sisc, 0xc);
    
    crtc->ddc_and_power_control		= GetSrtc (sisc, 0x11);
    crtc->extended_horizontal_overflow	= GetSrtc (sisc, 0x12);
    crtc->extended_clock_generator    	= GetSrtc (sisc, 0x13);
    crtc->cursor_0_red			= GetSrtc (sisc, 0x14);
    crtc->cursor_0_green    		= GetSrtc (sisc, 0x15);
    crtc->cursor_0_blue			= GetSrtc (sisc, 0x16);
    crtc->cursor_1_red			= GetSrtc (sisc, 0x17);
    crtc->cursor_1_green    		= GetSrtc (sisc, 0x18);
    crtc->cursor_1_blue			= GetSrtc (sisc, 0x19);
    crtc->cursor_h_start_0_7		= GetSrtc (sisc, 0x1a);
    crtc->cursor_h_start_1    		= GetSrtc (sisc, 0x1b);
    crtc->cursor_h_preset_0_5    	= GetSrtc (sisc, 0x1c);
    crtc->cursor_v_start_0_7		= GetSrtc (sisc, 0x1d);
    crtc->cursor_v_start_1    		= GetSrtc (sisc, 0x1e);
    crtc->cursor_v_preset_0_5 		= GetSrtc (sisc, 0x1f);
    crtc->linear_base_19_26		= GetSrtc (sisc, 0x20);
    crtc->linear_base_1			= GetSrtc (sisc, 0x21);

    crtc->graphics_engine_0		= GetSrtc (sisc, 0x26);
    crtc->graphics_engine_1		= GetSrtc (sisc, 0x27);
    crtc->internal_mclk_0		= GetSrtc (sisc, 0x28);
    crtc->internal_mclk_1		= GetSrtc (sisc, 0x29);
    crtc->internal_vclk_0		= GetSrtc (sisc, 0x2A);
    crtc->internal_vclk_1		= GetSrtc (sisc, 0x2B);

    crtc->misc_control_7		= GetSrtc (sisc, 0x38);
    
    crtc->misc_control_11		= GetSrtc (sisc, 0x3E);
    crtc->misc_control_12		= GetSrtc (sisc, 0x3F);
}

static void
_sisSetBlank (SisCardInfo *sisc, Bool blank)
{
    CARD8   clock;
    
    clock = GetSrtc (sisc, 0x01);
    if (blank)
	clock |= 0x20;
    else
	clock &= ~0x20;
    PutSrtc (sisc, 0x01, clock);
}

static void
_sisSetCrtc (SisCardInfo *sisc, SisCrtc *crtc)
{
    _sisOutb(crtc->misc_output, sisc->io_base+0x4c);
    _sisSetBlank (sisc, TRUE);
    PutCrtc (sisc, 0x00, crtc->h_total_0_7);
    PutCrtc (sisc, 0x01, crtc->h_display_end_0_7);
    PutCrtc (sisc, 0x02, crtc->h_blank_start_0_7);
    PutCrtc (sisc, 0x03, crtc->_h_blank_end);
    PutCrtc (sisc, 0x04, crtc->h_sync_start_0_7);
    PutCrtc (sisc, 0x05, crtc->_h_sync_end);
    PutCrtc (sisc, 0x06, crtc->v_total_0_7);
    PutCrtc (sisc, 0x07, crtc->crtc_overflow);
    PutCrtc (sisc, 0x08, crtc->preset_row_scan);
    PutCrtc (sisc, 0x09, crtc->_max_scan_line);
    
    PutCrtc (sisc, 0x0c, crtc->start_address_8_15);
    PutCrtc (sisc, 0x0d, crtc->start_address_0_7);

    PutCrtc (sisc, 0x10, crtc->v_retrace_start_0_7);
    PutCrtc (sisc, 0x11, crtc->_v_retrace_end);
    PutCrtc (sisc, 0x12, crtc->v_display_end_0_7);
    PutCrtc (sisc, 0x13, crtc->screen_off_0_7);
    PutCrtc (sisc, 0x14, crtc->_underline_location);
    PutCrtc (sisc, 0x15, crtc->v_blank_start_0_7);
    PutCrtc (sisc, 0x16, crtc->v_blank_end_0_7);
    PutCrtc (sisc, 0x17, crtc->crtc_mode);
    PutCrtc (sisc, 0x18, crtc->line_compare_0_7);
    
    PutArtc (sisc, 0x10, crtc->mode_control);
    PutArtc (sisc, 0x11, crtc->screen_border_color);
    PutArtc (sisc, 0x12, crtc->enable_color_plane);
    PutArtc (sisc, 0x13, crtc->horizontal_pixel_pan);

    PutGrtc (sisc, 0x5, crtc->mode_register);
    
    PutSrtc (sisc, 0x1, crtc->clock_mode | 0x20);
    
    PutSrtc (sisc, 0x6, crtc->graphics_mode);
    PutSrtc (sisc, 0x7, crtc->misc_control_0);
    PutSrtc (sisc, 0x8, crtc->crt_cpu_threshold_control_0);
    PutSrtc (sisc, 0x9, crtc->crt_cpu_threshold_control_1);
    PutSrtc (sisc, 0xa, crtc->extended_crt_overflow);
    PutSrtc (sisc, 0xb, crtc->misc_control_1);
    PutSrtc (sisc, 0xc, crtc->misc_control_2);
    
    PutSrtc (sisc, 0x11, crtc->ddc_and_power_control);
    PutSrtc (sisc, 0x12, crtc->extended_horizontal_overflow);
    PutSrtc (sisc, 0x13, crtc->extended_clock_generator);
    PutSrtc (sisc, 0x14, crtc->cursor_0_red);
    PutSrtc (sisc, 0x15, crtc->cursor_0_green);
    PutSrtc (sisc, 0x16, crtc->cursor_0_blue);
    PutSrtc (sisc, 0x17, crtc->cursor_1_red);
    PutSrtc (sisc, 0x18, crtc->cursor_1_green);
    PutSrtc (sisc, 0x19, crtc->cursor_1_blue);
    PutSrtc (sisc, 0x1a, crtc->cursor_h_start_0_7);
    PutSrtc (sisc, 0x1b, crtc->cursor_h_start_1);
    PutSrtc (sisc, 0x1c, crtc->cursor_h_preset_0_5);
    PutSrtc (sisc, 0x1d, crtc->cursor_v_start_0_7);
    PutSrtc (sisc, 0x1e, crtc->cursor_v_start_1);
    PutSrtc (sisc, 0x1f, crtc->cursor_v_preset_0_5);
    PutSrtc (sisc, 0x20, crtc->linear_base_19_26);
    PutSrtc (sisc, 0x21, crtc->linear_base_1);

    PutSrtc (sisc, 0x26, crtc->graphics_engine_0);
    PutSrtc (sisc, 0x27, crtc->graphics_engine_1);
    PutSrtc (sisc, 0x28, crtc->internal_mclk_0);
    PutSrtc (sisc, 0x29, crtc->internal_mclk_1);
    PutSrtc (sisc, 0x2A, crtc->internal_vclk_0);
    PutSrtc (sisc, 0x2B, crtc->internal_vclk_1);

    PutSrtc (sisc, 0x38, crtc->misc_control_7);
    
    PutSrtc (sisc, 0x3E, crtc->misc_control_11);
    PutSrtc (sisc, 0x3F, crtc->misc_control_12);
    
    _sisSetBlank (sisc, FALSE);
}

CARD8
_sisReadIndexRegister (CARD32 base, CARD8 index)
{
    CARD8   ret;

    _sisOutb (index, base);
    ret = _sisInb (base+1);
    return ret;
}

void
_sisWriteIndexRegister (CARD32 base, CARD8 index, CARD8 value)
{
    _sisOutb (index, base);
    _sisOutb (value, base+1);
}

void
sisPreserve (KdCardInfo *card)
{
    SisCardInfo	*sisc = card->driver;
    CARD8	*r = sisc->registers;
    int		a, i, l;
    CARD8	line[16];
    CARD8	prev[16];
    BOOL	gotone;
    
    sisc->save.sr5 = GetSrtc(sisc,0x5);
    if (sisc->save.sr5 != 0x21)
	sisc->save.sr5 = 0x86;
    /* unlock extension registers */
    PutSrtc(sisc,0x5,0x86);
    
    /* enable MMIO access to registers */
    sisc->save.srb = GetSrtc(sisc,0xb);
    PutSrtc(sisc, 0xb, sisc->save.srb | 0x60);
    _sisGetCrtc (sisc, &sisc->save.crtc);
}

void
sisEnable (ScreenPtr pScreen)
{
    KdScreenPriv(pScreen);
    KdScreenInfo    *screen = pScreenPriv->screen;
    KdCardInfo	    *card = pScreenPriv->card;
    SisCardInfo	    *sisc = card->driver;
    SisScreenInfo   *siss = screen->driver;
    SisTiming	    *t;
    SisCrtc	    crtc;
    unsigned long   pixel;
    
    int	    hactive;
    int	    hblank;
    int	    hfp;
    int	    hbp;

    int	    vactive;
    int	    vblank;
    int	    vfp;
    int	    vbp;

    int	    h_total;
    int	    h_display_end;
    int	    h_blank_start;
    int	    h_blank_end;
    int	    h_sync_start;
    int	    h_sync_end;
    int	    h_screen_off;

    int	    h_adjust;

    int	    v_total;
    int	    v_retrace_start;
    int	    v_retrace_end;
    int	    v_display_end;
    int	    v_blank_start;
    int	    v_blank_end;

    crtc = sisc->save.crtc;
    
    t = sisGetTiming (screen->width, screen->height, screen->rate);
    
    /* CR11 */
    crtc.disable_v_retrace_int = 1;
    
    /* 3CC/3C2 */
    crtc.io_address_select = 1;
    crtc.display_ram_enable = 1;
    crtc.clock_select = 3;
    
    /* SR6 */
    crtc.graphics_mode = 0;
    crtc.graphics_mode_linear = 1;
    crtc.enhanced_graphics_mode = 1;
    
    /* SRB */
    crtc.cpu_bitblt_enable = 1;
    crtc.memory_mapped_mode = 3;
    
    /* SRC */
    crtc.graphics_mode_32bit_enable = 1;
    crtc.text_mode_16bit_enable = 0;
    crtc.read_ahead_enable = 1;
    
    /* SR11 */
    crtc.acpi_enable = 0;
    crtc.kbd_cursor_activate = 0;
    crtc.video_memory_activate = 0;
    crtc.vga_standby = 0;
    crtc.vga_suspend = 0;
    
    /* AR10 */
    crtc.mode_control = 0;
    crtc.graphics_mode_enable = 1;
    /* AR11 */
    crtc.screen_border_color = 0;
    /* AR12 */
    crtc.enable_color_plane = 0xf;
    /* AR13 */
    crtc.horizontal_pixel_pan = 0;
    
    /* SR27 */
    crtc.logical_screen_width = 3;
    crtc.graphics_prog_enable = 1;
    
    /* SR38 */
    crtc.extended_clock_select = 0;
    
    if (siss->cursor_base)
    {
	crtc_set_cursor_start_addr (&crtc, siss->cursor_off);
	crtc.graphics_mode_hw_cursor = 0;
    }
    
    hactive = t->horizontal;
    hblank = t->hblank;
    hbp = t->hbp;
    hfp = t->hfp;
    
    vactive = t->vertical;
    vblank = t->vblank;
    vbp = t->vbp;
    vfp = t->vfp;
    
    pixel = (hactive + hblank) * (vactive + vblank) * t->rate;
    
    switch (screen->bitsPerPixel) {
    case 8:
	hactive /= 8;
	hblank /= 8;
	hfp /= 8;
	hbp /= 8;

	crtc.color_mode_256 = 1;
	h_screen_off = hactive;
	h_adjust = 1;
	
	break;
    case 16:
	hactive /= 8;
	hblank /= 8;
	hfp /= 8;
	hbp /= 8;

	h_screen_off = hactive * 2;
	h_adjust = 1;
	
	crtc.color_mode_256 = 0;
	
	if (screen->depth == 15)
	    crtc.graphics_mode_32k = 1;
	else
	    crtc.graphics_mode_64k = 1;
	break;
    case 24:
	hactive /= 8;
	hblank /= 8;
	hfp /= 8;
	hbp /= 8;
	
	h_screen_off = hactive * 3;
	h_adjust = 1;

	crtc.color_mode_256 = 0;
	
	/* SR6 */
	crtc.graphics_mode_true = 1;
	/* SR7 */
	crtc.direct_color_24bit = 0;
	/* SR9 */
	crtc.true_color_32bpp = 0;
	/* SRB */
	crtc.true_color_order = 1;
	break;
    case 32:
	hactive /= 8;
	hblank /= 8;
	hfp /= 8;
	hbp /= 8;
	
	h_screen_off = hactive * 4;
	h_adjust = 1;

	crtc.color_mode_256 = 0;
	
	/* SR6 */
	crtc.graphics_mode_true = 1;
	/* SR7 */
	crtc.direct_color_24bit = 0;
	/* SR9 */
	crtc.true_color_32bpp = 1;
	/* SRB */
	crtc.true_color_order = 1;
	break;
    }
	
    sisGetClock (pixel, &crtc);
    
    crtc.high_speed_dac_0 = crtc.high_speed_dac_1 = pixel > 135000000;
    
    sisEngThresh (&crtc, pixel, screen->bitsPerPixel);
    
    /*
     * Compute horizontal register values from timings
     */
    h_total = hactive + hblank - 5;
    h_display_end = hactive - 1;
    h_blank_start = h_display_end;
    h_blank_end = h_blank_start + hblank;
    
    h_sync_start = hactive + hfp + h_adjust;
    h_sync_end = h_sync_start + hblank - hbp - hfp;

    crtc_set_h_total(&crtc, h_total);
    crtc_set_h_display_end (&crtc, h_display_end);
    crtc_set_h_blank_start (&crtc, h_blank_start);
    crtc_set_h_blank_end (&crtc, h_blank_end);
    crtc_set_h_sync_start (&crtc, h_sync_start);
    crtc_set_h_sync_end (&crtc, h_sync_end);
    crtc_set_screen_off (&crtc, h_screen_off);

    v_total = vactive + vblank - 2;
    v_retrace_start = vactive + vfp - 1;
    v_retrace_end = v_retrace_start + vblank - vbp - vfp;
    v_display_end = vactive - 1;
    v_blank_start = vactive - 1;
    v_blank_end = v_blank_start + vblank /* - 1 */;
    
    crtc_set_v_total(&crtc, v_total);
    crtc_set_v_retrace_start (&crtc, v_retrace_start);
    crtc.v_retrace_end_0_3 = v_retrace_end;
    crtc_set_v_display_end (&crtc, v_display_end);
    crtc_set_v_blank_start (&crtc, v_blank_start);
    crtc.v_blank_end_0_7 = v_blank_end;
    
    _sisSetCrtc (sisc, &crtc);
}

Bool
sisDPMS (ScreenPtr pScreen, int mode)
{
    KdScreenPriv(pScreen);
    sisCardInfo(pScreenPriv);
    union ddc_and_power_control_u   _ddc_and_power_control_u;

    ddc_and_power_control = sisc->save.crtc.ddc_and_power_control;

    kbd_cursor_activate = 0;
    video_memory_activate = 0;
    vga_standby = 0;
    vga_suspend = 0;
    acpi_enable = 0;
    switch (mode) {
    case KD_DPMS_NORMAL:
	break;
    case KD_DPMS_STANDBY:
	vga_standby = 1;
	break;
    case KD_DPMS_SUSPEND:
	vga_suspend = 1;
	break;
    case KD_DPMS_POWERDOWN:
	acpi_enable = 1;
	break;
    }
    PutSrtc (sisc, 0x11, ddc_and_power_control);
    return TRUE;
}

void
sisDisable (ScreenPtr pScreen)
{
}

void
sisRestore (KdCardInfo *card)
{
    SisCardInfo	*sisc = (SisCardInfo *) card->driver;
    
    _sisSetCrtc (sisc, &sisc->save.crtc);
    PutSrtc (sisc, 0xb, sisc->save.srb);
    PutSrtc (sisc, 0x5, sisc->save.sr5);
}

void
sisScreenFini (KdScreenInfo *screen)
{
    SisScreenInfo   *siss = (SisScreenInfo *) screen->driver;
    
    xfree (siss);
    screen->driver = 0;
}

void
sisCardFini (KdCardInfo *card)
{
    SisCardInfo	*sisc = (SisCardInfo *) card->driver;
    
    KdUnmapDevice (sisc->frameBuffer, sisc->memory);
    KdUnmapDevice (sisc->registers, sizeof (SisRec));
    ioperm (sisc->io_base, 0x80, 0);
}

KdCardFuncs	sisFuncs = {
    sisCardInit,
    sisScreenInit,
    0,
    sisPreserve,
    sisEnable,
    sisDPMS,
    sisDisable,
    sisRestore,
    sisScreenFini,
    sisCardFini,
    sisCursorInit,
    sisCursorEnable,
    sisCursorDisable,
    sisCursorFini,
    0,
    sisDrawInit,
    sisDrawEnable,
    sisDrawSync,
    sisDrawDisable,
    sisDrawFini,
    sisGetColors,
    sisPutColors,
};