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windows-nt/Source/XPSP1/NT/drivers/video/ms/weitek/mini/bt485.c

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2020-09-26 03:20:57 -05:00
/*++
Copyright (c) 1993 Weitek Corporation
Module Name:
Bt485.c
Abstract:
This module contains code specific to the Bt485 DAC.
Environment:
Kernel mode
Revision History may be found at the end of this file.
--*/
#include "p9.h"
#include "p9gbl.h"
#include "p9000.h"
#include "bt485.h"
#include "p91dac.h"
//
// DAC specific static data.
//
//
// Define the DAC support routines structure for the Bt485 DAC.
//
DAC Bt485 = {
DAC_ID_BT485,
NUM_DAC_REGS,
Bt485SetMode,
Bt485RestoreMode,
Bt485SetPalette,
Bt485ClearPalette,
Bt485PointerOn,
Bt485PointerOff,
Bt485SetPointerPos,
Bt485SetPointerShape,
CLK_MAX_FREQ,
Bt485SetClkDoubler,
Bt485ClrClkDoubler
};
VOID
Bt485SetPalette(
PHW_DEVICE_EXTENSION HwDeviceExtension,
ULONG *pPal,
ULONG StartIndex,
ULONG Count
)
/*++
Routine Description:
Sets the Device palette
Arguments:
HwDeviceExtension - Pointer to the miniport driver's device extension.
pPal - Pointer to the array of pallete entries.
StartIndex - Specifies the first pallete entry provided in pPal.
Count - Number of palette entries in pPal
Return Value:
None.
--*/
{
UCHAR *pBytePal;
PAL_WR_ADDR((UCHAR) StartIndex);
pBytePal = (PUCHAR) pPal;
//
// Load the palette with RGB values. The input palette has 4 bytes
// per entry, the last of which is ignored.
//
while (Count--)
{
PAL_WR_DATA(*pBytePal++);
PAL_WR_DATA(*pBytePal++);
PAL_WR_DATA(*pBytePal++);
pBytePal++;
}
}
VOID
Bt485SetPointerPos(
PHW_DEVICE_EXTENSION HwDeviceExtension,
ULONG ptlX,
ULONG ptlY
)
/*++
Routine Description:
Move Hardware Pointer.
Arguments:
HwDeviceExtension - Pointer to the miniport driver's device extension.
ptlX, ptlY - Requested X,Y position for the pointer.
Return Value:
TRUE
--*/
{
//
// Strip off the invalid bits and update the cursor position regs.
//
WR_CURS_POS_X(((ptlX + CURSOR_WIDTH) & 0xFFF));
WR_CURS_POS_Y(((ptlY + CURSOR_HEIGHT) & 0xFFF));
return;
}
VOID
Bt485SetPointerShape(
PHW_DEVICE_EXTENSION HwDeviceExtension,
PUCHAR pHWCursorShape
)
/*++
Routine Description:
Sets the hardware cursor shape.
Arguments:
HwDeviceExtension - Pointer to the miniport driver's device extension.
pHWCursorShape - Pointer to the cursor bitmap.
Return Value:
None.
--*/
{
ULONG iCount;
//
// The # of bytes of cursor bitmap data to send *= 2 for and/xor mask
// *= 8 for 8bit/byte
// *= 2 for 2 loops
//
ULONG iLoop = (CURSOR_WIDTH * CURSOR_HEIGHT * 2) / (8 * 2);
//
// AND mask will be loaded to plane 1.
//
PAL_WR_ADDR(0x80);
iCount = iLoop;
WAIT_FOR_RETRACE();
while (iCount--)
{
WR_CURS_DATA(*pHWCursorShape++);
}
//
// XOR mask will be loaded to plane 0.
//
PAL_WR_ADDR(0x00);
iCount = iLoop;
WAIT_FOR_RETRACE();
while (iCount--)
{
WR_CURS_DATA(*pHWCursorShape++);
}
return;
}
VOID
Bt485PointerOn(
PHW_DEVICE_EXTENSION HwDeviceExtension
)
/*++
Routine Description:
Turn on the hardware cursor.
Arguments:
HwDeviceExtension - Pointer to the miniport driver's device extension.
Return Value:
None.
--*/
{
//
// Turn the cursor on only if it was disabled.
//
if (!CURS_IS_ON())
{
WAIT_FOR_RETRACE();
CURS_ON();
}
return;
}
VOID
Bt485PointerOff(
PHW_DEVICE_EXTENSION HwDeviceExtension
)
/*++
Routine Description:
Turn off the hardware cursor.
Arguments:
HwDeviceExtension - Pointer to the miniport driver's device extension.
Return Value:
None.
--*/
{
//
// Turn the cursor off only if it was enabled.
//
if (CURS_IS_ON())
{
WAIT_FOR_RETRACE();
CURS_OFF();
}
return;
}
VOID
Bt485ClearPalette(
PHW_DEVICE_EXTENSION HwDeviceExtension
)
/*++
Routine Description:
Clears the palette to all 0's
Arguments:
HwDeviceExtension - Pointer to the miniport driver's device extension.
Return Value:
None.
--*/
{
int Count;
//
// Calculate the number of palette entries. It is assumed that the
// caller has already determined that the current mode makes use
// of the palette,
//
Count = 1 << HwDeviceExtension->usBitsPixel;
//
// Fill the palette with RGB values of 0.
//
while (Count--)
{
PAL_WR_DATA(0);
PAL_WR_DATA(0);
PAL_WR_DATA(0);
}
return;
}
BOOLEAN
Bt485SetMode(
PHW_DEVICE_EXTENSION HwDeviceExtension
)
/*++
Routine Description:
Initializes the DAC for the current mode.
Arguments:
HwDeviceExtension - Pointer to the miniport driver's device extension.
Return Value:
None.
--*/
{
UCHAR ucCurState;
//
// Enable 8bit dacs, allow access to Command Register 3.
//
WR_DAC(CMD_REG_0, ENB_CMD_REG_3 | MODE_8_BIT);
//
// Set the DAC Pixel port value for the current bit depth.
//
switch (HwDeviceExtension->usBitsPixel)
{
case 8:
WR_DAC(CMD_REG_1, PIX_PORT_8);
break;
case 16:
WR_DAC(CMD_REG_1, PIX_PORT_16);
break;
case 32:
WR_DAC(CMD_REG_1, PIX_PORT_32);
break;
default:
//
// Oops..invalid BPP value. Use 8BPP value for now.
//
WR_DAC(CMD_REG_1, PIX_PORT_8);
break;
};
//
// Select P9000 video clock, disable cursor
//
WR_DAC(CMD_REG_2, (PORTSEL_MSKD | PCLK1_SEL) & DIS_CURS);
//
// Select 32x32x2 cursor mode, and clock doubler mode if neccessary.
//
RD_CMD_REG_3(ucCurState);
if (HwDeviceExtension->VideoData.dotfreq1 >
HwDeviceExtension->Dac.ulMaxClkFreq)
{
//
// Enable the DAC clock doubler mode.
//
HwDeviceExtension->Dac.DACSetClkDblMode(HwDeviceExtension);
}
else
{
//
// Disable the DAC clock doubler mode.
//
HwDeviceExtension->Dac.DACClrClkDblMode(HwDeviceExtension);
}
//
// Set the pixel read mask.
//
WR_DAC(PIXEL_MSK_REG, 0xff);
//
// Set cursor colors 1 and 2.
//
WR_DAC(CURS_CLR_ADDR, 1);
WR_DAC(CURS_CLR_DATA, 0x00);
WR_DAC(CURS_CLR_DATA, 0x00);
WR_DAC(CURS_CLR_DATA, 0x00);
WR_DAC(CURS_CLR_DATA, 0xFF);
WR_DAC(CURS_CLR_DATA, 0xFF);
WR_DAC(CURS_CLR_DATA, 0xFF);
return(TRUE);
}
VOID
Bt485RestoreMode(
PHW_DEVICE_EXTENSION HwDeviceExtension
)
/*++
routine description:
Restore the DAC to its pristine state.
arguments:
hwdeviceextension - pointer to the miniport driver's device extension.
return value:
--*/
{
UCHAR ucCurState;
//
// Enable accesses to CMD_REG_3.
//
WR_DAC(CMD_REG_0, ENB_CMD_REG_3);
//
// Set pixel port for 8bit pixels.
//
WR_DAC(CMD_REG_1, RD_DAC(CMD_REG_1) & ~PIX_PORT_24);
//
// Select VGA video clock, disable cursor.
//
WR_DAC(CMD_REG_2, (RD_DAC(CMD_REG_2) & DIS_CURS));
//
// Select 32x32 cursor, clear clock doubler bit.
//
RD_CMD_REG_3(ucCurState);
WR_CMD_REG_3(ucCurState & (~DAC_CLK_2X & CUR_MODE_32));
//
// Set pixel read mask.
//
WR_DAC(PIXEL_MSK_REG, 0xff);
return;
}
VOID
Bt485SetClkDoubler(
PHW_DEVICE_EXTENSION HwDeviceExtension
)
/*++
routine description:
Enable the DAC's internal clock doubler.
arguments:
hwdeviceextension - pointer to the miniport driver's device extension.
return value:
--*/
{
UCHAR ucCurState;
RD_CMD_REG_3(ucCurState);
WR_CMD_REG_3(ucCurState | DAC_CLK_2X);
return;
}
VOID
Bt485ClrClkDoubler(
PHW_DEVICE_EXTENSION HwDeviceExtension
)
/*++
routine description:
Disable the DAC's internal clock doubler.
arguments:
hwdeviceextension - pointer to the miniport driver's device extension.
return value:
--*/
{
UCHAR ucCurState;
RD_CMD_REG_3(ucCurState);
WR_CMD_REG_3(ucCurState & ~DAC_CLK_2X);
return;
}
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