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