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111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
/*
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*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: drivers/dd/sndblst/portio.c (see also sndblst.h)
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* PURPOSE: Sound Blaster port I/O helper
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* PROGRAMMER: Andrew Greenwood
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* UPDATE HISTORY:
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* Sept 28, 2003: Created
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*/
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#include <ntddk.h>
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#include "sndblst.h"
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BOOLEAN WaitToSend(ULONG BasePort)
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{
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int TimeOut;
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DPRINT("WaitToSend ");
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// Check if it's OK to send
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for (TimeOut = SB_TIMEOUT;
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! SB_READY_TO_SEND(BasePort) && TimeOut > 0;
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TimeOut --);
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// If a time-out occurs, we report failure
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if (! TimeOut)
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{
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DPRINT("FAILED\n");
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return FALSE;
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}
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DPRINT("SUCCEEDED\n");
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return TRUE;
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}
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BOOLEAN WaitToReceive(ULONG BasePort)
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{
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int TimeOut;
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DPRINT("WaitToReceive ");
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// Check if it's OK to receive
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for (TimeOut = SB_TIMEOUT;
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! SB_READY_TO_RECEIVE(BasePort) && TimeOut > 0;
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TimeOut --);
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// If a time-out occurs, we report failure
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if (! TimeOut)
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{
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DPRINT("FAILED\n");
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return FALSE;
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}
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DPRINT("SUCCEEDED\n");
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return TRUE;
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}
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USHORT InitSoundCard(ULONG BasePort)
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{
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ULONG TimeOut;
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BOOLEAN Status;
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UCHAR DSP_Major, DSP_Minor;
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DPRINT("InitSoundCard() called\n");
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DPRINT("Resetting sound card\n");
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// if (!WaitToSend(BasePort))
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// return FALSE;
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SB_WRITE_RESET(BasePort, 0x01);
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for (TimeOut = 0; TimeOut < 30000; TimeOut ++); // Wait a while
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SB_WRITE_RESET(BasePort, 0x00);
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// Check if it's OK to receive (some cards will ignore the above reset
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// command and so will not issue an ACK, so time out is NOT an error)
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DPRINT("Waiting for an ACK\n");
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if (WaitToReceive(BasePort))
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{
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// Check to make sure the reset was acknowledged:
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for (TimeOut = SB_TIMEOUT;
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(Status = (SB_READ_DATA(BasePort) != SB_DSP_READY) && (TimeOut > 0));
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TimeOut --);
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}
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DPRINT("Querying DSP version\n");
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if (! WaitToSend(BasePort))
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return FALSE;
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SB_WRITE_DATA(BasePort, SB_GET_DSP_VERSION);
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if (! WaitToReceive(BasePort))
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return FALSE;
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DSP_Major = SB_READ_DATA(BasePort);
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DSP_Minor = SB_READ_DATA(BasePort);
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DPRINT("DSP v%d.%d\n", DSP_Major, DSP_Minor);
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// if audio is disabled,
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// version tests return 0xFF everywhere
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if (DSP_Major == 0xFF && DSP_Minor == 0xFF)
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return FALSE;
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DPRINT("Sound card initialized!\n");
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return (DSP_Major * 256) + DSP_Minor;
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}
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