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impulsetracker/SoundDrivers/PNP.INC

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initial work on port updated readme, new "build system," fixed some errors
2023-03-09 21:35:56 -08:00
;
; Plug and play include file. Driver needs to define PNPVENDORID and
; PNPSERIALID which will be used to identify the card.
;
; Call function PnP_Detect
;
PnP_SerialID DD 0
PnP_VendorID DD 0
PnP_ReadPort DW 0
PnP_CSN DB 0
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Proc PnP_Delay
Push AX CX
Mov CX, 180h
PnP_Delay1:
In AL, 21h
Loop PnP_Delay1
Pop CX AX
Ret
EndP PnP_Delay
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Proc PnP_WriteData
Mov DX, 279h
Out DX, AL
Mov AL, AH
Mov DH, 0Ah
Out DX, AL
Ret
EndP PnP_WriteData
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Proc PnP_ReadRegister
Mov DX, 279h
Out DX, AL
Mov DX, PnP_ReadPort
In AL, DX
Ret
EndP PnP_ReadRegister
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Proc PnP_Isolate
Mov AX, 402h
Call Pnp_WriteData ; Reset CSNs
PnP_IsolateNextCard:
Mov AX, 0003h
Call PnP_WriteData ; Wake[0]
Mov AX, PnP_ReadPort
ShL AX, 6
Xor AL, AL
Call PnP_WriteData ; Set Read Data port.
Call PnP_Delay
Call PnP_Delay
Call PnP_Delay
Call PnP_Delay
Mov AL, 1 ; Serial Isolation
Mov DX, 279h
Out DX, AL
Call PnP_Delay
Call PnP_Delay
Call PnP_Delay
Call PnP_Delay
Mov BL, 6Ah
Mov CX, 64
Mov DX, PnP_ReadPort
ClI
PnP_Isolate1:
ShR PnP_SerialID, 1
RCR PnP_VendorID, 1
Mov BH, BL
ShR BH, 1
Xor BH, BL
ShR BX, 1
In AL, DX
Mov AH, AL
Call PnP_Delay
In AL, DX
Call PnP_Delay
Cmp AX, 55AAh
JNE PnP_Isolate2
Xor BL, 80h
Or SerialNumber, 80000000h
PnP_Isolate2:
Dec CX
JNZ PnP_Isolate1
Mov CX, 8
Xor BH, BH
PnP_Isolate3:
ShR BH, 1
In AL, DX
Mov AH, AL
Call PnP_Delay
In AL, DX
Call PnP_Delay
Cmp AX, 55AAh
JNE PnP_Isolate4
Or BH, 80h
PnP_Isolate4:
Dec CX
JNZ PnP_Isolate3
Cmp BL, BH ; Matching Checksum?
JNE PnP_IsolateFinished
; assign CSN
Inc PnP_CSN
Mov AL, 6
MOv AH, PnP_CSN
Call PnP_WriteData
Cmp PnP_VendorID, PNPVENDORID
JNE PnP_IsolateNextCard
Cmp PnP_SerialID, PNPSERIALID
JNE PnP_IsolateNextCard
Mov AL, 60h
Call PnP_ReadData
Mov AH, AL
Mov AL, 61h
Call PnP_ReadData ; AX = address.
Mov AL, 70h
Call PnP_ReadData ; AL[3:0] = IRQ
Mov AL, 74
Call PnP_ReadData ; AL[2:0] = DMA
Jmp PnP_IsolateNextCard
PnP_IsolateFinished:
Cmp PnP_CSN, 0
JNE PnP_IsolateEnd
StC
PnP_IsolateEnd:
Ret
EndP PnP_Isolate
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Proc Pnp_Detect ; returns carry clear if succesful
Xor AL, AL
Mov DX, 279h
Out DX, AL
Out DX, AL
Mov AL, 6Ah ; Starting value
Mov CX, 32
PnP_InitiationKeyLoop:
Out DX, AL
Mov AH, AL
ShR AH, 1
Xor AH, AL
ShR AX, 1
Dec CX
JNZ PnP_InitiationKeyLoop
; Try three ports before concluding no PnP cards: 20Fh, 27Bh, 213h
Mov PnP_ReadPort, 20Fh
Call PnP_Isolate
JNC PnP_DetectEnd
Mov PnP_ReadPort, 27Bh
Call PnP_Isolate
JNC PnP_DetectEnd
Mov PnP_ReadPort, 213h
Call PnP_Isolate
PnP_DetectEnd: ; Return PnP to wait for key state
Mov AX, 202h
Call PnP_WriteData
Ret
EndP PnP_Detect
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