reactos/drivers/multimedia/audio/sndblst.old/dma.c

204 lines
6 KiB
C
Raw Normal View History

/*
Routines to simplify the use of DMA for Sound Blaster driver
*/
#include <ntddk.h>
#include "sndblst.h"
#if 0
BOOLEAN CheckDMA(PDEVICE_EXTENSION Device)
{
// Don't forget to check for Compaq machines (they can't be configured
// manually...)
return TRUE; // for now...
// if (! CompaqBA)
// return (BOOLEAN) !((INPORT(pHw, BOARD_ID) & 0x80) && Device->DMA == 0);
// else
// {
// UCHAR CompaqPIDR;
// UCHAR Expected = (UCHAR)(Device->DMA == 0 ? 0x40 :
// Device->DMA == 1 ? 0x80 :
// 0xc0);
// CompaqPIDR = READ_PORT_UCHAR(pHw->CompaqBA + BOARD_ID);
// if (CompaqPIDR != 0xff)
// {
// if ((UCHAR)(CompaqPIDR & 0xc0) == Expected)
// return true;
// }
// }
return FALSE;
}
#endif
static IO_ALLOCATION_ACTION NTAPI SoundProgramDMA(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID MapRegisterBase,
IN PVOID Context)
{
PDEVICE_EXTENSION Device = DeviceObject->DeviceExtension;
ULONG zzz;
PUCHAR VirtualAddress = (PUCHAR) MmGetMdlVirtualAddress(Device->Mdl);
DPRINT("IoMapTransfer\n");
IoMapTransfer(Device->Adapter,
Device->Mdl,
MapRegisterBase,
(PUCHAR) MmGetMdlVirtualAddress(Device->Mdl),
&Device->BufferSize, // is this right?
TRUE);
DPRINT("VBuffer == 0x%x (really 0x%x?) Bufsize == %u\n", Device->VirtualBuffer, MmGetPhysicalAddress(Device->VirtualBuffer), Device->BufferSize);
DPRINT("Writing %u bytes of garbage...\n", Device->BufferSize);
// Write some garbage:
for (zzz = 0; zzz < Device->BufferSize; zzz ++)
*(VirtualAddress + zzz) = (UCHAR) zzz % 200;
DPRINT("done\n");
KeSetEvent(Context, 0, FALSE);
return KeepObject;
}
BOOLEAN CreateDMA(PDEVICE_OBJECT DeviceObject)
{
DEVICE_DESCRIPTION Desc;
ULONG MappedRegs = 0;
PDEVICE_EXTENSION Device = DeviceObject->DeviceExtension;
KEVENT DMAEvent;
KIRQL OldIrql;
// Buffersize should already be set but it isn't yet !
Device->BufferSize = SB_BUFSIZE;
DPRINT("Bufsize == %u\n", Device->BufferSize);
RtlZeroMemory(&Desc, sizeof(DEVICE_DESCRIPTION));
// Init memory!
Desc.Version = DEVICE_DESCRIPTION_VERSION;
Desc.Master = FALSE; // Slave
Desc.ScatterGather = FALSE; // Don't think so anyway
Desc.DemandMode = FALSE; // == !SingleModeDMA
Desc.AutoInitialize = TRUE; // ?
Desc.Dma32BitAddresses = FALSE; // I don't think we can
Desc.IgnoreCount = FALSE; // Should be OK
Desc.Reserved1 = 0;
// Desc.Reserved2 = 0;
Desc.BusNumber = 0;
Desc.DmaChannel = Device->DMA; // Our channel :)
Desc.InterfaceType = Isa; // (BusType == MicroChannel) ? MicroChannel : Isa;
Desc.DmaWidth = 0; // hmm... 8 bits?
Desc.DmaSpeed = 0; // double hmm (Compatible it should be)
Desc.MaximumLength = Device->BufferSize;
// Desc.MinimumLength = 0;
Desc.DmaPort = 0;
DPRINT("Calling HalGetAdapter(), asking for %d mapped regs\n", MappedRegs);
Device->Adapter = HalGetAdapter(&Desc, &MappedRegs);
DPRINT("Called\n");
if (! Device->Adapter)
{
DPRINT("HalGetAdapter() FAILED\n");
return FALSE;
}
DPRINT("Bufsize == %u\n", Device->BufferSize);
if (MappedRegs < BYTES_TO_PAGES(Device->BufferSize))
{
DPRINT("Could only allocate %u mapping registers\n", MappedRegs);
if (MappedRegs == 0)
return FALSE;
Device->BufferSize = MappedRegs * PAGE_SIZE;
DPRINT("Bufsize == %u\n", Device->BufferSize);
}
DPRINT("Allocated %u mapping registers\n", MappedRegs);
// Check if we already have memory here...
// Check to make sure we're >= minimum
DPRINT("Allocating buffer\n");
DPRINT("Bufsize == %u\n", Device->BufferSize);
Device->VirtualBuffer = HalAllocateCommonBuffer(Device->Adapter, Device->BufferSize,
&Device->Buffer, FALSE);
// For some reason BufferSize == 0 here?!
// DPRINT("Buffer == 0x%x Bufsize == %u\n", Device->Buffer, Device->BufferSize);
DPRINT("Bufsize == %u,", Device->BufferSize);
DPRINT("Buffer == 0x%x\n", Device->Buffer);
if (! Device->VirtualBuffer)
{
DPRINT("Could not allocate buffer :(\n");
// should try again with smaller buffer...
return FALSE;
}
// DPRINT("Buffer == 0x%x Bufsize == %u\n", Device->Buffer, Device->BufferSize);
DPRINT("Bufsize == %u,", Device->BufferSize);
DPRINT("Buffer == 0x%x\n", Device->Buffer);
DPRINT("Calling IoAllocateMdl()\n");
Device->Mdl = IoAllocateMdl(Device->VirtualBuffer, Device->BufferSize, FALSE, FALSE, NULL);
DPRINT("Bufsize == %u\n", Device->BufferSize);
// IS THIS RIGHT:
if (! Device->Mdl)
{
DPRINT("IoAllocateMdl() FAILED\n");
// Free the HAL buffer
return FALSE;
}
DPRINT("VBuffer == 0x%x Mdl == %u Bufsize == %u\n", Device->VirtualBuffer, Device->Mdl, Device->BufferSize);
DPRINT("Calling MmBuildMdlForNonPagedPool\n");
MmBuildMdlForNonPagedPool(Device->Mdl);
DPRINT("Bufsize == %u\n", Device->BufferSize);
// part II:
KeInitializeEvent(&DMAEvent, SynchronizationEvent, FALSE);
// Raise IRQL
KeRaiseIrql(DISPATCH_LEVEL,&OldIrql);
IoAllocateAdapterChannel(Device->Adapter, DeviceObject,
BYTES_TO_PAGES(Device->BufferSize),
SoundProgramDMA, &DMAEvent);
// Lower IRQL
KeLowerIrql(OldIrql);
DPRINT("VBuffer == 0x%x Bufsize == %u\n", Device->VirtualBuffer, Device->BufferSize);
KeWaitForSingleObject(&DMAEvent, Executive, KernelMode, FALSE, NULL);
// if (MappedRegs == 0)
// MappedRegs = 2;
// else
// MappedRegs ++;
// Status = IoAllocateAdapterChannel(
// Adapter,
// DeviceObject,
// MappedRegs,
// CALLBACK,
// DeviceObject); // Context
return TRUE;
}