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

   1 /*
   2     Routines to simplify the use of DMA for Sound Blaster driver
   3 */
   4
   5 #include <ntddk.h>
   6 #include "sndblst.h"
   7
   8 #if 0
   9 BOOLEAN CheckDMA(PDEVICE_EXTENSION Device)
  10 {
  11     // Don't forget to check for Compaq machines (they can't be configured
  12     // manually...)
  13
  14     return TRUE;    // for now...
  15
  16 // if (! CompaqBA)
  17 // return (BOOLEAN) !((INPORT(pHw, BOARD_ID) & 0x80) && Device->DMA == 0);
  18 // else
  19 // {
  20 //    UCHAR CompaqPIDR;
  21 //    UCHAR Expected = (UCHAR)(Device->DMA == 0 ? 0x40 :
  22 //                             Device->DMA == 1 ? 0x80 :
  23 //                             0xc0);
  24 // CompaqPIDR = READ_PORT_UCHAR(pHw->CompaqBA + BOARD_ID);
  25 // if (CompaqPIDR != 0xff)
  26 // {
  27 //    if ((UCHAR)(CompaqPIDR & 0xc0) == Expected)
  28 //        return true;
  29 // }
  30 // }
  31
  32     return FALSE;
  33 }
  34 #endif
  35
  36
  37 static IO_ALLOCATION_ACTION NTAPI SoundProgramDMA(
  38     IN PDEVICE_OBJECT DeviceObject,
  39     IN PIRP Irp,
  40     IN PVOID MapRegisterBase,
  41     IN PVOID Context)
  42 {
  43     PDEVICE_EXTENSION Device = DeviceObject->DeviceExtension;
  44     ULONG zzz;
  45     PUCHAR VirtualAddress = (PUCHAR) MmGetMdlVirtualAddress(Device->Mdl);
  46
  47     DPRINT("IoMapTransfer\n");
  48     IoMapTransfer(Device->Adapter,
  49                     Device->Mdl,
  50                     MapRegisterBase,
  51                     (PUCHAR) MmGetMdlVirtualAddress(Device->Mdl),
  52                     &Device->BufferSize,    // is this right?
  53                     TRUE);
  54
  55     DPRINT("VBuffer == 0x%x (really 0x%x?) Bufsize == %u\n", Device->VirtualBuffer, MmGetPhysicalAddress(Device->VirtualBuffer), Device->BufferSize);
  56
  57     DPRINT("Writing %u bytes of garbage...\n", Device->BufferSize);
  58     // Write some garbage:
  59     for (zzz = 0; zzz < Device->BufferSize; zzz ++)
  60         *(VirtualAddress + zzz) = (UCHAR) zzz % 200;
  61
  62     DPRINT("done\n");
  63
  64     KeSetEvent(Context, 0, FALSE);
  65
  66     return KeepObject;
  67 }
  68
  69
  70 BOOLEAN CreateDMA(PDEVICE_OBJECT DeviceObject)
  71 {
  72     DEVICE_DESCRIPTION Desc;
  73     ULONG MappedRegs = 0;
  74     PDEVICE_EXTENSION Device = DeviceObject->DeviceExtension;
  75     KEVENT DMAEvent;
  76     KIRQL OldIrql;
  77
  78     // Buffersize should already be set but it isn't yet !
  79     Device->BufferSize = SB_BUFSIZE;
  80     DPRINT("Bufsize == %u\n", Device->BufferSize);
  81
  82     RtlZeroMemory(&Desc, sizeof(DEVICE_DESCRIPTION));
  83
  84     // Init memory!
  85     Desc.Version = DEVICE_DESCRIPTION_VERSION;
  86     Desc.Master = FALSE;    // Slave
  87     Desc.ScatterGather = FALSE; // Don't think so anyway
  88     Desc.DemandMode = FALSE;    // == !SingleModeDMA
  89     Desc.AutoInitialize = TRUE; // ?
  90     Desc.Dma32BitAddresses = FALSE; // I don't think we can
  91     Desc.IgnoreCount = FALSE; // Should be OK
  92     Desc.Reserved1 = 0;
  93 //    Desc.Reserved2 = 0;
  94     Desc.BusNumber = 0;
  95     Desc.DmaChannel = Device->DMA;    // Our channel :)
  96     Desc.InterfaceType = Isa;   // (BusType == MicroChannel) ? MicroChannel : Isa;
  97     Desc.DmaWidth = 0;    // hmm... 8 bits?
  98     Desc.DmaSpeed = 0;     // double hmm (Compatible it should be)
  99     Desc.MaximumLength = Device->BufferSize;
 100 //    Desc.MinimumLength = 0;
 101     Desc.DmaPort = 0;
 102
 103     DPRINT("Calling HalGetAdapter(), asking for %d mapped regs\n", MappedRegs);
 104
 105     Device->Adapter = HalGetAdapter(&Desc, &MappedRegs);
 106
 107     DPRINT("Called\n");
 108
 109     if (! Device->Adapter)
 110     {
 111         DPRINT("HalGetAdapter() FAILED\n");
 112         return FALSE;
 113     }
 114
 115     DPRINT("Bufsize == %u\n", Device->BufferSize);
 116
 117     if (MappedRegs < BYTES_TO_PAGES(Device->BufferSize))
 118     {
 119         DPRINT("Could only allocate %u mapping registers\n", MappedRegs);
 120
 121         if (MappedRegs == 0)
 122             return FALSE;
 123
 124         Device->BufferSize = MappedRegs * PAGE_SIZE;
 125         DPRINT("Bufsize == %u\n", Device->BufferSize);
 126     }
 127
 128     DPRINT("Allocated %u mapping registers\n", MappedRegs);
 129
 130     // Check if we already have memory here...
 131
 132     // Check to make sure we're >= minimum
 133
 134     DPRINT("Allocating buffer\n");
 135
 136     DPRINT("Bufsize == %u\n", Device->BufferSize);
 137
 138     Device->VirtualBuffer = HalAllocateCommonBuffer(Device->Adapter, Device->BufferSize,
 139                                                 &Device->Buffer, FALSE);
 140
 141     // For some reason BufferSize == 0 here?!
 142 //    DPRINT("Buffer == 0x%x Bufsize == %u\n", Device->Buffer, Device->BufferSize);
 143     DPRINT("Bufsize == %u,", Device->BufferSize);
 144     DPRINT("Buffer == 0x%x\n", Device->Buffer);
 145
 146     if (! Device->VirtualBuffer)
 147     {
 148         DPRINT("Could not allocate buffer :(\n");
 149         // should try again with smaller buffer...
 150         return FALSE;
 151     }
 152
 153 //    DPRINT("Buffer == 0x%x Bufsize == %u\n", Device->Buffer, Device->BufferSize);
 154     DPRINT("Bufsize == %u,", Device->BufferSize);
 155     DPRINT("Buffer == 0x%x\n", Device->Buffer);
 156
 157     DPRINT("Calling IoAllocateMdl()\n");
 158     Device->Mdl = IoAllocateMdl(Device->VirtualBuffer, Device->BufferSize, FALSE, FALSE, NULL);
 159     DPRINT("Bufsize == %u\n", Device->BufferSize);
 160
 161     // IS THIS RIGHT:
 162     if (! Device->Mdl)
 163     {
 164         DPRINT("IoAllocateMdl() FAILED\n");
 165         // Free the HAL buffer
 166         return FALSE;
 167     }
 168
 169     DPRINT("VBuffer == 0x%x Mdl == %u Bufsize == %u\n", Device->VirtualBuffer, Device->Mdl, Device->BufferSize);
 170
 171     DPRINT("Calling MmBuildMdlForNonPagedPool\n");
 172     MmBuildMdlForNonPagedPool(Device->Mdl);
 173
 174     DPRINT("Bufsize == %u\n", Device->BufferSize);
 175
 176     // part II:
 177     KeInitializeEvent(&DMAEvent, SynchronizationEvent, FALSE);
 178     // Raise IRQL
 179     KeRaiseIrql(DISPATCH_LEVEL,&OldIrql);
 180     IoAllocateAdapterChannel(Device->Adapter, DeviceObject,
 181                             BYTES_TO_PAGES(Device->BufferSize),
 182                             SoundProgramDMA, &DMAEvent);
 183     // Lower IRQL
 184     KeLowerIrql(OldIrql);
 185     DPRINT("VBuffer == 0x%x Bufsize == %u\n", Device->VirtualBuffer, Device->BufferSize);
 186     KeWaitForSingleObject(&DMAEvent, Executive, KernelMode, FALSE, NULL);
 187
 188
 189 //    if (MappedRegs == 0)
 190 //        MappedRegs = 2;
 191 //    else
 192 //        MappedRegs ++;
 193
 194
 195 //    Status = IoAllocateAdapterChannel(
 196 //                    Adapter,
 197 //                    DeviceObject,
 198 //                    MappedRegs,
 199 //                    CALLBACK,
 200 //                    DeviceObject); // Context
 201     return TRUE;
 202 }
 203