void dc_dbg_init()
{
#ifdef DBG_COM
u32 divisor;
u8 lcr;
/* set baud rate and data format (8N1) */
/* turn on DTR and RTS */
WRITE_PORT_UCHAR(pv(SER_MCR(COM_BASE)), SR_MCR_DTR | SR_MCR_RTS);
/* set DLAB */
lcr = READ_PORT_UCHAR(pv(SER_LCR(COM_BASE))) | SR_LCR_DLAB;
WRITE_PORT_UCHAR(pv(SER_LCR(COM_BASE)), lcr);
/* set baud rate */
divisor = 115200 / DEFAULT_BAUD_RATE;
WRITE_PORT_UCHAR(pv(SER_DLL(COM_BASE)), divisor & 0xff);
WRITE_PORT_UCHAR(pv(SER_DLM(COM_BASE)), (divisor >> 8) & 0xff);
/* reset DLAB and set 8N1 format */
WRITE_PORT_UCHAR(pv(SER_LCR(COM_BASE)),
SR_LCR_CS8 | SR_LCR_ST1 | SR_LCR_PNO);
/* read junk out of the RBR */
READ_PORT_UCHAR(pv(SER_RBR(COM_BASE)));
#endif /* DBG_COM */
#ifdef DBG_HAL_DISPLAY
InbvAcquireDisplayOwnership();
InbvEnableDisplayString(TRUE);
#endif /* DBG_HAL_DISPLAY */
}
NTSTATUS NTAPI
SerialDeviceControl(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp)
{
PIO_STACK_LOCATION Stack;
ULONG IoControlCode;
PSERIAL_DEVICE_EXTENSION DeviceExtension;
ULONG LengthIn, LengthOut;
ULONG_PTR Information = 0;
PVOID BufferIn, BufferOut;
PUCHAR ComPortBase;
NTSTATUS Status;
TRACE_(SERIAL, "IRP_MJ_DEVICE_CONTROL dispatch\n");
Stack = IoGetCurrentIrpStackLocation(Irp);
LengthIn = Stack->Parameters.DeviceIoControl.InputBufferLength;
LengthOut = Stack->Parameters.DeviceIoControl.OutputBufferLength;
DeviceExtension = (PSERIAL_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
ComPortBase = ULongToPtr(DeviceExtension->BaseAddress);
IoControlCode = Stack->Parameters.DeviceIoControl.IoControlCode;
SerialGetUserBuffers(Irp, IoControlCode, &BufferIn, &BufferOut);
/* FIXME: need to probe buffers */
/* FIXME: see http://www.osronline.com/ddkx/serial/serref_61bm.htm */
switch (IoControlCode)
{
case IOCTL_SERIAL_CLEAR_STATS:
{
TRACE_(SERIAL, "IOCTL_SERIAL_CLEAR_STATS\n");
KeSynchronizeExecution(
DeviceExtension->Interrupt,
(PKSYNCHRONIZE_ROUTINE)SerialClearPerfStats,
DeviceExtension);
Status = STATUS_SUCCESS;
break;
}
case IOCTL_SERIAL_CLR_DTR:
{
TRACE_(SERIAL, "IOCTL_SERIAL_CLR_DTR\n");
/* FIXME: If the handshake flow control of the device is configured to
* automatically use DTR, return STATUS_INVALID_PARAMETER */
Status = IoAcquireRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
if (NT_SUCCESS(Status))
{
DeviceExtension->MCR &= ~SR_MCR_DTR;
WRITE_PORT_UCHAR(SER_MCR(ComPortBase), DeviceExtension->MCR);
IoReleaseRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
}
break;
}
case IOCTL_SERIAL_CLR_RTS:
{
TRACE_(SERIAL, "IOCTL_SERIAL_CLR_RTS\n");
/* FIXME: If the handshake flow control of the device is configured to
* automatically use RTS, return STATUS_INVALID_PARAMETER */
Status = IoAcquireRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
if (NT_SUCCESS(Status))
{
DeviceExtension->MCR &= ~SR_MCR_RTS;
WRITE_PORT_UCHAR(SER_MCR(ComPortBase), DeviceExtension->MCR);
IoReleaseRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
}
break;
}
case IOCTL_SERIAL_CONFIG_SIZE:
{
/* Obsolete on Microsoft Windows 2000+ */
PULONG pConfigSize;
TRACE_(SERIAL, "IOCTL_SERIAL_CONFIG_SIZE\n");
if (LengthOut != sizeof(ULONG) || BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
pConfigSize = (PULONG)BufferOut;
*pConfigSize = 0;
Information = sizeof(ULONG);
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_GET_BAUD_RATE:
{
TRACE_(SERIAL, "IOCTL_SERIAL_GET_BAUD_RATE\n");
if (LengthOut < sizeof(SERIAL_BAUD_RATE))
Status = STATUS_BUFFER_TOO_SMALL;
else if (BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
((PSERIAL_BAUD_RATE)BufferOut)->BaudRate = DeviceExtension->BaudRate;
Information = sizeof(SERIAL_BAUD_RATE);
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_GET_CHARS:
{
/* FIXME */
PSERIAL_CHARS pSerialChars;
ERR_(SERIAL, "IOCTL_SERIAL_GET_CHARS not implemented.\n");
if (LengthOut < sizeof(SERIAL_CHARS))
Status = STATUS_BUFFER_TOO_SMALL;
else if (BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
pSerialChars = (PSERIAL_CHARS)BufferOut;
pSerialChars->EofChar = 0;
pSerialChars->ErrorChar = 0;
pSerialChars->BreakChar = 0;
pSerialChars->EventChar = 0;
pSerialChars->XonChar = 0;
pSerialChars->XoffChar = 0;
Information = sizeof(SERIAL_CHARS);
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_GET_COMMSTATUS:
{
TRACE_(SERIAL, "IOCTL_SERIAL_GET_COMMSTATUS\n");
if (LengthOut < sizeof(SERIAL_STATUS))
Status = STATUS_BUFFER_TOO_SMALL;
else if (BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
Status = SerialGetCommStatus((PSERIAL_STATUS)BufferOut, DeviceExtension);
Information = sizeof(SERIAL_STATUS);
}
break;
}
case IOCTL_SERIAL_GET_DTRRTS:
{
PULONG pDtrRts;
TRACE_(SERIAL, "IOCTL_SERIAL_GET_DTRRTS\n");
if (LengthOut != sizeof(ULONG) || BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
pDtrRts = (PULONG)BufferOut;
*pDtrRts = 0;
if (DeviceExtension->MCR & SR_MCR_DTR)
*pDtrRts |= SERIAL_DTR_STATE;
if (DeviceExtension->MCR & SR_MCR_RTS)
*pDtrRts |= SERIAL_RTS_STATE;
Information = sizeof(ULONG);
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_GET_HANDFLOW:
{
/* FIXME */
PSERIAL_HANDFLOW pSerialHandflow;
ERR_(SERIAL, "IOCTL_SERIAL_GET_HANDFLOW not implemented.\n");
if (LengthOut < sizeof(SERIAL_HANDFLOW))
Status = STATUS_BUFFER_TOO_SMALL;
else if (BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
pSerialHandflow = (PSERIAL_HANDFLOW)BufferOut;
pSerialHandflow->ControlHandShake = 0;
pSerialHandflow->FlowReplace = 0;
pSerialHandflow->XonLimit = 0;
pSerialHandflow->XoffLimit = 0;
Information = sizeof(SERIAL_HANDFLOW);
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_GET_LINE_CONTROL:
{
TRACE_(SERIAL, "IOCTL_SERIAL_GET_LINE_CONTROL\n");
if (LengthOut < sizeof(SERIAL_LINE_CONTROL))
Status = STATUS_BUFFER_TOO_SMALL;
else if (BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
*((PSERIAL_LINE_CONTROL)BufferOut) = DeviceExtension->SerialLineControl;
Information = sizeof(SERIAL_LINE_CONTROL);
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_GET_MODEM_CONTROL:
{
PULONG pMCR;
TRACE_(SERIAL, "IOCTL_SERIAL_GET_MODEM_CONTROL\n");
if (LengthOut != sizeof(ULONG) || BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
pMCR = (PULONG)BufferOut;
*pMCR = DeviceExtension->MCR;
Information = sizeof(ULONG);
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_GET_MODEMSTATUS:
{
PULONG pMSR;
TRACE_(SERIAL, "IOCTL_SERIAL_GET_MODEMSTATUS\n");
if (LengthOut != sizeof(ULONG) || BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
pMSR = (PULONG)BufferOut;
*pMSR = DeviceExtension->MSR;
Information = sizeof(ULONG);
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_GET_PROPERTIES:
{
TRACE_(SERIAL, "IOCTL_SERIAL_GET_PROPERTIES\n");
if (LengthOut < sizeof(SERIAL_COMMPROP))
Status = STATUS_BUFFER_TOO_SMALL;
else if (BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
Status = SerialGetCommProp((PSERIAL_COMMPROP)BufferOut, DeviceExtension);
Information = sizeof(SERIAL_COMMPROP);
}
break;
}
case IOCTL_SERIAL_GET_STATS:
{
TRACE_(SERIAL, "IOCTL_SERIAL_GET_STATS\n");
if (LengthOut < sizeof(SERIALPERF_STATS))
Status = STATUS_BUFFER_TOO_SMALL;
else if (BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
KeSynchronizeExecution(DeviceExtension->Interrupt,
(PKSYNCHRONIZE_ROUTINE)SerialGetPerfStats, Irp);
Information = sizeof(SERIALPERF_STATS);
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_GET_TIMEOUTS:
{
TRACE_(SERIAL, "IOCTL_SERIAL_GET_TIMEOUTS\n");
if (LengthOut != sizeof(SERIAL_TIMEOUTS) || BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
*(PSERIAL_TIMEOUTS)BufferOut = DeviceExtension->SerialTimeOuts;
Information = sizeof(SERIAL_TIMEOUTS);
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_GET_WAIT_MASK:
{
PULONG pWaitMask;
TRACE_(SERIAL, "IOCTL_SERIAL_GET_WAIT_MASK\n");
if (LengthOut != sizeof(ULONG) || BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
pWaitMask = (PULONG)BufferOut;
*pWaitMask = DeviceExtension->WaitMask;
Information = sizeof(ULONG);
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_IMMEDIATE_CHAR:
{
/* FIXME */
ERR_(SERIAL, "IOCTL_SERIAL_IMMEDIATE_CHAR not implemented.\n");
Status = STATUS_NOT_IMPLEMENTED;
break;
}
case IOCTL_SERIAL_LSRMST_INSERT:
{
/* FIXME */
ERR_(SERIAL, "IOCTL_SERIAL_LSRMST_INSERT not implemented.\n");
Status = STATUS_NOT_IMPLEMENTED;
break;
}
case IOCTL_SERIAL_PURGE:
{
KIRQL Irql;
TRACE_(SERIAL, "IOCTL_SERIAL_PURGE\n");
/* FIXME: SERIAL_PURGE_RXABORT and SERIAL_PURGE_TXABORT
* should stop current request */
if (LengthIn != sizeof(ULONG) || BufferIn == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
ULONG PurgeMask = *(PULONG)BufferIn;
Status = STATUS_SUCCESS;
/* FIXME: use SERIAL_PURGE_RXABORT and SERIAL_PURGE_TXABORT flags */
if (PurgeMask & SERIAL_PURGE_RXCLEAR)
{
KeAcquireSpinLock(&DeviceExtension->InputBufferLock, &Irql);
DeviceExtension->InputBuffer.ReadPosition = DeviceExtension->InputBuffer.WritePosition = 0;
if (DeviceExtension->UartType >= Uart16550A)
{
/* Clear also Uart FIFO */
Status = IoAcquireRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
if (NT_SUCCESS(Status))
{
WRITE_PORT_UCHAR(SER_FCR(ComPortBase), SR_FCR_CLEAR_RCVR);
IoReleaseRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
}
}
KeReleaseSpinLock(&DeviceExtension->InputBufferLock, Irql);
}
if (PurgeMask & SERIAL_PURGE_TXCLEAR)
{
KeAcquireSpinLock(&DeviceExtension->OutputBufferLock, &Irql);
DeviceExtension->OutputBuffer.ReadPosition = DeviceExtension->OutputBuffer.WritePosition = 0;
if (DeviceExtension->UartType >= Uart16550A)
{
/* Clear also Uart FIFO */
Status = IoAcquireRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
if (NT_SUCCESS(Status))
{
WRITE_PORT_UCHAR(SER_FCR(ComPortBase), SR_FCR_CLEAR_XMIT);
IoReleaseRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
}
}
KeReleaseSpinLock(&DeviceExtension->OutputBufferLock, Irql);
}
}
break;
}
case IOCTL_SERIAL_RESET_DEVICE:
{
/* FIXME */
ERR_(SERIAL, "IOCTL_SERIAL_RESET_DEVICE not implemented.\n");
Status = STATUS_NOT_IMPLEMENTED;
break;
}
case IOCTL_SERIAL_SET_BAUD_RATE:
{
PULONG pNewBaudRate;
TRACE_(SERIAL, "IOCTL_SERIAL_SET_BAUD_RATE\n");
if (LengthIn != sizeof(ULONG) || BufferIn == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
pNewBaudRate = (PULONG)BufferIn;
Status = SerialSetBaudRate(DeviceExtension, *pNewBaudRate);
}
break;
}
case IOCTL_SERIAL_SET_BREAK_OFF:
{
/* FIXME */
ERR_(SERIAL, "IOCTL_SERIAL_SET_BREAK_OFF not implemented.\n");
Status = STATUS_NOT_IMPLEMENTED;
break;
}
case IOCTL_SERIAL_SET_BREAK_ON:
{
/* FIXME */
ERR_(SERIAL, "IOCTL_SERIAL_SET_BREAK_ON not implemented.\n");
Status = STATUS_NOT_IMPLEMENTED;
break;
}
case IOCTL_SERIAL_SET_CHARS:
{
/* FIXME */
ERR_(SERIAL, "IOCTL_SERIAL_SET_CHARS not implemented.\n");
Status = STATUS_SUCCESS;
break;
}
case IOCTL_SERIAL_SET_DTR:
{
/* FIXME: If the handshake flow control of the device is configured to
* automatically use DTR, return STATUS_INVALID_PARAMETER */
TRACE_(SERIAL, "IOCTL_SERIAL_SET_DTR\n");
if (!(DeviceExtension->MCR & SR_MCR_DTR))
{
Status = IoAcquireRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
if (NT_SUCCESS(Status))
{
DeviceExtension->MCR |= SR_MCR_DTR;
WRITE_PORT_UCHAR(SER_MCR(ComPortBase), DeviceExtension->MCR);
IoReleaseRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
}
}
else
Status = STATUS_SUCCESS;
break;
}
case IOCTL_SERIAL_SET_FIFO_CONTROL:
{
TRACE_(SERIAL, "IOCTL_SERIAL_SET_FIFO_CONTROL\n");
if (LengthIn != sizeof(ULONG) || BufferIn == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
Status = IoAcquireRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
if (NT_SUCCESS(Status))
{
WRITE_PORT_UCHAR(SER_FCR(ComPortBase), (UCHAR)((*(PULONG)BufferIn) & 0xff));
IoReleaseRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
}
}
break;
}
case IOCTL_SERIAL_SET_HANDFLOW:
{
/* FIXME */
ERR_(SERIAL, "IOCTL_SERIAL_SET_HANDFLOW not implemented.\n");
Status = STATUS_SUCCESS;
break;
}
case IOCTL_SERIAL_SET_LINE_CONTROL:
{
TRACE_(SERIAL, "IOCTL_SERIAL_SET_LINE_CONTROL\n");
if (LengthIn < sizeof(SERIAL_LINE_CONTROL))
Status = STATUS_BUFFER_TOO_SMALL;
else if (BufferIn == NULL)
Status = STATUS_INVALID_PARAMETER;
else
Status = SerialSetLineControl(DeviceExtension, (PSERIAL_LINE_CONTROL)BufferIn);
break;
}
case IOCTL_SERIAL_SET_MODEM_CONTROL:
{
PULONG pMCR;
TRACE_(SERIAL, "IOCTL_SERIAL_SET_MODEM_CONTROL\n");
if (LengthIn != sizeof(ULONG) || BufferIn == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
Status = IoAcquireRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
if (NT_SUCCESS(Status))
{
pMCR = (PULONG)BufferIn;
DeviceExtension->MCR = (UCHAR)(*pMCR & 0xff);
WRITE_PORT_UCHAR(SER_MCR(ComPortBase), DeviceExtension->MCR);
IoReleaseRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
}
}
break;
}
case IOCTL_SERIAL_SET_QUEUE_SIZE:
{
if (LengthIn < sizeof(SERIAL_QUEUE_SIZE ))
return STATUS_BUFFER_TOO_SMALL;
else if (BufferIn == NULL)
return STATUS_INVALID_PARAMETER;
else
{
KIRQL Irql;
PSERIAL_QUEUE_SIZE NewQueueSize = (PSERIAL_QUEUE_SIZE)BufferIn;
Status = STATUS_SUCCESS;
if (NewQueueSize->InSize > DeviceExtension->InputBuffer.Length)
{
KeAcquireSpinLock(&DeviceExtension->InputBufferLock, &Irql);
Status = IncreaseCircularBufferSize(&DeviceExtension->InputBuffer, NewQueueSize->InSize);
KeReleaseSpinLock(&DeviceExtension->InputBufferLock, Irql);
}
if (NT_SUCCESS(Status) && NewQueueSize->OutSize > DeviceExtension->OutputBuffer.Length)
{
KeAcquireSpinLock(&DeviceExtension->OutputBufferLock, &Irql);
Status = IncreaseCircularBufferSize(&DeviceExtension->OutputBuffer, NewQueueSize->OutSize);
KeReleaseSpinLock(&DeviceExtension->OutputBufferLock, Irql);
}
}
break;
}
case IOCTL_SERIAL_SET_RTS:
{
/* FIXME: If the handshake flow control of the device is configured to
* automatically use DTR, return STATUS_INVALID_PARAMETER */
TRACE_(SERIAL, "IOCTL_SERIAL_SET_RTS\n");
if (!(DeviceExtension->MCR & SR_MCR_RTS))
{
Status = IoAcquireRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
if (NT_SUCCESS(Status))
{
DeviceExtension->MCR |= SR_MCR_RTS;
WRITE_PORT_UCHAR(SER_MCR(ComPortBase), DeviceExtension->MCR);
IoReleaseRemoveLock(&DeviceExtension->RemoveLock, ULongToPtr(DeviceExtension->ComPort));
}
}
else
Status = STATUS_SUCCESS;
break;
}
case IOCTL_SERIAL_SET_TIMEOUTS:
{
TRACE_(SERIAL, "IOCTL_SERIAL_SET_TIMEOUTS\n");
if (LengthIn != sizeof(SERIAL_TIMEOUTS) || BufferIn == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
DeviceExtension->SerialTimeOuts = *(PSERIAL_TIMEOUTS)BufferIn;
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_SET_WAIT_MASK:
{
PULONG pWaitMask = (PULONG)BufferIn;
TRACE_(SERIAL, "IOCTL_SERIAL_SET_WAIT_MASK\n");
if (LengthIn != sizeof(ULONG) || BufferIn == NULL)
Status = STATUS_INVALID_PARAMETER;
else if (DeviceExtension->WaitOnMaskIrp) /* FIXME: Race condition ; field may be currently in modification */
{
WARN_(SERIAL, "An IRP is already currently processed\n");
Status = STATUS_INVALID_PARAMETER;
}
else
{
DeviceExtension->WaitMask = *pWaitMask;
Status = STATUS_SUCCESS;
}
break;
}
case IOCTL_SERIAL_SET_XOFF:
{
/* FIXME */
ERR_(SERIAL, "IOCTL_SERIAL_SET_XOFF not implemented.\n");
Status = STATUS_NOT_IMPLEMENTED;
break;
}
case IOCTL_SERIAL_SET_XON:
{
/* FIXME */
ERR_(SERIAL, "IOCTL_SERIAL_SET_XON not implemented.\n");
Status = STATUS_NOT_IMPLEMENTED;
break;
}
case IOCTL_SERIAL_WAIT_ON_MASK:
{
PIRP WaitingIrp;
TRACE_(SERIAL, "IOCTL_SERIAL_WAIT_ON_MASK\n");
if (LengthOut != sizeof(ULONG) || BufferOut == NULL)
Status = STATUS_INVALID_PARAMETER;
else
{
IoMarkIrpPending(Irp);
WaitingIrp = InterlockedCompareExchangePointer(
&DeviceExtension->WaitOnMaskIrp,
Irp,
NULL);
/* Check if an Irp is already pending */
if (WaitingIrp != NULL)
{
/* Unable to have a 2nd pending IRP for this IOCTL */
WARN_(SERIAL, "Unable to pend a second IRP for IOCTL_SERIAL_WAIT_ON_MASK\n");
Irp->IoStatus.Information = 0;
Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
}
return STATUS_PENDING;
}
break;
}
case IOCTL_SERIAL_XOFF_COUNTER:
{
/* FIXME */
ERR_(SERIAL, "IOCTL_SERIAL_XOFF_COUNTER not implemented.\n");
Status = STATUS_NOT_IMPLEMENTED;
break;
}
default:
{
/* Pass Irp to lower driver */
TRACE_(SERIAL, "Unknown IOCTL code 0x%x\n", Stack->Parameters.DeviceIoControl.IoControlCode);
IoSkipCurrentIrpStackLocation(Irp);
return IoCallDriver(DeviceExtension->LowerDevice, Irp);
}
}
Irp->IoStatus.Status = Status;
if (Status == STATUS_PENDING)
{
IoMarkIrpPending(Irp);
}
else
{
Irp->IoStatus.Information = Information;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
}
return Status;
}
UART_TYPE
SerialDetectUartType(
IN PUCHAR BaseAddress)
{
UCHAR Lcr, TestLcr;
UCHAR OldScr, Scr5A, ScrA5;
BOOLEAN FifoEnabled;
UCHAR NewFifoStatus;
Lcr = READ_PORT_UCHAR(SER_LCR(BaseAddress));
WRITE_PORT_UCHAR(SER_LCR(BaseAddress), Lcr ^ 0xFF);
TestLcr = READ_PORT_UCHAR(SER_LCR(BaseAddress)) ^ 0xFF;
WRITE_PORT_UCHAR(SER_LCR(BaseAddress), Lcr);
/* Accessing the LCR must work for a usable serial port */
if (TestLcr != Lcr)
return UartUnknown;
/* Ensure that all following accesses are done as required */
READ_PORT_UCHAR(SER_RBR(BaseAddress));
READ_PORT_UCHAR(SER_IER(BaseAddress));
READ_PORT_UCHAR(SER_IIR(BaseAddress));
READ_PORT_UCHAR(SER_LCR(BaseAddress));
READ_PORT_UCHAR(SER_MCR(BaseAddress));
READ_PORT_UCHAR(SER_LSR(BaseAddress));
READ_PORT_UCHAR(SER_MSR(BaseAddress));
READ_PORT_UCHAR(SER_SCR(BaseAddress));
/* Test scratch pad */
OldScr = READ_PORT_UCHAR(SER_SCR(BaseAddress));
WRITE_PORT_UCHAR(SER_SCR(BaseAddress), 0x5A);
Scr5A = READ_PORT_UCHAR(SER_SCR(BaseAddress));
WRITE_PORT_UCHAR(SER_SCR(BaseAddress), 0xA5);
ScrA5 = READ_PORT_UCHAR(SER_SCR(BaseAddress));
WRITE_PORT_UCHAR(SER_SCR(BaseAddress), OldScr);
/* When non-functional, we have a 8250 */
if (Scr5A != 0x5A || ScrA5 != 0xA5)
return Uart8250;
/* Test FIFO type */
FifoEnabled = (READ_PORT_UCHAR(SER_IIR(BaseAddress)) & 0x80) != 0;
WRITE_PORT_UCHAR(SER_FCR(BaseAddress), SR_FCR_ENABLE_FIFO);
NewFifoStatus = READ_PORT_UCHAR(SER_IIR(BaseAddress)) & 0xC0;
if (!FifoEnabled)
WRITE_PORT_UCHAR(SER_FCR(BaseAddress), 0);
switch (NewFifoStatus)
{
case 0x00:
return Uart16450;
case 0x40:
case 0x80:
/* Not sure about this but the documentation says that 0x40
* indicates an unusable FIFO but my tests only worked
* with 0x80 */
return Uart16550;
}
/* FIFO is only functional for 16550A+ */
return Uart16550A;
}