/*++


Copyright (C) 1989-1995  Microsoft Corporation

Module Name:

    pxpciint.c

Abstract:

    All PCI bus interrupt mapping is in this module, so that a real
    system which doesn't have all the limitations which PC PCI
    systems have can replaced this code easly.
    (bus memory & i/o address mappings can also be fix here)

Author:

    Ken Reneris
    Jim Wooldridge - Ported to PowerPC

Environment:

    Kernel mode

Revision History:


--*/

#include "halp.h"
#include "pci.h"
#include "pcip.h"


#ifdef ALLOC_PRAGMA
#pragma alloc_text(PAGE,HalpGetPCIIntOnISABus)
#pragma alloc_text(PAGE,HalpAdjustPCIResourceList)
#pragma alloc_text(PAGE,HalpGetISAFixedPCIIrq)
#endif


ULONG
HalpGetPCIIntOnISABus (
    IN PBUS_HANDLER BusHandler,
    IN PBUS_HANDLER RootHandler,
    IN ULONG BusInterruptLevel,
    IN ULONG BusInterruptVector,
    OUT PKIRQL Irql,
    OUT PKAFFINITY Affinity
    )
{
    if (BusInterruptLevel < 1) {
        // bogus bus level
        return 0;
    }


    //
    // Current PCI buses just map their IRQs ontop of the ISA space,
    // so foreward this to the isa handler for the isa vector
    // (the isa vector was saved away at either HalSetBusData or
    // IoAssignReosurces time - if someone is trying to connect a
    // PCI interrupt without performing one of those operations first,
    // they are broken).
    //

    return HalGetInterruptVector (
                Internal, 0,
                BusInterruptLevel,
                BusInterruptVector,
                Irql,
                Affinity
            );
}


VOID
HalpPCIPin2ISALine (
    IN PBUS_HANDLER          BusHandler,
    IN PBUS_HANDLER          RootHandler,
    IN PCI_SLOT_NUMBER      SlotNumber,
    IN PPCI_COMMON_CONFIG   PciData
    )
/*++

    This function maps the device's InterruptPin to an InterruptLine
    value.

    On the current PC implementations, the bios has already filled in
    InterruptLine as it's ISA value and there's no portable way to
    change it.


--*/
{
}



VOID
HalpPCIISALine2Pin (
    IN PBUS_HANDLER          BusHandler,
    IN PBUS_HANDLER          RootHandler,
    IN PCI_SLOT_NUMBER      SlotNumber,
    IN PPCI_COMMON_CONFIG   PciNewData,
    IN PPCI_COMMON_CONFIG   PciOldData
    )
/*++

    This functions maps the device's InterruptLine to it's
    device specific InterruptPin value.

    On the current PC implementations, this information is
    fixed by the BIOS.  Just make sure the value isn't being
    editted since PCI doesn't tell us how to dynically
    connect the interrupt.

--*/
{
}


NTSTATUS
HalpAdjustPCIResourceList (
    IN PBUS_HANDLER BusHandler,
    IN PBUS_HANDLER RootHandler,
    IN OUT PIO_RESOURCE_REQUIREMENTS_LIST   *pResourceList
    )
/*++
    Rewrite the callers requested resource list to fit within
    the supported ranges of this bus
--*/
{
    NTSTATUS                Status;
    PPCIPBUSDATA            BusData;
    PCI_SLOT_NUMBER         PciSlot;
    PSUPPORTED_RANGE        Interrupt;

    BusData = (PPCIPBUSDATA) BusHandler->BusData;
    PciSlot = *((PPCI_SLOT_NUMBER) &(*pResourceList)->SlotNumber);

    //
    // Determine PCI device's interrupt restrictions
    //

    Status = BusData->GetIrqRange(BusHandler, RootHandler, PciSlot, &Interrupt);

    if (!NT_SUCCESS(Status)) {
        return Status;
    }

    //
    // Adjust resources
    //

    Status = HaliAdjustResourceListRange (
                BusHandler->BusAddresses,
                Interrupt,
                pResourceList
                );

    ExFreePool (Interrupt);
    return Status;
}


NTSTATUS
HalpGetISAFixedPCIIrq (
    IN PBUS_HANDLER         BusHandler,
    IN PBUS_HANDLER         RootHandler,
    IN PCI_SLOT_NUMBER      PciSlot,
    OUT PSUPPORTED_RANGE    *Interrupt
    )
{
    UCHAR                   buffer[PCI_COMMON_HDR_LENGTH];
    PPCI_COMMON_CONFIG      PciData;


    PciData = (PPCI_COMMON_CONFIG) buffer;
    HalGetBusData (
        PCIConfiguration,
        BusHandler->BusNumber,
        PciSlot.u.AsULONG,
        PciData,
        PCI_COMMON_HDR_LENGTH
        );

    if (PciData->VendorID == PCI_INVALID_VENDORID  ||
        PCI_CONFIG_TYPE (PciData) != 0) {
        return STATUS_UNSUCCESSFUL;
    }

    *Interrupt = ExAllocatePool (PagedPool, sizeof (SUPPORTED_RANGE));
    if (!*Interrupt) {
        return STATUS_INSUFFICIENT_RESOURCES;
    }

    RtlZeroMemory (*Interrupt, sizeof (SUPPORTED_RANGE));
    (*Interrupt)->Base = 1;                 // base = 1, limit = 0

    if (!PciData->u.type0.InterruptPin) {
        return STATUS_SUCCESS;
    }

    if (PciData->u.type0.InterruptLine == 0) {
#if DBG
        DbgPrint ("HalpGetValidPCIFixedIrq: BIOS did not assign an interrupt vector for the device\n");
#endif
        //
        // We need to let the caller continue, since the caller may
        // not care that the interrupt vector is connected or not
        //

        return STATUS_SUCCESS;
    }

    (*Interrupt)->Base  = PciData->u.type0.InterruptLine;
    (*Interrupt)->Limit = PciData->u.type0.InterruptLine;
    return STATUS_SUCCESS;
}