147 lines
3.0 KiB
C
147 lines
3.0 KiB
C
/*++
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Copyright (c) 1993 Microsoft Corporation, Digital Equipment Corporation
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Module Name:
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pcibus.c
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Abstract:
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Platform-specific PCI bus routines
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Author:
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Eric Rehm 6-June-1995
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Environment:
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Kernel mode
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Revision History:
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--*/
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#include "halp.h"
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#include "pci.h"
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#include "pcip.h"
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#include "machdep.h"
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extern ULONG PCIMaxBus;
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PCI_CONFIGURATION_TYPES
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HalpPCIConfigCycleType (
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IN PBUS_HANDLER BusHandler
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)
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{
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PCI_CONFIGURATION_TYPES ConfigType;
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ULONG BusNumber = BusHandler->BusNumber;
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PPCIPBUSDATA BusData;
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BOOLEAN BusIsAcrossPPB;
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//
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// Get a pointer to the bus-specific data.
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//
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BusData = (PPCIPBUSDATA)BusHandler->BusData;
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//
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// Get the flag that tells use whether this is
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// a root bus or not.
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//
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BusIsAcrossPPB = BusData->BusIsAcrossPPB;
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//
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// Valid Config cycles for Bus # < PCIMaxBus
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//
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// Then, Type 1 config cycles only when bus is across
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// a PPB.
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//
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if (BusNumber < PCIMaxBus) {
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ConfigType = PciConfigType0;
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if (BusIsAcrossPPB == TRUE)
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{
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ConfigType = PciConfigType1;
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}
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} else {
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ConfigType = PciConfigTypeInvalid;
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}
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#if HALDBG
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DbgPrint("BusNumber %d BusIsAcrossPPB %d ConfigType %d\n",
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BusNumber, BusIsAcrossPPB, ConfigType);
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#endif
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return ConfigType;
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}
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VOID
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HalpPCIConfigAddr (
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IN PBUS_HANDLER BusHandler,
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IN PCI_SLOT_NUMBER Slot,
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PPCI_CFG_CYCLE_BITS pPciAddr
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)
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{
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PCI_CONFIGURATION_TYPES ConfigType;
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MC_DEVICE_ID McDevid;
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ULONG BusNumber = BusHandler->BusNumber;
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PPCIPBUSDATA BusData;
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ConfigType = HalpPCIConfigCycleType(BusHandler);
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//
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// Get a pointer to the bus-specific data.
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//
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BusData = (PPCIPBUSDATA)BusHandler->BusData;
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#if HALDBG
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DbgPrint( "PCI Config Access: Bus = %d, Device = %d, BusIsAcrossPPB %d ConfigType = %d\n",
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BusNumber, Slot.u.bits.DeviceNumber, BusData->BusIsAcrossPPB, ConfigType );
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#endif //HALDBG
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//
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// From the root bus number (a.k.a. HwBusNumber), get
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// the MC_DEVICE_ID of the IOD that we're attempting to access.
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//
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McDevid = HalpIodLogicalToPhysical[BusData->HwBusNumber];
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//
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// If this is an access to an PCI device on a root bus,
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// then we want to generate a Type 0 config cycle. To do this
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// on Rawhide, you must set BusNumber to zero.
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//
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// We know that an access is destined to a root bus when
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// when the bus being accessed is *not* across a PPB.
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//
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if (BusData->BusIsAcrossPPB == FALSE) {
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BusNumber = 0;
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}
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//
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// Initialize PciAddr for a PCI type 1 configuration cycle
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//
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pPciAddr->u.AsULONG = McDevid.all << 24;
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pPciAddr->u.bits1.BusNumber = BusNumber;
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pPciAddr->u.bits1.DeviceNumber = Slot.u.bits.DeviceNumber;
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pPciAddr->u.bits1.FunctionNumber = Slot.u.bits.FunctionNumber;
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pPciAddr->u.bits1.Reserved1 = PciConfigType1; // don't care!
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return;
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}
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