158 lines
3.4 KiB
C
158 lines
3.4 KiB
C
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/*
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* MERCURY.C - Intel Mercury PCI chipset routines.
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*
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* Notes:
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* Algorithms from Intel 82420/82430 PCISet EISA Bridge doc,
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* 82374EB/SB EISA System Component (ESC) spec.
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*
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*/
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#include "local.h"
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/****************************************************************************
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*
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* MercurySetIRQ - Set a Mercury PCI link to a specific IRQ
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*
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* Exported.
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*
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* ENTRY: bIRQNumber is the new IRQ to be used.
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*
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* bLink is the Link to be set.
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*
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* EXIT: Standard PCIMP return value.
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*
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***************************************************************************/
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PCIMPRET CDECL
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MercurySetIRQ(UCHAR bIRQNumber, UCHAR bLink)
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{
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//
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// Make link number 0 based, and validate.
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//
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bLink--;
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if (bLink > 3) {
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return(PCIMP_INVALID_LINK);
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}
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//
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// Use 0x80 to disable.
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//
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if (!bIRQNumber)
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bIRQNumber=0x80;
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//
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// Start talking to interrupt controller.
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//
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WRITE_PORT_UCHAR((PUCHAR)0x22, 0x02);
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WRITE_PORT_UCHAR((PUCHAR)0x23, 0x0f);
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//
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// Set our link to the new IRQ.
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//
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WRITE_PORT_UCHAR((PUCHAR)0x22, (UCHAR)(bLink+0x60));
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WRITE_PORT_UCHAR((PUCHAR)0x23, bIRQNumber);
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//
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// Done talking to interrupt controller.
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//
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WRITE_PORT_UCHAR((PUCHAR)0x22, 0x02);
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WRITE_PORT_UCHAR((PUCHAR)0x23, 0x00);
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return(PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* MercuryGetIRQ - Get the IRQ of a Mercury PCI link
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*
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* Exported.
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*
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* ENTRY: pbIRQNumber is the buffer to fill.
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*
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* bLink is the Link to be read.
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*
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* EXIT: Standard PCIMP return value.
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*
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***************************************************************************/
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PCIMPRET CDECL
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MercuryGetIRQ(PUCHAR pbIRQNumber, UCHAR bLink)
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{
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//
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// Make link number 0 based, and validate.
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//
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bLink--;
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if (bLink > 3) {
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return(PCIMP_INVALID_LINK);
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}
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//
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// Start talking to interrupt controller.
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//
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WRITE_PORT_UCHAR((PUCHAR)0x22, 0x02);
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WRITE_PORT_UCHAR((PUCHAR)0x23, 0x0f);
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//
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// Get our link's IRQ.
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//
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WRITE_PORT_UCHAR((PUCHAR)0x22, (UCHAR)(bLink+0x60));
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*pbIRQNumber=READ_PORT_UCHAR((PUCHAR)0x23);
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//
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// Done talking to interrupt controller.
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//
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WRITE_PORT_UCHAR((PUCHAR)0x22, 0x02);
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WRITE_PORT_UCHAR((PUCHAR)0x23, 0x00);
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//
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// Return 0 if disabled.
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//
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if (*pbIRQNumber & 0x80)
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*pbIRQNumber=0;
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return(PCIMP_SUCCESS);
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}
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/****************************************************************************
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*
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* MercuryValidateTable - Validate an IRQ table
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*
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* Exported.
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*
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* ENTRY: piihIRQInfoHeader points to an IRQInfoHeader followed
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* by an IRQ Routing Table.
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*
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* ulFlags are PCIMP_VALIDATE flags.
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*
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* EXIT: Standard PCIMP return value.
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*
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***************************************************************************/
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#ifdef ALLOC_PRAGMA
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PCIMPRET CDECL
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MercuryValidateTable(PIRQINFOHEADER piihIRQInfoHeader, ULONG ulFlags);
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#pragma alloc_text(PAGE, MercuryValidateTable)
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#endif //ALLOC_PRAGMA
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PCIMPRET CDECL
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MercuryValidateTable(PIRQINFOHEADER piihIRQInfoHeader, ULONG ulFlags)
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{
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UCHAR bMin=GetMinLink(piihIRQInfoHeader);
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UCHAR bMax=GetMaxLink(piihIRQInfoHeader);
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PAGED_CODE();
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if (bMax<=0x04) {
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return(PCIMP_SUCCESS);
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}
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if ((bMin<0x60) || (bMax>0x63)) {
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return(PCIMP_FAILURE);
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}
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NormalizeLinks(piihIRQInfoHeader, (UCHAR)(0-0x5F));
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return(PCIMP_SUCCESS);
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}
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