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/* $OpenBSD: aapic.c,v 1.7 2022/02/21 11:03:39 mpi Exp $ */
/* $NetBSD: aapic.c,v 1.3 2005/01/13 23:40:01 fvdl Exp $ */
/*
* The AMD 8131 IO APIC can hang the box when an APIC IRQ is masked.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>
#include "ioapic.h"
#if NIOAPIC > 0
extern int nioapics;
#endif
#define AMD8131_PCIX_MISC 0x40
#define AMD8131_NIOAMODE 0x00000001
#define AMD8131_IOAPIC_CTL 0x44
#define AMD8131_IOAEN 0x00000002
int aapic_match(struct device *, void *, void *);
void aapic_attach(struct device *, struct device *, void *);
struct aapic_softc {
struct device sc_dev;
};
const struct cfattach aapic_ca = {
sizeof(struct aapic_softc), aapic_match, aapic_attach
};
struct cfdriver aapic_cd = {
0, "aapic", DV_DULL
};
int
aapic_match(struct device *parent, void *match, void *aux)
{
struct pci_attach_args *pa = aux;
if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD &&
PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_8131_PCIX_IOAPIC)
return (1);
return (0);
}
void
aapic_attach(struct device *parent, struct device *self, void *aux)
{
struct pci_attach_args *pa = aux;
int bus, dev, func;
pcitag_t tag;
pcireg_t reg;
printf("\n");
#if NIOAPIC > 0
if (nioapics == 0)
return;
#else
return;
#endif
reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMD8131_IOAPIC_CTL);
reg |= AMD8131_IOAEN;
pci_conf_write(pa->pa_pc, pa->pa_tag, AMD8131_IOAPIC_CTL, reg);
pci_decompose_tag(pa->pa_pc, pa->pa_tag, &bus, &dev, &func);
func = 0;
tag = pci_make_tag(pa->pa_pc, bus, dev, func);
reg = pci_conf_read(pa->pa_pc, tag, AMD8131_PCIX_MISC);
reg &= ~AMD8131_NIOAMODE;
pci_conf_write(pa->pa_pc, tag, AMD8131_PCIX_MISC, reg);
}
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