xref: /src/sys/arch/x86/pci/aapic.c

/* 	$NetBSD: aapic.c,v 1.2 2004/04/23 21:13:06 itojun Exp $	*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: aapic.c,v 1.2 2004/04/23 21:13:06 itojun Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>

#include <arch/x86/pci/amd8131reg.h>

static int	aapic_match __P((struct device *, struct cfdata *, void *));
static void	aapic_attach __P((struct device *, struct device *, void *));

struct aapic_softc {
	struct device sc_dev;
};

CFATTACH_DECL(aapic, sizeof(struct aapic_softc),
    aapic_match, aapic_attach, NULL, NULL);

static int
aapic_match(parent, match, aux)
	struct device *parent;
	struct cfdata *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_PCIX8131_APIC)
		return (1);

	return (0);
}

static void
aapic_attach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct pci_attach_args *pa = aux;
	char devinfo[256];
	int bus, dev, func, rev;
	pcitag_t tag;
	pcireg_t reg;

	pci_devinfo(pa->pa_id, pa->pa_class, 0, devinfo, sizeof(devinfo));
	rev = PCI_REVISION(pa->pa_class);
	printf(": %s (rev. 0x%02x)\n", devinfo, rev);

	reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMD8131_IOAPIC_CTL);
	if ((reg & AMD8131_IOAEN) == 0) {
		reg |= AMD8131_IOAEN;
		pci_conf_write(pa->pa_pc, pa->pa_tag, AMD8131_IOAPIC_CTL, reg);
	}

	/*
	 * Work around erratum #22 for A0 and B0 revisions.
	 */
	if (rev == 0x01 || rev == 0x11) {
		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 &= ~0x00000001;
		pci_conf_write(pa->pa_pc, tag, AMD8131_PCIX_MISC, reg);
	}
}