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/* $OpenBSD: agp_intel.c,v 1.5 2007/10/06 23:50:54 krw Exp $ */
/* $NetBSD: agp_intel.c,v 1.3 2001/09/15 00:25:00 thorpej Exp $ */
/*-
* Copyright (c) 2000 Doug Rabson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: src/sys/pci/agp_intel.c,v 1.4 2001/07/05 21:28:47 jhb Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/proc.h>
#include <sys/agpio.h>
#include <sys/device.h>
#include <sys/agpio.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/vga_pcivar.h>
#include <dev/pci/agpvar.h>
#include <dev/pci/agpreg.h>
#include <machine/bus.h>
struct agp_intel_softc {
u_int32_t initial_aperture; /* aperture size at startup */
struct agp_gatt *gatt;
};
static u_int32_t agp_intel_get_aperture(struct vga_pci_softc *);
static int agp_intel_set_aperture(struct vga_pci_softc *, u_int32_t);
static int agp_intel_bind_page(struct vga_pci_softc *, off_t, bus_addr_t);
static int agp_intel_unbind_page(struct vga_pci_softc *, off_t);
static void agp_intel_flush_tlb(struct vga_pci_softc *);
struct agp_methods agp_intel_methods = {
agp_intel_get_aperture,
agp_intel_set_aperture,
agp_intel_bind_page,
agp_intel_unbind_page,
agp_intel_flush_tlb,
agp_generic_enable,
agp_generic_alloc_memory,
agp_generic_free_memory,
agp_generic_bind_memory,
agp_generic_unbind_memory,
};
int
agp_intel_attach(struct vga_pci_softc *sc, struct pci_attach_args *pa,
struct pci_attach_args *pchb_pa)
{
struct agp_intel_softc *isc;
struct agp_gatt *gatt;
pcireg_t reg;
isc = malloc(sizeof *isc, M_DEVBUF, M_NOWAIT | M_ZERO);
if (isc == NULL) {
printf(": can't allocate chipset-specific softc\n");
return (ENOMEM);
}
sc->sc_methods = &agp_intel_methods;
sc->sc_chipc = isc;
if (agp_map_aperture(sc, AGP_APBASE, PCI_MAPREG_TYPE_MEM) != 0) {
printf(": can't map aperture\n");
free(isc, M_DEVBUF);
sc->sc_chipc = NULL;
return (ENXIO);
}
isc->initial_aperture = AGP_GET_APERTURE(sc);
for (;;) {
gatt = agp_alloc_gatt(sc);
if (gatt)
break;
/*
* Probably contigmalloc failure. Try reducing the
* aperture so that the gatt size reduces.
*/
if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) {
agp_generic_detach(sc);
printf(": failed to set aperture\n");
return (ENOMEM);
}
}
isc->gatt = gatt;
/* Install the gatt. */
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_ATTBASE,
gatt->ag_physical);
/* Enable things, clear errors etc. */
/* XXXfvdl get rid of the magic constants */
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_AGPCTRL, 0x2280);
reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_NBXCFG);
reg &= ~(1 << 10);
reg |= (1 << 9);
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_NBXCFG, reg);
reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_STS);
reg &= ~0x00ff0000;
reg |= (7 << 16);
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_STS, reg);
return (0);
}
#if 0
static int
agp_intel_detach(struct vga_pci_softc *sc)
{
int error;
pcireg_t reg;
struct agp_intel_softc *isc = sc->sc_chipc;
error = agp_generic_detach(sc);
if (error)
return (error);
reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_NBXCFG);
reg &= ~(1 << 9);
printf("%s: set NBXCFG to %x\n", __FUNCTION__, reg);
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_NBXCFG, reg);
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_ATTBASE, 0);
AGP_SET_APERTURE(sc, isc->initial_aperture);
agp_free_gatt(sc, isc->gatt);
return (0);
}
#endif
static u_int32_t
agp_intel_get_aperture(struct vga_pci_softc *sc)
{
u_int32_t apsize;
apsize = pci_conf_read(sc->sc_pc, sc->sc_pcitag,
AGP_INTEL_APSIZE) & 0x1f;
/*
* The size is determined by the number of low bits of
* register APBASE which are forced to zero. The low 22 bits
* are always forced to zero and each zero bit in the apsize
* field just read forces the corresponding bit in the 27:22
* to be zero. We calculate the aperture size accordingly.
*/
return ((((apsize ^ 0x1f) << 22) | ((1 << 22) - 1)) + 1);
}
static int
agp_intel_set_aperture(struct vga_pci_softc *sc, u_int32_t aperture)
{
u_int32_t apsize;
pcireg_t reg;
/*
* Reverse the magic from get_aperture.
*/
apsize = ((aperture - 1) >> 22) ^ 0x1f;
/*
* Double check for sanity.
*/
if ((((apsize ^ 0x1f) << 22) | ((1 << 22) - 1)) + 1 != aperture)
return (EINVAL);
reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_APSIZE);
reg = (reg & 0xffffff00) | apsize;
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_APSIZE, reg);
return (0);
}
static int
agp_intel_bind_page(struct vga_pci_softc *sc, off_t offset, bus_addr_t physical)
{
struct agp_intel_softc *isc = sc->sc_chipc;
if (offset < 0 || offset >= (isc->gatt->ag_entries << AGP_PAGE_SHIFT))
return (EINVAL);
isc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 0x17;
return (0);
}
static int
agp_intel_unbind_page(struct vga_pci_softc *sc, off_t offset)
{
struct agp_intel_softc *isc = sc->sc_chipc;
if (offset < 0 || offset >= (isc->gatt->ag_entries << AGP_PAGE_SHIFT))
return (EINVAL);
isc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
return (0);
}
static void
agp_intel_flush_tlb(struct vga_pci_softc *sc)
{
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_AGPCTRL, 0x2200);
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_AGPCTRL, 0x2280);
}
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