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/* $OpenBSD: agp_via.c,v 1.4 2007/10/06 23:50:54 krw Exp $ */
/* $NetBSD: agp_via.c,v 1.2 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_via.c,v 1.3 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/conf.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>
static u_int32_t agp_via_get_aperture(struct vga_pci_softc *);
static int agp_via_set_aperture(struct vga_pci_softc *, u_int32_t);
static int agp_via_bind_page(struct vga_pci_softc *, off_t, bus_addr_t);
static int agp_via_unbind_page(struct vga_pci_softc *, off_t);
static void agp_via_flush_tlb(struct vga_pci_softc *);
struct agp_methods agp_via_methods = {
agp_via_get_aperture,
agp_via_set_aperture,
agp_via_bind_page,
agp_via_unbind_page,
agp_via_flush_tlb,
agp_generic_enable,
agp_generic_alloc_memory,
agp_generic_free_memory,
agp_generic_bind_memory,
agp_generic_unbind_memory,
};
struct agp_via_softc {
u_int32_t initial_aperture; /* aperture size at startup */
struct agp_gatt *gatt;
};
int
agp_via_attach(struct vga_pci_softc *sc, struct pci_attach_args *pa,
struct pci_attach_args *pchb_pa)
{
struct agp_via_softc *asc;
struct agp_gatt *gatt;
asc = malloc(sizeof *asc, M_DEVBUF, M_NOWAIT | M_ZERO);
if (asc == NULL) {
printf(": can't allocate chipset-specific softc\n");
return (ENOMEM);
}
sc->sc_chipc = asc;
sc->sc_methods = &agp_via_methods;
if (agp_map_aperture(sc, AGP_APBASE, PCI_MAPREG_TYPE_MEM) != 0) {
printf(": can't map aperture\n");
free(asc, M_DEVBUF);
return (ENXIO);
}
asc->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(": can't set aperture size\n");
return (ENOMEM);
}
}
asc->gatt = gatt;
/* Install the gatt. */
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_ATTBASE,
gatt->ag_physical | 3);
/* Enable the aperture. */
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0x0000000f);
return (0);
}
#if 0
static int
agp_via_detach(struct vga_pci_softc *sc)
{
struct agp_via_softc *asc = sc->sc_chipc;
int error;
error = agp_generic_detach(sc);
if (error)
return (error);
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0);
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_ATTBASE, 0);
AGP_SET_APERTURE(sc, asc->initial_aperture);
agp_free_gatt(sc, asc->gatt);
return (0);
}
#endif
static u_int32_t
agp_via_get_aperture(struct vga_pci_softc *sc)
{
u_int32_t apsize;
apsize = pci_conf_read(sc->sc_pc, sc->sc_pcitag,
AGP_VIA_APSIZE) & 0x1f;
/*
* The size is determined by the number of low bits of
* register APBASE which are forced to zero. The low 20 bits
* are always forced to zero and each zero bit in the apsize
* field just read forces the corresponding bit in the 27:20
* to be zero. We calculate the aperture size accordingly.
*/
return ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1);
}
static int
agp_via_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) >> 20) ^ 0xff;
/*
* Double check for sanity.
*/
if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture)
return (EINVAL);
reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_VIA_APSIZE);
reg &= ~0xff;
reg |= apsize;
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_APSIZE, reg);
return (0);
}
static int
agp_via_bind_page(struct vga_pci_softc *sc, off_t offset, bus_addr_t physical)
{
struct agp_via_softc *asc = sc->sc_chipc;
if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
return (EINVAL);
asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
return (0);
}
static int
agp_via_unbind_page(struct vga_pci_softc *sc, off_t offset)
{
struct agp_via_softc *asc = sc->sc_chipc;
if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
return (EINVAL);
asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
return (0);
}
static void
agp_via_flush_tlb(struct vga_pci_softc *sc)
{
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0x8f);
pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0x0f);
}
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