* Copyright (c) 2000 Doug Rabson

/* $NetBSD: agp_sis.c,v 1.15 2019/11/10 21:16:36 chs 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_sis.c,v 1.3 2001/07/05 21:28:47 jhb Exp $
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: agp_sis.c,v 1.15 2019/11/10 21:16:36 chs Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.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/agpvar.h>
#include <dev/pci/agpreg.h>

#include <sys/bus.h>

struct agp_sis_softc {
u_int32_t initial_aperture; /* aperture size at startup */
struct agp_gatt *gatt;
};

static u_int32_t agp_sis_get_aperture(struct agp_softc *);
static int agp_sis_set_aperture(struct agp_softc *, u_int32_t);
static int agp_sis_bind_page(struct agp_softc *, off_t, bus_addr_t);
static int agp_sis_unbind_page(struct agp_softc *, off_t);
static void agp_sis_flush_tlb(struct agp_softc *);

static struct agp_methods agp_sis_methods = {
agp_sis_get_aperture,
agp_sis_set_aperture,
agp_sis_bind_page,
agp_sis_unbind_page,
agp_sis_flush_tlb,
agp_generic_enable,
agp_generic_alloc_memory,
agp_generic_free_memory,
agp_generic_bind_memory,
agp_generic_unbind_memory,
};

int
agp_sis_attach(device_t parent, device_t self, void *aux)
{
struct agp_softc *sc = device_private(self);
struct pci_attach_args *pa = aux;
struct agp_sis_softc *ssc;
struct agp_gatt *gatt;
pcireg_t reg;

ssc = malloc(sizeof *ssc, M_AGP, M_WAITOK);
sc->as_methods = &agp_sis_methods;
sc->as_chipc = ssc;
pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff,
NULL);

if (agp_map_aperture(pa, sc, AGP_APBASE) != 0) {
aprint_error(": can't map aperture\n");
free(ssc, M_AGP);
return ENXIO;
}

ssc->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);
aprint_error(": failed to set aperture\n");
return ENOMEM;
}
}
ssc->gatt = gatt;

/* Install the gatt. */
pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_ATTBASE,
gatt->ag_physical);

/* Enable the aperture and auto-tlb-inval */
reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
reg |= (0x05 << 24) | 3;
pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);

return 0;
}

#if 0
static int
agp_sis_detach(struct agp_softc *sc)
{
struct agp_sis_softc *ssc = sc->as_chipc;
pcireg_t reg;
int error;

error = agp_generic_detach(sc);
if (error)
return error;

reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
reg &= ~3;
reg &= 0x00ffffff;
pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);

/* Put the aperture back the way it started. */
AGP_SET_APERTURE(sc, ssc->initial_aperture);

agp_free_gatt(sc, ssc->gatt);
return 0;
}
#endif

static u_int32_t
agp_sis_get_aperture(struct agp_softc *sc)
{
int gws;

/*
* The aperture size is equal to 4M<<gws.
*/
gws = (pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL)&0x70) >> 4;
return (4*1024*1024) << gws;
}

static int
agp_sis_set_aperture(struct agp_softc *sc, u_int32_t aperture)
{
int gws;
pcireg_t reg;

/*
* Check for a power of two and make sure its within the
* programmable range.
*/
if (aperture & (aperture - 1)
|| aperture < 4*1024*1024
|| aperture > 256*1024*1024)
return EINVAL;

gws = ffs(aperture / 4*1024*1024) - 1;

reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
reg &= ~0x00000070;
reg |= gws << 4;
pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);

return 0;
}

static int
agp_sis_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical)
{
struct agp_sis_softc *ssc = sc->as_chipc;

if (offset < 0 || offset >= (ssc->gatt->ag_entries << AGP_PAGE_SHIFT))
return EINVAL;

ssc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
return 0;
}

static int
agp_sis_unbind_page(struct agp_softc *sc, off_t offset)
{
struct agp_sis_softc *ssc = sc->as_chipc;

if (offset < 0 || offset >= (ssc->gatt->ag_entries << AGP_PAGE_SHIFT))
return EINVAL;

ssc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
return 0;
}

static void
agp_sis_flush_tlb(struct agp_softc *sc)
{
pcireg_t reg;

reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_TLBFLUSH);
reg &= 0xffffff00;
reg |= 0x02;
pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_TLBFLUSH, reg);
}