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freebsd/sys/pci/agp_amd.c

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/*-
* 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.
*
* $FreeBSD$
*/
#include "opt_bus.h"
#include "opt_pci.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/lock.h>
#include <pci/pcivar.h>
#include <pci/pcireg.h>
#include <pci/agppriv.h>
#include <pci/agpreg.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/pmap.h>
#include <machine/clock.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#define READ2(off) bus_space_read_2(sc->bst, sc->bsh, off)
#define READ4(off) bus_space_read_4(sc->bst, sc->bsh, off)
#define WRITE2(off,v) bus_space_write_2(sc->bst, sc->bsh, off, v)
#define WRITE4(off,v) bus_space_write_4(sc->bst, sc->bsh, off, v)
struct agp_amd_softc {
struct agp_softc agp;
struct resource *regs; /* memory mapped control registers */
bus_space_tag_t bst; /* bus_space tag */
bus_space_handle_t bsh; /* bus_space handle */
u_int32_t initial_aperture; /* aperture size at startup */
struct agp_gatt *gatt;
};
static const char*
agp_amd_match(device_t dev)
{
if (pci_get_class(dev) != PCIC_BRIDGE
|| pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
return NULL;
if (agp_find_caps(dev) == 0)
return NULL;
switch (pci_get_devid(dev)) {
case 0x70061022:
return ("AMD 751 host to AGP bridge");
};
return NULL;
}
static int
agp_amd_probe(device_t dev)
{
const char *desc;
desc = agp_amd_match(dev);
if (desc) {
device_verbose(dev);
device_set_desc(dev, desc);
return 0;
}
return ENXIO;
}
static int
agp_amd_attach(device_t dev)
{
struct agp_amd_softc *sc = device_get_softc(dev);
struct agp_gatt *gatt;
int error, rid;
error = agp_generic_attach(dev);
if (error)
return error;
rid = AGP_AMD751_REGISTERS;
sc->regs = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
0, ~0, 1, RF_ACTIVE);
if (!sc->regs) {
agp_generic_detach(dev);
return ENOMEM;
}
sc->bst = rman_get_bustag(sc->regs);
sc->bsh = rman_get_bushandle(sc->regs);
sc->initial_aperture = AGP_GET_APERTURE(dev);
for (;;) {
gatt = agp_alloc_gatt(dev);
if (gatt)
break;
/*
* Probably contigmalloc failure. Try reducing the
* aperture so that the gatt size reduces.
*/
if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2))
return ENOMEM;
}
sc->gatt = gatt;
/* Install the gatt. */
WRITE4(AGP_AMD751_ATTBASE, gatt->ag_physical);
/* Enable synchronisation between host and agp. */
pci_write_config(dev, AGP_AMD751_MODECTRL, 0x80, 1);
/* Enable the TLB and flush */
WRITE2(AGP_AMD751_STATUS,
READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE);
AGP_FLUSH_TLB(dev);
return agp_generic_attach(dev);
}
static int
agp_amd_detach(device_t dev)
{
struct agp_amd_softc *sc = device_get_softc(dev);
/* Disable the TLB.. */
WRITE2(AGP_AMD751_STATUS,
READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE);
/* Disable host-agp sync */
pci_write_config(dev, AGP_AMD751_MODECTRL, 0x00, 1);
/* Clear the GATT base */
WRITE4(AGP_AMD751_ATTBASE, 0);
/* Put the aperture back the way it started. */
AGP_SET_APERTURE(dev, sc->initial_aperture);
agp_free_gatt(sc->gatt);
return 0;
}
static u_int32_t
agp_amd_get_aperture(device_t dev)
{
int vas;
/*
* The aperture size is equal to 32M<<vas.
*/
vas = (pci_read_config(dev, AGP_AMD751_APCTRL, 1) & 0x06) >> 1;
return (32*1024*1024) << vas;
}
static int
agp_amd_set_aperture(device_t dev, u_int32_t aperture)
{
int vas;
/*
* Check for a power of two and make sure its within the
* programmable range.
*/
if (aperture & (aperture - 1)
|| aperture < 32*1024*1024
|| aperture > 2U*1024*1024*1024)
return EINVAL;
vas = ffs(aperture / 32*1024*1024) - 1;
pci_write_config(dev, AGP_AMD751_APCTRL,
((pci_read_config(dev, AGP_AMD751_APCTRL, 1) & ~0x06)
| vas << 1), 1);
return 0;
}
static int
agp_amd_bind_page(device_t dev, int offset, vm_offset_t physical)
{
struct agp_amd_softc *sc = device_get_softc(dev);
if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
return EINVAL;
sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1;
return 0;
}
static int
agp_amd_unbind_page(device_t dev, int offset)
{
struct agp_amd_softc *sc = device_get_softc(dev);
if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
return EINVAL;
sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
return 0;
}
static void
agp_amd_flush_tlb(device_t dev)
{
struct agp_amd_softc *sc = device_get_softc(dev);
/* Set the cache invalidate bit and wait for the chipset to clear */
WRITE4(AGP_AMD751_TLBCTRL, 1);
do {
DELAY(1);
} while (READ4(AGP_AMD751_TLBCTRL));
}
static device_method_t agp_amd_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, agp_amd_probe),
DEVMETHOD(device_attach, agp_amd_attach),
DEVMETHOD(device_detach, agp_amd_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* AGP interface */
DEVMETHOD(agp_get_aperture, agp_amd_get_aperture),
DEVMETHOD(agp_set_aperture, agp_amd_set_aperture),
DEVMETHOD(agp_bind_page, agp_amd_bind_page),
DEVMETHOD(agp_unbind_page, agp_amd_unbind_page),
DEVMETHOD(agp_flush_tlb, agp_amd_flush_tlb),
DEVMETHOD(agp_enable, agp_generic_enable),
DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory),
DEVMETHOD(agp_free_memory, agp_generic_free_memory),
DEVMETHOD(agp_bind_memory, agp_generic_bind_memory),
DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory),
{ 0, 0 }
};
static driver_t agp_amd_driver = {
"agp",
agp_amd_methods,
sizeof(struct agp_amd_softc),
};
static devclass_t agp_devclass;
DRIVER_MODULE(agp_amd, pci, agp_amd_driver, agp_devclass, 0, 0);