freebsd-dev/sys/pci/agp_intel.c
Alfred Perlstein 2395531439 Introduce a global lock for the vm subsystem (vm_mtx).
vm_mtx does not recurse and is required for most low level
vm operations.

faults can not be taken without holding Giant.

Memory subsystems can now call the base page allocators safely.

Almost all atomic ops were removed as they are covered under the
vm mutex.

Alpha and ia64 now need to catch up to i386's trap handlers.

FFS and NFS have been tested, other filesystems will need minor
changes (grabbing the vm lock when twiddling page properties).

Reviewed (partially) by: jake, jhb
2001-05-19 01:28:09 +00:00

271 lines
6.8 KiB
C

/*-
* 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 <sys/mutex.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>
struct agp_intel_softc {
struct agp_softc agp;
u_int32_t initial_aperture; /* aperture size at startup */
struct agp_gatt *gatt;
};
static const char*
agp_intel_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)) {
/* Intel -- vendor 0x8086 */
case 0x71808086:
return ("Intel 82443LX (440 LX) host to PCI bridge");
case 0x71908086:
return ("Intel 82443BX (440 BX) host to PCI bridge");
case 0x71a08086:
return ("Intel 82443GX host to PCI bridge");
case 0x71a18086:
return ("Intel 82443GX host to AGP bridge");
case 0x11308086:
return ("Intel 82815 (i815 GMCH) host to PCI bridge");
};
if (pci_get_vendor(dev) == 0x8086)
return ("Intel Generic host to PCI bridge");
return NULL;
}
static int
agp_intel_probe(device_t dev)
{
const char *desc;
desc = agp_intel_match(dev);
if (desc) {
device_verbose(dev);
device_set_desc(dev, desc);
return 0;
}
return ENXIO;
}
static int
agp_intel_attach(device_t dev)
{
struct agp_intel_softc *sc = device_get_softc(dev);
struct agp_gatt *gatt;
int error;
error = agp_generic_attach(dev);
if (error)
return error;
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)) {
agp_generic_detach(dev);
return ENOMEM;
}
}
sc->gatt = gatt;
/* Install the gatt. */
pci_write_config(dev, AGP_INTEL_ATTBASE, gatt->ag_physical, 4);
/* Enable things, clear errors etc. */
pci_write_config(dev, AGP_INTEL_AGPCTRL, 0x2280, 4);
pci_write_config(dev, AGP_INTEL_NBXCFG,
(pci_read_config(dev, AGP_INTEL_NBXCFG, 4)
& ~(1 << 10)) | (1 << 9), 4);
pci_write_config(dev, AGP_INTEL_ERRSTS + 1, 7, 1);
return 0;
}
static int
agp_intel_detach(device_t dev)
{
struct agp_intel_softc *sc = device_get_softc(dev);
int error;
error = agp_generic_detach(dev);
if (error)
return error;
printf("%s: set NBXCFG to %x\n", __FUNCTION__,
(pci_read_config(dev, AGP_INTEL_NBXCFG, 4)
& ~(1 << 9)));
pci_write_config(dev, AGP_INTEL_NBXCFG,
(pci_read_config(dev, AGP_INTEL_NBXCFG, 4)
& ~(1 << 9)), 4);
pci_write_config(dev, AGP_INTEL_ATTBASE, 0, 4);
AGP_SET_APERTURE(dev, sc->initial_aperture);
agp_free_gatt(sc->gatt);
return 0;
}
static u_int32_t
agp_intel_get_aperture(device_t dev)
{
u_int32_t apsize;
apsize = pci_read_config(dev, AGP_INTEL_APSIZE, 1) & 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(device_t dev, u_int32_t aperture)
{
u_int32_t apsize;
/*
* 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;
pci_write_config(dev, AGP_INTEL_APSIZE, apsize, 1);
return 0;
}
static int
agp_intel_bind_page(device_t dev, int offset, vm_offset_t physical)
{
struct agp_intel_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 | 0x17;
return 0;
}
static int
agp_intel_unbind_page(device_t dev, int offset)
{
struct agp_intel_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_intel_flush_tlb(device_t dev)
{
pci_write_config(dev, AGP_INTEL_AGPCTRL, 0x2200, 4);
pci_write_config(dev, AGP_INTEL_AGPCTRL, 0x2280, 4);
}
static device_method_t agp_intel_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, agp_intel_probe),
DEVMETHOD(device_attach, agp_intel_attach),
DEVMETHOD(device_detach, agp_intel_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_intel_get_aperture),
DEVMETHOD(agp_set_aperture, agp_intel_set_aperture),
DEVMETHOD(agp_bind_page, agp_intel_bind_page),
DEVMETHOD(agp_unbind_page, agp_intel_unbind_page),
DEVMETHOD(agp_flush_tlb, agp_intel_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_intel_driver = {
"agp",
agp_intel_methods,
sizeof(struct agp_intel_softc),
};
static devclass_t agp_devclass;
DRIVER_MODULE(agp_intel, pci, agp_intel_driver, agp_devclass, 0, 0);