mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-21 11:13:30 +00:00
Code Issues Releases Activity
a851c66778
freebsd/sys/dev/agp/agp_apple.c
Tijl Coosemans 4e612cddb9 In agp(4) avoid the need to flush all cpu caches with wbinvd between 
updating the GTT and flushing the AGP TLB by storing the GTT in
write-combining memory.

On x86 flushing the AGP TLB is done by an I/O operation or a store to a
MMIO register in uncacheable memory.  Both cases imply that WC buffers are
flushed so no memory barriers are needed.

On powerpc there is no WC memory type.  It maps to uncacheable memory and
two stores to uncacheable memory, such as to the GTT and then to an MMIO
register, are strongly ordered, so no memory barriers are needed either.

MFC after:	1 month
2014-11-02 11:26:37 +00:00

297 lines
7.5 KiB
C
Raw Blame History

/*-
* Copyright (c) 2010 Nathan Whitehorn
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <machine/resource.h>
#include <dev/agp/agppriv.h>
#include <dev/agp/agpreg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/pmap.h>
#define UNIN_AGP_GART_BASE 0x8c
#define UNIN_AGP_BASE_ADDR 0x90
#define UNIN_AGP_GART_CONTROL 0x94
#define UNIN_AGP_GART_INVAL 0x00000001
#define UNIN_AGP_GART_ENABLE 0x00000100
#define UNIN_AGP_GART_2XRESET 0x00010000
#define UNIN_AGP_U3_GART_PERFRD 0x00080000
struct agp_apple_softc {
struct agp_softc agp;
uint32_t aperture;
struct agp_gatt *gatt;
int u3;
int needs_2x_reset;
};
static int
agp_apple_probe(device_t dev)
{
if (resource_disabled("agp", device_get_unit(dev)))
return (ENXIO);
if (pci_get_class(dev) != PCIC_BRIDGE
|| pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
return (ENXIO);
if (agp_find_caps(dev) == 0)
return (ENXIO);
if (pci_get_class(dev) != PCIC_BRIDGE
|| pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
return (ENXIO);
switch (pci_get_devid(dev)) {
case 0x0020106b:
case 0x0027106b:
device_set_desc(dev, "Apple UniNorth AGP Bridge");
return (BUS_PROBE_DEFAULT);
case 0x002d106b:
device_set_desc(dev, "Apple UniNorth 1.5 AGP Bridge");
return (BUS_PROBE_DEFAULT);
case 0x0034106b:
device_set_desc(dev, "Apple UniNorth 2 AGP Bridge");
return (BUS_PROBE_DEFAULT);
case 0x004b106b:
case 0x0058106b:
case 0x0059106b:
device_set_desc(dev, "Apple U3 AGP Bridge");
return (BUS_PROBE_DEFAULT);
case 0x0066106b:
device_set_desc(dev, "Apple Intrepid AGP Bridge");
return (BUS_PROBE_DEFAULT);
}
return (ENXIO);
}
static int
agp_apple_attach(device_t dev)
{
struct agp_apple_softc *sc = device_get_softc(dev);
int error;
/* Record quirks */
sc->needs_2x_reset = 0;
sc->u3 = 0;
switch (pci_get_devid(dev)) {
case 0x0020106b:
case 0x0027106b:
sc->needs_2x_reset = 1;
break;
case 0x004b106b:
case 0x0058106b:
case 0x0059106b:
sc->u3 = 1;
break;
}
/* Set the aperture bus address base (must be 0) */
pci_write_config(dev, UNIN_AGP_BASE_ADDR, 0, 4);
agp_set_aperture_resource(dev, -1);
error = agp_generic_attach(dev);
if (error)
return (error);
sc->aperture = 256*1024*1024;
for (sc->aperture = 256*1024*1024; sc->aperture >= 4*1024*1024;
sc->aperture /= 2) {
sc->gatt = agp_alloc_gatt(dev);
if (sc->gatt)
break;
}
if (sc->aperture < 4*1024*1024) {
agp_generic_detach(dev);
return ENOMEM;
}
/* Install the gatt. */
AGP_SET_APERTURE(dev, sc->aperture);
/* XXX: U3 scratch page? */
/* Enable the aperture and TLB. */
AGP_FLUSH_TLB(dev);
return (0);
}
static int
agp_apple_detach(device_t dev)
{
struct agp_apple_softc *sc = device_get_softc(dev);
agp_free_cdev(dev);
/* Disable the aperture and TLB */
pci_write_config(dev, UNIN_AGP_GART_CONTROL, UNIN_AGP_GART_INVAL, 4);
pci_write_config(dev, UNIN_AGP_GART_CONTROL, 0, 4);
if (sc->needs_2x_reset) {
pci_write_config(dev, UNIN_AGP_GART_CONTROL,
UNIN_AGP_GART_2XRESET, 4);
pci_write_config(dev, UNIN_AGP_GART_CONTROL, 0, 4);
}
AGP_SET_APERTURE(dev, 0);
agp_free_gatt(sc->gatt);
agp_free_res(dev);
return 0;
}
static uint32_t
agp_apple_get_aperture(device_t dev)
{
struct agp_apple_softc *sc = device_get_softc(dev);
return (sc->aperture);
}
static int
agp_apple_set_aperture(device_t dev, uint32_t aperture)
{
struct agp_apple_softc *sc = device_get_softc(dev);
/*
* Check for a multiple of 4 MB and make sure it is within the
* programmable range.
*/
if (aperture % (4*1024*1024)
|| aperture < 4*1024*1024
|| aperture > ((sc->u3) ? 512 : 256)*1024*1024)
return EINVAL;
/* The aperture value is a multiple of 4 MB */
aperture /= (4*1024*1024);
pci_write_config(dev, UNIN_AGP_GART_BASE,
(sc->gatt->ag_physical & 0xfffff000) | aperture, 4);
return (0);
}
static int
agp_apple_bind_page(device_t dev, vm_offset_t offset, vm_offset_t physical)
{
struct agp_apple_softc *sc = device_get_softc(dev);
if (offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
return EINVAL;
sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
return (0);
}
static int
agp_apple_unbind_page(device_t dev, vm_offset_t offset)
{
struct agp_apple_softc *sc = device_get_softc(dev);
if (offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
return EINVAL;
sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
return (0);
}
static void
agp_apple_flush_tlb(device_t dev)
{
struct agp_apple_softc *sc = device_get_softc(dev);
uint32_t cntrl = UNIN_AGP_GART_ENABLE;
if (sc->u3)
cntrl |= UNIN_AGP_U3_GART_PERFRD;
pci_write_config(dev, UNIN_AGP_GART_CONTROL,
cntrl | UNIN_AGP_GART_INVAL, 4);
pci_write_config(dev, UNIN_AGP_GART_CONTROL, cntrl, 4);
if (sc->needs_2x_reset) {
pci_write_config(dev, UNIN_AGP_GART_CONTROL,
cntrl | UNIN_AGP_GART_2XRESET, 4);
pci_write_config(dev, UNIN_AGP_GART_CONTROL, cntrl, 4);
}
}
static device_method_t agp_apple_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, agp_apple_probe),
DEVMETHOD(device_attach, agp_apple_attach),
DEVMETHOD(device_detach, agp_apple_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_apple_get_aperture),
DEVMETHOD(agp_set_aperture, agp_apple_set_aperture),
DEVMETHOD(agp_bind_page, agp_apple_bind_page),
DEVMETHOD(agp_unbind_page, agp_apple_unbind_page),
DEVMETHOD(agp_flush_tlb, agp_apple_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_apple_driver = {
"agp",
agp_apple_methods,
sizeof(struct agp_apple_softc),
};
static devclass_t agp_devclass;
DRIVER_MODULE(agp_apple, hostb, agp_apple_driver, agp_devclass, 0, 0);
MODULE_DEPEND(agp_apple, agp, 1, 1, 1);
MODULE_DEPEND(agp_apple, pci, 1, 1, 1);
Reference in New Issue View Git Blame Copy Permalink