NetBSD/sys/dev/pci/agp_amd.c

342 lines
8.9 KiB
C

/* $NetBSD: agp_amd.c,v 1.10 2004/10/20 21:47:13 xtraeme 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_amd.c,v 1.6 2001/07/05 21:28:46 jhb Exp $
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: agp_amd.c,v 1.10 2004/10/20 21:47:13 xtraeme 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 <uvm/uvm_extern.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/agpvar.h>
#include <dev/pci/agpreg.h>
#include <dev/pci/pcidevs.h>
#define READ2(off) bus_space_read_2(asc->iot, asc->ioh, off)
#define READ4(off) bus_space_read_4(asc->iot, asc->ioh, off)
#define WRITE2(off,v) bus_space_write_2(asc->iot, asc->ioh, off, v)
#define WRITE4(off,v) bus_space_write_4(asc->iot, asc->ioh, off, v)
struct agp_amd_gatt {
bus_dmamap_t ag_dmamap;
bus_dma_segment_t ag_dmaseg;
int ag_nseg;
u_int32_t ag_entries;
u_int32_t *ag_vdir; /* virtual address of page dir */
bus_addr_t ag_pdir; /* bus address of page dir */
u_int32_t *ag_virtual; /* virtual address of gatt */
bus_addr_t ag_physical; /* bus address of gatt */
size_t ag_size;
};
struct agp_amd_softc {
u_int32_t initial_aperture; /* aperture size at startup */
struct agp_amd_gatt *gatt;
bus_space_handle_t ioh;
bus_space_tag_t iot;
};
static u_int32_t agp_amd_get_aperture(struct agp_softc *);
static int agp_amd_set_aperture(struct agp_softc *, u_int32_t);
static int agp_amd_bind_page(struct agp_softc *, off_t, bus_addr_t);
static int agp_amd_unbind_page(struct agp_softc *, off_t);
static void agp_amd_flush_tlb(struct agp_softc *);
struct agp_methods agp_amd_methods = {
agp_amd_get_aperture,
agp_amd_set_aperture,
agp_amd_bind_page,
agp_amd_unbind_page,
agp_amd_flush_tlb,
agp_generic_enable,
agp_generic_alloc_memory,
agp_generic_free_memory,
agp_generic_bind_memory,
agp_generic_unbind_memory,
};
static struct agp_amd_gatt *
agp_amd_alloc_gatt(struct agp_softc *sc)
{
u_int32_t apsize = AGP_GET_APERTURE(sc);
u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
struct agp_amd_gatt *gatt;
int i, npages;
caddr_t vdir;
gatt = malloc(sizeof(struct agp_amd_gatt), M_AGP, M_NOWAIT);
if (!gatt)
return 0;
if (agp_alloc_dmamem(sc->as_dmat,
AGP_PAGE_SIZE + entries * sizeof(u_int32_t), 0,
&gatt->ag_dmamap, &vdir, &gatt->ag_pdir,
&gatt->ag_dmaseg, 1, &gatt->ag_nseg) != 0) {
printf("failed to allocate GATT\n");
free(gatt, M_AGP);
return NULL;
}
gatt->ag_vdir = (u_int32_t *)vdir;
gatt->ag_entries = entries;
gatt->ag_virtual = (u_int32_t *)(vdir + AGP_PAGE_SIZE);
gatt->ag_physical = gatt->ag_pdir + AGP_PAGE_SIZE;
gatt->ag_size = AGP_PAGE_SIZE + entries * sizeof(u_int32_t);
memset(gatt->ag_vdir, 0, AGP_PAGE_SIZE);
memset(gatt->ag_virtual, 0, entries * sizeof(u_int32_t));
/*
* Map the pages of the GATT into the page directory.
*/
npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1)
>> AGP_PAGE_SHIFT);
for (i = 0; i < npages; i++)
gatt->ag_vdir[i] = (gatt->ag_physical + i * AGP_PAGE_SIZE) | 1;
/*
* Make sure the chipset can see everything.
*/
agp_flush_cache();
return gatt;
}
#if 0
static void
agp_amd_free_gatt(struct agp_softc *sc, struct agp_amd_gatt *gatt)
{
agp_free_dmamem(sc->as_dmat, gatt->ag_size,
gatt->ag_dmamap, (caddr_t)gatt->ag_virtual, &gatt->ag_dmaseg,
gatt->ag_nseg);
free(gatt, M_AGP);
}
#endif
int
agp_amd_match(const struct pci_attach_args *pa)
{
switch (PCI_PRODUCT(pa->pa_id)) {
case PCI_PRODUCT_AMD_SC751_SC:
case PCI_PRODUCT_AMD_SC761_SC:
case PCI_PRODUCT_AMD_SC762_NB:
return 1;
}
return 0;
}
int
agp_amd_attach(struct device *parent, struct device *self, void *aux)
{
struct agp_softc *sc = (void *)self;
struct agp_amd_softc *asc;
struct pci_attach_args *pa = aux;
struct agp_amd_gatt *gatt;
pcireg_t reg;
int error;
asc = malloc(sizeof *asc, M_AGP, M_NOWAIT|M_ZERO);
if (asc == NULL) {
aprint_error(": can't allocate softc\n");
/* agp_generic_detach(sc) */
return ENOMEM;
}
error = pci_mapreg_map(pa, AGP_AMD751_REGISTERS, PCI_MAPREG_TYPE_MEM, 0,
&asc->iot, &asc->ioh, NULL, NULL);
if (error != 0) {
aprint_error(": can't map AGP registers\n");
agp_generic_detach(sc);
return error;
}
if (agp_map_aperture(pa, sc) != 0) {
aprint_error(": can't map aperture\n");
agp_generic_detach(sc);
free(asc, M_AGP);
return ENXIO;
}
pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff,
NULL);
sc->as_methods = &agp_amd_methods;
sc->as_chipc = asc;
asc->initial_aperture = AGP_GET_APERTURE(sc);
for (;;) {
gatt = agp_amd_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)) {
aprint_error(": can't set aperture\n");
return ENOMEM;
}
}
asc->gatt = gatt;
/* Install the gatt. */
WRITE4(AGP_AMD751_ATTBASE, gatt->ag_physical);
/* Enable synchronisation between host and agp. */
reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_AMD751_MODECTRL);
reg &= ~0x00ff00ff;
reg |= (AGP_AMD751_MODECTRL_SYNEN) | (AGP_AMD751_MODECTRL2_GPDCE << 16);
pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_AMD751_MODECTRL, reg);
/* Enable the TLB and flush */
WRITE2(AGP_AMD751_STATUS,
READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE);
AGP_FLUSH_TLB(sc);
return 0;
}
#if 0
static int
agp_amd_detach(struct agp_softc *sc)
{
pcireg_t reg;
struct agp_amd_softc *asc = sc->as_chipc;
/* Disable the TLB.. */
WRITE2(AGP_AMD751_STATUS,
READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE);
/* Disable host-agp sync */
reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_MODECTRL);
reg &= 0xffffff00;
pci_conf_write(sc->as_pc, sc->as_tag, AGP_AMD751_MODECTRL, reg);
/* Clear the GATT base */
WRITE4(AGP_AMD751_ATTBASE, 0);
/* Put the aperture back the way it started. */
AGP_SET_APERTURE(sc, asc->initial_aperture);
agp_amd_free_gatt(sc, asc->gatt);
/* XXXfvdl no pci_mapreg_unmap */
return 0;
}
#endif
static u_int32_t
agp_amd_get_aperture(struct agp_softc *sc)
{
int vas;
vas = (pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL) & 0x06);
vas >>= 1;
/*
* The aperture size is equal to 32M<<vas.
*/
return (32*1024*1024) << vas;
}
static int
agp_amd_set_aperture(struct agp_softc *sc, u_int32_t aperture)
{
int vas;
pcireg_t reg;
/*
* 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;
reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL);
reg = (reg & ~0x06) | (vas << 1);
pci_conf_write(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL, reg);
return 0;
}
static int
agp_amd_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical)
{
struct agp_amd_softc *asc = sc->as_chipc;
if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
return EINVAL;
asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1;
return 0;
}
static int
agp_amd_unbind_page(struct agp_softc *sc, off_t offset)
{
struct agp_amd_softc *asc = sc->as_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_amd_flush_tlb(struct agp_softc *sc)
{
struct agp_amd_softc *asc = sc->as_chipc;
/* 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));
}