From ab33dfac0143d5afabdb2d640b8d7d47c43609f4 Mon Sep 17 00:00:00 2001 From: dfr Date: Fri, 9 Jun 2000 16:04:30 +0000 Subject: A driver for programming the AGP hardware. This is only very lightly tested on Intel BX chipsets only. The other agp minidrivers are totally untested. The programming api is a subset of the Linux api and is only intended to be enough for the X server to use. There is also an in-kernel api for the use of other kernel modules such as the 3D DRI. --- sys/pci/agp_via.c | 253 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 253 insertions(+) create mode 100644 sys/pci/agp_via.c (limited to 'sys/pci/agp_via.c') diff --git a/sys/pci/agp_via.c b/sys/pci/agp_via.c new file mode 100644 index 0000000..983348e --- /dev/null +++ b/sys/pci/agp_via.c @@ -0,0 +1,253 @@ +/*- + * 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 +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include +#include +#include + +struct agp_via_softc { + struct agp_softc agp; + u_int32_t initial_aperture; /* aperture size at startup */ + struct agp_gatt *gatt; +}; + +static const char* +agp_via_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 0x05011106: + return ("VIA 8501 (Apollo MVP4) host to PCI bridge"); + case 0x05971106: + return ("VIA 82C597 (Apollo VP3) host to PCI bridge"); + case 0x05981106: + return ("VIA 82C598 (Apollo MVP3) host to PCI bridge"); + case 0x06911106: + return ("VIA 82C691 (Apollo Pro) host to PCI bridge"); + }; + + if (pci_get_vendor(dev) == 0x1106) + return ("VIA Generic host to PCI bridge"); + + return NULL; +} + +static int +agp_via_probe(device_t dev) +{ + const char *desc; + + desc = agp_via_match(dev); + if (desc) { + device_verbose(dev); + device_set_desc(dev, desc); + return 0; + } + + return ENXIO; +} + +static int +agp_via_attach(device_t dev) +{ + struct agp_via_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_VIA_ATTBASE, gatt->ag_physical | 3, 4); + + /* Enable the aperture. */ + pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4); + + return 0; +} + +static int +agp_via_detach(device_t dev) +{ + struct agp_via_softc *sc = device_get_softc(dev); + int error; + + error = agp_generic_detach(dev); + if (error) + return error; + + pci_write_config(dev, AGP_VIA_GARTCTRL, 0, 4); + pci_write_config(dev, AGP_VIA_ATTBASE, 0, 4); + AGP_SET_APERTURE(dev, sc->initial_aperture); + agp_free_gatt(sc->gatt); + + return 0; +} + +static u_int32_t +agp_via_get_aperture(device_t dev) +{ + u_int32_t apsize; + + apsize = pci_read_config(dev, AGP_VIA_APSIZE, 1) & 0x1f; + + /* + * The size is determined by the number of low bits of + * register APBASE which are forced to zero. The low 20 bits + * are always forced to zero and each zero bit in the apsize + * field just read forces the corresponding bit in the 27:20 + * to be zero. We calculate the aperture size accordingly. + */ + return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1; +} + +static int +agp_via_set_aperture(device_t dev, u_int32_t aperture) +{ + u_int32_t apsize; + + /* + * Reverse the magic from get_aperture. + */ + apsize = ((aperture - 1) >> 20) ^ 0xff; + + /* + * Double check for sanity. + */ + if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture) + return EINVAL; + + pci_write_config(dev, AGP_VIA_APSIZE, apsize, 1); + + return 0; +} + +static int +agp_via_bind_page(device_t dev, int offset, vm_offset_t physical) +{ + struct agp_via_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; + return 0; +} + +static int +agp_via_unbind_page(device_t dev, int offset) +{ + struct agp_via_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_via_flush_tlb(device_t dev) +{ + pci_write_config(dev, AGP_VIA_GARTCTRL, 0x8f, 4); + pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4); +} + +static device_method_t agp_via_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, agp_via_probe), + DEVMETHOD(device_attach, agp_via_attach), + DEVMETHOD(device_detach, agp_via_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_via_get_aperture), + DEVMETHOD(agp_set_aperture, agp_via_set_aperture), + DEVMETHOD(agp_bind_page, agp_via_bind_page), + DEVMETHOD(agp_unbind_page, agp_via_unbind_page), + DEVMETHOD(agp_flush_tlb, agp_via_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_via_driver = { + "agp", + agp_via_methods, + sizeof(struct agp_via_softc), +}; + +static devclass_t agp_devclass; + +DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0); -- cgit v1.1