agp_via.c

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    1 /*-
    2  * Copyright (c) 2000 Doug Rabson
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/5.2/sys/pci/agp_via.c 119288 2003-08-22 07:20:27Z imp $");
   29 
   30 #include "opt_bus.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/malloc.h>
   35 #include <sys/kernel.h>
   36 #include <sys/bus.h>
   37 #include <sys/lock.h>
   38 #include <sys/lockmgr.h>
   39 #include <sys/mutex.h>
   40 #include <sys/proc.h>
   41 
   42 #include <dev/pci/pcivar.h>
   43 #include <dev/pci/pcireg.h>
   44 #include <pci/agppriv.h>
   45 #include <pci/agpreg.h>
   46 
   47 #include <vm/vm.h>
   48 #include <vm/vm_object.h>
   49 #include <vm/pmap.h>
   50 
   51 struct agp_via_softc {
   52         struct agp_softc agp;
   53         u_int32_t       initial_aperture; /* aperture size at startup */
   54         struct agp_gatt *gatt;
   55 };
   56 
   57 static const char*
   58 agp_via_match(device_t dev)
   59 {
   60         if (pci_get_class(dev) != PCIC_BRIDGE
   61             || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
   62                 return NULL;
   63 
   64         if (agp_find_caps(dev) == 0)
   65                 return NULL;
   66 
   67         switch (pci_get_devid(dev)) {
   68         case 0x03051106:
   69                 return ("VIA 82C8363 (Apollo KT133A) host to PCI bridge");
   70         case 0x05011106:
   71                 return ("VIA 8501 (Apollo MVP4) host to PCI bridge");
   72         case 0x05971106:
   73                 return ("VIA 82C597 (Apollo VP3) host to PCI bridge");
   74         case 0x05981106:
   75                 return ("VIA 82C598 (Apollo MVP3) host to PCI bridge");
   76         case 0x06051106:
   77                 return ("VIA 82C694X (Apollo Pro 133A) host to PCI bridge");
   78         case 0x06911106:
   79                 return ("VIA 82C691 (Apollo Pro) host to PCI bridge");
   80         };
   81 
   82         if (pci_get_vendor(dev) == 0x1106)
   83                 return ("VIA Generic host to PCI bridge");
   84 
   85         return NULL;
   86 }
   87 
   88 static int
   89 agp_via_probe(device_t dev)
   90 {
   91         const char *desc;
   92 
   93         desc = agp_via_match(dev);
   94         if (desc) {
   95                 device_verbose(dev);
   96                 device_set_desc(dev, desc);
   97                 return 0;
   98         }
   99 
  100         return ENXIO;
  101 }
  102 
  103 static int
  104 agp_via_attach(device_t dev)
  105 {
  106         struct agp_via_softc *sc = device_get_softc(dev);
  107         struct agp_gatt *gatt;
  108         int error;
  109 
  110         error = agp_generic_attach(dev);
  111         if (error)
  112                 return error;
  113 
  114         sc->initial_aperture = AGP_GET_APERTURE(dev);
  115 
  116         for (;;) {
  117                 gatt = agp_alloc_gatt(dev);
  118                 if (gatt)
  119                         break;
  120 
  121                 /*
  122                  * Probably contigmalloc failure. Try reducing the
  123                  * aperture so that the gatt size reduces.
  124                  */
  125                 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
  126                         agp_generic_detach(dev);
  127                         return ENOMEM;
  128                 }
  129         }
  130         sc->gatt = gatt;
  131 
  132         /* Install the gatt. */
  133         pci_write_config(dev, AGP_VIA_ATTBASE, gatt->ag_physical | 3, 4);
  134         
  135         /* Enable the aperture. */
  136         pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
  137 
  138         return 0;
  139 }
  140 
  141 static int
  142 agp_via_detach(device_t dev)
  143 {
  144         struct agp_via_softc *sc = device_get_softc(dev);
  145         int error;
  146 
  147         error = agp_generic_detach(dev);
  148         if (error)
  149                 return error;
  150 
  151         pci_write_config(dev, AGP_VIA_GARTCTRL, 0, 4);
  152         pci_write_config(dev, AGP_VIA_ATTBASE, 0, 4);
  153         AGP_SET_APERTURE(dev, sc->initial_aperture);
  154         agp_free_gatt(sc->gatt);
  155 
  156         return 0;
  157 }
  158 
  159 static u_int32_t
  160 agp_via_get_aperture(device_t dev)
  161 {
  162         u_int32_t apsize;
  163 
  164         apsize = pci_read_config(dev, AGP_VIA_APSIZE, 1) & 0x1f;
  165 
  166         /*
  167          * The size is determined by the number of low bits of
  168          * register APBASE which are forced to zero. The low 20 bits
  169          * are always forced to zero and each zero bit in the apsize
  170          * field just read forces the corresponding bit in the 27:20
  171          * to be zero. We calculate the aperture size accordingly.
  172          */
  173         return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1;
  174 }
  175 
  176 static int
  177 agp_via_set_aperture(device_t dev, u_int32_t aperture)
  178 {
  179         u_int32_t apsize;
  180 
  181         /*
  182          * Reverse the magic from get_aperture.
  183          */
  184         apsize = ((aperture - 1) >> 20) ^ 0xff;
  185 
  186         /*
  187          * Double check for sanity.
  188          */
  189         if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture)
  190                 return EINVAL;
  191 
  192         pci_write_config(dev, AGP_VIA_APSIZE, apsize, 1);
  193 
  194         return 0;
  195 }
  196 
  197 static int
  198 agp_via_bind_page(device_t dev, int offset, vm_offset_t physical)
  199 {
  200         struct agp_via_softc *sc = device_get_softc(dev);
  201 
  202         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  203                 return EINVAL;
  204 
  205         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
  206         return 0;
  207 }
  208 
  209 static int
  210 agp_via_unbind_page(device_t dev, int offset)
  211 {
  212         struct agp_via_softc *sc = device_get_softc(dev);
  213 
  214         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  215                 return EINVAL;
  216 
  217         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
  218         return 0;
  219 }
  220 
  221 static void
  222 agp_via_flush_tlb(device_t dev)
  223 {
  224         pci_write_config(dev, AGP_VIA_GARTCTRL, 0x8f, 4);
  225         pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
  226 }
  227 
  228 static device_method_t agp_via_methods[] = {
  229         /* Device interface */
  230         DEVMETHOD(device_probe,         agp_via_probe),
  231         DEVMETHOD(device_attach,        agp_via_attach),
  232         DEVMETHOD(device_detach,        agp_via_detach),
  233         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  234         DEVMETHOD(device_suspend,       bus_generic_suspend),
  235         DEVMETHOD(device_resume,        bus_generic_resume),
  236 
  237         /* AGP interface */
  238         DEVMETHOD(agp_get_aperture,     agp_via_get_aperture),
  239         DEVMETHOD(agp_set_aperture,     agp_via_set_aperture),
  240         DEVMETHOD(agp_bind_page,        agp_via_bind_page),
  241         DEVMETHOD(agp_unbind_page,      agp_via_unbind_page),
  242         DEVMETHOD(agp_flush_tlb,        agp_via_flush_tlb),
  243         DEVMETHOD(agp_enable,           agp_generic_enable),
  244         DEVMETHOD(agp_alloc_memory,     agp_generic_alloc_memory),
  245         DEVMETHOD(agp_free_memory,      agp_generic_free_memory),
  246         DEVMETHOD(agp_bind_memory,      agp_generic_bind_memory),
  247         DEVMETHOD(agp_unbind_memory,    agp_generic_unbind_memory),
  248 
  249         { 0, 0 }
  250 };
  251 
  252 static driver_t agp_via_driver = {
  253         "agp",
  254         agp_via_methods,
  255         sizeof(struct agp_via_softc),
  256 };
  257 
  258 static devclass_t agp_devclass;
  259 
  260 DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0);
  261 MODULE_DEPEND(agp_via, agp, 1, 1, 1);
  262 MODULE_DEPEND(agp_via, pci, 1, 1, 1);

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FreeBSD/Linux Kernel Cross Reference sys/pci/agp_via.c

FreeBSD/Linux Kernel Cross Reference
sys/pci/agp_via.c