The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/pci/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  *      $FreeBSD: releng/5.1/sys/pci/agp_via.c 113506 2003-04-15 06:37:30Z mdodd $
   27  */
   28 
   29 #include "opt_bus.h"
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/malloc.h>
   34 #include <sys/kernel.h>
   35 #include <sys/bus.h>
   36 #include <sys/lock.h>
   37 #include <sys/lockmgr.h>
   38 #include <sys/mutex.h>
   39 #include <sys/proc.h>
   40 
   41 #include <pci/pcivar.h>
   42 #include <pci/pcireg.h>
   43 #include <pci/agppriv.h>
   44 #include <pci/agpreg.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/vm_object.h>
   48 #include <vm/pmap.h>
   49 
   50 struct agp_via_softc {
   51         struct agp_softc agp;
   52         u_int32_t       initial_aperture; /* aperture size at startup */
   53         struct agp_gatt *gatt;
   54 };
   55 
   56 static const char*
   57 agp_via_match(device_t dev)
   58 {
   59         if (pci_get_class(dev) != PCIC_BRIDGE
   60             || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
   61                 return NULL;
   62 
   63         if (agp_find_caps(dev) == 0)
   64                 return NULL;
   65 
   66         switch (pci_get_devid(dev)) {
   67         case 0x05011106:
   68                 return ("VIA 8501 (Apollo MVP4) host to PCI bridge");
   69         case 0x05971106:
   70                 return ("VIA 82C597 (Apollo VP3) host to PCI bridge");
   71         case 0x05981106:
   72                 return ("VIA 82C598 (Apollo MVP3) host to PCI bridge");
   73         case 0x06911106:
   74                 return ("VIA 82C691 (Apollo Pro) host to PCI bridge");
   75         case 0x03051106:
   76             return ("VIA 82C8363 (Apollo KT133A) host to PCI bridge");
   77         };
   78 
   79         if (pci_get_vendor(dev) == 0x1106)
   80                 return ("VIA Generic host to PCI bridge");
   81 
   82         return NULL;
   83 }
   84 
   85 static int
   86 agp_via_probe(device_t dev)
   87 {
   88         const char *desc;
   89 
   90         desc = agp_via_match(dev);
   91         if (desc) {
   92                 device_verbose(dev);
   93                 device_set_desc(dev, desc);
   94                 return 0;
   95         }
   96 
   97         return ENXIO;
   98 }
   99 
  100 static int
  101 agp_via_attach(device_t dev)
  102 {
  103         struct agp_via_softc *sc = device_get_softc(dev);
  104         struct agp_gatt *gatt;
  105         int error;
  106 
  107         error = agp_generic_attach(dev);
  108         if (error)
  109                 return error;
  110 
  111         sc->initial_aperture = AGP_GET_APERTURE(dev);
  112 
  113         for (;;) {
  114                 gatt = agp_alloc_gatt(dev);
  115                 if (gatt)
  116                         break;
  117 
  118                 /*
  119                  * Probably contigmalloc failure. Try reducing the
  120                  * aperture so that the gatt size reduces.
  121                  */
  122                 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
  123                         agp_generic_detach(dev);
  124                         return ENOMEM;
  125                 }
  126         }
  127         sc->gatt = gatt;
  128 
  129         /* Install the gatt. */
  130         pci_write_config(dev, AGP_VIA_ATTBASE, gatt->ag_physical | 3, 4);
  131         
  132         /* Enable the aperture. */
  133         pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
  134 
  135         return 0;
  136 }
  137 
  138 static int
  139 agp_via_detach(device_t dev)
  140 {
  141         struct agp_via_softc *sc = device_get_softc(dev);
  142         int error;
  143 
  144         error = agp_generic_detach(dev);
  145         if (error)
  146                 return error;
  147 
  148         pci_write_config(dev, AGP_VIA_GARTCTRL, 0, 4);
  149         pci_write_config(dev, AGP_VIA_ATTBASE, 0, 4);
  150         AGP_SET_APERTURE(dev, sc->initial_aperture);
  151         agp_free_gatt(sc->gatt);
  152 
  153         return 0;
  154 }
  155 
  156 static u_int32_t
  157 agp_via_get_aperture(device_t dev)
  158 {
  159         u_int32_t apsize;
  160 
  161         apsize = pci_read_config(dev, AGP_VIA_APSIZE, 1) & 0x1f;
  162 
  163         /*
  164          * The size is determined by the number of low bits of
  165          * register APBASE which are forced to zero. The low 20 bits
  166          * are always forced to zero and each zero bit in the apsize
  167          * field just read forces the corresponding bit in the 27:20
  168          * to be zero. We calculate the aperture size accordingly.
  169          */
  170         return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1;
  171 }
  172 
  173 static int
  174 agp_via_set_aperture(device_t dev, u_int32_t aperture)
  175 {
  176         u_int32_t apsize;
  177 
  178         /*
  179          * Reverse the magic from get_aperture.
  180          */
  181         apsize = ((aperture - 1) >> 20) ^ 0xff;
  182 
  183         /*
  184          * Double check for sanity.
  185          */
  186         if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture)
  187                 return EINVAL;
  188 
  189         pci_write_config(dev, AGP_VIA_APSIZE, apsize, 1);
  190 
  191         return 0;
  192 }
  193 
  194 static int
  195 agp_via_bind_page(device_t dev, int offset, vm_offset_t physical)
  196 {
  197         struct agp_via_softc *sc = device_get_softc(dev);
  198 
  199         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  200                 return EINVAL;
  201 
  202         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
  203         return 0;
  204 }
  205 
  206 static int
  207 agp_via_unbind_page(device_t dev, int offset)
  208 {
  209         struct agp_via_softc *sc = device_get_softc(dev);
  210 
  211         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  212                 return EINVAL;
  213 
  214         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
  215         return 0;
  216 }
  217 
  218 static void
  219 agp_via_flush_tlb(device_t dev)
  220 {
  221         pci_write_config(dev, AGP_VIA_GARTCTRL, 0x8f, 4);
  222         pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4);
  223 }
  224 
  225 static device_method_t agp_via_methods[] = {
  226         /* Device interface */
  227         DEVMETHOD(device_probe,         agp_via_probe),
  228         DEVMETHOD(device_attach,        agp_via_attach),
  229         DEVMETHOD(device_detach,        agp_via_detach),
  230         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  231         DEVMETHOD(device_suspend,       bus_generic_suspend),
  232         DEVMETHOD(device_resume,        bus_generic_resume),
  233 
  234         /* AGP interface */
  235         DEVMETHOD(agp_get_aperture,     agp_via_get_aperture),
  236         DEVMETHOD(agp_set_aperture,     agp_via_set_aperture),
  237         DEVMETHOD(agp_bind_page,        agp_via_bind_page),
  238         DEVMETHOD(agp_unbind_page,      agp_via_unbind_page),
  239         DEVMETHOD(agp_flush_tlb,        agp_via_flush_tlb),
  240         DEVMETHOD(agp_enable,           agp_generic_enable),
  241         DEVMETHOD(agp_alloc_memory,     agp_generic_alloc_memory),
  242         DEVMETHOD(agp_free_memory,      agp_generic_free_memory),
  243         DEVMETHOD(agp_bind_memory,      agp_generic_bind_memory),
  244         DEVMETHOD(agp_unbind_memory,    agp_generic_unbind_memory),
  245 
  246         { 0, 0 }
  247 };
  248 
  249 static driver_t agp_via_driver = {
  250         "agp",
  251         agp_via_methods,
  252         sizeof(struct agp_via_softc),
  253 };
  254 
  255 static devclass_t agp_devclass;
  256 
  257 DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0);
  258 MODULE_DEPEND(agp_via, agp, 1, 1, 1);
  259 MODULE_DEPEND(agp_via, pci, 1, 1, 1);

Cache object: a4771c493b6752df8cdc1c66272406a6


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