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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/5.3/sys/pci/agp_via.c 134195 2004-08-23 05:23:16Z imp $");
   29 
   30 #include "opt_bus.h"
   31 #ifndef PC98
   32 #include "opt_agp.h"
   33 #endif
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/malloc.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 #include <sys/bus.h>
   41 #include <sys/lock.h>
   42 #include <sys/mutex.h>
   43 #include <sys/proc.h>
   44 
   45 #include <dev/pci/pcivar.h>
   46 #include <dev/pci/pcireg.h>
   47 #include <pci/agppriv.h>
   48 #include <pci/agpreg.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/vm_object.h>
   52 #include <vm/pmap.h>
   53 
   54 #define REG_GARTCTRL    0
   55 #define REG_APSIZE      1
   56 #define REG_ATTBASE     2
   57 
   58 struct agp_via_softc {
   59         struct agp_softc agp;
   60         u_int32_t       initial_aperture; /* aperture size at startup */
   61         struct agp_gatt *gatt;
   62         int             *regs;
   63 };
   64 
   65 static int via_v2_regs[] = { AGP_VIA_GARTCTRL, AGP_VIA_APSIZE,
   66     AGP_VIA_ATTBASE };
   67 static int via_v3_regs[] = { AGP3_VIA_GARTCTRL, AGP3_VIA_APSIZE,
   68     AGP3_VIA_ATTBASE };
   69 
   70 static const char*
   71 agp_via_match(device_t dev)
   72 {
   73         if (pci_get_class(dev) != PCIC_BRIDGE
   74             || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
   75                 return NULL;
   76 
   77         if (agp_find_caps(dev) == 0)
   78                 return NULL;
   79 
   80         switch (pci_get_devid(dev)) {
   81         case 0x03051106:
   82                 return ("VIA 82C8363 (Apollo KT133A) host to PCI bridge");
   83         case 0x05011106:
   84                 return ("VIA 8501 (Apollo MVP4) host to PCI bridge");
   85         case 0x05971106:
   86                 return ("VIA 82C597 (Apollo VP3) host to PCI bridge");
   87         case 0x05981106:
   88                 return ("VIA 82C598 (Apollo MVP3) host to PCI bridge");
   89         case 0x06051106:
   90                 return ("VIA 82C694X (Apollo Pro 133A) host to PCI bridge");
   91         case 0x06911106:
   92                 return ("VIA 82C691 (Apollo Pro) host to PCI bridge");
   93         case 0x31881106:
   94 #if defined(__amd64__) || defined(AGP_AMD64_GART)
   95                 return NULL;
   96 #else
   97                 return ("VIA 8385 host to PCI bridge");
   98 #endif
   99         case 0x31891106:
  100                 return ("VIA 8377 (Apollo KT400/KT400A/KT600) host to PCI bridge");
  101         };
  102 
  103         if (pci_get_vendor(dev) == 0x1106)
  104                 return ("VIA Generic host to PCI bridge");
  105 
  106         return NULL;
  107 }
  108 
  109 static int
  110 agp_via_probe(device_t dev)
  111 {
  112         const char *desc;
  113 
  114         if (resource_disabled("agp", device_get_unit(dev)))
  115                 return (ENXIO);
  116         desc = agp_via_match(dev);
  117         if (desc) {
  118                 device_verbose(dev);
  119                 device_set_desc(dev, desc);
  120                 return 0;
  121         }
  122 
  123         return ENXIO;
  124 }
  125 
  126 static int
  127 agp_via_attach(device_t dev)
  128 {
  129         struct agp_via_softc *sc = device_get_softc(dev);
  130         struct agp_gatt *gatt;
  131         int error;
  132         u_int32_t agpsel;
  133 
  134         switch (pci_get_devid(dev)) {
  135 #ifdef AGP_NO_AMD64_GART
  136         case 0x31881106:
  137 #endif
  138         case 0x31891106:
  139                 /* The newer VIA chipsets will select the AGP version based on
  140                  * what AGP versions the card supports.  We still have to
  141                  * program it using the v2 registers if it has chosen to use
  142                  * compatibility mode.
  143                  */
  144                 agpsel = pci_read_config(dev, AGP_VIA_AGPSEL, 1);
  145                 if ((agpsel & (1 << 1)) == 0)
  146                         sc->regs = via_v3_regs;
  147                 else
  148                         sc->regs = via_v2_regs;
  149                 break;
  150         default:
  151                 sc->regs = via_v2_regs;
  152                 break;
  153         }
  154         
  155         error = agp_generic_attach(dev);
  156         if (error)
  157                 return error;
  158 
  159         sc->initial_aperture = AGP_GET_APERTURE(dev);
  160 
  161         for (;;) {
  162                 gatt = agp_alloc_gatt(dev);
  163                 if (gatt)
  164                         break;
  165 
  166                 /*
  167                  * Probably contigmalloc failure. Try reducing the
  168                  * aperture so that the gatt size reduces.
  169                  */
  170                 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
  171                         agp_generic_detach(dev);
  172                         return ENOMEM;
  173                 }
  174         }
  175         sc->gatt = gatt;
  176 
  177         /* Install the gatt. */
  178         pci_write_config(dev, sc->regs[REG_ATTBASE], gatt->ag_physical | 3, 4);
  179         
  180         /* Enable the aperture. */
  181         pci_write_config(dev, sc->regs[REG_GARTCTRL], 0x0f, 4);
  182 
  183         return 0;
  184 }
  185 
  186 static int
  187 agp_via_detach(device_t dev)
  188 {
  189         struct agp_via_softc *sc = device_get_softc(dev);
  190         int error;
  191 
  192         error = agp_generic_detach(dev);
  193         if (error)
  194                 return error;
  195 
  196         pci_write_config(dev, sc->regs[REG_GARTCTRL], 0, 4);
  197         pci_write_config(dev, sc->regs[REG_ATTBASE], 0, 4);
  198         AGP_SET_APERTURE(dev, sc->initial_aperture);
  199         agp_free_gatt(sc->gatt);
  200 
  201         return 0;
  202 }
  203 
  204 static u_int32_t
  205 agp_via_get_aperture(device_t dev)
  206 {
  207         struct agp_via_softc *sc = device_get_softc(dev);
  208         u_int32_t apsize;
  209 
  210         apsize = pci_read_config(dev, sc->regs[REG_APSIZE], 1) & 0x1f;
  211 
  212         /*
  213          * The size is determined by the number of low bits of
  214          * register APBASE which are forced to zero. The low 20 bits
  215          * are always forced to zero and each zero bit in the apsize
  216          * field just read forces the corresponding bit in the 27:20
  217          * to be zero. We calculate the aperture size accordingly.
  218          */
  219         return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1;
  220 }
  221 
  222 static int
  223 agp_via_set_aperture(device_t dev, u_int32_t aperture)
  224 {
  225         struct agp_via_softc *sc = device_get_softc(dev);
  226         u_int32_t apsize;
  227 
  228         /*
  229          * Reverse the magic from get_aperture.
  230          */
  231         apsize = ((aperture - 1) >> 20) ^ 0xff;
  232 
  233         /*
  234          * Double check for sanity.
  235          */
  236         if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture)
  237                 return EINVAL;
  238 
  239         pci_write_config(dev, sc->regs[REG_APSIZE], apsize, 1);
  240 
  241         return 0;
  242 }
  243 
  244 static int
  245 agp_via_bind_page(device_t dev, int offset, vm_offset_t physical)
  246 {
  247         struct agp_via_softc *sc = device_get_softc(dev);
  248 
  249         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  250                 return EINVAL;
  251 
  252         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
  253         return 0;
  254 }
  255 
  256 static int
  257 agp_via_unbind_page(device_t dev, int offset)
  258 {
  259         struct agp_via_softc *sc = device_get_softc(dev);
  260 
  261         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  262                 return EINVAL;
  263 
  264         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
  265         return 0;
  266 }
  267 
  268 static void
  269 agp_via_flush_tlb(device_t dev)
  270 {
  271         struct agp_via_softc *sc = device_get_softc(dev);
  272 
  273         pci_write_config(dev, sc->regs[REG_GARTCTRL], 0x8f, 4);
  274         pci_write_config(dev, sc->regs[REG_GARTCTRL], 0x0f, 4);
  275 }
  276 
  277 static device_method_t agp_via_methods[] = {
  278         /* Device interface */
  279         DEVMETHOD(device_probe,         agp_via_probe),
  280         DEVMETHOD(device_attach,        agp_via_attach),
  281         DEVMETHOD(device_detach,        agp_via_detach),
  282         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  283         DEVMETHOD(device_suspend,       bus_generic_suspend),
  284         DEVMETHOD(device_resume,        bus_generic_resume),
  285 
  286         /* AGP interface */
  287         DEVMETHOD(agp_get_aperture,     agp_via_get_aperture),
  288         DEVMETHOD(agp_set_aperture,     agp_via_set_aperture),
  289         DEVMETHOD(agp_bind_page,        agp_via_bind_page),
  290         DEVMETHOD(agp_unbind_page,      agp_via_unbind_page),
  291         DEVMETHOD(agp_flush_tlb,        agp_via_flush_tlb),
  292         DEVMETHOD(agp_enable,           agp_generic_enable),
  293         DEVMETHOD(agp_alloc_memory,     agp_generic_alloc_memory),
  294         DEVMETHOD(agp_free_memory,      agp_generic_free_memory),
  295         DEVMETHOD(agp_bind_memory,      agp_generic_bind_memory),
  296         DEVMETHOD(agp_unbind_memory,    agp_generic_unbind_memory),
  297 
  298         { 0, 0 }
  299 };
  300 
  301 static driver_t agp_via_driver = {
  302         "agp",
  303         agp_via_methods,
  304         sizeof(struct agp_via_softc),
  305 };
  306 
  307 static devclass_t agp_devclass;
  308 
  309 DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0);
  310 MODULE_DEPEND(agp_via, agp, 1, 1, 1);
  311 MODULE_DEPEND(agp_via, pci, 1, 1, 1);

Cache object: 3ce4105cb28b576b3d56c43cb5a9b603


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