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_ali.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  *      $FreeBSD$
   27  */
   28 
   29 #include "opt_bus.h"
   30 #include "opt_pci.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 
   39 #include <pci/pcivar.h>
   40 #include <pci/pcireg.h>
   41 #include <pci/agppriv.h>
   42 #include <pci/agpreg.h>
   43 
   44 #include <vm/vm.h>
   45 #include <vm/vm_object.h>
   46 #include <vm/pmap.h>
   47 
   48 struct agp_ali_softc {
   49         struct agp_softc agp;
   50         u_int32_t       initial_aperture; /* aperture size at startup */
   51         struct agp_gatt *gatt;
   52 };
   53 
   54 static const char*
   55 agp_ali_match(device_t dev)
   56 {
   57         if (pci_get_class(dev) != PCIC_BRIDGE
   58             || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
   59                 return NULL;
   60 
   61         if (agp_find_caps(dev) == 0)
   62                 return NULL;
   63 
   64         switch (pci_get_devid(dev)) {
   65         case 0x154110b9:
   66                 return ("Ali M1541 host to AGP bridge");
   67         };
   68 
   69         if (pci_get_vendor(dev) == 0x10b9)
   70                 return ("Ali Generic host to PCI bridge");
   71 
   72         return NULL;
   73 }
   74 
   75 static int
   76 agp_ali_probe(device_t dev)
   77 {
   78         const char *desc;
   79 
   80         desc = agp_ali_match(dev);
   81         if (desc) {
   82                 device_verbose(dev);
   83                 device_set_desc(dev, desc);
   84                 return 0;
   85         }
   86 
   87         return ENXIO;
   88 }
   89 
   90 static int
   91 agp_ali_attach(device_t dev)
   92 {
   93         struct agp_ali_softc *sc = device_get_softc(dev);
   94         struct agp_gatt *gatt;
   95         int error;
   96 
   97         error = agp_generic_attach(dev);
   98         if (error)
   99                 return error;
  100 
  101         sc->initial_aperture = AGP_GET_APERTURE(dev);
  102 
  103         for (;;) {
  104                 gatt = agp_alloc_gatt(dev);
  105                 if (gatt)
  106                         break;
  107 
  108                 /*
  109                  * Probably contigmalloc failure. Try reducing the
  110                  * aperture so that the gatt size reduces.
  111                  */
  112                 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
  113                         agp_generic_detach(dev);
  114                         return ENOMEM;
  115                 }
  116         }
  117         sc->gatt = gatt;
  118 
  119         /* Install the gatt. */
  120         pci_write_config(dev, AGP_ALI_ATTBASE,
  121                          (gatt->ag_physical
  122                           | (pci_read_config(dev, AGP_ALI_ATTBASE, 4) & 0xff)),
  123                          4);
  124         
  125         /* Enable the TLB. */
  126         pci_write_config(dev, AGP_ALI_TLBCTRL, 0x10, 1);
  127 
  128         return 0;
  129 }
  130 
  131 static int
  132 agp_ali_detach(device_t dev)
  133 {
  134         struct agp_ali_softc *sc = device_get_softc(dev);
  135         int error;
  136 
  137         error = agp_generic_detach(dev);
  138         if (error)
  139                 return error;
  140 
  141         /* Disable the TLB.. */
  142         pci_write_config(dev, AGP_ALI_TLBCTRL, 0x90, 1);
  143 
  144         /* Put the aperture back the way it started. */
  145         AGP_SET_APERTURE(dev, sc->initial_aperture);
  146         pci_write_config(dev, AGP_ALI_ATTBASE,
  147                          pci_read_config(dev, AGP_ALI_ATTBASE, 4) & 0xff,
  148                          4);
  149 
  150         agp_free_gatt(sc->gatt);
  151         return 0;
  152 }
  153 
  154 #define M 1024*1024
  155 
  156 static u_int32_t agp_ali_table[] = {
  157         0,                      /* 0 - invalid */
  158         1,                      /* 1 - invalid */
  159         2,                      /* 2 - invalid */
  160         4*M,                    /* 3 - invalid */
  161         8*M,                    /* 4 - invalid */
  162         0,                      /* 5 - invalid */
  163         16*M,                   /* 6 - invalid */
  164         32*M,                   /* 7 - invalid */
  165         64*M,                   /* 8 - invalid */
  166         128*M,                  /* 9 - invalid */
  167         256*M,                  /* 10 - invalid */
  168 };
  169 #define agp_ali_table_size (sizeof(agp_ali_table) / sizeof(agp_ali_table[0]))
  170 
  171 static u_int32_t
  172 agp_ali_get_aperture(device_t dev)
  173 {
  174         /*
  175          * The aperture size is derived from the low bits of attbase.
  176          * I'm not sure this is correct..
  177          */
  178         int i = pci_read_config(dev, AGP_ALI_ATTBASE, 4) & 0xff;
  179         if (i >= agp_ali_table_size)
  180                 return 0;
  181         return agp_ali_table[i];
  182 }
  183 
  184 static int
  185 agp_ali_set_aperture(device_t dev, u_int32_t aperture)
  186 {
  187         int i;
  188 
  189         for (i = 0; i < agp_ali_table_size; i++)
  190                 if (agp_ali_table[i] == aperture)
  191                         break;
  192         if (i == agp_ali_table_size)
  193                 return EINVAL;
  194 
  195         pci_write_config(dev, AGP_ALI_ATTBASE,
  196                          ((pci_read_config(dev, AGP_ALI_ATTBASE, 4) & ~0xff)
  197                           | i), 4);
  198         return 0;
  199 }
  200 
  201 static int
  202 agp_ali_bind_page(device_t dev, int offset, vm_offset_t physical)
  203 {
  204         struct agp_ali_softc *sc = device_get_softc(dev);
  205 
  206         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  207                 return EINVAL;
  208 
  209         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
  210         return 0;
  211 }
  212 
  213 static int
  214 agp_ali_unbind_page(device_t dev, int offset)
  215 {
  216         struct agp_ali_softc *sc = device_get_softc(dev);
  217 
  218         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  219                 return EINVAL;
  220 
  221         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
  222         return 0;
  223 }
  224 
  225 static void
  226 agp_ali_flush_tlb(device_t dev)
  227 {
  228         pci_write_config(dev, AGP_ALI_TLBCTRL, 0x90, 1);
  229         pci_write_config(dev, AGP_ALI_TLBCTRL, 0x10, 1);
  230 }
  231 
  232 static device_method_t agp_ali_methods[] = {
  233         /* Device interface */
  234         DEVMETHOD(device_probe,         agp_ali_probe),
  235         DEVMETHOD(device_attach,        agp_ali_attach),
  236         DEVMETHOD(device_detach,        agp_ali_detach),
  237         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  238         DEVMETHOD(device_suspend,       bus_generic_suspend),
  239         DEVMETHOD(device_resume,        bus_generic_resume),
  240 
  241         /* AGP interface */
  242         DEVMETHOD(agp_get_aperture,     agp_ali_get_aperture),
  243         DEVMETHOD(agp_set_aperture,     agp_ali_set_aperture),
  244         DEVMETHOD(agp_bind_page,        agp_ali_bind_page),
  245         DEVMETHOD(agp_unbind_page,      agp_ali_unbind_page),
  246         DEVMETHOD(agp_flush_tlb,        agp_ali_flush_tlb),
  247         DEVMETHOD(agp_enable,           agp_generic_enable),
  248         DEVMETHOD(agp_alloc_memory,     agp_generic_alloc_memory),
  249         DEVMETHOD(agp_free_memory,      agp_generic_free_memory),
  250         DEVMETHOD(agp_bind_memory,      agp_generic_bind_memory),
  251         DEVMETHOD(agp_unbind_memory,    agp_generic_unbind_memory),
  252 
  253         { 0, 0 }
  254 };
  255 
  256 static driver_t agp_ali_driver = {
  257         "agp",
  258         agp_ali_methods,
  259         sizeof(struct agp_ali_softc),
  260 };
  261 
  262 static devclass_t agp_devclass;
  263 
  264 DRIVER_MODULE(agp_ali, pci, agp_ali_driver, agp_devclass, 0, 0);

Cache object: e47a494d8ab24472a09eb1509b0d1d49


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