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/dev/agp/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: src/sys/dev/agp/agp_ali.c,v 1.20 2007/11/12 21:51:36 jhb Exp $
   27  */
   28 
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/malloc.h>
   32 #include <sys/kernel.h>
   33 #include <sys/bus.h>
   34 #include <sys/lock.h>
   35 
   36 #include <bus/pci/pcivar.h>
   37 #include <bus/pci/pcireg.h>
   38 #include "agppriv.h"
   39 #include "agpreg.h"
   40 
   41 #include <vm/vm.h>
   42 #include <vm/vm_object.h>
   43 #include <vm/pmap.h>
   44 
   45 struct agp_ali_softc {
   46         struct agp_softc agp;
   47         u_int32_t       initial_aperture; /* aperture size at startup */
   48         struct agp_gatt *gatt;
   49 };
   50 
   51 static const char*
   52 agp_ali_match(device_t dev)
   53 {
   54         if (pci_get_class(dev) != PCIC_BRIDGE
   55             || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
   56                 return NULL;
   57 
   58         if (agp_find_caps(dev) == 0)
   59                 return NULL;
   60 
   61         switch (pci_get_devid(dev)) {
   62         case 0x167110b9:
   63                 return ("Ali M1671 host to AGP bridge");
   64         case 0x154110b9:
   65                 return ("Ali M1541 host to AGP bridge");
   66         case 0x162110b9:
   67                 return ("Ali M1621 host to AGP bridge");
   68         };
   69 
   70         return NULL;
   71 }
   72 
   73 static int
   74 agp_ali_probe(device_t dev)
   75 {
   76         const char *desc;
   77 
   78         if (resource_disabled("agp", device_get_unit(dev)))
   79                 return (ENXIO);
   80         desc = agp_ali_match(dev);
   81         if (desc) {
   82                 device_verbose(dev);
   83                 device_set_desc(dev, desc);
   84                 return BUS_PROBE_DEFAULT;
   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         u_int32_t attbase;
   97 
   98         error = agp_generic_attach(dev);
   99         if (error)
  100                 return error;
  101 
  102         sc->initial_aperture = AGP_GET_APERTURE(dev);
  103         if (sc->initial_aperture == 0) {
  104                 device_printf(dev, "bad initial aperture size, disabling\n");
  105                 agp_generic_detach(dev);
  106                 return ENXIO;
  107         }
  108 
  109         for (;;) {
  110                 gatt = agp_alloc_gatt(dev);
  111                 if (gatt)
  112                         break;
  113 
  114                 /*
  115                  * Probably contigmalloc failure. Try reducing the
  116                  * aperture so that the gatt size reduces.
  117                  */
  118                 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
  119                         agp_generic_detach(dev);
  120                         return ENOMEM;
  121                 }
  122         }
  123         sc->gatt = gatt;
  124 
  125         /* Install the gatt. */
  126         attbase = pci_read_config(dev, AGP_ALI_ATTBASE, 4);
  127         pci_write_config(dev, AGP_ALI_ATTBASE, gatt->ag_physical |
  128             (attbase & 0xfff), 4);
  129         
  130         /* Enable the TLB. */
  131         pci_write_config(dev, AGP_ALI_TLBCTRL, 0x10, 1);
  132 
  133         return 0;
  134 }
  135 
  136 static int
  137 agp_ali_detach(device_t dev)
  138 {
  139         struct agp_ali_softc *sc = device_get_softc(dev);
  140         u_int32_t attbase;
  141 
  142         agp_free_cdev(dev);
  143 
  144         /* Disable the TLB.. */
  145         pci_write_config(dev, AGP_ALI_TLBCTRL, 0x90, 1);
  146 
  147         /* Put the aperture back the way it started. */
  148         AGP_SET_APERTURE(dev, sc->initial_aperture);
  149         attbase = pci_read_config(dev, AGP_ALI_ATTBASE, 4);
  150         pci_write_config(dev, AGP_ALI_ATTBASE, attbase & 0xfff, 4);
  151 
  152         agp_free_gatt(sc->gatt);
  153         agp_free_res(dev);
  154         return 0;
  155 }
  156 
  157 #define M 1024*1024
  158 
  159 static u_int32_t agp_ali_table[] = {
  160         0,                      /* 0 - invalid */
  161         1,                      /* 1 - invalid */
  162         2,                      /* 2 - invalid */
  163         4*M,                    /* 3 - invalid */
  164         8*M,                    /* 4 - invalid */
  165         0,                      /* 5 - invalid */
  166         16*M,                   /* 6 - invalid */
  167         32*M,                   /* 7 - invalid */
  168         64*M,                   /* 8 - invalid */
  169         128*M,                  /* 9 - invalid */
  170         256*M,                  /* 10 - invalid */
  171 };
  172 #define agp_ali_table_size NELEM(agp_ali_table)
  173 
  174 static u_int32_t
  175 agp_ali_get_aperture(device_t dev)
  176 {
  177         /*
  178          * The aperture size is derived from the low bits of attbase.
  179          * I'm not sure this is correct..
  180          */
  181         int i = pci_read_config(dev, AGP_ALI_ATTBASE, 4) & 0xf;
  182         if (i >= agp_ali_table_size)
  183                 return 0;
  184         return agp_ali_table[i];
  185 }
  186 
  187 static int
  188 agp_ali_set_aperture(device_t dev, u_int32_t aperture)
  189 {
  190         int i;
  191         u_int32_t attbase;
  192 
  193         for (i = 0; i < agp_ali_table_size; i++)
  194                 if (agp_ali_table[i] == aperture)
  195                         break;
  196         if (i == agp_ali_table_size)
  197                 return EINVAL;
  198 
  199         attbase = pci_read_config(dev, AGP_ALI_ATTBASE, 4);
  200         pci_write_config(dev, AGP_ALI_ATTBASE, (attbase & ~0xf) | i, 4);
  201         return 0;
  202 }
  203 
  204 static int
  205 agp_ali_bind_page(device_t dev, vm_offset_t offset, vm_offset_t physical)
  206 {
  207         struct agp_ali_softc *sc = device_get_softc(dev);
  208 
  209         if (offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  210                 return EINVAL;
  211 
  212         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
  213         return 0;
  214 }
  215 
  216 static int
  217 agp_ali_unbind_page(device_t dev, vm_offset_t offset)
  218 {
  219         struct agp_ali_softc *sc = device_get_softc(dev);
  220 
  221         if (offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  222                 return EINVAL;
  223 
  224         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
  225         return 0;
  226 }
  227 
  228 static void
  229 agp_ali_flush_tlb(device_t dev)
  230 {
  231         pci_write_config(dev, AGP_ALI_TLBCTRL, 0x90, 1);
  232         pci_write_config(dev, AGP_ALI_TLBCTRL, 0x10, 1);
  233 }
  234 
  235 static device_method_t agp_ali_methods[] = {
  236         /* Device interface */
  237         DEVMETHOD(device_probe,         agp_ali_probe),
  238         DEVMETHOD(device_attach,        agp_ali_attach),
  239         DEVMETHOD(device_detach,        agp_ali_detach),
  240         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  241         DEVMETHOD(device_suspend,       bus_generic_suspend),
  242         DEVMETHOD(device_resume,        bus_generic_resume),
  243 
  244         /* AGP interface */
  245         DEVMETHOD(agp_get_aperture,     agp_ali_get_aperture),
  246         DEVMETHOD(agp_set_aperture,     agp_ali_set_aperture),
  247         DEVMETHOD(agp_bind_page,        agp_ali_bind_page),
  248         DEVMETHOD(agp_unbind_page,      agp_ali_unbind_page),
  249         DEVMETHOD(agp_flush_tlb,        agp_ali_flush_tlb),
  250         DEVMETHOD(agp_enable,           agp_generic_enable),
  251         DEVMETHOD(agp_alloc_memory,     agp_generic_alloc_memory),
  252         DEVMETHOD(agp_free_memory,      agp_generic_free_memory),
  253         DEVMETHOD(agp_bind_memory,      agp_generic_bind_memory),
  254         DEVMETHOD(agp_unbind_memory,    agp_generic_unbind_memory),
  255 
  256         DEVMETHOD_END
  257 };
  258 
  259 static driver_t agp_ali_driver = {
  260         "agp",
  261         agp_ali_methods,
  262         sizeof(struct agp_ali_softc),
  263 };
  264 
  265 static devclass_t agp_devclass;
  266 
  267 DRIVER_MODULE(agp_ali, pci, agp_ali_driver, agp_devclass, NULL, NULL);
  268 MODULE_DEPEND(agp_ali, agp, 1, 1, 1);
  269 MODULE_DEPEND(agp_ali, pci, 1, 1, 1);

Cache object: d65069229cb39dd47104c48c3752d5d4


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