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_sis.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_sis_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_sis_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 0x00011039:
   66                 return ("SiS 5591 host to AGP bridge");
   67         case 0x06481039:
   68                 return ("SiS 648 host to AGP bridge");
   69         };
   70 
   71         if (pci_get_vendor(dev) == 0x1039)
   72                 return ("SIS Generic host to PCI bridge");
   73 
   74         return NULL;
   75 }
   76 
   77 static int
   78 agp_sis_probe(device_t dev)
   79 {
   80         const char *desc;
   81 
   82         desc = agp_sis_match(dev);
   83         if (desc) {
   84                 device_verbose(dev);
   85                 device_set_desc(dev, desc);
   86                 return 0;
   87         }
   88 
   89         return ENXIO;
   90 }
   91 
   92 static int
   93 agp_sis_attach(device_t dev)
   94 {
   95         struct agp_sis_softc *sc = device_get_softc(dev);
   96         struct agp_gatt *gatt;
   97         int error;
   98 
   99         error = agp_generic_attach(dev);
  100         if (error)
  101                 return error;
  102 
  103         sc->initial_aperture = AGP_GET_APERTURE(dev);
  104 
  105         for (;;) {
  106                 gatt = agp_alloc_gatt(dev);
  107                 if (gatt)
  108                         break;
  109 
  110                 /*
  111                  * Probably contigmalloc failure. Try reducing the
  112                  * aperture so that the gatt size reduces.
  113                  */
  114                 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
  115                         agp_generic_detach(dev);
  116                         return ENOMEM;
  117                 }
  118         }
  119         sc->gatt = gatt;
  120 
  121         /* Install the gatt. */
  122         pci_write_config(dev, AGP_SIS_ATTBASE, gatt->ag_physical, 4);
  123         
  124         /* Enable the aperture. */
  125         pci_write_config(dev, AGP_SIS_WINCTRL,
  126                          pci_read_config(dev, AGP_SIS_WINCTRL, 1) | 3, 1);
  127 
  128         /*
  129          * Enable the TLB and make it automatically invalidate entries
  130          * when the GATT is written.
  131          */
  132         pci_write_config(dev, AGP_SIS_TLBCTRL, 0x05, 1);
  133 
  134         return 0;
  135 }
  136 
  137 static int
  138 agp_sis_detach(device_t dev)
  139 {
  140         struct agp_sis_softc *sc = device_get_softc(dev);
  141         int error;
  142 
  143         error = agp_generic_detach(dev);
  144         if (error)
  145                 return error;
  146 
  147         /* Disable the aperture.. */
  148         pci_write_config(dev, AGP_SIS_WINCTRL,
  149                          pci_read_config(dev, AGP_SIS_WINCTRL, 1) & ~3, 1);
  150 
  151         /* and the TLB. */
  152         pci_write_config(dev, AGP_SIS_TLBCTRL, 0, 1);
  153 
  154         /* Put the aperture back the way it started. */
  155         AGP_SET_APERTURE(dev, sc->initial_aperture);
  156 
  157         agp_free_gatt(sc->gatt);
  158         return 0;
  159 }
  160 
  161 static u_int32_t
  162 agp_sis_get_aperture(device_t dev)
  163 {
  164         int gws;
  165 
  166         /*
  167          * The aperture size is equal to 4M<<gws.
  168          */
  169         gws = (pci_read_config(dev, AGP_SIS_WINCTRL, 1) & 0x70) >> 4;
  170         return (4*1024*1024) << gws;
  171 }
  172 
  173 static int
  174 agp_sis_set_aperture(device_t dev, u_int32_t aperture)
  175 {
  176         int gws;
  177 
  178         /*
  179          * Check for a power of two and make sure its within the
  180          * programmable range.
  181          */
  182         if (aperture & (aperture - 1)
  183             || aperture < 4*1024*1024
  184             || aperture > 256*1024*1024)
  185                 return EINVAL;
  186 
  187         gws = ffs(aperture / 4*1024*1024) - 1;
  188         
  189         pci_write_config(dev, AGP_SIS_WINCTRL,
  190                          ((pci_read_config(dev, AGP_SIS_WINCTRL, 1) & ~0x70)
  191                           | gws << 4), 1);
  192 
  193         return 0;
  194 }
  195 
  196 static int
  197 agp_sis_bind_page(device_t dev, int offset, vm_offset_t physical)
  198 {
  199         struct agp_sis_softc *sc = device_get_softc(dev);
  200 
  201         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  202                 return EINVAL;
  203 
  204         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
  205         return 0;
  206 }
  207 
  208 static int
  209 agp_sis_unbind_page(device_t dev, int offset)
  210 {
  211         struct agp_sis_softc *sc = device_get_softc(dev);
  212 
  213         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  214                 return EINVAL;
  215 
  216         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
  217         return 0;
  218 }
  219 
  220 static void
  221 agp_sis_flush_tlb(device_t dev)
  222 {
  223         pci_write_config(dev, AGP_SIS_TLBFLUSH, 0x02, 1);
  224 }
  225 
  226 static device_method_t agp_sis_methods[] = {
  227         /* Device interface */
  228         DEVMETHOD(device_probe,         agp_sis_probe),
  229         DEVMETHOD(device_attach,        agp_sis_attach),
  230         DEVMETHOD(device_detach,        agp_sis_detach),
  231         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  232         DEVMETHOD(device_suspend,       bus_generic_suspend),
  233         DEVMETHOD(device_resume,        bus_generic_resume),
  234 
  235         /* AGP interface */
  236         DEVMETHOD(agp_get_aperture,     agp_sis_get_aperture),
  237         DEVMETHOD(agp_set_aperture,     agp_sis_set_aperture),
  238         DEVMETHOD(agp_bind_page,        agp_sis_bind_page),
  239         DEVMETHOD(agp_unbind_page,      agp_sis_unbind_page),
  240         DEVMETHOD(agp_flush_tlb,        agp_sis_flush_tlb),
  241         DEVMETHOD(agp_enable,           agp_generic_enable),
  242         DEVMETHOD(agp_alloc_memory,     agp_generic_alloc_memory),
  243         DEVMETHOD(agp_free_memory,      agp_generic_free_memory),
  244         DEVMETHOD(agp_bind_memory,      agp_generic_bind_memory),
  245         DEVMETHOD(agp_unbind_memory,    agp_generic_unbind_memory),
  246 
  247         { 0, 0 }
  248 };
  249 
  250 static driver_t agp_sis_driver = {
  251         "agp",
  252         agp_sis_methods,
  253         sizeof(struct agp_sis_softc),
  254 };
  255 
  256 static devclass_t agp_devclass;
  257 
  258 DRIVER_MODULE(agp_sis, pci, agp_sis_driver, agp_devclass, 0, 0);

Cache object: 3f09b02579a96f1d414b1452e058e195


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