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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include "opt_bus.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/module.h>
   37 #include <sys/bus.h>
   38 #include <sys/lock.h>
   39 #include <sys/mutex.h>
   40 #include <sys/proc.h>
   41 
   42 #include <dev/pci/pcivar.h>
   43 #include <dev/pci/pcireg.h>
   44 #include <pci/agppriv.h>
   45 #include <pci/agpreg.h>
   46 
   47 #include <vm/vm.h>
   48 #include <vm/vm_object.h>
   49 #include <vm/pmap.h>
   50 
   51 struct agp_ali_softc {
   52         struct agp_softc agp;
   53         u_int32_t       initial_aperture; /* aperture size at startup */
   54         struct agp_gatt *gatt;
   55 };
   56 
   57 static const char*
   58 agp_ali_match(device_t dev)
   59 {
   60         if (pci_get_class(dev) != PCIC_BRIDGE
   61             || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
   62                 return NULL;
   63 
   64         if (agp_find_caps(dev) == 0)
   65                 return NULL;
   66 
   67         switch (pci_get_devid(dev)) {
   68         case 0x167110b9:
   69                 return ("Ali M1671 host to AGP bridge");
   70         case 0x154110b9:
   71                 return ("Ali M1541 host to AGP bridge");
   72         case 0x162110b9:
   73                 return ("Ali M1621 host to AGP bridge");
   74         };
   75 
   76         return NULL;
   77 }
   78 
   79 static int
   80 agp_ali_probe(device_t dev)
   81 {
   82         const char *desc;
   83 
   84         if (resource_disabled("agp", device_get_unit(dev)))
   85                 return (ENXIO);
   86         desc = agp_ali_match(dev);
   87         if (desc) {
   88                 device_set_desc(dev, desc);
   89                 return BUS_PROBE_DEFAULT;
   90         }
   91 
   92         return ENXIO;
   93 }
   94 
   95 static int
   96 agp_ali_attach(device_t dev)
   97 {
   98         struct agp_ali_softc *sc = device_get_softc(dev);
   99         struct agp_gatt *gatt;
  100         int error;
  101         u_int32_t attbase;
  102 
  103         error = agp_generic_attach(dev);
  104         if (error)
  105                 return error;
  106 
  107         sc->initial_aperture = AGP_GET_APERTURE(dev);
  108         if (sc->initial_aperture == 0) {
  109                 device_printf(dev, "bad initial aperture size, disabling\n");
  110                 return ENXIO;
  111         }
  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         attbase = pci_read_config(dev, AGP_ALI_ATTBASE, 4);
  131         pci_write_config(dev, AGP_ALI_ATTBASE, gatt->ag_physical |
  132             (attbase & 0xfff), 4);
  133         
  134         /* Enable the TLB. */
  135         pci_write_config(dev, AGP_ALI_TLBCTRL, 0x10, 1);
  136 
  137         return 0;
  138 }
  139 
  140 static int
  141 agp_ali_detach(device_t dev)
  142 {
  143         struct agp_ali_softc *sc = device_get_softc(dev);
  144         u_int32_t attbase;
  145 
  146         agp_free_cdev(dev);
  147 
  148         /* Disable the TLB.. */
  149         pci_write_config(dev, AGP_ALI_TLBCTRL, 0x90, 1);
  150 
  151         /* Put the aperture back the way it started. */
  152         AGP_SET_APERTURE(dev, sc->initial_aperture);
  153         attbase = pci_read_config(dev, AGP_ALI_ATTBASE, 4);
  154         pci_write_config(dev, AGP_ALI_ATTBASE, attbase & 0xfff, 4);
  155 
  156         agp_free_gatt(sc->gatt);
  157         agp_free_res(dev);
  158         return 0;
  159 }
  160 
  161 #define M 1024*1024
  162 
  163 static u_int32_t agp_ali_table[] = {
  164         0,                      /* 0 - invalid */
  165         1,                      /* 1 - invalid */
  166         2,                      /* 2 - invalid */
  167         4*M,                    /* 3 - invalid */
  168         8*M,                    /* 4 - invalid */
  169         0,                      /* 5 - invalid */
  170         16*M,                   /* 6 - invalid */
  171         32*M,                   /* 7 - invalid */
  172         64*M,                   /* 8 - invalid */
  173         128*M,                  /* 9 - invalid */
  174         256*M,                  /* 10 - invalid */
  175 };
  176 #define agp_ali_table_size (sizeof(agp_ali_table) / sizeof(agp_ali_table[0]))
  177 
  178 static u_int32_t
  179 agp_ali_get_aperture(device_t dev)
  180 {
  181         /*
  182          * The aperture size is derived from the low bits of attbase.
  183          * I'm not sure this is correct..
  184          */
  185         int i = pci_read_config(dev, AGP_ALI_ATTBASE, 4) & 0xf;
  186         if (i >= agp_ali_table_size)
  187                 return 0;
  188         return agp_ali_table[i];
  189 }
  190 
  191 static int
  192 agp_ali_set_aperture(device_t dev, u_int32_t aperture)
  193 {
  194         int i;
  195         u_int32_t attbase;
  196 
  197         for (i = 0; i < agp_ali_table_size; i++)
  198                 if (agp_ali_table[i] == aperture)
  199                         break;
  200         if (i == agp_ali_table_size)
  201                 return EINVAL;
  202 
  203         attbase = pci_read_config(dev, AGP_ALI_ATTBASE, 4);
  204         pci_write_config(dev, AGP_ALI_ATTBASE, (attbase & ~0xf) | i, 4);
  205         return 0;
  206 }
  207 
  208 static int
  209 agp_ali_bind_page(device_t dev, int offset, vm_offset_t physical)
  210 {
  211         struct agp_ali_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] = physical;
  217         return 0;
  218 }
  219 
  220 static int
  221 agp_ali_unbind_page(device_t dev, int offset)
  222 {
  223         struct agp_ali_softc *sc = device_get_softc(dev);
  224 
  225         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  226                 return EINVAL;
  227 
  228         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
  229         return 0;
  230 }
  231 
  232 static void
  233 agp_ali_flush_tlb(device_t dev)
  234 {
  235         pci_write_config(dev, AGP_ALI_TLBCTRL, 0x90, 1);
  236         pci_write_config(dev, AGP_ALI_TLBCTRL, 0x10, 1);
  237 }
  238 
  239 static device_method_t agp_ali_methods[] = {
  240         /* Device interface */
  241         DEVMETHOD(device_probe,         agp_ali_probe),
  242         DEVMETHOD(device_attach,        agp_ali_attach),
  243         DEVMETHOD(device_detach,        agp_ali_detach),
  244         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  245         DEVMETHOD(device_suspend,       bus_generic_suspend),
  246         DEVMETHOD(device_resume,        bus_generic_resume),
  247 
  248         /* AGP interface */
  249         DEVMETHOD(agp_get_aperture,     agp_ali_get_aperture),
  250         DEVMETHOD(agp_set_aperture,     agp_ali_set_aperture),
  251         DEVMETHOD(agp_bind_page,        agp_ali_bind_page),
  252         DEVMETHOD(agp_unbind_page,      agp_ali_unbind_page),
  253         DEVMETHOD(agp_flush_tlb,        agp_ali_flush_tlb),
  254         DEVMETHOD(agp_enable,           agp_generic_enable),
  255         DEVMETHOD(agp_alloc_memory,     agp_generic_alloc_memory),
  256         DEVMETHOD(agp_free_memory,      agp_generic_free_memory),
  257         DEVMETHOD(agp_bind_memory,      agp_generic_bind_memory),
  258         DEVMETHOD(agp_unbind_memory,    agp_generic_unbind_memory),
  259 
  260         { 0, 0 }
  261 };
  262 
  263 static driver_t agp_ali_driver = {
  264         "agp",
  265         agp_ali_methods,
  266         sizeof(struct agp_ali_softc),
  267 };
  268 
  269 static devclass_t agp_devclass;
  270 
  271 DRIVER_MODULE(agp_ali, hostb, agp_ali_driver, agp_devclass, 0, 0);
  272 MODULE_DEPEND(agp_ali, agp, 1, 1, 1);
  273 MODULE_DEPEND(agp_ali, pci, 1, 1, 1);

Cache object: 25bb3305dd437c693b597229f8019594


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