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_amd.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 #include <machine/bus.h>
   51 #include <machine/resource.h>
   52 #include <sys/rman.h>
   53 
   54 MALLOC_DECLARE(M_AGP);
   55 
   56 #define READ2(off)      bus_space_read_2(sc->bst, sc->bsh, off)
   57 #define READ4(off)      bus_space_read_4(sc->bst, sc->bsh, off)
   58 #define WRITE2(off,v)   bus_space_write_2(sc->bst, sc->bsh, off, v)
   59 #define WRITE4(off,v)   bus_space_write_4(sc->bst, sc->bsh, off, v)
   60 
   61 struct agp_amd_gatt {
   62         u_int32_t       ag_entries;
   63         u_int32_t      *ag_virtual;     /* virtual address of gatt */
   64         vm_offset_t     ag_physical;
   65         u_int32_t      *ag_vdir;        /* virtual address of page dir */
   66         vm_offset_t     ag_pdir;        /* physical address of page dir */
   67 };
   68 
   69 struct agp_amd_softc {
   70         struct agp_softc        agp;
   71         struct resource        *regs;   /* memory mapped control registers */
   72         bus_space_tag_t         bst;    /* bus_space tag */
   73         bus_space_handle_t      bsh;    /* bus_space handle */
   74         u_int32_t               initial_aperture; /* aperture size at startup */
   75         struct agp_amd_gatt    *gatt;
   76 };
   77 
   78 static struct agp_amd_gatt *
   79 agp_amd_alloc_gatt(device_t dev)
   80 {
   81         u_int32_t apsize = AGP_GET_APERTURE(dev);
   82         u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
   83         struct agp_amd_gatt *gatt;
   84         int i, npages, pdir_offset;
   85 
   86         if (bootverbose)
   87                 device_printf(dev,
   88                               "allocating GATT for aperture of size %dM\n",
   89                               apsize / (1024*1024));
   90 
   91         gatt = malloc(sizeof(struct agp_amd_gatt), M_AGP, M_NOWAIT);
   92         if (!gatt)
   93                 return 0;
   94 
   95         /*
   96          * The AMD751 uses a page directory to map a non-contiguous
   97          * gatt so we don't need to use contigmalloc.
   98          * Malloc individual gatt pages and map them into the page
   99          * directory.
  100          */
  101         gatt->ag_entries = entries;
  102         gatt->ag_virtual = malloc(entries * sizeof(u_int32_t),
  103                                   M_AGP, M_NOWAIT);
  104         if (!gatt->ag_virtual) {
  105                 if (bootverbose)
  106                         device_printf(dev, "allocation failed\n");
  107                 free(gatt, M_AGP);
  108                 return 0;
  109         }
  110         bzero(gatt->ag_virtual, entries * sizeof(u_int32_t));
  111 
  112         /*
  113          * Allocate the page directory.
  114          */
  115         gatt->ag_vdir = malloc(AGP_PAGE_SIZE, M_AGP, M_NOWAIT);
  116         if (!gatt->ag_vdir) {
  117                 if (bootverbose)
  118                         device_printf(dev,
  119                                       "failed to allocate page directory\n");
  120                 free(gatt->ag_virtual, M_AGP);
  121                 free(gatt, M_AGP);
  122                 return 0;
  123         }
  124         bzero(gatt->ag_vdir, AGP_PAGE_SIZE);
  125 
  126         gatt->ag_pdir = vtophys((vm_offset_t) gatt->ag_vdir);
  127         if(bootverbose)
  128                 device_printf(dev, "gatt -> ag_pdir %#lx\n",
  129                     (u_long)gatt->ag_pdir);
  130         /*
  131          * Allocate the gatt pages
  132          */
  133         gatt->ag_entries = entries;
  134         if(bootverbose)
  135                 device_printf(dev, "allocating GATT for %d AGP page entries\n", 
  136                         gatt->ag_entries);
  137 
  138         gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
  139 
  140         /*
  141          * Map the pages of the GATT into the page directory.
  142          *
  143          * The GATT page addresses are mapped into the directory offset by
  144          * an amount dependent on the base address of the aperture. This
  145          * is and offset into the page directory, not an offset added to
  146          * the addresses of the gatt pages.
  147          */
  148 
  149         pdir_offset = pci_read_config(dev, AGP_AMD751_APBASE, 4) >> 22;
  150 
  151         npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1)
  152                   >> AGP_PAGE_SHIFT);
  153 
  154         for (i = 0; i < npages; i++) {
  155                 vm_offset_t va;
  156                 vm_offset_t pa;
  157 
  158                 va = ((vm_offset_t) gatt->ag_virtual) + i * AGP_PAGE_SIZE;
  159                 pa = vtophys(va);
  160                 gatt->ag_vdir[i + pdir_offset] = pa | 1;
  161         }
  162 
  163         /*
  164          * Make sure the chipset can see everything.
  165          */
  166         agp_flush_cache();
  167 
  168         return gatt;
  169 }
  170 
  171 static void
  172 agp_amd_free_gatt(struct agp_amd_gatt *gatt)
  173 {
  174         free(gatt->ag_virtual, M_AGP);
  175         free(gatt->ag_vdir, M_AGP);
  176         free(gatt, M_AGP);
  177 }
  178 
  179 static const char*
  180 agp_amd_match(device_t dev)
  181 {
  182         if (pci_get_class(dev) != PCIC_BRIDGE
  183             || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
  184                 return NULL;
  185 
  186         if (agp_find_caps(dev) == 0)
  187                 return NULL;
  188 
  189         switch (pci_get_devid(dev)) {
  190         case 0x70061022:
  191                 return ("AMD 751 host to AGP bridge");
  192         case 0x700e1022:
  193                 return ("AMD 761 host to AGP bridge");
  194         case 0x700c1022:
  195                 return ("AMD 762 host to AGP bridge");
  196         };
  197 
  198         return NULL;
  199 }
  200 
  201 static int
  202 agp_amd_probe(device_t dev)
  203 {
  204         const char *desc;
  205 
  206         if (resource_disabled("agp", device_get_unit(dev)))
  207                 return (ENXIO);
  208         desc = agp_amd_match(dev);
  209         if (desc) {
  210                 device_set_desc(dev, desc);
  211                 return BUS_PROBE_DEFAULT;
  212         }
  213 
  214         return ENXIO;
  215 }
  216 
  217 static int
  218 agp_amd_attach(device_t dev)
  219 {
  220         struct agp_amd_softc *sc = device_get_softc(dev);
  221         struct agp_amd_gatt *gatt;
  222         int error, rid;
  223 
  224         error = agp_generic_attach(dev);
  225         if (error)
  226                 return error;
  227 
  228         rid = AGP_AMD751_REGISTERS;
  229         sc->regs = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  230                                           RF_ACTIVE);
  231         if (!sc->regs) {
  232                 agp_generic_detach(dev);
  233                 return ENOMEM;
  234         }
  235 
  236         sc->bst = rman_get_bustag(sc->regs);
  237         sc->bsh = rman_get_bushandle(sc->regs);
  238 
  239         sc->initial_aperture = AGP_GET_APERTURE(dev);
  240 
  241         for (;;) {
  242                 gatt = agp_amd_alloc_gatt(dev);
  243                 if (gatt)
  244                         break;
  245 
  246                 /*
  247                  * Probably contigmalloc failure. Try reducing the
  248                  * aperture so that the gatt size reduces.
  249                  */
  250                 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2))
  251                         return ENOMEM;
  252         }
  253         sc->gatt = gatt;
  254 
  255         /* Install the gatt. */
  256         WRITE4(AGP_AMD751_ATTBASE, gatt->ag_pdir);
  257         
  258         /* Enable synchronisation between host and agp. */
  259         pci_write_config(dev,
  260                          AGP_AMD751_MODECTRL,
  261                          AGP_AMD751_MODECTRL_SYNEN, 1);
  262 
  263         /* Set indexing mode for two-level and enable page dir cache */
  264         pci_write_config(dev,
  265                          AGP_AMD751_MODECTRL2,
  266                          AGP_AMD751_MODECTRL2_GPDCE, 1);
  267 
  268         /* Enable the TLB and flush */
  269         WRITE2(AGP_AMD751_STATUS,
  270                READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE);
  271         AGP_FLUSH_TLB(dev);
  272 
  273         return 0;
  274 }
  275 
  276 static int
  277 agp_amd_detach(device_t dev)
  278 {
  279         struct agp_amd_softc *sc = device_get_softc(dev);
  280 
  281         agp_free_cdev(dev);
  282 
  283         /* Disable the TLB.. */
  284         WRITE2(AGP_AMD751_STATUS,
  285                READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE);
  286         
  287         /* Disable host-agp sync */
  288         pci_write_config(dev, AGP_AMD751_MODECTRL, 0x00, 1);
  289         
  290         /* Clear the GATT base */
  291         WRITE4(AGP_AMD751_ATTBASE, 0);
  292 
  293         /* Put the aperture back the way it started. */
  294         AGP_SET_APERTURE(dev, sc->initial_aperture);
  295 
  296         agp_amd_free_gatt(sc->gatt);
  297         agp_free_res(dev);
  298 
  299         bus_release_resource(dev, SYS_RES_MEMORY,
  300                              AGP_AMD751_REGISTERS, sc->regs);
  301 
  302         return 0;
  303 }
  304 
  305 static u_int32_t
  306 agp_amd_get_aperture(device_t dev)
  307 {
  308         int vas;
  309 
  310         /*
  311          * The aperture size is equal to 32M<<vas.
  312          */
  313         vas = (pci_read_config(dev, AGP_AMD751_APCTRL, 1) & 0x06) >> 1;
  314         return (32*1024*1024) << vas;
  315 }
  316 
  317 static int
  318 agp_amd_set_aperture(device_t dev, u_int32_t aperture)
  319 {
  320         int vas;
  321 
  322         /*
  323          * Check for a power of two and make sure its within the
  324          * programmable range.
  325          */
  326         if (aperture & (aperture - 1)
  327             || aperture < 32*1024*1024
  328             || aperture > 2U*1024*1024*1024)
  329                 return EINVAL;
  330 
  331         vas = ffs(aperture / 32*1024*1024) - 1;
  332         
  333         /* 
  334          * While the size register is bits 1-3 of APCTRL, bit 0 must be
  335          * set for the size value to be 'valid'
  336          */
  337         pci_write_config(dev, AGP_AMD751_APCTRL,
  338                          (((pci_read_config(dev, AGP_AMD751_APCTRL, 1) & ~0x06)
  339                           | ((vas << 1) | 1))), 1);
  340 
  341         return 0;
  342 }
  343 
  344 static int
  345 agp_amd_bind_page(device_t dev, int offset, vm_offset_t physical)
  346 {
  347         struct agp_amd_softc *sc = device_get_softc(dev);
  348 
  349         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  350                 return EINVAL;
  351 
  352         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1;
  353 
  354         /* invalidate the cache */
  355         AGP_FLUSH_TLB(dev);
  356         return 0;
  357 }
  358 
  359 static int
  360 agp_amd_unbind_page(device_t dev, int offset)
  361 {
  362         struct agp_amd_softc *sc = device_get_softc(dev);
  363 
  364         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  365                 return EINVAL;
  366 
  367         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
  368         return 0;
  369 }
  370 
  371 static void
  372 agp_amd_flush_tlb(device_t dev)
  373 {
  374         struct agp_amd_softc *sc = device_get_softc(dev);
  375 
  376         /* Set the cache invalidate bit and wait for the chipset to clear */
  377         WRITE4(AGP_AMD751_TLBCTRL, 1);
  378         do {
  379                 DELAY(1);
  380         } while (READ4(AGP_AMD751_TLBCTRL));
  381 }
  382 
  383 static device_method_t agp_amd_methods[] = {
  384         /* Device interface */
  385         DEVMETHOD(device_probe,         agp_amd_probe),
  386         DEVMETHOD(device_attach,        agp_amd_attach),
  387         DEVMETHOD(device_detach,        agp_amd_detach),
  388         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  389         DEVMETHOD(device_suspend,       bus_generic_suspend),
  390         DEVMETHOD(device_resume,        bus_generic_resume),
  391 
  392         /* AGP interface */
  393         DEVMETHOD(agp_get_aperture,     agp_amd_get_aperture),
  394         DEVMETHOD(agp_set_aperture,     agp_amd_set_aperture),
  395         DEVMETHOD(agp_bind_page,        agp_amd_bind_page),
  396         DEVMETHOD(agp_unbind_page,      agp_amd_unbind_page),
  397         DEVMETHOD(agp_flush_tlb,        agp_amd_flush_tlb),
  398         DEVMETHOD(agp_enable,           agp_generic_enable),
  399         DEVMETHOD(agp_alloc_memory,     agp_generic_alloc_memory),
  400         DEVMETHOD(agp_free_memory,      agp_generic_free_memory),
  401         DEVMETHOD(agp_bind_memory,      agp_generic_bind_memory),
  402         DEVMETHOD(agp_unbind_memory,    agp_generic_unbind_memory),
  403 
  404         { 0, 0 }
  405 };
  406 
  407 static driver_t agp_amd_driver = {
  408         "agp",
  409         agp_amd_methods,
  410         sizeof(struct agp_amd_softc),
  411 };
  412 
  413 static devclass_t agp_devclass;
  414 
  415 DRIVER_MODULE(agp_amd, hostb, agp_amd_driver, agp_devclass, 0, 0);
  416 MODULE_DEPEND(agp_amd, agp, 1, 1, 1);
  417 MODULE_DEPEND(agp_amd, pci, 1, 1, 1);

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