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  *      $FreeBSD$
   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 #include <machine/clock.h>
   48 #include <machine/bus.h>
   49 #include <machine/resource.h>
   50 #include <sys/rman.h>
   51 
   52 MALLOC_DECLARE(M_AGP);
   53 
   54 #define READ2(off)      bus_space_read_2(sc->bst, sc->bsh, off)
   55 #define READ4(off)      bus_space_read_4(sc->bst, sc->bsh, off)
   56 #define WRITE2(off,v)   bus_space_write_2(sc->bst, sc->bsh, off, v)
   57 #define WRITE4(off,v)   bus_space_write_4(sc->bst, sc->bsh, off, v)
   58 
   59 struct agp_amd_gatt {
   60         u_int32_t       ag_entries;
   61         u_int32_t      *ag_virtual;     /* virtual address of gatt */
   62         vm_offset_t     ag_physical;
   63         u_int32_t      *ag_vdir;        /* virtual address of page dir */
   64         vm_offset_t     ag_pdir;        /* physical address of page dir */
   65 };
   66 
   67 struct agp_amd_softc {
   68         struct agp_softc agp;
   69         struct resource *regs;  /* memory mapped control registers */
   70         bus_space_tag_t bst;    /* bus_space tag */
   71         bus_space_handle_t bsh; /* bus_space handle */
   72         u_int32_t       initial_aperture; /* aperture size at startup */
   73         struct agp_amd_gatt *gatt;
   74 };
   75 
   76 static struct agp_amd_gatt *
   77 agp_amd_alloc_gatt(device_t dev)
   78 {
   79         u_int32_t apsize = AGP_GET_APERTURE(dev);
   80         u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
   81         struct agp_amd_gatt *gatt;
   82         int i, npages, pdir_offset;
   83 
   84         if (bootverbose)
   85                 device_printf(dev,
   86                               "allocating GATT for aperture of size %dM\n",
   87                               apsize / (1024*1024));
   88 
   89         gatt = malloc(sizeof(struct agp_amd_gatt), M_AGP, M_NOWAIT);
   90         if (!gatt)
   91                 return 0;
   92 
   93         /*
   94          * The AMD751 uses a page directory to map a non-contiguous
   95          * gatt so we don't need to use contigmalloc.
   96          * Malloc individual gatt pages and map them into the page
   97          * directory.
   98          */
   99         gatt->ag_entries = entries;
  100         gatt->ag_virtual = malloc(entries * sizeof(u_int32_t),
  101                                   M_AGP, M_NOWAIT);
  102         if (!gatt->ag_virtual) {
  103                 if (bootverbose)
  104                         device_printf(dev, "allocation failed\n");
  105                 free(gatt, M_AGP);
  106                 return 0;
  107         }
  108         bzero(gatt->ag_virtual, entries * sizeof(u_int32_t));
  109 
  110         /*
  111          * Allocate the page directory.
  112          */
  113         gatt->ag_vdir = malloc(AGP_PAGE_SIZE, M_AGP, M_NOWAIT);
  114 
  115         if (!gatt->ag_vdir) {
  116                 if (bootverbose)
  117                         device_printf(dev,
  118                                       "failed to allocate page directory\n");
  119                 free(gatt->ag_virtual, M_AGP);
  120                 free(gatt, M_AGP);
  121                 return 0;
  122         }
  123         bzero(gatt->ag_vdir, AGP_PAGE_SIZE);
  124         gatt->ag_pdir = vtophys((vm_offset_t) gatt->ag_vdir);
  125         if(bootverbose)
  126                 device_printf(dev, "gatt -> ag_pdir %8x\n",
  127                                 (vm_offset_t)gatt->ag_pdir);
  128         /*
  129          * Allocate the gatt pages
  130          */
  131         gatt->ag_entries = entries;
  132         if(bootverbose)
  133                 device_printf(dev, "allocating GATT for %d AGP page entries\n", 
  134                         gatt->ag_entries);
  135         gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
  136 
  137         /*
  138          * Map the pages of the GATT into the page directory.
  139          *
  140          * The GATT page addresses are mapped into the directory offset by
  141          * an amount dependent on the base address of the aperture. This
  142          * is and offset into the page directory, not an offset added to
  143          * the addresses of the gatt pages.
  144          */
  145 
  146         pdir_offset = pci_read_config(dev, AGP_AMD751_APBASE, 4) >> 22;
  147 
  148         npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1)
  149                   >> AGP_PAGE_SHIFT);
  150 
  151         for (i = 0; i < npages; i++) {
  152                 vm_offset_t va;
  153                 vm_offset_t pa;
  154 
  155                 va = ((vm_offset_t) gatt->ag_virtual) + i * AGP_PAGE_SIZE;
  156                 pa = vtophys(va);
  157                 gatt->ag_vdir[i + pdir_offset] = pa | 1;
  158         }
  159 
  160         /*
  161          * Make sure the chipset can see everything.
  162          */
  163         agp_flush_cache();
  164 
  165         return gatt;
  166 }
  167 
  168 static void
  169 agp_amd_free_gatt(struct agp_amd_gatt *gatt)
  170 {
  171         free(gatt->ag_virtual, M_AGP);
  172         free(gatt->ag_vdir, M_AGP);
  173         free(gatt, M_AGP);
  174 }
  175 
  176 static const char*
  177 agp_amd_match(device_t dev)
  178 {
  179         if (pci_get_class(dev) != PCIC_BRIDGE
  180             || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
  181                 return NULL;
  182 
  183         if (agp_find_caps(dev) == 0)
  184                 return NULL;
  185 
  186         switch (pci_get_devid(dev)) {
  187 
  188         case 0x70061022:
  189                 return ("AMD 751 host to AGP bridge");
  190         
  191         case 0x700e1022:
  192                 return ("AMD 761 host to AGP bridge");
  193 
  194         case 0x700c1022:
  195                 return ("AMD 762 host to AGP bridge");
  196 
  197         };
  198 
  199         return NULL;
  200 }
  201 
  202 static int
  203 agp_amd_probe(device_t dev)
  204 {
  205         const char *desc;
  206 
  207         desc = agp_amd_match(dev);
  208         if (desc) {
  209                 device_verbose(dev);
  210                 device_set_desc(dev, desc);
  211                 return 0;
  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(dev, SYS_RES_MEMORY, &rid,
  230                                       0, ~0, 1, 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         int error;
  281 
  282         error = agp_generic_detach(dev);
  283         if (error)
  284                 return error;
  285 
  286         /* Disable the TLB.. */
  287         WRITE2(AGP_AMD751_STATUS,
  288                READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE);
  289         
  290         /* Disable host-agp sync */
  291         pci_write_config(dev, AGP_AMD751_MODECTRL, 0x00, 1);
  292         
  293         /* Clear the GATT base */
  294         WRITE4(AGP_AMD751_ATTBASE, 0);
  295 
  296         /* Put the aperture back the way it started. */
  297         AGP_SET_APERTURE(dev, sc->initial_aperture);
  298 
  299         agp_amd_free_gatt(sc->gatt);
  300 
  301         bus_release_resource(dev, SYS_RES_MEMORY,
  302                              AGP_AMD751_REGISTERS, sc->regs);
  303 
  304         return 0;
  305 }
  306 
  307 static u_int32_t
  308 agp_amd_get_aperture(device_t dev)
  309 {
  310         int vas;
  311 
  312         /*
  313          * The aperture size is equal to 32M<<vas.
  314          */
  315         vas = (pci_read_config(dev, AGP_AMD751_APCTRL, 1) & 0x06) >> 1;
  316         return (32*1024*1024) << vas;
  317 }
  318 
  319 static int
  320 agp_amd_set_aperture(device_t dev, u_int32_t aperture)
  321 {
  322         int vas;
  323 
  324         /*
  325          * Check for a power of two and make sure its within the
  326          * programmable range.
  327          */
  328         if (aperture & (aperture - 1)
  329             || aperture < 32*1024*1024
  330             || aperture > 2U*1024*1024*1024)
  331                 return EINVAL;
  332 
  333         vas = ffs(aperture / 32*1024*1024) - 1;
  334         
  335         /* 
  336          * While the size register is bits 1-3 of APCTRL, bit 0 must be
  337          * set for the size value to be 'valid'
  338          */
  339         pci_write_config(dev, AGP_AMD751_APCTRL,
  340                          (((pci_read_config(dev, AGP_AMD751_APCTRL, 1) & ~0x06)
  341                           | ((vas << 1) | 1))), 1);
  342 
  343         return 0;
  344 }
  345 
  346 static int
  347 agp_amd_bind_page(device_t dev, int offset, vm_offset_t physical)
  348 {
  349         struct agp_amd_softc *sc = device_get_softc(dev);
  350 
  351         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  352                 return EINVAL;
  353 
  354         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1;
  355 
  356         /* invalidate the cache */
  357         AGP_FLUSH_TLB(dev);
  358         return 0;
  359 }
  360 
  361 static int
  362 agp_amd_unbind_page(device_t dev, int offset)
  363 {
  364         struct agp_amd_softc *sc = device_get_softc(dev);
  365 
  366         if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  367                 return EINVAL;
  368 
  369         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
  370         return 0;
  371 }
  372 
  373 static void
  374 agp_amd_flush_tlb(device_t dev)
  375 {
  376         struct agp_amd_softc *sc = device_get_softc(dev);
  377 
  378         /* Set the cache invalidate bit and wait for the chipset to clear */
  379         WRITE4(AGP_AMD751_TLBCTRL, 1);
  380         do {
  381                 DELAY(1);
  382         } while (READ4(AGP_AMD751_TLBCTRL));
  383 }
  384 
  385 static device_method_t agp_amd_methods[] = {
  386         /* Device interface */
  387         DEVMETHOD(device_probe,         agp_amd_probe),
  388         DEVMETHOD(device_attach,        agp_amd_attach),
  389         DEVMETHOD(device_detach,        agp_amd_detach),
  390         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  391         DEVMETHOD(device_suspend,       bus_generic_suspend),
  392         DEVMETHOD(device_resume,        bus_generic_resume),
  393 
  394         /* AGP interface */
  395         DEVMETHOD(agp_get_aperture,     agp_amd_get_aperture),
  396         DEVMETHOD(agp_set_aperture,     agp_amd_set_aperture),
  397         DEVMETHOD(agp_bind_page,        agp_amd_bind_page),
  398         DEVMETHOD(agp_unbind_page,      agp_amd_unbind_page),
  399         DEVMETHOD(agp_flush_tlb,        agp_amd_flush_tlb),
  400         DEVMETHOD(agp_enable,           agp_generic_enable),
  401         DEVMETHOD(agp_alloc_memory,     agp_generic_alloc_memory),
  402         DEVMETHOD(agp_free_memory,      agp_generic_free_memory),
  403         DEVMETHOD(agp_bind_memory,      agp_generic_bind_memory),
  404         DEVMETHOD(agp_unbind_memory,    agp_generic_unbind_memory),
  405 
  406         { 0, 0 }
  407 };
  408 
  409 static driver_t agp_amd_driver = {
  410         "agp",
  411         agp_amd_methods,
  412         sizeof(struct agp_amd_softc),
  413 };
  414 
  415 static devclass_t agp_devclass;
  416 
  417 DRIVER_MODULE(agp_amd, pci, agp_amd_driver, agp_devclass, 0, 0);
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FreeBSD/Linux Kernel Cross Reference sys/pci/agp_amd.c

FreeBSD/Linux Kernel Cross Reference
sys/pci/agp_amd.c
