agp_amd.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2000 Doug Rabson
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   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/agp/agppriv.h>
   43 #include <dev/agp/agpreg.h>
   44 #include <dev/pci/pcivar.h>
   45 #include <dev/pci/pcireg.h>
   46 
   47 #include <vm/vm.h>
   48 #include <vm/vm_extern.h>
   49 #include <vm/vm_kern.h>
   50 #include <vm/vm_object.h>
   51 #include <vm/pmap.h>
   52 #include <machine/bus.h>
   53 #include <machine/resource.h>
   54 #include <sys/rman.h>
   55 
   56 MALLOC_DECLARE(M_AGP);
   57 
   58 #define READ2(off)      bus_space_read_2(sc->bst, sc->bsh, off)
   59 #define READ4(off)      bus_space_read_4(sc->bst, sc->bsh, off)
   60 #define WRITE2(off,v)   bus_space_write_2(sc->bst, sc->bsh, off, v)
   61 #define WRITE4(off,v)   bus_space_write_4(sc->bst, sc->bsh, off, v)
   62 
   63 struct agp_amd_gatt {
   64         u_int32_t       ag_entries;
   65         u_int32_t      *ag_virtual;     /* virtual address of gatt */
   66         vm_offset_t     ag_physical;
   67         u_int32_t      *ag_vdir;        /* virtual address of page dir */
   68         vm_offset_t     ag_pdir;        /* physical address of page dir */
   69 };
   70 
   71 struct agp_amd_softc {
   72         struct agp_softc        agp;
   73         struct resource        *regs;   /* memory mapped control registers */
   74         bus_space_tag_t         bst;    /* bus_space tag */
   75         bus_space_handle_t      bsh;    /* bus_space handle */
   76         u_int32_t               initial_aperture; /* aperture size at startup */
   77         struct agp_amd_gatt    *gatt;
   78 };
   79 
   80 static struct agp_amd_gatt *
   81 agp_amd_alloc_gatt(device_t dev)
   82 {
   83         u_int32_t apsize = AGP_GET_APERTURE(dev);
   84         u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
   85         struct agp_amd_gatt *gatt;
   86         int i, npages, pdir_offset;
   87 
   88         if (bootverbose)
   89                 device_printf(dev,
   90                               "allocating GATT for aperture of size %dM\n",
   91                               apsize / (1024*1024));
   92 
   93         gatt = malloc(sizeof(struct agp_amd_gatt), M_AGP, M_NOWAIT);
   94         if (!gatt)
   95                 return 0;
   96 
   97         /*
   98          * The AMD751 uses a page directory to map a non-contiguous
   99          * gatt so we don't need to use kmem_alloc_contig.
  100          * Allocate individual GATT pages and map them into the page
  101          * directory.
  102          */
  103         gatt->ag_entries = entries;
  104         gatt->ag_virtual = kmem_alloc_attr(entries * sizeof(uint32_t),
  105             M_NOWAIT | M_ZERO, 0, ~0, VM_MEMATTR_WRITE_COMBINING);
  106         if (!gatt->ag_virtual) {
  107                 if (bootverbose)
  108                         device_printf(dev, "allocation failed\n");
  109                 free(gatt, M_AGP);
  110                 return 0;
  111         }
  112 
  113         /*
  114          * Allocate the page directory.
  115          */
  116         gatt->ag_vdir = kmem_alloc_attr(AGP_PAGE_SIZE, M_NOWAIT |
  117             M_ZERO, 0, ~0, VM_MEMATTR_WRITE_COMBINING);
  118         if (!gatt->ag_vdir) {
  119                 if (bootverbose)
  120                         device_printf(dev,
  121                                       "failed to allocate page directory\n");
  122                 kmem_free(gatt->ag_virtual, entries * sizeof(uint32_t));
  123                 free(gatt, M_AGP);
  124                 return 0;
  125         }
  126 
  127         gatt->ag_pdir = vtophys((vm_offset_t) gatt->ag_vdir);
  128         if(bootverbose)
  129                 device_printf(dev, "gatt -> ag_pdir %#lx\n",
  130                     (u_long)gatt->ag_pdir);
  131         /*
  132          * Allocate the gatt pages
  133          */
  134         gatt->ag_entries = entries;
  135         if(bootverbose)
  136                 device_printf(dev, "allocating GATT for %d AGP page entries\n", 
  137                         gatt->ag_entries);
  138 
  139         gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
  140 
  141         /*
  142          * Map the pages of the GATT into the page directory.
  143          *
  144          * The GATT page addresses are mapped into the directory offset by
  145          * an amount dependent on the base address of the aperture. This
  146          * is and offset into the page directory, not an offset added to
  147          * the addresses of the gatt pages.
  148          */
  149 
  150         pdir_offset = pci_read_config(dev, AGP_AMD751_APBASE, 4) >> 22;
  151 
  152         npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1)
  153                   >> AGP_PAGE_SHIFT);
  154 
  155         for (i = 0; i < npages; i++) {
  156                 vm_offset_t va;
  157                 vm_offset_t pa;
  158 
  159                 va = ((vm_offset_t) gatt->ag_virtual) + i * AGP_PAGE_SIZE;
  160                 pa = vtophys(va);
  161                 gatt->ag_vdir[i + pdir_offset] = pa | 1;
  162         }
  163 
  164         return gatt;
  165 }
  166 
  167 static void
  168 agp_amd_free_gatt(struct agp_amd_gatt *gatt)
  169 {
  170         kmem_free(gatt->ag_vdir, AGP_PAGE_SIZE);
  171         kmem_free(gatt->ag_virtual, gatt->ag_entries * sizeof(uint32_t));
  172         free(gatt, M_AGP);
  173 }
  174 
  175 static const char*
  176 agp_amd_match(device_t dev)
  177 {
  178         if (pci_get_class(dev) != PCIC_BRIDGE
  179             || pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
  180                 return NULL;
  181 
  182         if (agp_find_caps(dev) == 0)
  183                 return NULL;
  184 
  185         switch (pci_get_devid(dev)) {
  186         case 0x70061022:
  187                 return ("AMD 751 host to AGP bridge");
  188         case 0x700e1022:
  189                 return ("AMD 761 host to AGP bridge");
  190         case 0x700c1022:
  191                 return ("AMD 762 host to AGP bridge");
  192         }
  193 
  194         return NULL;
  195 }
  196 
  197 static int
  198 agp_amd_probe(device_t dev)
  199 {
  200         const char *desc;
  201 
  202         if (resource_disabled("agp", device_get_unit(dev)))
  203                 return (ENXIO);
  204         desc = agp_amd_match(dev);
  205         if (desc) {
  206                 device_set_desc(dev, desc);
  207                 return BUS_PROBE_DEFAULT;
  208         }
  209 
  210         return ENXIO;
  211 }
  212 
  213 static int
  214 agp_amd_attach(device_t dev)
  215 {
  216         struct agp_amd_softc *sc = device_get_softc(dev);
  217         struct agp_amd_gatt *gatt;
  218         int error, rid;
  219 
  220         error = agp_generic_attach(dev);
  221         if (error)
  222                 return error;
  223 
  224         rid = AGP_AMD751_REGISTERS;
  225         sc->regs = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  226                                           RF_ACTIVE);
  227         if (!sc->regs) {
  228                 agp_generic_detach(dev);
  229                 return ENOMEM;
  230         }
  231 
  232         sc->bst = rman_get_bustag(sc->regs);
  233         sc->bsh = rman_get_bushandle(sc->regs);
  234 
  235         sc->initial_aperture = AGP_GET_APERTURE(dev);
  236 
  237         for (;;) {
  238                 gatt = agp_amd_alloc_gatt(dev);
  239                 if (gatt)
  240                         break;
  241 
  242                 /*
  243                  * Probably contigmalloc failure. Try reducing the
  244                  * aperture so that the gatt size reduces.
  245                  */
  246                 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2))
  247                         return ENOMEM;
  248         }
  249         sc->gatt = gatt;
  250 
  251         /* Install the gatt. */
  252         WRITE4(AGP_AMD751_ATTBASE, gatt->ag_pdir);
  253 
  254         /* Enable synchronisation between host and agp. */
  255         pci_write_config(dev,
  256                          AGP_AMD751_MODECTRL,
  257                          AGP_AMD751_MODECTRL_SYNEN, 1);
  258 
  259         /* Set indexing mode for two-level and enable page dir cache */
  260         pci_write_config(dev,
  261                          AGP_AMD751_MODECTRL2,
  262                          AGP_AMD751_MODECTRL2_GPDCE, 1);
  263 
  264         /* Enable the TLB and flush */
  265         WRITE2(AGP_AMD751_STATUS,
  266                READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE);
  267         AGP_FLUSH_TLB(dev);
  268 
  269         return 0;
  270 }
  271 
  272 static int
  273 agp_amd_detach(device_t dev)
  274 {
  275         struct agp_amd_softc *sc = device_get_softc(dev);
  276 
  277         agp_free_cdev(dev);
  278 
  279         /* Disable the TLB.. */
  280         WRITE2(AGP_AMD751_STATUS,
  281                READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE);
  282 
  283         /* Disable host-agp sync */
  284         pci_write_config(dev, AGP_AMD751_MODECTRL, 0x00, 1);
  285 
  286         /* Clear the GATT base */
  287         WRITE4(AGP_AMD751_ATTBASE, 0);
  288 
  289         /* Put the aperture back the way it started. */
  290         AGP_SET_APERTURE(dev, sc->initial_aperture);
  291 
  292         agp_amd_free_gatt(sc->gatt);
  293         agp_free_res(dev);
  294 
  295         bus_release_resource(dev, SYS_RES_MEMORY,
  296                              AGP_AMD751_REGISTERS, sc->regs);
  297 
  298         return 0;
  299 }
  300 
  301 static u_int32_t
  302 agp_amd_get_aperture(device_t dev)
  303 {
  304         int vas;
  305 
  306         /*
  307          * The aperture size is equal to 32M<<vas.
  308          */
  309         vas = (pci_read_config(dev, AGP_AMD751_APCTRL, 1) & 0x06) >> 1;
  310         return (32*1024*1024) << vas;
  311 }
  312 
  313 static int
  314 agp_amd_set_aperture(device_t dev, u_int32_t aperture)
  315 {
  316         int vas;
  317 
  318         /*
  319          * Check for a power of two and make sure its within the
  320          * programmable range.
  321          */
  322         if (aperture & (aperture - 1)
  323             || aperture < 32*1024*1024
  324             || aperture > 2U*1024*1024*1024)
  325                 return EINVAL;
  326 
  327         vas = ffs(aperture / 32*1024*1024) - 1;
  328 
  329         /* 
  330          * While the size register is bits 1-3 of APCTRL, bit 0 must be
  331          * set for the size value to be 'valid'
  332          */
  333         pci_write_config(dev, AGP_AMD751_APCTRL,
  334                          (((pci_read_config(dev, AGP_AMD751_APCTRL, 1) & ~0x06)
  335                           | ((vas << 1) | 1))), 1);
  336 
  337         return 0;
  338 }
  339 
  340 static int
  341 agp_amd_bind_page(device_t dev, vm_offset_t offset, vm_offset_t physical)
  342 {
  343         struct agp_amd_softc *sc = device_get_softc(dev);
  344 
  345         if (offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  346                 return EINVAL;
  347 
  348         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1;
  349         return 0;
  350 }
  351 
  352 static int
  353 agp_amd_unbind_page(device_t dev, vm_offset_t offset)
  354 {
  355         struct agp_amd_softc *sc = device_get_softc(dev);
  356 
  357         if (offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
  358                 return EINVAL;
  359 
  360         sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
  361         return 0;
  362 }
  363 
  364 static void
  365 agp_amd_flush_tlb(device_t dev)
  366 {
  367         struct agp_amd_softc *sc = device_get_softc(dev);
  368 
  369         /* Set the cache invalidate bit and wait for the chipset to clear */
  370         WRITE4(AGP_AMD751_TLBCTRL, 1);
  371         do {
  372                 DELAY(1);
  373         } while (READ4(AGP_AMD751_TLBCTRL));
  374 }
  375 
  376 static device_method_t agp_amd_methods[] = {
  377         /* Device interface */
  378         DEVMETHOD(device_probe,         agp_amd_probe),
  379         DEVMETHOD(device_attach,        agp_amd_attach),
  380         DEVMETHOD(device_detach,        agp_amd_detach),
  381         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
  382         DEVMETHOD(device_suspend,       bus_generic_suspend),
  383         DEVMETHOD(device_resume,        bus_generic_resume),
  384 
  385         /* AGP interface */
  386         DEVMETHOD(agp_get_aperture,     agp_amd_get_aperture),
  387         DEVMETHOD(agp_set_aperture,     agp_amd_set_aperture),
  388         DEVMETHOD(agp_bind_page,        agp_amd_bind_page),
  389         DEVMETHOD(agp_unbind_page,      agp_amd_unbind_page),
  390         DEVMETHOD(agp_flush_tlb,        agp_amd_flush_tlb),
  391         DEVMETHOD(agp_enable,           agp_generic_enable),
  392         DEVMETHOD(agp_alloc_memory,     agp_generic_alloc_memory),
  393         DEVMETHOD(agp_free_memory,      agp_generic_free_memory),
  394         DEVMETHOD(agp_bind_memory,      agp_generic_bind_memory),
  395         DEVMETHOD(agp_unbind_memory,    agp_generic_unbind_memory),
  396         { 0, 0 }
  397 };
  398 
  399 static driver_t agp_amd_driver = {
  400         "agp",
  401         agp_amd_methods,
  402         sizeof(struct agp_amd_softc),
  403 };
  404 
  405 DRIVER_MODULE(agp_amd, hostb, agp_amd_driver, 0, 0);
  406 MODULE_DEPEND(agp_amd, agp, 1, 1, 1);
  407 MODULE_DEPEND(agp_amd, pci, 1, 1, 1);
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FreeBSD/Linux Kernel Cross Reference sys/dev/agp/agp_amd.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/agp/agp_amd.c
