agp_sis.c

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    1 /*      $NetBSD: agp_sis.c,v 1.4 2003/01/31 00:07:40 thorpej Exp $      */
    2 
    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  *      $FreeBSD: src/sys/pci/agp_sis.c,v 1.3 2001/07/05 21:28:47 jhb Exp $
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __KERNEL_RCSID(0, "$NetBSD: agp_sis.c,v 1.4 2003/01/31 00:07:40 thorpej Exp $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/malloc.h>
   37 #include <sys/kernel.h>
   38 #include <sys/lock.h>
   39 #include <sys/proc.h>
   40 #include <sys/conf.h>
   41 #include <sys/device.h>
   42 #include <sys/agpio.h>
   43 
   44 #include <uvm/uvm_extern.h>
   45 
   46 #include <dev/pci/pcivar.h>
   47 #include <dev/pci/pcireg.h>
   48 #include <dev/pci/agpvar.h>
   49 #include <dev/pci/agpreg.h>
   50 
   51 #include <machine/bus.h>
   52 
   53 struct agp_sis_softc {
   54         u_int32_t       initial_aperture; /* aperture size at startup */
   55         struct agp_gatt *gatt;
   56 };
   57 
   58 static u_int32_t agp_sis_get_aperture(struct agp_softc *);
   59 static int agp_sis_set_aperture(struct agp_softc *, u_int32_t);
   60 static int agp_sis_bind_page(struct agp_softc *, off_t, bus_addr_t);
   61 static int agp_sis_unbind_page(struct agp_softc *, off_t);
   62 static void agp_sis_flush_tlb(struct agp_softc *);
   63 
   64 struct agp_methods agp_sis_methods = {
   65         agp_sis_get_aperture,
   66         agp_sis_set_aperture,
   67         agp_sis_bind_page,
   68         agp_sis_unbind_page,
   69         agp_sis_flush_tlb,
   70         agp_generic_enable,
   71         agp_generic_alloc_memory,
   72         agp_generic_free_memory,
   73         agp_generic_bind_memory,
   74         agp_generic_unbind_memory,
   75 };
   76 
   77 int
   78 agp_sis_attach(struct device *parent, struct device *self, void *aux)
   79 {
   80         struct agp_softc *sc = (struct agp_softc *)self;
   81         struct pci_attach_args *pa = aux;
   82         struct agp_sis_softc *ssc;
   83         struct agp_gatt *gatt;
   84         pcireg_t reg;
   85 
   86         ssc = malloc(sizeof *ssc, M_AGP, M_NOWAIT);
   87         if (ssc == NULL) {
   88                 aprint_error(": can't allocate chipset-specific softc\n");
   89                 return ENOMEM;
   90         }
   91         sc->as_methods = &agp_sis_methods;
   92         sc->as_chipc = ssc;
   93         pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff,
   94             NULL);
   95 
   96         if (agp_map_aperture(pa, sc) != 0) {
   97                 aprint_error(": can't map aperture\n");
   98                 free(ssc, M_AGP);
   99                 return ENXIO;
  100         }
  101 
  102         ssc->initial_aperture = AGP_GET_APERTURE(sc);
  103 
  104         for (;;) {
  105                 gatt = agp_alloc_gatt(sc);
  106                 if (gatt)
  107                         break;
  108 
  109                 /*
  110                  * Probably contigmalloc failure. Try reducing the
  111                  * aperture so that the gatt size reduces.
  112                  */
  113                 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) {
  114                         agp_generic_detach(sc);
  115                         aprint_error(": failed to set aperture\n");
  116                         return ENOMEM;
  117                 }
  118         }
  119         ssc->gatt = gatt;
  120 
  121         /* Install the gatt. */
  122         pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_ATTBASE,
  123             gatt->ag_physical);
  124         
  125         /* Enable the aperture and auto-tlb-inval */
  126         reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
  127         reg |= (0x05 << 24) | 3;
  128         pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);
  129 
  130         return 0;
  131 }
  132 
  133 #if 0
  134 static int
  135 agp_sis_detach(struct agp_softc *sc)
  136 {
  137         struct agp_sis_softc *ssc = sc->as_chipc;
  138         pcireg_t reg;
  139         int error;
  140 
  141         error = agp_generic_detach(sc);
  142         if (error)
  143                 return error;
  144 
  145         reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);
  146         reg &= ~3;
  147         reg &= 0x00ffffff;
  148         pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);
  149 
  150         /* Put the aperture back the way it started. */
  151         AGP_SET_APERTURE(sc, ssc->initial_aperture);
  152 
  153         agp_free_gatt(sc, ssc->gatt);
  154         return 0;
  155 }
  156 #endif
  157 
  158 static u_int32_t
  159 agp_sis_get_aperture(struct agp_softc *sc)
  160 {
  161         int gws;
  162 
  163         /*
  164          * The aperture size is equal to 4M<<gws.
  165          */
  166         gws = (pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL)&0x70) >> 4;
  167         return (4*1024*1024) << gws;
  168 }
  169 
  170 static int
  171 agp_sis_set_aperture(struct agp_softc *sc, u_int32_t aperture)
  172 {
  173         int gws;
  174         pcireg_t reg;
  175 
  176         /*
  177          * Check for a power of two and make sure its within the
  178          * programmable range.
  179          */
  180         if (aperture & (aperture - 1)
  181             || aperture < 4*1024*1024
  182             || aperture > 256*1024*1024)
  183                 return EINVAL;
  184 
  185         gws = ffs(aperture / 4*1024*1024) - 1;
  186 
  187         reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL);    
  188         reg &= ~0x00000070;
  189         reg |= gws << 4;
  190         pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg);
  191 
  192         return 0;
  193 }
  194 
  195 static int
  196 agp_sis_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical)
  197 {
  198         struct agp_sis_softc *ssc = sc->as_chipc;
  199 
  200         if (offset < 0 || offset >= (ssc->gatt->ag_entries << AGP_PAGE_SHIFT))
  201                 return EINVAL;
  202 
  203         ssc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
  204         return 0;
  205 }
  206 
  207 static int
  208 agp_sis_unbind_page(struct agp_softc *sc, off_t offset)
  209 {
  210         struct agp_sis_softc *ssc = sc->as_chipc;
  211 
  212         if (offset < 0 || offset >= (ssc->gatt->ag_entries << AGP_PAGE_SHIFT))
  213                 return EINVAL;
  214 
  215         ssc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
  216         return 0;
  217 }
  218 
  219 static void
  220 agp_sis_flush_tlb(struct agp_softc *sc)
  221 {
  222         pcireg_t reg;
  223 
  224         reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_TLBFLUSH);
  225         reg &= 0xffffff00;
  226         reg |= 0x02;
  227         pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_TLBFLUSH, reg);
  228 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/pci/agp_sis.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/pci/agp_sis.c