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

     /*      $NetBSD: agp_amd.c,v 1.9.4.1 2004/11/12 06:17:05 jmc Exp $      */
     
     /*-
      * Copyright (c) 2000 Doug Rabson
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      $FreeBSD: src/sys/pci/agp_amd.c,v 1.6 2001/07/05 21:28:46 jhb Exp $
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: agp_amd.c,v 1.9.4.1 2004/11/12 06:17:05 jmc Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/malloc.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/proc.h>
    #include <sys/conf.h>
    #include <sys/device.h>
    #include <sys/agpio.h>
    
    #include <uvm/uvm_extern.h>
    
    #include <dev/pci/pcivar.h>
    #include <dev/pci/pcireg.h>
    #include <dev/pci/agpvar.h>
    #include <dev/pci/agpreg.h>
    
    #include <dev/pci/pcidevs.h>
    
    #define READ2(off)      bus_space_read_2(asc->iot, asc->ioh, off)
    #define READ4(off)      bus_space_read_4(asc->iot, asc->ioh, off)
    #define WRITE2(off,v)   bus_space_write_2(asc->iot, asc->ioh, off, v)
    #define WRITE4(off,v)   bus_space_write_4(asc->iot, asc->ioh, off, v)
    
    struct agp_amd_gatt {
            bus_dmamap_t    ag_dmamap;
            bus_dma_segment_t ag_dmaseg;
            int             ag_nseg;
            u_int32_t       ag_entries;
            u_int32_t      *ag_vdir;        /* virtual address of page dir */
            bus_addr_t      ag_pdir;        /* bus address of page dir */
            u_int32_t      *ag_virtual;     /* virtual address of gatt */
            bus_addr_t      ag_physical;    /* bus address of gatt */
            size_t          ag_size;
    };
    
    struct agp_amd_softc {
            u_int32_t       initial_aperture; /* aperture size at startup */
            struct agp_amd_gatt *gatt;
            bus_space_handle_t ioh;
            bus_space_tag_t iot;
    };
    
    static u_int32_t agp_amd_get_aperture(struct agp_softc *);
    static int agp_amd_set_aperture(struct agp_softc *, u_int32_t);
    static int agp_amd_bind_page(struct agp_softc *, off_t, bus_addr_t);
    static int agp_amd_unbind_page(struct agp_softc *, off_t);
    static void agp_amd_flush_tlb(struct agp_softc *);
    
    
    struct agp_methods agp_amd_methods = {
            agp_amd_get_aperture,
            agp_amd_set_aperture,
            agp_amd_bind_page,
            agp_amd_unbind_page,
            agp_amd_flush_tlb,
            agp_generic_enable,
            agp_generic_alloc_memory,
            agp_generic_free_memory,
            agp_generic_bind_memory,
            agp_generic_unbind_memory,
    };
    
    
    static struct agp_amd_gatt *
    agp_amd_alloc_gatt(struct agp_softc *sc)
   {
           u_int32_t apsize = AGP_GET_APERTURE(sc);
           u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
           struct agp_amd_gatt *gatt;
           int i, npages;
           caddr_t vdir;
   
           gatt = malloc(sizeof(struct agp_amd_gatt), M_AGP, M_NOWAIT);
           if (!gatt)
                   return 0;
   
           if (agp_alloc_dmamem(sc->as_dmat,
               AGP_PAGE_SIZE + entries * sizeof(u_int32_t), 0,
               &gatt->ag_dmamap, &vdir, &gatt->ag_pdir,
               &gatt->ag_dmaseg, 1, &gatt->ag_nseg) != 0) {
                   printf("failed to allocate GATT\n");
                   free(gatt, M_AGP);
                   return NULL;
           }
   
           gatt->ag_vdir = (u_int32_t *)vdir;
           gatt->ag_entries = entries;
           gatt->ag_virtual = (u_int32_t *)(vdir + AGP_PAGE_SIZE);
           gatt->ag_physical = gatt->ag_pdir + AGP_PAGE_SIZE;
           gatt->ag_size = AGP_PAGE_SIZE + entries * sizeof(u_int32_t);
   
           memset(gatt->ag_vdir, 0, AGP_PAGE_SIZE);
           memset(gatt->ag_virtual, 0, entries * sizeof(u_int32_t));
   
           /*
            * Map the pages of the GATT into the page directory.
            */
           npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1)
                     >> AGP_PAGE_SHIFT);
   
           for (i = 0; i < npages; i++)
                   gatt->ag_vdir[i] = (gatt->ag_physical + i * AGP_PAGE_SIZE) | 1;
   
           /*
            * Make sure the chipset can see everything.
            */
           agp_flush_cache();
   
           return gatt;
   }
   
   #if 0
   static void
   agp_amd_free_gatt(struct agp_softc *sc, struct agp_amd_gatt *gatt)
   {
           agp_free_dmamem(sc->as_dmat, gatt->ag_size,
               gatt->ag_dmamap, (caddr_t)gatt->ag_virtual, &gatt->ag_dmaseg,
               gatt->ag_nseg);
           free(gatt, M_AGP);
   }
   #endif
   
   int
   agp_amd_match(const struct pci_attach_args *pa)
   {
   
           switch (PCI_PRODUCT(pa->pa_id)) {
           case PCI_PRODUCT_AMD_SC751_SC:
           case PCI_PRODUCT_AMD_SC761_SC:
           case PCI_PRODUCT_AMD_SC762_NB:
                   return 1;
           }
   
           return 0;
   }
   
   int
   agp_amd_attach(struct device *parent, struct device *self, void *aux)
   {
           struct agp_softc *sc = (void *)self;
           struct agp_amd_softc *asc;
           struct pci_attach_args *pa = aux;
           struct agp_amd_gatt *gatt;
           pcireg_t reg;
           int error;
   
           asc = malloc(sizeof *asc, M_AGP, M_NOWAIT|M_ZERO);
           if (asc == NULL) {
                   aprint_error(": can't allocate softc\n");
                   /* agp_generic_detach(sc) */
                   return ENOMEM;
           }
   
           error = pci_mapreg_map(pa, AGP_AMD751_REGISTERS, PCI_MAPREG_TYPE_MEM, 0,
               &asc->iot, &asc->ioh, NULL, NULL);
           if (error != 0) {
                   aprint_error(": can't map AGP registers\n");
                   agp_generic_detach(sc);
                   return error;
           }
   
           if (agp_map_aperture(pa, sc) != 0) {
                   aprint_error(": can't map aperture\n");
                   agp_generic_detach(sc);
                   free(asc, M_AGP);
                   return ENXIO;
           }
           pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff,
               NULL);
           sc->as_methods = &agp_amd_methods;
           sc->as_chipc = asc;
           asc->initial_aperture = AGP_GET_APERTURE(sc);
   
           for (;;) {
                   gatt = agp_amd_alloc_gatt(sc);
                   if (gatt)
                           break;
   
                   /*
                    * Probably contigmalloc failure. Try reducing the
                    * aperture so that the gatt size reduces.
                    */
                   if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) {
                           aprint_error(": can't set aperture\n");
                           return ENOMEM;
                   }
           }
           asc->gatt = gatt;
   
           /* Install the gatt. */
           WRITE4(AGP_AMD751_ATTBASE, gatt->ag_physical);
           
           /* Enable synchronisation between host and agp. */
           reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_AMD751_MODECTRL);
           reg &= ~0x00ff00ff;
           reg |= (AGP_AMD751_MODECTRL_SYNEN) | (AGP_AMD751_MODECTRL2_GPDCE << 16);
           pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_AMD751_MODECTRL, reg);
           /* Enable the TLB and flush */
           WRITE2(AGP_AMD751_STATUS,
                  READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE);
           AGP_FLUSH_TLB(sc);
   
           return 0;
   }
   
   #if 0
   static int
   agp_amd_detach(struct agp_softc *sc)
   {
           pcireg_t reg;
           struct agp_amd_softc *asc = sc->as_chipc;
   
           /* Disable the TLB.. */
           WRITE2(AGP_AMD751_STATUS,
                  READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE);
           
           /* Disable host-agp sync */
           reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_MODECTRL);
           reg &= 0xffffff00;
           pci_conf_write(sc->as_pc, sc->as_tag, AGP_AMD751_MODECTRL, reg);
           
           /* Clear the GATT base */
           WRITE4(AGP_AMD751_ATTBASE, 0);
   
           /* Put the aperture back the way it started. */
           AGP_SET_APERTURE(sc, asc->initial_aperture);
   
           agp_amd_free_gatt(sc, asc->gatt);
   
           /* XXXfvdl no pci_mapreg_unmap */
   
           return 0;
   }
   #endif
   
   static u_int32_t
   agp_amd_get_aperture(struct agp_softc *sc)
   {
           int vas;
   
           vas = (pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL) & 0x06);
           vas >>= 1;
           /*
            * The aperture size is equal to 32M<<vas.
            */
           return (32*1024*1024) << vas;
   }
   
   static int
   agp_amd_set_aperture(struct agp_softc *sc, u_int32_t aperture)
   {
           int vas;
           pcireg_t reg;
   
           /*
            * Check for a power of two and make sure its within the
            * programmable range.
            */
           if (aperture & (aperture - 1)
               || aperture < 32*1024*1024
               || aperture > 2U*1024*1024*1024)
                   return EINVAL;
   
           vas = ffs(aperture / 32*1024*1024) - 1;
   
           reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL);
           reg = (reg & ~0x06) | (vas << 1);
           pci_conf_write(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL, reg);
           
           return 0;
   }
   
   static int
   agp_amd_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical)
   {
           struct agp_amd_softc *asc = sc->as_chipc;
   
           if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
                   return EINVAL;
   
           asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1;
           return 0;
   }
   
   static int
   agp_amd_unbind_page(struct agp_softc *sc, off_t offset)
   {
           struct agp_amd_softc *asc = sc->as_chipc;
   
           if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
                   return EINVAL;
   
           asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
           return 0;
   }
   
   static void
   agp_amd_flush_tlb(struct agp_softc *sc)
   {
           struct agp_amd_softc *asc = sc->as_chipc;
   
           /* Set the cache invalidate bit and wait for the chipset to clear */
           WRITE4(AGP_AMD751_TLBCTRL, 1);
           do {
                   DELAY(1);
           } while (READ4(AGP_AMD751_TLBCTRL));
   }

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