FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/bus_space_generic.c

     /*      $NetBSD: obio_space.c,v 1.6 2003/07/15 00:25:05 lukem Exp $     */
     
     /*-
      * Copyright (c) 2001, 2002, 2003 Wasabi Systems, Inc.
      * All rights reserved.
      *
      * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      *
      * 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed for the NetBSD Project by
     *      Wasabi Systems, Inc.
     * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     *    or promote products derived from this software without specific prior
     *    written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
     * 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/9.1/sys/arm/arm/bus_space_generic.c 177888 2008-04-03 18:28:34Z raj $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    #include <vm/vm_kern.h>
    #include <vm/vm_extern.h>
    
    #include <machine/bus.h>
    
    /* Prototypes for all the bus_space structure functions */
    bs_protos(generic);
    
    int
    generic_bs_map(void *t, bus_addr_t bpa, bus_size_t size, int flags,
        bus_space_handle_t *bshp)
    {
            const struct pmap_devmap *pd;
            vm_paddr_t startpa, endpa, pa, offset;
            vm_offset_t va;
            pt_entry_t *pte;
    
            if ((pd = pmap_devmap_find_pa(bpa, size)) != NULL) {
                    /* Device was statically mapped. */
                    *bshp = pd->pd_va + (bpa - pd->pd_pa);
                    return (0);
            }
    
            endpa = round_page(bpa + size);
            offset = bpa & PAGE_MASK;
            startpa = trunc_page(bpa);
    
            va = kmem_alloc(kernel_map, endpa - startpa);
            if (va == 0)
                    return (ENOMEM);
    
            *bshp = va + offset;
    
            for (pa = startpa; pa < endpa; pa += PAGE_SIZE, va += PAGE_SIZE) {
                    pmap_kenter(va, pa);
                    pte = vtopte(va);
                    if (!(flags & BUS_SPACE_MAP_CACHEABLE)) {
                            *pte &= ~L2_S_CACHE_MASK;
                            PTE_SYNC(pte);
                    }
            }
    
            return (0);
    }
    
    int
    generic_bs_alloc(void *t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
        bus_size_t alignment, bus_size_t boundary, int flags, bus_addr_t *bpap,
        bus_space_handle_t *bshp)
    {
    
           panic("generic_bs_alloc(): not implemented");
   }
   
   
   void
   generic_bs_unmap(void *t, bus_space_handle_t h, bus_size_t size)
   {
           vm_offset_t va, endva;
   
           if (pmap_devmap_find_va((vm_offset_t)t, size) != NULL) {
                   /* Device was statically mapped; nothing to do. */
                   return;
           }
   
           endva = round_page((vm_offset_t)t + size);
           va = trunc_page((vm_offset_t)t);
   
           while (va < endva) {
                   pmap_kremove(va);
                   va += PAGE_SIZE;
           }
           kmem_free(kernel_map, va, endva - va);
   }
   
   void
   generic_bs_free(void *t, bus_space_handle_t bsh, bus_size_t size)
   {
   
           panic("generic_bs_free(): not implemented");
   }
   
   int
   generic_bs_subregion(void *t, bus_space_handle_t bsh, bus_size_t offset,
       bus_size_t size, bus_space_handle_t *nbshp)
   {
   
           *nbshp = bsh + offset;
           return (0);
   }
   
   void
   generic_bs_barrier(void *t, bus_space_handle_t bsh, bus_size_t offset,
       bus_size_t len, int flags)
   {
   
           /* Nothing to do. */
   }

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