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/10.2/sys/arm/arm/bus_space_generic.c 278727 2015-02-13 22:32:02Z ian $");
    
    #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>
    #include <machine/cpufunc.h>
    #include <machine/devmap.h>
    
    void
    generic_bs_unimplemented(void)
    {
    
            panic("unimplemented bus_space function called");
    }
    
    /* Prototypes for all the bus_space structure functions */
    bs_protos(generic);
    
    int
    generic_bs_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags,
        bus_space_handle_t *bshp)
    {
            void *va;
    
            /*
             * We don't even examine the passed-in flags.  For ARM, the CACHEABLE
             * flag doesn't make sense (we create PTE_DEVICE mappings), and the
             * LINEAR flag is just implied because we use kva_alloc(size).
             */
            if ((va = pmap_mapdev(bpa, size)) == NULL)
                    return (ENOMEM);
            *bshp = (bus_space_handle_t)va;
            return (0);
    }
    
    int
    generic_bs_alloc(bus_space_tag_t 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(bus_space_tag_t t, bus_space_handle_t h, bus_size_t size)
    {
    
            pmap_unmapdev((vm_offset_t)h, size);
    }
    
   void
   generic_bs_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
   {
   
           panic("generic_bs_free(): not implemented");
   }
   
   int
   generic_bs_subregion(bus_space_tag_t 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(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset,
       bus_size_t len, int flags)
   {
   
           /*
            * dsb() will drain the L1 write buffer and establish a memory access
            * barrier point on platforms where that has meaning.  On a write we
            * also need to drain the L2 write buffer, because most on-chip memory
            * mapped devices are downstream of the L2 cache.  Note that this needs
            * to be done even for memory mapped as Device type, because while
            * Device memory is not cached, writes to it are still buffered.
            */
           dsb();
           if (flags & BUS_SPACE_BARRIER_WRITE) {
                   cpu_l2cache_drain_writebuf();
           }
   }

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