The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*      $NetBSD: obio_space.c,v 1.6 2003/07/15 00:25:05 lukem Exp $     */
    2 
    3 /*-
    4  * SPDX-License-Identifier: BSD-4-Clause
    5  *
    6  * Copyright (c) 2001, 2002, 2003 Wasabi Systems, Inc.
    7  * All rights reserved.
    8  *
    9  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed for the NetBSD Project by
   22  *      Wasabi Systems, Inc.
   23  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
   24  *    or promote products derived from this software without specific prior
   25  *    written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
   28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
   31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   37  * POSSIBILITY OF SUCH DAMAGE.
   38  */
   39 
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD$");
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/bus.h>
   46 #include <sys/kernel.h>
   47 #include <sys/malloc.h>
   48 #include <sys/devmap.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/pmap.h>
   52 #include <vm/vm_kern.h>
   53 #include <vm/vm_extern.h>
   54 
   55 #include <machine/bus.h>
   56 #include <machine/cpufunc.h>
   57 
   58 void
   59 generic_bs_unimplemented(void)
   60 {
   61 
   62         panic("unimplemented bus_space function called");
   63 }
   64 
   65 /* Prototypes for all the bus_space structure functions */
   66 bs_protos(generic);
   67 
   68 int
   69 generic_bs_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags,
   70     bus_space_handle_t *bshp)
   71 {
   72         void *va;
   73 
   74         /*
   75          * We don't even examine the passed-in flags.  For ARM, the CACHEABLE
   76          * flag doesn't make sense (we create VM_MEMATTR_DEVICE mappings), and
   77          * the LINEAR flag is just implied because we use kva_alloc(size).
   78          */
   79         if ((va = pmap_mapdev(bpa, size)) == NULL)
   80                 return (ENOMEM);
   81         *bshp = (bus_space_handle_t)va;
   82         return (0);
   83 }
   84 
   85 int
   86 generic_bs_alloc(bus_space_tag_t t, bus_addr_t rstart, bus_addr_t rend, bus_size_t size,
   87     bus_size_t alignment, bus_size_t boundary, int flags, bus_addr_t *bpap,
   88     bus_space_handle_t *bshp)
   89 {
   90 
   91         panic("generic_bs_alloc(): not implemented");
   92 }
   93 
   94 void
   95 generic_bs_unmap(bus_space_tag_t t, bus_space_handle_t h, bus_size_t size)
   96 {
   97 
   98         pmap_unmapdev((vm_offset_t)h, size);
   99 }
  100 
  101 void
  102 generic_bs_free(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
  103 {
  104 
  105         panic("generic_bs_free(): not implemented");
  106 }
  107 
  108 int
  109 generic_bs_subregion(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset,
  110     bus_size_t size, bus_space_handle_t *nbshp)
  111 {
  112 
  113         *nbshp = bsh + offset;
  114         return (0);
  115 }
  116 
  117 void
  118 generic_bs_barrier(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t offset,
  119     bus_size_t len, int flags)
  120 {
  121 
  122         /*
  123          * dsb() will drain the L1 write buffer and establish a memory access
  124          * barrier point on platforms where that has meaning.  On a write we
  125          * also need to drain the L2 write buffer, because most on-chip memory
  126          * mapped devices are downstream of the L2 cache.  Note that this needs
  127          * to be done even for memory mapped as Device type, because while
  128          * Device memory is not cached, writes to it are still buffered.
  129          */
  130         dsb();
  131         if (flags & BUS_SPACE_BARRIER_WRITE) {
  132                 cpu_l2cache_drain_writebuf();
  133         }
  134 }

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