sys/arch/evbppc/virtex/dcr.h

   1 /*      $NetBSD$ */
   2
   3 /*
   4  * Copyright (c) 2006 Jachym Holecek
   5  * All rights reserved.
   6  *
   7  * Written for DFC Design, s.r.o.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  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  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * DCR is an user accesible bus on Xilinx PPC405D5Xn cores and may contain
  34  * arbitrary devices. Because we want to be able to share drivers with
  35  * OPB/PLB, we make it a bus space backend. Each platform ("design", "board")
  36  * has to provide the leaf _read_4/_write_4 routines specific to device
  37  * instances. This is dictated by the fact that DCR can only by accessed
  38  * by m{f,t}dcr instructions for which the address is encoded as immediate
  39  * operand (and hence needs to be a compile-time constant).
  40  *
  41  * The flexibility is well worth the price of one indirection (and a sum
  42  * and a branch), critical paths can still be implemented with m{f,t}dcr().
  43  */
  44
  45 #ifndef _VIRTEX_DCRVAR_H_
  46 #define _VIRTEX_DCRVAR_H_
  47
  48
  49 /* From evbppc/virtex/machdep.c */
  50 int     dcr_subregion(bus_space_tag_t, bus_space_handle_t, bus_size_t,
  51             bus_size_t, bus_space_handle_t *);
  52 int     dcr_map(bus_space_tag_t, bus_addr_t, bus_size_t, int,
  53             bus_space_handle_t *);
  54 void    dcr_unmap(bus_space_tag_t, bus_space_handle_t, bus_size_t);
  55
  56 /* Bus space tag contents, one tag per DCR device. */
  57 #define DCR_BST_BODY(base, read, write) \
  58         .pbs_flags              = _BUS_SPACE_BIG_ENDIAN,        \
  59         .pbs_offset             = 0,                            \
  60         .pbs_base               = (base),                       \
  61         .pbs_limit              = 0x03ff,                       \
  62         .pbs_scalar             = {                             \
  63                 .pbss_write_4   = (write),                      \
  64                 .pbss_read_4    = (read),                       \
  65         },                                                      \
  66         .pbs_map                = dcr_map,                      \
  67         .pbs_unmap              = dcr_unmap,                    \
  68         .pbs_subregion          = dcr_subregion,
  69
  70 /*
  71  * Utility macros for leaf access routines. Note they assume variables
  72  * in local scope, and are furthermore assumed to be used in switch()
  73  * dispatch over destination address.
  74  */
  75 #define WCASE(base, addr) \
  76     case (addr): mtdcr((base) + (addr) / 4, val); break
  77
  78 #define WDEAD(addr) \
  79     default: panic("%s: unexpected offset %#08x", __func__, (addr))
  80
  81 #define RCASE(base, addr) \
  82     case (addr): val = mfdcr((base) + (addr) / 4); break
  83
  84 #define RDEAD(addr) \
  85     default: panic("%s: unexpected offset %#08x", __func__, (addr))
  86
  87 #endif /* _VIRTEX_DCRVAR_H_ */