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      1 /*  This file is part of the program psim.
      2 
      3     Copyright (C) 1994-1996, Andrew Cagney <cagney (at) highland.com.au>
      4 
      5     This program is free software; you can redistribute it and/or modify
      6     it under the terms of the GNU General Public License as published by
      7     the Free Software Foundation; either version 3 of the License, or
      8     (at your option) any later version.
      9 
     10     This program is distributed in the hope that it will be useful,
     11     but WITHOUT ANY WARRANTY; without even the implied warranty of
     12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13     GNU General Public License for more details.
     14 
     15     You should have received a copy of the GNU General Public License
     16     along with this program; if not, see <http://www.gnu.org/licenses/>.
     17 
     18     */
     19 
     20 
     21 #ifndef _HW_IOBUS_C_
     22 #define _HW_IOBUS_C_
     23 
     24 #ifndef STATIC_INLINE_HW_IOBUS
     25 #define STATIC_INLINE_HW_IOBUS STATIC_INLINE
     26 #endif
     27 
     28 #include "device_table.h"
     29 
     30 
     31 /* DEVICE
     32 
     33    iobus - simple bus for attaching devices
     34 
     35    DESCRIPTION
     36 
     37    IOBUS provides a simple `local' bus for attaching (hanging)
     38    programmed IO devices from.  All child devices are directly mapped
     39    into this devices parent address space (after checking that the
     40    attach address lies within the <<iobus>> address range.  address).
     41 
     42    PROPERTIES
     43 
     44    None.
     45 
     46    */
     47 
     48 static void
     49 hw_iobus_attach_address_callback(device *me,
     50 				 attach_type type,
     51 				 int space,
     52 				 unsigned_word addr,
     53 				 unsigned nr_bytes,
     54 				 access_type access,
     55 				 device *client) /*callback/default*/
     56 {
     57   int attach_space;
     58   unsigned_word attach_address;
     59   /* sanity check */
     60   if (space != 0)
     61     device_error(me, "invalid space (%d) specified by %s",
     62 		 space, device_path(client));
     63   /* get the bus address */
     64   device_address_to_attach_address(device_parent(me),
     65 				   device_unit_address(me),
     66 				   &attach_space,
     67 				   &attach_address,
     68 				   me);
     69   if (addr < attach_address)
     70     device_error(me, "Invalid attach address 0x%lx", (unsigned long)addr);
     71   device_attach_address(device_parent(me),
     72 			type,
     73 			attach_space,
     74 			addr,
     75 			nr_bytes,
     76 			access,
     77 			client);
     78 }
     79 
     80 
     81 static device_callbacks const hw_iobus_callbacks = {
     82   { NULL, },
     83   { hw_iobus_attach_address_callback, },
     84   { NULL, }, /* IO */
     85   { NULL, }, /* DMA */
     86   { NULL, }, /* interrupt */
     87   { generic_device_unit_decode,
     88     generic_device_unit_encode,
     89     generic_device_address_to_attach_address,
     90     generic_device_size_to_attach_size }
     91 };
     92 
     93 
     94 const device_descriptor hw_iobus_device_descriptor[] = {
     95   { "iobus", NULL, &hw_iobus_callbacks },
     96   { NULL, },
     97 };
     98 
     99 #endif /* _HW_IOBUS_ */
    100