cpu/nios2/nios2-mpu-reset.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /*
0004  * Copyright (c) 2011 embedded brains GmbH & Co. KG
0005  *
0006  * Redistribution and use in source and binary forms, with or without
0007  * modification, are permitted provided that the following conditions
0008  * are met:
0009  * 1. Redistributions of source code must retain the above copyright
0010  *    notice, this list of conditions and the following disclaimer.
0011  * 2. Redistributions in binary form must reproduce the above copyright
0012  *    notice, this list of conditions and the following disclaimer in the
0013  *    documentation and/or other materials provided with the distribution.
0014  *
0015  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0016  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0017  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0018  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0019  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0020  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0021  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0022  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0023  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0024  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0025  * POSSIBILITY OF SUCH DAMAGE.
0026  */
0027
0028 #ifdef HAVE_CONFIG_H
0029 #include "config.h"
0030 #endif
0031
0032 #include <rtems/score/nios2-utility.h>
0033
0034 void _Nios2_MPU_Reset( const Nios2_MPU_Configuration *config )
0035 {
0036   uint32_t data_mpubase = (1U << config->data_region_size_log2)
0037     | NIOS2_MPUBASE_D;
0038   uint32_t inst_mpubase = 1U << config->instruction_region_size_log2;
0039   uint32_t mpuacc = NIOS2_MPUACC_WR;
0040   int data_count = config->data_region_count;
0041   int inst_count = config->instruction_region_count;
0042   int i = 0;
0043
0044   _Nios2_MPU_Disable();
0045
0046   for ( i = 0; i < data_count; ++i ) {
0047     uint32_t index = ((uint32_t) i) << NIOS2_MPUBASE_INDEX_OFFSET;
0048
0049     _Nios2_Set_ctlreg_mpubase( data_mpubase | index );
0050     _Nios2_Set_ctlreg_mpuacc( mpuacc );
0051   }
0052
0053   for ( i = 0; i < inst_count; ++i ) {
0054     uint32_t index = ((uint32_t) i) << NIOS2_MPUBASE_INDEX_OFFSET;
0055
0056     _Nios2_Set_ctlreg_mpubase( inst_mpubase | index );
0057     _Nios2_Set_ctlreg_mpuacc( mpuacc );
0058   }
0059 }