include/mpc55xx/watchdog.h

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSBSPsPowerPCMPC55XX
0007  *
0008  * @brief Header file for the watchdog timer.
0009  */
0010
0011 /*
0012  * Copyright (c) 2008 embedded brains GmbH & Co. KG
0013  * Redistribution and use in source and binary forms, with or without
0014  * modification, are permitted provided that the following conditions
0015  * are met:
0016  * 1. Redistributions of source code must retain the above copyright
0017  *    notice, this list of conditions and the following disclaimer.
0018  * 2. Redistributions in binary form must reproduce the above copyright
0019  *    notice, this list of conditions and the following disclaimer in the
0020  *    documentation and/or other materials provided with the distribution.
0021  *
0022  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0023  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0024  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0025  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0026  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0027  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0028  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0029  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0030  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0031  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0032  * POSSIBILITY OF SUCH DAMAGE.
0033  */
0034
0035 #ifndef LIBCPU_POWERPC_MPC55XX_WATCHDOG_H
0036 #define LIBCPU_POWERPC_MPC55XX_WATCHDOG_H
0037
0038 #include <stdbool.h>
0039
0040 #include <rtems.h>
0041
0042 #include <libcpu/powerpc-utility.h>
0043
0044 #ifdef __cplusplus
0045 extern "C" {
0046 #endif /* __cplusplus */
0047
0048 static inline void mpc55xx_watchdog_clear()
0049 {
0050     PPC_SET_SPECIAL_PURPOSE_REGISTER( BOOKE_TSR, BOOKE_TSR_WIS);
0051 }
0052
0053 static inline void mpc55xx_watchdog_enable_interrupt( bool enable)
0054 {
0055     if (enable) {
0056         PPC_SET_SPECIAL_PURPOSE_REGISTER_BITS( BOOKE_TCR, BOOKE_TCR_WIE);
0057     } else {
0058         PPC_CLEAR_SPECIAL_PURPOSE_REGISTER_BITS( BOOKE_TCR, BOOKE_TCR_WIE);
0059     }
0060 }
0061
0062 static inline rtems_status_code mpc55xx_watchdog_set_time_base_bit( uint32_t bit)
0063 {
0064     if (bit > 63) {
0065         return RTEMS_INVALID_NUMBER;
0066     }
0067
0068     PPC_SET_SPECIAL_PURPOSE_REGISTER_BITS_MASKED(
0069         BOOKE_TCR,
0070         BOOKE_TCR_WP( bit) | BOOKE_TCR_WPEXT( bit >> 2),
0071         BOOKE_TCR_WP_MASK | BOOKE_TCR_WPEXT_MASK
0072     );
0073
0074     return RTEMS_SUCCESSFUL;
0075 }
0076
0077 #ifdef __cplusplus
0078 }
0079 #endif /* __cplusplus */
0080
0081 #endif /* LIBCPU_POWERPC_MPC55XX_WATCHDOG_H */