source: rtems/cpukit/sapi/src/tcsimpleinstall.c

Last change on this file was bcef89f2, checked in by Sebastian Huber <sebastian.huber@…>, on 05/19/23 at 06:18:25

Update company name

The embedded brains GmbH & Co. KG is the legal successor of embedded
brains GmbH.

  • Property mode set to 100644
File size: 2.5 KB
Line 
1/* SPDX-License-Identifier: BSD-2-Clause */
2
3/**
4 * @file
5 *
6 * @ingroup RTEMSAPIClassicTimecounter
7 *
8 * @brief This source file contains the implementation of
9 *   rtems_timecounter_simple_install().
10 */
11
12/*
13 * Copyright (c) 2015 embedded brains GmbH & Co. KG
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 *    notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 *    notice, this list of conditions and the following disclaimer in the
22 *    documentation and/or other materials provided with the distribution.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#ifdef HAVE_CONFIG_H
38#include "config.h"
39#endif
40
41#include <rtems/timecounter.h>
42
43void rtems_timecounter_simple_install(
44  rtems_timecounter_simple *tc,
45  uint32_t                  frequency_in_hz,
46  uint32_t                  counter_ticks_per_clock_tick,
47  timecounter_get_t        *get_timecount
48)
49{
50  uint32_t power_of_two = 1;
51  uint32_t mask;
52  uint64_t scaler;
53  int i;
54
55  for ( i = 0; i < 32; ++i ) {
56    if ( power_of_two >= counter_ticks_per_clock_tick ) {
57      break;
58    }
59
60    power_of_two *= 2;
61  }
62
63  mask = ( 2 * power_of_two ) - 1;
64  scaler = ( (uint64_t) power_of_two << 32 ) / counter_ticks_per_clock_tick;
65
66  tc->scaler = scaler;
67  tc->real_interval = counter_ticks_per_clock_tick;
68  tc->binary_interval = ( mask + 1 ) / 2;
69  tc->tc.tc_get_timecount = get_timecount;
70  tc->tc.tc_counter_mask = mask;
71  tc->tc.tc_frequency = (uint32_t) ( ( frequency_in_hz * scaler ) >> 32 );
72  tc->tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
73  _Timecounter_Install( &tc->tc );
74}
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