1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/* SPDX-License-Identifier: BSD-2-Clause */
/*
* RTEMS generic mcf548x BSP
*
* The file contains the clock driver code of generic MCF548x BSP. |
*
* Parts of the code has been derived from the "dBUG source code"
* package Freescale is providing for M548X EVBs. The usage of
* the modified or unmodified code and it's integration into the
* generic mcf548x BSP has been done according to the Freescale
* license terms.
*
* The Freescale license terms can be reviewed in the file
*
* LICENSE.Freescale
*
* The generic mcf548x BSP has been developed on the basic
* structures and modules of the av5282 BSP.
*/
/*
* Copyright (c) 2008 embedded brains GmbH & Co. KG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Use first slice timer (SLT0) as the system clock.
*
*/
#include <rtems.h>
#include <bsp.h>
#include <bsp/irq-generic.h>
#include <mcf548x/mcf548x.h>
/*
* Use SLT 0
*/
#define CLOCK_IRQ MCF548X_IRQ_SLT0
/*
* Periodic interval timer interrupt handler
*/
#define Clock_driver_support_at_tick(arg) \
do { \
MCF548X_SLT_SSR0 = MCF548X_SLT_SSR_ST; \
} while (0) \
/*
* Attach clock interrupt handler
*/
#define Clock_driver_support_install_isr( _new ) \
set_vector(_new, CLOCK_IRQ + 64, 1)
/*
* Set up the clock hardware
*
* We need to have 1 interrupt every 10,000 microseconds
* XLB clock 100 MHz / MCF548X_SLT_SLTCNT0 = XLB clock/100
*/
#define Clock_driver_support_initialize_hardware() \
do { \
bsp_interrupt_vector_enable(CLOCK_IRQ); \
MCF548X_SLT_SLTCNT0 = get_CPU_clock_speed() \
/ 1000 \
* rtems_configuration_get_microseconds_per_tick() \
/ 1000; \
MCF548X_SLT_SCR0 |= (MCF548X_SLT_SCR_TEN | MCF548X_SLT_SCR_RUN | MCF548X_SLT_SCR_IEN); \
} while (0)
#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
#include "../../../shared/dev/clock/clockimpl.h"
|
