summaryrefslogtreecommitdiff
path: root/ecos/packages/io/watchdog/current/src/watchdog.cxx
blob: e962616355c8f0942c6da49ae4d41c1157d555a8 (plain)
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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
//==========================================================================
//
//      io/watchdog/watchdog.cxx
//
//      Watchdog common code
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    nickg
// Contributors: nickg
// Date:         1999-02-18
// Purpose:      Watchdog class implementation
//
//####DESCRIPTIONEND####
//
//==========================================================================

#include <pkgconf/system.h>             // system configuration file
#include <pkgconf/watchdog.h>           // configuration for this package

#include <cyg/infra/cyg_trac.h>         // tracing macros
#include <cyg/infra/cyg_ass.h>          // assertion macros

#include <cyg/hal/drv_api.h>            // for locking

#include <cyg/io/watchdog.hxx>          // watchdog API
#include <cyg/io/watchdog.h>            // watchdog c-api

// -------------------------------------------------------------------------
// Statics

// A static pointer to the single system defined watchdog device.
Cyg_Watchdog Cyg_Watchdog::watchdog;

// -------------------------------------------------------------------------
// Constructor


Cyg_Watchdog::Cyg_Watchdog()
{
    CYG_REPORT_FUNCTION();

#ifndef CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT    
    action_list         = 0;
#endif

    // HW driver initialization. This must set the watchdog resolution.
    init_hw();
        
    CYG_REPORT_RETURN();
}

// -------------------------------------------------------------------------
// Return reset resolution

cyg_uint64
Cyg_Watchdog::get_resolution()
{
    return resolution;
}

#ifndef CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT
// -------------------------------------------------------------------------
// Trigger the watchdog as if the timer had expired. This should be called
// from the driver's ISR.

void
Cyg_Watchdog::trigger()
{
    CYG_REPORT_FUNCTION();
    
    cyg_drv_dsr_lock();
    
    Cyg_Watchdog_Action *act = action_list;

    while( 0 != act )
    {
        act->action( act->data );

        act = act->next;
    }

    cyg_drv_dsr_unlock();

    CYG_REPORT_RETURN();
}
    
// -------------------------------------------------------------------------
// Register an action routine that will be called when the timer
// triggers.

void
Cyg_Watchdog::install_action( Cyg_Watchdog_Action *action )
{
    CYG_REPORT_FUNCTION();
    
    cyg_drv_dsr_lock();
    
    action->next = action_list;
    action_list = action;

    cyg_drv_dsr_unlock();

    CYG_REPORT_RETURN();
}

// -------------------------------------------------------------------------
// Deregister a previously registered action routine.

void
Cyg_Watchdog::uninstall_action( Cyg_Watchdog_Action *action )
{
    CYG_REPORT_FUNCTION();
    
    cyg_drv_dsr_lock();

    Cyg_Watchdog_Action **act_ptr = &action_list;    

    while( 0 != *act_ptr )
    {
        Cyg_Watchdog_Action *a = *act_ptr;

        if( a == action )
        {
            *act_ptr = a->next;
            break;
        }
        act_ptr = &a->next;
    }
    
    cyg_drv_dsr_unlock();

    CYG_REPORT_RETURN();
}

#endif // CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT

// -------------------------------------------------------------------------
// Implementation of the C-api

externC void
watchdog_start(void)
{
  Cyg_Watchdog::watchdog.start();
}

externC void
watchdog_reset(void)
{
  Cyg_Watchdog::watchdog.reset();
}

externC cyg_uint64
watchdog_get_resolution(void)
{
  return Cyg_Watchdog::watchdog.get_resolution();
}

// -------------------------------------------------------------------------
// EOF io/watchdog/watchdog.cxx