blob: 84e06c38dfb188230d335f556c5385a75037d7ab (
plain) (
blame)
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
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
* Clock Tick Device Driver
*
* This routine utilizes the Decrementer Register common to the PPC family.
*
* The tick frequency is directly programmed to the configured number of
* microseconds per tick.
*
* COPYRIGHT (c) 1989-1997.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may in
* the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* Modified to support the MPC750.
* Modifications Copyright (c) 1999 Eric Valette valette@crf.canon.fr
*
* $Id$
*/
#include <rtems/system.h>
#include <rtems.h>
#include <rtems/libio.h>
#include <stdlib.h> /* for atexit() */
#include <assert.h>
#include <libcpu/c_clock.h>
#include <rtems/bspIo.h> /* for printk() */
extern int BSP_connect_clock_handler (void);
/*
* Clock ticks since initialization
*/
volatile rtems_unsigned32 Clock_driver_ticks;
/*
* This is the value programmed into the count down timer.
*/
rtems_unsigned32 Clock_Decrementer_value;
/*
* These are set by clock driver during its init
*/
rtems_device_major_number rtems_clock_major = ~0;
rtems_device_minor_number rtems_clock_minor;
void clockOff(void* unused)
{
/*
* Nothing to do as we cannot disable all interrupts and
* the decrementer interrupt enable is MSR_EE
*/
}
void clockOn(void* unused)
{
PPC_Set_decrementer( Clock_Decrementer_value );
}
/*
* Clock_isr
*
* This is the clock tick interrupt handler.
*
* Input parameters:
* vector - vector number
*
* Output parameters: NONE
*
* Return values: NONE
*
*/
void clockIsr()
{
/*
* The driver has seen another tick.
*/
PPC_Set_decrementer( Clock_Decrementer_value );
Clock_driver_ticks += 1;
/*
* Real Time Clock counter/timer is set to automatically reload.
*/
rtems_clock_tick();
}
int clockIsOn(void* unused)
{
unsigned32 msr_value;
_CPU_MSR_GET( msr_value );
if (msr_value & MSR_EE) return 1;
return 0;
}
/*
* Clock_exit
*
* This routine allows the clock driver to exit by masking the interrupt and
* disabling the clock's counter.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values: NONE
*
*/
void Clock_exit( void )
{
(void) BSP_disconnect_clock_handler ();
}
/*
* Clock_initialize
*
* This routine initializes the clock driver.
*
* Input parameters:
* major - clock device major number
* minor - clock device minor number
* parg - pointer to optional device driver arguments
*
* Output parameters: NONE
*
* Return values:
* rtems_device_driver status code
*/
rtems_device_driver Clock_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp
)
{
Clock_Decrementer_value = (BSP_bus_frequency/BSP_time_base_divisor)*
(rtems_configuration_get_microseconds_per_tick()/1000);
if (!BSP_connect_clock_handler ()) {
printk("Unable to initialize system clock\n");
rtems_fatal_error_occurred(1);
}
/* make major/minor avail to others such as shared memory driver */
rtems_clock_major = major;
rtems_clock_minor = minor;
return RTEMS_SUCCESSFUL;
} /* Clock_initialize */
/*
* Clock_control
*
* This routine is the clock device driver control entry point.
*
* Input parameters:
* major - clock device major number
* minor - clock device minor number
* parg - pointer to optional device driver arguments
*
* Output parameters: NONE
*
* Return values:
* rtems_device_driver status code
*/
rtems_device_driver Clock_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp
)
{
rtems_libio_ioctl_args_t *args = pargp;
if (args == 0)
goto done;
Clock_Decrementer_value = (BSP_bus_frequency/BSP_time_base_divisor)*
(rtems_configuration_get_microseconds_per_tick()/1000);
if (args->command == rtems_build_name('I', 'S', 'R', ' '))
clockIsr();
else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
{
if (!BSP_connect_clock_handler ()) {
printk("Error installing clock interrupt handler!\n");
rtems_fatal_error_occurred(1);
}
}
done:
return RTEMS_SUCCESSFUL;
}
|
