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
|
/* Clock_init()
*
* This routine initializes the timer on the VIC chip on the CVME961.
* The tick frequency is 1 millisecond.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
* On-Line Applications Research Corporation (OAR).
* All rights assigned to U.S. Government, 1994.
*
* This material may be reproduced by or for the U.S. Government pursuant
* to the copyright license under the clause at DFARS 252.227-7013. This
* notice must appear in all copies of this file and its derivatives.
*
* $Id$
*/
#include <stdlib.h>
#include <rtems.h>
#include <bsp.h>
#include <clockdrv.h>
rtems_unsigned32 Clock_isrs; /* ISRs until next tick */
i960_isr Old_ticker;
volatile rtems_unsigned32 Clock_driver_ticks;
/* ticks since initialization */
rtems_device_driver Clock_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *pargp,
rtems_id id,
rtems_unsigned32 *rval )
{
Install_clock( Clock_isr );
atexit( Clock_exit );
}
void ReInstall_clock(
rtems_isr_entry clock_isr
)
{
(void) set_vector( clock_isr, 5, 1 );
}
void Install_clock(
rtems_isr_entry clock_isr
)
{
volatile unsigned char *victimer;
Clock_driver_ticks = 0;
Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
if ( BSP_Configuration.ticks_per_timeslice ) {
Old_ticker = set_vector( clock_isr, 5, 1 );
victimer = (volatile unsigned char *) 0xa00000c3;
*victimer = 0x12;
*victimer = 0x92; /* 1000 HZ */
}
}
void Clock_exit()
{
unsigned char *victimer;
if ( BSP_Configuration.ticks_per_timeslice ) {
victimer = (unsigned char *) 0xa00000c3;
*victimer = 0x12;
i960_mask_intr( 5 );
/* do not restore old vector */
}
}
|
