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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [i960/] [cvme961/] [clock/] [ckinit.c] - Blame information for rev 493

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/*  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) 1989-1999.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id: ckinit.c,v 1.2 2001-09-27 11:59:52 chris Exp $
 */
 
#include <stdlib.h>
 
#include <bsp.h>
#include <rtems/libio.h>
 
#define CLOCK_VECTOR 5
 
rtems_unsigned32 Clock_isrs;              /* ISRs until next tick */
i960_isr_entry   Old_ticker;
volatile rtems_unsigned32 Clock_driver_ticks;
                                          /* ticks since initialization */
 
void Clock_exit( void );
 
/*
 * These are set by clock driver during its init
 */
 
rtems_device_major_number rtems_clock_major = ~0;
rtems_device_minor_number rtems_clock_minor;
 
 
/* this is later in the file to avoid it being inlined */
rtems_isr Clock_isr( rtems_vector_number vector );
 
void Install_clock(
  rtems_isr_entry clock_isr
)
{
  volatile unsigned char *victimer;
 
  Clock_driver_ticks = 0;
  Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
 
  Old_ticker = set_vector( clock_isr, CLOCK_VECTOR, 1 );
  victimer = (volatile unsigned char *) 0xa00000c3;
  *victimer = 0x12;
  *victimer = 0x92;      /* 1000 HZ */
}
 
void Clock_exit()
{
  unsigned char *victimer;
 
  victimer = (unsigned char *) 0xa00000c3;
  *victimer = 0x12;
  i960_mask_intr( 5 );
  /* do not restore old vector */
}
 
rtems_device_driver Clock_initialize(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void *pargp
)
{
  Install_clock( Clock_isr );
 
  atexit( Clock_exit );
 
  /*
   * make major/minor avail to others such as shared memory driver
   */
 
  rtems_clock_major = major;
  rtems_clock_minor = minor;
 
  return RTEMS_SUCCESSFUL;
}
 
rtems_device_driver Clock_control(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void *pargp
)
{
    rtems_unsigned32 isrlevel;
    rtems_libio_ioctl_args_t *args = pargp;
 
    if (args == 0)
        goto done;
 
    /*
     * This is hokey, but until we get a defined interface
     * to do this, it will just be this simple...
     */
 
    if (args->command == rtems_build_name('I', 'S', 'R', ' '))
    {
        Clock_isr(CLOCK_VECTOR);
    }
    else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
    {
      rtems_interrupt_disable( isrlevel );
       (void) set_vector( args->buffer, CLOCK_VECTOR, 1 );
      rtems_interrupt_enable( isrlevel );
    }
 
done:
    return RTEMS_SUCCESSFUL;
}
 
rtems_isr Clock_isr(
  rtems_vector_number vector
)
{
  /* enable_tracing(); */
  Clock_driver_ticks += 1;
  if ( Clock_isrs == 1 ) {
    rtems_clock_tick();
    Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
  }
  else
    Clock_isrs -= 1;
  i960_clear_intr( 5 );
}
 

Line No.	Rev	Author	Line
1	30	unneback	`/* Clock_init()`
2			`*`
3			`* This routine initializes the timer on the VIC chip on the CVME961.`
4			`* The tick frequency is 1 millisecond.`
5			`*`
6			`* Input parameters: NONE`
7			`*`
8			`* Output parameters: NONE`
9			`*`
10			`* COPYRIGHT (c) 1989-1999.`
11			`* On-Line Applications Research Corporation (OAR).`
12			`*`
13			`* The license and distribution terms for this file may be`
14			`* found in the file LICENSE in this distribution or at`
15			`* http://www.OARcorp.com/rtems/license.html.`
16			`*`
17			`* $Id: ckinit.c,v 1.2 2001-09-27 11:59:52 chris Exp $`
18			`*/`
19
20			`#include <stdlib.h>`
21
22			`#include <bsp.h>`
23			`#include <rtems/libio.h>`
24
25			`#define CLOCK_VECTOR 5`
26
27			`rtems_unsigned32 Clock_isrs; /* ISRs until next tick */`
28			`i960_isr_entry Old_ticker;`
29			`volatile rtems_unsigned32 Clock_driver_ticks;`
30			`/* ticks since initialization */`
31
32			`void Clock_exit( void );`
33
34			`/*`
35			`* These are set by clock driver during its init`
36			`*/`
37
38			`rtems_device_major_number rtems_clock_major = ~0;`
39			`rtems_device_minor_number rtems_clock_minor;`
40
41
42			`/* this is later in the file to avoid it being inlined */`
43			`rtems_isr Clock_isr( rtems_vector_number vector );`
44
45			`void Install_clock(`
46			`rtems_isr_entry clock_isr`
47			`)`
48			`{`
49			`volatile unsigned char *victimer;`
50
51			`Clock_driver_ticks = 0;`
52			`Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;`
53
54			`Old_ticker = set_vector( clock_isr, CLOCK_VECTOR, 1 );`
55			`victimer = (volatile unsigned char *) 0xa00000c3;`
56			`*victimer = 0x12;`
57			`victimer = 0x92; / 1000 HZ */`
58			`}`
59
60			`void Clock_exit()`
61			`{`
62			`unsigned char *victimer;`
63
64			`victimer = (unsigned char *) 0xa00000c3;`
65			`*victimer = 0x12;`
66			`i960_mask_intr( 5 );`
67			`/* do not restore old vector */`
68			`}`
69
70			`rtems_device_driver Clock_initialize(`
71			`rtems_device_major_number major,`
72			`rtems_device_minor_number minor,`
73			`void *pargp`
74			`)`
75			`{`
76			`Install_clock( Clock_isr );`
77
78			`atexit( Clock_exit );`
79
80			`/*`
81			`* make major/minor avail to others such as shared memory driver`
82			`*/`
83
84			`rtems_clock_major = major;`
85			`rtems_clock_minor = minor;`
86
87			`return RTEMS_SUCCESSFUL;`
88			`}`
89
90			`rtems_device_driver Clock_control(`
91			`rtems_device_major_number major,`
92			`rtems_device_minor_number minor,`
93			`void *pargp`
94			`)`
95			`{`
96			`rtems_unsigned32 isrlevel;`
97			`rtems_libio_ioctl_args_t *args = pargp;`
98
99			`if (args == 0)`
100			`goto done;`
101
102			`/*`
103			`* This is hokey, but until we get a defined interface`
104			`* to do this, it will just be this simple...`
105			`*/`
106
107			`if (args->command == rtems_build_name('I', 'S', 'R', ' '))`
108			`{`
109			`Clock_isr(CLOCK_VECTOR);`
110			`}`
111			`else if (args->command == rtems_build_name('N', 'E', 'W', ' '))`
112			`{`
113			`rtems_interrupt_disable( isrlevel );`
114			`(void) set_vector( args->buffer, CLOCK_VECTOR, 1 );`
115			`rtems_interrupt_enable( isrlevel );`
116			`}`
117
118			`done:`
119			`return RTEMS_SUCCESSFUL;`
120			`}`
121
122			`rtems_isr Clock_isr(`
123			`rtems_vector_number vector`
124			`)`
125			`{`
126			`/* enable_tracing(); */`
127			`Clock_driver_ticks += 1;`
128			`if ( Clock_isrs == 1 ) {`
129			`rtems_clock_tick();`
130			`Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;`
131			`}`
132			`else`
133			`Clock_isrs -= 1;`
134			`i960_clear_intr( 5 );`
135			`}`
136

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [i960/] [cvme961/] [clock/] [ckinit.c] - Blame information for rev 493