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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [m68k/] [mvme147/] [clock/] [ckinit.c] - Blame information for rev 173

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/*  Clock_init()
 *
 *  This routine initializes the Tick Timer 2 on the MVME147 board.
 *  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.
 *
 *  MVME147 port for TNI - Telecom Bretagne
 *  by Dominique LE CAMPION (Dominique.LECAMPION@enst-bretagne.fr)
 *  May 1996
 *
 *  $Id: ckinit.c,v 1.2 2001-09-27 12:00:16 chris Exp $
 */
 
#include <stdlib.h>
 
#include <bsp.h>
#include <rtems/libio.h>
 
#define MS_COUNT          65376    /* 1ms */
/* MS_COUNT = 0x10000 - 1e-3/6.25e-6 */
#define CLOCK_INT_LEVEL   6               /* T2's interrupt level */
 
rtems_unsigned32 Clock_isrs;                  /* ISRs until next tick */
volatile rtems_unsigned32 Clock_driver_ticks; /* ticks since initialization */
rtems_isr_entry  Old_ticker;
 
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;
 
 
/*
 *  ISR Handler
 */
 
rtems_isr Clock_isr(rtems_vector_number vector)
{
  Clock_driver_ticks += 1;
  pcc->timer2_int_control |= 0x80; /* Acknowledge interr. */
 
  if (Clock_isrs == 1) {
    rtems_clock_tick();
    Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
  }
  else
    Clock_isrs -= 1;
}
 
void Install_clock(rtems_isr_entry clock_isr )
{
 
  Clock_driver_ticks = 0;
  Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
 
  Old_ticker = (rtems_isr_entry) set_vector( clock_isr, TIMER_2_VECTOR, 1 );
 
  pcc->timer2_int_control = 0x00; /* Disable T2 Interr. */
  pcc->timer2_preload = MS_COUNT;
  /* write preload value */
  pcc->timer2_control = 0x07; /* clear T2 overflow counter, enable counter */
  pcc->timer2_int_control = CLOCK_INT_LEVEL|0x08;
  /* Enable Timer 2 and set its int. level */
 
  atexit( Clock_exit );
}
 
void Clock_exit( void )
{
  pcc->timer2_int_control = 0x00; /* Disable T2 Interr. */
}
 
rtems_device_driver Clock_initialize(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void *pargp
)
{
  Install_clock( Clock_isr );
 
  /*
   * 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(TIMER_2_VECTOR);
    }
    else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
    {
      rtems_interrupt_disable( isrlevel );
       (void) set_vector( args->buffer, TIMER_2_VECTOR, 1 );
      rtems_interrupt_enable( isrlevel );
    }
 
done:
    return RTEMS_SUCCESSFUL;
}
 

Line No.	Rev	Author	Line
1	30	unneback	`/* Clock_init()`
2			`*`
3			`* This routine initializes the Tick Timer 2 on the MVME147 board.`
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			`* MVME147 port for TNI - Telecom Bretagne`
18			`* by Dominique LE CAMPION (Dominique.LECAMPION@enst-bretagne.fr)`
19			`* May 1996`
20			`*`
21			`* $Id: ckinit.c,v 1.2 2001-09-27 12:00:16 chris Exp $`
22			`*/`
23
24			`#include <stdlib.h>`
25
26			`#include <bsp.h>`
27			`#include <rtems/libio.h>`
28
29			`#define MS_COUNT 65376 /* 1ms */`
30			`/* MS_COUNT = 0x10000 - 1e-3/6.25e-6 */`
31			`#define CLOCK_INT_LEVEL 6 /* T2's interrupt level */`
32
33			`rtems_unsigned32 Clock_isrs; /* ISRs until next tick */`
34			`volatile rtems_unsigned32 Clock_driver_ticks; /* ticks since initialization */`
35			`rtems_isr_entry Old_ticker;`
36
37			`void Clock_exit( void );`
38
39			`/*`
40			`* These are set by clock driver during its init`
41			`*/`
42
43			`rtems_device_major_number rtems_clock_major = ~0;`
44			`rtems_device_minor_number rtems_clock_minor;`
45
46
47			`/*`
48			`* ISR Handler`
49			`*/`
50
51			`rtems_isr Clock_isr(rtems_vector_number vector)`
52			`{`
53			`Clock_driver_ticks += 1;`
54			`pcc->timer2_int_control \|= 0x80; /* Acknowledge interr. */`
55
56			`if (Clock_isrs == 1) {`
57			`rtems_clock_tick();`
58			`Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;`
59			`}`
60			`else`
61			`Clock_isrs -= 1;`
62			`}`
63
64			`void Install_clock(rtems_isr_entry clock_isr )`
65			`{`
66
67			`Clock_driver_ticks = 0;`
68			`Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;`
69
70			`Old_ticker = (rtems_isr_entry) set_vector( clock_isr, TIMER_2_VECTOR, 1 );`
71
72			`pcc->timer2_int_control = 0x00; /* Disable T2 Interr. */`
73			`pcc->timer2_preload = MS_COUNT;`
74			`/* write preload value */`
75			`pcc->timer2_control = 0x07; /* clear T2 overflow counter, enable counter */`
76			`pcc->timer2_int_control = CLOCK_INT_LEVEL\|0x08;`
77			`/* Enable Timer 2 and set its int. level */`
78
79			`atexit( Clock_exit );`
80			`}`
81
82			`void Clock_exit( void )`
83			`{`
84			`pcc->timer2_int_control = 0x00; /* Disable T2 Interr. */`
85			`}`
86
87			`rtems_device_driver Clock_initialize(`
88			`rtems_device_major_number major,`
89			`rtems_device_minor_number minor,`
90			`void *pargp`
91			`)`
92			`{`
93			`Install_clock( Clock_isr );`
94
95			`/*`
96			`* make major/minor avail to others such as shared memory driver`
97			`*/`
98
99			`rtems_clock_major = major;`
100			`rtems_clock_minor = minor;`
101
102			`return RTEMS_SUCCESSFUL;`
103			`}`
104
105			`rtems_device_driver Clock_control(`
106			`rtems_device_major_number major,`
107			`rtems_device_minor_number minor,`
108			`void *pargp`
109			`)`
110			`{`
111			`rtems_unsigned32 isrlevel;`
112			`rtems_libio_ioctl_args_t *args = pargp;`
113
114			`if (args == 0)`
115			`goto done;`
116
117			`/*`
118			`* This is hokey, but until we get a defined interface`
119			`* to do this, it will just be this simple...`
120			`*/`
121
122			`if (args->command == rtems_build_name('I', 'S', 'R', ' '))`
123			`{`
124			`Clock_isr(TIMER_2_VECTOR);`
125			`}`
126			`else if (args->command == rtems_build_name('N', 'E', 'W', ' '))`
127			`{`
128			`rtems_interrupt_disable( isrlevel );`
129			`(void) set_vector( args->buffer, TIMER_2_VECTOR, 1 );`
130			`rtems_interrupt_enable( isrlevel );`
131			`}`
132
133			`done:`
134			`return RTEMS_SUCCESSFUL;`
135			`}`
136

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [m68k/] [mvme147/] [clock/] [ckinit.c] - Blame information for rev 173