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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [m68k/] [efi68k/] [clock/] [ckinit.c] - Blame information for rev 594

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/*  Clock_init()
 *
 *  This routine initializes the DP8570A periodic interrupt on the
 *  efi68k 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.
 *
 *  $Id: ckinit.c,v 1.2 2001-09-27 12:00:02 chris Exp $
 */
 
#include <stdlib.h>
#include <bsp.h>
#include <rtems/libio.h>
 
#define CLOCK_VECTOR  (TCP_ISR_LEVEL+24)
 
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;
 
 
void per_interrupt(void)
{
  Clock_driver_ticks += 1;
 
  *MSR = PER;
 
  if ( Clock_isrs == 1 ) {
    rtems_clock_tick();
    Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
  }
  else
    Clock_isrs -= 1;
}
 
rtems_isr Clock_isr(
  rtems_vector_number vector
)
{
  unsigned char entry_msr, msr;
 
  entry_msr = *MSR;
  *MSR = 0;
  while ( (msr=*MSR) & INT )
    /* test enabled interrupt bits */
    if (msr & PER)
      per_interrupt();
    else if (msr & T0) {
      *MSR = T0;                /* reset interrupt */
      Timer_interrupts++;       /* inc wrap around counter */
    }
    else
      /* there has been an error if we reach this point */
      /* default action: reset all the interrupts */
      *MSR = ( PER | AL | T0 | T1 );
  *MSR = entry_msr & (RS | PS);
}
 
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, CLOCK_VECTOR, 1 );
 
  *MSR = RS;                    /* enable 1mS interrupts */
  *ICR0 |= OME;
 
  atexit( Clock_exit );
}
 
void Clock_exit( void )
{
  /* shutdown periodic interrupt */
  *MSR = RS;
  *ICR0 &= 0xc0;
  /* 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 );
 
  /*
   * 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;
}

Line No.	Rev	Author	Line
1	30	unneback	`/* Clock_init()`
2			`*`
3			`* This routine initializes the DP8570A periodic interrupt on the`
4			`* efi68k board. 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 12:00:02 chris Exp $`
18			`*/`
19
20			`#include <stdlib.h>`
21			`#include <bsp.h>`
22			`#include <rtems/libio.h>`
23
24			`#define CLOCK_VECTOR (TCP_ISR_LEVEL+24)`
25
26			`rtems_unsigned32 Clock_isrs; /* ISRs until next tick */`
27			`volatile rtems_unsigned32 Clock_driver_ticks;`
28			`/* ticks since initialization */`
29			`rtems_isr_entry Old_ticker;`
30
31			`void Clock_exit( void );`
32
33			`/*`
34			`* These are set by clock driver during its init`
35			`*/`
36
37			`rtems_device_major_number rtems_clock_major = ~0;`
38			`rtems_device_minor_number rtems_clock_minor;`
39
40
41			`void per_interrupt(void)`
42			`{`
43			`Clock_driver_ticks += 1;`
44
45			`*MSR = PER;`
46
47			`if ( Clock_isrs == 1 ) {`
48			`rtems_clock_tick();`
49			`Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;`
50			`}`
51			`else`
52			`Clock_isrs -= 1;`
53			`}`
54
55			`rtems_isr Clock_isr(`
56			`rtems_vector_number vector`
57			`)`
58			`{`
59			`unsigned char entry_msr, msr;`
60
61			`entry_msr = *MSR;`
62			`*MSR = 0;`
63			`while ( (msr=*MSR) & INT )`
64			`/* test enabled interrupt bits */`
65			`if (msr & PER)`
66			`per_interrupt();`
67			`else if (msr & T0) {`
68			`MSR = T0; / reset interrupt */`
69			`Timer_interrupts++; /* inc wrap around counter */`
70			`}`
71			`else`
72			`/* there has been an error if we reach this point */`
73			`/* default action: reset all the interrupts */`
74			`*MSR = ( PER \| AL \| T0 \| T1 );`
75			`*MSR = entry_msr & (RS \| PS);`
76			`}`
77
78			`void Install_clock(`
79			`rtems_isr_entry clock_isr`
80			`)`
81			`{`
82			`Clock_driver_ticks = 0;`
83			`Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;`
84
85			`Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 );`
86
87			`MSR = RS; / enable 1mS interrupts */`
88			`*ICR0 \|= OME;`
89
90			`atexit( Clock_exit );`
91			`}`
92
93			`void Clock_exit( void )`
94			`{`
95			`/* shutdown periodic interrupt */`
96			`*MSR = RS;`
97			`*ICR0 &= 0xc0;`
98			`/* do not restore old vector */`
99			`}`
100
101			`rtems_device_driver Clock_initialize(`
102			`rtems_device_major_number major,`
103			`rtems_device_minor_number minor,`
104			`void *pargp`
105			`)`
106			`{`
107			`Install_clock( Clock_isr );`
108
109			`/*`
110			`* make major/minor avail to others such as shared memory driver`
111			`*/`
112
113			`rtems_clock_major = major;`
114			`rtems_clock_minor = minor;`
115
116			`return RTEMS_SUCCESSFUL;`
117			`}`
118
119			`rtems_device_driver Clock_control(`
120			`rtems_device_major_number major,`
121			`rtems_device_minor_number minor,`
122			`void *pargp`
123			`)`
124			`{`
125			`rtems_unsigned32 isrlevel;`
126			`rtems_libio_ioctl_args_t *args = pargp;`
127
128			`if (args == 0)`
129			`goto done;`
130
131			`/*`
132			`* This is hokey, but until we get a defined interface`
133			`* to do this, it will just be this simple...`
134			`*/`
135
136			`if (args->command == rtems_build_name('I', 'S', 'R', ' '))`
137			`{`
138			`Clock_isr(CLOCK_VECTOR);`
139			`}`
140			`else if (args->command == rtems_build_name('N', 'E', 'W', ' '))`
141			`{`
142			`rtems_interrupt_disable( isrlevel );`
143			`(void) set_vector( args->buffer, CLOCK_VECTOR, 1 );`
144			`rtems_interrupt_enable( isrlevel );`
145			`}`
146
147			`done:`
148			`return RTEMS_SUCCESSFUL;`
149			`}`

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [m68k/] [efi68k/] [clock/] [ckinit.c] - Blame information for rev 594