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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [i386/] [i386ex/] [clock/] [ckinit.c] - Blame information for rev 773

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/*  Clock_initialize
 *
 *  This routine initializes the Timer/Counter on the Intel
 *  386ex evaluation 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 11:59:46 chris Exp $
 */
#define TMR0      0xF040
#define TMR1      0xF041
#define TMR2      0xF042
#define TMRCON    0xF043
#define TMRCFG    0xF834
 
#include <bsp.h>
#include <irq.h>
 
#include <rtems/libio.h>
 
#include <stdlib.h>
 
rtems_unsigned32 Clock_isrs;              /* ISRs until next tick */
static rtems_unsigned32 Clock_initial_isr_value;
 
volatile rtems_unsigned32 Clock_driver_ticks;
 
void Clock_exit( void );
 
/*
 * These are set by clock driver during its init
 */
 
rtems_device_major_number rtems_clock_major = ~0;
rtems_device_major_number rtems_clock_minor = 0;
 
/*
 *  This is the ISR handler.
 */
 
void Clock_isr()
{
  /* enable_tracing(); */
  Clock_driver_ticks += 1;
  if ( Clock_isrs == 1 ) {
    rtems_clock_tick();
    Clock_isrs = Clock_initial_isr_value; /* BSP_Configuration.microseconds_per_tick / 1000;*/
  }
  else
    Clock_isrs -= 1;
}
 
void ClockOff(const rtems_irq_connect_data* unused)
{
  outport_byte  ( TMRCFG , 0x80 ); /* disable the counter timer */
}
 
void ClockOn(const rtems_irq_connect_data* unused)
{
  outport_byte    ( TMRCFG , 0x00 ); /* enable the counter timer */
}
 
int ClockIsOn(const rtems_irq_connect_data* unused)
{
  return ((i8259s_cache & 0x1) == 0);
}
 
static rtems_irq_connect_data clockIrqData = {BSP_PERIODIC_TIMER,
                                              Clock_isr,
                                              ClockOn,
                                              ClockOff,
                                              ClockIsOn};
 
 
rtems_device_driver Clock_initialize(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void *pargp
)
{
  unsigned timer_counter_init_value;
  unsigned char clock_lsb, clock_msb;
 
  Clock_driver_ticks = 0;
 
  Clock_isrs =
    Clock_initial_isr_value =
    BSP_Configuration.microseconds_per_tick / 1000; /* ticks per clock_isr */
 
  /*
   * configure the counter timer ( should be based on microsecs/tick )
   * NB. The divisor(Clock_isrs) resolves the  is the same number that appears in confdefs.h
   * when setting the microseconds_per_tick value.
   */
  ClockOff      ( &clockIrqData );
 
  timer_counter_init_value  =  BSP_Configuration.microseconds_per_tick / Clock_isrs;
  clock_lsb = (unsigned char)timer_counter_init_value;
  clock_msb = timer_counter_init_value >> 8;
 
  outport_byte  ( TMRCON , 0x34 );
  outport_byte  ( TMR0   , clock_lsb );       /* load LSB first */
  outport_byte  ( TMR0   , clock_msb );  /* then MSB       */
 
  if (!BSP_install_rtems_irq_handler (&clockIrqData)) {
    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;
}
 
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;
 
    /*
     * 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();
    }
    else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
    {
      if (!BSP_install_rtems_irq_handler (&clockIrqData)) {
        printk("Error installing clock interrupt handler!\n");
        rtems_fatal_error_occurred(1);
      }
#ifdef DEBUG
      else
        printk("Clock installed AGAIN\n");
#endif
    }
 
done:
    return RTEMS_SUCCESSFUL;
}
 
void Clock_exit()
{
  ClockOff(&clockIrqData);
  BSP_remove_rtems_irq_handler (&clockIrqData);
}

Line No.	Rev	Author	Line
1	30	unneback	`/* Clock_initialize`
2			`*`
3			`* This routine initializes the Timer/Counter on the Intel`
4			`* 386ex evaluation board.`
5			`*`
6			`* The tick frequency is 1 millisecond.`
7			`*`
8			`* Input parameters: NONE`
9			`*`
10			`* Output parameters: NONE`
11			`*`
12			`* COPYRIGHT (c) 1989-1999.`
13			`* On-Line Applications Research Corporation (OAR).`
14			`*`
15			`* The license and distribution terms for this file may be`
16			`* found in the file LICENSE in this distribution or at`
17			`* http://www.OARcorp.com/rtems/license.html.`
18			`*`
19			`* $Id: ckinit.c,v 1.2 2001-09-27 11:59:46 chris Exp $`
20			`*/`
21			`#define TMR0 0xF040`
22			`#define TMR1 0xF041`
23			`#define TMR2 0xF042`
24			`#define TMRCON 0xF043`
25			`#define TMRCFG 0xF834`
26
27			`#include <bsp.h>`
28			`#include <irq.h>`
29
30			`#include <rtems/libio.h>`
31
32			`#include <stdlib.h>`
33
34			`rtems_unsigned32 Clock_isrs; /* ISRs until next tick */`
35			`static rtems_unsigned32 Clock_initial_isr_value;`
36
37			`volatile rtems_unsigned32 Clock_driver_ticks;`
38
39			`void Clock_exit( void );`
40
41			`/*`
42			`* These are set by clock driver during its init`
43			`*/`
44
45			`rtems_device_major_number rtems_clock_major = ~0;`
46			`rtems_device_major_number rtems_clock_minor = 0;`
47
48			`/*`
49			`* This is the ISR handler.`
50			`*/`
51
52			`void Clock_isr()`
53			`{`
54			`/* enable_tracing(); */`
55			`Clock_driver_ticks += 1;`
56			`if ( Clock_isrs == 1 ) {`
57			`rtems_clock_tick();`
58			`Clock_isrs = Clock_initial_isr_value; /* BSP_Configuration.microseconds_per_tick / 1000;*/`
59			`}`
60			`else`
61			`Clock_isrs -= 1;`
62			`}`
63
64			`void ClockOff(const rtems_irq_connect_data* unused)`
65			`{`
66			`outport_byte ( TMRCFG , 0x80 ); /* disable the counter timer */`
67			`}`
68
69			`void ClockOn(const rtems_irq_connect_data* unused)`
70			`{`
71			`outport_byte ( TMRCFG , 0x00 ); /* enable the counter timer */`
72			`}`
73
74			`int ClockIsOn(const rtems_irq_connect_data* unused)`
75			`{`
76			`return ((i8259s_cache & 0x1) == 0);`
77			`}`
78
79			`static rtems_irq_connect_data clockIrqData = {BSP_PERIODIC_TIMER,`
80			`Clock_isr,`
81			`ClockOn,`
82			`ClockOff,`
83			`ClockIsOn};`
84
85
86			`rtems_device_driver Clock_initialize(`
87			`rtems_device_major_number major,`
88			`rtems_device_minor_number minor,`
89			`void *pargp`
90			`)`
91			`{`
92			`unsigned timer_counter_init_value;`
93			`unsigned char clock_lsb, clock_msb;`
94
95			`Clock_driver_ticks = 0;`
96
97			`Clock_isrs =`
98			`Clock_initial_isr_value =`
99			`BSP_Configuration.microseconds_per_tick / 1000; /* ticks per clock_isr */`
100
101			`/*`
102			`* configure the counter timer ( should be based on microsecs/tick )`
103			`* NB. The divisor(Clock_isrs) resolves the is the same number that appears in confdefs.h`
104			`* when setting the microseconds_per_tick value.`
105			`*/`
106			`ClockOff ( &clockIrqData );`
107
108			`timer_counter_init_value = BSP_Configuration.microseconds_per_tick / Clock_isrs;`
109			`clock_lsb = (unsigned char)timer_counter_init_value;`
110			`clock_msb = timer_counter_init_value >> 8;`
111
112			`outport_byte ( TMRCON , 0x34 );`
113			`outport_byte ( TMR0 , clock_lsb ); /* load LSB first */`
114			`outport_byte ( TMR0 , clock_msb ); /* then MSB */`
115
116			`if (!BSP_install_rtems_irq_handler (&clockIrqData)) {`
117			`printk("Unable to initialize system clock\n");`
118			`rtems_fatal_error_occurred(1);`
119			`}`
120
121			`/*`
122			`* make major/minor avail to others such as shared memory driver`
123			`*/`
124
125			`rtems_clock_major = major;`
126			`rtems_clock_minor = minor;`
127
128			`return RTEMS_SUCCESSFUL;`
129			`}`
130
131			`rtems_device_driver Clock_control(`
132			`rtems_device_major_number major,`
133			`rtems_device_minor_number minor,`
134			`void *pargp`
135			`)`
136			`{`
137			`rtems_libio_ioctl_args_t *args = pargp;`
138
139			`if (args == 0)`
140			`goto done;`
141
142			`/*`
143			`* This is hokey, but until we get a defined interface`
144			`* to do this, it will just be this simple...`
145			`*/`
146
147			`if (args->command == rtems_build_name('I', 'S', 'R', ' '))`
148			`{`
149			`Clock_isr();`
150			`}`
151			`else if (args->command == rtems_build_name('N', 'E', 'W', ' '))`
152			`{`
153			`if (!BSP_install_rtems_irq_handler (&clockIrqData)) {`
154			`printk("Error installing clock interrupt handler!\n");`
155			`rtems_fatal_error_occurred(1);`
156			`}`
157			`#ifdef DEBUG`
158			`else`
159			`printk("Clock installed AGAIN\n");`
160			`#endif`
161			`}`
162
163			`done:`
164			`return RTEMS_SUCCESSFUL;`
165			`}`
166
167			`void Clock_exit()`
168			`{`
169			`ClockOff(&clockIrqData);`
170			`BSP_remove_rtems_irq_handler (&clockIrqData);`
171			`}`

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [i386/] [i386ex/] [clock/] [ckinit.c] - Blame information for rev 773