source: rtems/c/src/lib/libbsp/m68k/sim68000/clock/clockdrv.c @ 11edb53

4.104.114.84.95
Last change on this file since 11edb53 was 11edb53, checked in by Joel Sherrill <joel.sherrill@…>, on Nov 27, 2000 at 5:52:48 PM

2000-11-27 Joel Sherrill <joel@…>

  • README, sim68000.setup, clock/clockdrv.c: Modified to add support for timer as clock tick source. Compiles but untested.
  • Property mode set to 100644
File size: 1.4 KB
Line 
1/*
2 *  Instantiate the clock driver shell.
3 *
4 *  $Id$
5 */
6
7#include <bsp.h>
8
9#define CLOCK_VECTOR 84
10
11#define Clock_driver_support_install_isr( _new, _old )  \
12  do { _old = (rtems_isr_entry) set_vector( _new, CLOCK_VECTOR, 1 ); } while(0)
13
14
15typedef struct {
16  volatile unsigned8  cr;       /*  0 -  0 : Timer Control Register */
17  volatile unsigned8  pad0;     /*  1 -  1 : pad */
18  volatile unsigned8  ivr;      /*  2 -  2 : Timer Interrupt Vector Register */
19  volatile unsigned8  pad1;     /*  3 -  3 : pad */ 
20  volatile unsigned32 cpr;      /*  4 -  7 : Timer Counter Preload Register */
21  volatile unsigned8  pad2[12]; /*  8 - 19 : pad */ 
22  volatile unsigned32 sr;       /* 20 - 23 : Timer Status Register */
23} timer_hw_t;
24
25#define TIMER_BASE (timer_hw_t *)0x72001
26
27/* 8 microseconds per click, 125,000 per second */
28
29/* XXX should check that microseconds_per_tick is >= 8 */
30void Clock_driver_support_initialize_hardware()
31{
32  timer_hw_t *t = TIMER_BASE;
33
34  t->ivr = CLOCK_VECTOR;
35  t->cpr = rtems_configuration_get_microseconds_per_tick() / 8;
36  t->cr  = 0xA0;  /* initialize with timer disabled */
37  t->cr  = 0xA1;  /* enable timer */
38}
39
40void Clock_driver_support_at_tick()
41{
42  timer_hw_t *t = TIMER_BASE;
43 
44  t->sr  = 0xA0;  /* Negate timer interrupt request */
45}
46 
47
48void Clock_driver_support_shutdown_hardware()
49{
50  timer_hw_t *t = TIMER_BASE;
51
52  t->cr  = 0xA0;  /* initialize with timer disabled */
53}
54
55#include "../../../shared/clockdrv_shell.c"
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