source: rtems/c/src/lib/libbsp/i960/rxgen960/clock/ckinit.c @ c8f3e82

Last change on this file since c8f3e82 was c8f3e82, checked in by Joel Sherrill <joel.sherrill@…>, on Sep 4, 2003 at 6:44:14 PM

2003-09-04 Joel Sherrill <joel@…>

  • clock/ckinit.c, console/console.c, include/bsp.h, startup/bspstart.c, startup/exit.c, startup/setvec.c, timer/timer.c, timer/timerisr.S: URL for license changed.
  • Property mode set to 100644
File size: 4.0 KB
Line 
1/*  Clock_init()
2 *
3 *  This routine initializes the i960RP onboard timer
4 *  The tick frequency is 1 millisecond; assuming 33MHz core
5 *
6 *  Input parameters:  NONE
7 *
8 *  Output parameters:  NONE
9 *
10 *  COPYRIGHT (c) 1989-1997.
11 *  RAMiX Inc 1999
12 *  On-Line Applications Research Corporation (OAR).
13 *
14 *  The license and distribution terms for this file may in
15 *  the file LICENSE in this distribution or at
16 *  http://www.rtems.com/license/LICENSE.
17 *
18 *  $Id$
19 */
20
21#include <stdlib.h>
22
23#include <bsp.h>
24#include <rtems/libio.h>
25
26#define CLOCK_VECTOR 0x92
27
28rtems_unsigned32 Clock_isrs;              /* ISRs until next tick */
29rtems_unsigned32 Reload_Clock_isrs;
30
31i960_isr_entry   Old_ticker;
32volatile rtems_unsigned32 Clock_driver_ticks;
33                                          /* ticks since initialization */
34unsigned int clock_isr_global[16];  /* place to store global regs */
35
36void Clock_exit( void );
37 
38/*
39 * These are set by clock driver during its init
40 */
41 
42rtems_device_major_number rtems_clock_major = ~0;
43rtems_device_minor_number rtems_clock_minor;
44
45/* this is later in the file to avoid it being inlined */
46rtems_isr Clock_isr( rtems_vector_number vector );
47
48void Install_clock(
49  rtems_isr_entry clock_isr
50)
51{
52  volatile unsigned int *tmr0 = (unsigned int *) TMR0_ADDR;
53  volatile unsigned int *trr0 = (unsigned int *) TRR0_ADDR;
54  volatile unsigned int *tcr0 = (unsigned int *) TCR0_ADDR;
55  volatile unsigned int *icon = (unsigned int *) ICON_ADDR;
56  volatile unsigned int *imap2 = (unsigned int *) IMAP2_ADDR;
57  volatile unsigned int *ipnd = (unsigned int *) IPND_ADDR;
58  volatile unsigned int *imsk = (unsigned int *) IMSK_ADDR;
59  void clockHandler();
60
61
62  Clock_driver_ticks = 0;
63  Reload_Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
64  Clock_isrs = Reload_Clock_isrs;
65
66    #define BUS_CLOCK_1 0
67    #define TMR_WRITE_CNTL 8
68    #define TMR_AUTO_RELOAD 4
69    #define TMR_ENABLE 2
70    #define TMR_TERM_CNT_STAT 1
71
72    Old_ticker = set_vector( (((unsigned int) clock_isr) | 0x2), CLOCK_VECTOR, 1 );
73
74    /* initialize the i960RP timer 0 here */
75   
76    /* set the timer countdown (Assume 33MHz operation) */
77    *trr0 = 30 * BSP_Configuration.microseconds_per_tick ;
78    *tcr0 = 30 * BSP_Configuration.microseconds_per_tick ;
79/*
80kkprintf("Load the timers with %x\n", 30 * BSP_Configuration.microseconds_per_tick / Reload_Clock_isrs);
81*/
82 
83    *tmr0 = BUS_CLOCK_1 | TMR_AUTO_RELOAD | TMR_ENABLE;
84/* Unmask the interrupts */
85        *ipnd &= ~(1 << 12);
86        *imsk |= 1 << 12;
87
88}
89
90void Clock_exit()
91{
92  volatile unsigned int *tmr0 = (unsigned int *) TMR0_ADDR;
93
94  /* shut down the timer */
95  *tmr0 = *tmr0 & ~TMR_ENABLE;
96
97  i960_mask_intr( 12 );
98  /* do not restore old vector */
99}
100
101rtems_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  atexit( Clock_exit );
110
111  /*
112   * make major/minor avail to others such as shared memory driver
113   */
114 
115  rtems_clock_major = major;
116  rtems_clock_minor = minor;
117 
118  return RTEMS_SUCCESSFUL;
119}
120 
121rtems_device_driver Clock_control(
122  rtems_device_major_number major,
123  rtems_device_minor_number minor,
124  void *pargp
125)
126{
127    rtems_unsigned32 isrlevel;
128    rtems_libio_ioctl_args_t *args = pargp;
129 
130    if (args == 0)
131        goto done;
132 
133    /*
134     * This is hokey, but until we get a defined interface
135     * to do this, it will just be this simple...
136     */
137 
138    if (args->command == rtems_build_name('I', 'S', 'R', ' '))
139    {
140        Clock_isr(CLOCK_VECTOR);
141    }
142    else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
143    {
144      rtems_interrupt_disable( isrlevel );
145       (void) set_tmr_vector( args->buffer, CLOCK_VECTOR, 0 );
146      rtems_interrupt_enable( isrlevel );
147    }
148 
149done:
150    return RTEMS_SUCCESSFUL;
151}
152
153rtems_isr Clock_isr(
154  rtems_vector_number vector
155)
156{
157  /* enable_tracing(); */
158#ifdef NOTMB
159  if ( Clock_isrs == 1 ) {
160    rtems_clock_tick();
161    Clock_isrs = Reload_Clock_isrs;
162  }
163  else
164  {
165    Clock_isrs -= 1;
166  }
167#else
168*(int *)(0xfed00000) += 1;
169    rtems_clock_tick();
170#endif
171
172  i960_clear_intr( 12 );
173}
174
Note: See TracBrowser for help on using the repository browser.