source: rtems/c/src/lib/libbsp/powerpc/score603e/tod/tod.c @ 3551166d

4.104.114.9
Last change on this file since 3551166d was 3551166d, checked in by Ralf Corsepius <ralf.corsepius@…>, on Sep 5, 2008 at 11:55:58 AM

Convert to "bool".

  • Property mode set to 100644
File size: 4.0 KB
Line 
1/*
2 * Real Time Clock (Harris ICM7170) for RTEMS
3 *
4 *  This part is found on the second generation of this board.
5 *
6 *  The license and distribution terms for this file may be
7 *  found in the file LICENSE in this distribution or at
8 *  http://www.rtems.com/license/LICENSE.
9 *
10 *  $Id$
11 */
12
13#include <rtems.h>
14#include <tod.h>
15#include <bsp.h>
16
17/*
18 * These values are programed into a register and must not be changed.
19 */
20
21#define ICM1770_CRYSTAL_FREQ_32K      0x00
22#define ICM1770_CRYSTAL_FREQ_1M       0x01
23#define ICM1770_CRYSTAL_FREQ_2M       0x02
24#define ICM1770_CRYSTAL_FREQ_4M       0x03
25
26void ICM7170_GetTOD(
27  volatile unsigned char *imc1770_regs,
28  uint8_t                icm1770_freq,
29  rtems_time_of_day      *rtc_tod
30);
31void ICM7170_SetTOD(
32  volatile unsigned char *imc1770_regs,
33  uint8_t                icm1770_freq,
34  rtems_time_of_day      *rtc_tod
35);
36
37/*
38 *  This code is dependent on the Vista 603e's use of the ICM7170 RTC/NVRAM
39 *  and should remain in this file.
40 */
41
42void setRealTimeToRTEMS()
43{
44  rtems_time_of_day rtc_tod;
45
46  ICM7170_GetTOD( BSP_RTC_ADDRESS, BSP_RTC_FREQUENCY, &rtc_tod );
47  rtems_clock_set( &rtc_tod );
48}
49
50void setRealTimeFromRTEMS()
51{
52  rtems_time_of_day rtems_tod;
53
54  rtems_clock_get( RTEMS_CLOCK_GET_TOD, &rtems_tod );
55  ICM7170_SetTOD( BSP_RTC_ADDRESS, BSP_RTC_FREQUENCY, &rtems_tod );
56}
57
58int checkRealTime()
59{
60  rtems_time_of_day rtems_tod;
61  rtems_time_of_day rtc_tod;
62
63  ICM7170_GetTOD( BSP_RTC_ADDRESS, BSP_RTC_FREQUENCY, &rtc_tod );
64  rtems_clock_get( RTEMS_CLOCK_GET_TOD, &rtems_tod );
65
66  if( rtems_tod.year == rtc_tod.year &&
67      rtems_tod.month == rtc_tod.month &&
68      rtems_tod.day == rtc_tod.day ) {
69     return ((rtems_tod.hour   - rtc_tod.hour) * 3600) +
70            ((rtems_tod.minute - rtc_tod.minute) * 60) +
71             (rtems_tod.second - rtc_tod.second);
72  }
73  return 9999;
74}
75
76/*
77 *  These routines are ICM7170 should be in
78 *  a separate support library.
79 * XXX Make static
80 */
81static int ICM7170_GetField(
82  volatile unsigned char *imc1770_regs,
83  int                     reg
84)
85{
86  unsigned char x;
87
88  x = imc1770_regs[reg*4];
89
90  return x;
91}
92
93static void ICM7170_SetField(
94  volatile unsigned char *imc1770_regs,
95  int                     reg,
96  unsigned char             d
97)
98{
99  imc1770_regs[reg*4] = d;
100}
101
102void ICM7170_GetTOD(
103  volatile unsigned char *imc1770_regs,
104  uint8_t                icm1770_freq,
105  rtems_time_of_day      *rtc_tod
106)
107{
108  int year;
109  int usec;
110  static bool init = true;
111
112  /* Initialize the clock at once prior to reading */
113  if (init ) {
114    ICM7170_SetField( imc1770_regs,  0x11, (0x0c | icm1770_freq) );
115    init = false;
116  }
117
118  /* Latch times */
119  /* rtc_tod->ticks  = */
120
121  usec = ICM7170_GetField( imc1770_regs, 0x00 );
122
123  year = ICM7170_GetField( imc1770_regs, 0x06 );
124  if ( year >= 88 )
125    year += 1900;
126  else
127    year += 2000;
128
129  rtc_tod->year   = year;
130  rtc_tod->month  = ICM7170_GetField( imc1770_regs, 0x04 );
131  rtc_tod->day    = ICM7170_GetField( imc1770_regs, 0x05 );
132  rtc_tod->hour   = ICM7170_GetField( imc1770_regs, 0x01 );
133  rtc_tod->minute = ICM7170_GetField( imc1770_regs, 0x02 );
134  rtc_tod->second = ICM7170_GetField( imc1770_regs, 0x03 );
135  rtc_tod->ticks  = ICM7170_GetField( imc1770_regs, 0x00 );
136}
137
138void ICM7170_SetTOD(
139  volatile unsigned char *imc1770_regs,
140  uint8_t                icm1770_freq,
141  rtems_time_of_day      *rtc_tod
142)
143{
144  int year;
145
146  year = rtc_tod->year;
147  if ( year >= 2088 )        /* plan ahead :) */
148    rtems_fatal_error_occurred( 0xBAD0BAD0 );
149
150  if ( year >= 2000 )
151    year -= 2000;
152  else
153    year -= 1900;
154
155  ICM7170_SetField( imc1770_regs, 0x11, (0x04 |icm1770_freq ) );
156
157  ICM7170_SetField( imc1770_regs, 0x06, year );
158  ICM7170_SetField( imc1770_regs, 0x04, rtc_tod->month );
159  ICM7170_SetField( imc1770_regs, 0x05, rtc_tod->day );
160  ICM7170_SetField( imc1770_regs, 0x01, rtc_tod->hour );
161  ICM7170_SetField( imc1770_regs, 0x02, rtc_tod->minute );
162  ICM7170_SetField( imc1770_regs, 0x03, rtc_tod->second );
163
164  /*
165   * I don't know which day of week is
166   *
167   */
168  ICM7170_SetField( imc1770_regs, 0x07, 1 );
169
170  ICM7170_SetField( imc1770_regs,  0x11, (0x0c | icm1770_freq) );
171}
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