pcf8563.c 2.8 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (C) Copyright 2001
  4. * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  5. */
  6. /*
  7. * Date & Time support for Philips PCF8563 RTC
  8. */
  9. /* #define DEBUG */
  10. #include <common.h>
  11. #include <command.h>
  12. #include <rtc.h>
  13. #include <i2c.h>
  14. static uchar rtc_read (uchar reg);
  15. static void rtc_write (uchar reg, uchar val);
  16. /* ------------------------------------------------------------------------- */
  17. int rtc_get (struct rtc_time *tmp)
  18. {
  19. int rel = 0;
  20. uchar sec, min, hour, mday, wday, mon_cent, year;
  21. sec = rtc_read (0x02);
  22. min = rtc_read (0x03);
  23. hour = rtc_read (0x04);
  24. mday = rtc_read (0x05);
  25. wday = rtc_read (0x06);
  26. mon_cent= rtc_read (0x07);
  27. year = rtc_read (0x08);
  28. debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
  29. "hr: %02x min: %02x sec: %02x\n",
  30. year, mon_cent, mday, wday,
  31. hour, min, sec );
  32. debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
  33. rtc_read (0x0C),
  34. rtc_read (0x0B),
  35. rtc_read (0x0A),
  36. rtc_read (0x09) );
  37. if (sec & 0x80) {
  38. puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
  39. rel = -1;
  40. }
  41. tmp->tm_sec = bcd2bin (sec & 0x7F);
  42. tmp->tm_min = bcd2bin (min & 0x7F);
  43. tmp->tm_hour = bcd2bin (hour & 0x3F);
  44. tmp->tm_mday = bcd2bin (mday & 0x3F);
  45. tmp->tm_mon = bcd2bin (mon_cent & 0x1F);
  46. tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000);
  47. tmp->tm_wday = bcd2bin (wday & 0x07);
  48. tmp->tm_yday = 0;
  49. tmp->tm_isdst= 0;
  50. debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
  51. tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  52. tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  53. return rel;
  54. }
  55. int rtc_set (struct rtc_time *tmp)
  56. {
  57. uchar century;
  58. debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
  59. tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
  60. tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
  61. rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
  62. century = (tmp->tm_year >= 2000) ? 0 : 0x80;
  63. rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
  64. rtc_write (0x06, bin2bcd(tmp->tm_wday));
  65. rtc_write (0x05, bin2bcd(tmp->tm_mday));
  66. rtc_write (0x04, bin2bcd(tmp->tm_hour));
  67. rtc_write (0x03, bin2bcd(tmp->tm_min ));
  68. rtc_write (0x02, bin2bcd(tmp->tm_sec ));
  69. return 0;
  70. }
  71. void rtc_reset (void)
  72. {
  73. /* clear all control & status registers */
  74. rtc_write (0x00, 0x00);
  75. rtc_write (0x01, 0x00);
  76. rtc_write (0x0D, 0x00);
  77. /* clear Voltage Low bit */
  78. rtc_write (0x02, rtc_read (0x02) & 0x7F);
  79. /* reset all alarms */
  80. rtc_write (0x09, 0x00);
  81. rtc_write (0x0A, 0x00);
  82. rtc_write (0x0B, 0x00);
  83. rtc_write (0x0C, 0x00);
  84. }
  85. /* ------------------------------------------------------------------------- */
  86. static uchar rtc_read (uchar reg)
  87. {
  88. return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
  89. }
  90. static void rtc_write (uchar reg, uchar val)
  91. {
  92. i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
  93. }