mx27rtc.c 1.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Freescale i.MX27 RTC Driver
  4. *
  5. * Copyright (C) 2012 Philippe Reynes <tremyfr@yahoo.fr>
  6. */
  7. #include <common.h>
  8. #include <rtc.h>
  9. #include <asm/io.h>
  10. #include <asm/arch/imx-regs.h>
  11. #define HOUR_SHIFT 8
  12. #define HOUR_MASK 0x1f
  13. #define MIN_SHIFT 0
  14. #define MIN_MASK 0x3f
  15. int rtc_get(struct rtc_time *time)
  16. {
  17. struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
  18. uint32_t day, hour, min, sec;
  19. day = readl(&rtc_regs->dayr);
  20. hour = readl(&rtc_regs->hourmin);
  21. sec = readl(&rtc_regs->seconds);
  22. min = (hour >> MIN_SHIFT) & MIN_MASK;
  23. hour = (hour >> HOUR_SHIFT) & HOUR_MASK;
  24. sec += min * 60 + hour * 3600 + day * 24 * 3600;
  25. rtc_to_tm(sec, time);
  26. return 0;
  27. }
  28. int rtc_set(struct rtc_time *time)
  29. {
  30. struct rtc_regs *rtc_regs = (struct rtc_regs *)IMX_RTC_BASE;
  31. uint32_t day, hour, min, sec;
  32. sec = rtc_mktime(time);
  33. day = sec / (24 * 3600);
  34. sec = sec % (24 * 3600);
  35. hour = sec / 3600;
  36. sec = sec % 3600;
  37. min = sec / 60;
  38. sec = sec % 60;
  39. hour = (hour & HOUR_MASK) << HOUR_SHIFT;
  40. hour |= (min & MIN_MASK) << MIN_SHIFT;
  41. writel(day, &rtc_regs->dayr);
  42. writel(hour, &rtc_regs->hourmin);
  43. writel(sec, &rtc_regs->seconds);
  44. return 0;
  45. }
  46. void rtc_reset(void)
  47. {
  48. /* nothing to do */
  49. }