mvrtc.c 4.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (C) 2011
  4. * Jason Cooper <u-boot@lakedaemon.net>
  5. */
  6. /*
  7. * Date & Time support for Marvell Integrated RTC
  8. */
  9. #include <common.h>
  10. #include <command.h>
  11. #include <dm.h>
  12. #include <rtc.h>
  13. #include <asm/io.h>
  14. #include "mvrtc.h"
  15. /* This RTC does not support century, so we assume 20 */
  16. #define CENTURY 20
  17. static int __mv_rtc_get(struct mvrtc_registers *regs, struct rtc_time *t)
  18. {
  19. u32 time;
  20. u32 date;
  21. /* read the time register */
  22. time = readl(&regs->time);
  23. /* read the date register */
  24. date = readl(&regs->date);
  25. /* test for 12 hour clock (can't tell if it's am/pm) */
  26. if (time & MVRTC_HRFMT_MSK) {
  27. printf("Error: RTC in 12 hour mode, can't determine AM/PM.\n");
  28. return -1;
  29. }
  30. /* time */
  31. t->tm_sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
  32. t->tm_min = bcd2bin((time >> MVRTC_MIN_SFT) & MVRTC_MIN_MSK);
  33. t->tm_hour = bcd2bin((time >> MVRTC_HOUR_SFT) & MVRTC_HOUR_MSK);
  34. t->tm_wday = bcd2bin((time >> MVRTC_DAY_SFT) & MVRTC_DAY_MSK);
  35. t->tm_wday--;
  36. /* date */
  37. t->tm_mday = bcd2bin((date >> MVRTC_DATE_SFT) & MVRTC_DATE_MSK);
  38. t->tm_mon = bcd2bin((date >> MVRTC_MON_SFT) & MVRTC_MON_MSK);
  39. t->tm_year = bcd2bin((date >> MVRTC_YEAR_SFT) & MVRTC_YEAR_MSK);
  40. t->tm_year += CENTURY * 100;
  41. /* not supported in this RTC */
  42. t->tm_yday = 0;
  43. t->tm_isdst = 0;
  44. return 0;
  45. }
  46. #ifndef CONFIG_DM_RTC
  47. int rtc_get(struct rtc_time *t)
  48. {
  49. struct mvrtc_registers *regs;
  50. regs = (struct mvrtc_registers *)KW_RTC_BASE;
  51. return __mv_rtc_get(regs, t);
  52. }
  53. #endif /* !CONFIG_DM_RTC */
  54. static int __mv_rtc_set(struct mvrtc_registers *regs, const struct rtc_time *t)
  55. {
  56. u32 time = 0; /* sets hour format bit to zero, 24hr format. */
  57. u32 date = 0;
  58. /* check that this code isn't 80+ years old ;-) */
  59. if ((t->tm_year / 100) != CENTURY)
  60. printf("Warning: Only century %d supported.\n", CENTURY);
  61. /* time */
  62. time |= (bin2bcd(t->tm_sec) & MVRTC_SEC_MSK) << MVRTC_SEC_SFT;
  63. time |= (bin2bcd(t->tm_min) & MVRTC_MIN_MSK) << MVRTC_MIN_SFT;
  64. time |= (bin2bcd(t->tm_hour) & MVRTC_HOUR_MSK) << MVRTC_HOUR_SFT;
  65. time |= (bin2bcd(t->tm_wday + 1) & MVRTC_DAY_MSK) << MVRTC_DAY_SFT;
  66. /* date */
  67. date |= (bin2bcd(t->tm_mday) & MVRTC_DATE_MSK) << MVRTC_DATE_SFT;
  68. date |= (bin2bcd(t->tm_mon) & MVRTC_MON_MSK) << MVRTC_MON_SFT;
  69. date |= (bin2bcd(t->tm_year % 100) & MVRTC_YEAR_MSK) << MVRTC_YEAR_SFT;
  70. /* write the time register */
  71. writel(time, &regs->time);
  72. /* write the date register */
  73. writel(date, &regs->date);
  74. return 0;
  75. }
  76. #ifndef CONFIG_DM_RTC
  77. int rtc_set(struct rtc_time *t)
  78. {
  79. struct mvrtc_registers *regs;
  80. regs = (struct mvrtc_registers *)KW_RTC_BASE;
  81. return __mv_rtc_set(regs, t);
  82. }
  83. #endif /* !CONFIG_DM_RTC */
  84. static void __mv_rtc_reset(struct mvrtc_registers *regs)
  85. {
  86. u32 time;
  87. u32 sec;
  88. /* no init routine for this RTC needed, just check that it's working */
  89. time = readl(&regs->time);
  90. sec = bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK);
  91. udelay(1000000);
  92. time = readl(&regs->time);
  93. if (sec == bcd2bin((time >> MVRTC_SEC_SFT) & MVRTC_SEC_MSK))
  94. printf("Error: RTC did not increment.\n");
  95. }
  96. #ifndef CONFIG_DM_RTC
  97. void rtc_reset(void)
  98. {
  99. struct mvrtc_registers *regs;
  100. regs = (struct mvrtc_registers *)KW_RTC_BASE;
  101. __mv_rtc_reset(regs);
  102. }
  103. #endif /* !CONFIG_DM_RTC */
  104. #ifdef CONFIG_DM_RTC
  105. static int mv_rtc_get(struct udevice *dev, struct rtc_time *tm)
  106. {
  107. struct mvrtc_pdata *pdata = dev_get_platdata(dev);
  108. struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase;
  109. return __mv_rtc_get(regs, tm);
  110. }
  111. static int mv_rtc_set(struct udevice *dev, const struct rtc_time *tm)
  112. {
  113. struct mvrtc_pdata *pdata = dev_get_platdata(dev);
  114. struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase;
  115. return __mv_rtc_set(regs, tm);
  116. }
  117. static int mv_rtc_reset(struct udevice *dev)
  118. {
  119. struct mvrtc_pdata *pdata = dev_get_platdata(dev);
  120. struct mvrtc_registers *regs = (struct mvrtc_registers *)pdata->iobase;
  121. __mv_rtc_reset(regs);
  122. return 0;
  123. }
  124. static const struct rtc_ops mv_rtc_ops = {
  125. .get = mv_rtc_get,
  126. .set = mv_rtc_set,
  127. .reset = mv_rtc_reset,
  128. };
  129. static const struct udevice_id mv_rtc_ids[] = {
  130. { .compatible = "marvell,kirkwood-rtc" },
  131. { .compatible = "marvell,orion-rtc" },
  132. { }
  133. };
  134. static int mv_rtc_ofdata_to_platdata(struct udevice *dev)
  135. {
  136. struct mvrtc_pdata *pdata = dev_get_platdata(dev);
  137. pdata->iobase = devfdt_get_addr(dev);
  138. return 0;
  139. }
  140. U_BOOT_DRIVER(rtc_mv) = {
  141. .name = "rtc-mv",
  142. .id = UCLASS_RTC,
  143. .ofdata_to_platdata = mv_rtc_ofdata_to_platdata,
  144. .of_match = mv_rtc_ids,
  145. .ops = &mv_rtc_ops,
  146. };
  147. #endif /* CONFIG_DM_RTC */