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