rv3028.c 5.1 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * RTC driver for the Micro Crystal RV3028
  4. *
  5. * based on linux driver from
  6. * Copyright (C) 2019 Micro Crystal SA
  7. *
  8. * Alexandre Belloni <alexandre.belloni@bootlin.com>
  9. *
  10. */
  11. #include <dm.h>
  12. #include <i2c.h>
  13. #include <rtc.h>
  14. #define RV3028_SEC 0x00
  15. #define RV3028_MIN 0x01
  16. #define RV3028_HOUR 0x02
  17. #define RV3028_WDAY 0x03
  18. #define RV3028_DAY 0x04
  19. #define RV3028_MONTH 0x05
  20. #define RV3028_YEAR 0x06
  21. #define RV3028_ALARM_MIN 0x07
  22. #define RV3028_ALARM_HOUR 0x08
  23. #define RV3028_ALARM_DAY 0x09
  24. #define RV3028_STATUS 0x0E
  25. #define RV3028_CTRL1 0x0F
  26. #define RV3028_CTRL2 0x10
  27. #define RV3028_EVT_CTRL 0x13
  28. #define RV3028_TS_COUNT 0x14
  29. #define RV3028_TS_SEC 0x15
  30. #define RV3028_RAM1 0x1F
  31. #define RV3028_EEPROM_ADDR 0x25
  32. #define RV3028_EEPROM_DATA 0x26
  33. #define RV3028_EEPROM_CMD 0x27
  34. #define RV3028_CLKOUT 0x35
  35. #define RV3028_OFFSET 0x36
  36. #define RV3028_BACKUP 0x37
  37. #define RV3028_STATUS_PORF BIT(0)
  38. #define RV3028_STATUS_EVF BIT(1)
  39. #define RV3028_STATUS_AF BIT(2)
  40. #define RV3028_STATUS_TF BIT(3)
  41. #define RV3028_STATUS_UF BIT(4)
  42. #define RV3028_STATUS_BSF BIT(5)
  43. #define RV3028_STATUS_CLKF BIT(6)
  44. #define RV3028_STATUS_EEBUSY BIT(7)
  45. #define RV3028_CLKOUT_FD_MASK GENMASK(2, 0)
  46. #define RV3028_CLKOUT_PORIE BIT(3)
  47. #define RV3028_CLKOUT_CLKSY BIT(6)
  48. #define RV3028_CLKOUT_CLKOE BIT(7)
  49. #define RV3028_CTRL1_EERD BIT(3)
  50. #define RV3028_CTRL1_WADA BIT(5)
  51. #define RV3028_CTRL2_RESET BIT(0)
  52. #define RV3028_CTRL2_12_24 BIT(1)
  53. #define RV3028_CTRL2_EIE BIT(2)
  54. #define RV3028_CTRL2_AIE BIT(3)
  55. #define RV3028_CTRL2_TIE BIT(4)
  56. #define RV3028_CTRL2_UIE BIT(5)
  57. #define RV3028_CTRL2_TSE BIT(7)
  58. #define RV3028_EVT_CTRL_TSR BIT(2)
  59. #define RV3028_EEPROM_CMD_UPDATE 0x11
  60. #define RV3028_EEPROM_CMD_WRITE 0x21
  61. #define RV3028_EEPROM_CMD_READ 0x22
  62. #define RV3028_EEBUSY_POLL 10000
  63. #define RV3028_EEBUSY_TIMEOUT 100000
  64. #define RV3028_BACKUP_TCE BIT(5)
  65. #define RV3028_BACKUP_TCR_MASK GENMASK(1, 0)
  66. #define OFFSET_STEP_PPT 953674
  67. #define RTC_RV3028_LEN 7
  68. static int rv3028_rtc_get(struct udevice *dev, struct rtc_time *tm)
  69. {
  70. u8 regs[RTC_RV3028_LEN];
  71. u8 status;
  72. int ret;
  73. ret = dm_i2c_read(dev, RV3028_STATUS, &status, 1);
  74. if (ret < 0) {
  75. printf("%s: error reading RTC status: %x\n", __func__, ret);
  76. return -EIO;
  77. }
  78. if (status & RV3028_STATUS_PORF) {
  79. printf("Voltage low, data is invalid.\n");
  80. return -EINVAL;
  81. }
  82. ret = dm_i2c_read(dev, RV3028_SEC, regs, sizeof(regs));
  83. if (ret < 0) {
  84. printf("%s: error reading RTC: %x\n", __func__, ret);
  85. return -EIO;
  86. }
  87. tm->tm_sec = bcd2bin(regs[RV3028_SEC] & 0x7f);
  88. tm->tm_min = bcd2bin(regs[RV3028_MIN] & 0x7f);
  89. tm->tm_hour = bcd2bin(regs[RV3028_HOUR] & 0x3f);
  90. tm->tm_wday = regs[RV3028_WDAY] & 0x7;
  91. tm->tm_mday = bcd2bin(regs[RV3028_DAY] & 0x3f);
  92. tm->tm_mon = bcd2bin(regs[RV3028_MONTH] & 0x1f);
  93. tm->tm_year = bcd2bin(regs[RV3028_YEAR]) + 2000;
  94. tm->tm_yday = 0;
  95. tm->tm_isdst = 0;
  96. debug("%s: %4d-%02d-%02d (wday=%d) %2d:%02d:%02d\n",
  97. __func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
  98. tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
  99. return 0;
  100. }
  101. static int rv3028_rtc_set(struct udevice *dev, const struct rtc_time *tm)
  102. {
  103. u8 regs[RTC_RV3028_LEN];
  104. u8 status;
  105. int ret;
  106. debug("%s: %4d-%02d-%02d (wday=%d( %2d:%02d:%02d\n",
  107. __func__, tm->tm_year, tm->tm_mon, tm->tm_mday,
  108. tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
  109. if (tm->tm_year < 2000) {
  110. printf("%s: year %d (before 2000) not supported\n",
  111. __func__, tm->tm_year);
  112. return -EINVAL;
  113. }
  114. regs[RV3028_SEC] = bin2bcd(tm->tm_sec);
  115. regs[RV3028_MIN] = bin2bcd(tm->tm_min);
  116. regs[RV3028_HOUR] = bin2bcd(tm->tm_hour);
  117. regs[RV3028_WDAY] = tm->tm_wday;
  118. regs[RV3028_DAY] = bin2bcd(tm->tm_mday);
  119. regs[RV3028_MONTH] = bin2bcd(tm->tm_mon);
  120. regs[RV3028_YEAR] = bin2bcd(tm->tm_year - 2000);
  121. ret = dm_i2c_write(dev, RV3028_SEC, regs, sizeof(regs));
  122. if (ret) {
  123. printf("%s: set rtc error: %d\n", __func__, ret);
  124. return ret;
  125. }
  126. ret = dm_i2c_read(dev, RV3028_STATUS, &status, 1);
  127. if (ret < 0) {
  128. printf("%s: error reading RTC status: %x\n", __func__, ret);
  129. return -EIO;
  130. }
  131. status |= RV3028_STATUS_PORF;
  132. return dm_i2c_write(dev, RV3028_STATUS, &status, 1);
  133. }
  134. static int rv3028_rtc_reset(struct udevice *dev)
  135. {
  136. return 0;
  137. }
  138. static int rv3028_rtc_read8(struct udevice *dev, unsigned int reg)
  139. {
  140. u8 data;
  141. int ret;
  142. ret = dm_i2c_read(dev, reg, &data, sizeof(data));
  143. return ret < 0 ? ret : data;
  144. }
  145. static int rv3028_rtc_write8(struct udevice *dev, unsigned int reg, int val)
  146. {
  147. u8 data = val;
  148. return dm_i2c_write(dev, reg, &data, 1);
  149. }
  150. static int rv3028_probe(struct udevice *dev)
  151. {
  152. i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS |
  153. DM_I2C_CHIP_WR_ADDRESS);
  154. return 0;
  155. }
  156. static const struct rtc_ops rv3028_rtc_ops = {
  157. .get = rv3028_rtc_get,
  158. .set = rv3028_rtc_set,
  159. .read8 = rv3028_rtc_read8,
  160. .write8 = rv3028_rtc_write8,
  161. .reset = rv3028_rtc_reset,
  162. };
  163. static const struct udevice_id rv3028_rtc_ids[] = {
  164. { .compatible = "microcrystal,rv3028" },
  165. { }
  166. };
  167. U_BOOT_DRIVER(rtc_rv3028) = {
  168. .name = "rtc-rv3028",
  169. .id = UCLASS_RTC,
  170. .probe = rv3028_probe,
  171. .of_match = rv3028_rtc_ids,
  172. .ops = &rv3028_rtc_ops,
  173. };