| Meng Yi | 188417c | 2016-11-30 15:47:31 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2016 by NXP Semiconductors Inc. |
| 3 | * Date & Time support for PCF2127 RTC |
| 4 | */ |
| 5 | |
| 6 | /* #define DEBUG */ |
| 7 | |
| 8 | #include <common.h> |
| 9 | #include <command.h> |
| 10 | #include <dm.h> |
| 11 | #include <i2c.h> |
| 12 | #include <rtc.h> |
| 13 | |
| 14 | #define PCF2127_REG_CTRL1 (0x00) |
| 15 | #define PCF2127_REG_CTRL2 (0x01) |
| 16 | #define PCF2127_REG_CTRL3 (0x02) |
| 17 | #define PCF2127_REG_SC (0x03) /* datetime */ |
| 18 | #define PCF2127_REG_MN (0x04) |
| 19 | #define PCF2127_REG_HR (0x05) |
| 20 | #define PCF2127_REG_DM (0x06) |
| 21 | #define PCF2127_REG_DW (0x07) |
| 22 | #define PCF2127_REG_MO (0x08) |
| 23 | #define PCF2127_REG_YR (0x09) |
| 24 | |
| 25 | static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm) |
| 26 | { |
| 27 | uchar buf[8]; |
| 28 | int i = 0; |
| 29 | |
| 30 | /* start register address */ |
| 31 | buf[i++] = PCF2127_REG_SC; |
| 32 | |
| 33 | /* hours, minutes and seconds */ |
| 34 | buf[i++] = bin2bcd(tm->tm_sec); |
| 35 | buf[i++] = bin2bcd(tm->tm_min); |
| 36 | buf[i++] = bin2bcd(tm->tm_hour); |
| 37 | buf[i++] = bin2bcd(tm->tm_mday); |
| 38 | buf[i++] = tm->tm_wday & 0x07; |
| 39 | |
| 40 | /* month, 1 - 12 */ |
| 41 | buf[i++] = bin2bcd(tm->tm_mon + 1); |
| 42 | |
| 43 | /* year */ |
| 44 | buf[i++] = bin2bcd(tm->tm_year % 100); |
| 45 | |
| 46 | /* write register's data */ |
| 47 | if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0) |
| 48 | return -1; |
| 49 | |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm) |
| 54 | { |
| 55 | int rel = 0; |
| 56 | uchar buf[10] = { PCF2127_REG_CTRL1 }; |
| 57 | |
| 58 | if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1) < 0) |
| 59 | return -1; |
| 60 | if (dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0) |
| 61 | return -1; |
| 62 | |
| 63 | if (buf[PCF2127_REG_CTRL3] & 0x04) |
| 64 | puts("### Warning: RTC Low Voltage - date/time not reliable\n"); |
| 65 | |
| 66 | tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F); |
| 67 | tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F); |
| 68 | tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F); |
| 69 | tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F); |
| 70 | tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1; |
| 71 | tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900; |
| 72 | if (tm->tm_year < 1970) |
| 73 | tm->tm_year += 100; /* assume we are in 1970...2069 */ |
| 74 | tm->tm_wday = buf[PCF2127_REG_DW] & 0x07; |
| 75 | tm->tm_yday = 0; |
| 76 | tm->tm_isdst = 0; |
| 77 | |
| 78 | debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
| 79 | tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, |
| 80 | tm->tm_hour, tm->tm_min, tm->tm_sec); |
| 81 | |
| 82 | return rel; |
| 83 | } |
| 84 | |
| 85 | static int pcf2127_rtc_reset(struct udevice *dev) |
| 86 | { |
| 87 | /*Doing nothing here*/ |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | static const struct rtc_ops pcf2127_rtc_ops = { |
| 92 | .get = pcf2127_rtc_get, |
| 93 | .set = pcf2127_rtc_set, |
| 94 | .reset = pcf2127_rtc_reset, |
| 95 | }; |
| 96 | |
| 97 | static const struct udevice_id pcf2127_rtc_ids[] = { |
| 98 | { .compatible = "pcf2127-rtc" }, |
| 99 | { } |
| 100 | }; |
| 101 | |
| 102 | U_BOOT_DRIVER(rtc_pcf2127) = { |
| 103 | .name = "rtc-pcf2127", |
| 104 | .id = UCLASS_RTC, |
| 105 | .of_match = pcf2127_rtc_ids, |
| 106 | .ops = &pcf2127_rtc_ops, |
| 107 | }; |