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Commit | Line | Data |
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8f3a8428 MY |
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 | ||
45a0194b MY |
14 | #define PCF2127_REG_CTRL1 0x00 |
15 | #define PCF2127_REG_CTRL2 0x01 | |
16 | #define PCF2127_REG_CTRL3 0x02 | |
17 | #define PCF2127_REG_SC 0x03 | |
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 | |
8f3a8428 MY |
24 | |
25 | static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm) | |
26 | { | |
27 | uchar buf[8]; | |
45a0194b | 28 | int i = 0, ret; |
8f3a8428 MY |
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 */ | |
45a0194b | 47 | ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)); |
8f3a8428 | 48 | |
45a0194b | 49 | return ret; |
8f3a8428 MY |
50 | } |
51 | ||
52 | static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm) | |
53 | { | |
45a0194b | 54 | int ret = 0; |
8f3a8428 MY |
55 | uchar buf[10] = { PCF2127_REG_CTRL1 }; |
56 | ||
45a0194b MY |
57 | ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1); |
58 | if (ret < 0) | |
59 | return ret; | |
60 | ret = dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)); | |
61 | if (ret < 0) | |
62 | return ret; | |
8f3a8428 MY |
63 | |
64 | if (buf[PCF2127_REG_CTRL3] & 0x04) | |
65 | puts("### Warning: RTC Low Voltage - date/time not reliable\n"); | |
66 | ||
67 | tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F); | |
68 | tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F); | |
69 | tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F); | |
70 | tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F); | |
71 | tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1; | |
72 | tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900; | |
73 | if (tm->tm_year < 1970) | |
74 | tm->tm_year += 100; /* assume we are in 1970...2069 */ | |
75 | tm->tm_wday = buf[PCF2127_REG_DW] & 0x07; | |
76 | tm->tm_yday = 0; | |
77 | tm->tm_isdst = 0; | |
78 | ||
79 | debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", | |
80 | tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, | |
81 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
82 | ||
45a0194b | 83 | return ret; |
8f3a8428 MY |
84 | } |
85 | ||
86 | static int pcf2127_rtc_reset(struct udevice *dev) | |
87 | { | |
88 | /*Doing nothing here*/ | |
45a0194b | 89 | |
8f3a8428 MY |
90 | return 0; |
91 | } | |
92 | ||
93 | static const struct rtc_ops pcf2127_rtc_ops = { | |
94 | .get = pcf2127_rtc_get, | |
95 | .set = pcf2127_rtc_set, | |
96 | .reset = pcf2127_rtc_reset, | |
97 | }; | |
98 | ||
99 | static const struct udevice_id pcf2127_rtc_ids[] = { | |
100 | { .compatible = "pcf2127-rtc" }, | |
101 | { } | |
102 | }; | |
103 | ||
104 | U_BOOT_DRIVER(rtc_pcf2127) = { | |
105 | .name = "rtc-pcf2127", | |
106 | .id = UCLASS_RTC, | |
107 | .of_match = pcf2127_rtc_ids, | |
108 | .ops = &pcf2127_rtc_ops, | |
109 | }; |