]> git.sur5r.net Git - u-boot/blob - drivers/rtc/pcf2127.c
Merge branch 'master' of git://git.denx.de/u-boot-mips
[u-boot] / drivers / rtc / pcf2127.c
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
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, ret;
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         ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
48
49         return ret;
50 }
51
52 static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
53 {
54         int ret = 0;
55         uchar buf[10] = { PCF2127_REG_CTRL1 };
56
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;
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
83         return ret;
84 }
85
86 static int pcf2127_rtc_reset(struct udevice *dev)
87 {
88         /*Doing nothing here*/
89
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 };