1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2016 by NXP Semiconductors Inc.
3*4882a593Smuzhiyun * Date & Time support for PCF2127 RTC
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun /* #define DEBUG */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <common.h>
9*4882a593Smuzhiyun #include <command.h>
10*4882a593Smuzhiyun #include <dm.h>
11*4882a593Smuzhiyun #include <i2c.h>
12*4882a593Smuzhiyun #include <rtc.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #define PCF2127_REG_CTRL1 0x00
15*4882a593Smuzhiyun #define PCF2127_REG_CTRL2 0x01
16*4882a593Smuzhiyun #define PCF2127_REG_CTRL3 0x02
17*4882a593Smuzhiyun #define PCF2127_REG_SC 0x03
18*4882a593Smuzhiyun #define PCF2127_REG_MN 0x04
19*4882a593Smuzhiyun #define PCF2127_REG_HR 0x05
20*4882a593Smuzhiyun #define PCF2127_REG_DM 0x06
21*4882a593Smuzhiyun #define PCF2127_REG_DW 0x07
22*4882a593Smuzhiyun #define PCF2127_REG_MO 0x08
23*4882a593Smuzhiyun #define PCF2127_REG_YR 0x09
24*4882a593Smuzhiyun
pcf2127_rtc_set(struct udevice * dev,const struct rtc_time * tm)25*4882a593Smuzhiyun static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun uchar buf[8];
28*4882a593Smuzhiyun int i = 0, ret;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun /* start register address */
31*4882a593Smuzhiyun buf[i++] = PCF2127_REG_SC;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun /* hours, minutes and seconds */
34*4882a593Smuzhiyun buf[i++] = bin2bcd(tm->tm_sec);
35*4882a593Smuzhiyun buf[i++] = bin2bcd(tm->tm_min);
36*4882a593Smuzhiyun buf[i++] = bin2bcd(tm->tm_hour);
37*4882a593Smuzhiyun buf[i++] = bin2bcd(tm->tm_mday);
38*4882a593Smuzhiyun buf[i++] = tm->tm_wday & 0x07;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun /* month, 1 - 12 */
41*4882a593Smuzhiyun buf[i++] = bin2bcd(tm->tm_mon + 1);
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun /* year */
44*4882a593Smuzhiyun buf[i++] = bin2bcd(tm->tm_year % 100);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun /* write register's data */
47*4882a593Smuzhiyun ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun return ret;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
pcf2127_rtc_get(struct udevice * dev,struct rtc_time * tm)52*4882a593Smuzhiyun static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun int ret = 0;
55*4882a593Smuzhiyun uchar buf[10] = { PCF2127_REG_CTRL1 };
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1);
58*4882a593Smuzhiyun if (ret < 0)
59*4882a593Smuzhiyun return ret;
60*4882a593Smuzhiyun ret = dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
61*4882a593Smuzhiyun if (ret < 0)
62*4882a593Smuzhiyun return ret;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun if (buf[PCF2127_REG_CTRL3] & 0x04)
65*4882a593Smuzhiyun puts("### Warning: RTC Low Voltage - date/time not reliable\n");
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
68*4882a593Smuzhiyun tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
69*4882a593Smuzhiyun tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
70*4882a593Smuzhiyun tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
71*4882a593Smuzhiyun tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1;
72*4882a593Smuzhiyun tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
73*4882a593Smuzhiyun if (tm->tm_year < 1970)
74*4882a593Smuzhiyun tm->tm_year += 100; /* assume we are in 1970...2069 */
75*4882a593Smuzhiyun tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
76*4882a593Smuzhiyun tm->tm_yday = 0;
77*4882a593Smuzhiyun tm->tm_isdst = 0;
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
80*4882a593Smuzhiyun tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
81*4882a593Smuzhiyun tm->tm_hour, tm->tm_min, tm->tm_sec);
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun return ret;
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
pcf2127_rtc_reset(struct udevice * dev)86*4882a593Smuzhiyun static int pcf2127_rtc_reset(struct udevice *dev)
87*4882a593Smuzhiyun {
88*4882a593Smuzhiyun /*Doing nothing here*/
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun return 0;
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun static const struct rtc_ops pcf2127_rtc_ops = {
94*4882a593Smuzhiyun .get = pcf2127_rtc_get,
95*4882a593Smuzhiyun .set = pcf2127_rtc_set,
96*4882a593Smuzhiyun .reset = pcf2127_rtc_reset,
97*4882a593Smuzhiyun };
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun static const struct udevice_id pcf2127_rtc_ids[] = {
100*4882a593Smuzhiyun { .compatible = "pcf2127-rtc" },
101*4882a593Smuzhiyun { }
102*4882a593Smuzhiyun };
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun U_BOOT_DRIVER(rtc_pcf2127) = {
105*4882a593Smuzhiyun .name = "rtc-pcf2127",
106*4882a593Smuzhiyun .id = UCLASS_RTC,
107*4882a593Smuzhiyun .of_match = pcf2127_rtc_ids,
108*4882a593Smuzhiyun .ops = &pcf2127_rtc_ops,
109*4882a593Smuzhiyun };
110