1 /*
2 * Copyright (C) 2016 by NXP Semiconductors Inc.
3 * Date & Time support for PCF2127 RTC
4 */
5
6 /* #define DEBUG */
7
8 #include <command.h>
9 #include <dm.h>
10 #include <i2c.h>
11 #include <log.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
pcf2127_rtc_read(struct udevice * dev,uint offset,u8 * buffer,uint len)25 static int pcf2127_rtc_read(struct udevice *dev, uint offset, u8 *buffer, uint len)
26 {
27 struct dm_i2c_chip *chip = dev_get_parent_plat(dev);
28 struct i2c_msg msg;
29 int ret;
30
31 /* Set the address of the start register to be read */
32 ret = dm_i2c_write(dev, offset, NULL, 0);
33 if (ret < 0)
34 return ret;
35
36 /* Read register's data */
37 msg.addr = chip->chip_addr;
38 msg.flags |= I2C_M_RD;
39 msg.len = len;
40 msg.buf = buffer;
41
42 return dm_i2c_xfer(dev, &msg, 1);
43 }
44
pcf2127_rtc_write(struct udevice * dev,uint offset,const u8 * buffer,uint len)45 static int pcf2127_rtc_write(struct udevice *dev, uint offset,
46 const u8 *buffer, uint len)
47 {
48 return dm_i2c_write(dev, offset, buffer, len);
49 }
50
pcf2127_rtc_set(struct udevice * dev,const struct rtc_time * tm)51 static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm)
52 {
53 uchar buf[7] = {0};
54 int i = 0, ret;
55
56 /* hours, minutes and seconds */
57 buf[i++] = bin2bcd(tm->tm_sec);
58 buf[i++] = bin2bcd(tm->tm_min);
59 buf[i++] = bin2bcd(tm->tm_hour);
60 buf[i++] = bin2bcd(tm->tm_mday);
61 buf[i++] = tm->tm_wday & 0x07;
62
63 /* month, 1 - 12 */
64 buf[i++] = bin2bcd(tm->tm_mon);
65
66 /* year */
67 buf[i++] = bin2bcd(tm->tm_year % 100);
68
69 /* write register's data */
70 ret = dm_i2c_write(dev, PCF2127_REG_SC, buf, i);
71
72 return ret;
73 }
74
pcf2127_rtc_get(struct udevice * dev,struct rtc_time * tm)75 static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
76 {
77 int ret = 0;
78 uchar buf[10] = { PCF2127_REG_CTRL1 };
79
80 ret = pcf2127_rtc_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
81 if (ret < 0)
82 return ret;
83
84 if (buf[PCF2127_REG_CTRL3] & 0x04)
85 puts("### Warning: RTC Low Voltage - date/time not reliable\n");
86
87 tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
88 tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
89 tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
90 tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
91 tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F);
92 tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
93 if (tm->tm_year < 1970)
94 tm->tm_year += 100; /* assume we are in 1970...2069 */
95 tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
96 tm->tm_yday = 0;
97 tm->tm_isdst = 0;
98
99 debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
100 tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
101 tm->tm_hour, tm->tm_min, tm->tm_sec);
102
103 return ret;
104 }
105
pcf2127_rtc_reset(struct udevice * dev)106 static int pcf2127_rtc_reset(struct udevice *dev)
107 {
108 /*Doing nothing here*/
109
110 return 0;
111 }
112
113 static const struct rtc_ops pcf2127_rtc_ops = {
114 .get = pcf2127_rtc_get,
115 .set = pcf2127_rtc_set,
116 .reset = pcf2127_rtc_reset,
117 .read = pcf2127_rtc_read,
118 .write = pcf2127_rtc_write,
119 };
120
121 static const struct udevice_id pcf2127_rtc_ids[] = {
122 { .compatible = "nxp,pcf2127" },
123 { .compatible = "nxp,pcf2129" },
124 { .compatible = "nxp,pca2129" },
125 { }
126 };
127
128 U_BOOT_DRIVER(rtc_pcf2127) = {
129 .name = "rtc-pcf2127",
130 .id = UCLASS_RTC,
131 .of_match = pcf2127_rtc_ids,
132 .ops = &pcf2127_rtc_ops,
133 };
134