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Meng Yi8f3a8422016-11-30 15:47:31 +08001/*
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>
Simon Glassf7ae49f2020-05-10 11:40:05 -060012#include <log.h>
Meng Yi8f3a8422016-11-30 15:47:31 +080013#include <rtc.h>
14
Meng Yi45a01942017-01-09 11:24:51 -070015#define PCF2127_REG_CTRL1 0x00
16#define PCF2127_REG_CTRL2 0x01
17#define PCF2127_REG_CTRL3 0x02
18#define PCF2127_REG_SC 0x03
19#define PCF2127_REG_MN 0x04
20#define PCF2127_REG_HR 0x05
21#define PCF2127_REG_DM 0x06
22#define PCF2127_REG_DW 0x07
23#define PCF2127_REG_MO 0x08
24#define PCF2127_REG_YR 0x09
Meng Yi8f3a8422016-11-30 15:47:31 +080025
Rasmus Villemoesa518dd62020-07-06 22:01:13 +020026static int pcf2127_rtc_read(struct udevice *dev, uint offset, u8 *buffer, uint len)
Chuanhua Hanef6c26d2019-07-08 11:45:25 +080027{
Simon Glasscaa4daa2020-12-03 16:55:18 -070028 struct dm_i2c_chip *chip = dev_get_parent_plat(dev);
Chuanhua Hanef6c26d2019-07-08 11:45:25 +080029 struct i2c_msg msg;
30 int ret;
31
32 /* Set the address of the start register to be read */
33 ret = dm_i2c_write(dev, offset, NULL, 0);
34 if (ret < 0)
35 return ret;
36
37 /* Read register's data */
38 msg.addr = chip->chip_addr;
39 msg.flags |= I2C_M_RD;
40 msg.len = len;
41 msg.buf = buffer;
42
43 return dm_i2c_xfer(dev, &msg, 1);
44}
45
Rasmus Villemoes29f965a2020-07-06 22:01:14 +020046static int pcf2127_rtc_write(struct udevice *dev, uint offset,
47 const u8 *buffer, uint len)
48{
49 return dm_i2c_write(dev, offset, buffer, len);
50}
51
Meng Yi8f3a8422016-11-30 15:47:31 +080052static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm)
53{
Chuanhua Hanef6c26d2019-07-08 11:45:25 +080054 uchar buf[7] = {0};
Meng Yi45a01942017-01-09 11:24:51 -070055 int i = 0, ret;
Meng Yi8f3a8422016-11-30 15:47:31 +080056
Meng Yi8f3a8422016-11-30 15:47:31 +080057 /* hours, minutes and seconds */
58 buf[i++] = bin2bcd(tm->tm_sec);
59 buf[i++] = bin2bcd(tm->tm_min);
60 buf[i++] = bin2bcd(tm->tm_hour);
61 buf[i++] = bin2bcd(tm->tm_mday);
62 buf[i++] = tm->tm_wday & 0x07;
63
64 /* month, 1 - 12 */
Rasmus Villemoesb8a42e02020-05-01 15:24:50 +020065 buf[i++] = bin2bcd(tm->tm_mon);
Meng Yi8f3a8422016-11-30 15:47:31 +080066
67 /* year */
68 buf[i++] = bin2bcd(tm->tm_year % 100);
69
70 /* write register's data */
Chuanhua Hanef6c26d2019-07-08 11:45:25 +080071 ret = dm_i2c_write(dev, PCF2127_REG_SC, buf, i);
Meng Yi8f3a8422016-11-30 15:47:31 +080072
Meng Yi45a01942017-01-09 11:24:51 -070073 return ret;
Meng Yi8f3a8422016-11-30 15:47:31 +080074}
75
76static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
77{
Meng Yi45a01942017-01-09 11:24:51 -070078 int ret = 0;
Meng Yi8f3a8422016-11-30 15:47:31 +080079 uchar buf[10] = { PCF2127_REG_CTRL1 };
80
Rasmus Villemoesa518dd62020-07-06 22:01:13 +020081 ret = pcf2127_rtc_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
Meng Yi45a01942017-01-09 11:24:51 -070082 if (ret < 0)
83 return ret;
Meng Yi8f3a8422016-11-30 15:47:31 +080084
85 if (buf[PCF2127_REG_CTRL3] & 0x04)
86 puts("### Warning: RTC Low Voltage - date/time not reliable\n");
87
88 tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
89 tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
90 tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
91 tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
Rasmus Villemoesb8a42e02020-05-01 15:24:50 +020092 tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F);
Meng Yi8f3a8422016-11-30 15:47:31 +080093 tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
94 if (tm->tm_year < 1970)
95 tm->tm_year += 100; /* assume we are in 1970...2069 */
96 tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
97 tm->tm_yday = 0;
98 tm->tm_isdst = 0;
99
100 debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
101 tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
102 tm->tm_hour, tm->tm_min, tm->tm_sec);
103
Meng Yi45a01942017-01-09 11:24:51 -0700104 return ret;
Meng Yi8f3a8422016-11-30 15:47:31 +0800105}
106
107static int pcf2127_rtc_reset(struct udevice *dev)
108{
109 /*Doing nothing here*/
Meng Yi45a01942017-01-09 11:24:51 -0700110
Meng Yi8f3a8422016-11-30 15:47:31 +0800111 return 0;
112}
113
114static const struct rtc_ops pcf2127_rtc_ops = {
115 .get = pcf2127_rtc_get,
116 .set = pcf2127_rtc_set,
117 .reset = pcf2127_rtc_reset,
Rasmus Villemoesa518dd62020-07-06 22:01:13 +0200118 .read = pcf2127_rtc_read,
Rasmus Villemoes29f965a2020-07-06 22:01:14 +0200119 .write = pcf2127_rtc_write,
Meng Yi8f3a8422016-11-30 15:47:31 +0800120};
121
122static const struct udevice_id pcf2127_rtc_ids[] = {
123 { .compatible = "pcf2127-rtc" },
124 { }
125};
126
127U_BOOT_DRIVER(rtc_pcf2127) = {
128 .name = "rtc-pcf2127",
129 .id = UCLASS_RTC,
130 .of_match = pcf2127_rtc_ids,
131 .ops = &pcf2127_rtc_ops,
132};