1 // SPDX-License-Identifier: GPL-2.0+
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
8 * Date & Time support for Philips PCF8563 RTC
19 #if !CONFIG_IS_ENABLED(DM_RTC)
20 static uchar rtc_read (uchar reg);
21 static void rtc_write (uchar reg, uchar val);
23 /* ------------------------------------------------------------------------- */
25 int rtc_get (struct rtc_time *tmp)
28 uchar sec, min, hour, mday, wday, mon_cent, year;
30 sec = rtc_read (0x02);
31 min = rtc_read (0x03);
32 hour = rtc_read (0x04);
33 mday = rtc_read (0x05);
34 wday = rtc_read (0x06);
35 mon_cent= rtc_read (0x07);
36 year = rtc_read (0x08);
38 debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
39 "hr: %02x min: %02x sec: %02x\n",
40 year, mon_cent, mday, wday,
42 debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
49 puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
53 tmp->tm_sec = bcd2bin (sec & 0x7F);
54 tmp->tm_min = bcd2bin (min & 0x7F);
55 tmp->tm_hour = bcd2bin (hour & 0x3F);
56 tmp->tm_mday = bcd2bin (mday & 0x3F);
57 tmp->tm_mon = bcd2bin (mon_cent & 0x1F);
58 tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000);
59 tmp->tm_wday = bcd2bin (wday & 0x07);
63 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
64 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
65 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
70 int rtc_set (struct rtc_time *tmp)
74 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
75 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
76 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
78 rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
80 century = (tmp->tm_year >= 2000) ? 0 : 0x80;
81 rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
83 rtc_write (0x06, bin2bcd(tmp->tm_wday));
84 rtc_write (0x05, bin2bcd(tmp->tm_mday));
85 rtc_write (0x04, bin2bcd(tmp->tm_hour));
86 rtc_write (0x03, bin2bcd(tmp->tm_min ));
87 rtc_write (0x02, bin2bcd(tmp->tm_sec ));
94 /* clear all control & status registers */
95 rtc_write (0x00, 0x00);
96 rtc_write (0x01, 0x00);
97 rtc_write (0x0D, 0x00);
99 /* clear Voltage Low bit */
100 rtc_write (0x02, rtc_read (0x02) & 0x7F);
102 /* reset all alarms */
103 rtc_write (0x09, 0x00);
104 rtc_write (0x0A, 0x00);
105 rtc_write (0x0B, 0x00);
106 rtc_write (0x0C, 0x00);
109 /* ------------------------------------------------------------------------- */
111 static uchar rtc_read (uchar reg)
113 return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
116 static void rtc_write (uchar reg, uchar val)
118 i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
121 static int pcf8563_rtc_get(struct udevice *dev, struct rtc_time *tmp)
124 uchar sec, min, hour, mday, wday, mon_cent, year;
126 sec = dm_i2c_reg_read(dev, 0x02);
127 min = dm_i2c_reg_read(dev, 0x03);
128 hour = dm_i2c_reg_read(dev, 0x04);
129 mday = dm_i2c_reg_read(dev, 0x05);
130 wday = dm_i2c_reg_read(dev, 0x06);
131 mon_cent = dm_i2c_reg_read(dev, 0x07);
132 year = dm_i2c_reg_read(dev, 0x08);
134 debug("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x ",
135 year, mon_cent, mday, wday);
136 debug("hr: %02x min: %02x sec: %02x\n",
138 debug("Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
139 dm_i2c_reg_read(dev, 0x0C),
140 dm_i2c_reg_read(dev, 0x0B),
141 dm_i2c_reg_read(dev, 0x0A),
142 dm_i2c_reg_read(dev, 0x09));
145 puts("### Warning: RTC Low Voltage - date/time not reliable\n");
149 tmp->tm_sec = bcd2bin(sec & 0x7F);
150 tmp->tm_min = bcd2bin(min & 0x7F);
151 tmp->tm_hour = bcd2bin(hour & 0x3F);
152 tmp->tm_mday = bcd2bin(mday & 0x3F);
153 tmp->tm_mon = bcd2bin(mon_cent & 0x1F);
154 tmp->tm_year = bcd2bin(year) + ((mon_cent & 0x80) ? 1900 : 2000);
155 tmp->tm_wday = bcd2bin(wday & 0x07);
159 debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
160 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
161 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
166 static int pcf8563_rtc_set(struct udevice *dev, const struct rtc_time *tmp)
170 debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
171 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
172 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
174 dm_i2c_reg_write(dev, 0x08, bin2bcd(tmp->tm_year % 100));
176 century = (tmp->tm_year >= 2000) ? 0 : 0x80;
177 dm_i2c_reg_write(dev, 0x07, bin2bcd(tmp->tm_mon) | century);
179 dm_i2c_reg_write(dev, 0x06, bin2bcd(tmp->tm_wday));
180 dm_i2c_reg_write(dev, 0x05, bin2bcd(tmp->tm_mday));
181 dm_i2c_reg_write(dev, 0x04, bin2bcd(tmp->tm_hour));
182 dm_i2c_reg_write(dev, 0x03, bin2bcd(tmp->tm_min));
183 dm_i2c_reg_write(dev, 0x02, bin2bcd(tmp->tm_sec));
188 static int pcf8563_rtc_reset(struct udevice *dev)
190 /* clear all control & status registers */
191 dm_i2c_reg_write(dev, 0x00, 0x00);
192 dm_i2c_reg_write(dev, 0x01, 0x00);
193 dm_i2c_reg_write(dev, 0x0D, 0x00);
195 /* clear Voltage Low bit */
196 dm_i2c_reg_write(dev, 0x02, dm_i2c_reg_read(dev, 0x02) & 0x7F);
198 /* reset all alarms */
199 dm_i2c_reg_write(dev, 0x09, 0x00);
200 dm_i2c_reg_write(dev, 0x0A, 0x00);
201 dm_i2c_reg_write(dev, 0x0B, 0x00);
202 dm_i2c_reg_write(dev, 0x0C, 0x00);
207 static const struct rtc_ops pcf8563_rtc_ops = {
208 .get = pcf8563_rtc_get,
209 .set = pcf8563_rtc_set,
210 .reset = pcf8563_rtc_reset,
213 static const struct udevice_id pcf8563_rtc_ids[] = {
214 { .compatible = "nxp,pcf8563" },
218 U_BOOT_DRIVER(rtc_pcf8563) = {
219 .name = "rtc-pcf8563",
221 .of_match = pcf8563_rtc_ids,
222 .ops = &pcf8563_rtc_ops,