1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2001
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 */
6
7 /*
8 * Date & Time support for Philips PCF8563 RTC
9 */
10
11 /* #define DEBUG */
12
13 #include <common.h>
14 #include <command.h>
15 #include <dm.h>
16 #include <log.h>
17 #include <rtc.h>
18 #include <i2c.h>
19
20 #if !CONFIG_IS_ENABLED(DM_RTC)
21 static uchar rtc_read (uchar reg);
22 static void rtc_write (uchar reg, uchar val);
23
24 /* ------------------------------------------------------------------------- */
25
rtc_get(struct rtc_time * tmp)26 int rtc_get (struct rtc_time *tmp)
27 {
28 int rel = 0;
29 uchar sec, min, hour, mday, wday, mon_cent, year;
30
31 sec = rtc_read (0x02);
32 min = rtc_read (0x03);
33 hour = rtc_read (0x04);
34 mday = rtc_read (0x05);
35 wday = rtc_read (0x06);
36 mon_cent= rtc_read (0x07);
37 year = rtc_read (0x08);
38
39 debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
40 "hr: %02x min: %02x sec: %02x\n",
41 year, mon_cent, mday, wday,
42 hour, min, sec );
43 debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
44 rtc_read (0x0C),
45 rtc_read (0x0B),
46 rtc_read (0x0A),
47 rtc_read (0x09) );
48
49 if (sec & 0x80) {
50 puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
51 rel = -1;
52 }
53
54 tmp->tm_sec = bcd2bin (sec & 0x7F);
55 tmp->tm_min = bcd2bin (min & 0x7F);
56 tmp->tm_hour = bcd2bin (hour & 0x3F);
57 tmp->tm_mday = bcd2bin (mday & 0x3F);
58 tmp->tm_mon = bcd2bin (mon_cent & 0x1F);
59 tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000);
60 tmp->tm_wday = bcd2bin (wday & 0x07);
61 tmp->tm_yday = 0;
62 tmp->tm_isdst= 0;
63
64 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
65 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
66 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
67
68 return rel;
69 }
70
rtc_set(struct rtc_time * tmp)71 int rtc_set (struct rtc_time *tmp)
72 {
73 uchar century;
74
75 debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
76 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
77 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
78
79 rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
80
81 century = (tmp->tm_year >= 2000) ? 0 : 0x80;
82 rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
83
84 rtc_write (0x06, bin2bcd(tmp->tm_wday));
85 rtc_write (0x05, bin2bcd(tmp->tm_mday));
86 rtc_write (0x04, bin2bcd(tmp->tm_hour));
87 rtc_write (0x03, bin2bcd(tmp->tm_min ));
88 rtc_write (0x02, bin2bcd(tmp->tm_sec ));
89
90 return 0;
91 }
92
rtc_reset(void)93 void rtc_reset (void)
94 {
95 /* clear all control & status registers */
96 rtc_write (0x00, 0x00);
97 rtc_write (0x01, 0x00);
98 rtc_write (0x0D, 0x00);
99
100 /* clear Voltage Low bit */
101 rtc_write (0x02, rtc_read (0x02) & 0x7F);
102
103 /* reset all alarms */
104 rtc_write (0x09, 0x00);
105 rtc_write (0x0A, 0x00);
106 rtc_write (0x0B, 0x00);
107 rtc_write (0x0C, 0x00);
108 }
109
110 /* ------------------------------------------------------------------------- */
111
rtc_read(uchar reg)112 static uchar rtc_read (uchar reg)
113 {
114 return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
115 }
116
rtc_write(uchar reg,uchar val)117 static void rtc_write (uchar reg, uchar val)
118 {
119 i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
120 }
121 #else
pcf8563_rtc_get(struct udevice * dev,struct rtc_time * tmp)122 static int pcf8563_rtc_get(struct udevice *dev, struct rtc_time *tmp)
123 {
124 int rel = 0;
125 uchar sec, min, hour, mday, wday, mon_cent, year;
126
127 sec = dm_i2c_reg_read(dev, 0x02);
128 min = dm_i2c_reg_read(dev, 0x03);
129 hour = dm_i2c_reg_read(dev, 0x04);
130 mday = dm_i2c_reg_read(dev, 0x05);
131 wday = dm_i2c_reg_read(dev, 0x06);
132 mon_cent = dm_i2c_reg_read(dev, 0x07);
133 year = dm_i2c_reg_read(dev, 0x08);
134
135 debug("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x ",
136 year, mon_cent, mday, wday);
137 debug("hr: %02x min: %02x sec: %02x\n",
138 hour, min, sec);
139 debug("Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
140 dm_i2c_reg_read(dev, 0x0C),
141 dm_i2c_reg_read(dev, 0x0B),
142 dm_i2c_reg_read(dev, 0x0A),
143 dm_i2c_reg_read(dev, 0x09));
144
145 if (sec & 0x80) {
146 puts("### Warning: RTC Low Voltage - date/time not reliable\n");
147 rel = -1;
148 }
149
150 tmp->tm_sec = bcd2bin(sec & 0x7F);
151 tmp->tm_min = bcd2bin(min & 0x7F);
152 tmp->tm_hour = bcd2bin(hour & 0x3F);
153 tmp->tm_mday = bcd2bin(mday & 0x3F);
154 tmp->tm_mon = bcd2bin(mon_cent & 0x1F);
155 tmp->tm_year = bcd2bin(year) + ((mon_cent & 0x80) ? 1900 : 2000);
156 tmp->tm_wday = bcd2bin(wday & 0x07);
157 tmp->tm_yday = 0;
158 tmp->tm_isdst = 0;
159
160 debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
161 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
162 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
163
164 return rel;
165 }
166
pcf8563_rtc_set(struct udevice * dev,const struct rtc_time * tmp)167 static int pcf8563_rtc_set(struct udevice *dev, const struct rtc_time *tmp)
168 {
169 uchar century;
170
171 debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
172 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
173 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
174
175 dm_i2c_reg_write(dev, 0x08, bin2bcd(tmp->tm_year % 100));
176
177 century = (tmp->tm_year >= 2000) ? 0 : 0x80;
178 dm_i2c_reg_write(dev, 0x07, bin2bcd(tmp->tm_mon) | century);
179
180 dm_i2c_reg_write(dev, 0x06, bin2bcd(tmp->tm_wday));
181 dm_i2c_reg_write(dev, 0x05, bin2bcd(tmp->tm_mday));
182 dm_i2c_reg_write(dev, 0x04, bin2bcd(tmp->tm_hour));
183 dm_i2c_reg_write(dev, 0x03, bin2bcd(tmp->tm_min));
184 dm_i2c_reg_write(dev, 0x02, bin2bcd(tmp->tm_sec));
185
186 return 0;
187 }
188
pcf8563_rtc_reset(struct udevice * dev)189 static int pcf8563_rtc_reset(struct udevice *dev)
190 {
191 /* clear all control & status registers */
192 dm_i2c_reg_write(dev, 0x00, 0x00);
193 dm_i2c_reg_write(dev, 0x01, 0x00);
194 dm_i2c_reg_write(dev, 0x0D, 0x00);
195
196 /* clear Voltage Low bit */
197 dm_i2c_reg_write(dev, 0x02, dm_i2c_reg_read(dev, 0x02) & 0x7F);
198
199 /* reset all alarms */
200 dm_i2c_reg_write(dev, 0x09, 0x00);
201 dm_i2c_reg_write(dev, 0x0A, 0x00);
202 dm_i2c_reg_write(dev, 0x0B, 0x00);
203 dm_i2c_reg_write(dev, 0x0C, 0x00);
204
205 return 0;
206 }
207
208 static const struct rtc_ops pcf8563_rtc_ops = {
209 .get = pcf8563_rtc_get,
210 .set = pcf8563_rtc_set,
211 .reset = pcf8563_rtc_reset,
212 };
213
214 static const struct udevice_id pcf8563_rtc_ids[] = {
215 { .compatible = "nxp,pcf8563" },
216 { }
217 };
218
219 U_BOOT_DRIVER(rtc_pcf8563) = {
220 .name = "rtc-pcf8563",
221 .id = UCLASS_RTC,
222 .of_match = pcf8563_rtc_ids,
223 .ops = &pcf8563_rtc_ops,
224 };
225 #endif
226