3 * Stefan Roese, DENX Software Engineering, sr@denx.de.
5 * based on a the Linux rtc-x1207.c driver which is:
6 * Copyright 2004 Karen Spearel
7 * Copyright 2005 Alessandro Zummo
9 * Information and datasheet:
10 * http://www.intersil.com/cda/deviceinfo/0,1477,X1205,00.html
12 * SPDX-License-Identifier: GPL-2.0+
16 * Date & Time support for Xicor/Intersil X1205 RTC
26 #if defined(CONFIG_CMD_DATE)
37 #define X1205_REG_SR 0x3F /* status register */
38 #define X1205_REG_Y2K 0x37
39 #define X1205_REG_DW 0x36
40 #define X1205_REG_YR 0x35
41 #define X1205_REG_MO 0x34
42 #define X1205_REG_DT 0x33
43 #define X1205_REG_HR 0x32
44 #define X1205_REG_MN 0x31
45 #define X1205_REG_SC 0x30
46 #define X1205_REG_DTR 0x13
47 #define X1205_REG_ATR 0x12
48 #define X1205_REG_INT 0x11
49 #define X1205_REG_0 0x10
50 #define X1205_REG_Y2K1 0x0F
51 #define X1205_REG_DWA1 0x0E
52 #define X1205_REG_YRA1 0x0D
53 #define X1205_REG_MOA1 0x0C
54 #define X1205_REG_DTA1 0x0B
55 #define X1205_REG_HRA1 0x0A
56 #define X1205_REG_MNA1 0x09
57 #define X1205_REG_SCA1 0x08
58 #define X1205_REG_Y2K0 0x07
59 #define X1205_REG_DWA0 0x06
60 #define X1205_REG_YRA0 0x05
61 #define X1205_REG_MOA0 0x04
62 #define X1205_REG_DTA0 0x03
63 #define X1205_REG_HRA0 0x02
64 #define X1205_REG_MNA0 0x01
65 #define X1205_REG_SCA0 0x00
67 #define X1205_CCR_BASE 0x30 /* Base address of CCR */
68 #define X1205_ALM0_BASE 0x00 /* Base address of ALARM0 */
70 #define X1205_SR_RTCF 0x01 /* Clock failure */
71 #define X1205_SR_WEL 0x02 /* Write Enable Latch */
72 #define X1205_SR_RWEL 0x04 /* Register Write Enable */
74 #define X1205_DTR_DTR0 0x01
75 #define X1205_DTR_DTR1 0x02
76 #define X1205_DTR_DTR2 0x04
78 #define X1205_HR_MIL 0x80 /* Set in ccr.hour for 24 hr mode */
80 static void rtc_write(int reg, u8 val)
82 i2c_write(CONFIG_SYS_I2C_RTC_ADDR, reg, 2, &val, 1);
86 * In the routines that deal directly with the x1205 hardware, we use
87 * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
88 * Epoch is initialized as 2000. Time is set to UTC.
90 int rtc_get(struct rtc_time *tm)
94 i2c_read(CONFIG_SYS_I2C_RTC_ADDR, X1205_CCR_BASE, 2, buf, 8);
96 debug("%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
97 "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
99 buf[0], buf[1], buf[2], buf[3],
100 buf[4], buf[5], buf[6], buf[7]);
102 tm->tm_sec = bcd2bin(buf[CCR_SEC]);
103 tm->tm_min = bcd2bin(buf[CCR_MIN]);
104 tm->tm_hour = bcd2bin(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */
105 tm->tm_mday = bcd2bin(buf[CCR_MDAY]);
106 tm->tm_mon = bcd2bin(buf[CCR_MONTH]); /* mon is 0-11 */
107 tm->tm_year = bcd2bin(buf[CCR_YEAR])
108 + (bcd2bin(buf[CCR_Y2K]) * 100);
109 tm->tm_wday = buf[CCR_WDAY];
111 debug("%s: tm is secs=%d, mins=%d, hours=%d, "
112 "mday=%d, mon=%d, year=%d, wday=%d\n",
114 tm->tm_sec, tm->tm_min, tm->tm_hour,
115 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
120 int rtc_set(struct rtc_time *tm)
125 debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
126 tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
127 tm->tm_hour, tm->tm_min, tm->tm_sec);
129 buf[CCR_SEC] = bin2bcd(tm->tm_sec);
130 buf[CCR_MIN] = bin2bcd(tm->tm_min);
132 /* set hour and 24hr bit */
133 buf[CCR_HOUR] = bin2bcd(tm->tm_hour) | X1205_HR_MIL;
135 buf[CCR_MDAY] = bin2bcd(tm->tm_mday);
138 buf[CCR_MONTH] = bin2bcd(tm->tm_mon);
140 /* year, since the rtc epoch*/
141 buf[CCR_YEAR] = bin2bcd(tm->tm_year % 100);
142 buf[CCR_WDAY] = tm->tm_wday & 0x07;
143 buf[CCR_Y2K] = bin2bcd(tm->tm_year / 100);
145 /* this sequence is required to unlock the chip */
146 rtc_write(X1205_REG_SR, X1205_SR_WEL);
147 rtc_write(X1205_REG_SR, X1205_SR_WEL | X1205_SR_RWEL);
149 /* write register's data */
150 for (i = 0; i < 8; i++)
151 rtc_write(X1205_CCR_BASE + i, buf[i]);
153 rtc_write(X1205_REG_SR, 0);