blob: 319f0512ca8d6d6aae421b8430e905b48a9377e2 [file] [log] [blame]
Stefan Roese758c0372007-10-21 08:16:12 +02001/*
2 * (C) Copyright 2007
3 * Stefan Roese, DENX Software Engineering, sr@denx.de.
4 *
5 * based on a the Linux rtc-x1207.c driver which is:
6 * Copyright 2004 Karen Spearel
7 * Copyright 2005 Alessandro Zummo
8 *
9 * Information and datasheet:
10 * http://www.intersil.com/cda/deviceinfo/0,1477,X1205,00.html
11 *
12 * See file CREDITS for list of people who contributed to this
13 * project.
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 * MA 02111-1307 USA
29 */
30
31/*
32 * Date & Time support for Xicor/Intersil X1205 RTC
33 */
34
35/* #define DEBUG */
36
37#include <common.h>
38#include <command.h>
39#include <rtc.h>
40#include <i2c.h>
41#include <bcd.h>
42
43#if defined(CONFIG_RTC_X1205) && defined(CONFIG_CMD_DATE)
44
45#define CCR_SEC 0
46#define CCR_MIN 1
47#define CCR_HOUR 2
48#define CCR_MDAY 3
49#define CCR_MONTH 4
50#define CCR_YEAR 5
51#define CCR_WDAY 6
52#define CCR_Y2K 7
53
54#define X1205_REG_SR 0x3F /* status register */
55#define X1205_REG_Y2K 0x37
56#define X1205_REG_DW 0x36
57#define X1205_REG_YR 0x35
58#define X1205_REG_MO 0x34
59#define X1205_REG_DT 0x33
60#define X1205_REG_HR 0x32
61#define X1205_REG_MN 0x31
62#define X1205_REG_SC 0x30
63#define X1205_REG_DTR 0x13
64#define X1205_REG_ATR 0x12
65#define X1205_REG_INT 0x11
66#define X1205_REG_0 0x10
67#define X1205_REG_Y2K1 0x0F
68#define X1205_REG_DWA1 0x0E
69#define X1205_REG_YRA1 0x0D
70#define X1205_REG_MOA1 0x0C
71#define X1205_REG_DTA1 0x0B
72#define X1205_REG_HRA1 0x0A
73#define X1205_REG_MNA1 0x09
74#define X1205_REG_SCA1 0x08
75#define X1205_REG_Y2K0 0x07
76#define X1205_REG_DWA0 0x06
77#define X1205_REG_YRA0 0x05
78#define X1205_REG_MOA0 0x04
79#define X1205_REG_DTA0 0x03
80#define X1205_REG_HRA0 0x02
81#define X1205_REG_MNA0 0x01
82#define X1205_REG_SCA0 0x00
83
84#define X1205_CCR_BASE 0x30 /* Base address of CCR */
85#define X1205_ALM0_BASE 0x00 /* Base address of ALARM0 */
86
87#define X1205_SR_RTCF 0x01 /* Clock failure */
88#define X1205_SR_WEL 0x02 /* Write Enable Latch */
89#define X1205_SR_RWEL 0x04 /* Register Write Enable */
90
91#define X1205_DTR_DTR0 0x01
92#define X1205_DTR_DTR1 0x02
93#define X1205_DTR_DTR2 0x04
94
95#define X1205_HR_MIL 0x80 /* Set in ccr.hour for 24 hr mode */
96
97static void rtc_write(int reg, u8 val)
98{
99 i2c_write(CFG_I2C_RTC_ADDR, reg, 2, &val, 1);
100}
101
102/*
103 * In the routines that deal directly with the x1205 hardware, we use
104 * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
105 * Epoch is initialized as 2000. Time is set to UTC.
106 */
107void rtc_get(struct rtc_time *tm)
108{
109 u8 buf[8];
110
111 i2c_read(CFG_I2C_RTC_ADDR, X1205_CCR_BASE, 2, buf, 8);
112
113 debug("%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
114 "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
115 __FUNCTION__,
116 buf[0], buf[1], buf[2], buf[3],
117 buf[4], buf[5], buf[6], buf[7]);
118
119 tm->tm_sec = BCD2BIN(buf[CCR_SEC]);
120 tm->tm_min = BCD2BIN(buf[CCR_MIN]);
121 tm->tm_hour = BCD2BIN(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */
122 tm->tm_mday = BCD2BIN(buf[CCR_MDAY]);
123 tm->tm_mon = BCD2BIN(buf[CCR_MONTH]); /* mon is 0-11 */
124 tm->tm_year = BCD2BIN(buf[CCR_YEAR])
125 + (BCD2BIN(buf[CCR_Y2K]) * 100);
126 tm->tm_wday = buf[CCR_WDAY];
127
128 debug("%s: tm is secs=%d, mins=%d, hours=%d, "
129 "mday=%d, mon=%d, year=%d, wday=%d\n",
130 __FUNCTION__,
131 tm->tm_sec, tm->tm_min, tm->tm_hour,
132 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
133}
134
135void rtc_set(struct rtc_time *tm)
136{
137 int i;
138 u8 buf[8];
139
140 debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
141 tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
142 tm->tm_hour, tm->tm_min, tm->tm_sec);
143
144 buf[CCR_SEC] = BIN2BCD(tm->tm_sec);
145 buf[CCR_MIN] = BIN2BCD(tm->tm_min);
146
147 /* set hour and 24hr bit */
148 buf[CCR_HOUR] = BIN2BCD(tm->tm_hour) | X1205_HR_MIL;
149
150 buf[CCR_MDAY] = BIN2BCD(tm->tm_mday);
151
152 /* month, 1 - 12 */
153 buf[CCR_MONTH] = BIN2BCD(tm->tm_mon);
154
155 /* year, since the rtc epoch*/
156 buf[CCR_YEAR] = BIN2BCD(tm->tm_year % 100);
157 buf[CCR_WDAY] = tm->tm_wday & 0x07;
158 buf[CCR_Y2K] = BIN2BCD(tm->tm_year / 100);
159
160 /* this sequence is required to unlock the chip */
161 rtc_write(X1205_REG_SR, X1205_SR_WEL);
162 rtc_write(X1205_REG_SR, X1205_SR_WEL | X1205_SR_RWEL);
163
164 /* write register's data */
165 for (i = 0; i < 8; i++)
166 rtc_write(X1205_CCR_BASE + i, buf[i]);
167
168 rtc_write(X1205_REG_SR, 0);
169}
170
171void rtc_reset(void)
172{
173 /*
174 * Nothing to do
175 */
176}
177
178#endif