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Stefan Roese88aff622008-02-19 16:21:49 +01001/*
2 * (C) Copyright 2008
3 * Stefan Roese, DENX Software Engineering, sr@denx.de.
4 *
5 * based on a the Linux rtc-m41t80.c driver which is:
6 * Alexander Bigga <ab@mycable.de>, 2006 (c) mycable GmbH
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24/*
25 * Date & Time support for STMicroelectronics M41T62
26 */
27
28/* #define DEBUG */
29
30#include <common.h>
31#include <command.h>
32#include <rtc.h>
33#include <i2c.h>
34#include <bcd.h>
35
36#if defined(CONFIG_CMD_DATE)
37
38#define M41T62_REG_SSEC 0
39#define M41T62_REG_SEC 1
40#define M41T62_REG_MIN 2
41#define M41T62_REG_HOUR 3
42#define M41T62_REG_WDAY 4
43#define M41T62_REG_DAY 5
44#define M41T62_REG_MON 6
45#define M41T62_REG_YEAR 7
46#define M41T62_REG_ALARM_MON 0xa
47#define M41T62_REG_ALARM_DAY 0xb
48#define M41T62_REG_ALARM_HOUR 0xc
49#define M41T62_REG_ALARM_MIN 0xd
50#define M41T62_REG_ALARM_SEC 0xe
51#define M41T62_REG_FLAGS 0xf
52
53#define M41T62_DATETIME_REG_SIZE (M41T62_REG_YEAR + 1)
54#define M41T62_ALARM_REG_SIZE \
55 (M41T62_REG_ALARM_SEC + 1 - M41T62_REG_ALARM_MON)
56
57#define M41T62_SEC_ST (1 << 7) /* ST: Stop Bit */
58#define M41T62_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */
59#define M41T62_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */
60#define M41T62_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */
61#define M41T62_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */
62#define M41T62_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */
63
64#define M41T62_FEATURE_HT (1 << 0)
65#define M41T62_FEATURE_BL (1 << 1)
66
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030067int rtc_get(struct rtc_time *tm)
Stefan Roese88aff622008-02-19 16:21:49 +010068{
69 u8 buf[M41T62_DATETIME_REG_SIZE];
70
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020071 i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE);
Stefan Roese88aff622008-02-19 16:21:49 +010072
73 debug("%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
74 "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
75 __FUNCTION__,
76 buf[0], buf[1], buf[2], buf[3],
77 buf[4], buf[5], buf[6], buf[7]);
78
79 tm->tm_sec = BCD2BIN(buf[M41T62_REG_SEC] & 0x7f);
80 tm->tm_min = BCD2BIN(buf[M41T62_REG_MIN] & 0x7f);
81 tm->tm_hour = BCD2BIN(buf[M41T62_REG_HOUR] & 0x3f);
82 tm->tm_mday = BCD2BIN(buf[M41T62_REG_DAY] & 0x3f);
83 tm->tm_wday = buf[M41T62_REG_WDAY] & 0x07;
Stefan Roese0072b782008-04-30 15:50:39 +020084 tm->tm_mon = BCD2BIN(buf[M41T62_REG_MON] & 0x1f);
Stefan Roese88aff622008-02-19 16:21:49 +010085
86 /* assume 20YY not 19YY, and ignore the Century Bit */
87 /* U-Boot needs to add 1900 here */
88 tm->tm_year = BCD2BIN(buf[M41T62_REG_YEAR]) + 100 + 1900;
89
90 debug("%s: tm is secs=%d, mins=%d, hours=%d, "
91 "mday=%d, mon=%d, year=%d, wday=%d\n",
92 __FUNCTION__,
93 tm->tm_sec, tm->tm_min, tm->tm_hour,
94 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030095
96 return 0;
Stefan Roese88aff622008-02-19 16:21:49 +010097}
98
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +020099int rtc_set(struct rtc_time *tm)
Stefan Roese88aff622008-02-19 16:21:49 +0100100{
101 u8 buf[M41T62_DATETIME_REG_SIZE];
102
103 debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
104 tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
105 tm->tm_hour, tm->tm_min, tm->tm_sec);
106
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200107 i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE);
Stefan Roese88aff622008-02-19 16:21:49 +0100108
109 /* Merge time-data and register flags into buf[0..7] */
110 buf[M41T62_REG_SSEC] = 0;
111 buf[M41T62_REG_SEC] =
112 BIN2BCD(tm->tm_sec) | (buf[M41T62_REG_SEC] & ~0x7f);
113 buf[M41T62_REG_MIN] =
114 BIN2BCD(tm->tm_min) | (buf[M41T62_REG_MIN] & ~0x7f);
115 buf[M41T62_REG_HOUR] =
116 BIN2BCD(tm->tm_hour) | (buf[M41T62_REG_HOUR] & ~0x3f) ;
117 buf[M41T62_REG_WDAY] =
118 (tm->tm_wday & 0x07) | (buf[M41T62_REG_WDAY] & ~0x07);
119 buf[M41T62_REG_DAY] =
120 BIN2BCD(tm->tm_mday) | (buf[M41T62_REG_DAY] & ~0x3f);
121 buf[M41T62_REG_MON] =
Stefan Roese0072b782008-04-30 15:50:39 +0200122 BIN2BCD(tm->tm_mon) | (buf[M41T62_REG_MON] & ~0x1f);
Stefan Roese88aff622008-02-19 16:21:49 +0100123 /* assume 20YY not 19YY */
124 buf[M41T62_REG_YEAR] = BIN2BCD(tm->tm_year % 100);
125
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200126 if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, buf, M41T62_DATETIME_REG_SIZE)) {
Stefan Roese88aff622008-02-19 16:21:49 +0100127 printf("I2C write failed in %s()\n", __func__);
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200128 return -1;
129 }
130
131 return 0;
Stefan Roese88aff622008-02-19 16:21:49 +0100132}
133
134void rtc_reset(void)
135{
136 /*
137 * Nothing to do
138 */
139}
140
141#endif