]>
git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/rtc/m41t62.c
3 * Stefan Roese, DENX Software Engineering, sr@denx.de.
5 * based on a the Linux rtc-m41t80.c driver which is:
6 * Alexander Bigga <ab@mycable.de>, 2006 (c) mycable GmbH
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.
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.
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,
25 * Date & Time support for STMicroelectronics M41T62
35 #if defined(CONFIG_CMD_DATE)
37 #define M41T62_REG_SSEC 0
38 #define M41T62_REG_SEC 1
39 #define M41T62_REG_MIN 2
40 #define M41T62_REG_HOUR 3
41 #define M41T62_REG_WDAY 4
42 #define M41T62_REG_DAY 5
43 #define M41T62_REG_MON 6
44 #define M41T62_REG_YEAR 7
45 #define M41T62_REG_ALARM_MON 0xa
46 #define M41T62_REG_ALARM_DAY 0xb
47 #define M41T62_REG_ALARM_HOUR 0xc
48 #define M41T62_REG_ALARM_MIN 0xd
49 #define M41T62_REG_ALARM_SEC 0xe
50 #define M41T62_REG_FLAGS 0xf
52 #define M41T62_DATETIME_REG_SIZE (M41T62_REG_YEAR + 1)
53 #define M41T62_ALARM_REG_SIZE \
54 (M41T62_REG_ALARM_SEC + 1 - M41T62_REG_ALARM_MON)
56 #define M41T62_SEC_ST (1 << 7) /* ST: Stop Bit */
57 #define M41T62_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */
58 #define M41T62_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */
59 #define M41T62_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */
60 #define M41T62_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */
61 #define M41T62_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */
63 #define M41T62_FEATURE_HT (1 << 0)
64 #define M41T62_FEATURE_BL (1 << 1)
66 int rtc_get(struct rtc_time
*tm
)
68 u8 buf
[M41T62_DATETIME_REG_SIZE
];
70 i2c_read(CONFIG_SYS_I2C_RTC_ADDR
, 0, 1, buf
, M41T62_DATETIME_REG_SIZE
);
72 debug("%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
73 "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
75 buf
[0], buf
[1], buf
[2], buf
[3],
76 buf
[4], buf
[5], buf
[6], buf
[7]);
78 tm
->tm_sec
= bcd2bin(buf
[M41T62_REG_SEC
] & 0x7f);
79 tm
->tm_min
= bcd2bin(buf
[M41T62_REG_MIN
] & 0x7f);
80 tm
->tm_hour
= bcd2bin(buf
[M41T62_REG_HOUR
] & 0x3f);
81 tm
->tm_mday
= bcd2bin(buf
[M41T62_REG_DAY
] & 0x3f);
82 tm
->tm_wday
= buf
[M41T62_REG_WDAY
] & 0x07;
83 tm
->tm_mon
= bcd2bin(buf
[M41T62_REG_MON
] & 0x1f);
85 /* assume 20YY not 19YY, and ignore the Century Bit */
86 /* U-Boot needs to add 1900 here */
87 tm
->tm_year
= bcd2bin(buf
[M41T62_REG_YEAR
]) + 100 + 1900;
89 debug("%s: tm is secs=%d, mins=%d, hours=%d, "
90 "mday=%d, mon=%d, year=%d, wday=%d\n",
92 tm
->tm_sec
, tm
->tm_min
, tm
->tm_hour
,
93 tm
->tm_mday
, tm
->tm_mon
, tm
->tm_year
, tm
->tm_wday
);
98 int rtc_set(struct rtc_time
*tm
)
100 u8 buf
[M41T62_DATETIME_REG_SIZE
];
102 debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
103 tm
->tm_year
, tm
->tm_mon
, tm
->tm_mday
, tm
->tm_wday
,
104 tm
->tm_hour
, tm
->tm_min
, tm
->tm_sec
);
106 i2c_read(CONFIG_SYS_I2C_RTC_ADDR
, 0, 1, buf
, M41T62_DATETIME_REG_SIZE
);
108 /* Merge time-data and register flags into buf[0..7] */
109 buf
[M41T62_REG_SSEC
] = 0;
110 buf
[M41T62_REG_SEC
] =
111 bin2bcd(tm
->tm_sec
) | (buf
[M41T62_REG_SEC
] & ~0x7f);
112 buf
[M41T62_REG_MIN
] =
113 bin2bcd(tm
->tm_min
) | (buf
[M41T62_REG_MIN
] & ~0x7f);
114 buf
[M41T62_REG_HOUR
] =
115 bin2bcd(tm
->tm_hour
) | (buf
[M41T62_REG_HOUR
] & ~0x3f) ;
116 buf
[M41T62_REG_WDAY
] =
117 (tm
->tm_wday
& 0x07) | (buf
[M41T62_REG_WDAY
] & ~0x07);
118 buf
[M41T62_REG_DAY
] =
119 bin2bcd(tm
->tm_mday
) | (buf
[M41T62_REG_DAY
] & ~0x3f);
120 buf
[M41T62_REG_MON
] =
121 bin2bcd(tm
->tm_mon
) | (buf
[M41T62_REG_MON
] & ~0x1f);
122 /* assume 20YY not 19YY */
123 buf
[M41T62_REG_YEAR
] = bin2bcd(tm
->tm_year
% 100);
125 if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR
, 0, 1, buf
, M41T62_DATETIME_REG_SIZE
)) {
126 printf("I2C write failed in %s()\n", __func__
);