]>
git.ipfire.org Git - people/ms/u-boot.git/blob - drivers/rtc/rx8025.c
3 * Matthias Fuchs, esd gmbh, matthias.fuchs@esd-electronics.com.
5 * SPDX-License-Identifier: GPL-2.0+
9 * Epson RX8025 RTC driver.
17 #if defined(CONFIG_CMD_DATE)
19 /*---------------------------------------------------------------------*/
23 #define DEBUGR(fmt,args...) printf(fmt ,##args)
25 #define DEBUGR(fmt,args...)
27 /*---------------------------------------------------------------------*/
29 #ifndef CONFIG_SYS_I2C_RTC_ADDR
30 # define CONFIG_SYS_I2C_RTC_ADDR 0x32
34 * RTC register addresses
36 #define RTC_SEC_REG_ADDR 0x00
37 #define RTC_MIN_REG_ADDR 0x01
38 #define RTC_HR_REG_ADDR 0x02
39 #define RTC_DAY_REG_ADDR 0x03
40 #define RTC_DATE_REG_ADDR 0x04
41 #define RTC_MON_REG_ADDR 0x05
42 #define RTC_YR_REG_ADDR 0x06
44 #define RTC_CTL1_REG_ADDR 0x0e
45 #define RTC_CTL2_REG_ADDR 0x0f
48 * Control register 1 bits
50 #define RTC_CTL1_BIT_2412 0x20
53 * Control register 2 bits
55 #define RTC_CTL2_BIT_PON 0x10
56 #define RTC_CTL2_BIT_VDET 0x40
57 #define RTC_CTL2_BIT_XST 0x20
58 #define RTC_CTL2_BIT_VDSL 0x80
61 * Note: the RX8025 I2C RTC requires register
62 * reads and write to consist of a single bus
63 * cycle. It is not allowed to write the register
64 * address in a first cycle that is terminated by
65 * a STOP condition. The chips needs a 'restart'
66 * sequence (start sequence without a prior stop).
67 * This driver has been written for a 4xx board.
68 * U-Boot's 4xx i2c driver is currently not capable
69 * to generate such cycles to some work arounds
73 /* static uchar rtc_read (uchar reg); */
74 #define rtc_read(reg) buf[((reg) + 1) & 0xf]
76 static void rtc_write (uchar reg
, uchar val
);
79 * Get the current time from the RTC
81 int rtc_get (struct rtc_time
*tmp
)
84 uchar sec
, min
, hour
, mday
, wday
, mon
, year
, ctl2
;
87 if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR
, 0, 0, buf
, 16))
88 printf("Error reading from RTC\n");
90 sec
= rtc_read(RTC_SEC_REG_ADDR
);
91 min
= rtc_read(RTC_MIN_REG_ADDR
);
92 hour
= rtc_read(RTC_HR_REG_ADDR
);
93 wday
= rtc_read(RTC_DAY_REG_ADDR
);
94 mday
= rtc_read(RTC_DATE_REG_ADDR
);
95 mon
= rtc_read(RTC_MON_REG_ADDR
);
96 year
= rtc_read(RTC_YR_REG_ADDR
);
98 DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
99 "hr: %02x min: %02x sec: %02x\n",
100 year
, mon
, mday
, wday
, hour
, min
, sec
);
103 ctl2
= rtc_read(RTC_CTL2_REG_ADDR
);
104 if (ctl2
& RTC_CTL2_BIT_PON
) {
105 printf("RTC: power-on detected\n");
109 if (ctl2
& RTC_CTL2_BIT_VDET
) {
110 printf("RTC: voltage drop detected\n");
114 if (!(ctl2
& RTC_CTL2_BIT_XST
)) {
115 printf("RTC: oscillator stop detected\n");
119 tmp
->tm_sec
= bcd2bin (sec
& 0x7F);
120 tmp
->tm_min
= bcd2bin (min
& 0x7F);
121 if (rtc_read(RTC_CTL1_REG_ADDR
) & RTC_CTL1_BIT_2412
)
122 tmp
->tm_hour
= bcd2bin (hour
& 0x3F);
124 tmp
->tm_hour
= bcd2bin (hour
& 0x1F) % 12 +
125 ((hour
& 0x20) ? 12 : 0);
126 tmp
->tm_mday
= bcd2bin (mday
& 0x3F);
127 tmp
->tm_mon
= bcd2bin (mon
& 0x1F);
128 tmp
->tm_year
= bcd2bin (year
) + ( bcd2bin (year
) >= 70 ? 1900 : 2000);
129 tmp
->tm_wday
= bcd2bin (wday
& 0x07);
133 DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
134 tmp
->tm_year
, tmp
->tm_mon
, tmp
->tm_mday
, tmp
->tm_wday
,
135 tmp
->tm_hour
, tmp
->tm_min
, tmp
->tm_sec
);
143 int rtc_set (struct rtc_time
*tmp
)
145 DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
146 tmp
->tm_year
, tmp
->tm_mon
, tmp
->tm_mday
, tmp
->tm_wday
,
147 tmp
->tm_hour
, tmp
->tm_min
, tmp
->tm_sec
);
149 if (tmp
->tm_year
< 1970 || tmp
->tm_year
> 2069)
150 printf("WARNING: year should be between 1970 and 2069!\n");
152 rtc_write (RTC_YR_REG_ADDR
, bin2bcd (tmp
->tm_year
% 100));
153 rtc_write (RTC_MON_REG_ADDR
, bin2bcd (tmp
->tm_mon
));
154 rtc_write (RTC_DAY_REG_ADDR
, bin2bcd (tmp
->tm_wday
));
155 rtc_write (RTC_DATE_REG_ADDR
, bin2bcd (tmp
->tm_mday
));
156 rtc_write (RTC_HR_REG_ADDR
, bin2bcd (tmp
->tm_hour
));
157 rtc_write (RTC_MIN_REG_ADDR
, bin2bcd (tmp
->tm_min
));
158 rtc_write (RTC_SEC_REG_ADDR
, bin2bcd (tmp
->tm_sec
));
160 rtc_write (RTC_CTL1_REG_ADDR
, RTC_CTL1_BIT_2412
);
166 * Reset the RTC. We setting the date back to 1970-01-01.
168 void rtc_reset (void)
174 if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR
, 0, 0, buf
, 16))
175 printf("Error reading from RTC\n");
177 ctl2
= rtc_read(RTC_CTL2_REG_ADDR
);
178 ctl2
&= ~(RTC_CTL2_BIT_PON
| RTC_CTL2_BIT_VDET
);
179 ctl2
|= RTC_CTL2_BIT_XST
| RTC_CTL2_BIT_VDSL
;
180 rtc_write (RTC_CTL2_REG_ADDR
, ctl2
);
191 printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
192 tmp
.tm_year
, tmp
.tm_mon
, tmp
.tm_mday
,
193 tmp
.tm_hour
, tmp
.tm_min
, tmp
.tm_sec
);
201 static void rtc_write (uchar reg
, uchar val
)
206 if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR
, 0, 0, buf
, 2) != 0)
207 printf("Error writing to RTC\n");
211 #endif /* CONFIG_RTC_RX8025 && CONFIG_CMD_DATE */