ds1307.c (7bee1c91a94db19bd26f92cc67be35d3592c6429) ds1307.c (c79e1c1ce9e5c1ddf6fac631e4741999f8a0cc58)
1/*
2 * (C) Copyright 2001, 2002, 2003
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 * Keith Outwater, keith_outwater@mvis.com`
5 * Steven Scholz, steven.scholz@imc-berlin.de
6 *
7 * SPDX-License-Identifier: GPL-2.0+
8 */

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53
54#define RTC_SEC_BIT_CH 0x80 /* Clock Halt (in Register 0) */
55
56#define RTC_CTL_BIT_RS0 0x01 /* Rate select 0 */
57#define RTC_CTL_BIT_RS1 0x02 /* Rate select 1 */
58#define RTC_CTL_BIT_SQWE 0x10 /* Square Wave Enable */
59#define RTC_CTL_BIT_OUT 0x80 /* Output Control */
60
1/*
2 * (C) Copyright 2001, 2002, 2003
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 * Keith Outwater, keith_outwater@mvis.com`
5 * Steven Scholz, steven.scholz@imc-berlin.de
6 *
7 * SPDX-License-Identifier: GPL-2.0+
8 */

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53
54#define RTC_SEC_BIT_CH 0x80 /* Clock Halt (in Register 0) */
55
56#define RTC_CTL_BIT_RS0 0x01 /* Rate select 0 */
57#define RTC_CTL_BIT_RS1 0x02 /* Rate select 1 */
58#define RTC_CTL_BIT_SQWE 0x10 /* Square Wave Enable */
59#define RTC_CTL_BIT_OUT 0x80 /* Output Control */
60
61/* MCP7941X-specific bits */
62#define MCP7941X_BIT_ST 0x80
63#define MCP7941X_BIT_VBATEN 0x08
64
61static uchar rtc_read (uchar reg);
62static void rtc_write (uchar reg, uchar val);
63
64/*
65 * Get the current time from the RTC
66 */
67int rtc_get (struct rtc_time *tmp)
68{
69 int rel = 0;
70 uchar sec, min, hour, mday, wday, mon, year;
71
65static uchar rtc_read (uchar reg);
66static void rtc_write (uchar reg, uchar val);
67
68/*
69 * Get the current time from the RTC
70 */
71int rtc_get (struct rtc_time *tmp)
72{
73 int rel = 0;
74 uchar sec, min, hour, mday, wday, mon, year;
75
76#ifdef CONFIG_RTC_MCP79411
77read_rtc:
78#endif
72 sec = rtc_read (RTC_SEC_REG_ADDR);
73 min = rtc_read (RTC_MIN_REG_ADDR);
74 hour = rtc_read (RTC_HR_REG_ADDR);
75 wday = rtc_read (RTC_DAY_REG_ADDR);
76 mday = rtc_read (RTC_DATE_REG_ADDR);
77 mon = rtc_read (RTC_MON_REG_ADDR);
78 year = rtc_read (RTC_YR_REG_ADDR);
79
80 DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
81 "hr: %02x min: %02x sec: %02x\n",
82 year, mon, mday, wday, hour, min, sec);
83
79 sec = rtc_read (RTC_SEC_REG_ADDR);
80 min = rtc_read (RTC_MIN_REG_ADDR);
81 hour = rtc_read (RTC_HR_REG_ADDR);
82 wday = rtc_read (RTC_DAY_REG_ADDR);
83 mday = rtc_read (RTC_DATE_REG_ADDR);
84 mon = rtc_read (RTC_MON_REG_ADDR);
85 year = rtc_read (RTC_YR_REG_ADDR);
86
87 DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
88 "hr: %02x min: %02x sec: %02x\n",
89 year, mon, mday, wday, hour, min, sec);
90
91#ifdef CONFIG_RTC_DS1307
84 if (sec & RTC_SEC_BIT_CH) {
85 printf ("### Warning: RTC oscillator has stopped\n");
86 /* clear the CH flag */
87 rtc_write (RTC_SEC_REG_ADDR,
88 rtc_read (RTC_SEC_REG_ADDR) & ~RTC_SEC_BIT_CH);
89 rel = -1;
90 }
92 if (sec & RTC_SEC_BIT_CH) {
93 printf ("### Warning: RTC oscillator has stopped\n");
94 /* clear the CH flag */
95 rtc_write (RTC_SEC_REG_ADDR,
96 rtc_read (RTC_SEC_REG_ADDR) & ~RTC_SEC_BIT_CH);
97 rel = -1;
98 }
99#endif
91
100
101#ifdef CONFIG_RTC_MCP79411
102 /* make sure that the backup battery is enabled */
103 if (!(wday & MCP7941X_BIT_VBATEN)) {
104 rtc_write(RTC_DAY_REG_ADDR,
105 wday | MCP7941X_BIT_VBATEN);
106 }
107
108 /* clock halted? turn it on, so clock can tick. */
109 if (!(sec & MCP7941X_BIT_ST)) {
110 rtc_write(RTC_SEC_REG_ADDR, MCP7941X_BIT_ST);
111 printf("Started RTC\n");
112 goto read_rtc;
113 }
114#endif
115
116
92 tmp->tm_sec = bcd2bin (sec & 0x7F);
93 tmp->tm_min = bcd2bin (min & 0x7F);
94 tmp->tm_hour = bcd2bin (hour & 0x3F);
95 tmp->tm_mday = bcd2bin (mday & 0x3F);
96 tmp->tm_mon = bcd2bin (mon & 0x1F);
97 tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
98 tmp->tm_wday = bcd2bin ((wday - 1) & 0x07);
99 tmp->tm_yday = 0;

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116 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
117 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
118
119 if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
120 printf("WARNING: year should be between 1970 and 2069!\n");
121
122 rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
123 rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
117 tmp->tm_sec = bcd2bin (sec & 0x7F);
118 tmp->tm_min = bcd2bin (min & 0x7F);
119 tmp->tm_hour = bcd2bin (hour & 0x3F);
120 tmp->tm_mday = bcd2bin (mday & 0x3F);
121 tmp->tm_mon = bcd2bin (mon & 0x1F);
122 tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
123 tmp->tm_wday = bcd2bin ((wday - 1) & 0x07);
124 tmp->tm_yday = 0;

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141 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
142 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
143
144 if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
145 printf("WARNING: year should be between 1970 and 2069!\n");
146
147 rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
148 rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
149#ifdef CONFIG_RTC_MCP79411
150 rtc_write (RTC_DAY_REG_ADDR,
151 bin2bcd (tmp->tm_wday + 1) | MCP7941X_BIT_VBATEN);
152#else
124 rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday + 1));
153 rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday + 1));
154#endif
125 rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
126 rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
127 rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
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#ifdef CONFIG_RTC_MCP79411
159 rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec) | MCP7941X_BIT_ST);
160#else
128 rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
161 rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
162#endif
129
130 return 0;
131}
132
133
134/*
135 * Reset the RTC. We setting the date back to 1970-01-01.
136 * We also enable the oscillator output on the SQW/OUT pin and program

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164 return 0;
165}
166
167
168/*
169 * Reset the RTC. We setting the date back to 1970-01-01.
170 * We also enable the oscillator output on the SQW/OUT pin and program

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