1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
4 * Andreas Heppel <aheppel@sysgo.de>
5 */
6
7 /*
8 * Date & Time support for the MK48T59 RTC
9 */
10
11 #undef RTC_DEBUG
12
13 #include <common.h>
14 #include <command.h>
15 #include <config.h>
16 #include <rtc.h>
17 #include <mk48t59.h>
18
19 #if defined(CONFIG_BAB7xx)
20
rtc_read(short reg)21 static uchar rtc_read (short reg)
22 {
23 out8(RTC_PORT_ADDR0, reg & 0xFF);
24 out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF);
25 return in8(RTC_PORT_DATA);
26 }
27
rtc_write(short reg,uchar val)28 static void rtc_write (short reg, uchar val)
29 {
30 out8(RTC_PORT_ADDR0, reg & 0xFF);
31 out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF);
32 out8(RTC_PORT_DATA, val);
33 }
34
35 #elif defined(CONFIG_EVAL5200)
36
rtc_read(short reg)37 static uchar rtc_read (short reg)
38 {
39 return in8(RTC(reg));
40 }
41
rtc_write(short reg,uchar val)42 static void rtc_write (short reg, uchar val)
43 {
44 out8(RTC(reg),val);
45 }
46
47 #else
48 # error Board specific rtc access functions should be supplied
49 #endif
50
51 /* ------------------------------------------------------------------------- */
52
nvram_read(void * dest,const short src,size_t count)53 void *nvram_read(void *dest, const short src, size_t count)
54 {
55 uchar *d = (uchar *) dest;
56 short s = src;
57
58 while (count--)
59 *d++ = rtc_read(s++);
60
61 return dest;
62 }
63
nvram_write(short dest,const void * src,size_t count)64 void nvram_write(short dest, const void *src, size_t count)
65 {
66 short d = dest;
67 uchar *s = (uchar *) src;
68
69 while (count--)
70 rtc_write(d++, *s++);
71 }
72
73 #if defined(CONFIG_CMD_DATE)
74
75 /* ------------------------------------------------------------------------- */
76
rtc_get(struct rtc_time * tmp)77 int rtc_get (struct rtc_time *tmp)
78 {
79 uchar save_ctrl_a;
80 uchar sec, min, hour, mday, wday, mon, year;
81
82 /* Simple: freeze the clock, read it and allow updates again */
83 save_ctrl_a = rtc_read(RTC_CONTROLA);
84
85 /* Set the register to read the value. */
86 save_ctrl_a |= RTC_CA_READ;
87 rtc_write(RTC_CONTROLA, save_ctrl_a);
88
89 sec = rtc_read (RTC_SECONDS);
90 min = rtc_read (RTC_MINUTES);
91 hour = rtc_read (RTC_HOURS);
92 mday = rtc_read (RTC_DAY_OF_MONTH);
93 wday = rtc_read (RTC_DAY_OF_WEEK);
94 mon = rtc_read (RTC_MONTH);
95 year = rtc_read (RTC_YEAR);
96
97 /* re-enable update */
98 save_ctrl_a &= ~RTC_CA_READ;
99 rtc_write(RTC_CONTROLA, save_ctrl_a);
100
101 #ifdef RTC_DEBUG
102 printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
103 "hr: %02x min: %02x sec: %02x\n",
104 year, mon, mday, wday,
105 hour, min, sec );
106 #endif
107 tmp->tm_sec = bcd2bin (sec & 0x7F);
108 tmp->tm_min = bcd2bin (min & 0x7F);
109 tmp->tm_hour = bcd2bin (hour & 0x3F);
110 tmp->tm_mday = bcd2bin (mday & 0x3F);
111 tmp->tm_mon = bcd2bin (mon & 0x1F);
112 tmp->tm_year = bcd2bin (year);
113 tmp->tm_wday = bcd2bin (wday & 0x07);
114 if(tmp->tm_year<70)
115 tmp->tm_year+=2000;
116 else
117 tmp->tm_year+=1900;
118 tmp->tm_yday = 0;
119 tmp->tm_isdst= 0;
120 #ifdef RTC_DEBUG
121 printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
122 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
123 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
124 #endif
125
126 return 0;
127 }
128
rtc_set(struct rtc_time * tmp)129 int rtc_set (struct rtc_time *tmp)
130 {
131 uchar save_ctrl_a;
132
133 #ifdef RTC_DEBUG
134 printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
135 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
136 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
137 #endif
138 save_ctrl_a = rtc_read(RTC_CONTROLA);
139
140 save_ctrl_a |= RTC_CA_WRITE;
141 rtc_write(RTC_CONTROLA, save_ctrl_a); /* disables the RTC to update the regs */
142
143 rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100));
144 rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon));
145
146 rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday));
147 rtc_write (RTC_DAY_OF_MONTH, bin2bcd(tmp->tm_mday));
148 rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour));
149 rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min ));
150 rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec ));
151
152 save_ctrl_a &= ~RTC_CA_WRITE;
153 rtc_write(RTC_CONTROLA, save_ctrl_a); /* enables the RTC to update the regs */
154
155 return 0;
156 }
157
rtc_reset(void)158 void rtc_reset (void)
159 {
160 uchar control_b;
161
162 /*
163 * Start oscillator here.
164 */
165 control_b = rtc_read(RTC_CONTROLB);
166
167 control_b &= ~RTC_CB_STOP;
168 rtc_write(RTC_CONTROLB, control_b);
169 }
170
rtc_set_watchdog(short multi,short res)171 void rtc_set_watchdog(short multi, short res)
172 {
173 uchar wd_value;
174
175 wd_value = RTC_WDS | ((multi & 0x1F) << 2) | (res & 0x3);
176 rtc_write(RTC_WATCHDOG, wd_value);
177 }
178
179 #endif
180