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1 | /* |
2 | * Copyright 2001 MontaVista Software Inc. | |
3 | * Author: MontaVista Software, Inc. | |
4 | * ahennessy@mvista.com | |
5 | * | |
6 | * arch/mips/jmr3927/common/rtc_ds1742.c | |
7 | * Based on arch/mips/ddb5xxx/common/rtc_ds1386.c | |
8 | * low-level RTC hookups for s for Dallas 1742 chip. | |
9 | * | |
10 | * Copyright (C) 2000-2001 Toshiba Corporation | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN | |
20 | * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF | |
23 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
24 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | * | |
28 | * You should have received a copy of the GNU General Public License along | |
29 | * with this program; if not, write to the Free Software Foundation, Inc., | |
30 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
31 | */ | |
32 | ||
33 | ||
34 | /* | |
35 | * This file exports a function, rtc_ds1386_init(), which expects an | |
36 | * uncached base address as the argument. It will set the two function | |
37 | * pointers expected by the MIPS generic timer code. | |
38 | */ | |
39 | ||
40 | #include <linux/bcd.h> | |
41 | #include <linux/types.h> | |
42 | #include <linux/time.h> | |
43 | #include <linux/rtc.h> | |
c32cf78c | 44 | #include <linux/ds1742rtc.h> |
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45 | |
46 | #include <asm/time.h> | |
47 | #include <asm/addrspace.h> | |
48 | ||
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49 | #include <asm/debug.h> |
50 | ||
51 | #define EPOCH 2000 | |
52 | ||
53 | static unsigned long rtc_base; | |
54 | ||
55 | static unsigned long | |
56 | rtc_ds1742_get_time(void) | |
57 | { | |
58 | unsigned int year, month, day, hour, minute, second; | |
59 | unsigned int century; | |
53c2df2f | 60 | unsigned long flags; |
1da177e4 | 61 | |
53c2df2f | 62 | spin_lock_irqsave(&rtc_lock, flags); |
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63 | CMOS_WRITE(RTC_READ, RTC_CONTROL); |
64 | second = BCD2BIN(CMOS_READ(RTC_SECONDS) & RTC_SECONDS_MASK); | |
65 | minute = BCD2BIN(CMOS_READ(RTC_MINUTES)); | |
66 | hour = BCD2BIN(CMOS_READ(RTC_HOURS)); | |
67 | day = BCD2BIN(CMOS_READ(RTC_DATE)); | |
68 | month = BCD2BIN(CMOS_READ(RTC_MONTH)); | |
69 | year = BCD2BIN(CMOS_READ(RTC_YEAR)); | |
70 | century = BCD2BIN(CMOS_READ(RTC_CENTURY) & RTC_CENTURY_MASK); | |
71 | CMOS_WRITE(0, RTC_CONTROL); | |
53c2df2f | 72 | spin_unlock_irqrestore(&rtc_lock, flags); |
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73 | |
74 | year += century * 100; | |
75 | ||
76 | return mktime(year, month, day, hour, minute, second); | |
77 | } | |
78 | extern void to_tm(unsigned long tim, struct rtc_time * tm); | |
79 | ||
80 | static int | |
81 | rtc_ds1742_set_time(unsigned long t) | |
82 | { | |
83 | struct rtc_time tm; | |
84 | u8 year, month, day, hour, minute, second; | |
85 | u8 cmos_year, cmos_month, cmos_day, cmos_hour, cmos_minute, cmos_second; | |
86 | int cmos_century; | |
53c2df2f | 87 | unsigned long flags; |
1da177e4 | 88 | |
53c2df2f | 89 | spin_lock_irqsave(&rtc_lock, flags); |
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90 | CMOS_WRITE(RTC_READ, RTC_CONTROL); |
91 | cmos_second = (u8)(CMOS_READ(RTC_SECONDS) & RTC_SECONDS_MASK); | |
92 | cmos_minute = (u8)CMOS_READ(RTC_MINUTES); | |
93 | cmos_hour = (u8)CMOS_READ(RTC_HOURS); | |
94 | cmos_day = (u8)CMOS_READ(RTC_DATE); | |
95 | cmos_month = (u8)CMOS_READ(RTC_MONTH); | |
96 | cmos_year = (u8)CMOS_READ(RTC_YEAR); | |
97 | cmos_century = CMOS_READ(RTC_CENTURY) & RTC_CENTURY_MASK; | |
98 | ||
99 | CMOS_WRITE(RTC_WRITE, RTC_CONTROL); | |
100 | ||
101 | /* convert */ | |
102 | to_tm(t, &tm); | |
103 | ||
104 | /* check each field one by one */ | |
105 | year = BIN2BCD(tm.tm_year - EPOCH); | |
106 | if (year != cmos_year) { | |
107 | CMOS_WRITE(year,RTC_YEAR); | |
108 | } | |
109 | ||
110 | month = BIN2BCD(tm.tm_mon); | |
111 | if (month != (cmos_month & 0x1f)) { | |
112 | CMOS_WRITE((month & 0x1f) | (cmos_month & ~0x1f),RTC_MONTH); | |
113 | } | |
114 | ||
115 | day = BIN2BCD(tm.tm_mday); | |
116 | if (day != cmos_day) { | |
117 | ||
118 | CMOS_WRITE(day, RTC_DATE); | |
119 | } | |
120 | ||
121 | if (cmos_hour & 0x40) { | |
122 | /* 12 hour format */ | |
123 | hour = 0x40; | |
124 | if (tm.tm_hour > 12) { | |
125 | hour |= 0x20 | (BIN2BCD(hour-12) & 0x1f); | |
126 | } else { | |
127 | hour |= BIN2BCD(tm.tm_hour); | |
128 | } | |
129 | } else { | |
130 | /* 24 hour format */ | |
131 | hour = BIN2BCD(tm.tm_hour) & 0x3f; | |
132 | } | |
133 | if (hour != cmos_hour) CMOS_WRITE(hour, RTC_HOURS); | |
134 | ||
135 | minute = BIN2BCD(tm.tm_min); | |
136 | if (minute != cmos_minute) { | |
137 | CMOS_WRITE(minute, RTC_MINUTES); | |
138 | } | |
139 | ||
140 | second = BIN2BCD(tm.tm_sec); | |
141 | if (second != cmos_second) { | |
142 | CMOS_WRITE(second & RTC_SECONDS_MASK,RTC_SECONDS); | |
143 | } | |
144 | ||
145 | /* RTC_CENTURY and RTC_CONTROL share same address... */ | |
146 | CMOS_WRITE(cmos_century, RTC_CONTROL); | |
53c2df2f | 147 | spin_unlock_irqrestore(&rtc_lock, flags); |
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148 | |
149 | return 0; | |
150 | } | |
151 | ||
152 | void | |
153 | rtc_ds1742_init(unsigned long base) | |
154 | { | |
155 | u8 cmos_second; | |
156 | ||
157 | /* remember the base */ | |
158 | rtc_base = base; | |
159 | db_assert((rtc_base & 0xe0000000) == KSEG1); | |
160 | ||
161 | /* set the function pointers */ | |
d23ee8fe YY |
162 | rtc_mips_get_time = rtc_ds1742_get_time; |
163 | rtc_mips_set_time = rtc_ds1742_set_time; | |
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164 | |
165 | /* clear oscillator stop bit */ | |
166 | CMOS_WRITE(RTC_READ, RTC_CONTROL); | |
167 | cmos_second = (u8)(CMOS_READ(RTC_SECONDS) & RTC_SECONDS_MASK); | |
168 | CMOS_WRITE(RTC_WRITE, RTC_CONTROL); | |
169 | CMOS_WRITE(cmos_second, RTC_SECONDS); /* clear msb */ | |
170 | CMOS_WRITE(0, RTC_CONTROL); | |
171 | } |