Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
f30c2269 | 2 | * include/asm-generic/rtc.h |
1da177e4 LT |
3 | * |
4 | * Author: Tom Rini <trini@mvista.com> | |
5 | * | |
6 | * Based on: | |
7 | * drivers/char/rtc.c | |
8 | * | |
9 | * Please read the COPYING file for all license details. | |
10 | */ | |
11 | ||
12 | #ifndef __ASM_RTC_H__ | |
13 | #define __ASM_RTC_H__ | |
14 | ||
1da177e4 LT |
15 | #include <linux/mc146818rtc.h> |
16 | #include <linux/rtc.h> | |
17 | #include <linux/bcd.h> | |
38c052f8 | 18 | #include <linux/delay.h> |
1da177e4 LT |
19 | |
20 | #define RTC_PIE 0x40 /* periodic interrupt enable */ | |
21 | #define RTC_AIE 0x20 /* alarm interrupt enable */ | |
22 | #define RTC_UIE 0x10 /* update-finished interrupt enable */ | |
23 | ||
24 | /* some dummy definitions */ | |
25 | #define RTC_BATT_BAD 0x100 /* battery bad */ | |
26 | #define RTC_SQWE 0x08 /* enable square-wave output */ | |
27 | #define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */ | |
28 | #define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */ | |
29 | #define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */ | |
30 | ||
31 | /* | |
32 | * Returns true if a clock update is in progress | |
33 | */ | |
34 | static inline unsigned char rtc_is_updating(void) | |
35 | { | |
36 | unsigned char uip; | |
795d45b2 | 37 | unsigned long flags; |
1da177e4 | 38 | |
795d45b2 | 39 | spin_lock_irqsave(&rtc_lock, flags); |
1da177e4 | 40 | uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP); |
795d45b2 | 41 | spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4 LT |
42 | return uip; |
43 | } | |
44 | ||
5f7dc5d7 | 45 | static inline unsigned int __get_rtc_time(struct rtc_time *time) |
1da177e4 | 46 | { |
1da177e4 | 47 | unsigned char ctrl; |
795d45b2 AM |
48 | unsigned long flags; |
49 | ||
1da177e4 LT |
50 | #ifdef CONFIG_MACH_DECSTATION |
51 | unsigned int real_year; | |
52 | #endif | |
53 | ||
54 | /* | |
55 | * read RTC once any update in progress is done. The update | |
38c052f8 | 56 | * can take just over 2ms. We wait 20ms. There is no need to |
1da177e4 LT |
57 | * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. |
58 | * If you need to know *exactly* when a second has started, enable | |
59 | * periodic update complete interrupts, (via ioctl) and then | |
60 | * immediately read /dev/rtc which will block until you get the IRQ. | |
61 | * Once the read clears, read the RTC time (again via ioctl). Easy. | |
62 | */ | |
38c052f8 IM |
63 | if (rtc_is_updating()) |
64 | mdelay(20); | |
1da177e4 LT |
65 | |
66 | /* | |
67 | * Only the values that we read from the RTC are set. We leave | |
68 | * tm_wday, tm_yday and tm_isdst untouched. Even though the | |
69 | * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated | |
70 | * by the RTC when initially set to a non-zero value. | |
71 | */ | |
795d45b2 | 72 | spin_lock_irqsave(&rtc_lock, flags); |
1da177e4 LT |
73 | time->tm_sec = CMOS_READ(RTC_SECONDS); |
74 | time->tm_min = CMOS_READ(RTC_MINUTES); | |
75 | time->tm_hour = CMOS_READ(RTC_HOURS); | |
76 | time->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH); | |
77 | time->tm_mon = CMOS_READ(RTC_MONTH); | |
78 | time->tm_year = CMOS_READ(RTC_YEAR); | |
79 | #ifdef CONFIG_MACH_DECSTATION | |
80 | real_year = CMOS_READ(RTC_DEC_YEAR); | |
81 | #endif | |
82 | ctrl = CMOS_READ(RTC_CONTROL); | |
795d45b2 | 83 | spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4 LT |
84 | |
85 | if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) | |
86 | { | |
357c6e63 AB |
87 | time->tm_sec = bcd2bin(time->tm_sec); |
88 | time->tm_min = bcd2bin(time->tm_min); | |
89 | time->tm_hour = bcd2bin(time->tm_hour); | |
90 | time->tm_mday = bcd2bin(time->tm_mday); | |
91 | time->tm_mon = bcd2bin(time->tm_mon); | |
92 | time->tm_year = bcd2bin(time->tm_year); | |
1da177e4 LT |
93 | } |
94 | ||
95 | #ifdef CONFIG_MACH_DECSTATION | |
96 | time->tm_year += real_year - 72; | |
97 | #endif | |
98 | ||
99 | /* | |
100 | * Account for differences between how the RTC uses the values | |
101 | * and how they are defined in a struct rtc_time; | |
102 | */ | |
103 | if (time->tm_year <= 69) | |
104 | time->tm_year += 100; | |
105 | ||
106 | time->tm_mon--; | |
107 | ||
108 | return RTC_24H; | |
109 | } | |
110 | ||
5f7dc5d7 IK |
111 | #ifndef get_rtc_time |
112 | #define get_rtc_time __get_rtc_time | |
113 | #endif | |
114 | ||
1da177e4 | 115 | /* Set the current date and time in the real time clock. */ |
5f7dc5d7 | 116 | static inline int __set_rtc_time(struct rtc_time *time) |
1da177e4 | 117 | { |
eb71c87a | 118 | unsigned long flags; |
1da177e4 LT |
119 | unsigned char mon, day, hrs, min, sec; |
120 | unsigned char save_control, save_freq_select; | |
121 | unsigned int yrs; | |
122 | #ifdef CONFIG_MACH_DECSTATION | |
123 | unsigned int real_yrs, leap_yr; | |
124 | #endif | |
125 | ||
126 | yrs = time->tm_year; | |
127 | mon = time->tm_mon + 1; /* tm_mon starts at zero */ | |
128 | day = time->tm_mday; | |
129 | hrs = time->tm_hour; | |
130 | min = time->tm_min; | |
131 | sec = time->tm_sec; | |
132 | ||
133 | if (yrs > 255) /* They are unsigned */ | |
134 | return -EINVAL; | |
135 | ||
eb71c87a | 136 | spin_lock_irqsave(&rtc_lock, flags); |
1da177e4 LT |
137 | #ifdef CONFIG_MACH_DECSTATION |
138 | real_yrs = yrs; | |
139 | leap_yr = ((!((yrs + 1900) % 4) && ((yrs + 1900) % 100)) || | |
140 | !((yrs + 1900) % 400)); | |
141 | yrs = 72; | |
142 | ||
143 | /* | |
144 | * We want to keep the year set to 73 until March | |
145 | * for non-leap years, so that Feb, 29th is handled | |
146 | * correctly. | |
147 | */ | |
148 | if (!leap_yr && mon < 3) { | |
149 | real_yrs--; | |
150 | yrs = 73; | |
151 | } | |
152 | #endif | |
153 | /* These limits and adjustments are independent of | |
154 | * whether the chip is in binary mode or not. | |
155 | */ | |
156 | if (yrs > 169) { | |
eb71c87a | 157 | spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4 LT |
158 | return -EINVAL; |
159 | } | |
160 | ||
161 | if (yrs >= 100) | |
162 | yrs -= 100; | |
163 | ||
164 | if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) | |
165 | || RTC_ALWAYS_BCD) { | |
357c6e63 AB |
166 | sec = bin2bcd(sec); |
167 | min = bin2bcd(min); | |
168 | hrs = bin2bcd(hrs); | |
169 | day = bin2bcd(day); | |
170 | mon = bin2bcd(mon); | |
171 | yrs = bin2bcd(yrs); | |
1da177e4 LT |
172 | } |
173 | ||
174 | save_control = CMOS_READ(RTC_CONTROL); | |
175 | CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL); | |
176 | save_freq_select = CMOS_READ(RTC_FREQ_SELECT); | |
177 | CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); | |
178 | ||
179 | #ifdef CONFIG_MACH_DECSTATION | |
180 | CMOS_WRITE(real_yrs, RTC_DEC_YEAR); | |
181 | #endif | |
182 | CMOS_WRITE(yrs, RTC_YEAR); | |
183 | CMOS_WRITE(mon, RTC_MONTH); | |
184 | CMOS_WRITE(day, RTC_DAY_OF_MONTH); | |
185 | CMOS_WRITE(hrs, RTC_HOURS); | |
186 | CMOS_WRITE(min, RTC_MINUTES); | |
187 | CMOS_WRITE(sec, RTC_SECONDS); | |
188 | ||
189 | CMOS_WRITE(save_control, RTC_CONTROL); | |
190 | CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT); | |
191 | ||
eb71c87a | 192 | spin_unlock_irqrestore(&rtc_lock, flags); |
1da177e4 LT |
193 | |
194 | return 0; | |
195 | } | |
196 | ||
5f7dc5d7 IK |
197 | #ifndef set_rtc_time |
198 | #define set_rtc_time __set_rtc_time | |
199 | #endif | |
200 | ||
1da177e4 LT |
201 | static inline unsigned int get_rtc_ss(void) |
202 | { | |
203 | struct rtc_time h; | |
204 | ||
3aef3928 | 205 | get_rtc_time(&h); |
1da177e4 LT |
206 | return h.tm_sec; |
207 | } | |
208 | ||
209 | static inline int get_rtc_pll(struct rtc_pll_info *pll) | |
210 | { | |
211 | return -EINVAL; | |
212 | } | |
213 | static inline int set_rtc_pll(struct rtc_pll_info *pll) | |
214 | { | |
215 | return -EINVAL; | |
216 | } | |
217 | ||
1da177e4 | 218 | #endif /* __ASM_RTC_H__ */ |