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1da177e4 LT |
1 | /* |
2 | * linux/arch/m68k/atari/time.c | |
3 | * | |
4 | * Atari time and real time clock stuff | |
5 | * | |
6 | * Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek | |
7 | * | |
8 | * This file is subject to the terms and conditions of the GNU General Public | |
9 | * License. See the file COPYING in the main directory of this archive | |
10 | * for more details. | |
11 | */ | |
12 | ||
13 | #include <linux/types.h> | |
14 | #include <linux/mc146818rtc.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/rtc.h> | |
18 | #include <linux/bcd.h> | |
69961c37 | 19 | #include <linux/delay.h> |
12799fe4 | 20 | #include <linux/export.h> |
1da177e4 LT |
21 | |
22 | #include <asm/atariints.h> | |
23 | ||
7ae4833a GU |
24 | DEFINE_SPINLOCK(rtc_lock); |
25 | EXPORT_SYMBOL_GPL(rtc_lock); | |
26 | ||
1da177e4 | 27 | void __init |
40220c1a | 28 | atari_sched_init(irq_handler_t timer_routine) |
1da177e4 LT |
29 | { |
30 | /* set Timer C data Register */ | |
3d92e8f3 | 31 | st_mfp.tim_dt_c = INT_TICKS; |
1da177e4 | 32 | /* start timer C, div = 1:100 */ |
3d92e8f3 | 33 | st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 15) | 0x60; |
1da177e4 | 34 | /* install interrupt service routine for MFP Timer C */ |
87511d09 | 35 | if (request_irq(IRQ_MFP_TIMC, timer_routine, 0, "timer", timer_routine)) |
5b8b4c3d | 36 | pr_err("Couldn't register timer interrupt\n"); |
1da177e4 LT |
37 | } |
38 | ||
39 | /* ++andreas: gettimeoffset fixed to check for pending interrupt */ | |
40 | ||
41 | #define TICK_SIZE 10000 | |
42 | ||
43 | /* This is always executed with interrupts disabled. */ | |
c8d5ba18 | 44 | u32 atari_gettimeoffset(void) |
1da177e4 | 45 | { |
c8d5ba18 | 46 | u32 ticks, offset = 0; |
1da177e4 LT |
47 | |
48 | /* read MFP timer C current value */ | |
3d92e8f3 | 49 | ticks = st_mfp.tim_dt_c; |
1da177e4 LT |
50 | /* The probability of underflow is less than 2% */ |
51 | if (ticks > INT_TICKS - INT_TICKS / 50) | |
52 | /* Check for pending timer interrupt */ | |
3d92e8f3 | 53 | if (st_mfp.int_pn_b & (1 << 5)) |
1da177e4 LT |
54 | offset = TICK_SIZE; |
55 | ||
56 | ticks = INT_TICKS - ticks; | |
57 | ticks = ticks * 10000L / INT_TICKS; | |
58 | ||
c8d5ba18 | 59 | return (ticks + offset) * 1000; |
1da177e4 LT |
60 | } |
61 | ||
62 | ||
63 | static void mste_read(struct MSTE_RTC *val) | |
64 | { | |
65 | #define COPY(v) val->v=(mste_rtc.v & 0xf) | |
66 | do { | |
67 | COPY(sec_ones) ; COPY(sec_tens) ; COPY(min_ones) ; | |
68 | COPY(min_tens) ; COPY(hr_ones) ; COPY(hr_tens) ; | |
69 | COPY(weekday) ; COPY(day_ones) ; COPY(day_tens) ; | |
70 | COPY(mon_ones) ; COPY(mon_tens) ; COPY(year_ones) ; | |
71 | COPY(year_tens) ; | |
72 | /* prevent from reading the clock while it changed */ | |
73 | } while (val->sec_ones != (mste_rtc.sec_ones & 0xf)); | |
74 | #undef COPY | |
75 | } | |
76 | ||
77 | static void mste_write(struct MSTE_RTC *val) | |
78 | { | |
79 | #define COPY(v) mste_rtc.v=val->v | |
80 | do { | |
81 | COPY(sec_ones) ; COPY(sec_tens) ; COPY(min_ones) ; | |
82 | COPY(min_tens) ; COPY(hr_ones) ; COPY(hr_tens) ; | |
83 | COPY(weekday) ; COPY(day_ones) ; COPY(day_tens) ; | |
84 | COPY(mon_ones) ; COPY(mon_tens) ; COPY(year_ones) ; | |
85 | COPY(year_tens) ; | |
86 | /* prevent from writing the clock while it changed */ | |
87 | } while (val->sec_ones != (mste_rtc.sec_ones & 0xf)); | |
88 | #undef COPY | |
89 | } | |
90 | ||
91 | #define RTC_READ(reg) \ | |
92 | ({ unsigned char __val; \ | |
93 | (void) atari_writeb(reg,&tt_rtc.regsel); \ | |
94 | __val = tt_rtc.data; \ | |
95 | __val; \ | |
96 | }) | |
97 | ||
98 | #define RTC_WRITE(reg,val) \ | |
99 | do { \ | |
100 | atari_writeb(reg,&tt_rtc.regsel); \ | |
101 | tt_rtc.data = (val); \ | |
102 | } while(0) | |
103 | ||
104 | ||
105 | #define HWCLK_POLL_INTERVAL 5 | |
106 | ||
107 | int atari_mste_hwclk( int op, struct rtc_time *t ) | |
108 | { | |
109 | int hour, year; | |
110 | int hr24=0; | |
111 | struct MSTE_RTC val; | |
112 | ||
113 | mste_rtc.mode=(mste_rtc.mode | 1); | |
114 | hr24=mste_rtc.mon_tens & 1; | |
115 | mste_rtc.mode=(mste_rtc.mode & ~1); | |
116 | ||
117 | if (op) { | |
118 | /* write: prepare values */ | |
119 | ||
120 | val.sec_ones = t->tm_sec % 10; | |
121 | val.sec_tens = t->tm_sec / 10; | |
122 | val.min_ones = t->tm_min % 10; | |
123 | val.min_tens = t->tm_min / 10; | |
124 | hour = t->tm_hour; | |
125 | if (!hr24) { | |
126 | if (hour > 11) | |
127 | hour += 20 - 12; | |
128 | if (hour == 0 || hour == 20) | |
129 | hour += 12; | |
130 | } | |
131 | val.hr_ones = hour % 10; | |
132 | val.hr_tens = hour / 10; | |
133 | val.day_ones = t->tm_mday % 10; | |
134 | val.day_tens = t->tm_mday / 10; | |
135 | val.mon_ones = (t->tm_mon+1) % 10; | |
136 | val.mon_tens = (t->tm_mon+1) / 10; | |
137 | year = t->tm_year - 80; | |
138 | val.year_ones = year % 10; | |
139 | val.year_tens = year / 10; | |
140 | val.weekday = t->tm_wday; | |
141 | mste_write(&val); | |
142 | mste_rtc.mode=(mste_rtc.mode | 1); | |
143 | val.year_ones = (year % 4); /* leap year register */ | |
144 | mste_rtc.mode=(mste_rtc.mode & ~1); | |
145 | } | |
146 | else { | |
147 | mste_read(&val); | |
148 | t->tm_sec = val.sec_ones + val.sec_tens * 10; | |
149 | t->tm_min = val.min_ones + val.min_tens * 10; | |
150 | hour = val.hr_ones + val.hr_tens * 10; | |
151 | if (!hr24) { | |
152 | if (hour == 12 || hour == 12 + 20) | |
153 | hour -= 12; | |
154 | if (hour >= 20) | |
155 | hour += 12 - 20; | |
156 | } | |
157 | t->tm_hour = hour; | |
158 | t->tm_mday = val.day_ones + val.day_tens * 10; | |
159 | t->tm_mon = val.mon_ones + val.mon_tens * 10 - 1; | |
160 | t->tm_year = val.year_ones + val.year_tens * 10 + 80; | |
161 | t->tm_wday = val.weekday; | |
162 | } | |
163 | return 0; | |
164 | } | |
165 | ||
166 | int atari_tt_hwclk( int op, struct rtc_time *t ) | |
167 | { | |
168 | int sec=0, min=0, hour=0, day=0, mon=0, year=0, wday=0; | |
169 | unsigned long flags; | |
170 | unsigned char ctrl; | |
171 | int pm = 0; | |
172 | ||
173 | ctrl = RTC_READ(RTC_CONTROL); /* control registers are | |
174 | * independent from the UIP */ | |
175 | ||
176 | if (op) { | |
177 | /* write: prepare values */ | |
178 | ||
179 | sec = t->tm_sec; | |
180 | min = t->tm_min; | |
181 | hour = t->tm_hour; | |
182 | day = t->tm_mday; | |
183 | mon = t->tm_mon + 1; | |
184 | year = t->tm_year - atari_rtc_year_offset; | |
185 | wday = t->tm_wday + (t->tm_wday >= 0); | |
186 | ||
187 | if (!(ctrl & RTC_24H)) { | |
188 | if (hour > 11) { | |
189 | pm = 0x80; | |
190 | if (hour != 12) | |
191 | hour -= 12; | |
192 | } | |
193 | else if (hour == 0) | |
194 | hour = 12; | |
195 | } | |
196 | ||
197 | if (!(ctrl & RTC_DM_BINARY)) { | |
5b1d5f95 AB |
198 | sec = bin2bcd(sec); |
199 | min = bin2bcd(min); | |
200 | hour = bin2bcd(hour); | |
201 | day = bin2bcd(day); | |
202 | mon = bin2bcd(mon); | |
203 | year = bin2bcd(year); | |
204 | if (wday >= 0) | |
205 | wday = bin2bcd(wday); | |
1da177e4 LT |
206 | } |
207 | } | |
208 | ||
209 | /* Reading/writing the clock registers is a bit critical due to | |
210 | * the regular update cycle of the RTC. While an update is in | |
211 | * progress, registers 0..9 shouldn't be touched. | |
212 | * The problem is solved like that: If an update is currently in | |
213 | * progress (the UIP bit is set), the process sleeps for a while | |
214 | * (50ms). This really should be enough, since the update cycle | |
215 | * normally needs 2 ms. | |
216 | * If the UIP bit reads as 0, we have at least 244 usecs until the | |
217 | * update starts. This should be enough... But to be sure, | |
218 | * additionally the RTC_SET bit is set to prevent an update cycle. | |
219 | */ | |
220 | ||
69961c37 GU |
221 | while( RTC_READ(RTC_FREQ_SELECT) & RTC_UIP ) { |
222 | if (in_atomic() || irqs_disabled()) | |
223 | mdelay(1); | |
224 | else | |
225 | schedule_timeout_interruptible(HWCLK_POLL_INTERVAL); | |
226 | } | |
1da177e4 LT |
227 | |
228 | local_irq_save(flags); | |
229 | RTC_WRITE( RTC_CONTROL, ctrl | RTC_SET ); | |
230 | if (!op) { | |
231 | sec = RTC_READ( RTC_SECONDS ); | |
232 | min = RTC_READ( RTC_MINUTES ); | |
233 | hour = RTC_READ( RTC_HOURS ); | |
234 | day = RTC_READ( RTC_DAY_OF_MONTH ); | |
235 | mon = RTC_READ( RTC_MONTH ); | |
236 | year = RTC_READ( RTC_YEAR ); | |
237 | wday = RTC_READ( RTC_DAY_OF_WEEK ); | |
238 | } | |
239 | else { | |
240 | RTC_WRITE( RTC_SECONDS, sec ); | |
241 | RTC_WRITE( RTC_MINUTES, min ); | |
242 | RTC_WRITE( RTC_HOURS, hour + pm); | |
243 | RTC_WRITE( RTC_DAY_OF_MONTH, day ); | |
244 | RTC_WRITE( RTC_MONTH, mon ); | |
245 | RTC_WRITE( RTC_YEAR, year ); | |
246 | if (wday >= 0) RTC_WRITE( RTC_DAY_OF_WEEK, wday ); | |
247 | } | |
248 | RTC_WRITE( RTC_CONTROL, ctrl & ~RTC_SET ); | |
249 | local_irq_restore(flags); | |
250 | ||
251 | if (!op) { | |
252 | /* read: adjust values */ | |
253 | ||
254 | if (hour & 0x80) { | |
255 | hour &= ~0x80; | |
256 | pm = 1; | |
257 | } | |
258 | ||
259 | if (!(ctrl & RTC_DM_BINARY)) { | |
5b1d5f95 AB |
260 | sec = bcd2bin(sec); |
261 | min = bcd2bin(min); | |
262 | hour = bcd2bin(hour); | |
263 | day = bcd2bin(day); | |
264 | mon = bcd2bin(mon); | |
265 | year = bcd2bin(year); | |
266 | wday = bcd2bin(wday); | |
1da177e4 LT |
267 | } |
268 | ||
269 | if (!(ctrl & RTC_24H)) { | |
270 | if (!pm && hour == 12) | |
271 | hour = 0; | |
272 | else if (pm && hour != 12) | |
273 | hour += 12; | |
274 | } | |
275 | ||
276 | t->tm_sec = sec; | |
277 | t->tm_min = min; | |
278 | t->tm_hour = hour; | |
279 | t->tm_mday = day; | |
280 | t->tm_mon = mon - 1; | |
281 | t->tm_year = year + atari_rtc_year_offset; | |
282 | t->tm_wday = wday - 1; | |
283 | } | |
284 | ||
285 | return( 0 ); | |
286 | } | |
287 | ||
288 | ||
289 | int atari_mste_set_clock_mmss (unsigned long nowtime) | |
290 | { | |
291 | short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60; | |
292 | struct MSTE_RTC val; | |
293 | unsigned char rtc_minutes; | |
294 | ||
295 | mste_read(&val); | |
296 | rtc_minutes= val.min_ones + val.min_tens * 10; | |
297 | if ((rtc_minutes < real_minutes | |
298 | ? real_minutes - rtc_minutes | |
299 | : rtc_minutes - real_minutes) < 30) | |
300 | { | |
301 | val.sec_ones = real_seconds % 10; | |
302 | val.sec_tens = real_seconds / 10; | |
303 | val.min_ones = real_minutes % 10; | |
304 | val.min_tens = real_minutes / 10; | |
305 | mste_write(&val); | |
306 | } | |
307 | else | |
308 | return -1; | |
309 | return 0; | |
310 | } | |
311 | ||
312 | int atari_tt_set_clock_mmss (unsigned long nowtime) | |
313 | { | |
314 | int retval = 0; | |
315 | short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60; | |
316 | unsigned char save_control, save_freq_select, rtc_minutes; | |
317 | ||
318 | save_control = RTC_READ (RTC_CONTROL); /* tell the clock it's being set */ | |
319 | RTC_WRITE (RTC_CONTROL, save_control | RTC_SET); | |
320 | ||
321 | save_freq_select = RTC_READ (RTC_FREQ_SELECT); /* stop and reset prescaler */ | |
322 | RTC_WRITE (RTC_FREQ_SELECT, save_freq_select | RTC_DIV_RESET2); | |
323 | ||
324 | rtc_minutes = RTC_READ (RTC_MINUTES); | |
325 | if (!(save_control & RTC_DM_BINARY)) | |
5b1d5f95 | 326 | rtc_minutes = bcd2bin(rtc_minutes); |
1da177e4 LT |
327 | |
328 | /* Since we're only adjusting minutes and seconds, don't interfere | |
329 | with hour overflow. This avoids messing with unknown time zones | |
330 | but requires your RTC not to be off by more than 30 minutes. */ | |
331 | if ((rtc_minutes < real_minutes | |
332 | ? real_minutes - rtc_minutes | |
333 | : rtc_minutes - real_minutes) < 30) | |
334 | { | |
335 | if (!(save_control & RTC_DM_BINARY)) | |
336 | { | |
5b1d5f95 AB |
337 | real_seconds = bin2bcd(real_seconds); |
338 | real_minutes = bin2bcd(real_minutes); | |
1da177e4 LT |
339 | } |
340 | RTC_WRITE (RTC_SECONDS, real_seconds); | |
341 | RTC_WRITE (RTC_MINUTES, real_minutes); | |
342 | } | |
343 | else | |
344 | retval = -1; | |
345 | ||
346 | RTC_WRITE (RTC_FREQ_SELECT, save_freq_select); | |
347 | RTC_WRITE (RTC_CONTROL, save_control); | |
348 | return retval; | |
349 | } | |
350 | ||
351 | /* | |
352 | * Local variables: | |
353 | * c-indent-level: 4 | |
354 | * tab-width: 8 | |
355 | * End: | |
356 | */ |