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346 lines
9.6 KiB
346 lines
9.6 KiB
/*
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* linux/arch/m68k/atari/time.c
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*
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* Atari time and real time clock stuff
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*
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* Assembled of parts of former atari/config.c 97-12-18 by Roman Hodek
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/types.h>
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#include <linux/mc146818rtc.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <asm/atariints.h>
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void __init
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atari_sched_init(irqreturn_t (*timer_routine)(int, void *, struct pt_regs *))
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{
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/* set Timer C data Register */
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mfp.tim_dt_c = INT_TICKS;
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/* start timer C, div = 1:100 */
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mfp.tim_ct_cd = (mfp.tim_ct_cd & 15) | 0x60;
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/* install interrupt service routine for MFP Timer C */
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request_irq(IRQ_MFP_TIMC, timer_routine, IRQ_TYPE_SLOW,
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"timer", timer_routine);
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}
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/* ++andreas: gettimeoffset fixed to check for pending interrupt */
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#define TICK_SIZE 10000
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/* This is always executed with interrupts disabled. */
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unsigned long atari_gettimeoffset (void)
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{
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unsigned long ticks, offset = 0;
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/* read MFP timer C current value */
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ticks = mfp.tim_dt_c;
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/* The probability of underflow is less than 2% */
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if (ticks > INT_TICKS - INT_TICKS / 50)
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/* Check for pending timer interrupt */
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if (mfp.int_pn_b & (1 << 5))
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offset = TICK_SIZE;
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ticks = INT_TICKS - ticks;
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ticks = ticks * 10000L / INT_TICKS;
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return ticks + offset;
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}
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static void mste_read(struct MSTE_RTC *val)
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{
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#define COPY(v) val->v=(mste_rtc.v & 0xf)
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do {
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COPY(sec_ones) ; COPY(sec_tens) ; COPY(min_ones) ;
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COPY(min_tens) ; COPY(hr_ones) ; COPY(hr_tens) ;
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COPY(weekday) ; COPY(day_ones) ; COPY(day_tens) ;
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COPY(mon_ones) ; COPY(mon_tens) ; COPY(year_ones) ;
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COPY(year_tens) ;
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/* prevent from reading the clock while it changed */
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} while (val->sec_ones != (mste_rtc.sec_ones & 0xf));
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#undef COPY
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}
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static void mste_write(struct MSTE_RTC *val)
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{
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#define COPY(v) mste_rtc.v=val->v
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do {
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COPY(sec_ones) ; COPY(sec_tens) ; COPY(min_ones) ;
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COPY(min_tens) ; COPY(hr_ones) ; COPY(hr_tens) ;
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COPY(weekday) ; COPY(day_ones) ; COPY(day_tens) ;
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COPY(mon_ones) ; COPY(mon_tens) ; COPY(year_ones) ;
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COPY(year_tens) ;
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/* prevent from writing the clock while it changed */
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} while (val->sec_ones != (mste_rtc.sec_ones & 0xf));
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#undef COPY
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}
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#define RTC_READ(reg) \
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({ unsigned char __val; \
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(void) atari_writeb(reg,&tt_rtc.regsel); \
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__val = tt_rtc.data; \
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__val; \
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})
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#define RTC_WRITE(reg,val) \
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do { \
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atari_writeb(reg,&tt_rtc.regsel); \
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tt_rtc.data = (val); \
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} while(0)
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#define HWCLK_POLL_INTERVAL 5
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int atari_mste_hwclk( int op, struct rtc_time *t )
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{
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int hour, year;
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int hr24=0;
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struct MSTE_RTC val;
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mste_rtc.mode=(mste_rtc.mode | 1);
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hr24=mste_rtc.mon_tens & 1;
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mste_rtc.mode=(mste_rtc.mode & ~1);
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if (op) {
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/* write: prepare values */
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val.sec_ones = t->tm_sec % 10;
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val.sec_tens = t->tm_sec / 10;
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val.min_ones = t->tm_min % 10;
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val.min_tens = t->tm_min / 10;
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hour = t->tm_hour;
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if (!hr24) {
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if (hour > 11)
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hour += 20 - 12;
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if (hour == 0 || hour == 20)
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hour += 12;
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}
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val.hr_ones = hour % 10;
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val.hr_tens = hour / 10;
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val.day_ones = t->tm_mday % 10;
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val.day_tens = t->tm_mday / 10;
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val.mon_ones = (t->tm_mon+1) % 10;
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val.mon_tens = (t->tm_mon+1) / 10;
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year = t->tm_year - 80;
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val.year_ones = year % 10;
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val.year_tens = year / 10;
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val.weekday = t->tm_wday;
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mste_write(&val);
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mste_rtc.mode=(mste_rtc.mode | 1);
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val.year_ones = (year % 4); /* leap year register */
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mste_rtc.mode=(mste_rtc.mode & ~1);
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}
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else {
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mste_read(&val);
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t->tm_sec = val.sec_ones + val.sec_tens * 10;
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t->tm_min = val.min_ones + val.min_tens * 10;
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hour = val.hr_ones + val.hr_tens * 10;
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if (!hr24) {
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if (hour == 12 || hour == 12 + 20)
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hour -= 12;
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if (hour >= 20)
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hour += 12 - 20;
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}
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t->tm_hour = hour;
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t->tm_mday = val.day_ones + val.day_tens * 10;
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t->tm_mon = val.mon_ones + val.mon_tens * 10 - 1;
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t->tm_year = val.year_ones + val.year_tens * 10 + 80;
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t->tm_wday = val.weekday;
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}
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return 0;
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}
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int atari_tt_hwclk( int op, struct rtc_time *t )
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{
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int sec=0, min=0, hour=0, day=0, mon=0, year=0, wday=0;
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unsigned long flags;
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unsigned char ctrl;
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int pm = 0;
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ctrl = RTC_READ(RTC_CONTROL); /* control registers are
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* independent from the UIP */
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if (op) {
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/* write: prepare values */
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sec = t->tm_sec;
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min = t->tm_min;
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hour = t->tm_hour;
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day = t->tm_mday;
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mon = t->tm_mon + 1;
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year = t->tm_year - atari_rtc_year_offset;
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wday = t->tm_wday + (t->tm_wday >= 0);
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if (!(ctrl & RTC_24H)) {
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if (hour > 11) {
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pm = 0x80;
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if (hour != 12)
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hour -= 12;
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}
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else if (hour == 0)
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hour = 12;
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}
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if (!(ctrl & RTC_DM_BINARY)) {
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BIN_TO_BCD(sec);
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BIN_TO_BCD(min);
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BIN_TO_BCD(hour);
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BIN_TO_BCD(day);
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BIN_TO_BCD(mon);
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BIN_TO_BCD(year);
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if (wday >= 0) BIN_TO_BCD(wday);
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}
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}
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/* Reading/writing the clock registers is a bit critical due to
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* the regular update cycle of the RTC. While an update is in
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* progress, registers 0..9 shouldn't be touched.
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* The problem is solved like that: If an update is currently in
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* progress (the UIP bit is set), the process sleeps for a while
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* (50ms). This really should be enough, since the update cycle
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* normally needs 2 ms.
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* If the UIP bit reads as 0, we have at least 244 usecs until the
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* update starts. This should be enough... But to be sure,
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* additionally the RTC_SET bit is set to prevent an update cycle.
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*/
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while( RTC_READ(RTC_FREQ_SELECT) & RTC_UIP )
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schedule_timeout_interruptible(HWCLK_POLL_INTERVAL);
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local_irq_save(flags);
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RTC_WRITE( RTC_CONTROL, ctrl | RTC_SET );
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if (!op) {
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sec = RTC_READ( RTC_SECONDS );
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min = RTC_READ( RTC_MINUTES );
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hour = RTC_READ( RTC_HOURS );
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day = RTC_READ( RTC_DAY_OF_MONTH );
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mon = RTC_READ( RTC_MONTH );
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year = RTC_READ( RTC_YEAR );
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wday = RTC_READ( RTC_DAY_OF_WEEK );
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}
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else {
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RTC_WRITE( RTC_SECONDS, sec );
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RTC_WRITE( RTC_MINUTES, min );
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RTC_WRITE( RTC_HOURS, hour + pm);
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RTC_WRITE( RTC_DAY_OF_MONTH, day );
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RTC_WRITE( RTC_MONTH, mon );
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RTC_WRITE( RTC_YEAR, year );
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if (wday >= 0) RTC_WRITE( RTC_DAY_OF_WEEK, wday );
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}
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RTC_WRITE( RTC_CONTROL, ctrl & ~RTC_SET );
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local_irq_restore(flags);
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if (!op) {
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/* read: adjust values */
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if (hour & 0x80) {
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hour &= ~0x80;
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pm = 1;
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}
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if (!(ctrl & RTC_DM_BINARY)) {
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BCD_TO_BIN(sec);
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BCD_TO_BIN(min);
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BCD_TO_BIN(hour);
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BCD_TO_BIN(day);
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BCD_TO_BIN(mon);
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BCD_TO_BIN(year);
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BCD_TO_BIN(wday);
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}
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if (!(ctrl & RTC_24H)) {
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if (!pm && hour == 12)
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hour = 0;
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else if (pm && hour != 12)
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hour += 12;
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}
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t->tm_sec = sec;
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t->tm_min = min;
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t->tm_hour = hour;
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t->tm_mday = day;
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t->tm_mon = mon - 1;
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t->tm_year = year + atari_rtc_year_offset;
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t->tm_wday = wday - 1;
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}
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return( 0 );
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}
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int atari_mste_set_clock_mmss (unsigned long nowtime)
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{
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short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
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struct MSTE_RTC val;
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unsigned char rtc_minutes;
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mste_read(&val);
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rtc_minutes= val.min_ones + val.min_tens * 10;
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if ((rtc_minutes < real_minutes
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? real_minutes - rtc_minutes
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: rtc_minutes - real_minutes) < 30)
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{
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val.sec_ones = real_seconds % 10;
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val.sec_tens = real_seconds / 10;
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val.min_ones = real_minutes % 10;
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val.min_tens = real_minutes / 10;
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mste_write(&val);
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}
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else
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return -1;
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return 0;
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}
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int atari_tt_set_clock_mmss (unsigned long nowtime)
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{
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int retval = 0;
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short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
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unsigned char save_control, save_freq_select, rtc_minutes;
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save_control = RTC_READ (RTC_CONTROL); /* tell the clock it's being set */
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RTC_WRITE (RTC_CONTROL, save_control | RTC_SET);
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save_freq_select = RTC_READ (RTC_FREQ_SELECT); /* stop and reset prescaler */
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RTC_WRITE (RTC_FREQ_SELECT, save_freq_select | RTC_DIV_RESET2);
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rtc_minutes = RTC_READ (RTC_MINUTES);
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if (!(save_control & RTC_DM_BINARY))
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BCD_TO_BIN (rtc_minutes);
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/* Since we're only adjusting minutes and seconds, don't interfere
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with hour overflow. This avoids messing with unknown time zones
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but requires your RTC not to be off by more than 30 minutes. */
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if ((rtc_minutes < real_minutes
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? real_minutes - rtc_minutes
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: rtc_minutes - real_minutes) < 30)
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{
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if (!(save_control & RTC_DM_BINARY))
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{
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BIN_TO_BCD (real_seconds);
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BIN_TO_BCD (real_minutes);
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}
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RTC_WRITE (RTC_SECONDS, real_seconds);
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RTC_WRITE (RTC_MINUTES, real_minutes);
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}
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else
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retval = -1;
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RTC_WRITE (RTC_FREQ_SELECT, save_freq_select);
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RTC_WRITE (RTC_CONTROL, save_control);
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return retval;
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}
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/*
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* Local variables:
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* c-indent-level: 4
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* tab-width: 8
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* End:
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*/
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