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fa60ce2cb4
The section "19) Editor modelines and other cruft" in Documentation/process/coding-style.rst clearly says, "Do not include any of these in source files." I recently receive a patch to explicitly add a new one. Let's do treewide cleanups, otherwise some people follow the existing code and attempt to upstream their favoriate editor setups. It is even nicer if scripts/checkpatch.pl can check it. If we like to impose coding style in an editor-independent manner, I think editorconfig (patch [1]) is a saner solution. [1] https://lore.kernel.org/lkml/20200703073143.423557-1-danny@kdrag0n.dev/ Link: https://lkml.kernel.org/r/20210324054457.1477489-1-masahiroy@kernel.org Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Miguel Ojeda <ojeda@kernel.org> [auxdisplay] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
320 lines
8.2 KiB
C
320 lines
8.2 KiB
C
/*
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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 <linux/clocksource.h>
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#include <linux/delay.h>
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#include <linux/export.h>
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#include <asm/atariints.h>
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#include <asm/machdep.h>
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DEFINE_SPINLOCK(rtc_lock);
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EXPORT_SYMBOL_GPL(rtc_lock);
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static u64 atari_read_clk(struct clocksource *cs);
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static struct clocksource atari_clk = {
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.name = "mfp",
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.rating = 100,
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.read = atari_read_clk,
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.mask = CLOCKSOURCE_MASK(32),
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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static u32 clk_total;
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static u8 last_timer_count;
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static irqreturn_t mfp_timer_c_handler(int irq, void *dev_id)
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{
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unsigned long flags;
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local_irq_save(flags);
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do {
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last_timer_count = st_mfp.tim_dt_c;
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} while (last_timer_count == 1);
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clk_total += INT_TICKS;
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legacy_timer_tick(1);
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timer_heartbeat();
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local_irq_restore(flags);
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return IRQ_HANDLED;
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}
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void __init
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atari_sched_init(void)
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{
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/* set Timer C data Register */
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st_mfp.tim_dt_c = INT_TICKS;
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/* start timer C, div = 1:100 */
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st_mfp.tim_ct_cd = (st_mfp.tim_ct_cd & 15) | 0x60;
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/* install interrupt service routine for MFP Timer C */
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if (request_irq(IRQ_MFP_TIMC, mfp_timer_c_handler, IRQF_TIMER, "timer",
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NULL))
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pr_err("Couldn't register timer interrupt\n");
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clocksource_register_hz(&atari_clk, INT_CLK);
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}
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/* ++andreas: gettimeoffset fixed to check for pending interrupt */
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static u64 atari_read_clk(struct clocksource *cs)
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{
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unsigned long flags;
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u8 count;
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u32 ticks;
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local_irq_save(flags);
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/* Ensure that the count is monotonically decreasing, even though
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* the result may briefly stop changing after counter wrap-around.
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*/
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count = min(st_mfp.tim_dt_c, last_timer_count);
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last_timer_count = count;
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ticks = INT_TICKS - count;
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ticks += clk_total;
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local_irq_restore(flags);
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return ticks;
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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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sec = bin2bcd(sec);
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min = bin2bcd(min);
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hour = bin2bcd(hour);
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day = bin2bcd(day);
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mon = bin2bcd(mon);
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year = bin2bcd(year);
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if (wday >= 0)
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wday = bin2bcd(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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if (in_atomic() || irqs_disabled())
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mdelay(1);
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else
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schedule_timeout_interruptible(HWCLK_POLL_INTERVAL);
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}
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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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sec = bcd2bin(sec);
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min = bcd2bin(min);
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hour = bcd2bin(hour);
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day = bcd2bin(day);
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mon = bcd2bin(mon);
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year = bcd2bin(year);
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wday = bcd2bin(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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