1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
/*
|
|
* linux/arch/sh/kernel/rtc.c -- SH3 / SH4 on-chip RTC support
|
|
*
|
|
* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
|
|
* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/time.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/rtc.h>
|
|
|
|
#ifndef BCD_TO_BIN
|
|
#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
|
|
#endif
|
|
|
|
#ifndef BIN_TO_BCD
|
|
#define BIN_TO_BCD(val) ((val)=(((val)/10)<<4) + (val)%10)
|
|
#endif
|
|
|
|
void sh_rtc_gettimeofday(struct timespec *ts)
|
|
{
|
|
unsigned int sec128, sec, sec2, min, hr, wk, day, mon, yr, yr100, cf_bit;
|
|
unsigned long flags;
|
|
|
|
again:
|
|
do {
|
|
local_irq_save(flags);
|
|
ctrl_outb(0, RCR1); /* Clear CF-bit */
|
|
sec128 = ctrl_inb(R64CNT);
|
|
sec = ctrl_inb(RSECCNT);
|
|
min = ctrl_inb(RMINCNT);
|
|
hr = ctrl_inb(RHRCNT);
|
|
wk = ctrl_inb(RWKCNT);
|
|
day = ctrl_inb(RDAYCNT);
|
|
mon = ctrl_inb(RMONCNT);
|
|
#if defined(CONFIG_CPU_SH4)
|
|
yr = ctrl_inw(RYRCNT);
|
|
yr100 = (yr >> 8);
|
|
yr &= 0xff;
|
|
#else
|
|
yr = ctrl_inb(RYRCNT);
|
|
yr100 = (yr == 0x99) ? 0x19 : 0x20;
|
|
#endif
|
|
sec2 = ctrl_inb(R64CNT);
|
|
cf_bit = ctrl_inb(RCR1) & RCR1_CF;
|
|
local_irq_restore(flags);
|
|
} while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
|
|
|
|
BCD_TO_BIN(yr100);
|
|
BCD_TO_BIN(yr);
|
|
BCD_TO_BIN(mon);
|
|
BCD_TO_BIN(day);
|
|
BCD_TO_BIN(hr);
|
|
BCD_TO_BIN(min);
|
|
BCD_TO_BIN(sec);
|
|
|
|
if (yr > 99 || mon < 1 || mon > 12 || day > 31 || day < 1 ||
|
|
hr > 23 || min > 59 || sec > 59) {
|
|
printk(KERN_ERR
|
|
"SH RTC: invalid value, resetting to 1 Jan 2000\n");
|
|
local_irq_save(flags);
|
|
ctrl_outb(RCR2_RESET, RCR2); /* Reset & Stop */
|
|
ctrl_outb(0, RSECCNT);
|
|
ctrl_outb(0, RMINCNT);
|
|
ctrl_outb(0, RHRCNT);
|
|
ctrl_outb(6, RWKCNT);
|
|
ctrl_outb(1, RDAYCNT);
|
|
ctrl_outb(1, RMONCNT);
|
|
#if defined(CONFIG_CPU_SH4)
|
|
ctrl_outw(0x2000, RYRCNT);
|
|
#else
|
|
ctrl_outb(0, RYRCNT);
|
|
#endif
|
|
ctrl_outb(RCR2_RTCEN|RCR2_START, RCR2); /* Start */
|
|
goto again;
|
|
}
|
|
|
|
#if RTC_BIT_INVERTED != 0
|
|
if ((sec128 & RTC_BIT_INVERTED))
|
|
sec--;
|
|
#endif
|
|
|
|
ts->tv_sec = mktime(yr100 * 100 + yr, mon, day, hr, min, sec);
|
|
ts->tv_nsec = ((sec128 * 1000000) / 128) * 1000;
|
|
}
|
|
|
|
/*
|
|
* Changed to only care about tv_sec, and not the full timespec struct
|
|
* (i.e. tv_nsec). It can easily be switched to timespec for future cpus
|
|
* that support setting usec or nsec RTC values.
|
|
*/
|
|
int sh_rtc_settimeofday(const time_t secs)
|
|
{
|
|
int retval = 0;
|
|
int real_seconds, real_minutes, cmos_minutes;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
ctrl_outb(RCR2_RESET, RCR2); /* Reset pre-scaler & stop RTC */
|
|
|
|
cmos_minutes = ctrl_inb(RMINCNT);
|
|
BCD_TO_BIN(cmos_minutes);
|
|
|
|
/*
|
|
* since we're only adjusting minutes and seconds,
|
|
* don't interfere with hour overflow. This avoids
|
|
* messing with unknown time zones but requires your
|
|
* RTC not to be off by more than 15 minutes
|
|
*/
|
|
real_seconds = secs % 60;
|
|
real_minutes = secs / 60;
|
|
if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
|
|
real_minutes += 30; /* correct for half hour time zone */
|
|
real_minutes %= 60;
|
|
|
|
if (abs(real_minutes - cmos_minutes) < 30) {
|
|
BIN_TO_BCD(real_seconds);
|
|
BIN_TO_BCD(real_minutes);
|
|
ctrl_outb(real_seconds, RSECCNT);
|
|
ctrl_outb(real_minutes, RMINCNT);
|
|
} else {
|
|
printk(KERN_WARNING
|
|
"set_rtc_time: can't update from %d to %d\n",
|
|
cmos_minutes, real_minutes);
|
|
retval = -1;
|
|
}
|
|
|
|
ctrl_outb(RCR2_RTCEN|RCR2_START, RCR2); /* Start RTC */
|
|
local_irq_restore(flags);
|
|
|
|
return retval;
|
|
}
|