Commit 356a9ce1 authored by Matt Mackall's avatar Matt Mackall Committed by Linus Torvalds
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[PATCH] RTC: Remove RTC UIP synchronization on SH MPC1211



Signed-off-by: default avatarMatt Mackall <mpm@selenic.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 04cfbee0
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+3 −15
Original line number Diff line number Diff line
@@ -19,26 +19,13 @@
#define BIN_TO_BCD(val) ((val)=(((val)/10)<<4) + (val)%10)
#endif

/* arc/i386/kernel/time.c */
unsigned long get_cmos_time(void)
{
	unsigned int year, mon, day, hour, min, sec;
	int i;

	spin_lock(&rtc_lock);
	/* The Linux interpretation of the CMOS clock register contents:
	 * When the Update-In-Progress (UIP) flag goes from 1 to 0, the
	 * RTC registers show the second which has precisely just started.
	 * Let's hope other operating systems interpret the RTC the same way.
	 */
	/* read RTC exactly on falling edge of update flag */
	for (i = 0 ; i < 1000000 ; i++)	/* may take up to 1 second... */
		if (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP)
			break;
	for (i = 0 ; i < 1000000 ; i++)	/* must try at least 2.228 ms */
		if (!(CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP))
			break;
	do { /* Isn't this overkill ? UIP above should guarantee consistency */

	do {
		sec = CMOS_READ(RTC_SECONDS);
		min = CMOS_READ(RTC_MINUTES);
		hour = CMOS_READ(RTC_HOURS);
@@ -46,6 +33,7 @@ unsigned long get_cmos_time(void)
		mon = CMOS_READ(RTC_MONTH);
		year = CMOS_READ(RTC_YEAR);
	} while (sec != CMOS_READ(RTC_SECONDS));

	if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
	  {
	    BCD_TO_BIN(sec);