rtc-m48t59: shift zero year to 1968 on sparc (rev 2)

Shift the first year to 1968 for Sun SPARC machines.

Move this logic from platform specific files to rtc driver
as this fixes problems with calculating a century bit.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Tested-by: Alexander Beregalov
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 30 insertions, 4 deletions

diff --git a/drivers/rtc/rtc-m48t59.c b/drivers/rtc/rtc-m48t59.c
index 04b63dab693..43afb7ab528 100644
--- a/drivers/rtc/rtc-m48t59.c
+++ b/drivers/rtc/rtc-m48t59.c
@@ -87,6 +87,10 @@ static int m48t59_rtc_read_time(struct device *dev, struct rtc_time *tm)
 		dev_dbg(dev, "Century bit is enabled\n");
 		tm->tm_year += 100;	/* one century */
 	}
+#ifdef CONFIG_SPARC
+	/* Sun SPARC machines count years since 1968 */
+	tm->tm_year += 68;
+#endif
 
 	tm->tm_wday	= bcd2bin(val & 0x07);
 	tm->tm_hour	= bcd2bin(M48T59_READ(M48T59_HOUR) & 0x3F);
@@ -110,11 +114,20 @@ static int m48t59_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
 	unsigned long flags;
 	u8 val = 0;
+	int year = tm->tm_year;
+
+#ifdef CONFIG_SPARC
+	/* Sun SPARC machines count years since 1968 */
+	year -= 68;
+#endif
 
 	dev_dbg(dev, "RTC set time %04d-%02d-%02d %02d/%02d/%02d\n",
-		tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
+		year + 1900, tm->tm_mon, tm->tm_mday,
 		tm->tm_hour, tm->tm_min, tm->tm_sec);
 
+	if (year < 0)
+		return -EINVAL;
+
 	spin_lock_irqsave(&m48t59->lock, flags);
 	/* Issue the WRITE command */
 	M48T59_SET_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
@@ -125,9 +138,9 @@ static int m48t59_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	M48T59_WRITE((bin2bcd(tm->tm_mday) & 0x3F), M48T59_MDAY);
 	/* tm_mon is 0-11 */
 	M48T59_WRITE((bin2bcd(tm->tm_mon + 1) & 0x1F), M48T59_MONTH);
-	M48T59_WRITE(bin2bcd(tm->tm_year % 100), M48T59_YEAR);
+	M48T59_WRITE(bin2bcd(year % 100), M48T59_YEAR);
 
-	if (pdata->type == M48T59RTC_TYPE_M48T59 && (tm->tm_year / 100))
+	if (pdata->type == M48T59RTC_TYPE_M48T59 && (year / 100))
 		val = (M48T59_WDAY_CEB | M48T59_WDAY_CB);
 	val |= (bin2bcd(tm->tm_wday) & 0x07);
 	M48T59_WRITE(val, M48T59_WDAY);
@@ -159,6 +172,10 @@ static int m48t59_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
 	M48T59_SET_BITS(M48T59_CNTL_READ, M48T59_CNTL);
 
 	tm->tm_year = bcd2bin(M48T59_READ(M48T59_YEAR));
+#ifdef CONFIG_SPARC
+	/* Sun SPARC machines count years since 1968 */
+	tm->tm_year += 68;
+#endif
 	/* tm_mon is 0-11 */
 	tm->tm_mon = bcd2bin(M48T59_READ(M48T59_MONTH)) - 1;
 
@@ -192,11 +209,20 @@ static int m48t59_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 	struct rtc_time *tm = &alrm->time;
 	u8 mday, hour, min, sec;
 	unsigned long flags;
+	int year = tm->tm_year;
+
+#ifdef CONFIG_SPARC
+	/* Sun SPARC machines count years since 1968 */
+	year -= 68;
+#endif
 
 	/* If no irq, we don't support ALARM */
 	if (m48t59->irq == NO_IRQ)
 		return -EIO;
 
+	if (year < 0)
+		return -EINVAL;
+
 	/*
 	 * 0xff means "always match"
 	 */
@@ -228,7 +254,7 @@ static int m48t59_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 	spin_unlock_irqrestore(&m48t59->lock, flags);
 
 	dev_dbg(dev, "RTC set alarm time %04d-%02d-%02d %02d/%02d/%02d\n",
-		tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
+		year + 1900, tm->tm_mon, tm->tm_mday,
 		tm->tm_hour, tm->tm_min, tm->tm_sec);
 	return 0;
 }