OMAP: Timer: Replace bss variable by gd

Reuse the gd->tbl value for timestamp and add gd->lastinc for lastinc bss
values in the OMAP timer driver.

The usage of bss values in drivers before initialisation of bss is forbidden.
In that special case some data in .rel.dyn gets corrupted.

Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
Tested-by: Steve Sakoman <steve.sakoman@linaro.org>
Tested-by: John Rigby <john.rigby@linaro.org>
Tested-by: Nishanth Menon <nm@ti.com>
Acked-by: Nishanth Menon <nm@ti.com>
Tested-by: Heiko Schocher <hs@denx.de>
Tested-by: Sandeep Paulraj <s-paulraj@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

arch/arm/cpu/armv7/omap-common/timer.c

@@ -35,8 +35,8 @@
 #include <common.h>
 #include <asm/io.h>
 
-static ulong timestamp;
-static ulong lastinc;
+DECLARE_GLOBAL_DATA_PTR;
+
 static struct gptimer *timer_base = (struct gptimer *)CONFIG_SYS_TIMERBASE;
 
 /*
@@ -74,7 +74,7 @@ ulong get_timer(ulong base)
 
 void set_timer(ulong t)
 {
-	timestamp = t;
+	gd->tbl = t;
 }
 
 /* delay x useconds */
@@ -96,8 +96,8 @@ void __udelay(unsigned long usec)
 void reset_timer_masked(void)
 {
 	/* reset time, capture current incrementer value time */
-	lastinc = readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ);
-	timestamp = 0;		/* start "advancing" time stamp from 0 */
+	gd->lastinc = readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ);
+	gd->tbl = 0;		/* start "advancing" time stamp from 0 */
 }
 
 ulong get_timer_masked(void)
@@ -105,14 +105,14 @@ ulong get_timer_masked(void)
 	/* current tick value */
 	ulong now = readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ);
 
-	if (now >= lastinc)	/* normal mode (non roll) */
+	if (now >= gd->lastinc)	/* normal mode (non roll) */
 		/* move stamp fordward with absoulte diff ticks */
-		timestamp += (now - lastinc);
+		gd->tbl += (now - gd->lastinc);
 	else	/* we have rollover of incrementer */
-		timestamp += ((TIMER_LOAD_VAL / (TIMER_CLOCK / CONFIG_SYS_HZ))
-				- lastinc) + now;
-	lastinc = now;
-	return timestamp;
+		gd->tbl += ((TIMER_LOAD_VAL / (TIMER_CLOCK / CONFIG_SYS_HZ))
+			     - gd->lastinc) + now;
+	gd->lastinc = now;
+	return gd->tbl;
 }
 
 /*