powerpc: macros for e500mc timer regs added

For e500mc cores the watchdog timer period has to be set by means of a
6bit value, that defines the bit of the timebase counter used to signal
a watchdog timer exception on its 0 to 1 transition.
The macro used to set the watchdog period TCR_WP, was redefined for e500mc
to support 6 WP setting.

The parameter (x) given to the macro specifies the prescaling factor of
the time base clock (fTB):

watchdog_period = 1/fTB * 2^x

Signed-off-by: Rainer Boschung <rainer.boschung@keymile.com>
Reviewed-by: York Sun <yorksun@freescale.com>

arch/powerpc/include/asm/processor.h

@@ -378,11 +378,16 @@
 #else
 #define SPRN_TCR	0x154	/* Book E Timer Control Register */
 #endif /* CONFIG_BOOKE */
+#ifdef CONFIG_E500MC
+#define  TCR_WP(x)		(((64-x)&0x3)<<30)| \
+				(((64-x)&0x3c)<<15) /* WDT Period 2^x clocks*/
+#else
 #define   TCR_WP(x)		(((x)&0x3)<<30)	/* WDT Period */
 #define     WP_2_17		0		/* 2^17 clocks */
 #define     WP_2_21		1		/* 2^21 clocks */
 #define     WP_2_25		2		/* 2^25 clocks */
 #define     WP_2_29		3		/* 2^29 clocks */
+#endif /* CONFIG_E500 */
 #define   TCR_WRC(x)		(((x)&0x3)<<28)	/* WDT Reset Control */
 #define     WRC_NONE		0		/* No reset will occur */
 #define     WRC_CORE		1		/* Core reset will occur */