[ARM] Allow Versatile to be built for AB and PB

If a configuration was chosen to support both the Versatile
AB and PB boards, the result would write to registers not
available on the PB version of the board. Resolve this by
using machine_is_xxx().

Also, for the CLCD, despite how the code looks, both the AB
and PB access the same location to control the clock rate -
it's just called something different between the two board
versions. Invent our own name for this location and use it
unconditionally.

Signed-off-by: Russell King <[e-mail]>

arch/arm/mach-versatile/core.c

···
 #include <asm/hardware/arm_timer.h>
 #include <asm/hardware/icst307.h>
 #include <asm/hardware/vic.h>
+#include <asm/mach-types.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/flash.h>
···
 static void versatile_oscvco_set(struct clk *clk, struct icst307_vco vco)
 {
 	void __iomem *sys_lock = __io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_LOCK_OFFSET;
-#if defined(CONFIG_ARCH_VERSATILE_PB)
-	void __iomem *sys_osc = __io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_OSC4_OFFSET;
-#elif defined(CONFIG_MACH_VERSATILE_AB)
-	void __iomem *sys_osc = __io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_OSC1_OFFSET;
-#endif
+	void __iomem *sys_osc = __io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_OSCCLCD_OFFSET;
 	u32 val;
 
 	val = readl(sys_osc) & ~0x7ffff;
···
 	/*
 	 * If the LCD is Sanyo 2x5 in on the IB2 board, turn the back-light off
 	 */
-	if (fb->panel == &sanyo_2_5_in) {
+	if (machine_is_versatile_ab() && fb->panel == &sanyo_2_5_in) {
 		void __iomem *versatile_ib2_ctrl = __io_address(VERSATILE_IB2_CTRL);
 		unsigned long ctrl;
 
···
 	/*
 	 * If the LCD is Sanyo 2x5 in on the IB2 board, turn the back-light on
 	 */
-	if (fb->panel == &sanyo_2_5_in) {
+	if (machine_is_versatile_ab() && fb->panel == &sanyo_2_5_in) {
 		void __iomem *versatile_ib2_ctrl = __io_address(VERSATILE_IB2_CTRL);
 		unsigned long ctrl;
 

include/asm-arm/arch-versatile/platform.h

···
 #define VERSATILE_SYS_OSC1_OFFSET             0x1C
 #endif
 
+#define VERSATILE_SYS_OSCCLCD_OFFSET          0x1c
+
 #define VERSATILE_SYS_LOCK_OFFSET             0x20
 #define VERSATILE_SYS_100HZ_OFFSET            0x24
 #define VERSATILE_SYS_CFGDATA1_OFFSET         0x28