ARM: PRIMA2: mv timer to timer-prima2 as we will add timer-marco

Marco timer has different timer IP with prima2, so rename the current timer
to timer-prima2 so that we can add timer-marco.

at the same time, if we don't find prima2 timer node in dt, don't panic the
system as we will make prima2 and marco use same kernel image.

Signed-off-by: Barry Song <Baohua.Song@csr.com>

arch/arm/mach-prima2/Makefile

@@ -1,4 +1,3 @@
-obj-y := timer.o
 obj-y += rstc.o
 obj-y += common.o
 obj-y += rtciobrg.o
@@ -6,3 +5,4 @@ obj-$(CONFIG_DEBUG_LL) += lluart.o
 obj-$(CONFIG_CACHE_L2X0) += l2x0.o
 obj-$(CONFIG_SUSPEND) += pm.o sleep.o
 obj-$(CONFIG_SIRF_IRQ) += irq.o
+obj-$(CONFIG_ARCH_PRIMA2) += timer-prima2.o

arch/arm/mach-prima2/common.c

@@ -40,7 +40,7 @@ DT_MACHINE_START(PRIMA2_DT, "Generic PRIMA2 (Flattened Device Tree)")
 	/* Maintainer: Barry Song <baohua.song@csr.com> */
 	.map_io         = sirfsoc_map_lluart,
 	.init_irq	= sirfsoc_of_irq_init,
-	.init_time	= sirfsoc_timer_init,
+	.init_time	= sirfsoc_prima2_timer_init,
 	.dma_zone_size	= SZ_256M,
 	.init_machine	= sirfsoc_mach_init,
 	.init_late	= sirfsoc_init_late,

arch/arm/mach-prima2/common.h

@@ -12,7 +12,7 @@
 #include <linux/init.h>
 #include <asm/mach/time.h>
 
-extern void sirfsoc_timer_init(void);
+extern void sirfsoc_prima2_timer_init(void);
 
 extern void __init sirfsoc_of_irq_init(void);
 extern void __init sirfsoc_of_clk_init(void);

arch/arm/mach-prima2/timer.c → arch/arm/mach-prima2/timer-prima2.c

@@ -187,7 +187,7 @@ static void __init sirfsoc_clockevent_init(void)
 }
 
 /* initialize the kernel jiffy timer source */
-void __init sirfsoc_timer_init(void)
+void __init sirfsoc_prima2_timer_init(void)
 {
 	unsigned long rate;
 	struct clk *clk;
@@ -226,14 +226,14 @@ static struct of_device_id timer_ids[] = {
 	{},
 };
 
-void __init sirfsoc_of_timer_map(void)
+static void __init sirfsoc_of_timer_map(void)
 {
 	struct device_node *np;
 	const unsigned int *intspec;
 
 	np = of_find_matching_node(NULL, timer_ids);
 	if (!np)
-		panic("unable to find compatible timer node in dtb\n");
+		return;
 	sirfsoc_timer_base = of_iomap(np, 0);
 	if (!sirfsoc_timer_base)
 		panic("unable to map timer cpu registers\n");