arm: set initrd_start/initrd_end for fdt scan

In order to unify the initrd scanning for DT across architectures, make
arm set initrd_start and initrd_end instead of the physical addresses.
This is aligned with all other architectures.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Acked-by: Grant Likely <grant.likely@linaro.org>

arch/arm/mm/init.c

@@ -77,11 +77,11 @@ static int __init parse_tag_initrd2(const struct tag *tag)
 
 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
 
-#ifdef CONFIG_OF_FLATTREE
+#if defined(CONFIG_OF_FLATTREE) && defined(CONFIG_BLK_DEV_INITRD)
 void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
 {
-	phys_initrd_start = start;
-	phys_initrd_size = end - start;
+	initrd_start = (unsigned long)__va(start);
+	initrd_end = (unsigned long)__va(end);
 }
 #endif /* CONFIG_OF_FLATTREE */
 
@@ -351,6 +351,11 @@ void __init arm_memblock_init(struct meminfo *mi,
 	memblock_reserve(__pa(_stext), _end - _stext);
 #endif
 #ifdef CONFIG_BLK_DEV_INITRD
+	/* FDT scan will populate initrd_start */
+	if (initrd_start) {
+		phys_initrd_start = __virt_to_phys(initrd_start);
+		phys_initrd_size = initrd_end - initrd_start;
+	}
 	if (phys_initrd_size &&
 	    !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
 		pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n",