+
+#ifdef CONFIG_USE_IRQ
+
+.LC0: .word loops_per_jiffy
+
+/*
+ * 0 <= r0 <= 2000
+ */
+.globl udelay
+udelay:
+ mov r2, #0x6800
+ orr r2, r2, #0x00db
+ mul r0, r2, r0
+ ldr r2, .LC0
+ ldr r2, [r2] @ max = 0x0fffffff
+ mov r0, r0, lsr #11 @ max = 0x00003fff
+ mov r2, r2, lsr #11 @ max = 0x0003ffff
+ mul r0, r2, r0 @ max = 2^32-1
+ movs r0, r0, lsr #6
+
+delay_loop:
+ subs r0, r0, #1
+ bne delay_loop
+ mov pc, lr
+
+#endif /* CONFIG_USE_IRQ */