h8300: library functions

[sfrench/cifs-2.6.git] / arch / h8300 / lib / delay.c

diff --git a/arch/h8300/lib/delay.c b/arch/h8300/lib/delay.c
new file mode 100644 (file)
index 0000000..463f6b3
--- /dev/null
+++ b/arch/h8300/lib/delay.c
@@ -0,0 +1,40 @@
+/*
+ * delay loops
+ *
+ * Copyright (C) 2015 Yoshinori Sato
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <asm/param.h>
+#include <asm/processor.h>
+#include <asm/timex.h>
+
+void __delay(unsigned long cycles)
+{
+       __asm__ volatile ("1: dec.l #1,%0\n\t"
+                         "bne 1b":"=r"(cycles):"0"(cycles));
+}
+EXPORT_SYMBOL(__delay);
+
+void __const_udelay(unsigned long xloops)
+{
+       u64 loops;
+
+       loops = (u64)xloops * loops_per_jiffy * HZ;
+
+       __delay(loops >> 32);
+}
+EXPORT_SYMBOL(__const_udelay);
+
+void __udelay(unsigned long usecs)
+{
+       __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */
+}
+EXPORT_SYMBOL(__udelay);
+
+void __ndelay(unsigned long nsecs)
+{
+       __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */
+}
+EXPORT_SYMBOL(__ndelay);