1 files changed, 75 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/include/asm/delay.h b/target/linux/ubicom32/files/arch/ubicom32/include/asm/delay.h
new file mode 100644
index 000000000..0e5025c46
--- /dev/null
+++ b/target/linux/ubicom32/files/arch/ubicom32/include/asm/delay.h
@@ -0,0 +1,75 @@
+/*
+ * arch/ubicom32/include/asm/delay.h
+ *   Definition of delay routines for Ubicom32 architecture.
+ *
+ * (C) Copyright 2009, Ubicom, Inc.
+ *
+ * This file is part of the Ubicom32 Linux Kernel Port.
+ *
+ * The Ubicom32 Linux Kernel Port is free software: you can redistribute
+ * it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * The Ubicom32 Linux Kernel Port is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with the Ubicom32 Linux Kernel Port.  If not,
+ * see <http://www.gnu.org/licenses/>.
+ *
+ * Ubicom32 implementation derived from (with many thanks):
+ *   arch/m68knommu
+ *   arch/blackfin
+ *   arch/parisc
+ */
+#ifndef _ASM_UBICOM32_DELAY_H
+#define _ASM_UBICOM32_DELAY_H
+
+#include <asm/param.h>
+#include <asm/ip5000.h>
+
+static inline void __delay(unsigned long loops)
+{
+	if (loops == 0) {
+		return;
+	}
+
+	asm volatile (
+	"1:	add.4	%0, #-1, %0		\n\t"
+	"	jmpne.t	1b			\n\t"
+	: "+d" (loops)
+	);
+}
+
+/*
+ *	Ubicom32 processor uses fixed 12MHz external OSC.
+ *	So we use that as reference to count 12 cycles/us
+ */
+
+extern unsigned long loops_per_jiffy;
+
+static inline void _udelay(unsigned long usecs)
+{
+#if defined(CONFIG_UBICOM32_V4) || defined(CONFIG_UBICOM32_V3)
+	asm volatile (
+		"	add.4		d15, 0(%0), %1			\n\t"
+		"	sub.4		#0, 0(%0), d15			\n\t"
+		"	jmpmi.w.f	.-4				\n\t"
+		:
+		: "a"(TIMER_BASE + TIMER_MPTVAL), "d"(usecs * (12000000/1000000))
+		: "d15"
+	);
+#else
+	BUG();
+#endif
+}
+
+/*
+ *	Moved the udelay() function into library code, no longer inlined.
+ */
+extern void udelay(unsigned long usecs);
+
+#endif /* _ASM_UBICOM32_DELAY_H */