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authorWolfgang Denk <wd@pollux.denx.de>2006-03-12 02:12:27 +0100
committerWolfgang Denk <wd@pollux.denx.de>2006-03-12 02:12:27 +0100
commit6cb142fa3b732a2cea257ca39ef4a7dbe81a32e1 (patch)
tree78e2970c2f95744a0b776b968c24eaca950305c8 /include/asm-blackfin/delay.h
parent0afe519a433184fb1270ff0823971130353a807f (diff)
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Add missing Blackfin files.
Diffstat (limited to 'include/asm-blackfin/delay.h')
-rw-r--r--include/asm-blackfin/delay.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/include/asm-blackfin/delay.h b/include/asm-blackfin/delay.h
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--- /dev/null
+++ b/include/asm-blackfin/delay.h
@@ -0,0 +1,55 @@
+/*
+ * U-boot - delay.h Routines for introducing delays
+ *
+ * Copyright (c) 2005 blackfin.uclinux.org
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef _BLACKFIN_DELAY_H
+#define _BLACKFIN_DELAY_H
+
+/*
+ * Changes made by akbar.hussain@Lineo.com, for BLACKFIN
+ * Copyright (C) 1994 Hamish Macdonald
+ *
+ * Delay routines, using a pre-computed "loops_per_second" value.
+ */
+
+extern __inline__ void __delay(unsigned long loops)
+{
+ __asm__ __volatile__("1:\t%0 += -1;\n\t"
+ "cc = %0 == 0;\n\t"
+ "if ! cc jump 1b;\n":"=d"(loops)
+ :"0"(loops));
+}
+
+/*
+ * Use only for very small delays ( < 1 msec). Should probably use a
+ * lookup table, really, as the multiplications take much too long with
+ * short delays. This is a "reasonable" implementation, though (and the
+ * first constant multiplications gets optimized away if the delay is
+ * a constant)
+ */
+extern __inline__ void udelay(unsigned long usecs)
+{
+ __delay(usecs);
+}
+
+#endif