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authorMatthias Kaehlcke <matthias@kaehlcke.net>2010-02-01 21:29:48 +0100
committerTom Rix <Tom.Rix@windriver.com>2010-02-05 15:48:28 -0600
commit8ed0f6108ff771ea605c896ce6e416b502f2cb55 (patch)
treec80ba4c75088e4b9575f178237a2a268cf355b06 /board/edb93xx/early_udelay.h
parent7f5a9c237e1ab2488518953442bcde882c5edd66 (diff)
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Add support for EDB93xx boards
Added support for the following EDB93xx boards: EDB9301 EDB9302 EDB9302A EDB9307 EDB9307A EDB93012 EDB9315 EDB9315A Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Diffstat (limited to 'board/edb93xx/early_udelay.h')
-rw-r--r--board/edb93xx/early_udelay.h34
1 files changed, 34 insertions, 0 deletions
diff --git a/board/edb93xx/early_udelay.h b/board/edb93xx/early_udelay.h
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+++ b/board/edb93xx/early_udelay.h
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+/*
+ * Copyright (C) 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
+ *
+ * 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
+ */
+
+#include <common.h>
+
+/* delay execution before timers are initialized */
+static inline void early_udelay(uint32_t usecs)
+{
+ /* loop takes 4 cycles at 5.0ns (fastest case, running at 200MHz) */
+ register uint32_t loops = (usecs * 1000) / 20;
+
+ __asm__ volatile ("1:\n"
+ "subs %0, %1, #1\n"
+ "bne 1b":"=r" (loops):"0" (loops));
+}