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authorwdenk <wdenk>2003-12-08 01:34:36 +0000
committerwdenk <wdenk>2003-12-08 01:34:36 +0000
commit4e5ca3eb670460cd5ad9b07fa4aafc0dee6178be (patch)
tree445ad34577e02b219f118c8825ad5815c3229541 /lib_m68k/time.c
parent9fd5e31fe0245c44a11d35a8603bb6b25c97b5c8 (diff)
* Patch by Bernhard Kuhn, 28 Nov 2003:
add support for Coldfire CPU add support for Motorola M5272C3 and M5282EVB boards
Diffstat (limited to 'lib_m68k/time.c')
-rw-r--r--lib_m68k/time.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/lib_m68k/time.c b/lib_m68k/time.c
new file mode 100644
index 00000000000..5fc27512168
--- /dev/null
+++ b/lib_m68k/time.c
@@ -0,0 +1,87 @@
+/*
+ * (C) Copyright 2000-2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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>
+
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * This function is intended for SHORT delays only.
+ * It will overflow at around 10 seconds @ 400MHz,
+ * or 20 seconds @ 200MHz.
+ */
+unsigned long usec2ticks(unsigned long usec)
+{
+ ulong ticks;
+
+ if (usec < 1000) {
+ ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000;
+ } else {
+ ticks = ((usec / 10) * (get_tbclk() / 100000));
+ }
+
+ return (ticks);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * We implement the delay by converting the delay (the number of
+ * microseconds to wait) into a number of time base ticks; then we
+ * watch the time base until it has incremented by that amount.
+ */
+void udelay(unsigned long usec)
+{
+ ulong ticks = usec2ticks (usec);
+
+ wait_ticks (ticks);
+}
+
+/* ------------------------------------------------------------------------- */
+
+unsigned long ticks2usec(unsigned long ticks)
+{
+ ulong tbclk = get_tbclk();
+
+ /* usec = ticks * 1000000 / tbclk
+ * Multiplication would overflow at ~4.2e3 ticks,
+ * so we break it up into
+ * usec = ( ( ticks * 1000) / tbclk ) * 1000;
+ */
+ ticks *= 1000L;
+ ticks /= tbclk;
+ ticks *= 1000L;
+
+ return ((ulong)ticks);
+}
+
+/* ------------------------------------------------------------------------- */
+
+int init_timebase (void)
+{
+ /* FIXME!! */
+ return 0;
+}
+
+/* ------------------------------------------------------------------------- */