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authorMichael Sevakis <jethead71@rockbox.org>2008-10-29 10:26:46 +0000
committerMichael Sevakis <jethead71@rockbox.org>2008-10-29 10:26:46 +0000
commit48544f070b2319a5131f25c78516fbb9a1b2a123 (patch)
tree6bf210fb01101fad66fa717540c9038b4e19c9cc /firmware/target/coldfire
parent3bfc51d894536a411c4a0da85c0a428f341d8b80 (diff)
downloadrockbox-48544f070b2319a5131f25c78516fbb9a1b2a123.tar.gz
rockbox-48544f070b2319a5131f25c78516fbb9a1b2a123.zip
Move kernel tick initialization and handling to the target tree for ones remaining in kernel.c
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18919 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/coldfire')
-rw-r--r--firmware/target/coldfire/kernel-coldfire.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/firmware/target/coldfire/kernel-coldfire.c b/firmware/target/coldfire/kernel-coldfire.c
new file mode 100644
index 0000000000..093736ee91
--- /dev/null
+++ b/firmware/target/coldfire/kernel-coldfire.c
@@ -0,0 +1,64 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Björn Stenberg
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "system.h"
+#include "kernel.h"
+#include "panic.h"
+
+void tick_start(unsigned int interval_in_ms)
+{
+ unsigned long count;
+ int prescale;
+
+ count = CPU_FREQ/2 * interval_in_ms / 1000 / 16;
+
+ if(count > 0x10000)
+ {
+ panicf("Error! The tick interval is too long (%d ms)\n",
+ interval_in_ms);
+ return;
+ }
+
+ prescale = cpu_frequency / CPU_FREQ;
+ /* Note: The prescaler is later adjusted on-the-fly on CPU frequency
+ changes within timer.c */
+
+ /* We are using timer 0 */
+
+ TRR0 = (unsigned short)(count - 1); /* The reference count */
+ TCN0 = 0; /* reset the timer */
+ TMR0 = 0x001d | ((unsigned short)(prescale - 1) << 8);
+ /* restart, CLK/16, enabled, prescaler */
+
+ TER0 = 0xff; /* Clear all events */
+
+ ICR1 = 0x8c; /* Interrupt on level 3.0 */
+ IMR &= ~0x200;
+}
+
+void TIMER0(void) __attribute__ ((interrupt_handler));
+void TIMER0(void)
+{
+ /* Run through the list of tick tasks */
+ call_tick_tasks();
+
+ TER0 = 0xff; /* Clear all events */
+}