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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/sh
parent3bfc51d894536a411c4a0da85c0a428f341d8b80 (diff)
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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/sh')
-rw-r--r--firmware/target/sh/kernel-sh.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/firmware/target/sh/kernel-sh.c b/firmware/target/sh/kernel-sh.c
new file mode 100644
index 0000000000..905b272fce
--- /dev/null
+++ b/firmware/target/sh/kernel-sh.c
@@ -0,0 +1,65 @@
+/***************************************************************************
+ * __________ __ ___.
+ * 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;
+
+ count = CPU_FREQ * interval_in_ms / 1000 / 8;
+
+ if(count > 0x10000)
+ {
+ panicf("Error! The tick interval is too long (%d ms)\n",
+ interval_in_ms);
+ return;
+ }
+
+ /* We are using timer 0 */
+
+ TSTR &= ~0x01; /* Stop the timer */
+ TSNC &= ~0x01; /* No synchronization */
+ TMDR &= ~0x01; /* Operate normally */
+
+ TCNT0 = 0; /* Start counting at 0 */
+ GRA0 = (unsigned short)(count - 1);
+ TCR0 = 0x23; /* Clear at GRA match, sysclock/8 */
+
+ /* Enable interrupt on level 1 */
+ IPRC = (IPRC & ~0x00f0) | 0x0010;
+
+ TSR0 &= ~0x01;
+ TIER0 = 0xf9; /* Enable GRA match interrupt */
+
+ TSTR |= 0x01; /* Start timer 1 */
+}
+
+void IMIA0(void) __attribute__ ((interrupt_handler));
+void IMIA0(void)
+{
+ /* Run through the list of tick tasks */
+ call_tick_tasks();
+
+ TSR0 &= ~0x01;
+}