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author | Michael Sevakis <jethead71@rockbox.org> | 2008-10-29 10:26:46 +0000 |
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committer | Michael Sevakis <jethead71@rockbox.org> | 2008-10-29 10:26:46 +0000 |
commit | 48544f070b2319a5131f25c78516fbb9a1b2a123 (patch) | |
tree | 6bf210fb01101fad66fa717540c9038b4e19c9cc /firmware/target/coldfire | |
parent | 3bfc51d894536a411c4a0da85c0a428f341d8b80 (diff) | |
download | rockbox-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.c | 64 |
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 */ +} |