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authorRafaël Carré <rafael.carre@gmail.com>2009-06-29 14:29:14 +0000
committerRafaël Carré <rafael.carre@gmail.com>2009-06-29 14:29:14 +0000
commitb3ed33d04aec20568b8bb9616349e6d7e4c71882 (patch)
treefbbfbe3d48cf8e61fc822d7f6fc14db8f46810d6 /firmware/target/sh
parentc34ca87b64b71741327ec2ca7908080427babab0 (diff)
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Move SH7034 timer code in the target tree
Add an argument int_prio to TIMER_START() macro because SH7034 needs it Leaves a target specific code in timer_register (could be given to target code through timer_set and __timer_set() ) git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21556 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/sh')
-rw-r--r--firmware/target/sh/archos/timer-archos.c85
-rw-r--r--firmware/target/sh/archos/timer-target.h41
2 files changed, 126 insertions, 0 deletions
diff --git a/firmware/target/sh/archos/timer-archos.c b/firmware/target/sh/archos/timer-archos.c
new file mode 100644
index 0000000000..e7526a8409
--- /dev/null
+++ b/firmware/target/sh/archos/timer-archos.c
@@ -0,0 +1,85 @@
+/***************************************************************************
+* __________ __ ___.
+* Open \______ \ ____ ____ | | _\_ |__ _______ ___
+* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+* \/ \/ \/ \/ \/
+* $Id$
+*
+* Copyright (C) 2005 Jens Arnold
+*
+* 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 "cpu.h"
+#include "system.h"
+#include "timer.h"
+#include "timer-target.h"
+
+void IMIA4(void) __attribute__((interrupt_handler));
+void IMIA4(void)
+{
+ if (pfn_timer != NULL)
+ pfn_timer();
+ and_b(~0x01, &TSR4); /* clear the interrupt */
+}
+
+bool __timer_set(long cycles, bool start)
+{
+ int phi = 0; /* bits for the prescaler */
+ int prescale = 1;
+
+ while (cycles > 0x10000)
+ { /* work out the smallest prescaler that makes it fit */
+ phi++;
+ prescale <<= 1;
+ cycles >>= 1;
+ }
+
+ if (prescale > 8)
+ return false;
+
+ if (start)
+ {
+ if (pfn_unregister != NULL)
+ {
+ pfn_unregister();
+ pfn_unregister = NULL;
+ }
+
+ and_b(~0x10, &TSTR); /* Stop the timer 4 */
+ and_b(~0x10, &TSNC); /* No synchronization */
+ and_b(~0x10, &TMDR); /* Operate normally */
+
+ TIER4 = 0xF9; /* Enable GRA match interrupt */
+ }
+
+ TCR4 = 0x20 | phi; /* clear at GRA match, set prescaler */
+ GRA4 = (unsigned short)(cycles - 1);
+ if (start || (TCNT4 >= GRA4))
+ TCNT4 = 0;
+ and_b(~0x01, &TSR4); /* clear an eventual interrupt */
+
+ return true;
+}
+
+bool __timer_start(int int_prio)
+{
+ IPRD = (IPRD & 0xFF0F) | int_prio << 4; /* interrupt priority */
+ or_b(0x10, &TSTR); /* start timer 4 */
+ return true;
+}
+
+void __timer_stop(void)
+{
+ and_b(~0x10, &TSTR); /* stop the timer 4 */
+ IPRD = (IPRD & 0xFF0F); /* disable interrupt */
+}
diff --git a/firmware/target/sh/archos/timer-target.h b/firmware/target/sh/archos/timer-target.h
new file mode 100644
index 0000000000..08fcae1156
--- /dev/null
+++ b/firmware/target/sh/archos/timer-target.h
@@ -0,0 +1,41 @@
+/***************************************************************************
+* __________ __ ___.
+* Open \______ \ ____ ____ | | _\_ |__ _______ ___
+* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+* \/ \/ \/ \/ \/
+* $Id$
+*
+* Copyright (C) 2005 Jens Arnold
+*
+* 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.
+*
+****************************************************************************/
+#ifndef TIMER_TARGET_H
+#define TIMER_TARGET_H
+
+#include "config.h"
+
+bool __timer_set(long cycles, bool start);
+bool __timer_start(int int_prio);
+void __timer_stop(void);
+
+#define TIMER_FREQ CPU_FREQ
+
+#define __TIMER_SET(cycles, set) \
+ __timer_set(cycles, set)
+
+#define __TIMER_START(int_prio) \
+ __timer_start(int_prio)
+
+#define __TIMER_STOP(...) \
+ __timer_stop()
+
+#endif /* TIMER_TARGET_H */