68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
|
/*
|
||
|
|
(C) Copyright IBM Corp. 2008
|
||
|
|
|
||
|
|
All rights reserved.
|
||
|
|
|
||
|
|
Redistribution and use in source and binary forms, with or without
|
||
|
|
modification, are permitted provided that the following conditions are met:
|
||
|
|
|
||
|
|
* Redistributions of source code must retain the above copyright notice,
|
||
|
|
this list of conditions and the following disclaimer.
|
||
|
|
* Redistributions in binary form must reproduce the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer in the
|
||
|
|
documentation and/or other materials provided with the distribution.
|
||
|
|
* Neither the name of IBM nor the names of its contributors may be
|
||
|
|
used to endorse or promote products derived from this software without
|
||
|
|
specific prior written permission.
|
||
|
|
|
||
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
||
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
||
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* SPU clock stop library service. */
|
||
|
|
#include <spu_timer.h>
|
||
|
|
#include "spu_timer_internal.h"
|
||
|
|
|
||
|
|
/* Stops the SPU clock:
|
||
|
|
* decrements clock start count
|
||
|
|
* when count is zero, disables the decrementer event and stops the
|
||
|
|
decrementer
|
||
|
|
Returns 0 on success and <0 on failure:
|
||
|
|
* SPU_CLOCK_ERR_NOT_RUNNING - clock was already off
|
||
|
|
* SPU_CLOCK_ERR_TIMERS_ACTIVE - active timers exist
|
||
|
|
* SPU_CLOCK_ERR_STILL_RUNNING - start count was decremented but clock was
|
||
|
|
not stopped */
|
||
|
|
int
|
||
|
|
spu_clock_stop (void)
|
||
|
|
{
|
||
|
|
if (__spu_clock_startcnt == 0)
|
||
|
|
return SPU_CLOCK_ERR_NOT_RUNNING;
|
||
|
|
|
||
|
|
if (__spu_clock_startcnt == 1 && (__spu_timers_active || __spu_timers_handled))
|
||
|
|
return SPU_CLOCK_ERR_TIMERS_ACTIVE;
|
||
|
|
|
||
|
|
/* Don't stop clock if the clock is still in use. */
|
||
|
|
if (--__spu_clock_startcnt != 0)
|
||
|
|
return SPU_CLOCK_ERR_STILL_RUNNING;
|
||
|
|
|
||
|
|
/* Clock stopped, stop decrementer. */
|
||
|
|
__disable_spu_decr ();
|
||
|
|
|
||
|
|
/* Clock is enabled on clock start - restore to original state (saved at start). */
|
||
|
|
if (__likely (!__spu_clock_state_was_enabled))
|
||
|
|
{
|
||
|
|
spu_idisable ();
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|