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[/] [openrisc/] [tags/] [gnu-src/] [newlib-1.18.0/] [newlib-1.18.0-or32-1.0rc1/] [newlib/] [libc/] [machine/] [spu/] [spu_clock_stop.c] - Blame information for rev 345

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Line No. Rev Author Line
1 207 jeremybenn
/*
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(C) Copyright IBM Corp. 2008
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of IBM nor the names of its contributors may be
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used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* SPU clock stop library service.  */
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#include <spu_timer.h>
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#include "spu_timer_internal.h"
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/* Stops the SPU clock:
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    * decrements clock start count
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    * when count is zero, disables the decrementer event and stops the
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      decrementer
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   Returns 0 on success and  <0 on failure:
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    * SPU_CLOCK_ERR_NOT_RUNNING - clock was already off
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    * SPU_CLOCK_ERR_TIMERS_ACTIVE - active timers exist
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    * SPU_CLOCK_ERR_STILL_RUNNING - start count was decremented but clock was
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      not stopped  */
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int
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spu_clock_stop (void)
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{
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  if (__spu_clock_startcnt == 0)
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    return SPU_CLOCK_ERR_NOT_RUNNING;
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  if (__spu_clock_startcnt == 1 && (__spu_timers_active || __spu_timers_handled))
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    return SPU_CLOCK_ERR_TIMERS_ACTIVE;
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  /* Don't stop clock if the clock is still in use.  */
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  if (--__spu_clock_startcnt != 0)
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    return SPU_CLOCK_ERR_STILL_RUNNING;
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  /* Clock stopped, stop decrementer.  */
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  __disable_spu_decr ();
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  /* Clock is enabled on clock start - restore to original state (saved at start).  */
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  if (__likely (!__spu_clock_state_was_enabled))
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    {
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      spu_idisable ();
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    }
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  return 0;
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}

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