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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [machine/] [spu/] [spu_clock_stop.c] - Rev 859
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/* (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; }
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