| 1 | /* |
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| 2 | (C) Copyright IBM Corp. 2008 |
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| 3 | |
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| 4 | All rights reserved. |
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| 5 | |
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| 6 | Redistribution and use in source and binary forms, with or without |
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| 7 | modification, are permitted provided that the following conditions are met: |
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| 8 | |
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| 9 | * Redistributions of source code must retain the above copyright notice, |
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| 10 | this list of conditions and the following disclaimer. |
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| 11 | * Redistributions in binary form must reproduce the above copyright |
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| 12 | notice, this list of conditions and the following disclaimer in the |
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| 13 | documentation and/or other materials provided with the distribution. |
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| 14 | * Neither the name of IBM nor the names of its contributors may be |
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| 15 | used to endorse or promote products derived from this software without |
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| 16 | specific prior written permission. |
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| 17 | |
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| 18 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 19 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 20 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 21 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 22 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 23 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 24 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 25 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 26 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 27 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 28 | POSSIBILITY OF SUCH DAMAGE. |
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| 29 | */ |
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| 30 | |
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| 31 | /* SPU clock stop library service. */ |
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| 32 | #include <spu_timer.h> |
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| 33 | #include "spu_timer_internal.h" |
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| 34 | |
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| 35 | /* Stops the SPU clock: |
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| 36 | * decrements clock start count |
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| 37 | * when count is zero, disables the decrementer event and stops the |
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| 38 | decrementer |
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| 39 | Returns 0 on success and <0 on failure: |
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| 40 | * SPU_CLOCK_ERR_NOT_RUNNING - clock was already off |
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| 41 | * SPU_CLOCK_ERR_TIMERS_ACTIVE - active timers exist |
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| 42 | * SPU_CLOCK_ERR_STILL_RUNNING - start count was decremented but clock was |
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| 43 | not stopped */ |
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| 44 | int |
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| 45 | spu_clock_stop (void) |
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| 46 | { |
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| 47 | if (__spu_clock_startcnt == 0) |
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| 48 | return SPU_CLOCK_ERR_NOT_RUNNING; |
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| 49 | |
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| 50 | if (__spu_clock_startcnt == 1 && (__spu_timers_active || __spu_timers_handled)) |
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| 51 | return SPU_CLOCK_ERR_TIMERS_ACTIVE; |
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| 52 | |
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| 53 | /* Don't stop clock if the clock is still in use. */ |
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| 54 | if (--__spu_clock_startcnt != 0) |
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| 55 | return SPU_CLOCK_ERR_STILL_RUNNING; |
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| 56 | |
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| 57 | /* Clock stopped, stop decrementer. */ |
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| 58 | __disable_spu_decr (); |
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| 59 | |
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| 60 | /* Clock is enabled on clock start - restore to original state (saved at start). */ |
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| 61 | if (__likely (!__spu_clock_state_was_enabled)) |
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| 62 | { |
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| 63 | spu_idisable (); |
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| 64 | } |
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| 65 | |
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| 66 | return 0; |
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| 67 | } |
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