| 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 timer free 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 | |
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| 36 | /* Frees an allocated timer. The timer must be in the stopped state for this |
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| 37 | to succeed. Maybe be called: |
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| 38 | * after allocated, before it's started |
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| 39 | * after it's been explicitly stopped |
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| 40 | Returns 0 on success, timer sucessfully deallocated. Returns <0 on failure |
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| 41 | * SPU_TIMER_INVALID_ID - id out of range |
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| 42 | * SPU_TIMER_ERR_FREE - id in free state |
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| 43 | * SPU_TIMER_ERR_ACTIVE - id in handled or active state */ |
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| 44 | int |
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| 45 | spu_timer_free (int id) |
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| 46 | { |
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| 47 | spu_timer_t *t, **pn; |
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| 48 | unsigned was_enabled; |
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| 49 | |
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| 50 | if (id < 0 || id >= SPU_TIMER_NTIMERS) |
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| 51 | return SPU_TIMER_ERR_INVALID_ID; |
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| 52 | |
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| 53 | if (__spu_timers[id].state == SPU_TIMER_STOPPED) |
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| 54 | { |
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| 55 | |
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| 56 | was_enabled = spu_readch (SPU_RdMachStat) & 0x1; |
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| 57 | spu_idisable (); |
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| 58 | |
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| 59 | t = __spu_timers_stopped; |
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| 60 | pn = &__spu_timers_stopped; |
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| 61 | |
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| 62 | while (t && (t->id != id)) |
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| 63 | { |
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| 64 | pn = &t->next; |
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| 65 | t = t->next; |
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| 66 | } |
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| 67 | #ifdef SPU_TIMER_DEBUG |
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| 68 | if (!t) |
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| 69 | ABORT (); |
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| 70 | #endif |
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| 71 | *pn = t->next; |
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| 72 | |
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| 73 | /* Add timer back to free list (mask). */ |
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| 74 | __spu_timers_avail |= (1 << (id)); |
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| 75 | __spu_timers[id].state = SPU_TIMER_FREE; |
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| 76 | |
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| 77 | if (__likely (was_enabled)) |
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| 78 | spu_ienable (); |
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| 79 | |
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| 80 | return 0; |
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| 81 | } |
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| 82 | |
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| 83 | /* Handle invalid states. */ |
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| 84 | return (__spu_timers[id].state == SPU_TIMER_FREE) ? |
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| 85 | SPU_TIMER_ERR_FREE : SPU_TIMER_ERR_ACTIVE; |
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| 86 | } |
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