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 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 | /* Stop a timer. Moves it from either the active or handled list to the |
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36 | stopped list. Returns 0 on sucess, timer was successfully stopped. |
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37 | Returns <0 - Failure: |
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38 | * SPU_TIMER_ERR_NOT_ACTIVE - timer was not active |
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39 | * SPU_TIMER_ERR_INVALID_ID - invalid timer id |
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40 | * SPU_TIMER_ERR_NOCLOCK - spu clock is not running */ |
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41 | int |
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42 | spu_timer_stop (int id) |
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43 | { |
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44 | spu_timer_t *t, **pn; |
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45 | unsigned was_enabled; |
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46 | |
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47 | if (id < 0 || id >= SPU_TIMER_NTIMERS) |
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48 | return SPU_TIMER_ERR_INVALID_ID; |
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49 | |
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50 | if (__spu_clock_startcnt == 0) |
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51 | return SPU_TIMER_ERR_NOCLOCK; |
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52 | |
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53 | |
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54 | /* Free or stopped states. */ |
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55 | if (__spu_timers[id].state == SPU_TIMER_ACTIVE || |
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56 | __spu_timers[id].state == SPU_TIMER_HANDLED) |
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57 | { |
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58 | was_enabled = spu_readch (SPU_RdMachStat) & 0x1; |
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59 | spu_idisable (); |
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60 | |
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61 | /* Timer is on either active list or handled list. */ |
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62 | t = (__spu_timers[id].state == SPU_TIMER_ACTIVE) |
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63 | ? __spu_timers_active : __spu_timers_handled; |
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64 | |
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65 | pn = (__spu_timers[id].state == SPU_TIMER_ACTIVE) |
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66 | ? &__spu_timers_active : &__spu_timers_handled; |
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67 | |
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68 | while (t && t->id != id) |
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69 | { |
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70 | pn = &t->next; |
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71 | t = t->next; |
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72 | } |
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73 | #ifdef SPU_TIMER_DEBUG |
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74 | if (!t) |
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75 | ABORT (); /* Internal error. */ |
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76 | #endif |
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77 | /* Fix timeout of next timer and decrementer if we were at the head of |
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78 | the active list. */ |
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79 | if (t->next) |
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80 | { |
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81 | t->next->tmout += t->tmout; |
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82 | if (__spu_timers_active == t) |
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83 | __reset_spu_decr (t->next->tmout); |
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84 | } |
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85 | else |
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86 | __reset_spu_decr (CLOCK_START_VALUE); |
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87 | |
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88 | *pn = t->next; /* Update this elements to pointer. */ |
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89 | t->next = __spu_timers_stopped; |
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90 | __spu_timers_stopped = t; |
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91 | |
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92 | __spu_timers[id].state = SPU_TIMER_STOPPED; |
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93 | |
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94 | if (__likely (was_enabled)) |
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95 | spu_ienable (); |
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96 | |
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97 | return 0; |
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98 | } |
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99 | |
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100 | return SPU_TIMER_ERR_NOT_ACTIVE; |
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101 | } |
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