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 start and alloc library services. */ |
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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 | /* The timers. */ |
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36 | spu_timer_t __spu_timers[SPU_TIMER_NTIMERS] __attribute__ ((aligned (16))); |
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37 | |
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38 | /* Active timer list. */ |
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39 | spu_timer_t *__spu_timers_active; |
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40 | |
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41 | /* Stopped (allocated) timer list. */ |
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42 | spu_timer_t *__spu_timers_stopped; |
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43 | |
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44 | /* List of timers being handled. */ |
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45 | spu_timer_t *__spu_timers_handled; |
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46 | |
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47 | /* Bitmask of available timers. */ |
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48 | unsigned __spu_timers_avail = |
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49 | ((1 << (SPU_TIMER_NTIMERS - 1)) + ((1 << (SPU_TIMER_NTIMERS - 1)) - 1)); |
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50 | |
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51 | /* Allocates an SPU interval timer and returns the timer ID. Must be called |
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52 | before starting a timer. interval specifies the expiration interval in |
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53 | timebase units. func specifies the function pointer to expiration handler. |
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54 | Returns the timer ID on success or <0 on Failure: |
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55 | * SPU_TIMER_ERR_NONE_FREE - no free timers to allocate |
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56 | * SPU_TIMER_ERR_INVALID_PARM - invalid parm */ |
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57 | int |
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58 | spu_timer_alloc (int interval, void (*func) (int)) |
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59 | { |
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60 | unsigned was_enabled; |
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61 | int id; |
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62 | if (interval < MIN_INTVL || interval > MAX_INTVL || func == NULL) |
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63 | return SPU_TIMER_ERR_INVALID_PARM; |
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64 | |
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65 | was_enabled = spu_readch (SPU_RdMachStat) & 0x1; |
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66 | |
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67 | /* Get id of next available timer. */ |
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68 | id = spu_extract ((spu_sub ((unsigned) 31, |
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69 | spu_cntlz (spu_promote |
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70 | (__spu_timers_avail, 0)))), 0); |
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71 | |
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72 | /* No timers avail. */ |
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73 | if (id == -1) |
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74 | return SPU_TIMER_ERR_NONE_FREE; |
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75 | |
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76 | /* Higher order bits represent lower timer ids. */ |
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77 | __spu_timers_avail &= ~(1 << (id)); |
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78 | id = (SPU_TIMER_NTIMERS - 1) - id; |
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79 | |
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80 | /* Initialize timer and put it on stopped list. */ |
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81 | (__spu_timers + id)->func = func; |
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82 | (__spu_timers + id)->intvl = interval; |
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83 | (__spu_timers + id)->id = id; |
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84 | (__spu_timers + id)->state = SPU_TIMER_STOPPED; |
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85 | |
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86 | spu_idisable (); |
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87 | (__spu_timers + id)->next = __spu_timers_stopped; |
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88 | __spu_timers_stopped = &__spu_timers[id]; |
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89 | |
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90 | if (__likely (was_enabled)) |
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91 | spu_ienable (); |
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92 | return id; |
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93 | } |
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94 | |
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95 | /* External interface for starting a timer. See description of |
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96 | __spu_timer_start(). Returns 0 on success and <0 on failure: |
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97 | * SPU_TIMER_ERR_INVALID_ID - invalid id |
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98 | * SPU_TIMER_ERR_NOCLOCK - clock is off |
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99 | * SPU_TIMER_ERR_NOT_STOPPED - timer not in stopped state */ |
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100 | int |
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101 | spu_timer_start (int id) |
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102 | { |
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103 | if (id < 0 || id >= SPU_TIMER_NTIMERS) |
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104 | return SPU_TIMER_ERR_INVALID_ID; |
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105 | |
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106 | if (__spu_clock_startcnt == 0) |
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107 | return SPU_TIMER_ERR_NOCLOCK; |
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108 | |
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109 | if (__spu_timers[id].state != SPU_TIMER_STOPPED) |
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110 | return SPU_TIMER_ERR_NOT_STOPPED; |
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111 | |
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112 | __spu_timer_start (id, 1); |
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113 | |
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114 | return 0; |
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115 | } |
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