| /* |
| (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 timer start and alloc library services. */ |
| #include <spu_timer.h> |
| #include "spu_timer_internal.h" |
| |
| /* The timers. */ |
| spu_timer_t __spu_timers[SPU_TIMER_NTIMERS] __attribute__ ((aligned (16))); |
| |
| /* Active timer list. */ |
| spu_timer_t *__spu_timers_active; |
| |
| /* Stopped (allocated) timer list. */ |
| spu_timer_t *__spu_timers_stopped; |
| |
| /* List of timers being handled. */ |
| spu_timer_t *__spu_timers_handled; |
| |
| /* Bitmask of available timers. */ |
| unsigned __spu_timers_avail = |
| ((1 << (SPU_TIMER_NTIMERS - 1)) + ((1 << (SPU_TIMER_NTIMERS - 1)) - 1)); |
| |
| /* Allocates an SPU interval timer and returns the timer ID. Must be called |
| before starting a timer. interval specifies the expiration interval in |
| timebase units. func specifies the function pointer to expiration handler. |
| Returns the timer ID on success or <0 on Failure: |
| * SPU_TIMER_ERR_NONE_FREE - no free timers to allocate |
| * SPU_TIMER_ERR_INVALID_PARM - invalid parm */ |
| int |
| spu_timer_alloc (int interval, void (*func) (int)) |
| { |
| unsigned was_enabled; |
| int id; |
| if (interval < MIN_INTVL || interval > MAX_INTVL || func == NULL) |
| return SPU_TIMER_ERR_INVALID_PARM; |
| |
| was_enabled = spu_readch (SPU_RdMachStat) & 0x1; |
| |
| /* Get id of next available timer. */ |
| id = spu_extract ((spu_sub ((unsigned) 31, |
| spu_cntlz (spu_promote |
| (__spu_timers_avail, 0)))), 0); |
| |
| /* No timers avail. */ |
| if (id == -1) |
| return SPU_TIMER_ERR_NONE_FREE; |
| |
| /* Higher order bits represent lower timer ids. */ |
| __spu_timers_avail &= ~(1 << (id)); |
| id = (SPU_TIMER_NTIMERS - 1) - id; |
| |
| /* Initialize timer and put it on stopped list. */ |
| (__spu_timers + id)->func = func; |
| (__spu_timers + id)->intvl = interval; |
| (__spu_timers + id)->id = id; |
| (__spu_timers + id)->state = SPU_TIMER_STOPPED; |
| |
| spu_idisable (); |
| (__spu_timers + id)->next = __spu_timers_stopped; |
| __spu_timers_stopped = &__spu_timers[id]; |
| |
| if (__likely (was_enabled)) |
| spu_ienable (); |
| return id; |
| } |
| |
| /* External interface for starting a timer. See description of |
| __spu_timer_start(). Returns 0 on success and <0 on failure: |
| * SPU_TIMER_ERR_INVALID_ID - invalid id |
| * SPU_TIMER_ERR_NOCLOCK - clock is off |
| * SPU_TIMER_ERR_NOT_STOPPED - timer not in stopped state */ |
| int |
| spu_timer_start (int id) |
| { |
| if (id < 0 || id >= SPU_TIMER_NTIMERS) |
| return SPU_TIMER_ERR_INVALID_ID; |
| |
| if (__spu_clock_startcnt == 0) |
| return SPU_TIMER_ERR_NOCLOCK; |
| |
| if (__spu_timers[id].state != SPU_TIMER_STOPPED) |
| return SPU_TIMER_ERR_NOT_STOPPED; |
| |
| __spu_timer_start (id, 1); |
| |
| return 0; |
| } |