116 lines
3.9 KiB
C
116 lines
3.9 KiB
C
/*
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(C) Copyright IBM Corp. 2008
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of IBM nor the names of its contributors may be
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used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* SPU timer start and alloc library services. */
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#include <spu_timer.h>
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#include "spu_timer_internal.h"
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/* The timers. */
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spu_timer_t __spu_timers[SPU_TIMER_NTIMERS] __attribute__ ((aligned (16)));
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/* Active timer list. */
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spu_timer_t *__spu_timers_active;
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/* Stopped (allocated) timer list. */
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spu_timer_t *__spu_timers_stopped;
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/* List of timers being handled. */
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spu_timer_t *__spu_timers_handled;
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/* Bitmask of available timers. */
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unsigned __spu_timers_avail =
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((1 << (SPU_TIMER_NTIMERS - 1)) + ((1 << (SPU_TIMER_NTIMERS - 1)) - 1));
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/* Allocates an SPU interval timer and returns the timer ID. Must be called
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before starting a timer. interval specifies the expiration interval in
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timebase units. func specifies the function pointer to expiration handler.
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Returns the timer ID on success or <0 on Failure:
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* SPU_TIMER_ERR_NONE_FREE - no free timers to allocate
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* SPU_TIMER_ERR_INVALID_PARM - invalid parm */
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int
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spu_timer_alloc (int interval, void (*func) (int))
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{
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unsigned was_enabled;
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int id;
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if (interval < MIN_INTVL || interval > MAX_INTVL || func == NULL)
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return SPU_TIMER_ERR_INVALID_PARM;
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was_enabled = spu_readch (SPU_RdMachStat) & 0x1;
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/* Get id of next available timer. */
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id = spu_extract ((spu_sub ((unsigned) 31,
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spu_cntlz (spu_promote
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(__spu_timers_avail, 0)))), 0);
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/* No timers avail. */
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if (id == -1)
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return SPU_TIMER_ERR_NONE_FREE;
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/* Higher order bits represent lower timer ids. */
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__spu_timers_avail &= ~(1 << (id));
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id = (SPU_TIMER_NTIMERS - 1) - id;
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/* Initialize timer and put it on stopped list. */
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(__spu_timers + id)->func = func;
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(__spu_timers + id)->intvl = interval;
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(__spu_timers + id)->id = id;
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(__spu_timers + id)->state = SPU_TIMER_STOPPED;
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spu_idisable ();
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(__spu_timers + id)->next = __spu_timers_stopped;
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__spu_timers_stopped = &__spu_timers[id];
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if (__likely (was_enabled))
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spu_ienable ();
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return id;
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}
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/* External interface for starting a timer. See description of
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__spu_timer_start(). Returns 0 on success and <0 on failure:
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* SPU_TIMER_ERR_INVALID_ID - invalid id
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* SPU_TIMER_ERR_NOCLOCK - clock is off
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* SPU_TIMER_ERR_NOT_STOPPED - timer not in stopped state */
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int
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spu_timer_start (int id)
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{
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if (id < 0 || id >= SPU_TIMER_NTIMERS)
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return SPU_TIMER_ERR_INVALID_ID;
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if (__spu_clock_startcnt == 0)
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return SPU_TIMER_ERR_NOCLOCK;
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if (__spu_timers[id].state != SPU_TIMER_STOPPED)
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return SPU_TIMER_ERR_NOT_STOPPED;
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__spu_timer_start (id, 1);
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return 0;
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}
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