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ARM: OMAP: Add function to request a timer by capability
Currently OMAP timers can be requested by requesting any available or by a numerical device ID. If a specific timer is required because it has a particular capability, such as can interrupt the on-chip DSP in addition to the ARM CPU, then the user needs to know the device ID of the timer with this feature. Therefore, add a new API called omap_dm_timer_request_by_cap() that allows drivers to request a timer by capability. Signed-off-by: Jon Hunter <jon-hunter@ti.com>
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2 changed files with 53 additions and 0 deletions
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@ -237,6 +237,58 @@ struct omap_dm_timer *omap_dm_timer_request_specific(int id)
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}
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EXPORT_SYMBOL_GPL(omap_dm_timer_request_specific);
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/**
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* omap_dm_timer_request_by_cap - Request a timer by capability
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* @cap: Bit mask of capabilities to match
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*
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* Find a timer based upon capabilities bit mask. Callers of this function
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* should use the definitions found in the plat/dmtimer.h file under the
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* comment "timer capabilities used in hwmod database". Returns pointer to
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* timer handle on success and a NULL pointer on failure.
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*/
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struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap)
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{
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struct omap_dm_timer *timer = NULL, *t;
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unsigned long flags;
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if (!cap)
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return NULL;
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spin_lock_irqsave(&dm_timer_lock, flags);
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list_for_each_entry(t, &omap_timer_list, node) {
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if ((!t->reserved) && ((t->capability & cap) == cap)) {
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/*
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* If timer is not NULL, we have already found one timer
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* but it was not an exact match because it had more
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* capabilites that what was required. Therefore,
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* unreserve the last timer found and see if this one
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* is a better match.
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*/
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if (timer)
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timer->reserved = 0;
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timer = t;
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timer->reserved = 1;
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/* Exit loop early if we find an exact match */
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if (t->capability == cap)
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break;
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}
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}
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spin_unlock_irqrestore(&dm_timer_lock, flags);
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if (timer && omap_dm_timer_prepare(timer)) {
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timer->reserved = 0;
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timer = NULL;
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}
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if (!timer)
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pr_debug("%s: timer request failed!\n", __func__);
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return timer;
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}
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EXPORT_SYMBOL_GPL(omap_dm_timer_request_by_cap);
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int omap_dm_timer_free(struct omap_dm_timer *timer)
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{
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if (unlikely(!timer))
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@ -99,6 +99,7 @@ struct dmtimer_platform_data {
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int omap_dm_timer_reserve_systimer(int id);
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struct omap_dm_timer *omap_dm_timer_request(void);
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struct omap_dm_timer *omap_dm_timer_request_specific(int timer_id);
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struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap);
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int omap_dm_timer_free(struct omap_dm_timer *timer);
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void omap_dm_timer_enable(struct omap_dm_timer *timer);
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void omap_dm_timer_disable(struct omap_dm_timer *timer);
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