mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 08:49:45 +00:00
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>
This commit is contained in:
parent
ad24bde8f1
commit
373fe0bdf9
2 changed files with 53 additions and 0 deletions
|
@ -237,6 +237,58 @@ struct omap_dm_timer *omap_dm_timer_request_specific(int id)
|
||||||
}
|
}
|
||||||
EXPORT_SYMBOL_GPL(omap_dm_timer_request_specific);
|
EXPORT_SYMBOL_GPL(omap_dm_timer_request_specific);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* omap_dm_timer_request_by_cap - Request a timer by capability
|
||||||
|
* @cap: Bit mask of capabilities to match
|
||||||
|
*
|
||||||
|
* Find a timer based upon capabilities bit mask. Callers of this function
|
||||||
|
* should use the definitions found in the plat/dmtimer.h file under the
|
||||||
|
* comment "timer capabilities used in hwmod database". Returns pointer to
|
||||||
|
* timer handle on success and a NULL pointer on failure.
|
||||||
|
*/
|
||||||
|
struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap)
|
||||||
|
{
|
||||||
|
struct omap_dm_timer *timer = NULL, *t;
|
||||||
|
unsigned long flags;
|
||||||
|
|
||||||
|
if (!cap)
|
||||||
|
return NULL;
|
||||||
|
|
||||||
|
spin_lock_irqsave(&dm_timer_lock, flags);
|
||||||
|
list_for_each_entry(t, &omap_timer_list, node) {
|
||||||
|
if ((!t->reserved) && ((t->capability & cap) == cap)) {
|
||||||
|
/*
|
||||||
|
* If timer is not NULL, we have already found one timer
|
||||||
|
* but it was not an exact match because it had more
|
||||||
|
* capabilites that what was required. Therefore,
|
||||||
|
* unreserve the last timer found and see if this one
|
||||||
|
* is a better match.
|
||||||
|
*/
|
||||||
|
if (timer)
|
||||||
|
timer->reserved = 0;
|
||||||
|
|
||||||
|
timer = t;
|
||||||
|
timer->reserved = 1;
|
||||||
|
|
||||||
|
/* Exit loop early if we find an exact match */
|
||||||
|
if (t->capability == cap)
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
spin_unlock_irqrestore(&dm_timer_lock, flags);
|
||||||
|
|
||||||
|
if (timer && omap_dm_timer_prepare(timer)) {
|
||||||
|
timer->reserved = 0;
|
||||||
|
timer = NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!timer)
|
||||||
|
pr_debug("%s: timer request failed!\n", __func__);
|
||||||
|
|
||||||
|
return timer;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(omap_dm_timer_request_by_cap);
|
||||||
|
|
||||||
int omap_dm_timer_free(struct omap_dm_timer *timer)
|
int omap_dm_timer_free(struct omap_dm_timer *timer)
|
||||||
{
|
{
|
||||||
if (unlikely(!timer))
|
if (unlikely(!timer))
|
||||||
|
|
|
@ -99,6 +99,7 @@ struct dmtimer_platform_data {
|
||||||
int omap_dm_timer_reserve_systimer(int id);
|
int omap_dm_timer_reserve_systimer(int id);
|
||||||
struct omap_dm_timer *omap_dm_timer_request(void);
|
struct omap_dm_timer *omap_dm_timer_request(void);
|
||||||
struct omap_dm_timer *omap_dm_timer_request_specific(int timer_id);
|
struct omap_dm_timer *omap_dm_timer_request_specific(int timer_id);
|
||||||
|
struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap);
|
||||||
int omap_dm_timer_free(struct omap_dm_timer *timer);
|
int omap_dm_timer_free(struct omap_dm_timer *timer);
|
||||||
void omap_dm_timer_enable(struct omap_dm_timer *timer);
|
void omap_dm_timer_enable(struct omap_dm_timer *timer);
|
||||||
void omap_dm_timer_disable(struct omap_dm_timer *timer);
|
void omap_dm_timer_disable(struct omap_dm_timer *timer);
|
||||||
|
|
Loading…
Reference in a new issue