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clock: Add ClockEvent parameter to callbacks

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The Clock framework allows users to specify a callback which is
called after the clock's period has been updated.  Some users need to
also have a callback which is called before the clock period is
updated.

As the first step in adding support for notifying Clock users on
pre-update events, add an argument to the ClockCallback to specify
what event is being notified, and add an argument to the various
functions for registering a callback to specify which events are
of interest to that callback.

Note that the documentation update renders correct the previously
incorrect claim in 'Adding a new clock' that callbacks "will be
explained in a following section".

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Luc Michel <luc@lmichel.fr>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210219144617.4782-2-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-02-19 14:45:34 +00:00
parent 0436c55edf
commit 5ee0abed51
20 changed files with 161 additions and 58 deletions
Download patch file Download diff file Expand all files Collapse all files

21
hw/core/clock.c
View file

@ -39,15 +39,17 @@ Clock *clock_new(Object *parent, const char *name)
return clk;
}
void clock_set_callback(Clock *clk, ClockCallback *cb, void *opaque)
void clock_set_callback(Clock *clk, ClockCallback *cb, void *opaque,
unsigned int events)
{
clk->callback = cb;
clk->callback_opaque = opaque;
clk->callback_events = events;
}
void clock_clear_callback(Clock *clk)
{
clock_set_callback(clk, NULL, NULL);
clock_set_callback(clk, NULL, NULL, 0);
}
bool clock_set(Clock *clk, uint64_t period)
@ -62,6 +64,17 @@ bool clock_set(Clock *clk, uint64_t period)
return true;
}
static void clock_call_callback(Clock *clk, ClockEvent event)
{
/*
* Call the Clock's callback for this event, if it has one and
* is interested in this event.
*/
if (clk->callback && (clk->callback_events & event)) {
clk->callback(clk->callback_opaque, event);
}
}
static void clock_propagate_period(Clock *clk, bool call_callbacks)
{
Clock *child;
@ -72,8 +85,8 @@ static void clock_propagate_period(Clock *clk, bool call_callbacks)
trace_clock_update(CLOCK_PATH(child), CLOCK_PATH(clk),
CLOCK_PERIOD_TO_HZ(clk->period),
call_callbacks);
if (call_callbacks && child->callback) {
child->callback(child->callback_opaque);
if (call_callbacks) {
clock_call_callback(child, ClockUpdate);
}
clock_propagate_period(child, call_callbacks);
}