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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

8
hw/core/qdev-clock.c
View file

@ -111,7 +111,8 @@ Clock *qdev_init_clock_out(DeviceState *dev, const char *name)
}
Clock *qdev_init_clock_in(DeviceState *dev, const char *name,
ClockCallback *callback, void *opaque)
ClockCallback *callback, void *opaque,
unsigned int events)
{
NamedClockList *ncl;
@ -120,7 +121,7 @@ Clock *qdev_init_clock_in(DeviceState *dev, const char *name,
ncl = qdev_init_clocklist(dev, name, false, NULL);
if (callback) {
clock_set_callback(ncl->clock, callback, opaque);
clock_set_callback(ncl->clock, callback, opaque, events);
}
return ncl->clock;
}
@ -137,7 +138,8 @@ void qdev_init_clocks(DeviceState *dev, const ClockPortInitArray clocks)
if (elem->is_output) {
*clkp = qdev_init_clock_out(dev, elem->name);
} else {
*clkp = qdev_init_clock_in(dev, elem->name, elem->callback, dev);
*clkp = qdev_init_clock_in(dev, elem->name, elem->callback, dev,
elem->callback_events);
}
}
}