5ebc664800
This function creates a clock and parents it to another object with a given name. It calls clock_setup_canonical_path before returning the new clock. This function is useful to create clocks in devices when one doesn't want to expose it at the qdev level (as an input or an output). Suggested-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Luc Michel <luc@lmichel.fr> Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20201010135759.437903-4-luc@lmichel.fr> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
151 lines
3.3 KiB
C
151 lines
3.3 KiB
C
/*
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* Hardware Clocks
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*
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* Copyright GreenSocs 2016-2020
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*
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* Authors:
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* Frederic Konrad
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* Damien Hedde
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "hw/clock.h"
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#include "trace.h"
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#define CLOCK_PATH(_clk) (_clk->canonical_path)
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void clock_setup_canonical_path(Clock *clk)
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{
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g_free(clk->canonical_path);
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clk->canonical_path = object_get_canonical_path(OBJECT(clk));
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}
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Clock *clock_new(Object *parent, const char *name)
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{
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Object *obj;
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Clock *clk;
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obj = object_new(TYPE_CLOCK);
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object_property_add_child(parent, name, obj);
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object_unref(obj);
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clk = CLOCK(obj);
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clock_setup_canonical_path(clk);
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return clk;
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}
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void clock_set_callback(Clock *clk, ClockCallback *cb, void *opaque)
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{
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clk->callback = cb;
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clk->callback_opaque = opaque;
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}
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void clock_clear_callback(Clock *clk)
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{
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clock_set_callback(clk, NULL, NULL);
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}
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bool clock_set(Clock *clk, uint64_t period)
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{
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if (clk->period == period) {
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return false;
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}
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trace_clock_set(CLOCK_PATH(clk), CLOCK_PERIOD_TO_NS(clk->period),
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CLOCK_PERIOD_TO_NS(period));
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clk->period = period;
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return true;
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}
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static void clock_propagate_period(Clock *clk, bool call_callbacks)
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{
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Clock *child;
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QLIST_FOREACH(child, &clk->children, sibling) {
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if (child->period != clk->period) {
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child->period = clk->period;
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trace_clock_update(CLOCK_PATH(child), CLOCK_PATH(clk),
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CLOCK_PERIOD_TO_NS(clk->period),
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call_callbacks);
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if (call_callbacks && child->callback) {
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child->callback(child->callback_opaque);
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}
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clock_propagate_period(child, call_callbacks);
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}
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}
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}
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void clock_propagate(Clock *clk)
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{
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assert(clk->source == NULL);
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trace_clock_propagate(CLOCK_PATH(clk));
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clock_propagate_period(clk, true);
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}
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void clock_set_source(Clock *clk, Clock *src)
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{
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/* changing clock source is not supported */
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assert(!clk->source);
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trace_clock_set_source(CLOCK_PATH(clk), CLOCK_PATH(src));
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clk->period = src->period;
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QLIST_INSERT_HEAD(&src->children, clk, sibling);
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clk->source = src;
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clock_propagate_period(clk, false);
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}
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static void clock_disconnect(Clock *clk)
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{
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if (clk->source == NULL) {
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return;
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}
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trace_clock_disconnect(CLOCK_PATH(clk));
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clk->source = NULL;
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QLIST_REMOVE(clk, sibling);
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}
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static void clock_initfn(Object *obj)
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{
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Clock *clk = CLOCK(obj);
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QLIST_INIT(&clk->children);
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}
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static void clock_finalizefn(Object *obj)
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{
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Clock *clk = CLOCK(obj);
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Clock *child, *next;
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/* clear our list of children */
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QLIST_FOREACH_SAFE(child, &clk->children, sibling, next) {
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clock_disconnect(child);
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}
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/* remove us from source's children list */
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clock_disconnect(clk);
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g_free(clk->canonical_path);
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}
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static const TypeInfo clock_info = {
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.name = TYPE_CLOCK,
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.parent = TYPE_OBJECT,
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.instance_size = sizeof(Clock),
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.instance_init = clock_initfn,
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.instance_finalize = clock_finalizefn,
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};
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static void clock_register_types(void)
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{
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type_register_static(&clock_info);
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}
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type_init(clock_register_types)
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