hw/i386: Remove the deprecated pc-1.x machine types
[qemu/ar7.git] / hw / core / clock.c
blob76b5f468b6ec1f7d3a4ef959f2c3e70bd0572c42
1 /*
2 * Hardware Clocks
4 * Copyright GreenSocs 2016-2020
6 * Authors:
7 * Frederic Konrad
8 * Damien Hedde
10 * This work is licensed under the terms of the GNU GPL, version 2 or later.
11 * See the COPYING file in the top-level directory.
14 #include "qemu/osdep.h"
15 #include "qemu/cutils.h"
16 #include "hw/clock.h"
17 #include "trace.h"
19 #define CLOCK_PATH(_clk) (_clk->canonical_path)
21 void clock_setup_canonical_path(Clock *clk)
23 g_free(clk->canonical_path);
24 clk->canonical_path = object_get_canonical_path(OBJECT(clk));
27 Clock *clock_new(Object *parent, const char *name)
29 Object *obj;
30 Clock *clk;
32 obj = object_new(TYPE_CLOCK);
33 object_property_add_child(parent, name, obj);
34 object_unref(obj);
36 clk = CLOCK(obj);
37 clock_setup_canonical_path(clk);
39 return clk;
42 void clock_set_callback(Clock *clk, ClockCallback *cb, void *opaque)
44 clk->callback = cb;
45 clk->callback_opaque = opaque;
48 void clock_clear_callback(Clock *clk)
50 clock_set_callback(clk, NULL, NULL);
53 bool clock_set(Clock *clk, uint64_t period)
55 if (clk->period == period) {
56 return false;
58 trace_clock_set(CLOCK_PATH(clk), CLOCK_PERIOD_TO_HZ(clk->period),
59 CLOCK_PERIOD_TO_HZ(period));
60 clk->period = period;
62 return true;
65 static void clock_propagate_period(Clock *clk, bool call_callbacks)
67 Clock *child;
69 QLIST_FOREACH(child, &clk->children, sibling) {
70 if (child->period != clk->period) {
71 child->period = clk->period;
72 trace_clock_update(CLOCK_PATH(child), CLOCK_PATH(clk),
73 CLOCK_PERIOD_TO_HZ(clk->period),
74 call_callbacks);
75 if (call_callbacks && child->callback) {
76 child->callback(child->callback_opaque);
78 clock_propagate_period(child, call_callbacks);
83 void clock_propagate(Clock *clk)
85 assert(clk->source == NULL);
86 trace_clock_propagate(CLOCK_PATH(clk));
87 clock_propagate_period(clk, true);
90 void clock_set_source(Clock *clk, Clock *src)
92 /* changing clock source is not supported */
93 assert(!clk->source);
95 trace_clock_set_source(CLOCK_PATH(clk), CLOCK_PATH(src));
97 clk->period = src->period;
98 QLIST_INSERT_HEAD(&src->children, clk, sibling);
99 clk->source = src;
100 clock_propagate_period(clk, false);
103 static void clock_disconnect(Clock *clk)
105 if (clk->source == NULL) {
106 return;
109 trace_clock_disconnect(CLOCK_PATH(clk));
111 clk->source = NULL;
112 QLIST_REMOVE(clk, sibling);
115 char *clock_display_freq(Clock *clk)
117 return freq_to_str(clock_get_hz(clk));
120 static void clock_initfn(Object *obj)
122 Clock *clk = CLOCK(obj);
124 QLIST_INIT(&clk->children);
127 static void clock_finalizefn(Object *obj)
129 Clock *clk = CLOCK(obj);
130 Clock *child, *next;
132 /* clear our list of children */
133 QLIST_FOREACH_SAFE(child, &clk->children, sibling, next) {
134 clock_disconnect(child);
137 /* remove us from source's children list */
138 clock_disconnect(clk);
140 g_free(clk->canonical_path);
143 static const TypeInfo clock_info = {
144 .name = TYPE_CLOCK,
145 .parent = TYPE_OBJECT,
146 .instance_size = sizeof(Clock),
147 .instance_init = clock_initfn,
148 .instance_finalize = clock_finalizefn,
151 static void clock_register_types(void)
153 type_register_static(&clock_info);
156 type_init(clock_register_types)