From: KONRAD Frederic <fred.kon...@greensocs.com>
This introduces the clock binding and the update part.
When the qemu_clk_rate_update(qemu_clk, int) function is called:
* The clock callback is called on the qemu_clk so it can change the rate.
* The qemu_clk_rate_update function is called on all the driven clock.
Signed-off-by: KONRAD Frederic <fred.kon...@greensocs.com>
V1 -> V2:
* Rename qemu_clk_on_rate_update_cb to QEMUClkRateUpdateCallback and
move the pointer to the structure instead of having a pointer-to-function
type.
---
include/qemu/qemu-clock.h | 67 +++++++++++++++++++++++++++++++++++++++++++++++
qemu-clock.c | 56 +++++++++++++++++++++++++++++++++++++++
2 files changed, 123 insertions(+)
diff --git a/include/qemu/qemu-clock.h b/include/qemu/qemu-clock.h
index 3e692d3..6d30299 100644
--- a/include/qemu/qemu-clock.h
+++ b/include/qemu/qemu-clock.h
@@ -30,12 +30,25 @@
#define TYPE_CLOCK "qemu-clk"
#define QEMU_CLOCK(obj) OBJECT_CHECK(struct qemu_clk, (obj), TYPE_CLOCK)
+typedef struct ClkList ClkList;
+typedef uint64_t QEMUClkRateUpdateCallback(void *opaque, uint64_t rate);
+
typedef struct qemu_clk {
/*< private >*/
Object parent_obj;
char *name; /* name of this clock in the device. */
+ uint64_t in_rate; /* rate of the clock which drive this pin. */
+ uint64_t out_rate; /* rate of this clock pin. */
+ void *opaque;
+ QEMUClkRateUpdateCallback *cb;
+ QLIST_HEAD(, ClkList) bound;
} *qemu_clk;
+struct ClkList {
+ qemu_clk clk;
+ QLIST_ENTRY(ClkList) node;
+};
+
/**
* qemu_clk_device_add_clock:
* @dev: the device on which the clock needs to be added.
@@ -59,4 +72,58 @@ void qemu_clk_device_add_clock(DeviceState *dev, qemu_clk
clk,
*/
qemu_clk qemu_clk_device_get_clock(DeviceState *dev, const char *name);
+/**
+ * qemu_clk_bind_clock:
+ * @out: the clock output.
+ * @in: the clock input.
+ *
+ * Connect the clock together. This is unidirectional so a
+ * qemu_clk_update_rate will go from @out to @in.
+ *
+ */
+void qemu_clk_bind_clock(qemu_clk out, qemu_clk in);
+
+/**
+ * qemu_clk_unbind:
+ * @out: the clock output.
+ * @in: the clock input.
+ *
+ * Disconnect the clocks if they were bound together.
+ *
+ */
+void qemu_clk_unbind(qemu_clk out, qemu_clk in);
+
+/**
+ * qemu_clk_update_rate:
+ * @clk: the clock to update.
+ * @rate: the new rate in Hz.
+ *
+ * Update the @clk to the new @rate.
+ *
+ */
+void qemu_clk_update_rate(qemu_clk clk, uint64_t rate);
+
+/**
+ * qemu_clk_refresh:
+ * @clk: the clock to be refreshed.
+ *
+ * If a model alters the topology of a clock tree, it must call this function
on
+ * the clock source to refresh the clock tree.
+ *
+ */
+void qemu_clk_refresh(qemu_clk clk);
+
+/**
+ * qemu_clk_set_callback:
+ * @clk: the clock associated to the callback.
+ * @cb: the function which is called when a refresh happen on the clock @clk.
+ * @opaque: the opaque data passed to the callback.
+ *
+ * Set the callback @cb which will be called when the clock @clk is updated.
+ *
+ */
+void qemu_clk_set_callback(qemu_clk clk,
+ QEMUClkRateUpdateCallback *cb,
+ void *opaque);
+
#endif /* QEMU_CLOCK_H */
diff --git a/qemu-clock.c b/qemu-clock.c
index 803deb3..8c12368 100644
--- a/qemu-clock.c
+++ b/qemu-clock.c
@@ -37,6 +37,62 @@
} \
} while (0);
+void qemu_clk_refresh(qemu_clk clk)
+{
+ qemu_clk_update_rate(clk, clk->in_rate);
+}
+
+void qemu_clk_update_rate(qemu_clk clk, uint64_t rate)
+{
+ ClkList *child;
+
+ clk->in_rate = rate;
+ clk->out_rate = rate;
+
+ if (clk->cb) {
+ clk->out_rate = clk->cb(clk->opaque, rate);
+ }
+
+ DPRINTF("%s output rate updated to %" PRIu64 "\n",
+ object_get_canonical_path(OBJECT(clk)),
+ clk->out_rate);
+
+ QLIST_FOREACH(child, &clk->bound, node) {
+ qemu_clk_update_rate(child->clk, clk->out_rate);
+ }
+}
+
+void qemu_clk_bind_clock(qemu_clk out, qemu_clk in)
+{
+ ClkList *child;
+
+ child = g_malloc(sizeof(child));
+ assert(child);
+ child->clk = in;
+ QLIST_INSERT_HEAD(&out->bound, child, node);
+ qemu_clk_update_rate(in, out->out_rate);
+}
+
+void qemu_clk_unbind(qemu_clk out, qemu_clk in)
+{
+ ClkList *child, *next;
+
+ QLIST_FOREACH_SAFE(child, &out->bound, node, next) {
+ if (child->clk == in) {
+ QLIST_REMOVE(child, node);
+ g_free(child);
+ }
+ }
+}
+
+void qemu_clk_set_callback(qemu_clk clk,
+ QEMUClkRateUpdateCallback *cb,
+ void *opaque)
+{
+ clk->cb = cb;
+ clk->opaque = opaque;
+}
+
void qemu_clk_device_add_clock(DeviceState *dev, qemu_clk clk,
const char *name)
{
--
1.8.3.1
