drivers: mailbox: Write data to the controller without sending
In addition to the requests that have to be sent to the remote processor
through the mailbox controller, there may be data, that may need to be
sent to the controller, but not the remote processor, atleast right
away. Such data need not be buffered by the mailbox framework. Since
data is also not sent to the remote processor immediately,
acknowlegement will not be expected by the mailbox framework.
Change-Id: I6b6e81f593af0ed1cadde269624ebfa2a1591f5b
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index 36029fb..6c7f6c4 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -281,6 +281,34 @@
}
EXPORT_SYMBOL_GPL(mbox_send_message);
+/**
+ * mbox_send_controller_data- For client to submit a message to be
+ * sent only to the controller.
+ * @chan: Mailbox channel assigned to this client.
+ * @mssg: Client specific message typecasted.
+ *
+ * For client to submit data to the controller. There is no ACK expected
+ * from the controller. This request is not buffered in the mailbox framework.
+ *
+ * Return: Non-negative integer for successful submission (non-blocking mode)
+ * or transmission over chan (blocking mode).
+ * Negative value denotes failure.
+ */
+int mbox_send_controller_data(struct mbox_chan *chan, void *mssg)
+{
+ unsigned long flags;
+ int err;
+
+ if (!chan || !chan->cl)
+ return -EINVAL;
+
+ spin_lock_irqsave(&chan->lock, flags);
+ err = chan->mbox->ops->send_controller_data(chan, mssg);
+ spin_unlock_irqrestore(&chan->lock, flags);
+
+ return err;
+}
+EXPORT_SYMBOL(mbox_send_controller_data);
bool mbox_controller_is_idle(struct mbox_chan *chan)
{