1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2013-2014 Linaro Ltd.
4 * Author: Jassi Brar <jassisinghbrar@gmail.com>
5 */
6
7 #ifndef __MAILBOX_CLIENT_H
8 #define __MAILBOX_CLIENT_H
9
10 #include <linux/of.h>
11 #include <linux/device.h>
12
13 struct mbox_chan;
14
15 /**
16 * struct mbox_client - User of a mailbox
17 * @dev: The client device
18 * @tx_block: If the mbox_send_message should block until data is
19 * transmitted.
20 * @tx_tout: Max block period in ms before TX is assumed failure
21 * @knows_txdone: If the client could run the TX state machine. Usually
22 * if the client receives some ACK packet for transmission.
23 * Unused if the controller already has TX_Done/RTR IRQ.
24 * @rx_callback: Atomic callback to provide client the data received
25 * @tx_prepare: Atomic callback to ask client to prepare the payload
26 * before initiating the transmission if required.
27 * @tx_done: Atomic callback to tell client of data transmission
28 */
29 struct mbox_client {
30 struct device *dev;
31 bool tx_block;
32 unsigned long tx_tout;
33 bool knows_txdone;
34
35 void (*rx_callback)(struct mbox_client *cl, void *mssg);
36 void (*tx_prepare)(struct mbox_client *cl, void *mssg);
37 void (*tx_done)(struct mbox_client *cl, void *mssg, int r);
38 };
39
40 struct mbox_chan *mbox_request_channel_byname(struct mbox_client *cl,
41 const char *name);
42 struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index);
43 int mbox_send_message(struct mbox_chan *chan, void *mssg);
44 int mbox_flush(struct mbox_chan *chan, unsigned long timeout);
45 void mbox_client_txdone(struct mbox_chan *chan, int r); /* atomic */
46 bool mbox_client_peek_data(struct mbox_chan *chan); /* atomic */
47 void mbox_free_channel(struct mbox_chan *chan); /* may sleep */
48
49 #endif /* __MAILBOX_CLIENT_H */