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mailbox: Introduce framework for mailbox

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Introduce common framework for client/protocol drivers and
controller drivers of Inter-Processor-Communication (IPC).

Client driver developers should have a look at
 include/linux/mailbox_client.h to understand the part of
the API exposed to client drivers.
Similarly controller driver developers should have a look
at include/linux/mailbox_controller.h

Reviewed-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Jassi Brar 2014-06-12 22:31:19 +05:30
parent f2fc42b6ac
commit 2b6d83e2b8
5 changed files with 656 additions and 0 deletions
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46
include/linux/mailbox_client.h Normal file
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/*
* Copyright (C) 2013-2014 Linaro Ltd.
* Author: Jassi Brar <jassisinghbrar@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __MAILBOX_CLIENT_H
#define __MAILBOX_CLIENT_H
#include <linux/of.h>
#include <linux/device.h>
struct mbox_chan;
/**
* struct mbox_client - User of a mailbox
* @dev: The client device
* @tx_block: If the mbox_send_message should block until data is
* transmitted.
* @tx_tout: Max block period in ms before TX is assumed failure
* @knows_txdone: If the client could run the TX state machine. Usually
* if the client receives some ACK packet for transmission.
* Unused if the controller already has TX_Done/RTR IRQ.
* @rx_callback: Atomic callback to provide client the data received
* @tx_done: Atomic callback to tell client of data transmission
*/
struct mbox_client {
struct device *dev;
bool tx_block;
unsigned long tx_tout;
bool knows_txdone;
void (*rx_callback)(struct mbox_client *cl, void *mssg);
void (*tx_done)(struct mbox_client *cl, void *mssg, int r);
};
struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index);
int mbox_send_message(struct mbox_chan *chan, void *mssg);
void mbox_client_txdone(struct mbox_chan *chan, int r); /* atomic */
bool mbox_client_peek_data(struct mbox_chan *chan); /* atomic */
void mbox_free_channel(struct mbox_chan *chan); /* may sleep */
#endif /* __MAILBOX_CLIENT_H */