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Add a mailbox interface.

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Mailboxes are an IPC mechanism found on several ARM architectures, namely
OMAP4, BCM2385, Sitara, etc.

Reviewed by:	gonzo
This commit is contained in:
Rui Paulo 2013-07-07 19:47:22 +00:00
parent 175a0c9859
commit 9a0c3479e2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=252998
1 changed files with 46 additions and 0 deletions
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sys/dev/mbox/mbox_if.m Normal file
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#-
# Copyright (c) 2013 Rui Paulo
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $FreeBSD$
#
# Mailboxes are used as an IPC mechanism that allows subsystems to
# communicate with each other.
# A system can have multiple mailboxes (e.g. OMAP4) but there's usually a
# system wide mailbox.
#
INTERFACE mbox;
METHOD int read {
device_t dev;
int channel;
uint32_t *data;
};
METHOD int write {
device_t dev;
int channel;
uint32_t data;
};