xref: /freebsd/sys/dev/mmc/mmcbr_if.m (revision 031beb4e239bfce798af17f5fe8dba8bcaf13d99)

#-
# Copyright (c) 2006 M. Warner Losh <imp@FreeBSD.org>
#
# 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.
#
# Portions of this software may have been developed with reference to
# the SD Simplified Specification.  The following disclaimer may apply:
#
# The following conditions apply to the release of the simplified
# specification ("Simplified Specification") by the SD Card Association and
# the SD Group. The Simplified Specification is a subset of the complete SD
# Specification which is owned by the SD Card Association and the SD
# Group. This Simplified Specification is provided on a non-confidential
# basis subject to the disclaimers below. Any implementation of the
# Simplified Specification may require a license from the SD Card
# Association, SD Group, SD-3C LLC or other third parties.
#
# Disclaimers:
#
# The information contained in the Simplified Specification is presented only
# as a standard specification for SD Cards and SD Host/Ancillary products and
# is provided "AS-IS" without any representations or warranties of any
# kind. No responsibility is assumed by the SD Group, SD-3C LLC or the SD
# Card Association for any damages, any infringements of patents or other
# right of the SD Group, SD-3C LLC, the SD Card Association or any third
# parties, which may result from its use. No license is granted by
# implication, estoppel or otherwise under any patent or other rights of the
# SD Group, SD-3C LLC, the SD Card Association or any third party. Nothing
# herein shall be construed as an obligation by the SD Group, the SD-3C LLC
# or the SD Card Association to disclose or distribute any technical
# information, know-how or other confidential information to any third party.
#
#

#include <sys/types.h>
#include <dev/mmc/mmcreg.h>

#
# This is the interface that a mmc bridge chip gives to the mmc bus
# that attaches to the mmc bridge.
#

INTERFACE mmcbr;

#
# Default implementations of some methods.
#
CODE {
	static int
	null_switch_vccq(device_t brdev __unused, device_t reqdev __unused)
	{

		return (0);
	}

	static int
	null_retune(device_t brdev __unused, device_t reqdev __unused,
	    bool reset __unused)
	{

		return (0);
	}

	static int
	null_tune(device_t brdev __unused, device_t reqdev __unused,
	    bool hs400 __unused)
	{

		return (0);
	}
};

#
# Called by the mmcbus to set up the IO pins correctly, the common/core
# supply voltage (VDD/VCC) to use for the device, the clock frequency, the
# type of SPI chip select, power mode and bus width.
#
METHOD int update_ios {
	device_t	brdev;
	device_t	reqdev;
};

#
# Called by the mmcbus to switch the signaling voltage (VCCQ).
#
METHOD int switch_vccq {
	device_t	brdev;
	device_t	reqdev;
} DEFAULT null_switch_vccq;

#
# Called by the mmcbus with the bridge claimed to execute initial tuning.
#
METHOD int tune {
	device_t	brdev;
	device_t	reqdev;
	bool		hs400;
} DEFAULT null_tune;

#
# Called by the mmcbus with the bridge claimed to execute re-tuning.
#
METHOD int retune {
	device_t	brdev;
	device_t	reqdev;
	bool		reset;
} DEFAULT null_retune;

#
# Called by the mmcbus or its children to schedule a mmc request.  These
# requests are queued.  Time passes.  The bridge then gets notification
# of the status of the request, who then notifies the requesting device
# by calling the completion function supplied as part of the request.
# Requires the bridge to be claimed.
#
METHOD int request {
	device_t	brdev;
	device_t	reqdev;
	struct mmc_request *req;
};

#
# Called by mmcbus to get the read only status bits.
#
METHOD int get_ro {
	device_t	brdev;
	device_t	reqdev;
};

#
# Claim the current bridge, blocking the current thread until the host
# is no longer busy.
#
METHOD int acquire_host {
	device_t	brdev;
	device_t	reqdev;
};

#
# Release the current bridge.
#
METHOD int release_host {
	device_t	brdev;
	device_t	reqdev;
};