1#-
2# Copyright (c) 2006 M. Warner Losh
3# All rights reserved.
4#
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions
7# are met:
8# 1. Redistributions of source code must retain the above copyright
9#    notice, this list of conditions and the following disclaimer.
10# 2. Redistributions in binary form must reproduce the above copyright
11#    notice, this list of conditions and the following disclaimer in the
12#    documentation and/or other materials provided with the distribution.
13#
14# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24# SUCH DAMAGE.
25#
26# Portions of this software may have been developed with reference to
27# the SD Simplified Specification.  The following disclaimer may apply:
28#
29# The following conditions apply to the release of the simplified
30# specification ("Simplified Specification") by the SD Card Association and
31# the SD Group. The Simplified Specification is a subset of the complete SD
32# Specification which is owned by the SD Card Association and the SD
33# Group. This Simplified Specification is provided on a non-confidential
34# basis subject to the disclaimers below. Any implementation of the
35# Simplified Specification may require a license from the SD Card
36# Association, SD Group, SD-3C LLC or other third parties.
37#
38# Disclaimers:
39#
40# The information contained in the Simplified Specification is presented only
41# as a standard specification for SD Cards and SD Host/Ancillary products and
42# is provided "AS-IS" without any representations or warranties of any
43# kind. No responsibility is assumed by the SD Group, SD-3C LLC or the SD
44# Card Association for any damages, any infringements of patents or other
45# right of the SD Group, SD-3C LLC, the SD Card Association or any third
46# parties, which may result from its use. No license is granted by
47# implication, estoppel or otherwise under any patent or other rights of the
48# SD Group, SD-3C LLC, the SD Card Association or any third party. Nothing
49# herein shall be construed as an obligation by the SD Group, the SD-3C LLC
50# or the SD Card Association to disclose or distribute any technical
51# information, know-how or other confidential information to any third party.
52#
53# $FreeBSD: stable/11/sys/dev/mmc/mmcbr_if.m 322119 2017-08-06 16:07:25Z marius $
54#
55
56#include <sys/types.h>
57#include <dev/mmc/mmcreg.h>
58
59#
60# This is the interface that a mmc bridge chip gives to the mmc bus
61# that attaches to the mmc bridge.
62#
63
64INTERFACE mmcbr;
65
66#
67# Default implementations of some methods.
68#
69CODE {
70	static int
71	null_switch_vccq(device_t brdev __unused, device_t reqdev __unused)
72	{
73
74		return (0);
75	}
76
77	static int
78	null_retune(device_t brdev __unused, device_t reqdev __unused,
79	    bool reset __unused)
80	{
81
82		return (0);
83	}
84
85	static int
86	null_tune(device_t brdev __unused, device_t reqdev __unused,
87	    bool hs400 __unused)
88	{
89
90		return (0);
91	}
92};
93
94#
95# Called by the mmcbus to set up the IO pins correctly, the common/core
96# supply voltage (VDD/VCC) to use for the device, the clock frequency, the
97# type of SPI chip select, power mode and bus width.
98#
99METHOD int update_ios {
100	device_t	brdev;
101	device_t	reqdev;
102};
103
104#
105# Called by the mmcbus to switch the signaling voltage (VCCQ).
106#
107METHOD int switch_vccq {
108	device_t	brdev;
109	device_t	reqdev;
110} DEFAULT null_switch_vccq;
111
112#
113# Called by the mmcbus with the bridge claimed to execute initial tuning.
114#
115METHOD int tune {
116	device_t	brdev;
117	device_t	reqdev;
118	bool		hs400;
119} DEFAULT null_tune;
120
121#
122# Called by the mmcbus with the bridge claimed to execute re-tuning.
123#
124METHOD int retune {
125	device_t	brdev;
126	device_t	reqdev;
127	bool		reset;
128} DEFAULT null_retune;
129
130#
131# Called by the mmcbus or its children to schedule a mmc request.  These
132# requests are queued.  Time passes.  The bridge then gets notification
133# of the status of the request, who then notifies the requesting device
134# by calling the completion function supplied as part of the request.
135# Requires the bridge to be claimed.
136#
137METHOD int request {
138	device_t	brdev;
139	device_t	reqdev;
140	struct mmc_request *req;
141};
142
143#
144# Called by mmcbus to get the read only status bits.
145#
146METHOD int get_ro {
147	device_t	brdev;
148	device_t	reqdev;
149};
150
151#
152# Claim the current bridge, blocking the current thread until the host
153# is no longer busy.
154#
155METHOD int acquire_host {
156	device_t	brdev;
157	device_t	reqdev;
158};
159
160#
161# Release the current bridge.
162#
163METHOD int release_host {
164	device_t	brdev;
165	device_t	reqdev;
166};
167