siba_bhndb.c revision 298479 
1/*-
2 * Copyright (c) 2015 Landon Fuller <landon@landonf.org>
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 *    without modification.
11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12 *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
13 *    redistribution must be conditioned upon including a substantially
14 *    similar Disclaimer requirement for further binary redistribution.
15 *
16 * NO WARRANTY
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27 * THE POSSIBILITY OF SUCH DAMAGES.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: head/sys/dev/bhnd/siba/siba_bhndb.c 298479 2016-04-22 16:26:53Z adrian $");
32
33#include <sys/param.h>
34#include <sys/kernel.h>
35#include <sys/bus.h>
36#include <sys/module.h>
37
38#include <dev/bhnd/bhnd_ids.h>
39#include <dev/bhnd/bhndb/bhndbvar.h>
40#include <dev/bhnd/bhndb/bhndb_hwdata.h>
41
42#include "sibavar.h"
43
44/*
45 * Supports attachment of siba(4) bus devices via a bhndb bridge.
46 */
47
48//
49// TODO: PCI rev < 6 interrupt handling
50//
51// On early PCI cores (rev < 6) interrupt masking is handled via interconnect
52// configuration registers (SBINTVEC), rather than the PCI_INT_MASK
53// config register.
54//
55// On those devices, we should handle interrupts locally using SBINTVEC, rather
56// than delegating to our parent bhndb device.
57//
58
59static int
60siba_bhndb_probe(device_t dev)
61{
62	const struct bhnd_chipid *cid;
63
64	/* Check bus type */
65	cid = BHNDB_GET_CHIPID(device_get_parent(dev), dev);
66	if (cid->chip_type != BHND_CHIPTYPE_SIBA)
67		return (ENXIO);
68
69	/* Delegate to default probe implementation */
70	return (siba_probe(dev));
71}
72
73static int
74siba_bhndb_attach(device_t dev)
75{
76	const struct bhnd_chipid	*chipid;
77	int				 error;
78
79	/* Enumerate our children. */
80	chipid = BHNDB_GET_CHIPID(device_get_parent(dev), dev);
81	if ((error = siba_add_children(dev, chipid)))
82		return (error);
83
84	/* Initialize full bridge configuration */
85	error = BHNDB_INIT_FULL_CONFIG(device_get_parent(dev), dev,
86	    bhndb_siba_priority_table);
87	if (error)
88		return (error);
89
90	/* Call our superclass' implementation */
91	return (siba_attach(dev));
92}
93
94/* Suspend all references to the device's cfg register blocks */
95static void
96siba_bhndb_suspend_cfgblocks(device_t dev, struct siba_devinfo *dinfo) {
97	for (u_int i = 0; i < dinfo->core_id.num_cfg_blocks; i++) {
98		if (dinfo->cfg[i] == NULL)
99			continue;
100
101		BHNDB_SUSPEND_RESOURCE(device_get_parent(dev), dev,
102		    SYS_RES_MEMORY, dinfo->cfg[i]->res);
103	}
104}
105
106static int
107siba_bhndb_suspend_child(device_t dev, device_t child)
108{
109	struct siba_devinfo	*dinfo;
110	int			 error;
111
112	if (device_get_parent(child) != dev)
113		BUS_SUSPEND_CHILD(device_get_parent(dev), child);
114
115	dinfo = device_get_ivars(child);
116
117	/* Suspend the child */
118	if ((error = bhnd_generic_br_suspend_child(dev, child)))
119		return (error);
120
121	/* Suspend resource references to the child's config registers */
122	siba_bhndb_suspend_cfgblocks(dev, dinfo);
123
124	return (0);
125}
126
127static int
128siba_bhndb_resume_child(device_t dev, device_t child)
129{
130	struct siba_devinfo	*dinfo;
131	int			 error;
132
133	if (device_get_parent(child) != dev)
134		BUS_SUSPEND_CHILD(device_get_parent(dev), child);
135
136	if (!device_is_suspended(child))
137		return (EBUSY);
138
139	dinfo = device_get_ivars(child);
140
141	/* Resume all resource references to the child's config registers */
142	for (u_int i = 0; i < dinfo->core_id.num_cfg_blocks; i++) {
143		if (dinfo->cfg[i] == NULL)
144			continue;
145
146		error = BHNDB_RESUME_RESOURCE(device_get_parent(dev), dev,
147		    SYS_RES_MEMORY, dinfo->cfg[i]->res);
148		if (error) {
149			siba_bhndb_suspend_cfgblocks(dev, dinfo);
150			return (error);
151		}
152	}
153
154	/* Resume the child */
155	if ((error = bhnd_generic_br_resume_child(dev, child))) {
156		siba_bhndb_suspend_cfgblocks(dev, dinfo);
157		return (error);
158	}
159
160	return (0);
161}
162
163static device_method_t siba_bhndb_methods[] = {
164	/* Device interface */
165	DEVMETHOD(device_probe,			siba_bhndb_probe),
166	DEVMETHOD(device_attach,		siba_bhndb_attach),
167
168	/* Bus interface */
169	DEVMETHOD(bus_suspend_child,		siba_bhndb_suspend_child),
170	DEVMETHOD(bus_resume_child,		siba_bhndb_resume_child),
171
172	DEVMETHOD_END
173};
174
175DEFINE_CLASS_1(bhnd, siba_bhndb_driver, siba_bhndb_methods,
176    sizeof(struct siba_softc), siba_driver);
177
178DRIVER_MODULE(siba_bhndb, bhndb, siba_bhndb_driver, bhnd_devclass, NULL, NULL);
179
180MODULE_VERSION(siba_bhndb, 1);
181MODULE_DEPEND(siba_bhndb, siba, 1, 1, 1);
182MODULE_DEPEND(siba_bhndb, bhndb, 1, 1, 1);