1 /*-
2 * Copyright (c) 2009, Nathan Whitehorn <nwhitehorn@FreeBSD.org>
3 * Copyright (c) 2013 The FreeBSD Foundation
4 * All rights reserved.
5 *
6 * Portions of this software were developed by Oleksandr Rybalko
7 * under sponsorship from the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice unmodified, this list of conditions, and the following
14 * disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD: releng/11.1/sys/dev/spibus/ofw_spibus.c 300712 2016-05-26 06:37:33Z adrian $");
33
34 #include <sys/param.h>
35 #include <sys/bus.h>
36 #include <sys/kernel.h>
37 #include <sys/libkern.h>
38 #include <sys/lock.h>
39 #include <sys/module.h>
40 #include <sys/mutex.h>
41
42 #include <dev/fdt/fdt_common.h>
43 #include <dev/spibus/spi.h>
44 #include <dev/spibus/spibusvar.h>
45 #include <dev/ofw/ofw_bus.h>
46 #include <dev/ofw/ofw_bus_subr.h>
47 #include <dev/ofw/openfirm.h>
48
49 #include "spibus_if.h"
50
51 struct ofw_spibus_devinfo {
52 struct spibus_ivar opd_dinfo;
53 struct ofw_bus_devinfo opd_obdinfo;
54 };
55
56 /* Methods */
57 static device_probe_t ofw_spibus_probe;
58 static device_attach_t ofw_spibus_attach;
59 static device_t ofw_spibus_add_child(device_t dev, u_int order,
60 const char *name, int unit);
61 static const struct ofw_bus_devinfo *ofw_spibus_get_devinfo(device_t bus,
62 device_t dev);
63
64 static int
65 ofw_spibus_probe(device_t dev)
66 {
67
68 if (ofw_bus_get_node(dev) == -1)
69 return (ENXIO);
70 device_set_desc(dev, "OFW SPI bus");
71
72 return (0);
73 }
74
75 static int
76 ofw_spibus_attach(device_t dev)
77 {
78 struct spibus_softc *sc = device_get_softc(dev);
79 struct ofw_spibus_devinfo *dinfo;
80 phandle_t child;
81 pcell_t clock, paddr;
82 device_t childdev;
83
84 sc->dev = dev;
85
86 bus_generic_probe(dev);
87 bus_enumerate_hinted_children(dev);
88
89 /*
90 * Attach those children represented in the device tree.
91 */
92 for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
93 child = OF_peer(child)) {
94 /*
95 * Try to get the CS number first from the spi-chipselect
96 * property, then try the reg property.
97 */
98 if (OF_getencprop(child, "spi-chipselect", &paddr,
99 sizeof(paddr)) == -1) {
100 if (OF_getencprop(child, "reg", &paddr,
101 sizeof(paddr)) == -1)
102 continue;
103 }
104
105 /*
106 * Get the maximum clock frequency for device, zero means
107 * use the default bus speed.
108 */
109 if (OF_getencprop(child, "spi-max-frequency", &clock,
110 sizeof(clock)) == -1)
111 clock = 0;
112
113 /*
114 * Now set up the SPI and OFW bus layer devinfo and add it
115 * to the bus.
116 */
117 dinfo = malloc(sizeof(struct ofw_spibus_devinfo), M_DEVBUF,
118 M_NOWAIT | M_ZERO);
119 if (dinfo == NULL)
120 continue;
121 dinfo->opd_dinfo.cs = paddr;
122 dinfo->opd_dinfo.clock = clock;
123 if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
124 0) {
125 free(dinfo, M_DEVBUF);
126 continue;
127 }
128 childdev = device_add_child(dev, NULL, -1);
129 device_set_ivars(childdev, dinfo);
130 }
131
132 return (bus_generic_attach(dev));
133 }
134
135 static device_t
136 ofw_spibus_add_child(device_t dev, u_int order, const char *name, int unit)
137 {
138 device_t child;
139 struct ofw_spibus_devinfo *devi;
140
141 child = device_add_child_ordered(dev, order, name, unit);
142 if (child == NULL)
143 return (child);
144 devi = malloc(sizeof(struct ofw_spibus_devinfo), M_DEVBUF,
145 M_NOWAIT | M_ZERO);
146 if (devi == NULL) {
147 device_delete_child(dev, child);
148 return (0);
149 }
150
151 /*
152 * NULL all the OFW-related parts of the ivars for non-OFW
153 * children.
154 */
155 devi->opd_obdinfo.obd_node = -1;
156 devi->opd_obdinfo.obd_name = NULL;
157 devi->opd_obdinfo.obd_compat = NULL;
158 devi->opd_obdinfo.obd_type = NULL;
159 devi->opd_obdinfo.obd_model = NULL;
160
161 device_set_ivars(child, devi);
162
163 return (child);
164 }
165
166 static const struct ofw_bus_devinfo *
167 ofw_spibus_get_devinfo(device_t bus, device_t dev)
168 {
169 struct ofw_spibus_devinfo *dinfo;
170
171 dinfo = device_get_ivars(dev);
172 return (&dinfo->opd_obdinfo);
173 }
174
175 static device_method_t ofw_spibus_methods[] = {
176 /* Device interface */
177 DEVMETHOD(device_probe, ofw_spibus_probe),
178 DEVMETHOD(device_attach, ofw_spibus_attach),
179
180 /* Bus interface */
181 DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
182 DEVMETHOD(bus_add_child, ofw_spibus_add_child),
183
184 /* ofw_bus interface */
185 DEVMETHOD(ofw_bus_get_devinfo, ofw_spibus_get_devinfo),
186 DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
187 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
188 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
189 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
190 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
191
192 DEVMETHOD_END
193 };
194
195 static devclass_t ofwspibus_devclass;
196
197 DEFINE_CLASS_1(spibus, ofw_spibus_driver, ofw_spibus_methods,
198 sizeof(struct spibus_softc), spibus_driver);
199 DRIVER_MODULE(ofw_spibus, spi, ofw_spibus_driver, ofwspibus_devclass, 0, 0);
200 MODULE_VERSION(ofw_spibus, 1);
201 MODULE_DEPEND(ofw_spibus, spibus, 1, 1, 1);
Cache object: 3ee9c690b6ceefd80532502ba5276a09
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