1 /*-
2 * Copyright (c) 2017-2018 QCM Technologies.
3 * Copyright (c) 2017-2018 Semihalf.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include "opt_platform.h"
29
30 #include <sys/cdefs.h>
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/bus.h>
34 #include <sys/conf.h>
35 #include <sys/kernel.h>
36 #include <sys/lock.h>
37 #include <sys/mbuf.h>
38 #include <sys/malloc.h>
39 #include <sys/module.h>
40 #include <sys/mutex.h>
41 #include <sys/rman.h>
42 #include <machine/bus.h>
43
44 #ifdef FDT
45 #include <dev/ofw/ofw_bus.h>
46 #include <dev/ofw/ofw_bus_subr.h>
47 #endif
48
49 struct opal_i2cm_softc
50 {
51
52 };
53
54 static int opal_i2cm_attach(device_t);
55 static int opal_i2cm_probe(device_t);
56 static const struct ofw_bus_devinfo *
57 opal_i2cm_get_devinfo(device_t, device_t);
58
59 static device_method_t opal_i2cm_methods[] = {
60 /* Device interface */
61 DEVMETHOD(device_probe, opal_i2cm_probe),
62 DEVMETHOD(device_attach, opal_i2cm_attach),
63
64 /* ofw_bus interface */
65 DEVMETHOD(ofw_bus_get_devinfo, opal_i2cm_get_devinfo),
66 DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
67 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
68 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
69 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
70 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
71
72 DEVMETHOD_END
73 };
74
75 static devclass_t opal_i2cm_devclass;
76
77 static int
opal_i2cm_probe(device_t dev)78 opal_i2cm_probe(device_t dev)
79 {
80
81 if (!(ofw_bus_is_compatible(dev, "ibm,centaur-i2cm") ||
82 ofw_bus_is_compatible(dev, "ibm,power8-i2cm")))
83 return (ENXIO);
84
85 device_set_desc(dev, "centaur-i2cm");
86 return (0);
87 }
88
89 static int
opal_i2cm_attach(device_t dev)90 opal_i2cm_attach(device_t dev)
91 {
92 phandle_t child;
93 device_t cdev;
94 struct ofw_bus_devinfo *dinfo;
95
96 for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
97 child = OF_peer(child)) {
98 dinfo = malloc(sizeof(*dinfo), M_DEVBUF, M_WAITOK | M_ZERO);
99 if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) {
100 free(dinfo, M_DEVBUF);
101 continue;
102 }
103 cdev = device_add_child(dev, NULL, -1);
104 if (cdev == NULL) {
105 device_printf(dev, "<%s>: device_add_child failed\n",
106 dinfo->obd_name);
107 ofw_bus_gen_destroy_devinfo(dinfo);
108 free(dinfo, M_DEVBUF);
109 continue;
110 }
111 device_set_ivars(cdev, dinfo);
112 }
113
114 return (bus_generic_attach(dev));
115 }
116
117 static const struct ofw_bus_devinfo *
opal_i2cm_get_devinfo(device_t dev,device_t child)118 opal_i2cm_get_devinfo(device_t dev, device_t child)
119 {
120 return (device_get_ivars(child));
121 }
122
123 DEFINE_CLASS_0(opal_i2cm, opal_i2cm_driver, opal_i2cm_methods,
124 sizeof(struct opal_i2cm_softc));
125 DRIVER_MODULE(opal_i2cm, powernv_xscom, opal_i2cm_driver, opal_i2cm_devclass, NULL,
126 NULL);
127 DRIVER_MODULE(opal_i2cm, powernv_centaur, opal_i2cm_driver, opal_i2cm_devclass, NULL,
128 NULL);
129