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 * $FreeBSD$
28 */
29
30#include "opt_platform.h"
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD$");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/bus.h>
38#include <sys/conf.h>
39#include <sys/kernel.h>
40#include <sys/lock.h>
41#include <sys/mbuf.h>
42#include <sys/malloc.h>
43#include <sys/module.h>
44#include <sys/mutex.h>
45#include <sys/rman.h>
46#include <machine/bus.h>
47
48#ifdef FDT
49#include <dev/ofw/ofw_bus.h>
50#include <dev/ofw/ofw_bus_subr.h>
51#endif
52
53struct opal_i2cm_softc
54{
55
56};
57
58static int opal_i2cm_attach(device_t);
59static int opal_i2cm_probe(device_t);
60static const struct ofw_bus_devinfo *
61    opal_i2cm_get_devinfo(device_t, device_t);
62
63static device_method_t opal_i2cm_methods[] = {
64	/* Device interface */
65	DEVMETHOD(device_probe,		opal_i2cm_probe),
66	DEVMETHOD(device_attach,	opal_i2cm_attach),
67
68	/* ofw_bus interface */
69	DEVMETHOD(ofw_bus_get_devinfo,	opal_i2cm_get_devinfo),
70	DEVMETHOD(ofw_bus_get_compat,	ofw_bus_gen_get_compat),
71	DEVMETHOD(ofw_bus_get_model,	ofw_bus_gen_get_model),
72	DEVMETHOD(ofw_bus_get_name,	ofw_bus_gen_get_name),
73	DEVMETHOD(ofw_bus_get_node,	ofw_bus_gen_get_node),
74	DEVMETHOD(ofw_bus_get_type,	ofw_bus_gen_get_type),
75
76	DEVMETHOD_END
77};
78
79static devclass_t opal_i2cm_devclass;
80
81static int
82opal_i2cm_probe(device_t dev)
83{
84
85	if (!(ofw_bus_is_compatible(dev, "ibm,centaur-i2cm") ||
86	    ofw_bus_is_compatible(dev, "ibm,power8-i2cm")))
87		return (ENXIO);
88
89	device_set_desc(dev, "centaur-i2cm");
90	return (0);
91}
92
93static int
94opal_i2cm_attach(device_t dev)
95{
96	phandle_t child;
97	device_t cdev;
98	struct ofw_bus_devinfo *dinfo;
99
100	for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
101	    child = OF_peer(child)) {
102		dinfo = malloc(sizeof(*dinfo), M_DEVBUF, M_WAITOK | M_ZERO);
103		if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) {
104			free(dinfo, M_DEVBUF);
105			continue;
106		}
107		cdev = device_add_child(dev, NULL, -1);
108		if (cdev == NULL) {
109			device_printf(dev, "<%s>: device_add_child failed\n",
110			    dinfo->obd_name);
111			ofw_bus_gen_destroy_devinfo(dinfo);
112			free(dinfo, M_DEVBUF);
113			continue;
114		}
115		device_set_ivars(cdev, dinfo);
116	}
117
118	return (bus_generic_attach(dev));
119}
120
121static const struct ofw_bus_devinfo *
122opal_i2cm_get_devinfo(device_t dev, device_t child)
123{
124        return (device_get_ivars(child));
125}
126
127DEFINE_CLASS_0(opal_i2cm, opal_i2cm_driver, opal_i2cm_methods,
128    sizeof(struct opal_i2cm_softc));
129DRIVER_MODULE(opal_i2cm, powernv_xscom, opal_i2cm_driver, opal_i2cm_devclass, NULL,
130    NULL);
131DRIVER_MODULE(opal_i2cm, powernv_centaur, opal_i2cm_driver, opal_i2cm_devclass, NULL,
132    NULL);
133