ofw_cpu.c revision 275815 
1/*-
2 * Copyright (C) 2009 Nathan Whitehorn
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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/dev/ofw/ofw_cpu.c 275815 2014-12-15 22:20:14Z emaste $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/module.h>
34#include <sys/malloc.h>
35#include <sys/bus.h>
36#include <sys/cpu.h>
37#include <machine/bus.h>
38
39#include <dev/ofw/openfirm.h>
40#include <dev/ofw/ofw_bus.h>
41#include <dev/ofw/ofw_bus_subr.h>
42
43static int	ofw_cpulist_probe(device_t);
44static int	ofw_cpulist_attach(device_t);
45static const struct ofw_bus_devinfo *ofw_cpulist_get_devinfo(device_t dev,
46    device_t child);
47
48static MALLOC_DEFINE(M_OFWCPU, "ofwcpu", "OFW CPU device information");
49
50static device_method_t ofw_cpulist_methods[] = {
51	/* Device interface */
52	DEVMETHOD(device_probe,		ofw_cpulist_probe),
53	DEVMETHOD(device_attach,	ofw_cpulist_attach),
54
55	/* Bus interface */
56	DEVMETHOD(bus_add_child,	bus_generic_add_child),
57	DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
58
59	/* ofw_bus interface */
60	DEVMETHOD(ofw_bus_get_devinfo,	ofw_cpulist_get_devinfo),
61	DEVMETHOD(ofw_bus_get_compat,	ofw_bus_gen_get_compat),
62	DEVMETHOD(ofw_bus_get_model,	ofw_bus_gen_get_model),
63	DEVMETHOD(ofw_bus_get_name,	ofw_bus_gen_get_name),
64	DEVMETHOD(ofw_bus_get_node,	ofw_bus_gen_get_node),
65	DEVMETHOD(ofw_bus_get_type,	ofw_bus_gen_get_type),
66
67	DEVMETHOD_END
68};
69
70static driver_t ofw_cpulist_driver = {
71	"cpulist",
72	ofw_cpulist_methods,
73	0
74};
75
76static devclass_t ofw_cpulist_devclass;
77
78DRIVER_MODULE(ofw_cpulist, ofwbus, ofw_cpulist_driver, ofw_cpulist_devclass,
79    0, 0);
80
81static int
82ofw_cpulist_probe(device_t dev)
83{
84	const char	*name;
85
86	name = ofw_bus_get_name(dev);
87
88	if (name == NULL || strcmp(name, "cpus") != 0)
89		return (ENXIO);
90
91	device_set_desc(dev, "Open Firmware CPU Group");
92
93	return (0);
94}
95
96static int
97ofw_cpulist_attach(device_t dev)
98{
99	phandle_t root, child;
100	device_t cdev;
101	struct ofw_bus_devinfo *dinfo;
102
103	root = ofw_bus_get_node(dev);
104
105	for (child = OF_child(root); child != 0; child = OF_peer(child)) {
106		dinfo = malloc(sizeof(*dinfo), M_OFWCPU, M_WAITOK | M_ZERO);
107
108                if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) {
109                        free(dinfo, M_OFWCPU);
110                        continue;
111                }
112                cdev = device_add_child(dev, NULL, -1);
113                if (cdev == NULL) {
114                        device_printf(dev, "<%s>: device_add_child failed\n",
115                            dinfo->obd_name);
116                        ofw_bus_gen_destroy_devinfo(dinfo);
117                        free(dinfo, M_OFWCPU);
118                        continue;
119                }
120		device_set_ivars(cdev, dinfo);
121	}
122
123	return (bus_generic_attach(dev));
124}
125
126static const struct ofw_bus_devinfo *
127ofw_cpulist_get_devinfo(device_t dev, device_t child)
128{
129	return (device_get_ivars(child));
130}
131
132static int	ofw_cpu_probe(device_t);
133static int	ofw_cpu_attach(device_t);
134static int	ofw_cpu_read_ivar(device_t dev, device_t child, int index,
135    uintptr_t *result);
136
137struct ofw_cpu_softc {
138	struct pcpu	*sc_cpu_pcpu;
139	uint32_t	 sc_nominal_mhz;
140};
141
142static device_method_t ofw_cpu_methods[] = {
143	/* Device interface */
144	DEVMETHOD(device_probe,		ofw_cpu_probe),
145	DEVMETHOD(device_attach,	ofw_cpu_attach),
146
147	/* Bus interface */
148	DEVMETHOD(bus_add_child,	bus_generic_add_child),
149	DEVMETHOD(bus_read_ivar,	ofw_cpu_read_ivar),
150	DEVMETHOD(bus_setup_intr,	bus_generic_setup_intr),
151	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),
152	DEVMETHOD(bus_alloc_resource,	bus_generic_alloc_resource),
153	DEVMETHOD(bus_release_resource,	bus_generic_release_resource),
154	DEVMETHOD(bus_activate_resource,bus_generic_activate_resource),
155
156	DEVMETHOD_END
157};
158
159static driver_t ofw_cpu_driver = {
160	"cpu",
161	ofw_cpu_methods,
162	sizeof(struct ofw_cpu_softc)
163};
164
165static devclass_t ofw_cpu_devclass;
166
167DRIVER_MODULE(ofw_cpu, cpulist, ofw_cpu_driver, ofw_cpu_devclass, 0, 0);
168
169static int
170ofw_cpu_probe(device_t dev)
171{
172	const char *type = ofw_bus_get_type(dev);
173
174	if (strcmp(type, "cpu") != 0)
175		return (ENXIO);
176
177	device_set_desc(dev, "Open Firmware CPU");
178	return (0);
179}
180
181static int
182ofw_cpu_attach(device_t dev)
183{
184	struct ofw_cpu_softc *sc;
185	uint32_t cell;
186
187	sc = device_get_softc(dev);
188	OF_getprop(ofw_bus_get_node(dev), "reg", &cell, sizeof(cell));
189	sc->sc_cpu_pcpu = pcpu_find(cell);
190	OF_getprop(ofw_bus_get_node(dev), "clock-frequency", &cell, sizeof(cell));
191	sc->sc_nominal_mhz = cell / 1000000; /* convert to MHz */
192
193	bus_generic_probe(dev);
194	return (bus_generic_attach(dev));
195}
196
197static int
198ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
199{
200	struct ofw_cpu_softc *sc;
201
202	sc = device_get_softc(dev);
203
204	switch (index) {
205	case CPU_IVAR_PCPU:
206		*result = (uintptr_t)sc->sc_cpu_pcpu;
207		return (0);
208	case CPU_IVAR_NOMINAL_MHZ:
209		*result = (uintptr_t)sc->sc_nominal_mhz;
210		return (0);
211	}
212
213	return (ENOENT);
214}
215
216