ofw_cpu.c revision 227843 
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 Benno Rice ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: head/sys/powerpc/ofw/ofw_cpu.c 227843 2011-11-22 21:28:20Z marius $");
28
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/kernel.h>
32#include <sys/module.h>
33#include <sys/malloc.h>
34#include <sys/bus.h>
35#include <sys/cpu.h>
36#include <machine/bus.h>
37
38#include <dev/ofw/openfirm.h>
39#include <dev/ofw/ofw_bus.h>
40#include <dev/ofw/ofw_bus_subr.h>
41
42static int	ofw_cpulist_probe(device_t);
43static int	ofw_cpulist_attach(device_t);
44static const struct ofw_bus_devinfo *ofw_cpulist_get_devinfo(device_t dev,
45    device_t child);
46
47static MALLOC_DEFINE(M_OFWCPU, "ofwcpu", "OFW CPU device information");
48
49static device_method_t ofw_cpulist_methods[] = {
50	/* Device interface */
51	DEVMETHOD(device_probe,		ofw_cpulist_probe),
52	DEVMETHOD(device_attach,	ofw_cpulist_attach),
53
54	/* Bus interface */
55	DEVMETHOD(bus_add_child,	bus_generic_add_child),
56	DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
57
58	/* ofw_bus interface */
59	DEVMETHOD(ofw_bus_get_devinfo,	ofw_cpulist_get_devinfo),
60	DEVMETHOD(ofw_bus_get_compat,	ofw_bus_gen_get_compat),
61	DEVMETHOD(ofw_bus_get_model,	ofw_bus_gen_get_model),
62	DEVMETHOD(ofw_bus_get_name,	ofw_bus_gen_get_name),
63	DEVMETHOD(ofw_bus_get_node,	ofw_bus_gen_get_node),
64	DEVMETHOD(ofw_bus_get_type,	ofw_bus_gen_get_type),
65
66	DEVMETHOD_END
67};
68
69static driver_t ofw_cpulist_driver = {
70	"cpulist",
71	ofw_cpulist_methods,
72	0
73};
74
75static devclass_t ofw_cpulist_devclass;
76
77DRIVER_MODULE(ofw_cpulist, nexus, ofw_cpulist_driver, ofw_cpulist_devclass,
78    0, 0);
79
80static int
81ofw_cpulist_probe(device_t dev)
82{
83	const char	*name;
84
85	name = ofw_bus_get_name(dev);
86
87	if (name == NULL || strcmp(name, "cpus") != 0)
88		return (ENXIO);
89
90	device_set_desc(dev, "Open Firmware CPU Group");
91
92	return (0);
93}
94
95static int
96ofw_cpulist_attach(device_t dev)
97{
98	phandle_t root, child;
99	device_t cdev;
100	struct ofw_bus_devinfo *dinfo;
101
102	root = ofw_bus_get_node(dev);
103
104	for (child = OF_child(root); child != 0; child = OF_peer(child)) {
105		dinfo = malloc(sizeof(*dinfo), M_OFWCPU, M_WAITOK | M_ZERO);
106
107                if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) {
108                        free(dinfo, M_OFWCPU);
109                        continue;
110                }
111                cdev = device_add_child(dev, NULL, -1);
112                if (cdev == NULL) {
113                        device_printf(dev, "<%s>: device_add_child failed\n",
114                            dinfo->obd_name);
115                        ofw_bus_gen_destroy_devinfo(dinfo);
116                        free(dinfo, M_OFWCPU);
117                        continue;
118                }
119		device_set_ivars(cdev, dinfo);
120	}
121
122	return (bus_generic_attach(dev));
123}
124
125static const struct ofw_bus_devinfo *
126ofw_cpulist_get_devinfo(device_t dev, device_t child)
127{
128	return (device_get_ivars(child));
129}
130
131static int	ofw_cpu_probe(device_t);
132static int	ofw_cpu_attach(device_t);
133static int	ofw_cpu_read_ivar(device_t dev, device_t child, int index,
134    uintptr_t *result);
135
136static device_method_t ofw_cpu_methods[] = {
137	/* Device interface */
138	DEVMETHOD(device_probe,		ofw_cpu_probe),
139	DEVMETHOD(device_attach,	ofw_cpu_attach),
140
141	/* Bus interface */
142	DEVMETHOD(bus_add_child,	bus_generic_add_child),
143	DEVMETHOD(bus_read_ivar,	ofw_cpu_read_ivar),
144	DEVMETHOD(bus_setup_intr,	bus_generic_setup_intr),
145	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),
146	DEVMETHOD(bus_alloc_resource,	bus_generic_alloc_resource),
147	DEVMETHOD(bus_release_resource,	bus_generic_release_resource),
148	DEVMETHOD(bus_activate_resource,bus_generic_activate_resource),
149
150	DEVMETHOD_END
151};
152
153static driver_t ofw_cpu_driver = {
154	"cpu",
155	ofw_cpu_methods,
156	0
157};
158
159static devclass_t ofw_cpu_devclass;
160
161DRIVER_MODULE(ofw_cpu, cpulist, ofw_cpu_driver, ofw_cpu_devclass, 0, 0);
162
163static int
164ofw_cpu_probe(device_t dev)
165{
166	const char *type = ofw_bus_get_type(dev);
167
168	if (strcmp(type, "cpu") != 0)
169		return (ENXIO);
170
171	device_set_desc(dev, "Open Firmware CPU");
172	return (0);
173}
174
175static int
176ofw_cpu_attach(device_t dev)
177{
178	bus_generic_probe(dev);
179	return (bus_generic_attach(dev));
180}
181
182static int
183ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
184{
185	uint32_t cell;
186
187	switch (index) {
188	case CPU_IVAR_PCPU:
189		OF_getprop(ofw_bus_get_node(dev), "reg", &cell, sizeof(cell));
190		*result = (uintptr_t)(pcpu_find(cell));
191		return (0);
192	case CPU_IVAR_NOMINAL_MHZ:
193		cell = 0;
194		OF_getprop(ofw_bus_get_node(dev), "clock-frequency",
195		    &cell, sizeof(cell));
196		cell /= 1000000; /* convert to MHz */
197		*result = (uintptr_t)(cell);
198		return (0);
199	}
200
201	return (ENOENT);
202}
203
204