ofw_cpu.c revision 277378 
1/*-
2 * Copyright (C) 2009 Nathan Whitehorn
3 * Copyright (C) 2015 The FreeBSD Foundation
4 * All rights reserved.
5 *
6 * Portions of this software were developed by Andrew Turner
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, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: head/sys/dev/ofw/ofw_cpu.c 277378 2015-01-19 11:06:56Z andrew $");
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/kernel.h>
37#include <sys/module.h>
38#include <sys/malloc.h>
39#include <sys/bus.h>
40#include <sys/cpu.h>
41#include <machine/bus.h>
42
43#include <dev/ofw/openfirm.h>
44#include <dev/ofw/ofw_bus.h>
45#include <dev/ofw/ofw_bus_subr.h>
46
47static int	ofw_cpulist_probe(device_t);
48static int	ofw_cpulist_attach(device_t);
49static const struct ofw_bus_devinfo *ofw_cpulist_get_devinfo(device_t dev,
50    device_t child);
51
52static MALLOC_DEFINE(M_OFWCPU, "ofwcpu", "OFW CPU device information");
53
54static device_method_t ofw_cpulist_methods[] = {
55	/* Device interface */
56	DEVMETHOD(device_probe,		ofw_cpulist_probe),
57	DEVMETHOD(device_attach,	ofw_cpulist_attach),
58
59	/* Bus interface */
60	DEVMETHOD(bus_add_child,	bus_generic_add_child),
61	DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
62
63	/* ofw_bus interface */
64	DEVMETHOD(ofw_bus_get_devinfo,	ofw_cpulist_get_devinfo),
65	DEVMETHOD(ofw_bus_get_compat,	ofw_bus_gen_get_compat),
66	DEVMETHOD(ofw_bus_get_model,	ofw_bus_gen_get_model),
67	DEVMETHOD(ofw_bus_get_name,	ofw_bus_gen_get_name),
68	DEVMETHOD(ofw_bus_get_node,	ofw_bus_gen_get_node),
69	DEVMETHOD(ofw_bus_get_type,	ofw_bus_gen_get_type),
70
71	DEVMETHOD_END
72};
73
74static driver_t ofw_cpulist_driver = {
75	"cpulist",
76	ofw_cpulist_methods,
77	0
78};
79
80static devclass_t ofw_cpulist_devclass;
81
82DRIVER_MODULE(ofw_cpulist, ofwbus, ofw_cpulist_driver, ofw_cpulist_devclass,
83    0, 0);
84
85static int
86ofw_cpulist_probe(device_t dev)
87{
88	const char	*name;
89
90	name = ofw_bus_get_name(dev);
91
92	if (name == NULL || strcmp(name, "cpus") != 0)
93		return (ENXIO);
94
95	device_set_desc(dev, "Open Firmware CPU Group");
96
97	return (0);
98}
99
100static int
101ofw_cpulist_attach(device_t dev)
102{
103	phandle_t root, child;
104	device_t cdev;
105	struct ofw_bus_devinfo *dinfo;
106
107	root = ofw_bus_get_node(dev);
108
109	for (child = OF_child(root); child != 0; child = OF_peer(child)) {
110		dinfo = malloc(sizeof(*dinfo), M_OFWCPU, M_WAITOK | M_ZERO);
111
112                if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) {
113                        free(dinfo, M_OFWCPU);
114                        continue;
115                }
116                cdev = device_add_child(dev, NULL, -1);
117                if (cdev == NULL) {
118                        device_printf(dev, "<%s>: device_add_child failed\n",
119                            dinfo->obd_name);
120                        ofw_bus_gen_destroy_devinfo(dinfo);
121                        free(dinfo, M_OFWCPU);
122                        continue;
123                }
124		device_set_ivars(cdev, dinfo);
125	}
126
127	return (bus_generic_attach(dev));
128}
129
130static const struct ofw_bus_devinfo *
131ofw_cpulist_get_devinfo(device_t dev, device_t child)
132{
133	return (device_get_ivars(child));
134}
135
136static int	ofw_cpu_probe(device_t);
137static int	ofw_cpu_attach(device_t);
138static int	ofw_cpu_read_ivar(device_t dev, device_t child, int index,
139    uintptr_t *result);
140
141struct ofw_cpu_softc {
142	struct pcpu	*sc_cpu_pcpu;
143	uint32_t	 sc_nominal_mhz;
144};
145
146static device_method_t ofw_cpu_methods[] = {
147	/* Device interface */
148	DEVMETHOD(device_probe,		ofw_cpu_probe),
149	DEVMETHOD(device_attach,	ofw_cpu_attach),
150
151	/* Bus interface */
152	DEVMETHOD(bus_add_child,	bus_generic_add_child),
153	DEVMETHOD(bus_read_ivar,	ofw_cpu_read_ivar),
154	DEVMETHOD(bus_setup_intr,	bus_generic_setup_intr),
155	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),
156	DEVMETHOD(bus_alloc_resource,	bus_generic_alloc_resource),
157	DEVMETHOD(bus_release_resource,	bus_generic_release_resource),
158	DEVMETHOD(bus_activate_resource,bus_generic_activate_resource),
159
160	DEVMETHOD_END
161};
162
163static driver_t ofw_cpu_driver = {
164	"cpu",
165	ofw_cpu_methods,
166	sizeof(struct ofw_cpu_softc)
167};
168
169static devclass_t ofw_cpu_devclass;
170
171DRIVER_MODULE(ofw_cpu, cpulist, ofw_cpu_driver, ofw_cpu_devclass, 0, 0);
172
173static int
174ofw_cpu_probe(device_t dev)
175{
176	const char *type = ofw_bus_get_type(dev);
177
178	if (type == NULL || strcmp(type, "cpu") != 0)
179		return (ENXIO);
180
181	device_set_desc(dev, "Open Firmware CPU");
182	return (0);
183}
184
185static int
186ofw_cpu_attach(device_t dev)
187{
188	struct ofw_cpu_softc *sc;
189	phandle_t node;
190	uint32_t cell;
191
192	sc = device_get_softc(dev);
193	node = ofw_bus_get_node(dev);
194	if (OF_getencprop(node, "reg", &cell, sizeof(cell)) < 0) {
195		cell = device_get_unit(dev);
196		device_printf(dev, "missing 'reg' property, using %u\n", cell);
197	}
198	sc->sc_cpu_pcpu = pcpu_find(cell);
199	if (OF_getencprop(node, "clock-frequency", &cell, sizeof(cell)) < 0) {
200		if (bootverbose)
201			device_printf(dev,
202			    "missing 'clock-frequency' property\n");
203	} else
204		sc->sc_nominal_mhz = cell / 1000000; /* convert to MHz */
205
206	bus_generic_probe(dev);
207	return (bus_generic_attach(dev));
208}
209
210static int
211ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
212{
213	struct ofw_cpu_softc *sc;
214
215	sc = device_get_softc(dev);
216
217	switch (index) {
218	case CPU_IVAR_PCPU:
219		*result = (uintptr_t)sc->sc_cpu_pcpu;
220		return (0);
221	case CPU_IVAR_NOMINAL_MHZ:
222		if (sc->sc_nominal_mhz > 0) {
223			*result = (uintptr_t)sc->sc_nominal_mhz;
224			return (0);
225		}
226		break;
227	}
228
229	return (ENOENT);
230}
231
232