ofw_cpu.c revision 277491 
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 277491 2015-01-21 16:52:24Z 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
54struct ofw_cpulist_softc {
55	pcell_t	 sc_addr_cells;
56};
57
58static device_method_t ofw_cpulist_methods[] = {
59	/* Device interface */
60	DEVMETHOD(device_probe,		ofw_cpulist_probe),
61	DEVMETHOD(device_attach,	ofw_cpulist_attach),
62
63	/* Bus interface */
64	DEVMETHOD(bus_add_child,	bus_generic_add_child),
65	DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
66
67	/* ofw_bus interface */
68	DEVMETHOD(ofw_bus_get_devinfo,	ofw_cpulist_get_devinfo),
69	DEVMETHOD(ofw_bus_get_compat,	ofw_bus_gen_get_compat),
70	DEVMETHOD(ofw_bus_get_model,	ofw_bus_gen_get_model),
71	DEVMETHOD(ofw_bus_get_name,	ofw_bus_gen_get_name),
72	DEVMETHOD(ofw_bus_get_node,	ofw_bus_gen_get_node),
73	DEVMETHOD(ofw_bus_get_type,	ofw_bus_gen_get_type),
74
75	DEVMETHOD_END
76};
77
78static driver_t ofw_cpulist_driver = {
79	"cpulist",
80	ofw_cpulist_methods,
81	sizeof(struct ofw_cpulist_softc)
82};
83
84static devclass_t ofw_cpulist_devclass;
85
86DRIVER_MODULE(ofw_cpulist, ofwbus, ofw_cpulist_driver, ofw_cpulist_devclass,
87    0, 0);
88
89static int
90ofw_cpulist_probe(device_t dev)
91{
92	const char	*name;
93
94	name = ofw_bus_get_name(dev);
95
96	if (name == NULL || strcmp(name, "cpus") != 0)
97		return (ENXIO);
98
99	device_set_desc(dev, "Open Firmware CPU Group");
100
101	return (0);
102}
103
104static int
105ofw_cpulist_attach(device_t dev)
106{
107	struct ofw_cpulist_softc *sc;
108	phandle_t root, child;
109	device_t cdev;
110	struct ofw_bus_devinfo *dinfo;
111
112	sc = device_get_softc(dev);
113	root = ofw_bus_get_node(dev);
114
115	sc->sc_addr_cells = 1;
116	OF_getencprop(root, "#address-cells", &sc->sc_addr_cells,
117	    sizeof(sc->sc_addr_cells));
118
119	for (child = OF_child(root); child != 0; child = OF_peer(child)) {
120		dinfo = malloc(sizeof(*dinfo), M_OFWCPU, M_WAITOK | M_ZERO);
121
122                if (ofw_bus_gen_setup_devinfo(dinfo, child) != 0) {
123                        free(dinfo, M_OFWCPU);
124                        continue;
125                }
126                cdev = device_add_child(dev, NULL, -1);
127                if (cdev == NULL) {
128                        device_printf(dev, "<%s>: device_add_child failed\n",
129                            dinfo->obd_name);
130                        ofw_bus_gen_destroy_devinfo(dinfo);
131                        free(dinfo, M_OFWCPU);
132                        continue;
133                }
134		device_set_ivars(cdev, dinfo);
135	}
136
137	return (bus_generic_attach(dev));
138}
139
140static const struct ofw_bus_devinfo *
141ofw_cpulist_get_devinfo(device_t dev, device_t child)
142{
143	return (device_get_ivars(child));
144}
145
146static int	ofw_cpu_probe(device_t);
147static int	ofw_cpu_attach(device_t);
148static int	ofw_cpu_read_ivar(device_t dev, device_t child, int index,
149    uintptr_t *result);
150
151struct ofw_cpu_softc {
152	struct pcpu	*sc_cpu_pcpu;
153	uint32_t	 sc_nominal_mhz;
154	boolean_t	 sc_reg_valid;
155	pcell_t		 sc_reg[2];
156};
157
158static device_method_t ofw_cpu_methods[] = {
159	/* Device interface */
160	DEVMETHOD(device_probe,		ofw_cpu_probe),
161	DEVMETHOD(device_attach,	ofw_cpu_attach),
162
163	/* Bus interface */
164	DEVMETHOD(bus_add_child,	bus_generic_add_child),
165	DEVMETHOD(bus_read_ivar,	ofw_cpu_read_ivar),
166	DEVMETHOD(bus_setup_intr,	bus_generic_setup_intr),
167	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),
168	DEVMETHOD(bus_alloc_resource,	bus_generic_alloc_resource),
169	DEVMETHOD(bus_release_resource,	bus_generic_release_resource),
170	DEVMETHOD(bus_activate_resource,bus_generic_activate_resource),
171
172	DEVMETHOD_END
173};
174
175static driver_t ofw_cpu_driver = {
176	"cpu",
177	ofw_cpu_methods,
178	sizeof(struct ofw_cpu_softc)
179};
180
181static devclass_t ofw_cpu_devclass;
182
183DRIVER_MODULE(ofw_cpu, cpulist, ofw_cpu_driver, ofw_cpu_devclass, 0, 0);
184
185static int
186ofw_cpu_probe(device_t dev)
187{
188	const char *type = ofw_bus_get_type(dev);
189
190	if (type == NULL || strcmp(type, "cpu") != 0)
191		return (ENXIO);
192
193	device_set_desc(dev, "Open Firmware CPU");
194	return (0);
195}
196
197static int
198ofw_cpu_attach(device_t dev)
199{
200	struct ofw_cpulist_softc *psc;
201	struct ofw_cpu_softc *sc;
202	phandle_t node;
203	pcell_t cell;
204	int rv;
205
206	sc = device_get_softc(dev);
207	psc = device_get_softc(device_get_parent(dev));
208
209	if (nitems(sc->sc_reg) < psc->sc_addr_cells) {
210		if (bootverbose)
211			device_printf(dev, "Too many address cells\n");
212		return (EINVAL);
213	}
214
215	node = ofw_bus_get_node(dev);
216
217	/* Read and validate the reg property for use later */
218	sc->sc_reg_valid = false;
219	rv = OF_getencprop(node, "reg", sc->sc_reg, sizeof(sc->sc_reg));
220	if (rv < 0)
221		device_printf(dev, "missing 'reg' property\n");
222	else if ((rv % 4) != 0) {
223		if (bootverbose)
224			device_printf(dev, "Malformed reg property\n");
225	} else if ((rv / 4) != psc->sc_addr_cells) {
226		if (bootverbose)
227			device_printf(dev, "Invalid reg size %u\n", rv);
228	} else
229		sc->sc_reg_valid = true;
230
231	sc->sc_cpu_pcpu = pcpu_find(device_get_unit(dev));
232
233	if (OF_getencprop(node, "clock-frequency", &cell, sizeof(cell)) < 0) {
234		if (bootverbose)
235			device_printf(dev,
236			    "missing 'clock-frequency' property\n");
237	} else
238		sc->sc_nominal_mhz = cell / 1000000; /* convert to MHz */
239
240	bus_generic_probe(dev);
241	return (bus_generic_attach(dev));
242}
243
244static int
245ofw_cpu_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
246{
247	struct ofw_cpu_softc *sc;
248
249	sc = device_get_softc(dev);
250
251	switch (index) {
252	case CPU_IVAR_PCPU:
253		*result = (uintptr_t)sc->sc_cpu_pcpu;
254		return (0);
255	case CPU_IVAR_NOMINAL_MHZ:
256		if (sc->sc_nominal_mhz > 0) {
257			*result = (uintptr_t)sc->sc_nominal_mhz;
258			return (0);
259		}
260		break;
261	}
262
263	return (ENOENT);
264}
265
266