2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2011 Justin Hibbits
5 * Copyright (c) 2009 Nathan Whitehorn
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/limits.h>
39 #include <sys/module.h>
41 #include <dev/ofw/ofw_bus.h>
42 #include <dev/ofw/openfirm.h>
44 #include "cpufreq_if.h"
45 #include "powerpc/powermac/pmuvar.h"
47 struct pmufreq_softc {
54 static void pmufreq_identify(driver_t *driver, device_t parent);
55 static int pmufreq_probe(device_t dev);
56 static int pmufreq_attach(device_t dev);
57 static int pmufreq_settings(device_t dev, struct cf_setting *sets, int *count);
58 static int pmufreq_set(device_t dev, const struct cf_setting *set);
59 static int pmufreq_get(device_t dev, struct cf_setting *set);
60 static int pmufreq_type(device_t dev, int *type);
62 static device_method_t pmufreq_methods[] = {
63 /* Device interface */
64 DEVMETHOD(device_identify, pmufreq_identify),
65 DEVMETHOD(device_probe, pmufreq_probe),
66 DEVMETHOD(device_attach, pmufreq_attach),
68 /* cpufreq interface */
69 DEVMETHOD(cpufreq_drv_set, pmufreq_set),
70 DEVMETHOD(cpufreq_drv_get, pmufreq_get),
71 DEVMETHOD(cpufreq_drv_type, pmufreq_type),
72 DEVMETHOD(cpufreq_drv_settings, pmufreq_settings),
77 static driver_t pmufreq_driver = {
80 sizeof(struct pmufreq_softc)
83 static devclass_t pmufreq_devclass;
84 DRIVER_MODULE(pmufreq, cpu, pmufreq_driver, pmufreq_devclass, 0, 0);
87 pmufreq_identify(driver_t *driver, device_t parent)
92 node = ofw_bus_get_node(parent);
93 if (OF_getprop(node, "min-clock-frequency", &min_freq, sizeof(min_freq)) == -1)
96 /* Make sure we're not being doubly invoked. */
97 if (device_find_child(parent, "pmufreq", -1) != NULL)
101 * We attach a child for every CPU since settings need to
102 * be performed on every CPU in the SMP case.
104 if (BUS_ADD_CHILD(parent, 10, "pmufreq", -1) == NULL)
105 device_printf(parent, "add pmufreq child failed\n");
109 pmufreq_probe(device_t dev)
111 struct pmufreq_softc *sc;
115 if (resource_disabled("pmufreq", 0))
118 sc = device_get_softc(dev);
119 node = ofw_bus_get_node(device_get_parent(dev));
121 * A scalable MPC7455 has min-clock-frequency/max-clock-frequency as OFW
122 * properties of the 'cpu' node.
124 if (OF_getprop(node, "min-clock-frequency", &min_freq, sizeof(min_freq)) == -1)
126 device_set_desc(dev, "PMU-based frequency scaling");
131 pmufreq_attach(device_t dev)
133 struct pmufreq_softc *sc;
136 sc = device_get_softc(dev);
139 node = ofw_bus_get_node(device_get_parent(dev));
140 OF_getprop(node, "min-clock-frequency", &sc->minfreq, sizeof(sc->minfreq));
141 OF_getprop(node, "max-clock-frequency", &sc->maxfreq, sizeof(sc->maxfreq));
142 OF_getprop(node, "rounded-clock-frequency", &sc->curfreq, sizeof(sc->curfreq));
143 sc->minfreq /= 1000000;
144 sc->maxfreq /= 1000000;
145 sc->curfreq /= 1000000;
147 cpufreq_register(dev);
152 pmufreq_settings(device_t dev, struct cf_setting *sets, int *count)
154 struct pmufreq_softc *sc;
156 sc = device_get_softc(dev);
157 if (sets == NULL || count == NULL)
162 /* Return a list of valid settings for this driver. */
163 memset(sets, CPUFREQ_VAL_UNKNOWN, sizeof(*sets) * 2);
165 sets[0].freq = sc->maxfreq; sets[0].dev = dev;
166 sets[1].freq = sc->minfreq; sets[1].dev = dev;
167 /* Set high latency for CPU frequency changes, it's a tedious process. */
168 sets[0].lat = INT_MAX;
169 sets[1].lat = INT_MAX;
176 pmufreq_set(device_t dev, const struct cf_setting *set)
178 struct pmufreq_softc *sc;
179 int error, speed_sel;
184 sc = device_get_softc(dev);
186 if (set->freq == sc->maxfreq)
191 error = pmu_set_speed(speed_sel);
193 sc->curfreq = set->freq;
199 pmufreq_get(device_t dev, struct cf_setting *set)
201 struct pmufreq_softc *sc;
205 sc = device_get_softc(dev);
207 set->freq = sc->curfreq;
214 pmufreq_type(device_t dev, int *type)
220 *type = CPUFREQ_TYPE_ABSOLUTE;