1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011 Justin Hibbits
5 * Copyright (c) 2009 Nathan Whitehorn
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/bus.h>
36 #include <sys/cpu.h>
37 #include <sys/kernel.h>
38 #include <sys/limits.h>
39 #include <sys/module.h>
40
41 #include <dev/ofw/ofw_bus.h>
42 #include <dev/ofw/openfirm.h>
43
44 #include "cpufreq_if.h"
45 #include "powerpc/powermac/pmuvar.h"
46
47 struct pmufreq_softc {
48 device_t dev;
49 uint32_t minfreq;
50 uint32_t maxfreq;
51 uint32_t curfreq;
52 };
53
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);
61
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),
67
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),
73
74 {0, 0}
75 };
76
77 static driver_t pmufreq_driver = {
78 "pmufreq",
79 pmufreq_methods,
80 sizeof(struct pmufreq_softc)
81 };
82
83 static devclass_t pmufreq_devclass;
84 DRIVER_MODULE(pmufreq, cpu, pmufreq_driver, pmufreq_devclass, 0, 0);
85
86 static void
87 pmufreq_identify(driver_t *driver, device_t parent)
88 {
89 phandle_t node;
90 uint32_t min_freq;
91
92 node = ofw_bus_get_node(parent);
93 if (OF_getprop(node, "min-clock-frequency", &min_freq, sizeof(min_freq)) == -1)
94 return;
95
96 /* Make sure we're not being doubly invoked. */
97 if (device_find_child(parent, "pmufreq", -1) != NULL)
98 return;
99
100 /*
101 * We attach a child for every CPU since settings need to
102 * be performed on every CPU in the SMP case.
103 */
104 if (BUS_ADD_CHILD(parent, 10, "pmufreq", -1) == NULL)
105 device_printf(parent, "add pmufreq child failed\n");
106 }
107
108 static int
109 pmufreq_probe(device_t dev)
110 {
111 struct pmufreq_softc *sc;
112 phandle_t node;
113 uint32_t min_freq;
114
115 if (resource_disabled("pmufreq", 0))
116 return (ENXIO);
117
118 sc = device_get_softc(dev);
119 node = ofw_bus_get_node(device_get_parent(dev));
120 /*
121 * A scalable MPC7455 has min-clock-frequency/max-clock-frequency as OFW
122 * properties of the 'cpu' node.
123 */
124 if (OF_getprop(node, "min-clock-frequency", &min_freq, sizeof(min_freq)) == -1)
125 return (ENXIO);
126 device_set_desc(dev, "PMU-based frequency scaling");
127 return (0);
128 }
129
130 static int
131 pmufreq_attach(device_t dev)
132 {
133 struct pmufreq_softc *sc;
134 phandle_t node;
135
136 sc = device_get_softc(dev);
137 sc->dev = dev;
138
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;
146
147 cpufreq_register(dev);
148 return (0);
149 }
150
151 static int
152 pmufreq_settings(device_t dev, struct cf_setting *sets, int *count)
153 {
154 struct pmufreq_softc *sc;
155
156 sc = device_get_softc(dev);
157 if (sets == NULL || count == NULL)
158 return (EINVAL);
159 if (*count < 2)
160 return (E2BIG);
161
162 /* Return a list of valid settings for this driver. */
163 memset(sets, CPUFREQ_VAL_UNKNOWN, sizeof(*sets) * 2);
164
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;
170 *count = 2;
171
172 return (0);
173 }
174
175 static int
176 pmufreq_set(device_t dev, const struct cf_setting *set)
177 {
178 struct pmufreq_softc *sc;
179 int error, speed_sel;
180
181 if (set == NULL)
182 return (EINVAL);
183
184 sc = device_get_softc(dev);
185
186 if (set->freq == sc->maxfreq)
187 speed_sel = 0;
188 else
189 speed_sel = 1;
190
191 error = pmu_set_speed(speed_sel);
192 if (error == 0)
193 sc->curfreq = set->freq;
194
195 return (error);
196 }
197
198 static int
199 pmufreq_get(device_t dev, struct cf_setting *set)
200 {
201 struct pmufreq_softc *sc;
202
203 if (set == NULL)
204 return (EINVAL);
205 sc = device_get_softc(dev);
206
207 set->freq = sc->curfreq;
208 set->dev = dev;
209
210 return (0);
211 }
212
213 static int
214 pmufreq_type(device_t dev, int *type)
215 {
216
217 if (type == NULL)
218 return (EINVAL);
219
220 *type = CPUFREQ_TYPE_ABSOLUTE;
221 return (0);
222 }
223
Cache object: 8fdd03c79a12f05e43ef31962a66bbd0
|