2013-12-13 02:37:35 +00:00
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/*-
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2017-11-27 15:09:59 +00:00
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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2013-12-13 02:37:35 +00:00
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* Copyright (c) 2011 Justin Hibbits
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* Copyright (c) 2009 Nathan Whitehorn
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/cpu.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/module.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/openfirm.h>
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#include "cpufreq_if.h"
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#include "powerpc/powermac/pmuvar.h"
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struct pmufreq_softc {
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device_t dev;
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uint32_t minfreq;
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uint32_t maxfreq;
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uint32_t curfreq;
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};
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static void pmufreq_identify(driver_t *driver, device_t parent);
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static int pmufreq_probe(device_t dev);
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static int pmufreq_attach(device_t dev);
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static int pmufreq_settings(device_t dev, struct cf_setting *sets, int *count);
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static int pmufreq_set(device_t dev, const struct cf_setting *set);
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static int pmufreq_get(device_t dev, struct cf_setting *set);
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static int pmufreq_type(device_t dev, int *type);
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static device_method_t pmufreq_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, pmufreq_identify),
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DEVMETHOD(device_probe, pmufreq_probe),
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DEVMETHOD(device_attach, pmufreq_attach),
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/* cpufreq interface */
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DEVMETHOD(cpufreq_drv_set, pmufreq_set),
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DEVMETHOD(cpufreq_drv_get, pmufreq_get),
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DEVMETHOD(cpufreq_drv_type, pmufreq_type),
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DEVMETHOD(cpufreq_drv_settings, pmufreq_settings),
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{0, 0}
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};
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static driver_t pmufreq_driver = {
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"pmufreq",
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pmufreq_methods,
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sizeof(struct pmufreq_softc)
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};
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2022-04-19 21:08:04 +00:00
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DRIVER_MODULE(pmufreq, cpu, pmufreq_driver, 0, 0);
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2013-12-13 02:37:35 +00:00
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static void
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pmufreq_identify(driver_t *driver, device_t parent)
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{
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phandle_t node;
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uint32_t min_freq;
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node = ofw_bus_get_node(parent);
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if (OF_getprop(node, "min-clock-frequency", &min_freq, sizeof(min_freq)) == -1)
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return;
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/* Make sure we're not being doubly invoked. */
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if (device_find_child(parent, "pmufreq", -1) != NULL)
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return;
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/*
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* We attach a child for every CPU since settings need to
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* be performed on every CPU in the SMP case.
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*/
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if (BUS_ADD_CHILD(parent, 10, "pmufreq", -1) == NULL)
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device_printf(parent, "add pmufreq child failed\n");
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}
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static int
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pmufreq_probe(device_t dev)
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{
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phandle_t node;
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2013-12-13 05:54:25 +00:00
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uint32_t min_freq;
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2013-12-13 02:37:35 +00:00
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if (resource_disabled("pmufreq", 0))
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return (ENXIO);
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node = ofw_bus_get_node(device_get_parent(dev));
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/*
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* A scalable MPC7455 has min-clock-frequency/max-clock-frequency as OFW
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* properties of the 'cpu' node.
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*/
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if (OF_getprop(node, "min-clock-frequency", &min_freq, sizeof(min_freq)) == -1)
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return (ENXIO);
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device_set_desc(dev, "PMU-based frequency scaling");
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return (0);
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}
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static int
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pmufreq_attach(device_t dev)
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{
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struct pmufreq_softc *sc;
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phandle_t node;
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sc = device_get_softc(dev);
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sc->dev = dev;
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node = ofw_bus_get_node(device_get_parent(dev));
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OF_getprop(node, "min-clock-frequency", &sc->minfreq, sizeof(sc->minfreq));
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OF_getprop(node, "max-clock-frequency", &sc->maxfreq, sizeof(sc->maxfreq));
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OF_getprop(node, "rounded-clock-frequency", &sc->curfreq, sizeof(sc->curfreq));
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sc->minfreq /= 1000000;
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sc->maxfreq /= 1000000;
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sc->curfreq /= 1000000;
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cpufreq_register(dev);
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return (0);
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}
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static int
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pmufreq_settings(device_t dev, struct cf_setting *sets, int *count)
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{
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struct pmufreq_softc *sc;
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sc = device_get_softc(dev);
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if (sets == NULL || count == NULL)
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return (EINVAL);
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if (*count < 2)
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return (E2BIG);
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/* Return a list of valid settings for this driver. */
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memset(sets, CPUFREQ_VAL_UNKNOWN, sizeof(*sets) * 2);
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sets[0].freq = sc->maxfreq; sets[0].dev = dev;
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sets[1].freq = sc->minfreq; sets[1].dev = dev;
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/* Set high latency for CPU frequency changes, it's a tedious process. */
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sets[0].lat = INT_MAX;
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sets[1].lat = INT_MAX;
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*count = 2;
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return (0);
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}
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static int
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pmufreq_set(device_t dev, const struct cf_setting *set)
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{
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struct pmufreq_softc *sc;
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2013-12-13 05:54:25 +00:00
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int error, speed_sel;
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2013-12-13 02:37:35 +00:00
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if (set == NULL)
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return (EINVAL);
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sc = device_get_softc(dev);
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if (set->freq == sc->maxfreq)
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speed_sel = 0;
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else
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speed_sel = 1;
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error = pmu_set_speed(speed_sel);
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if (error == 0)
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sc->curfreq = set->freq;
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2013-12-13 05:54:25 +00:00
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return (error);
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2013-12-13 02:37:35 +00:00
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}
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static int
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pmufreq_get(device_t dev, struct cf_setting *set)
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{
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struct pmufreq_softc *sc;
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if (set == NULL)
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return (EINVAL);
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sc = device_get_softc(dev);
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set->freq = sc->curfreq;
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set->dev = dev;
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return (0);
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}
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static int
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pmufreq_type(device_t dev, int *type)
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{
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if (type == NULL)
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return (EINVAL);
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*type = CPUFREQ_TYPE_ABSOLUTE;
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return (0);
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}
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