26eb077d03
switching capabilities of the MPC7447A and MPC7448.
231 lines
5.3 KiB
C
231 lines
5.3 KiB
C
/*-
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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/module.h>
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#include "cpufreq_if.h"
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struct dfs_softc {
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device_t dev;
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int dfs4;
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};
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static void dfs_identify(driver_t *driver, device_t parent);
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static int dfs_probe(device_t dev);
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static int dfs_attach(device_t dev);
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static int dfs_settings(device_t dev, struct cf_setting *sets, int *count);
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static int dfs_set(device_t dev, const struct cf_setting *set);
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static int dfs_get(device_t dev, struct cf_setting *set);
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static int dfs_type(device_t dev, int *type);
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static device_method_t dfs_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, dfs_identify),
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DEVMETHOD(device_probe, dfs_probe),
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DEVMETHOD(device_attach, dfs_attach),
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/* cpufreq interface */
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DEVMETHOD(cpufreq_drv_set, dfs_set),
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DEVMETHOD(cpufreq_drv_get, dfs_get),
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DEVMETHOD(cpufreq_drv_type, dfs_type),
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DEVMETHOD(cpufreq_drv_settings, dfs_settings),
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{0, 0}
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};
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static driver_t dfs_driver = {
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"dfs",
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dfs_methods,
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sizeof(struct dfs_softc)
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};
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static devclass_t dfs_devclass;
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DRIVER_MODULE(dfs, cpu, dfs_driver, dfs_devclass, 0, 0);
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/*
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* Bits of the HID1 register to enable DFS. See page 2-24 of "MPC7450
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* RISC Microprocessor Family Reference Manual", rev. 5.
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*/
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#define HID1_DFS2 (1UL << 22)
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#define HID1_DFS4 (1UL << 23)
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static void
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dfs_identify(driver_t *driver, device_t parent)
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{
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uint16_t vers;
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vers = mfpvr() >> 16;
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/* Check for an MPC 7447A or 7448 CPU */
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switch (vers) {
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case MPC7447A:
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case MPC7448:
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break;
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default:
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return;
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}
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/* Make sure we're not being doubly invoked. */
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if (device_find_child(parent, "dfs", -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, "dfs", -1) == NULL)
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device_printf(parent, "add dfs child failed\n");
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}
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static int
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dfs_probe(device_t dev)
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{
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if (resource_disabled("dfs", 0))
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return (ENXIO);
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device_set_desc(dev, "Dynamic Frequency Switching");
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return (0);
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}
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static int
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dfs_attach(device_t dev)
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{
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struct dfs_softc *sc;
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uint16_t vers;
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sc = device_get_softc(dev);
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sc->dev = dev;
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sc->dfs4 = 0;
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vers = mfpvr() >> 16;
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/* The 7448 supports divide-by-four as well */
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if (vers == MPC7448)
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sc->dfs4 = 1;
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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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dfs_settings(device_t dev, struct cf_setting *sets, int *count)
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{
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struct dfs_softc *sc;
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int states;
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sc = device_get_softc(dev);
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states = sc->dfs4 ? 3 : 2;
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if (sets == NULL || count == NULL)
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return (EINVAL);
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if (*count < states)
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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) * states);
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sets[0].freq = 10000; sets[0].dev = dev;
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sets[1].freq = 5000; sets[1].dev = dev;
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if (sc->dfs4)
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sets[2].freq = 2500; sets[2].dev = dev;
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*count = states;
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return (0);
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}
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static int
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dfs_set(device_t dev, const struct cf_setting *set)
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{
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struct dfs_softc *sc;
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register_t hid1;
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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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hid1 = mfspr(SPR_HID1);
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hid1 &= ~(HID1_DFS2 | HID1_DFS4);
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if (set->freq == 5000)
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hid1 |= HID1_DFS2;
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else if (set->freq == 2500)
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hid1 |= HID1_DFS4;
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/*
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* Now set the HID1 register with new values. Calling sequence
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* taken from page 2-26 of the MPC7450 family CPU manual.
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*/
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powerpc_sync();
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mtspr(SPR_HID1, hid1);
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powerpc_sync(); isync();
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return (0);
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}
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static int
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dfs_get(device_t dev, struct cf_setting *set)
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{
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struct dfs_softc *sc;
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register_t hid1;
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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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memset(set, CPUFREQ_VAL_UNKNOWN, sizeof(*set));
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hid1 = mfspr(SPR_HID1);
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set->freq = 10000;
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if (hid1 & HID1_DFS2)
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set->freq = 5000;
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else if (sc->dfs4 && (hid1 & HID1_DFS4))
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set->freq = 2500;
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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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dfs_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_RELATIVE;
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return (0);
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}
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