9d6cd3d858
This commit adds drivers for Alpine Cache Coherency Unit and North Bridge Service whose task is to configure the system fabric and enable cache coherency. Obtained from: Semihalf Submitted by: Michal Stanek <mst@semihalf.com> Sponsored by: Annapurna Labs Reviewed by: wma Differential Revision: https://reviews.freebsd.org/D7565
130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
/*-
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* Copyright (c) 2015,2016 Annapurna Labs Ltd. and affiliates
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* All rights reserved.
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*
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* Developed by Semihalf.
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, 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/bus.h>
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#include <sys/conf.h>
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#include <sys/rman.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/resource.h>
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#include <sys/systm.h>
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#include <machine/bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#define AL_NB_ACF_MISC_OFFSET 0xD0
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#define AL_NB_ACF_MISC_READ_BYPASS (1 << 30)
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static struct resource_spec nb_service_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE },
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{ -1, 0 }
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};
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struct nb_service_softc {
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struct resource *res;
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};
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static int nb_service_probe(device_t dev);
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static int nb_service_attach(device_t dev);
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static int nb_service_detach(device_t dev);
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static device_method_t nb_service_methods[] = {
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DEVMETHOD(device_probe, nb_service_probe),
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DEVMETHOD(device_attach, nb_service_attach),
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DEVMETHOD(device_detach, nb_service_detach),
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{ 0, 0 }
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};
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static driver_t nb_service_driver = {
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"nb_service",
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nb_service_methods,
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sizeof(struct nb_service_softc)
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};
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static devclass_t nb_service_devclass;
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EARLY_DRIVER_MODULE(nb_service, simplebus, nb_service_driver,
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nb_service_devclass, 0, 0, BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
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EARLY_DRIVER_MODULE(nb_service, ofwbus, nb_service_driver,
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nb_service_devclass, 0, 0, BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
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static int
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nb_service_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-nb-service"))
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return (ENXIO);
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device_set_desc(dev, "Alpine North Bridge Service");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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nb_service_attach(device_t dev)
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{
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struct nb_service_softc *sc;
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uint32_t val;
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int err;
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sc = device_get_softc(dev);
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err = bus_alloc_resources(dev, nb_service_spec, &sc->res);
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if (err != 0) {
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device_printf(dev, "could not allocate resources\n");
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return (err);
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}
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/* Do not allow reads to bypass writes to different addresses */
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val = bus_read_4(sc->res, AL_NB_ACF_MISC_OFFSET);
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val &= ~AL_NB_ACF_MISC_READ_BYPASS;
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bus_write_4(sc->res, AL_NB_ACF_MISC_OFFSET, val);
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return (0);
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}
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static int
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nb_service_detach(device_t dev)
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{
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struct nb_service_softc *sc;
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sc = device_get_softc(dev);
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bus_release_resources(dev, nb_service_spec, &sc->res);
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return (0);
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}
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