145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
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/*
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* Copyright (c) 2017 Oleksandr Tymoshenko <gonzo@freebsd.org>
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Ben Gray.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BEN GRAY ``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 BEN GRAY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* SCM - System Control Module
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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/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include "versatile_scm.h"
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struct versatile_scm_softc {
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device_t sc_dev;
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struct resource * sc_mem_res;
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};
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static struct versatile_scm_softc *versatile_scm_sc;
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#define versatile_scm_read_4(sc, reg) \
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bus_read_4((sc)->sc_mem_res, (reg))
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#define versatile_scm_write_4(sc, reg, val) \
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bus_write_4((sc)->sc_mem_res, (reg), (val))
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static int
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versatile_scm_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, "syscon"))
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return (ENXIO);
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if (versatile_scm_sc) {
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return (EEXIST);
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}
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device_set_desc(dev, "Versatile Control Module");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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versatile_scm_attach(device_t dev)
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{
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struct versatile_scm_softc *sc;
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int rid;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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rid = 0;
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sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
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if (sc->sc_mem_res == NULL) {
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device_printf(dev, "could not allocate memory resources\n");
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return (ENXIO);
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}
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versatile_scm_sc = sc;
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return (0);
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}
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int
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versatile_scm_reg_read_4(uint32_t reg, uint32_t *val)
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{
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if (!versatile_scm_sc)
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return (ENXIO);
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*val = versatile_scm_read_4(versatile_scm_sc, reg);
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return (0);
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}
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int
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versatile_scm_reg_write_4(uint32_t reg, uint32_t val)
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{
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if (!versatile_scm_sc)
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return (ENXIO);
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versatile_scm_write_4(versatile_scm_sc, reg, val);
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return (0);
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}
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static device_method_t versatile_scm_methods[] = {
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DEVMETHOD(device_probe, versatile_scm_probe),
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DEVMETHOD(device_attach, versatile_scm_attach),
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DEVMETHOD_END
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};
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static driver_t versatile_scm_driver = {
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"scm",
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versatile_scm_methods,
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sizeof(struct versatile_scm_softc),
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};
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static devclass_t versatile_scm_devclass;
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EARLY_DRIVER_MODULE(versatile_scm, simplebus, versatile_scm_driver, versatile_scm_devclass, 0, 0,
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BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
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