166 lines
4.2 KiB
C
166 lines
4.2 KiB
C
/*-
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* Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
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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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* $FreeBSD$
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*/
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/*
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* Allwinner module software reset registers
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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/rman.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <machine/bus.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 <dev/extres/hwreset/hwreset.h>
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#include "hwreset_if.h"
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#define RESET_OFFSET(index) ((index / 32) * 4)
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#define RESET_SHIFT(index) (index % 32)
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static struct ofw_compat_data compat_data[] = {
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{ "allwinner,sun6i-a31-ahb1-reset", 1 },
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{ "allwinner,sun6i-a31-clock-reset", 1 },
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{ NULL, 0 }
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};
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struct aw_reset_softc {
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struct resource *res;
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struct mtx mtx;
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};
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static struct resource_spec aw_reset_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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#define RESET_READ(sc, reg) bus_read_4((sc)->res, (reg))
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#define RESET_WRITE(sc, reg, val) bus_write_4((sc)->res, (reg), (val))
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static int
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aw_reset_assert(device_t dev, intptr_t id, bool reset)
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{
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struct aw_reset_softc *sc;
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uint32_t reg_value;
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sc = device_get_softc(dev);
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mtx_lock(&sc->mtx);
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reg_value = RESET_READ(sc, RESET_OFFSET(id));
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if (reset)
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reg_value &= ~(1 << RESET_SHIFT(id));
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else
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reg_value |= (1 << RESET_SHIFT(id));
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RESET_WRITE(sc, RESET_OFFSET(id), reg_value);
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mtx_unlock(&sc->mtx);
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return (0);
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}
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static int
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aw_reset_is_asserted(device_t dev, intptr_t id, bool *reset)
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{
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struct aw_reset_softc *sc;
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uint32_t reg_value;
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sc = device_get_softc(dev);
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mtx_lock(&sc->mtx);
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reg_value = RESET_READ(sc, RESET_OFFSET(id));
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mtx_unlock(&sc->mtx);
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*reset = (reg_value & (1 << RESET_SHIFT(id))) != 0 ? false : true;
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return (0);
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}
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static int
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aw_reset_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_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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device_set_desc(dev, "Allwinner Module Resets");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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aw_reset_attach(device_t dev)
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{
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struct aw_reset_softc *sc;
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sc = device_get_softc(dev);
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if (bus_alloc_resources(dev, aw_reset_spec, &sc->res) != 0) {
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device_printf(dev, "cannot allocate resources for device\n");
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return (ENXIO);
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}
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mtx_init(&sc->mtx, device_get_nameunit(dev), NULL, MTX_DEF);
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hwreset_register_ofw_provider(dev);
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return (0);
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}
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static device_method_t aw_reset_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, aw_reset_probe),
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DEVMETHOD(device_attach, aw_reset_attach),
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/* Reset interface */
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DEVMETHOD(hwreset_assert, aw_reset_assert),
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DEVMETHOD(hwreset_is_asserted, aw_reset_is_asserted),
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DEVMETHOD_END
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};
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static driver_t aw_reset_driver = {
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"aw_reset",
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aw_reset_methods,
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sizeof(struct aw_reset_softc),
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};
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static devclass_t aw_reset_devclass;
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EARLY_DRIVER_MODULE(aw_reset, simplebus, aw_reset_driver, aw_reset_devclass,
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0, 0, BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);
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MODULE_VERSION(aw_reset, 1);
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