163 lines
4.5 KiB
C
163 lines
4.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Ian Lepore <ian@freebsd.org>
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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 "opt_platform.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/systm.h>
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#include <dev/iicbus/iicbus.h>
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#include <dev/iicbus/iiconf.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/ofw/openfirm.h>
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#include "iicbus_if.h"
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#include "iicmux_if.h"
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static struct ofw_compat_data compat_data[] = {
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{"nxp,pca9547", 1},
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{NULL, 0}
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};
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IICBUS_FDT_PNP_INFO(compat_data);
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#include <dev/iicbus/mux/iicmux.h>
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struct pca9547_softc {
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struct iicmux_softc mux;
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device_t dev;
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bool idle_disconnect;
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};
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static int
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pca9547_bus_select(device_t dev, int busidx, struct iic_reqbus_data *rd)
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{
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struct pca9547_softc *sc = device_get_softc(dev);
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uint8_t busbits;
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/*
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* The iicmux caller ensures busidx is between 0 and the number of buses
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* we passed to iicmux_init_softc(), no need for validation here. If
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* the fdt data has the idle_disconnect property we idle the bus by
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* selecting no downstream buses, otherwise we just leave the current
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* bus active. The upper bits of control register 3 activate the
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* downstream buses; bit 7 is the first bus, bit 6 the second, etc.
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*/
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if (busidx == IICMUX_SELECT_IDLE) {
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if (sc->idle_disconnect)
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busbits = 0;
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else
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return (0);
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} else {
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busbits = 0x8 | (busidx & 0x7);
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}
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/*
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* We have to add the IIC_RECURSIVE flag because the iicmux core has
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* already reserved the bus for us, and iicdev_writeto() is going to try
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* to reserve it again, which is allowed with the recursive flag.
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*/
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return (iicdev_writeto(dev, busbits, NULL, 0,
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rd->flags | IIC_RECURSIVE));
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}
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static int
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pca9547_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)
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return (ENXIO);
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device_set_desc(dev, "PCA9547 IIC bus multiplexor");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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pca9547_attach(device_t dev)
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{
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struct pca9547_softc *sc;
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phandle_t node;
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int rv;
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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(dev);
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sc->idle_disconnect = OF_hasprop(node, "i2c-mux-idle-disconnect");
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rv = iicmux_attach(sc->dev, device_get_parent(dev), 8);
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if (rv != 0)
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return (rv);
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rv = bus_generic_attach(dev);
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return (rv);
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}
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static int
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pca9547_detach(device_t dev)
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{
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int rv;
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rv = iicmux_detach(dev);
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if (rv != 0)
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return (rv);
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return (0);
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}
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static device_method_t pca9547_methods[] = {
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/* device methods */
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DEVMETHOD(device_probe, pca9547_probe),
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DEVMETHOD(device_attach, pca9547_attach),
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DEVMETHOD(device_detach, pca9547_detach),
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/* iicmux methods */
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DEVMETHOD(iicmux_bus_select, pca9547_bus_select),
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DEVMETHOD_END
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};
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static devclass_t pca9547_devclass;
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DEFINE_CLASS_1(iicmux, pca9547_driver, pca9547_methods,
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sizeof(struct pca9547_softc), iicmux_driver);
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DRIVER_MODULE(pca_iicmux, iicbus, pca9547_driver, pca9547_devclass, 0, 0);
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DRIVER_MODULE(iicbus, iicmux, iicbus_driver, iicbus_devclass, 0, 0);
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DRIVER_MODULE(ofw_iicbus, iicmux, ofw_iicbus_driver, ofw_iicbus_devclass,
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0, 0);
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MODULE_DEPEND(pca9547, iicmux, 1, 1, 1);
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MODULE_DEPEND(pca9547, iicbus, 1, 1, 1);
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