519b64e27f
This reverts commit aa37baf3d7.
The reverted commit was motivated by a problem observed on stable/12,
but it turns out that a better solution was committed in r348309 but not
MFCed. So, revert this change since it is unnecessary and not really
correct: it assumes that the order in which module metadata records is
defined determines their order in the output linker set. While this
seems to hold in my testing, it is not guaranteed.
Reported by: cem
Discussed with: imp
MFC after: 3 days
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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