224 lines
6.2 KiB
C
224 lines
6.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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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 <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/libkern.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <dev/fdt/fdt_common.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 <dev/pwm/pwmbus.h>
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#include "pwmbus_if.h"
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struct ofw_pwmbus_ivars {
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struct pwmbus_ivars base;
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struct ofw_bus_devinfo devinfo;
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};
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struct ofw_pwmbus_softc {
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struct pwmbus_softc base;
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};
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/*
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* bus_if methods...
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*/
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static device_t
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ofw_pwmbus_add_child(device_t dev, u_int order, const char *name, int unit)
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{
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device_t child;
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struct ofw_pwmbus_ivars *ivars;
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if ((ivars = malloc(sizeof(struct ofw_pwmbus_ivars), M_DEVBUF,
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M_NOWAIT | M_ZERO)) == NULL) {
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return (NULL);
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}
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if ((child = device_add_child_ordered(dev, order, name, unit)) == NULL) {
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free(ivars, M_DEVBUF);
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return (NULL);
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}
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ivars->devinfo.obd_node = -1;
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device_set_ivars(child, ivars);
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return (child);
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}
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static void
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ofw_pwmbus_child_deleted(device_t dev, device_t child)
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{
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struct ofw_pwmbus_ivars *ivars;
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ivars = device_get_ivars(child);
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if (ivars != NULL) {
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ofw_bus_gen_destroy_devinfo(&ivars->devinfo);
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free(ivars, M_DEVBUF);
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}
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}
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static const struct ofw_bus_devinfo *
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ofw_pwmbus_get_devinfo(device_t bus, device_t dev)
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{
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struct ofw_pwmbus_ivars *ivars;
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ivars = device_get_ivars(dev);
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return (&ivars->devinfo);
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}
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/*
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* device_if methods...
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*/
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static int
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ofw_pwmbus_probe(device_t dev)
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{
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if (ofw_bus_get_node(dev) == -1) {
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return (ENXIO);
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}
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device_set_desc(dev, "OFW PWM bus");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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ofw_pwmbus_attach(device_t dev)
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{
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struct ofw_pwmbus_softc *sc;
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struct ofw_pwmbus_ivars *ivars;
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phandle_t node;
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device_t child, parent;
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pcell_t chan;
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bool any_children;
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sc = device_get_softc(dev);
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sc->base.dev = dev;
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parent = device_get_parent(dev);
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if (PWMBUS_CHANNEL_COUNT(parent, &sc->base.nchannels) != 0 ||
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sc->base.nchannels == 0) {
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device_printf(dev, "No channels on parent %s\n",
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device_get_nameunit(parent));
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return (ENXIO);
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}
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/*
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* Attach the children found in the fdt node of the hardware controller.
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* Hardware controllers must implement the ofw_bus_get_node method so
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* that our call to ofw_bus_get_node() gets back the controller's node.
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*/
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any_children = false;
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node = ofw_bus_get_node(dev);
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for (node = OF_child(node); node != 0; node = OF_peer(node)) {
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/*
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* The child has to have a reg property; its value is the
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* channel number so range-check it.
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*/
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if (OF_getencprop(node, "reg", &chan, sizeof(chan)) == -1)
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continue;
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if (chan >= sc->base.nchannels)
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continue;
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if ((child = ofw_pwmbus_add_child(dev, 0, NULL, -1)) == NULL)
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continue;
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ivars = device_get_ivars(child);
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ivars->base.pi_channel = chan;
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/* Set up the standard ofw devinfo. */
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if (ofw_bus_gen_setup_devinfo(&ivars->devinfo, node) != 0) {
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device_delete_child(dev, child);
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continue;
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}
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any_children = true;
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}
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/*
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* If we didn't find any children in the fdt data, add a pwmc(4) child
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* for each channel, like the base pwmbus does. The idea is that if
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* there is any fdt data, then we do exactly what it says and nothing
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* more, otherwise we just provide generic userland access to all the
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* pwm channels that exist like the base pwmbus's attach code does.
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*/
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if (!any_children) {
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for (chan = 0; chan < sc->base.nchannels; ++chan) {
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child = ofw_pwmbus_add_child(dev, 0, "pwmc", -1);
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if (child == NULL) {
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device_printf(dev, "failed to add pwmc child "
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" device for channel %u\n", chan);
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continue;
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}
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ivars = device_get_ivars(child);
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ivars->base.pi_channel = chan;
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}
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}
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bus_enumerate_hinted_children(dev);
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bus_generic_probe(dev);
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return (bus_generic_attach(dev));
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}
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static device_method_t ofw_pwmbus_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, ofw_pwmbus_probe),
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DEVMETHOD(device_attach, ofw_pwmbus_attach),
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/* Bus interface */
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DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
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DEVMETHOD(bus_add_child, ofw_pwmbus_add_child),
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DEVMETHOD(bus_child_deleted, ofw_pwmbus_child_deleted),
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/* ofw_bus interface */
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DEVMETHOD(ofw_bus_get_devinfo, ofw_pwmbus_get_devinfo),
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DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
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DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
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DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
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DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
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DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
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DEVMETHOD_END
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};
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devclass_t ofw_pwmbus_devclass;
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DEFINE_CLASS_1(pwmbus, ofw_pwmbus_driver, ofw_pwmbus_methods,
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sizeof(struct pwmbus_softc), pwmbus_driver);
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EARLY_DRIVER_MODULE(ofw_pwmbus, pwm, ofw_pwmbus_driver, ofw_pwmbus_devclass,
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0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
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MODULE_VERSION(ofw_pwmbus, 1);
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MODULE_DEPEND(ofw_pwmbus, pwmbus, 1, 1, 1);
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