freebsd-dev/sys/dev/pwm/ofw_pwmbus.c
2019-06-17 03:32:05 +00:00

224 lines
6.2 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2019 Ian Lepore <ian@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/libkern.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/openfirm.h>
#include <dev/pwm/pwmbus.h>
#include "pwmbus_if.h"
struct ofw_pwmbus_ivars {
struct pwmbus_ivars base;
struct ofw_bus_devinfo devinfo;
};
struct ofw_pwmbus_softc {
struct pwmbus_softc base;
};
/*
* bus_if methods...
*/
static device_t
ofw_pwmbus_add_child(device_t dev, u_int order, const char *name, int unit)
{
device_t child;
struct ofw_pwmbus_ivars *ivars;
if ((ivars = malloc(sizeof(struct ofw_pwmbus_ivars), M_DEVBUF,
M_NOWAIT | M_ZERO)) == NULL) {
return (NULL);
}
if ((child = device_add_child_ordered(dev, order, name, unit)) == NULL) {
free(ivars, M_DEVBUF);
return (NULL);
}
ivars->devinfo.obd_node = -1;
device_set_ivars(child, ivars);
return (child);
}
static void
ofw_pwmbus_child_deleted(device_t dev, device_t child)
{
struct ofw_pwmbus_ivars *ivars;
ivars = device_get_ivars(child);
if (ivars != NULL) {
ofw_bus_gen_destroy_devinfo(&ivars->devinfo);
free(ivars, M_DEVBUF);
}
}
static const struct ofw_bus_devinfo *
ofw_pwmbus_get_devinfo(device_t bus, device_t dev)
{
struct ofw_pwmbus_ivars *ivars;
ivars = device_get_ivars(dev);
return (&ivars->devinfo);
}
/*
* device_if methods...
*/
static int
ofw_pwmbus_probe(device_t dev)
{
if (ofw_bus_get_node(dev) == -1) {
return (ENXIO);
}
device_set_desc(dev, "OFW PWM bus");
return (BUS_PROBE_DEFAULT);
}
static int
ofw_pwmbus_attach(device_t dev)
{
struct ofw_pwmbus_softc *sc;
struct ofw_pwmbus_ivars *ivars;
phandle_t node;
device_t child, parent;
pcell_t chan;
bool any_children;
sc = device_get_softc(dev);
sc->base.dev = dev;
parent = device_get_parent(dev);
if (PWMBUS_CHANNEL_COUNT(parent, &sc->base.nchannels) != 0 ||
sc->base.nchannels == 0) {
device_printf(dev, "No channels on parent %s\n",
device_get_nameunit(parent));
return (ENXIO);
}
/*
* Attach the children found in the fdt node of the hardware controller.
* Hardware controllers must implement the ofw_bus_get_node method so
* that our call to ofw_bus_get_node() gets back the controller's node.
*/
any_children = false;
node = ofw_bus_get_node(dev);
for (node = OF_child(node); node != 0; node = OF_peer(node)) {
/*
* The child has to have a reg property; its value is the
* channel number so range-check it.
*/
if (OF_getencprop(node, "reg", &chan, sizeof(chan)) == -1)
continue;
if (chan >= sc->base.nchannels)
continue;
if ((child = ofw_pwmbus_add_child(dev, 0, NULL, -1)) == NULL)
continue;
ivars = device_get_ivars(child);
ivars->base.pi_channel = chan;
/* Set up the standard ofw devinfo. */
if (ofw_bus_gen_setup_devinfo(&ivars->devinfo, node) != 0) {
device_delete_child(dev, child);
continue;
}
any_children = true;
}
/*
* If we didn't find any children in the fdt data, add a pwmc(4) child
* for each channel, like the base pwmbus does. The idea is that if
* there is any fdt data, then we do exactly what it says and nothing
* more, otherwise we just provide generic userland access to all the
* pwm channels that exist like the base pwmbus's attach code does.
*/
if (!any_children) {
for (chan = 0; chan < sc->base.nchannels; ++chan) {
child = ofw_pwmbus_add_child(dev, 0, "pwmc", -1);
if (child == NULL) {
device_printf(dev, "failed to add pwmc child "
" device for channel %u\n", chan);
continue;
}
ivars = device_get_ivars(child);
ivars->base.pi_channel = chan;
}
}
bus_enumerate_hinted_children(dev);
bus_generic_probe(dev);
return (bus_generic_attach(dev));
}
static device_method_t ofw_pwmbus_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ofw_pwmbus_probe),
DEVMETHOD(device_attach, ofw_pwmbus_attach),
/* Bus interface */
DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
DEVMETHOD(bus_add_child, ofw_pwmbus_add_child),
DEVMETHOD(bus_child_deleted, ofw_pwmbus_child_deleted),
/* ofw_bus interface */
DEVMETHOD(ofw_bus_get_devinfo, ofw_pwmbus_get_devinfo),
DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
DEVMETHOD_END
};
devclass_t ofw_pwmbus_devclass;
DEFINE_CLASS_1(pwmbus, ofw_pwmbus_driver, ofw_pwmbus_methods,
sizeof(struct pwmbus_softc), pwmbus_driver);
EARLY_DRIVER_MODULE(ofw_pwmbus, pwm, ofw_pwmbus_driver, ofw_pwmbus_devclass,
0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
MODULE_VERSION(ofw_pwmbus, 1);
MODULE_DEPEND(ofw_pwmbus, pwmbus, 1, 1, 1);