/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2019 Ian Lepore * * 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 #include #include #include #include #include #include #include #include #include #include #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_identify_children(dev); bus_attach_children(dev); return (0); } 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, ofw_bus_gen_child_pnpinfo), 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 }; 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, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); MODULE_VERSION(ofw_pwmbus, 1); MODULE_DEPEND(ofw_pwmbus, pwmbus, 1, 1, 1);