1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2019 Ian Lepore <ian@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/bus.h> 33 #include <sys/kernel.h> 34 #include <sys/libkern.h> 35 #include <sys/lock.h> 36 #include <sys/module.h> 37 38 #include <dev/fdt/fdt_common.h> 39 #include <dev/ofw/ofw_bus.h> 40 #include <dev/ofw/ofw_bus_subr.h> 41 #include <dev/ofw/openfirm.h> 42 #include <dev/pwm/pwmbus.h> 43 44 #include "pwmbus_if.h" 45 46 struct ofw_pwmbus_ivars { 47 struct pwmbus_ivars base; 48 struct ofw_bus_devinfo devinfo; 49 }; 50 51 struct ofw_pwmbus_softc { 52 struct pwmbus_softc base; 53 }; 54 55 /* 56 * bus_if methods... 57 */ 58 59 static device_t 60 ofw_pwmbus_add_child(device_t dev, u_int order, const char *name, int unit) 61 { 62 device_t child; 63 struct ofw_pwmbus_ivars *ivars; 64 65 if ((ivars = malloc(sizeof(struct ofw_pwmbus_ivars), M_DEVBUF, 66 M_NOWAIT | M_ZERO)) == NULL) { 67 return (NULL); 68 } 69 70 if ((child = device_add_child_ordered(dev, order, name, unit)) == NULL) { 71 free(ivars, M_DEVBUF); 72 return (NULL); 73 } 74 75 ivars->devinfo.obd_node = -1; 76 device_set_ivars(child, ivars); 77 78 return (child); 79 } 80 81 static void 82 ofw_pwmbus_child_deleted(device_t dev, device_t child) 83 { 84 struct ofw_pwmbus_ivars *ivars; 85 86 ivars = device_get_ivars(child); 87 if (ivars != NULL) { 88 ofw_bus_gen_destroy_devinfo(&ivars->devinfo); 89 free(ivars, M_DEVBUF); 90 } 91 } 92 93 static const struct ofw_bus_devinfo * 94 ofw_pwmbus_get_devinfo(device_t bus, device_t dev) 95 { 96 struct ofw_pwmbus_ivars *ivars; 97 98 ivars = device_get_ivars(dev); 99 return (&ivars->devinfo); 100 } 101 102 /* 103 * device_if methods... 104 */ 105 106 static int 107 ofw_pwmbus_probe(device_t dev) 108 { 109 110 if (ofw_bus_get_node(dev) == -1) { 111 return (ENXIO); 112 } 113 device_set_desc(dev, "OFW PWM bus"); 114 115 return (BUS_PROBE_DEFAULT); 116 } 117 118 static int 119 ofw_pwmbus_attach(device_t dev) 120 { 121 struct ofw_pwmbus_softc *sc; 122 struct ofw_pwmbus_ivars *ivars; 123 phandle_t node; 124 device_t child, parent; 125 pcell_t chan; 126 bool any_children; 127 128 sc = device_get_softc(dev); 129 sc->base.dev = dev; 130 parent = device_get_parent(dev); 131 132 if (PWMBUS_CHANNEL_COUNT(parent, &sc->base.nchannels) != 0 || 133 sc->base.nchannels == 0) { 134 device_printf(dev, "No channels on parent %s\n", 135 device_get_nameunit(parent)); 136 return (ENXIO); 137 } 138 139 /* 140 * Attach the children found in the fdt node of the hardware controller. 141 * Hardware controllers must implement the ofw_bus_get_node method so 142 * that our call to ofw_bus_get_node() gets back the controller's node. 143 */ 144 any_children = false; 145 node = ofw_bus_get_node(dev); 146 for (node = OF_child(node); node != 0; node = OF_peer(node)) { 147 /* 148 * The child has to have a reg property; its value is the 149 * channel number so range-check it. 150 */ 151 if (OF_getencprop(node, "reg", &chan, sizeof(chan)) == -1) 152 continue; 153 if (chan >= sc->base.nchannels) 154 continue; 155 156 if ((child = ofw_pwmbus_add_child(dev, 0, NULL, -1)) == NULL) 157 continue; 158 159 ivars = device_get_ivars(child); 160 ivars->base.pi_channel = chan; 161 162 /* Set up the standard ofw devinfo. */ 163 if (ofw_bus_gen_setup_devinfo(&ivars->devinfo, node) != 0) { 164 device_delete_child(dev, child); 165 continue; 166 } 167 any_children = true; 168 } 169 170 /* 171 * If we didn't find any children in the fdt data, add a pwmc(4) child 172 * for each channel, like the base pwmbus does. The idea is that if 173 * there is any fdt data, then we do exactly what it says and nothing 174 * more, otherwise we just provide generic userland access to all the 175 * pwm channels that exist like the base pwmbus's attach code does. 176 */ 177 if (!any_children) { 178 for (chan = 0; chan < sc->base.nchannels; ++chan) { 179 child = ofw_pwmbus_add_child(dev, 0, "pwmc", -1); 180 if (child == NULL) { 181 device_printf(dev, "failed to add pwmc child " 182 " device for channel %u\n", chan); 183 continue; 184 } 185 ivars = device_get_ivars(child); 186 ivars->base.pi_channel = chan; 187 } 188 } 189 bus_enumerate_hinted_children(dev); 190 bus_generic_probe(dev); 191 192 return (bus_generic_attach(dev)); 193 } 194 195 static device_method_t ofw_pwmbus_methods[] = { 196 /* Device interface */ 197 DEVMETHOD(device_probe, ofw_pwmbus_probe), 198 DEVMETHOD(device_attach, ofw_pwmbus_attach), 199 200 /* Bus interface */ 201 DEVMETHOD(bus_child_pnpinfo, ofw_bus_gen_child_pnpinfo), 202 DEVMETHOD(bus_add_child, ofw_pwmbus_add_child), 203 DEVMETHOD(bus_child_deleted, ofw_pwmbus_child_deleted), 204 205 /* ofw_bus interface */ 206 DEVMETHOD(ofw_bus_get_devinfo, ofw_pwmbus_get_devinfo), 207 DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat), 208 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model), 209 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name), 210 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node), 211 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type), 212 213 DEVMETHOD_END 214 }; 215 216 devclass_t ofw_pwmbus_devclass; 217 218 DEFINE_CLASS_1(pwmbus, ofw_pwmbus_driver, ofw_pwmbus_methods, 219 sizeof(struct pwmbus_softc), pwmbus_driver); 220 EARLY_DRIVER_MODULE(ofw_pwmbus, pwm, ofw_pwmbus_driver, ofw_pwmbus_devclass, 221 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 222 MODULE_VERSION(ofw_pwmbus, 1); 223 MODULE_DEPEND(ofw_pwmbus, pwmbus, 1, 1, 1); 224