ofwbus.c revision 133862
1/* 2 * Copyright 1998 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29/*- 30 * Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>. All rights reserved. 31 * 32 * Redistribution and use in source and binary forms, with or without 33 * modification, are permitted provided that the following conditions 34 * are met: 35 * 1. Redistributions of source code must retain the above copyright 36 * notice, this list of conditions and the following disclaimer. 37 * 2. Redistributions in binary form must reproduce the above copyright 38 * notice, this list of conditions and the following disclaimer in the 39 * documentation and/or other materials provided with the distribution. 40 * 41 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * from: FreeBSD: src/sys/i386/i386/nexus.c,v 1.43 2001/02/09 54 * 55 * $FreeBSD: head/sys/powerpc/aim/nexus.c 133862 2004-08-16 15:45:27Z marius $ 56 */ 57#include "opt_psim.h" 58 59#include <sys/param.h> 60#include <sys/systm.h> 61#include <sys/module.h> 62#include <sys/bus.h> 63#include <sys/cons.h> 64#include <sys/kernel.h> 65#include <sys/malloc.h> 66 67#include <dev/ofw/openfirm.h> 68 69#include <machine/bus.h> 70#include <machine/frame.h> 71#include <machine/intr_machdep.h> 72#include <machine/nexusvar.h> 73#include <machine/resource.h> 74 75#include <sys/rman.h> 76 77#include "pic_if.h" 78 79/* 80 * The nexus (which is a pseudo-bus actually) iterates over the nodes that 81 * exist in Open Firmware and adds them as devices to this bus so that drivers 82 * can be attached to them. 83 * 84 * Maybe this code should get into dev/ofw to some extent, as some of it should 85 * work for all Open Firmware based machines... 86 */ 87 88static MALLOC_DEFINE(M_NEXUS, "nexus", "nexus device information"); 89 90struct nexus_devinfo { 91 phandle_t ndi_node; 92 /* Some common properties. */ 93 const char *ndi_name; 94 const char *ndi_device_type; 95 const char *ndi_compatible; 96}; 97 98struct nexus_softc { 99 device_t sc_pic; 100}; 101 102/* 103 * Device interface 104 */ 105static int nexus_probe(device_t); 106static void nexus_probe_nomatch(device_t, device_t); 107 108/* 109 * Bus interface 110 */ 111static device_t nexus_add_child(device_t, int, const char *, int); 112static int nexus_read_ivar(device_t, device_t, int, uintptr_t *); 113static int nexus_write_ivar(device_t, device_t, int, uintptr_t); 114static int nexus_setup_intr(device_t, device_t, struct resource *, int, 115 driver_intr_t *, void *, void **); 116static int nexus_teardown_intr(device_t, device_t, struct resource *, 117 void *); 118static struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 119 u_long, u_long, u_long, u_int); 120static int nexus_activate_resource(device_t, device_t, int, int, 121 struct resource *); 122static int nexus_deactivate_resource(device_t, device_t, int, int, 123 struct resource *); 124static int nexus_release_resource(device_t, device_t, int, int, 125 struct resource *); 126 127/* 128 * Local routines 129 */ 130static device_t nexus_device_from_node(device_t, phandle_t); 131 132static device_method_t nexus_methods[] = { 133 /* Device interface */ 134 DEVMETHOD(device_probe, nexus_probe), 135 DEVMETHOD(device_attach, bus_generic_attach), 136 DEVMETHOD(device_detach, bus_generic_detach), 137 DEVMETHOD(device_shutdown, bus_generic_shutdown), 138 DEVMETHOD(device_suspend, bus_generic_suspend), 139 DEVMETHOD(device_resume, bus_generic_resume), 140 141 /* Bus interface. Resource management is business of the children... */ 142 DEVMETHOD(bus_add_child, nexus_add_child), 143 DEVMETHOD(bus_print_child, bus_generic_print_child), 144 DEVMETHOD(bus_probe_nomatch, nexus_probe_nomatch), 145 DEVMETHOD(bus_read_ivar, nexus_read_ivar), 146 DEVMETHOD(bus_write_ivar, nexus_write_ivar), 147 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 148 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 149 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 150 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 151 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 152 DEVMETHOD(bus_release_resource, nexus_release_resource), 153 154 { 0, 0 } 155}; 156 157static driver_t nexus_driver = { 158 "nexus", 159 nexus_methods, 160 sizeof(struct nexus_softc), 161}; 162 163static devclass_t nexus_devclass; 164 165DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 166 167static int 168nexus_probe(device_t dev) 169{ 170 phandle_t root; 171 phandle_t child; 172 struct nexus_softc *sc; 173 174 if ((root = OF_peer(0)) == -1) 175 panic("nexus_probe: OF_peer failed."); 176 177 sc = device_get_softc(dev); 178 179 /* 180 * Allow devices to identify 181 */ 182 bus_generic_probe(dev); 183 184 /* 185 * Now walk the OFW tree to locate top-level devices 186 */ 187 for (child = OF_child(root); child != 0; child = OF_peer(child)) { 188 if (child == -1) 189 panic("nexus_probe(): OF_child failed."); 190 (void)nexus_device_from_node(dev, child); 191 192 } 193 device_set_desc(dev, "Open Firmware Nexus device"); 194 return (0); 195} 196 197static void 198nexus_probe_nomatch(device_t dev, device_t child) 199{ 200 char *name, *type; 201 202 if (BUS_READ_IVAR(dev, child, NEXUS_IVAR_NAME, 203 (uintptr_t *)&name) != 0 || 204 BUS_READ_IVAR(dev, child, NEXUS_IVAR_DEVICE_TYPE, 205 (uintptr_t *)&type) != 0) 206 return; 207 208 if (type == NULL) 209 type = "(unknown)"; 210 211 if (bootverbose) 212 device_printf(dev, "<%s>, type %s (no driver attached)\n", 213 name, type); 214} 215 216static device_t 217nexus_add_child(device_t dev, int order, const char *name, int unit) 218{ 219 device_t child; 220 struct nexus_devinfo *dinfo; 221 222 child = device_add_child_ordered(dev, order, name, unit); 223 if (child == NULL) 224 return (NULL); 225 226 dinfo = malloc(sizeof(struct nexus_devinfo), M_NEXUS, M_NOWAIT|M_ZERO); 227 if (dinfo == NULL) 228 return (NULL); 229 230 dinfo->ndi_node = -1; 231 dinfo->ndi_name = name; 232 device_set_ivars(child, dinfo); 233 234 return (child); 235} 236 237 238static int 239nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 240{ 241 struct nexus_devinfo *dinfo; 242 243 if ((dinfo = device_get_ivars(child)) == 0) 244 return (ENOENT); 245 switch (which) { 246 case NEXUS_IVAR_NODE: 247 *result = dinfo->ndi_node; 248 break; 249 case NEXUS_IVAR_NAME: 250 *result = (uintptr_t)dinfo->ndi_name; 251 break; 252 case NEXUS_IVAR_DEVICE_TYPE: 253 *result = (uintptr_t)dinfo->ndi_device_type; 254 break; 255 case NEXUS_IVAR_COMPATIBLE: 256 *result = (uintptr_t)dinfo->ndi_compatible; 257 break; 258 default: 259 return (ENOENT); 260 } 261 return 0; 262} 263 264static int 265nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 266{ 267 struct nexus_devinfo *dinfo; 268 269 if ((dinfo = device_get_ivars(child)) == 0) 270 return (ENOENT); 271 272 switch (which) { 273 case NEXUS_IVAR_NAME: 274 return (EINVAL); 275 276 /* Identified devices may want to set these */ 277 case NEXUS_IVAR_NODE: 278 dinfo->ndi_node = (phandle_t)value; 279 break; 280 281 case NEXUS_IVAR_DEVICE_TYPE: 282 dinfo->ndi_device_type = (char *)value; 283 break; 284 285 default: 286 return (ENOENT); 287 } 288 return 0; 289} 290 291static int 292nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 293 driver_intr_t *intr, void *arg, void **cookiep) 294{ 295 struct nexus_softc *sc; 296 297 sc = device_get_softc(dev); 298 299 if (device_get_state(sc->sc_pic) != DS_ATTACHED) 300 panic("nexus_setup_intr: no pic attached\n"); 301 302 return (PIC_SETUP_INTR(sc->sc_pic, child, res, flags, intr, arg, 303 cookiep)); 304} 305 306static int 307nexus_teardown_intr(device_t dev, device_t child, struct resource *res, 308 void *ih) 309{ 310 struct nexus_softc *sc; 311 312 sc = device_get_softc(dev); 313 314 if (device_get_state(sc->sc_pic) != DS_ATTACHED) 315 panic("nexus_teardown_intr: no pic attached\n"); 316 317 return (PIC_TEARDOWN_INTR(sc->sc_pic, child, res, ih)); 318} 319 320/* 321 * Allocate resources at the behest of a child. This only handles interrupts, 322 * since I/O resources are handled by child busses. 323 */ 324static struct resource * 325nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 326 u_long start, u_long end, u_long count, u_int flags) 327{ 328 struct nexus_softc *sc; 329 struct resource *rv; 330 331 sc = device_get_softc(bus); 332 333 if (type != SYS_RES_IRQ) { 334 device_printf(bus, "unknown resource request from %s\n", 335 device_get_nameunit(child)); 336 return (NULL); 337 } 338 339 if (device_get_state(sc->sc_pic) != DS_ATTACHED) 340 panic("nexus_alloc_resource: no pic attached\n"); 341 342 rv = PIC_ALLOCATE_INTR(sc->sc_pic, child, rid, start, flags); 343 344 return (rv); 345} 346 347static int 348nexus_activate_resource(device_t bus, device_t child, int type, int rid, 349 struct resource *res) 350{ 351 352 /* Not much to be done yet... */ 353 return (rman_activate_resource(res)); 354} 355 356static int 357nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 358 struct resource *res) 359{ 360 361 /* Not much to be done yet... */ 362 return (rman_deactivate_resource(res)); 363} 364 365static int 366nexus_release_resource(device_t bus, device_t child, int type, int rid, 367 struct resource *res) 368{ 369 struct nexus_softc *sc; 370 371 sc = device_get_softc(bus); 372 373 if (type != SYS_RES_IRQ) { 374 device_printf(bus, "unknown resource request from %s\n", 375 device_get_nameunit(child)); 376 return (EINVAL); 377 } 378 379 if (device_get_state(sc->sc_pic) != DS_ATTACHED) 380 panic("nexus_release_resource: no pic attached\n"); 381 382 return (PIC_RELEASE_INTR(sc->sc_pic, child, rid, res)); 383} 384 385static device_t 386nexus_device_from_node(device_t parent, phandle_t node) 387{ 388 device_t cdev; 389 struct nexus_devinfo *dinfo; 390 char *name, *type, *compatible; 391 392 OF_getprop_alloc(node, "name", 1, (void **)&name); 393 OF_getprop_alloc(node, "device_type", 1, (void **)&type); 394 OF_getprop_alloc(node, "compatible", 1, (void **)&compatible); 395 cdev = device_add_child(parent, NULL, -1); 396 if (cdev != NULL) { 397 dinfo = malloc(sizeof(*dinfo), M_NEXUS, M_WAITOK); 398 dinfo->ndi_node = node; 399 dinfo->ndi_name = name; 400 dinfo->ndi_device_type = type; 401 dinfo->ndi_compatible = compatible; 402 device_set_ivars(cdev, dinfo); 403 } else 404 free(name, M_OFWPROP); 405 406 return (cdev); 407} 408 409int 410nexus_install_intcntlr(device_t dev) 411{ 412 struct nexus_softc *sc; 413 414 sc = device_get_softc(device_get_parent(dev)); 415 sc->sc_pic = dev; 416 417 return (0); 418} 419