ofwbus.c revision 99652
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 99652 2002-07-09 11:13:33Z benno $ 56 */ 57 58#include <sys/param.h> 59#include <sys/systm.h> 60#include <sys/bus.h> 61#include <sys/cons.h> 62#include <sys/kernel.h> 63#include <sys/malloc.h> 64 65#include <dev/ofw/openfirm.h> 66 67#include <machine/bus.h> 68#include <machine/frame.h> 69#include <machine/intr_machdep.h> 70#include <machine/nexusvar.h> 71#include <machine/resource.h> 72 73#include <sys/rman.h> 74 75#include "pic_if.h" 76 77/* 78 * The nexus (which is a pseudo-bus actually) iterates over the nodes that 79 * exist in OpenFirmware and adds them as devices to this bus so that drivers 80 * can be attached to them. 81 * 82 * Maybe this code should get into dev/ofw to some extent, as some of it should 83 * work for all OpenFirmware based machines... 84 */ 85 86static MALLOC_DEFINE(M_NEXUS, "nexus", "nexus device information"); 87 88struct nexus_devinfo { 89 phandle_t ndi_node; 90 /* Some common properties. */ 91 char *ndi_name; 92 char *ndi_device_type; 93 char *ndi_compatible; 94}; 95 96struct nexus_softc { 97 device_t sc_pic; 98}; 99 100/* 101 * Device interface 102 */ 103static int nexus_probe(device_t); 104static void nexus_probe_nomatch(device_t, device_t); 105 106/* 107 * Bus interface 108 */ 109static int nexus_read_ivar(device_t, device_t, int, uintptr_t *); 110static int nexus_write_ivar(device_t, device_t, int, uintptr_t); 111static int nexus_setup_intr(device_t, device_t, struct resource *, int, 112 driver_intr_t *, void *, void **); 113static int nexus_teardown_intr(device_t, device_t, struct resource *, 114 void *); 115static struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 116 u_long, u_long, u_long, u_int); 117static int nexus_activate_resource(device_t, device_t, int, int, 118 struct resource *); 119static int nexus_deactivate_resource(device_t, device_t, int, int, 120 struct resource *); 121static int nexus_release_resource(device_t, device_t, int, int, 122 struct resource *); 123 124/* 125 * Local routines 126 */ 127static device_t create_device_from_node(device_t, phandle_t); 128 129static device_method_t nexus_methods[] = { 130 /* Device interface */ 131 DEVMETHOD(device_probe, nexus_probe), 132 DEVMETHOD(device_attach, bus_generic_attach), 133 DEVMETHOD(device_detach, bus_generic_detach), 134 DEVMETHOD(device_shutdown, bus_generic_shutdown), 135 DEVMETHOD(device_suspend, bus_generic_suspend), 136 DEVMETHOD(device_resume, bus_generic_resume), 137 138 /* Bus interface. Resource management is business of the children... */ 139 DEVMETHOD(bus_print_child, bus_generic_print_child), 140 DEVMETHOD(bus_probe_nomatch, nexus_probe_nomatch), 141 DEVMETHOD(bus_read_ivar, nexus_read_ivar), 142 DEVMETHOD(bus_write_ivar, nexus_write_ivar), 143 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 144 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 145 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 146 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 147 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 148 DEVMETHOD(bus_release_resource, nexus_release_resource), 149 150 { 0, 0 } 151}; 152 153static driver_t nexus_driver = { 154 "nexus", 155 nexus_methods, 156 sizeof(struct nexus_softc), 157}; 158 159static devclass_t nexus_devclass; 160 161DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 162 163static int 164nexus_probe(device_t dev) 165{ 166 phandle_t root; 167 phandle_t pic, cpus, child, new_node, temp_node; 168 struct nexus_softc *sc; 169 170 if ((root = OF_peer(0)) == -1) 171 panic("nexus_probe: OF_peer failed."); 172 173 sc = device_get_softc(dev); 174 175 if ((cpus = OF_finddevice("/cpus")) != -1) { 176 for (child = OF_child(cpus); child; child = OF_peer(child)) 177 (void)create_device_from_node(dev, child); 178 } 179 180 if ((child = OF_finddevice("/chosen")) == -1) 181 printf("nexus_probe: can't find /chosen"); 182 183 if (OF_getprop(child, "interrupt-controller", &pic, 4) != 4) 184 printf("nexus_probe: can't get interrupt-controller"); 185 186 sc->sc_pic = create_device_from_node(dev, pic); 187 188 if (sc->sc_pic == NULL) 189 printf("nexus_probe: failed to create PIC device"); 190 191 child = root; 192 while (child != 0) { 193 if (child != pic) 194 (void)create_device_from_node(dev, child); 195 196 if (child == cpus) 197 new_node = 0; 198 else 199 new_node = OF_child(child); 200 if (new_node == -1) 201 panic("nexus_probe: OF_child returned -1"); 202 if (new_node == 0) 203 new_node = OF_peer(child); 204 if (new_node == 0) { 205 temp_node = child; 206 while (new_node == 0) { 207 temp_node = OF_parent(temp_node); 208 if (temp_node == 0) 209 break; 210 new_node = OF_peer(temp_node); 211 } 212 } 213 child = new_node; 214 } 215 device_set_desc(dev, "OpenFirmware Nexus device"); 216 217 { 218 u_int *foo = 0xf8000020; 219 pmap_kenter(0xf8000000, 0xf8000000); 220 printf(">>> uni_n_clock_ctl = %08x\n", *foo); 221 pmap_kremove(0xf8000000); 222 } 223 return (0); 224} 225 226static void 227nexus_probe_nomatch(device_t dev, device_t child) 228{ 229 char *name, *type; 230 231 if (BUS_READ_IVAR(dev, child, NEXUS_IVAR_NAME, 232 (uintptr_t *)&name) != 0 || 233 BUS_READ_IVAR(dev, child, NEXUS_IVAR_DEVICE_TYPE, 234 (uintptr_t *)&type) != 0) 235 return; 236 237 if (type == NULL) 238 type = "(unknown)"; 239#if 0 240 device_printf(dev, "<%s>, type %s (no driver attached)\n", 241 name, type); 242#endif 243} 244 245static int 246nexus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 247{ 248 struct nexus_devinfo *dinfo; 249 250 if ((dinfo = device_get_ivars(child)) == 0) 251 return (ENOENT); 252 switch (which) { 253 case NEXUS_IVAR_NODE: 254 *result = dinfo->ndi_node; 255 break; 256 case NEXUS_IVAR_NAME: 257 *result = (uintptr_t)dinfo->ndi_name; 258 break; 259 case NEXUS_IVAR_DEVICE_TYPE: 260 *result = (uintptr_t)dinfo->ndi_device_type; 261 break; 262 case NEXUS_IVAR_COMPATIBLE: 263 *result = (uintptr_t)dinfo->ndi_compatible; 264 break; 265 default: 266 return (ENOENT); 267 } 268 return 0; 269} 270 271static int 272nexus_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 273{ 274 struct nexus_devinfo *dinfo; 275 276 if ((dinfo = device_get_ivars(child)) == 0) 277 return (ENOENT); 278 279 switch (which) { 280 case NEXUS_IVAR_NODE: 281 case NEXUS_IVAR_NAME: 282 case NEXUS_IVAR_DEVICE_TYPE: 283 return (EINVAL); 284 default: 285 return (ENOENT); 286 } 287 return 0; 288} 289 290static int 291nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags, 292 driver_intr_t *intr, void *arg, void **cookiep) 293{ 294 struct nexus_softc *sc; 295 296 sc = device_get_softc(dev); 297 298 if (device_get_state(sc->sc_pic) != DS_ATTACHED) 299 panic("nexus_setup_intr: no pic attached\n"); 300 301 return (PIC_SETUP_INTR(sc->sc_pic, child, res, flags, intr, arg, 302 cookiep)); 303} 304 305static int 306nexus_teardown_intr(device_t dev, device_t child, struct resource *res, 307 void *ih) 308{ 309 struct nexus_softc *sc; 310 311 sc = device_get_softc(dev); 312 313 if (device_get_state(sc->sc_pic) != DS_ATTACHED) 314 panic("nexus_teardown_intr: no pic attached\n"); 315 316 return (PIC_TEARDOWN_INTR(sc->sc_pic, child, res, ih)); 317} 318 319/* 320 * Allocate resources at the behest of a child. This only handles interrupts, 321 * since I/O resources are handled by child busses. 322 */ 323static struct resource * 324nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 325 u_long start, u_long end, u_long count, u_int flags) 326{ 327 struct nexus_softc *sc; 328 struct resource *rv; 329 330 sc = device_get_softc(bus); 331 332 if (type != SYS_RES_IRQ) { 333 device_printf(bus, "unknown resource request from %s\n", 334 device_get_nameunit(child)); 335 return (NULL); 336 } 337 338 if (device_get_state(sc->sc_pic) != DS_ATTACHED) 339 panic("nexus_alloc_resource: no pic attached\n"); 340 341 rv = PIC_ALLOCATE_INTR(sc->sc_pic, child, rid, start, flags); 342 343 return (rv); 344} 345 346static int 347nexus_activate_resource(device_t bus, device_t child, int type, int rid, 348 struct resource *res) 349{ 350 351 /* Not much to be done yet... */ 352 return (rman_activate_resource(res)); 353} 354 355static int 356nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 357 struct resource *res) 358{ 359 360 /* Not much to be done yet... */ 361 return (rman_deactivate_resource(res)); 362} 363 364static int 365nexus_release_resource(device_t bus, device_t child, int type, int rid, 366 struct resource *res) 367{ 368 struct nexus_softc *sc; 369 370 sc = device_get_softc(bus); 371 372 if (type != SYS_RES_IRQ) { 373 device_printf(bus, "unknown resource request from %s\n", 374 device_get_nameunit(child)); 375 return (NULL); 376 } 377 378 if (device_get_state(sc->sc_pic) != DS_ATTACHED) 379 panic("nexus_release_resource: no pic attached\n"); 380 381 return (PIC_RELEASE_INTR(sc->sc_pic, child, rid, res)); 382} 383 384static device_t 385create_device_from_node(device_t parent, phandle_t node) 386{ 387 device_t cdev; 388 struct nexus_devinfo *dinfo; 389 char *name, *type, *compatible; 390 391 OF_getprop_alloc(node, "name", 1, (void **)&name); 392 OF_getprop_alloc(node, "device_type", 1, (void **)&type); 393 OF_getprop_alloc(node, "compatible", 1, (void **)&compatible); 394 cdev = device_add_child(parent, NULL, -1); 395 if (cdev != NULL) { 396 dinfo = malloc(sizeof(*dinfo), M_NEXUS, M_WAITOK); 397 dinfo->ndi_node = node; 398 dinfo->ndi_name = name; 399 dinfo->ndi_device_type = type; 400 dinfo->ndi_compatible = compatible; 401 device_set_ivars(cdev, dinfo); 402 } else 403 free(name, M_OFWPROP); 404 405 return (cdev); 406} 407