1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright 2002 by Peter Grehan. All rights reserved. 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 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 /* 33 * PSIM 'iobus' local bus. Should be set up in the device tree like: 34 * 35 * /iobus@0x80000000/name psim-iobus 36 * 37 * Code borrowed from various nexus.c and uninorth.c :-) 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/malloc.h> 44 #include <sys/module.h> 45 #include <sys/bus.h> 46 #include <machine/bus.h> 47 #include <sys/rman.h> 48 49 #include <dev/ofw/ofw_bus.h> 50 #include <dev/ofw/openfirm.h> 51 52 #include <machine/vmparam.h> 53 #include <vm/vm.h> 54 #include <vm/pmap.h> 55 56 #include <machine/resource.h> 57 58 #include <powerpc/psim/iobusvar.h> 59 60 struct iobus_softc { 61 phandle_t sc_node; 62 vm_offset_t sc_addr; 63 vm_offset_t sc_size; 64 struct rman sc_mem_rman; 65 }; 66 67 static MALLOC_DEFINE(M_IOBUS, "iobus", "iobus device information"); 68 69 static int iobus_probe(device_t); 70 static int iobus_attach(device_t); 71 static int iobus_print_child(device_t dev, device_t child); 72 static void iobus_probe_nomatch(device_t, device_t); 73 static int iobus_read_ivar(device_t, device_t, int, uintptr_t *); 74 static int iobus_write_ivar(device_t, device_t, int, uintptr_t); 75 static struct resource *iobus_alloc_resource(device_t, device_t, int, int *, 76 rman_res_t, rman_res_t, rman_res_t, 77 u_int); 78 static int iobus_activate_resource(device_t, device_t, int, int, 79 struct resource *); 80 static int iobus_deactivate_resource(device_t, device_t, int, int, 81 struct resource *); 82 static int iobus_release_resource(device_t, device_t, int, int, 83 struct resource *); 84 85 /* 86 * Bus interface definition 87 */ 88 static device_method_t iobus_methods[] = { 89 /* Device interface */ 90 DEVMETHOD(device_probe, iobus_probe), 91 DEVMETHOD(device_attach, iobus_attach), 92 DEVMETHOD(device_detach, bus_generic_detach), 93 DEVMETHOD(device_shutdown, bus_generic_shutdown), 94 DEVMETHOD(device_suspend, bus_generic_suspend), 95 DEVMETHOD(device_resume, bus_generic_resume), 96 97 /* Bus interface */ 98 DEVMETHOD(bus_print_child, iobus_print_child), 99 DEVMETHOD(bus_probe_nomatch, iobus_probe_nomatch), 100 DEVMETHOD(bus_read_ivar, iobus_read_ivar), 101 DEVMETHOD(bus_write_ivar, iobus_write_ivar), 102 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 103 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 104 105 DEVMETHOD(bus_alloc_resource, iobus_alloc_resource), 106 DEVMETHOD(bus_release_resource, iobus_release_resource), 107 DEVMETHOD(bus_activate_resource, iobus_activate_resource), 108 DEVMETHOD(bus_deactivate_resource, iobus_deactivate_resource), 109 { 0, 0 } 110 }; 111 112 static driver_t iobus_driver = { 113 "iobus", 114 iobus_methods, 115 sizeof(struct iobus_softc) 116 }; 117 118 DRIVER_MODULE(iobus, ofwbus, iobus_driver, 0, 0); 119 120 static int 121 iobus_probe(device_t dev) 122 { 123 const char *type = ofw_bus_get_name(dev); 124 125 if (strcmp(type, "psim-iobus") != 0) 126 return (ENXIO); 127 128 device_set_desc(dev, "PSIM local bus"); 129 return (0); 130 } 131 132 /* 133 * Add interrupt/addr range to the dev's resource list if present 134 */ 135 static void 136 iobus_add_intr(phandle_t devnode, struct iobus_devinfo *dinfo) 137 { 138 u_int intr = -1; 139 140 if (OF_getprop(devnode, "interrupt", &intr, sizeof(intr)) != -1) { 141 resource_list_add(&dinfo->id_resources, 142 SYS_RES_IRQ, 0, intr, intr, 1); 143 } 144 dinfo->id_interrupt = intr; 145 } 146 147 static void 148 iobus_add_reg(phandle_t devnode, struct iobus_devinfo *dinfo, 149 vm_offset_t iobus_off) 150 { 151 u_int size; 152 int i; 153 154 size = OF_getprop(devnode, "reg", dinfo->id_reg,sizeof(dinfo->id_reg)); 155 156 if (size != -1) { 157 dinfo->id_nregs = size / (sizeof(dinfo->id_reg[0])); 158 159 for (i = 0; i < dinfo->id_nregs; i+= 3) { 160 /* 161 * Scale the absolute addresses back to iobus 162 * relative offsets. This is to better simulate 163 * macio 164 */ 165 dinfo->id_reg[i+1] -= iobus_off; 166 167 resource_list_add(&dinfo->id_resources, 168 SYS_RES_MEMORY, 0, 169 dinfo->id_reg[i+1], 170 dinfo->id_reg[i+1] + 171 dinfo->id_reg[i+2], 172 dinfo->id_reg[i+2]); 173 } 174 } 175 } 176 177 static int 178 iobus_attach(device_t dev) 179 { 180 struct iobus_softc *sc; 181 struct iobus_devinfo *dinfo; 182 phandle_t root; 183 phandle_t child; 184 device_t cdev; 185 char *name; 186 u_int reg[2]; 187 int size; 188 189 sc = device_get_softc(dev); 190 sc->sc_node = ofw_bus_get_node(dev); 191 192 /* 193 * Find the base addr/size of the iobus, and initialize the 194 * resource manager 195 */ 196 size = OF_getprop(sc->sc_node, "reg", reg, sizeof(reg)); 197 if (size == sizeof(reg)) { 198 sc->sc_addr = reg[0]; 199 sc->sc_size = reg[1]; 200 } else { 201 return (ENXIO); 202 } 203 204 sc->sc_mem_rman.rm_type = RMAN_ARRAY; 205 sc->sc_mem_rman.rm_descr = "IOBus Device Memory"; 206 if (rman_init(&sc->sc_mem_rman) != 0) { 207 device_printf(dev, 208 "failed to init mem range resources\n"); 209 return (ENXIO); 210 } 211 rman_manage_region(&sc->sc_mem_rman, 0, sc->sc_size); 212 213 /* 214 * Iterate through the sub-devices 215 */ 216 root = sc->sc_node; 217 218 for (child = OF_child(root); child != 0; child = OF_peer(child)) { 219 OF_getprop_alloc(child, "name", (void **)&name); 220 221 cdev = device_add_child(dev, NULL, -1); 222 if (cdev != NULL) { 223 dinfo = malloc(sizeof(*dinfo), M_IOBUS, M_WAITOK); 224 memset(dinfo, 0, sizeof(*dinfo)); 225 resource_list_init(&dinfo->id_resources); 226 dinfo->id_node = child; 227 dinfo->id_name = name; 228 iobus_add_intr(child, dinfo); 229 iobus_add_reg(child, dinfo, sc->sc_addr); 230 device_set_ivars(cdev, dinfo); 231 } else { 232 OF_prop_free(name); 233 } 234 } 235 236 return (bus_generic_attach(dev)); 237 } 238 239 static int 240 iobus_print_child(device_t dev, device_t child) 241 { 242 struct iobus_devinfo *dinfo; 243 struct resource_list *rl; 244 int retval = 0; 245 246 dinfo = device_get_ivars(child); 247 rl = &dinfo->id_resources; 248 249 retval += bus_print_child_header(dev, child); 250 251 retval += printf(" offset 0x%x", dinfo->id_reg[1]); 252 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%jd"); 253 254 retval += bus_print_child_footer(dev, child); 255 256 return (retval); 257 } 258 259 static void 260 iobus_probe_nomatch(device_t dev, device_t child) 261 { 262 } 263 264 static int 265 iobus_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 266 { 267 struct iobus_devinfo *dinfo; 268 269 if ((dinfo = device_get_ivars(child)) == NULL) 270 return (ENOENT); 271 272 switch (which) { 273 case IOBUS_IVAR_NODE: 274 *result = dinfo->id_node; 275 break; 276 case IOBUS_IVAR_NAME: 277 *result = (uintptr_t)dinfo->id_name; 278 break; 279 case IOBUS_IVAR_NREGS: 280 *result = dinfo->id_nregs; 281 break; 282 case IOBUS_IVAR_REGS: 283 *result = (uintptr_t)dinfo->id_reg; 284 break; 285 default: 286 return (ENOENT); 287 } 288 289 return (0); 290 } 291 292 static int 293 iobus_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 294 { 295 return (EINVAL); 296 } 297 298 static struct resource * 299 iobus_alloc_resource(device_t bus, device_t child, int type, int *rid, 300 rman_res_t start, rman_res_t end, rman_res_t count, 301 u_int flags) 302 { 303 struct iobus_softc *sc; 304 int needactivate; 305 struct resource *rv; 306 struct rman *rm; 307 308 sc = device_get_softc(bus); 309 310 needactivate = flags & RF_ACTIVE; 311 flags &= ~RF_ACTIVE; 312 313 switch (type) { 314 case SYS_RES_MEMORY: 315 case SYS_RES_IOPORT: 316 rm = &sc->sc_mem_rman; 317 break; 318 case SYS_RES_IRQ: 319 return (bus_alloc_resource(bus, type, rid, start, end, count, 320 flags)); 321 default: 322 device_printf(bus, "unknown resource request from %s\n", 323 device_get_nameunit(child)); 324 return (NULL); 325 } 326 327 rv = rman_reserve_resource(rm, start, end, count, flags, child); 328 if (rv == NULL) { 329 device_printf(bus, "failed to reserve resource for %s\n", 330 device_get_nameunit(child)); 331 return (NULL); 332 } 333 334 rman_set_rid(rv, *rid); 335 336 if (needactivate) { 337 if (bus_activate_resource(child, type, *rid, rv) != 0) { 338 device_printf(bus, 339 "failed to activate resource for %s\n", 340 device_get_nameunit(child)); 341 rman_release_resource(rv); 342 return (NULL); 343 } 344 } 345 346 return (rv); 347 } 348 349 static int 350 iobus_release_resource(device_t bus, device_t child, int type, int rid, 351 struct resource *res) 352 { 353 if (rman_get_flags(res) & RF_ACTIVE) { 354 int error = bus_deactivate_resource(child, type, rid, res); 355 if (error) 356 return error; 357 } 358 359 return (rman_release_resource(res)); 360 } 361 362 static int 363 iobus_activate_resource(device_t bus, device_t child, int type, int rid, 364 struct resource *res) 365 { 366 struct iobus_softc *sc; 367 void *p; 368 369 sc = device_get_softc(bus); 370 371 if (type == SYS_RES_IRQ) 372 return (bus_activate_resource(bus, type, rid, res)); 373 374 if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) { 375 p = pmap_mapdev((vm_paddr_t)rman_get_start(res) + sc->sc_addr, 376 (vm_size_t)rman_get_size(res)); 377 if (p == NULL) 378 return (ENOMEM); 379 rman_set_virtual(res, p); 380 rman_set_bustag(res, &bs_le_tag); 381 rman_set_bushandle(res, (u_long)p); 382 } 383 384 return (rman_activate_resource(res)); 385 } 386 387 static int 388 iobus_deactivate_resource(device_t bus, device_t child, int type, int rid, 389 struct resource *res) 390 { 391 /* 392 * If this is a memory resource, unmap it. 393 */ 394 if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) { 395 u_int32_t psize; 396 397 psize = rman_get_size(res); 398 pmap_unmapdev((vm_offset_t)rman_get_virtual(res), psize); 399 } 400 401 return (rman_deactivate_resource(res)); 402 } 403