1 /*- 2 * Copyright 1998 Massachusetts Institute of Technology 3 * Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>. 4 * Copyright 2006 by Marius Strobl <marius@FreeBSD.org>. 5 * All rights reserved. 6 * 7 * Permission to use, copy, modify, and distribute this software and 8 * its documentation for any purpose and without fee is hereby 9 * granted, provided that both the above copyright notice and this 10 * permission notice appear in all copies, that both the above 11 * copyright notice and this permission notice appear in all 12 * supporting documentation, and that the name of M.I.T. not be used 13 * in advertising or publicity pertaining to distribution of the 14 * software without specific, written prior permission. M.I.T. makes 15 * no representations about the suitability of this software for any 16 * purpose. It is provided "as is" without express or implied 17 * warranty. 18 * 19 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 20 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 21 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 23 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 26 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 27 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 29 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: FreeBSD: src/sys/i386/i386/nexus.c,v 1.43 2001/02/09 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/bus.h> 41 #include <sys/kernel.h> 42 #include <sys/malloc.h> 43 #include <sys/module.h> 44 #include <sys/pcpu.h> 45 #include <sys/rman.h> 46 #ifdef INTRNG 47 #include <sys/intr.h> 48 #endif 49 50 #include <vm/vm.h> 51 #include <vm/pmap.h> 52 53 #include <dev/ofw/ofw_bus.h> 54 #include <dev/ofw/ofw_bus_subr.h> 55 #include <dev/ofw/openfirm.h> 56 #include <dev/fdt/simplebus.h> 57 58 #include <machine/bus.h> 59 #include <machine/resource.h> 60 61 /* 62 * The ofwbus (which is a pseudo-bus actually) iterates over the nodes that 63 * hang from the Open Firmware root node and adds them as devices to this bus 64 * (except some special nodes which are excluded) so that drivers can be 65 * attached to them. 66 * 67 */ 68 69 struct ofwbus_softc { 70 struct simplebus_softc simplebus_sc; 71 struct rman sc_intr_rman; 72 struct rman sc_mem_rman; 73 }; 74 75 #ifndef __aarch64__ 76 static device_identify_t ofwbus_identify; 77 #endif 78 static device_probe_t ofwbus_probe; 79 static device_attach_t ofwbus_attach; 80 static bus_alloc_resource_t ofwbus_alloc_resource; 81 static bus_adjust_resource_t ofwbus_adjust_resource; 82 static bus_release_resource_t ofwbus_release_resource; 83 84 static device_method_t ofwbus_methods[] = { 85 /* Device interface */ 86 #ifndef __aarch64__ 87 DEVMETHOD(device_identify, ofwbus_identify), 88 #endif 89 DEVMETHOD(device_probe, ofwbus_probe), 90 DEVMETHOD(device_attach, ofwbus_attach), 91 92 /* Bus interface */ 93 DEVMETHOD(bus_alloc_resource, ofwbus_alloc_resource), 94 DEVMETHOD(bus_adjust_resource, ofwbus_adjust_resource), 95 DEVMETHOD(bus_release_resource, ofwbus_release_resource), 96 97 DEVMETHOD_END 98 }; 99 100 DEFINE_CLASS_1(ofwbus, ofwbus_driver, ofwbus_methods, 101 sizeof(struct ofwbus_softc), simplebus_driver); 102 EARLY_DRIVER_MODULE(ofwbus, nexus, ofwbus_driver, 0, 0, 103 BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 104 MODULE_VERSION(ofwbus, 1); 105 106 #ifndef __aarch64__ 107 static void 108 ofwbus_identify(driver_t *driver, device_t parent) 109 { 110 111 /* Check if Open Firmware has been instantiated */ 112 if (OF_peer(0) == 0) 113 return; 114 115 if (device_find_child(parent, "ofwbus", -1) == NULL) 116 BUS_ADD_CHILD(parent, 0, "ofwbus", -1); 117 } 118 #endif 119 120 static int 121 ofwbus_probe(device_t dev) 122 { 123 124 #ifdef __aarch64__ 125 if (OF_peer(0) == 0) 126 return (ENXIO); 127 #endif 128 129 device_set_desc(dev, "Open Firmware Device Tree"); 130 return (BUS_PROBE_NOWILDCARD); 131 } 132 133 static int 134 ofwbus_attach(device_t dev) 135 { 136 struct ofwbus_softc *sc; 137 phandle_t node; 138 struct ofw_bus_devinfo obd; 139 140 sc = device_get_softc(dev); 141 142 node = OF_peer(0); 143 144 /* 145 * If no Open Firmware, bail early 146 */ 147 if (node == -1) 148 return (ENXIO); 149 150 /* 151 * ofwbus bus starts on unamed node in FDT, so we cannot make 152 * ofw_bus_devinfo from it. Pass node to simplebus_init directly. 153 */ 154 simplebus_init(dev, node); 155 sc->sc_intr_rman.rm_type = RMAN_ARRAY; 156 sc->sc_intr_rman.rm_descr = "Interrupts"; 157 sc->sc_mem_rman.rm_type = RMAN_ARRAY; 158 sc->sc_mem_rman.rm_descr = "Device Memory"; 159 if (rman_init(&sc->sc_intr_rman) != 0 || 160 rman_init(&sc->sc_mem_rman) != 0 || 161 rman_manage_region(&sc->sc_intr_rman, 0, ~0) != 0 || 162 rman_manage_region(&sc->sc_mem_rman, 0, BUS_SPACE_MAXADDR) != 0) 163 panic("%s: failed to set up rmans.", __func__); 164 165 /* 166 * Allow devices to identify. 167 */ 168 bus_generic_probe(dev); 169 170 /* 171 * Now walk the OFW tree and attach top-level devices. 172 */ 173 for (node = OF_child(node); node > 0; node = OF_peer(node)) { 174 if (ofw_bus_gen_setup_devinfo(&obd, node) != 0) 175 continue; 176 simplebus_add_device(dev, node, 0, NULL, -1, NULL); 177 } 178 return (bus_generic_attach(dev)); 179 } 180 181 static struct resource * 182 ofwbus_alloc_resource(device_t bus, device_t child, int type, int *rid, 183 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 184 { 185 struct ofwbus_softc *sc; 186 struct rman *rm; 187 struct resource *rv; 188 struct resource_list_entry *rle; 189 int isdefault, passthrough; 190 191 isdefault = RMAN_IS_DEFAULT_RANGE(start, end); 192 passthrough = (device_get_parent(child) != bus); 193 sc = device_get_softc(bus); 194 rle = NULL; 195 if (!passthrough && isdefault) { 196 rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child), 197 type, *rid); 198 if (rle == NULL) { 199 if (bootverbose) 200 device_printf(bus, "no default resources for " 201 "rid = %d, type = %d\n", *rid, type); 202 return (NULL); 203 } 204 start = rle->start; 205 count = ummax(count, rle->count); 206 end = ummax(rle->end, start + count - 1); 207 } 208 209 switch (type) { 210 case SYS_RES_IRQ: 211 rm = &sc->sc_intr_rman; 212 break; 213 case SYS_RES_MEMORY: 214 rm = &sc->sc_mem_rman; 215 break; 216 default: 217 return (NULL); 218 } 219 220 rv = rman_reserve_resource(rm, start, end, count, flags & ~RF_ACTIVE, 221 child); 222 if (rv == NULL) 223 return (NULL); 224 rman_set_rid(rv, *rid); 225 226 if ((flags & RF_ACTIVE) != 0 && bus_activate_resource(child, type, 227 *rid, rv) != 0) { 228 rman_release_resource(rv); 229 return (NULL); 230 } 231 232 if (!passthrough && rle != NULL) { 233 rle->res = rv; 234 rle->start = rman_get_start(rv); 235 rle->end = rman_get_end(rv); 236 rle->count = rle->end - rle->start + 1; 237 } 238 239 return (rv); 240 } 241 242 static int 243 ofwbus_adjust_resource(device_t bus, device_t child __unused, int type, 244 struct resource *r, rman_res_t start, rman_res_t end) 245 { 246 struct ofwbus_softc *sc; 247 struct rman *rm; 248 device_t ofwbus; 249 250 ofwbus = bus; 251 while (strcmp(device_get_name(device_get_parent(ofwbus)), "root") != 0) 252 ofwbus = device_get_parent(ofwbus); 253 sc = device_get_softc(ofwbus); 254 switch (type) { 255 case SYS_RES_IRQ: 256 rm = &sc->sc_intr_rman; 257 break; 258 case SYS_RES_MEMORY: 259 rm = &sc->sc_mem_rman; 260 break; 261 default: 262 return (EINVAL); 263 } 264 if (rm == NULL) 265 return (ENXIO); 266 if (rman_is_region_manager(r, rm) == 0) 267 return (EINVAL); 268 return (rman_adjust_resource(r, start, end)); 269 } 270 271 static int 272 ofwbus_release_resource(device_t bus, device_t child, int type, 273 int rid, struct resource *r) 274 { 275 struct resource_list_entry *rle; 276 int passthrough; 277 int error; 278 279 passthrough = (device_get_parent(child) != bus); 280 if (!passthrough) { 281 /* Clean resource list entry */ 282 rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child), 283 type, rid); 284 if (rle != NULL) 285 rle->res = NULL; 286 } 287 288 if ((rman_get_flags(r) & RF_ACTIVE) != 0) { 289 error = bus_deactivate_resource(child, type, rid, r); 290 if (error) 291 return (error); 292 } 293 return (rman_release_resource(r)); 294 } 295