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 47 #include <vm/vm.h> 48 #include <vm/pmap.h> 49 50 #include <dev/ofw/ofw_bus.h> 51 #include <dev/ofw/ofw_bus_subr.h> 52 #include <dev/ofw/openfirm.h> 53 #include <dev/fdt/simplebus.h> 54 55 #include <machine/bus.h> 56 #include <machine/resource.h> 57 58 /* 59 * The ofwbus (which is a pseudo-bus actually) iterates over the nodes that 60 * hang from the Open Firmware root node and adds them as devices to this bus 61 * (except some special nodes which are excluded) so that drivers can be 62 * attached to them. 63 * 64 */ 65 66 struct ofwbus_softc { 67 struct simplebus_softc simplebus_sc; 68 struct rman sc_intr_rman; 69 struct rman sc_mem_rman; 70 }; 71 72 #ifndef __aarch64__ 73 static device_identify_t ofwbus_identify; 74 #endif 75 static device_probe_t ofwbus_probe; 76 static device_attach_t ofwbus_attach; 77 static bus_alloc_resource_t ofwbus_alloc_resource; 78 static bus_adjust_resource_t ofwbus_adjust_resource; 79 static bus_release_resource_t ofwbus_release_resource; 80 81 static device_method_t ofwbus_methods[] = { 82 /* Device interface */ 83 #ifndef __aarch64__ 84 DEVMETHOD(device_identify, ofwbus_identify), 85 #endif 86 DEVMETHOD(device_probe, ofwbus_probe), 87 DEVMETHOD(device_attach, ofwbus_attach), 88 89 /* Bus interface */ 90 DEVMETHOD(bus_alloc_resource, ofwbus_alloc_resource), 91 DEVMETHOD(bus_adjust_resource, ofwbus_adjust_resource), 92 DEVMETHOD(bus_release_resource, ofwbus_release_resource), 93 94 DEVMETHOD_END 95 }; 96 97 DEFINE_CLASS_1(ofwbus, ofwbus_driver, ofwbus_methods, 98 sizeof(struct ofwbus_softc), simplebus_driver); 99 static devclass_t ofwbus_devclass; 100 EARLY_DRIVER_MODULE(ofwbus, nexus, ofwbus_driver, ofwbus_devclass, 0, 0, 101 BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 102 MODULE_VERSION(ofwbus, 1); 103 104 #ifndef __aarch64__ 105 static void 106 ofwbus_identify(driver_t *driver, device_t parent) 107 { 108 109 /* Check if Open Firmware has been instantiated */ 110 if (OF_peer(0) == 0) 111 return; 112 113 if (device_find_child(parent, "ofwbus", -1) == NULL) 114 BUS_ADD_CHILD(parent, 0, "ofwbus", -1); 115 } 116 #endif 117 118 static int 119 ofwbus_probe(device_t dev) 120 { 121 122 #ifdef __aarch64__ 123 if (OF_peer(0) == 0) 124 return (ENXIO); 125 #endif 126 127 device_set_desc(dev, "Open Firmware Device Tree"); 128 return (BUS_PROBE_NOWILDCARD); 129 } 130 131 static int 132 ofwbus_attach(device_t dev) 133 { 134 struct ofwbus_softc *sc; 135 phandle_t node; 136 struct ofw_bus_devinfo obd; 137 138 sc = device_get_softc(dev); 139 140 node = OF_peer(0); 141 142 /* 143 * If no Open Firmware, bail early 144 */ 145 if (node == -1) 146 return (ENXIO); 147 148 /* 149 * ofwbus bus starts on unamed node in FDT, so we cannot make 150 * ofw_bus_devinfo from it. Pass node to simplebus_init directly. 151 */ 152 simplebus_init(dev, node); 153 sc->sc_intr_rman.rm_type = RMAN_ARRAY; 154 sc->sc_intr_rman.rm_descr = "Interrupts"; 155 sc->sc_mem_rman.rm_type = RMAN_ARRAY; 156 sc->sc_mem_rman.rm_descr = "Device Memory"; 157 if (rman_init(&sc->sc_intr_rman) != 0 || 158 rman_init(&sc->sc_mem_rman) != 0 || 159 rman_manage_region(&sc->sc_intr_rman, 0, ~0) != 0 || 160 rman_manage_region(&sc->sc_mem_rman, 0, BUS_SPACE_MAXADDR) != 0) 161 panic("%s: failed to set up rmans.", __func__); 162 163 /* 164 * Allow devices to identify. 165 */ 166 bus_generic_probe(dev); 167 168 /* 169 * Now walk the OFW tree and attach top-level devices. 170 */ 171 for (node = OF_child(node); node > 0; node = OF_peer(node)) { 172 if (ofw_bus_gen_setup_devinfo(&obd, node) != 0) 173 continue; 174 simplebus_add_device(dev, node, 0, NULL, -1, NULL); 175 } 176 return (bus_generic_attach(dev)); 177 } 178 179 static struct resource * 180 ofwbus_alloc_resource(device_t bus, device_t child, int type, int *rid, 181 u_long start, u_long end, u_long count, u_int flags) 182 { 183 struct ofwbus_softc *sc; 184 struct rman *rm; 185 struct resource *rv; 186 struct resource_list_entry *rle; 187 int isdefault, passthrough; 188 189 isdefault = (start == 0UL && end == ~0UL); 190 passthrough = (device_get_parent(child) != bus); 191 sc = device_get_softc(bus); 192 rle = NULL; 193 if (!passthrough && isdefault) { 194 rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child), 195 type, *rid); 196 if (rle == NULL) { 197 if (bootverbose) 198 device_printf(bus, "no default resources for " 199 "rid = %d, type = %d\n", *rid, type); 200 return (NULL); 201 } 202 start = rle->start; 203 count = ulmax(count, rle->count); 204 end = ulmax(rle->end, start + count - 1); 205 } 206 207 switch (type) { 208 case SYS_RES_IRQ: 209 rm = &sc->sc_intr_rman; 210 break; 211 case SYS_RES_MEMORY: 212 rm = &sc->sc_mem_rman; 213 break; 214 default: 215 return (NULL); 216 } 217 218 rv = rman_reserve_resource(rm, start, end, count, flags & ~RF_ACTIVE, 219 child); 220 if (rv == NULL) 221 return (NULL); 222 rman_set_rid(rv, *rid); 223 224 if ((flags & RF_ACTIVE) != 0 && bus_activate_resource(child, type, 225 *rid, rv) != 0) { 226 rman_release_resource(rv); 227 return (NULL); 228 } 229 230 if (!passthrough && rle != NULL) { 231 rle->res = rv; 232 rle->start = rman_get_start(rv); 233 rle->end = rman_get_end(rv); 234 rle->count = rle->end - rle->start + 1; 235 } 236 237 return (rv); 238 } 239 240 static int 241 ofwbus_adjust_resource(device_t bus, device_t child __unused, int type, 242 struct resource *r, u_long start, u_long end) 243 { 244 struct ofwbus_softc *sc; 245 struct rman *rm; 246 device_t ofwbus; 247 248 ofwbus = bus; 249 while (strcmp(device_get_name(device_get_parent(ofwbus)), "root") != 0) 250 ofwbus = device_get_parent(ofwbus); 251 sc = device_get_softc(ofwbus); 252 switch (type) { 253 case SYS_RES_IRQ: 254 rm = &sc->sc_intr_rman; 255 break; 256 case SYS_RES_MEMORY: 257 rm = &sc->sc_mem_rman; 258 break; 259 default: 260 return (EINVAL); 261 } 262 if (rm == NULL) 263 return (ENXIO); 264 if (rman_is_region_manager(r, rm) == 0) 265 return (EINVAL); 266 return (rman_adjust_resource(r, start, end)); 267 } 268 269 static int 270 ofwbus_release_resource(device_t bus, device_t child, int type, 271 int rid, struct resource *r) 272 { 273 struct resource_list_entry *rle; 274 int error; 275 276 /* Clean resource list entry */ 277 rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child), type, rid); 278 if (rle != NULL) 279 rle->res = NULL; 280 281 if ((rman_get_flags(r) & RF_ACTIVE) != 0) { 282 error = bus_deactivate_resource(child, type, rid, r); 283 if (error) 284 return (error); 285 } 286 return (rman_release_resource(r)); 287 } 288