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 69struct 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__ 76static device_identify_t ofwbus_identify; 77#endif 78static device_probe_t ofwbus_probe; 79static device_attach_t ofwbus_attach; 80static bus_alloc_resource_t ofwbus_alloc_resource; 81static bus_adjust_resource_t ofwbus_adjust_resource; 82static bus_release_resource_t ofwbus_release_resource; 83 84static 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 100DEFINE_CLASS_1(ofwbus, ofwbus_driver, ofwbus_methods, 101 sizeof(struct ofwbus_softc), simplebus_driver); 102static devclass_t ofwbus_devclass; 103EARLY_DRIVER_MODULE(ofwbus, nexus, ofwbus_driver, ofwbus_devclass, 0, 0, 104 BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 105MODULE_VERSION(ofwbus, 1); 106 107#ifndef __aarch64__ 108static void 109ofwbus_identify(driver_t *driver, device_t parent) 110{ 111 112 /* Check if Open Firmware has been instantiated */ 113 if (OF_peer(0) == 0) 114 return; 115 116 if (device_find_child(parent, "ofwbus", -1) == NULL) 117 BUS_ADD_CHILD(parent, 0, "ofwbus", -1); 118} 119#endif 120 121static int 122ofwbus_probe(device_t dev) 123{ 124 125#ifdef __aarch64__ 126 if (OF_peer(0) == 0) 127 return (ENXIO); 128#endif 129 130 device_set_desc(dev, "Open Firmware Device Tree"); 131 return (BUS_PROBE_NOWILDCARD); 132} 133 134static int 135ofwbus_attach(device_t dev) 136{ 137 struct ofwbus_softc *sc; 138 phandle_t node; 139 struct ofw_bus_devinfo obd; 140 141 sc = device_get_softc(dev); 142 143 node = OF_peer(0); 144 145 /* 146 * If no Open Firmware, bail early 147 */ 148 if (node == -1) 149 return (ENXIO); 150 151 /* 152 * ofwbus bus starts on unamed node in FDT, so we cannot make 153 * ofw_bus_devinfo from it. Pass node to simplebus_init directly. 154 */ 155 simplebus_init(dev, node); 156 sc->sc_intr_rman.rm_type = RMAN_ARRAY; 157 sc->sc_intr_rman.rm_descr = "Interrupts"; 158 sc->sc_mem_rman.rm_type = RMAN_ARRAY; 159 sc->sc_mem_rman.rm_descr = "Device Memory"; 160 if (rman_init(&sc->sc_intr_rman) != 0 || 161 rman_init(&sc->sc_mem_rman) != 0 || 162 rman_manage_region(&sc->sc_intr_rman, 0, ~0) != 0 || 163 rman_manage_region(&sc->sc_mem_rman, 0, BUS_SPACE_MAXADDR) != 0) 164 panic("%s: failed to set up rmans.", __func__); 165 166 /* 167 * Allow devices to identify. 168 */ 169 bus_generic_probe(dev); 170 171 /* 172 * Now walk the OFW tree and attach top-level devices. 173 */ 174 for (node = OF_child(node); node > 0; node = OF_peer(node)) { 175 if (ofw_bus_gen_setup_devinfo(&obd, node) != 0) 176 continue; 177 simplebus_add_device(dev, node, 0, NULL, -1, NULL); 178 } 179 return (bus_generic_attach(dev)); 180} 181 182static struct resource * 183ofwbus_alloc_resource(device_t bus, device_t child, int type, int *rid, 184 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 185{ 186 struct ofwbus_softc *sc; 187 struct rman *rm; 188 struct resource *rv; 189 struct resource_list_entry *rle; 190 int isdefault, passthrough; 191 192 isdefault = RMAN_IS_DEFAULT_RANGE(start, end); 193 passthrough = (device_get_parent(child) != bus); 194 sc = device_get_softc(bus); 195 rle = NULL; 196 if (!passthrough && isdefault) { 197 rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child), 198 type, *rid); 199 if (rle == NULL) { 200 if (bootverbose) 201 device_printf(bus, "no default resources for " 202 "rid = %d, type = %d\n", *rid, type); 203 return (NULL); 204 } 205 start = rle->start; 206 count = ummax(count, rle->count); 207 end = ummax(rle->end, start + count - 1); 208 } 209 210 switch (type) { 211 case SYS_RES_IRQ: 212 rm = &sc->sc_intr_rman; 213 break; 214 case SYS_RES_MEMORY: 215 rm = &sc->sc_mem_rman; 216 break; 217 default: 218 return (NULL); 219 } 220 221 rv = rman_reserve_resource(rm, start, end, count, flags & ~RF_ACTIVE, 222 child); 223 if (rv == NULL) 224 return (NULL); 225 rman_set_rid(rv, *rid); 226 227 if ((flags & RF_ACTIVE) != 0 && bus_activate_resource(child, type, 228 *rid, rv) != 0) { 229 rman_release_resource(rv); 230 return (NULL); 231 } 232 233 if (!passthrough && rle != NULL) { 234 rle->res = rv; 235 rle->start = rman_get_start(rv); 236 rle->end = rman_get_end(rv); 237 rle->count = rle->end - rle->start + 1; 238 } 239 240 return (rv); 241} 242 243static int 244ofwbus_adjust_resource(device_t bus, device_t child __unused, int type, 245 struct resource *r, rman_res_t start, rman_res_t end) 246{ 247 struct ofwbus_softc *sc; 248 struct rman *rm; 249 device_t ofwbus; 250 251 ofwbus = bus; 252 while (strcmp(device_get_name(device_get_parent(ofwbus)), "root") != 0) 253 ofwbus = device_get_parent(ofwbus); 254 sc = device_get_softc(ofwbus); 255 switch (type) { 256 case SYS_RES_IRQ: 257 rm = &sc->sc_intr_rman; 258 break; 259 case SYS_RES_MEMORY: 260 rm = &sc->sc_mem_rman; 261 break; 262 default: 263 return (EINVAL); 264 } 265 if (rm == NULL) 266 return (ENXIO); 267 if (rman_is_region_manager(r, rm) == 0) 268 return (EINVAL); 269 return (rman_adjust_resource(r, start, end)); 270} 271 272static int 273ofwbus_release_resource(device_t bus, device_t child, int type, 274 int rid, struct resource *r) 275{ 276 struct resource_list_entry *rle; 277 int passthrough; 278 int error; 279 280 passthrough = (device_get_parent(child) != bus); 281 if (!passthrough) { 282 /* Clean resource list entry */ 283 rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child), 284 type, rid); 285 if (rle != NULL) 286 rle->res = NULL; 287 } 288 289 if ((rman_get_flags(r) & RF_ACTIVE) != 0) { 290 error = bus_deactivate_resource(child, type, rid, r); 291 if (error) 292 return (error); 293 } 294 return (rman_release_resource(r)); 295} 296