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