1 /* $NetBSD: mii.c,v 1.12 1999/08/03 19:41:49 drochner Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 /* 44 * MII bus layer, glues MII-capable network interface drivers to sharable 45 * PHY drivers. This exports an interface compatible with BSD/OS 3.0's, 46 * plus some NetBSD extensions. 47 */ 48 49 #include <sys/cdefs.h> 50 __FBSDID("$FreeBSD$"); 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/socket.h> 55 #include <sys/malloc.h> 56 #include <sys/module.h> 57 #include <sys/bus.h> 58 59 #include <net/if.h> 60 #include <net/if_media.h> 61 62 #include <dev/mii/mii.h> 63 #include <dev/mii/miivar.h> 64 65 MODULE_VERSION(miibus, 1); 66 67 #include "miibus_if.h" 68 69 static int miibus_readreg(device_t, int, int); 70 static int miibus_writereg(device_t, int, int, int); 71 static void miibus_statchg(device_t); 72 static void miibus_linkchg(device_t); 73 static void miibus_mediainit(device_t); 74 75 static device_method_t miibus_methods[] = { 76 /* device interface */ 77 DEVMETHOD(device_probe, miibus_probe), 78 DEVMETHOD(device_attach, miibus_attach), 79 DEVMETHOD(device_detach, miibus_detach), 80 DEVMETHOD(device_shutdown, bus_generic_shutdown), 81 82 /* bus interface */ 83 DEVMETHOD(bus_print_child, bus_generic_print_child), 84 DEVMETHOD(bus_driver_added, bus_generic_driver_added), 85 86 /* MII interface */ 87 DEVMETHOD(miibus_readreg, miibus_readreg), 88 DEVMETHOD(miibus_writereg, miibus_writereg), 89 DEVMETHOD(miibus_statchg, miibus_statchg), 90 DEVMETHOD(miibus_linkchg, miibus_linkchg), 91 DEVMETHOD(miibus_mediainit, miibus_mediainit), 92 93 { 0, 0 } 94 }; 95 96 devclass_t miibus_devclass; 97 98 driver_t miibus_driver = { 99 "miibus", 100 miibus_methods, 101 sizeof(struct mii_data) 102 }; 103 104 /* 105 * Helper function used by network interface drivers, attaches PHYs 106 * to the network interface driver parent. 107 */ 108 109 int 110 miibus_probe(dev) 111 device_t dev; 112 { 113 struct mii_attach_args ma, *args; 114 struct mii_data *mii; 115 device_t child = NULL, parent; 116 int bmsr, capmask = 0xFFFFFFFF; 117 118 mii = device_get_softc(dev); 119 parent = device_get_parent(dev); 120 LIST_INIT(&mii->mii_phys); 121 122 for (ma.mii_phyno = 0; ma.mii_phyno < MII_NPHY; ma.mii_phyno++) { 123 /* 124 * Check to see if there is a PHY at this address. Note, 125 * many braindead PHYs report 0/0 in their ID registers, 126 * so we test for media in the BMSR. 127 */ 128 bmsr = MIIBUS_READREG(parent, ma.mii_phyno, MII_BMSR); 129 if (bmsr == 0 || bmsr == 0xffff || 130 (bmsr & BMSR_MEDIAMASK) == 0) { 131 /* Assume no PHY at this address. */ 132 continue; 133 } 134 135 /* 136 * Extract the IDs. Braindead PHYs will be handled by 137 * the `ukphy' driver, as we have no ID information to 138 * match on. 139 */ 140 ma.mii_id1 = MIIBUS_READREG(parent, ma.mii_phyno, 141 MII_PHYIDR1); 142 ma.mii_id2 = MIIBUS_READREG(parent, ma.mii_phyno, 143 MII_PHYIDR2); 144 145 ma.mii_data = mii; 146 ma.mii_capmask = capmask; 147 148 args = malloc(sizeof(struct mii_attach_args), 149 M_DEVBUF, M_NOWAIT); 150 bcopy((char *)&ma, (char *)args, sizeof(ma)); 151 child = device_add_child(dev, NULL, -1); 152 device_set_ivars(child, args); 153 } 154 155 if (child == NULL) 156 return(ENXIO); 157 158 device_set_desc(dev, "MII bus"); 159 160 return(0); 161 } 162 163 int 164 miibus_attach(dev) 165 device_t dev; 166 { 167 void **v; 168 ifm_change_cb_t ifmedia_upd; 169 ifm_stat_cb_t ifmedia_sts; 170 struct mii_data *mii; 171 172 mii = device_get_softc(dev); 173 /* 174 * Note that each NIC's softc must start with an ifnet structure. 175 */ 176 mii->mii_ifp = device_get_softc(device_get_parent(dev)); 177 v = device_get_ivars(dev); 178 ifmedia_upd = v[0]; 179 ifmedia_sts = v[1]; 180 ifmedia_init(&mii->mii_media, IFM_IMASK, ifmedia_upd, ifmedia_sts); 181 bus_generic_attach(dev); 182 183 return(0); 184 } 185 186 int 187 miibus_detach(dev) 188 device_t dev; 189 { 190 struct mii_data *mii; 191 192 bus_generic_detach(dev); 193 mii = device_get_softc(dev); 194 ifmedia_removeall(&mii->mii_media); 195 mii->mii_ifp = NULL; 196 197 return(0); 198 } 199 200 static int 201 miibus_readreg(dev, phy, reg) 202 device_t dev; 203 int phy, reg; 204 { 205 device_t parent; 206 207 parent = device_get_parent(dev); 208 return(MIIBUS_READREG(parent, phy, reg)); 209 } 210 211 static int 212 miibus_writereg(dev, phy, reg, data) 213 device_t dev; 214 int phy, reg, data; 215 { 216 device_t parent; 217 218 parent = device_get_parent(dev); 219 return(MIIBUS_WRITEREG(parent, phy, reg, data)); 220 } 221 222 static void 223 miibus_statchg(dev) 224 device_t dev; 225 { 226 device_t parent; 227 228 parent = device_get_parent(dev); 229 MIIBUS_STATCHG(parent); 230 return; 231 } 232 233 static void 234 miibus_linkchg(dev) 235 device_t dev; 236 { 237 struct mii_data *mii; 238 struct ifnet *ifp; 239 device_t parent; 240 int link; 241 242 parent = device_get_parent(dev); 243 MIIBUS_LINKCHG(parent); 244 245 mii = device_get_softc(dev); 246 /* 247 * Note that each NIC's softc must start with an ifnet structure. 248 */ 249 ifp = device_get_softc(parent); 250 251 if (mii->mii_media_status & IFM_AVALID) { 252 if (mii->mii_media_status & IFM_ACTIVE) 253 link = NOTE_LINKUP; 254 else 255 link = NOTE_LINKDOWN; 256 } else { 257 link = NOTE_LINKINV; 258 } 259 260 KNOTE(&ifp->if_klist, link); 261 } 262 263 static void 264 miibus_mediainit(dev) 265 device_t dev; 266 { 267 struct mii_data *mii; 268 struct ifmedia_entry *m; 269 int media = 0; 270 271 /* Poke the parent in case it has any media of its own to add. */ 272 MIIBUS_MEDIAINIT(device_get_parent(dev)); 273 274 mii = device_get_softc(dev); 275 LIST_FOREACH(m, &mii->mii_media.ifm_list, ifm_list) { 276 media = m->ifm_media; 277 if (media == (IFM_ETHER|IFM_AUTO)) 278 break; 279 } 280 281 ifmedia_set(&mii->mii_media, media); 282 283 return; 284 } 285 286 int 287 mii_phy_probe(dev, child, ifmedia_upd, ifmedia_sts) 288 device_t dev; 289 device_t *child; 290 ifm_change_cb_t ifmedia_upd; 291 ifm_stat_cb_t ifmedia_sts; 292 { 293 void **v; 294 int bmsr, i; 295 296 v = malloc(sizeof(vm_offset_t) * 2, M_DEVBUF, M_NOWAIT); 297 if (v == 0) { 298 return (ENOMEM); 299 } 300 v[0] = ifmedia_upd; 301 v[1] = ifmedia_sts; 302 *child = device_add_child(dev, "miibus", -1); 303 device_set_ivars(*child, v); 304 305 for (i = 0; i < MII_NPHY; i++) { 306 bmsr = MIIBUS_READREG(dev, i, MII_BMSR); 307 if (bmsr == 0 || bmsr == 0xffff || 308 (bmsr & BMSR_MEDIAMASK) == 0) { 309 /* Assume no PHY at this address. */ 310 continue; 311 } else 312 break; 313 } 314 315 if (i == MII_NPHY) { 316 device_delete_child(dev, *child); 317 *child = NULL; 318 return(ENXIO); 319 } 320 321 bus_generic_attach(dev); 322 323 return(0); 324 } 325 326 /* 327 * Media changed; notify all PHYs. 328 */ 329 int 330 mii_mediachg(mii) 331 struct mii_data *mii; 332 { 333 struct mii_softc *child; 334 int rv; 335 336 mii->mii_media_status = 0; 337 mii->mii_media_active = IFM_NONE; 338 339 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 340 rv = (*child->mii_service)(child, mii, MII_MEDIACHG); 341 if (rv) 342 return (rv); 343 } 344 return (0); 345 } 346 347 /* 348 * Call the PHY tick routines, used during autonegotiation. 349 */ 350 void 351 mii_tick(mii) 352 struct mii_data *mii; 353 { 354 struct mii_softc *child; 355 356 LIST_FOREACH(child, &mii->mii_phys, mii_list) 357 (void) (*child->mii_service)(child, mii, MII_TICK); 358 } 359 360 /* 361 * Get media status from PHYs. 362 */ 363 void 364 mii_pollstat(mii) 365 struct mii_data *mii; 366 { 367 struct mii_softc *child; 368 369 mii->mii_media_status = 0; 370 mii->mii_media_active = IFM_NONE; 371 372 LIST_FOREACH(child, &mii->mii_phys, mii_list) 373 (void) (*child->mii_service)(child, mii, MII_POLLSTAT); 374 } 375 376 /* 377 * Inform the PHYs that the interface is down. 378 */ 379 void 380 mii_down(struct mii_data *mii) 381 { 382 struct mii_softc *child; 383 384 LIST_FOREACH(child, &mii->mii_phys, mii_list) 385 mii_phy_down(child); 386 } 387