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/param.h> 50 #include <sys/systm.h> 51 #include <sys/socket.h> 52 #include <sys/malloc.h> 53 #include <sys/module.h> 54 #include <sys/bus.h> 55 56 #include <net/if.h> 57 #include <net/if_media.h> 58 #include <net/route.h> 59 60 #include <dev/mii/mii.h> 61 #include <dev/mii/miivar.h> 62 63 MODULE_VERSION(miibus, 1); 64 65 #include "miibus_if.h" 66 67 static int miibus_readreg(device_t, int, int); 68 static int miibus_writereg(device_t, int, int, int); 69 static void miibus_statchg(device_t); 70 static void miibus_linkchg(device_t); 71 static void miibus_mediainit(device_t); 72 73 static device_method_t miibus_methods[] = { 74 /* device interface */ 75 DEVMETHOD(device_probe, miibus_probe), 76 DEVMETHOD(device_attach, miibus_attach), 77 DEVMETHOD(device_detach, miibus_detach), 78 DEVMETHOD(device_shutdown, bus_generic_shutdown), 79 80 /* bus interface */ 81 DEVMETHOD(bus_print_child, bus_generic_print_child), 82 DEVMETHOD(bus_driver_added, bus_generic_driver_added), 83 84 /* MII interface */ 85 DEVMETHOD(miibus_readreg, miibus_readreg), 86 DEVMETHOD(miibus_writereg, miibus_writereg), 87 DEVMETHOD(miibus_statchg, miibus_statchg), 88 DEVMETHOD(miibus_linkchg, miibus_linkchg), 89 DEVMETHOD(miibus_mediainit, miibus_mediainit), 90 91 { 0, 0 } 92 }; 93 94 devclass_t miibus_devclass; 95 96 driver_t miibus_driver = { 97 "miibus", 98 miibus_methods, 99 sizeof(struct mii_data) 100 }; 101 102 /* 103 * Helper function used by network interface drivers, attaches PHYs 104 * to the network interface driver parent. 105 */ 106 107 int 108 miibus_probe(dev) 109 device_t dev; 110 { 111 struct mii_attach_args ma, *args; 112 struct mii_data *mii; 113 device_t child = NULL, parent; 114 int bmsr, capmask = 0xFFFFFFFF; 115 116 mii = device_get_softc(dev); 117 parent = device_get_parent(dev); 118 LIST_INIT(&mii->mii_phys); 119 120 for (ma.mii_phyno = 0; ma.mii_phyno < MII_NPHY; ma.mii_phyno++) { 121 /* 122 * Check to see if there is a PHY at this address. Note, 123 * many braindead PHYs report 0/0 in their ID registers, 124 * so we test for media in the BMSR. 125 */ 126 bmsr = MIIBUS_READREG(parent, ma.mii_phyno, MII_BMSR); 127 if (bmsr == 0 || bmsr == 0xffff || 128 (bmsr & (BMSR_EXTSTAT|BMSR_MEDIAMASK)) == 0) { 129 /* Assume no PHY at this address. */ 130 continue; 131 } 132 133 /* 134 * Extract the IDs. Braindead PHYs will be handled by 135 * the `ukphy' driver, as we have no ID information to 136 * match on. 137 */ 138 ma.mii_id1 = MIIBUS_READREG(parent, ma.mii_phyno, 139 MII_PHYIDR1); 140 ma.mii_id2 = MIIBUS_READREG(parent, ma.mii_phyno, 141 MII_PHYIDR2); 142 143 ma.mii_data = mii; 144 ma.mii_capmask = capmask; 145 146 args = malloc(sizeof(struct mii_attach_args), 147 M_DEVBUF, M_NOWAIT); 148 bcopy((char *)&ma, (char *)args, sizeof(ma)); 149 child = device_add_child(dev, NULL, -1); 150 device_set_ivars(child, args); 151 } 152 153 if (child == NULL) 154 return(ENXIO); 155 156 device_set_desc(dev, "MII bus"); 157 158 return(0); 159 } 160 161 int 162 miibus_attach(dev) 163 device_t dev; 164 { 165 void **v; 166 ifm_change_cb_t ifmedia_upd; 167 ifm_stat_cb_t ifmedia_sts; 168 struct mii_data *mii; 169 170 mii = device_get_softc(dev); 171 /* 172 * Note that each NIC's softc must start with an ifnet structure. 173 */ 174 mii->mii_ifp = device_get_softc(device_get_parent(dev)); 175 v = device_get_ivars(dev); 176 ifmedia_upd = v[0]; 177 ifmedia_sts = v[1]; 178 ifmedia_init(&mii->mii_media, IFM_IMASK, ifmedia_upd, ifmedia_sts); 179 bus_generic_attach(dev); 180 181 return(0); 182 } 183 184 int 185 miibus_detach(dev) 186 device_t dev; 187 { 188 struct mii_data *mii; 189 190 bus_generic_detach(dev); 191 mii = device_get_softc(dev); 192 ifmedia_removeall(&mii->mii_media); 193 mii->mii_ifp = NULL; 194 195 return(0); 196 } 197 198 static int 199 miibus_readreg(dev, phy, reg) 200 device_t dev; 201 int phy, reg; 202 { 203 device_t parent; 204 205 parent = device_get_parent(dev); 206 return(MIIBUS_READREG(parent, phy, reg)); 207 } 208 209 static int 210 miibus_writereg(dev, phy, reg, data) 211 device_t dev; 212 int phy, reg, data; 213 { 214 device_t parent; 215 216 parent = device_get_parent(dev); 217 return(MIIBUS_WRITEREG(parent, phy, reg, data)); 218 } 219 220 static void 221 miibus_statchg(dev) 222 device_t dev; 223 { 224 device_t parent; 225 226 parent = device_get_parent(dev); 227 MIIBUS_STATCHG(parent); 228 return; 229 } 230 231 static void 232 miibus_linkchg(dev) 233 device_t dev; 234 { 235 struct mii_data *mii; 236 device_t parent; 237 int link_state; 238 239 parent = device_get_parent(dev); 240 MIIBUS_LINKCHG(parent); 241 242 mii = device_get_softc(dev); 243 244 if (mii->mii_media_status & IFM_AVALID) { 245 if (mii->mii_media_status & IFM_ACTIVE) 246 link_state = LINK_STATE_UP; 247 else 248 link_state = LINK_STATE_DOWN; 249 } else 250 link_state = LINK_STATE_UNKNOWN; 251 /* 252 * Note that each NIC's softc must start with an ifnet structure. 253 */ 254 if_link_state_change(device_get_softc(parent), link_state); 255 } 256 257 static void 258 miibus_mediainit(dev) 259 device_t dev; 260 { 261 struct mii_data *mii; 262 struct ifmedia_entry *m; 263 int media = 0; 264 265 /* Poke the parent in case it has any media of its own to add. */ 266 MIIBUS_MEDIAINIT(device_get_parent(dev)); 267 268 mii = device_get_softc(dev); 269 LIST_FOREACH(m, &mii->mii_media.ifm_list, ifm_list) { 270 media = m->ifm_media; 271 if (media == (IFM_ETHER|IFM_AUTO)) 272 break; 273 } 274 275 ifmedia_set(&mii->mii_media, media); 276 277 return; 278 } 279 280 int 281 mii_phy_probe(dev, child, ifmedia_upd, ifmedia_sts) 282 device_t dev; 283 device_t *child; 284 ifm_change_cb_t ifmedia_upd; 285 ifm_stat_cb_t ifmedia_sts; 286 { 287 void **v; 288 int bmsr, i; 289 290 v = malloc(sizeof(vm_offset_t) * 2, M_DEVBUF, M_NOWAIT); 291 if (v == 0) { 292 return (ENOMEM); 293 } 294 v[0] = ifmedia_upd; 295 v[1] = ifmedia_sts; 296 *child = device_add_child(dev, "miibus", -1); 297 device_set_ivars(*child, v); 298 299 for (i = 0; i < MII_NPHY; i++) { 300 bmsr = MIIBUS_READREG(dev, i, MII_BMSR); 301 if (bmsr == 0 || bmsr == 0xffff || 302 (bmsr & (BMSR_EXTSTAT|BMSR_MEDIAMASK)) == 0) { 303 /* Assume no PHY at this address. */ 304 continue; 305 } else 306 break; 307 } 308 309 if (i == MII_NPHY) { 310 device_delete_child(dev, *child); 311 *child = NULL; 312 return(ENXIO); 313 } 314 315 bus_generic_attach(dev); 316 317 return(0); 318 } 319 320 /* 321 * Media changed; notify all PHYs. 322 */ 323 int 324 mii_mediachg(mii) 325 struct mii_data *mii; 326 { 327 struct mii_softc *child; 328 int rv; 329 330 mii->mii_media_status = 0; 331 mii->mii_media_active = IFM_NONE; 332 333 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 334 rv = (*child->mii_service)(child, mii, MII_MEDIACHG); 335 if (rv) 336 return (rv); 337 } 338 return (0); 339 } 340 341 /* 342 * Call the PHY tick routines, used during autonegotiation. 343 */ 344 void 345 mii_tick(mii) 346 struct mii_data *mii; 347 { 348 struct mii_softc *child; 349 350 LIST_FOREACH(child, &mii->mii_phys, mii_list) 351 (void) (*child->mii_service)(child, mii, MII_TICK); 352 } 353 354 /* 355 * Get media status from PHYs. 356 */ 357 void 358 mii_pollstat(mii) 359 struct mii_data *mii; 360 { 361 struct mii_softc *child; 362 363 mii->mii_media_status = 0; 364 mii->mii_media_active = IFM_NONE; 365 366 LIST_FOREACH(child, &mii->mii_phys, mii_list) 367 (void) (*child->mii_service)(child, mii, MII_POLLSTAT); 368 } 369 370 /* 371 * Inform the PHYs that the interface is down. 372 */ 373 void 374 mii_down(struct mii_data *mii) 375 { 376 struct mii_softc *child; 377 378 LIST_FOREACH(child, &mii->mii_phys, mii_list) 379 mii_phy_down(child); 380 } 381