1 /* $NetBSD: mii.c,v 1.59 2024/02/08 20:11:55 andvar Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2000, 2020 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * MII bus layer, glues MII-capable network interface drivers to shareable 35 * PHY drivers. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: mii.c,v 1.59 2024/02/08 20:11:55 andvar Exp $"); 40 41 #define __IFMEDIA_PRIVATE 42 43 #include <sys/param.h> 44 #include <sys/device.h> 45 #include <sys/systm.h> 46 #include <sys/socket.h> 47 48 #include <net/if.h> 49 #include <net/if_media.h> 50 51 #include <dev/mii/mii.h> 52 #include <dev/mii/miivar.h> 53 54 #include "locators.h" 55 56 static int mii_print(void *, const char *); 57 58 /* 59 * Helper function used by network interface drivers, attaches PHYs 60 * to the network interface driver parent. 61 */ 62 void 63 mii_attach(device_t parent, struct mii_data *mii, int capmask, 64 int phyloc, int offloc, int flags) 65 { 66 struct mii_attach_args ma; 67 struct mii_softc *child; 68 int offset = 0; 69 uint16_t bmsr; 70 int phymin, phymax; 71 int locs[MIICF_NLOCS]; 72 int rv; 73 74 KASSERT(mii->mii_media.ifm_lock != NULL); 75 76 if (phyloc != MII_PHY_ANY && offloc != MII_OFFSET_ANY) 77 panic("mii_attach: phyloc and offloc specified"); 78 79 if (phyloc == MII_PHY_ANY) { 80 phymin = 0; 81 phymax = MII_NPHY - 1; 82 } else 83 phymin = phymax = phyloc; 84 85 mii_lock(mii); 86 87 if ((mii->mii_flags & MIIF_INITDONE) == 0) { 88 LIST_INIT(&mii->mii_phys); 89 cv_init(&mii->mii_probe_cv, "mii_attach"); 90 mii->mii_flags |= MIIF_INITDONE; 91 } 92 93 /* 94 * Probing temporarily unlocks the MII; wait until anyone 95 * else who might be doing this to finish. 96 */ 97 mii->mii_probe_waiters++; 98 for (;;) { 99 if (mii->mii_flags & MIIF_EXITING) { 100 mii->mii_probe_waiters--; 101 cv_signal(&mii->mii_probe_cv); 102 mii_unlock(mii); 103 return; 104 } 105 if ((mii->mii_flags & MIIF_PROBING) == 0) 106 break; 107 cv_wait(&mii->mii_probe_cv, mii->mii_media.ifm_lock); 108 } 109 mii->mii_probe_waiters--; 110 111 /* ...and old others off. */ 112 mii->mii_flags |= MIIF_PROBING; 113 114 for (ma.mii_phyno = phymin; ma.mii_phyno <= phymax; ma.mii_phyno++) { 115 /* 116 * Make sure we haven't already configured a PHY at this 117 * address. This allows mii_attach() to be called 118 * multiple times. 119 */ 120 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 121 if (child->mii_phy == ma.mii_phyno) { 122 /* 123 * Yes, there is already something 124 * configured at this address. 125 */ 126 offset++; 127 continue; 128 } 129 } 130 131 /* 132 * Check to see if there is a PHY at this address. Note, 133 * many braindead PHYs report 0/0 in their ID registers, 134 * so we test for media in the BMSR. 135 */ 136 bmsr = 0; 137 rv = (*mii->mii_readreg)(parent, ma.mii_phyno, MII_BMSR, 138 &bmsr); 139 if ((rv != 0) || bmsr == 0 || bmsr == 0xffff || 140 (bmsr & (BMSR_EXTSTAT | BMSR_MEDIAMASK)) == 0) { 141 /* Assume no PHY at this address. */ 142 continue; 143 } 144 145 /* 146 * There is a PHY at this address. If we were given an 147 * `offset' locator, skip this PHY if it doesn't match. 148 */ 149 if (offloc != MII_OFFSET_ANY && offloc != offset) { 150 offset++; 151 continue; 152 } 153 154 /* 155 * Extract the IDs. Braindead PHYs will be handled by 156 * the `ukphy' driver, as we have no ID information to 157 * match on. 158 */ 159 ma.mii_id1 = ma.mii_id2 = 0; 160 rv = (*mii->mii_readreg)(parent, ma.mii_phyno, 161 MII_PHYIDR1, &ma.mii_id1); 162 rv |= (*mii->mii_readreg)(parent, ma.mii_phyno, 163 MII_PHYIDR2, &ma.mii_id2); 164 if (rv != 0) 165 continue; 166 167 ma.mii_data = mii; 168 ma.mii_capmask = capmask; 169 ma.mii_flags = flags | (mii->mii_flags & MIIF_INHERIT_MASK); 170 171 locs[MIICF_PHY] = ma.mii_phyno; 172 173 mii_unlock(mii); 174 175 child = device_private( 176 config_found(parent, &ma, mii_print, 177 CFARGS(.submatch = config_stdsubmatch, 178 .iattr = "mii", 179 .locators = locs))); 180 if (child) { 181 /* Link it up in the parent's MII data. */ 182 if (child->mii_flags & MIIF_AUTOTSLEEP) 183 cv_init(&child->mii_nway_cv, "miiauto"); 184 else 185 callout_init(&child->mii_nway_ch, 0); 186 mii_lock(mii); 187 LIST_INSERT_HEAD(&mii->mii_phys, child, mii_list); 188 child->mii_offset = offset; 189 mii->mii_instance++; 190 } else { 191 mii_lock(mii); 192 } 193 offset++; 194 } 195 196 /* All done! */ 197 mii->mii_flags &= ~MIIF_PROBING; 198 cv_signal(&mii->mii_probe_cv); 199 mii_unlock(mii); 200 } 201 202 void 203 mii_detach(struct mii_data *mii, int phyloc, int offloc) 204 { 205 struct mii_softc *child, *nchild; 206 bool exiting = false; 207 208 if (phyloc != MII_PHY_ANY && offloc != MII_PHY_ANY) 209 panic("mii_detach: phyloc and offloc specified"); 210 211 mii_lock(mii); 212 213 if ((mii->mii_flags & MIIF_INITDONE) == 0 || 214 (mii->mii_flags & MIIF_EXITING) != 0) { 215 mii_unlock(mii); 216 return; 217 } 218 219 /* 220 * XXX This is probably not the best hueristic. Consider 221 * XXX adding an argument to mii_detach(). 222 */ 223 if (phyloc == MII_PHY_ANY && MII_PHY_ANY == MII_OFFSET_ANY) 224 exiting = true; 225 226 if (exiting) { 227 mii->mii_flags |= MIIF_EXITING; 228 cv_broadcast(&mii->mii_probe_cv); 229 } 230 231 /* Wait for everyone else to get out. */ 232 mii->mii_probe_waiters++; 233 for (;;) { 234 /* 235 * If we've been waiting to do a less-than-exit, and 236 * *someone else* initiated an exit, then get out. 237 */ 238 if (!exiting && (mii->mii_flags & MIIF_EXITING) != 0) { 239 mii->mii_probe_waiters--; 240 cv_signal(&mii->mii_probe_cv); 241 mii_unlock(mii); 242 return; 243 } 244 if ((mii->mii_flags & MIIF_PROBING) == 0 && 245 (!exiting || (exiting && mii->mii_probe_waiters == 1))) 246 break; 247 cv_wait(&mii->mii_probe_cv, mii->mii_media.ifm_lock); 248 } 249 mii->mii_probe_waiters--; 250 251 if (!exiting) 252 mii->mii_flags |= MIIF_PROBING; 253 254 LIST_FOREACH_SAFE(child, &mii->mii_phys, mii_list, nchild) { 255 if (phyloc != MII_PHY_ANY || offloc != MII_OFFSET_ANY) { 256 if (phyloc != MII_PHY_ANY && 257 phyloc != child->mii_phy) 258 continue; 259 if (offloc != MII_OFFSET_ANY && 260 offloc != child->mii_offset) 261 continue; 262 } 263 LIST_REMOVE(child, mii_list); 264 mii_unlock(mii); 265 (void)config_detach(child->mii_dev, DETACH_FORCE); 266 mii_lock(mii); 267 } 268 269 if (exiting) { 270 cv_destroy(&mii->mii_probe_cv); 271 } else { 272 mii->mii_flags &= ~MIIF_PROBING; 273 cv_signal(&mii->mii_probe_cv); 274 } 275 276 mii_unlock(mii); 277 } 278 279 static int 280 mii_print(void *aux, const char *pnp) 281 { 282 struct mii_attach_args *ma = aux; 283 284 if (pnp != NULL) 285 aprint_normal("OUI 0x%06x model 0x%04x rev %d at %s", 286 MII_OUI(ma->mii_id1, ma->mii_id2), MII_MODEL(ma->mii_id2), 287 MII_REV(ma->mii_id2), pnp); 288 289 aprint_normal(" phy %d", ma->mii_phyno); 290 return UNCONF; 291 } 292 293 static inline int 294 phy_service(struct mii_softc *sc, struct mii_data *mii, int cmd) 295 { 296 297 if (!device_is_active(sc->mii_dev)) 298 return ENXIO; 299 return PHY_SERVICE(sc, mii, cmd); 300 } 301 302 int 303 mii_ifmedia_change(struct mii_data *mii) 304 { 305 306 KASSERT(mii_locked(mii) || 307 ifmedia_islegacy(&mii->mii_media)); 308 return ifmedia_change(&mii->mii_media, mii->mii_ifp); 309 } 310 311 /* 312 * Media changed; notify all PHYs. 313 */ 314 int 315 mii_mediachg(struct mii_data *mii) 316 { 317 struct mii_softc *child; 318 int rv = 0; 319 320 IFMEDIA_LOCK_FOR_LEGACY(&mii->mii_media); 321 KASSERT(mii_locked(mii)); 322 323 mii->mii_media_status = 0; 324 mii->mii_media_active = IFM_NONE; 325 326 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 327 rv = phy_service(child, mii, MII_MEDIACHG); 328 if (rv) 329 break; 330 } 331 IFMEDIA_UNLOCK_FOR_LEGACY(&mii->mii_media); 332 return rv; 333 } 334 335 /* 336 * Call the PHY tick routines, used during autonegotiation. 337 */ 338 void 339 mii_tick(struct mii_data *mii) 340 { 341 struct mii_softc *child; 342 343 IFMEDIA_LOCK_FOR_LEGACY(&mii->mii_media); 344 KASSERT(mii_locked(mii)); 345 346 LIST_FOREACH(child, &mii->mii_phys, mii_list) 347 (void)phy_service(child, mii, MII_TICK); 348 349 IFMEDIA_UNLOCK_FOR_LEGACY(&mii->mii_media); 350 } 351 352 /* 353 * Get media status from PHYs. 354 */ 355 void 356 mii_pollstat(struct mii_data *mii) 357 { 358 struct mii_softc *child; 359 360 IFMEDIA_LOCK_FOR_LEGACY(&mii->mii_media); 361 KASSERT(mii_locked(mii)); 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)phy_service(child, mii, MII_POLLSTAT); 368 369 IFMEDIA_UNLOCK_FOR_LEGACY(&mii->mii_media); 370 } 371 372 /* 373 * Inform the PHYs that the interface is down. 374 */ 375 void 376 mii_down(struct mii_data *mii) 377 { 378 struct mii_softc *child; 379 380 IFMEDIA_LOCK_FOR_LEGACY(&mii->mii_media); 381 KASSERT(mii_locked(mii)); 382 383 LIST_FOREACH(child, &mii->mii_phys, mii_list) 384 (void)phy_service(child, mii, MII_DOWN); 385 386 IFMEDIA_UNLOCK_FOR_LEGACY(&mii->mii_media); 387 } 388 389 static unsigned char 390 bitreverse(unsigned char x) 391 { 392 static const unsigned char nibbletab[16] = { 393 0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15 394 }; 395 396 return ((nibbletab[x & 15] << 4) | nibbletab[x >> 4]); 397 } 398 399 u_int 400 mii_oui(uint16_t id1, uint16_t id2) 401 { 402 u_int h; 403 404 h = (id1 << 6) | (id2 >> 10); 405 406 return ((bitreverse(h >> 16) << 16) | 407 (bitreverse((h >> 8) & 255) << 8) | 408 bitreverse(h & 255)); 409 } 410
Indexes created Wed Sep 24 02:09:48 GMT 2025