1 /* $NetBSD: mii.c,v 1.54 2019/04/09 11:28:45 msaitoh Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2000 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 sharable 35 * PHY drivers. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: mii.c,v 1.54 2019/04/09 11:28:45 msaitoh Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/device.h> 43 #include <sys/systm.h> 44 #include <sys/socket.h> 45 46 #include <net/if.h> 47 #include <net/if_media.h> 48 49 #include <dev/mii/mii.h> 50 #include <dev/mii/miivar.h> 51 52 #include "locators.h" 53 54 static int mii_print(void *, const char *); 55 56 /* 57 * Helper function used by network interface drivers, attaches PHYs 58 * to the network interface driver parent. 59 */ 60 void 61 mii_attach(device_t parent, struct mii_data *mii, int capmask, 62 int phyloc, int offloc, int flags) 63 { 64 struct mii_attach_args ma; 65 struct mii_softc *child; 66 int offset = 0; 67 uint16_t bmsr; 68 int phymin, phymax; 69 int locs[MIICF_NLOCS]; 70 int rv; 71 72 if (phyloc != MII_PHY_ANY && offloc != MII_OFFSET_ANY) 73 panic("mii_attach: phyloc and offloc specified"); 74 75 if (phyloc == MII_PHY_ANY) { 76 phymin = 0; 77 phymax = MII_NPHY - 1; 78 } else 79 phymin = phymax = phyloc; 80 81 if ((mii->mii_flags & MIIF_INITDONE) == 0) { 82 LIST_INIT(&mii->mii_phys); 83 mii->mii_flags |= MIIF_INITDONE; 84 } 85 86 for (ma.mii_phyno = phymin; ma.mii_phyno <= phymax; ma.mii_phyno++) { 87 /* 88 * Make sure we haven't already configured a PHY at this 89 * address. This allows mii_attach() to be called 90 * multiple times. 91 */ 92 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 93 if (child->mii_phy == ma.mii_phyno) { 94 /* 95 * Yes, there is already something 96 * configured at this address. 97 */ 98 offset++; 99 continue; 100 } 101 } 102 103 /* 104 * Check to see if there is a PHY at this address. Note, 105 * many braindead PHYs report 0/0 in their ID registers, 106 * so we test for media in the BMSR. 107 */ 108 bmsr = 0; 109 rv = (*mii->mii_readreg)(parent, ma.mii_phyno, MII_BMSR, 110 &bmsr); 111 if ((rv != 0) || bmsr == 0 || bmsr == 0xffff || 112 (bmsr & (BMSR_EXTSTAT | BMSR_MEDIAMASK)) == 0) { 113 /* Assume no PHY at this address. */ 114 continue; 115 } 116 117 /* 118 * There is a PHY at this address. If we were given an 119 * `offset' locator, skip this PHY if it doesn't match. 120 */ 121 if (offloc != MII_OFFSET_ANY && offloc != offset) { 122 offset++; 123 continue; 124 } 125 126 /* 127 * Extract the IDs. Braindead PHYs will be handled by 128 * the `ukphy' driver, as we have no ID information to 129 * match on. 130 */ 131 ma.mii_id1 = ma.mii_id2 = 0; 132 rv = (*mii->mii_readreg)(parent, ma.mii_phyno, 133 MII_PHYIDR1, &ma.mii_id1); 134 rv |= (*mii->mii_readreg)(parent, ma.mii_phyno, 135 MII_PHYIDR2, &ma.mii_id2); 136 if (rv != 0) 137 continue; 138 139 ma.mii_data = mii; 140 ma.mii_capmask = capmask; 141 ma.mii_flags = flags | (mii->mii_flags & MIIF_INHERIT_MASK); 142 143 locs[MIICF_PHY] = ma.mii_phyno; 144 145 child = device_private(config_found_sm_loc(parent, "mii", 146 locs, &ma, mii_print, config_stdsubmatch)); 147 if (child) { 148 /* Link it up in the parent's MII data. */ 149 callout_init(&child->mii_nway_ch, 0); 150 LIST_INSERT_HEAD(&mii->mii_phys, child, mii_list); 151 child->mii_offset = offset; 152 mii->mii_instance++; 153 } 154 offset++; 155 } 156 } 157 158 void 159 mii_detach(struct mii_data *mii, int phyloc, int offloc) 160 { 161 struct mii_softc *child, *nchild; 162 163 if (phyloc != MII_PHY_ANY && offloc != MII_PHY_ANY) 164 panic("mii_detach: phyloc and offloc specified"); 165 166 if ((mii->mii_flags & MIIF_INITDONE) == 0) 167 return; 168 169 for (child = LIST_FIRST(&mii->mii_phys); 170 child != NULL; child = nchild) { 171 nchild = LIST_NEXT(child, mii_list); 172 if (phyloc != MII_PHY_ANY || offloc != MII_OFFSET_ANY) { 173 if (phyloc != MII_PHY_ANY && 174 phyloc != child->mii_phy) 175 continue; 176 if (offloc != MII_OFFSET_ANY && 177 offloc != child->mii_offset) 178 continue; 179 } 180 (void)config_detach(child->mii_dev, DETACH_FORCE); 181 } 182 } 183 184 static int 185 mii_print(void *aux, const char *pnp) 186 { 187 struct mii_attach_args *ma = aux; 188 189 if (pnp != NULL) 190 aprint_normal("OUI 0x%06x model 0x%04x rev %d at %s", 191 MII_OUI(ma->mii_id1, ma->mii_id2), MII_MODEL(ma->mii_id2), 192 MII_REV(ma->mii_id2), pnp); 193 194 aprint_normal(" phy %d", ma->mii_phyno); 195 return UNCONF; 196 } 197 198 static inline int 199 phy_service(struct mii_softc *sc, struct mii_data *mii, int cmd) 200 { 201 202 if (!device_is_active(sc->mii_dev)) 203 return ENXIO; 204 return PHY_SERVICE(sc, mii, cmd); 205 } 206 207 int 208 mii_ifmedia_change(struct mii_data *mii) 209 { 210 return ifmedia_change(&mii->mii_media, mii->mii_ifp); 211 } 212 213 /* 214 * Media changed; notify all PHYs. 215 */ 216 int 217 mii_mediachg(struct mii_data *mii) 218 { 219 struct mii_softc *child; 220 int rv; 221 222 mii->mii_media_status = 0; 223 mii->mii_media_active = IFM_NONE; 224 225 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 226 rv = phy_service(child, mii, MII_MEDIACHG); 227 if (rv) 228 return rv; 229 } 230 return 0; 231 } 232 233 /* 234 * Call the PHY tick routines, used during autonegotiation. 235 */ 236 void 237 mii_tick(struct mii_data *mii) 238 { 239 struct mii_softc *child; 240 241 LIST_FOREACH(child, &mii->mii_phys, mii_list) 242 (void)phy_service(child, mii, MII_TICK); 243 } 244 245 /* 246 * Get media status from PHYs. 247 */ 248 void 249 mii_pollstat(struct mii_data *mii) 250 { 251 struct mii_softc *child; 252 253 mii->mii_media_status = 0; 254 mii->mii_media_active = IFM_NONE; 255 256 LIST_FOREACH(child, &mii->mii_phys, mii_list) 257 (void)phy_service(child, mii, MII_POLLSTAT); 258 } 259 260 /* 261 * Inform the PHYs that the interface is down. 262 */ 263 void 264 mii_down(struct mii_data *mii) 265 { 266 struct mii_softc *child; 267 268 LIST_FOREACH(child, &mii->mii_phys, mii_list) 269 (void)phy_service(child, mii, MII_DOWN); 270 } 271 272 static unsigned char 273 bitreverse(unsigned char x) 274 { 275 static const unsigned char nibbletab[16] = { 276 0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15 277 }; 278 279 return ((nibbletab[x & 15] << 4) | nibbletab[x >> 4]); 280 } 281 282 u_int 283 mii_oui(uint16_t id1, uint16_t id2) 284 { 285 u_int h; 286 287 h = (id1 << 6) | (id2 >> 10); 288 289 return ((bitreverse(h >> 16) << 16) | 290 (bitreverse((h >> 8) & 255) << 8) | 291 bitreverse(h & 255)); 292 } 293