1 /* $NetBSD: mii.c,v 1.50 2009/12/04 22:37:35 dyoung 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 1.50 2009/12/04 22:37:35 dyoung 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 bmsr, offset = 0; 67 int phymin, phymax; 68 int locs[MIICF_NLOCS]; 69 70 if (phyloc != MII_PHY_ANY && offloc != MII_OFFSET_ANY) 71 panic("mii_attach: phyloc and offloc specified"); 72 73 if (phyloc == MII_PHY_ANY) { 74 phymin = 0; 75 phymax = MII_NPHY - 1; 76 } else 77 phymin = phymax = phyloc; 78 79 if ((mii->mii_flags & MIIF_INITDONE) == 0) { 80 LIST_INIT(&mii->mii_phys); 81 mii->mii_flags |= MIIF_INITDONE; 82 } 83 84 for (ma.mii_phyno = phymin; ma.mii_phyno <= phymax; ma.mii_phyno++) { 85 /* 86 * Make sure we haven't already configured a PHY at this 87 * address. This allows mii_attach() to be called 88 * multiple times. 89 */ 90 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 91 if (child->mii_phy == ma.mii_phyno) { 92 /* 93 * Yes, there is already something 94 * configured at this address. 95 */ 96 offset++; 97 continue; 98 } 99 } 100 101 /* 102 * Check to see if there is a PHY at this address. Note, 103 * many braindead PHYs report 0/0 in their ID registers, 104 * so we test for media in the BMSR. 105 */ 106 bmsr = (*mii->mii_readreg)(parent, ma.mii_phyno, MII_BMSR); 107 if (bmsr == 0 || bmsr == 0xffff || 108 (bmsr & (BMSR_EXTSTAT|BMSR_MEDIAMASK)) == 0) { 109 /* Assume no PHY at this address. */ 110 continue; 111 } 112 113 /* 114 * There is a PHY at this address. If we were given an 115 * `offset' locator, skip this PHY if it doesn't match. 116 */ 117 if (offloc != MII_OFFSET_ANY && offloc != offset) { 118 offset++; 119 continue; 120 } 121 122 /* 123 * Extract the IDs. Braindead PHYs will be handled by 124 * the `ukphy' driver, as we have no ID information to 125 * match on. 126 */ 127 ma.mii_id1 = (*mii->mii_readreg)(parent, ma.mii_phyno, 128 MII_PHYIDR1); 129 ma.mii_id2 = (*mii->mii_readreg)(parent, ma.mii_phyno, 130 MII_PHYIDR2); 131 132 ma.mii_data = mii; 133 ma.mii_capmask = capmask; 134 ma.mii_flags = flags | (mii->mii_flags & MIIF_INHERIT_MASK); 135 136 locs[MIICF_PHY] = ma.mii_phyno; 137 138 child = device_private(config_found_sm_loc(parent, "mii", 139 locs, &ma, mii_print, config_stdsubmatch)); 140 if (child) { 141 /* 142 * Link it up in the parent's MII data. 143 */ 144 callout_init(&child->mii_nway_ch, 0); 145 LIST_INSERT_HEAD(&mii->mii_phys, child, mii_list); 146 child->mii_offset = offset; 147 mii->mii_instance++; 148 } 149 offset++; 150 } 151 } 152 153 void 154 mii_detach(struct mii_data *mii, int phyloc, int offloc) 155 { 156 struct mii_softc *child, *nchild; 157 158 if (phyloc != MII_PHY_ANY && offloc != MII_PHY_ANY) 159 panic("mii_detach: phyloc and offloc specified"); 160 161 if ((mii->mii_flags & MIIF_INITDONE) == 0) 162 return; 163 164 for (child = LIST_FIRST(&mii->mii_phys); 165 child != NULL; child = nchild) { 166 nchild = LIST_NEXT(child, mii_list); 167 if (phyloc != MII_PHY_ANY || offloc != MII_OFFSET_ANY) { 168 if (phyloc != MII_PHY_ANY && 169 phyloc != child->mii_phy) 170 continue; 171 if (offloc != MII_OFFSET_ANY && 172 offloc != child->mii_offset) 173 continue; 174 } 175 (void)config_detach(child->mii_dev, DETACH_FORCE); 176 } 177 } 178 179 static int 180 mii_print(void *aux, const char *pnp) 181 { 182 struct mii_attach_args *ma = aux; 183 184 if (pnp != NULL) 185 aprint_normal("OUI 0x%06x model 0x%04x rev %d at %s", 186 MII_OUI(ma->mii_id1, ma->mii_id2), MII_MODEL(ma->mii_id2), 187 MII_REV(ma->mii_id2), pnp); 188 189 aprint_normal(" phy %d", ma->mii_phyno); 190 return (UNCONF); 191 } 192 193 static inline int 194 phy_service(struct mii_softc *sc, struct mii_data *mii, int cmd) 195 { 196 if (!device_is_active(sc->mii_dev)) 197 return ENXIO; 198 return PHY_SERVICE(sc, mii, cmd); 199 } 200 201 int 202 mii_ifmedia_change(struct mii_data *mii) 203 { 204 return ifmedia_change(&mii->mii_media, mii->mii_ifp); 205 } 206 207 /* 208 * Media changed; notify all PHYs. 209 */ 210 int 211 mii_mediachg(struct mii_data *mii) 212 { 213 struct mii_softc *child; 214 int rv; 215 216 mii->mii_media_status = 0; 217 mii->mii_media_active = IFM_NONE; 218 219 LIST_FOREACH(child, &mii->mii_phys, mii_list) { 220 rv = phy_service(child, mii, MII_MEDIACHG); 221 if (rv) 222 return (rv); 223 } 224 return (0); 225 } 226 227 /* 228 * Call the PHY tick routines, used during autonegotiation. 229 */ 230 void 231 mii_tick(struct mii_data *mii) 232 { 233 struct mii_softc *child; 234 235 LIST_FOREACH(child, &mii->mii_phys, mii_list) 236 (void)phy_service(child, mii, MII_TICK); 237 } 238 239 /* 240 * Get media status from PHYs. 241 */ 242 void 243 mii_pollstat(struct mii_data *mii) 244 { 245 struct mii_softc *child; 246 247 mii->mii_media_status = 0; 248 mii->mii_media_active = IFM_NONE; 249 250 LIST_FOREACH(child, &mii->mii_phys, mii_list) 251 (void)phy_service(child, mii, MII_POLLSTAT); 252 } 253 254 /* 255 * Inform the PHYs that the interface is down. 256 */ 257 void 258 mii_down(struct mii_data *mii) 259 { 260 struct mii_softc *child; 261 262 LIST_FOREACH(child, &mii->mii_phys, mii_list) 263 (void)phy_service(child, mii, MII_DOWN); 264 } 265 266 static unsigned char 267 bitreverse(unsigned char x) 268 { 269 static unsigned char nibbletab[16] = { 270 0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15 271 }; 272 273 return ((nibbletab[x & 15] << 4) | nibbletab[x >> 4]); 274 } 275 276 u_int 277 mii_oui(u_int id1, u_int id2) 278 { 279 u_int h; 280 281 h = (id1 << 6) | (id2 >> 10); 282 283 return ((bitreverse(h >> 16) << 16) | 284 (bitreverse((h >> 8) & 255) << 8) | 285 bitreverse(h & 255)); 286 } 287