| 1 | /* $NetBSD: mii.c,v 1.51 2015/06/11 05:22:55 matt 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 1.51 2015/06/11 05:22:55 matt 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 const 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 | |