1 /* $NetBSD: pnaphy.c,v 1.26 2020/03/15 23:04:50 thorpej Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Driver for generic HomePNA 1.0 PHYs. 40 * 41 * HomePNA 1.0 PHYs are pretty simple -- they support exactly one 42 * media type, and don't do autonegotiation. 43 * 44 * HomePNA PHYs often have vendor-specific registers for tuning 45 * the network connection, but we don't deal with any of that 46 * at all. 47 */ 48 49 #include <sys/cdefs.h> 50 __KERNEL_RCSID(0, "$NetBSD: pnaphy.c,v 1.26 2020/03/15 23:04:50 thorpej Exp $"); 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/kernel.h> 55 #include <sys/device.h> 56 #include <sys/socket.h> 57 #include <sys/errno.h> 58 59 #include <net/if.h> 60 #include <net/if_media.h> 61 62 #include <dev/mii/mii.h> 63 #include <dev/mii/miivar.h> 64 #include <dev/mii/miidevs.h> 65 66 static int pnaphymatch(device_t, cfdata_t, void *); 67 static void pnaphyattach(device_t, device_t, void *); 68 69 CFATTACH_DECL_NEW(pnaphy, sizeof(struct mii_softc), 70 pnaphymatch, pnaphyattach, mii_phy_detach, mii_phy_activate); 71 72 static int pnaphy_service(struct mii_softc *, struct mii_data *, int); 73 static void pnaphy_status(struct mii_softc *); 74 75 static const struct mii_phy_funcs pnaphy_funcs = { 76 pnaphy_service, pnaphy_status, mii_phy_reset, 77 }; 78 79 static const struct mii_phydesc pnaphys[] = { 80 MII_PHY_DESC(yyAMD, 79c901home), 81 MII_PHY_END, 82 }; 83 84 static int 85 pnaphymatch(device_t parent, cfdata_t match, void *aux) 86 { 87 struct mii_attach_args *ma = aux; 88 89 if (mii_phy_match(ma, pnaphys) != NULL) { 90 /* 91 * Match higher than ukphy, but lower than a specific 92 * driver would match. 93 */ 94 return 2; 95 } 96 97 return 0; 98 } 99 100 static void 101 pnaphyattach(device_t parent, device_t self, void *aux) 102 { 103 struct mii_softc *sc = device_private(self); 104 struct mii_attach_args *ma = aux; 105 struct mii_data *mii = ma->mii_data; 106 const struct mii_phydesc *mpd; 107 108 mpd = mii_phy_match(ma, pnaphys); 109 aprint_naive(": Media interface\n"); 110 aprint_normal(": %s, rev. %d\n", mpd->mpd_name, MII_REV(ma->mii_id2)); 111 112 sc->mii_dev = self; 113 sc->mii_inst = mii->mii_instance; 114 sc->mii_phy = ma->mii_phyno; 115 sc->mii_funcs = &pnaphy_funcs; 116 sc->mii_pdata = mii; 117 sc->mii_flags = ma->mii_flags | MIIF_IS_HPNA; /* Force HomePNA */ 118 119 mii_lock(mii); 120 121 PHY_RESET(sc); 122 123 PHY_READ(sc, MII_BMSR, &sc->mii_capabilities); 124 sc->mii_capabilities &= ma->mii_capmask; 125 126 mii_unlock(mii); 127 128 mii_phy_add_media(sc); 129 } 130 131 static int 132 pnaphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd) 133 { 134 struct ifmedia_entry *ife = mii->mii_media.ifm_cur; 135 uint16_t reg; 136 137 KASSERT(mii_locked(mii)); 138 139 switch (cmd) { 140 case MII_POLLSTAT: 141 /* If we're not polling our PHY instance, just return. */ 142 if (IFM_INST(ife->ifm_media) != sc->mii_inst) 143 return 0; 144 break; 145 146 case MII_MEDIACHG: 147 /* 148 * If the media indicates a different PHY instance, 149 * isolate ourselves. 150 */ 151 if (IFM_INST(ife->ifm_media) != sc->mii_inst) { 152 PHY_READ(sc, MII_BMCR, ®); 153 PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO); 154 return 0; 155 } 156 157 /* If the interface is not up, don't do anything. */ 158 if ((mii->mii_ifp->if_flags & IFF_UP) == 0) 159 break; 160 161 mii_phy_setmedia(sc); 162 break; 163 164 case MII_TICK: 165 /* If we're not currently selected, just return. */ 166 if (IFM_INST(ife->ifm_media) != sc->mii_inst) 167 return 0; 168 169 if (mii_phy_tick(sc) == EJUSTRETURN) 170 return 0; 171 break; 172 173 case MII_DOWN: 174 mii_phy_down(sc); 175 return 0; 176 } 177 178 /* Update the media status. */ 179 mii_phy_status(sc); 180 181 /* Callback if something changed. */ 182 mii_phy_update(sc, cmd); 183 return 0; 184 } 185 186 static void 187 pnaphy_status(struct mii_softc *sc) 188 { 189 struct mii_data *mii = sc->mii_pdata; 190 struct ifmedia_entry *ife = mii->mii_media.ifm_cur; 191 uint16_t bmsr, bmcr; 192 193 KASSERT(mii_locked(mii)); 194 195 mii->mii_media_status = IFM_AVALID; 196 mii->mii_media_active = IFM_ETHER; 197 198 PHY_READ(sc, MII_BMSR, &bmsr); 199 PHY_READ(sc, MII_BMSR, &bmsr); 200 201 if (bmsr & BMSR_LINK) 202 mii->mii_media_status |= IFM_ACTIVE; 203 204 PHY_READ(sc, MII_BMCR, &bmcr); 205 if (bmcr & BMCR_ISO) { 206 mii->mii_media_active |= IFM_NONE; 207 mii->mii_media_status = 0; 208 return; 209 } 210 211 if (bmcr & BMCR_LOOP) 212 mii->mii_media_active |= IFM_LOOP; 213 214 /* 215 * On HomePNA PHYs, the current media is always the selected 216 * media. 217 * 218 * XXX May not be the case w/ HomePNA 2. 219 */ 220 mii->mii_media_active = ife->ifm_media; 221 } 222