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
pnaphymatch(device_t parent,cfdata_t match,void * aux)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
pnaphyattach(device_t parent,device_t self,void * aux)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
pnaphy_service(struct mii_softc * sc,struct mii_data * mii,int cmd)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
pnaphy_status(struct mii_softc * sc)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