1 /* $NetBSD: amhphy.c,v 1.27 2024/02/08 19:44:08 andvar 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 the 10BASE-T portion of the AMD Am79c901 PHY.
40 */
41
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: amhphy.c,v 1.27 2024/02/08 19:44:08 andvar Exp $");
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/device.h>
49 #include <sys/socket.h>
50 #include <sys/errno.h>
51
52 #include <net/if.h>
53 #include <net/if_media.h>
54
55 #include <dev/mii/mii.h>
56 #include <dev/mii/miivar.h>
57 #include <dev/mii/miidevs.h>
58
59 #include <dev/mii/amhphyreg.h>
60
61 static int amhphymatch(device_t, cfdata_t, void *);
62 static void amhphyattach(device_t, device_t, void *);
63
64 CFATTACH_DECL_NEW(amhphy, sizeof(struct mii_softc),
65 amhphymatch, amhphyattach, mii_phy_detach, mii_phy_activate);
66
67 static int amhphy_service(struct mii_softc *, struct mii_data *, int);
68 static void amhphy_status(struct mii_softc *);
69
70 static const struct mii_phy_funcs amhphy_funcs = {
71 amhphy_service, amhphy_status, mii_phy_reset,
72 };
73
74 static const struct mii_phydesc amhphys[] = {
75 MII_PHY_DESC(yyAMD, 79c901),
76 MII_PHY_END,
77 };
78
79 static int
amhphymatch(device_t parent,cfdata_t match,void * aux)80 amhphymatch(device_t parent, cfdata_t match, void *aux)
81 {
82 struct mii_attach_args *ma = aux;
83
84 if (mii_phy_match(ma, amhphys) != NULL)
85 return 10;
86
87 return 0;
88 }
89
90 static void
amhphyattach(device_t parent,device_t self,void * aux)91 amhphyattach(device_t parent, device_t self, void *aux)
92 {
93 struct mii_softc *sc = device_private(self);
94 struct mii_attach_args *ma = aux;
95 struct mii_data *mii = ma->mii_data;
96 const struct mii_phydesc *mpd;
97
98 mpd = mii_phy_match(ma, amhphys);
99 aprint_naive(": Media interface\n");
100 aprint_normal(": %s, rev. %d\n", mpd->mpd_name, MII_REV(ma->mii_id2));
101
102 sc->mii_dev = self;
103 sc->mii_inst = mii->mii_instance;
104 sc->mii_phy = ma->mii_phyno;
105 sc->mii_funcs = &amhphy_funcs;
106 sc->mii_pdata = mii;
107 sc->mii_flags = ma->mii_flags;
108
109 mii_lock(mii);
110
111 PHY_RESET(sc);
112
113 PHY_READ(sc, MII_BMSR, &sc->mii_capabilities);
114 sc->mii_capabilities &= ma->mii_capmask;
115
116 mii_unlock(mii);
117
118 mii_phy_add_media(sc);
119 }
120
121 static int
amhphy_service(struct mii_softc * sc,struct mii_data * mii,int cmd)122 amhphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
123 {
124 struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
125 uint16_t reg;
126
127 KASSERT(mii_locked(mii));
128
129 switch (cmd) {
130 case MII_POLLSTAT:
131 /* If we're not polling our PHY instance, just return. */
132 if (IFM_INST(ife->ifm_media) != sc->mii_inst)
133 return 0;
134 break;
135
136 case MII_MEDIACHG:
137 /*
138 * If the media indicates a different PHY instance,
139 * isolate ourselves.
140 */
141 if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
142 PHY_READ(sc, MII_BMCR, ®);
143 PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
144 return 0;
145 }
146
147 /* If the interface is not up, don't do anything. */
148 if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
149 break;
150
151 mii_phy_setmedia(sc);
152 break;
153
154 case MII_TICK:
155 /* If we're not currently selected, just return. */
156 if (IFM_INST(ife->ifm_media) != sc->mii_inst)
157 return 0;
158
159 if (mii_phy_tick(sc) == EJUSTRETURN)
160 return 0;
161 break;
162
163 case MII_DOWN:
164 mii_phy_down(sc);
165 return 0;
166 }
167
168 /* Update the media status. */
169 mii_phy_status(sc);
170
171 /* Callback if something changed. */
172 mii_phy_update(sc, cmd);
173 return 0;
174 }
175
176 static void
amhphy_status(struct mii_softc * sc)177 amhphy_status(struct mii_softc *sc)
178 {
179 struct mii_data *mii = sc->mii_pdata;
180 struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
181 uint16_t bmsr, bmcr, ssr;
182
183 KASSERT(mii_locked(mii));
184
185 mii->mii_media_status = IFM_AVALID;
186 mii->mii_media_active = IFM_ETHER;
187
188 PHY_READ(sc, MII_BMSR, &bmsr);
189 PHY_READ(sc, MII_AMHPHY_SSR, &ssr);
190
191 if (ssr & SSR_LS)
192 mii->mii_media_status |= IFM_ACTIVE;
193
194 PHY_READ(sc, MII_BMCR, &bmcr);
195 if (bmcr & BMCR_ISO) {
196 mii->mii_media_active |= IFM_NONE;
197 mii->mii_media_status = 0;
198 return;
199 }
200
201 if (bmcr & BMCR_LOOP)
202 mii->mii_media_active |= IFM_LOOP;
203
204 if (bmcr & BMCR_AUTOEN) {
205 /*
206 * The media status bits are only valid if autonegotiation
207 * has completed (or it's disabled).
208 */
209 if ((bmsr & BMSR_ACOMP) == 0) {
210 /* Erg, still trying, I guess... */
211 mii->mii_media_active |= IFM_NONE;
212 return;
213 }
214
215 if (ssr & SSR_S) {
216 /*
217 * This shouldn't really ever happen, since it's
218 * a 10BASE-T only PHY. But the bit exists, according
219 * to the documentation, so we pay attention to it.
220 */
221 mii->mii_media_active |= IFM_100_TX;
222 } else
223 mii->mii_media_active |= IFM_10_T;
224 if (ssr & SSR_FD)
225 mii->mii_media_active |= IFM_FDX;
226 else
227 mii->mii_media_active |= IFM_HDX;
228 } else
229 mii->mii_media_active = ife->ifm_media;
230 }
231