1 /* $NetBSD: pnaphy.c,v 1.21 2016/07/07 06:55:41 msaitoh 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 1.21 2016/07/07 06:55:41 msaitoh 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_OUI_yyAMD, MII_MODEL_yyAMD_79c901home,
81 MII_STR_yyAMD_79c901home },
82
83 { 0, 0,
84 NULL },
85 };
86
87 static int
pnaphymatch(device_t parent,cfdata_t match,void * aux)88 pnaphymatch(device_t parent, cfdata_t match, void *aux)
89 {
90 struct mii_attach_args *ma = aux;
91
92 if (mii_phy_match(ma, pnaphys) != NULL) {
93 /*
94 * Match higher than ukphy, but lower than a specific
95 * driver would match.
96 */
97 return (2);
98 }
99
100 return (0);
101 }
102
103 static void
pnaphyattach(device_t parent,device_t self,void * aux)104 pnaphyattach(device_t parent, device_t self, void *aux)
105 {
106 struct mii_softc *sc = device_private(self);
107 struct mii_attach_args *ma = aux;
108 struct mii_data *mii = ma->mii_data;
109 const struct mii_phydesc *mpd;
110
111 mpd = mii_phy_match(ma, pnaphys);
112 aprint_naive(": Media interface\n");
113 aprint_normal(": %s, rev. %d\n", mpd->mpd_name, MII_REV(ma->mii_id2));
114
115 sc->mii_dev = self;
116 sc->mii_inst = mii->mii_instance;
117 sc->mii_phy = ma->mii_phyno;
118 sc->mii_funcs = &pnaphy_funcs;
119 sc->mii_pdata = mii;
120 sc->mii_flags = ma->mii_flags | MIIF_IS_HPNA; /* force HomePNA */
121 sc->mii_anegticks = MII_ANEGTICKS;
122
123 PHY_RESET(sc);
124
125 sc->mii_capabilities = PHY_READ(sc, MII_BMSR) & ma->mii_capmask;
126 aprint_normal_dev(self, "");
127 if ((sc->mii_capabilities & BMSR_MEDIAMASK) == 0)
128 aprint_error("no media present");
129 else
130 mii_phy_add_media(sc);
131 aprint_normal("\n");
132 }
133
134 static int
pnaphy_service(struct mii_softc * sc,struct mii_data * mii,int cmd)135 pnaphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
136 {
137 struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
138 int reg;
139
140 switch (cmd) {
141 case MII_POLLSTAT:
142 /*
143 * If we're not polling our PHY instance, just return.
144 */
145 if (IFM_INST(ife->ifm_media) != sc->mii_inst)
146 return (0);
147 break;
148
149 case MII_MEDIACHG:
150 /*
151 * If the media indicates a different PHY instance,
152 * isolate ourselves.
153 */
154 if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
155 reg = PHY_READ(sc, MII_BMCR);
156 PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
157 return (0);
158 }
159
160 /*
161 * If the interface is not up, don't do anything.
162 */
163 if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
164 break;
165
166 mii_phy_setmedia(sc);
167 break;
168
169 case MII_TICK:
170 /*
171 * If we're not currently selected, just return.
172 */
173 if (IFM_INST(ife->ifm_media) != sc->mii_inst)
174 return (0);
175
176 if (mii_phy_tick(sc) == EJUSTRETURN)
177 return (0);
178 break;
179
180 case MII_DOWN:
181 mii_phy_down(sc);
182 return (0);
183 }
184
185 /* Update the media status. */
186 mii_phy_status(sc);
187
188 /* Callback if something changed. */
189 mii_phy_update(sc, cmd);
190 return (0);
191 }
192
193 static void
pnaphy_status(struct mii_softc * sc)194 pnaphy_status(struct mii_softc *sc)
195 {
196 struct mii_data *mii = sc->mii_pdata;
197 struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
198 int bmsr, bmcr;
199
200 mii->mii_media_status = IFM_AVALID;
201 mii->mii_media_active = IFM_ETHER;
202
203 bmsr = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
204
205 if (bmsr & BMSR_LINK)
206 mii->mii_media_status |= IFM_ACTIVE;
207
208 bmcr = PHY_READ(sc, MII_BMCR);
209 if (bmcr & BMCR_ISO) {
210 mii->mii_media_active |= IFM_NONE;
211 mii->mii_media_status = 0;
212 return;
213 }
214
215 if (bmcr & BMCR_LOOP)
216 mii->mii_media_active |= IFM_LOOP;
217
218 /*
219 * On HomePNA PHYs, the current media is always the selected
220 * media.
221 *
222 * XXX May not be the case w/ HomePNA 2.
223 */
224 mii->mii_media_active = ife->ifm_media;
225 }
226