1/* $NetBSD: amhphy.c,v 1.20 2014/06/16 16:48:16 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 the 10BASE-T portion of the AMD Am79c901 PHY.
40 */
41
42#include <sys/cdefs.h>
43__KERNEL_RCSID(0, "$NetBSD: amhphy.c,v 1.20 2014/06/16 16:48:16 msaitoh 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
61static int amhphymatch(device_t, cfdata_t, void *);
62static void amhphyattach(device_t, device_t, void *);
63
64CFATTACH_DECL_NEW(amhphy, sizeof(struct mii_softc),
65 amhphymatch, amhphyattach, mii_phy_detach, mii_phy_activate);
66
67static int amhphy_service(struct mii_softc *, struct mii_data *, int);
68static void amhphy_status(struct mii_softc *);
69
70static const struct mii_phy_funcs amhphy_funcs = {
71 amhphy_service, amhphy_status, mii_phy_reset,
72};
73
74static const struct mii_phydesc amhphys[] = {
75 { MII_OUI_yyAMD, MII_MODEL_yyAMD_79c901,
76 MII_STR_yyAMD_79c901 },
77
78 { 0, 0,
79 NULL },
80};
81
82static int
83amhphymatch(device_t parent, cfdata_t match, void *aux)
84{
85 struct mii_attach_args *ma = aux;
86
87 if (mii_phy_match(ma, amhphys) != NULL)
88 return (10);
89
90 return (0);
91}
92
93static void
94amhphyattach(device_t parent, device_t self, void *aux)
95{
96 struct mii_softc *sc = device_private(self);
97 struct mii_attach_args *ma = aux;
98 struct mii_data *mii = ma->mii_data;
99 const struct mii_phydesc *mpd;
100
101 mpd = mii_phy_match(ma, amhphys);
102 aprint_naive(": Media interface\n");
103 aprint_normal(": %s, rev. %d\n", mpd->mpd_name, MII_REV(ma->mii_id2));
104
105 sc->mii_dev = self;
106 sc->mii_inst = mii->mii_instance;
107 sc->mii_phy = ma->mii_phyno;
108 sc->mii_funcs = &amhphy_funcs;
109 sc->mii_pdata = mii;
110 sc->mii_flags = ma->mii_flags;
111 sc->mii_anegticks = MII_ANEGTICKS;
112
113 PHY_RESET(sc);
114
115 sc->mii_capabilities =
116 PHY_READ(sc, MII_BMSR) & ma->mii_capmask;
117 aprint_normal_dev(self, "");
118 if ((sc->mii_capabilities & BMSR_MEDIAMASK) == 0)
119 aprint_error("no media present");
120 else
121 mii_phy_add_media(sc);
122 aprint_normal("\n");
123}
124
125static int
126amhphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
127{
128 struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
129 int reg;
130
131 switch (cmd) {
132 case MII_POLLSTAT:
133 /*
134 * If we're not polling our PHY instance, just return.
135 */
136 if (IFM_INST(ife->ifm_media) != sc->mii_inst)
137 return (0);
138 break;
139
140 case MII_MEDIACHG:
141 /*
142 * If the media indicates a different PHY instance,
143 * isolate ourselves.
144 */
145 if (IFM_INST(ife->ifm_media) != sc->mii_inst) {
146 reg = PHY_READ(sc, MII_BMCR);
147 PHY_WRITE(sc, MII_BMCR, reg | BMCR_ISO);
148 return (0);
149 }
150
151 /*
152 * If the interface is not up, don't do anything.
153 */
154 if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
155 break;
156
157 mii_phy_setmedia(sc);
158 break;
159
160 case MII_TICK:
161 /*
162 * If we're not currently selected, just return.
163 */
164 if (IFM_INST(ife->ifm_media) != sc->mii_inst)
165 return (0);
166
167 if (mii_phy_tick(sc) == EJUSTRETURN)
168 return (0);
169 break;
170
171 case MII_DOWN:
172 mii_phy_down(sc);
173 return (0);
174 }
175
176 /* Update the media status. */
177 mii_phy_status(sc);
178
179 /* Callback if something changed. */
180 mii_phy_update(sc, cmd);
181 return (0);
182}
183
184static void
185amhphy_status(struct mii_softc *sc)
186{
187 struct mii_data *mii = sc->mii_pdata;
188 struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
189 int bmsr, bmcr, ssr;
190
191 mii->mii_media_status = IFM_AVALID;
192 mii->mii_media_active = IFM_ETHER;
193
194 bmsr = PHY_READ(sc, MII_BMSR);
195 ssr = PHY_READ(sc, MII_AMHPHY_SSR);
196
197 if (ssr & SSR_LS)
198 mii->mii_media_status |= IFM_ACTIVE;
199
200 bmcr = PHY_READ(sc, MII_BMCR);
201 if (bmcr & BMCR_ISO) {
202 mii->mii_media_active |= IFM_NONE;
203 mii->mii_media_status = 0;
204 return;
205 }
206
207 if (bmcr & BMCR_LOOP)
208 mii->mii_media_active |= IFM_LOOP;
209
210 if (bmcr & BMCR_AUTOEN) {
211 /*
212 * The media status bits are only valid of autonegotiation
213 * has completed (or it's disabled).
214 */
215 if ((bmsr & BMSR_ACOMP) == 0) {
216 /* Erg, still trying, I guess... */
217 mii->mii_media_active |= IFM_NONE;
218 return;
219 }
220
221 if (ssr & SSR_S) {
222 /*
223 * This should't really ever happen, since it's
224 * a 10BASE-T only PHY. But the bit exists,
225 * according to the documentation, so we pay
226 * attention to it.
227 */
228 mii->mii_media_active |= IFM_100_TX;
229 } else
230 mii->mii_media_active |= IFM_10_T;
231 if (ssr & SSR_FD)
232 mii->mii_media_active |= IFM_FDX;
233 else
234 mii->mii_media_active |= IFM_HDX;
235 } else
236 mii->mii_media_active = ife->ifm_media;
237}
238