1/*-
2 * Copyright (c) 2006 Benno Rice. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include <sys/cdefs.h>
26__FBSDID("$FreeBSD: head/sys/dev/mii/smcphy.c 214262 2010-10-24 11:37:01Z marius $");
27
28/*
29 * Driver for the internal PHY on the SMSC LAN91C111.
30 */
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/kernel.h>
35#include <sys/socket.h>
36#include <sys/errno.h>
37#include <sys/module.h>
38#include <sys/bus.h>
39#include <sys/malloc.h>
40
41#include <machine/bus.h>
42
43#include <net/if.h>
44#include <net/if_media.h>
45
46#include <dev/mii/mii.h>
47#include <dev/mii/miivar.h>
48#include "miidevs.h"
49
50#include "miibus_if.h"
51
52static int smcphy_probe(device_t);
53static int smcphy_attach(device_t);
54
55static int smcphy_service(struct mii_softc *, struct mii_data *, int);
56static int smcphy_reset(struct mii_softc *);
57static void smcphy_auto(struct mii_softc *);
58
59static device_method_t smcphy_methods[] = {
60 /* device interface */
61 DEVMETHOD(device_probe, smcphy_probe),
62 DEVMETHOD(device_attach, smcphy_attach),
63 DEVMETHOD(device_detach, mii_phy_detach),
64 DEVMETHOD(device_shutdown, bus_generic_shutdown),
65
66 { 0, 0 }
67};
68
69static devclass_t smcphy_devclass;
70
71static driver_t smcphy_driver = {
72 "smcphy",
73 smcphy_methods,
74 sizeof(struct mii_softc)
75};
76
77DRIVER_MODULE(smcphy, miibus, smcphy_driver, smcphy_devclass, 0, 0);
78
79static const struct mii_phydesc smcphys[] = {
80 MII_PHY_DESC(SMSC, LAN83C183),
81 MII_PHY_END
82};
83
84static int
85smcphy_probe(device_t dev)
86{
87
88 return (mii_phy_dev_probe(dev, smcphys, BUS_PROBE_DEFAULT));
89}
90
91static int
92smcphy_attach(device_t dev)
93{
94 struct mii_softc *sc;
95 struct mii_attach_args *ma;
96 struct mii_data *mii;
97
98 sc = device_get_softc(dev);
99 ma = device_get_ivars(dev);
100 sc->mii_dev = device_get_parent(dev);
101 mii = ma->mii_data;
102 LIST_INSERT_HEAD(&mii->mii_phys, sc, mii_list);
103
104 sc->mii_flags = miibus_get_flags(dev);
105 sc->mii_inst = mii->mii_instance++;
106 sc->mii_phy = ma->mii_phyno;
107 sc->mii_service = smcphy_service;
108 sc->mii_pdata = mii;
109
110 sc->mii_flags |= MIIF_NOISOLATE | MIIF_NOLOOP;
111
112 if (smcphy_reset(sc) != 0) {
113 device_printf(dev, "reset failed\n");
114 }
115
116 /* Mask interrupts, we poll instead. */
117 PHY_WRITE(sc, 0x1e, 0xffc0);
118
119 sc->mii_capabilities = PHY_READ(sc, MII_BMSR) & ma->mii_capmask;
120 device_printf(dev, " ");
121 mii_phy_add_media(sc);
122 printf("\n");
123
124 MIIBUS_MEDIAINIT(sc->mii_dev);
125 mii_phy_setmedia(sc);
126
127 return (0);
128}
129
130static int
131smcphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
132{
133 struct ifmedia_entry *ife;
134 int reg;
135
136 ife = mii->mii_media.ifm_cur;
137
138 switch (cmd) {
139 case MII_POLLSTAT:
140 break;
141
142 case MII_MEDIACHG:
143 /*
144 * If the interface is not up, don't do anything.
145 */
146 if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
147 break;
148
149 switch (IFM_SUBTYPE(ife->ifm_media)) {
150 case IFM_AUTO:
151 smcphy_auto(sc);
152 break;
153
154 default:
155 mii_phy_setmedia(sc);
156 break;
157 }
158
159 break;
160
161 case MII_TICK:
162 if ((mii->mii_ifp->if_flags & IFF_UP) == 0) {
163 return (0);
164 }
165
166 if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
167 break;
168 }
169
170 /* I have no idea why BMCR_ISO gets set. */
171 reg = PHY_READ(sc, MII_BMCR);
172 if (reg & BMCR_ISO) {
173 PHY_WRITE(sc, MII_BMCR, reg & ~BMCR_ISO);
174 }
175
176 reg = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
177 if (reg & BMSR_LINK) {
178 sc->mii_ticks = 0;
179 break;
180 }
181
182 if (++sc->mii_ticks <= MII_ANEGTICKS) {
183 break;
184 }
185
186 sc->mii_ticks = 0;
187 if (smcphy_reset(sc) != 0) {
188 device_printf(sc->mii_dev, "reset failed\n");
189 }
190 smcphy_auto(sc);
191 break;
192 }
193
194 /* Update the media status. */
195 ukphy_status(sc);
196
197 /* Callback if something changed. */
198 mii_phy_update(sc, cmd);
199 return (0);
200}
201
202static int
203smcphy_reset(struct mii_softc *sc)
204{
205 u_int bmcr;
206 int timeout;
207
208 PHY_WRITE(sc, MII_BMCR, BMCR_RESET);
209
210 for (timeout = 2; timeout > 0; timeout--) {
211 DELAY(50000);
212 bmcr = PHY_READ(sc, MII_BMCR);
213 if ((bmcr & BMCR_RESET) == 0)
214 break;
215 }
216
217 if (bmcr & BMCR_RESET) {
218 return (EIO);
219 }
220
221 PHY_WRITE(sc, MII_BMCR, 0x3000);
222 return (0);
223}
224
225static void
226smcphy_auto(struct mii_softc *sc)
227{
228 uint16_t anar;
229
230 anar = BMSR_MEDIA_TO_ANAR(sc->mii_capabilities) |
231 ANAR_CSMA;
232 if (sc->mii_flags & MIIF_DOPAUSE)
233 anar |= ANAR_FC;
234 PHY_WRITE(sc, MII_ANAR, anar);
235 /* Apparently this helps. */
236 anar = PHY_READ(sc, MII_ANAR);
237 PHY_WRITE(sc, MII_BMCR, BMCR_AUTOEN | BMCR_STARTNEG);
238}