xref: /freebsd/sys/dev/mii/smcphy.c (revision bb15ca603fa442c72dde3f3cb8b46db6970e3950)
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("$FreeBSD$");
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 
52 static int	smcphy_probe(device_t);
53 static int	smcphy_attach(device_t);
54 
55 static int	smcphy_service(struct mii_softc *, struct mii_data *, int);
56 static void	smcphy_reset(struct mii_softc *);
57 static void	smcphy_auto(struct mii_softc *, int);
58 
59 static 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 	DEVMETHOD_END
66 };
67 
68 static devclass_t smcphy_devclass;
69 
70 static driver_t smcphy_driver = {
71 	"smcphy",
72 	smcphy_methods,
73 	sizeof(struct mii_softc)
74 };
75 
76 DRIVER_MODULE(smcphy, miibus, smcphy_driver, smcphy_devclass, 0, 0);
77 
78 static const struct mii_phydesc smcphys[] = {
79 	MII_PHY_DESC(SEEQ, 84220),
80 	MII_PHY_END
81 };
82 
83 static const struct mii_phy_funcs smcphy_funcs = {
84 	smcphy_service,
85 	ukphy_status,
86 	smcphy_reset
87 };
88 
89 static int
90 smcphy_probe(device_t dev)
91 {
92 
93 	return (mii_phy_dev_probe(dev, smcphys, BUS_PROBE_DEFAULT));
94 }
95 
96 static int
97 smcphy_attach(device_t dev)
98 {
99 	struct mii_softc *sc;
100 
101 	sc = device_get_softc(dev);
102 
103 	mii_phy_dev_attach(dev, MIIF_NOISOLATE | MIIF_NOMANPAUSE,
104 	    &smcphy_funcs, 1);
105 	mii_phy_setmedia(sc);
106 
107 	return (0);
108 }
109 
110 static int
111 smcphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
112 {
113         struct	ifmedia_entry *ife;
114         int	reg;
115 
116 	ife = mii->mii_media.ifm_cur;
117 
118         switch (cmd) {
119         case MII_POLLSTAT:
120                 break;
121 
122         case MII_MEDIACHG:
123                 /*
124                  * If the interface is not up, don't do anything.
125                  */
126                 if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
127                         break;
128 
129 		switch (IFM_SUBTYPE(ife->ifm_media)) {
130 		case IFM_AUTO:
131 			smcphy_auto(sc, ife->ifm_media);
132 			break;
133 
134 		default:
135                 	mii_phy_setmedia(sc);
136 			break;
137 		}
138 
139                 break;
140 
141         case MII_TICK:
142 		if ((mii->mii_ifp->if_flags & IFF_UP) == 0) {
143 			return (0);
144 		}
145 
146 		if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
147 			break;
148 		}
149 
150 		/* I have no idea why BMCR_ISO gets set. */
151 		reg = PHY_READ(sc, MII_BMCR);
152 		if (reg & BMCR_ISO) {
153 			PHY_WRITE(sc, MII_BMCR, reg & ~BMCR_ISO);
154 		}
155 
156 		reg = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
157 		if (reg & BMSR_LINK) {
158 			sc->mii_ticks = 0;
159 			break;
160 		}
161 
162 		if (++sc->mii_ticks <= MII_ANEGTICKS) {
163 			break;
164 		}
165 
166 		sc->mii_ticks = 0;
167 		PHY_RESET(sc);
168 		smcphy_auto(sc, ife->ifm_media);
169                 break;
170         }
171 
172         /* Update the media status. */
173         PHY_STATUS(sc);
174 
175         /* Callback if something changed. */
176         mii_phy_update(sc, cmd);
177         return (0);
178 }
179 
180 static void
181 smcphy_reset(struct mii_softc *sc)
182 {
183 	u_int	bmcr;
184 	int	timeout;
185 
186 	PHY_WRITE(sc, MII_BMCR, BMCR_RESET);
187 
188 	for (timeout = 2; timeout > 0; timeout--) {
189 		DELAY(50000);
190 		bmcr = PHY_READ(sc, MII_BMCR);
191 		if ((bmcr & BMCR_RESET) == 0)
192 			break;
193 	}
194 
195 	if (bmcr & BMCR_RESET)
196 		device_printf(sc->mii_dev, "reset failed\n");
197 
198 	PHY_WRITE(sc, MII_BMCR, 0x3000);
199 
200 	/* Mask interrupts, we poll instead. */
201 	PHY_WRITE(sc, 0x1e, 0xffc0);
202 }
203 
204 static void
205 smcphy_auto(struct mii_softc *sc, int media)
206 {
207 	uint16_t	anar;
208 
209 	anar = BMSR_MEDIA_TO_ANAR(sc->mii_capabilities) | ANAR_CSMA;
210 	if ((media & IFM_FLOW) != 0 || (sc->mii_flags & MIIF_FORCEPAUSE) != 0)
211 		anar |= ANAR_FC;
212 	PHY_WRITE(sc, MII_ANAR, anar);
213 	/* Apparently this helps. */
214 	anar = PHY_READ(sc, MII_ANAR);
215 	PHY_WRITE(sc, MII_BMCR, BMCR_AUTOEN | BMCR_STARTNEG);
216 }
217