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 SMSC LAN8710A
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	smscphy_probe(device_t);
53static int	smscphy_attach(device_t);
54
55static int	smscphy_service(struct mii_softc *, struct mii_data *, int);
56static void	smscphy_auto(struct mii_softc *, int);
57static void	smscphy_status(struct mii_softc *);
58
59static device_method_t smscphy_methods[] = {
60	/* device interface */
61	DEVMETHOD(device_probe,		smscphy_probe),
62	DEVMETHOD(device_attach,	smscphy_attach),
63	DEVMETHOD(device_detach,	mii_phy_detach),
64	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
65	DEVMETHOD_END
66};
67
68static devclass_t smscphy_devclass;
69
70static driver_t smscphy_driver = {
71	"smscphy",
72	smscphy_methods,
73	sizeof(struct mii_softc)
74};
75
76DRIVER_MODULE(smscphy, miibus, smscphy_driver, smscphy_devclass, 0, 0);
77
78static const struct mii_phydesc smscphys[] = {
79	MII_PHY_DESC(SMC, LAN8710A),
80	MII_PHY_END
81};
82
83static const struct mii_phy_funcs smscphy_funcs = {
84	smscphy_service,
85	smscphy_status,
86	mii_phy_reset
87};
88
89static int
90smscphy_probe(device_t dev)
91{
92
93	return (mii_phy_dev_probe(dev, smscphys, BUS_PROBE_DEFAULT));
94}
95
96static int
97smscphy_attach(device_t dev)
98{
99	struct mii_softc *sc;
100	const struct mii_phy_funcs *mpf;
101
102	sc = device_get_softc(dev);
103	mpf = &smscphy_funcs;
104	mii_phy_dev_attach(dev, MIIF_NOISOLATE | MIIF_NOMANPAUSE, mpf, 1);
105	mii_phy_setmedia(sc);
106
107	return (0);
108}
109
110static int
111smscphy_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			smscphy_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		smscphy_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
180static void
181smscphy_auto(struct mii_softc *sc, int media)
182{
183	uint16_t	anar;
184
185	anar = BMSR_MEDIA_TO_ANAR(sc->mii_capabilities) | ANAR_CSMA;
186	if ((media & IFM_FLOW) != 0 || (sc->mii_flags & MIIF_FORCEPAUSE) != 0)
187		anar |= ANAR_FC;
188	PHY_WRITE(sc, MII_ANAR, anar);
189	/* Apparently this helps. */
190	anar = PHY_READ(sc, MII_ANAR);
191	PHY_WRITE(sc, MII_BMCR, BMCR_AUTOEN | BMCR_STARTNEG);
192}
193
194static void
195smscphy_status(struct mii_softc *sc)
196{
197	struct mii_data *mii;
198	uint32_t bmcr, bmsr, status;
199
200	mii = sc->mii_pdata;
201	mii->mii_media_status = IFM_AVALID;
202	mii->mii_media_active = IFM_ETHER;
203
204	bmsr = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
205	if ((bmsr & BMSR_LINK) != 0)
206		mii->mii_media_status |= IFM_ACTIVE;
207
208	bmcr = PHY_READ(sc, MII_BMCR);
209	if ((bmcr & BMCR_ISO) != 0) {
210		mii->mii_media_active |= IFM_NONE;
211		mii->mii_media_status = 0;
212		return;
213	}
214
215	if ((bmcr & BMCR_LOOP) != 0)
216		mii->mii_media_active |= IFM_LOOP;
217
218	if ((bmcr & BMCR_AUTOEN) != 0) {
219		if ((bmsr & BMSR_ACOMP) == 0) {
220			/* Erg, still trying, I guess... */
221			mii->mii_media_active |= IFM_NONE;
222			return;
223		}
224	}
225
226	status = PHY_READ(sc, 0x1F);
227	if (status & 0x0008)
228		mii->mii_media_active |= IFM_100_TX;
229	else
230		mii->mii_media_active |= IFM_10_T;
231	if (status & 0x0010)
232		mii->mii_media_active |= IFM_FDX | mii_phy_flowstatus(sc);
233	else
234		mii->mii_media_active |= IFM_HDX;
235}
236