1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2010, Pyun YongHyeon <yongari@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
12 * disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 /*
32 * Driver for the RDC Semiconductor R6040 10/100 PHY.
33 */
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/module.h>
39 #include <sys/socket.h>
40 #include <sys/bus.h>
41
42 #include <net/if.h>
43 #include <net/if_media.h>
44
45 #include <dev/mii/mii.h>
46 #include <dev/mii/miivar.h>
47 #include "miidevs.h"
48
49 #include <dev/mii/rdcphyreg.h>
50
51 #include "miibus_if.h"
52
53 static device_probe_t rdcphy_probe;
54 static device_attach_t rdcphy_attach;
55
56 struct rdcphy_softc {
57 struct mii_softc mii_sc;
58 int mii_link_tick;
59 #define RDCPHY_MANNEG_TICK 3
60 };
61
62 static device_method_t rdcphy_methods[] = {
63 /* device interface */
64 DEVMETHOD(device_probe, rdcphy_probe),
65 DEVMETHOD(device_attach, rdcphy_attach),
66 DEVMETHOD(device_detach, mii_phy_detach),
67 DEVMETHOD(device_shutdown, bus_generic_shutdown),
68 DEVMETHOD_END
69 };
70
71 static driver_t rdcphy_driver = {
72 "rdcphy",
73 rdcphy_methods,
74 sizeof(struct rdcphy_softc)
75 };
76
77 DRIVER_MODULE(rdcphy, miibus, rdcphy_driver, 0, 0);
78
79 static int rdcphy_service(struct mii_softc *, struct mii_data *, int);
80 static void rdcphy_status(struct mii_softc *);
81
82 static const struct mii_phydesc rdcphys[] = {
83 MII_PHY_DESC(RDC, R6040),
84 MII_PHY_DESC(RDC, R6040_2),
85 MII_PHY_END
86 };
87
88 static const struct mii_phy_funcs rdcphy_funcs = {
89 rdcphy_service,
90 rdcphy_status,
91 mii_phy_reset
92 };
93
94 static int
rdcphy_probe(device_t dev)95 rdcphy_probe(device_t dev)
96 {
97
98 return (mii_phy_dev_probe(dev, rdcphys, BUS_PROBE_DEFAULT));
99 }
100
101 static int
rdcphy_attach(device_t dev)102 rdcphy_attach(device_t dev)
103 {
104
105 mii_phy_dev_attach(dev, MIIF_NOMANPAUSE, &rdcphy_funcs, 1);
106 return (0);
107 }
108
109 static int
rdcphy_service(struct mii_softc * sc,struct mii_data * mii,int cmd)110 rdcphy_service(struct mii_softc *sc, struct mii_data *mii, int cmd)
111 {
112 struct rdcphy_softc *rsc;
113 struct ifmedia_entry *ife;
114
115 rsc = (struct rdcphy_softc *)sc;
116 ife = mii->mii_media.ifm_cur;
117
118 switch (cmd) {
119 case MII_POLLSTAT:
120 break;
121
122 case MII_MEDIACHG:
123 mii_phy_setmedia(sc);
124 switch (IFM_SUBTYPE(ife->ifm_media)) {
125 case IFM_100_TX:
126 case IFM_10_T:
127 /*
128 * Report fake lost link event to parent
129 * driver. This will stop MAC of parent
130 * driver and make it possible to reconfigure
131 * MAC after completion of link establishment.
132 * Note, the parent MAC seems to require
133 * restarting MAC when underlying any PHY
134 * configuration was changed even if the
135 * resolved speed/duplex was not changed at
136 * all.
137 */
138 mii->mii_media_status = 0;
139 mii->mii_media_active = IFM_ETHER | IFM_NONE;
140 rsc->mii_link_tick = RDCPHY_MANNEG_TICK;
141 /* Immediately report link down. */
142 mii_phy_update(sc, MII_MEDIACHG);
143 return (0);
144 default:
145 break;
146 }
147 break;
148
149 case MII_TICK:
150 if (mii_phy_tick(sc) == EJUSTRETURN)
151 return (0);
152 if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
153 /*
154 * It seems the PHY hardware does not correctly
155 * report link status changes when manual link
156 * configuration is in progress. It is also
157 * possible for the PHY to complete establishing
158 * a link within one second such that mii(4)
159 * did not notice the link change. To workaround
160 * the issue, emulate lost link event and wait
161 * for 3 seconds when manual link configuration
162 * is in progress. 3 seconds would be long
163 * enough to absorb transient link flips.
164 */
165 if (rsc->mii_link_tick > 0) {
166 rsc->mii_link_tick--;
167 return (0);
168 }
169 }
170 break;
171 }
172
173 /* Update the media status. */
174 PHY_STATUS(sc);
175
176 /* Callback if something changed. */
177 mii_phy_update(sc, cmd);
178 return (0);
179 }
180
181 static void
rdcphy_status(struct mii_softc * sc)182 rdcphy_status(struct mii_softc *sc)
183 {
184 struct mii_data *mii;
185 int bmsr, bmcr, physts;
186
187 mii = sc->mii_pdata;
188
189 mii->mii_media_status = IFM_AVALID;
190 mii->mii_media_active = IFM_ETHER;
191
192 bmsr = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
193 physts = PHY_READ(sc, MII_RDCPHY_STATUS);
194
195 if ((physts & STATUS_LINK_UP) != 0)
196 mii->mii_media_status |= IFM_ACTIVE;
197
198 bmcr = PHY_READ(sc, MII_BMCR);
199 if ((bmcr & BMCR_ISO) != 0) {
200 mii->mii_media_active |= IFM_NONE;
201 mii->mii_media_status = 0;
202 return;
203 }
204
205 if ((bmcr & BMCR_LOOP) != 0)
206 mii->mii_media_active |= IFM_LOOP;
207
208 if ((bmcr & BMCR_AUTOEN) != 0) {
209 if ((bmsr & BMSR_ACOMP) == 0) {
210 /* Erg, still trying, I guess... */
211 mii->mii_media_active |= IFM_NONE;
212 return;
213 }
214 }
215
216 switch (physts & STATUS_SPEED_MASK) {
217 case STATUS_SPEED_100:
218 mii->mii_media_active |= IFM_100_TX;
219 break;
220 case STATUS_SPEED_10:
221 mii->mii_media_active |= IFM_10_T;
222 break;
223 default:
224 mii->mii_media_active |= IFM_NONE;
225 return;
226 }
227 if ((physts & STATUS_FULL_DUPLEX) != 0)
228 mii->mii_media_active |= IFM_FDX | mii_phy_flowstatus(sc);
229 else
230 mii->mii_media_active |= IFM_HDX;
231 }
232