mii.c revision 50391 
1/*	$NetBSD: mii.c,v 1.12 1999/08/03 19:41:49 drochner Exp $	*/
2
3/*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
9 * NASA Ames Research Center.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *	This product includes software developed by the NetBSD
22 *	Foundation, Inc. and its contributors.
23 * 4. Neither the name of The NetBSD Foundation nor the names of its
24 *    contributors may be used to endorse or promote products derived
25 *    from this software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40/*
41 * MII bus layer, glues MII-capable network interface drivers to sharable
42 * PHY drivers.  This exports an interface compatible with BSD/OS 3.0's,
43 * plus some NetBSD extensions.
44 */
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/socket.h>
49#include <sys/malloc.h>
50#include <sys/module.h>
51#include <sys/bus.h>
52
53#include <net/if.h>
54#include <net/if_media.h>
55
56#include <dev/mii/mii.h>
57#include <dev/mii/miivar.h>
58
59#include "miibus_if.h"
60
61#if !defined(lint)
62static const char rcsid[] =
63	"$Id: mii.c,v 1.1 1999/08/21 17:40:41 wpaul Exp $";
64#endif
65
66static int miibus_readreg	__P((device_t, int, int));
67static int miibus_writereg	__P((device_t, int, int, int));
68static void miibus_statchg	__P((device_t));
69static void miibus_mediainit	__P((device_t));
70
71static device_method_t miibus_methods[] = {
72	/* device interface */
73	DEVMETHOD(device_probe,		miibus_probe),
74	DEVMETHOD(device_attach,	miibus_attach),
75	DEVMETHOD(device_detach,	miibus_detach),
76	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
77
78	/* bus interface */
79	DEVMETHOD(bus_print_child,	bus_generic_print_child),
80	DEVMETHOD(bus_driver_added,	bus_generic_driver_added),
81
82	/* MII interface */
83	DEVMETHOD(miibus_readreg,	miibus_readreg),
84	DEVMETHOD(miibus_writereg,	miibus_writereg),
85	DEVMETHOD(miibus_statchg,	miibus_statchg),
86	DEVMETHOD(miibus_mediainit,	miibus_mediainit),
87
88	{ 0, 0 }
89};
90
91devclass_t miibus_devclass;
92
93driver_t miibus_driver = {
94	"miibus",
95	miibus_methods,
96	sizeof(struct mii_data)
97};
98
99/*
100 * Helper function used by network interface drivers, attaches PHYs
101 * to the network interface driver parent.
102 */
103
104int miibus_probe(dev)
105	device_t		dev;
106{
107	struct mii_attach_args	ma, *args;
108	struct mii_data		*mii;
109	device_t		child = 0, parent;
110	int			bmsr, capmask = 0xFFFFFFFF;
111
112	mii = device_get_softc(dev);
113	parent = device_get_parent(dev);
114	LIST_INIT(&mii->mii_phys);
115
116	for (ma.mii_phyno = 0; ma.mii_phyno < MII_NPHY; ma.mii_phyno++) {
117		/*
118		 * Check to see if there is a PHY at this address.  Note,
119		 * many braindead PHYs report 0/0 in their ID registers,
120		 * so we test for media in the BMSR.
121	 	 */
122		bmsr = MIIBUS_READREG(parent, ma.mii_phyno, MII_BMSR);
123		if (bmsr == 0 || bmsr == 0xffff ||
124		    (bmsr & BMSR_MEDIAMASK) == 0) {
125			/* Assume no PHY at this address. */
126			continue;
127		}
128
129		/*
130		 * Extract the IDs. Braindead PHYs will be handled by
131		 * the `ukphy' driver, as we have no ID information to
132		 * match on.
133	 	 */
134		ma.mii_id1 = MIIBUS_READREG(parent, ma.mii_phyno,
135		    MII_PHYIDR1);
136		ma.mii_id2 = MIIBUS_READREG(parent, ma.mii_phyno,
137		    MII_PHYIDR2);
138
139		ma.mii_data = mii;
140		ma.mii_capmask = capmask;
141
142		args = malloc(sizeof(struct mii_attach_args),
143		    M_DEVBUF, M_NOWAIT);
144		bcopy((char *)&ma, (char *)args, sizeof(ma));
145		child = device_add_child(dev, NULL, -1, args);
146	}
147
148	if (child == NULL)
149		return(ENXIO);
150
151	device_set_desc(dev, "MII bus");
152
153	return(0);
154}
155
156int miibus_attach(dev)
157	device_t		dev;
158{
159	void			**v;
160	ifm_change_cb_t		ifmedia_upd;
161	ifm_stat_cb_t		ifmedia_sts;
162	struct mii_data		*mii;
163
164	mii = device_get_softc(dev);
165	mii->mii_ifp = device_get_softc(device_get_parent(dev));
166	v = device_get_ivars(dev);
167	ifmedia_upd = v[0];
168	ifmedia_sts = v[1];
169	ifmedia_init(&mii->mii_media, IFM_IMASK, ifmedia_upd, ifmedia_sts);
170	bus_generic_attach(dev);
171
172	return(0);
173}
174
175int miibus_detach(dev)
176	device_t		dev;
177{
178	struct mii_data		*mii;
179
180	bus_generic_detach(dev);
181	mii = device_get_softc(dev);
182	ifmedia_removeall(&mii->mii_media);
183	mii->mii_ifp = NULL;
184
185	return(0);
186}
187
188static int miibus_readreg(dev, phy, reg)
189	device_t		dev;
190	int			phy, reg;
191{
192	device_t		parent;
193
194	parent = device_get_parent(dev);
195	return(MIIBUS_READREG(parent, phy, reg));
196}
197
198static int miibus_writereg(dev, phy, reg, data)
199	device_t		dev;
200	int			phy, reg, data;
201{
202	device_t		parent;
203
204	parent = device_get_parent(dev);
205	return(MIIBUS_WRITEREG(parent, phy, reg, data));
206}
207
208static void miibus_statchg(dev)
209	device_t		dev;
210{
211	device_t		parent;
212
213	parent = device_get_parent(dev);
214	MIIBUS_STATCHG(parent);
215	return;
216}
217
218static void miibus_mediainit(dev)
219	device_t		dev;
220{
221	struct mii_data		*mii;
222	struct ifmedia_entry	*m;
223	int			media = 0;
224
225	mii = device_get_softc(dev);
226	for (m = LIST_FIRST(&mii->mii_media.ifm_list); m != NULL;
227	     m = LIST_NEXT(m, ifm_list)) {
228		media = m->ifm_media;
229		if (media == (IFM_ETHER|IFM_AUTO))
230			break;
231	}
232
233	ifmedia_set(&mii->mii_media, media);
234
235	return;
236}
237
238int mii_phy_probe(dev, child, ifmedia_upd, ifmedia_sts)
239	device_t		dev;
240	device_t		*child;
241	ifm_change_cb_t		ifmedia_upd;
242	ifm_stat_cb_t		ifmedia_sts;
243{
244	void			**v;
245	int			bmsr, i;
246
247	v = malloc(sizeof(vm_offset_t) * 2, M_DEVBUF, M_NOWAIT);
248	v[0] = ifmedia_upd;
249	v[1] = ifmedia_sts;
250	*child = device_add_child(dev, "miibus", -1, v);
251
252	for (i = 0; i < MII_NPHY; i++) {
253		bmsr = MIIBUS_READREG(dev, i, MII_BMSR);
254                if (bmsr == 0 || bmsr == 0xffff ||
255                    (bmsr & BMSR_MEDIAMASK) == 0) {
256                        /* Assume no PHY at this address. */
257                        continue;
258                } else
259			break;
260	}
261
262	if (i == MII_NPHY) {
263		device_delete_child(dev, *child);
264		*child = NULL;
265		return(ENXIO);
266	}
267
268	bus_generic_attach(dev);
269
270	return(0);
271}
272
273/*
274 * Media changed; notify all PHYs.
275 */
276int
277mii_mediachg(mii)
278	struct mii_data *mii;
279{
280	struct mii_softc *child;
281	int rv;
282
283	mii->mii_media_status = 0;
284	mii->mii_media_active = IFM_NONE;
285
286	for (child = LIST_FIRST(&mii->mii_phys); child != NULL;
287	     child = LIST_NEXT(child, mii_list)) {
288		rv = (*child->mii_service)(child, mii, MII_MEDIACHG);
289		if (rv)
290			return (rv);
291	}
292	return (0);
293}
294
295/*
296 * Call the PHY tick routines, used during autonegotiation.
297 */
298void
299mii_tick(mii)
300	struct mii_data *mii;
301{
302	struct mii_softc *child;
303
304	for (child = LIST_FIRST(&mii->mii_phys); child != NULL;
305	     child = LIST_NEXT(child, mii_list))
306		(void) (*child->mii_service)(child, mii, MII_TICK);
307}
308
309/*
310 * Get media status from PHYs.
311 */
312void
313mii_pollstat(mii)
314	struct mii_data *mii;
315{
316	struct mii_softc *child;
317
318	mii->mii_media_status = 0;
319	mii->mii_media_active = IFM_NONE;
320
321	for (child = LIST_FIRST(&mii->mii_phys); child != NULL;
322	     child = LIST_NEXT(child, mii_list))
323		(void) (*child->mii_service)(child, mii, MII_POLLSTAT);
324}
325