1/*	$NetBSD: if_le_ledma.c,v 1.38 2022/09/25 18:03:04 thorpej Exp $	*/
2
3/*-
4 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum; Jason R. Thorpe of the Numerical Aerospace
9 * Simulation Facility, NASA Ames Research Center; Paul Kranenburg.
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 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__KERNEL_RCSID(0, "$NetBSD: if_le_ledma.c,v 1.38 2022/09/25 18:03:04 thorpej Exp $");
35
36#include "opt_inet.h"
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/mbuf.h>
41#include <sys/syslog.h>
42#include <sys/socket.h>
43#include <sys/device.h>
44
45#include <net/if.h>
46#include <net/if_ether.h>
47#include <net/if_media.h>
48
49#ifdef INET
50#include <netinet/in.h>
51#include <netinet/if_inarp.h>
52#endif
53
54#include <sys/bus.h>
55#include <sys/intr.h>
56#include <machine/autoconf.h>
57
58#include <dev/sbus/sbusvar.h>
59
60#include <dev/ic/lsi64854reg.h>
61#include <dev/ic/lsi64854var.h>
62
63#include <dev/ic/lancereg.h>
64#include <dev/ic/lancevar.h>
65#include <dev/ic/am7990reg.h>
66#include <dev/ic/am7990var.h>
67
68#include "ioconf.h"
69
70/*
71 * LANCE registers.
72 */
73#define LEREG1_RDP	0	/* Register Data port */
74#define LEREG1_RAP	2	/* Register Address port */
75
76struct	le_softc {
77	struct	am7990_softc	sc_am7990;	/* glue to MI code */
78	bus_space_tag_t		sc_bustag;
79	bus_dmamap_t		sc_dmamap;
80	bus_space_handle_t	sc_reg;		/* LANCE registers */
81	struct	lsi64854_softc	*sc_dma;	/* pointer to my dma */
82	u_int			sc_laddr;	/* LANCE DMA address */
83	u_int			sc_lostcount;
84#define LE_LOSTTHRESH	5	/* lost carrior count to switch media */
85};
86
87#define MEMSIZE		(16*1024)	/* LANCE memory size */
88#define LEDMA_BOUNDARY	(16*1024*1024)	/* must not cross 16MB boundary */
89
90int	lematch_ledma(device_t, cfdata_t, void *);
91void	leattach_ledma(device_t, device_t, void *);
92
93/*
94 * Media types supported by the Sun4m.
95 */
96static int lemedia[] = {
97	IFM_ETHER | IFM_10_T,
98	IFM_ETHER | IFM_10_5,
99	IFM_ETHER | IFM_AUTO,
100};
101#define NLEMEDIA	__arraycount(lemedia)
102
103void	lesetutp(struct lance_softc *);
104void	lesetaui(struct lance_softc *);
105
106int	lemediachange(struct lance_softc *);
107void	lemediastatus(struct lance_softc *, struct ifmediareq *);
108
109CFATTACH_DECL_NEW(le_ledma, sizeof(struct le_softc),
110    lematch_ledma, leattach_ledma, NULL, NULL);
111
112#if defined(_KERNEL_OPT)
113#include "opt_ddb.h"
114#endif
115
116static void lewrcsr(struct lance_softc *, uint16_t, uint16_t);
117static uint16_t lerdcsr(struct lance_softc *, uint16_t);
118static void lehwreset(struct lance_softc *);
119static void lehwinit(struct lance_softc *);
120static void lenocarrier(struct lance_softc *);
121
122static void
123lewrcsr(struct lance_softc *sc, uint16_t port, uint16_t val)
124{
125	struct le_softc *lesc = (struct le_softc *)sc;
126	bus_space_tag_t t = lesc->sc_bustag;
127	bus_space_handle_t h = lesc->sc_reg;
128
129	bus_space_write_2(t, h, LEREG1_RAP, port);
130	bus_space_write_2(t, h, LEREG1_RDP, val);
131
132#if defined(SUN4M)
133	/*
134	 * We need to flush the Sbus->Mbus write buffers. This can most
135	 * easily be accomplished by reading back the register that we
136	 * just wrote (thanks to Chris Torek for this solution).
137	 */
138	(void)bus_space_read_2(t, h, LEREG1_RDP);
139#endif
140}
141
142static uint16_t
143lerdcsr(struct lance_softc *sc, uint16_t port)
144{
145	struct le_softc *lesc = (struct le_softc *)sc;
146	bus_space_tag_t t = lesc->sc_bustag;
147	bus_space_handle_t h = lesc->sc_reg;
148
149	bus_space_write_2(t, h, LEREG1_RAP, port);
150	return bus_space_read_2(t, h, LEREG1_RDP);
151}
152
153void
154lesetutp(struct lance_softc *sc)
155{
156	struct lsi64854_softc *dma = ((struct le_softc *)sc)->sc_dma;
157	uint32_t csr;
158
159	csr = L64854_GCSR(dma);
160	csr |= E_TP_AUI;
161	L64854_SCSR(dma, csr);
162	delay(20000);	/* must not touch le for 20ms */
163}
164
165void
166lesetaui(struct lance_softc *sc)
167{
168	struct lsi64854_softc *dma = ((struct le_softc *)sc)->sc_dma;
169	uint32_t csr;
170
171	csr = L64854_GCSR(dma);
172	csr &= ~E_TP_AUI;
173	L64854_SCSR(dma, csr);
174	delay(20000);	/* must not touch le for 20ms */
175}
176
177int
178lemediachange(struct lance_softc *sc)
179{
180	struct ifmedia *ifm = &sc->sc_media;
181
182	if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
183		return EINVAL;
184
185	/*
186	 * Switch to the selected media.  If autoselect is
187	 * set, we don't really have to do anything.  We'll
188	 * switch to the other media when we detect loss of
189	 * carrier.
190	 */
191	switch (IFM_SUBTYPE(ifm->ifm_media)) {
192	case IFM_10_T:
193		lesetutp(sc);
194		break;
195
196	case IFM_10_5:
197		lesetaui(sc);
198		break;
199
200	case IFM_AUTO:
201		break;
202
203	default:
204		return EINVAL;
205	}
206
207	return 0;
208}
209
210void
211lemediastatus(struct lance_softc *sc, struct ifmediareq *ifmr)
212{
213	struct lsi64854_softc *dma = ((struct le_softc *)sc)->sc_dma;
214
215	/*
216	 * Notify the world which media we're currently using.
217	 */
218	if (L64854_GCSR(dma) & E_TP_AUI)
219		ifmr->ifm_active = IFM_ETHER | IFM_10_T;
220	else
221		ifmr->ifm_active = IFM_ETHER | IFM_10_5;
222}
223
224static void
225lehwreset(struct lance_softc *sc)
226{
227	struct le_softc *lesc = (struct le_softc *)sc;
228	struct lsi64854_softc *dma = lesc->sc_dma;
229	uint32_t csr;
230	u_int aui_bit;
231
232	/*
233	 * Reset DMA channel.
234	 */
235	csr = L64854_GCSR(dma);
236	aui_bit = csr & E_TP_AUI;
237	DMA_RESET(dma);
238
239	/* Write bits 24-31 of Lance address */
240	bus_space_write_4(dma->sc_bustag, dma->sc_regs, L64854_REG_ENBAR,
241			  lesc->sc_laddr & 0xff000000);
242
243	DMA_ENINTR(dma);
244
245	/*
246	 * Disable E-cache invalidates on chip writes.
247	 * Retain previous cable selection bit.
248	 */
249	csr = L64854_GCSR(dma);
250	csr |= (E_DSBL_WR_INVAL | aui_bit);
251	L64854_SCSR(dma, csr);
252	delay(20000);	/* must not touch le for 20ms */
253}
254
255static void
256lehwinit(struct lance_softc *sc)
257{
258
259	/*
260	 * Make sure we're using the currently-enabled media type.
261	 * XXX Actually, this is probably unnecessary, now.
262	 */
263	switch (IFM_SUBTYPE(sc->sc_media.ifm_cur->ifm_media)) {
264	case IFM_10_T:
265		lesetutp(sc);
266		break;
267
268	case IFM_10_5:
269		lesetaui(sc);
270		break;
271	}
272}
273
274static void
275lenocarrier(struct lance_softc *sc)
276{
277	struct le_softc *lesc = (struct le_softc *)sc;
278
279	/* it may take a while for modern switches to set 10baseT media */
280	if (lesc->sc_lostcount++ < LE_LOSTTHRESH)
281		return;
282
283	lesc->sc_lostcount = 0;
284
285	/*
286	 * Check if the user has requested a certain cable type, and
287	 * if so, honor that request.
288	 */
289	printf("%s: lost carrier on ", device_xname(sc->sc_dev));
290
291	if (L64854_GCSR(lesc->sc_dma) & E_TP_AUI) {
292		printf("UTP port");
293		switch (IFM_SUBTYPE(sc->sc_media.ifm_media)) {
294		case IFM_10_5:
295		case IFM_AUTO:
296			printf(", switching to AUI port");
297			lesetaui(sc);
298		}
299	} else {
300		printf("AUI port");
301		switch (IFM_SUBTYPE(sc->sc_media.ifm_media)) {
302		case IFM_10_T:
303		case IFM_AUTO:
304			printf(", switching to UTP port");
305			lesetutp(sc);
306		}
307	}
308	printf("\n");
309}
310
311int
312lematch_ledma(device_t parent, cfdata_t cf, void *aux)
313{
314	struct sbus_attach_args *sa = aux;
315
316	return (strcmp(cf->cf_name, sa->sa_name) == 0);
317}
318
319
320void
321leattach_ledma(device_t parent, device_t self, void *aux)
322{
323	struct le_softc *lesc = device_private(self);
324	struct lance_softc *sc = &lesc->sc_am7990.lsc;
325	struct lsi64854_softc *lsi = device_private(parent);
326	struct sbus_attach_args *sa = aux;
327	bus_dma_tag_t dmatag = sa->sa_dmatag;
328	bus_dma_segment_t seg;
329	int rseg, error;
330
331	sc->sc_dev = self;
332	lesc->sc_bustag = sa->sa_bustag;
333
334	/* Establish link to `ledma' device */
335	lesc->sc_dma = lsi;
336	lesc->sc_dma->sc_client = lesc;
337
338	/* Map device registers */
339	if (sbus_bus_map(sa->sa_bustag,
340			 sa->sa_slot,
341			 sa->sa_offset,
342			 sa->sa_size,
343			 0, &lesc->sc_reg) != 0) {
344		aprint_error(": cannot map registers\n");
345		return;
346	}
347
348	/* Allocate buffer memory */
349	sc->sc_memsize = MEMSIZE;
350
351	/* Get a DMA handle */
352	if ((error = bus_dmamap_create(dmatag, MEMSIZE, 1, MEMSIZE,
353	    LEDMA_BOUNDARY, BUS_DMA_NOWAIT, &lesc->sc_dmamap)) != 0) {
354		aprint_error(": DMA map create error %d\n", error);
355		return;
356	}
357
358	/* Allocate DMA buffer */
359	if ((error = bus_dmamem_alloc(dmatag, MEMSIZE, 0, LEDMA_BOUNDARY,
360	    &seg, 1, &rseg, BUS_DMA_NOWAIT)) != 0) {
361		aprint_error(": DMA buffer alloc error %d\n",error);
362		goto bad_destroy;
363	}
364
365	/* Map DMA buffer into kernel space */
366	if ((error = bus_dmamem_map(dmatag, &seg, rseg, MEMSIZE,
367	    (void **)&sc->sc_mem, BUS_DMA_NOWAIT | BUS_DMA_COHERENT)) != 0) {
368		aprint_error(": DMA buffer map error %d\n", error);
369		goto bad_free;
370	}
371
372	/* Load DMA buffer */
373	if ((error = bus_dmamap_load(dmatag, lesc->sc_dmamap, sc->sc_mem,
374	    MEMSIZE, NULL, BUS_DMA_NOWAIT | BUS_DMA_COHERENT)) != 0) {
375		aprint_error(": DMA buffer map load error %d\n", error);
376		goto bad_unmap;
377	}
378
379	lesc->sc_laddr = lesc->sc_dmamap->dm_segs[0].ds_addr;
380	sc->sc_addr = lesc->sc_laddr & 0xffffff;
381	sc->sc_conf3 = LE_C3_BSWP | LE_C3_ACON | LE_C3_BCON;
382	lesc->sc_lostcount = 0;
383
384	sc->sc_mediachange = lemediachange;
385	sc->sc_mediastatus = lemediastatus;
386	sc->sc_supmedia = lemedia;
387	sc->sc_nsupmedia = NLEMEDIA;
388	sc->sc_defaultmedia = IFM_ETHER | IFM_AUTO;
389
390	prom_getether(sa->sa_node, sc->sc_enaddr);
391
392	sc->sc_copytodesc = lance_copytobuf_contig;
393	sc->sc_copyfromdesc = lance_copyfrombuf_contig;
394	sc->sc_copytobuf = lance_copytobuf_contig;
395	sc->sc_copyfrombuf = lance_copyfrombuf_contig;
396	sc->sc_zerobuf = lance_zerobuf_contig;
397
398	sc->sc_rdcsr = lerdcsr;
399	sc->sc_wrcsr = lewrcsr;
400	sc->sc_hwinit = lehwinit;
401	sc->sc_nocarrier = lenocarrier;
402	sc->sc_hwreset = lehwreset;
403
404	/* Establish interrupt handler */
405	if (sa->sa_nintr != 0)
406		(void)bus_intr_establish(sa->sa_bustag, sa->sa_pri, IPL_NET,
407					 am7990_intr, sc);
408
409	am7990_config(&lesc->sc_am7990);
410
411	/* now initialize DMA */
412	lehwreset(sc);
413
414	return;
415
416 bad_unmap:
417	bus_dmamem_unmap(dmatag, sc->sc_mem, MEMSIZE);
418 bad_free:
419	bus_dmamem_free(dmatag, &seg, rseg);
420 bad_destroy:
421	bus_dmamap_destroy(dmatag, lesc->sc_dmamap);
422}
423