1/* $NetBSD: am79c930.c,v 1.16 2008/04/28 20:23:49 martin Exp $ */
2
3/*-
4 * Copyright (c) 1999 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Bill Sommerfeld
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * Am79c930 chip driver.
34 *
35 * This is used by the awi driver to use the shared
36 * memory attached to the 79c930 to communicate with the firmware running
37 * in the 930's on-board 80188 core.
38 *
39 * The 79c930 can be mapped into just I/O space, or also have a
40 * memory mapping; the mapping must be set up by the bus front-end
41 * before am79c930_init is called.
42 */
43
44/*
45 * operations:
46 *
47 * read_8, read_16, read_32, read_64, read_bytes
48 * write_8, write_16, write_32, write_64, write_bytes
49 * (two versions, depending on whether memory-space or i/o space is in use).
50 *
51 * interrupt E.C.
52 * start isr
53 * end isr
54 */
55
56#include <sys/cdefs.h>
57#ifdef __NetBSD__
58__KERNEL_RCSID(0, "$NetBSD: am79c930.c,v 1.16 2008/04/28 20:23:49 martin Exp $");
59#endif
60#ifdef __FreeBSD__
61__FBSDID("$FreeBSD$");
62#endif
63
64#include <sys/param.h>
65#include <sys/systm.h>
66#include <sys/endian.h>
67#ifndef __FreeBSD__
68#include <sys/device.h>
69#endif
70
71#include <sys/cpu.h>
72#ifdef __FreeBSD__
73#include <machine/bus_pio.h>
74#include <machine/bus_memio.h>
75#endif
76#include <sys/bus.h>
77#ifdef __NetBSD__
78#include <sys/intr.h>
79#endif
80
81#ifdef __NetBSD__
82#include <dev/ic/am79c930reg.h>
83#include <dev/ic/am79c930var.h>
84#endif
85#ifdef __FreeBSD__
86#include <dev/awi/am79c930reg.h>
87#include <dev/awi/am79c930var.h>
88#endif
89
90#define AM930_DELAY(x) /*nothing*/
91
92#ifndef __BUS_SPACE_HAS_STREAM_METHODS
93#define bus_space_read_stream_2 bus_space_read_2
94#define bus_space_read_stream_4 bus_space_read_4
95#define bus_space_write_stream_2 bus_space_write_2
96#define bus_space_write_stream_4 bus_space_write_4
97#endif /* __BUS_SPACE_HAS_STREAM_METHODS */
98
99void am79c930_regdump(struct am79c930_softc *sc);
100
101static void io_write_1(struct am79c930_softc *, u_int32_t, u_int8_t);
102static void io_write_2(struct am79c930_softc *, u_int32_t, u_int16_t);
103static void io_write_4(struct am79c930_softc *, u_int32_t, u_int32_t);
104static void io_write_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);
105
106static u_int8_t io_read_1(struct am79c930_softc *, u_int32_t);
107static u_int16_t io_read_2(struct am79c930_softc *, u_int32_t);
108static u_int32_t io_read_4(struct am79c930_softc *, u_int32_t);
109static void io_read_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);
110
111static void mem_write_1(struct am79c930_softc *, u_int32_t, u_int8_t);
112static void mem_write_2(struct am79c930_softc *, u_int32_t, u_int16_t);
113static void mem_write_4(struct am79c930_softc *, u_int32_t, u_int32_t);
114static void mem_write_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);
115
116static u_int8_t mem_read_1(struct am79c930_softc *, u_int32_t);
117static u_int16_t mem_read_2(struct am79c930_softc *, u_int32_t);
118static u_int32_t mem_read_4(struct am79c930_softc *, u_int32_t);
119static void mem_read_bytes(struct am79c930_softc *, u_int32_t, u_int8_t *, size_t);
120
121static struct am79c930_ops iospace_ops = {
122 io_write_1,
123 io_write_2,
124 io_write_4,
125 io_write_bytes,
126 io_read_1,
127 io_read_2,
128 io_read_4,
129 io_read_bytes
130};
131
132struct am79c930_ops memspace_ops = {
133 mem_write_1,
134 mem_write_2,
135 mem_write_4,
136 mem_write_bytes,
137 mem_read_1,
138 mem_read_2,
139 mem_read_4,
140 mem_read_bytes
141};
142
143static void
144io_write_1( struct am79c930_softc *sc, u_int32_t off, u_int8_t val)
145{
146 AM930_DELAY(1);
147 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
148 ((off>>8)& 0x7f));
149 AM930_DELAY(1);
150 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
151 AM930_DELAY(1);
152 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA, val);
153 AM930_DELAY(1);
154}
155
156static void
157io_write_2(struct am79c930_softc *sc, u_int32_t off, u_int16_t val)
158{
159 AM930_DELAY(1);
160 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
161 ((off>>8)& 0x7f));
162 AM930_DELAY(1);
163 bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_LMA_LO, (off&0xff));
164 AM930_DELAY(1);
165 bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA, val & 0xff);
166 AM930_DELAY(1);
167 bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA, (val>>8)&0xff);
168 AM930_DELAY(1);
169}
170
171static void
172io_write_4(struct am79c930_softc *sc, u_int32_t off, u_int32_t val)
173{
174 AM930_DELAY(1);
175 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
176 ((off>>8)& 0x7f));
177 AM930_DELAY(1);
178 bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_LMA_LO, (off&0xff));
179 AM930_DELAY(1);
180 bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,val & 0xff);
181 AM930_DELAY(1);
182 bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,(val>>8)&0xff);
183 AM930_DELAY(1);
184 bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,(val>>16)&0xff);
185 AM930_DELAY(1);
186 bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,(val>>24)&0xff);
187 AM930_DELAY(1);
188}
189
190static void
191io_write_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
192 size_t len)
193{
194 int i;
195
196 AM930_DELAY(1);
197 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
198 ((off>>8)& 0x7f));
199 AM930_DELAY(1);
200 bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_LMA_LO, (off&0xff));
201 AM930_DELAY(1);
202 for (i=0; i<len; i++)
203 bus_space_write_1(sc->sc_iot,sc->sc_ioh,AM79C930_IODPA,ptr[i]);
204}
205
206static u_int8_t
207io_read_1(struct am79c930_softc *sc, u_int32_t off)
208{
209 u_int8_t val;
210
211 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
212 ((off>>8)& 0x7f));
213 AM930_DELAY(1);
214 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
215 AM930_DELAY(1);
216 val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA);
217 AM930_DELAY(1);
218 return val;
219}
220
221static u_int16_t
222io_read_2(struct am79c930_softc *sc, u_int32_t off)
223{
224 u_int16_t val;
225
226 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
227 ((off>>8)& 0x7f));
228 AM930_DELAY(1);
229 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
230 AM930_DELAY(1);
231 val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA);
232 AM930_DELAY(1);
233 val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 8;
234 AM930_DELAY(1);
235 return val;
236}
237
238static u_int32_t
239io_read_4(struct am79c930_softc *sc, u_int32_t off)
240{
241 u_int32_t val;
242
243 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
244 ((off>>8)& 0x7f));
245 AM930_DELAY(1);
246 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
247 AM930_DELAY(1);
248 val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA);
249 AM930_DELAY(1);
250 val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 8;
251 AM930_DELAY(1);
252 val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 16;
253 AM930_DELAY(1);
254 val |= bus_space_read_1(sc->sc_iot, sc->sc_ioh, AM79C930_IODPA) << 24;
255 AM930_DELAY(1);
256 return val;
257}
258
259static void
260io_read_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
261 size_t len)
262{
263 int i;
264
265 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_HI,
266 ((off>>8)& 0x7f));
267 AM930_DELAY(1);
268 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_LMA_LO, (off&0xff));
269 AM930_DELAY(1);
270 for (i=0; i<len; i++)
271 ptr[i] = bus_space_read_1(sc->sc_iot, sc->sc_ioh,
272 AM79C930_IODPA);
273}
274
275static void
276mem_write_1(struct am79c930_softc *sc, u_int32_t off, u_int8_t val)
277{
278 bus_space_write_1(sc->sc_memt, sc->sc_memh, off, val);
279}
280
281static void
282mem_write_2(struct am79c930_softc *sc, u_int32_t off, u_int16_t val)
283{
284 bus_space_tag_t t = sc->sc_memt;
285 bus_space_handle_t h = sc->sc_memh;
286
287 /* could be unaligned */
288 if ((off & 0x1) == 0)
289 bus_space_write_stream_2(t, h, off, htole16(val));
290 else {
291 bus_space_write_1(t, h, off, val & 0xff);
292 bus_space_write_1(t, h, off+1, (val >> 8) & 0xff);
293 }
294}
295
296static void
297mem_write_4(struct am79c930_softc *sc, u_int32_t off, u_int32_t val)
298{
299 bus_space_tag_t t = sc->sc_memt;
300 bus_space_handle_t h = sc->sc_memh;
301
302 /* could be unaligned */
303 if ((off & 0x3) == 0)
304 bus_space_write_stream_4(t, h, off, htole32(val));
305 else {
306 bus_space_write_1(t, h, off, val & 0xff);
307 bus_space_write_1(t, h, off+1, (val >> 8) & 0xff);
308 bus_space_write_1(t, h, off+2, (val >> 16) & 0xff);
309 bus_space_write_1(t, h, off+3, (val >> 24) & 0xff);
310 }
311}
312
313static void
314mem_write_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
315 size_t len)
316{
317 bus_space_write_region_1 (sc->sc_memt, sc->sc_memh, off, ptr, len);
318}
319
320static u_int8_t
321mem_read_1(struct am79c930_softc *sc, u_int32_t off)
322{
323 return bus_space_read_1(sc->sc_memt, sc->sc_memh, off);
324}
325
326static u_int16_t
327mem_read_2(struct am79c930_softc *sc, u_int32_t off)
328{
329 /* could be unaligned */
330 if ((off & 0x1) == 0)
331 return le16toh(bus_space_read_stream_2(sc->sc_memt,
332 sc->sc_memh, off));
333 else
334 return
335 bus_space_read_1(sc->sc_memt, sc->sc_memh, off ) |
336 (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+1) << 8);
337}
338
339static u_int32_t
340mem_read_4(struct am79c930_softc *sc, u_int32_t off)
341{
342 /* could be unaligned */
343 if ((off & 0x3) == 0)
344 return le32toh(bus_space_read_stream_4(sc->sc_memt, sc->sc_memh,
345 off));
346 else
347 return
348 bus_space_read_1(sc->sc_memt, sc->sc_memh, off ) |
349 (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+1) << 8) |
350 (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+2) <<16) |
351 (bus_space_read_1(sc->sc_memt, sc->sc_memh, off+3) <<24);
352}
353
354static void
355mem_read_bytes(struct am79c930_softc *sc, u_int32_t off, u_int8_t *ptr,
356 size_t len)
357{
358 bus_space_read_region_1 (sc->sc_memt, sc->sc_memh, off, ptr, len);
359}
360
361
362/*
363 * Set bits in GCR.
364 */
365
366void
367am79c930_gcr_setbits(struct am79c930_softc *sc, u_int8_t bits)
368{
369 u_int8_t gcr = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);
370
371 gcr |= bits;
372
373 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_GCR, gcr);
374}
375
376/*
377 * Clear bits in GCR.
378 */
379
380void
381am79c930_gcr_clearbits(struct am79c930_softc *sc, u_int8_t bits)
382{
383 u_int8_t gcr = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);
384
385 gcr &= ~bits;
386
387 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_GCR, gcr);
388}
389
390u_int8_t
391am79c930_gcr_read(struct am79c930_softc *sc)
392{
393 return bus_space_read_1 (sc->sc_iot, sc->sc_ioh, AM79C930_GCR);
394}
395
396#if 0
397void
398am79c930_regdump(struct am79c930_softc *sc)
399{
400 u_int8_t buf[8];
401 int i;
402
403 AM930_DELAY(5);
404 for (i=0; i<8; i++) {
405 buf[i] = bus_space_read_1 (sc->sc_iot, sc->sc_ioh, i);
406 AM930_DELAY(5);
407 }
408 printf("am79c930: regdump:");
409 for (i=0; i<8; i++) {
410 printf(" %02x", buf[i]);
411 }
412 printf("\n");
413}
414#endif
415
416void
417am79c930_chip_init(struct am79c930_softc *sc, int how)
418{
419 /* zero the bank select register, and leave it that way.. */
420 bus_space_write_1(sc->sc_iot, sc->sc_ioh, AM79C930_BSS, 0);
421 if (how)
422 sc->sc_ops = &memspace_ops;
423 else
424 sc->sc_ops = &iospace_ops;
425}
426