Annotation of sys/dev/isa/mpu401.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: mpu401.c,v 1.10 2006/04/07 22:41:33 jsg Exp $ */
2: /* $NetBSD: mpu401.c,v 1.3 1998/11/25 22:17:06 augustss Exp $ */
3:
4: /*
5: * Copyright (c) 1998 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Lennart Augustsson (augustss@netbsd.org).
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: #include <sys/param.h>
41: #include <sys/systm.h>
42: #include <sys/errno.h>
43: #include <sys/ioctl.h>
44: #include <sys/syslog.h>
45: #include <sys/device.h>
46: #include <sys/proc.h>
47: #include <sys/buf.h>
48:
49: #include <machine/cpu.h>
50: #include <machine/intr.h>
51: #include <machine/bus.h>
52:
53: #include <dev/midi_if.h>
54:
55: #include <dev/isa/isavar.h>
56: #include <dev/isa/isadmavar.h>
57:
58: #include <dev/ic/mpuvar.h>
59:
60: #ifndef splaudio
61: #define splaudio() splbio() /* XXX found in audio_if.h normally */
62: #endif
63:
64: #ifdef AUDIO_DEBUG
65: #define DPRINTF(x) if (mpu401debug) printf x
66: #define DPRINTFN(n,x) if (mpu401debug >= (n)) printf x
67: int mpu401debug = 0;
68: #else
69: #define DPRINTF(x)
70: #define DPRINTFN(n,x)
71: #endif
72:
73: #define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS))
74:
75: int mpu_reset(struct mpu_softc *);
76: static __inline int mpu_waitready(struct mpu_softc *);
77: void mpu_readinput(struct mpu_softc *);
78:
79: struct cfdriver mpu_cd = {
80: NULL, "mpu", DV_DULL
81: };
82:
83: struct midi_hw_if mpu_midi_hw_if = {
84: mpu_open,
85: mpu_close,
86: mpu_output,
87: 0, /* flush */
88: mpu_getinfo,
89: 0, /* ioctl */
90: };
91:
92: int
93: mpu_find(v)
94: void *v;
95: {
96: struct mpu_softc *sc = v;
97:
98: if (MPU_GETSTATUS(sc->iot, sc->ioh) == 0xff) {
99: DPRINTF(("mpu_find: No status\n"));
100: goto bad;
101: }
102: sc->open = 0;
103: sc->intr = 0;
104: if (mpu_reset(sc) == 0)
105: return 1;
106: bad:
107: return 0;
108: }
109:
110: static __inline int
111: mpu_waitready(sc)
112: struct mpu_softc *sc;
113: {
114: int i;
115:
116: for(i = 0; i < MPU_MAXWAIT; i++) {
117: if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_OUTPUT_BUSY))
118: return 0;
119: delay(10);
120: }
121: return 1;
122: }
123:
124: int
125: mpu_reset(sc)
126: struct mpu_softc *sc;
127: {
128: bus_space_tag_t iot = sc->iot;
129: bus_space_handle_t ioh = sc->ioh;
130: int i;
131: int s;
132:
133: if (mpu_waitready(sc)) {
134: DPRINTF(("mpu_reset: not ready\n"));
135: return EIO;
136: }
137: s = splaudio(); /* Don't let the interrupt get our ACK. */
138: bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET);
139: for(i = 0; i < 2*MPU_MAXWAIT; i++) {
140: if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) &&
141: bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) {
142: splx(s);
143: return 0;
144: }
145: }
146: splx(s);
147: DPRINTF(("mpu_reset: No ACK\n"));
148: return EIO;
149: }
150:
151: int
152: mpu_open(v, flags, iintr, ointr, arg)
153: void *v;
154: int flags;
155: void (*iintr)(void *, int);
156: void (*ointr)(void *);
157: void *arg;
158: {
159: struct mpu_softc *sc = v;
160:
161: DPRINTF(("mpu_open: sc=%p\n", sc));
162:
163: if (sc->open)
164: return EBUSY;
165: if (mpu_reset(sc) != 0)
166: return EIO;
167:
168: bus_space_write_1(sc->iot, sc->ioh, MPU_COMMAND, MPU_UART_MODE);
169: sc->open = 1;
170: sc->intr = iintr;
171: sc->arg = arg;
172: return 0;
173: }
174:
175: void
176: mpu_close(v)
177: void *v;
178: {
179: struct mpu_softc *sc = v;
180:
181: DPRINTF(("mpu_close: sc=%p\n", sc));
182:
183: sc->open = 0;
184: sc->intr = 0;
185: mpu_reset(sc); /* exit UART mode */
186: }
187:
188: void
189: mpu_readinput(sc)
190: struct mpu_softc *sc;
191: {
192: bus_space_tag_t iot = sc->iot;
193: bus_space_handle_t ioh = sc->ioh;
194: int data;
195:
196: while(!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY)) {
197: data = bus_space_read_1(iot, ioh, MPU_DATA);
198: DPRINTFN(3, ("mpu_rea: sc=%p 0x%02x\n", sc, data));
199: if (sc->intr)
200: sc->intr(sc->arg, data);
201: }
202: }
203:
204: int
205: mpu_output(v, d)
206: void *v;
207: int d;
208: {
209: struct mpu_softc *sc = v;
210: int s;
211:
212: DPRINTFN(3, ("mpu_output: sc=%p 0x%02x\n", sc, d));
213: if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY)) {
214: s = splaudio();
215: mpu_readinput(sc);
216: splx(s);
217: }
218: if (mpu_waitready(sc)) {
219: DPRINTF(("mpu_output: not ready\n"));
220: return EIO;
221: }
222: bus_space_write_1(sc->iot, sc->ioh, MPU_DATA, d);
223: return 0;
224: }
225:
226: void
227: mpu_getinfo(addr, mi)
228: void *addr;
229: struct midi_info *mi;
230: {
231: mi->name = "MPU-401 MIDI UART";
232: mi->props = 0;
233: }
234:
235: int
236: mpu_intr(v)
237: void *v;
238: {
239: struct mpu_softc *sc = v;
240:
241: if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY) {
242: DPRINTF(("mpu_intr: no data\n"));
243: return 0;
244: }
245: mpu_readinput(sc);
246: return 1;
247: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to mpu401.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / dev / isa