mpu.c revision 1.12.20.1
1 /* $NetBSD: mpu.c,v 1.12.20.1 2006/11/18 21:34:13 ad 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 Lennart Augustsson (augustss (at) NetBSD.org). 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: mpu.c,v 1.12.20.1 2006/11/18 21:34:13 ad Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/errno.h> 45 #include <sys/ioctl.h> 46 #include <sys/syslog.h> 47 #include <sys/device.h> 48 #include <sys/proc.h> 49 #include <sys/buf.h> 50 51 #include <machine/cpu.h> 52 #include <machine/intr.h> 53 #include <machine/bus.h> 54 55 #include <dev/midi_if.h> 56 57 #include <dev/ic/mpuvar.h> 58 59 #ifdef AUDIO_DEBUG 60 #define DPRINTF(x) if (mpudebug) printf x 61 #define DPRINTFN(n,x) if (mpudebug >= (n)) printf x 62 int mpudebug = 0; 63 #else 64 #define DPRINTF(x) 65 #define DPRINTFN(n,x) 66 #endif 67 68 #define MPU_DATA 0 69 #define MPU_COMMAND 1 70 #define MPU_RESET 0xff 71 #define MPU_UART_MODE 0x3f 72 #define MPU_ACK 0xfe 73 #define MPU_STATUS 1 74 #define MPU_OUTPUT_BUSY 0x40 75 #define MPU_INPUT_EMPTY 0x80 76 77 #define MPU_MAXWAIT 10000 /* usec/10 to wait */ 78 79 #define MPU_GETSTATUS(iot, ioh) (bus_space_read_1(iot, ioh, MPU_STATUS)) 80 81 int mpu_reset(struct mpu_softc *); 82 static inline int mpu_waitready(struct mpu_softc *); 83 void mpu_readinput(struct mpu_softc *); 84 85 int mpu_open(void *, int, 86 void (*iintr)(void *, int), 87 void (*ointr)(void *), void *arg); 88 void mpu_close(void *); 89 int mpu_output(void *, int); 90 void mpu_getinfo(void *, struct midi_info *); 91 92 const struct midi_hw_if mpu_midi_hw_if = { 93 mpu_open, 94 mpu_close, 95 mpu_output, 96 mpu_getinfo, 97 0, /* ioctl */ 98 }; 99 100 int 101 mpu_find(sc) 102 struct mpu_softc *sc; 103 { 104 if (MPU_GETSTATUS(sc->iot, sc->ioh) == 0xff) { 105 DPRINTF(("mpu_find: No status\n")); 106 goto bad; 107 } 108 sc->open = 0; 109 sc->intr = 0; 110 if (mpu_reset(sc) == 0) 111 return 1; 112 bad: 113 return 0; 114 } 115 116 void 117 mpu_attach(sc) 118 struct mpu_softc *sc; 119 { 120 midi_attach_mi(&mpu_midi_hw_if, sc, &sc->sc_dev); 121 } 122 123 static inline int 124 mpu_waitready(sc) 125 struct mpu_softc *sc; 126 { 127 int i; 128 129 for(i = 0; i < MPU_MAXWAIT; i++) { 130 if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_OUTPUT_BUSY)) 131 return 0; 132 delay(10); 133 } 134 return 1; 135 } 136 137 int 138 mpu_reset(sc) 139 struct mpu_softc *sc; 140 { 141 bus_space_tag_t iot = sc->iot; 142 bus_space_handle_t ioh = sc->ioh; 143 int i; 144 int s; 145 146 if (mpu_waitready(sc)) { 147 DPRINTF(("mpu_reset: not ready\n")); 148 return EIO; 149 } 150 s = splaudio(); /* Don't let the interrupt get our ACK. */ 151 bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET); 152 for(i = 0; i < 2*MPU_MAXWAIT; i++) { 153 if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) && 154 bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) { 155 splx(s); 156 return 0; 157 } 158 } 159 splx(s); 160 DPRINTF(("mpu_reset: No ACK\n")); 161 return EIO; 162 } 163 164 int 165 mpu_open(void *addr, int flags, void (*iintr)(void *, int), 166 void (*ointr)(void *), void *arg) 167 { 168 struct mpu_softc *sc = addr; 169 170 DPRINTF(("mpu_open: sc=%p\n", sc)); 171 172 if (sc->open) 173 return EBUSY; 174 #ifndef AUDIO_NO_POWER_CTL 175 if (sc->powerctl) 176 sc->powerctl(sc->powerarg, 1); 177 #endif 178 if (mpu_reset(sc) != 0) { 179 #ifndef AUDIO_NO_POWER_CTL 180 if (sc->powerctl) 181 sc->powerctl(sc->powerarg, 0); 182 #endif 183 return EIO; 184 } 185 186 bus_space_write_1(sc->iot, sc->ioh, MPU_COMMAND, MPU_UART_MODE); 187 sc->open = 1; 188 sc->intr = iintr; 189 sc->arg = arg; 190 return 0; 191 } 192 193 void 194 mpu_close(addr) 195 void *addr; 196 { 197 struct mpu_softc *sc = addr; 198 199 DPRINTF(("mpu_close: sc=%p\n", sc)); 200 201 sc->open = 0; 202 sc->intr = 0; 203 mpu_reset(sc); /* exit UART mode */ 204 205 #ifndef AUDIO_NO_POWER_CTL 206 if (sc->powerctl) 207 sc->powerctl(sc->powerarg, 0); 208 #endif 209 } 210 211 void 212 mpu_readinput(sc) 213 struct mpu_softc *sc; 214 { 215 bus_space_tag_t iot = sc->iot; 216 bus_space_handle_t ioh = sc->ioh; 217 int data; 218 219 while(!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY)) { 220 data = bus_space_read_1(iot, ioh, MPU_DATA); 221 DPRINTFN(3, ("mpu_rea: sc=%p 0x%02x\n", sc, data)); 222 if (sc->intr) 223 sc->intr(sc->arg, data); 224 } 225 } 226 227 int 228 mpu_output(addr, d) 229 void *addr; 230 int d; 231 { 232 struct mpu_softc *sc = addr; 233 int s; 234 235 DPRINTFN(3, ("mpu_output: sc=%p 0x%02x\n", sc, d)); 236 if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY)) { 237 s = splaudio(); 238 mpu_readinput(sc); 239 splx(s); 240 } 241 if (mpu_waitready(sc)) { 242 DPRINTF(("mpu_output: not ready\n")); 243 return EIO; 244 } 245 bus_space_write_1(sc->iot, sc->ioh, MPU_DATA, d); 246 return 0; 247 } 248 249 void 250 mpu_getinfo(addr, mi) 251 void *addr; 252 struct midi_info *mi; 253 { 254 struct mpu_softc *sc = addr; 255 256 mi->name = sc->model; 257 mi->props = 0; 258 } 259 260 int 261 mpu_intr(addr) 262 void *addr; 263 { 264 struct mpu_softc *sc = addr; 265 266 if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY) { 267 DPRINTF(("mpu_intr: no data\n")); 268 return (0); 269 } else { 270 mpu_readinput(sc); 271 return (1); 272 } 273 } 274
Indexes created Tue Oct 07 11:09:55 GMT 2025