1 /* $NetBSD: mpu.c,v 1.5 2001/11/13 13:14:41 lukem 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@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 1.5 2001/11/13 13:14:41 lukem 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 __P((void *, int, 86 void (*iintr)__P((void *, int)), 87 void (*ointr)__P((void *)), void *arg)); 88 void mpu_close __P((void *)); 89 int mpu_output __P((void *, int)); 90 void mpu_getinfo __P((void *, struct midi_info *)); 91 92 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 printf("\n"); 121 122 midi_attach_mi(&mpu_midi_hw_if, sc, &sc->sc_dev); 123 } 124 125 static __inline int 126 mpu_waitready(sc) 127 struct mpu_softc *sc; 128 { 129 int i; 130 131 for(i = 0; i < MPU_MAXWAIT; i++) { 132 if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_OUTPUT_BUSY)) 133 return 0; 134 delay(10); 135 } 136 return 1; 137 } 138 139 int 140 mpu_reset(sc) 141 struct mpu_softc *sc; 142 { 143 bus_space_tag_t iot = sc->iot; 144 bus_space_handle_t ioh = sc->ioh; 145 int i; 146 int s; 147 148 if (mpu_waitready(sc)) { 149 DPRINTF(("mpu_reset: not ready\n")); 150 return EIO; 151 } 152 s = splaudio(); /* Don't let the interrupt get our ACK. */ 153 bus_space_write_1(iot, ioh, MPU_COMMAND, MPU_RESET); 154 for(i = 0; i < 2*MPU_MAXWAIT; i++) { 155 if (!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY) && 156 bus_space_read_1(iot, ioh, MPU_DATA) == MPU_ACK) { 157 splx(s); 158 return 0; 159 } 160 } 161 splx(s); 162 DPRINTF(("mpu_reset: No ACK\n")); 163 return EIO; 164 } 165 166 int 167 mpu_open(addr, flags, iintr, ointr, arg) 168 void *addr; 169 int flags; 170 void (*iintr)__P((void *, int)); 171 void (*ointr)__P((void *)); 172 void *arg; 173 { 174 struct mpu_softc *sc = addr; 175 176 DPRINTF(("mpu_open: sc=%p\n", sc)); 177 178 if (sc->open) 179 return EBUSY; 180 #ifndef AUDIO_NO_POWER_CTL 181 if (sc->powerctl) 182 sc->powerctl(sc->powerarg, 1); 183 #endif 184 if (mpu_reset(sc) != 0) { 185 #ifndef AUDIO_NO_POWER_CTL 186 if (sc->powerctl) 187 sc->powerctl(sc->powerarg, 0); 188 #endif 189 return EIO; 190 } 191 192 bus_space_write_1(sc->iot, sc->ioh, MPU_COMMAND, MPU_UART_MODE); 193 sc->open = 1; 194 sc->intr = iintr; 195 sc->arg = arg; 196 return 0; 197 } 198 199 void 200 mpu_close(addr) 201 void *addr; 202 { 203 struct mpu_softc *sc = addr; 204 205 DPRINTF(("mpu_close: sc=%p\n", sc)); 206 207 sc->open = 0; 208 sc->intr = 0; 209 mpu_reset(sc); /* exit UART mode */ 210 211 #ifndef AUDIO_NO_POWER_CTL 212 if (sc->powerctl) 213 sc->powerctl(sc->powerarg, 0); 214 #endif 215 } 216 217 void 218 mpu_readinput(sc) 219 struct mpu_softc *sc; 220 { 221 bus_space_tag_t iot = sc->iot; 222 bus_space_handle_t ioh = sc->ioh; 223 int data; 224 225 while(!(MPU_GETSTATUS(iot, ioh) & MPU_INPUT_EMPTY)) { 226 data = bus_space_read_1(iot, ioh, MPU_DATA); 227 DPRINTFN(3, ("mpu_rea: sc=%p 0x%02x\n", sc, data)); 228 if (sc->intr) 229 sc->intr(sc->arg, data); 230 } 231 } 232 233 int 234 mpu_output(addr, d) 235 void *addr; 236 int d; 237 { 238 struct mpu_softc *sc = addr; 239 int s; 240 241 DPRINTFN(3, ("mpu_output: sc=%p 0x%02x\n", sc, d)); 242 if (!(MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY)) { 243 s = splaudio(); 244 mpu_readinput(sc); 245 splx(s); 246 } 247 if (mpu_waitready(sc)) { 248 DPRINTF(("mpu_output: not ready\n")); 249 return EIO; 250 } 251 bus_space_write_1(sc->iot, sc->ioh, MPU_DATA, d); 252 return 0; 253 } 254 255 void 256 mpu_getinfo(addr, mi) 257 void *addr; 258 struct midi_info *mi; 259 { 260 struct mpu_softc *sc = addr; 261 262 mi->name = sc->model; 263 mi->props = 0; 264 } 265 266 int 267 mpu_intr(addr) 268 void *addr; 269 { 270 struct mpu_softc *sc = addr; 271 272 if (MPU_GETSTATUS(sc->iot, sc->ioh) & MPU_INPUT_EMPTY) { 273 DPRINTF(("mpu_intr: no data\n")); 274 return (0); 275 } else { 276 mpu_readinput(sc); 277 return (1); 278 } 279 } 280