sound/pci/emu10k1/emumpu401.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   3  *  Routines for control of EMU10K1 MPU-401 in UART mode
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/time.h>
  23 #include <linux/init.h>
  24 #include <sound/core.h>
  25 #include <sound/emu10k1.h>
  26
  27 #define EMU10K1_MIDI_MODE_INPUT         (1<<0)
  28 #define EMU10K1_MIDI_MODE_OUTPUT        (1<<1)
  29
  30 static inline unsigned char mpu401_read(struct snd_emu10k1 *emu,
  31                                         struct snd_emu10k1_midi *mpu, int idx)
  32 {
  33         if (emu->audigy)
  34                 return (unsigned char)snd_emu10k1_ptr_read(emu, mpu->port + idx, 0);
  35         else
  36                 return inb(emu->port + mpu->port + idx);
  37 }
  38
  39 static inline void mpu401_write(struct snd_emu10k1 *emu,
  40                                 struct snd_emu10k1_midi *mpu, int data, int idx)
  41 {
  42         if (emu->audigy)
  43                 snd_emu10k1_ptr_write(emu, mpu->port + idx, 0, data);
  44         else
  45                 outb(data, emu->port + mpu->port + idx);
  46 }
  47
  48 #define mpu401_write_data(emu, mpu, data)       mpu401_write(emu, mpu, data, 0)
  49 #define mpu401_write_cmd(emu, mpu, data)        mpu401_write(emu, mpu, data, 1)
  50 #define mpu401_read_data(emu, mpu)              mpu401_read(emu, mpu, 0)
  51 #define mpu401_read_stat(emu, mpu)              mpu401_read(emu, mpu, 1)
  52
  53 #define mpu401_input_avail(emu,mpu)     (!(mpu401_read_stat(emu,mpu) & 0x80))
  54 #define mpu401_output_ready(emu,mpu)    (!(mpu401_read_stat(emu,mpu) & 0x40))
  55
  56 #define MPU401_RESET            0xff
  57 #define MPU401_ENTER_UART       0x3f
  58 #define MPU401_ACK              0xfe
  59
  60 static void mpu401_clear_rx(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *mpu)
  61 {
  62         int timeout = 100000;
  63         for (; timeout > 0 && mpu401_input_avail(emu, mpu); timeout--)
  64                 mpu401_read_data(emu, mpu);
  65 #ifdef CONFIG_SND_DEBUG
  66         if (timeout <= 0)
  67                 snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n", mpu401_read_stat(emu, mpu));
  68 #endif
  69 }
  70
  71 /*
  72
  73  */
  74
  75 static void do_emu10k1_midi_interrupt(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *midi, unsigned int status)
  76 {
  77         unsigned char byte;
  78
  79         if (midi->rmidi == NULL) {
  80                 snd_emu10k1_intr_disable(emu, midi->tx_enable | midi->rx_enable);
  81                 return;
  82         }
  83
  84         spin_lock(&midi->input_lock);
  85         if ((status & midi->ipr_rx) && mpu401_input_avail(emu, midi)) {
  86                 if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) {
  87                         mpu401_clear_rx(emu, midi);
  88                 } else {
  89                         byte = mpu401_read_data(emu, midi);
  90                         if (midi->substream_input)
  91                                 snd_rawmidi_receive(midi->substream_input, &byte, 1);
  92                 }
  93         }
  94         spin_unlock(&midi->input_lock);
  95
  96         spin_lock(&midi->output_lock);
  97         if ((status & midi->ipr_tx) && mpu401_output_ready(emu, midi)) {
  98                 if (midi->substream_output &&
  99                     snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
 100                         mpu401_write_data(emu, midi, byte);
 101                 } else {
 102                         snd_emu10k1_intr_disable(emu, midi->tx_enable);
 103                 }
 104         }
 105         spin_unlock(&midi->output_lock);
 106 }
 107
 108 static void snd_emu10k1_midi_interrupt(struct snd_emu10k1 *emu, unsigned int status)
 109 {
 110         do_emu10k1_midi_interrupt(emu, &emu->midi, status);
 111 }
 112
 113 static void snd_emu10k1_midi_interrupt2(struct snd_emu10k1 *emu, unsigned int status)
 114 {
 115         do_emu10k1_midi_interrupt(emu, &emu->midi2, status);
 116 }
 117
 118 static int snd_emu10k1_midi_cmd(struct snd_emu10k1 * emu, struct snd_emu10k1_midi *midi, unsigned char cmd, int ack)
 119 {
 120         unsigned long flags;
 121         int timeout, ok;
 122
 123         spin_lock_irqsave(&midi->input_lock, flags);
 124         mpu401_write_data(emu, midi, 0x00);
 125         /* mpu401_clear_rx(emu, midi); */
 126
 127         mpu401_write_cmd(emu, midi, cmd);
 128         if (ack) {
 129                 ok = 0;
 130                 timeout = 10000;
 131                 while (!ok && timeout-- > 0) {
 132                         if (mpu401_input_avail(emu, midi)) {
 133                                 if (mpu401_read_data(emu, midi) == MPU401_ACK)
 134                                         ok = 1;
 135                         }
 136                 }
 137                 if (!ok && mpu401_read_data(emu, midi) == MPU401_ACK)
 138                         ok = 1;
 139         } else {
 140                 ok = 1;
 141         }
 142         spin_unlock_irqrestore(&midi->input_lock, flags);
 143         if (!ok) {
 144                 snd_printk(KERN_ERR "midi_cmd: 0x%x failed at 0x%lx (status = 0x%x, data = 0x%x)!!!\n",
 145                            cmd, emu->port,
 146                            mpu401_read_stat(emu, midi),
 147                            mpu401_read_data(emu, midi));
 148                 return 1;
 149         }
 150         return 0;
 151 }
 152
 153 static int snd_emu10k1_midi_input_open(struct snd_rawmidi_substream *substream)
 154 {
 155         struct snd_emu10k1 *emu;
 156         struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
 157         unsigned long flags;
 158
 159         emu = midi->emu;
 160         snd_assert(emu, return -ENXIO);
 161         spin_lock_irqsave(&midi->open_lock, flags);
 162         midi->midi_mode |= EMU10K1_MIDI_MODE_INPUT;
 163         midi->substream_input = substream;
 164         if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT)) {
 165                 spin_unlock_irqrestore(&midi->open_lock, flags);
 166                 if (snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 1))
 167                         goto error_out;
 168                 if (snd_emu10k1_midi_cmd(emu, midi, MPU401_ENTER_UART, 1))
 169                         goto error_out;
 170         } else {
 171                 spin_unlock_irqrestore(&midi->open_lock, flags);
 172         }
 173         return 0;
 174
 175 error_out:
 176         return -EIO;
 177 }
 178
 179 static int snd_emu10k1_midi_output_open(struct snd_rawmidi_substream *substream)
 180 {
 181         struct snd_emu10k1 *emu;
 182         struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
 183         unsigned long flags;
 184
 185         emu = midi->emu;
 186         snd_assert(emu, return -ENXIO);
 187         spin_lock_irqsave(&midi->open_lock, flags);
 188         midi->midi_mode |= EMU10K1_MIDI_MODE_OUTPUT;
 189         midi->substream_output = substream;
 190         if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) {
 191                 spin_unlock_irqrestore(&midi->open_lock, flags);
 192                 if (snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 1))
 193                         goto error_out;
 194                 if (snd_emu10k1_midi_cmd(emu, midi, MPU401_ENTER_UART, 1))
 195                         goto error_out;
 196         } else {
 197                 spin_unlock_irqrestore(&midi->open_lock, flags);
 198         }
 199         return 0;
 200
 201 error_out:
 202         return -EIO;
 203 }
 204
 205 static int snd_emu10k1_midi_input_close(struct snd_rawmidi_substream *substream)
 206 {
 207         struct snd_emu10k1 *emu;
 208         struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
 209         unsigned long flags;
 210         int err = 0;
 211
 212         emu = midi->emu;
 213         snd_assert(emu, return -ENXIO);
 214         spin_lock_irqsave(&midi->open_lock, flags);
 215         snd_emu10k1_intr_disable(emu, midi->rx_enable);
 216         midi->midi_mode &= ~EMU10K1_MIDI_MODE_INPUT;
 217         midi->substream_input = NULL;
 218         if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT)) {
 219                 spin_unlock_irqrestore(&midi->open_lock, flags);
 220                 err = snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 0);
 221         } else {
 222                 spin_unlock_irqrestore(&midi->open_lock, flags);
 223         }
 224         return err;
 225 }
 226
 227 static int snd_emu10k1_midi_output_close(struct snd_rawmidi_substream *substream)
 228 {
 229         struct snd_emu10k1 *emu;
 230         struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
 231         unsigned long flags;
 232         int err = 0;
 233
 234         emu = midi->emu;
 235         snd_assert(emu, return -ENXIO);
 236         spin_lock_irqsave(&midi->open_lock, flags);
 237         snd_emu10k1_intr_disable(emu, midi->tx_enable);
 238         midi->midi_mode &= ~EMU10K1_MIDI_MODE_OUTPUT;
 239         midi->substream_output = NULL;
 240         if (!(midi->midi_mode & EMU10K1_MIDI_MODE_INPUT)) {
 241                 spin_unlock_irqrestore(&midi->open_lock, flags);
 242                 err = snd_emu10k1_midi_cmd(emu, midi, MPU401_RESET, 0);
 243         } else {
 244                 spin_unlock_irqrestore(&midi->open_lock, flags);
 245         }
 246         return err;
 247 }
 248
 249 static void snd_emu10k1_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 250 {
 251         struct snd_emu10k1 *emu;
 252         struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
 253         emu = midi->emu;
 254         snd_assert(emu, return);
 255
 256         if (up)
 257                 snd_emu10k1_intr_enable(emu, midi->rx_enable);
 258         else
 259                 snd_emu10k1_intr_disable(emu, midi->rx_enable);
 260 }
 261
 262 static void snd_emu10k1_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 263 {
 264         struct snd_emu10k1 *emu;
 265         struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)substream->rmidi->private_data;
 266         unsigned long flags;
 267
 268         emu = midi->emu;
 269         snd_assert(emu, return);
 270
 271         if (up) {
 272                 int max = 4;
 273                 unsigned char byte;
 274
 275                 /* try to send some amount of bytes here before interrupts */
 276                 spin_lock_irqsave(&midi->output_lock, flags);
 277                 while (max > 0) {
 278                         if (mpu401_output_ready(emu, midi)) {
 279                                 if (!(midi->midi_mode & EMU10K1_MIDI_MODE_OUTPUT) ||
 280                                     snd_rawmidi_transmit(substream, &byte, 1) != 1) {
 281                                         /* no more data */
 282                                         spin_unlock_irqrestore(&midi->output_lock, flags);
 283                                         return;
 284                                 }
 285                                 mpu401_write_data(emu, midi, byte);
 286                                 max--;
 287                         } else {
 288                                 break;
 289                         }
 290                 }
 291                 spin_unlock_irqrestore(&midi->output_lock, flags);
 292                 snd_emu10k1_intr_enable(emu, midi->tx_enable);
 293         } else {
 294                 snd_emu10k1_intr_disable(emu, midi->tx_enable);
 295         }
 296 }
 297
 298 /*
 299
 300  */
 301
 302 static struct snd_rawmidi_ops snd_emu10k1_midi_output =
 303 {
 304         .open =         snd_emu10k1_midi_output_open,
 305         .close =        snd_emu10k1_midi_output_close,
 306         .trigger =      snd_emu10k1_midi_output_trigger,
 307 };
 308
 309 static struct snd_rawmidi_ops snd_emu10k1_midi_input =
 310 {
 311         .open =         snd_emu10k1_midi_input_open,
 312         .close =        snd_emu10k1_midi_input_close,
 313         .trigger =      snd_emu10k1_midi_input_trigger,
 314 };
 315
 316 static void snd_emu10k1_midi_free(struct snd_rawmidi *rmidi)
 317 {
 318         struct snd_emu10k1_midi *midi = (struct snd_emu10k1_midi *)rmidi->private_data;
 319         midi->interrupt = NULL;
 320         midi->rmidi = NULL;
 321 }
 322
 323 static int __devinit emu10k1_midi_init(struct snd_emu10k1 *emu, struct snd_emu10k1_midi *midi, int device, char *name)
 324 {
 325         struct snd_rawmidi *rmidi;
 326         int err;
 327
 328         if ((err = snd_rawmidi_new(emu->card, name, device, 1, 1, &rmidi)) < 0)
 329                 return err;
 330         midi->emu = emu;
 331         spin_lock_init(&midi->open_lock);
 332         spin_lock_init(&midi->input_lock);
 333         spin_lock_init(&midi->output_lock);
 334         strcpy(rmidi->name, name);
 335         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_emu10k1_midi_output);
 336         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_emu10k1_midi_input);
 337         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
 338                              SNDRV_RAWMIDI_INFO_INPUT |
 339                              SNDRV_RAWMIDI_INFO_DUPLEX;
 340         rmidi->private_data = midi;
 341         rmidi->private_free = snd_emu10k1_midi_free;
 342         midi->rmidi = rmidi;
 343         return 0;
 344 }
 345
 346 int __devinit snd_emu10k1_midi(struct snd_emu10k1 *emu)
 347 {
 348         struct snd_emu10k1_midi *midi = &emu->midi;
 349         int err;
 350
 351         if ((err = emu10k1_midi_init(emu, midi, 0, "EMU10K1 MPU-401 (UART)")) < 0)
 352                 return err;
 353
 354         midi->tx_enable = INTE_MIDITXENABLE;
 355         midi->rx_enable = INTE_MIDIRXENABLE;
 356         midi->port = MUDATA;
 357         midi->ipr_tx = IPR_MIDITRANSBUFEMPTY;
 358         midi->ipr_rx = IPR_MIDIRECVBUFEMPTY;
 359         midi->interrupt = snd_emu10k1_midi_interrupt;
 360         return 0;
 361 }
 362
 363 int __devinit snd_emu10k1_audigy_midi(struct snd_emu10k1 *emu)
 364 {
 365         struct snd_emu10k1_midi *midi;
 366         int err;
 367
 368         midi = &emu->midi;
 369         if ((err = emu10k1_midi_init(emu, midi, 0, "Audigy MPU-401 (UART)")) < 0)
 370                 return err;
 371
 372         midi->tx_enable = INTE_MIDITXENABLE;
 373         midi->rx_enable = INTE_MIDIRXENABLE;
 374         midi->port = A_MUDATA1;
 375         midi->ipr_tx = IPR_MIDITRANSBUFEMPTY;
 376         midi->ipr_rx = IPR_MIDIRECVBUFEMPTY;
 377         midi->interrupt = snd_emu10k1_midi_interrupt;
 378
 379         midi = &emu->midi2;
 380         if ((err = emu10k1_midi_init(emu, midi, 1, "Audigy MPU-401 #2")) < 0)
 381                 return err;
 382
 383         midi->tx_enable = INTE_A_MIDITXENABLE2;
 384         midi->rx_enable = INTE_A_MIDIRXENABLE2;
 385         midi->port = A_MUDATA2;
 386         midi->ipr_tx = IPR_A_MIDITRANSBUFEMPTY2;
 387         midi->ipr_rx = IPR_A_MIDIRECVBUFEMPTY2;
 388         midi->interrupt = snd_emu10k1_midi_interrupt2;
 389         return 0;
 390 }