kernel/sound/isa/sb/emu8000_pcm.c

   1 /*
   2  * pcm emulation on emu8000 wavetable
   3  *
   4  *  Copyright (C) 2002 Takashi Iwai <tiwai@suse.de>
   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 #include "emu8000_local.h"
  22 #include <linux/init.h>
  23 #include <linux/slab.h>
  24 #include <sound/initval.h>
  25 #include <sound/pcm.h>
  26
  27 /*
  28  * define the following if you want to use this pcm with non-interleaved mode
  29  */
  30 /* #define USE_NONINTERLEAVE */
  31
  32 /* NOTE: for using the non-interleaved mode with alsa-lib, you have to set
  33  * mmap_emulation flag to 1 in your .asoundrc, such like
  34  *
  35  *      pcm.emu8k {
  36  *              type plug
  37  *              slave.pcm {
  38  *                      type hw
  39  *                      card 0
  40  *                      device 1
  41  *                      mmap_emulation 1
  42  *              }
  43  *      }
  44  *
  45  * besides, for the time being, the non-interleaved mode doesn't work well on
  46  * alsa-lib...
  47  */
  48
  49
  50 struct snd_emu8k_pcm {
  51         struct snd_emu8000 *emu;
  52         struct snd_pcm_substream *substream;
  53
  54         unsigned int allocated_bytes;
  55         struct snd_util_memblk *block;
  56         unsigned int offset;
  57         unsigned int buf_size;
  58         unsigned int period_size;
  59         unsigned int loop_start[2];
  60         unsigned int pitch;
  61         int panning[2];
  62         int last_ptr;
  63         int period_pos;
  64         int voices;
  65         unsigned int dram_opened: 1;
  66         unsigned int running: 1;
  67         unsigned int timer_running: 1;
  68         struct timer_list timer;
  69         spinlock_t timer_lock;
  70 };
  71
  72 #define LOOP_BLANK_SIZE         8
  73
  74
  75 /*
  76  * open up channels for the simultaneous data transfer and playback
  77  */
  78 static int
  79 emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels)
  80 {
  81         int i;
  82
  83         /* reserve up to 2 voices for playback */
  84         snd_emux_lock_voice(emu->emu, 0);
  85         if (channels > 1)
  86                 snd_emux_lock_voice(emu->emu, 1);
  87
  88         /* reserve 28 voices for loading */
  89         for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) {
  90                 unsigned int mode = EMU8000_RAM_WRITE;
  91                 snd_emux_lock_voice(emu->emu, i);
  92 #ifndef USE_NONINTERLEAVE
  93                 if (channels > 1 && (i & 1) != 0)
  94                         mode |= EMU8000_RAM_RIGHT;
  95 #endif
  96                 snd_emu8000_dma_chan(emu, i, mode);
  97         }
  98
  99         /* assign voice 31 and 32 to ROM */
 100         EMU8000_VTFT_WRITE(emu, 30, 0);
 101         EMU8000_PSST_WRITE(emu, 30, 0x1d8);
 102         EMU8000_CSL_WRITE(emu, 30, 0x1e0);
 103         EMU8000_CCCA_WRITE(emu, 30, 0x1d8);
 104         EMU8000_VTFT_WRITE(emu, 31, 0);
 105         EMU8000_PSST_WRITE(emu, 31, 0x1d8);
 106         EMU8000_CSL_WRITE(emu, 31, 0x1e0);
 107         EMU8000_CCCA_WRITE(emu, 31, 0x1d8);
 108
 109         return 0;
 110 }
 111
 112 /*
 113  */
 114 static void
 115 snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule)
 116 {
 117         while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
 118                 if (can_schedule) {
 119                         schedule_timeout_interruptible(1);
 120                         if (signal_pending(current))
 121                                 break;
 122                 }
 123         }
 124 }
 125
 126 /*
 127  * close all channels
 128  */
 129 static void
 130 emu8k_close_dram(struct snd_emu8000 *emu)
 131 {
 132         int i;
 133
 134         for (i = 0; i < 2; i++)
 135                 snd_emux_unlock_voice(emu->emu, i);
 136         for (; i < EMU8000_DRAM_VOICES; i++) {
 137                 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
 138                 snd_emux_unlock_voice(emu->emu, i);
 139         }
 140 }
 141
 142 /*
 143  * convert Hz to AWE32 rate offset (see emux/soundfont.c)
 144  */
 145
 146 #define OFFSET_SAMPLERATE       1011119         /* base = 44100 */
 147 #define SAMPLERATE_RATIO        4096
 148
 149 static int calc_rate_offset(int hz)
 150 {
 151         return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO);
 152 }
 153
 154
 155 /*
 156  */
 157
 158 static struct snd_pcm_hardware emu8k_pcm_hw = {
 159 #ifdef USE_NONINTERLEAVE
 160         .info =                 SNDRV_PCM_INFO_NONINTERLEAVED,
 161 #else
 162         .info =                 SNDRV_PCM_INFO_INTERLEAVED,
 163 #endif
 164         .formats =              SNDRV_PCM_FMTBIT_S16_LE,
 165         .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
 166         .rate_min =             4000,
 167         .rate_max =             48000,
 168         .channels_min =         1,
 169         .channels_max =         2,
 170         .buffer_bytes_max =     (128*1024),
 171         .period_bytes_min =     1024,
 172         .period_bytes_max =     (128*1024),
 173         .periods_min =          2,
 174         .periods_max =          1024,
 175         .fifo_size =            0,
 176
 177 };
 178
 179 /*
 180  * get the current position at the given channel from CCCA register
 181  */
 182 static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch)
 183 {
 184         int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff;
 185         val -= rec->loop_start[ch] - 1;
 186         return val;
 187 }
 188
 189
 190 /*
 191  * timer interrupt handler
 192  * check the current position and update the period if necessary.
 193  */
 194 static void emu8k_pcm_timer_func(unsigned long data)
 195 {
 196         struct snd_emu8k_pcm *rec = (struct snd_emu8k_pcm *)data;
 197         int ptr, delta;
 198
 199         spin_lock(&rec->timer_lock);
 200         /* update the current pointer */
 201         ptr = emu8k_get_curpos(rec, 0);
 202         if (ptr < rec->last_ptr)
 203                 delta = ptr + rec->buf_size - rec->last_ptr;
 204         else
 205                 delta = ptr - rec->last_ptr;
 206         rec->period_pos += delta;
 207         rec->last_ptr = ptr;
 208
 209         /* reprogram timer */
 210         mod_timer(&rec->timer, jiffies + 1);
 211
 212         /* update period */
 213         if (rec->period_pos >= (int)rec->period_size) {
 214                 rec->period_pos %= rec->period_size;
 215                 spin_unlock(&rec->timer_lock);
 216                 snd_pcm_period_elapsed(rec->substream);
 217                 return;
 218         }
 219         spin_unlock(&rec->timer_lock);
 220 }
 221
 222
 223 /*
 224  * open pcm
 225  * creating an instance here
 226  */
 227 static int emu8k_pcm_open(struct snd_pcm_substream *subs)
 228 {
 229         struct snd_emu8000 *emu = snd_pcm_substream_chip(subs);
 230         struct snd_emu8k_pcm *rec;
 231         struct snd_pcm_runtime *runtime = subs->runtime;
 232
 233         rec = kzalloc(sizeof(*rec), GFP_KERNEL);
 234         if (! rec)
 235                 return -ENOMEM;
 236
 237         rec->emu = emu;
 238         rec->substream = subs;
 239         runtime->private_data = rec;
 240
 241         spin_lock_init(&rec->timer_lock);
 242         setup_timer(&rec->timer, emu8k_pcm_timer_func, (unsigned long)rec);
 243
 244         runtime->hw = emu8k_pcm_hw;
 245         runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
 246         runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;
 247
 248         /* use timer to update periods.. (specified in msec) */
 249         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 250                                      (1000000 + HZ - 1) / HZ, UINT_MAX);
 251
 252         return 0;
 253 }
 254
 255 static int emu8k_pcm_close(struct snd_pcm_substream *subs)
 256 {
 257         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 258         kfree(rec);
 259         subs->runtime->private_data = NULL;
 260         return 0;
 261 }
 262
 263 /*
 264  * calculate pitch target
 265  */
 266 static int calc_pitch_target(int pitch)
 267 {
 268         int ptarget = 1 << (pitch >> 12);
 269         if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
 270         if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
 271         if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
 272         ptarget += (ptarget >> 1);
 273         if (ptarget > 0xffff) ptarget = 0xffff;
 274         return ptarget;
 275 }
 276
 277 /*
 278  * set up the voice
 279  */
 280 static void setup_voice(struct snd_emu8k_pcm *rec, int ch)
 281 {
 282         struct snd_emu8000 *hw = rec->emu;
 283         unsigned int temp;
 284
 285         /* channel to be silent and idle */
 286         EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
 287         EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
 288         EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
 289         EMU8000_PTRX_WRITE(hw, ch, 0);
 290         EMU8000_CPF_WRITE(hw, ch, 0);
 291
 292         /* pitch offset */
 293         EMU8000_IP_WRITE(hw, ch, rec->pitch);
 294         /* set envelope parameters */
 295         EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
 296         EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
 297         EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
 298         EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
 299         EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
 300         /* decay/sustain parameter for volume envelope is used
 301            for triggerg the voice */
 302         /* modulation envelope heights */
 303         EMU8000_PEFE_WRITE(hw, ch, 0x0);
 304         /* lfo1/2 delay */
 305         EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
 306         EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
 307         /* lfo1 pitch & cutoff shift */
 308         EMU8000_FMMOD_WRITE(hw, ch, 0);
 309         /* lfo1 volume & freq */
 310         EMU8000_TREMFRQ_WRITE(hw, ch, 0);
 311         /* lfo2 pitch & freq */
 312         EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
 313         /* pan & loop start */
 314         temp = rec->panning[ch];
 315         temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);
 316         EMU8000_PSST_WRITE(hw, ch, temp);
 317         /* chorus & loop end (chorus 8bit, MSB) */
 318         temp = 0; // chorus
 319         temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
 320         EMU8000_CSL_WRITE(hw, ch, temp);
 321         /* Q & current address (Q 4bit value, MSB) */
 322         temp = 0; // filterQ
 323         temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);
 324         EMU8000_CCCA_WRITE(hw, ch, temp);
 325         /* clear unknown registers */
 326         EMU8000_00A0_WRITE(hw, ch, 0);
 327         EMU8000_0080_WRITE(hw, ch, 0);
 328 }
 329
 330 /*
 331  * trigger the voice
 332  */
 333 static void start_voice(struct snd_emu8k_pcm *rec, int ch)
 334 {
 335         unsigned long flags;
 336         struct snd_emu8000 *hw = rec->emu;
 337         unsigned int temp, aux;
 338         int pt = calc_pitch_target(rec->pitch);
 339
 340         /* cutoff and volume */
 341         EMU8000_IFATN_WRITE(hw, ch, 0xff00);
 342         EMU8000_VTFT_WRITE(hw, ch, 0xffff);
 343         EMU8000_CVCF_WRITE(hw, ch, 0xffff);
 344         /* trigger envelope */
 345         EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
 346         /* set reverb and pitch target */
 347         temp = 0; // reverb
 348         if (rec->panning[ch] == 0)
 349                 aux = 0xff;
 350         else
 351                 aux = (-rec->panning[ch]) & 0xff;
 352         temp = (temp << 8) | (pt << 16) | aux;
 353         EMU8000_PTRX_WRITE(hw, ch, temp);
 354         EMU8000_CPF_WRITE(hw, ch, pt << 16);
 355
 356         /* start timer */
 357         spin_lock_irqsave(&rec->timer_lock, flags);
 358         if (! rec->timer_running) {
 359                 mod_timer(&rec->timer, jiffies + 1);
 360                 rec->timer_running = 1;
 361         }
 362         spin_unlock_irqrestore(&rec->timer_lock, flags);
 363 }
 364
 365 /*
 366  * stop the voice immediately
 367  */
 368 static void stop_voice(struct snd_emu8k_pcm *rec, int ch)
 369 {
 370         unsigned long flags;
 371         struct snd_emu8000 *hw = rec->emu;
 372
 373         EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
 374
 375         /* stop timer */
 376         spin_lock_irqsave(&rec->timer_lock, flags);
 377         if (rec->timer_running) {
 378                 del_timer(&rec->timer);
 379                 rec->timer_running = 0;
 380         }
 381         spin_unlock_irqrestore(&rec->timer_lock, flags);
 382 }
 383
 384 static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
 385 {
 386         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 387         int ch;
 388
 389         switch (cmd) {
 390         case SNDRV_PCM_TRIGGER_START:
 391                 for (ch = 0; ch < rec->voices; ch++)
 392                         start_voice(rec, ch);
 393                 rec->running = 1;
 394                 break;
 395         case SNDRV_PCM_TRIGGER_STOP:
 396                 rec->running = 0;
 397                 for (ch = 0; ch < rec->voices; ch++)
 398                         stop_voice(rec, ch);
 399                 break;
 400         default:
 401                 return -EINVAL;
 402         }
 403         return 0;
 404 }
 405
 406
 407 /*
 408  * copy / silence ops
 409  */
 410
 411 /*
 412  * this macro should be inserted in the copy/silence loops
 413  * to reduce the latency.  without this, the system will hang up
 414  * during the whole loop.
 415  */
 416 #define CHECK_SCHEDULER() \
 417 do { \
 418         cond_resched();\
 419         if (signal_pending(current))\
 420                 return -EAGAIN;\
 421 } while (0)
 422
 423
 424 #ifdef USE_NONINTERLEAVE
 425 /* copy one channel block */
 426 static int emu8k_transfer_block(struct snd_emu8000 *emu, int offset, unsigned short *buf, int count)
 427 {
 428         EMU8000_SMALW_WRITE(emu, offset);
 429         while (count > 0) {
 430                 unsigned short sval;
 431                 CHECK_SCHEDULER();
 432                 if (get_user(sval, buf))
 433                         return -EFAULT;
 434                 EMU8000_SMLD_WRITE(emu, sval);
 435                 buf++;
 436                 count--;
 437         }
 438         return 0;
 439 }
 440
 441 static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
 442                           int voice,
 443                           snd_pcm_uframes_t pos,
 444                           void *src,
 445                           snd_pcm_uframes_t count)
 446 {
 447         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 448         struct snd_emu8000 *emu = rec->emu;
 449
 450         snd_emu8000_write_wait(emu, 1);
 451         if (voice == -1) {
 452                 unsigned short *buf = src;
 453                 int i, err;
 454                 count /= rec->voices;
 455                 for (i = 0; i < rec->voices; i++) {
 456                         err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count);
 457                         if (err < 0)
 458                                 return err;
 459                         buf += count;
 460                 }
 461                 return 0;
 462         } else {
 463                 return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count);
 464         }
 465 }
 466
 467 /* make a channel block silence */
 468 static int emu8k_silence_block(struct snd_emu8000 *emu, int offset, int count)
 469 {
 470         EMU8000_SMALW_WRITE(emu, offset);
 471         while (count > 0) {
 472                 CHECK_SCHEDULER();
 473                 EMU8000_SMLD_WRITE(emu, 0);
 474                 count--;
 475         }
 476         return 0;
 477 }
 478
 479 static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
 480                              int voice,
 481                              snd_pcm_uframes_t pos,
 482                              snd_pcm_uframes_t count)
 483 {
 484         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 485         struct snd_emu8000 *emu = rec->emu;
 486
 487         snd_emu8000_write_wait(emu, 1);
 488         if (voice == -1 && rec->voices == 1)
 489                 voice = 0;
 490         if (voice == -1) {
 491                 int err;
 492                 err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2);
 493                 if (err < 0)
 494                         return err;
 495                 return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2);
 496         } else {
 497                 return emu8k_silence_block(emu, pos + rec->loop_start[voice], count);
 498         }
 499 }
 500
 501 #else /* interleave */
 502
 503 /*
 504  * copy the interleaved data can be done easily by using
 505  * DMA "left" and "right" channels on emu8k engine.
 506  */
 507 static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
 508                           int voice,
 509                           snd_pcm_uframes_t pos,
 510                           void __user *src,
 511                           snd_pcm_uframes_t count)
 512 {
 513         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 514         struct snd_emu8000 *emu = rec->emu;
 515         unsigned short __user *buf = src;
 516
 517         snd_emu8000_write_wait(emu, 1);
 518         EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]);
 519         if (rec->voices > 1)
 520                 EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]);
 521
 522         while (count-- > 0) {
 523                 unsigned short sval;
 524                 CHECK_SCHEDULER();
 525                 if (get_user(sval, buf))
 526                         return -EFAULT;
 527                 EMU8000_SMLD_WRITE(emu, sval);
 528                 buf++;
 529                 if (rec->voices > 1) {
 530                         CHECK_SCHEDULER();
 531                         if (get_user(sval, buf))
 532                                 return -EFAULT;
 533                         EMU8000_SMRD_WRITE(emu, sval);
 534                         buf++;
 535                 }
 536         }
 537         return 0;
 538 }
 539
 540 static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
 541                              int voice,
 542                              snd_pcm_uframes_t pos,
 543                              snd_pcm_uframes_t count)
 544 {
 545         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 546         struct snd_emu8000 *emu = rec->emu;
 547
 548         snd_emu8000_write_wait(emu, 1);
 549         EMU8000_SMALW_WRITE(emu, rec->loop_start[0] + pos);
 550         if (rec->voices > 1)
 551                 EMU8000_SMARW_WRITE(emu, rec->loop_start[1] + pos);
 552         while (count-- > 0) {
 553                 CHECK_SCHEDULER();
 554                 EMU8000_SMLD_WRITE(emu, 0);
 555                 if (rec->voices > 1) {
 556                         CHECK_SCHEDULER();
 557                         EMU8000_SMRD_WRITE(emu, 0);
 558                 }
 559         }
 560         return 0;
 561 }
 562 #endif
 563
 564
 565 /*
 566  * allocate a memory block
 567  */
 568 static int emu8k_pcm_hw_params(struct snd_pcm_substream *subs,
 569                                struct snd_pcm_hw_params *hw_params)
 570 {
 571         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 572
 573         if (rec->block) {
 574                 /* reallocation - release the old block */
 575                 snd_util_mem_free(rec->emu->memhdr, rec->block);
 576                 rec->block = NULL;
 577         }
 578
 579         rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4;
 580         rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes);
 581         if (! rec->block)
 582                 return -ENOMEM;
 583         rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */
 584         /* at least dma_bytes must be set for non-interleaved mode */
 585         subs->dma_buffer.bytes = params_buffer_bytes(hw_params);
 586
 587         return 0;
 588 }
 589
 590 /*
 591  * free the memory block
 592  */
 593 static int emu8k_pcm_hw_free(struct snd_pcm_substream *subs)
 594 {
 595         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 596
 597         if (rec->block) {
 598                 int ch;
 599                 for (ch = 0; ch < rec->voices; ch++)
 600                         stop_voice(rec, ch); // to be sure
 601                 if (rec->dram_opened)
 602                         emu8k_close_dram(rec->emu);
 603                 snd_util_mem_free(rec->emu->memhdr, rec->block);
 604                 rec->block = NULL;
 605         }
 606         return 0;
 607 }
 608
 609 /*
 610  */
 611 static int emu8k_pcm_prepare(struct snd_pcm_substream *subs)
 612 {
 613         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 614
 615         rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate);
 616         rec->last_ptr = 0;
 617         rec->period_pos = 0;
 618
 619         rec->buf_size = subs->runtime->buffer_size;
 620         rec->period_size = subs->runtime->period_size;
 621         rec->voices = subs->runtime->channels;
 622         rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE;
 623         if (rec->voices > 1)
 624                 rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE;
 625         if (rec->voices > 1) {
 626                 rec->panning[0] = 0xff;
 627                 rec->panning[1] = 0x00;
 628         } else
 629                 rec->panning[0] = 0x80;
 630
 631         if (! rec->dram_opened) {
 632                 int err, i, ch;
 633
 634                 snd_emux_terminate_all(rec->emu->emu);
 635                 if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0)
 636                         return err;
 637                 rec->dram_opened = 1;
 638
 639                 /* clear loop blanks */
 640                 snd_emu8000_write_wait(rec->emu, 0);
 641                 EMU8000_SMALW_WRITE(rec->emu, rec->offset);
 642                 for (i = 0; i < LOOP_BLANK_SIZE; i++)
 643                         EMU8000_SMLD_WRITE(rec->emu, 0);
 644                 for (ch = 0; ch < rec->voices; ch++) {
 645                         EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size);
 646                         for (i = 0; i < LOOP_BLANK_SIZE; i++)
 647                                 EMU8000_SMLD_WRITE(rec->emu, 0);
 648                 }
 649         }
 650
 651         setup_voice(rec, 0);
 652         if (rec->voices > 1)
 653                 setup_voice(rec, 1);
 654         return 0;
 655 }
 656
 657 static snd_pcm_uframes_t emu8k_pcm_pointer(struct snd_pcm_substream *subs)
 658 {
 659         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 660         if (rec->running)
 661                 return emu8k_get_curpos(rec, 0);
 662         return 0;
 663 }
 664
 665
 666 static struct snd_pcm_ops emu8k_pcm_ops = {
 667         .open =         emu8k_pcm_open,
 668         .close =        emu8k_pcm_close,
 669         .ioctl =        snd_pcm_lib_ioctl,
 670         .hw_params =    emu8k_pcm_hw_params,
 671         .hw_free =      emu8k_pcm_hw_free,
 672         .prepare =      emu8k_pcm_prepare,
 673         .trigger =      emu8k_pcm_trigger,
 674         .pointer =      emu8k_pcm_pointer,
 675         .copy =         emu8k_pcm_copy,
 676         .silence =      emu8k_pcm_silence,
 677 };
 678
 679
 680 static void snd_emu8000_pcm_free(struct snd_pcm *pcm)
 681 {
 682         struct snd_emu8000 *emu = pcm->private_data;
 683         emu->pcm = NULL;
 684 }
 685
 686 int snd_emu8000_pcm_new(struct snd_card *card, struct snd_emu8000 *emu, int index)
 687 {
 688         struct snd_pcm *pcm;
 689         int err;
 690
 691         if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0)
 692                 return err;
 693         pcm->private_data = emu;
 694         pcm->private_free = snd_emu8000_pcm_free;
 695         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops);
 696         emu->pcm = pcm;
 697
 698         snd_device_register(card, pcm);
 699
 700         return 0;
 701 }