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 <sound/initval.h>
  24 #include <sound/pcm.h>
  25
  26 /*
  27  * define the following if you want to use this pcm with non-interleaved mode
  28  */
  29 /* #define USE_NONINTERLEAVE */
  30
  31 /* NOTE: for using the non-interleaved mode with alsa-lib, you have to set
  32  * mmap_emulation flag to 1 in your .asoundrc, such like
  33  *
  34  *      pcm.emu8k {
  35  *              type plug
  36  *              slave.pcm {
  37  *                      type hw
  38  *                      card 0
  39  *                      device 1
  40  *                      mmap_emulation 1
  41  *              }
  42  *      }
  43  *
  44  * besides, for the time being, the non-interleaved mode doesn't work well on
  45  * alsa-lib...
  46  */
  47
  48
  49 typedef struct snd_emu8k_pcm emu8k_pcm_t;
  50
  51 struct snd_emu8k_pcm {
  52         emu8000_t *emu;
  53         snd_pcm_substream_t *substream;
  54
  55         unsigned int allocated_bytes;
  56         snd_util_memblk_t *block;
  57         unsigned int offset;
  58         unsigned int buf_size;
  59         unsigned int period_size;
  60         unsigned int loop_start[2];
  61         unsigned int pitch;
  62         int panning[2];
  63         int last_ptr;
  64         int period_pos;
  65         int voices;
  66         unsigned int dram_opened: 1;
  67         unsigned int running: 1;
  68         unsigned int timer_running: 1;
  69         struct timer_list timer;
  70         spinlock_t timer_lock;
  71 };
  72
  73 #define LOOP_BLANK_SIZE         8
  74
  75
  76 /*
  77  * open up channels for the simultaneous data transfer and playback
  78  */
  79 static int
  80 emu8k_open_dram_for_pcm(emu8000_t *emu, int channels)
  81 {
  82         int i;
  83
  84         /* reserve up to 2 voices for playback */
  85         snd_emux_lock_voice(emu->emu, 0);
  86         if (channels > 1)
  87                 snd_emux_lock_voice(emu->emu, 1);
  88
  89         /* reserve 28 voices for loading */
  90         for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) {
  91                 unsigned int mode = EMU8000_RAM_WRITE;
  92                 snd_emux_lock_voice(emu->emu, i);
  93 #ifndef USE_NONINTERLEAVE
  94                 if (channels > 1 && (i & 1) != 0)
  95                         mode |= EMU8000_RAM_RIGHT;
  96 #endif
  97                 snd_emu8000_dma_chan(emu, i, mode);
  98         }
  99
 100         /* assign voice 31 and 32 to ROM */
 101         EMU8000_VTFT_WRITE(emu, 30, 0);
 102         EMU8000_PSST_WRITE(emu, 30, 0x1d8);
 103         EMU8000_CSL_WRITE(emu, 30, 0x1e0);
 104         EMU8000_CCCA_WRITE(emu, 30, 0x1d8);
 105         EMU8000_VTFT_WRITE(emu, 31, 0);
 106         EMU8000_PSST_WRITE(emu, 31, 0x1d8);
 107         EMU8000_CSL_WRITE(emu, 31, 0x1e0);
 108         EMU8000_CCCA_WRITE(emu, 31, 0x1d8);
 109
 110         return 0;
 111 }
 112
 113 /*
 114  */
 115 static void
 116 snd_emu8000_write_wait(emu8000_t *emu, int can_schedule)
 117 {
 118         while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
 119                 if (can_schedule) {
 120                         schedule_timeout_interruptible(1);
 121                         if (signal_pending(current))
 122                                 break;
 123                 }
 124         }
 125 }
 126
 127 /*
 128  * close all channels
 129  */
 130 static void
 131 emu8k_close_dram(emu8000_t *emu)
 132 {
 133         int i;
 134
 135         for (i = 0; i < 2; i++)
 136                 snd_emux_unlock_voice(emu->emu, i);
 137         for (; i < EMU8000_DRAM_VOICES; i++) {
 138                 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
 139                 snd_emux_unlock_voice(emu->emu, i);
 140         }
 141 }
 142
 143 /*
 144  * convert Hz to AWE32 rate offset (see emux/soundfont.c)
 145  */
 146
 147 #define OFFSET_SAMPLERATE       1011119         /* base = 44100 */
 148 #define SAMPLERATE_RATIO        4096
 149
 150 static int calc_rate_offset(int hz)
 151 {
 152         return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO);
 153 }
 154
 155
 156 /*
 157  */
 158
 159 static snd_pcm_hardware_t emu8k_pcm_hw = {
 160 #ifdef USE_NONINTERLEAVE
 161         .info =                 SNDRV_PCM_INFO_NONINTERLEAVED,
 162 #else
 163         .info =                 SNDRV_PCM_INFO_INTERLEAVED,
 164 #endif
 165         .formats =              SNDRV_PCM_FMTBIT_S16_LE,
 166         .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
 167         .rate_min =             4000,
 168         .rate_max =             48000,
 169         .channels_min =         1,
 170         .channels_max =         2,
 171         .buffer_bytes_max =     (128*1024),
 172         .period_bytes_min =     1024,
 173         .period_bytes_max =     (128*1024),
 174         .periods_min =          2,
 175         .periods_max =          1024,
 176         .fifo_size =            0,
 177
 178 };
 179
 180 /*
 181  * get the current position at the given channel from CCCA register
 182  */
 183 static inline int emu8k_get_curpos(emu8k_pcm_t *rec, int ch)
 184 {
 185         int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff;
 186         val -= rec->loop_start[ch] - 1;
 187         return val;
 188 }
 189
 190
 191 /*
 192  * timer interrupt handler
 193  * check the current position and update the period if necessary.
 194  */
 195 static void emu8k_pcm_timer_func(unsigned long data)
 196 {
 197         emu8k_pcm_t *rec = (emu8k_pcm_t *)data;
 198         int ptr, delta;
 199
 200         spin_lock(&rec->timer_lock);
 201         /* update the current pointer */
 202         ptr = emu8k_get_curpos(rec, 0);
 203         if (ptr < rec->last_ptr)
 204                 delta = ptr + rec->buf_size - rec->last_ptr;
 205         else
 206                 delta = ptr - rec->last_ptr;
 207         rec->period_pos += delta;
 208         rec->last_ptr = ptr;
 209
 210         /* reprogram timer */
 211         rec->timer.expires = jiffies + 1;
 212         add_timer(&rec->timer);
 213
 214         /* update period */
 215         if (rec->period_pos >= (int)rec->period_size) {
 216                 rec->period_pos %= rec->period_size;
 217                 spin_unlock(&rec->timer_lock);
 218                 snd_pcm_period_elapsed(rec->substream);
 219                 return;
 220         }
 221         spin_unlock(&rec->timer_lock);
 222 }
 223
 224
 225 /*
 226  * open pcm
 227  * creating an instance here
 228  */
 229 static int emu8k_pcm_open(snd_pcm_substream_t *subs)
 230 {
 231         emu8000_t *emu = snd_pcm_substream_chip(subs);
 232         emu8k_pcm_t *rec;
 233         snd_pcm_runtime_t *runtime = subs->runtime;
 234
 235         rec = kzalloc(sizeof(*rec), GFP_KERNEL);
 236         if (! rec)
 237                 return -ENOMEM;
 238
 239         rec->emu = emu;
 240         rec->substream = subs;
 241         runtime->private_data = rec;
 242
 243         spin_lock_init(&rec->timer_lock);
 244         init_timer(&rec->timer);
 245         rec->timer.function = emu8k_pcm_timer_func;
 246         rec->timer.data = (unsigned long)rec;
 247
 248         runtime->hw = emu8k_pcm_hw;
 249         runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
 250         runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;
 251
 252         /* use timer to update periods.. (specified in msec) */
 253         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 254                                      (1000000 + HZ - 1) / HZ, UINT_MAX);
 255
 256         return 0;
 257 }
 258
 259 static int emu8k_pcm_close(snd_pcm_substream_t *subs)
 260 {
 261         emu8k_pcm_t *rec = subs->runtime->private_data;
 262         kfree(rec);
 263         subs->runtime->private_data = NULL;
 264         return 0;
 265 }
 266
 267 /*
 268  * calculate pitch target
 269  */
 270 static int calc_pitch_target(int pitch)
 271 {
 272         int ptarget = 1 << (pitch >> 12);
 273         if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
 274         if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
 275         if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
 276         ptarget += (ptarget >> 1);
 277         if (ptarget > 0xffff) ptarget = 0xffff;
 278         return ptarget;
 279 }
 280
 281 /*
 282  * set up the voice
 283  */
 284 static void setup_voice(emu8k_pcm_t *rec, int ch)
 285 {
 286         emu8000_t *hw = rec->emu;
 287         unsigned int temp;
 288
 289         /* channel to be silent and idle */
 290         EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
 291         EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
 292         EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
 293         EMU8000_PTRX_WRITE(hw, ch, 0);
 294         EMU8000_CPF_WRITE(hw, ch, 0);
 295
 296         /* pitch offset */
 297         EMU8000_IP_WRITE(hw, ch, rec->pitch);
 298         /* set envelope parameters */
 299         EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
 300         EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
 301         EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
 302         EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
 303         EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
 304         /* decay/sustain parameter for volume envelope is used
 305            for triggerg the voice */
 306         /* modulation envelope heights */
 307         EMU8000_PEFE_WRITE(hw, ch, 0x0);
 308         /* lfo1/2 delay */
 309         EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
 310         EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
 311         /* lfo1 pitch & cutoff shift */
 312         EMU8000_FMMOD_WRITE(hw, ch, 0);
 313         /* lfo1 volume & freq */
 314         EMU8000_TREMFRQ_WRITE(hw, ch, 0);
 315         /* lfo2 pitch & freq */
 316         EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
 317         /* pan & loop start */
 318         temp = rec->panning[ch];
 319         temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);
 320         EMU8000_PSST_WRITE(hw, ch, temp);
 321         /* chorus & loop end (chorus 8bit, MSB) */
 322         temp = 0; // chorus
 323         temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
 324         EMU8000_CSL_WRITE(hw, ch, temp);
 325         /* Q & current address (Q 4bit value, MSB) */
 326         temp = 0; // filterQ
 327         temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);
 328         EMU8000_CCCA_WRITE(hw, ch, temp);
 329         /* clear unknown registers */
 330         EMU8000_00A0_WRITE(hw, ch, 0);
 331         EMU8000_0080_WRITE(hw, ch, 0);
 332 }
 333
 334 /*
 335  * trigger the voice
 336  */
 337 static void start_voice(emu8k_pcm_t *rec, int ch)
 338 {
 339         unsigned long flags;
 340         emu8000_t *hw = rec->emu;
 341         unsigned int temp, aux;
 342         int pt = calc_pitch_target(rec->pitch);
 343
 344         /* cutoff and volume */
 345         EMU8000_IFATN_WRITE(hw, ch, 0xff00);
 346         EMU8000_VTFT_WRITE(hw, ch, 0xffff);
 347         EMU8000_CVCF_WRITE(hw, ch, 0xffff);
 348         /* trigger envelope */
 349         EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
 350         /* set reverb and pitch target */
 351         temp = 0; // reverb
 352         if (rec->panning[ch] == 0)
 353                 aux = 0xff;
 354         else
 355                 aux = (-rec->panning[ch]) & 0xff;
 356         temp = (temp << 8) | (pt << 16) | aux;
 357         EMU8000_PTRX_WRITE(hw, ch, temp);
 358         EMU8000_CPF_WRITE(hw, ch, pt << 16);
 359
 360         /* start timer */
 361         spin_lock_irqsave(&rec->timer_lock, flags);
 362         if (! rec->timer_running) {
 363                 rec->timer.expires = jiffies + 1;
 364                 add_timer(&rec->timer);
 365                 rec->timer_running = 1;
 366         }
 367         spin_unlock_irqrestore(&rec->timer_lock, flags);
 368 }
 369
 370 /*
 371  * stop the voice immediately
 372  */
 373 static void stop_voice(emu8k_pcm_t *rec, int ch)
 374 {
 375         unsigned long flags;
 376         emu8000_t *hw = rec->emu;
 377
 378         EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
 379
 380         /* stop timer */
 381         spin_lock_irqsave(&rec->timer_lock, flags);
 382         if (rec->timer_running) {
 383                 del_timer(&rec->timer);
 384                 rec->timer_running = 0;
 385         }
 386         spin_unlock_irqrestore(&rec->timer_lock, flags);
 387 }
 388
 389 static int emu8k_pcm_trigger(snd_pcm_substream_t *subs, int cmd)
 390 {
 391         emu8k_pcm_t *rec = subs->runtime->private_data;
 392         int ch;
 393
 394         switch (cmd) {
 395         case SNDRV_PCM_TRIGGER_START:
 396                 for (ch = 0; ch < rec->voices; ch++)
 397                         start_voice(rec, ch);
 398                 rec->running = 1;
 399                 break;
 400         case SNDRV_PCM_TRIGGER_STOP:
 401                 rec->running = 0;
 402                 for (ch = 0; ch < rec->voices; ch++)
 403                         stop_voice(rec, ch);
 404                 break;
 405         default:
 406                 return -EINVAL;
 407         }
 408         return 0;
 409 }
 410
 411
 412 /*
 413  * copy / silence ops
 414  */
 415
 416 /*
 417  * this macro should be inserted in the copy/silence loops
 418  * to reduce the latency.  without this, the system will hang up
 419  * during the whole loop.
 420  */
 421 #define CHECK_SCHEDULER() \
 422 do { \
 423         cond_resched();\
 424         if (signal_pending(current))\
 425                 return -EAGAIN;\
 426 } while (0)
 427
 428
 429 #ifdef USE_NONINTERLEAVE
 430 /* copy one channel block */
 431 static int emu8k_transfer_block(emu8000_t *emu, int offset, unsigned short *buf, int count)
 432 {
 433         EMU8000_SMALW_WRITE(emu, offset);
 434         while (count > 0) {
 435                 unsigned short sval;
 436                 CHECK_SCHEDULER();
 437                 get_user(sval, buf);
 438                 EMU8000_SMLD_WRITE(emu, sval);
 439                 buf++;
 440                 count--;
 441         }
 442         return 0;
 443 }
 444
 445 static int emu8k_pcm_copy(snd_pcm_substream_t *subs,
 446                           int voice,
 447                           snd_pcm_uframes_t pos,
 448                           void *src,
 449                           snd_pcm_uframes_t count)
 450 {
 451         emu8k_pcm_t *rec = subs->runtime->private_data;
 452         emu8000_t *emu = rec->emu;
 453
 454         snd_emu8000_write_wait(emu, 1);
 455         if (voice == -1) {
 456                 unsigned short *buf = src;
 457                 int i, err;
 458                 count /= rec->voices;
 459                 for (i = 0; i < rec->voices; i++) {
 460                         err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count);
 461                         if (err < 0)
 462                                 return err;
 463                         buf += count;
 464                 }
 465                 return 0;
 466         } else {
 467                 return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count);
 468         }
 469 }
 470
 471 /* make a channel block silence */
 472 static int emu8k_silence_block(emu8000_t *emu, int offset, int count)
 473 {
 474         EMU8000_SMALW_WRITE(emu, offset);
 475         while (count > 0) {
 476                 CHECK_SCHEDULER();
 477                 EMU8000_SMLD_WRITE(emu, 0);
 478                 count--;
 479         }
 480         return 0;
 481 }
 482
 483 static int emu8k_pcm_silence(snd_pcm_substream_t *subs,
 484                              int voice,
 485                              snd_pcm_uframes_t pos,
 486                              snd_pcm_uframes_t count)
 487 {
 488         emu8k_pcm_t *rec = subs->runtime->private_data;
 489         emu8000_t *emu = rec->emu;
 490
 491         snd_emu8000_write_wait(emu, 1);
 492         if (voice == -1 && rec->voices == 1)
 493                 voice = 0;
 494         if (voice == -1) {
 495                 int err;
 496                 err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2);
 497                 if (err < 0)
 498                         return err;
 499                 return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2);
 500         } else {
 501                 return emu8k_silence_block(emu, pos + rec->loop_start[voice], count);
 502         }
 503 }
 504
 505 #else /* interleave */
 506
 507 /*
 508  * copy the interleaved data can be done easily by using
 509  * DMA "left" and "right" channels on emu8k engine.
 510  */
 511 static int emu8k_pcm_copy(snd_pcm_substream_t *subs,
 512                           int voice,
 513                           snd_pcm_uframes_t pos,
 514                           void __user *src,
 515                           snd_pcm_uframes_t count)
 516 {
 517         emu8k_pcm_t *rec = subs->runtime->private_data;
 518         emu8000_t *emu = rec->emu;
 519         unsigned short __user *buf = src;
 520
 521         snd_emu8000_write_wait(emu, 1);
 522         EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]);
 523         if (rec->voices > 1)
 524                 EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]);
 525
 526         while (count-- > 0) {
 527                 unsigned short sval;
 528                 CHECK_SCHEDULER();
 529                 get_user(sval, buf);
 530                 EMU8000_SMLD_WRITE(emu, sval);
 531                 buf++;
 532                 if (rec->voices > 1) {
 533                         CHECK_SCHEDULER();
 534                         get_user(sval, buf);
 535                         EMU8000_SMRD_WRITE(emu, sval);
 536                         buf++;
 537                 }
 538         }
 539         return 0;
 540 }
 541
 542 static int emu8k_pcm_silence(snd_pcm_substream_t *subs,
 543                              int voice,
 544                              snd_pcm_uframes_t pos,
 545                              snd_pcm_uframes_t count)
 546 {
 547         emu8k_pcm_t *rec = subs->runtime->private_data;
 548         emu8000_t *emu = rec->emu;
 549
 550         snd_emu8000_write_wait(emu, 1);
 551         EMU8000_SMALW_WRITE(emu, rec->loop_start[0] + pos);
 552         if (rec->voices > 1)
 553                 EMU8000_SMARW_WRITE(emu, rec->loop_start[1] + pos);
 554         while (count-- > 0) {
 555                 CHECK_SCHEDULER();
 556                 EMU8000_SMLD_WRITE(emu, 0);
 557                 if (rec->voices > 1) {
 558                         CHECK_SCHEDULER();
 559                         EMU8000_SMRD_WRITE(emu, 0);
 560                 }
 561         }
 562         return 0;
 563 }
 564 #endif
 565
 566
 567 /*
 568  * allocate a memory block
 569  */
 570 static int emu8k_pcm_hw_params(snd_pcm_substream_t *subs,
 571                                snd_pcm_hw_params_t *hw_params)
 572 {
 573         emu8k_pcm_t *rec = subs->runtime->private_data;
 574
 575         if (rec->block) {
 576                 /* reallocation - release the old block */
 577                 snd_util_mem_free(rec->emu->memhdr, rec->block);
 578                 rec->block = NULL;
 579         }
 580
 581         rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4;
 582         rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes);
 583         if (! rec->block)
 584                 return -ENOMEM;
 585         rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */
 586         /* at least dma_bytes must be set for non-interleaved mode */
 587         subs->dma_buffer.bytes = params_buffer_bytes(hw_params);
 588
 589         return 0;
 590 }
 591
 592 /*
 593  * free the memory block
 594  */
 595 static int emu8k_pcm_hw_free(snd_pcm_substream_t *subs)
 596 {
 597         emu8k_pcm_t *rec = subs->runtime->private_data;
 598
 599         if (rec->block) {
 600                 int ch;
 601                 for (ch = 0; ch < rec->voices; ch++)
 602                         stop_voice(rec, ch); // to be sure
 603                 if (rec->dram_opened)
 604                         emu8k_close_dram(rec->emu);
 605                 snd_util_mem_free(rec->emu->memhdr, rec->block);
 606                 rec->block = NULL;
 607         }
 608         return 0;
 609 }
 610
 611 /*
 612  */
 613 static int emu8k_pcm_prepare(snd_pcm_substream_t *subs)
 614 {
 615         emu8k_pcm_t *rec = subs->runtime->private_data;
 616
 617         rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate);
 618         rec->last_ptr = 0;
 619         rec->period_pos = 0;
 620
 621         rec->buf_size = subs->runtime->buffer_size;
 622         rec->period_size = subs->runtime->period_size;
 623         rec->voices = subs->runtime->channels;
 624         rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE;
 625         if (rec->voices > 1)
 626                 rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE;
 627         if (rec->voices > 1) {
 628                 rec->panning[0] = 0xff;
 629                 rec->panning[1] = 0x00;
 630         } else
 631                 rec->panning[0] = 0x80;
 632
 633         if (! rec->dram_opened) {
 634                 int err, i, ch;
 635
 636                 snd_emux_terminate_all(rec->emu->emu);
 637                 if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0)
 638                         return err;
 639                 rec->dram_opened = 1;
 640
 641                 /* clear loop blanks */
 642                 snd_emu8000_write_wait(rec->emu, 0);
 643                 EMU8000_SMALW_WRITE(rec->emu, rec->offset);
 644                 for (i = 0; i < LOOP_BLANK_SIZE; i++)
 645                         EMU8000_SMLD_WRITE(rec->emu, 0);
 646                 for (ch = 0; ch < rec->voices; ch++) {
 647                         EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size);
 648                         for (i = 0; i < LOOP_BLANK_SIZE; i++)
 649                                 EMU8000_SMLD_WRITE(rec->emu, 0);
 650                 }
 651         }
 652
 653         setup_voice(rec, 0);
 654         if (rec->voices > 1)
 655                 setup_voice(rec, 1);
 656         return 0;
 657 }
 658
 659 static snd_pcm_uframes_t emu8k_pcm_pointer(snd_pcm_substream_t *subs)
 660 {
 661         emu8k_pcm_t *rec = subs->runtime->private_data;
 662         if (rec->running)
 663                 return emu8k_get_curpos(rec, 0);
 664         return 0;
 665 }
 666
 667
 668 static snd_pcm_ops_t emu8k_pcm_ops = {
 669         .open =         emu8k_pcm_open,
 670         .close =        emu8k_pcm_close,
 671         .ioctl =        snd_pcm_lib_ioctl,
 672         .hw_params =    emu8k_pcm_hw_params,
 673         .hw_free =      emu8k_pcm_hw_free,
 674         .prepare =      emu8k_pcm_prepare,
 675         .trigger =      emu8k_pcm_trigger,
 676         .pointer =      emu8k_pcm_pointer,
 677         .copy =         emu8k_pcm_copy,
 678         .silence =      emu8k_pcm_silence,
 679 };
 680
 681
 682 static void snd_emu8000_pcm_free(snd_pcm_t *pcm)
 683 {
 684         emu8000_t *emu = pcm->private_data;
 685         emu->pcm = NULL;
 686 }
 687
 688 int snd_emu8000_pcm_new(snd_card_t *card, emu8000_t *emu, int index)
 689 {
 690         snd_pcm_t *pcm;
 691         int err;
 692
 693         if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0)
 694                 return err;
 695         pcm->private_data = emu;
 696         pcm->private_free = snd_emu8000_pcm_free;
 697         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops);
 698         emu->pcm = pcm;
 699
 700         snd_device_register(card, pcm);
 701
 702         return 0;
 703 }