git.oblomov.eu Git - linux-2.6/blob - 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                         set_current_state(TASK_INTERRUPTIBLE);
 121                         schedule_timeout(1);
 122                         if (signal_pending(current))
 123                                 break;
 124                 }
 125         }
 126 }
 127
 128 /*
 129  * close all channels
 130  */
 131 static void
 132 emu8k_close_dram(emu8000_t *emu)
 133 {
 134         int i;
 135
 136         for (i = 0; i < 2; i++)
 137                 snd_emux_unlock_voice(emu->emu, i);
 138         for (; i < EMU8000_DRAM_VOICES; i++) {
 139                 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
 140                 snd_emux_unlock_voice(emu->emu, i);
 141         }
 142 }
 143
 144 /*
 145  * convert Hz to AWE32 rate offset (see emux/soundfont.c)
 146  */
 147
 148 #define OFFSET_SAMPLERATE       1011119         /* base = 44100 */
 149 #define SAMPLERATE_RATIO        4096
 150
 151 static int calc_rate_offset(int hz)
 152 {
 153         return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO);
 154 }
 155
 156
 157 /*
 158  */
 159
 160 static snd_pcm_hardware_t emu8k_pcm_hw = {
 161 #ifdef USE_NONINTERLEAVE
 162         .info =                 SNDRV_PCM_INFO_NONINTERLEAVED,
 163 #else
 164         .info =                 SNDRV_PCM_INFO_INTERLEAVED,
 165 #endif
 166         .formats =              SNDRV_PCM_FMTBIT_S16_LE,
 167         .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
 168         .rate_min =             4000,
 169         .rate_max =             48000,
 170         .channels_min =         1,
 171         .channels_max =         2,
 172         .buffer_bytes_max =     (128*1024),
 173         .period_bytes_min =     1024,
 174         .period_bytes_max =     (128*1024),
 175         .periods_min =          2,
 176         .periods_max =          1024,
 177         .fifo_size =            0,
 178
 179 };
 180
 181 /*
 182  * get the current position at the given channel from CCCA register
 183  */
 184 static inline int emu8k_get_curpos(emu8k_pcm_t *rec, int ch)
 185 {
 186         int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff;
 187         val -= rec->loop_start[ch] - 1;
 188         return val;
 189 }
 190
 191
 192 /*
 193  * timer interrupt handler
 194  * check the current position and update the period if necessary.
 195  */
 196 static void emu8k_pcm_timer_func(unsigned long data)
 197 {
 198         emu8k_pcm_t *rec = (emu8k_pcm_t *)data;
 199         int ptr, delta;
 200
 201         spin_lock(&rec->timer_lock);
 202         /* update the current pointer */
 203         ptr = emu8k_get_curpos(rec, 0);
 204         if (ptr < rec->last_ptr)
 205                 delta = ptr + rec->buf_size - rec->last_ptr;
 206         else
 207                 delta = ptr - rec->last_ptr;
 208         rec->period_pos += delta;
 209         rec->last_ptr = ptr;
 210
 211         /* reprogram timer */
 212         rec->timer.expires = jiffies + 1;
 213         add_timer(&rec->timer);
 214
 215         /* update period */
 216         if (rec->period_pos >= (int)rec->period_size) {
 217                 rec->period_pos %= rec->period_size;
 218                 spin_unlock(&rec->timer_lock);
 219                 snd_pcm_period_elapsed(rec->substream);
 220                 return;
 221         }
 222         spin_unlock(&rec->timer_lock);
 223 }
 224
 225
 226 /*
 227  * open pcm
 228  * creating an instance here
 229  */
 230 static int emu8k_pcm_open(snd_pcm_substream_t *subs)
 231 {
 232         emu8000_t *emu = snd_pcm_substream_chip(subs);
 233         emu8k_pcm_t *rec;
 234         snd_pcm_runtime_t *runtime = subs->runtime;
 235
 236         rec = kzalloc(sizeof(*rec), GFP_KERNEL);
 237         if (! rec)
 238                 return -ENOMEM;
 239
 240         rec->emu = emu;
 241         rec->substream = subs;
 242         runtime->private_data = rec;
 243
 244         spin_lock_init(&rec->timer_lock);
 245         init_timer(&rec->timer);
 246         rec->timer.function = emu8k_pcm_timer_func;
 247         rec->timer.data = (unsigned long)rec;
 248
 249         runtime->hw = emu8k_pcm_hw;
 250         runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
 251         runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;
 252
 253         /* use timer to update periods.. (specified in msec) */
 254         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 255                                      (1000000 + HZ - 1) / HZ, UINT_MAX);
 256
 257         return 0;
 258 }
 259
 260 static int emu8k_pcm_close(snd_pcm_substream_t *subs)
 261 {
 262         emu8k_pcm_t *rec = subs->runtime->private_data;
 263         kfree(rec);
 264         subs->runtime->private_data = NULL;
 265         return 0;
 266 }
 267
 268 /*
 269  * calculate pitch target
 270  */
 271 static int calc_pitch_target(int pitch)
 272 {
 273         int ptarget = 1 << (pitch >> 12);
 274         if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
 275         if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
 276         if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
 277         ptarget += (ptarget >> 1);
 278         if (ptarget > 0xffff) ptarget = 0xffff;
 279         return ptarget;
 280 }
 281
 282 /*
 283  * set up the voice
 284  */
 285 static void setup_voice(emu8k_pcm_t *rec, int ch)
 286 {
 287         emu8000_t *hw = rec->emu;
 288         unsigned int temp;
 289
 290         /* channel to be silent and idle */
 291         EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
 292         EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
 293         EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
 294         EMU8000_PTRX_WRITE(hw, ch, 0);
 295         EMU8000_CPF_WRITE(hw, ch, 0);
 296
 297         /* pitch offset */
 298         EMU8000_IP_WRITE(hw, ch, rec->pitch);
 299         /* set envelope parameters */
 300         EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
 301         EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
 302         EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
 303         EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
 304         EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
 305         /* decay/sustain parameter for volume envelope is used
 306            for triggerg the voice */
 307         /* modulation envelope heights */
 308         EMU8000_PEFE_WRITE(hw, ch, 0x0);
 309         /* lfo1/2 delay */
 310         EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
 311         EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
 312         /* lfo1 pitch & cutoff shift */
 313         EMU8000_FMMOD_WRITE(hw, ch, 0);
 314         /* lfo1 volume & freq */
 315         EMU8000_TREMFRQ_WRITE(hw, ch, 0);
 316         /* lfo2 pitch & freq */
 317         EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
 318         /* pan & loop start */
 319         temp = rec->panning[ch];
 320         temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);
 321         EMU8000_PSST_WRITE(hw, ch, temp);
 322         /* chorus & loop end (chorus 8bit, MSB) */
 323         temp = 0; // chorus
 324         temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
 325         EMU8000_CSL_WRITE(hw, ch, temp);
 326         /* Q & current address (Q 4bit value, MSB) */
 327         temp = 0; // filterQ
 328         temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);
 329         EMU8000_CCCA_WRITE(hw, ch, temp);
 330         /* clear unknown registers */
 331         EMU8000_00A0_WRITE(hw, ch, 0);
 332         EMU8000_0080_WRITE(hw, ch, 0);
 333 }
 334
 335 /*
 336  * trigger the voice
 337  */
 338 static void start_voice(emu8k_pcm_t *rec, int ch)
 339 {
 340         unsigned long flags;
 341         emu8000_t *hw = rec->emu;
 342         unsigned int temp, aux;
 343         int pt = calc_pitch_target(rec->pitch);
 344
 345         /* cutoff and volume */
 346         EMU8000_IFATN_WRITE(hw, ch, 0xff00);
 347         EMU8000_VTFT_WRITE(hw, ch, 0xffff);
 348         EMU8000_CVCF_WRITE(hw, ch, 0xffff);
 349         /* trigger envelope */
 350         EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
 351         /* set reverb and pitch target */
 352         temp = 0; // reverb
 353         if (rec->panning[ch] == 0)
 354                 aux = 0xff;
 355         else
 356                 aux = (-rec->panning[ch]) & 0xff;
 357         temp = (temp << 8) | (pt << 16) | aux;
 358         EMU8000_PTRX_WRITE(hw, ch, temp);
 359         EMU8000_CPF_WRITE(hw, ch, pt << 16);
 360
 361         /* start timer */
 362         spin_lock_irqsave(&rec->timer_lock, flags);
 363         if (! rec->timer_running) {
 364                 rec->timer.expires = jiffies + 1;
 365                 add_timer(&rec->timer);
 366                 rec->timer_running = 1;
 367         }
 368         spin_unlock_irqrestore(&rec->timer_lock, flags);
 369 }
 370
 371 /*
 372  * stop the voice immediately
 373  */
 374 static void stop_voice(emu8k_pcm_t *rec, int ch)
 375 {
 376         unsigned long flags;
 377         emu8000_t *hw = rec->emu;
 378
 379         EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
 380
 381         /* stop timer */
 382         spin_lock_irqsave(&rec->timer_lock, flags);
 383         if (rec->timer_running) {
 384                 del_timer(&rec->timer);
 385                 rec->timer_running = 0;
 386         }
 387         spin_unlock_irqrestore(&rec->timer_lock, flags);
 388 }
 389
 390 static int emu8k_pcm_trigger(snd_pcm_substream_t *subs, int cmd)
 391 {
 392         emu8k_pcm_t *rec = subs->runtime->private_data;
 393         int ch;
 394
 395         switch (cmd) {
 396         case SNDRV_PCM_TRIGGER_START:
 397                 for (ch = 0; ch < rec->voices; ch++)
 398                         start_voice(rec, ch);
 399                 rec->running = 1;
 400                 break;
 401         case SNDRV_PCM_TRIGGER_STOP:
 402                 rec->running = 0;
 403                 for (ch = 0; ch < rec->voices; ch++)
 404                         stop_voice(rec, ch);
 405                 break;
 406         default:
 407                 return -EINVAL;
 408         }
 409         return 0;
 410 }
 411
 412
 413 /*
 414  * copy / silence ops
 415  */
 416
 417 /*
 418  * this macro should be inserted in the copy/silence loops
 419  * to reduce the latency.  without this, the system will hang up
 420  * during the whole loop.
 421  */
 422 #define CHECK_SCHEDULER() \
 423 do { \
 424         cond_resched();\
 425         if (signal_pending(current))\
 426                 return -EAGAIN;\
 427 } while (0)
 428
 429
 430 #ifdef USE_NONINTERLEAVE
 431 /* copy one channel block */
 432 static int emu8k_transfer_block(emu8000_t *emu, int offset, unsigned short *buf, int count)
 433 {
 434         EMU8000_SMALW_WRITE(emu, offset);
 435         while (count > 0) {
 436                 unsigned short sval;
 437                 CHECK_SCHEDULER();
 438                 get_user(sval, buf);
 439                 EMU8000_SMLD_WRITE(emu, sval);
 440                 buf++;
 441                 count--;
 442         }
 443         return 0;
 444 }
 445
 446 static int emu8k_pcm_copy(snd_pcm_substream_t *subs,
 447                           int voice,
 448                           snd_pcm_uframes_t pos,
 449                           void *src,
 450                           snd_pcm_uframes_t count)
 451 {
 452         emu8k_pcm_t *rec = subs->runtime->private_data;
 453         emu8000_t *emu = rec->emu;
 454
 455         snd_emu8000_write_wait(emu, 1);
 456         if (voice == -1) {
 457                 unsigned short *buf = src;
 458                 int i, err;
 459                 count /= rec->voices;
 460                 for (i = 0; i < rec->voices; i++) {
 461                         err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count);
 462                         if (err < 0)
 463                                 return err;
 464                         buf += count;
 465                 }
 466                 return 0;
 467         } else {
 468                 return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count);
 469         }
 470 }
 471
 472 /* make a channel block silence */
 473 static int emu8k_silence_block(emu8000_t *emu, int offset, int count)
 474 {
 475         EMU8000_SMALW_WRITE(emu, offset);
 476         while (count > 0) {
 477                 CHECK_SCHEDULER();
 478                 EMU8000_SMLD_WRITE(emu, 0);
 479                 count--;
 480         }
 481         return 0;
 482 }
 483
 484 static int emu8k_pcm_silence(snd_pcm_substream_t *subs,
 485                              int voice,
 486                              snd_pcm_uframes_t pos,
 487                              snd_pcm_uframes_t count)
 488 {
 489         emu8k_pcm_t *rec = subs->runtime->private_data;
 490         emu8000_t *emu = rec->emu;
 491
 492         snd_emu8000_write_wait(emu, 1);
 493         if (voice == -1 && rec->voices == 1)
 494                 voice = 0;
 495         if (voice == -1) {
 496                 int err;
 497                 err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2);
 498                 if (err < 0)
 499                         return err;
 500                 return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2);
 501         } else {
 502                 return emu8k_silence_block(emu, pos + rec->loop_start[voice], count);
 503         }
 504 }
 505
 506 #else /* interleave */
 507
 508 /*
 509  * copy the interleaved data can be done easily by using
 510  * DMA "left" and "right" channels on emu8k engine.
 511  */
 512 static int emu8k_pcm_copy(snd_pcm_substream_t *subs,
 513                           int voice,
 514                           snd_pcm_uframes_t pos,
 515                           void __user *src,
 516                           snd_pcm_uframes_t count)
 517 {
 518         emu8k_pcm_t *rec = subs->runtime->private_data;
 519         emu8000_t *emu = rec->emu;
 520         unsigned short __user *buf = src;
 521
 522         snd_emu8000_write_wait(emu, 1);
 523         EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]);
 524         if (rec->voices > 1)
 525                 EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]);
 526
 527         while (count-- > 0) {
 528                 unsigned short sval;
 529                 CHECK_SCHEDULER();
 530                 get_user(sval, buf);
 531                 EMU8000_SMLD_WRITE(emu, sval);
 532                 buf++;
 533                 if (rec->voices > 1) {
 534                         CHECK_SCHEDULER();
 535                         get_user(sval, buf);
 536                         EMU8000_SMRD_WRITE(emu, sval);
 537                         buf++;
 538                 }
 539         }
 540         return 0;
 541 }
 542
 543 static int emu8k_pcm_silence(snd_pcm_substream_t *subs,
 544                              int voice,
 545                              snd_pcm_uframes_t pos,
 546                              snd_pcm_uframes_t count)
 547 {
 548         emu8k_pcm_t *rec = subs->runtime->private_data;
 549         emu8000_t *emu = rec->emu;
 550
 551         snd_emu8000_write_wait(emu, 1);
 552         EMU8000_SMALW_WRITE(emu, rec->loop_start[0] + pos);
 553         if (rec->voices > 1)
 554                 EMU8000_SMARW_WRITE(emu, rec->loop_start[1] + pos);
 555         while (count-- > 0) {
 556                 CHECK_SCHEDULER();
 557                 EMU8000_SMLD_WRITE(emu, 0);
 558                 if (rec->voices > 1) {
 559                         CHECK_SCHEDULER();
 560                         EMU8000_SMRD_WRITE(emu, 0);
 561                 }
 562         }
 563         return 0;
 564 }
 565 #endif
 566
 567
 568 /*
 569  * allocate a memory block
 570  */
 571 static int emu8k_pcm_hw_params(snd_pcm_substream_t *subs,
 572                                snd_pcm_hw_params_t *hw_params)
 573 {
 574         emu8k_pcm_t *rec = subs->runtime->private_data;
 575
 576         if (rec->block) {
 577                 /* reallocation - release the old block */
 578                 snd_util_mem_free(rec->emu->memhdr, rec->block);
 579                 rec->block = NULL;
 580         }
 581
 582         rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4;
 583         rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes);
 584         if (! rec->block)
 585                 return -ENOMEM;
 586         rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */
 587         /* at least dma_bytes must be set for non-interleaved mode */
 588         subs->dma_buffer.bytes = params_buffer_bytes(hw_params);
 589
 590         return 0;
 591 }
 592
 593 /*
 594  * free the memory block
 595  */
 596 static int emu8k_pcm_hw_free(snd_pcm_substream_t *subs)
 597 {
 598         emu8k_pcm_t *rec = subs->runtime->private_data;
 599
 600         if (rec->block) {
 601                 int ch;
 602                 for (ch = 0; ch < rec->voices; ch++)
 603                         stop_voice(rec, ch); // to be sure
 604                 if (rec->dram_opened)
 605                         emu8k_close_dram(rec->emu);
 606                 snd_util_mem_free(rec->emu->memhdr, rec->block);
 607                 rec->block = NULL;
 608         }
 609         return 0;
 610 }
 611
 612 /*
 613  */
 614 static int emu8k_pcm_prepare(snd_pcm_substream_t *subs)
 615 {
 616         emu8k_pcm_t *rec = subs->runtime->private_data;
 617
 618         rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate);
 619         rec->last_ptr = 0;
 620         rec->period_pos = 0;
 621
 622         rec->buf_size = subs->runtime->buffer_size;
 623         rec->period_size = subs->runtime->period_size;
 624         rec->voices = subs->runtime->channels;
 625         rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE;
 626         if (rec->voices > 1)
 627                 rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE;
 628         if (rec->voices > 1) {
 629                 rec->panning[0] = 0xff;
 630                 rec->panning[1] = 0x00;
 631         } else
 632                 rec->panning[0] = 0x80;
 633
 634         if (! rec->dram_opened) {
 635                 int err, i, ch;
 636
 637                 snd_emux_terminate_all(rec->emu->emu);
 638                 if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0)
 639                         return err;
 640                 rec->dram_opened = 1;
 641
 642                 /* clear loop blanks */
 643                 snd_emu8000_write_wait(rec->emu, 0);
 644                 EMU8000_SMALW_WRITE(rec->emu, rec->offset);
 645                 for (i = 0; i < LOOP_BLANK_SIZE; i++)
 646                         EMU8000_SMLD_WRITE(rec->emu, 0);
 647                 for (ch = 0; ch < rec->voices; ch++) {
 648                         EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size);
 649                         for (i = 0; i < LOOP_BLANK_SIZE; i++)
 650                                 EMU8000_SMLD_WRITE(rec->emu, 0);
 651                 }
 652         }
 653
 654         setup_voice(rec, 0);
 655         if (rec->voices > 1)
 656                 setup_voice(rec, 1);
 657         return 0;
 658 }
 659
 660 static snd_pcm_uframes_t emu8k_pcm_pointer(snd_pcm_substream_t *subs)
 661 {
 662         emu8k_pcm_t *rec = subs->runtime->private_data;
 663         if (rec->running)
 664                 return emu8k_get_curpos(rec, 0);
 665         return 0;
 666 }
 667
 668
 669 static snd_pcm_ops_t emu8k_pcm_ops = {
 670         .open =         emu8k_pcm_open,
 671         .close =        emu8k_pcm_close,
 672         .ioctl =        snd_pcm_lib_ioctl,
 673         .hw_params =    emu8k_pcm_hw_params,
 674         .hw_free =      emu8k_pcm_hw_free,
 675         .prepare =      emu8k_pcm_prepare,
 676         .trigger =      emu8k_pcm_trigger,
 677         .pointer =      emu8k_pcm_pointer,
 678         .copy =         emu8k_pcm_copy,
 679         .silence =      emu8k_pcm_silence,
 680 };
 681
 682
 683 static void snd_emu8000_pcm_free(snd_pcm_t *pcm)
 684 {
 685         emu8000_t *emu = pcm->private_data;
 686         emu->pcm = NULL;
 687 }
 688
 689 int snd_emu8000_pcm_new(snd_card_t *card, emu8000_t *emu, int index)
 690 {
 691         snd_pcm_t *pcm;
 692         int err;
 693
 694         if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0)
 695                 return err;
 696         pcm->private_data = emu;
 697         pcm->private_free = snd_emu8000_pcm_free;
 698         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops);
 699         emu->pcm = pcm;
 700
 701         snd_device_register(card, pcm);
 702
 703         return 0;
 704 }