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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * pcm emulation on emu8000 wavetable
0004  *
0005  *  Copyright (C) 2002 Takashi Iwai <tiwai@suse.de>
0006  */
0007 
0008 #include "emu8000_local.h"
0009 
0010 #include <linux/sched/signal.h>
0011 #include <linux/init.h>
0012 #include <linux/slab.h>
0013 #include <sound/initval.h>
0014 #include <sound/pcm.h>
0015 
0016 /*
0017  * define the following if you want to use this pcm with non-interleaved mode
0018  */
0019 /* #define USE_NONINTERLEAVE */
0020 
0021 /* NOTE: for using the non-interleaved mode with alsa-lib, you have to set
0022  * mmap_emulation flag to 1 in your .asoundrc, such like
0023  *
0024  *  pcm.emu8k {
0025  *      type plug
0026  *      slave.pcm {
0027  *          type hw
0028  *          card 0
0029  *          device 1
0030  *          mmap_emulation 1
0031  *      }
0032  *  }
0033  *
0034  * besides, for the time being, the non-interleaved mode doesn't work well on
0035  * alsa-lib...
0036  */
0037 
0038 
0039 struct snd_emu8k_pcm {
0040     struct snd_emu8000 *emu;
0041     struct snd_pcm_substream *substream;
0042 
0043     unsigned int allocated_bytes;
0044     struct snd_util_memblk *block;
0045     unsigned int offset;
0046     unsigned int buf_size;
0047     unsigned int period_size;
0048     unsigned int loop_start[2];
0049     unsigned int pitch;
0050     int panning[2];
0051     int last_ptr;
0052     int period_pos;
0053     int voices;
0054     unsigned int dram_opened: 1;
0055     unsigned int running: 1;
0056     unsigned int timer_running: 1;
0057     struct timer_list timer;
0058     spinlock_t timer_lock;
0059 };
0060 
0061 #define LOOP_BLANK_SIZE     8
0062 
0063 
0064 /*
0065  * open up channels for the simultaneous data transfer and playback
0066  */
0067 static int
0068 emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels)
0069 {
0070     int i;
0071 
0072     /* reserve up to 2 voices for playback */
0073     snd_emux_lock_voice(emu->emu, 0);
0074     if (channels > 1)
0075         snd_emux_lock_voice(emu->emu, 1);
0076 
0077     /* reserve 28 voices for loading */
0078     for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) {
0079         unsigned int mode = EMU8000_RAM_WRITE;
0080         snd_emux_lock_voice(emu->emu, i);
0081 #ifndef USE_NONINTERLEAVE
0082         if (channels > 1 && (i & 1) != 0)
0083             mode |= EMU8000_RAM_RIGHT;
0084 #endif
0085         snd_emu8000_dma_chan(emu, i, mode);
0086     }
0087 
0088     /* assign voice 31 and 32 to ROM */
0089     EMU8000_VTFT_WRITE(emu, 30, 0);
0090     EMU8000_PSST_WRITE(emu, 30, 0x1d8);
0091     EMU8000_CSL_WRITE(emu, 30, 0x1e0);
0092     EMU8000_CCCA_WRITE(emu, 30, 0x1d8);
0093     EMU8000_VTFT_WRITE(emu, 31, 0);
0094     EMU8000_PSST_WRITE(emu, 31, 0x1d8);
0095     EMU8000_CSL_WRITE(emu, 31, 0x1e0);
0096     EMU8000_CCCA_WRITE(emu, 31, 0x1d8);
0097 
0098     return 0;
0099 }
0100 
0101 /*
0102  */
0103 static void
0104 snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule)
0105 {
0106     while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
0107         if (can_schedule) {
0108             schedule_timeout_interruptible(1);
0109             if (signal_pending(current))
0110                 break;
0111         }
0112     }
0113 }
0114 
0115 /*
0116  * close all channels
0117  */
0118 static void
0119 emu8k_close_dram(struct snd_emu8000 *emu)
0120 {
0121     int i;
0122 
0123     for (i = 0; i < 2; i++)
0124         snd_emux_unlock_voice(emu->emu, i);
0125     for (; i < EMU8000_DRAM_VOICES; i++) {
0126         snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
0127         snd_emux_unlock_voice(emu->emu, i);
0128     }
0129 }
0130 
0131 /*
0132  * convert Hz to AWE32 rate offset (see emux/soundfont.c)
0133  */
0134 
0135 #define OFFSET_SAMPLERATE   1011119     /* base = 44100 */
0136 #define SAMPLERATE_RATIO    4096
0137 
0138 static int calc_rate_offset(int hz)
0139 {
0140     return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO);
0141 }
0142 
0143 
0144 /*
0145  */
0146 
0147 static const struct snd_pcm_hardware emu8k_pcm_hw = {
0148 #ifdef USE_NONINTERLEAVE
0149     .info =         SNDRV_PCM_INFO_NONINTERLEAVED,
0150 #else
0151     .info =         SNDRV_PCM_INFO_INTERLEAVED,
0152 #endif
0153     .formats =      SNDRV_PCM_FMTBIT_S16_LE,
0154     .rates =        SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
0155     .rate_min =     4000,
0156     .rate_max =     48000,
0157     .channels_min =     1,
0158     .channels_max =     2,
0159     .buffer_bytes_max = (128*1024),
0160     .period_bytes_min = 1024,
0161     .period_bytes_max = (128*1024),
0162     .periods_min =      2,
0163     .periods_max =      1024,
0164     .fifo_size =        0,
0165 
0166 };
0167 
0168 /*
0169  * get the current position at the given channel from CCCA register
0170  */
0171 static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch)
0172 {
0173     int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff;
0174     val -= rec->loop_start[ch] - 1;
0175     return val;
0176 }
0177 
0178 
0179 /*
0180  * timer interrupt handler
0181  * check the current position and update the period if necessary.
0182  */
0183 static void emu8k_pcm_timer_func(struct timer_list *t)
0184 {
0185     struct snd_emu8k_pcm *rec = from_timer(rec, t, timer);
0186     int ptr, delta;
0187 
0188     spin_lock(&rec->timer_lock);
0189     /* update the current pointer */
0190     ptr = emu8k_get_curpos(rec, 0);
0191     if (ptr < rec->last_ptr)
0192         delta = ptr + rec->buf_size - rec->last_ptr;
0193     else
0194         delta = ptr - rec->last_ptr;
0195     rec->period_pos += delta;
0196     rec->last_ptr = ptr;
0197 
0198     /* reprogram timer */
0199     mod_timer(&rec->timer, jiffies + 1);
0200 
0201     /* update period */
0202     if (rec->period_pos >= (int)rec->period_size) {
0203         rec->period_pos %= rec->period_size;
0204         spin_unlock(&rec->timer_lock);
0205         snd_pcm_period_elapsed(rec->substream);
0206         return;
0207     }
0208     spin_unlock(&rec->timer_lock);
0209 }
0210 
0211 
0212 /*
0213  * open pcm
0214  * creating an instance here
0215  */
0216 static int emu8k_pcm_open(struct snd_pcm_substream *subs)
0217 {
0218     struct snd_emu8000 *emu = snd_pcm_substream_chip(subs);
0219     struct snd_emu8k_pcm *rec;
0220     struct snd_pcm_runtime *runtime = subs->runtime;
0221 
0222     rec = kzalloc(sizeof(*rec), GFP_KERNEL);
0223     if (! rec)
0224         return -ENOMEM;
0225 
0226     rec->emu = emu;
0227     rec->substream = subs;
0228     runtime->private_data = rec;
0229 
0230     spin_lock_init(&rec->timer_lock);
0231     timer_setup(&rec->timer, emu8k_pcm_timer_func, 0);
0232 
0233     runtime->hw = emu8k_pcm_hw;
0234     runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
0235     runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;
0236 
0237     /* use timer to update periods.. (specified in msec) */
0238     snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
0239                      (1000000 + HZ - 1) / HZ, UINT_MAX);
0240 
0241     return 0;
0242 }
0243 
0244 static int emu8k_pcm_close(struct snd_pcm_substream *subs)
0245 {
0246     struct snd_emu8k_pcm *rec = subs->runtime->private_data;
0247     kfree(rec);
0248     subs->runtime->private_data = NULL;
0249     return 0;
0250 }
0251 
0252 /*
0253  * calculate pitch target
0254  */
0255 static int calc_pitch_target(int pitch)
0256 {
0257     int ptarget = 1 << (pitch >> 12);
0258     if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
0259     if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
0260     if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
0261     ptarget += (ptarget >> 1);
0262     if (ptarget > 0xffff) ptarget = 0xffff;
0263     return ptarget;
0264 }
0265 
0266 /*
0267  * set up the voice
0268  */
0269 static void setup_voice(struct snd_emu8k_pcm *rec, int ch)
0270 {
0271     struct snd_emu8000 *hw = rec->emu;
0272     unsigned int temp;
0273 
0274     /* channel to be silent and idle */
0275     EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
0276     EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
0277     EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
0278     EMU8000_PTRX_WRITE(hw, ch, 0);
0279     EMU8000_CPF_WRITE(hw, ch, 0);
0280 
0281     /* pitch offset */
0282     EMU8000_IP_WRITE(hw, ch, rec->pitch);
0283     /* set envelope parameters */
0284     EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
0285     EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
0286     EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
0287     EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
0288     EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
0289     /* decay/sustain parameter for volume envelope is used
0290        for triggerg the voice */
0291     /* modulation envelope heights */
0292     EMU8000_PEFE_WRITE(hw, ch, 0x0);
0293     /* lfo1/2 delay */
0294     EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
0295     EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
0296     /* lfo1 pitch & cutoff shift */
0297     EMU8000_FMMOD_WRITE(hw, ch, 0);
0298     /* lfo1 volume & freq */
0299     EMU8000_TREMFRQ_WRITE(hw, ch, 0);
0300     /* lfo2 pitch & freq */
0301     EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
0302     /* pan & loop start */
0303     temp = rec->panning[ch];
0304     temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);
0305     EMU8000_PSST_WRITE(hw, ch, temp);
0306     /* chorus & loop end (chorus 8bit, MSB) */
0307     temp = 0; // chorus
0308     temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
0309     EMU8000_CSL_WRITE(hw, ch, temp);
0310     /* Q & current address (Q 4bit value, MSB) */
0311     temp = 0; // filterQ
0312     temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);
0313     EMU8000_CCCA_WRITE(hw, ch, temp);
0314     /* clear unknown registers */
0315     EMU8000_00A0_WRITE(hw, ch, 0);
0316     EMU8000_0080_WRITE(hw, ch, 0);
0317 }
0318 
0319 /*
0320  * trigger the voice
0321  */
0322 static void start_voice(struct snd_emu8k_pcm *rec, int ch)
0323 {
0324     unsigned long flags;
0325     struct snd_emu8000 *hw = rec->emu;
0326     unsigned int temp, aux;
0327     int pt = calc_pitch_target(rec->pitch);
0328 
0329     /* cutoff and volume */
0330     EMU8000_IFATN_WRITE(hw, ch, 0xff00);
0331     EMU8000_VTFT_WRITE(hw, ch, 0xffff);
0332     EMU8000_CVCF_WRITE(hw, ch, 0xffff);
0333     /* trigger envelope */
0334     EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
0335     /* set reverb and pitch target */
0336     temp = 0; // reverb
0337     if (rec->panning[ch] == 0)
0338         aux = 0xff;
0339     else
0340         aux = (-rec->panning[ch]) & 0xff;
0341     temp = (temp << 8) | (pt << 16) | aux;
0342     EMU8000_PTRX_WRITE(hw, ch, temp);
0343     EMU8000_CPF_WRITE(hw, ch, pt << 16);
0344 
0345     /* start timer */
0346     spin_lock_irqsave(&rec->timer_lock, flags);
0347     if (! rec->timer_running) {
0348         mod_timer(&rec->timer, jiffies + 1);
0349         rec->timer_running = 1;
0350     }
0351     spin_unlock_irqrestore(&rec->timer_lock, flags);
0352 }
0353 
0354 /*
0355  * stop the voice immediately
0356  */
0357 static void stop_voice(struct snd_emu8k_pcm *rec, int ch)
0358 {
0359     unsigned long flags;
0360     struct snd_emu8000 *hw = rec->emu;
0361 
0362     EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
0363 
0364     /* stop timer */
0365     spin_lock_irqsave(&rec->timer_lock, flags);
0366     if (rec->timer_running) {
0367         del_timer(&rec->timer);
0368         rec->timer_running = 0;
0369     }
0370     spin_unlock_irqrestore(&rec->timer_lock, flags);
0371 }
0372 
0373 static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
0374 {
0375     struct snd_emu8k_pcm *rec = subs->runtime->private_data;
0376     int ch;
0377 
0378     switch (cmd) {
0379     case SNDRV_PCM_TRIGGER_START:
0380         for (ch = 0; ch < rec->voices; ch++)
0381             start_voice(rec, ch);
0382         rec->running = 1;
0383         break;
0384     case SNDRV_PCM_TRIGGER_STOP:
0385         rec->running = 0;
0386         for (ch = 0; ch < rec->voices; ch++)
0387             stop_voice(rec, ch);
0388         break;
0389     default:
0390         return -EINVAL;
0391     }
0392     return 0;
0393 }
0394 
0395 
0396 /*
0397  * copy / silence ops
0398  */
0399 
0400 /*
0401  * this macro should be inserted in the copy/silence loops
0402  * to reduce the latency.  without this, the system will hang up
0403  * during the whole loop.
0404  */
0405 #define CHECK_SCHEDULER() \
0406 do { \
0407     cond_resched();\
0408     if (signal_pending(current))\
0409         return -EAGAIN;\
0410 } while (0)
0411 
0412 enum {
0413     COPY_USER, COPY_KERNEL, FILL_SILENCE,
0414 };
0415 
0416 #define GET_VAL(sval, buf, mode)                    \
0417     do {                                \
0418         switch (mode) {                     \
0419         case FILL_SILENCE:                  \
0420             sval = 0;                   \
0421             break;                      \
0422         case COPY_KERNEL:                   \
0423             sval = *buf++;                  \
0424             break;                      \
0425         default:                        \
0426             if (get_user(sval, (unsigned short __user *)buf)) \
0427                 return -EFAULT;             \
0428             buf++;                      \
0429             break;                      \
0430         }                           \
0431     } while (0)
0432 
0433 #ifdef USE_NONINTERLEAVE
0434 
0435 #define LOOP_WRITE(rec, offset, _buf, count, mode)      \
0436     do {                            \
0437         struct snd_emu8000 *emu = (rec)->emu;       \
0438         unsigned short *buf = (__force unsigned short *)(_buf); \
0439         snd_emu8000_write_wait(emu, 1);         \
0440         EMU8000_SMALW_WRITE(emu, offset);       \
0441         while (count > 0) {             \
0442             unsigned short sval;            \
0443             CHECK_SCHEDULER();          \
0444             GET_VAL(sval, buf, mode);       \
0445             EMU8000_SMLD_WRITE(emu, sval);      \
0446             count--;                \
0447         }                       \
0448     } while (0)
0449 
0450 /* copy one channel block */
0451 static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
0452               int voice, unsigned long pos,
0453               void __user *src, unsigned long count)
0454 {
0455     struct snd_emu8k_pcm *rec = subs->runtime->private_data;
0456 
0457     /* convert to word unit */
0458     pos = (pos << 1) + rec->loop_start[voice];
0459     count <<= 1;
0460     LOOP_WRITE(rec, pos, src, count, COPY_USER);
0461     return 0;
0462 }
0463 
0464 static int emu8k_pcm_copy_kernel(struct snd_pcm_substream *subs,
0465                  int voice, unsigned long pos,
0466                  void *src, unsigned long count)
0467 {
0468     struct snd_emu8k_pcm *rec = subs->runtime->private_data;
0469 
0470     /* convert to word unit */
0471     pos = (pos << 1) + rec->loop_start[voice];
0472     count <<= 1;
0473     LOOP_WRITE(rec, pos, src, count, COPY_KERNEL);
0474     return 0;
0475 }
0476 
0477 /* make a channel block silence */
0478 static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
0479                  int voice, unsigned long pos, unsigned long count)
0480 {
0481     struct snd_emu8k_pcm *rec = subs->runtime->private_data;
0482 
0483     /* convert to word unit */
0484     pos = (pos << 1) + rec->loop_start[voice];
0485     count <<= 1;
0486     LOOP_WRITE(rec, pos, NULL, count, FILL_SILENCE);
0487     return 0;
0488 }
0489 
0490 #else /* interleave */
0491 
0492 #define LOOP_WRITE(rec, pos, _buf, count, mode)             \
0493     do {                                \
0494         struct snd_emu8000 *emu = rec->emu;         \
0495         unsigned short *buf = (__force unsigned short *)(_buf); \
0496         snd_emu8000_write_wait(emu, 1);             \
0497         EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]); \
0498         if (rec->voices > 1)                    \
0499             EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]); \
0500         while (count > 0) {                 \
0501             unsigned short sval;                \
0502             CHECK_SCHEDULER();              \
0503             GET_VAL(sval, buf, mode);           \
0504             EMU8000_SMLD_WRITE(emu, sval);          \
0505             if (rec->voices > 1) {              \
0506                 CHECK_SCHEDULER();          \
0507                 GET_VAL(sval, buf, mode);       \
0508                 EMU8000_SMRD_WRITE(emu, sval);      \
0509             }                       \
0510             count--;                    \
0511         }                           \
0512     } while (0)
0513 
0514 
0515 /*
0516  * copy the interleaved data can be done easily by using
0517  * DMA "left" and "right" channels on emu8k engine.
0518  */
0519 static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
0520               int voice, unsigned long pos,
0521               void __user *src, unsigned long count)
0522 {
0523     struct snd_emu8k_pcm *rec = subs->runtime->private_data;
0524 
0525     /* convert to frames */
0526     pos = bytes_to_frames(subs->runtime, pos);
0527     count = bytes_to_frames(subs->runtime, count);
0528     LOOP_WRITE(rec, pos, src, count, COPY_USER);
0529     return 0;
0530 }
0531 
0532 static int emu8k_pcm_copy_kernel(struct snd_pcm_substream *subs,
0533                  int voice, unsigned long pos,
0534                  void *src, unsigned long count)
0535 {
0536     struct snd_emu8k_pcm *rec = subs->runtime->private_data;
0537 
0538     /* convert to frames */
0539     pos = bytes_to_frames(subs->runtime, pos);
0540     count = bytes_to_frames(subs->runtime, count);
0541     LOOP_WRITE(rec, pos, src, count, COPY_KERNEL);
0542     return 0;
0543 }
0544 
0545 static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
0546                  int voice, unsigned long pos, unsigned long count)
0547 {
0548     struct snd_emu8k_pcm *rec = subs->runtime->private_data;
0549 
0550     /* convert to frames */
0551     pos = bytes_to_frames(subs->runtime, pos);
0552     count = bytes_to_frames(subs->runtime, count);
0553     LOOP_WRITE(rec, pos, NULL, count, FILL_SILENCE);
0554     return 0;
0555 }
0556 #endif
0557 
0558 
0559 /*
0560  * allocate a memory block
0561  */
0562 static int emu8k_pcm_hw_params(struct snd_pcm_substream *subs,
0563                    struct snd_pcm_hw_params *hw_params)
0564 {
0565     struct snd_emu8k_pcm *rec = subs->runtime->private_data;
0566 
0567     if (rec->block) {
0568         /* reallocation - release the old block */
0569         snd_util_mem_free(rec->emu->memhdr, rec->block);
0570         rec->block = NULL;
0571     }
0572 
0573     rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4;
0574     rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes);
0575     if (! rec->block)
0576         return -ENOMEM;
0577     rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */
0578     /* at least dma_bytes must be set for non-interleaved mode */
0579     subs->dma_buffer.bytes = params_buffer_bytes(hw_params);
0580 
0581     return 0;
0582 }
0583 
0584 /*
0585  * free the memory block
0586  */
0587 static int emu8k_pcm_hw_free(struct snd_pcm_substream *subs)
0588 {
0589     struct snd_emu8k_pcm *rec = subs->runtime->private_data;
0590 
0591     if (rec->block) {
0592         int ch;
0593         for (ch = 0; ch < rec->voices; ch++)
0594             stop_voice(rec, ch); // to be sure
0595         if (rec->dram_opened)
0596             emu8k_close_dram(rec->emu);
0597         snd_util_mem_free(rec->emu->memhdr, rec->block);
0598         rec->block = NULL;
0599     }
0600     return 0;
0601 }
0602 
0603 /*
0604  */
0605 static int emu8k_pcm_prepare(struct snd_pcm_substream *subs)
0606 {
0607     struct snd_emu8k_pcm *rec = subs->runtime->private_data;
0608 
0609     rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate);
0610     rec->last_ptr = 0;
0611     rec->period_pos = 0;
0612 
0613     rec->buf_size = subs->runtime->buffer_size;
0614     rec->period_size = subs->runtime->period_size;
0615     rec->voices = subs->runtime->channels;
0616     rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE;
0617     if (rec->voices > 1)
0618         rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE;
0619     if (rec->voices > 1) {
0620         rec->panning[0] = 0xff;
0621         rec->panning[1] = 0x00;
0622     } else
0623         rec->panning[0] = 0x80;
0624 
0625     if (! rec->dram_opened) {
0626         int err, i, ch;
0627 
0628         snd_emux_terminate_all(rec->emu->emu);
0629         err = emu8k_open_dram_for_pcm(rec->emu, rec->voices);
0630         if (err)
0631             return err;
0632         rec->dram_opened = 1;
0633 
0634         /* clear loop blanks */
0635         snd_emu8000_write_wait(rec->emu, 0);
0636         EMU8000_SMALW_WRITE(rec->emu, rec->offset);
0637         for (i = 0; i < LOOP_BLANK_SIZE; i++)
0638             EMU8000_SMLD_WRITE(rec->emu, 0);
0639         for (ch = 0; ch < rec->voices; ch++) {
0640             EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size);
0641             for (i = 0; i < LOOP_BLANK_SIZE; i++)
0642                 EMU8000_SMLD_WRITE(rec->emu, 0);
0643         }
0644     }
0645 
0646     setup_voice(rec, 0);
0647     if (rec->voices > 1)
0648         setup_voice(rec, 1);
0649     return 0;
0650 }
0651 
0652 static snd_pcm_uframes_t emu8k_pcm_pointer(struct snd_pcm_substream *subs)
0653 {
0654     struct snd_emu8k_pcm *rec = subs->runtime->private_data;
0655     if (rec->running)
0656         return emu8k_get_curpos(rec, 0);
0657     return 0;
0658 }
0659 
0660 
0661 static const struct snd_pcm_ops emu8k_pcm_ops = {
0662     .open =     emu8k_pcm_open,
0663     .close =    emu8k_pcm_close,
0664     .hw_params =    emu8k_pcm_hw_params,
0665     .hw_free =  emu8k_pcm_hw_free,
0666     .prepare =  emu8k_pcm_prepare,
0667     .trigger =  emu8k_pcm_trigger,
0668     .pointer =  emu8k_pcm_pointer,
0669     .copy_user =    emu8k_pcm_copy,
0670     .copy_kernel =  emu8k_pcm_copy_kernel,
0671     .fill_silence = emu8k_pcm_silence,
0672 };
0673 
0674 
0675 static void snd_emu8000_pcm_free(struct snd_pcm *pcm)
0676 {
0677     struct snd_emu8000 *emu = pcm->private_data;
0678     emu->pcm = NULL;
0679 }
0680 
0681 int snd_emu8000_pcm_new(struct snd_card *card, struct snd_emu8000 *emu, int index)
0682 {
0683     struct snd_pcm *pcm;
0684     int err;
0685 
0686     err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm);
0687     if (err < 0)
0688         return err;
0689     pcm->private_data = emu;
0690     pcm->private_free = snd_emu8000_pcm_free;
0691     snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops);
0692     emu->pcm = pcm;
0693 
0694     snd_device_register(card, pcm);
0695 
0696     return 0;
0697 }
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