[mirror_ubuntu-jammy-kernel.git] / sound / isa / sb / emu8000_pcm.c

/*
 * pcm emulation on emu8000 wavetable
 *
 *  Copyright (C) 2002 Takashi Iwai <tiwai@suse.de>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include "emu8000_local.h"
#include <linux/init.h>
#include <linux/slab.h>
#include <sound/initval.h>
#include <sound/pcm.h>

/*
 * define the following if you want to use this pcm with non-interleaved mode
 */
/* #define USE_NONINTERLEAVE */

/* NOTE: for using the non-interleaved mode with alsa-lib, you have to set
 * mmap_emulation flag to 1 in your .asoundrc, such like
 *
 *	pcm.emu8k {
 *		type plug
 *		slave.pcm {
 *			type hw
 *			card 0
 *			device 1
 *			mmap_emulation 1
 *		}
 *	}
 *
 * besides, for the time being, the non-interleaved mode doesn't work well on
 * alsa-lib...
 */


struct snd_emu8k_pcm {
	struct snd_emu8000 *emu;
	struct snd_pcm_substream *substream;

	unsigned int allocated_bytes;
	struct snd_util_memblk *block;
	unsigned int offset;
	unsigned int buf_size;
	unsigned int period_size;
	unsigned int loop_start[2];
	unsigned int pitch;
	int panning[2];
	int last_ptr;
	int period_pos;
	int voices;
	unsigned int dram_opened: 1;
	unsigned int running: 1;
	unsigned int timer_running: 1;
	struct timer_list timer;
	spinlock_t timer_lock;
};

#define LOOP_BLANK_SIZE		8


/*
 * open up channels for the simultaneous data transfer and playback
 */
static int
emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels)
{
	int i;

	/* reserve up to 2 voices for playback */
	snd_emux_lock_voice(emu->emu, 0);
	if (channels > 1)
		snd_emux_lock_voice(emu->emu, 1);

	/* reserve 28 voices for loading */
	for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) {
		unsigned int mode = EMU8000_RAM_WRITE;
		snd_emux_lock_voice(emu->emu, i);
#ifndef USE_NONINTERLEAVE
		if (channels > 1 && (i & 1) != 0)
			mode |= EMU8000_RAM_RIGHT;
#endif
		snd_emu8000_dma_chan(emu, i, mode);
	}

	/* assign voice 31 and 32 to ROM */
	EMU8000_VTFT_WRITE(emu, 30, 0);
	EMU8000_PSST_WRITE(emu, 30, 0x1d8);
	EMU8000_CSL_WRITE(emu, 30, 0x1e0);
	EMU8000_CCCA_WRITE(emu, 30, 0x1d8);
	EMU8000_VTFT_WRITE(emu, 31, 0);
	EMU8000_PSST_WRITE(emu, 31, 0x1d8);
	EMU8000_CSL_WRITE(emu, 31, 0x1e0);
	EMU8000_CCCA_WRITE(emu, 31, 0x1d8);

	return 0;
}

/*
 */
static void
snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule)
{
	while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
		if (can_schedule) {
			schedule_timeout_interruptible(1);
			if (signal_pending(current))
				break;
		}
	}
}

/*
 * close all channels
 */
static void
emu8k_close_dram(struct snd_emu8000 *emu)
{
	int i;

	for (i = 0; i < 2; i++)
		snd_emux_unlock_voice(emu->emu, i);
	for (; i < EMU8000_DRAM_VOICES; i++) {
		snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
		snd_emux_unlock_voice(emu->emu, i);
	}
}

/*
 * convert Hz to AWE32 rate offset (see emux/soundfont.c)
 */

#define OFFSET_SAMPLERATE	1011119		/* base = 44100 */
#define SAMPLERATE_RATIO	4096

static int calc_rate_offset(int hz)
{
	return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO);
}


/*
 */

static struct snd_pcm_hardware emu8k_pcm_hw = {
#ifdef USE_NONINTERLEAVE
	.info =			SNDRV_PCM_INFO_NONINTERLEAVED,
#else
	.info =			SNDRV_PCM_INFO_INTERLEAVED,
#endif
	.formats =		SNDRV_PCM_FMTBIT_S16_LE,
	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		4000,
	.rate_max =		48000,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(128*1024),
	.period_bytes_min =	1024,
	.period_bytes_max =	(128*1024),
	.periods_min =		2,
	.periods_max =		1024,
	.fifo_size =		0,

};

/*
 * get the current position at the given channel from CCCA register
 */
static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch)
{
	int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff;
	val -= rec->loop_start[ch] - 1;
	return val;
}


/*
 * timer interrupt handler
 * check the current position and update the period if necessary.
 */
static void emu8k_pcm_timer_func(unsigned long data)
{
	struct snd_emu8k_pcm *rec = (struct snd_emu8k_pcm *)data;
	int ptr, delta;

	spin_lock(&rec->timer_lock);
	/* update the current pointer */
	ptr = emu8k_get_curpos(rec, 0);
	if (ptr < rec->last_ptr)
		delta = ptr + rec->buf_size - rec->last_ptr;
	else
		delta = ptr - rec->last_ptr;
	rec->period_pos += delta;
	rec->last_ptr = ptr;

	/* reprogram timer */
	rec->timer.expires = jiffies + 1;
	add_timer(&rec->timer);

	/* update period */
	if (rec->period_pos >= (int)rec->period_size) {
		rec->period_pos %= rec->period_size;
		spin_unlock(&rec->timer_lock);
		snd_pcm_period_elapsed(rec->substream);
		return;
	}
	spin_unlock(&rec->timer_lock);
}


/*
 * open pcm
 * creating an instance here
 */
static int emu8k_pcm_open(struct snd_pcm_substream *subs)
{
	struct snd_emu8000 *emu = snd_pcm_substream_chip(subs);
	struct snd_emu8k_pcm *rec;
	struct snd_pcm_runtime *runtime = subs->runtime;

	rec = kzalloc(sizeof(*rec), GFP_KERNEL);
	if (! rec)
		return -ENOMEM;

	rec->emu = emu;
	rec->substream = subs;
	runtime->private_data = rec;

	spin_lock_init(&rec->timer_lock);
	init_timer(&rec->timer);
	rec->timer.function = emu8k_pcm_timer_func;
	rec->timer.data = (unsigned long)rec;

	runtime->hw = emu8k_pcm_hw;
	runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
	runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;

	/* use timer to update periods.. (specified in msec) */
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
				     (1000000 + HZ - 1) / HZ, UINT_MAX);

	return 0;
}

static int emu8k_pcm_close(struct snd_pcm_substream *subs)
{
	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
	kfree(rec);
	subs->runtime->private_data = NULL;
	return 0;
}

/*
 * calculate pitch target
 */
static int calc_pitch_target(int pitch)
{
	int ptarget = 1 << (pitch >> 12);
	if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
	if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
	if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
	ptarget += (ptarget >> 1);
	if (ptarget > 0xffff) ptarget = 0xffff;
	return ptarget;
}

/*
 * set up the voice
 */
static void setup_voice(struct snd_emu8k_pcm *rec, int ch)
{
	struct snd_emu8000 *hw = rec->emu;
	unsigned int temp;

	/* channel to be silent and idle */
	EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
	EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
	EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
	EMU8000_PTRX_WRITE(hw, ch, 0);
	EMU8000_CPF_WRITE(hw, ch, 0);

	/* pitch offset */
	EMU8000_IP_WRITE(hw, ch, rec->pitch);
	/* set envelope parameters */
	EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
	EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
	EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
	EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
	EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
	/* decay/sustain parameter for volume envelope is used
	   for triggerg the voice */
	/* modulation envelope heights */
	EMU8000_PEFE_WRITE(hw, ch, 0x0);
	/* lfo1/2 delay */
	EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
	EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
	/* lfo1 pitch & cutoff shift */
	EMU8000_FMMOD_WRITE(hw, ch, 0);
	/* lfo1 volume & freq */
	EMU8000_TREMFRQ_WRITE(hw, ch, 0);
	/* lfo2 pitch & freq */
	EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
	/* pan & loop start */
	temp = rec->panning[ch];
	temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);
	EMU8000_PSST_WRITE(hw, ch, temp);
	/* chorus & loop end (chorus 8bit, MSB) */
	temp = 0; // chorus
	temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
	EMU8000_CSL_WRITE(hw, ch, temp);
	/* Q & current address (Q 4bit value, MSB) */
	temp = 0; // filterQ
	temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);
	EMU8000_CCCA_WRITE(hw, ch, temp);
	/* clear unknown registers */
	EMU8000_00A0_WRITE(hw, ch, 0);
	EMU8000_0080_WRITE(hw, ch, 0);
}

/*
 * trigger the voice
 */
static void start_voice(struct snd_emu8k_pcm *rec, int ch)
{
	unsigned long flags;
	struct snd_emu8000 *hw = rec->emu;
	unsigned int temp, aux;
	int pt = calc_pitch_target(rec->pitch);

	/* cutoff and volume */
	EMU8000_IFATN_WRITE(hw, ch, 0xff00);
	EMU8000_VTFT_WRITE(hw, ch, 0xffff);
	EMU8000_CVCF_WRITE(hw, ch, 0xffff);
	/* trigger envelope */
	EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
	/* set reverb and pitch target */
	temp = 0; // reverb
	if (rec->panning[ch] == 0)
		aux = 0xff;
	else
		aux = (-rec->panning[ch]) & 0xff;
	temp = (temp << 8) | (pt << 16) | aux;
	EMU8000_PTRX_WRITE(hw, ch, temp);
	EMU8000_CPF_WRITE(hw, ch, pt << 16);

	/* start timer */
	spin_lock_irqsave(&rec->timer_lock, flags);
	if (! rec->timer_running) {
		rec->timer.expires = jiffies + 1;
		add_timer(&rec->timer);
		rec->timer_running = 1;
	}
	spin_unlock_irqrestore(&rec->timer_lock, flags);
}

/*
 * stop the voice immediately
 */
static void stop_voice(struct snd_emu8k_pcm *rec, int ch)
{
	unsigned long flags;
	struct snd_emu8000 *hw = rec->emu;

	EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);

	/* stop timer */
	spin_lock_irqsave(&rec->timer_lock, flags);
	if (rec->timer_running) {
		del_timer(&rec->timer);
		rec->timer_running = 0;
	}
	spin_unlock_irqrestore(&rec->timer_lock, flags);
}

static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
{
	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
	int ch;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		for (ch = 0; ch < rec->voices; ch++)
			start_voice(rec, ch);
		rec->running = 1;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		rec->running = 0;
		for (ch = 0; ch < rec->voices; ch++)
			stop_voice(rec, ch);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}


/*
 * copy / silence ops
 */

/*
 * this macro should be inserted in the copy/silence loops
 * to reduce the latency.  without this, the system will hang up
 * during the whole loop.
 */
#define CHECK_SCHEDULER() \
do { \
	cond_resched();\
	if (signal_pending(current))\
		return -EAGAIN;\
} while (0)


#ifdef USE_NONINTERLEAVE
/* copy one channel block */
static int emu8k_transfer_block(struct snd_emu8000 *emu, int offset, unsigned short *buf, int count)
{
	EMU8000_SMALW_WRITE(emu, offset);
	while (count > 0) {
		unsigned short sval;
		CHECK_SCHEDULER();
		if (get_user(sval, buf))
			return -EFAULT;
		EMU8000_SMLD_WRITE(emu, sval);
		buf++;
		count--;
	}
	return 0;
}

static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
			  int voice,
			  snd_pcm_uframes_t pos,
			  void *src,
			  snd_pcm_uframes_t count)
{
	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
	struct snd_emu8000 *emu = rec->emu;

	snd_emu8000_write_wait(emu, 1);
	if (voice == -1) {
		unsigned short *buf = src;
		int i, err;
		count /= rec->voices;
		for (i = 0; i < rec->voices; i++) {
			err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count);
			if (err < 0)
				return err;
			buf += count;
		}
		return 0;
	} else {
		return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count);
	}
}

/* make a channel block silence */
static int emu8k_silence_block(struct snd_emu8000 *emu, int offset, int count)
{
	EMU8000_SMALW_WRITE(emu, offset);
	while (count > 0) {
		CHECK_SCHEDULER();
		EMU8000_SMLD_WRITE(emu, 0);
		count--;
	}
	return 0;
}

static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
			     int voice,
			     snd_pcm_uframes_t pos,
			     snd_pcm_uframes_t count)
{
	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
	struct snd_emu8000 *emu = rec->emu;

	snd_emu8000_write_wait(emu, 1);
	if (voice == -1 && rec->voices == 1)
		voice = 0;
	if (voice == -1) {
		int err;
		err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2);
		if (err < 0)
			return err;
		return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2);
	} else {
		return emu8k_silence_block(emu, pos + rec->loop_start[voice], count);
	}
}

#else /* interleave */

/*
 * copy the interleaved data can be done easily by using
 * DMA "left" and "right" channels on emu8k engine.
 */
static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
			  int voice,
			  snd_pcm_uframes_t pos,
			  void __user *src,
			  snd_pcm_uframes_t count)
{
	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
	struct snd_emu8000 *emu = rec->emu;
	unsigned short __user *buf = src;

	snd_emu8000_write_wait(emu, 1);
	EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]);
	if (rec->voices > 1)
		EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]);

	while (count-- > 0) {
		unsigned short sval;
		CHECK_SCHEDULER();
		if (get_user(sval, buf))
			return -EFAULT;
		EMU8000_SMLD_WRITE(emu, sval);
		buf++;
		if (rec->voices > 1) {
			CHECK_SCHEDULER();
			if (get_user(sval, buf))
				return -EFAULT;
			EMU8000_SMRD_WRITE(emu, sval);
			buf++;
		}
	}
	return 0;
}

static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
			     int voice,
			     snd_pcm_uframes_t pos,
			     snd_pcm_uframes_t count)
{
	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
	struct snd_emu8000 *emu = rec->emu;

	snd_emu8000_write_wait(emu, 1);
	EMU8000_SMALW_WRITE(emu, rec->loop_start[0] + pos);
	if (rec->voices > 1)
		EMU8000_SMARW_WRITE(emu, rec->loop_start[1] + pos);
	while (count-- > 0) {
		CHECK_SCHEDULER();
		EMU8000_SMLD_WRITE(emu, 0);
		if (rec->voices > 1) {
			CHECK_SCHEDULER();
			EMU8000_SMRD_WRITE(emu, 0);
		}
	}
	return 0;
}
#endif


/*
 * allocate a memory block
 */
static int emu8k_pcm_hw_params(struct snd_pcm_substream *subs,
			       struct snd_pcm_hw_params *hw_params)
{
	struct snd_emu8k_pcm *rec = subs->runtime->private_data;

	if (rec->block) {
		/* reallocation - release the old block */
		snd_util_mem_free(rec->emu->memhdr, rec->block);
		rec->block = NULL;
	}

	rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4;
	rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes);
	if (! rec->block)
		return -ENOMEM;
	rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */
	/* at least dma_bytes must be set for non-interleaved mode */
	subs->dma_buffer.bytes = params_buffer_bytes(hw_params);

	return 0;
}

/*
 * free the memory block
 */
static int emu8k_pcm_hw_free(struct snd_pcm_substream *subs)
{
	struct snd_emu8k_pcm *rec = subs->runtime->private_data;

	if (rec->block) {
		int ch;
		for (ch = 0; ch < rec->voices; ch++)
			stop_voice(rec, ch); // to be sure
		if (rec->dram_opened)
			emu8k_close_dram(rec->emu);
		snd_util_mem_free(rec->emu->memhdr, rec->block);
		rec->block = NULL;
	}
	return 0;
}

/*
 */
static int emu8k_pcm_prepare(struct snd_pcm_substream *subs)
{
	struct snd_emu8k_pcm *rec = subs->runtime->private_data;

	rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate);
	rec->last_ptr = 0;
	rec->period_pos = 0;

	rec->buf_size = subs->runtime->buffer_size;
	rec->period_size = subs->runtime->period_size;
	rec->voices = subs->runtime->channels;
	rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE;
	if (rec->voices > 1)
		rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE;
	if (rec->voices > 1) {
		rec->panning[0] = 0xff;
		rec->panning[1] = 0x00;
	} else
		rec->panning[0] = 0x80;

	if (! rec->dram_opened) {
		int err, i, ch;

		snd_emux_terminate_all(rec->emu->emu);
		if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0)
			return err;
		rec->dram_opened = 1;

		/* clear loop blanks */
		snd_emu8000_write_wait(rec->emu, 0);
		EMU8000_SMALW_WRITE(rec->emu, rec->offset);
		for (i = 0; i < LOOP_BLANK_SIZE; i++)
			EMU8000_SMLD_WRITE(rec->emu, 0);
		for (ch = 0; ch < rec->voices; ch++) {
			EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size);
			for (i = 0; i < LOOP_BLANK_SIZE; i++)
				EMU8000_SMLD_WRITE(rec->emu, 0);
		}
	}

	setup_voice(rec, 0);
	if (rec->voices > 1)
		setup_voice(rec, 1);
	return 0;
}

static snd_pcm_uframes_t emu8k_pcm_pointer(struct snd_pcm_substream *subs)
{
	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
	if (rec->running)
		return emu8k_get_curpos(rec, 0);
	return 0;
}


static struct snd_pcm_ops emu8k_pcm_ops = {
	.open =		emu8k_pcm_open,
	.close =	emu8k_pcm_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	emu8k_pcm_hw_params,
	.hw_free =	emu8k_pcm_hw_free,
	.prepare =	emu8k_pcm_prepare,
	.trigger =	emu8k_pcm_trigger,
	.pointer =	emu8k_pcm_pointer,
	.copy =		emu8k_pcm_copy,
	.silence =	emu8k_pcm_silence,
};


static void snd_emu8000_pcm_free(struct snd_pcm *pcm)
{
	struct snd_emu8000 *emu = pcm->private_data;
	emu->pcm = NULL;
}

int snd_emu8000_pcm_new(struct snd_card *card, struct snd_emu8000 *emu, int index)
{
	struct snd_pcm *pcm;
	int err;

	if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0)
		return err;
	pcm->private_data = emu;
	pcm->private_free = snd_emu8000_pcm_free;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops);
	emu->pcm = pcm;

	snd_device_register(card, pcm);

	return 0;
}
Commit	Line	Data
1da177e4 LT	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>
5a0e3ad6	23	#include <linux/slab.h>
1da177e4 LT	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
1da177e4	50	struct snd_emu8k_pcm {
029d64b0 TI	51	struct snd_emu8000 *emu;
029d64b0 TI	52	struct snd_pcm_substream *substream;
1da177e4 LT	53
1da177e4 LT	54	unsigned int allocated_bytes;
029d64b0	55	struct snd_util_memblk *block;
1da177e4 LT	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
029d64b0	79	emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels)
1da177e4 LT	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
029d64b0	115	snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule)
1da177e4 LT	116	{
	117	while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
	118	if (can_schedule) {
8433a509	119	schedule_timeout_interruptible(1);
1da177e4 LT	120	if (signal_pending(current))
	121	break;
	122	}
	123	}
	124	}
	125
	126	/*
	127	* close all channels
	128	*/
	129	static void
029d64b0	130	emu8k_close_dram(struct snd_emu8000 *emu)
1da177e4 LT	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
029d64b0	158	static struct snd_pcm_hardware emu8k_pcm_hw = {
1da177e4 LT	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	*/
029d64b0	182	static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch)
1da177e4 LT	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	{
029d64b0	196	struct snd_emu8k_pcm rec = (struct snd_emu8k_pcm )data;
1da177e4 LT	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	rec->timer.expires = jiffies + 1;
	211	add_timer(&rec->timer);
	212
	213	/* update period */
	214	if (rec->period_pos >= (int)rec->period_size) {
	215	rec->period_pos %= rec->period_size;
	216	spin_unlock(&rec->timer_lock);
	217	snd_pcm_period_elapsed(rec->substream);
	218	return;
	219	}
	220	spin_unlock(&rec->timer_lock);
	221	}
	222
	223
	224	/*
	225	* open pcm
	226	* creating an instance here
	227	*/
029d64b0	228	static int emu8k_pcm_open(struct snd_pcm_substream *subs)
1da177e4	229	{
029d64b0 TI	230	struct snd_emu8000 *emu = snd_pcm_substream_chip(subs);
	231	struct snd_emu8k_pcm *rec;
	232	struct snd_pcm_runtime *runtime = subs->runtime;
1da177e4	233
9e76a76e	234	rec = kzalloc(sizeof(*rec), GFP_KERNEL);
1da177e4 LT	235	if (! rec)
	236	return -ENOMEM;
	237
	238	rec->emu = emu;
	239	rec->substream = subs;
	240	runtime->private_data = rec;
	241
	242	spin_lock_init(&rec->timer_lock);
	243	init_timer(&rec->timer);
	244	rec->timer.function = emu8k_pcm_timer_func;
	245	rec->timer.data = (unsigned long)rec;
	246
	247	runtime->hw = emu8k_pcm_hw;
	248	runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
	249	runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;
	250
	251	/* use timer to update periods.. (specified in msec) */
	252	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
	253	(1000000 + HZ - 1) / HZ, UINT_MAX);
	254
	255	return 0;
	256	}
	257
029d64b0	258	static int emu8k_pcm_close(struct snd_pcm_substream *subs)
1da177e4	259	{
029d64b0	260	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
1da177e4 LT	261	kfree(rec);
	262	subs->runtime->private_data = NULL;
	263	return 0;
	264	}
	265
	266	/*
	267	* calculate pitch target
	268	*/
	269	static int calc_pitch_target(int pitch)
	270	{
	271	int ptarget = 1 << (pitch >> 12);
	272	if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
	273	if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
	274	if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
	275	ptarget += (ptarget >> 1);
	276	if (ptarget > 0xffff) ptarget = 0xffff;
	277	return ptarget;
	278	}
	279
	280	/*
	281	* set up the voice
	282	*/
029d64b0	283	static void setup_voice(struct snd_emu8k_pcm *rec, int ch)
1da177e4	284	{
029d64b0	285	struct snd_emu8000 *hw = rec->emu;
1da177e4 LT	286	unsigned int temp;
	287
	288	/* channel to be silent and idle */
	289	EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
	290	EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
	291	EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
	292	EMU8000_PTRX_WRITE(hw, ch, 0);
	293	EMU8000_CPF_WRITE(hw, ch, 0);
	294
	295	/* pitch offset */
	296	EMU8000_IP_WRITE(hw, ch, rec->pitch);
	297	/* set envelope parameters */
	298	EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
	299	EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
	300	EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
	301	EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
	302	EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
	303	/* decay/sustain parameter for volume envelope is used
	304	for triggerg the voice */
	305	/* modulation envelope heights */
	306	EMU8000_PEFE_WRITE(hw, ch, 0x0);
	307	/* lfo1/2 delay */
	308	EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
	309	EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
	310	/* lfo1 pitch & cutoff shift */
	311	EMU8000_FMMOD_WRITE(hw, ch, 0);
	312	/* lfo1 volume & freq */
	313	EMU8000_TREMFRQ_WRITE(hw, ch, 0);
	314	/* lfo2 pitch & freq */
	315	EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
	316	/* pan & loop start */
	317	temp = rec->panning[ch];
	318	temp = (temp <<24) \| ((unsigned int)rec->loop_start[ch] - 1);
	319	EMU8000_PSST_WRITE(hw, ch, temp);
	320	/* chorus & loop end (chorus 8bit, MSB) */
	321	temp = 0; // chorus
	322	temp = (temp << 24) \| ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
	323	EMU8000_CSL_WRITE(hw, ch, temp);
	324	/* Q & current address (Q 4bit value, MSB) */
	325	temp = 0; // filterQ
	326	temp = (temp << 28) \| ((unsigned int)rec->loop_start[ch] - 1);
	327	EMU8000_CCCA_WRITE(hw, ch, temp);
	328	/* clear unknown registers */
	329	EMU8000_00A0_WRITE(hw, ch, 0);
	330	EMU8000_0080_WRITE(hw, ch, 0);
	331	}
	332
	333	/*
	334	* trigger the voice
	335	*/
029d64b0	336	static void start_voice(struct snd_emu8k_pcm *rec, int ch)
1da177e4 LT	337	{
1da177e4 LT	338	unsigned long flags;
029d64b0	339	struct snd_emu8000 *hw = rec->emu;
1da177e4 LT	340	unsigned int temp, aux;
	341	int pt = calc_pitch_target(rec->pitch);
	342
	343	/* cutoff and volume */
	344	EMU8000_IFATN_WRITE(hw, ch, 0xff00);
	345	EMU8000_VTFT_WRITE(hw, ch, 0xffff);
	346	EMU8000_CVCF_WRITE(hw, ch, 0xffff);
	347	/* trigger envelope */
	348	EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
	349	/* set reverb and pitch target */
	350	temp = 0; // reverb
	351	if (rec->panning[ch] == 0)
	352	aux = 0xff;
	353	else
	354	aux = (-rec->panning[ch]) & 0xff;
	355	temp = (temp << 8) \| (pt << 16) \| aux;
	356	EMU8000_PTRX_WRITE(hw, ch, temp);
	357	EMU8000_CPF_WRITE(hw, ch, pt << 16);
	358
	359	/* start timer */
	360	spin_lock_irqsave(&rec->timer_lock, flags);
	361	if (! rec->timer_running) {
	362	rec->timer.expires = jiffies + 1;
	363	add_timer(&rec->timer);
	364	rec->timer_running = 1;
	365	}
	366	spin_unlock_irqrestore(&rec->timer_lock, flags);
	367	}
	368
	369	/*
	370	* stop the voice immediately
	371	*/
029d64b0	372	static void stop_voice(struct snd_emu8k_pcm *rec, int ch)
1da177e4 LT	373	{
1da177e4 LT	374	unsigned long flags;
029d64b0	375	struct snd_emu8000 *hw = rec->emu;
1da177e4 LT	376
	377	EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
	378
	379	/* stop timer */
	380	spin_lock_irqsave(&rec->timer_lock, flags);
	381	if (rec->timer_running) {
	382	del_timer(&rec->timer);
	383	rec->timer_running = 0;
	384	}
	385	spin_unlock_irqrestore(&rec->timer_lock, flags);
	386	}
	387
029d64b0	388	static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
1da177e4	389	{
029d64b0	390	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
1da177e4 LT	391	int ch;
	392
	393	switch (cmd) {
	394	case SNDRV_PCM_TRIGGER_START:
	395	for (ch = 0; ch < rec->voices; ch++)
	396	start_voice(rec, ch);
	397	rec->running = 1;
	398	break;
	399	case SNDRV_PCM_TRIGGER_STOP:
	400	rec->running = 0;
	401	for (ch = 0; ch < rec->voices; ch++)
	402	stop_voice(rec, ch);
	403	break;
	404	default:
	405	return -EINVAL;
	406	}
	407	return 0;
	408	}
	409
	410
	411	/*
	412	* copy / silence ops
	413	*/
	414
	415	/*
	416	* this macro should be inserted in the copy/silence loops
	417	* to reduce the latency. without this, the system will hang up
	418	* during the whole loop.
	419	*/
	420	#define CHECK_SCHEDULER() \
	421	do { \
	422	cond_resched();\
	423	if (signal_pending(current))\
	424	return -EAGAIN;\
	425	} while (0)
	426
	427
	428	#ifdef USE_NONINTERLEAVE
	429	/* copy one channel block */
029d64b0	430	static int emu8k_transfer_block(struct snd_emu8000 emu, int offset, unsigned short buf, int count)
1da177e4 LT	431	{
	432	EMU8000_SMALW_WRITE(emu, offset);
	433	while (count > 0) {
	434	unsigned short sval;
	435	CHECK_SCHEDULER();
5157cc81 KV	436	if (get_user(sval, buf))
5157cc81 KV	437	return -EFAULT;
1da177e4 LT	438	EMU8000_SMLD_WRITE(emu, sval);
	439	buf++;
	440	count--;
	441	}
	442	return 0;
	443	}
	444
029d64b0	445	static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
1da177e4 LT	446	int voice,
	447	snd_pcm_uframes_t pos,
	448	void *src,
	449	snd_pcm_uframes_t count)
	450	{
029d64b0 TI	451	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
029d64b0 TI	452	struct snd_emu8000 *emu = rec->emu;
1da177e4 LT	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 */
029d64b0	472	static int emu8k_silence_block(struct snd_emu8000 *emu, int offset, int count)
1da177e4 LT	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
029d64b0	483	static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
1da177e4 LT	484	int voice,
	485	snd_pcm_uframes_t pos,
	486	snd_pcm_uframes_t count)
	487	{
029d64b0 TI	488	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
029d64b0 TI	489	struct snd_emu8000 *emu = rec->emu;
1da177e4 LT	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	*/
029d64b0	511	static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
1da177e4 LT	512	int voice,
	513	snd_pcm_uframes_t pos,
	514	void __user *src,
	515	snd_pcm_uframes_t count)
	516	{
029d64b0 TI	517	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
029d64b0 TI	518	struct snd_emu8000 *emu = rec->emu;
1da177e4 LT	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();
5157cc81 KV	529	if (get_user(sval, buf))
5157cc81 KV	530	return -EFAULT;
1da177e4 LT	531	EMU8000_SMLD_WRITE(emu, sval);
	532	buf++;
	533	if (rec->voices > 1) {
	534	CHECK_SCHEDULER();
5157cc81 KV	535	if (get_user(sval, buf))
5157cc81 KV	536	return -EFAULT;
1da177e4 LT	537	EMU8000_SMRD_WRITE(emu, sval);
	538	buf++;
	539	}
	540	}
	541	return 0;
	542	}
	543
029d64b0	544	static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
1da177e4 LT	545	int voice,
	546	snd_pcm_uframes_t pos,
	547	snd_pcm_uframes_t count)
	548	{
029d64b0 TI	549	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
029d64b0 TI	550	struct snd_emu8000 *emu = rec->emu;
1da177e4 LT	551
	552	snd_emu8000_write_wait(emu, 1);
	553	EMU8000_SMALW_WRITE(emu, rec->loop_start[0] + pos);
	554	if (rec->voices > 1)
	555	EMU8000_SMARW_WRITE(emu, rec->loop_start[1] + pos);
	556	while (count-- > 0) {
	557	CHECK_SCHEDULER();
	558	EMU8000_SMLD_WRITE(emu, 0);
	559	if (rec->voices > 1) {
	560	CHECK_SCHEDULER();
	561	EMU8000_SMRD_WRITE(emu, 0);
	562	}
	563	}
	564	return 0;
	565	}
	566	#endif
	567
	568
	569	/*
	570	* allocate a memory block
	571	*/
029d64b0 TI	572	static int emu8k_pcm_hw_params(struct snd_pcm_substream *subs,
029d64b0 TI	573	struct snd_pcm_hw_params *hw_params)
1da177e4	574	{
029d64b0	575	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
1da177e4 LT	576
	577	if (rec->block) {
	578	/* reallocation - release the old block */
	579	snd_util_mem_free(rec->emu->memhdr, rec->block);
	580	rec->block = NULL;
	581	}
	582
	583	rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4;
	584	rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes);
	585	if (! rec->block)
	586	return -ENOMEM;
	587	rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */
	588	/* at least dma_bytes must be set for non-interleaved mode */
	589	subs->dma_buffer.bytes = params_buffer_bytes(hw_params);
	590
	591	return 0;
	592	}
	593
	594	/*
	595	* free the memory block
	596	*/
029d64b0	597	static int emu8k_pcm_hw_free(struct snd_pcm_substream *subs)
1da177e4	598	{
029d64b0	599	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
1da177e4 LT	600
	601	if (rec->block) {
	602	int ch;
	603	for (ch = 0; ch < rec->voices; ch++)
	604	stop_voice(rec, ch); // to be sure
	605	if (rec->dram_opened)
	606	emu8k_close_dram(rec->emu);
	607	snd_util_mem_free(rec->emu->memhdr, rec->block);
	608	rec->block = NULL;
	609	}
	610	return 0;
	611	}
	612
	613	/*
	614	*/
029d64b0	615	static int emu8k_pcm_prepare(struct snd_pcm_substream *subs)
1da177e4	616	{
029d64b0	617	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
1da177e4 LT	618
	619	rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate);
	620	rec->last_ptr = 0;
	621	rec->period_pos = 0;
	622
	623	rec->buf_size = subs->runtime->buffer_size;
	624	rec->period_size = subs->runtime->period_size;
	625	rec->voices = subs->runtime->channels;
	626	rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE;
	627	if (rec->voices > 1)
	628	rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE;
	629	if (rec->voices > 1) {
	630	rec->panning[0] = 0xff;
	631	rec->panning[1] = 0x00;
	632	} else
	633	rec->panning[0] = 0x80;
	634
	635	if (! rec->dram_opened) {
	636	int err, i, ch;
	637
	638	snd_emux_terminate_all(rec->emu->emu);
	639	if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0)
	640	return err;
	641	rec->dram_opened = 1;
	642
	643	/* clear loop blanks */
	644	snd_emu8000_write_wait(rec->emu, 0);
	645	EMU8000_SMALW_WRITE(rec->emu, rec->offset);
	646	for (i = 0; i < LOOP_BLANK_SIZE; i++)
	647	EMU8000_SMLD_WRITE(rec->emu, 0);
	648	for (ch = 0; ch < rec->voices; ch++) {
	649	EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size);
	650	for (i = 0; i < LOOP_BLANK_SIZE; i++)
	651	EMU8000_SMLD_WRITE(rec->emu, 0);
	652	}
	653	}
	654
	655	setup_voice(rec, 0);
	656	if (rec->voices > 1)
	657	setup_voice(rec, 1);
	658	return 0;
	659	}
	660
029d64b0	661	static snd_pcm_uframes_t emu8k_pcm_pointer(struct snd_pcm_substream *subs)
1da177e4	662	{
029d64b0	663	struct snd_emu8k_pcm *rec = subs->runtime->private_data;
1da177e4 LT	664	if (rec->running)
	665	return emu8k_get_curpos(rec, 0);
	666	return 0;
	667	}
	668
	669
029d64b0	670	static struct snd_pcm_ops emu8k_pcm_ops = {
1da177e4 LT	671	.open = emu8k_pcm_open,
	672	.close = emu8k_pcm_close,
	673	.ioctl = snd_pcm_lib_ioctl,
	674	.hw_params = emu8k_pcm_hw_params,
	675	.hw_free = emu8k_pcm_hw_free,
	676	.prepare = emu8k_pcm_prepare,
	677	.trigger = emu8k_pcm_trigger,
	678	.pointer = emu8k_pcm_pointer,
	679	.copy = emu8k_pcm_copy,
	680	.silence = emu8k_pcm_silence,
	681	};
	682
	683
029d64b0	684	static void snd_emu8000_pcm_free(struct snd_pcm *pcm)
1da177e4	685	{
029d64b0	686	struct snd_emu8000 *emu = pcm->private_data;
1da177e4 LT	687	emu->pcm = NULL;
	688	}
	689
029d64b0	690	int snd_emu8000_pcm_new(struct snd_card card, struct snd_emu8000 emu, int index)
1da177e4	691	{
029d64b0	692	struct snd_pcm *pcm;
1da177e4 LT	693	int err;
	694
	695	if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0)
	696	return err;
	697	pcm->private_data = emu;
	698	pcm->private_free = snd_emu8000_pcm_free;
	699	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops);
	700	emu->pcm = pcm;
	701
	702	snd_device_register(card, pcm);
	703
	704	return 0;
	705	}