Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 924 insertions, 0 deletions

diff --git a/sound/isa/gus/gus_pcm.c b/sound/isa/gus/gus_pcm.c
new file mode 100644
index 000000000..131b28997
--- /dev/null
+++ b/sound/isa/gus/gus_pcm.c
@@ -0,0 +1,924 @@
+/*
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ *  Routines for control of GF1 chip (PCM things)
+ *
+ *  InterWave chips supports interleaved DMA, but this feature isn't used in
+ *  this code.
+ *  
+ *  This code emulates autoinit DMA transfer for playback, recording by GF1
+ *  chip doesn't support autoinit DMA.
+ *
+ *
+ *   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 <asm/dma.h>
+#include <linux/slab.h>
+#include <linux/sched/signal.h>
+
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/gus.h>
+#include <sound/pcm_params.h>
+#include "gus_tables.h"
+
+/* maximum rate */
+
+#define SNDRV_GF1_PCM_RATE		48000
+
+#define SNDRV_GF1_PCM_PFLG_NONE		0
+#define SNDRV_GF1_PCM_PFLG_ACTIVE	(1<<0)
+#define SNDRV_GF1_PCM_PFLG_NEUTRAL	(2<<0)
+
+struct gus_pcm_private {
+	struct snd_gus_card * gus;
+	struct snd_pcm_substream *substream;
+	spinlock_t lock;
+	unsigned int voices;
+	struct snd_gus_voice *pvoices[2];
+	unsigned int memory;
+	unsigned short flags;
+	unsigned char voice_ctrl, ramp_ctrl;
+	unsigned int bpos;
+	unsigned int blocks;
+	unsigned int block_size;
+	unsigned int dma_size;
+	wait_queue_head_t sleep;
+	atomic_t dma_count;
+	int final_volume;
+};
+
+static void snd_gf1_pcm_block_change_ack(struct snd_gus_card * gus, void *private_data)
+{
+	struct gus_pcm_private *pcmp = private_data;
+
+	if (pcmp) {
+		atomic_dec(&pcmp->dma_count);
+		wake_up(&pcmp->sleep);
+	}
+}
+
+static int snd_gf1_pcm_block_change(struct snd_pcm_substream *substream,
+				    unsigned int offset,
+				    unsigned int addr,
+				    unsigned int count)
+{
+	struct snd_gf1_dma_block block;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct gus_pcm_private *pcmp = runtime->private_data;
+
+	count += offset & 31;
+	offset &= ~31;
+	/*
+	snd_printk(KERN_DEBUG "block change - offset = 0x%x, count = 0x%x\n",
+		   offset, count);
+	*/
+	memset(&block, 0, sizeof(block));
+	block.cmd = SNDRV_GF1_DMA_IRQ;
+	if (snd_pcm_format_unsigned(runtime->format))
+		block.cmd |= SNDRV_GF1_DMA_UNSIGNED;
+	if (snd_pcm_format_width(runtime->format) == 16)
+		block.cmd |= SNDRV_GF1_DMA_16BIT;
+	block.addr = addr & ~31;
+	block.buffer = runtime->dma_area + offset;
+	block.buf_addr = runtime->dma_addr + offset;
+	block.count = count;
+	block.private_data = pcmp;
+	block.ack = snd_gf1_pcm_block_change_ack;
+	if (!snd_gf1_dma_transfer_block(pcmp->gus, &block, 0, 0))
+		atomic_inc(&pcmp->dma_count);
+	return 0;
+}
+
+static void snd_gf1_pcm_trigger_up(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct gus_pcm_private *pcmp = runtime->private_data;
+	struct snd_gus_card * gus = pcmp->gus;
+	unsigned long flags;
+	unsigned char voice_ctrl, ramp_ctrl;
+	unsigned short rate;
+	unsigned int curr, begin, end;
+	unsigned short vol;
+	unsigned char pan;
+	unsigned int voice;
+
+	spin_lock_irqsave(&pcmp->lock, flags);
+	if (pcmp->flags & SNDRV_GF1_PCM_PFLG_ACTIVE) {
+		spin_unlock_irqrestore(&pcmp->lock, flags);
+		return;
+	}
+	pcmp->flags |= SNDRV_GF1_PCM_PFLG_ACTIVE;
+	pcmp->final_volume = 0;
+	spin_unlock_irqrestore(&pcmp->lock, flags);
+	rate = snd_gf1_translate_freq(gus, runtime->rate << 4);
+	/* enable WAVE IRQ */
+	voice_ctrl = snd_pcm_format_width(runtime->format) == 16 ? 0x24 : 0x20;
+	/* enable RAMP IRQ + rollover */
+	ramp_ctrl = 0x24;
+	if (pcmp->blocks == 1) {
+		voice_ctrl |= 0x08;	/* loop enable */
+		ramp_ctrl &= ~0x04;	/* disable rollover */
+	}
+	for (voice = 0; voice < pcmp->voices; voice++) {
+		begin = pcmp->memory + voice * (pcmp->dma_size / runtime->channels);
+		curr = begin + (pcmp->bpos * pcmp->block_size) / runtime->channels;
+		end = curr + (pcmp->block_size / runtime->channels);
+		end -= snd_pcm_format_width(runtime->format) == 16 ? 2 : 1;
+		/*
+		snd_printk(KERN_DEBUG "init: curr=0x%x, begin=0x%x, end=0x%x, "
+			   "ctrl=0x%x, ramp=0x%x, rate=0x%x\n",
+			   curr, begin, end, voice_ctrl, ramp_ctrl, rate);
+		*/
+		pan = runtime->channels == 2 ? (!voice ? 1 : 14) : 8;
+		vol = !voice ? gus->gf1.pcm_volume_level_left : gus->gf1.pcm_volume_level_right;
+		spin_lock_irqsave(&gus->reg_lock, flags);
+		snd_gf1_select_voice(gus, pcmp->pvoices[voice]->number);
+		snd_gf1_write8(gus, SNDRV_GF1_VB_PAN, pan);
+		snd_gf1_write16(gus, SNDRV_GF1_VW_FREQUENCY, rate);
+		snd_gf1_write_addr(gus, SNDRV_GF1_VA_START, begin << 4, voice_ctrl & 4);
+		snd_gf1_write_addr(gus, SNDRV_GF1_VA_END, end << 4, voice_ctrl & 4);
+		snd_gf1_write_addr(gus, SNDRV_GF1_VA_CURRENT, curr << 4, voice_ctrl & 4);
+		snd_gf1_write16(gus, SNDRV_GF1_VW_VOLUME, SNDRV_GF1_MIN_VOLUME << 4);
+		snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_RATE, 0x2f);
+		snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_START, SNDRV_GF1_MIN_OFFSET);
+		snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_END, vol >> 8);
+		snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_CONTROL, ramp_ctrl);
+		if (!gus->gf1.enh_mode) {
+			snd_gf1_delay(gus);
+			snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_CONTROL, ramp_ctrl);
+		}
+		spin_unlock_irqrestore(&gus->reg_lock, flags);
+	}
+	spin_lock_irqsave(&gus->reg_lock, flags);
+	for (voice = 0; voice < pcmp->voices; voice++) {
+		snd_gf1_select_voice(gus, pcmp->pvoices[voice]->number);
+		if (gus->gf1.enh_mode)
+			snd_gf1_write8(gus, SNDRV_GF1_VB_MODE, 0x00);	/* deactivate voice */
+		snd_gf1_write8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL, voice_ctrl);
+		voice_ctrl &= ~0x20;
+	}
+	voice_ctrl |= 0x20;
+	if (!gus->gf1.enh_mode) {
+		snd_gf1_delay(gus);
+		for (voice = 0; voice < pcmp->voices; voice++) {
+			snd_gf1_select_voice(gus, pcmp->pvoices[voice]->number);
+			snd_gf1_write8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL, voice_ctrl);
+			voice_ctrl &= ~0x20;	/* disable IRQ for next voice */
+		}
+	}
+	spin_unlock_irqrestore(&gus->reg_lock, flags);
+}
+
+static void snd_gf1_pcm_interrupt_wave(struct snd_gus_card * gus,
+				       struct snd_gus_voice *pvoice)
+{
+	struct gus_pcm_private * pcmp;
+	struct snd_pcm_runtime *runtime;
+	unsigned char voice_ctrl, ramp_ctrl;
+	unsigned int idx;
+	unsigned int end, step;
+
+	if (!pvoice->private_data) {
+		snd_printd("snd_gf1_pcm: unknown wave irq?\n");
+		snd_gf1_smart_stop_voice(gus, pvoice->number);
+		return;
+	}
+	pcmp = pvoice->private_data;
+	if (pcmp == NULL) {
+		snd_printd("snd_gf1_pcm: unknown wave irq?\n");
+		snd_gf1_smart_stop_voice(gus, pvoice->number);
+		return;
+	}		
+	gus = pcmp->gus;
+	runtime = pcmp->substream->runtime;
+
+	spin_lock(&gus->reg_lock);
+	snd_gf1_select_voice(gus, pvoice->number);
+	voice_ctrl = snd_gf1_read8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL) & ~0x8b;
+	ramp_ctrl = (snd_gf1_read8(gus, SNDRV_GF1_VB_VOLUME_CONTROL) & ~0xa4) | 0x03;
+#if 0
+	snd_gf1_select_voice(gus, pvoice->number);
+	printk(KERN_DEBUG "position = 0x%x\n",
+	       (snd_gf1_read_addr(gus, SNDRV_GF1_VA_CURRENT, voice_ctrl & 4) >> 4));
+	snd_gf1_select_voice(gus, pcmp->pvoices[1]->number);
+	printk(KERN_DEBUG "position = 0x%x\n",
+	       (snd_gf1_read_addr(gus, SNDRV_GF1_VA_CURRENT, voice_ctrl & 4) >> 4));
+	snd_gf1_select_voice(gus, pvoice->number);
+#endif
+	pcmp->bpos++;
+	pcmp->bpos %= pcmp->blocks;
+	if (pcmp->bpos + 1 >= pcmp->blocks) {	/* last block? */
+		voice_ctrl |= 0x08;	/* enable loop */
+	} else {
+		ramp_ctrl |= 0x04;	/* enable rollover */
+	}
+	end = pcmp->memory + (((pcmp->bpos + 1) * pcmp->block_size) / runtime->channels);
+	end -= voice_ctrl & 4 ? 2 : 1;
+	step = pcmp->dma_size / runtime->channels;
+	voice_ctrl |= 0x20;
+	if (!pcmp->final_volume) {
+		ramp_ctrl |= 0x20;
+		ramp_ctrl &= ~0x03;
+	}
+	for (idx = 0; idx < pcmp->voices; idx++, end += step) {
+		snd_gf1_select_voice(gus, pcmp->pvoices[idx]->number);
+		snd_gf1_write_addr(gus, SNDRV_GF1_VA_END, end << 4, voice_ctrl & 4);
+		snd_gf1_write8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL, voice_ctrl);
+		snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_CONTROL, ramp_ctrl);
+		voice_ctrl &= ~0x20;
+	}
+	if (!gus->gf1.enh_mode) {
+		snd_gf1_delay(gus);
+		voice_ctrl |= 0x20;
+		for (idx = 0; idx < pcmp->voices; idx++) {
+			snd_gf1_select_voice(gus, pcmp->pvoices[idx]->number);
+			snd_gf1_write8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL, voice_ctrl);
+			snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_CONTROL, ramp_ctrl);
+			voice_ctrl &= ~0x20;
+		}
+	}
+	spin_unlock(&gus->reg_lock);
+
+	snd_pcm_period_elapsed(pcmp->substream);
+#if 0
+	if ((runtime->flags & SNDRV_PCM_FLG_MMAP) &&
+	    *runtime->state == SNDRV_PCM_STATE_RUNNING) {
+		end = pcmp->bpos * pcmp->block_size;
+		if (runtime->channels > 1) {
+			snd_gf1_pcm_block_change(pcmp->substream, end, pcmp->memory + (end / 2), pcmp->block_size / 2);
+			snd_gf1_pcm_block_change(pcmp->substream, end + (pcmp->block_size / 2), pcmp->memory + (pcmp->dma_size / 2) + (end / 2), pcmp->block_size / 2);
+		} else {
+			snd_gf1_pcm_block_change(pcmp->substream, end, pcmp->memory + end, pcmp->block_size);
+		}
+	}
+#endif
+}
+
+static void snd_gf1_pcm_interrupt_volume(struct snd_gus_card * gus,
+					 struct snd_gus_voice * pvoice)
+{
+	unsigned short vol;
+	int cvoice;
+	struct gus_pcm_private *pcmp = pvoice->private_data;
+
+	/* stop ramp, but leave rollover bit untouched */
+	spin_lock(&gus->reg_lock);
+	snd_gf1_select_voice(gus, pvoice->number);
+	snd_gf1_ctrl_stop(gus, SNDRV_GF1_VB_VOLUME_CONTROL);
+	spin_unlock(&gus->reg_lock);
+	if (pcmp == NULL)
+		return;
+	/* are we active? */
+	if (!(pcmp->flags & SNDRV_GF1_PCM_PFLG_ACTIVE))
+		return;
+	/* load real volume - better precision */
+	cvoice = pcmp->pvoices[0] == pvoice ? 0 : 1;
+	if (pcmp->substream == NULL)
+		return;
+	vol = !cvoice ? gus->gf1.pcm_volume_level_left : gus->gf1.pcm_volume_level_right;
+	spin_lock(&gus->reg_lock);
+	snd_gf1_select_voice(gus, pvoice->number);
+	snd_gf1_write16(gus, SNDRV_GF1_VW_VOLUME, vol);
+	pcmp->final_volume = 1;
+	spin_unlock(&gus->reg_lock);
+}
+
+static void snd_gf1_pcm_volume_change(struct snd_gus_card * gus)
+{
+}
+
+static int snd_gf1_pcm_poke_block(struct snd_gus_card *gus, unsigned char *buf,
+				  unsigned int pos, unsigned int count,
+				  int w16, int invert)
+{
+	unsigned int len;
+	unsigned long flags;
+
+	/*
+	printk(KERN_DEBUG
+	       "poke block; buf = 0x%x, pos = %i, count = %i, port = 0x%x\n",
+	       (int)buf, pos, count, gus->gf1.port);
+	*/
+	while (count > 0) {
+		len = count;
+		if (len > 512)		/* limit, to allow IRQ */
+			len = 512;
+		count -= len;
+		if (gus->interwave) {
+			spin_lock_irqsave(&gus->reg_lock, flags);
+			snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01 | (invert ? 0x08 : 0x00));
+			snd_gf1_dram_addr(gus, pos);
+			if (w16) {
+				outb(SNDRV_GF1_GW_DRAM_IO16, GUSP(gus, GF1REGSEL));
+				outsw(GUSP(gus, GF1DATALOW), buf, len >> 1);
+			} else {
+				outsb(GUSP(gus, DRAM), buf, len);
+			}
+			spin_unlock_irqrestore(&gus->reg_lock, flags);
+			buf += 512;
+			pos += 512;
+		} else {
+			invert = invert ? 0x80 : 0x00;
+			if (w16) {
+				len >>= 1;
+				while (len--) {
+					snd_gf1_poke(gus, pos++, *buf++);
+					snd_gf1_poke(gus, pos++, *buf++ ^ invert);
+				}
+			} else {
+				while (len--)
+					snd_gf1_poke(gus, pos++, *buf++ ^ invert);
+			}
+		}
+		if (count > 0 && !in_interrupt()) {
+			schedule_timeout_interruptible(1);
+			if (signal_pending(current))
+				return -EAGAIN;
+		}
+	}
+	return 0;
+}
+
+static int get_bpos(struct gus_pcm_private *pcmp, int voice, unsigned int pos,
+		    unsigned int len)
+{
+	unsigned int bpos = pos + (voice * (pcmp->dma_size / 2));
+	if (snd_BUG_ON(bpos > pcmp->dma_size))
+		return -EIO;
+	if (snd_BUG_ON(bpos + len > pcmp->dma_size))
+		return -EIO;
+	return bpos;
+}
+
+static int playback_copy_ack(struct snd_pcm_substream *substream,
+			     unsigned int bpos, unsigned int len)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct gus_pcm_private *pcmp = runtime->private_data;
+	struct snd_gus_card *gus = pcmp->gus;
+	int w16, invert;
+
+	if (len > 32)
+		return snd_gf1_pcm_block_change(substream, bpos,
+						pcmp->memory + bpos, len);
+
+	w16 = (snd_pcm_format_width(runtime->format) == 16);
+	invert = snd_pcm_format_unsigned(runtime->format);
+	return snd_gf1_pcm_poke_block(gus, runtime->dma_area + bpos,
+				      pcmp->memory + bpos, len, w16, invert);
+}
+
+static int snd_gf1_pcm_playback_copy(struct snd_pcm_substream *substream,
+				     int voice, unsigned long pos,
+				     void __user *src, unsigned long count)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct gus_pcm_private *pcmp = runtime->private_data;
+	unsigned int len = count;
+	int bpos;
+
+	bpos = get_bpos(pcmp, voice, pos, len);
+	if (bpos < 0)
+		return pos;
+	if (copy_from_user(runtime->dma_area + bpos, src, len))
+		return -EFAULT;
+	return playback_copy_ack(substream, bpos, len);
+}
+
+static int snd_gf1_pcm_playback_copy_kernel(struct snd_pcm_substream *substream,
+					    int voice, unsigned long pos,
+					    void *src, unsigned long count)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct gus_pcm_private *pcmp = runtime->private_data;
+	unsigned int len = count;
+	int bpos;
+
+	bpos = get_bpos(pcmp, voice, pos, len);
+	if (bpos < 0)
+		return pos;
+	memcpy(runtime->dma_area + bpos, src, len);
+	return playback_copy_ack(substream, bpos, len);
+}
+
+static int snd_gf1_pcm_playback_silence(struct snd_pcm_substream *substream,
+					int voice, unsigned long pos,
+					unsigned long count)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct gus_pcm_private *pcmp = runtime->private_data;
+	unsigned int len = count;
+	int bpos;
+	
+	bpos = get_bpos(pcmp, voice, pos, len);
+	if (bpos < 0)
+		return pos;
+	snd_pcm_format_set_silence(runtime->format, runtime->dma_area + bpos,
+				   bytes_to_samples(runtime, count));
+	return playback_copy_ack(substream, bpos, len);
+}
+
+static int snd_gf1_pcm_playback_hw_params(struct snd_pcm_substream *substream,
+					  struct snd_pcm_hw_params *hw_params)
+{
+	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct gus_pcm_private *pcmp = runtime->private_data;
+	int err;
+	
+	if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
+		return err;
+	if (err > 0) {	/* change */
+		struct snd_gf1_mem_block *block;
+		if (pcmp->memory > 0) {
+			snd_gf1_mem_free(&gus->gf1.mem_alloc, pcmp->memory);
+			pcmp->memory = 0;
+		}
+		if ((block = snd_gf1_mem_alloc(&gus->gf1.mem_alloc,
+		                               SNDRV_GF1_MEM_OWNER_DRIVER,
+					       "GF1 PCM",
+		                               runtime->dma_bytes, 1, 32,
+		                               NULL)) == NULL)
+			return -ENOMEM;
+		pcmp->memory = block->ptr;
+	}
+	pcmp->voices = params_channels(hw_params);
+	if (pcmp->pvoices[0] == NULL) {
+		if ((pcmp->pvoices[0] = snd_gf1_alloc_voice(pcmp->gus, SNDRV_GF1_VOICE_TYPE_PCM, 0, 0)) == NULL)
+			return -ENOMEM;
+		pcmp->pvoices[0]->handler_wave = snd_gf1_pcm_interrupt_wave;
+		pcmp->pvoices[0]->handler_volume = snd_gf1_pcm_interrupt_volume;
+		pcmp->pvoices[0]->volume_change = snd_gf1_pcm_volume_change;
+		pcmp->pvoices[0]->private_data = pcmp;
+	}
+	if (pcmp->voices > 1 && pcmp->pvoices[1] == NULL) {
+		if ((pcmp->pvoices[1] = snd_gf1_alloc_voice(pcmp->gus, SNDRV_GF1_VOICE_TYPE_PCM, 0, 0)) == NULL)
+			return -ENOMEM;
+		pcmp->pvoices[1]->handler_wave = snd_gf1_pcm_interrupt_wave;
+		pcmp->pvoices[1]->handler_volume = snd_gf1_pcm_interrupt_volume;
+		pcmp->pvoices[1]->volume_change = snd_gf1_pcm_volume_change;
+		pcmp->pvoices[1]->private_data = pcmp;
+	} else if (pcmp->voices == 1) {
+		if (pcmp->pvoices[1]) {
+			snd_gf1_free_voice(pcmp->gus, pcmp->pvoices[1]);
+			pcmp->pvoices[1] = NULL;
+		}
+	}
+	return 0;
+}
+
+static int snd_gf1_pcm_playback_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct gus_pcm_private *pcmp = runtime->private_data;
+
+	snd_pcm_lib_free_pages(substream);
+	if (pcmp->pvoices[0]) {
+		snd_gf1_free_voice(pcmp->gus, pcmp->pvoices[0]);
+		pcmp->pvoices[0] = NULL;
+	}
+	if (pcmp->pvoices[1]) {
+		snd_gf1_free_voice(pcmp->gus, pcmp->pvoices[1]);
+		pcmp->pvoices[1] = NULL;
+	}
+	if (pcmp->memory > 0) {
+		snd_gf1_mem_free(&pcmp->gus->gf1.mem_alloc, pcmp->memory);
+		pcmp->memory = 0;
+	}
+	return 0;
+}
+
+static int snd_gf1_pcm_playback_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct gus_pcm_private *pcmp = runtime->private_data;
+
+	pcmp->bpos = 0;
+	pcmp->dma_size = snd_pcm_lib_buffer_bytes(substream);
+	pcmp->block_size = snd_pcm_lib_period_bytes(substream);
+	pcmp->blocks = pcmp->dma_size / pcmp->block_size;
+	return 0;
+}
+
+static int snd_gf1_pcm_playback_trigger(struct snd_pcm_substream *substream,
+					int cmd)
+{
+	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct gus_pcm_private *pcmp = runtime->private_data;
+	int voice;
+
+	if (cmd == SNDRV_PCM_TRIGGER_START) {
+		snd_gf1_pcm_trigger_up(substream);
+	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
+		spin_lock(&pcmp->lock);
+		pcmp->flags &= ~SNDRV_GF1_PCM_PFLG_ACTIVE;
+		spin_unlock(&pcmp->lock);
+		voice = pcmp->pvoices[0]->number;
+		snd_gf1_stop_voices(gus, voice, voice);
+		if (pcmp->pvoices[1]) {
+			voice = pcmp->pvoices[1]->number;
+			snd_gf1_stop_voices(gus, voice, voice);
+		}
+	} else {
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static snd_pcm_uframes_t snd_gf1_pcm_playback_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct gus_pcm_private *pcmp = runtime->private_data;
+	unsigned int pos;
+	unsigned char voice_ctrl;
+
+	pos = 0;
+	spin_lock(&gus->reg_lock);
+	if (pcmp->flags & SNDRV_GF1_PCM_PFLG_ACTIVE) {
+		snd_gf1_select_voice(gus, pcmp->pvoices[0]->number);
+		voice_ctrl = snd_gf1_read8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL);
+		pos = (snd_gf1_read_addr(gus, SNDRV_GF1_VA_CURRENT, voice_ctrl & 4) >> 4) - pcmp->memory;
+		if (substream->runtime->channels > 1)
+			pos <<= 1;
+		pos = bytes_to_frames(runtime, pos);
+	}
+	spin_unlock(&gus->reg_lock);
+	return pos;
+}
+
+static const struct snd_ratnum clock = {
+	.num = 9878400/16,
+	.den_min = 2,
+	.den_max = 257,
+	.den_step = 1,
+};
+
+static const struct snd_pcm_hw_constraint_ratnums hw_constraints_clocks  = {
+	.nrats = 1,
+	.rats = &clock,
+};
+
+static int snd_gf1_pcm_capture_hw_params(struct snd_pcm_substream *substream,
+					 struct snd_pcm_hw_params *hw_params)
+{
+	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
+
+	gus->c_dma_size = params_buffer_bytes(hw_params);
+	gus->c_period_size = params_period_bytes(hw_params);
+	gus->c_pos = 0;
+	gus->gf1.pcm_rcntrl_reg = 0x21;		/* IRQ at end, enable & start */
+	if (params_channels(hw_params) > 1)
+		gus->gf1.pcm_rcntrl_reg |= 2;
+	if (gus->gf1.dma2 > 3)
+		gus->gf1.pcm_rcntrl_reg |= 4;
+	if (snd_pcm_format_unsigned(params_format(hw_params)))
+		gus->gf1.pcm_rcntrl_reg |= 0x80;
+	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
+}
+
+static int snd_gf1_pcm_capture_hw_free(struct snd_pcm_substream *substream)
+{
+	return snd_pcm_lib_free_pages(substream);
+}
+
+static int snd_gf1_pcm_capture_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	snd_gf1_i_write8(gus, SNDRV_GF1_GB_RECORD_RATE, runtime->rate_den - 2);
+	snd_gf1_i_write8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL, 0);	/* disable sampling */
+	snd_gf1_i_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL);	/* Sampling Control Register */
+	snd_dma_program(gus->gf1.dma2, runtime->dma_addr, gus->c_period_size, DMA_MODE_READ);
+	return 0;
+}
+
+static int snd_gf1_pcm_capture_trigger(struct snd_pcm_substream *substream,
+				       int cmd)
+{
+	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
+	int val;
+	
+	if (cmd == SNDRV_PCM_TRIGGER_START) {
+		val = gus->gf1.pcm_rcntrl_reg;
+	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
+		val = 0;
+	} else {
+		return -EINVAL;
+	}
+
+	spin_lock(&gus->reg_lock);
+	snd_gf1_write8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL, val);
+	snd_gf1_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL);
+	spin_unlock(&gus->reg_lock);
+	return 0;
+}
+
+static snd_pcm_uframes_t snd_gf1_pcm_capture_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
+	int pos = snd_dma_pointer(gus->gf1.dma2, gus->c_period_size);
+	pos = bytes_to_frames(substream->runtime, (gus->c_pos + pos) % gus->c_dma_size);
+	return pos;
+}
+
+static void snd_gf1_pcm_interrupt_dma_read(struct snd_gus_card * gus)
+{
+	snd_gf1_i_write8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL, 0);	/* disable sampling */
+	snd_gf1_i_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL);	/* Sampling Control Register */
+	if (gus->pcm_cap_substream != NULL) {
+		snd_gf1_pcm_capture_prepare(gus->pcm_cap_substream); 
+		snd_gf1_pcm_capture_trigger(gus->pcm_cap_substream, SNDRV_PCM_TRIGGER_START);
+		gus->c_pos += gus->c_period_size;
+		snd_pcm_period_elapsed(gus->pcm_cap_substream);
+	}
+}
+
+static const struct snd_pcm_hardware snd_gf1_pcm_playback =
+{
+	.info =			SNDRV_PCM_INFO_NONINTERLEAVED,
+	.formats		= (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
+				 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE),
+	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
+	.rate_min =		5510,
+	.rate_max =		48000,
+	.channels_min =		1,
+	.channels_max =		2,
+	.buffer_bytes_max =	(128*1024),
+	.period_bytes_min =	64,
+	.period_bytes_max =	(128*1024),
+	.periods_min =		1,
+	.periods_max =		1024,
+	.fifo_size =		0,
+};
+
+static const struct snd_pcm_hardware snd_gf1_pcm_capture =
+{
+	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
+				 SNDRV_PCM_INFO_MMAP_VALID),
+	.formats =		SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8,
+	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_44100,
+	.rate_min =		5510,
+	.rate_max =		44100,
+	.channels_min =		1,
+	.channels_max =		2,
+	.buffer_bytes_max =	(128*1024),
+	.period_bytes_min =	64,
+	.period_bytes_max =	(128*1024),
+	.periods_min =		1,
+	.periods_max =		1024,
+	.fifo_size =		0,
+};
+
+static void snd_gf1_pcm_playback_free(struct snd_pcm_runtime *runtime)
+{
+	kfree(runtime->private_data);
+}
+
+static int snd_gf1_pcm_playback_open(struct snd_pcm_substream *substream)
+{
+	struct gus_pcm_private *pcmp;
+	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int err;
+
+	pcmp = kzalloc(sizeof(*pcmp), GFP_KERNEL);
+	if (pcmp == NULL)
+		return -ENOMEM;
+	pcmp->gus = gus;
+	spin_lock_init(&pcmp->lock);
+	init_waitqueue_head(&pcmp->sleep);
+	atomic_set(&pcmp->dma_count, 0);
+
+	runtime->private_data = pcmp;
+	runtime->private_free = snd_gf1_pcm_playback_free;
+
+#if 0
+	printk(KERN_DEBUG "playback.buffer = 0x%lx, gf1.pcm_buffer = 0x%lx\n",
+	       (long) pcm->playback.buffer, (long) gus->gf1.pcm_buffer);
+#endif
+	if ((err = snd_gf1_dma_init(gus)) < 0)
+		return err;
+	pcmp->flags = SNDRV_GF1_PCM_PFLG_NONE;
+	pcmp->substream = substream;
+	runtime->hw = snd_gf1_pcm_playback;
+	snd_pcm_limit_isa_dma_size(gus->gf1.dma1, &runtime->hw.buffer_bytes_max);
+	snd_pcm_limit_isa_dma_size(gus->gf1.dma1, &runtime->hw.period_bytes_max);
+	snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 64);
+	return 0;
+}
+
+static int snd_gf1_pcm_playback_close(struct snd_pcm_substream *substream)
+{
+	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct gus_pcm_private *pcmp = runtime->private_data;
+	
+	if (!wait_event_timeout(pcmp->sleep, (atomic_read(&pcmp->dma_count) <= 0), 2*HZ))
+		snd_printk(KERN_ERR "gf1 pcm - serious DMA problem\n");
+
+	snd_gf1_dma_done(gus);	
+	return 0;
+}
+
+static int snd_gf1_pcm_capture_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
+
+	gus->gf1.interrupt_handler_dma_read = snd_gf1_pcm_interrupt_dma_read;
+	gus->pcm_cap_substream = substream;
+	substream->runtime->hw = snd_gf1_pcm_capture;
+	snd_pcm_limit_isa_dma_size(gus->gf1.dma2, &runtime->hw.buffer_bytes_max);
+	snd_pcm_limit_isa_dma_size(gus->gf1.dma2, &runtime->hw.period_bytes_max);
+	snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+				      &hw_constraints_clocks);
+	return 0;
+}
+
+static int snd_gf1_pcm_capture_close(struct snd_pcm_substream *substream)
+{
+	struct snd_gus_card *gus = snd_pcm_substream_chip(substream);
+
+	gus->pcm_cap_substream = NULL;
+	snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_DMA_READ);
+	return 0;
+}
+
+static int snd_gf1_pcm_volume_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 2;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 127;
+	return 0;
+}
+
+static int snd_gf1_pcm_volume_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_gus_card *gus = snd_kcontrol_chip(kcontrol);
+	unsigned long flags;
+	
+	spin_lock_irqsave(&gus->pcm_volume_level_lock, flags);
+	ucontrol->value.integer.value[0] = gus->gf1.pcm_volume_level_left1;
+	ucontrol->value.integer.value[1] = gus->gf1.pcm_volume_level_right1;
+	spin_unlock_irqrestore(&gus->pcm_volume_level_lock, flags);
+	return 0;
+}
+
+static int snd_gf1_pcm_volume_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_gus_card *gus = snd_kcontrol_chip(kcontrol);
+	unsigned long flags;
+	int change;
+	unsigned int idx;
+	unsigned short val1, val2, vol;
+	struct gus_pcm_private *pcmp;
+	struct snd_gus_voice *pvoice;
+	
+	val1 = ucontrol->value.integer.value[0] & 127;
+	val2 = ucontrol->value.integer.value[1] & 127;
+	spin_lock_irqsave(&gus->pcm_volume_level_lock, flags);
+	change = val1 != gus->gf1.pcm_volume_level_left1 ||
+	         val2 != gus->gf1.pcm_volume_level_right1;
+	gus->gf1.pcm_volume_level_left1 = val1;
+	gus->gf1.pcm_volume_level_right1 = val2;
+	gus->gf1.pcm_volume_level_left = snd_gf1_lvol_to_gvol_raw(val1 << 9) << 4;
+	gus->gf1.pcm_volume_level_right = snd_gf1_lvol_to_gvol_raw(val2 << 9) << 4;
+	spin_unlock_irqrestore(&gus->pcm_volume_level_lock, flags);
+	/* are we active? */
+	spin_lock_irqsave(&gus->voice_alloc, flags);
+	for (idx = 0; idx < 32; idx++) {
+		pvoice = &gus->gf1.voices[idx];
+		if (!pvoice->pcm)
+			continue;
+		pcmp = pvoice->private_data;
+		if (!(pcmp->flags & SNDRV_GF1_PCM_PFLG_ACTIVE))
+			continue;
+		/* load real volume - better precision */
+		spin_lock(&gus->reg_lock);
+		snd_gf1_select_voice(gus, pvoice->number);
+		snd_gf1_ctrl_stop(gus, SNDRV_GF1_VB_VOLUME_CONTROL);
+		vol = pvoice == pcmp->pvoices[0] ? gus->gf1.pcm_volume_level_left : gus->gf1.pcm_volume_level_right;
+		snd_gf1_write16(gus, SNDRV_GF1_VW_VOLUME, vol);
+		pcmp->final_volume = 1;
+		spin_unlock(&gus->reg_lock);
+	}
+	spin_unlock_irqrestore(&gus->voice_alloc, flags);
+	return change;
+}
+
+static const struct snd_kcontrol_new snd_gf1_pcm_volume_control =
+{
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "PCM Playback Volume",
+	.info = snd_gf1_pcm_volume_info,
+	.get = snd_gf1_pcm_volume_get,
+	.put = snd_gf1_pcm_volume_put
+};
+
+static const struct snd_kcontrol_new snd_gf1_pcm_volume_control1 =
+{
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "GPCM Playback Volume",
+	.info = snd_gf1_pcm_volume_info,
+	.get = snd_gf1_pcm_volume_get,
+	.put = snd_gf1_pcm_volume_put
+};
+
+static const struct snd_pcm_ops snd_gf1_pcm_playback_ops = {
+	.open =		snd_gf1_pcm_playback_open,
+	.close =	snd_gf1_pcm_playback_close,
+	.ioctl =	snd_pcm_lib_ioctl,
+	.hw_params =	snd_gf1_pcm_playback_hw_params,
+	.hw_free =	snd_gf1_pcm_playback_hw_free,
+	.prepare =	snd_gf1_pcm_playback_prepare,
+	.trigger =	snd_gf1_pcm_playback_trigger,
+	.pointer =	snd_gf1_pcm_playback_pointer,
+	.copy_user =	snd_gf1_pcm_playback_copy,
+	.copy_kernel =	snd_gf1_pcm_playback_copy_kernel,
+	.fill_silence =	snd_gf1_pcm_playback_silence,
+};
+
+static const struct snd_pcm_ops snd_gf1_pcm_capture_ops = {
+	.open =		snd_gf1_pcm_capture_open,
+	.close =	snd_gf1_pcm_capture_close,
+	.ioctl =	snd_pcm_lib_ioctl,
+	.hw_params =	snd_gf1_pcm_capture_hw_params,
+	.hw_free =	snd_gf1_pcm_capture_hw_free,
+	.prepare =	snd_gf1_pcm_capture_prepare,
+	.trigger =	snd_gf1_pcm_capture_trigger,
+	.pointer =	snd_gf1_pcm_capture_pointer,
+};
+
+int snd_gf1_pcm_new(struct snd_gus_card *gus, int pcm_dev, int control_index)
+{
+	struct snd_card *card;
+	struct snd_kcontrol *kctl;
+	struct snd_pcm *pcm;
+	struct snd_pcm_substream *substream;
+	int capture, err;
+
+	card = gus->card;
+	capture = !gus->interwave && !gus->ess_flag && !gus->ace_flag ? 1 : 0;
+	err = snd_pcm_new(card,
+			  gus->interwave ? "AMD InterWave" : "GF1",
+			  pcm_dev,
+			  gus->gf1.pcm_channels / 2,
+			  capture,
+			  &pcm);
+	if (err < 0)
+		return err;
+	pcm->private_data = gus;
+	/* playback setup */
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_gf1_pcm_playback_ops);
+
+	for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next)
+		snd_pcm_lib_preallocate_pages(substream, SNDRV_DMA_TYPE_DEV,
+					      snd_dma_isa_data(),
+					      64*1024, gus->gf1.dma1 > 3 ? 128*1024 : 64*1024);
+	
+	pcm->info_flags = 0;
+	pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
+	if (capture) {
+		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_gf1_pcm_capture_ops);
+		if (gus->gf1.dma2 == gus->gf1.dma1)
+			pcm->info_flags |= SNDRV_PCM_INFO_HALF_DUPLEX;
+		snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
+					      SNDRV_DMA_TYPE_DEV, snd_dma_isa_data(),
+					      64*1024, gus->gf1.dma2 > 3 ? 128*1024 : 64*1024);
+	}
+	strcpy(pcm->name, pcm->id);
+	if (gus->interwave) {
+		sprintf(pcm->name + strlen(pcm->name), " rev %c", gus->revision + 'A');
+	}
+	strcat(pcm->name, " (synth)");
+	gus->pcm = pcm;
+
+	if (gus->codec_flag)
+		kctl = snd_ctl_new1(&snd_gf1_pcm_volume_control1, gus);
+	else
+		kctl = snd_ctl_new1(&snd_gf1_pcm_volume_control, gus);
+	if ((err = snd_ctl_add(card, kctl)) < 0)
+		return err;
+	kctl->id.index = control_index;
+
+	return 0;
+}
+