1 files changed, 389 insertions, 0 deletions
diff --git a/sound/soc/davinci/davinci-pcm.c b/sound/soc/davinci/davinci-pcm.c
new file mode 100644
index 00000000000..6a76927c997
--- /dev/null
+++ b/sound/soc/davinci/davinci-pcm.c
@@ -0,0 +1,389 @@
+/*
+ * ALSA PCM interface for the TI DAVINCI processor
+ *
+ * Author:      Vladimir Barinov, <vbarinov@ru.mvista.com>
+ * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <asm/dma.h>
+
+#include "davinci-pcm.h"
+
+#define DAVINCI_PCM_DEBUG 0
+#if DAVINCI_PCM_DEBUG
+#define DPRINTK(x...) printk(KERN_DEBUG x)
+#else
+#define DPRINTK(x...)
+#endif
+
+static struct snd_pcm_hardware davinci_pcm_hardware = {
+	.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
+		 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
+		 SNDRV_PCM_INFO_PAUSE),
+	.formats = (SNDRV_PCM_FMTBIT_S16_LE),
+	.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
+		  SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
+		  SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
+		  SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
+		  SNDRV_PCM_RATE_KNOT),
+	.rate_min = 8000,
+	.rate_max = 96000,
+	.channels_min = 2,
+	.channels_max = 2,
+	.buffer_bytes_max = 128 * 1024,
+	.period_bytes_min = 32,
+	.period_bytes_max = 8 * 1024,
+	.periods_min = 16,
+	.periods_max = 255,
+	.fifo_size = 0,
+};
+
+struct davinci_runtime_data {
+	spinlock_t lock;
+	int period;		/* current DMA period */
+	int master_lch;		/* Master DMA channel */
+	int slave_lch;		/* Slave DMA channel */
+	struct davinci_pcm_dma_params *params;	/* DMA params */
+};
+
+static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
+{
+	struct davinci_runtime_data *prtd = substream->runtime->private_data;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int lch = prtd->slave_lch;
+	unsigned int period_size;
+	unsigned int dma_offset;
+	dma_addr_t dma_pos;
+	dma_addr_t src, dst;
+	unsigned short src_bidx, dst_bidx;
+	unsigned int data_type;
+	unsigned int count;
+
+	period_size = snd_pcm_lib_period_bytes(substream);
+	dma_offset = prtd->period * period_size;
+	dma_pos = runtime->dma_addr + dma_offset;
+
+	DPRINTK("audio_set_dma_params_play channel = %d dma_ptr = %x "
+		"period_size=%x\n", lch, dma_pos, period_size);
+
+	data_type = prtd->params->data_type;
+	count = period_size / data_type;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		src = dma_pos;
+		dst = prtd->params->dma_addr;
+		src_bidx = data_type;
+		dst_bidx = 0;
+	} else {
+		src = prtd->params->dma_addr;
+		dst = dma_pos;
+		src_bidx = 0;
+		dst_bidx = data_type;
+	}
+
+	davinci_set_dma_src_params(lch, src, INCR, W8BIT);
+	davinci_set_dma_dest_params(lch, dst, INCR, W8BIT);
+	davinci_set_dma_src_index(lch, src_bidx, 0);
+	davinci_set_dma_dest_index(lch, dst_bidx, 0);
+	davinci_set_dma_transfer_params(lch, data_type, count, 1, 0, ASYNC);
+
+	prtd->period++;
+	if (unlikely(prtd->period >= runtime->periods))
+		prtd->period = 0;
+}
+
+static void davinci_pcm_dma_irq(int lch, u16 ch_status, void *data)
+{
+	struct snd_pcm_substream *substream = data;
+	struct davinci_runtime_data *prtd = substream->runtime->private_data;
+
+	DPRINTK("lch=%d, status=0x%x\n", lch, ch_status);
+
+	if (unlikely(ch_status != DMA_COMPLETE))
+		return;
+
+	if (snd_pcm_running(substream)) {
+		snd_pcm_period_elapsed(substream);
+
+		spin_lock(&prtd->lock);
+		davinci_pcm_enqueue_dma(substream);
+		spin_unlock(&prtd->lock);
+	}
+}
+
+static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
+{
+	struct davinci_runtime_data *prtd = substream->runtime->private_data;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct davinci_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data;
+	int tcc = TCC_ANY;
+	int ret;
+
+	if (!dma_data)
+		return -ENODEV;
+
+	prtd->params = dma_data;
+
+	/* Request master DMA channel */
+	ret = davinci_request_dma(prtd->params->channel, prtd->params->name,
+				  davinci_pcm_dma_irq, substream,
+				  &prtd->master_lch, &tcc, EVENTQ_0);
+	if (ret)
+		return ret;
+
+	/* Request slave DMA channel */
+	ret = davinci_request_dma(PARAM_ANY, "Link",
+				  NULL, NULL, &prtd->slave_lch, &tcc, EVENTQ_0);
+	if (ret) {
+		davinci_free_dma(prtd->master_lch);
+		return ret;
+	}
+
+	/* Link slave DMA channel in loopback */
+	davinci_dma_link_lch(prtd->slave_lch, prtd->slave_lch);
+
+	return 0;
+}
+
+static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct davinci_runtime_data *prtd = substream->runtime->private_data;
+	int ret = 0;
+
+	spin_lock(&prtd->lock);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		davinci_start_dma(prtd->master_lch);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		davinci_stop_dma(prtd->master_lch);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	spin_unlock(&prtd->lock);
+
+	return ret;
+}
+
+static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
+{
+	struct davinci_runtime_data *prtd = substream->runtime->private_data;
+	struct paramentry_descriptor temp;
+
+	prtd->period = 0;
+	davinci_pcm_enqueue_dma(substream);
+
+	/* Get slave channel dma params for master channel startup */
+	davinci_get_dma_params(prtd->slave_lch, &temp);
+	davinci_set_dma_params(prtd->master_lch, &temp);
+
+	return 0;
+}
+
+static snd_pcm_uframes_t
+davinci_pcm_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct davinci_runtime_data *prtd = runtime->private_data;
+	unsigned int offset;
+	dma_addr_t count;
+	dma_addr_t src, dst;
+
+	spin_lock(&prtd->lock);
+
+	davinci_dma_getposition(prtd->master_lch, &src, &dst);
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		count = src - runtime->dma_addr;
+	else
+		count = dst - runtime->dma_addr;;
+
+	spin_unlock(&prtd->lock);
+
+	offset = bytes_to_frames(runtime, count);
+	if (offset >= runtime->buffer_size)
+		offset = 0;
+
+	return offset;
+}
+
+static int davinci_pcm_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct davinci_runtime_data *prtd;
+	int ret = 0;
+
+	snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
+
+	prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
+	if (prtd == NULL)
+		return -ENOMEM;
+
+	spin_lock_init(&prtd->lock);
+
+	runtime->private_data = prtd;
+
+	ret = davinci_pcm_dma_request(substream);
+	if (ret) {
+		printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
+		kfree(prtd);
+	}
+
+	return ret;
+}
+
+static int davinci_pcm_close(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct davinci_runtime_data *prtd = runtime->private_data;
+
+	davinci_dma_unlink_lch(prtd->slave_lch, prtd->slave_lch);
+
+	davinci_free_dma(prtd->slave_lch);
+	davinci_free_dma(prtd->master_lch);
+
+	kfree(prtd);
+
+	return 0;
+}
+
+static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *hw_params)
+{
+	return snd_pcm_lib_malloc_pages(substream,
+					params_buffer_bytes(hw_params));
+}
+
+static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+	return snd_pcm_lib_free_pages(substream);
+}
+
+static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
+			    struct vm_area_struct *vma)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
+				     runtime->dma_area,
+				     runtime->dma_addr,
+				     runtime->dma_bytes);
+}
+
+struct snd_pcm_ops davinci_pcm_ops = {
+	.open = 	davinci_pcm_open,
+	.close = 	davinci_pcm_close,
+	.ioctl = 	snd_pcm_lib_ioctl,
+	.hw_params = 	davinci_pcm_hw_params,
+	.hw_free = 	davinci_pcm_hw_free,
+	.prepare = 	davinci_pcm_prepare,
+	.trigger = 	davinci_pcm_trigger,
+	.pointer = 	davinci_pcm_pointer,
+	.mmap = 	davinci_pcm_mmap,
+};
+
+static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
+{
+	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+	struct snd_dma_buffer *buf = &substream->dma_buffer;
+	size_t size = davinci_pcm_hardware.buffer_bytes_max;
+
+	buf->dev.type = SNDRV_DMA_TYPE_DEV;
+	buf->dev.dev = pcm->card->dev;
+	buf->private_data = NULL;
+	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
+					   &buf->addr, GFP_KERNEL);
+
+	DPRINTK("preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
+		(void *) buf->area, (void *) buf->addr, size);
+
+	if (!buf->area)
+		return -ENOMEM;
+
+	buf->bytes = size;
+	return 0;
+}
+
+static void davinci_pcm_free(struct snd_pcm *pcm)
+{
+	struct snd_pcm_substream *substream;
+	struct snd_dma_buffer *buf;
+	int stream;
+
+	for (stream = 0; stream < 2; stream++) {
+		substream = pcm->streams[stream].substream;
+		if (!substream)
+			continue;
+
+		buf = &substream->dma_buffer;
+		if (!buf->area)
+			continue;
+
+		dma_free_writecombine(pcm->card->dev, buf->bytes,
+				      buf->area, buf->addr);
+		buf->area = NULL;
+	}
+}
+
+static u64 davinci_pcm_dmamask = 0xffffffff;
+
+static int davinci_pcm_new(struct snd_card *card,
+			   struct snd_soc_codec_dai *dai, struct snd_pcm *pcm)
+{
+	int ret;
+
+	if (!card->dev->dma_mask)
+		card->dev->dma_mask = &davinci_pcm_dmamask;
+	if (!card->dev->coherent_dma_mask)
+		card->dev->coherent_dma_mask = 0xffffffff;
+
+	if (dai->playback.channels_min) {
+		ret = davinci_pcm_preallocate_dma_buffer(pcm,
+			SNDRV_PCM_STREAM_PLAYBACK);
+		if (ret)
+			return ret;
+	}
+
+	if (dai->capture.channels_min) {
+		ret = davinci_pcm_preallocate_dma_buffer(pcm,
+			SNDRV_PCM_STREAM_CAPTURE);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+struct snd_soc_platform davinci_soc_platform = {
+	.name = 	"davinci-audio",
+	.pcm_ops = 	&davinci_pcm_ops,
+	.pcm_new = 	davinci_pcm_new,
+	.pcm_free = 	davinci_pcm_free,
+};
+EXPORT_SYMBOL_GPL(davinci_soc_platform);
+
+MODULE_AUTHOR("Vladimir Barinov");
+MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
+MODULE_LICENSE("GPL");