1 files changed, 432 insertions, 0 deletions

diff --git a/sound/soc/tegra/tegra_pcm.c b/sound/soc/tegra/tegra_pcm.c
new file mode 100644
index 000000000000..1bddb5547c3c
--- /dev/null
+++ b/sound/soc/tegra/tegra_pcm.c
@@ -0,0 +1,432 @@
+/*
+ * tegra_pcm.c  --  ALSA Soc Audio Layer
+ *
+ * (c) 2010 Nvidia Graphics Pvt. Ltd.
+ *  http://www.nvidia.com
+ *
+ * (c) 2006 Wolfson Microelectronics PLC.
+ * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
+ *
+ * (c) 2004-2005 Simtec Electronics
+ *    http://armlinux.simtec.co.uk/
+ *    Ben Dooks <ben@simtec.co.uk>
+ *
+ *  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.
+ */
+
+#include "tegra_soc.h"
+#include <mach/tegra_das.h>
+
+#define PLAYBACK_STARTED true
+#define PLAYBACK_STOPPED false
+
+static void tegra_pcm_play(struct tegra_runtime_data *prtd)
+{
+	static int reqid = 0;
+	struct snd_pcm_substream *substream = prtd->substream;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_dma_buffer *buf = &substream->dma_buffer;
+
+	if (runtime->dma_addr) {
+		prtd->size = frames_to_bytes(runtime, runtime->period_size);
+		if (reqid == 0) {
+			if (prtd->dma_state != STATE_ABORT) {
+				prtd->dma_req1.source_addr = buf->addr +
+				frames_to_bytes(runtime,prtd->dma_pos);
+				prtd->dma_req1.size = prtd->size;
+				tegra_dma_enqueue_req(prtd->dma_chan,
+							&prtd->dma_req1);
+				reqid = 1;
+			}
+		} else {
+			if (prtd->dma_state != STATE_ABORT) {
+				prtd->dma_req2.source_addr = buf->addr +
+				frames_to_bytes(runtime,prtd->dma_pos);
+				prtd->dma_req2.size = prtd->size;
+				tegra_dma_enqueue_req(prtd->dma_chan,
+							&prtd->dma_req2);
+				reqid = 0;
+			}
+		}
+	}
+
+	prtd->dma_pos += runtime->period_size;
+	if (prtd->dma_pos >= runtime->buffer_size) {
+		prtd->dma_pos = 0;
+	}
+
+}
+
+static void tegra_pcm_capture(struct tegra_runtime_data *prtd)
+{
+	static int reqid = 0;
+	struct snd_pcm_substream *substream = prtd->substream;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_dma_buffer *buf = &substream->dma_buffer;
+
+	if (runtime->dma_addr) {
+		prtd->size = frames_to_bytes(runtime, runtime->period_size);
+		if (reqid == 0) {
+			if (prtd->dma_state != STATE_ABORT) {
+				prtd->dma_req1.dest_addr = buf->addr +
+				frames_to_bytes(runtime,prtd->dma_pos);
+				prtd->dma_req1.size = prtd->size;
+				tegra_dma_enqueue_req(prtd->dma_chan,
+							&prtd->dma_req1);
+				reqid = 1;
+			}
+		} else {
+			if (prtd->dma_state != STATE_ABORT) {
+				prtd->dma_req2.dest_addr = buf->addr +
+				frames_to_bytes(runtime,prtd->dma_pos);
+				prtd->dma_req2.size = prtd->size;
+				tegra_dma_enqueue_req(prtd->dma_chan,
+							&prtd->dma_req2);
+				reqid = 0;
+			}
+		}
+	}
+
+	prtd->dma_pos += runtime->period_size;
+	if (prtd->dma_pos >= runtime->buffer_size) {
+		prtd->dma_pos = 0;
+	}
+
+}
+
+static void dma_complete_callback (struct tegra_dma_req *req)
+{
+	struct tegra_runtime_data *prtd = (struct tegra_runtime_data *)req->dev;
+	struct snd_pcm_substream *substream = prtd->substream;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	if (++prtd->period_index >= runtime->periods) {
+		prtd->period_index = 0;
+	}
+
+	if (prtd->dma_state != STATE_ABORT) {
+		snd_pcm_period_elapsed(substream);
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			tegra_pcm_play(prtd);
+		} else {
+			tegra_pcm_capture(prtd);
+		}
+	}
+}
+
+static const struct snd_pcm_hardware tegra_pcm_hardware = {
+	.info 	= SNDRV_PCM_INFO_INTERLEAVED | \
+			SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME | \
+			SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID ,
+	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
+	.channels_min		= 1,
+	.channels_max		= 2,
+	.buffer_bytes_max	= (PAGE_SIZE * 8),
+	.period_bytes_min	= 1024,
+	.period_bytes_max	= (PAGE_SIZE),
+	.periods_min		= 2,
+	.periods_max		= 8,
+	.fifo_size 		= 4,
+};
+
+static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params)
+{
+	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+	return 0;
+}
+
+static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+	snd_pcm_set_runtime_buffer(substream, NULL);
+	return 0;
+}
+
+static int tegra_pcm_prepare(struct snd_pcm_substream *substream)
+{
+	struct tegra_runtime_data *prtd = substream->runtime->private_data;
+
+	prtd->dma_pos = 0;
+	prtd->period_index = 0;
+
+	return 0;
+}
+
+static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct tegra_runtime_data *prtd = substream->runtime->private_data;
+	int ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			prtd->state = STATE_INIT;
+			prtd->dma_state = STATE_INIT;
+			tegra_pcm_play(prtd); /* dma enqueue req1 */
+			tegra_pcm_play(prtd); /* dma enqueue req2 */
+		} else if (prtd->state != STATE_INIT) {
+			/* start recording */
+			prtd->state = STATE_INIT;
+			prtd->dma_state = STATE_INIT;
+			tegra_pcm_capture(prtd); /* dma enqueue req1 */
+			tegra_pcm_capture(prtd); /* dma enqueue req2 */
+		}
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		prtd->state = STATE_ABORT;
+		prtd->dma_state = STATE_ABORT;
+		tegra_dma_cancel(prtd->dma_chan);
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			if (prtd->dma_chan) {
+				tegra_dma_dequeue_req(prtd->dma_chan,
+							&prtd->dma_req1);
+				tegra_dma_dequeue_req(prtd->dma_chan,
+							&prtd->dma_req2);
+			}
+		} else {
+			if (prtd->dma_chan) {
+				tegra_dma_dequeue_req(prtd->dma_chan,
+							&prtd->dma_req1);
+				tegra_dma_dequeue_req(prtd->dma_chan,
+							&prtd->dma_req2);
+			}
+		}
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct tegra_runtime_data *prtd = runtime->private_data;
+	int size;
+	size = prtd->period_index * runtime->period_size;
+	return (size);
+}
+
+static int tegra_pcm_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct tegra_runtime_data *prtd;
+	int ret=0;
+
+	prtd = kzalloc(sizeof(struct tegra_runtime_data), GFP_KERNEL);
+	if (prtd == NULL)
+		return -ENOMEM;
+
+	memset(prtd, 0, sizeof(*prtd));
+	runtime->private_data = prtd;
+	prtd->substream = substream;
+
+	/* set pins state to normal */
+	tegra_das_power_mode(true);
+
+	prtd->state = STATE_INVALID;
+
+	setup_dma_request(substream,
+			&prtd->dma_req1,
+			dma_complete_callback,
+			prtd);
+
+	setup_dma_request(substream,
+			&prtd->dma_req2,
+			dma_complete_callback,
+			prtd);
+
+	prtd->dma_chan = tegra_dma_allocate_channel(TEGRA_DMA_MODE_CONTINUOUS_DOUBLE);
+	if (IS_ERR(prtd->dma_chan)) {
+		pr_err("%s: could not allocate DMA channel for I2S: %ld\n",
+		       __func__, PTR_ERR(prtd->dma_chan));
+		ret = PTR_ERR(prtd->dma_chan);
+		goto fail;
+	}
+
+	/* Set HW params now that initialization is complete */
+	snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
+
+	goto end;
+
+fail:
+	prtd->state = STATE_EXIT;
+
+	if (prtd->dma_chan) {
+		tegra_dma_flush(prtd->dma_chan);
+		tegra_dma_free_channel(prtd->dma_chan);
+	}
+
+	/* set pins state to tristate */
+	tegra_das_power_mode(false);
+
+	kfree(prtd);
+
+end:
+	return ret;
+}
+
+static int tegra_pcm_close(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct tegra_runtime_data *prtd = runtime->private_data;
+
+	if (!prtd) {
+		printk(KERN_ERR "tegra_pcm_close called with prtd == NULL\n");
+		return 0;
+	}
+
+	prtd->state = STATE_EXIT;
+
+	if (prtd->dma_chan) {
+		prtd->dma_state = STATE_EXIT;
+		tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req1);
+		tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req2);
+		tegra_dma_flush(prtd->dma_chan);
+		tegra_dma_free_channel(prtd->dma_chan);
+		prtd->dma_chan = NULL;
+	}
+
+	/* set pins state to tristate */
+	tegra_das_power_mode(false);
+
+	kfree(prtd);
+
+	return 0;
+}
+
+static int tegra_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);
+}
+
+static struct snd_pcm_ops tegra_pcm_ops = {
+	.open       = tegra_pcm_open,
+	.close      = tegra_pcm_close,
+	.ioctl      = snd_pcm_lib_ioctl,
+	.hw_params  = tegra_pcm_hw_params,
+	.hw_free    = tegra_pcm_hw_free,
+	.prepare    = tegra_pcm_prepare,
+	.trigger    = tegra_pcm_trigger,
+	.pointer    = tegra_pcm_pointer,
+	.mmap       = tegra_pcm_mmap,
+};
+
+static int tegra_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 = tegra_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);
+	buf->bytes = size;
+	return 0;
+}
+
+static void tegra_pcm_deallocate_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;
+
+	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 void tegra_pcm_free_dma_buffers(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;
+		buf = &substream->dma_buffer;
+		if (!buf) {
+			printk(KERN_ERR "no buffer %d \n",stream);
+			continue;
+		}
+		tegra_pcm_deallocate_dma_buffer(pcm ,stream);
+	}
+
+}
+
+static u64 tegra_dma_mask = DMA_BIT_MASK(32);
+
+static int tegra_pcm_new(struct snd_card *card,
+				struct snd_soc_dai *dai, struct snd_pcm *pcm)
+{
+	int ret = 0;
+
+	if (!card->dev->dma_mask)
+		card->dev->dma_mask = &tegra_dma_mask;
+	if (!card->dev->coherent_dma_mask)
+		card->dev->coherent_dma_mask = 0xffffffff;
+
+	if (dai->playback.channels_min) {
+		ret = tegra_pcm_preallocate_dma_buffer(pcm,
+						SNDRV_PCM_STREAM_PLAYBACK);
+		if (ret)
+			goto out;
+	}
+
+	if (dai->capture.channels_min) {
+		ret = tegra_pcm_preallocate_dma_buffer(pcm,
+						SNDRV_PCM_STREAM_CAPTURE);
+		if (ret)
+			goto out;
+	}
+out:
+	return ret;
+}
+
+struct snd_soc_platform tegra_soc_platform = {
+	.name     = "tegra-audio",
+	.pcm_ops  = &tegra_pcm_ops,
+	.pcm_new  = tegra_pcm_new,
+	.pcm_free = tegra_pcm_free_dma_buffers,
+};
+EXPORT_SYMBOL_GPL(tegra_soc_platform);
+
+static int __init tegra_soc_platform_init(void)
+{
+	return snd_soc_register_platform(&tegra_soc_platform);
+}
+module_init(tegra_soc_platform_init);
+
+static void __exit tegra_soc_platform_exit(void)
+{
+	snd_soc_unregister_platform(&tegra_soc_platform);
+}
+module_exit(tegra_soc_platform_exit);
+
+MODULE_DESCRIPTION("Tegra PCM DMA module");
+MODULE_LICENSE("GPL");