1 files changed, 362 insertions, 0 deletions

diff --git a/sound/soc/jz4740/jz4740-pcm.c b/sound/soc/jz4740/jz4740-pcm.c
new file mode 100644
index 00000000..9b8cf256
--- /dev/null
+++ b/sound/soc/jz4740/jz4740-pcm.c
@@ -0,0 +1,362 @@
+/*
+ *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.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.
+ *
+ *  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.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.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/mach-jz4740/dma.h>
+#include "jz4740-pcm.h"
+
+struct jz4740_runtime_data {
+	unsigned long dma_period;
+	dma_addr_t dma_start;
+	dma_addr_t dma_pos;
+	dma_addr_t dma_end;
+
+	struct jz4740_dma_chan *dma;
+
+	dma_addr_t fifo_addr;
+};
+
+/* identify hardware playback capabilities */
+static const struct snd_pcm_hardware jz4740_pcm_hardware = {
+	.info = SNDRV_PCM_INFO_MMAP |
+		SNDRV_PCM_INFO_MMAP_VALID |
+		SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_BLOCK_TRANSFER,
+	.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8,
+
+	.rates			= SNDRV_PCM_RATE_8000_48000,
+	.channels_min		= 1,
+	.channels_max		= 2,
+	.period_bytes_min	= 16,
+	.period_bytes_max	= 2 * PAGE_SIZE,
+	.periods_min		= 2,
+	.periods_max		= 128,
+	.buffer_bytes_max	= 128 * 2 * PAGE_SIZE,
+	.fifo_size		= 32,
+};
+
+static void jz4740_pcm_start_transfer(struct jz4740_runtime_data *prtd,
+	struct snd_pcm_substream *substream)
+{
+	unsigned long count;
+
+	if (prtd->dma_pos == prtd->dma_end)
+		prtd->dma_pos = prtd->dma_start;
+
+	if (prtd->dma_pos + prtd->dma_period > prtd->dma_end)
+		count = prtd->dma_end - prtd->dma_pos;
+	else
+		count = prtd->dma_period;
+
+	jz4740_dma_disable(prtd->dma);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		jz4740_dma_set_src_addr(prtd->dma, prtd->dma_pos);
+		jz4740_dma_set_dst_addr(prtd->dma, prtd->fifo_addr);
+	} else {
+		jz4740_dma_set_src_addr(prtd->dma, prtd->fifo_addr);
+		jz4740_dma_set_dst_addr(prtd->dma, prtd->dma_pos);
+	}
+
+	jz4740_dma_set_transfer_count(prtd->dma, count);
+
+	prtd->dma_pos += count;
+
+	jz4740_dma_enable(prtd->dma);
+}
+
+static void jz4740_pcm_dma_transfer_done(struct jz4740_dma_chan *dma, int err,
+	void *dev_id)
+{
+	struct snd_pcm_substream *substream = dev_id;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct jz4740_runtime_data *prtd = runtime->private_data;
+
+	snd_pcm_period_elapsed(substream);
+
+	jz4740_pcm_start_transfer(prtd, substream);
+}
+
+static int jz4740_pcm_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct jz4740_runtime_data *prtd = runtime->private_data;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct jz4740_pcm_config *config;
+
+	config = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+
+	if (!config)
+		return 0;
+
+	if (!prtd->dma) {
+		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+			prtd->dma = jz4740_dma_request(substream, "PCM Capture");
+		else
+			prtd->dma = jz4740_dma_request(substream, "PCM Playback");
+	}
+
+	if (!prtd->dma)
+		return -EBUSY;
+
+	jz4740_dma_configure(prtd->dma, &config->dma_config);
+	prtd->fifo_addr = config->fifo_addr;
+
+	jz4740_dma_set_complete_cb(prtd->dma, jz4740_pcm_dma_transfer_done);
+
+	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+	runtime->dma_bytes = params_buffer_bytes(params);
+
+	prtd->dma_period = params_period_bytes(params);
+	prtd->dma_start = runtime->dma_addr;
+	prtd->dma_pos = prtd->dma_start;
+	prtd->dma_end = prtd->dma_start + runtime->dma_bytes;
+
+	return 0;
+}
+
+static int jz4740_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+	struct jz4740_runtime_data *prtd = substream->runtime->private_data;
+
+	snd_pcm_set_runtime_buffer(substream, NULL);
+	if (prtd->dma) {
+		jz4740_dma_free(prtd->dma);
+		prtd->dma = NULL;
+	}
+
+	return 0;
+}
+
+static int jz4740_pcm_prepare(struct snd_pcm_substream *substream)
+{
+	struct jz4740_runtime_data *prtd = substream->runtime->private_data;
+
+	if (!prtd->dma)
+		return -EBUSY;
+
+	prtd->dma_pos = prtd->dma_start;
+
+	return 0;
+}
+
+static int jz4740_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct jz4740_runtime_data *prtd = runtime->private_data;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		jz4740_pcm_start_transfer(prtd, substream);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		jz4740_dma_disable(prtd->dma);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static snd_pcm_uframes_t jz4740_pcm_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct jz4740_runtime_data *prtd = runtime->private_data;
+	unsigned long byte_offset;
+	snd_pcm_uframes_t offset;
+	struct jz4740_dma_chan *dma = prtd->dma;
+
+	/* prtd->dma_pos points to the end of the current transfer. So by
+	 * subtracting prdt->dma_start we get the offset to the end of the
+	 * current period in bytes. By subtracting the residue of the transfer
+	 * we get the current offset in bytes. */
+	byte_offset = prtd->dma_pos - prtd->dma_start;
+	byte_offset -= jz4740_dma_get_residue(dma);
+
+	offset = bytes_to_frames(runtime, byte_offset);
+	if (offset >= runtime->buffer_size)
+		offset = 0;
+
+	return offset;
+}
+
+static int jz4740_pcm_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct jz4740_runtime_data *prtd;
+
+	prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
+	if (prtd == NULL)
+		return -ENOMEM;
+
+	snd_soc_set_runtime_hwparams(substream, &jz4740_pcm_hardware);
+
+	runtime->private_data = prtd;
+
+	return 0;
+}
+
+static int jz4740_pcm_close(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct jz4740_runtime_data *prtd = runtime->private_data;
+
+	kfree(prtd);
+
+	return 0;
+}
+
+static int jz4740_pcm_mmap(struct snd_pcm_substream *substream,
+	struct vm_area_struct *vma)
+{
+	return remap_pfn_range(vma, vma->vm_start,
+			substream->dma_buffer.addr >> PAGE_SHIFT,
+			vma->vm_end - vma->vm_start, vma->vm_page_prot);
+}
+
+static struct snd_pcm_ops jz4740_pcm_ops = {
+	.open		= jz4740_pcm_open,
+	.close		= jz4740_pcm_close,
+	.ioctl		= snd_pcm_lib_ioctl,
+	.hw_params	= jz4740_pcm_hw_params,
+	.hw_free	= jz4740_pcm_hw_free,
+	.prepare	= jz4740_pcm_prepare,
+	.trigger	= jz4740_pcm_trigger,
+	.pointer	= jz4740_pcm_pointer,
+	.mmap		= jz4740_pcm_mmap,
+};
+
+static int jz4740_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 = jz4740_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_noncoherent(pcm->card->dev, size,
+					  &buf->addr, GFP_KERNEL);
+	if (!buf->area)
+		return -ENOMEM;
+
+	buf->bytes = size;
+
+	return 0;
+}
+
+static void jz4740_pcm_free(struct snd_pcm *pcm)
+{
+	struct snd_pcm_substream *substream;
+	struct snd_dma_buffer *buf;
+	int stream;
+
+	for (stream = 0; stream < SNDRV_PCM_STREAM_LAST; ++stream) {
+		substream = pcm->streams[stream].substream;
+		if (!substream)
+			continue;
+
+		buf = &substream->dma_buffer;
+		if (!buf->area)
+			continue;
+
+		dma_free_noncoherent(pcm->card->dev, buf->bytes, buf->area,
+				buf->addr);
+		buf->area = NULL;
+	}
+}
+
+static u64 jz4740_pcm_dmamask = DMA_BIT_MASK(32);
+
+static int jz4740_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_card *card = rtd->card->snd_card;
+	struct snd_pcm *pcm = rtd->pcm;
+	int ret = 0;
+
+	if (!card->dev->dma_mask)
+		card->dev->dma_mask = &jz4740_pcm_dmamask;
+
+	if (!card->dev->coherent_dma_mask)
+		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
+
+	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
+		ret = jz4740_pcm_preallocate_dma_buffer(pcm,
+			SNDRV_PCM_STREAM_PLAYBACK);
+		if (ret)
+			goto err;
+	}
+
+	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
+		ret = jz4740_pcm_preallocate_dma_buffer(pcm,
+			SNDRV_PCM_STREAM_CAPTURE);
+		if (ret)
+			goto err;
+	}
+
+err:
+	return ret;
+}
+
+static struct snd_soc_platform_driver jz4740_soc_platform = {
+		.ops		= &jz4740_pcm_ops,
+		.pcm_new	= jz4740_pcm_new,
+		.pcm_free	= jz4740_pcm_free,
+};
+
+static int __devinit jz4740_pcm_probe(struct platform_device *pdev)
+{
+	return snd_soc_register_platform(&pdev->dev, &jz4740_soc_platform);
+}
+
+static int __devexit jz4740_pcm_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_platform(&pdev->dev);
+	return 0;
+}
+
+static struct platform_driver jz4740_pcm_driver = {
+	.probe = jz4740_pcm_probe,
+	.remove = __devexit_p(jz4740_pcm_remove),
+	.driver = {
+		.name = "jz4740-pcm-audio",
+		.owner = THIS_MODULE,
+	},
+};
+
+module_platform_driver(jz4740_pcm_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("Ingenic SoC JZ4740 PCM driver");
+MODULE_LICENSE("GPL");