1 files changed, 465 insertions, 0 deletions

diff --git a/sound/soc/samsung/dma.c b/sound/soc/samsung/dma.c
new file mode 100644
index 00000000..ddc6cde1
--- /dev/null
+++ b/sound/soc/samsung/dma.c
@@ -0,0 +1,465 @@
+/*
+ * dma.c  --  ALSA Soc Audio Layer
+ *
+ * (c) 2006 Wolfson Microelectronics PLC.
+ * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
+ *
+ * Copyright 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 <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+
+#include <asm/dma.h>
+#include <mach/hardware.h>
+#include <mach/dma.h>
+
+#include "dma.h"
+
+#define ST_RUNNING		(1<<0)
+#define ST_OPENED		(1<<1)
+
+static const struct snd_pcm_hardware dma_hardware = {
+	.info			= SNDRV_PCM_INFO_INTERLEAVED |
+				    SNDRV_PCM_INFO_BLOCK_TRANSFER |
+				    SNDRV_PCM_INFO_MMAP |
+				    SNDRV_PCM_INFO_MMAP_VALID |
+				    SNDRV_PCM_INFO_PAUSE |
+				    SNDRV_PCM_INFO_RESUME,
+	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
+				    SNDRV_PCM_FMTBIT_U16_LE |
+				    SNDRV_PCM_FMTBIT_U8 |
+				    SNDRV_PCM_FMTBIT_S8,
+	.channels_min		= 2,
+	.channels_max		= 2,
+	.buffer_bytes_max	= 128*1024,
+	.period_bytes_min	= PAGE_SIZE,
+	.period_bytes_max	= PAGE_SIZE*2,
+	.periods_min		= 2,
+	.periods_max		= 128,
+	.fifo_size		= 32,
+};
+
+struct runtime_data {
+	spinlock_t lock;
+	int state;
+	unsigned int dma_loaded;
+	unsigned int dma_period;
+	dma_addr_t dma_start;
+	dma_addr_t dma_pos;
+	dma_addr_t dma_end;
+	struct s3c_dma_params *params;
+};
+
+static void audio_buffdone(void *data);
+
+/* dma_enqueue
+ *
+ * place a dma buffer onto the queue for the dma system
+ * to handle.
+ */
+static void dma_enqueue(struct snd_pcm_substream *substream)
+{
+	struct runtime_data *prtd = substream->runtime->private_data;
+	dma_addr_t pos = prtd->dma_pos;
+	unsigned int limit;
+	struct samsung_dma_prep_info dma_info;
+
+	pr_debug("Entered %s\n", __func__);
+
+	limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
+
+	pr_debug("%s: loaded %d, limit %d\n",
+				__func__, prtd->dma_loaded, limit);
+
+	dma_info.cap = (samsung_dma_has_circular() ? DMA_CYCLIC : DMA_SLAVE);
+	dma_info.direction =
+		(substream->stream == SNDRV_PCM_STREAM_PLAYBACK
+		? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
+	dma_info.fp = audio_buffdone;
+	dma_info.fp_param = substream;
+	dma_info.period = prtd->dma_period;
+	dma_info.len = prtd->dma_period*limit;
+
+	while (prtd->dma_loaded < limit) {
+		pr_debug("dma_loaded: %d\n", prtd->dma_loaded);
+
+		if ((pos + dma_info.period) > prtd->dma_end) {
+			dma_info.period  = prtd->dma_end - pos;
+			pr_debug("%s: corrected dma len %ld\n",
+					__func__, dma_info.period);
+		}
+
+		dma_info.buf = pos;
+		prtd->params->ops->prepare(prtd->params->ch, &dma_info);
+
+		prtd->dma_loaded++;
+		pos += prtd->dma_period;
+		if (pos >= prtd->dma_end)
+			pos = prtd->dma_start;
+	}
+
+	prtd->dma_pos = pos;
+}
+
+static void audio_buffdone(void *data)
+{
+	struct snd_pcm_substream *substream = data;
+	struct runtime_data *prtd = substream->runtime->private_data;
+
+	pr_debug("Entered %s\n", __func__);
+
+	if (prtd->state & ST_RUNNING) {
+		prtd->dma_pos += prtd->dma_period;
+		if (prtd->dma_pos >= prtd->dma_end)
+			prtd->dma_pos = prtd->dma_start;
+
+		if (substream)
+			snd_pcm_period_elapsed(substream);
+
+		spin_lock(&prtd->lock);
+		if (!samsung_dma_has_circular()) {
+			prtd->dma_loaded--;
+			dma_enqueue(substream);
+		}
+		spin_unlock(&prtd->lock);
+	}
+}
+
+static int dma_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct runtime_data *prtd = runtime->private_data;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	unsigned long totbytes = params_buffer_bytes(params);
+	struct s3c_dma_params *dma =
+		snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+	struct samsung_dma_info dma_info;
+
+	pr_debug("Entered %s\n", __func__);
+
+	/* return if this is a bufferless transfer e.g.
+	 * codec <--> BT codec or GSM modem -- lg FIXME */
+	if (!dma)
+		return 0;
+
+	/* this may get called several times by oss emulation
+	 * with different params -HW */
+	if (prtd->params == NULL) {
+		/* prepare DMA */
+		prtd->params = dma;
+
+		pr_debug("params %p, client %p, channel %d\n", prtd->params,
+			prtd->params->client, prtd->params->channel);
+
+		prtd->params->ops = samsung_dma_get_ops();
+
+		dma_info.cap = (samsung_dma_has_circular() ?
+			DMA_CYCLIC : DMA_SLAVE);
+		dma_info.client = prtd->params->client;
+		dma_info.direction =
+			(substream->stream == SNDRV_PCM_STREAM_PLAYBACK
+			? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
+		dma_info.width = prtd->params->dma_size;
+		dma_info.fifo = prtd->params->dma_addr;
+		prtd->params->ch = prtd->params->ops->request(
+				prtd->params->channel, &dma_info);
+	}
+
+	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+
+	runtime->dma_bytes = totbytes;
+
+	spin_lock_irq(&prtd->lock);
+	prtd->dma_loaded = 0;
+	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 + totbytes;
+	spin_unlock_irq(&prtd->lock);
+
+	return 0;
+}
+
+static int dma_hw_free(struct snd_pcm_substream *substream)
+{
+	struct runtime_data *prtd = substream->runtime->private_data;
+
+	pr_debug("Entered %s\n", __func__);
+
+	snd_pcm_set_runtime_buffer(substream, NULL);
+
+	if (prtd->params) {
+		prtd->params->ops->flush(prtd->params->ch);
+		prtd->params->ops->release(prtd->params->ch,
+					prtd->params->client);
+		prtd->params = NULL;
+	}
+
+	return 0;
+}
+
+static int dma_prepare(struct snd_pcm_substream *substream)
+{
+	struct runtime_data *prtd = substream->runtime->private_data;
+	int ret = 0;
+
+	pr_debug("Entered %s\n", __func__);
+
+	/* return if this is a bufferless transfer e.g.
+	 * codec <--> BT codec or GSM modem -- lg FIXME */
+	if (!prtd->params)
+		return 0;
+
+	/* flush the DMA channel */
+	prtd->params->ops->flush(prtd->params->ch);
+
+	prtd->dma_loaded = 0;
+	prtd->dma_pos = prtd->dma_start;
+
+	/* enqueue dma buffers */
+	dma_enqueue(substream);
+
+	return ret;
+}
+
+static int dma_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct runtime_data *prtd = substream->runtime->private_data;
+	int ret = 0;
+
+	pr_debug("Entered %s\n", __func__);
+
+	spin_lock(&prtd->lock);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		prtd->state |= ST_RUNNING;
+		prtd->params->ops->trigger(prtd->params->ch);
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		prtd->state &= ~ST_RUNNING;
+		prtd->params->ops->stop(prtd->params->ch);
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	spin_unlock(&prtd->lock);
+
+	return ret;
+}
+
+static snd_pcm_uframes_t
+dma_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct runtime_data *prtd = runtime->private_data;
+	unsigned long res;
+
+	pr_debug("Entered %s\n", __func__);
+
+	res = prtd->dma_pos - prtd->dma_start;
+
+	pr_debug("Pointer offset: %lu\n", res);
+
+	/* we seem to be getting the odd error from the pcm library due
+	 * to out-of-bounds pointers. this is maybe due to the dma engine
+	 * not having loaded the new values for the channel before being
+	 * called... (todo - fix )
+	 */
+
+	if (res >= snd_pcm_lib_buffer_bytes(substream)) {
+		if (res == snd_pcm_lib_buffer_bytes(substream))
+			res = 0;
+	}
+
+	return bytes_to_frames(substream->runtime, res);
+}
+
+static int dma_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct runtime_data *prtd;
+
+	pr_debug("Entered %s\n", __func__);
+
+	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+	snd_soc_set_runtime_hwparams(substream, &dma_hardware);
+
+	prtd = kzalloc(sizeof(struct runtime_data), GFP_KERNEL);
+	if (prtd == NULL)
+		return -ENOMEM;
+
+	spin_lock_init(&prtd->lock);
+
+	runtime->private_data = prtd;
+	return 0;
+}
+
+static int dma_close(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct runtime_data *prtd = runtime->private_data;
+
+	pr_debug("Entered %s\n", __func__);
+
+	if (!prtd)
+		pr_debug("dma_close called with prtd == NULL\n");
+
+	kfree(prtd);
+
+	return 0;
+}
+
+static int dma_mmap(struct snd_pcm_substream *substream,
+	struct vm_area_struct *vma)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	pr_debug("Entered %s\n", __func__);
+
+	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
+				     runtime->dma_area,
+				     runtime->dma_addr,
+				     runtime->dma_bytes);
+}
+
+static struct snd_pcm_ops dma_ops = {
+	.open		= dma_open,
+	.close		= dma_close,
+	.ioctl		= snd_pcm_lib_ioctl,
+	.hw_params	= dma_hw_params,
+	.hw_free	= dma_hw_free,
+	.prepare	= dma_prepare,
+	.trigger	= dma_trigger,
+	.pointer	= dma_pointer,
+	.mmap		= dma_mmap,
+};
+
+static int 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 = dma_hardware.buffer_bytes_max;
+
+	pr_debug("Entered %s\n", __func__);
+
+	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);
+	if (!buf->area)
+		return -ENOMEM;
+	buf->bytes = size;
+	return 0;
+}
+
+static void dma_free_dma_buffers(struct snd_pcm *pcm)
+{
+	struct snd_pcm_substream *substream;
+	struct snd_dma_buffer *buf;
+	int stream;
+
+	pr_debug("Entered %s\n", __func__);
+
+	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 dma_mask = DMA_BIT_MASK(32);
+
+static int dma_new(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_card *card = rtd->card->snd_card;
+	struct snd_pcm *pcm = rtd->pcm;
+	int ret = 0;
+
+	pr_debug("Entered %s\n", __func__);
+
+	if (!card->dev->dma_mask)
+		card->dev->dma_mask = &dma_mask;
+	if (!card->dev->coherent_dma_mask)
+		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
+
+	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
+		ret = preallocate_dma_buffer(pcm,
+			SNDRV_PCM_STREAM_PLAYBACK);
+		if (ret)
+			goto out;
+	}
+
+	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
+		ret = preallocate_dma_buffer(pcm,
+			SNDRV_PCM_STREAM_CAPTURE);
+		if (ret)
+			goto out;
+	}
+out:
+	return ret;
+}
+
+static struct snd_soc_platform_driver samsung_asoc_platform = {
+	.ops		= &dma_ops,
+	.pcm_new	= dma_new,
+	.pcm_free	= dma_free_dma_buffers,
+};
+
+static int __devinit samsung_asoc_platform_probe(struct platform_device *pdev)
+{
+	return snd_soc_register_platform(&pdev->dev, &samsung_asoc_platform);
+}
+
+static int __devexit samsung_asoc_platform_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_platform(&pdev->dev);
+	return 0;
+}
+
+static struct platform_driver asoc_dma_driver = {
+	.driver = {
+		.name = "samsung-audio",
+		.owner = THIS_MODULE,
+	},
+
+	.probe = samsung_asoc_platform_probe,
+	.remove = __devexit_p(samsung_asoc_platform_remove),
+};
+
+module_platform_driver(asoc_dma_driver);
+
+MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
+MODULE_DESCRIPTION("Samsung ASoC DMA Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:samsung-audio");