[linux-2.6-block.git] / sound / soc / kirkwood / kirkwood-dma.c

/*
 * kirkwood-dma.c
 *
 * (c) 2010 Arnaud Patard <apatard@mandriva.com>
 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
 *
 *  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/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/mbus.h>
#include <sound/soc.h>
#include "kirkwood.h"

#define KIRKWOOD_RATES \
	(SNDRV_PCM_RATE_8000_192000 |		\
	 SNDRV_PCM_RATE_CONTINUOUS |		\
	 SNDRV_PCM_RATE_KNOT)

#define KIRKWOOD_FORMATS \
	(SNDRV_PCM_FMTBIT_S16_LE | \
	 SNDRV_PCM_FMTBIT_S24_LE | \
	 SNDRV_PCM_FMTBIT_S32_LE)

static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
{
	struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
	return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
}

static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
	.info = (SNDRV_PCM_INFO_INTERLEAVED |
		 SNDRV_PCM_INFO_MMAP |
		 SNDRV_PCM_INFO_MMAP_VALID |
		 SNDRV_PCM_INFO_BLOCK_TRANSFER |
		 SNDRV_PCM_INFO_PAUSE),
	.formats		= KIRKWOOD_FORMATS,
	.rates			= KIRKWOOD_RATES,
	.rate_min		= 8000,
	.rate_max		= 384000,
	.channels_min		= 1,
	.channels_max		= 8,
	.buffer_bytes_max	= KIRKWOOD_SND_MAX_BUFFER_BYTES,
	.period_bytes_min	= KIRKWOOD_SND_MIN_PERIOD_BYTES,
	.period_bytes_max	= KIRKWOOD_SND_MAX_PERIOD_BYTES,
	.periods_min		= KIRKWOOD_SND_MIN_PERIODS,
	.periods_max		= KIRKWOOD_SND_MAX_PERIODS,
	.fifo_size		= 0,
};

static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32);

static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
{
	struct kirkwood_dma_data *priv = dev_id;
	unsigned long mask, status, cause;

	mask = readl(priv->io + KIRKWOOD_INT_MASK);
	status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;

	cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
	if (unlikely(cause)) {
		printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
				__func__, cause);
		writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
	}

	/* we've enabled only bytes interrupts ... */
	if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
			KIRKWOOD_INT_CAUSE_REC_BYTES)) {
		printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
			__func__, status);
		return IRQ_NONE;
	}

	/* ack int */
	writel(status, priv->io + KIRKWOOD_INT_CAUSE);

	if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
		snd_pcm_period_elapsed(priv->substream_play);

	if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
		snd_pcm_period_elapsed(priv->substream_rec);

	return IRQ_HANDLED;
}

static void
kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
			       unsigned long dma,
			       const struct mbus_dram_target_info *dram)
{
	int i;

	/* First disable and clear windows */
	writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
	writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));

	/* try to find matching cs for current dma address */
	for (i = 0; i < dram->num_cs; i++) {
		const struct mbus_dram_window *cs = dram->cs + i;
		if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
			writel(cs->base & 0xffff0000,
				base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
			writel(((cs->size - 1) & 0xffff0000) |
				(cs->mbus_attr << 8) |
				(dram->mbus_dram_target_id << 4) | 1,
				base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
		}
	}
}

static int kirkwood_dma_open(struct snd_pcm_substream *substream)
{
	int err;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
	const struct mbus_dram_target_info *dram;
	unsigned long addr;

	snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);

	/* Ensure that all constraints linked to dma burst are fulfilled */
	err = snd_pcm_hw_constraint_minmax(runtime,
			SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
			priv->burst * 2,
			KIRKWOOD_AUDIO_BUF_MAX-1);
	if (err < 0)
		return err;

	err = snd_pcm_hw_constraint_step(runtime, 0,
			SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
			priv->burst);
	if (err < 0)
		return err;

	err = snd_pcm_hw_constraint_step(substream->runtime, 0,
			 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
			 priv->burst);
	if (err < 0)
		return err;

	if (!priv->substream_play && !priv->substream_rec) {
		err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
				  "kirkwood-i2s", priv);
		if (err)
			return -EBUSY;

		/*
		 * Enable Error interrupts. We're only ack'ing them but
		 * it's useful for diagnostics
		 */
		writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
	}

	dram = mv_mbus_dram_info();
	addr = substream->dma_buffer.addr;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		priv->substream_play = substream;
		kirkwood_dma_conf_mbus_windows(priv->io,
			KIRKWOOD_PLAYBACK_WIN, addr, dram);
	} else {
		priv->substream_rec = substream;
		kirkwood_dma_conf_mbus_windows(priv->io,
			KIRKWOOD_RECORD_WIN, addr, dram);
	}

	return 0;
}

static int kirkwood_dma_close(struct snd_pcm_substream *substream)
{
	struct kirkwood_dma_data *priv = kirkwood_priv(substream);

	if (!priv)
		return 0;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		priv->substream_play = NULL;
	else
		priv->substream_rec = NULL;

	if (!priv->substream_play && !priv->substream_rec) {
		writel(0, priv->io + KIRKWOOD_ERR_MASK);
		free_irq(priv->irq, priv);
	}

	return 0;
}

static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = params_buffer_bytes(params);

	return 0;
}

static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
{
	snd_pcm_set_runtime_buffer(substream, NULL);
	return 0;
}

static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
	unsigned long size, count;

	/* compute buffer size in term of "words" as requested in specs */
	size = frames_to_bytes(runtime, runtime->buffer_size);
	size = (size>>2)-1;
	count = snd_pcm_lib_period_bytes(substream);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
		writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
		writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
	} else {
		writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
		writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
		writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
	}


	return 0;
}

static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
						*substream)
{
	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
	snd_pcm_uframes_t count;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		count = bytes_to_frames(substream->runtime,
			readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
	else
		count = bytes_to_frames(substream->runtime,
			readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));

	return count;
}

static struct snd_pcm_ops kirkwood_dma_ops = {
	.open =		kirkwood_dma_open,
	.close =        kirkwood_dma_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	kirkwood_dma_hw_params,
	.hw_free =      kirkwood_dma_hw_free,
	.prepare =      kirkwood_dma_prepare,
	.pointer =	kirkwood_dma_pointer,
};

static int kirkwood_dma_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 = kirkwood_dma_snd_hw.buffer_bytes_max;

	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = pcm->card->dev;
	buf->area = dma_alloc_coherent(pcm->card->dev, size,
			&buf->addr, GFP_KERNEL);
	if (!buf->area)
		return -ENOMEM;
	buf->bytes = size;
	buf->private_data = NULL;

	return 0;
}

static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;
	int ret;

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &kirkwood_dma_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 = kirkwood_dma_preallocate_dma_buffer(pcm,
				SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			return ret;
	}

	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
		ret = kirkwood_dma_preallocate_dma_buffer(pcm,
				SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			return ret;
	}

	return 0;
}

static void kirkwood_dma_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;
		if (!substream)
			continue;
		buf = &substream->dma_buffer;
		if (!buf->area)
			continue;

		dma_free_coherent(pcm->card->dev, buf->bytes,
				buf->area, buf->addr);
		buf->area = NULL;
	}
}

struct snd_soc_platform_driver kirkwood_soc_platform = {
	.ops		= &kirkwood_dma_ops,
	.pcm_new	= kirkwood_dma_new,
	.pcm_free	= kirkwood_dma_free_dma_buffers,
};
Commit	Line	Data
f9b95980	1	/*
	2	* kirkwood-dma.c
	3	*
	4	* (c) 2010 Arnaud Patard <apatard@mandriva.com>
69737897	5	* (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
f9b95980	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2 of the License, or (at your
	10	* option) any later version.
	11	*/
	12
	13	#include <linux/init.h>
	14	#include <linux/module.h>
	15	#include <linux/device.h>
	16	#include <linux/io.h>
	17	#include <linux/slab.h>
	18	#include <linux/interrupt.h>
	19	#include <linux/dma-mapping.h>
	20	#include <linux/mbus.h>
	21	#include <sound/soc.h>
f9b95980	22	#include "kirkwood.h"
	23
	24	#define KIRKWOOD_RATES \
0aa5e47d RK	25	(SNDRV_PCM_RATE_8000_192000 \| \
	26	SNDRV_PCM_RATE_CONTINUOUS \| \
	27	SNDRV_PCM_RATE_KNOT)
	28
f9b95980	29	#define KIRKWOOD_FORMATS \
	30	(SNDRV_PCM_FMTBIT_S16_LE \| \
	31	SNDRV_PCM_FMTBIT_S24_LE \| \
b51600c0	32	SNDRV_PCM_FMTBIT_S32_LE)
f9b95980	33
a7d09429 RK	34	static struct kirkwood_dma_data kirkwood_priv(struct snd_pcm_substream subs)
	35	{
	36	struct snd_soc_pcm_runtime *soc_runtime = subs->private_data;
	37	return snd_soc_dai_get_drvdata(soc_runtime->cpu_dai);
	38	}
f9b95980	39
	40	static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
	41	.info = (SNDRV_PCM_INFO_INTERLEAVED \|
	42	SNDRV_PCM_INFO_MMAP \|
	43	SNDRV_PCM_INFO_MMAP_VALID \|
	44	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	45	SNDRV_PCM_INFO_PAUSE),
	46	.formats = KIRKWOOD_FORMATS,
	47	.rates = KIRKWOOD_RATES,
0aa5e47d RK	48	.rate_min = 8000,
0aa5e47d RK	49	.rate_max = 384000,
f9b95980	50	.channels_min = 1,
1703470a	51	.channels_max = 8,
e4065f3f	52	.buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES,
f9b95980	53	.period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
	54	.period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
	55	.periods_min = KIRKWOOD_SND_MIN_PERIODS,
	56	.periods_max = KIRKWOOD_SND_MAX_PERIODS,
	57	.fifo_size = 0,
	58	};
	59
350e16d5	60	static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32);
f9b95980	61
	62	static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
	63	{
a7d09429	64	struct kirkwood_dma_data *priv = dev_id;
f9b95980	65	unsigned long mask, status, cause;
	66
	67	mask = readl(priv->io + KIRKWOOD_INT_MASK);
	68	status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
	69
	70	cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
	71	if (unlikely(cause)) {
	72	printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
	73	__func__, cause);
	74	writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
f9b95980	75	}
	76
	77	/* we've enabled only bytes interrupts ... */
	78	if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES \| \
	79	KIRKWOOD_INT_CAUSE_REC_BYTES)) {
	80	printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
	81	__func__, status);
	82	return IRQ_NONE;
	83	}
	84
	85	/* ack int */
	86	writel(status, priv->io + KIRKWOOD_INT_CAUSE);
	87
	88	if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
a7d09429	89	snd_pcm_period_elapsed(priv->substream_play);
f9b95980	90
f9b95980	91	if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
a7d09429	92	snd_pcm_period_elapsed(priv->substream_rec);
f9b95980	93
	94	return IRQ_HANDLED;
	95	}
	96
63a9332b AL	97	static void
	98	kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
	99	unsigned long dma,
	100	const struct mbus_dram_target_info *dram)
f9b95980	101	{
	102	int i;
	103
	104	/* First disable and clear windows */
	105	writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
	106	writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
	107
	108	/* try to find matching cs for current dma address */
	109	for (i = 0; i < dram->num_cs; i++) {
63a9332b	110	const struct mbus_dram_window *cs = dram->cs + i;
f9b95980	111	if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
	112	writel(cs->base & 0xffff0000,
	113	base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
	114	writel(((cs->size - 1) & 0xffff0000) \|
	115	(cs->mbus_attr << 8) \|
	116	(dram->mbus_dram_target_id << 4) \| 1,
	117	base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
	118	}
	119	}
	120	}
	121
	122	static int kirkwood_dma_open(struct snd_pcm_substream *substream)
	123	{
	124	int err;
	125	struct snd_pcm_runtime *runtime = substream->runtime;
a7d09429	126	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
63a9332b	127	const struct mbus_dram_target_info *dram;
f9b95980	128	unsigned long addr;
f9b95980	129
f9b95980	130	snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
f9b95980	131
25985edc	132	/* Ensure that all constraints linked to dma burst are fulfilled */
f9b95980	133	err = snd_pcm_hw_constraint_minmax(runtime,
	134	SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
	135	priv->burst * 2,
	136	KIRKWOOD_AUDIO_BUF_MAX-1);
	137	if (err < 0)
	138	return err;
	139
	140	err = snd_pcm_hw_constraint_step(runtime, 0,
	141	SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
	142	priv->burst);
	143	if (err < 0)
	144	return err;
	145
	146	err = snd_pcm_hw_constraint_step(substream->runtime, 0,
	147	SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
	148	priv->burst);
	149	if (err < 0)
	150	return err;
	151
a7d09429	152	if (!priv->substream_play && !priv->substream_rec) {
f9b95980	153	err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
a7d09429 RK	154	"kirkwood-i2s", priv);
a7d09429 RK	155	if (err)
f9b95980	156	return -EBUSY;
f9b95980	157
	158	/*
	159	* Enable Error interrupts. We're only ack'ing them but
25985edc	160	* it's useful for diagnostics
f9b95980	161	*/
e2c9917b	162	writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
f9b95980	163	}
f9b95980	164
63a9332b	165	dram = mv_mbus_dram_info();
ae6a5d37	166	addr = substream->dma_buffer.addr;
f9b95980	167	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
a7d09429	168	priv->substream_play = substream;
f9b95980	169	kirkwood_dma_conf_mbus_windows(priv->io,
63a9332b	170	KIRKWOOD_PLAYBACK_WIN, addr, dram);
f9b95980	171	} else {
a7d09429	172	priv->substream_rec = substream;
f9b95980	173	kirkwood_dma_conf_mbus_windows(priv->io,
63a9332b	174	KIRKWOOD_RECORD_WIN, addr, dram);
f9b95980	175	}
	176
	177	return 0;
	178	}
	179
	180	static int kirkwood_dma_close(struct snd_pcm_substream *substream)
	181	{
a7d09429	182	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
f9b95980	183
a7d09429	184	if (!priv)
f9b95980	185	return 0;
	186
	187	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
a7d09429	188	priv->substream_play = NULL;
f9b95980	189	else
a7d09429	190	priv->substream_rec = NULL;
f9b95980	191
a7d09429	192	if (!priv->substream_play && !priv->substream_rec) {
f9b95980	193	writel(0, priv->io + KIRKWOOD_ERR_MASK);
a7d09429	194	free_irq(priv->irq, priv);
f9b95980	195	}
	196
	197	return 0;
	198	}
	199
	200	static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
	201	struct snd_pcm_hw_params *params)
	202	{
	203	struct snd_pcm_runtime *runtime = substream->runtime;
	204
	205	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	206	runtime->dma_bytes = params_buffer_bytes(params);
	207
	208	return 0;
	209	}
	210
	211	static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
	212	{
	213	snd_pcm_set_runtime_buffer(substream, NULL);
	214	return 0;
	215	}
	216
	217	static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
	218	{
	219	struct snd_pcm_runtime *runtime = substream->runtime;
a7d09429	220	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
f9b95980	221	unsigned long size, count;
f9b95980	222
f9b95980	223	/* compute buffer size in term of "words" as requested in specs */
	224	size = frames_to_bytes(runtime, runtime->buffer_size);
	225	size = (size>>2)-1;
	226	count = snd_pcm_lib_period_bytes(substream);
	227
	228	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	229	writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
	230	writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
	231	writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
	232	} else {
	233	writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
	234	writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
	235	writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
	236	}
	237
	238
	239	return 0;
	240	}
	241
	242	static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
	243	*substream)
	244	{
a7d09429	245	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
f9b95980	246	snd_pcm_uframes_t count;
f9b95980	247
f9b95980	248	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	249	count = bytes_to_frames(substream->runtime,
	250	readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
	251	else
	252	count = bytes_to_frames(substream->runtime,
	253	readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
	254
	255	return count;
	256	}
	257
5d0c8a58	258	static struct snd_pcm_ops kirkwood_dma_ops = {
f9b95980	259	.open = kirkwood_dma_open,
	260	.close = kirkwood_dma_close,
	261	.ioctl = snd_pcm_lib_ioctl,
	262	.hw_params = kirkwood_dma_hw_params,
	263	.hw_free = kirkwood_dma_hw_free,
	264	.prepare = kirkwood_dma_prepare,
	265	.pointer = kirkwood_dma_pointer,
	266	};
	267
	268	static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
	269	int stream)
	270	{
	271	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	272	struct snd_dma_buffer *buf = &substream->dma_buffer;
	273	size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
	274
	275	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	276	buf->dev.dev = pcm->card->dev;
	277	buf->area = dma_alloc_coherent(pcm->card->dev, size,
	278	&buf->addr, GFP_KERNEL);
	279	if (!buf->area)
	280	return -ENOMEM;
	281	buf->bytes = size;
	282	buf->private_data = NULL;
	283
	284	return 0;
	285	}
	286
552d1ef6	287	static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
f9b95980	288	{
552d1ef6	289	struct snd_card *card = rtd->card->snd_card;
552d1ef6	290	struct snd_pcm *pcm = rtd->pcm;
f9b95980	291	int ret;
	292
	293	if (!card->dev->dma_mask)
	294	card->dev->dma_mask = &kirkwood_dma_dmamask;
	295	if (!card->dev->coherent_dma_mask)
350e16d5	296	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
f9b95980	297
25e9e756	298	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
f9b95980	299	ret = kirkwood_dma_preallocate_dma_buffer(pcm,
	300	SNDRV_PCM_STREAM_PLAYBACK);
	301	if (ret)
	302	return ret;
	303	}
	304
25e9e756	305	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
f9b95980	306	ret = kirkwood_dma_preallocate_dma_buffer(pcm,
	307	SNDRV_PCM_STREAM_CAPTURE);
	308	if (ret)
	309	return ret;
	310	}
	311
	312	return 0;
	313	}
	314
	315	static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
	316	{
	317	struct snd_pcm_substream *substream;
	318	struct snd_dma_buffer *buf;
	319	int stream;
	320
	321	for (stream = 0; stream < 2; stream++) {
	322	substream = pcm->streams[stream].substream;
	323	if (!substream)
	324	continue;
	325	buf = &substream->dma_buffer;
	326	if (!buf->area)
	327	continue;
	328
	329	dma_free_coherent(pcm->card->dev, buf->bytes,
	330	buf->area, buf->addr);
	331	buf->area = NULL;
	332	}
	333	}
	334
64ddf1f8	335	struct snd_soc_platform_driver kirkwood_soc_platform = {
f0fba2ad	336	.ops = &kirkwood_dma_ops,
f9b95980	337	.pcm_new = kirkwood_dma_new,
	338	.pcm_free = kirkwood_dma_free_dma_buffers,
	339	};