[mirror_ubuntu-artful-kernel.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_44100 | \
	 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
#define KIRKWOOD_FORMATS \
	(SNDRV_PCM_FMTBIT_S16_LE | \
	 SNDRV_PCM_FMTBIT_S24_LE | \
	 SNDRV_PCM_FMTBIT_S32_LE)

struct kirkwood_dma_priv {
	struct snd_pcm_substream *play_stream;
	struct snd_pcm_substream *rec_stream;
	struct kirkwood_dma_data *data;
};

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		= 44100,
	.rate_max		= 96000,
	.channels_min		= 1,
	.channels_max		= 2,
	.buffer_bytes_max	= KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS,
	.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_priv *prdata = dev_id;
	struct kirkwood_dma_data *priv = prdata->data;
	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(prdata->play_stream);

	if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
		snd_pcm_period_elapsed(prdata->rec_stream);

	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 snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct snd_soc_platform *platform = soc_runtime->platform;
	struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
	struct kirkwood_dma_data *priv;
	struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
	const struct mbus_dram_target_info *dram;
	unsigned long addr;

	priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
	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 (prdata == NULL) {
		prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
		if (prdata == NULL)
			return -ENOMEM;

		prdata->data = priv;

		err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
				  "kirkwood-i2s", prdata);
		if (err) {
			kfree(prdata);
			return -EBUSY;
		}

		snd_soc_platform_set_drvdata(platform, prdata);

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

	dram = mv_mbus_dram_info();
	addr = substream->dma_buffer.addr;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		prdata->play_stream = substream;
		kirkwood_dma_conf_mbus_windows(priv->io,
			KIRKWOOD_PLAYBACK_WIN, addr, dram);
	} else {
		prdata->rec_stream = 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 snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
	struct snd_soc_platform *platform = soc_runtime->platform;
	struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
	struct kirkwood_dma_data *priv;

	priv = snd_soc_dai_get_dma_data(cpu_dai, substream);

	if (!prdata || !priv)
		return 0;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		prdata->play_stream = NULL;
	else
		prdata->rec_stream = NULL;

	if (!prdata->play_stream && !prdata->rec_stream) {
		writel(0, priv->io + KIRKWOOD_ERR_MASK);
		free_irq(priv->irq, prdata);
		kfree(prdata);
		snd_soc_platform_set_drvdata(platform, NULL);
	}

	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 snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
	struct kirkwood_dma_data *priv;
	unsigned long size, count;

	priv = snd_soc_dai_get_dma_data(cpu_dai, substream);

	/* 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 snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
	struct kirkwood_dma_data *priv;
	snd_pcm_uframes_t count;

	priv = snd_soc_dai_get_dma_data(cpu_dai, substream);

	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;
}

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;
	}
}

static struct snd_soc_platform_driver kirkwood_soc_platform = {
	.ops		= &kirkwood_dma_ops,
	.pcm_new	= kirkwood_dma_new,
	.pcm_free	= kirkwood_dma_free_dma_buffers,
};

static int __devinit kirkwood_soc_platform_probe(struct platform_device *pdev)
{
	return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
}

static int __devexit kirkwood_soc_platform_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
}

static struct platform_driver kirkwood_pcm_driver = {
	.driver = {
			.name = "kirkwood-pcm-audio",
			.owner = THIS_MODULE,
	},

	.probe = kirkwood_soc_platform_probe,
	.remove = __devexit_p(kirkwood_soc_platform_remove),
};

module_platform_driver(kirkwood_pcm_driver);

MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:kirkwood-pcm-audio");
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 \
	25	(SNDRV_PCM_RATE_44100 \| \
	26	SNDRV_PCM_RATE_48000 \| SNDRV_PCM_RATE_96000)
	27	#define KIRKWOOD_FORMATS \
	28	(SNDRV_PCM_FMTBIT_S16_LE \| \
	29	SNDRV_PCM_FMTBIT_S24_LE \| \
	30	SNDRV_PCM_FMTBIT_S32_LE)
	31
	32	struct kirkwood_dma_priv {
	33	struct snd_pcm_substream *play_stream;
	34	struct snd_pcm_substream *rec_stream;
	35	struct kirkwood_dma_data *data;
	36	};
	37
	38	static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
	39	.info = (SNDRV_PCM_INFO_INTERLEAVED \|
	40	SNDRV_PCM_INFO_MMAP \|
	41	SNDRV_PCM_INFO_MMAP_VALID \|
	42	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	43	SNDRV_PCM_INFO_PAUSE),
	44	.formats = KIRKWOOD_FORMATS,
	45	.rates = KIRKWOOD_RATES,
	46	.rate_min = 44100,
	47	.rate_max = 96000,
	48	.channels_min = 1,
	49	.channels_max = 2,
	50	.buffer_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS,
	51	.period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
	52	.period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
	53	.periods_min = KIRKWOOD_SND_MIN_PERIODS,
	54	.periods_max = KIRKWOOD_SND_MAX_PERIODS,
	55	.fifo_size = 0,
	56	};
	57
350e16d5	58	static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32);
f9b95980	59
	60	static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
	61	{
	62	struct kirkwood_dma_priv *prdata = dev_id;
	63	struct kirkwood_dma_data *priv = prdata->data;
	64	unsigned long mask, status, cause;
	65
	66	mask = readl(priv->io + KIRKWOOD_INT_MASK);
	67	status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
	68
	69	cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
	70	if (unlikely(cause)) {
	71	printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
	72	__func__, cause);
	73	writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
f9b95980	74	}
	75
	76	/* we've enabled only bytes interrupts ... */
	77	if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES \| \
	78	KIRKWOOD_INT_CAUSE_REC_BYTES)) {
	79	printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
	80	__func__, status);
	81	return IRQ_NONE;
	82	}
	83
	84	/* ack int */
	85	writel(status, priv->io + KIRKWOOD_INT_CAUSE);
	86
	87	if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
	88	snd_pcm_period_elapsed(prdata->play_stream);
	89
	90	if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
	91	snd_pcm_period_elapsed(prdata->rec_stream);
	92
	93	return IRQ_HANDLED;
	94	}
	95
63a9332b AL	96	static void
	97	kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
	98	unsigned long dma,
	99	const struct mbus_dram_target_info *dram)
f9b95980	100	{
	101	int i;
	102
	103	/* First disable and clear windows */
	104	writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
	105	writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
	106
	107	/* try to find matching cs for current dma address */
	108	for (i = 0; i < dram->num_cs; i++) {
63a9332b	109	const struct mbus_dram_window *cs = dram->cs + i;
f9b95980	110	if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
	111	writel(cs->base & 0xffff0000,
	112	base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
	113	writel(((cs->size - 1) & 0xffff0000) \|
	114	(cs->mbus_attr << 8) \|
	115	(dram->mbus_dram_target_id << 4) \| 1,
	116	base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
	117	}
	118	}
	119	}
	120
	121	static int kirkwood_dma_open(struct snd_pcm_substream *substream)
	122	{
	123	int err;
	124	struct snd_pcm_runtime *runtime = substream->runtime;
	125	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
f0fba2ad LG	126	struct snd_soc_platform *platform = soc_runtime->platform;
f0fba2ad LG	127	struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
f9b95980	128	struct kirkwood_dma_data *priv;
f0fba2ad	129	struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
63a9332b	130	const struct mbus_dram_target_info *dram;
f9b95980	131	unsigned long addr;
	132
	133	priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
	134	snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
	135
25985edc	136	/* Ensure that all constraints linked to dma burst are fulfilled */
f9b95980	137	err = snd_pcm_hw_constraint_minmax(runtime,
	138	SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
	139	priv->burst * 2,
	140	KIRKWOOD_AUDIO_BUF_MAX-1);
	141	if (err < 0)
	142	return err;
	143
	144	err = snd_pcm_hw_constraint_step(runtime, 0,
	145	SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
	146	priv->burst);
	147	if (err < 0)
	148	return err;
	149
	150	err = snd_pcm_hw_constraint_step(substream->runtime, 0,
	151	SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
	152	priv->burst);
	153	if (err < 0)
	154	return err;
	155
f0fba2ad	156	if (prdata == NULL) {
f9b95980	157	prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
	158	if (prdata == NULL)
	159	return -ENOMEM;
	160
	161	prdata->data = priv;
	162
	163	err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
	164	"kirkwood-i2s", prdata);
	165	if (err) {
	166	kfree(prdata);
	167	return -EBUSY;
	168	}
	169
f0fba2ad	170	snd_soc_platform_set_drvdata(platform, prdata);
f9b95980	171
	172	/*
	173	* Enable Error interrupts. We're only ack'ing them but
25985edc	174	* it's useful for diagnostics
f9b95980	175	*/
	176	writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
	177	}
	178
63a9332b	179	dram = mv_mbus_dram_info();
ae6a5d37	180	addr = substream->dma_buffer.addr;
f9b95980	181	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	182	prdata->play_stream = substream;
	183	kirkwood_dma_conf_mbus_windows(priv->io,
63a9332b	184	KIRKWOOD_PLAYBACK_WIN, addr, dram);
f9b95980	185	} else {
	186	prdata->rec_stream = substream;
	187	kirkwood_dma_conf_mbus_windows(priv->io,
63a9332b	188	KIRKWOOD_RECORD_WIN, addr, dram);
f9b95980	189	}
	190
	191	return 0;
	192	}
	193
	194	static int kirkwood_dma_close(struct snd_pcm_substream *substream)
	195	{
	196	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
f0fba2ad LG	197	struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
	198	struct snd_soc_platform *platform = soc_runtime->platform;
	199	struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
f9b95980	200	struct kirkwood_dma_data *priv;
	201
	202	priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
	203
	204	if (!prdata \|\| !priv)
	205	return 0;
	206
	207	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	208	prdata->play_stream = NULL;
	209	else
	210	prdata->rec_stream = NULL;
	211
	212	if (!prdata->play_stream && !prdata->rec_stream) {
	213	writel(0, priv->io + KIRKWOOD_ERR_MASK);
	214	free_irq(priv->irq, prdata);
	215	kfree(prdata);
f0fba2ad	216	snd_soc_platform_set_drvdata(platform, NULL);
f9b95980	217	}
	218
	219	return 0;
	220	}
	221
	222	static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
	223	struct snd_pcm_hw_params *params)
	224	{
	225	struct snd_pcm_runtime *runtime = substream->runtime;
	226
	227	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	228	runtime->dma_bytes = params_buffer_bytes(params);
	229
	230	return 0;
	231	}
	232
	233	static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
	234	{
	235	snd_pcm_set_runtime_buffer(substream, NULL);
	236	return 0;
	237	}
	238
	239	static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
	240	{
	241	struct snd_pcm_runtime *runtime = substream->runtime;
	242	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
f0fba2ad	243	struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
f9b95980	244	struct kirkwood_dma_data *priv;
	245	unsigned long size, count;
	246
	247	priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
	248
	249	/* compute buffer size in term of "words" as requested in specs */
	250	size = frames_to_bytes(runtime, runtime->buffer_size);
	251	size = (size>>2)-1;
	252	count = snd_pcm_lib_period_bytes(substream);
	253
	254	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	255	writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
	256	writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
	257	writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
	258	} else {
	259	writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
	260	writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
	261	writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
	262	}
	263
	264
	265	return 0;
	266	}
	267
	268	static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
	269	*substream)
	270	{
	271	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
f0fba2ad	272	struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
f9b95980	273	struct kirkwood_dma_data *priv;
	274	snd_pcm_uframes_t count;
	275
	276	priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
	277
	278	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	279	count = bytes_to_frames(substream->runtime,
	280	readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
	281	else
	282	count = bytes_to_frames(substream->runtime,
	283	readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
	284
	285	return count;
	286	}
	287
	288	struct snd_pcm_ops kirkwood_dma_ops = {
	289	.open = kirkwood_dma_open,
	290	.close = kirkwood_dma_close,
	291	.ioctl = snd_pcm_lib_ioctl,
	292	.hw_params = kirkwood_dma_hw_params,
	293	.hw_free = kirkwood_dma_hw_free,
	294	.prepare = kirkwood_dma_prepare,
	295	.pointer = kirkwood_dma_pointer,
	296	};
	297
	298	static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
	299	int stream)
	300	{
	301	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	302	struct snd_dma_buffer *buf = &substream->dma_buffer;
	303	size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
	304
	305	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	306	buf->dev.dev = pcm->card->dev;
	307	buf->area = dma_alloc_coherent(pcm->card->dev, size,
	308	&buf->addr, GFP_KERNEL);
	309	if (!buf->area)
	310	return -ENOMEM;
	311	buf->bytes = size;
	312	buf->private_data = NULL;
	313
	314	return 0;
	315	}
	316
552d1ef6	317	static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
f9b95980	318	{
552d1ef6	319	struct snd_card *card = rtd->card->snd_card;
552d1ef6	320	struct snd_pcm *pcm = rtd->pcm;
f9b95980	321	int ret;
	322
	323	if (!card->dev->dma_mask)
	324	card->dev->dma_mask = &kirkwood_dma_dmamask;
	325	if (!card->dev->coherent_dma_mask)
350e16d5	326	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
f9b95980	327
25e9e756	328	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
f9b95980	329	ret = kirkwood_dma_preallocate_dma_buffer(pcm,
	330	SNDRV_PCM_STREAM_PLAYBACK);
	331	if (ret)
	332	return ret;
	333	}
	334
25e9e756	335	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
f9b95980	336	ret = kirkwood_dma_preallocate_dma_buffer(pcm,
	337	SNDRV_PCM_STREAM_CAPTURE);
	338	if (ret)
	339	return ret;
	340	}
	341
	342	return 0;
	343	}
	344
	345	static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
	346	{
	347	struct snd_pcm_substream *substream;
	348	struct snd_dma_buffer *buf;
	349	int stream;
	350
	351	for (stream = 0; stream < 2; stream++) {
	352	substream = pcm->streams[stream].substream;
	353	if (!substream)
	354	continue;
	355	buf = &substream->dma_buffer;
	356	if (!buf->area)
	357	continue;
	358
	359	dma_free_coherent(pcm->card->dev, buf->bytes,
	360	buf->area, buf->addr);
	361	buf->area = NULL;
	362	}
	363	}
	364
f0fba2ad LG	365	static struct snd_soc_platform_driver kirkwood_soc_platform = {
f0fba2ad LG	366	.ops = &kirkwood_dma_ops,
f9b95980	367	.pcm_new = kirkwood_dma_new,
	368	.pcm_free = kirkwood_dma_free_dma_buffers,
	369	};
f9b95980	370
f0fba2ad	371	static int __devinit kirkwood_soc_platform_probe(struct platform_device *pdev)
f9b95980	372	{
f0fba2ad	373	return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
f9b95980	374	}
f9b95980	375
f0fba2ad	376	static int __devexit kirkwood_soc_platform_remove(struct platform_device *pdev)
f9b95980	377	{
f0fba2ad LG	378	snd_soc_unregister_platform(&pdev->dev);
	379	return 0;
	380	}
	381
	382	static struct platform_driver kirkwood_pcm_driver = {
	383	.driver = {
	384	.name = "kirkwood-pcm-audio",
	385	.owner = THIS_MODULE,
	386	},
	387
	388	.probe = kirkwood_soc_platform_probe,
	389	.remove = __devexit_p(kirkwood_soc_platform_remove),
	390	};
	391
41b10225	392	module_platform_driver(kirkwood_pcm_driver);
f9b95980	393
69737897	394	MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
f9b95980	395	MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
f9b95980	396	MODULE_LICENSE("GPL");
3ba31051	397	MODULE_ALIAS("platform:kirkwood-pcm-audio");