[deliverable/linux.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 | \
	 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE | \
	 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE)

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		= 8000,
	.rate_max		= 384000,
	.channels_min		= 1,
	.channels_max		= 8,
	.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 kirkwood_soc_platform_probe(struct platform_device *pdev)
{
	return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
}

static int 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 = 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 \
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 \| \
1703470a RK	32	SNDRV_PCM_FMTBIT_S32_LE \| \
	33	SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE \| \
	34	SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE)
f9b95980	35
	36	struct kirkwood_dma_priv {
	37	struct snd_pcm_substream *play_stream;
	38	struct snd_pcm_substream *rec_stream;
	39	struct kirkwood_dma_data *data;
	40	};
	41
	42	static struct snd_pcm_hardware kirkwood_dma_snd_hw = {
	43	.info = (SNDRV_PCM_INFO_INTERLEAVED \|
	44	SNDRV_PCM_INFO_MMAP \|
	45	SNDRV_PCM_INFO_MMAP_VALID \|
	46	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	47	SNDRV_PCM_INFO_PAUSE),
	48	.formats = KIRKWOOD_FORMATS,
	49	.rates = KIRKWOOD_RATES,
0aa5e47d RK	50	.rate_min = 8000,
0aa5e47d RK	51	.rate_max = 384000,
f9b95980	52	.channels_min = 1,
1703470a	53	.channels_max = 8,
f9b95980	54	.buffer_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS,
	55	.period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
	56	.period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
	57	.periods_min = KIRKWOOD_SND_MIN_PERIODS,
	58	.periods_max = KIRKWOOD_SND_MAX_PERIODS,
	59	.fifo_size = 0,
	60	};
	61
350e16d5	62	static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32);
f9b95980	63
	64	static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
	65	{
	66	struct kirkwood_dma_priv *prdata = dev_id;
	67	struct kirkwood_dma_data *priv = prdata->data;
	68	unsigned long mask, status, cause;
	69
	70	mask = readl(priv->io + KIRKWOOD_INT_MASK);
	71	status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;
	72
	73	cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
	74	if (unlikely(cause)) {
	75	printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
	76	__func__, cause);
	77	writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
f9b95980	78	}
	79
	80	/* we've enabled only bytes interrupts ... */
	81	if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES \| \
	82	KIRKWOOD_INT_CAUSE_REC_BYTES)) {
	83	printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
	84	__func__, status);
	85	return IRQ_NONE;
	86	}
	87
	88	/* ack int */
	89	writel(status, priv->io + KIRKWOOD_INT_CAUSE);
	90
	91	if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
	92	snd_pcm_period_elapsed(prdata->play_stream);
	93
	94	if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
	95	snd_pcm_period_elapsed(prdata->rec_stream);
	96
	97	return IRQ_HANDLED;
	98	}
	99
63a9332b AL	100	static void
	101	kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
	102	unsigned long dma,
	103	const struct mbus_dram_target_info *dram)
f9b95980	104	{
	105	int i;
	106
	107	/* First disable and clear windows */
	108	writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
	109	writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
	110
	111	/* try to find matching cs for current dma address */
	112	for (i = 0; i < dram->num_cs; i++) {
63a9332b	113	const struct mbus_dram_window *cs = dram->cs + i;
f9b95980	114	if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
	115	writel(cs->base & 0xffff0000,
	116	base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
	117	writel(((cs->size - 1) & 0xffff0000) \|
	118	(cs->mbus_attr << 8) \|
	119	(dram->mbus_dram_target_id << 4) \| 1,
	120	base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
	121	}
	122	}
	123	}
	124
	125	static int kirkwood_dma_open(struct snd_pcm_substream *substream)
	126	{
	127	int err;
	128	struct snd_pcm_runtime *runtime = substream->runtime;
	129	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
f0fba2ad LG	130	struct snd_soc_platform *platform = soc_runtime->platform;
f0fba2ad LG	131	struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
f9b95980	132	struct kirkwood_dma_data *priv;
f0fba2ad	133	struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
63a9332b	134	const struct mbus_dram_target_info *dram;
f9b95980	135	unsigned long addr;
	136
	137	priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
	138	snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);
	139
25985edc	140	/* Ensure that all constraints linked to dma burst are fulfilled */
f9b95980	141	err = snd_pcm_hw_constraint_minmax(runtime,
	142	SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
	143	priv->burst * 2,
	144	KIRKWOOD_AUDIO_BUF_MAX-1);
	145	if (err < 0)
	146	return err;
	147
	148	err = snd_pcm_hw_constraint_step(runtime, 0,
	149	SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
	150	priv->burst);
	151	if (err < 0)
	152	return err;
	153
	154	err = snd_pcm_hw_constraint_step(substream->runtime, 0,
	155	SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
	156	priv->burst);
	157	if (err < 0)
	158	return err;
	159
f0fba2ad	160	if (prdata == NULL) {
f9b95980	161	prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL);
	162	if (prdata == NULL)
	163	return -ENOMEM;
	164
	165	prdata->data = priv;
	166
	167	err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
	168	"kirkwood-i2s", prdata);
	169	if (err) {
	170	kfree(prdata);
	171	return -EBUSY;
	172	}
	173
f0fba2ad	174	snd_soc_platform_set_drvdata(platform, prdata);
f9b95980	175
	176	/*
	177	* Enable Error interrupts. We're only ack'ing them but
25985edc	178	* it's useful for diagnostics
f9b95980	179	*/
	180	writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK);
	181	}
	182
63a9332b	183	dram = mv_mbus_dram_info();
ae6a5d37	184	addr = substream->dma_buffer.addr;
f9b95980	185	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	186	prdata->play_stream = substream;
	187	kirkwood_dma_conf_mbus_windows(priv->io,
63a9332b	188	KIRKWOOD_PLAYBACK_WIN, addr, dram);
f9b95980	189	} else {
	190	prdata->rec_stream = substream;
	191	kirkwood_dma_conf_mbus_windows(priv->io,
63a9332b	192	KIRKWOOD_RECORD_WIN, addr, dram);
f9b95980	193	}
	194
	195	return 0;
	196	}
	197
	198	static int kirkwood_dma_close(struct snd_pcm_substream *substream)
	199	{
	200	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
f0fba2ad LG	201	struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
	202	struct snd_soc_platform *platform = soc_runtime->platform;
	203	struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform);
f9b95980	204	struct kirkwood_dma_data *priv;
	205
	206	priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
	207
	208	if (!prdata \|\| !priv)
	209	return 0;
	210
	211	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	212	prdata->play_stream = NULL;
	213	else
	214	prdata->rec_stream = NULL;
	215
	216	if (!prdata->play_stream && !prdata->rec_stream) {
	217	writel(0, priv->io + KIRKWOOD_ERR_MASK);
	218	free_irq(priv->irq, prdata);
	219	kfree(prdata);
f0fba2ad	220	snd_soc_platform_set_drvdata(platform, NULL);
f9b95980	221	}
	222
	223	return 0;
	224	}
	225
	226	static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream,
	227	struct snd_pcm_hw_params *params)
	228	{
	229	struct snd_pcm_runtime *runtime = substream->runtime;
	230
	231	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	232	runtime->dma_bytes = params_buffer_bytes(params);
	233
	234	return 0;
	235	}
	236
	237	static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream)
	238	{
	239	snd_pcm_set_runtime_buffer(substream, NULL);
	240	return 0;
	241	}
	242
	243	static int kirkwood_dma_prepare(struct snd_pcm_substream *substream)
	244	{
	245	struct snd_pcm_runtime *runtime = substream->runtime;
	246	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
f0fba2ad	247	struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
f9b95980	248	struct kirkwood_dma_data *priv;
	249	unsigned long size, count;
	250
	251	priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
	252
	253	/* compute buffer size in term of "words" as requested in specs */
	254	size = frames_to_bytes(runtime, runtime->buffer_size);
	255	size = (size>>2)-1;
	256	count = snd_pcm_lib_period_bytes(substream);
	257
	258	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	259	writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
	260	writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
	261	writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
	262	} else {
	263	writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
	264	writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
	265	writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
	266	}
	267
	268
	269	return 0;
	270	}
	271
	272	static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream
	273	*substream)
	274	{
	275	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
f0fba2ad	276	struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai;
f9b95980	277	struct kirkwood_dma_data *priv;
	278	snd_pcm_uframes_t count;
	279
	280	priv = snd_soc_dai_get_dma_data(cpu_dai, substream);
	281
	282	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	283	count = bytes_to_frames(substream->runtime,
	284	readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
	285	else
	286	count = bytes_to_frames(substream->runtime,
	287	readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));
	288
	289	return count;
	290	}
	291
	292	struct snd_pcm_ops kirkwood_dma_ops = {
	293	.open = kirkwood_dma_open,
	294	.close = kirkwood_dma_close,
	295	.ioctl = snd_pcm_lib_ioctl,
	296	.hw_params = kirkwood_dma_hw_params,
	297	.hw_free = kirkwood_dma_hw_free,
	298	.prepare = kirkwood_dma_prepare,
	299	.pointer = kirkwood_dma_pointer,
	300	};
	301
	302	static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm,
	303	int stream)
	304	{
	305	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	306	struct snd_dma_buffer *buf = &substream->dma_buffer;
	307	size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
	308
	309	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	310	buf->dev.dev = pcm->card->dev;
	311	buf->area = dma_alloc_coherent(pcm->card->dev, size,
	312	&buf->addr, GFP_KERNEL);
	313	if (!buf->area)
	314	return -ENOMEM;
	315	buf->bytes = size;
	316	buf->private_data = NULL;
	317
	318	return 0;
	319	}
	320
552d1ef6	321	static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd)
f9b95980	322	{
552d1ef6	323	struct snd_card *card = rtd->card->snd_card;
552d1ef6	324	struct snd_pcm *pcm = rtd->pcm;
f9b95980	325	int ret;
	326
	327	if (!card->dev->dma_mask)
	328	card->dev->dma_mask = &kirkwood_dma_dmamask;
	329	if (!card->dev->coherent_dma_mask)
350e16d5	330	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
f9b95980	331
25e9e756	332	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
f9b95980	333	ret = kirkwood_dma_preallocate_dma_buffer(pcm,
	334	SNDRV_PCM_STREAM_PLAYBACK);
	335	if (ret)
	336	return ret;
	337	}
	338
25e9e756	339	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
f9b95980	340	ret = kirkwood_dma_preallocate_dma_buffer(pcm,
	341	SNDRV_PCM_STREAM_CAPTURE);
	342	if (ret)
	343	return ret;
	344	}
	345
	346	return 0;
	347	}
	348
	349	static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm)
	350	{
	351	struct snd_pcm_substream *substream;
	352	struct snd_dma_buffer *buf;
	353	int stream;
	354
	355	for (stream = 0; stream < 2; stream++) {
	356	substream = pcm->streams[stream].substream;
	357	if (!substream)
	358	continue;
	359	buf = &substream->dma_buffer;
	360	if (!buf->area)
	361	continue;
	362
	363	dma_free_coherent(pcm->card->dev, buf->bytes,
	364	buf->area, buf->addr);
	365	buf->area = NULL;
	366	}
	367	}
	368
f0fba2ad LG	369	static struct snd_soc_platform_driver kirkwood_soc_platform = {
f0fba2ad LG	370	.ops = &kirkwood_dma_ops,
f9b95980	371	.pcm_new = kirkwood_dma_new,
	372	.pcm_free = kirkwood_dma_free_dma_buffers,
	373	};
f9b95980	374
34e15fbd	375	static int kirkwood_soc_platform_probe(struct platform_device *pdev)
f9b95980	376	{
f0fba2ad	377	return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
f9b95980	378	}
f9b95980	379
34e15fbd	380	static int kirkwood_soc_platform_remove(struct platform_device *pdev)
f9b95980	381	{
f0fba2ad LG	382	snd_soc_unregister_platform(&pdev->dev);
	383	return 0;
	384	}
	385
	386	static struct platform_driver kirkwood_pcm_driver = {
	387	.driver = {
	388	.name = "kirkwood-pcm-audio",
	389	.owner = THIS_MODULE,
	390	},
	391
	392	.probe = kirkwood_soc_platform_probe,
34e15fbd	393	.remove = kirkwood_soc_platform_remove,
f0fba2ad LG	394	};
f0fba2ad LG	395
41b10225	396	module_platform_driver(kirkwood_pcm_driver);
f9b95980	397
69737897	398	MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
f9b95980	399	MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module");
f9b95980	400	MODULE_LICENSE("GPL");
3ba31051	401	MODULE_ALIAS("platform:kirkwood-pcm-audio");