[deliverable/linux.git] / sound / soc / au1x / dbdma2.c

/*
 * Au12x0/Au1550 PSC ALSA ASoC audio support.
 *
 * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
 *	Manuel Lauss <manuel.lauss@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * DMA glue for Au1x-PSC audio.
 *
 */


#include <linux/module.h>
#include <linux/init.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-au1x00/au1000.h>
#include <asm/mach-au1x00/au1xxx_dbdma.h>
#include <asm/mach-au1x00/au1xxx_psc.h>

#include "psc.h"

/*#define PCM_DEBUG*/

#define MSG(x...)	printk(KERN_INFO "au1xpsc_pcm: " x)
#ifdef PCM_DEBUG
#define DBG		MSG
#else
#define DBG(x...)	do {} while (0)
#endif

struct au1xpsc_audio_dmadata {
	/* DDMA control data */
	unsigned int ddma_id;		/* DDMA direction ID for this PSC */
	u32 ddma_chan;			/* DDMA context */

	/* PCM context (for irq handlers) */
	struct snd_pcm_substream *substream;
	unsigned long curr_period;	/* current segment DDMA is working on */
	unsigned long q_period;		/* queue period(s) */
	dma_addr_t dma_area;		/* address of queued DMA area */
	dma_addr_t dma_area_s;		/* start address of DMA area */
	unsigned long pos;		/* current byte position being played */
	unsigned long periods;		/* number of SG segments in total */
	unsigned long period_bytes;	/* size in bytes of one SG segment */

	/* runtime data */
	int msbits;
};

/*
 * These settings are somewhat okay, at least on my machine audio plays
 * almost skip-free. Especially the 64kB buffer seems to help a LOT.
 */
#define AU1XPSC_PERIOD_MIN_BYTES	1024
#define AU1XPSC_BUFFER_MIN_BYTES	65536

/* PCM hardware DMA capabilities - platform specific */
static const struct snd_pcm_hardware au1xpsc_pcm_hardware = {
	.info		  = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
			    SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH,
	.period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES,
	.period_bytes_max = 4096 * 1024 - 1,
	.periods_min	  = 2,
	.periods_max	  = 4096,	/* 2 to as-much-as-you-like */
	.buffer_bytes_max = 4096 * 1024 - 1,
	.fifo_size	  = 16,		/* fifo entries of AC97/I2S PSC */
};

static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd)
{
	au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area,
				cd->period_bytes, DDMA_FLAGS_IE);

	/* update next-to-queue period */
	++cd->q_period;
	cd->dma_area += cd->period_bytes;
	if (cd->q_period >= cd->periods) {
		cd->q_period = 0;
		cd->dma_area = cd->dma_area_s;
	}
}

static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd)
{
	au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area,
			      cd->period_bytes, DDMA_FLAGS_IE);

	/* update next-to-queue period */
	++cd->q_period;
	cd->dma_area += cd->period_bytes;
	if (cd->q_period >= cd->periods) {
		cd->q_period = 0;
		cd->dma_area = cd->dma_area_s;
	}
}

static void au1x_pcm_dmatx_cb(int irq, void *dev_id)
{
	struct au1xpsc_audio_dmadata *cd = dev_id;

	cd->pos += cd->period_bytes;
	if (++cd->curr_period >= cd->periods) {
		cd->pos = 0;
		cd->curr_period = 0;
	}
	snd_pcm_period_elapsed(cd->substream);
	au1x_pcm_queue_tx(cd);
}

static void au1x_pcm_dmarx_cb(int irq, void *dev_id)
{
	struct au1xpsc_audio_dmadata *cd = dev_id;

	cd->pos += cd->period_bytes;
	if (++cd->curr_period >= cd->periods) {
		cd->pos = 0;
		cd->curr_period = 0;
	}
	snd_pcm_period_elapsed(cd->substream);
	au1x_pcm_queue_rx(cd);
}

static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd)
{
	if (pcd->ddma_chan) {
		au1xxx_dbdma_stop(pcd->ddma_chan);
		au1xxx_dbdma_reset(pcd->ddma_chan);
		au1xxx_dbdma_chan_free(pcd->ddma_chan);
		pcd->ddma_chan = 0;
		pcd->msbits = 0;
	}
}

/* in case of missing DMA ring or changed TX-source / RX-dest bit widths,
 * allocate (or reallocate) a 2-descriptor DMA ring with bit depth according
 * to ALSA-supplied sample depth.  This is due to limitations in the dbdma api
 * (cannot adjust source/dest widths of already allocated descriptor ring).
 */
static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd,
				 int stype, int msbits)
{
	/* DMA only in 8/16/32 bit widths */
	if (msbits == 24)
		msbits = 32;

	/* check current config: correct bits and descriptors allocated? */
	if ((pcd->ddma_chan) && (msbits == pcd->msbits))
		goto out;	/* all ok! */

	au1x_pcm_dbdma_free(pcd);

	if (stype == SNDRV_PCM_STREAM_CAPTURE)
		pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id,
					DSCR_CMD0_ALWAYS,
					au1x_pcm_dmarx_cb, (void *)pcd);
	else
		pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
					pcd->ddma_id,
					au1x_pcm_dmatx_cb, (void *)pcd);

	if (!pcd->ddma_chan)
		return -ENOMEM;

	au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits);
	au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2);

	pcd->msbits = msbits;

	au1xxx_dbdma_stop(pcd->ddma_chan);
	au1xxx_dbdma_reset(pcd->ddma_chan);

out:
	return 0;
}

static inline struct au1xpsc_audio_dmadata *to_dmadata(struct snd_pcm_substream *ss)
{
	struct snd_soc_pcm_runtime *rtd = ss->private_data;
	struct au1xpsc_audio_dmadata *pcd =
				snd_soc_platform_get_drvdata(rtd->platform);
	return &pcd[ss->stream];
}

static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct au1xpsc_audio_dmadata *pcd;
	int stype, ret;

	ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
	if (ret < 0)
		goto out;

	stype = substream->stream;
	pcd = to_dmadata(substream);

	DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %zu "
	    "runtime->min_align %lu\n",
		(unsigned long)runtime->dma_area,
		(unsigned long)runtime->dma_addr, runtime->dma_bytes,
		runtime->min_align);

	DBG("bits %d  frags %d  frag_bytes %d  is_rx %d\n", params->msbits,
		params_periods(params), params_period_bytes(params), stype);

	ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits);
	if (ret) {
		MSG("DDMA channel (re)alloc failed!\n");
		goto out;
	}

	pcd->substream = substream;
	pcd->period_bytes = params_period_bytes(params);
	pcd->periods = params_periods(params);
	pcd->dma_area_s = pcd->dma_area = runtime->dma_addr;
	pcd->q_period = 0;
	pcd->curr_period = 0;
	pcd->pos = 0;

	ret = 0;
out:
	return ret;
}

static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream)
{
	snd_pcm_lib_free_pages(substream);
	return 0;
}

static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);

	au1xxx_dbdma_reset(pcd->ddma_chan);

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
		au1x_pcm_queue_rx(pcd);
		au1x_pcm_queue_rx(pcd);
	} else {
		au1x_pcm_queue_tx(pcd);
		au1x_pcm_queue_tx(pcd);
	}

	return 0;
}

static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	u32 c = to_dmadata(substream)->ddma_chan;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		au1xxx_dbdma_start(c);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		au1xxx_dbdma_stop(c);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static snd_pcm_uframes_t
au1xpsc_pcm_pointer(struct snd_pcm_substream *substream)
{
	return bytes_to_frames(substream->runtime, to_dmadata(substream)->pos);
}

static int au1xpsc_pcm_open(struct snd_pcm_substream *substream)
{
	struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int stype = substream->stream, *dmaids;

	dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	if (!dmaids)
		return -ENODEV;	/* whoa, has ordering changed? */

	pcd->ddma_id = dmaids[stype];

	snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware);
	return 0;
}

static int au1xpsc_pcm_close(struct snd_pcm_substream *substream)
{
	au1x_pcm_dbdma_free(to_dmadata(substream));
	return 0;
}

static struct snd_pcm_ops au1xpsc_pcm_ops = {
	.open		= au1xpsc_pcm_open,
	.close		= au1xpsc_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= au1xpsc_pcm_hw_params,
	.hw_free	= au1xpsc_pcm_hw_free,
	.prepare	= au1xpsc_pcm_prepare,
	.trigger	= au1xpsc_pcm_trigger,
	.pointer	= au1xpsc_pcm_pointer,
};

static int au1xpsc_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
		card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1);

	return 0;
}

/* au1xpsc audio platform */
static struct snd_soc_platform_driver au1xpsc_soc_platform = {
	.ops		= &au1xpsc_pcm_ops,
	.pcm_new	= au1xpsc_pcm_new,
};

static int au1xpsc_pcm_drvprobe(struct platform_device *pdev)
{
	struct au1xpsc_audio_dmadata *dmadata;

	dmadata = devm_kzalloc(&pdev->dev,
			       2 * sizeof(struct au1xpsc_audio_dmadata),
			       GFP_KERNEL);
	if (!dmadata)
		return -ENOMEM;

	platform_set_drvdata(pdev, dmadata);

	return devm_snd_soc_register_platform(&pdev->dev,
					      &au1xpsc_soc_platform);
}

static struct platform_driver au1xpsc_pcm_driver = {
	.driver	= {
		.name	= "au1xpsc-pcm",
	},
	.probe		= au1xpsc_pcm_drvprobe,
};

module_platform_driver(au1xpsc_pcm_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
MODULE_AUTHOR("Manuel Lauss");
Commit	Line	Data
4a161d23 ML	1	/*
	2	* Au12x0/Au1550 PSC ALSA ASoC audio support.
	3	*
	4	* (c) 2007-2008 MSC Vertriebsges.m.b.H.,
0f83d639	5	* Manuel Lauss <manuel.lauss@gmail.com>
4a161d23 ML	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* DMA glue for Au1x-PSC audio.
	12	*
4a161d23 ML	13	*/
	14
	15
	16	#include <linux/module.h>
	17	#include <linux/init.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/slab.h>
	20	#include <linux/dma-mapping.h>
	21
	22	#include <sound/core.h>
	23	#include <sound/pcm.h>
	24	#include <sound/pcm_params.h>
	25	#include <sound/soc.h>
	26
	27	#include <asm/mach-au1x00/au1000.h>
	28	#include <asm/mach-au1x00/au1xxx_dbdma.h>
	29	#include <asm/mach-au1x00/au1xxx_psc.h>
	30
	31	#include "psc.h"
	32
	33	/#define PCM_DEBUG/
	34
	35	#define MSG(x...) printk(KERN_INFO "au1xpsc_pcm: " x)
	36	#ifdef PCM_DEBUG
	37	#define DBG MSG
	38	#else
	39	#define DBG(x...) do {} while (0)
	40	#endif
	41
	42	struct au1xpsc_audio_dmadata {
	43	/* DDMA control data */
	44	unsigned int ddma_id; /* DDMA direction ID for this PSC */
	45	u32 ddma_chan; /* DDMA context */
	46
	47	/* PCM context (for irq handlers) */
	48	struct snd_pcm_substream *substream;
	49	unsigned long curr_period; /* current segment DDMA is working on */
	50	unsigned long q_period; /* queue period(s) */
963accbc ML	51	dma_addr_t dma_area; /* address of queued DMA area */
963accbc ML	52	dma_addr_t dma_area_s; /* start address of DMA area */
4a161d23 ML	53	unsigned long pos; /* current byte position being played */
	54	unsigned long periods; /* number of SG segments in total */
	55	unsigned long period_bytes; /* size in bytes of one SG segment */
	56
	57	/* runtime data */
	58	int msbits;
	59	};
	60
4a161d23 ML	61	/*
	62	* These settings are somewhat okay, at least on my machine audio plays
	63	* almost skip-free. Especially the 64kB buffer seems to help a LOT.
	64	*/
	65	#define AU1XPSC_PERIOD_MIN_BYTES 1024
	66	#define AU1XPSC_BUFFER_MIN_BYTES 65536
	67
4a161d23 ML	68	/* PCM hardware DMA capabilities - platform specific */
	69	static const struct snd_pcm_hardware au1xpsc_pcm_hardware = {
	70	.info = SNDRV_PCM_INFO_MMAP \| SNDRV_PCM_INFO_MMAP_VALID \|
2008f137	71	SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BATCH,
4a161d23 ML	72	.period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES,
	73	.period_bytes_max = 4096 * 1024 - 1,
	74	.periods_min = 2,
	75	.periods_max = 4096, /* 2 to as-much-as-you-like */
	76	.buffer_bytes_max = 4096 * 1024 - 1,
	77	.fifo_size = 16, /* fifo entries of AC97/I2S PSC */
	78	};
	79
	80	static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd)
	81	{
963accbc	82	au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area,
4a161d23 ML	83	cd->period_bytes, DDMA_FLAGS_IE);
	84
	85	/* update next-to-queue period */
	86	++cd->q_period;
	87	cd->dma_area += cd->period_bytes;
	88	if (cd->q_period >= cd->periods) {
	89	cd->q_period = 0;
	90	cd->dma_area = cd->dma_area_s;
	91	}
	92	}
	93
	94	static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd)
	95	{
963accbc	96	au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area,
ea071cc7	97	cd->period_bytes, DDMA_FLAGS_IE);
4a161d23 ML	98
	99	/* update next-to-queue period */
	100	++cd->q_period;
	101	cd->dma_area += cd->period_bytes;
	102	if (cd->q_period >= cd->periods) {
	103	cd->q_period = 0;
	104	cd->dma_area = cd->dma_area_s;
	105	}
	106	}
	107
	108	static void au1x_pcm_dmatx_cb(int irq, void *dev_id)
	109	{
	110	struct au1xpsc_audio_dmadata *cd = dev_id;
	111
	112	cd->pos += cd->period_bytes;
	113	if (++cd->curr_period >= cd->periods) {
	114	cd->pos = 0;
	115	cd->curr_period = 0;
	116	}
	117	snd_pcm_period_elapsed(cd->substream);
	118	au1x_pcm_queue_tx(cd);
	119	}
	120
	121	static void au1x_pcm_dmarx_cb(int irq, void *dev_id)
	122	{
	123	struct au1xpsc_audio_dmadata *cd = dev_id;
	124
	125	cd->pos += cd->period_bytes;
	126	if (++cd->curr_period >= cd->periods) {
	127	cd->pos = 0;
	128	cd->curr_period = 0;
	129	}
	130	snd_pcm_period_elapsed(cd->substream);
	131	au1x_pcm_queue_rx(cd);
	132	}
	133
	134	static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd)
	135	{
	136	if (pcd->ddma_chan) {
	137	au1xxx_dbdma_stop(pcd->ddma_chan);
	138	au1xxx_dbdma_reset(pcd->ddma_chan);
	139	au1xxx_dbdma_chan_free(pcd->ddma_chan);
	140	pcd->ddma_chan = 0;
	141	pcd->msbits = 0;
	142	}
	143	}
	144
	145	/* in case of missing DMA ring or changed TX-source / RX-dest bit widths,
	146	* allocate (or reallocate) a 2-descriptor DMA ring with bit depth according
	147	* to ALSA-supplied sample depth. This is due to limitations in the dbdma api
	148	* (cannot adjust source/dest widths of already allocated descriptor ring).
	149	*/
	150	static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd,
	151	int stype, int msbits)
	152	{
	153	/* DMA only in 8/16/32 bit widths */
	154	if (msbits == 24)
	155	msbits = 32;
	156
	157	/* check current config: correct bits and descriptors allocated? */
	158	if ((pcd->ddma_chan) && (msbits == pcd->msbits))
	159	goto out; /* all ok! */
	160
	161	au1x_pcm_dbdma_free(pcd);
162
25942fdc	163	if (stype == SNDRV_PCM_STREAM_CAPTURE)
4a161d23 ML	164	pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id,
	165	DSCR_CMD0_ALWAYS,
	166	au1x_pcm_dmarx_cb, (void *)pcd);
	167	else
	168	pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
	169	pcd->ddma_id,
	170	au1x_pcm_dmatx_cb, (void *)pcd);
	171
	172	if (!pcd->ddma_chan)
c19a28e1	173	return -ENOMEM;
4a161d23 ML	174
	175	au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits);
	176	au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2);
	177
	178	pcd->msbits = msbits;
	179
	180	au1xxx_dbdma_stop(pcd->ddma_chan);
	181	au1xxx_dbdma_reset(pcd->ddma_chan);
	182
	183	out:
	184	return 0;
	185	}
	186
ffc4fdbb ML	187	static inline struct au1xpsc_audio_dmadata to_dmadata(struct snd_pcm_substream ss)
	188	{
	189	struct snd_soc_pcm_runtime *rtd = ss->private_data;
	190	struct au1xpsc_audio_dmadata *pcd =
	191	snd_soc_platform_get_drvdata(rtd->platform);
25942fdc	192	return &pcd[ss->stream];
ffc4fdbb ML	193	}
ffc4fdbb ML	194
4a161d23 ML	195	static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream,
	196	struct snd_pcm_hw_params *params)
	197	{
	198	struct snd_pcm_runtime *runtime = substream->runtime;
	199	struct au1xpsc_audio_dmadata *pcd;
	200	int stype, ret;
	201
	202	ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
	203	if (ret < 0)
	204	goto out;
	205
25942fdc	206	stype = substream->stream;
ffc4fdbb	207	pcd = to_dmadata(substream);
4a161d23	208
896491b3 HS	209	DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %zu "
896491b3 HS	210	"runtime->min_align %lu\n",
4a161d23 ML	211	(unsigned long)runtime->dma_area,
	212	(unsigned long)runtime->dma_addr, runtime->dma_bytes,
	213	runtime->min_align);
	214
	215	DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits,
	216	params_periods(params), params_period_bytes(params), stype);
	217
	218	ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits);
	219	if (ret) {
	220	MSG("DDMA channel (re)alloc failed!\n");
	221	goto out;
	222	}
	223
	224	pcd->substream = substream;
	225	pcd->period_bytes = params_period_bytes(params);
	226	pcd->periods = params_periods(params);
963accbc	227	pcd->dma_area_s = pcd->dma_area = runtime->dma_addr;
4a161d23 ML	228	pcd->q_period = 0;
	229	pcd->curr_period = 0;
	230	pcd->pos = 0;
	231
	232	ret = 0;
	233	out:
	234	return ret;
	235	}
	236
	237	static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream)
	238	{
	239	snd_pcm_lib_free_pages(substream);
	240	return 0;
	241	}
	242
	243	static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream)
	244	{
ffc4fdbb	245	struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
4a161d23 ML	246
	247	au1xxx_dbdma_reset(pcd->ddma_chan);
	248
25942fdc	249	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
4a161d23 ML	250	au1x_pcm_queue_rx(pcd);
	251	au1x_pcm_queue_rx(pcd);
	252	} else {
	253	au1x_pcm_queue_tx(pcd);
	254	au1x_pcm_queue_tx(pcd);
	255	}
	256
	257	return 0;
	258	}
	259
	260	static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	261	{
ffc4fdbb	262	u32 c = to_dmadata(substream)->ddma_chan;
4a161d23 ML	263
	264	switch (cmd) {
	265	case SNDRV_PCM_TRIGGER_START:
	266	case SNDRV_PCM_TRIGGER_RESUME:
	267	au1xxx_dbdma_start(c);
	268	break;
	269	case SNDRV_PCM_TRIGGER_STOP:
	270	case SNDRV_PCM_TRIGGER_SUSPEND:
	271	au1xxx_dbdma_stop(c);
	272	break;
	273	default:
	274	return -EINVAL;
	275	}
	276	return 0;
	277	}
	278
	279	static snd_pcm_uframes_t
	280	au1xpsc_pcm_pointer(struct snd_pcm_substream *substream)
	281	{
ffc4fdbb	282	return bytes_to_frames(substream->runtime, to_dmadata(substream)->pos);
4a161d23 ML	283	}
	284
	285	static int au1xpsc_pcm_open(struct snd_pcm_substream *substream)
	286	{
5b0912be ML	287	struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
5b0912be ML	288	struct snd_soc_pcm_runtime *rtd = substream->private_data;
25942fdc	289	int stype = substream->stream, *dmaids;
5b0912be ML	290
	291	dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	292	if (!dmaids)
	293	return -ENODEV; /* whoa, has ordering changed? */
	294
	295	pcd->ddma_id = dmaids[stype];
	296
4a161d23 ML	297	snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware);
	298	return 0;
	299	}
	300
	301	static int au1xpsc_pcm_close(struct snd_pcm_substream *substream)
	302	{
ffc4fdbb	303	au1x_pcm_dbdma_free(to_dmadata(substream));
4a161d23 ML	304	return 0;
	305	}
	306
b2a19d02	307	static struct snd_pcm_ops au1xpsc_pcm_ops = {
4a161d23 ML	308	.open = au1xpsc_pcm_open,
	309	.close = au1xpsc_pcm_close,
	310	.ioctl = snd_pcm_lib_ioctl,
	311	.hw_params = au1xpsc_pcm_hw_params,
	312	.hw_free = au1xpsc_pcm_hw_free,
	313	.prepare = au1xpsc_pcm_prepare,
	314	.trigger = au1xpsc_pcm_trigger,
	315	.pointer = au1xpsc_pcm_pointer,
	316	};
	317
552d1ef6	318	static int au1xpsc_pcm_new(struct snd_soc_pcm_runtime *rtd)
4a161d23	319	{
552d1ef6 LG	320	struct snd_card *card = rtd->card->snd_card;
	321	struct snd_pcm *pcm = rtd->pcm;
	322
4a161d23 ML	323	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
	324	card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1);
	325
	326	return 0;
	327	}
	328
0f83d639	329	/* au1xpsc audio platform */
bba59f33	330	static struct snd_soc_platform_driver au1xpsc_soc_platform = {
f0fba2ad	331	.ops = &au1xpsc_pcm_ops,
0f83d639	332	.pcm_new = au1xpsc_pcm_new,
0f83d639	333	};
0f83d639	334
5c658be0	335	static int au1xpsc_pcm_drvprobe(struct platform_device *pdev)
4a161d23	336	{
ffc4fdbb	337	struct au1xpsc_audio_dmadata *dmadata;
4a161d23	338
be547dd1 JL	339	dmadata = devm_kzalloc(&pdev->dev,
	340	2 * sizeof(struct au1xpsc_audio_dmadata),
	341	GFP_KERNEL);
ffc4fdbb	342	if (!dmadata)
4a161d23 ML	343	return -ENOMEM;
4a161d23 ML	344
ffc4fdbb	345	platform_set_drvdata(pdev, dmadata);
4a161d23	346
edd98a1a AL	347	return devm_snd_soc_register_platform(&pdev->dev,
edd98a1a AL	348	&au1xpsc_soc_platform);
4a161d23 ML	349	}
4a161d23 ML	350
0f83d639 ML	351	static struct platform_driver au1xpsc_pcm_driver = {
0f83d639 ML	352	.driver = {
ffc4fdbb	353	.name = "au1xpsc-pcm",
0f83d639 ML	354	},
0f83d639 ML	355	.probe = au1xpsc_pcm_drvprobe,
4a161d23	356	};
4a161d23	357
8a124f9c	358	module_platform_driver(au1xpsc_pcm_driver);
0f83d639	359
4a161d23 ML	360	MODULE_LICENSE("GPL");
4a161d23 ML	361	MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
0f83d639	362	MODULE_AUTHOR("Manuel Lauss");