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

/*
 * Au12x0/Au1550 PSC ALSA ASoC audio support.
 *
 * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
 *	Manuel Lauss <[email protected]>
 *
 * 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

#define AU1XPSC_PCM_FMTS					\
	(SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_U8 |	\
	 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |	\
	 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE |	\
	 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE |	\
	 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE |	\
	 0)

/* 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,
	.formats	  = AU1XPSC_PCM_FMTS,
	.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 == PCM_RX)
		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[SUBSTREAM_TYPE(ss)];
}

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_TYPE(substream);
	pcd = to_dmadata(substream);

	DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d "
	    "runtime->min_align %d\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_TYPE(substream) == PCM_RX) {
		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)
{
	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 void au1xpsc_pcm_free_dma_buffers(struct snd_pcm *pcm)
{
	snd_pcm_lib_preallocate_free_for_all(pcm);
}

static int au1xpsc_pcm_new(struct snd_card *card,
			   struct snd_soc_dai *dai,
			   struct snd_pcm *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 */
struct snd_soc_platform_driver au1xpsc_soc_platform = {
	.ops		= &au1xpsc_pcm_ops,
	.pcm_new	= au1xpsc_pcm_new,
	.pcm_free	= au1xpsc_pcm_free_dma_buffers,
};

static int __devinit au1xpsc_pcm_drvprobe(struct platform_device *pdev)
{
	struct au1xpsc_audio_dmadata *dmadata;
	struct resource *r;
	int ret;

	dmadata = kzalloc(2 * sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL);
	if (!dmadata)
		return -ENOMEM;

	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!r) {
		ret = -ENODEV;
		goto out1;
	}
	dmadata[PCM_TX].ddma_id = r->start;

	/* RX DMA */
	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	if (!r) {
		ret = -ENODEV;
		goto out1;
	}
	dmadata[PCM_RX].ddma_id = r->start;

	platform_set_drvdata(pdev, dmadata);

	ret = snd_soc_register_platform(&pdev->dev, &au1xpsc_soc_platform);
	if (!ret)
		return ret;

out1:
	kfree(dmadata);
	return ret;
}

static int __devexit au1xpsc_pcm_drvremove(struct platform_device *pdev)
{
	struct au1xpsc_audio_dmadata *dmadata = platform_get_drvdata(pdev);

	snd_soc_unregister_platform(&pdev->dev);
	kfree(dmadata);

	return 0;
}

static struct platform_driver au1xpsc_pcm_driver = {
	.driver	= {
		.name	= "au1xpsc-pcm",
		.owner	= THIS_MODULE,
	},
	.probe		= au1xpsc_pcm_drvprobe,
	.remove		= __devexit_p(au1xpsc_pcm_drvremove),
};

static int __init au1xpsc_audio_dbdma_load(void)
{
	return platform_driver_register(&au1xpsc_pcm_driver);
}

static void __exit au1xpsc_audio_dbdma_unload(void)
{
	platform_driver_unregister(&au1xpsc_pcm_driver);
}

module_init(au1xpsc_audio_dbdma_load);
module_exit(au1xpsc_audio_dbdma_unload);


struct platform_device *au1xpsc_pcm_add(struct platform_device *pdev)
{
	struct resource *res, *r;
	struct platform_device *pd;
	int id[2];
	int ret;

	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!r)
		return NULL;
	id[0] = r->start;

	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	if (!r)
		return NULL;
	id[1] = r->start;

	res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
	if (!res)
		return NULL;

	res[0].start = res[0].end = id[0];
	res[1].start = res[1].end = id[1];
	res[0].flags = res[1].flags = IORESOURCE_DMA;

	pd = platform_device_alloc("au1xpsc-pcm", pdev->id);
	if (!pd)
		goto out;

	pd->resource = res;
	pd->num_resources = 2;

	ret = platform_device_add(pd);
	if (!ret)
		return pd;

	platform_device_put(pd);
out:
	kfree(res);
	return NULL;
}
EXPORT_SYMBOL_GPL(au1xpsc_pcm_add);

void au1xpsc_pcm_destroy(struct platform_device *dmapd)
{
	if (dmapd)
		platform_device_unregister(dmapd);
}
EXPORT_SYMBOL_GPL(au1xpsc_pcm_destroy);

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 <[email protected]>
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
	68	#define AU1XPSC_PCM_FMTS \
	69	(SNDRV_PCM_FMTBIT_S8 \| SNDRV_PCM_FMTBIT_U8 \| \
	70	SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S16_BE \| \
	71	SNDRV_PCM_FMTBIT_U16_LE \| SNDRV_PCM_FMTBIT_U16_BE \| \
	72	SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_S32_BE \| \
	73	SNDRV_PCM_FMTBIT_U32_LE \| SNDRV_PCM_FMTBIT_U32_BE \| \
	74	0)
	75
	76	/* PCM hardware DMA capabilities - platform specific */
	77	static const struct snd_pcm_hardware au1xpsc_pcm_hardware = {
	78	.info = SNDRV_PCM_INFO_MMAP \| SNDRV_PCM_INFO_MMAP_VALID \|
2008f137	79	SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BATCH,
4a161d23 ML	80	.formats = AU1XPSC_PCM_FMTS,
	81	.period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES,
	82	.period_bytes_max = 4096 * 1024 - 1,
	83	.periods_min = 2,
	84	.periods_max = 4096, /* 2 to as-much-as-you-like */
	85	.buffer_bytes_max = 4096 * 1024 - 1,
	86	.fifo_size = 16, /* fifo entries of AC97/I2S PSC */
	87	};
	88
	89	static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd)
	90	{
963accbc	91	au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area,
4a161d23 ML	92	cd->period_bytes, DDMA_FLAGS_IE);
	93
	94	/* update next-to-queue period */
	95	++cd->q_period;
	96	cd->dma_area += cd->period_bytes;
	97	if (cd->q_period >= cd->periods) {
	98	cd->q_period = 0;
	99	cd->dma_area = cd->dma_area_s;
	100	}
	101	}
	102
	103	static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd)
	104	{
963accbc	105	au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area,
ea071cc7	106	cd->period_bytes, DDMA_FLAGS_IE);
4a161d23 ML	107
	108	/* update next-to-queue period */
	109	++cd->q_period;
	110	cd->dma_area += cd->period_bytes;
	111	if (cd->q_period >= cd->periods) {
	112	cd->q_period = 0;
	113	cd->dma_area = cd->dma_area_s;
	114	}
	115	}
	116
	117	static void au1x_pcm_dmatx_cb(int irq, void *dev_id)
	118	{
	119	struct au1xpsc_audio_dmadata *cd = dev_id;
	120
	121	cd->pos += cd->period_bytes;
	122	if (++cd->curr_period >= cd->periods) {
	123	cd->pos = 0;
	124	cd->curr_period = 0;
	125	}
	126	snd_pcm_period_elapsed(cd->substream);
	127	au1x_pcm_queue_tx(cd);
	128	}
	129
	130	static void au1x_pcm_dmarx_cb(int irq, void *dev_id)
	131	{
	132	struct au1xpsc_audio_dmadata *cd = dev_id;
	133
	134	cd->pos += cd->period_bytes;
	135	if (++cd->curr_period >= cd->periods) {
	136	cd->pos = 0;
	137	cd->curr_period = 0;
	138	}
	139	snd_pcm_period_elapsed(cd->substream);
	140	au1x_pcm_queue_rx(cd);
	141	}
	142
	143	static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd)
	144	{
	145	if (pcd->ddma_chan) {
	146	au1xxx_dbdma_stop(pcd->ddma_chan);
	147	au1xxx_dbdma_reset(pcd->ddma_chan);
	148	au1xxx_dbdma_chan_free(pcd->ddma_chan);
	149	pcd->ddma_chan = 0;
	150	pcd->msbits = 0;
	151	}
	152	}
	153
	154	/* in case of missing DMA ring or changed TX-source / RX-dest bit widths,
	155	* allocate (or reallocate) a 2-descriptor DMA ring with bit depth according
	156	* to ALSA-supplied sample depth. This is due to limitations in the dbdma api
	157	* (cannot adjust source/dest widths of already allocated descriptor ring).
	158	*/
	159	static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd,
	160	int stype, int msbits)
	161	{
	162	/* DMA only in 8/16/32 bit widths */
	163	if (msbits == 24)
	164	msbits = 32;
	165
	166	/* check current config: correct bits and descriptors allocated? */
	167	if ((pcd->ddma_chan) && (msbits == pcd->msbits))
	168	goto out; /* all ok! */
	169
	170	au1x_pcm_dbdma_free(pcd);
171
172	if (stype == PCM_RX)
173	pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id,
174	DSCR_CMD0_ALWAYS,
175	au1x_pcm_dmarx_cb, (void *)pcd);
176	else
177	pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
178	pcd->ddma_id,
179	au1x_pcm_dmatx_cb, (void *)pcd);
180
181	if (!pcd->ddma_chan)
c19a28e1	182	return -ENOMEM;
4a161d23 ML	183
	184	au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits);
	185	au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2);
	186
	187	pcd->msbits = msbits;
	188
	189	au1xxx_dbdma_stop(pcd->ddma_chan);
	190	au1xxx_dbdma_reset(pcd->ddma_chan);
	191
	192	out:
	193	return 0;
	194	}
	195
ffc4fdbb ML	196	static inline struct au1xpsc_audio_dmadata to_dmadata(struct snd_pcm_substream ss)
	197	{
	198	struct snd_soc_pcm_runtime *rtd = ss->private_data;
	199	struct au1xpsc_audio_dmadata *pcd =
	200	snd_soc_platform_get_drvdata(rtd->platform);
	201	return &pcd[SUBSTREAM_TYPE(ss)];
	202	}
	203
4a161d23 ML	204	static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream,
	205	struct snd_pcm_hw_params *params)
	206	{
	207	struct snd_pcm_runtime *runtime = substream->runtime;
	208	struct au1xpsc_audio_dmadata *pcd;
	209	int stype, ret;
	210
	211	ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
	212	if (ret < 0)
	213	goto out;
	214
	215	stype = SUBSTREAM_TYPE(substream);
ffc4fdbb	216	pcd = to_dmadata(substream);
4a161d23 ML	217
	218	DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d "
	219	"runtime->min_align %d\n",
	220	(unsigned long)runtime->dma_area,
	221	(unsigned long)runtime->dma_addr, runtime->dma_bytes,
	222	runtime->min_align);
	223
	224	DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits,
	225	params_periods(params), params_period_bytes(params), stype);
	226
	227	ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits);
	228	if (ret) {
	229	MSG("DDMA channel (re)alloc failed!\n");
	230	goto out;
	231	}
	232
	233	pcd->substream = substream;
	234	pcd->period_bytes = params_period_bytes(params);
	235	pcd->periods = params_periods(params);
963accbc	236	pcd->dma_area_s = pcd->dma_area = runtime->dma_addr;
4a161d23 ML	237	pcd->q_period = 0;
	238	pcd->curr_period = 0;
	239	pcd->pos = 0;
	240
	241	ret = 0;
	242	out:
	243	return ret;
	244	}
	245
	246	static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream)
	247	{
	248	snd_pcm_lib_free_pages(substream);
	249	return 0;
	250	}
	251
	252	static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream)
	253	{
ffc4fdbb	254	struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
4a161d23 ML	255
	256	au1xxx_dbdma_reset(pcd->ddma_chan);
	257
	258	if (SUBSTREAM_TYPE(substream) == PCM_RX) {
	259	au1x_pcm_queue_rx(pcd);
	260	au1x_pcm_queue_rx(pcd);
	261	} else {
	262	au1x_pcm_queue_tx(pcd);
	263	au1x_pcm_queue_tx(pcd);
	264	}
	265
	266	return 0;
	267	}
	268
	269	static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	270	{
ffc4fdbb	271	u32 c = to_dmadata(substream)->ddma_chan;
4a161d23 ML	272
	273	switch (cmd) {
	274	case SNDRV_PCM_TRIGGER_START:
	275	case SNDRV_PCM_TRIGGER_RESUME:
	276	au1xxx_dbdma_start(c);
	277	break;
	278	case SNDRV_PCM_TRIGGER_STOP:
	279	case SNDRV_PCM_TRIGGER_SUSPEND:
	280	au1xxx_dbdma_stop(c);
	281	break;
	282	default:
	283	return -EINVAL;
	284	}
	285	return 0;
	286	}
	287
	288	static snd_pcm_uframes_t
	289	au1xpsc_pcm_pointer(struct snd_pcm_substream *substream)
	290	{
ffc4fdbb	291	return bytes_to_frames(substream->runtime, to_dmadata(substream)->pos);
4a161d23 ML	292	}
	293
	294	static int au1xpsc_pcm_open(struct snd_pcm_substream *substream)
	295	{
	296	snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware);
	297	return 0;
	298	}
	299
	300	static int au1xpsc_pcm_close(struct snd_pcm_substream *substream)
	301	{
ffc4fdbb	302	au1x_pcm_dbdma_free(to_dmadata(substream));
4a161d23 ML	303	return 0;
	304	}
	305
b2a19d02	306	static struct snd_pcm_ops au1xpsc_pcm_ops = {
4a161d23 ML	307	.open = au1xpsc_pcm_open,
	308	.close = au1xpsc_pcm_close,
	309	.ioctl = snd_pcm_lib_ioctl,
	310	.hw_params = au1xpsc_pcm_hw_params,
	311	.hw_free = au1xpsc_pcm_hw_free,
	312	.prepare = au1xpsc_pcm_prepare,
	313	.trigger = au1xpsc_pcm_trigger,
	314	.pointer = au1xpsc_pcm_pointer,
	315	};
	316
	317	static void au1xpsc_pcm_free_dma_buffers(struct snd_pcm *pcm)
	318	{
	319	snd_pcm_lib_preallocate_free_for_all(pcm);
	320	}
	321
	322	static int au1xpsc_pcm_new(struct snd_card *card,
	323	struct snd_soc_dai *dai,
	324	struct snd_pcm *pcm)
	325	{
	326	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
	327	card->dev, AU1XPSC_BUFFER_MIN_BYTES, (4096 * 1024) - 1);
	328
	329	return 0;
	330	}
	331
0f83d639	332	/* au1xpsc audio platform */
f0fba2ad	333	struct snd_soc_platform_driver au1xpsc_soc_platform = {
f0fba2ad	334	.ops = &au1xpsc_pcm_ops,
0f83d639 ML	335	.pcm_new = au1xpsc_pcm_new,
	336	.pcm_free = au1xpsc_pcm_free_dma_buffers,
	337	};
0f83d639 ML	338
0f83d639 ML	339	static int __devinit au1xpsc_pcm_drvprobe(struct platform_device *pdev)
4a161d23	340	{
ffc4fdbb	341	struct au1xpsc_audio_dmadata *dmadata;
4a161d23 ML	342	struct resource *r;
	343	int ret;
	344
ffc4fdbb ML	345	dmadata = kzalloc(2 * sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL);
ffc4fdbb ML	346	if (!dmadata)
4a161d23 ML	347	return -ENOMEM;
	348
	349	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	350	if (!r) {
	351	ret = -ENODEV;
	352	goto out1;
	353	}
ffc4fdbb	354	dmadata[PCM_TX].ddma_id = r->start;
4a161d23 ML	355
4a161d23 ML	356	/* RX DMA */
4a161d23 ML	357	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	358	if (!r) {
	359	ret = -ENODEV;
ffc4fdbb	360	goto out1;
4a161d23	361	}
ffc4fdbb ML	362	dmadata[PCM_RX].ddma_id = r->start;
	363
	364	platform_set_drvdata(pdev, dmadata);
4a161d23	365
f0fba2ad	366	ret = snd_soc_register_platform(&pdev->dev, &au1xpsc_soc_platform);
0f83d639 ML	367	if (!ret)
0f83d639 ML	368	return ret;
4a161d23	369
4a161d23	370	out1:
ffc4fdbb	371	kfree(dmadata);
4a161d23 ML	372	return ret;
	373	}
	374
0f83d639	375	static int __devexit au1xpsc_pcm_drvremove(struct platform_device *pdev)
4a161d23	376	{
ffc4fdbb	377	struct au1xpsc_audio_dmadata *dmadata = platform_get_drvdata(pdev);
4a161d23	378
f0fba2ad	379	snd_soc_unregister_platform(&pdev->dev);
ffc4fdbb	380	kfree(dmadata);
4a161d23 ML	381
	382	return 0;
	383	}
	384
0f83d639 ML	385	static struct platform_driver au1xpsc_pcm_driver = {
0f83d639 ML	386	.driver = {
ffc4fdbb	387	.name = "au1xpsc-pcm",
0f83d639 ML	388	.owner = THIS_MODULE,
	389	},
	390	.probe = au1xpsc_pcm_drvprobe,
	391	.remove = __devexit_p(au1xpsc_pcm_drvremove),
4a161d23	392	};
4a161d23	393
0f83d639	394	static int __init au1xpsc_audio_dbdma_load(void)
4a161d23	395	{
0f83d639	396	return platform_driver_register(&au1xpsc_pcm_driver);
4a161d23 ML	397	}
4a161d23 ML	398
0f83d639	399	static void __exit au1xpsc_audio_dbdma_unload(void)
4a161d23	400	{
0f83d639 ML	401	platform_driver_unregister(&au1xpsc_pcm_driver);
	402	}
	403
	404	module_init(au1xpsc_audio_dbdma_load);
	405	module_exit(au1xpsc_audio_dbdma_unload);
	406
	407
	408	struct platform_device au1xpsc_pcm_add(struct platform_device pdev)
	409	{
	410	struct resource res, r;
	411	struct platform_device *pd;
	412	int id[2];
	413	int ret;
	414
	415	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	416	if (!r)
	417	return NULL;
	418	id[0] = r->start;
	419
	420	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	421	if (!r)
	422	return NULL;
	423	id[1] = r->start;
	424
	425	res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
	426	if (!res)
	427	return NULL;
	428
	429	res[0].start = res[0].end = id[0];
	430	res[1].start = res[1].end = id[1];
	431	res[0].flags = res[1].flags = IORESOURCE_DMA;
	432
ffc4fdbb	433	pd = platform_device_alloc("au1xpsc-pcm", pdev->id);
0f83d639 ML	434	if (!pd)
	435	goto out;
	436
	437	pd->resource = res;
	438	pd->num_resources = 2;
	439
	440	ret = platform_device_add(pd);
	441	if (!ret)
	442	return pd;
	443
efd9eb96	444	platform_device_put(pd);
0f83d639 ML	445	out:
	446	kfree(res);
	447	return NULL;
4a161d23	448	}
0f83d639	449	EXPORT_SYMBOL_GPL(au1xpsc_pcm_add);
4a161d23	450
0f83d639 ML	451	void au1xpsc_pcm_destroy(struct platform_device *dmapd)
0f83d639 ML	452	{
1bc80798	453	if (dmapd)
0f83d639	454	platform_device_unregister(dmapd);
0f83d639 ML	455	}
0f83d639 ML	456	EXPORT_SYMBOL_GPL(au1xpsc_pcm_destroy);
4a161d23 ML	457
	458	MODULE_LICENSE("GPL");
	459	MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
0f83d639	460	MODULE_AUTHOR("Manuel Lauss");