[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.
 *
 * NOTE: all of these drivers can only work with a SINGLE instance
 *	 of a PSC. Multiple independent audio devices are impossible
 *	 with ASoC v1.
 */


#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;
};

/* instance data. There can be only one, MacLeod!!!! */
static struct au1xpsc_audio_dmadata *au1xpsc_audio_pcmdma[2];

/*
 * 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 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 = au1xpsc_audio_pcmdma[stype];

	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 =
			au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(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 = au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(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,
		au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(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(au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(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;
}

static int au1xpsc_pcm_probe(struct platform_device *pdev)
{
	if (!au1xpsc_audio_pcmdma[PCM_TX] || !au1xpsc_audio_pcmdma[PCM_RX])
		return -ENODEV;

	return 0;
}

static int au1xpsc_pcm_remove(struct platform_device *pdev)
{
	return 0;
}

/* au1xpsc audio platform */
struct snd_soc_platform au1xpsc_soc_platform = {
	.name		= "au1xpsc-pcm-dbdma",
	.probe		= au1xpsc_pcm_probe,
	.remove		= au1xpsc_pcm_remove,
	.pcm_ops 	= &au1xpsc_pcm_ops,
	.pcm_new	= au1xpsc_pcm_new,
	.pcm_free	= au1xpsc_pcm_free_dma_buffers,
};
EXPORT_SYMBOL_GPL(au1xpsc_soc_platform);

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

	if (au1xpsc_audio_pcmdma[PCM_TX] || au1xpsc_audio_pcmdma[PCM_RX])
		return -EBUSY;

	/* TX DMA */
	au1xpsc_audio_pcmdma[PCM_TX]
		= kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL);
	if (!au1xpsc_audio_pcmdma[PCM_TX])
		return -ENOMEM;

	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!r) {
		ret = -ENODEV;
		goto out1;
	}
	(au1xpsc_audio_pcmdma[PCM_TX])->ddma_id = r->start;

	/* RX DMA */
	au1xpsc_audio_pcmdma[PCM_RX]
		= kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL);
	if (!au1xpsc_audio_pcmdma[PCM_RX])
		return -ENOMEM;

	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	if (!r) {
		ret = -ENODEV;
		goto out2;
	}
	(au1xpsc_audio_pcmdma[PCM_RX])->ddma_id = r->start;

	ret = snd_soc_register_platform(&au1xpsc_soc_platform);
	if (!ret)
		return ret;

out2:
	kfree(au1xpsc_audio_pcmdma[PCM_RX]);
	au1xpsc_audio_pcmdma[PCM_RX] = NULL;
out1:
	kfree(au1xpsc_audio_pcmdma[PCM_TX]);
	au1xpsc_audio_pcmdma[PCM_TX] = NULL;
	return ret;
}

static int __devexit au1xpsc_pcm_drvremove(struct platform_device *pdev)
{
	int i;

	snd_soc_unregister_platform(&au1xpsc_soc_platform);

	for (i = 0; i < 2; i++) {
		if (au1xpsc_audio_pcmdma[i]) {
			au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[i]);
			kfree(au1xpsc_audio_pcmdma[i]);
			au1xpsc_audio_pcmdma[i] = NULL;
		}
	}

	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)
{
	au1xpsc_audio_pcmdma[PCM_TX] = NULL;
	au1xpsc_audio_pcmdma[PCM_RX] = NULL;
	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", -1);
	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 <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	*
	13	* NOTE: all of these drivers can only work with a SINGLE instance
	14	* of a PSC. Multiple independent audio devices are impossible
	15	* with ASoC v1.
	16	*/
	17
	18
	19	#include <linux/module.h>
	20	#include <linux/init.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/slab.h>
	23	#include <linux/dma-mapping.h>
	24
	25	#include <sound/core.h>
	26	#include <sound/pcm.h>
	27	#include <sound/pcm_params.h>
	28	#include <sound/soc.h>
	29
	30	#include <asm/mach-au1x00/au1000.h>
	31	#include <asm/mach-au1x00/au1xxx_dbdma.h>
	32	#include <asm/mach-au1x00/au1xxx_psc.h>
	33
	34	#include "psc.h"
	35
	36	/#define PCM_DEBUG/
	37
	38	#define MSG(x...) printk(KERN_INFO "au1xpsc_pcm: " x)
	39	#ifdef PCM_DEBUG
	40	#define DBG MSG
	41	#else
	42	#define DBG(x...) do {} while (0)
	43	#endif
	44
	45	struct au1xpsc_audio_dmadata {
	46	/* DDMA control data */
	47	unsigned int ddma_id; /* DDMA direction ID for this PSC */
	48	u32 ddma_chan; /* DDMA context */
	49
	50	/* PCM context (for irq handlers) */
	51	struct snd_pcm_substream *substream;
	52	unsigned long curr_period; /* current segment DDMA is working on */
	53	unsigned long q_period; /* queue period(s) */
963accbc ML	54	dma_addr_t dma_area; /* address of queued DMA area */
963accbc ML	55	dma_addr_t dma_area_s; /* start address of DMA area */
4a161d23 ML	56	unsigned long pos; /* current byte position being played */
	57	unsigned long periods; /* number of SG segments in total */
	58	unsigned long period_bytes; /* size in bytes of one SG segment */
	59
	60	/* runtime data */
	61	int msbits;
	62	};
	63
	64	/* instance data. There can be only one, MacLeod!!!! */
	65	static struct au1xpsc_audio_dmadata *au1xpsc_audio_pcmdma[2];
	66
	67	/*
	68	* These settings are somewhat okay, at least on my machine audio plays
	69	* almost skip-free. Especially the 64kB buffer seems to help a LOT.
	70	*/
	71	#define AU1XPSC_PERIOD_MIN_BYTES 1024
	72	#define AU1XPSC_BUFFER_MIN_BYTES 65536
	73
	74	#define AU1XPSC_PCM_FMTS \
	75	(SNDRV_PCM_FMTBIT_S8 \| SNDRV_PCM_FMTBIT_U8 \| \
	76	SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S16_BE \| \
	77	SNDRV_PCM_FMTBIT_U16_LE \| SNDRV_PCM_FMTBIT_U16_BE \| \
	78	SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_S32_BE \| \
	79	SNDRV_PCM_FMTBIT_U32_LE \| SNDRV_PCM_FMTBIT_U32_BE \| \
	80	0)
	81
	82	/* PCM hardware DMA capabilities - platform specific */
	83	static const struct snd_pcm_hardware au1xpsc_pcm_hardware = {
	84	.info = SNDRV_PCM_INFO_MMAP \| SNDRV_PCM_INFO_MMAP_VALID \|
2008f137	85	SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BATCH,
4a161d23 ML	86	.formats = AU1XPSC_PCM_FMTS,
	87	.period_bytes_min = AU1XPSC_PERIOD_MIN_BYTES,
	88	.period_bytes_max = 4096 * 1024 - 1,
	89	.periods_min = 2,
	90	.periods_max = 4096, /* 2 to as-much-as-you-like */
	91	.buffer_bytes_max = 4096 * 1024 - 1,
	92	.fifo_size = 16, /* fifo entries of AC97/I2S PSC */
	93	};
	94
	95	static void au1x_pcm_queue_tx(struct au1xpsc_audio_dmadata *cd)
	96	{
963accbc	97	au1xxx_dbdma_put_source(cd->ddma_chan, cd->dma_area,
4a161d23 ML	98	cd->period_bytes, DDMA_FLAGS_IE);
	99
	100	/* update next-to-queue period */
	101	++cd->q_period;
	102	cd->dma_area += cd->period_bytes;
	103	if (cd->q_period >= cd->periods) {
	104	cd->q_period = 0;
	105	cd->dma_area = cd->dma_area_s;
	106	}
	107	}
	108
	109	static void au1x_pcm_queue_rx(struct au1xpsc_audio_dmadata *cd)
	110	{
963accbc	111	au1xxx_dbdma_put_dest(cd->ddma_chan, cd->dma_area,
ea071cc7	112	cd->period_bytes, DDMA_FLAGS_IE);
4a161d23 ML	113
	114	/* update next-to-queue period */
	115	++cd->q_period;
	116	cd->dma_area += cd->period_bytes;
	117	if (cd->q_period >= cd->periods) {
	118	cd->q_period = 0;
	119	cd->dma_area = cd->dma_area_s;
	120	}
	121	}
	122
	123	static void au1x_pcm_dmatx_cb(int irq, void *dev_id)
	124	{
	125	struct au1xpsc_audio_dmadata *cd = dev_id;
	126
	127	cd->pos += cd->period_bytes;
	128	if (++cd->curr_period >= cd->periods) {
	129	cd->pos = 0;
	130	cd->curr_period = 0;
	131	}
	132	snd_pcm_period_elapsed(cd->substream);
	133	au1x_pcm_queue_tx(cd);
	134	}
	135
	136	static void au1x_pcm_dmarx_cb(int irq, void *dev_id)
	137	{
	138	struct au1xpsc_audio_dmadata *cd = dev_id;
	139
	140	cd->pos += cd->period_bytes;
	141	if (++cd->curr_period >= cd->periods) {
	142	cd->pos = 0;
	143	cd->curr_period = 0;
	144	}
	145	snd_pcm_period_elapsed(cd->substream);
	146	au1x_pcm_queue_rx(cd);
	147	}
	148
	149	static void au1x_pcm_dbdma_free(struct au1xpsc_audio_dmadata *pcd)
	150	{
	151	if (pcd->ddma_chan) {
	152	au1xxx_dbdma_stop(pcd->ddma_chan);
	153	au1xxx_dbdma_reset(pcd->ddma_chan);
	154	au1xxx_dbdma_chan_free(pcd->ddma_chan);
	155	pcd->ddma_chan = 0;
	156	pcd->msbits = 0;
	157	}
	158	}
	159
	160	/* in case of missing DMA ring or changed TX-source / RX-dest bit widths,
	161	* allocate (or reallocate) a 2-descriptor DMA ring with bit depth according
	162	* to ALSA-supplied sample depth. This is due to limitations in the dbdma api
	163	* (cannot adjust source/dest widths of already allocated descriptor ring).
	164	*/
	165	static int au1x_pcm_dbdma_realloc(struct au1xpsc_audio_dmadata *pcd,
	166	int stype, int msbits)
	167	{
	168	/* DMA only in 8/16/32 bit widths */
	169	if (msbits == 24)
	170	msbits = 32;
	171
	172	/* check current config: correct bits and descriptors allocated? */
	173	if ((pcd->ddma_chan) && (msbits == pcd->msbits))
	174	goto out; /* all ok! */
	175
	176	au1x_pcm_dbdma_free(pcd);
177
178	if (stype == PCM_RX)
179	pcd->ddma_chan = au1xxx_dbdma_chan_alloc(pcd->ddma_id,
180	DSCR_CMD0_ALWAYS,
181	au1x_pcm_dmarx_cb, (void *)pcd);
182	else
183	pcd->ddma_chan = au1xxx_dbdma_chan_alloc(DSCR_CMD0_ALWAYS,
184	pcd->ddma_id,
185	au1x_pcm_dmatx_cb, (void *)pcd);
186
187	if (!pcd->ddma_chan)
c19a28e1	188	return -ENOMEM;
4a161d23 ML	189
	190	au1xxx_dbdma_set_devwidth(pcd->ddma_chan, msbits);
	191	au1xxx_dbdma_ring_alloc(pcd->ddma_chan, 2);
	192
	193	pcd->msbits = msbits;
	194
	195	au1xxx_dbdma_stop(pcd->ddma_chan);
	196	au1xxx_dbdma_reset(pcd->ddma_chan);
	197
	198	out:
	199	return 0;
	200	}
	201
	202	static int au1xpsc_pcm_hw_params(struct snd_pcm_substream *substream,
	203	struct snd_pcm_hw_params *params)
	204	{
	205	struct snd_pcm_runtime *runtime = substream->runtime;
	206	struct au1xpsc_audio_dmadata *pcd;
	207	int stype, ret;
	208
	209	ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
	210	if (ret < 0)
	211	goto out;
	212
	213	stype = SUBSTREAM_TYPE(substream);
	214	pcd = au1xpsc_audio_pcmdma[stype];
	215
	216	DBG("runtime->dma_area = 0x%08lx dma_addr_t = 0x%08lx dma_size = %d "
	217	"runtime->min_align %d\n",
	218	(unsigned long)runtime->dma_area,
	219	(unsigned long)runtime->dma_addr, runtime->dma_bytes,
	220	runtime->min_align);
	221
	222	DBG("bits %d frags %d frag_bytes %d is_rx %d\n", params->msbits,
	223	params_periods(params), params_period_bytes(params), stype);
	224
	225	ret = au1x_pcm_dbdma_realloc(pcd, stype, params->msbits);
	226	if (ret) {
	227	MSG("DDMA channel (re)alloc failed!\n");
	228	goto out;
	229	}
	230
	231	pcd->substream = substream;
	232	pcd->period_bytes = params_period_bytes(params);
	233	pcd->periods = params_periods(params);
963accbc	234	pcd->dma_area_s = pcd->dma_area = runtime->dma_addr;
4a161d23 ML	235	pcd->q_period = 0;
	236	pcd->curr_period = 0;
	237	pcd->pos = 0;
	238
	239	ret = 0;
	240	out:
	241	return ret;
	242	}
	243
	244	static int au1xpsc_pcm_hw_free(struct snd_pcm_substream *substream)
	245	{
	246	snd_pcm_lib_free_pages(substream);
	247	return 0;
	248	}
	249
	250	static int au1xpsc_pcm_prepare(struct snd_pcm_substream *substream)
	251	{
	252	struct au1xpsc_audio_dmadata *pcd =
	253	au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)];
	254
	255	au1xxx_dbdma_reset(pcd->ddma_chan);
	256
	257	if (SUBSTREAM_TYPE(substream) == PCM_RX) {
	258	au1x_pcm_queue_rx(pcd);
	259	au1x_pcm_queue_rx(pcd);
	260	} else {
	261	au1x_pcm_queue_tx(pcd);
	262	au1x_pcm_queue_tx(pcd);
	263	}
	264
	265	return 0;
	266	}
	267
	268	static int au1xpsc_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	269	{
	270	u32 c = au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->ddma_chan;
	271
	272	switch (cmd) {
	273	case SNDRV_PCM_TRIGGER_START:
	274	case SNDRV_PCM_TRIGGER_RESUME:
	275	au1xxx_dbdma_start(c);
	276	break;
	277	case SNDRV_PCM_TRIGGER_STOP:
	278	case SNDRV_PCM_TRIGGER_SUSPEND:
	279	au1xxx_dbdma_stop(c);
	280	break;
	281	default:
	282	return -EINVAL;
	283	}
	284	return 0;
	285	}
	286
	287	static snd_pcm_uframes_t
	288	au1xpsc_pcm_pointer(struct snd_pcm_substream *substream)
	289	{
	290	return bytes_to_frames(substream->runtime,
	291	au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]->pos);
	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	{
302	au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[SUBSTREAM_TYPE(substream)]);
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
	332	static int au1xpsc_pcm_probe(struct platform_device *pdev)
0f83d639 ML	333	{
	334	if (!au1xpsc_audio_pcmdma[PCM_TX] \|\| !au1xpsc_audio_pcmdma[PCM_RX])
	335	return -ENODEV;
	336
	337	return 0;
	338	}
	339
	340	static int au1xpsc_pcm_remove(struct platform_device *pdev)
	341	{
	342	return 0;
	343	}
	344
	345	/* au1xpsc audio platform */
	346	struct snd_soc_platform au1xpsc_soc_platform = {
	347	.name = "au1xpsc-pcm-dbdma",
	348	.probe = au1xpsc_pcm_probe,
	349	.remove = au1xpsc_pcm_remove,
	350	.pcm_ops = &au1xpsc_pcm_ops,
	351	.pcm_new = au1xpsc_pcm_new,
	352	.pcm_free = au1xpsc_pcm_free_dma_buffers,
	353	};
	354	EXPORT_SYMBOL_GPL(au1xpsc_soc_platform);
	355
	356	static int __devinit au1xpsc_pcm_drvprobe(struct platform_device *pdev)
4a161d23 ML	357	{
	358	struct resource *r;
	359	int ret;
	360
	361	if (au1xpsc_audio_pcmdma[PCM_TX] \|\| au1xpsc_audio_pcmdma[PCM_RX])
	362	return -EBUSY;
	363
	364	/* TX DMA */
	365	au1xpsc_audio_pcmdma[PCM_TX]
	366	= kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL);
	367	if (!au1xpsc_audio_pcmdma[PCM_TX])
	368	return -ENOMEM;
	369
	370	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	371	if (!r) {
	372	ret = -ENODEV;
	373	goto out1;
	374	}
	375	(au1xpsc_audio_pcmdma[PCM_TX])->ddma_id = r->start;
	376
	377	/* RX DMA */
	378	au1xpsc_audio_pcmdma[PCM_RX]
	379	= kzalloc(sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL);
	380	if (!au1xpsc_audio_pcmdma[PCM_RX])
	381	return -ENOMEM;
	382
	383	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	384	if (!r) {
	385	ret = -ENODEV;
	386	goto out2;
	387	}
	388	(au1xpsc_audio_pcmdma[PCM_RX])->ddma_id = r->start;
	389
0f83d639 ML	390	ret = snd_soc_register_platform(&au1xpsc_soc_platform);
	391	if (!ret)
	392	return ret;
4a161d23 ML	393
	394	out2:
	395	kfree(au1xpsc_audio_pcmdma[PCM_RX]);
	396	au1xpsc_audio_pcmdma[PCM_RX] = NULL;
	397	out1:
	398	kfree(au1xpsc_audio_pcmdma[PCM_TX]);
	399	au1xpsc_audio_pcmdma[PCM_TX] = NULL;
	400	return ret;
	401	}
	402
0f83d639	403	static int __devexit au1xpsc_pcm_drvremove(struct platform_device *pdev)
4a161d23 ML	404	{
	405	int i;
	406
0f83d639 ML	407	snd_soc_unregister_platform(&au1xpsc_soc_platform);
0f83d639 ML	408
4a161d23 ML	409	for (i = 0; i < 2; i++) {
	410	if (au1xpsc_audio_pcmdma[i]) {
	411	au1x_pcm_dbdma_free(au1xpsc_audio_pcmdma[i]);
	412	kfree(au1xpsc_audio_pcmdma[i]);
	413	au1xpsc_audio_pcmdma[i] = NULL;
	414	}
	415	}
	416
	417	return 0;
	418	}
	419
0f83d639 ML	420	static struct platform_driver au1xpsc_pcm_driver = {
	421	.driver = {
	422	.name = "au1xpsc-pcm",
	423	.owner = THIS_MODULE,
	424	},
	425	.probe = au1xpsc_pcm_drvprobe,
	426	.remove = __devexit_p(au1xpsc_pcm_drvremove),
4a161d23	427	};
4a161d23	428
0f83d639	429	static int __init au1xpsc_audio_dbdma_load(void)
4a161d23 ML	430	{
	431	au1xpsc_audio_pcmdma[PCM_TX] = NULL;
	432	au1xpsc_audio_pcmdma[PCM_RX] = NULL;
0f83d639	433	return platform_driver_register(&au1xpsc_pcm_driver);
4a161d23 ML	434	}
4a161d23 ML	435
0f83d639	436	static void __exit au1xpsc_audio_dbdma_unload(void)
4a161d23	437	{
0f83d639 ML	438	platform_driver_unregister(&au1xpsc_pcm_driver);
	439	}
	440
	441	module_init(au1xpsc_audio_dbdma_load);
	442	module_exit(au1xpsc_audio_dbdma_unload);
	443
	444
	445	struct platform_device au1xpsc_pcm_add(struct platform_device pdev)
	446	{
	447	struct resource res, r;
	448	struct platform_device *pd;
	449	int id[2];
	450	int ret;
	451
	452	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	453	if (!r)
	454	return NULL;
	455	id[0] = r->start;
	456
	457	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	458	if (!r)
	459	return NULL;
	460	id[1] = r->start;
	461
	462	res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
	463	if (!res)
	464	return NULL;
	465
	466	res[0].start = res[0].end = id[0];
	467	res[1].start = res[1].end = id[1];
	468	res[0].flags = res[1].flags = IORESOURCE_DMA;
	469
	470	pd = platform_device_alloc("au1xpsc-pcm", -1);
	471	if (!pd)
	472	goto out;
	473
	474	pd->resource = res;
	475	pd->num_resources = 2;
	476
	477	ret = platform_device_add(pd);
	478	if (!ret)
	479	return pd;
	480
efd9eb96	481	platform_device_put(pd);
0f83d639 ML	482	out:
	483	kfree(res);
	484	return NULL;
4a161d23	485	}
0f83d639	486	EXPORT_SYMBOL_GPL(au1xpsc_pcm_add);
4a161d23	487
0f83d639 ML	488	void au1xpsc_pcm_destroy(struct platform_device *dmapd)
0f83d639 ML	489	{
1bc80798	490	if (dmapd)
0f83d639	491	platform_device_unregister(dmapd);
0f83d639 ML	492	}
0f83d639 ML	493	EXPORT_SYMBOL_GPL(au1xpsc_pcm_destroy);
4a161d23 ML	494
	495	MODULE_LICENSE("GPL");
	496	MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
0f83d639	497	MODULE_AUTHOR("Manuel Lauss");