[linux.git] / sound / arm / pxa2xx-pcm-lib.c

/*
 * 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.
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/pxa2xx-lib.h>

#include <mach/dma.h>

#include "pxa2xx-pcm.h"

static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
	.info			= SNDRV_PCM_INFO_MMAP |
				  SNDRV_PCM_INFO_MMAP_VALID |
				  SNDRV_PCM_INFO_INTERLEAVED |
				  SNDRV_PCM_INFO_PAUSE |
				  SNDRV_PCM_INFO_RESUME,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
					SNDRV_PCM_FMTBIT_S24_LE |
					SNDRV_PCM_FMTBIT_S32_LE,
	.period_bytes_min	= 32,
	.period_bytes_max	= 8192 - 32,
	.periods_min		= 1,
	.periods_max		= PAGE_SIZE/sizeof(pxa_dma_desc),
	.buffer_bytes_max	= 128 * 1024,
	.fifo_size		= 32,
};

int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pxa2xx_runtime_data *rtd = runtime->private_data;
	size_t totsize = params_buffer_bytes(params);
	size_t period = params_period_bytes(params);
	pxa_dma_desc *dma_desc;
	dma_addr_t dma_buff_phys, next_desc_phys;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = totsize;

	dma_desc = rtd->dma_desc_array;
	next_desc_phys = rtd->dma_desc_array_phys;
	dma_buff_phys = runtime->dma_addr;
	do {
		next_desc_phys += sizeof(pxa_dma_desc);
		dma_desc->ddadr = next_desc_phys;
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			dma_desc->dsadr = dma_buff_phys;
			dma_desc->dtadr = rtd->params->dev_addr;
		} else {
			dma_desc->dsadr = rtd->params->dev_addr;
			dma_desc->dtadr = dma_buff_phys;
		}
		if (period > totsize)
			period = totsize;
		dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN;
		dma_desc++;
		dma_buff_phys += period;
	} while (totsize -= period);
	dma_desc[-1].ddadr = rtd->dma_desc_array_phys;

	return 0;
}
EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);

int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;

	if (rtd && rtd->params && rtd->params->drcmr)
		*rtd->params->drcmr = 0;

	snd_pcm_set_runtime_buffer(substream, NULL);
	return 0;
}
EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);

int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
		DCSR(prtd->dma_ch) = DCSR_RUN;
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		DCSR(prtd->dma_ch) &= ~DCSR_RUN;
		break;

	case SNDRV_PCM_TRIGGER_RESUME:
		DCSR(prtd->dma_ch) |= DCSR_RUN;
		break;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
		DCSR(prtd->dma_ch) |= DCSR_RUN;
		break;

	default:
		ret = -EINVAL;
	}

	return ret;
}
EXPORT_SYMBOL(pxa2xx_pcm_trigger);

snd_pcm_uframes_t
pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pxa2xx_runtime_data *prtd = runtime->private_data;

	dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
			 DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
	snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);

	if (x == runtime->buffer_size)
		x = 0;
	return x;
}
EXPORT_SYMBOL(pxa2xx_pcm_pointer);

int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;

	if (!prtd || !prtd->params)
		return 0;

	DCSR(prtd->dma_ch) &= ~DCSR_RUN;
	DCSR(prtd->dma_ch) = 0;
	DCMD(prtd->dma_ch) = 0;
	*prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD;

	return 0;
}
EXPORT_SYMBOL(__pxa2xx_pcm_prepare);

void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
{
	struct snd_pcm_substream *substream = dev_id;
	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	int dcsr;

	dcsr = DCSR(dma_ch);
	DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;

	if (dcsr & DCSR_ENDINTR) {
		snd_pcm_period_elapsed(substream);
	} else {
		printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
			rtd->params->name, dma_ch, dcsr);
		snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
	}
}
EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);

int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pxa2xx_runtime_data *rtd;
	int ret;

	runtime->hw = pxa2xx_pcm_hardware;

	/*
	 * For mysterious reasons (and despite what the manual says)
	 * playback samples are lost if the DMA count is not a multiple
	 * of the DMA burst size.  Let's add a rule to enforce that.
	 */
	ret = snd_pcm_hw_constraint_step(runtime, 0,
		SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
	if (ret)
		goto out;

	ret = snd_pcm_hw_constraint_step(runtime, 0,
		SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
	if (ret)
		goto out;

	ret = snd_pcm_hw_constraint_integer(runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		goto out;

	ret = -ENOMEM;
	rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
	if (!rtd)
		goto out;
	rtd->dma_desc_array =
		dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
				       &rtd->dma_desc_array_phys, GFP_KERNEL);
	if (!rtd->dma_desc_array)
		goto err1;

	rtd->dma_ch = -1;
	runtime->private_data = rtd;
	return 0;

 err1:
	kfree(rtd);
 out:
	return ret;
}
EXPORT_SYMBOL(__pxa2xx_pcm_open);

int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pxa2xx_runtime_data *rtd = runtime->private_data;

	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
			      rtd->dma_desc_array, rtd->dma_desc_array_phys);
	kfree(rtd);
	return 0;
}
EXPORT_SYMBOL(__pxa2xx_pcm_close);

int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
				     runtime->dma_area,
				     runtime->dma_addr,
				     runtime->dma_bytes);
}
EXPORT_SYMBOL(pxa2xx_pcm_mmap);

int pxa2xx_pcm_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 = pxa2xx_pcm_hardware.buffer_bytes_max;
	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = pcm->card->dev;
	buf->private_data = NULL;
	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
					   &buf->addr, GFP_KERNEL);
	if (!buf->area)
		return -ENOMEM;
	buf->bytes = size;
	return 0;
}
EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);

void pxa2xx_pcm_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_writecombine(pcm->card->dev, buf->bytes,
				      buf->area, buf->addr);
		buf->area = NULL;
	}
}
EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);

MODULE_AUTHOR("Nicolas Pitre");
MODULE_DESCRIPTION("Intel PXA2xx sound library");
MODULE_LICENSE("GPL");
Commit	Line	Data
a6d77317 DB	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License version 2 as
	4	* published by the Free Software Foundation.
	5	*/
	6
5a0e3ad6	7	#include <linux/slab.h>
a6d77317 DB	8	#include <linux/module.h>
	9	#include <linux/dma-mapping.h>
	10
	11	#include <sound/core.h>
	12	#include <sound/pcm.h>
	13	#include <sound/pcm_params.h>
	14	#include <sound/pxa2xx-lib.h>
	15
5742964e	16	#include <mach/dma.h>
a6d77317 DB	17
	18	#include "pxa2xx-pcm.h"
	19
	20	static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
	21	.info = SNDRV_PCM_INFO_MMAP \|
	22	SNDRV_PCM_INFO_MMAP_VALID \|
	23	SNDRV_PCM_INFO_INTERLEAVED \|
	24	SNDRV_PCM_INFO_PAUSE \|
	25	SNDRV_PCM_INFO_RESUME,
	26	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	27	SNDRV_PCM_FMTBIT_S24_LE \|
	28	SNDRV_PCM_FMTBIT_S32_LE,
	29	.period_bytes_min = 32,
	30	.period_bytes_max = 8192 - 32,
	31	.periods_min = 1,
	32	.periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
	33	.buffer_bytes_max = 128 * 1024,
	34	.fifo_size = 32,
	35	};
	36
	37	int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
	38	struct snd_pcm_hw_params *params)
	39	{
	40	struct snd_pcm_runtime *runtime = substream->runtime;
	41	struct pxa2xx_runtime_data *rtd = runtime->private_data;
	42	size_t totsize = params_buffer_bytes(params);
	43	size_t period = params_period_bytes(params);
	44	pxa_dma_desc *dma_desc;
	45	dma_addr_t dma_buff_phys, next_desc_phys;
	46
	47	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	48	runtime->dma_bytes = totsize;
	49
	50	dma_desc = rtd->dma_desc_array;
	51	next_desc_phys = rtd->dma_desc_array_phys;
	52	dma_buff_phys = runtime->dma_addr;
	53	do {
	54	next_desc_phys += sizeof(pxa_dma_desc);
	55	dma_desc->ddadr = next_desc_phys;
	56	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	57	dma_desc->dsadr = dma_buff_phys;
	58	dma_desc->dtadr = rtd->params->dev_addr;
	59	} else {
	60	dma_desc->dsadr = rtd->params->dev_addr;
	61	dma_desc->dtadr = dma_buff_phys;
	62	}
	63	if (period > totsize)
	64	period = totsize;
	65	dma_desc->dcmd = rtd->params->dcmd \| period \| DCMD_ENDIRQEN;
	66	dma_desc++;
	67	dma_buff_phys += period;
	68	} while (totsize -= period);
	69	dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
	70
	71	return 0;
	72	}
	73	EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
	74
	75	int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
	76	{
	77	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	78
b7d4de7f	79	if (rtd && rtd->params && rtd->params->drcmr)
a6d77317 DB	80	*rtd->params->drcmr = 0;
	81
	82	snd_pcm_set_runtime_buffer(substream, NULL);
	83	return 0;
	84	}
	85	EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
	86
	87	int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	88	{
	89	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
	90	int ret = 0;
	91
	92	switch (cmd) {
	93	case SNDRV_PCM_TRIGGER_START:
	94	DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
	95	DCSR(prtd->dma_ch) = DCSR_RUN;
	96	break;
	97
	98	case SNDRV_PCM_TRIGGER_STOP:
	99	case SNDRV_PCM_TRIGGER_SUSPEND:
	100	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	101	DCSR(prtd->dma_ch) &= ~DCSR_RUN;
	102	break;
	103
	104	case SNDRV_PCM_TRIGGER_RESUME:
	105	DCSR(prtd->dma_ch) \|= DCSR_RUN;
	106	break;
	107	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	108	DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
	109	DCSR(prtd->dma_ch) \|= DCSR_RUN;
	110	break;
	111
	112	default:
	113	ret = -EINVAL;
	114	}
	115
	116	return ret;
	117	}
	118	EXPORT_SYMBOL(pxa2xx_pcm_trigger);
	119
	120	snd_pcm_uframes_t
	121	pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
	122	{
	123	struct snd_pcm_runtime *runtime = substream->runtime;
	124	struct pxa2xx_runtime_data *prtd = runtime->private_data;
	125
	126	dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
	127	DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
	128	snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
	129
	130	if (x == runtime->buffer_size)
	131	x = 0;
	132	return x;
	133	}
	134	EXPORT_SYMBOL(pxa2xx_pcm_pointer);
	135
	136	int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
	137	{
	138	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
	139
f8bae4ca MB	140	if (!prtd \|\| !prtd->params)
	141	return 0;
	142
a6d77317 DB	143	DCSR(prtd->dma_ch) &= ~DCSR_RUN;
	144	DCSR(prtd->dma_ch) = 0;
	145	DCMD(prtd->dma_ch) = 0;
	146	*prtd->params->drcmr = prtd->dma_ch \| DRCMR_MAPVLD;
	147
	148	return 0;
	149	}
	150	EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
	151
	152	void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
	153	{
	154	struct snd_pcm_substream *substream = dev_id;
	155	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	156	int dcsr;
	157
	158	dcsr = DCSR(dma_ch);
	159	DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
	160
	161	if (dcsr & DCSR_ENDINTR) {
	162	snd_pcm_period_elapsed(substream);
	163	} else {
	164	printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
	165	rtd->params->name, dma_ch, dcsr);
	166	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
	167	}
	168	}
	169	EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
	170
	171	int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
	172	{
	173	struct snd_pcm_runtime *runtime = substream->runtime;
	174	struct pxa2xx_runtime_data *rtd;
	175	int ret;
	176
	177	runtime->hw = pxa2xx_pcm_hardware;
	178
	179	/*
	180	* For mysterious reasons (and despite what the manual says)
	181	* playback samples are lost if the DMA count is not a multiple
	182	* of the DMA burst size. Let's add a rule to enforce that.
	183	*/
	184	ret = snd_pcm_hw_constraint_step(runtime, 0,
	185	SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
	186	if (ret)
	187	goto out;
	188
	189	ret = snd_pcm_hw_constraint_step(runtime, 0,
	190	SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
	191	if (ret)
	192	goto out;
	193
	194	ret = snd_pcm_hw_constraint_integer(runtime,
	195	SNDRV_PCM_HW_PARAM_PERIODS);
	196	if (ret < 0)
	197	goto out;
	198
	199	ret = -ENOMEM;
13095c37	200	rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
a6d77317 DB	201	if (!rtd)
	202	goto out;
	203	rtd->dma_desc_array =
	204	dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	205	&rtd->dma_desc_array_phys, GFP_KERNEL);
	206	if (!rtd->dma_desc_array)
	207	goto err1;
	208
8727b909	209	rtd->dma_ch = -1;
a6d77317 DB	210	runtime->private_data = rtd;
	211	return 0;
	212
	213	err1:
	214	kfree(rtd);
	215	out:
	216	return ret;
	217	}
	218	EXPORT_SYMBOL(__pxa2xx_pcm_open);
	219
	220	int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
	221	{
	222	struct snd_pcm_runtime *runtime = substream->runtime;
	223	struct pxa2xx_runtime_data *rtd = runtime->private_data;
	224
	225	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	226	rtd->dma_desc_array, rtd->dma_desc_array_phys);
	227	kfree(rtd);
	228	return 0;
	229	}
	230	EXPORT_SYMBOL(__pxa2xx_pcm_close);
	231
	232	int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
	233	struct vm_area_struct *vma)
	234	{
	235	struct snd_pcm_runtime *runtime = substream->runtime;
	236	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	237	runtime->dma_area,
	238	runtime->dma_addr,
	239	runtime->dma_bytes);
	240	}
	241	EXPORT_SYMBOL(pxa2xx_pcm_mmap);
	242
	243	int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
	244	{
	245	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	246	struct snd_dma_buffer *buf = &substream->dma_buffer;
	247	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
	248	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	249	buf->dev.dev = pcm->card->dev;
	250	buf->private_data = NULL;
	251	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	252	&buf->addr, GFP_KERNEL);
	253	if (!buf->area)
	254	return -ENOMEM;
	255	buf->bytes = size;
	256	return 0;
	257	}
	258	EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
	259
	260	void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
	261	{
	262	struct snd_pcm_substream *substream;
	263	struct snd_dma_buffer *buf;
	264	int stream;
	265
	266	for (stream = 0; stream < 2; stream++) {
	267	substream = pcm->streams[stream].substream;
	268	if (!substream)
	269	continue;
	270	buf = &substream->dma_buffer;
	271	if (!buf->area)
	272	continue;
	273	dma_free_writecombine(pcm->card->dev, buf->bytes,
274	buf->area, buf->addr);
275	buf->area = NULL;
276	}
277	}
278	EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
279
280	MODULE_AUTHOR("Nicolas Pitre");
281	MODULE_DESCRIPTION("Intel PXA2xx sound library");
282	MODULE_LICENSE("GPL");