[deliverable/linux.git] / sound / soc / davinci / davinci-pcm.c

/*
 * ALSA PCM interface for the TI DAVINCI processor
 *
 * Author:      Vladimir Barinov, <vbarinov@embeddedalley.com>
 * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.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.
 */

#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/dma.h>

#include "davinci-pcm.h"

#define DAVINCI_PCM_DEBUG 0
#if DAVINCI_PCM_DEBUG
#define DPRINTK(x...) printk(KERN_DEBUG x)
#else
#define DPRINTK(x...)
#endif

static struct snd_pcm_hardware davinci_pcm_hardware = {
	.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
		 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
		 SNDRV_PCM_INFO_PAUSE),
	.formats = (SNDRV_PCM_FMTBIT_S16_LE),
	.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
		  SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
		  SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
		  SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
		  SNDRV_PCM_RATE_KNOT),
	.rate_min = 8000,
	.rate_max = 96000,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = 128 * 1024,
	.period_bytes_min = 32,
	.period_bytes_max = 8 * 1024,
	.periods_min = 16,
	.periods_max = 255,
	.fifo_size = 0,
};

struct davinci_runtime_data {
	spinlock_t lock;
	int period;		/* current DMA period */
	int master_lch;		/* Master DMA channel */
	int slave_lch;		/* Slave DMA channel */
	struct davinci_pcm_dma_params *params;	/* DMA params */
};

static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
{
	struct davinci_runtime_data *prtd = substream->runtime->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int lch = prtd->slave_lch;
	unsigned int period_size;
	unsigned int dma_offset;
	dma_addr_t dma_pos;
	dma_addr_t src, dst;
	unsigned short src_bidx, dst_bidx;
	unsigned int data_type;
	unsigned int count;

	period_size = snd_pcm_lib_period_bytes(substream);
	dma_offset = prtd->period * period_size;
	dma_pos = runtime->dma_addr + dma_offset;

	DPRINTK("audio_set_dma_params_play channel = %d dma_ptr = %x "
		"period_size=%x\n", lch, dma_pos, period_size);

	data_type = prtd->params->data_type;
	count = period_size / data_type;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		src = dma_pos;
		dst = prtd->params->dma_addr;
		src_bidx = data_type;
		dst_bidx = 0;
	} else {
		src = prtd->params->dma_addr;
		dst = dma_pos;
		src_bidx = 0;
		dst_bidx = data_type;
	}

	davinci_set_dma_src_params(lch, src, INCR, W8BIT);
	davinci_set_dma_dest_params(lch, dst, INCR, W8BIT);
	davinci_set_dma_src_index(lch, src_bidx, 0);
	davinci_set_dma_dest_index(lch, dst_bidx, 0);
	davinci_set_dma_transfer_params(lch, data_type, count, 1, 0, ASYNC);

	prtd->period++;
	if (unlikely(prtd->period >= runtime->periods))
		prtd->period = 0;
}

static void davinci_pcm_dma_irq(int lch, u16 ch_status, void *data)
{
	struct snd_pcm_substream *substream = data;
	struct davinci_runtime_data *prtd = substream->runtime->private_data;

	DPRINTK("lch=%d, status=0x%x\n", lch, ch_status);

	if (unlikely(ch_status != DMA_COMPLETE))
		return;

	if (snd_pcm_running(substream)) {
		snd_pcm_period_elapsed(substream);

		spin_lock(&prtd->lock);
		davinci_pcm_enqueue_dma(substream);
		spin_unlock(&prtd->lock);
	}
}

static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
{
	struct davinci_runtime_data *prtd = substream->runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct davinci_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data;
	int tcc = TCC_ANY;
	int ret;

	if (!dma_data)
		return -ENODEV;

	prtd->params = dma_data;

	/* Request master DMA channel */
	ret = davinci_request_dma(prtd->params->channel, prtd->params->name,
				  davinci_pcm_dma_irq, substream,
				  &prtd->master_lch, &tcc, EVENTQ_0);
	if (ret)
		return ret;

	/* Request slave DMA channel */
	ret = davinci_request_dma(PARAM_ANY, "Link",
				  NULL, NULL, &prtd->slave_lch, &tcc, EVENTQ_0);
	if (ret) {
		davinci_free_dma(prtd->master_lch);
		return ret;
	}

	/* Link slave DMA channel in loopback */
	davinci_dma_link_lch(prtd->slave_lch, prtd->slave_lch);

	return 0;
}

static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct davinci_runtime_data *prtd = substream->runtime->private_data;
	int ret = 0;

	spin_lock(&prtd->lock);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		davinci_start_dma(prtd->master_lch);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		davinci_stop_dma(prtd->master_lch);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	spin_unlock(&prtd->lock);

	return ret;
}

static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct davinci_runtime_data *prtd = substream->runtime->private_data;
	struct paramentry_descriptor temp;

	prtd->period = 0;
	davinci_pcm_enqueue_dma(substream);

	/* Get slave channel dma params for master channel startup */
	davinci_get_dma_params(prtd->slave_lch, &temp);
	davinci_set_dma_params(prtd->master_lch, &temp);

	return 0;
}

static snd_pcm_uframes_t
davinci_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct davinci_runtime_data *prtd = runtime->private_data;
	unsigned int offset;
	dma_addr_t count;
	dma_addr_t src, dst;

	spin_lock(&prtd->lock);

	davinci_dma_getposition(prtd->master_lch, &src, &dst);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		count = src - runtime->dma_addr;
	else
		count = dst - runtime->dma_addr;;

	spin_unlock(&prtd->lock);

	offset = bytes_to_frames(runtime, count);
	if (offset >= runtime->buffer_size)
		offset = 0;

	return offset;
}

static int davinci_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct davinci_runtime_data *prtd;
	int ret = 0;

	snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);

	prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
	if (prtd == NULL)
		return -ENOMEM;

	spin_lock_init(&prtd->lock);

	runtime->private_data = prtd;

	ret = davinci_pcm_dma_request(substream);
	if (ret) {
		printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
		kfree(prtd);
	}

	return ret;
}

static int davinci_pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct davinci_runtime_data *prtd = runtime->private_data;

	davinci_dma_unlink_lch(prtd->slave_lch, prtd->slave_lch);

	davinci_free_dma(prtd->slave_lch);
	davinci_free_dma(prtd->master_lch);

	kfree(prtd);

	return 0;
}

static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *hw_params)
{
	return snd_pcm_lib_malloc_pages(substream,
					params_buffer_bytes(hw_params));
}

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

static int davinci_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);
}

struct snd_pcm_ops davinci_pcm_ops = {
	.open = 	davinci_pcm_open,
	.close = 	davinci_pcm_close,
	.ioctl = 	snd_pcm_lib_ioctl,
	.hw_params = 	davinci_pcm_hw_params,
	.hw_free = 	davinci_pcm_hw_free,
	.prepare = 	davinci_pcm_prepare,
	.trigger = 	davinci_pcm_trigger,
	.pointer = 	davinci_pcm_pointer,
	.mmap = 	davinci_pcm_mmap,
};

static int davinci_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 = davinci_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);

	DPRINTK("preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
		(void *) buf->area, (void *) buf->addr, size);

	if (!buf->area)
		return -ENOMEM;

	buf->bytes = size;
	return 0;
}

static void davinci_pcm_free(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;
	}
}

static u64 davinci_pcm_dmamask = 0xffffffff;

static int davinci_pcm_new(struct snd_card *card,
			   struct snd_soc_dai *dai, struct snd_pcm *pcm)
{
	int ret;

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &davinci_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = 0xffffffff;

	if (dai->playback.channels_min) {
		ret = davinci_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			return ret;
	}

	if (dai->capture.channels_min) {
		ret = davinci_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			return ret;
	}

	return 0;
}

struct snd_soc_platform davinci_soc_platform = {
	.name = 	"davinci-audio",
	.pcm_ops = 	&davinci_pcm_ops,
	.pcm_new = 	davinci_pcm_new,
	.pcm_free = 	davinci_pcm_free,
};
EXPORT_SYMBOL_GPL(davinci_soc_platform);

static int __init davinci_soc_platform_init(void)
{
	return snd_soc_register_platform(&davinci_soc_platform);
}
module_init(davinci_soc_platform_init);

static void __exit davinci_soc_platform_exit(void)
{
	snd_soc_unregister_platform(&davinci_soc_platform);
}
module_exit(davinci_soc_platform_exit);

MODULE_AUTHOR("Vladimir Barinov");
MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
MODULE_LICENSE("GPL");
Commit	Line	Data
310355c1 VB	1	/*
	2	* ALSA PCM interface for the TI DAVINCI processor
	3	*
d6b52039	4	* Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
310355c1 VB	5	* Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
	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
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/slab.h>
	16	#include <linux/dma-mapping.h>
	17
	18	#include <sound/core.h>
	19	#include <sound/pcm.h>
	20	#include <sound/pcm_params.h>
	21	#include <sound/soc.h>
	22
	23	#include <asm/dma.h>
	24
	25	#include "davinci-pcm.h"
	26
	27	#define DAVINCI_PCM_DEBUG 0
	28	#if DAVINCI_PCM_DEBUG
	29	#define DPRINTK(x...) printk(KERN_DEBUG x)
	30	#else
	31	#define DPRINTK(x...)
	32	#endif
	33
	34	static struct snd_pcm_hardware davinci_pcm_hardware = {
	35	.info = (SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	36	SNDRV_PCM_INFO_MMAP \| SNDRV_PCM_INFO_MMAP_VALID \|
	37	SNDRV_PCM_INFO_PAUSE),
	38	.formats = (SNDRV_PCM_FMTBIT_S16_LE),
	39	.rates = (SNDRV_PCM_RATE_8000 \| SNDRV_PCM_RATE_16000 \|
	40	SNDRV_PCM_RATE_22050 \| SNDRV_PCM_RATE_32000 \|
	41	SNDRV_PCM_RATE_44100 \| SNDRV_PCM_RATE_48000 \|
	42	SNDRV_PCM_RATE_88200 \| SNDRV_PCM_RATE_96000 \|
	43	SNDRV_PCM_RATE_KNOT),
	44	.rate_min = 8000,
	45	.rate_max = 96000,
	46	.channels_min = 2,
	47	.channels_max = 2,
	48	.buffer_bytes_max = 128 * 1024,
	49	.period_bytes_min = 32,
	50	.period_bytes_max = 8 * 1024,
	51	.periods_min = 16,
	52	.periods_max = 255,
	53	.fifo_size = 0,
	54	};
	55
	56	struct davinci_runtime_data {
	57	spinlock_t lock;
	58	int period; /* current DMA period */
	59	int master_lch; /* Master DMA channel */
	60	int slave_lch; /* Slave DMA channel */
	61	struct davinci_pcm_dma_params params; / DMA params */
	62	};
	63
	64	static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
	65	{
	66	struct davinci_runtime_data *prtd = substream->runtime->private_data;
	67	struct snd_pcm_runtime *runtime = substream->runtime;
	68	int lch = prtd->slave_lch;
69	unsigned int period_size;
70	unsigned int dma_offset;
71	dma_addr_t dma_pos;
72	dma_addr_t src, dst;
73	unsigned short src_bidx, dst_bidx;
74	unsigned int data_type;
75	unsigned int count;
76
77	period_size = snd_pcm_lib_period_bytes(substream);
78	dma_offset = prtd->period * period_size;
79	dma_pos = runtime->dma_addr + dma_offset;
80
81	DPRINTK("audio_set_dma_params_play channel = %d dma_ptr = %x "
82	"period_size=%x\n", lch, dma_pos, period_size);
83
84	data_type = prtd->params->data_type;
85	count = period_size / data_type;
86
87	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
88	src = dma_pos;
89	dst = prtd->params->dma_addr;
90	src_bidx = data_type;
91	dst_bidx = 0;
92	} else {
93	src = prtd->params->dma_addr;
94	dst = dma_pos;
95	src_bidx = 0;
96	dst_bidx = data_type;
97	}
98
99	davinci_set_dma_src_params(lch, src, INCR, W8BIT);
100	davinci_set_dma_dest_params(lch, dst, INCR, W8BIT);
101	davinci_set_dma_src_index(lch, src_bidx, 0);
102	davinci_set_dma_dest_index(lch, dst_bidx, 0);
103	davinci_set_dma_transfer_params(lch, data_type, count, 1, 0, ASYNC);
104
105	prtd->period++;
106	if (unlikely(prtd->period >= runtime->periods))
107	prtd->period = 0;
108	}
109
110	static void davinci_pcm_dma_irq(int lch, u16 ch_status, void *data)
111	{
112	struct snd_pcm_substream *substream = data;
113	struct davinci_runtime_data *prtd = substream->runtime->private_data;
114
115	DPRINTK("lch=%d, status=0x%x\n", lch, ch_status);
116
117	if (unlikely(ch_status != DMA_COMPLETE))
118	return;
119
120	if (snd_pcm_running(substream)) {
121	snd_pcm_period_elapsed(substream);
122
123	spin_lock(&prtd->lock);
124	davinci_pcm_enqueue_dma(substream);
125	spin_unlock(&prtd->lock);
126	}
127	}
128
129	static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
130	{
131	struct davinci_runtime_data *prtd = substream->runtime->private_data;
132	struct snd_soc_pcm_runtime *rtd = substream->private_data;
133	struct davinci_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data;
134	int tcc = TCC_ANY;
135	int ret;
136
137	if (!dma_data)
138	return -ENODEV;
139
140	prtd->params = dma_data;
141
142	/* Request master DMA channel */
143	ret = davinci_request_dma(prtd->params->channel, prtd->params->name,
144	davinci_pcm_dma_irq, substream,
145	&prtd->master_lch, &tcc, EVENTQ_0);
146	if (ret)
147	return ret;
148
149	/* Request slave DMA channel */
150	ret = davinci_request_dma(PARAM_ANY, "Link",
151	NULL, NULL, &prtd->slave_lch, &tcc, EVENTQ_0);
152	if (ret) {
153	davinci_free_dma(prtd->master_lch);
154	return ret;
155	}
156
157	/* Link slave DMA channel in loopback */
158	davinci_dma_link_lch(prtd->slave_lch, prtd->slave_lch);
159
160	return 0;
161	}
162
163	static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
164	{
165	struct davinci_runtime_data *prtd = substream->runtime->private_data;
166	int ret = 0;
167
168	spin_lock(&prtd->lock);
169
170	switch (cmd) {
171	case SNDRV_PCM_TRIGGER_START:
172	case SNDRV_PCM_TRIGGER_RESUME:
173	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
174	davinci_start_dma(prtd->master_lch);
175	break;
176	case SNDRV_PCM_TRIGGER_STOP:
177	case SNDRV_PCM_TRIGGER_SUSPEND:
178	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
179	davinci_stop_dma(prtd->master_lch);
180	break;
181	default:
182	ret = -EINVAL;
183	break;
184	}
185
186	spin_unlock(&prtd->lock);
187
188	return ret;
189	}
190
191	static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
192	{
193	struct davinci_runtime_data *prtd = substream->runtime->private_data;
194	struct paramentry_descriptor temp;
195
196	prtd->period = 0;
197	davinci_pcm_enqueue_dma(substream);
198
199	/* Get slave channel dma params for master channel startup */
200	davinci_get_dma_params(prtd->slave_lch, &temp);
201	davinci_set_dma_params(prtd->master_lch, &temp);
202
203	return 0;
204	}
205
206	static snd_pcm_uframes_t
207	davinci_pcm_pointer(struct snd_pcm_substream *substream)
208	{
209	struct snd_pcm_runtime *runtime = substream->runtime;
210	struct davinci_runtime_data *prtd = runtime->private_data;
211	unsigned int offset;
212	dma_addr_t count;
213	dma_addr_t src, dst;
214
215	spin_lock(&prtd->lock);
216
217	davinci_dma_getposition(prtd->master_lch, &src, &dst);
218	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
219	count = src - runtime->dma_addr;
220	else
221	count = dst - runtime->dma_addr;;
222
223	spin_unlock(&prtd->lock);
224
225	offset = bytes_to_frames(runtime, count);
226	if (offset >= runtime->buffer_size)
227	offset = 0;
228
229	return offset;
230	}
231
232	static int davinci_pcm_open(struct snd_pcm_substream *substream)
233	{
234	struct snd_pcm_runtime *runtime = substream->runtime;
235	struct davinci_runtime_data *prtd;
236	int ret = 0;
237
238	snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
239
240	prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
241	if (prtd == NULL)
242	return -ENOMEM;
243
244	spin_lock_init(&prtd->lock);
245
246	runtime->private_data = prtd;
247
248	ret = davinci_pcm_dma_request(substream);
249	if (ret) {
250	printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
251	kfree(prtd);
252	}
253
254	return ret;
255	}
256
257	static int davinci_pcm_close(struct snd_pcm_substream *substream)
258	{
259	struct snd_pcm_runtime *runtime = substream->runtime;
260	struct davinci_runtime_data *prtd = runtime->private_data;
261
262	davinci_dma_unlink_lch(prtd->slave_lch, prtd->slave_lch);
263
264	davinci_free_dma(prtd->slave_lch);
265	davinci_free_dma(prtd->master_lch);
266
267	kfree(prtd);
268
269	return 0;
270	}
271
272	static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
273	struct snd_pcm_hw_params *hw_params)
274	{
275	return snd_pcm_lib_malloc_pages(substream,
276	params_buffer_bytes(hw_params));
277	}
278
279	static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
280	{
281	return snd_pcm_lib_free_pages(substream);
282	}
283
284	static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
285	struct vm_area_struct *vma)
286	{
287	struct snd_pcm_runtime *runtime = substream->runtime;
288
289	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
290	runtime->dma_area,
291	runtime->dma_addr,
292	runtime->dma_bytes);
293	}
294
295	struct snd_pcm_ops davinci_pcm_ops = {
296	.open = davinci_pcm_open,
297	.close = davinci_pcm_close,
298	.ioctl = snd_pcm_lib_ioctl,
299	.hw_params = davinci_pcm_hw_params,
300	.hw_free = davinci_pcm_hw_free,
301	.prepare = davinci_pcm_prepare,
302	.trigger = davinci_pcm_trigger,
303	.pointer = davinci_pcm_pointer,
304	.mmap = davinci_pcm_mmap,
305	};
306
307	static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
308	{
309	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
310	struct snd_dma_buffer *buf = &substream->dma_buffer;
311	size_t size = davinci_pcm_hardware.buffer_bytes_max;
312
313	buf->dev.type = SNDRV_DMA_TYPE_DEV;
314	buf->dev.dev = pcm->card->dev;
315	buf->private_data = NULL;
316	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
317	&buf->addr, GFP_KERNEL);
318
319	DPRINTK("preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
320	(void ) buf->area, (void ) buf->addr, size);
321
322	if (!buf->area)
323	return -ENOMEM;
324
325	buf->bytes = size;
326	return 0;
327	}
328
329	static void davinci_pcm_free(struct snd_pcm *pcm)
330	{
331	struct snd_pcm_substream *substream;
332	struct snd_dma_buffer *buf;
333	int stream;
334
335	for (stream = 0; stream < 2; stream++) {
336	substream = pcm->streams[stream].substream;
337	if (!substream)
338	continue;
339
340	buf = &substream->dma_buffer;
341	if (!buf->area)
342	continue;
343
344	dma_free_writecombine(pcm->card->dev, buf->bytes,
345	buf->area, buf->addr);
346	buf->area = NULL;
347	}
348	}
349
350	static u64 davinci_pcm_dmamask = 0xffffffff;
351
352	static int davinci_pcm_new(struct snd_card *card,
9cb132d7	353	struct snd_soc_dai dai, struct snd_pcm pcm)
310355c1 VB	354	{
	355	int ret;
	356
	357	if (!card->dev->dma_mask)
	358	card->dev->dma_mask = &davinci_pcm_dmamask;
	359	if (!card->dev->coherent_dma_mask)
	360	card->dev->coherent_dma_mask = 0xffffffff;
	361
	362	if (dai->playback.channels_min) {
	363	ret = davinci_pcm_preallocate_dma_buffer(pcm,
	364	SNDRV_PCM_STREAM_PLAYBACK);
	365	if (ret)
	366	return ret;
	367	}
	368
	369	if (dai->capture.channels_min) {
	370	ret = davinci_pcm_preallocate_dma_buffer(pcm,
	371	SNDRV_PCM_STREAM_CAPTURE);
	372	if (ret)
	373	return ret;
	374	}
	375
	376	return 0;
	377	}
	378
	379	struct snd_soc_platform davinci_soc_platform = {
	380	.name = "davinci-audio",
	381	.pcm_ops = &davinci_pcm_ops,
	382	.pcm_new = davinci_pcm_new,
	383	.pcm_free = davinci_pcm_free,
	384	};
	385	EXPORT_SYMBOL_GPL(davinci_soc_platform);
	386
c9b3a40f	387	static int __init davinci_soc_platform_init(void)
958e792c MB	388	{
	389	return snd_soc_register_platform(&davinci_soc_platform);
	390	}
	391	module_init(davinci_soc_platform_init);
	392
	393	static void __exit davinci_soc_platform_exit(void)
	394	{
	395	snd_soc_unregister_platform(&davinci_soc_platform);
	396	}
	397	module_exit(davinci_soc_platform_exit);
	398
310355c1 VB	399	MODULE_AUTHOR("Vladimir Barinov");
	400	MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
	401	MODULE_LICENSE("GPL");