[deliverable/linux.git] / sound / soc / tegra / tegra_pcm.c

/*
 * tegra_pcm.c - Tegra PCM driver
 *
 * Author: Stephen Warren <swarren@nvidia.com>
 * Copyright (C) 2010 - NVIDIA, Inc.
 *
 * Based on code copyright/by:
 *
 * Copyright (c) 2009-2010, NVIDIA Corporation.
 * Scott Peterson <speterson@nvidia.com>
 * Vijay Mali <vmali@nvidia.com>
 *
 * Copyright (C) 2010 Google, Inc.
 * Iliyan Malchev <malchev@google.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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include "tegra_pcm.h"

static const struct snd_pcm_hardware tegra_pcm_hardware = {
	.info			= SNDRV_PCM_INFO_MMAP |
				  SNDRV_PCM_INFO_MMAP_VALID |
				  SNDRV_PCM_INFO_PAUSE |
				  SNDRV_PCM_INFO_RESUME |
				  SNDRV_PCM_INFO_INTERLEAVED,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
	.channels_min		= 2,
	.channels_max		= 2,
	.period_bytes_min	= 1024,
	.period_bytes_max	= PAGE_SIZE,
	.periods_min		= 2,
	.periods_max		= 8,
	.buffer_bytes_max	= PAGE_SIZE * 8,
	.fifo_size		= 4,
};

static void tegra_pcm_queue_dma(struct tegra_runtime_data *prtd)
{
	struct snd_pcm_substream *substream = prtd->substream;
	struct snd_dma_buffer *buf = &substream->dma_buffer;
	struct tegra_dma_req *dma_req;
	unsigned long addr;

	dma_req = &prtd->dma_req[prtd->dma_req_idx];
	prtd->dma_req_idx = 1 - prtd->dma_req_idx;

	addr = buf->addr + prtd->dma_pos;
	prtd->dma_pos += dma_req->size;
	if (prtd->dma_pos >= prtd->dma_pos_end)
		prtd->dma_pos = 0;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dma_req->source_addr = addr;
	else
		dma_req->dest_addr = addr;

	tegra_dma_enqueue_req(prtd->dma_chan, dma_req);
}

static void dma_complete_callback(struct tegra_dma_req *req)
{
	struct tegra_runtime_data *prtd = (struct tegra_runtime_data *)req->dev;
	struct snd_pcm_substream *substream = prtd->substream;
	struct snd_pcm_runtime *runtime = substream->runtime;

	spin_lock(&prtd->lock);

	if (!prtd->running) {
		spin_unlock(&prtd->lock);
		return;
	}

	if (++prtd->period_index >= runtime->periods)
		prtd->period_index = 0;

	tegra_pcm_queue_dma(prtd);

	spin_unlock(&prtd->lock);

	snd_pcm_period_elapsed(substream);
}

static void setup_dma_tx_request(struct tegra_dma_req *req,
					struct tegra_pcm_dma_params * dmap)
{
	req->complete = dma_complete_callback;
	req->to_memory = false;
	req->dest_addr = dmap->addr;
	req->dest_wrap = dmap->wrap;
	req->source_bus_width = 32;
	req->source_wrap = 0;
	req->dest_bus_width = dmap->width;
	req->req_sel = dmap->req_sel;
}

static void setup_dma_rx_request(struct tegra_dma_req *req,
					struct tegra_pcm_dma_params * dmap)
{
	req->complete = dma_complete_callback;
	req->to_memory = true;
	req->source_addr = dmap->addr;
	req->dest_wrap = 0;
	req->source_bus_width = dmap->width;
	req->source_wrap = dmap->wrap;
	req->dest_bus_width = 32;
	req->req_sel = dmap->req_sel;
}

static int tegra_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct tegra_runtime_data *prtd;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct tegra_pcm_dma_params * dmap;
	int ret = 0;

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

	runtime->private_data = prtd;
	prtd->substream = substream;

	spin_lock_init(&prtd->lock);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
		setup_dma_tx_request(&prtd->dma_req[0], dmap);
		setup_dma_tx_request(&prtd->dma_req[1], dmap);
	} else {
		dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
		setup_dma_rx_request(&prtd->dma_req[0], dmap);
		setup_dma_rx_request(&prtd->dma_req[1], dmap);
	}

	prtd->dma_req[0].dev = prtd;
	prtd->dma_req[1].dev = prtd;

	prtd->dma_chan = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT);
	if (IS_ERR(prtd->dma_chan)) {
		ret = PTR_ERR(prtd->dma_chan);
		goto err;
	}

	/* Set HW params now that initialization is complete */
	snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);

	/* Ensure that buffer size is a multiple of period size */
	ret = snd_pcm_hw_constraint_integer(runtime,
						SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		goto err;

	return 0;

err:
	if (prtd->dma_chan) {
		tegra_dma_free_channel(prtd->dma_chan);
	}

	kfree(prtd);

	return ret;
}

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

	tegra_dma_free_channel(prtd->dma_chan);

	kfree(prtd);

	return 0;
}

static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct tegra_runtime_data *prtd = runtime->private_data;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	prtd->dma_req[0].size = params_period_bytes(params);
	prtd->dma_req[1].size = prtd->dma_req[0].size;

	return 0;
}

static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
{
	snd_pcm_set_runtime_buffer(substream, NULL);

	return 0;
}

static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct tegra_runtime_data *prtd = runtime->private_data;
	unsigned long flags;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		prtd->dma_pos = 0;
		prtd->dma_pos_end = frames_to_bytes(runtime, runtime->periods * runtime->period_size);
		prtd->period_index = 0;
		prtd->dma_req_idx = 0;
		/* Fall-through */
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		spin_lock_irqsave(&prtd->lock, flags);
		prtd->running = 1;
		spin_unlock_irqrestore(&prtd->lock, flags);
		tegra_pcm_queue_dma(prtd);
		tegra_pcm_queue_dma(prtd);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		spin_lock_irqsave(&prtd->lock, flags);
		prtd->running = 0;
		spin_unlock_irqrestore(&prtd->lock, flags);
		tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[0]);
		tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[1]);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct tegra_runtime_data *prtd = runtime->private_data;

	return prtd->period_index * runtime->period_size;
}


static int tegra_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);
}

static struct snd_pcm_ops tegra_pcm_ops = {
	.open		= tegra_pcm_open,
	.close		= tegra_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= tegra_pcm_hw_params,
	.hw_free	= tegra_pcm_hw_free,
	.trigger	= tegra_pcm_trigger,
	.pointer	= tegra_pcm_pointer,
	.mmap		= tegra_pcm_mmap,
};

static int tegra_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 = tegra_pcm_hardware.buffer_bytes_max;

	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
						&buf->addr, GFP_KERNEL);
	if (!buf->area)
		return -ENOMEM;

	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = pcm->card->dev;
	buf->private_data = NULL;
	buf->bytes = size;

	return 0;
}

static void tegra_pcm_deallocate_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;

	if (!buf->area)
		return;

	dma_free_writecombine(pcm->card->dev, buf->bytes,
				buf->area, buf->addr);
	buf->area = NULL;
}

static u64 tegra_dma_mask = DMA_BIT_MASK(32);

static int tegra_pcm_new(struct snd_card *card,
				struct snd_soc_dai *dai, struct snd_pcm *pcm)
{
	int ret = 0;

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

	if (dai->driver->playback.channels_min) {
		ret = tegra_pcm_preallocate_dma_buffer(pcm,
						SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto err;
	}

	if (dai->driver->capture.channels_min) {
		ret = tegra_pcm_preallocate_dma_buffer(pcm,
						SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			goto err_free_play;
	}

	return 0;

err_free_play:
	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
err:
	return ret;
}

static void tegra_pcm_free(struct snd_pcm *pcm)
{
	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
}

struct snd_soc_platform_driver tegra_pcm_platform = {
	.ops		= &tegra_pcm_ops,
	.pcm_new	= tegra_pcm_new,
	.pcm_free	= tegra_pcm_free,
};

static int __devinit tegra_pcm_platform_probe(struct platform_device *pdev)
{
	return snd_soc_register_platform(&pdev->dev, &tegra_pcm_platform);
}

static int __devexit tegra_pcm_platform_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
}

static struct platform_driver tegra_pcm_driver = {
	.driver = {
		.name = "tegra-pcm-audio",
		.owner = THIS_MODULE,
	},
	.probe = tegra_pcm_platform_probe,
	.remove = __devexit_p(tegra_pcm_platform_remove),
};

static int __init snd_tegra_pcm_init(void)
{
	return platform_driver_register(&tegra_pcm_driver);
}
module_init(snd_tegra_pcm_init);

static void __exit snd_tegra_pcm_exit(void)
{
	platform_driver_unregister(&tegra_pcm_driver);
}
module_exit(snd_tegra_pcm_exit);

MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra PCM ASoC driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
7605eb5b SW	1	/*
	2	* tegra_pcm.c - Tegra PCM driver
	3	*
	4	* Author: Stephen Warren <swarren@nvidia.com>
	5	* Copyright (C) 2010 - NVIDIA, Inc.
	6	*
	7	* Based on code copyright/by:
	8	*
	9	* Copyright (c) 2009-2010, NVIDIA Corporation.
	10	* Scott Peterson <speterson@nvidia.com>
	11	* Vijay Mali <vmali@nvidia.com>
	12	*
	13	* Copyright (C) 2010 Google, Inc.
	14	* Iliyan Malchev <malchev@google.com>
	15	*
	16	* This program is free software; you can redistribute it and/or
	17	* modify it under the terms of the GNU General Public License
	18	* version 2 as published by the Free Software Foundation.
	19	*
	20	* This program is distributed in the hope that it will be useful, but
	21	* WITHOUT ANY WARRANTY; without even the implied warranty of
	22	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	23	* General Public License for more details.
	24	*
	25	* You should have received a copy of the GNU General Public License
	26	* along with this program; if not, write to the Free Software
	27	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	28	* 02110-1301 USA
	29	*
	30	*/
	31
	32	#include <linux/module.h>
	33	#include <linux/dma-mapping.h>
	34	#include <linux/slab.h>
	35	#include <sound/core.h>
	36	#include <sound/pcm.h>
	37	#include <sound/pcm_params.h>
	38	#include <sound/soc.h>
	39
	40	#include "tegra_pcm.h"
	41
	42	static const struct snd_pcm_hardware tegra_pcm_hardware = {
	43	.info = SNDRV_PCM_INFO_MMAP \|
	44	SNDRV_PCM_INFO_MMAP_VALID \|
	45	SNDRV_PCM_INFO_PAUSE \|
	46	SNDRV_PCM_INFO_RESUME \|
	47	SNDRV_PCM_INFO_INTERLEAVED,
	48	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	49	.channels_min = 2,
	50	.channels_max = 2,
	51	.period_bytes_min = 1024,
	52	.period_bytes_max = PAGE_SIZE,
	53	.periods_min = 2,
	54	.periods_max = 8,
	55	.buffer_bytes_max = PAGE_SIZE * 8,
	56	.fifo_size = 4,
	57	};
	58
	59	static void tegra_pcm_queue_dma(struct tegra_runtime_data *prtd)
	60	{
	61	struct snd_pcm_substream *substream = prtd->substream;
	62	struct snd_dma_buffer *buf = &substream->dma_buffer;
	63	struct tegra_dma_req *dma_req;
	64	unsigned long addr;
65
66	dma_req = &prtd->dma_req[prtd->dma_req_idx];
67	prtd->dma_req_idx = 1 - prtd->dma_req_idx;
68
69	addr = buf->addr + prtd->dma_pos;
70	prtd->dma_pos += dma_req->size;
71	if (prtd->dma_pos >= prtd->dma_pos_end)
72	prtd->dma_pos = 0;
73
74	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
75	dma_req->source_addr = addr;
76	else
77	dma_req->dest_addr = addr;
78
79	tegra_dma_enqueue_req(prtd->dma_chan, dma_req);
80	}
81
82	static void dma_complete_callback(struct tegra_dma_req *req)
83	{
84	struct tegra_runtime_data prtd = (struct tegra_runtime_data )req->dev;
85	struct snd_pcm_substream *substream = prtd->substream;
86	struct snd_pcm_runtime *runtime = substream->runtime;
87
88	spin_lock(&prtd->lock);
89
90	if (!prtd->running) {
91	spin_unlock(&prtd->lock);
92	return;
93	}
94
95	if (++prtd->period_index >= runtime->periods)
96	prtd->period_index = 0;
97
98	tegra_pcm_queue_dma(prtd);
99
100	spin_unlock(&prtd->lock);
101
102	snd_pcm_period_elapsed(substream);
103	}
104
105	static void setup_dma_tx_request(struct tegra_dma_req *req,
106	struct tegra_pcm_dma_params * dmap)
107	{
108	req->complete = dma_complete_callback;
109	req->to_memory = false;
110	req->dest_addr = dmap->addr;
111	req->dest_wrap = dmap->wrap;
112	req->source_bus_width = 32;
113	req->source_wrap = 0;
114	req->dest_bus_width = dmap->width;
115	req->req_sel = dmap->req_sel;
116	}
117
118	static void setup_dma_rx_request(struct tegra_dma_req *req,
119	struct tegra_pcm_dma_params * dmap)
120	{
121	req->complete = dma_complete_callback;
122	req->to_memory = true;
123	req->source_addr = dmap->addr;
124	req->dest_wrap = 0;
125	req->source_bus_width = dmap->width;
126	req->source_wrap = dmap->wrap;
127	req->dest_bus_width = 32;
128	req->req_sel = dmap->req_sel;
129	}
130
131	static int tegra_pcm_open(struct snd_pcm_substream *substream)
132	{
133	struct snd_pcm_runtime *runtime = substream->runtime;
134	struct tegra_runtime_data *prtd;
135	struct snd_soc_pcm_runtime *rtd = substream->private_data;
136	struct tegra_pcm_dma_params * dmap;
137	int ret = 0;
138
139	prtd = kzalloc(sizeof(struct tegra_runtime_data), GFP_KERNEL);
140	if (prtd == NULL)
141	return -ENOMEM;
142
143	runtime->private_data = prtd;
144	prtd->substream = substream;
145
146	spin_lock_init(&prtd->lock);
147
148	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
149	dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
150	setup_dma_tx_request(&prtd->dma_req[0], dmap);
151	setup_dma_tx_request(&prtd->dma_req[1], dmap);
152	} else {
153	dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
154	setup_dma_rx_request(&prtd->dma_req[0], dmap);
155	setup_dma_rx_request(&prtd->dma_req[1], dmap);
156	}
157
158	prtd->dma_req[0].dev = prtd;
159	prtd->dma_req[1].dev = prtd;
160
161	prtd->dma_chan = tegra_dma_allocate_channel(TEGRA_DMA_MODE_ONESHOT);
162	if (IS_ERR(prtd->dma_chan)) {
163	ret = PTR_ERR(prtd->dma_chan);
164	goto err;
165	}
166
167	/* Set HW params now that initialization is complete */
168	snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
169
170	/* Ensure that buffer size is a multiple of period size */
171	ret = snd_pcm_hw_constraint_integer(runtime,
172	SNDRV_PCM_HW_PARAM_PERIODS);
173	if (ret < 0)
174	goto err;
175
176	return 0;
177
178	err:
179	if (prtd->dma_chan) {
180	tegra_dma_free_channel(prtd->dma_chan);
181	}
182
183	kfree(prtd);
184
185	return ret;
186	}
187
188	static int tegra_pcm_close(struct snd_pcm_substream *substream)
189	{
190	struct snd_pcm_runtime *runtime = substream->runtime;
191	struct tegra_runtime_data *prtd = runtime->private_data;
192
193	tegra_dma_free_channel(prtd->dma_chan);
194
195	kfree(prtd);
196
197	return 0;
198	}
199
200	static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
201	struct snd_pcm_hw_params *params)
202	{
203	struct snd_pcm_runtime *runtime = substream->runtime;
204	struct tegra_runtime_data *prtd = runtime->private_data;
205
206	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
207
208	prtd->dma_req[0].size = params_period_bytes(params);
209	prtd->dma_req[1].size = prtd->dma_req[0].size;
210
211	return 0;
212	}
213
214	static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
215	{
216	snd_pcm_set_runtime_buffer(substream, NULL);
217
218	return 0;
219	}
220
221	static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
222	{
223	struct snd_pcm_runtime *runtime = substream->runtime;
224	struct tegra_runtime_data *prtd = runtime->private_data;
225	unsigned long flags;
226
227	switch (cmd) {
228	case SNDRV_PCM_TRIGGER_START:
229	prtd->dma_pos = 0;
230	prtd->dma_pos_end = frames_to_bytes(runtime, runtime->periods * runtime->period_size);
231	prtd->period_index = 0;
232	prtd->dma_req_idx = 0;
233	/* Fall-through */
234	case SNDRV_PCM_TRIGGER_RESUME:
235	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
236	spin_lock_irqsave(&prtd->lock, flags);
237	prtd->running = 1;
238	spin_unlock_irqrestore(&prtd->lock, flags);
239	tegra_pcm_queue_dma(prtd);
240	tegra_pcm_queue_dma(prtd);
241	break;
242	case SNDRV_PCM_TRIGGER_STOP:
243	case SNDRV_PCM_TRIGGER_SUSPEND:
244	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
245	spin_lock_irqsave(&prtd->lock, flags);
246	prtd->running = 0;
247	spin_unlock_irqrestore(&prtd->lock, flags);
248	tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[0]);
249	tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[1]);
250	break;
251	default:
252	return -EINVAL;
253	}
254
255	return 0;
256	}
257
258	static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
259	{
260	struct snd_pcm_runtime *runtime = substream->runtime;
261	struct tegra_runtime_data *prtd = runtime->private_data;
262
263	return prtd->period_index * runtime->period_size;
264	}
265
266
267	static int tegra_pcm_mmap(struct snd_pcm_substream *substream,
268	struct vm_area_struct *vma)
269	{
270	struct snd_pcm_runtime *runtime = substream->runtime;
271
272	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
273	runtime->dma_area,
274	runtime->dma_addr,
275	runtime->dma_bytes);
276	}
277
278	static struct snd_pcm_ops tegra_pcm_ops = {
279	.open = tegra_pcm_open,
280	.close = tegra_pcm_close,
281	.ioctl = snd_pcm_lib_ioctl,
282	.hw_params = tegra_pcm_hw_params,
283	.hw_free = tegra_pcm_hw_free,
284	.trigger = tegra_pcm_trigger,
285	.pointer = tegra_pcm_pointer,
286	.mmap = tegra_pcm_mmap,
287	};
288
289	static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
290	{
291	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
292	struct snd_dma_buffer *buf = &substream->dma_buffer;
293	size_t size = tegra_pcm_hardware.buffer_bytes_max;
294
295	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
296	&buf->addr, GFP_KERNEL);
297	if (!buf->area)
298	return -ENOMEM;
299
300	buf->dev.type = SNDRV_DMA_TYPE_DEV;
301	buf->dev.dev = pcm->card->dev;
302	buf->private_data = NULL;
303	buf->bytes = size;
304
305	return 0;
306	}
307
308	static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
309	{
310	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
311	struct snd_dma_buffer *buf = &substream->dma_buffer;
312
313	if (!buf->area)
314	return;
315
316	dma_free_writecombine(pcm->card->dev, buf->bytes,
317	buf->area, buf->addr);
318	buf->area = NULL;
319	}
320
321	static u64 tegra_dma_mask = DMA_BIT_MASK(32);
322
323	static int tegra_pcm_new(struct snd_card *card,
324	struct snd_soc_dai dai, struct snd_pcm pcm)
325	{
326	int ret = 0;
327
328	if (!card->dev->dma_mask)
329	card->dev->dma_mask = &tegra_dma_mask;
330	if (!card->dev->coherent_dma_mask)
331	card->dev->coherent_dma_mask = 0xffffffff;
332
333	if (dai->driver->playback.channels_min) {
334	ret = tegra_pcm_preallocate_dma_buffer(pcm,
335	SNDRV_PCM_STREAM_PLAYBACK);
336	if (ret)
337	goto err;
338	}
339
340	if (dai->driver->capture.channels_min) {
341	ret = tegra_pcm_preallocate_dma_buffer(pcm,
342	SNDRV_PCM_STREAM_CAPTURE);
343	if (ret)
344	goto err_free_play;
345	}
346
347	return 0;
348
349	err_free_play:
350	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
351	err:
352	return ret;
353	}
354
355	static void tegra_pcm_free(struct snd_pcm *pcm)
356	{
357	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
358	tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
359	}
360
361	struct snd_soc_platform_driver tegra_pcm_platform = {
362	.ops = &tegra_pcm_ops,
363	.pcm_new = tegra_pcm_new,
364	.pcm_free = tegra_pcm_free,
365	};
366
367	static int __devinit tegra_pcm_platform_probe(struct platform_device *pdev)
368	{
369	return snd_soc_register_platform(&pdev->dev, &tegra_pcm_platform);
370	}
371
372	static int __devexit tegra_pcm_platform_remove(struct platform_device *pdev)
373	{
374	snd_soc_unregister_platform(&pdev->dev);
375	return 0;
376	}
377
378	static struct platform_driver tegra_pcm_driver = {
379	.driver = {
380	.name = "tegra-pcm-audio",
381	.owner = THIS_MODULE,
382	},
383	.probe = tegra_pcm_platform_probe,
384	.remove = __devexit_p(tegra_pcm_platform_remove),
385	};
386
387	static int __init snd_tegra_pcm_init(void)
388	{
389	return platform_driver_register(&tegra_pcm_driver);
390	}
391	module_init(snd_tegra_pcm_init);
392
393	static void __exit snd_tegra_pcm_exit(void)
394	{
395	platform_driver_unregister(&tegra_pcm_driver);
396	}
397	module_exit(snd_tegra_pcm_exit);
398
399	MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
400	MODULE_DESCRIPTION("Tegra PCM ASoC driver");
401	MODULE_LICENSE("GPL");