summaryrefslogtreecommitdiffstats
path: root/sound/soc/ux500/ux500_pcm.c
blob: a7d4f04e5964e84f7cae14f413f1897d1c5e2c57 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
/*
 * Copyright (C) ST-Ericsson SA 2012
 *
 * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
 *         Roger Nilsson <roger.xr.nilsson@stericsson.com>
 *         for ST-Ericsson.
 *
 * License terms:
 *
 * 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 <asm/page.h>

#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/slab.h>
#include <linux/platform_data/dma-ste-dma40.h>

#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>

#include "ux500_msp_i2s.h"
#include "ux500_pcm.h"

#define UX500_PLATFORM_MIN_RATE 8000
#define UX500_PLATFORM_MAX_RATE 48000

#define UX500_PLATFORM_MIN_CHANNELS 1
#define UX500_PLATFORM_MAX_CHANNELS 8

#define UX500_PLATFORM_PERIODS_BYTES_MIN	128
#define UX500_PLATFORM_PERIODS_BYTES_MAX	(64 * PAGE_SIZE)
#define UX500_PLATFORM_PERIODS_MIN		2
#define UX500_PLATFORM_PERIODS_MAX		48
#define UX500_PLATFORM_BUFFER_BYTES_MAX		(2048 * PAGE_SIZE)

static struct snd_pcm_hardware ux500_pcm_hw = {
	.info = SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_RESUME |
		SNDRV_PCM_INFO_PAUSE,
	.formats = SNDRV_PCM_FMTBIT_S16_LE |
		SNDRV_PCM_FMTBIT_U16_LE |
		SNDRV_PCM_FMTBIT_S16_BE |
		SNDRV_PCM_FMTBIT_U16_BE,
	.rates = SNDRV_PCM_RATE_KNOT,
	.rate_min = UX500_PLATFORM_MIN_RATE,
	.rate_max = UX500_PLATFORM_MAX_RATE,
	.channels_min = UX500_PLATFORM_MIN_CHANNELS,
	.channels_max = UX500_PLATFORM_MAX_CHANNELS,
	.buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
	.period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
	.period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
	.periods_min = UX500_PLATFORM_PERIODS_MIN,
	.periods_max = UX500_PLATFORM_PERIODS_MAX,
};

static void ux500_pcm_dma_hw_free(struct device *dev,
				struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_dma_buffer *buf = runtime->dma_buffer_p;

	if (runtime->dma_area == NULL)
		return;

	if (buf != &substream->dma_buffer) {
		dma_free_coherent(buf->dev.dev, buf->bytes, buf->area,
				buf->addr);
		kfree(runtime->dma_buffer_p);
	}

	snd_pcm_set_runtime_buffer(substream, NULL);
}

static int ux500_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *dai = rtd->cpu_dai;
	struct device *dev = dai->dev;
	int ret;
	struct ux500_msp_dma_params *dma_params;
	u16 per_data_width, mem_data_width;
	struct stedma40_chan_cfg *dma_cfg;

	dev_dbg(dev, "%s: MSP %d (%s): Enter.\n", __func__, dai->id,
		snd_pcm_stream_str(substream));

	dev_dbg(dev, "%s: Set runtime hwparams.\n", __func__);
	snd_soc_set_runtime_hwparams(substream, &ux500_pcm_hw);

	mem_data_width = STEDMA40_HALFWORD_WIDTH;

	dma_params = snd_soc_dai_get_dma_data(dai, substream);
	switch (dma_params->data_size) {
	case 32:
		per_data_width = STEDMA40_WORD_WIDTH;
		break;
	case 16:
		per_data_width = STEDMA40_HALFWORD_WIDTH;
		break;
	case 8:
		per_data_width = STEDMA40_BYTE_WIDTH;
		break;
	default:
		per_data_width = STEDMA40_WORD_WIDTH;
		dev_warn(rtd->platform->dev,
			"%s: Unknown data-size (%d)! Assuming 32 bits.\n",
			__func__, dma_params->data_size);
	}

	dma_cfg = dma_params->dma_cfg;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		dma_cfg->src_info.data_width = mem_data_width;
		dma_cfg->dst_info.data_width = per_data_width;
	} else {
		dma_cfg->src_info.data_width = per_data_width;
		dma_cfg->dst_info.data_width = mem_data_width;
	}

	ret = snd_dmaengine_pcm_open_request_chan(substream, stedma40_filter,
			dma_cfg);
	if (ret) {
		dev_dbg(dai->dev,
			"%s: ERROR: snd_dmaengine_pcm_open failed (%d)!\n",
			__func__, ret);
		return ret;
	}

	return 0;
}

static int ux500_pcm_hw_params(struct snd_pcm_substream *substream,
			struct snd_pcm_hw_params *hw_params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_dma_buffer *buf = runtime->dma_buffer_p;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int ret = 0;
	int size;

	dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);

	size = params_buffer_bytes(hw_params);

	if (buf) {
		if (buf->bytes >= size)
			goto out;
		ux500_pcm_dma_hw_free(NULL, substream);
	}

	if (substream->dma_buffer.area != NULL &&
		substream->dma_buffer.bytes >= size) {
		buf = &substream->dma_buffer;
	} else {
		buf = kmalloc(sizeof(struct snd_dma_buffer), GFP_KERNEL);
		if (!buf)
			goto nomem;

		buf->dev.type = SNDRV_DMA_TYPE_DEV;
		buf->dev.dev = NULL;
		buf->area = dma_alloc_coherent(NULL, size, &buf->addr,
					GFP_KERNEL);
		buf->bytes = size;
		buf->private_data = NULL;

		if (!buf->area)
			goto free;
	}
	snd_pcm_set_runtime_buffer(substream, buf);
	ret = 1;
 out:
	runtime->dma_bytes = size;
	return ret;

 free:
	kfree(buf);
 nomem:
	return -ENOMEM;
}

static int ux500_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);

	ux500_pcm_dma_hw_free(NULL, substream);

	return 0;
}

static int ux500_pcm_mmap(struct snd_pcm_substream *substream,
			struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	dev_dbg(rtd->platform->dev, "%s: Enter.\n", __func__);

	return dma_mmap_coherent(NULL, vma, runtime->dma_area,
				runtime->dma_addr, runtime->dma_bytes);
}

static struct snd_pcm_ops ux500_pcm_ops = {
	.open		= ux500_pcm_open,
	.close		= snd_dmaengine_pcm_close_release_chan,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= ux500_pcm_hw_params,
	.hw_free	= ux500_pcm_hw_free,
	.trigger	= snd_dmaengine_pcm_trigger,
	.pointer	= snd_dmaengine_pcm_pointer_no_residue,
	.mmap		= ux500_pcm_mmap
};

int ux500_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_pcm *pcm = rtd->pcm;

	dev_dbg(rtd->platform->dev, "%s: Enter (id = '%s').\n", __func__,
		pcm->id);

	pcm->info_flags = 0;

	return 0;
}

static struct snd_soc_platform_driver ux500_pcm_soc_drv = {
	.ops		= &ux500_pcm_ops,
	.pcm_new        = ux500_pcm_new,
};

int ux500_pcm_register_platform(struct platform_device *pdev)
{
	int ret;

	ret = snd_soc_register_platform(&pdev->dev, &ux500_pcm_soc_drv);
	if (ret < 0) {
		dev_err(&pdev->dev,
			"%s: ERROR: Failed to register platform '%s' (%d)!\n",
			__func__, pdev->name, ret);
		return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);

int ux500_pcm_unregister_platform(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);

	return 0;
}
EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
OpenPOWER on IntegriCloud