summaryrefslogtreecommitdiffstats
path: root/kernel/sound/soc/ux500/ux500_pcm.c
blob: 51a66a87305ae0ad96b26206108f13bcec5a189f (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
/*
 * 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_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 const struct snd_pcm_hardware ux500_pcm_hw = {
	.info = SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_RESUME |
		SNDRV_PCM_INFO_PAUSE,
	.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 struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
	struct snd_pcm_substream *substream)
{
	struct snd_soc_dai *dai = rtd->cpu_dai;
	u16 per_data_width, mem_data_width;
	struct stedma40_chan_cfg *dma_cfg;
	struct ux500_msp_dma_params *dma_params;

	dma_params = snd_soc_dai_get_dma_data(dai, substream);
	dma_cfg = dma_params->dma_cfg;

	mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;

	switch (dma_params->data_size) {
	case 32:
		per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
		break;
	case 16:
		per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
		break;
	case 8:
		per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
		break;
	default:
		per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	}

	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;
	}

	return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
}

static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params,
		struct dma_slave_config *slave_config)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct msp_i2s_platform_data *pdata = rtd->cpu_dai->dev->platform_data;
	struct snd_dmaengine_dai_dma_data *snd_dma_params;
	struct ux500_msp_dma_params *ste_dma_params;
	dma_addr_t dma_addr;
	int ret;

	if (pdata) {
		ste_dma_params =
			snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
		dma_addr = ste_dma_params->tx_rx_addr;
	} else {
		snd_dma_params =
			snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
		dma_addr = snd_dma_params->addr;
	}

	ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
	if (ret)
		return ret;

	slave_config->dst_maxburst = 4;
	slave_config->src_maxburst = 4;

	slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
	slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		slave_config->dst_addr = dma_addr;
	else
		slave_config->src_addr = dma_addr;

	return 0;
}

static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = {
	.pcm_hardware = &ux500_pcm_hw,
	.compat_request_channel = ux500_pcm_request_chan,
	.prealloc_buffer_size = 128 * 1024,
	.prepare_slave_config = ux500_pcm_prepare_slave_config,
};

static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
	.compat_request_channel = ux500_pcm_request_chan,
	.prepare_slave_config = ux500_pcm_prepare_slave_config,
};

int ux500_pcm_register_platform(struct platform_device *pdev)
{
	const struct snd_dmaengine_pcm_config *pcm_config;
	struct device_node *np = pdev->dev.of_node;
	int ret;

	if (np)
		pcm_config = &ux500_dmaengine_of_pcm_config;
	else
		pcm_config = &ux500_dmaengine_pcm_config;

	ret = snd_dmaengine_pcm_register(&pdev->dev, pcm_config,
					 SND_DMAENGINE_PCM_FLAG_NO_RESIDUE |
					 SND_DMAENGINE_PCM_FLAG_COMPAT);
	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_dmaengine_pcm_unregister(&pdev->dev);
	return 0;
}
EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);