1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) ST-Ericsson SA 2012
4 *
5 * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
6 * Roger Nilsson <roger.xr.nilsson@stericsson.com>
7 * for ST-Ericsson.
8 */
9
10 #include <asm/page.h>
11
12 #include <linux/module.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/dmaengine.h>
15 #include <linux/slab.h>
16
17 #include <sound/pcm.h>
18 #include <sound/pcm_params.h>
19 #include <sound/soc.h>
20 #include <sound/dmaengine_pcm.h>
21
22 #include "ux500_msp_i2s.h"
23 #include "ux500_pcm.h"
24
25 #define UX500_PLATFORM_PERIODS_BYTES_MIN 128
26 #define UX500_PLATFORM_PERIODS_BYTES_MAX (64 * PAGE_SIZE)
27 #define UX500_PLATFORM_PERIODS_MIN 2
28 #define UX500_PLATFORM_PERIODS_MAX 48
29 #define UX500_PLATFORM_BUFFER_BYTES_MAX (2048 * PAGE_SIZE)
30
31 static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
32 struct snd_pcm_hw_params *params,
33 struct dma_slave_config *slave_config)
34 {
35 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
36 struct snd_dmaengine_dai_dma_data *snd_dma_params;
37 dma_addr_t dma_addr;
38 int ret;
39
40 snd_dma_params = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
41 dma_addr = snd_dma_params->addr;
42
43 ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
44 if (ret)
45 return ret;
46
47 slave_config->dst_maxburst = 4;
48 slave_config->src_maxburst = 4;
49
50 slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
51 slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
52
53 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
54 slave_config->dst_addr = dma_addr;
55 else
56 slave_config->src_addr = dma_addr;
57
58 return 0;
59 }
60
61 static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
62 .prepare_slave_config = ux500_pcm_prepare_slave_config,
63 };
64
65 int ux500_pcm_register_platform(struct platform_device *pdev)
66 {
67 int ret;
68
69 ret = snd_dmaengine_pcm_register(&pdev->dev,
70 &ux500_dmaengine_of_pcm_config, 0);
71 if (ret < 0) {
72 dev_err(&pdev->dev,
73 "%s: ERROR: Failed to register platform '%s' (%d)!\n",
74 __func__, pdev->name, ret);
75 return ret;
76 }
77
78 return 0;
79 }
80 EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
81
82 int ux500_pcm_unregister_platform(struct platform_device *pdev)
83 {
84 snd_dmaengine_pcm_unregister(&pdev->dev);
85 return 0;
86 }
87 EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
88
89 MODULE_AUTHOR("Ola Lilja");
90 MODULE_AUTHOR("Roger Nilsson");
91 MODULE_DESCRIPTION("ASoC UX500 driver");
92 MODULE_LICENSE("GPL v2");
93
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