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 
ux500_pcm_prepare_slave_config(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct dma_slave_config * slave_config)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 = asoc_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(asoc_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 
ux500_pcm_register_platform(struct platform_device * pdev)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 
ux500_pcm_unregister_platform(struct platform_device * pdev)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