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  * License terms:
10  */
11 
12 #include <asm/page.h>
13 
14 #include <linux/module.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/dmaengine.h>
17 #include <linux/slab.h>
18 #include <linux/platform_data/dma-ste-dma40.h>
19 
20 #include <sound/pcm.h>
21 #include <sound/pcm_params.h>
22 #include <sound/soc.h>
23 #include <sound/dmaengine_pcm.h>
24 
25 #include "ux500_msp_i2s.h"
26 #include "ux500_pcm.h"
27 
28 #define UX500_PLATFORM_PERIODS_BYTES_MIN	128
29 #define UX500_PLATFORM_PERIODS_BYTES_MAX	(64 * PAGE_SIZE)
30 #define UX500_PLATFORM_PERIODS_MIN		2
31 #define UX500_PLATFORM_PERIODS_MAX		48
32 #define UX500_PLATFORM_BUFFER_BYTES_MAX		(2048 * PAGE_SIZE)
33 
34 static const struct snd_pcm_hardware ux500_pcm_hw = {
35 	.info = SNDRV_PCM_INFO_INTERLEAVED |
36 		SNDRV_PCM_INFO_MMAP |
37 		SNDRV_PCM_INFO_RESUME |
38 		SNDRV_PCM_INFO_PAUSE,
39 	.buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
40 	.period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
41 	.period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
42 	.periods_min = UX500_PLATFORM_PERIODS_MIN,
43 	.periods_max = UX500_PLATFORM_PERIODS_MAX,
44 };
45 
ux500_pcm_request_chan(struct snd_soc_pcm_runtime * rtd,struct snd_pcm_substream * substream)46 static struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
47 	struct snd_pcm_substream *substream)
48 {
49 	struct snd_soc_dai *dai = asoc_rtd_to_cpu(rtd, 0);
50 	u16 per_data_width, mem_data_width;
51 	struct stedma40_chan_cfg *dma_cfg;
52 	struct ux500_msp_dma_params *dma_params;
53 
54 	dma_params = snd_soc_dai_get_dma_data(dai, substream);
55 	dma_cfg = dma_params->dma_cfg;
56 
57 	mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
58 
59 	switch (dma_params->data_size) {
60 	case 32:
61 		per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
62 		break;
63 	case 16:
64 		per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
65 		break;
66 	case 8:
67 		per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
68 		break;
69 	default:
70 		per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
71 	}
72 
73 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
74 		dma_cfg->src_info.data_width = mem_data_width;
75 		dma_cfg->dst_info.data_width = per_data_width;
76 	} else {
77 		dma_cfg->src_info.data_width = per_data_width;
78 		dma_cfg->dst_info.data_width = mem_data_width;
79 	}
80 
81 	return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
82 }
83 
ux500_pcm_prepare_slave_config(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct dma_slave_config * slave_config)84 static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
85 		struct snd_pcm_hw_params *params,
86 		struct dma_slave_config *slave_config)
87 {
88 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
89 	struct msp_i2s_platform_data *pdata = asoc_rtd_to_cpu(rtd, 0)->dev->platform_data;
90 	struct snd_dmaengine_dai_dma_data *snd_dma_params;
91 	struct ux500_msp_dma_params *ste_dma_params;
92 	dma_addr_t dma_addr;
93 	int ret;
94 
95 	if (pdata) {
96 		ste_dma_params =
97 			snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
98 		dma_addr = ste_dma_params->tx_rx_addr;
99 	} else {
100 		snd_dma_params =
101 			snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
102 		dma_addr = snd_dma_params->addr;
103 	}
104 
105 	ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
106 	if (ret)
107 		return ret;
108 
109 	slave_config->dst_maxburst = 4;
110 	slave_config->src_maxburst = 4;
111 
112 	slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
113 	slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
114 
115 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
116 		slave_config->dst_addr = dma_addr;
117 	else
118 		slave_config->src_addr = dma_addr;
119 
120 	return 0;
121 }
122 
123 static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = {
124 	.pcm_hardware = &ux500_pcm_hw,
125 	.compat_request_channel = ux500_pcm_request_chan,
126 	.prealloc_buffer_size = 128 * 1024,
127 	.prepare_slave_config = ux500_pcm_prepare_slave_config,
128 };
129 
130 static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
131 	.compat_request_channel = ux500_pcm_request_chan,
132 	.prepare_slave_config = ux500_pcm_prepare_slave_config,
133 };
134 
ux500_pcm_register_platform(struct platform_device * pdev)135 int ux500_pcm_register_platform(struct platform_device *pdev)
136 {
137 	const struct snd_dmaengine_pcm_config *pcm_config;
138 	struct device_node *np = pdev->dev.of_node;
139 	int ret;
140 
141 	if (np)
142 		pcm_config = &ux500_dmaengine_of_pcm_config;
143 	else
144 		pcm_config = &ux500_dmaengine_pcm_config;
145 
146 	ret = snd_dmaengine_pcm_register(&pdev->dev, pcm_config,
147 					 SND_DMAENGINE_PCM_FLAG_COMPAT);
148 	if (ret < 0) {
149 		dev_err(&pdev->dev,
150 			"%s: ERROR: Failed to register platform '%s' (%d)!\n",
151 			__func__, pdev->name, ret);
152 		return ret;
153 	}
154 
155 	return 0;
156 }
157 EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
158 
ux500_pcm_unregister_platform(struct platform_device * pdev)159 int ux500_pcm_unregister_platform(struct platform_device *pdev)
160 {
161 	snd_dmaengine_pcm_unregister(&pdev->dev);
162 	return 0;
163 }
164 EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
165 
166 MODULE_AUTHOR("Ola Lilja");
167 MODULE_AUTHOR("Roger Nilsson");
168 MODULE_DESCRIPTION("ASoC UX500 driver");
169 MODULE_LICENSE("GPL v2");
170