Linux 4.15-rc1
[muen/linux.git] / sound / soc / ux500 / ux500_pcm.c
1 /*
2  * Copyright (C) ST-Ericsson SA 2012
3  *
4  * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
5  *         Roger Nilsson <roger.xr.nilsson@stericsson.com>
6  *         for ST-Ericsson.
7  *
8  * License terms:
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as published
12  * by the Free Software Foundation.
13  */
14
15 #include <asm/page.h>
16
17 #include <linux/module.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/dmaengine.h>
20 #include <linux/slab.h>
21 #include <linux/platform_data/dma-ste-dma40.h>
22
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
25 #include <sound/soc.h>
26 #include <sound/dmaengine_pcm.h>
27
28 #include "ux500_msp_i2s.h"
29 #include "ux500_pcm.h"
30
31 #define UX500_PLATFORM_PERIODS_BYTES_MIN        128
32 #define UX500_PLATFORM_PERIODS_BYTES_MAX        (64 * PAGE_SIZE)
33 #define UX500_PLATFORM_PERIODS_MIN              2
34 #define UX500_PLATFORM_PERIODS_MAX              48
35 #define UX500_PLATFORM_BUFFER_BYTES_MAX         (2048 * PAGE_SIZE)
36
37 static const struct snd_pcm_hardware ux500_pcm_hw = {
38         .info = SNDRV_PCM_INFO_INTERLEAVED |
39                 SNDRV_PCM_INFO_MMAP |
40                 SNDRV_PCM_INFO_RESUME |
41                 SNDRV_PCM_INFO_PAUSE,
42         .buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
43         .period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
44         .period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
45         .periods_min = UX500_PLATFORM_PERIODS_MIN,
46         .periods_max = UX500_PLATFORM_PERIODS_MAX,
47 };
48
49 static struct dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
50         struct snd_pcm_substream *substream)
51 {
52         struct snd_soc_dai *dai = rtd->cpu_dai;
53         u16 per_data_width, mem_data_width;
54         struct stedma40_chan_cfg *dma_cfg;
55         struct ux500_msp_dma_params *dma_params;
56
57         dma_params = snd_soc_dai_get_dma_data(dai, substream);
58         dma_cfg = dma_params->dma_cfg;
59
60         mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
61
62         switch (dma_params->data_size) {
63         case 32:
64                 per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
65                 break;
66         case 16:
67                 per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
68                 break;
69         case 8:
70                 per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
71                 break;
72         default:
73                 per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
74         }
75
76         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
77                 dma_cfg->src_info.data_width = mem_data_width;
78                 dma_cfg->dst_info.data_width = per_data_width;
79         } else {
80                 dma_cfg->src_info.data_width = per_data_width;
81                 dma_cfg->dst_info.data_width = mem_data_width;
82         }
83
84         return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
85 }
86
87 static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
88                 struct snd_pcm_hw_params *params,
89                 struct dma_slave_config *slave_config)
90 {
91         struct snd_soc_pcm_runtime *rtd = substream->private_data;
92         struct msp_i2s_platform_data *pdata = rtd->cpu_dai->dev->platform_data;
93         struct snd_dmaengine_dai_dma_data *snd_dma_params;
94         struct ux500_msp_dma_params *ste_dma_params;
95         dma_addr_t dma_addr;
96         int ret;
97
98         if (pdata) {
99                 ste_dma_params =
100                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
101                 dma_addr = ste_dma_params->tx_rx_addr;
102         } else {
103                 snd_dma_params =
104                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
105                 dma_addr = snd_dma_params->addr;
106         }
107
108         ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
109         if (ret)
110                 return ret;
111
112         slave_config->dst_maxburst = 4;
113         slave_config->src_maxburst = 4;
114
115         slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
116         slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
117
118         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
119                 slave_config->dst_addr = dma_addr;
120         else
121                 slave_config->src_addr = dma_addr;
122
123         return 0;
124 }
125
126 static const struct snd_dmaengine_pcm_config ux500_dmaengine_pcm_config = {
127         .pcm_hardware = &ux500_pcm_hw,
128         .compat_request_channel = ux500_pcm_request_chan,
129         .prealloc_buffer_size = 128 * 1024,
130         .prepare_slave_config = ux500_pcm_prepare_slave_config,
131 };
132
133 static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
134         .compat_request_channel = ux500_pcm_request_chan,
135         .prepare_slave_config = ux500_pcm_prepare_slave_config,
136 };
137
138 int ux500_pcm_register_platform(struct platform_device *pdev)
139 {
140         const struct snd_dmaengine_pcm_config *pcm_config;
141         struct device_node *np = pdev->dev.of_node;
142         int ret;
143
144         if (np)
145                 pcm_config = &ux500_dmaengine_of_pcm_config;
146         else
147                 pcm_config = &ux500_dmaengine_pcm_config;
148
149         ret = snd_dmaengine_pcm_register(&pdev->dev, pcm_config,
150                                          SND_DMAENGINE_PCM_FLAG_COMPAT);
151         if (ret < 0) {
152                 dev_err(&pdev->dev,
153                         "%s: ERROR: Failed to register platform '%s' (%d)!\n",
154                         __func__, pdev->name, ret);
155                 return ret;
156         }
157
158         return 0;
159 }
160 EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
161
162 int ux500_pcm_unregister_platform(struct platform_device *pdev)
163 {
164         snd_dmaengine_pcm_unregister(&pdev->dev);
165         return 0;
166 }
167 EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);