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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
37static 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
49static 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
87static 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
126static 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
133static 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
138int 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_NO_RESIDUE |
151 SND_DMAENGINE_PCM_FLAG_COMPAT);
152 if (ret < 0) {
153 dev_err(&pdev->dev,
154 "%s: ERROR: Failed to register platform '%s' (%d)!\n",
155 __func__, pdev->name, ret);
156 return ret;
157 }
158
159 return 0;
160}
161EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
162
163int ux500_pcm_unregister_platform(struct platform_device *pdev)
164{
165 snd_dmaengine_pcm_unregister(&pdev->dev);
166 return 0;
167}
168EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
169
