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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
34static 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
46static 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 = rtd->cpu_dai;
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
84static 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 = substream->private_data;
89 struct msp_i2s_platform_data *pdata = rtd->cpu_dai->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(rtd->cpu_dai, substream);
98 dma_addr = ste_dma_params->tx_rx_addr;
99 } else {
100 snd_dma_params =
101 snd_soc_dai_get_dma_data(rtd->cpu_dai, 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
123static 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
130static 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
135int 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}
157EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
158
159int ux500_pcm_unregister_platform(struct platform_device *pdev)
160{
161 snd_dmaengine_pcm_unregister(&pdev->dev);
162 return 0;
163}
164EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
165
166MODULE_AUTHOR("Ola Lilja");
167MODULE_AUTHOR("Roger Nilsson");
168MODULE_DESCRIPTION("ASoC UX500 driver");
169MODULE_LICENSE("GPL v2");
170
