1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/slab.h>
4 #include <linux/module.h>
5 #include <linux/dma-mapping.h>
6 #include <linux/dmaengine.h>
7 #include <linux/dma/pxa-dma.h>
8
9 #include <sound/core.h>
10 #include <sound/pcm.h>
11 #include <sound/pcm_params.h>
12 #include <sound/pxa2xx-lib.h>
13 #include <sound/dmaengine_pcm.h>
14
15 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
16 .info = SNDRV_PCM_INFO_MMAP |
17 SNDRV_PCM_INFO_MMAP_VALID |
18 SNDRV_PCM_INFO_INTERLEAVED |
19 SNDRV_PCM_INFO_PAUSE |
20 SNDRV_PCM_INFO_RESUME,
21 .formats = SNDRV_PCM_FMTBIT_S16_LE |
22 SNDRV_PCM_FMTBIT_S24_LE |
23 SNDRV_PCM_FMTBIT_S32_LE,
24 .period_bytes_min = 32,
25 .period_bytes_max = 8192 - 32,
26 .periods_min = 1,
27 .periods_max = 256,
28 .buffer_bytes_max = 128 * 1024,
29 .fifo_size = 32,
30 };
31
32 int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
33 struct snd_pcm_hw_params *params)
34 {
35 struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
36 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
37 struct snd_dmaengine_dai_dma_data *dma_params;
38 struct dma_slave_config config;
39 int ret;
40
41 dma_params = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
42 if (!dma_params)
43 return 0;
44
45 ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
46 if (ret)
47 return ret;
48
49 snd_dmaengine_pcm_set_config_from_dai_data(substream,
50 snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream),
51 &config);
52
53 ret = dmaengine_slave_config(chan, &config);
54 if (ret)
55 return ret;
56
57 return 0;
58 }
59 EXPORT_SYMBOL(pxa2xx_pcm_hw_params);
60
61 int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
62 {
63 return snd_dmaengine_pcm_trigger(substream, cmd);
64 }
65 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
66
67 snd_pcm_uframes_t
68 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
69 {
70 return snd_dmaengine_pcm_pointer(substream);
71 }
72 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
73
74 int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
75 {
76 return 0;
77 }
78 EXPORT_SYMBOL(pxa2xx_pcm_prepare);
79
80 int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
81 {
82 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
83 struct snd_pcm_runtime *runtime = substream->runtime;
84 struct snd_dmaengine_dai_dma_data *dma_params;
85 int ret;
86
87 runtime->hw = pxa2xx_pcm_hardware;
88
89 dma_params = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
90 if (!dma_params)
91 return 0;
92
93 /*
94 * For mysterious reasons (and despite what the manual says)
95 * playback samples are lost if the DMA count is not a multiple
96 * of the DMA burst size. Let's add a rule to enforce that.
97 */
98 ret = snd_pcm_hw_constraint_step(runtime, 0,
99 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
100 if (ret)
101 return ret;
102
103 ret = snd_pcm_hw_constraint_step(runtime, 0,
104 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
105 if (ret)
106 return ret;
107
108 ret = snd_pcm_hw_constraint_integer(runtime,
109 SNDRV_PCM_HW_PARAM_PERIODS);
110 if (ret < 0)
111 return ret;
112
113 return snd_dmaengine_pcm_open(
114 substream, dma_request_slave_channel(snd_soc_rtd_to_cpu(rtd, 0)->dev,
115 dma_params->chan_name));
116 }
117 EXPORT_SYMBOL(pxa2xx_pcm_open);
118
119 int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
120 {
121 return snd_dmaengine_pcm_close_release_chan(substream);
122 }
123 EXPORT_SYMBOL(pxa2xx_pcm_close);
124
125 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm)
126 {
127 size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
128
129 return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC,
130 pcm->card->dev, size);
131 }
132 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
133
134 int pxa2xx_soc_pcm_new(struct snd_soc_component *component,
135 struct snd_soc_pcm_runtime *rtd)
136 {
137 struct snd_card *card = rtd->card->snd_card;
138 struct snd_pcm *pcm = rtd->pcm;
139 int ret;
140
141 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
142 if (ret)
143 return ret;
144
145 return pxa2xx_pcm_preallocate_dma_buffer(pcm);
146 }
147 EXPORT_SYMBOL(pxa2xx_soc_pcm_new);
148
149 int pxa2xx_soc_pcm_open(struct snd_soc_component *component,
150 struct snd_pcm_substream *substream)
151 {
152 return pxa2xx_pcm_open(substream);
153 }
154 EXPORT_SYMBOL(pxa2xx_soc_pcm_open);
155
156 int pxa2xx_soc_pcm_close(struct snd_soc_component *component,
157 struct snd_pcm_substream *substream)
158 {
159 return pxa2xx_pcm_close(substream);
160 }
161 EXPORT_SYMBOL(pxa2xx_soc_pcm_close);
162
163 int pxa2xx_soc_pcm_hw_params(struct snd_soc_component *component,
164 struct snd_pcm_substream *substream,
165 struct snd_pcm_hw_params *params)
166 {
167 return pxa2xx_pcm_hw_params(substream, params);
168 }
169 EXPORT_SYMBOL(pxa2xx_soc_pcm_hw_params);
170
171 int pxa2xx_soc_pcm_prepare(struct snd_soc_component *component,
172 struct snd_pcm_substream *substream)
173 {
174 return pxa2xx_pcm_prepare(substream);
175 }
176 EXPORT_SYMBOL(pxa2xx_soc_pcm_prepare);
177
178 int pxa2xx_soc_pcm_trigger(struct snd_soc_component *component,
179 struct snd_pcm_substream *substream, int cmd)
180 {
181 return pxa2xx_pcm_trigger(substream, cmd);
182 }
183 EXPORT_SYMBOL(pxa2xx_soc_pcm_trigger);
184
185 snd_pcm_uframes_t
186 pxa2xx_soc_pcm_pointer(struct snd_soc_component *component,
187 struct snd_pcm_substream *substream)
188 {
189 return pxa2xx_pcm_pointer(substream);
190 }
191 EXPORT_SYMBOL(pxa2xx_soc_pcm_pointer);
192
193 MODULE_AUTHOR("Nicolas Pitre");
194 MODULE_DESCRIPTION("Intel PXA2xx sound library");
195 MODULE_LICENSE("GPL");
196
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.