xref: /openbmc/linux/sound/arm/pxa2xx-pcm-lib.c (revision 9b9c2cd4)
1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License version 2 as
4  * published by the Free Software Foundation.
5  */
6 
7 #include <linux/slab.h>
8 #include <linux/module.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/dmaengine.h>
11 #include <linux/dma/pxa-dma.h>
12 
13 #include <sound/core.h>
14 #include <sound/pcm.h>
15 #include <sound/pcm_params.h>
16 #include <sound/pxa2xx-lib.h>
17 #include <sound/dmaengine_pcm.h>
18 
19 #include "pxa2xx-pcm.h"
20 
21 static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
22 	.info			= SNDRV_PCM_INFO_MMAP |
23 				  SNDRV_PCM_INFO_MMAP_VALID |
24 				  SNDRV_PCM_INFO_INTERLEAVED |
25 				  SNDRV_PCM_INFO_PAUSE |
26 				  SNDRV_PCM_INFO_RESUME,
27 	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
28 					SNDRV_PCM_FMTBIT_S24_LE |
29 					SNDRV_PCM_FMTBIT_S32_LE,
30 	.period_bytes_min	= 32,
31 	.period_bytes_max	= 8192 - 32,
32 	.periods_min		= 1,
33 	.periods_max		= 256,
34 	.buffer_bytes_max	= 128 * 1024,
35 	.fifo_size		= 32,
36 };
37 
38 int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
39 				struct snd_pcm_hw_params *params)
40 {
41 	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
42 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
43 	struct snd_dmaengine_dai_dma_data *dma_params;
44 	struct dma_slave_config config;
45 	int ret;
46 
47 	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
48 	if (!dma_params)
49 		return 0;
50 
51 	ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
52 	if (ret)
53 		return ret;
54 
55 	snd_dmaengine_pcm_set_config_from_dai_data(substream,
56 			snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
57 			&config);
58 
59 	ret = dmaengine_slave_config(chan, &config);
60 	if (ret)
61 		return ret;
62 
63 	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
64 
65 	return 0;
66 }
67 EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
68 
69 int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
70 {
71 	snd_pcm_set_runtime_buffer(substream, NULL);
72 	return 0;
73 }
74 EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
75 
76 int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
77 {
78 	return snd_dmaengine_pcm_trigger(substream, cmd);
79 }
80 EXPORT_SYMBOL(pxa2xx_pcm_trigger);
81 
82 snd_pcm_uframes_t
83 pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
84 {
85 	return snd_dmaengine_pcm_pointer(substream);
86 }
87 EXPORT_SYMBOL(pxa2xx_pcm_pointer);
88 
89 int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
90 {
91 	return 0;
92 }
93 EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
94 
95 int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
96 {
97 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
98 	struct snd_pcm_runtime *runtime = substream->runtime;
99 	struct snd_dmaengine_dai_dma_data *dma_params;
100 	int ret;
101 
102 	runtime->hw = pxa2xx_pcm_hardware;
103 
104 	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
105 	if (!dma_params)
106 		return 0;
107 
108 	/*
109 	 * For mysterious reasons (and despite what the manual says)
110 	 * playback samples are lost if the DMA count is not a multiple
111 	 * of the DMA burst size.  Let's add a rule to enforce that.
112 	 */
113 	ret = snd_pcm_hw_constraint_step(runtime, 0,
114 		SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
115 	if (ret)
116 		return ret;
117 
118 	ret = snd_pcm_hw_constraint_step(runtime, 0,
119 		SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
120 	if (ret)
121 		return ret;
122 
123 	ret = snd_pcm_hw_constraint_integer(runtime,
124 					    SNDRV_PCM_HW_PARAM_PERIODS);
125 	if (ret < 0)
126 		return ret;
127 
128 	return snd_dmaengine_pcm_open_request_chan(substream,
129 					pxad_filter_fn,
130 					dma_params->filter_data);
131 }
132 EXPORT_SYMBOL(__pxa2xx_pcm_open);
133 
134 int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
135 {
136 	return snd_dmaengine_pcm_close_release_chan(substream);
137 }
138 EXPORT_SYMBOL(__pxa2xx_pcm_close);
139 
140 int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
141 	struct vm_area_struct *vma)
142 {
143 	struct snd_pcm_runtime *runtime = substream->runtime;
144 	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
145 				     runtime->dma_area,
146 				     runtime->dma_addr,
147 				     runtime->dma_bytes);
148 }
149 EXPORT_SYMBOL(pxa2xx_pcm_mmap);
150 
151 int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
152 {
153 	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
154 	struct snd_dma_buffer *buf = &substream->dma_buffer;
155 	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
156 	buf->dev.type = SNDRV_DMA_TYPE_DEV;
157 	buf->dev.dev = pcm->card->dev;
158 	buf->private_data = NULL;
159 	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
160 					   &buf->addr, GFP_KERNEL);
161 	if (!buf->area)
162 		return -ENOMEM;
163 	buf->bytes = size;
164 	return 0;
165 }
166 EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
167 
168 void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
169 {
170 	struct snd_pcm_substream *substream;
171 	struct snd_dma_buffer *buf;
172 	int stream;
173 
174 	for (stream = 0; stream < 2; stream++) {
175 		substream = pcm->streams[stream].substream;
176 		if (!substream)
177 			continue;
178 		buf = &substream->dma_buffer;
179 		if (!buf->area)
180 			continue;
181 		dma_free_writecombine(pcm->card->dev, buf->bytes,
182 				      buf->area, buf->addr);
183 		buf->area = NULL;
184 	}
185 }
186 EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
187 
188 MODULE_AUTHOR("Nicolas Pitre");
189 MODULE_DESCRIPTION("Intel PXA2xx sound library");
190 MODULE_LICENSE("GPL");
191