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 
pxa2xx_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)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 = substream->private_data;
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(asoc_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(asoc_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 
pxa2xx_pcm_trigger(struct snd_pcm_substream * substream,int cmd)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
pxa2xx_pcm_pointer(struct snd_pcm_substream * substream)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 
pxa2xx_pcm_prepare(struct snd_pcm_substream * substream)74 int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
75 {
76 	return 0;
77 }
78 EXPORT_SYMBOL(pxa2xx_pcm_prepare);
79 
pxa2xx_pcm_open(struct snd_pcm_substream * substream)80 int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
81 {
82 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
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(asoc_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(asoc_rtd_to_cpu(rtd, 0)->dev,
115 						     dma_params->chan_name));
116 }
117 EXPORT_SYMBOL(pxa2xx_pcm_open);
118 
pxa2xx_pcm_close(struct snd_pcm_substream * substream)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 
pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm * pcm)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 
pxa2xx_soc_pcm_new(struct snd_soc_component * component,struct snd_soc_pcm_runtime * rtd)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 
pxa2xx_soc_pcm_open(struct snd_soc_component * component,struct snd_pcm_substream * substream)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 
pxa2xx_soc_pcm_close(struct snd_soc_component * component,struct snd_pcm_substream * substream)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 
pxa2xx_soc_pcm_hw_params(struct snd_soc_component * component,struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)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 
pxa2xx_soc_pcm_prepare(struct snd_soc_component * component,struct snd_pcm_substream * substream)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 
pxa2xx_soc_pcm_trigger(struct snd_soc_component * component,struct snd_pcm_substream * substream,int cmd)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
pxa2xx_soc_pcm_pointer(struct snd_soc_component * component,struct snd_pcm_substream * substream)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