1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * linux/sound/soc/pxa/mmp-pcm.c
5 * Copyright (C) 2011 Marvell International Ltd.
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/platform_device.h>
10 #include <linux/slab.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/dmaengine.h>
13 #include <linux/platform_data/dma-mmp_tdma.h>
14 #include <linux/platform_data/mmp_audio.h>
16 #include <sound/pxa2xx-lib.h>
17 #include <sound/core.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
21 #include <sound/dmaengine_pcm.h>
23 #define DRV_NAME "mmp-pcm"
27 struct resource
*dma_res
;
30 #define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP | \
31 SNDRV_PCM_INFO_MMAP_VALID | \
32 SNDRV_PCM_INFO_INTERLEAVED | \
33 SNDRV_PCM_INFO_PAUSE | \
34 SNDRV_PCM_INFO_RESUME | \
35 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
37 static struct snd_pcm_hardware mmp_pcm_hardware
[] = {
40 .period_bytes_min
= 1024,
41 .period_bytes_max
= 2048,
44 .buffer_bytes_max
= 4096,
49 .period_bytes_min
= 1024,
50 .period_bytes_max
= 2048,
53 .buffer_bytes_max
= 4096,
58 static int mmp_pcm_hw_params(struct snd_soc_component
*component
,
59 struct snd_pcm_substream
*substream
,
60 struct snd_pcm_hw_params
*params
)
62 struct dma_chan
*chan
= snd_dmaengine_pcm_get_chan(substream
);
63 struct dma_slave_config slave_config
;
67 snd_dmaengine_pcm_prepare_slave_config(substream
, params
,
72 ret
= dmaengine_slave_config(chan
, &slave_config
);
76 snd_pcm_set_runtime_buffer(substream
, &substream
->dma_buffer
);
81 static int mmp_pcm_trigger(struct snd_soc_component
*component
,
82 struct snd_pcm_substream
*substream
, int cmd
)
84 return snd_dmaengine_pcm_trigger(substream
, cmd
);
87 static snd_pcm_uframes_t
mmp_pcm_pointer(struct snd_soc_component
*component
,
88 struct snd_pcm_substream
*substream
)
90 return snd_dmaengine_pcm_pointer(substream
);
93 static bool filter(struct dma_chan
*chan
, void *param
)
95 struct mmp_dma_data
*dma_data
= param
;
99 devname
= kasprintf(GFP_KERNEL
, "%s.%d", dma_data
->dma_res
->name
,
101 if ((strcmp(dev_name(chan
->device
->dev
), devname
) == 0) &&
102 (chan
->chan_id
== dma_data
->dma_res
->start
)) {
110 static int mmp_pcm_open(struct snd_soc_component
*component
,
111 struct snd_pcm_substream
*substream
)
113 struct snd_soc_pcm_runtime
*rtd
= asoc_substream_to_rtd(substream
);
114 struct platform_device
*pdev
= to_platform_device(component
->dev
);
115 struct snd_soc_dai
*cpu_dai
= asoc_rtd_to_cpu(rtd
, 0);
116 struct mmp_dma_data dma_data
;
119 r
= platform_get_resource(pdev
, IORESOURCE_DMA
, substream
->stream
);
123 snd_soc_set_runtime_hwparams(substream
,
124 &mmp_pcm_hardware
[substream
->stream
]);
126 dma_data
.dma_res
= r
;
127 dma_data
.ssp_id
= cpu_dai
->id
;
129 return snd_dmaengine_pcm_open_request_chan(substream
, filter
,
133 static int mmp_pcm_close(struct snd_soc_component
*component
,
134 struct snd_pcm_substream
*substream
)
136 return snd_dmaengine_pcm_close_release_chan(substream
);
139 static int mmp_pcm_mmap(struct snd_soc_component
*component
,
140 struct snd_pcm_substream
*substream
,
141 struct vm_area_struct
*vma
)
143 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
144 unsigned long off
= vma
->vm_pgoff
;
146 vma
->vm_page_prot
= pgprot_noncached(vma
->vm_page_prot
);
147 return remap_pfn_range(vma
, vma
->vm_start
,
148 __phys_to_pfn(runtime
->dma_addr
) + off
,
149 vma
->vm_end
- vma
->vm_start
, vma
->vm_page_prot
);
152 static void mmp_pcm_free_dma_buffers(struct snd_soc_component
*component
,
155 struct snd_pcm_substream
*substream
;
156 struct snd_dma_buffer
*buf
;
158 struct gen_pool
*gpool
;
160 gpool
= sram_get_gpool("asram");
164 for (stream
= 0; stream
< 2; stream
++) {
165 size_t size
= mmp_pcm_hardware
[stream
].buffer_bytes_max
;
167 substream
= pcm
->streams
[stream
].substream
;
171 buf
= &substream
->dma_buffer
;
174 gen_pool_free(gpool
, (unsigned long)buf
->area
, size
);
180 static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream
*substream
,
183 struct snd_dma_buffer
*buf
= &substream
->dma_buffer
;
184 size_t size
= mmp_pcm_hardware
[stream
].buffer_bytes_max
;
185 struct gen_pool
*gpool
;
187 buf
->dev
.type
= SNDRV_DMA_TYPE_DEV
;
188 buf
->dev
.dev
= substream
->pcm
->card
->dev
;
189 buf
->private_data
= NULL
;
191 gpool
= sram_get_gpool("asram");
195 buf
->area
= gen_pool_dma_alloc(gpool
, size
, &buf
->addr
);
202 static int mmp_pcm_new(struct snd_soc_component
*component
,
203 struct snd_soc_pcm_runtime
*rtd
)
205 struct snd_pcm_substream
*substream
;
206 struct snd_pcm
*pcm
= rtd
->pcm
;
209 for (stream
= 0; stream
< 2; stream
++) {
210 substream
= pcm
->streams
[stream
].substream
;
212 ret
= mmp_pcm_preallocate_dma_buffer(substream
, stream
);
220 mmp_pcm_free_dma_buffers(component
, pcm
);
224 static const struct snd_soc_component_driver mmp_soc_component
= {
226 .open
= mmp_pcm_open
,
227 .close
= mmp_pcm_close
,
228 .hw_params
= mmp_pcm_hw_params
,
229 .trigger
= mmp_pcm_trigger
,
230 .pointer
= mmp_pcm_pointer
,
231 .mmap
= mmp_pcm_mmap
,
232 .pcm_construct
= mmp_pcm_new
,
233 .pcm_destruct
= mmp_pcm_free_dma_buffers
,
236 static int mmp_pcm_probe(struct platform_device
*pdev
)
238 struct mmp_audio_platdata
*pdata
= pdev
->dev
.platform_data
;
241 mmp_pcm_hardware
[SNDRV_PCM_STREAM_PLAYBACK
].buffer_bytes_max
=
242 pdata
->buffer_max_playback
;
243 mmp_pcm_hardware
[SNDRV_PCM_STREAM_PLAYBACK
].period_bytes_max
=
244 pdata
->period_max_playback
;
245 mmp_pcm_hardware
[SNDRV_PCM_STREAM_CAPTURE
].buffer_bytes_max
=
246 pdata
->buffer_max_capture
;
247 mmp_pcm_hardware
[SNDRV_PCM_STREAM_CAPTURE
].period_bytes_max
=
248 pdata
->period_max_capture
;
250 return devm_snd_soc_register_component(&pdev
->dev
, &mmp_soc_component
,
254 static struct platform_driver mmp_pcm_driver
= {
256 .name
= "mmp-pcm-audio",
259 .probe
= mmp_pcm_probe
,
262 module_platform_driver(mmp_pcm_driver
);
264 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
265 MODULE_DESCRIPTION("MMP Soc Audio DMA module");
266 MODULE_LICENSE("GPL");
267 MODULE_ALIAS("platform:mmp-pcm-audio");