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Linux/sound/soc/pxa/mmp-pcm.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * linux/sound/soc/pxa/mmp-pcm.c
  4  *
  5  * Copyright (C) 2011 Marvell International Ltd.
  6  */
  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>
 15 
 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>
 22 
 23 #define DRV_NAME "mmp-pcm"
 24 
 25 struct mmp_dma_data {
 26         int ssp_id;
 27         struct resource *dma_res;
 28 };
 29 
 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)
 36 
 37 static struct snd_pcm_hardware mmp_pcm_hardware[] = {
 38         {
 39                 .info                   = MMP_PCM_INFO,
 40                 .period_bytes_min       = 1024,
 41                 .period_bytes_max       = 2048,
 42                 .periods_min            = 2,
 43                 .periods_max            = 32,
 44                 .buffer_bytes_max       = 4096,
 45                 .fifo_size              = 32,
 46         },
 47         {
 48                 .info                   = MMP_PCM_INFO,
 49                 .period_bytes_min       = 1024,
 50                 .period_bytes_max       = 2048,
 51                 .periods_min            = 2,
 52                 .periods_max            = 32,
 53                 .buffer_bytes_max       = 4096,
 54                 .fifo_size              = 32,
 55         },
 56 };
 57 
 58 static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
 59                               struct snd_pcm_hw_params *params)
 60 {
 61         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
 62         struct dma_slave_config slave_config;
 63         int ret;
 64 
 65         ret =
 66             snd_dmaengine_pcm_prepare_slave_config(substream, params,
 67                                                    &slave_config);
 68         if (ret)
 69                 return ret;
 70 
 71         ret = dmaengine_slave_config(chan, &slave_config);
 72         if (ret)
 73                 return ret;
 74 
 75         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 76 
 77         return 0;
 78 }
 79 
 80 static bool filter(struct dma_chan *chan, void *param)
 81 {
 82         struct mmp_dma_data *dma_data = param;
 83         bool found = false;
 84         char *devname;
 85 
 86         devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
 87                 dma_data->ssp_id);
 88         if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
 89                 (chan->chan_id == dma_data->dma_res->start)) {
 90                 found = true;
 91         }
 92 
 93         kfree(devname);
 94         return found;
 95 }
 96 
 97 static int mmp_pcm_open(struct snd_pcm_substream *substream)
 98 {
 99         struct snd_soc_pcm_runtime *rtd = substream->private_data;
100         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
101         struct platform_device *pdev = to_platform_device(component->dev);
102         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
103         struct mmp_dma_data dma_data;
104         struct resource *r;
105 
106         r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
107         if (!r)
108                 return -EBUSY;
109 
110         snd_soc_set_runtime_hwparams(substream,
111                                 &mmp_pcm_hardware[substream->stream]);
112 
113         dma_data.dma_res = r;
114         dma_data.ssp_id = cpu_dai->id;
115 
116         return snd_dmaengine_pcm_open_request_chan(substream, filter,
117                     &dma_data);
118 }
119 
120 static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
121                          struct vm_area_struct *vma)
122 {
123         struct snd_pcm_runtime *runtime = substream->runtime;
124         unsigned long off = vma->vm_pgoff;
125 
126         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
127         return remap_pfn_range(vma, vma->vm_start,
128                 __phys_to_pfn(runtime->dma_addr) + off,
129                 vma->vm_end - vma->vm_start, vma->vm_page_prot);
130 }
131 
132 static const struct snd_pcm_ops mmp_pcm_ops = {
133         .open           = mmp_pcm_open,
134         .close          = snd_dmaengine_pcm_close_release_chan,
135         .ioctl          = snd_pcm_lib_ioctl,
136         .hw_params      = mmp_pcm_hw_params,
137         .trigger        = snd_dmaengine_pcm_trigger,
138         .pointer        = snd_dmaengine_pcm_pointer,
139         .mmap           = mmp_pcm_mmap,
140 };
141 
142 static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
143 {
144         struct snd_pcm_substream *substream;
145         struct snd_dma_buffer *buf;
146         int stream;
147         struct gen_pool *gpool;
148 
149         gpool = sram_get_gpool("asram");
150         if (!gpool)
151                 return;
152 
153         for (stream = 0; stream < 2; stream++) {
154                 size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
155 
156                 substream = pcm->streams[stream].substream;
157                 if (!substream)
158                         continue;
159 
160                 buf = &substream->dma_buffer;
161                 if (!buf->area)
162                         continue;
163                 gen_pool_free(gpool, (unsigned long)buf->area, size);
164                 buf->area = NULL;
165         }
166 
167 }
168 
169 static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
170                                                                 int stream)
171 {
172         struct snd_dma_buffer *buf = &substream->dma_buffer;
173         size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
174         struct gen_pool *gpool;
175 
176         buf->dev.type = SNDRV_DMA_TYPE_DEV;
177         buf->dev.dev = substream->pcm->card->dev;
178         buf->private_data = NULL;
179 
180         gpool = sram_get_gpool("asram");
181         if (!gpool)
182                 return -ENOMEM;
183 
184         buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
185         if (!buf->area)
186                 return -ENOMEM;
187         buf->bytes = size;
188         return 0;
189 }
190 
191 static int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
192 {
193         struct snd_pcm_substream *substream;
194         struct snd_pcm *pcm = rtd->pcm;
195         int ret = 0, stream;
196 
197         for (stream = 0; stream < 2; stream++) {
198                 substream = pcm->streams[stream].substream;
199 
200                 ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
201                 if (ret)
202                         goto err;
203         }
204 
205         return 0;
206 
207 err:
208         mmp_pcm_free_dma_buffers(pcm);
209         return ret;
210 }
211 
212 static const struct snd_soc_component_driver mmp_soc_component = {
213         .name           = DRV_NAME,
214         .ops            = &mmp_pcm_ops,
215         .pcm_new        = mmp_pcm_new,
216         .pcm_free       = mmp_pcm_free_dma_buffers,
217 };
218 
219 static int mmp_pcm_probe(struct platform_device *pdev)
220 {
221         struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
222 
223         if (pdata) {
224                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
225                                                 pdata->buffer_max_playback;
226                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
227                                                 pdata->period_max_playback;
228                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
229                                                 pdata->buffer_max_capture;
230                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
231                                                 pdata->period_max_capture;
232         }
233         return devm_snd_soc_register_component(&pdev->dev, &mmp_soc_component,
234                                                NULL, 0);
235 }
236 
237 static struct platform_driver mmp_pcm_driver = {
238         .driver = {
239                 .name = "mmp-pcm-audio",
240         },
241 
242         .probe = mmp_pcm_probe,
243 };
244 
245 module_platform_driver(mmp_pcm_driver);
246 
247 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
248 MODULE_DESCRIPTION("MMP Soc Audio DMA module");
249 MODULE_LICENSE("GPL");
250 MODULE_ALIAS("platform:mmp-pcm-audio");
251 

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