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

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  1 /*
  2  * linux/sound/soc/pxa/mmp-pcm.c
  3  *
  4  * Copyright (C) 2011 Marvell International Ltd.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  */
 12 #include <linux/module.h>
 13 #include <linux/init.h>
 14 #include <linux/platform_device.h>
 15 #include <linux/slab.h>
 16 #include <linux/dma-mapping.h>
 17 #include <linux/dmaengine.h>
 18 #include <linux/platform_data/dma-mmp_tdma.h>
 19 #include <linux/platform_data/mmp_audio.h>
 20 
 21 #include <sound/pxa2xx-lib.h>
 22 #include <sound/core.h>
 23 #include <sound/pcm.h>
 24 #include <sound/pcm_params.h>
 25 #include <sound/soc.h>
 26 #include <sound/dmaengine_pcm.h>
 27 
 28 struct mmp_dma_data {
 29         int ssp_id;
 30         struct resource *dma_res;
 31 };
 32 
 33 #define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP |     \
 34                 SNDRV_PCM_INFO_MMAP_VALID |     \
 35                 SNDRV_PCM_INFO_INTERLEAVED |    \
 36                 SNDRV_PCM_INFO_PAUSE |          \
 37                 SNDRV_PCM_INFO_RESUME |         \
 38                 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
 39 
 40 static struct snd_pcm_hardware mmp_pcm_hardware[] = {
 41         {
 42                 .info                   = MMP_PCM_INFO,
 43                 .period_bytes_min       = 1024,
 44                 .period_bytes_max       = 2048,
 45                 .periods_min            = 2,
 46                 .periods_max            = 32,
 47                 .buffer_bytes_max       = 4096,
 48                 .fifo_size              = 32,
 49         },
 50         {
 51                 .info                   = MMP_PCM_INFO,
 52                 .period_bytes_min       = 1024,
 53                 .period_bytes_max       = 2048,
 54                 .periods_min            = 2,
 55                 .periods_max            = 32,
 56                 .buffer_bytes_max       = 4096,
 57                 .fifo_size              = 32,
 58         },
 59 };
 60 
 61 static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
 62                               struct snd_pcm_hw_params *params)
 63 {
 64         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
 65         struct dma_slave_config slave_config;
 66         int ret;
 67 
 68         ret =
 69             snd_dmaengine_pcm_prepare_slave_config(substream, params,
 70                                                    &slave_config);
 71         if (ret)
 72                 return ret;
 73 
 74         ret = dmaengine_slave_config(chan, &slave_config);
 75         if (ret)
 76                 return ret;
 77 
 78         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 79 
 80         return 0;
 81 }
 82 
 83 static bool filter(struct dma_chan *chan, void *param)
 84 {
 85         struct mmp_dma_data *dma_data = param;
 86         bool found = false;
 87         char *devname;
 88 
 89         devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
 90                 dma_data->ssp_id);
 91         if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
 92                 (chan->chan_id == dma_data->dma_res->start)) {
 93                 found = true;
 94         }
 95 
 96         kfree(devname);
 97         return found;
 98 }
 99 
100 static int mmp_pcm_open(struct snd_pcm_substream *substream)
101 {
102         struct snd_soc_pcm_runtime *rtd = substream->private_data;
103         struct platform_device *pdev = to_platform_device(rtd->platform->dev);
104         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
105         struct mmp_dma_data dma_data;
106         struct resource *r;
107 
108         r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
109         if (!r)
110                 return -EBUSY;
111 
112         snd_soc_set_runtime_hwparams(substream,
113                                 &mmp_pcm_hardware[substream->stream]);
114 
115         dma_data.dma_res = r;
116         dma_data.ssp_id = cpu_dai->id;
117 
118         return snd_dmaengine_pcm_open_request_chan(substream, filter,
119                     &dma_data);
120 }
121 
122 static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
123                          struct vm_area_struct *vma)
124 {
125         struct snd_pcm_runtime *runtime = substream->runtime;
126         unsigned long off = vma->vm_pgoff;
127 
128         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
129         return remap_pfn_range(vma, vma->vm_start,
130                 __phys_to_pfn(runtime->dma_addr) + off,
131                 vma->vm_end - vma->vm_start, vma->vm_page_prot);
132 }
133 
134 static const struct snd_pcm_ops mmp_pcm_ops = {
135         .open           = mmp_pcm_open,
136         .close          = snd_dmaengine_pcm_close_release_chan,
137         .ioctl          = snd_pcm_lib_ioctl,
138         .hw_params      = mmp_pcm_hw_params,
139         .trigger        = snd_dmaengine_pcm_trigger,
140         .pointer        = snd_dmaengine_pcm_pointer,
141         .mmap           = mmp_pcm_mmap,
142 };
143 
144 static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
145 {
146         struct snd_pcm_substream *substream;
147         struct snd_dma_buffer *buf;
148         int stream;
149         struct gen_pool *gpool;
150 
151         gpool = sram_get_gpool("asram");
152         if (!gpool)
153                 return;
154 
155         for (stream = 0; stream < 2; stream++) {
156                 size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
157 
158                 substream = pcm->streams[stream].substream;
159                 if (!substream)
160                         continue;
161 
162                 buf = &substream->dma_buffer;
163                 if (!buf->area)
164                         continue;
165                 gen_pool_free(gpool, (unsigned long)buf->area, size);
166                 buf->area = NULL;
167         }
168 
169 }
170 
171 static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
172                                                                 int stream)
173 {
174         struct snd_dma_buffer *buf = &substream->dma_buffer;
175         size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
176         struct gen_pool *gpool;
177 
178         buf->dev.type = SNDRV_DMA_TYPE_DEV;
179         buf->dev.dev = substream->pcm->card->dev;
180         buf->private_data = NULL;
181 
182         gpool = sram_get_gpool("asram");
183         if (!gpool)
184                 return -ENOMEM;
185 
186         buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
187         if (!buf->area)
188                 return -ENOMEM;
189         buf->bytes = size;
190         return 0;
191 }
192 
193 static int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
194 {
195         struct snd_pcm_substream *substream;
196         struct snd_pcm *pcm = rtd->pcm;
197         int ret = 0, stream;
198 
199         for (stream = 0; stream < 2; stream++) {
200                 substream = pcm->streams[stream].substream;
201 
202                 ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
203                 if (ret)
204                         goto err;
205         }
206 
207         return 0;
208 
209 err:
210         mmp_pcm_free_dma_buffers(pcm);
211         return ret;
212 }
213 
214 static const struct snd_soc_platform_driver mmp_soc_platform = {
215         .ops            = &mmp_pcm_ops,
216         .pcm_new        = mmp_pcm_new,
217         .pcm_free       = mmp_pcm_free_dma_buffers,
218 };
219 
220 static int mmp_pcm_probe(struct platform_device *pdev)
221 {
222         struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
223 
224         if (pdata) {
225                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
226                                                 pdata->buffer_max_playback;
227                 mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
228                                                 pdata->period_max_playback;
229                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
230                                                 pdata->buffer_max_capture;
231                 mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
232                                                 pdata->period_max_capture;
233         }
234         return devm_snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
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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