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Linux/sound/core/pcm_dmaengine.c

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  1 /*
  2  *  Copyright (C) 2012, Analog Devices Inc.
  3  *      Author: Lars-Peter Clausen <lars@metafoo.de>
  4  *
  5  *  Based on:
  6  *      imx-pcm-dma-mx2.c, Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
  7  *      mxs-pcm.c, Copyright (C) 2011 Freescale Semiconductor, Inc.
  8  *      ep93xx-pcm.c, Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
  9  *                    Copyright (C) 2006 Applied Data Systems
 10  *
 11  *  This program is free software; you can redistribute it and/or modify it
 12  *  under  the terms of the GNU General  Public License as published by the
 13  *  Free Software Foundation;  either version 2 of the License, or (at your
 14  *  option) any later version.
 15  *
 16  *  You should have received a copy of the GNU General Public License along
 17  *  with this program; if not, write to the Free Software Foundation, Inc.,
 18  *  675 Mass Ave, Cambridge, MA 02139, USA.
 19  *
 20  */
 21 #include <linux/module.h>
 22 #include <linux/init.h>
 23 #include <linux/dmaengine.h>
 24 #include <linux/slab.h>
 25 #include <sound/pcm.h>
 26 #include <sound/pcm_params.h>
 27 #include <sound/soc.h>
 28 
 29 #include <sound/dmaengine_pcm.h>
 30 
 31 struct dmaengine_pcm_runtime_data {
 32         struct dma_chan *dma_chan;
 33         dma_cookie_t cookie;
 34 
 35         unsigned int pos;
 36 };
 37 
 38 static inline struct dmaengine_pcm_runtime_data *substream_to_prtd(
 39         const struct snd_pcm_substream *substream)
 40 {
 41         return substream->runtime->private_data;
 42 }
 43 
 44 struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream)
 45 {
 46         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
 47 
 48         return prtd->dma_chan;
 49 }
 50 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_get_chan);
 51 
 52 /**
 53  * snd_hwparams_to_dma_slave_config - Convert hw_params to dma_slave_config
 54  * @substream: PCM substream
 55  * @params: hw_params
 56  * @slave_config: DMA slave config
 57  *
 58  * This function can be used to initialize a dma_slave_config from a substream
 59  * and hw_params in a dmaengine based PCM driver implementation.
 60  */
 61 int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
 62         const struct snd_pcm_hw_params *params,
 63         struct dma_slave_config *slave_config)
 64 {
 65         enum dma_slave_buswidth buswidth;
 66         int bits;
 67 
 68         bits = params_physical_width(params);
 69         if (bits < 8 || bits > 64)
 70                 return -EINVAL;
 71         else if (bits == 8)
 72                 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
 73         else if (bits == 16)
 74                 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
 75         else if (bits == 24)
 76                 buswidth = DMA_SLAVE_BUSWIDTH_3_BYTES;
 77         else if (bits <= 32)
 78                 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
 79         else
 80                 buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES;
 81 
 82         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 83                 slave_config->direction = DMA_MEM_TO_DEV;
 84                 slave_config->dst_addr_width = buswidth;
 85         } else {
 86                 slave_config->direction = DMA_DEV_TO_MEM;
 87                 slave_config->src_addr_width = buswidth;
 88         }
 89 
 90         slave_config->device_fc = false;
 91 
 92         return 0;
 93 }
 94 EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config);
 95 
 96 /**
 97  * snd_dmaengine_pcm_set_config_from_dai_data() - Initializes a dma slave config
 98  *  using DAI DMA data.
 99  * @substream: PCM substream
100  * @dma_data: DAI DMA data
101  * @slave_config: DMA slave configuration
102  *
103  * Initializes the {dst,src}_addr, {dst,src}_maxburst, {dst,src}_addr_width and
104  * slave_id fields of the DMA slave config from the same fields of the DAI DMA
105  * data struct. The src and dst fields will be initialized depending on the
106  * direction of the substream. If the substream is a playback stream the dst
107  * fields will be initialized, if it is a capture stream the src fields will be
108  * initialized. The {dst,src}_addr_width field will only be initialized if the
109  * addr_width field of the DAI DMA data struct is not equal to
110  * DMA_SLAVE_BUSWIDTH_UNDEFINED.
111  */
112 void snd_dmaengine_pcm_set_config_from_dai_data(
113         const struct snd_pcm_substream *substream,
114         const struct snd_dmaengine_dai_dma_data *dma_data,
115         struct dma_slave_config *slave_config)
116 {
117         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
118                 slave_config->dst_addr = dma_data->addr;
119                 slave_config->dst_maxburst = dma_data->maxburst;
120                 if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED)
121                         slave_config->dst_addr_width = dma_data->addr_width;
122         } else {
123                 slave_config->src_addr = dma_data->addr;
124                 slave_config->src_maxburst = dma_data->maxburst;
125                 if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED)
126                         slave_config->src_addr_width = dma_data->addr_width;
127         }
128 
129         slave_config->slave_id = dma_data->slave_id;
130 }
131 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_set_config_from_dai_data);
132 
133 static void dmaengine_pcm_dma_complete(void *arg)
134 {
135         struct snd_pcm_substream *substream = arg;
136         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
137 
138         prtd->pos += snd_pcm_lib_period_bytes(substream);
139         if (prtd->pos >= snd_pcm_lib_buffer_bytes(substream))
140                 prtd->pos = 0;
141 
142         snd_pcm_period_elapsed(substream);
143 }
144 
145 static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream)
146 {
147         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
148         struct dma_chan *chan = prtd->dma_chan;
149         struct dma_async_tx_descriptor *desc;
150         enum dma_transfer_direction direction;
151         unsigned long flags = DMA_CTRL_ACK;
152 
153         direction = snd_pcm_substream_to_dma_direction(substream);
154 
155         if (!substream->runtime->no_period_wakeup)
156                 flags |= DMA_PREP_INTERRUPT;
157 
158         prtd->pos = 0;
159         desc = dmaengine_prep_dma_cyclic(chan,
160                 substream->runtime->dma_addr,
161                 snd_pcm_lib_buffer_bytes(substream),
162                 snd_pcm_lib_period_bytes(substream), direction, flags);
163 
164         if (!desc)
165                 return -ENOMEM;
166 
167         desc->callback = dmaengine_pcm_dma_complete;
168         desc->callback_param = substream;
169         prtd->cookie = dmaengine_submit(desc);
170 
171         return 0;
172 }
173 
174 /**
175  * snd_dmaengine_pcm_trigger - dmaengine based PCM trigger implementation
176  * @substream: PCM substream
177  * @cmd: Trigger command
178  *
179  * Returns 0 on success, a negative error code otherwise.
180  *
181  * This function can be used as the PCM trigger callback for dmaengine based PCM
182  * driver implementations.
183  */
184 int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
185 {
186         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
187         struct snd_pcm_runtime *runtime = substream->runtime;
188         int ret;
189 
190         switch (cmd) {
191         case SNDRV_PCM_TRIGGER_START:
192                 ret = dmaengine_pcm_prepare_and_submit(substream);
193                 if (ret)
194                         return ret;
195                 dma_async_issue_pending(prtd->dma_chan);
196                 break;
197         case SNDRV_PCM_TRIGGER_RESUME:
198         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
199                 dmaengine_resume(prtd->dma_chan);
200                 break;
201         case SNDRV_PCM_TRIGGER_SUSPEND:
202                 if (runtime->info & SNDRV_PCM_INFO_PAUSE)
203                         dmaengine_pause(prtd->dma_chan);
204                 else
205                         dmaengine_terminate_all(prtd->dma_chan);
206                 break;
207         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
208                 dmaengine_pause(prtd->dma_chan);
209                 break;
210         case SNDRV_PCM_TRIGGER_STOP:
211                 dmaengine_terminate_all(prtd->dma_chan);
212                 break;
213         default:
214                 return -EINVAL;
215         }
216 
217         return 0;
218 }
219 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_trigger);
220 
221 /**
222  * snd_dmaengine_pcm_pointer_no_residue - dmaengine based PCM pointer implementation
223  * @substream: PCM substream
224  *
225  * This function is deprecated and should not be used by new drivers, as its
226  * results may be unreliable.
227  */
228 snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream)
229 {
230         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
231         return bytes_to_frames(substream->runtime, prtd->pos);
232 }
233 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer_no_residue);
234 
235 /**
236  * snd_dmaengine_pcm_pointer - dmaengine based PCM pointer implementation
237  * @substream: PCM substream
238  *
239  * This function can be used as the PCM pointer callback for dmaengine based PCM
240  * driver implementations.
241  */
242 snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream)
243 {
244         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
245         struct dma_tx_state state;
246         enum dma_status status;
247         unsigned int buf_size;
248         unsigned int pos = 0;
249 
250         status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state);
251         if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) {
252                 buf_size = snd_pcm_lib_buffer_bytes(substream);
253                 if (state.residue > 0 && state.residue <= buf_size)
254                         pos = buf_size - state.residue;
255         }
256 
257         return bytes_to_frames(substream->runtime, pos);
258 }
259 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer);
260 
261 /**
262  * snd_dmaengine_pcm_request_channel - Request channel for the dmaengine PCM
263  * @filter_fn: Filter function used to request the DMA channel
264  * @filter_data: Data passed to the DMA filter function
265  *
266  * Returns NULL or the requested DMA channel.
267  *
268  * This function request a DMA channel for usage with dmaengine PCM.
269  */
270 struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
271         void *filter_data)
272 {
273         dma_cap_mask_t mask;
274 
275         dma_cap_zero(mask);
276         dma_cap_set(DMA_SLAVE, mask);
277         dma_cap_set(DMA_CYCLIC, mask);
278 
279         return dma_request_channel(mask, filter_fn, filter_data);
280 }
281 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel);
282 
283 /**
284  * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
285  * @substream: PCM substream
286  * @chan: DMA channel to use for data transfers
287  *
288  * Returns 0 on success, a negative error code otherwise.
289  *
290  * The function should usually be called from the pcm open callback. Note that
291  * this function will use private_data field of the substream's runtime. So it
292  * is not available to your pcm driver implementation.
293  */
294 int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
295         struct dma_chan *chan)
296 {
297         struct dmaengine_pcm_runtime_data *prtd;
298         int ret;
299 
300         if (!chan)
301                 return -ENXIO;
302 
303         ret = snd_pcm_hw_constraint_integer(substream->runtime,
304                                             SNDRV_PCM_HW_PARAM_PERIODS);
305         if (ret < 0)
306                 return ret;
307 
308         prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
309         if (!prtd)
310                 return -ENOMEM;
311 
312         prtd->dma_chan = chan;
313 
314         substream->runtime->private_data = prtd;
315 
316         return 0;
317 }
318 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open);
319 
320 /**
321  * snd_dmaengine_pcm_open_request_chan - Open a dmaengine based PCM substream and request channel
322  * @substream: PCM substream
323  * @filter_fn: Filter function used to request the DMA channel
324  * @filter_data: Data passed to the DMA filter function
325  *
326  * Returns 0 on success, a negative error code otherwise.
327  *
328  * This function will request a DMA channel using the passed filter function and
329  * data. The function should usually be called from the pcm open callback. Note
330  * that this function will use private_data field of the substream's runtime. So
331  * it is not available to your pcm driver implementation.
332  */
333 int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
334         dma_filter_fn filter_fn, void *filter_data)
335 {
336         return snd_dmaengine_pcm_open(substream,
337                     snd_dmaengine_pcm_request_channel(filter_fn, filter_data));
338 }
339 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan);
340 
341 /**
342  * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
343  * @substream: PCM substream
344  */
345 int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
346 {
347         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
348 
349         kfree(prtd);
350 
351         return 0;
352 }
353 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close);
354 
355 /**
356  * snd_dmaengine_pcm_release_chan_close - Close a dmaengine based PCM substream and release channel
357  * @substream: PCM substream
358  *
359  * Releases the DMA channel associated with the PCM substream.
360  */
361 int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream)
362 {
363         struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
364 
365         dma_release_channel(prtd->dma_chan);
366 
367         return snd_dmaengine_pcm_close(substream);
368 }
369 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close_release_chan);
370 
371 MODULE_LICENSE("GPL");
372 

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