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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
31struct dmaengine_pcm_runtime_data {
32 struct dma_chan *dma_chan;
33 dma_cookie_t cookie;
34
35 unsigned int pos;
36};
37
38static 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
44struct 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}
50EXPORT_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 */
61int 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}
94EXPORT_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 * SND_DMAENGINE_PCM_DAI_FLAG_PACK flag is set or if the addr_width field of
110 * the DAI DMA data struct is not equal to DMA_SLAVE_BUSWIDTH_UNDEFINED. If
111 * both conditions are met the latter takes priority.
112 */
113void snd_dmaengine_pcm_set_config_from_dai_data(
114 const struct snd_pcm_substream *substream,
115 const struct snd_dmaengine_dai_dma_data *dma_data,
116 struct dma_slave_config *slave_config)
117{
118 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
119 slave_config->dst_addr = dma_data->addr;
120 slave_config->dst_maxburst = dma_data->maxburst;
121 if (dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK)
122 slave_config->dst_addr_width =
123 DMA_SLAVE_BUSWIDTH_UNDEFINED;
124 if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED)
125 slave_config->dst_addr_width = dma_data->addr_width;
126 } else {
127 slave_config->src_addr = dma_data->addr;
128 slave_config->src_maxburst = dma_data->maxburst;
129 if (dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK)
130 slave_config->src_addr_width =
131 DMA_SLAVE_BUSWIDTH_UNDEFINED;
132 if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED)
133 slave_config->src_addr_width = dma_data->addr_width;
134 }
135
136 slave_config->slave_id = dma_data->slave_id;
137}
138EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_set_config_from_dai_data);
139
140static void dmaengine_pcm_dma_complete(void *arg)
141{
142 struct snd_pcm_substream *substream = arg;
143 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
144
145 prtd->pos += snd_pcm_lib_period_bytes(substream);
146 if (prtd->pos >= snd_pcm_lib_buffer_bytes(substream))
147 prtd->pos = 0;
148
149 snd_pcm_period_elapsed(substream);
150}
151
152static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream)
153{
154 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
155 struct dma_chan *chan = prtd->dma_chan;
156 struct dma_async_tx_descriptor *desc;
157 enum dma_transfer_direction direction;
158 unsigned long flags = DMA_CTRL_ACK;
159
160 direction = snd_pcm_substream_to_dma_direction(substream);
161
162 if (!substream->runtime->no_period_wakeup)
163 flags |= DMA_PREP_INTERRUPT;
164
165 prtd->pos = 0;
166 desc = dmaengine_prep_dma_cyclic(chan,
167 substream->runtime->dma_addr,
168 snd_pcm_lib_buffer_bytes(substream),
169 snd_pcm_lib_period_bytes(substream), direction, flags);
170
171 if (!desc)
172 return -ENOMEM;
173
174 desc->callback = dmaengine_pcm_dma_complete;
175 desc->callback_param = substream;
176 prtd->cookie = dmaengine_submit(desc);
177
178 return 0;
179}
180
181/**
182 * snd_dmaengine_pcm_trigger - dmaengine based PCM trigger implementation
183 * @substream: PCM substream
184 * @cmd: Trigger command
185 *
186 * Returns 0 on success, a negative error code otherwise.
187 *
188 * This function can be used as the PCM trigger callback for dmaengine based PCM
189 * driver implementations.
190 */
191int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
192{
193 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
194 struct snd_pcm_runtime *runtime = substream->runtime;
195 int ret;
196
197 switch (cmd) {
198 case SNDRV_PCM_TRIGGER_START:
199 ret = dmaengine_pcm_prepare_and_submit(substream);
200 if (ret)
201 return ret;
202 dma_async_issue_pending(prtd->dma_chan);
203 break;
204 case SNDRV_PCM_TRIGGER_RESUME:
205 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
206 dmaengine_resume(prtd->dma_chan);
207 break;
208 case SNDRV_PCM_TRIGGER_SUSPEND:
209 if (runtime->info & SNDRV_PCM_INFO_PAUSE)
210 dmaengine_pause(prtd->dma_chan);
211 else
212 dmaengine_terminate_async(prtd->dma_chan);
213 break;
214 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
215 dmaengine_pause(prtd->dma_chan);
216 break;
217 case SNDRV_PCM_TRIGGER_STOP:
218 dmaengine_terminate_async(prtd->dma_chan);
219 break;
220 default:
221 return -EINVAL;
222 }
223
224 return 0;
225}
226EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_trigger);
227
228/**
229 * snd_dmaengine_pcm_pointer_no_residue - dmaengine based PCM pointer implementation
230 * @substream: PCM substream
231 *
232 * This function is deprecated and should not be used by new drivers, as its
233 * results may be unreliable.
234 */
235snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream)
236{
237 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
238 return bytes_to_frames(substream->runtime, prtd->pos);
239}
240EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer_no_residue);
241
242/**
243 * snd_dmaengine_pcm_pointer - dmaengine based PCM pointer implementation
244 * @substream: PCM substream
245 *
246 * This function can be used as the PCM pointer callback for dmaengine based PCM
247 * driver implementations.
248 */
249snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream)
250{
251 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
252 struct dma_tx_state state;
253 enum dma_status status;
254 unsigned int buf_size;
255 unsigned int pos = 0;
256
257 status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state);
258 if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) {
259 buf_size = snd_pcm_lib_buffer_bytes(substream);
260 if (state.residue > 0 && state.residue <= buf_size)
261 pos = buf_size - state.residue;
262 }
263
264 return bytes_to_frames(substream->runtime, pos);
265}
266EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer);
267
268/**
269 * snd_dmaengine_pcm_request_channel - Request channel for the dmaengine PCM
270 * @filter_fn: Filter function used to request the DMA channel
271 * @filter_data: Data passed to the DMA filter function
272 *
273 * Returns NULL or the requested DMA channel.
274 *
275 * This function request a DMA channel for usage with dmaengine PCM.
276 */
277struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
278 void *filter_data)
279{
280 dma_cap_mask_t mask;
281
282 dma_cap_zero(mask);
283 dma_cap_set(DMA_SLAVE, mask);
284 dma_cap_set(DMA_CYCLIC, mask);
285
286 return dma_request_channel(mask, filter_fn, filter_data);
287}
288EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel);
289
290/**
291 * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
292 * @substream: PCM substream
293 * @chan: DMA channel to use for data transfers
294 *
295 * Returns 0 on success, a negative error code otherwise.
296 *
297 * The function should usually be called from the pcm open callback. Note that
298 * this function will use private_data field of the substream's runtime. So it
299 * is not available to your pcm driver implementation.
300 */
301int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
302 struct dma_chan *chan)
303{
304 struct dmaengine_pcm_runtime_data *prtd;
305 int ret;
306
307 if (!chan)
308 return -ENXIO;
309
310 ret = snd_pcm_hw_constraint_integer(substream->runtime,
311 SNDRV_PCM_HW_PARAM_PERIODS);
312 if (ret < 0)
313 return ret;
314
315 prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
316 if (!prtd)
317 return -ENOMEM;
318
319 prtd->dma_chan = chan;
320
321 substream->runtime->private_data = prtd;
322
323 return 0;
324}
325EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open);
326
327/**
328 * snd_dmaengine_pcm_open_request_chan - Open a dmaengine based PCM substream and request channel
329 * @substream: PCM substream
330 * @filter_fn: Filter function used to request the DMA channel
331 * @filter_data: Data passed to the DMA filter function
332 *
333 * Returns 0 on success, a negative error code otherwise.
334 *
335 * This function will request a DMA channel using the passed filter function and
336 * data. The function should usually be called from the pcm open callback. Note
337 * that this function will use private_data field of the substream's runtime. So
338 * it is not available to your pcm driver implementation.
339 */
340int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
341 dma_filter_fn filter_fn, void *filter_data)
342{
343 return snd_dmaengine_pcm_open(substream,
344 snd_dmaengine_pcm_request_channel(filter_fn, filter_data));
345}
346EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan);
347
348/**
349 * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
350 * @substream: PCM substream
351 */
352int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
353{
354 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
355
356 dmaengine_synchronize(prtd->dma_chan);
357 kfree(prtd);
358
359 return 0;
360}
361EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close);
362
363/**
364 * snd_dmaengine_pcm_release_chan_close - Close a dmaengine based PCM substream and release channel
365 * @substream: PCM substream
366 *
367 * Releases the DMA channel associated with the PCM substream.
368 */
369int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream)
370{
371 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
372
373 dmaengine_synchronize(prtd->dma_chan);
374 dma_release_channel(prtd->dma_chan);
375 kfree(prtd);
376
377 return 0;
378}
379EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close_release_chan);
380
381MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2012, Analog Devices Inc.
4 * Author: Lars-Peter Clausen <lars@metafoo.de>
5 *
6 * Based on:
7 * imx-pcm-dma-mx2.c, Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
8 * mxs-pcm.c, Copyright (C) 2011 Freescale Semiconductor, Inc.
9 * ep93xx-pcm.c, Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
10 * Copyright (C) 2006 Applied Data Systems
11 */
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/dmaengine.h>
15#include <linux/slab.h>
16#include <sound/pcm.h>
17#include <sound/pcm_params.h>
18#include <sound/soc.h>
19
20#include <sound/dmaengine_pcm.h>
21
22struct dmaengine_pcm_runtime_data {
23 struct dma_chan *dma_chan;
24 dma_cookie_t cookie;
25
26 unsigned int pos;
27};
28
29static inline struct dmaengine_pcm_runtime_data *substream_to_prtd(
30 const struct snd_pcm_substream *substream)
31{
32 return substream->runtime->private_data;
33}
34
35struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream)
36{
37 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
38
39 return prtd->dma_chan;
40}
41EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_get_chan);
42
43/**
44 * snd_hwparams_to_dma_slave_config - Convert hw_params to dma_slave_config
45 * @substream: PCM substream
46 * @params: hw_params
47 * @slave_config: DMA slave config
48 *
49 * This function can be used to initialize a dma_slave_config from a substream
50 * and hw_params in a dmaengine based PCM driver implementation.
51 *
52 * Return: zero if successful, or a negative error code
53 */
54int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
55 const struct snd_pcm_hw_params *params,
56 struct dma_slave_config *slave_config)
57{
58 enum dma_slave_buswidth buswidth;
59 int bits;
60
61 bits = params_physical_width(params);
62 if (bits < 8 || bits > 64)
63 return -EINVAL;
64 else if (bits == 8)
65 buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
66 else if (bits == 16)
67 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
68 else if (bits == 24)
69 buswidth = DMA_SLAVE_BUSWIDTH_3_BYTES;
70 else if (bits <= 32)
71 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
72 else
73 buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES;
74
75 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
76 slave_config->direction = DMA_MEM_TO_DEV;
77 slave_config->dst_addr_width = buswidth;
78 } else {
79 slave_config->direction = DMA_DEV_TO_MEM;
80 slave_config->src_addr_width = buswidth;
81 }
82
83 slave_config->device_fc = false;
84
85 return 0;
86}
87EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config);
88
89/**
90 * snd_dmaengine_pcm_set_config_from_dai_data() - Initializes a dma slave config
91 * using DAI DMA data.
92 * @substream: PCM substream
93 * @dma_data: DAI DMA data
94 * @slave_config: DMA slave configuration
95 *
96 * Initializes the {dst,src}_addr, {dst,src}_maxburst, {dst,src}_addr_width
97 * fields of the DMA slave config from the same fields of the DAI DMA
98 * data struct. The src and dst fields will be initialized depending on the
99 * direction of the substream. If the substream is a playback stream the dst
100 * fields will be initialized, if it is a capture stream the src fields will be
101 * initialized. The {dst,src}_addr_width field will only be initialized if the
102 * SND_DMAENGINE_PCM_DAI_FLAG_PACK flag is set or if the addr_width field of
103 * the DAI DMA data struct is not equal to DMA_SLAVE_BUSWIDTH_UNDEFINED. If
104 * both conditions are met the latter takes priority.
105 */
106void snd_dmaengine_pcm_set_config_from_dai_data(
107 const struct snd_pcm_substream *substream,
108 const struct snd_dmaengine_dai_dma_data *dma_data,
109 struct dma_slave_config *slave_config)
110{
111 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
112 slave_config->dst_addr = dma_data->addr;
113 slave_config->dst_maxburst = dma_data->maxburst;
114 if (dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK)
115 slave_config->dst_addr_width =
116 DMA_SLAVE_BUSWIDTH_UNDEFINED;
117 if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED)
118 slave_config->dst_addr_width = dma_data->addr_width;
119 } else {
120 slave_config->src_addr = dma_data->addr;
121 slave_config->src_maxburst = dma_data->maxburst;
122 if (dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK)
123 slave_config->src_addr_width =
124 DMA_SLAVE_BUSWIDTH_UNDEFINED;
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->peripheral_config = dma_data->peripheral_config;
130 slave_config->peripheral_size = dma_data->peripheral_size;
131}
132EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_set_config_from_dai_data);
133
134static void dmaengine_pcm_dma_complete(void *arg)
135{
136 unsigned int new_pos;
137 struct snd_pcm_substream *substream = arg;
138 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
139
140 new_pos = prtd->pos + snd_pcm_lib_period_bytes(substream);
141 if (new_pos >= snd_pcm_lib_buffer_bytes(substream))
142 new_pos = 0;
143 prtd->pos = new_pos;
144
145 snd_pcm_period_elapsed(substream);
146}
147
148static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream)
149{
150 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
151 struct dma_chan *chan = prtd->dma_chan;
152 struct dma_async_tx_descriptor *desc;
153 enum dma_transfer_direction direction;
154 unsigned long flags = DMA_CTRL_ACK;
155
156 direction = snd_pcm_substream_to_dma_direction(substream);
157
158 if (!substream->runtime->no_period_wakeup)
159 flags |= DMA_PREP_INTERRUPT;
160
161 prtd->pos = 0;
162 desc = dmaengine_prep_dma_cyclic(chan,
163 substream->runtime->dma_addr,
164 snd_pcm_lib_buffer_bytes(substream),
165 snd_pcm_lib_period_bytes(substream), direction, flags);
166
167 if (!desc)
168 return -ENOMEM;
169
170 desc->callback = dmaengine_pcm_dma_complete;
171 desc->callback_param = substream;
172 prtd->cookie = dmaengine_submit(desc);
173
174 return 0;
175}
176
177/**
178 * snd_dmaengine_pcm_trigger - dmaengine based PCM trigger implementation
179 * @substream: PCM substream
180 * @cmd: Trigger command
181 *
182 * This function can be used as the PCM trigger callback for dmaengine based PCM
183 * driver implementations.
184 *
185 * Return: 0 on success, a negative error code otherwise
186 */
187int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
188{
189 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
190 struct snd_pcm_runtime *runtime = substream->runtime;
191 int ret;
192
193 switch (cmd) {
194 case SNDRV_PCM_TRIGGER_START:
195 ret = dmaengine_pcm_prepare_and_submit(substream);
196 if (ret)
197 return ret;
198 dma_async_issue_pending(prtd->dma_chan);
199 break;
200 case SNDRV_PCM_TRIGGER_RESUME:
201 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
202 dmaengine_resume(prtd->dma_chan);
203 break;
204 case SNDRV_PCM_TRIGGER_SUSPEND:
205 if (runtime->info & SNDRV_PCM_INFO_PAUSE)
206 dmaengine_pause(prtd->dma_chan);
207 else
208 dmaengine_terminate_async(prtd->dma_chan);
209 break;
210 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
211 dmaengine_pause(prtd->dma_chan);
212 break;
213 case SNDRV_PCM_TRIGGER_STOP:
214 dmaengine_terminate_async(prtd->dma_chan);
215 break;
216 default:
217 return -EINVAL;
218 }
219
220 return 0;
221}
222EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_trigger);
223
224/**
225 * snd_dmaengine_pcm_pointer_no_residue - dmaengine based PCM pointer implementation
226 * @substream: PCM substream
227 *
228 * This function is deprecated and should not be used by new drivers, as its
229 * results may be unreliable.
230 *
231 * Return: PCM position in frames
232 */
233snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream)
234{
235 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
236 return bytes_to_frames(substream->runtime, prtd->pos);
237}
238EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer_no_residue);
239
240/**
241 * snd_dmaengine_pcm_pointer - dmaengine based PCM pointer implementation
242 * @substream: PCM substream
243 *
244 * This function can be used as the PCM pointer callback for dmaengine based PCM
245 * driver implementations.
246 *
247 * Return: PCM position in frames
248 */
249snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream)
250{
251 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
252 struct snd_pcm_runtime *runtime = substream->runtime;
253 struct dma_tx_state state;
254 enum dma_status status;
255 unsigned int buf_size;
256 unsigned int pos = 0;
257
258 status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state);
259 if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) {
260 buf_size = snd_pcm_lib_buffer_bytes(substream);
261 if (state.residue > 0 && state.residue <= buf_size)
262 pos = buf_size - state.residue;
263
264 runtime->delay = bytes_to_frames(runtime,
265 state.in_flight_bytes);
266 }
267
268 return bytes_to_frames(runtime, pos);
269}
270EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer);
271
272/**
273 * snd_dmaengine_pcm_request_channel - Request channel for the dmaengine PCM
274 * @filter_fn: Filter function used to request the DMA channel
275 * @filter_data: Data passed to the DMA filter function
276 *
277 * This function request a DMA channel for usage with dmaengine PCM.
278 *
279 * Return: NULL or the requested DMA channel
280 */
281struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
282 void *filter_data)
283{
284 dma_cap_mask_t mask;
285
286 dma_cap_zero(mask);
287 dma_cap_set(DMA_SLAVE, mask);
288 dma_cap_set(DMA_CYCLIC, mask);
289
290 return dma_request_channel(mask, filter_fn, filter_data);
291}
292EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel);
293
294/**
295 * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
296 * @substream: PCM substream
297 * @chan: DMA channel to use for data transfers
298 *
299 * The function should usually be called from the pcm open callback. Note that
300 * this function will use private_data field of the substream's runtime. So it
301 * is not available to your pcm driver implementation.
302 *
303 * Return: 0 on success, a negative error code otherwise
304 */
305int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
306 struct dma_chan *chan)
307{
308 struct dmaengine_pcm_runtime_data *prtd;
309 int ret;
310
311 if (!chan)
312 return -ENXIO;
313
314 ret = snd_pcm_hw_constraint_integer(substream->runtime,
315 SNDRV_PCM_HW_PARAM_PERIODS);
316 if (ret < 0)
317 return ret;
318
319 prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
320 if (!prtd)
321 return -ENOMEM;
322
323 prtd->dma_chan = chan;
324
325 substream->runtime->private_data = prtd;
326
327 return 0;
328}
329EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open);
330
331/**
332 * snd_dmaengine_pcm_open_request_chan - Open a dmaengine based PCM substream and request channel
333 * @substream: PCM substream
334 * @filter_fn: Filter function used to request the DMA channel
335 * @filter_data: Data passed to the DMA filter function
336 *
337 * This function will request a DMA channel using the passed filter function and
338 * data. The function should usually be called from the pcm open callback. Note
339 * that this function will use private_data field of the substream's runtime. So
340 * it is not available to your pcm driver implementation.
341 *
342 * Return: 0 on success, a negative error code otherwise
343 */
344int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
345 dma_filter_fn filter_fn, void *filter_data)
346{
347 return snd_dmaengine_pcm_open(substream,
348 snd_dmaengine_pcm_request_channel(filter_fn, filter_data));
349}
350EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan);
351
352/**
353 * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
354 * @substream: PCM substream
355 *
356 * Return: 0 on success, a negative error code otherwise
357 */
358int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
359{
360 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
361
362 dmaengine_synchronize(prtd->dma_chan);
363 kfree(prtd);
364
365 return 0;
366}
367EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close);
368
369/**
370 * snd_dmaengine_pcm_close_release_chan - Close a dmaengine based PCM
371 * substream and release channel
372 * @substream: PCM substream
373 *
374 * Releases the DMA channel associated with the PCM substream.
375 *
376 * Return: zero if successful, or a negative error code
377 */
378int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream)
379{
380 struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
381
382 dmaengine_synchronize(prtd->dma_chan);
383 dma_release_channel(prtd->dma_chan);
384 kfree(prtd);
385
386 return 0;
387}
388EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close_release_chan);
389
390/**
391 * snd_dmaengine_pcm_refine_runtime_hwparams - Refine runtime hw params
392 * @substream: PCM substream
393 * @dma_data: DAI DMA data
394 * @hw: PCM hw params
395 * @chan: DMA channel to use for data transfers
396 *
397 * This function will query DMA capability, then refine the pcm hardware
398 * parameters.
399 *
400 * Return: 0 on success, a negative error code otherwise
401 */
402int snd_dmaengine_pcm_refine_runtime_hwparams(
403 struct snd_pcm_substream *substream,
404 struct snd_dmaengine_dai_dma_data *dma_data,
405 struct snd_pcm_hardware *hw,
406 struct dma_chan *chan)
407{
408 struct dma_slave_caps dma_caps;
409 u32 addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
410 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
411 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
412 snd_pcm_format_t i;
413 int ret = 0;
414
415 if (!hw || !chan || !dma_data)
416 return -EINVAL;
417
418 ret = dma_get_slave_caps(chan, &dma_caps);
419 if (ret == 0) {
420 if (dma_caps.cmd_pause && dma_caps.cmd_resume)
421 hw->info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
422 if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)
423 hw->info |= SNDRV_PCM_INFO_BATCH;
424
425 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
426 addr_widths = dma_caps.dst_addr_widths;
427 else
428 addr_widths = dma_caps.src_addr_widths;
429 }
430
431 /*
432 * If SND_DMAENGINE_PCM_DAI_FLAG_PACK is set keep
433 * hw.formats set to 0, meaning no restrictions are in place.
434 * In this case it's the responsibility of the DAI driver to
435 * provide the supported format information.
436 */
437 if (!(dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK))
438 /*
439 * Prepare formats mask for valid/allowed sample types. If the
440 * dma does not have support for the given physical word size,
441 * it needs to be masked out so user space can not use the
442 * format which produces corrupted audio.
443 * In case the dma driver does not implement the slave_caps the
444 * default assumption is that it supports 1, 2 and 4 bytes
445 * widths.
446 */
447 pcm_for_each_format(i) {
448 int bits = snd_pcm_format_physical_width(i);
449
450 /*
451 * Enable only samples with DMA supported physical
452 * widths
453 */
454 switch (bits) {
455 case 8:
456 case 16:
457 case 24:
458 case 32:
459 case 64:
460 if (addr_widths & (1 << (bits / 8)))
461 hw->formats |= pcm_format_to_bits(i);
462 break;
463 default:
464 /* Unsupported types */
465 break;
466 }
467 }
468
469 return ret;
470}
471EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_refine_runtime_hwparams);
472
473MODULE_LICENSE("GPL");