Commit | Line | Data |
---|---|---|
e7f73a16 LPC |
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; | |
3528f27a | 33 | dma_cookie_t cookie; |
e7f73a16 LPC |
34 | |
35 | unsigned int pos; | |
e7f73a16 LPC |
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 | ||
e7f73a16 LPC |
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; | |
a655f75c | 66 | int bits; |
e7f73a16 | 67 | |
732814c8 | 68 | bits = params_physical_width(params); |
a655f75c TI |
69 | if (bits < 8 || bits > 64) |
70 | return -EINVAL; | |
71 | else if (bits == 8) | |
e7f73a16 | 72 | buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; |
a655f75c | 73 | else if (bits == 16) |
e7f73a16 | 74 | buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; |
75f850fc PU |
75 | else if (bits == 24) |
76 | buswidth = DMA_SLAVE_BUSWIDTH_3_BYTES; | |
a655f75c | 77 | else if (bits <= 32) |
e7f73a16 | 78 | buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; |
a655f75c TI |
79 | else |
80 | buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES; | |
e7f73a16 LPC |
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 | ||
5fa70f71 LPC |
90 | slave_config->device_fc = false; |
91 | ||
e7f73a16 LPC |
92 | return 0; |
93 | } | |
94 | EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config); | |
95 | ||
85c9f9c5 LPC |
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 | ||
e7f73a16 LPC |
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; | |
e7736cde | 151 | unsigned long flags = DMA_CTRL_ACK; |
e7f73a16 LPC |
152 | |
153 | direction = snd_pcm_substream_to_dma_direction(substream); | |
154 | ||
e7736cde PU |
155 | if (!substream->runtime->no_period_wakeup) |
156 | flags |= DMA_PREP_INTERRUPT; | |
157 | ||
7a08cf70 | 158 | prtd->pos = 0; |
41ba6b71 | 159 | desc = dmaengine_prep_dma_cyclic(chan, |
e7f73a16 LPC |
160 | substream->runtime->dma_addr, |
161 | snd_pcm_lib_buffer_bytes(substream), | |
e7736cde | 162 | snd_pcm_lib_period_bytes(substream), direction, flags); |
e7f73a16 LPC |
163 | |
164 | if (!desc) | |
165 | return -ENOMEM; | |
166 | ||
167 | desc->callback = dmaengine_pcm_dma_complete; | |
168 | desc->callback_param = substream; | |
3528f27a | 169 | prtd->cookie = dmaengine_submit(desc); |
e7f73a16 LPC |
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); | |
02fb05a5 | 187 | struct snd_pcm_runtime *runtime = substream->runtime; |
e7f73a16 LPC |
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: | |
02fb05a5 TB |
202 | if (runtime->info & SNDRV_PCM_INFO_PAUSE) |
203 | dmaengine_pause(prtd->dma_chan); | |
204 | else | |
bc0e7345 | 205 | dmaengine_terminate_async(prtd->dma_chan); |
02fb05a5 | 206 | break; |
e7f73a16 LPC |
207 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
208 | dmaengine_pause(prtd->dma_chan); | |
209 | break; | |
210 | case SNDRV_PCM_TRIGGER_STOP: | |
bc0e7345 | 211 | dmaengine_terminate_async(prtd->dma_chan); |
e7f73a16 LPC |
212 | break; |
213 | default: | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_trigger); | |
220 | ||
221 | /** | |
9883ab22 | 222 | * snd_dmaengine_pcm_pointer_no_residue - dmaengine based PCM pointer implementation |
e7f73a16 LPC |
223 | * @substream: PCM substream |
224 | * | |
9883ab22 LPC |
225 | * This function is deprecated and should not be used by new drivers, as its |
226 | * results may be unreliable. | |
e7f73a16 | 227 | */ |
9883ab22 | 228 | snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream) |
e7f73a16 LPC |
229 | { |
230 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
231 | return bytes_to_frames(substream->runtime, prtd->pos); | |
232 | } | |
9883ab22 | 233 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer_no_residue); |
e7f73a16 | 234 | |
3528f27a LPC |
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 | ||
c999836d LPC |
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, | |
7c1c1d4a | 271 | void *filter_data) |
e7f73a16 LPC |
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); | |
e7f73a16 | 278 | |
7c1c1d4a | 279 | return dma_request_channel(mask, filter_fn, filter_data); |
e7f73a16 | 280 | } |
c999836d | 281 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel); |
e7f73a16 LPC |
282 | |
283 | /** | |
284 | * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream | |
285 | * @substream: PCM substream | |
7c1c1d4a | 286 | * @chan: DMA channel to use for data transfers |
e7f73a16 LPC |
287 | * |
288 | * Returns 0 on success, a negative error code otherwise. | |
289 | * | |
7c1c1d4a LPC |
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 | |
1a6ab46f | 292 | * is not available to your pcm driver implementation. |
e7f73a16 LPC |
293 | */ |
294 | int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, | |
7c1c1d4a | 295 | struct dma_chan *chan) |
e7f73a16 LPC |
296 | { |
297 | struct dmaengine_pcm_runtime_data *prtd; | |
298 | int ret; | |
299 | ||
7c1c1d4a LPC |
300 | if (!chan) |
301 | return -ENXIO; | |
302 | ||
e7f73a16 LPC |
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 | ||
7c1c1d4a | 312 | prtd->dma_chan = chan; |
e7f73a16 LPC |
313 | |
314 | substream->runtime->private_data = prtd; | |
315 | ||
316 | return 0; | |
317 | } | |
318 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open); | |
319 | ||
7c1c1d4a LPC |
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 | |
1a6ab46f | 331 | * it is not available to your pcm driver implementation. |
7c1c1d4a LPC |
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, | |
c999836d | 337 | snd_dmaengine_pcm_request_channel(filter_fn, filter_data)); |
7c1c1d4a LPC |
338 | } |
339 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan); | |
340 | ||
e7f73a16 LPC |
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 | ||
bc0e7345 | 349 | dmaengine_synchronize(prtd->dma_chan); |
e7f73a16 LPC |
350 | kfree(prtd); |
351 | ||
352 | return 0; | |
353 | } | |
354 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close); | |
cba69b4d | 355 | |
7c1c1d4a LPC |
356 | /** |
357 | * snd_dmaengine_pcm_release_chan_close - Close a dmaengine based PCM substream and release channel | |
358 | * @substream: PCM substream | |
359 | * | |
360 | * Releases the DMA channel associated with the PCM substream. | |
361 | */ | |
362 | int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream) | |
363 | { | |
364 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
365 | ||
bc0e7345 | 366 | dmaengine_synchronize(prtd->dma_chan); |
7c1c1d4a | 367 | dma_release_channel(prtd->dma_chan); |
bc0e7345 | 368 | kfree(prtd); |
7c1c1d4a | 369 | |
bc0e7345 | 370 | return 0; |
7c1c1d4a LPC |
371 | } |
372 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close_release_chan); | |
373 | ||
cba69b4d | 374 | MODULE_LICENSE("GPL"); |