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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; | |
66 | ||
67 | switch (params_format(params)) { | |
68 | case SNDRV_PCM_FORMAT_S8: | |
69 | buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; | |
70 | break; | |
71 | case SNDRV_PCM_FORMAT_S16_LE: | |
72 | buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; | |
73 | break; | |
74 | case SNDRV_PCM_FORMAT_S18_3LE: | |
75 | case SNDRV_PCM_FORMAT_S20_3LE: | |
76 | case SNDRV_PCM_FORMAT_S24_LE: | |
77 | case SNDRV_PCM_FORMAT_S32_LE: | |
78 | buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; | |
79 | break; | |
80 | default: | |
81 | return -EINVAL; | |
82 | } | |
83 | ||
84 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
85 | slave_config->direction = DMA_MEM_TO_DEV; | |
86 | slave_config->dst_addr_width = buswidth; | |
87 | } else { | |
88 | slave_config->direction = DMA_DEV_TO_MEM; | |
89 | slave_config->src_addr_width = buswidth; | |
90 | } | |
91 | ||
5fa70f71 LPC |
92 | slave_config->device_fc = false; |
93 | ||
e7f73a16 LPC |
94 | return 0; |
95 | } | |
96 | EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config); | |
97 | ||
85c9f9c5 LPC |
98 | /** |
99 | * snd_dmaengine_pcm_set_config_from_dai_data() - Initializes a dma slave config | |
100 | * using DAI DMA data. | |
101 | * @substream: PCM substream | |
102 | * @dma_data: DAI DMA data | |
103 | * @slave_config: DMA slave configuration | |
104 | * | |
105 | * Initializes the {dst,src}_addr, {dst,src}_maxburst, {dst,src}_addr_width and | |
106 | * slave_id fields of the DMA slave config from the same fields of the DAI DMA | |
107 | * data struct. The src and dst fields will be initialized depending on the | |
108 | * direction of the substream. If the substream is a playback stream the dst | |
109 | * fields will be initialized, if it is a capture stream the src fields will be | |
110 | * initialized. The {dst,src}_addr_width field will only be initialized if the | |
111 | * addr_width field of the DAI DMA data struct is not equal to | |
112 | * DMA_SLAVE_BUSWIDTH_UNDEFINED. | |
113 | */ | |
114 | void snd_dmaengine_pcm_set_config_from_dai_data( | |
115 | const struct snd_pcm_substream *substream, | |
116 | const struct snd_dmaengine_dai_dma_data *dma_data, | |
117 | struct dma_slave_config *slave_config) | |
118 | { | |
119 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
120 | slave_config->dst_addr = dma_data->addr; | |
121 | slave_config->dst_maxburst = dma_data->maxburst; | |
122 | if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED) | |
123 | slave_config->dst_addr_width = dma_data->addr_width; | |
124 | } else { | |
125 | slave_config->src_addr = dma_data->addr; | |
126 | slave_config->src_maxburst = dma_data->maxburst; | |
127 | if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED) | |
128 | slave_config->src_addr_width = dma_data->addr_width; | |
129 | } | |
130 | ||
131 | slave_config->slave_id = dma_data->slave_id; | |
132 | } | |
133 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_set_config_from_dai_data); | |
134 | ||
e7f73a16 LPC |
135 | static void dmaengine_pcm_dma_complete(void *arg) |
136 | { | |
137 | struct snd_pcm_substream *substream = arg; | |
138 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
139 | ||
140 | prtd->pos += snd_pcm_lib_period_bytes(substream); | |
141 | if (prtd->pos >= snd_pcm_lib_buffer_bytes(substream)) | |
142 | prtd->pos = 0; | |
143 | ||
144 | snd_pcm_period_elapsed(substream); | |
145 | } | |
146 | ||
147 | static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream) | |
148 | { | |
149 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
150 | struct dma_chan *chan = prtd->dma_chan; | |
151 | struct dma_async_tx_descriptor *desc; | |
152 | enum dma_transfer_direction direction; | |
e7736cde | 153 | unsigned long flags = DMA_CTRL_ACK; |
e7f73a16 LPC |
154 | |
155 | direction = snd_pcm_substream_to_dma_direction(substream); | |
156 | ||
e7736cde PU |
157 | if (!substream->runtime->no_period_wakeup) |
158 | flags |= DMA_PREP_INTERRUPT; | |
159 | ||
7a08cf70 | 160 | prtd->pos = 0; |
41ba6b71 | 161 | desc = dmaengine_prep_dma_cyclic(chan, |
e7f73a16 LPC |
162 | substream->runtime->dma_addr, |
163 | snd_pcm_lib_buffer_bytes(substream), | |
e7736cde | 164 | snd_pcm_lib_period_bytes(substream), direction, flags); |
e7f73a16 LPC |
165 | |
166 | if (!desc) | |
167 | return -ENOMEM; | |
168 | ||
169 | desc->callback = dmaengine_pcm_dma_complete; | |
170 | desc->callback_param = substream; | |
3528f27a | 171 | prtd->cookie = dmaengine_submit(desc); |
e7f73a16 LPC |
172 | |
173 | return 0; | |
174 | } | |
175 | ||
176 | /** | |
177 | * snd_dmaengine_pcm_trigger - dmaengine based PCM trigger implementation | |
178 | * @substream: PCM substream | |
179 | * @cmd: Trigger command | |
180 | * | |
181 | * Returns 0 on success, a negative error code otherwise. | |
182 | * | |
183 | * This function can be used as the PCM trigger callback for dmaengine based PCM | |
184 | * driver implementations. | |
185 | */ | |
186 | int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
187 | { | |
188 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
189 | int ret; | |
190 | ||
191 | switch (cmd) { | |
192 | case SNDRV_PCM_TRIGGER_START: | |
193 | ret = dmaengine_pcm_prepare_and_submit(substream); | |
194 | if (ret) | |
195 | return ret; | |
196 | dma_async_issue_pending(prtd->dma_chan); | |
197 | break; | |
198 | case SNDRV_PCM_TRIGGER_RESUME: | |
199 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
200 | dmaengine_resume(prtd->dma_chan); | |
201 | break; | |
202 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
203 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
204 | dmaengine_pause(prtd->dma_chan); | |
205 | break; | |
206 | case SNDRV_PCM_TRIGGER_STOP: | |
207 | dmaengine_terminate_all(prtd->dma_chan); | |
208 | break; | |
209 | default: | |
210 | return -EINVAL; | |
211 | } | |
212 | ||
213 | return 0; | |
214 | } | |
215 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_trigger); | |
216 | ||
217 | /** | |
9883ab22 | 218 | * snd_dmaengine_pcm_pointer_no_residue - dmaengine based PCM pointer implementation |
e7f73a16 LPC |
219 | * @substream: PCM substream |
220 | * | |
9883ab22 LPC |
221 | * This function is deprecated and should not be used by new drivers, as its |
222 | * results may be unreliable. | |
e7f73a16 | 223 | */ |
9883ab22 | 224 | snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream) |
e7f73a16 LPC |
225 | { |
226 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
227 | return bytes_to_frames(substream->runtime, prtd->pos); | |
228 | } | |
9883ab22 | 229 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer_no_residue); |
e7f73a16 | 230 | |
3528f27a LPC |
231 | /** |
232 | * snd_dmaengine_pcm_pointer - dmaengine based PCM pointer implementation | |
233 | * @substream: PCM substream | |
234 | * | |
235 | * This function can be used as the PCM pointer callback for dmaengine based PCM | |
236 | * driver implementations. | |
237 | */ | |
238 | snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream) | |
239 | { | |
240 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
241 | struct dma_tx_state state; | |
242 | enum dma_status status; | |
243 | unsigned int buf_size; | |
244 | unsigned int pos = 0; | |
245 | ||
246 | status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state); | |
247 | if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) { | |
248 | buf_size = snd_pcm_lib_buffer_bytes(substream); | |
249 | if (state.residue > 0 && state.residue <= buf_size) | |
250 | pos = buf_size - state.residue; | |
251 | } | |
252 | ||
253 | return bytes_to_frames(substream->runtime, pos); | |
254 | } | |
255 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer); | |
256 | ||
c999836d LPC |
257 | /** |
258 | * snd_dmaengine_pcm_request_channel - Request channel for the dmaengine PCM | |
259 | * @filter_fn: Filter function used to request the DMA channel | |
260 | * @filter_data: Data passed to the DMA filter function | |
261 | * | |
262 | * Returns NULL or the requested DMA channel. | |
263 | * | |
264 | * This function request a DMA channel for usage with dmaengine PCM. | |
265 | */ | |
266 | struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn, | |
7c1c1d4a | 267 | void *filter_data) |
e7f73a16 LPC |
268 | { |
269 | dma_cap_mask_t mask; | |
270 | ||
271 | dma_cap_zero(mask); | |
272 | dma_cap_set(DMA_SLAVE, mask); | |
273 | dma_cap_set(DMA_CYCLIC, mask); | |
e7f73a16 | 274 | |
7c1c1d4a | 275 | return dma_request_channel(mask, filter_fn, filter_data); |
e7f73a16 | 276 | } |
c999836d | 277 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel); |
e7f73a16 LPC |
278 | |
279 | /** | |
280 | * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream | |
281 | * @substream: PCM substream | |
7c1c1d4a | 282 | * @chan: DMA channel to use for data transfers |
e7f73a16 LPC |
283 | * |
284 | * Returns 0 on success, a negative error code otherwise. | |
285 | * | |
7c1c1d4a LPC |
286 | * The function should usually be called from the pcm open callback. Note that |
287 | * this function will use private_data field of the substream's runtime. So it | |
288 | * is not availabe to your pcm driver implementation. | |
e7f73a16 LPC |
289 | */ |
290 | int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, | |
7c1c1d4a | 291 | struct dma_chan *chan) |
e7f73a16 LPC |
292 | { |
293 | struct dmaengine_pcm_runtime_data *prtd; | |
294 | int ret; | |
295 | ||
7c1c1d4a LPC |
296 | if (!chan) |
297 | return -ENXIO; | |
298 | ||
e7f73a16 LPC |
299 | ret = snd_pcm_hw_constraint_integer(substream->runtime, |
300 | SNDRV_PCM_HW_PARAM_PERIODS); | |
301 | if (ret < 0) | |
302 | return ret; | |
303 | ||
304 | prtd = kzalloc(sizeof(*prtd), GFP_KERNEL); | |
305 | if (!prtd) | |
306 | return -ENOMEM; | |
307 | ||
7c1c1d4a | 308 | prtd->dma_chan = chan; |
e7f73a16 LPC |
309 | |
310 | substream->runtime->private_data = prtd; | |
311 | ||
312 | return 0; | |
313 | } | |
314 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open); | |
315 | ||
7c1c1d4a LPC |
316 | /** |
317 | * snd_dmaengine_pcm_open_request_chan - Open a dmaengine based PCM substream and request channel | |
318 | * @substream: PCM substream | |
319 | * @filter_fn: Filter function used to request the DMA channel | |
320 | * @filter_data: Data passed to the DMA filter function | |
321 | * | |
322 | * Returns 0 on success, a negative error code otherwise. | |
323 | * | |
324 | * This function will request a DMA channel using the passed filter function and | |
325 | * data. The function should usually be called from the pcm open callback. Note | |
326 | * that this function will use private_data field of the substream's runtime. So | |
327 | * it is not availabe to your pcm driver implementation. | |
328 | */ | |
329 | int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, | |
330 | dma_filter_fn filter_fn, void *filter_data) | |
331 | { | |
332 | return snd_dmaengine_pcm_open(substream, | |
c999836d | 333 | snd_dmaengine_pcm_request_channel(filter_fn, filter_data)); |
7c1c1d4a LPC |
334 | } |
335 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan); | |
336 | ||
e7f73a16 LPC |
337 | /** |
338 | * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream | |
339 | * @substream: PCM substream | |
340 | */ | |
341 | int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream) | |
342 | { | |
343 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
344 | ||
e7f73a16 LPC |
345 | kfree(prtd); |
346 | ||
347 | return 0; | |
348 | } | |
349 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close); | |
cba69b4d | 350 | |
7c1c1d4a LPC |
351 | /** |
352 | * snd_dmaengine_pcm_release_chan_close - Close a dmaengine based PCM substream and release channel | |
353 | * @substream: PCM substream | |
354 | * | |
355 | * Releases the DMA channel associated with the PCM substream. | |
356 | */ | |
357 | int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream) | |
358 | { | |
359 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
360 | ||
361 | dma_release_channel(prtd->dma_chan); | |
362 | ||
363 | return snd_dmaengine_pcm_close(substream); | |
364 | } | |
365 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close_release_chan); | |
366 | ||
cba69b4d | 367 | MODULE_LICENSE("GPL"); |