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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; | |
a655f75c | 66 | int bits; |
e7f73a16 | 67 | |
a655f75c TI |
68 | bits = snd_pcm_format_physical_width(params_format(params)); |
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; |
a655f75c | 75 | else if (bits <= 32) |
e7f73a16 | 76 | buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; |
a655f75c TI |
77 | else |
78 | buswidth = DMA_SLAVE_BUSWIDTH_8_BYTES; | |
e7f73a16 LPC |
79 | |
80 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
81 | slave_config->direction = DMA_MEM_TO_DEV; | |
82 | slave_config->dst_addr_width = buswidth; | |
83 | } else { | |
84 | slave_config->direction = DMA_DEV_TO_MEM; | |
85 | slave_config->src_addr_width = buswidth; | |
86 | } | |
87 | ||
5fa70f71 LPC |
88 | slave_config->device_fc = false; |
89 | ||
e7f73a16 LPC |
90 | return 0; |
91 | } | |
92 | EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config); | |
93 | ||
85c9f9c5 LPC |
94 | /** |
95 | * snd_dmaengine_pcm_set_config_from_dai_data() - Initializes a dma slave config | |
96 | * using DAI DMA data. | |
97 | * @substream: PCM substream | |
98 | * @dma_data: DAI DMA data | |
99 | * @slave_config: DMA slave configuration | |
100 | * | |
101 | * Initializes the {dst,src}_addr, {dst,src}_maxburst, {dst,src}_addr_width and | |
102 | * slave_id fields of the DMA slave config from the same fields of the DAI DMA | |
103 | * data struct. The src and dst fields will be initialized depending on the | |
104 | * direction of the substream. If the substream is a playback stream the dst | |
105 | * fields will be initialized, if it is a capture stream the src fields will be | |
106 | * initialized. The {dst,src}_addr_width field will only be initialized if the | |
107 | * addr_width field of the DAI DMA data struct is not equal to | |
108 | * DMA_SLAVE_BUSWIDTH_UNDEFINED. | |
109 | */ | |
110 | void snd_dmaengine_pcm_set_config_from_dai_data( | |
111 | const struct snd_pcm_substream *substream, | |
112 | const struct snd_dmaengine_dai_dma_data *dma_data, | |
113 | struct dma_slave_config *slave_config) | |
114 | { | |
115 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
116 | slave_config->dst_addr = dma_data->addr; | |
117 | slave_config->dst_maxburst = dma_data->maxburst; | |
118 | if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED) | |
119 | slave_config->dst_addr_width = dma_data->addr_width; | |
120 | } else { | |
121 | slave_config->src_addr = dma_data->addr; | |
122 | slave_config->src_maxburst = dma_data->maxburst; | |
123 | if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED) | |
124 | slave_config->src_addr_width = dma_data->addr_width; | |
125 | } | |
126 | ||
127 | slave_config->slave_id = dma_data->slave_id; | |
128 | } | |
129 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_set_config_from_dai_data); | |
130 | ||
e7f73a16 LPC |
131 | static void dmaengine_pcm_dma_complete(void *arg) |
132 | { | |
133 | struct snd_pcm_substream *substream = arg; | |
134 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
135 | ||
136 | prtd->pos += snd_pcm_lib_period_bytes(substream); | |
137 | if (prtd->pos >= snd_pcm_lib_buffer_bytes(substream)) | |
138 | prtd->pos = 0; | |
139 | ||
140 | snd_pcm_period_elapsed(substream); | |
141 | } | |
142 | ||
143 | static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream) | |
144 | { | |
145 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
146 | struct dma_chan *chan = prtd->dma_chan; | |
147 | struct dma_async_tx_descriptor *desc; | |
148 | enum dma_transfer_direction direction; | |
e7736cde | 149 | unsigned long flags = DMA_CTRL_ACK; |
e7f73a16 LPC |
150 | |
151 | direction = snd_pcm_substream_to_dma_direction(substream); | |
152 | ||
e7736cde PU |
153 | if (!substream->runtime->no_period_wakeup) |
154 | flags |= DMA_PREP_INTERRUPT; | |
155 | ||
7a08cf70 | 156 | prtd->pos = 0; |
41ba6b71 | 157 | desc = dmaengine_prep_dma_cyclic(chan, |
e7f73a16 LPC |
158 | substream->runtime->dma_addr, |
159 | snd_pcm_lib_buffer_bytes(substream), | |
e7736cde | 160 | snd_pcm_lib_period_bytes(substream), direction, flags); |
e7f73a16 LPC |
161 | |
162 | if (!desc) | |
163 | return -ENOMEM; | |
164 | ||
165 | desc->callback = dmaengine_pcm_dma_complete; | |
166 | desc->callback_param = substream; | |
3528f27a | 167 | prtd->cookie = dmaengine_submit(desc); |
e7f73a16 LPC |
168 | |
169 | return 0; | |
170 | } | |
171 | ||
172 | /** | |
173 | * snd_dmaengine_pcm_trigger - dmaengine based PCM trigger implementation | |
174 | * @substream: PCM substream | |
175 | * @cmd: Trigger command | |
176 | * | |
177 | * Returns 0 on success, a negative error code otherwise. | |
178 | * | |
179 | * This function can be used as the PCM trigger callback for dmaengine based PCM | |
180 | * driver implementations. | |
181 | */ | |
182 | int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
183 | { | |
184 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
185 | int ret; | |
186 | ||
187 | switch (cmd) { | |
188 | case SNDRV_PCM_TRIGGER_START: | |
189 | ret = dmaengine_pcm_prepare_and_submit(substream); | |
190 | if (ret) | |
191 | return ret; | |
192 | dma_async_issue_pending(prtd->dma_chan); | |
193 | break; | |
194 | case SNDRV_PCM_TRIGGER_RESUME: | |
195 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
196 | dmaengine_resume(prtd->dma_chan); | |
197 | break; | |
198 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
199 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
200 | dmaengine_pause(prtd->dma_chan); | |
201 | break; | |
202 | case SNDRV_PCM_TRIGGER_STOP: | |
203 | dmaengine_terminate_all(prtd->dma_chan); | |
204 | break; | |
205 | default: | |
206 | return -EINVAL; | |
207 | } | |
208 | ||
209 | return 0; | |
210 | } | |
211 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_trigger); | |
212 | ||
213 | /** | |
9883ab22 | 214 | * snd_dmaengine_pcm_pointer_no_residue - dmaengine based PCM pointer implementation |
e7f73a16 LPC |
215 | * @substream: PCM substream |
216 | * | |
9883ab22 LPC |
217 | * This function is deprecated and should not be used by new drivers, as its |
218 | * results may be unreliable. | |
e7f73a16 | 219 | */ |
9883ab22 | 220 | snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream) |
e7f73a16 LPC |
221 | { |
222 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
223 | return bytes_to_frames(substream->runtime, prtd->pos); | |
224 | } | |
9883ab22 | 225 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer_no_residue); |
e7f73a16 | 226 | |
3528f27a LPC |
227 | /** |
228 | * snd_dmaengine_pcm_pointer - dmaengine based PCM pointer implementation | |
229 | * @substream: PCM substream | |
230 | * | |
231 | * This function can be used as the PCM pointer callback for dmaengine based PCM | |
232 | * driver implementations. | |
233 | */ | |
234 | snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream) | |
235 | { | |
236 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
237 | struct dma_tx_state state; | |
238 | enum dma_status status; | |
239 | unsigned int buf_size; | |
240 | unsigned int pos = 0; | |
241 | ||
242 | status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state); | |
243 | if (status == DMA_IN_PROGRESS || status == DMA_PAUSED) { | |
244 | buf_size = snd_pcm_lib_buffer_bytes(substream); | |
245 | if (state.residue > 0 && state.residue <= buf_size) | |
246 | pos = buf_size - state.residue; | |
247 | } | |
248 | ||
249 | return bytes_to_frames(substream->runtime, pos); | |
250 | } | |
251 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer); | |
252 | ||
c999836d LPC |
253 | /** |
254 | * snd_dmaengine_pcm_request_channel - Request channel for the dmaengine PCM | |
255 | * @filter_fn: Filter function used to request the DMA channel | |
256 | * @filter_data: Data passed to the DMA filter function | |
257 | * | |
258 | * Returns NULL or the requested DMA channel. | |
259 | * | |
260 | * This function request a DMA channel for usage with dmaengine PCM. | |
261 | */ | |
262 | struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn, | |
7c1c1d4a | 263 | void *filter_data) |
e7f73a16 LPC |
264 | { |
265 | dma_cap_mask_t mask; | |
266 | ||
267 | dma_cap_zero(mask); | |
268 | dma_cap_set(DMA_SLAVE, mask); | |
269 | dma_cap_set(DMA_CYCLIC, mask); | |
e7f73a16 | 270 | |
7c1c1d4a | 271 | return dma_request_channel(mask, filter_fn, filter_data); |
e7f73a16 | 272 | } |
c999836d | 273 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel); |
e7f73a16 LPC |
274 | |
275 | /** | |
276 | * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream | |
277 | * @substream: PCM substream | |
7c1c1d4a | 278 | * @chan: DMA channel to use for data transfers |
e7f73a16 LPC |
279 | * |
280 | * Returns 0 on success, a negative error code otherwise. | |
281 | * | |
7c1c1d4a LPC |
282 | * The function should usually be called from the pcm open callback. Note that |
283 | * this function will use private_data field of the substream's runtime. So it | |
284 | * is not availabe to your pcm driver implementation. | |
e7f73a16 LPC |
285 | */ |
286 | int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, | |
7c1c1d4a | 287 | struct dma_chan *chan) |
e7f73a16 LPC |
288 | { |
289 | struct dmaengine_pcm_runtime_data *prtd; | |
290 | int ret; | |
291 | ||
7c1c1d4a LPC |
292 | if (!chan) |
293 | return -ENXIO; | |
294 | ||
e7f73a16 LPC |
295 | ret = snd_pcm_hw_constraint_integer(substream->runtime, |
296 | SNDRV_PCM_HW_PARAM_PERIODS); | |
297 | if (ret < 0) | |
298 | return ret; | |
299 | ||
300 | prtd = kzalloc(sizeof(*prtd), GFP_KERNEL); | |
301 | if (!prtd) | |
302 | return -ENOMEM; | |
303 | ||
7c1c1d4a | 304 | prtd->dma_chan = chan; |
e7f73a16 LPC |
305 | |
306 | substream->runtime->private_data = prtd; | |
307 | ||
308 | return 0; | |
309 | } | |
310 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open); | |
311 | ||
7c1c1d4a LPC |
312 | /** |
313 | * snd_dmaengine_pcm_open_request_chan - Open a dmaengine based PCM substream and request channel | |
314 | * @substream: PCM substream | |
315 | * @filter_fn: Filter function used to request the DMA channel | |
316 | * @filter_data: Data passed to the DMA filter function | |
317 | * | |
318 | * Returns 0 on success, a negative error code otherwise. | |
319 | * | |
320 | * This function will request a DMA channel using the passed filter function and | |
321 | * data. The function should usually be called from the pcm open callback. Note | |
322 | * that this function will use private_data field of the substream's runtime. So | |
323 | * it is not availabe to your pcm driver implementation. | |
324 | */ | |
325 | int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, | |
326 | dma_filter_fn filter_fn, void *filter_data) | |
327 | { | |
328 | return snd_dmaengine_pcm_open(substream, | |
c999836d | 329 | snd_dmaengine_pcm_request_channel(filter_fn, filter_data)); |
7c1c1d4a LPC |
330 | } |
331 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan); | |
332 | ||
e7f73a16 LPC |
333 | /** |
334 | * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream | |
335 | * @substream: PCM substream | |
336 | */ | |
337 | int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream) | |
338 | { | |
339 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
340 | ||
e7f73a16 LPC |
341 | kfree(prtd); |
342 | ||
343 | return 0; | |
344 | } | |
345 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close); | |
cba69b4d | 346 | |
7c1c1d4a LPC |
347 | /** |
348 | * snd_dmaengine_pcm_release_chan_close - Close a dmaengine based PCM substream and release channel | |
349 | * @substream: PCM substream | |
350 | * | |
351 | * Releases the DMA channel associated with the PCM substream. | |
352 | */ | |
353 | int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream) | |
354 | { | |
355 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); | |
356 | ||
357 | dma_release_channel(prtd->dma_chan); | |
358 | ||
359 | return snd_dmaengine_pcm_close(substream); | |
360 | } | |
361 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close_release_chan); | |
362 | ||
cba69b4d | 363 | MODULE_LICENSE("GPL"); |