Root/
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 | |
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 | |
92 | slave_config->device_fc = false; |
93 | |
94 | return 0; |
95 | } |
96 | EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config); |
97 | |
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 | |
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; |
153 | unsigned long flags = DMA_CTRL_ACK; |
154 | |
155 | direction = snd_pcm_substream_to_dma_direction(substream); |
156 | |
157 | if (!substream->runtime->no_period_wakeup) |
158 | flags |= DMA_PREP_INTERRUPT; |
159 | |
160 | prtd->pos = 0; |
161 | desc = dmaengine_prep_dma_cyclic(chan, |
162 | substream->runtime->dma_addr, |
163 | snd_pcm_lib_buffer_bytes(substream), |
164 | snd_pcm_lib_period_bytes(substream), direction, flags); |
165 | |
166 | if (!desc) |
167 | return -ENOMEM; |
168 | |
169 | desc->callback = dmaengine_pcm_dma_complete; |
170 | desc->callback_param = substream; |
171 | prtd->cookie = dmaengine_submit(desc); |
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 | /** |
218 | * snd_dmaengine_pcm_pointer_no_residue - dmaengine based PCM pointer implementation |
219 | * @substream: PCM substream |
220 | * |
221 | * This function is deprecated and should not be used by new drivers, as its |
222 | * results may be unreliable. |
223 | */ |
224 | snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream) |
225 | { |
226 | struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream); |
227 | return bytes_to_frames(substream->runtime, prtd->pos); |
228 | } |
229 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer_no_residue); |
230 | |
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 | |
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, |
267 | void *filter_data) |
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); |
274 | |
275 | return dma_request_channel(mask, filter_fn, filter_data); |
276 | } |
277 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel); |
278 | |
279 | /** |
280 | * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream |
281 | * @substream: PCM substream |
282 | * @chan: DMA channel to use for data transfers |
283 | * |
284 | * Returns 0 on success, a negative error code otherwise. |
285 | * |
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. |
289 | */ |
290 | int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, |
291 | struct dma_chan *chan) |
292 | { |
293 | struct dmaengine_pcm_runtime_data *prtd; |
294 | int ret; |
295 | |
296 | if (!chan) |
297 | return -ENXIO; |
298 | |
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 | |
308 | prtd->dma_chan = chan; |
309 | |
310 | substream->runtime->private_data = prtd; |
311 | |
312 | return 0; |
313 | } |
314 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open); |
315 | |
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, |
333 | snd_dmaengine_pcm_request_channel(filter_fn, filter_data)); |
334 | } |
335 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan); |
336 | |
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 | |
345 | kfree(prtd); |
346 | |
347 | return 0; |
348 | } |
349 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close); |
350 | |
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 | |
367 | MODULE_LICENSE("GPL"); |
368 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9