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ed6e1d04 DA |
1 | /* |
2 | * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved. | |
3 | * | |
4 | * Based on sound/soc/imx/imx-pcm-dma-mx2.c | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
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 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | #include <linux/clk.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/dma-mapping.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/interrupt.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/platform_device.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/dmaengine.h> | |
31 | ||
32 | #include <sound/core.h> | |
33 | #include <sound/initval.h> | |
34 | #include <sound/pcm.h> | |
35 | #include <sound/pcm_params.h> | |
36 | #include <sound/soc.h> | |
37 | ||
38 | #include <mach/dma.h> | |
39 | #include "mxs-pcm.h" | |
40 | ||
41 | static struct snd_pcm_hardware snd_mxs_hardware = { | |
42 | .info = SNDRV_PCM_INFO_MMAP | | |
43 | SNDRV_PCM_INFO_MMAP_VALID | | |
44 | SNDRV_PCM_INFO_PAUSE | | |
45 | SNDRV_PCM_INFO_RESUME | | |
46 | SNDRV_PCM_INFO_INTERLEAVED, | |
47 | .formats = SNDRV_PCM_FMTBIT_S16_LE | | |
48 | SNDRV_PCM_FMTBIT_S20_3LE | | |
49 | SNDRV_PCM_FMTBIT_S24_LE, | |
50 | .channels_min = 2, | |
51 | .channels_max = 2, | |
52 | .period_bytes_min = 32, | |
53 | .period_bytes_max = 8192, | |
54 | .periods_min = 1, | |
55 | .periods_max = 52, | |
56 | .buffer_bytes_max = 64 * 1024, | |
57 | .fifo_size = 32, | |
58 | ||
59 | }; | |
60 | ||
61 | static void audio_dma_irq(void *data) | |
62 | { | |
63 | struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data; | |
64 | struct snd_pcm_runtime *runtime = substream->runtime; | |
65 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; | |
66 | ||
67 | iprtd->offset += iprtd->period_bytes; | |
68 | iprtd->offset %= iprtd->period_bytes * iprtd->periods; | |
69 | snd_pcm_period_elapsed(substream); | |
70 | } | |
71 | ||
72 | static bool filter(struct dma_chan *chan, void *param) | |
73 | { | |
74 | struct mxs_pcm_runtime_data *iprtd = param; | |
75 | struct mxs_pcm_dma_params *dma_params = iprtd->dma_params; | |
76 | ||
77 | if (!mxs_dma_is_apbx(chan)) | |
78 | return false; | |
79 | ||
80 | if (chan->chan_id != dma_params->chan_num) | |
81 | return false; | |
82 | ||
83 | chan->private = &iprtd->dma_data; | |
84 | ||
85 | return true; | |
86 | } | |
87 | ||
88 | static int mxs_dma_alloc(struct snd_pcm_substream *substream, | |
89 | struct snd_pcm_hw_params *params) | |
90 | { | |
91 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
92 | struct snd_pcm_runtime *runtime = substream->runtime; | |
93 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; | |
94 | dma_cap_mask_t mask; | |
95 | ||
96 | iprtd->dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); | |
97 | ||
98 | dma_cap_zero(mask); | |
99 | dma_cap_set(DMA_SLAVE, mask); | |
100 | iprtd->dma_data.chan_irq = iprtd->dma_params->chan_irq; | |
101 | iprtd->dma_chan = dma_request_channel(mask, filter, iprtd); | |
102 | if (!iprtd->dma_chan) | |
103 | return -EINVAL; | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream, | |
109 | struct snd_pcm_hw_params *params) | |
110 | { | |
111 | struct snd_pcm_runtime *runtime = substream->runtime; | |
112 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; | |
113 | unsigned long dma_addr; | |
114 | struct dma_chan *chan; | |
115 | int ret; | |
116 | ||
117 | ret = mxs_dma_alloc(substream, params); | |
118 | if (ret) | |
119 | return ret; | |
120 | chan = iprtd->dma_chan; | |
121 | ||
122 | iprtd->size = params_buffer_bytes(params); | |
123 | iprtd->periods = params_periods(params); | |
124 | iprtd->period_bytes = params_period_bytes(params); | |
125 | iprtd->offset = 0; | |
126 | iprtd->period_time = HZ / (params_rate(params) / | |
127 | params_period_size(params)); | |
128 | ||
129 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
130 | ||
131 | dma_addr = runtime->dma_addr; | |
132 | ||
133 | iprtd->buf = substream->dma_buffer.area; | |
134 | ||
135 | iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr, | |
136 | iprtd->period_bytes * iprtd->periods, | |
137 | iprtd->period_bytes, | |
138 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? | |
139 | DMA_TO_DEVICE : DMA_FROM_DEVICE); | |
140 | if (!iprtd->desc) { | |
141 | dev_err(&chan->dev->device, "cannot prepare slave dma\n"); | |
142 | return -EINVAL; | |
143 | } | |
144 | ||
145 | iprtd->desc->callback = audio_dma_irq; | |
146 | iprtd->desc->callback_param = substream; | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static int snd_mxs_pcm_hw_free(struct snd_pcm_substream *substream) | |
152 | { | |
153 | struct snd_pcm_runtime *runtime = substream->runtime; | |
154 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; | |
155 | ||
156 | if (iprtd->dma_chan) { | |
157 | dma_release_channel(iprtd->dma_chan); | |
158 | iprtd->dma_chan = NULL; | |
159 | } | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static int snd_mxs_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
165 | { | |
166 | struct snd_pcm_runtime *runtime = substream->runtime; | |
167 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; | |
168 | ||
169 | switch (cmd) { | |
170 | case SNDRV_PCM_TRIGGER_START: | |
171 | case SNDRV_PCM_TRIGGER_RESUME: | |
172 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
173 | dmaengine_submit(iprtd->desc); | |
174 | ||
175 | break; | |
176 | case SNDRV_PCM_TRIGGER_STOP: | |
177 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
178 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
179 | dmaengine_terminate_all(iprtd->dma_chan); | |
180 | ||
181 | break; | |
182 | default: | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | static snd_pcm_uframes_t snd_mxs_pcm_pointer( | |
190 | struct snd_pcm_substream *substream) | |
191 | { | |
192 | struct snd_pcm_runtime *runtime = substream->runtime; | |
193 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; | |
194 | ||
195 | return bytes_to_frames(substream->runtime, iprtd->offset); | |
196 | } | |
197 | ||
198 | static int snd_mxs_open(struct snd_pcm_substream *substream) | |
199 | { | |
200 | struct snd_pcm_runtime *runtime = substream->runtime; | |
201 | struct mxs_pcm_runtime_data *iprtd; | |
202 | int ret; | |
203 | ||
204 | iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL); | |
205 | if (iprtd == NULL) | |
206 | return -ENOMEM; | |
207 | runtime->private_data = iprtd; | |
208 | ||
209 | ret = snd_pcm_hw_constraint_integer(substream->runtime, | |
210 | SNDRV_PCM_HW_PARAM_PERIODS); | |
211 | if (ret < 0) { | |
212 | kfree(iprtd); | |
213 | return ret; | |
214 | } | |
215 | ||
216 | snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware); | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static int snd_mxs_close(struct snd_pcm_substream *substream) | |
222 | { | |
223 | struct snd_pcm_runtime *runtime = substream->runtime; | |
224 | struct mxs_pcm_runtime_data *iprtd = runtime->private_data; | |
225 | ||
226 | kfree(iprtd); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream, | |
232 | struct vm_area_struct *vma) | |
233 | { | |
234 | struct snd_pcm_runtime *runtime = substream->runtime; | |
235 | ||
236 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
237 | runtime->dma_area, | |
238 | runtime->dma_addr, | |
239 | runtime->dma_bytes); | |
240 | } | |
241 | ||
242 | static struct snd_pcm_ops mxs_pcm_ops = { | |
243 | .open = snd_mxs_open, | |
244 | .close = snd_mxs_close, | |
245 | .ioctl = snd_pcm_lib_ioctl, | |
246 | .hw_params = snd_mxs_pcm_hw_params, | |
247 | .hw_free = snd_mxs_pcm_hw_free, | |
248 | .trigger = snd_mxs_pcm_trigger, | |
249 | .pointer = snd_mxs_pcm_pointer, | |
250 | .mmap = snd_mxs_pcm_mmap, | |
251 | }; | |
252 | ||
253 | static int mxs_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) | |
254 | { | |
255 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
256 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
257 | size_t size = snd_mxs_hardware.buffer_bytes_max; | |
258 | ||
259 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
260 | buf->dev.dev = pcm->card->dev; | |
261 | buf->private_data = NULL; | |
262 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
263 | &buf->addr, GFP_KERNEL); | |
264 | if (!buf->area) | |
265 | return -ENOMEM; | |
266 | buf->bytes = size; | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | static u64 mxs_pcm_dmamask = DMA_BIT_MASK(32); | |
272 | static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd) | |
273 | { | |
274 | struct snd_card *card = rtd->card->snd_card; | |
275 | struct snd_pcm *pcm = rtd->pcm; | |
276 | int ret = 0; | |
277 | ||
278 | if (!card->dev->dma_mask) | |
279 | card->dev->dma_mask = &mxs_pcm_dmamask; | |
280 | if (!card->dev->coherent_dma_mask) | |
281 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); | |
282 | ||
283 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { | |
284 | ret = mxs_pcm_preallocate_dma_buffer(pcm, | |
285 | SNDRV_PCM_STREAM_PLAYBACK); | |
286 | if (ret) | |
287 | goto out; | |
288 | } | |
289 | ||
290 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { | |
291 | ret = mxs_pcm_preallocate_dma_buffer(pcm, | |
292 | SNDRV_PCM_STREAM_CAPTURE); | |
293 | if (ret) | |
294 | goto out; | |
295 | } | |
296 | ||
297 | out: | |
298 | return ret; | |
299 | } | |
300 | ||
301 | static void mxs_pcm_free(struct snd_pcm *pcm) | |
302 | { | |
303 | struct snd_pcm_substream *substream; | |
304 | struct snd_dma_buffer *buf; | |
305 | int stream; | |
306 | ||
307 | for (stream = 0; stream < 2; stream++) { | |
308 | substream = pcm->streams[stream].substream; | |
309 | if (!substream) | |
310 | continue; | |
311 | ||
312 | buf = &substream->dma_buffer; | |
313 | if (!buf->area) | |
314 | continue; | |
315 | ||
316 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
317 | buf->area, buf->addr); | |
318 | buf->area = NULL; | |
319 | } | |
320 | } | |
321 | ||
322 | static struct snd_soc_platform_driver mxs_soc_platform = { | |
323 | .ops = &mxs_pcm_ops, | |
324 | .pcm_new = mxs_pcm_new, | |
325 | .pcm_free = mxs_pcm_free, | |
326 | }; | |
327 | ||
328 | static int __devinit mxs_soc_platform_probe(struct platform_device *pdev) | |
329 | { | |
330 | return snd_soc_register_platform(&pdev->dev, &mxs_soc_platform); | |
331 | } | |
332 | ||
333 | static int __devexit mxs_soc_platform_remove(struct platform_device *pdev) | |
334 | { | |
335 | snd_soc_unregister_platform(&pdev->dev); | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | static struct platform_driver mxs_pcm_driver = { | |
341 | .driver = { | |
342 | .name = "mxs-pcm-audio", | |
343 | .owner = THIS_MODULE, | |
344 | }, | |
345 | .probe = mxs_soc_platform_probe, | |
346 | .remove = __devexit_p(mxs_soc_platform_remove), | |
347 | }; | |
348 | ||
349 | static int __init snd_mxs_pcm_init(void) | |
350 | { | |
351 | return platform_driver_register(&mxs_pcm_driver); | |
352 | } | |
353 | module_init(snd_mxs_pcm_init); | |
354 | ||
355 | static void __exit snd_mxs_pcm_exit(void) | |
356 | { | |
357 | platform_driver_unregister(&mxs_pcm_driver); | |
358 | } | |
359 | module_exit(snd_mxs_pcm_exit); |