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2e74796a JN |
1 | /* |
2 | * omap-pcm.c -- ALSA PCM interface for the OMAP SoC | |
3 | * | |
4 | * Copyright (C) 2008 Nokia Corporation | |
5 | * | |
b08f7a62 JN |
6 | * Contact: Jarkko Nikula <jhnikula@gmail.com> |
7 | * Peter Ujfalusi <peter.ujfalusi@nokia.com> | |
2e74796a JN |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * version 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
21 | * 02110-1301 USA | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/dma-mapping.h> | |
26 | #include <sound/core.h> | |
27 | #include <sound/pcm.h> | |
28 | #include <sound/pcm_params.h> | |
29 | #include <sound/soc.h> | |
30 | ||
a09e64fb | 31 | #include <mach/dma.h> |
2e74796a JN |
32 | #include "omap-pcm.h" |
33 | ||
34 | static const struct snd_pcm_hardware omap_pcm_hardware = { | |
35 | .info = SNDRV_PCM_INFO_MMAP | | |
36 | SNDRV_PCM_INFO_MMAP_VALID | | |
37 | SNDRV_PCM_INFO_INTERLEAVED | | |
38 | SNDRV_PCM_INFO_PAUSE | | |
39 | SNDRV_PCM_INFO_RESUME, | |
40 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
41 | .period_bytes_min = 32, | |
42 | .period_bytes_max = 64 * 1024, | |
43 | .periods_min = 2, | |
44 | .periods_max = 255, | |
45 | .buffer_bytes_max = 128 * 1024, | |
46 | }; | |
47 | ||
48 | struct omap_runtime_data { | |
49 | spinlock_t lock; | |
50 | struct omap_pcm_dma_data *dma_data; | |
51 | int dma_ch; | |
52 | int period_index; | |
53 | }; | |
54 | ||
55 | static void omap_pcm_dma_irq(int ch, u16 stat, void *data) | |
56 | { | |
57 | struct snd_pcm_substream *substream = data; | |
58 | struct snd_pcm_runtime *runtime = substream->runtime; | |
59 | struct omap_runtime_data *prtd = runtime->private_data; | |
60 | unsigned long flags; | |
61 | ||
62 | if (cpu_is_omap1510()) { | |
63 | /* | |
64 | * OMAP1510 doesn't support DMA chaining so have to restart | |
65 | * the transfer after all periods are transferred | |
66 | */ | |
67 | spin_lock_irqsave(&prtd->lock, flags); | |
68 | if (prtd->period_index >= 0) { | |
69 | if (++prtd->period_index == runtime->periods) { | |
70 | prtd->period_index = 0; | |
71 | omap_start_dma(prtd->dma_ch); | |
72 | } | |
73 | } | |
74 | spin_unlock_irqrestore(&prtd->lock, flags); | |
75 | } | |
76 | ||
77 | snd_pcm_period_elapsed(substream); | |
78 | } | |
79 | ||
80 | /* this may get called several times by oss emulation */ | |
81 | static int omap_pcm_hw_params(struct snd_pcm_substream *substream, | |
82 | struct snd_pcm_hw_params *params) | |
83 | { | |
84 | struct snd_pcm_runtime *runtime = substream->runtime; | |
85 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
86 | struct omap_runtime_data *prtd = runtime->private_data; | |
87 | struct omap_pcm_dma_data *dma_data = rtd->dai->cpu_dai->dma_data; | |
88 | int err = 0; | |
89 | ||
90 | if (!dma_data) | |
91 | return -ENODEV; | |
92 | ||
93 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
94 | runtime->dma_bytes = params_buffer_bytes(params); | |
95 | ||
96 | if (prtd->dma_data) | |
97 | return 0; | |
98 | prtd->dma_data = dma_data; | |
99 | err = omap_request_dma(dma_data->dma_req, dma_data->name, | |
100 | omap_pcm_dma_irq, substream, &prtd->dma_ch); | |
472346da | 101 | if (!err && !cpu_is_omap1510()) { |
2e74796a JN |
102 | /* |
103 | * Link channel with itself so DMA doesn't need any | |
104 | * reprogramming while looping the buffer | |
105 | */ | |
106 | omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch); | |
107 | } | |
108 | ||
109 | return err; | |
110 | } | |
111 | ||
112 | static int omap_pcm_hw_free(struct snd_pcm_substream *substream) | |
113 | { | |
114 | struct snd_pcm_runtime *runtime = substream->runtime; | |
115 | struct omap_runtime_data *prtd = runtime->private_data; | |
116 | ||
117 | if (prtd->dma_data == NULL) | |
118 | return 0; | |
119 | ||
120 | if (!cpu_is_omap1510()) | |
121 | omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch); | |
122 | omap_free_dma(prtd->dma_ch); | |
123 | prtd->dma_data = NULL; | |
124 | ||
125 | snd_pcm_set_runtime_buffer(substream, NULL); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static int omap_pcm_prepare(struct snd_pcm_substream *substream) | |
131 | { | |
132 | struct snd_pcm_runtime *runtime = substream->runtime; | |
133 | struct omap_runtime_data *prtd = runtime->private_data; | |
134 | struct omap_pcm_dma_data *dma_data = prtd->dma_data; | |
135 | struct omap_dma_channel_params dma_params; | |
136 | ||
137 | memset(&dma_params, 0, sizeof(dma_params)); | |
138 | /* | |
139 | * Note: Regardless of interface data formats supported by OMAP McBSP | |
140 | * or EAC blocks, internal representation is always fixed 16-bit/sample | |
141 | */ | |
142 | dma_params.data_type = OMAP_DMA_DATA_TYPE_S16; | |
143 | dma_params.trigger = dma_data->dma_req; | |
144 | dma_params.sync_mode = OMAP_DMA_SYNC_ELEMENT; | |
145 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
146 | dma_params.src_amode = OMAP_DMA_AMODE_POST_INC; | |
147 | dma_params.dst_amode = OMAP_DMA_AMODE_CONSTANT; | |
148 | dma_params.src_or_dst_synch = OMAP_DMA_DST_SYNC; | |
149 | dma_params.src_start = runtime->dma_addr; | |
150 | dma_params.dst_start = dma_data->port_addr; | |
9d37484c | 151 | dma_params.dst_port = OMAP_DMA_PORT_MPUI; |
2e74796a JN |
152 | } else { |
153 | dma_params.src_amode = OMAP_DMA_AMODE_CONSTANT; | |
154 | dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC; | |
155 | dma_params.src_or_dst_synch = OMAP_DMA_SRC_SYNC; | |
156 | dma_params.src_start = dma_data->port_addr; | |
157 | dma_params.dst_start = runtime->dma_addr; | |
9d37484c | 158 | dma_params.src_port = OMAP_DMA_PORT_MPUI; |
2e74796a JN |
159 | } |
160 | /* | |
161 | * Set DMA transfer frame size equal to ALSA period size and frame | |
162 | * count as no. of ALSA periods. Then with DMA frame interrupt enabled, | |
163 | * we can transfer the whole ALSA buffer with single DMA transfer but | |
164 | * still can get an interrupt at each period bounary | |
165 | */ | |
166 | dma_params.elem_count = snd_pcm_lib_period_bytes(substream) / 2; | |
167 | dma_params.frame_count = runtime->periods; | |
168 | omap_set_dma_params(prtd->dma_ch, &dma_params); | |
169 | ||
170 | omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ); | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
176 | { | |
177 | struct snd_pcm_runtime *runtime = substream->runtime; | |
178 | struct omap_runtime_data *prtd = runtime->private_data; | |
21dff434 | 179 | unsigned long flags; |
2e74796a JN |
180 | int ret = 0; |
181 | ||
21dff434 | 182 | spin_lock_irqsave(&prtd->lock, flags); |
2e74796a JN |
183 | switch (cmd) { |
184 | case SNDRV_PCM_TRIGGER_START: | |
185 | case SNDRV_PCM_TRIGGER_RESUME: | |
186 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
187 | prtd->period_index = 0; | |
188 | omap_start_dma(prtd->dma_ch); | |
189 | break; | |
190 | ||
191 | case SNDRV_PCM_TRIGGER_STOP: | |
192 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
193 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
194 | prtd->period_index = -1; | |
195 | omap_stop_dma(prtd->dma_ch); | |
196 | break; | |
197 | default: | |
198 | ret = -EINVAL; | |
199 | } | |
21dff434 | 200 | spin_unlock_irqrestore(&prtd->lock, flags); |
2e74796a JN |
201 | |
202 | return ret; | |
203 | } | |
204 | ||
205 | static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream) | |
206 | { | |
207 | struct snd_pcm_runtime *runtime = substream->runtime; | |
208 | struct omap_runtime_data *prtd = runtime->private_data; | |
209 | dma_addr_t ptr; | |
210 | snd_pcm_uframes_t offset; | |
211 | ||
212 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
213 | ptr = omap_get_dma_src_pos(prtd->dma_ch); | |
214 | else | |
215 | ptr = omap_get_dma_dst_pos(prtd->dma_ch); | |
216 | ||
217 | offset = bytes_to_frames(runtime, ptr - runtime->dma_addr); | |
218 | if (offset >= runtime->buffer_size) | |
219 | offset = 0; | |
220 | ||
221 | return offset; | |
222 | } | |
223 | ||
224 | static int omap_pcm_open(struct snd_pcm_substream *substream) | |
225 | { | |
226 | struct snd_pcm_runtime *runtime = substream->runtime; | |
227 | struct omap_runtime_data *prtd; | |
228 | int ret; | |
229 | ||
230 | snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware); | |
231 | ||
232 | /* Ensure that buffer size is a multiple of period size */ | |
233 | ret = snd_pcm_hw_constraint_integer(runtime, | |
234 | SNDRV_PCM_HW_PARAM_PERIODS); | |
235 | if (ret < 0) | |
236 | goto out; | |
237 | ||
19b3f316 | 238 | prtd = kzalloc(sizeof(*prtd), GFP_KERNEL); |
2e74796a JN |
239 | if (prtd == NULL) { |
240 | ret = -ENOMEM; | |
241 | goto out; | |
242 | } | |
243 | spin_lock_init(&prtd->lock); | |
244 | runtime->private_data = prtd; | |
245 | ||
246 | out: | |
247 | return ret; | |
248 | } | |
249 | ||
250 | static int omap_pcm_close(struct snd_pcm_substream *substream) | |
251 | { | |
252 | struct snd_pcm_runtime *runtime = substream->runtime; | |
253 | ||
254 | kfree(runtime->private_data); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | static int omap_pcm_mmap(struct snd_pcm_substream *substream, | |
259 | struct vm_area_struct *vma) | |
260 | { | |
261 | struct snd_pcm_runtime *runtime = substream->runtime; | |
262 | ||
263 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
264 | runtime->dma_area, | |
265 | runtime->dma_addr, | |
266 | runtime->dma_bytes); | |
267 | } | |
268 | ||
b2a19d02 | 269 | static struct snd_pcm_ops omap_pcm_ops = { |
2e74796a JN |
270 | .open = omap_pcm_open, |
271 | .close = omap_pcm_close, | |
272 | .ioctl = snd_pcm_lib_ioctl, | |
273 | .hw_params = omap_pcm_hw_params, | |
274 | .hw_free = omap_pcm_hw_free, | |
275 | .prepare = omap_pcm_prepare, | |
276 | .trigger = omap_pcm_trigger, | |
277 | .pointer = omap_pcm_pointer, | |
278 | .mmap = omap_pcm_mmap, | |
279 | }; | |
280 | ||
281 | static u64 omap_pcm_dmamask = DMA_BIT_MASK(32); | |
282 | ||
283 | static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, | |
284 | int stream) | |
285 | { | |
286 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
287 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
288 | size_t size = omap_pcm_hardware.buffer_bytes_max; | |
289 | ||
290 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
291 | buf->dev.dev = pcm->card->dev; | |
292 | buf->private_data = NULL; | |
293 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
294 | &buf->addr, GFP_KERNEL); | |
295 | if (!buf->area) | |
296 | return -ENOMEM; | |
297 | ||
298 | buf->bytes = size; | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
303 | { | |
304 | struct snd_pcm_substream *substream; | |
305 | struct snd_dma_buffer *buf; | |
306 | int stream; | |
307 | ||
308 | for (stream = 0; stream < 2; stream++) { | |
309 | substream = pcm->streams[stream].substream; | |
310 | if (!substream) | |
311 | continue; | |
312 | ||
313 | buf = &substream->dma_buffer; | |
314 | if (!buf->area) | |
315 | continue; | |
316 | ||
317 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
318 | buf->area, buf->addr); | |
319 | buf->area = NULL; | |
320 | } | |
321 | } | |
322 | ||
8687eb8b | 323 | int omap_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, |
2e74796a JN |
324 | struct snd_pcm *pcm) |
325 | { | |
326 | int ret = 0; | |
327 | ||
328 | if (!card->dev->dma_mask) | |
329 | card->dev->dma_mask = &omap_pcm_dmamask; | |
330 | if (!card->dev->coherent_dma_mask) | |
284901a9 | 331 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); |
2e74796a JN |
332 | |
333 | if (dai->playback.channels_min) { | |
334 | ret = omap_pcm_preallocate_dma_buffer(pcm, | |
335 | SNDRV_PCM_STREAM_PLAYBACK); | |
336 | if (ret) | |
337 | goto out; | |
338 | } | |
339 | ||
340 | if (dai->capture.channels_min) { | |
341 | ret = omap_pcm_preallocate_dma_buffer(pcm, | |
342 | SNDRV_PCM_STREAM_CAPTURE); | |
343 | if (ret) | |
344 | goto out; | |
345 | } | |
346 | ||
347 | out: | |
348 | return ret; | |
349 | } | |
350 | ||
351 | struct snd_soc_platform omap_soc_platform = { | |
352 | .name = "omap-pcm-audio", | |
353 | .pcm_ops = &omap_pcm_ops, | |
354 | .pcm_new = omap_pcm_new, | |
355 | .pcm_free = omap_pcm_free_dma_buffers, | |
356 | }; | |
357 | EXPORT_SYMBOL_GPL(omap_soc_platform); | |
358 | ||
c9b3a40f | 359 | static int __init omap_soc_platform_init(void) |
958e792c MB |
360 | { |
361 | return snd_soc_register_platform(&omap_soc_platform); | |
362 | } | |
363 | module_init(omap_soc_platform_init); | |
364 | ||
365 | static void __exit omap_soc_platform_exit(void) | |
366 | { | |
367 | snd_soc_unregister_platform(&omap_soc_platform); | |
368 | } | |
369 | module_exit(omap_soc_platform_exit); | |
370 | ||
b08f7a62 | 371 | MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>"); |
2e74796a JN |
372 | MODULE_DESCRIPTION("OMAP PCM DMA module"); |
373 | MODULE_LICENSE("GPL"); |