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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 | * | |
6 | * Contact: Jarkko Nikula <jarkko.nikula@nokia.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * version 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
20 | * 02110-1301 USA | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/dma-mapping.h> | |
25 | #include <sound/core.h> | |
26 | #include <sound/pcm.h> | |
27 | #include <sound/pcm_params.h> | |
28 | #include <sound/soc.h> | |
29 | ||
a09e64fb | 30 | #include <mach/dma.h> |
2e74796a JN |
31 | #include "omap-pcm.h" |
32 | ||
33 | static const struct snd_pcm_hardware omap_pcm_hardware = { | |
34 | .info = SNDRV_PCM_INFO_MMAP | | |
35 | SNDRV_PCM_INFO_MMAP_VALID | | |
36 | SNDRV_PCM_INFO_INTERLEAVED | | |
37 | SNDRV_PCM_INFO_PAUSE | | |
38 | SNDRV_PCM_INFO_RESUME, | |
39 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
40 | .period_bytes_min = 32, | |
41 | .period_bytes_max = 64 * 1024, | |
42 | .periods_min = 2, | |
43 | .periods_max = 255, | |
44 | .buffer_bytes_max = 128 * 1024, | |
45 | }; | |
46 | ||
47 | struct omap_runtime_data { | |
48 | spinlock_t lock; | |
49 | struct omap_pcm_dma_data *dma_data; | |
50 | int dma_ch; | |
51 | int period_index; | |
52 | }; | |
53 | ||
54 | static void omap_pcm_dma_irq(int ch, u16 stat, void *data) | |
55 | { | |
56 | struct snd_pcm_substream *substream = data; | |
57 | struct snd_pcm_runtime *runtime = substream->runtime; | |
58 | struct omap_runtime_data *prtd = runtime->private_data; | |
59 | unsigned long flags; | |
60 | ||
61 | if (cpu_is_omap1510()) { | |
62 | /* | |
63 | * OMAP1510 doesn't support DMA chaining so have to restart | |
64 | * the transfer after all periods are transferred | |
65 | */ | |
66 | spin_lock_irqsave(&prtd->lock, flags); | |
67 | if (prtd->period_index >= 0) { | |
68 | if (++prtd->period_index == runtime->periods) { | |
69 | prtd->period_index = 0; | |
70 | omap_start_dma(prtd->dma_ch); | |
71 | } | |
72 | } | |
73 | spin_unlock_irqrestore(&prtd->lock, flags); | |
74 | } | |
75 | ||
76 | snd_pcm_period_elapsed(substream); | |
77 | } | |
78 | ||
79 | /* this may get called several times by oss emulation */ | |
80 | static int omap_pcm_hw_params(struct snd_pcm_substream *substream, | |
81 | struct snd_pcm_hw_params *params) | |
82 | { | |
83 | struct snd_pcm_runtime *runtime = substream->runtime; | |
84 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
85 | struct omap_runtime_data *prtd = runtime->private_data; | |
86 | struct omap_pcm_dma_data *dma_data = rtd->dai->cpu_dai->dma_data; | |
87 | int err = 0; | |
88 | ||
89 | if (!dma_data) | |
90 | return -ENODEV; | |
91 | ||
92 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
93 | runtime->dma_bytes = params_buffer_bytes(params); | |
94 | ||
95 | if (prtd->dma_data) | |
96 | return 0; | |
97 | prtd->dma_data = dma_data; | |
98 | err = omap_request_dma(dma_data->dma_req, dma_data->name, | |
99 | omap_pcm_dma_irq, substream, &prtd->dma_ch); | |
9d37484c | 100 | if (!err & !cpu_is_omap1510()) { |
2e74796a JN |
101 | /* |
102 | * Link channel with itself so DMA doesn't need any | |
103 | * reprogramming while looping the buffer | |
104 | */ | |
105 | omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch); | |
106 | } | |
107 | ||
108 | return err; | |
109 | } | |
110 | ||
111 | static int omap_pcm_hw_free(struct snd_pcm_substream *substream) | |
112 | { | |
113 | struct snd_pcm_runtime *runtime = substream->runtime; | |
114 | struct omap_runtime_data *prtd = runtime->private_data; | |
115 | ||
116 | if (prtd->dma_data == NULL) | |
117 | return 0; | |
118 | ||
119 | if (!cpu_is_omap1510()) | |
120 | omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch); | |
121 | omap_free_dma(prtd->dma_ch); | |
122 | prtd->dma_data = NULL; | |
123 | ||
124 | snd_pcm_set_runtime_buffer(substream, NULL); | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static int omap_pcm_prepare(struct snd_pcm_substream *substream) | |
130 | { | |
131 | struct snd_pcm_runtime *runtime = substream->runtime; | |
132 | struct omap_runtime_data *prtd = runtime->private_data; | |
133 | struct omap_pcm_dma_data *dma_data = prtd->dma_data; | |
134 | struct omap_dma_channel_params dma_params; | |
135 | ||
136 | memset(&dma_params, 0, sizeof(dma_params)); | |
137 | /* | |
138 | * Note: Regardless of interface data formats supported by OMAP McBSP | |
139 | * or EAC blocks, internal representation is always fixed 16-bit/sample | |
140 | */ | |
141 | dma_params.data_type = OMAP_DMA_DATA_TYPE_S16; | |
142 | dma_params.trigger = dma_data->dma_req; | |
143 | dma_params.sync_mode = OMAP_DMA_SYNC_ELEMENT; | |
144 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
145 | dma_params.src_amode = OMAP_DMA_AMODE_POST_INC; | |
146 | dma_params.dst_amode = OMAP_DMA_AMODE_CONSTANT; | |
147 | dma_params.src_or_dst_synch = OMAP_DMA_DST_SYNC; | |
148 | dma_params.src_start = runtime->dma_addr; | |
149 | dma_params.dst_start = dma_data->port_addr; | |
9d37484c | 150 | dma_params.dst_port = OMAP_DMA_PORT_MPUI; |
2e74796a JN |
151 | } else { |
152 | dma_params.src_amode = OMAP_DMA_AMODE_CONSTANT; | |
153 | dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC; | |
154 | dma_params.src_or_dst_synch = OMAP_DMA_SRC_SYNC; | |
155 | dma_params.src_start = dma_data->port_addr; | |
156 | dma_params.dst_start = runtime->dma_addr; | |
9d37484c | 157 | dma_params.src_port = OMAP_DMA_PORT_MPUI; |
2e74796a JN |
158 | } |
159 | /* | |
160 | * Set DMA transfer frame size equal to ALSA period size and frame | |
161 | * count as no. of ALSA periods. Then with DMA frame interrupt enabled, | |
162 | * we can transfer the whole ALSA buffer with single DMA transfer but | |
163 | * still can get an interrupt at each period bounary | |
164 | */ | |
165 | dma_params.elem_count = snd_pcm_lib_period_bytes(substream) / 2; | |
166 | dma_params.frame_count = runtime->periods; | |
167 | omap_set_dma_params(prtd->dma_ch, &dma_params); | |
168 | ||
169 | omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ); | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
175 | { | |
176 | struct snd_pcm_runtime *runtime = substream->runtime; | |
177 | struct omap_runtime_data *prtd = runtime->private_data; | |
178 | int ret = 0; | |
179 | ||
180 | spin_lock_irq(&prtd->lock); | |
181 | switch (cmd) { | |
182 | case SNDRV_PCM_TRIGGER_START: | |
183 | case SNDRV_PCM_TRIGGER_RESUME: | |
184 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
185 | prtd->period_index = 0; | |
186 | omap_start_dma(prtd->dma_ch); | |
187 | break; | |
188 | ||
189 | case SNDRV_PCM_TRIGGER_STOP: | |
190 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
191 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
192 | prtd->period_index = -1; | |
193 | omap_stop_dma(prtd->dma_ch); | |
194 | break; | |
195 | default: | |
196 | ret = -EINVAL; | |
197 | } | |
198 | spin_unlock_irq(&prtd->lock); | |
199 | ||
200 | return ret; | |
201 | } | |
202 | ||
203 | static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream) | |
204 | { | |
205 | struct snd_pcm_runtime *runtime = substream->runtime; | |
206 | struct omap_runtime_data *prtd = runtime->private_data; | |
207 | dma_addr_t ptr; | |
208 | snd_pcm_uframes_t offset; | |
209 | ||
210 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
211 | ptr = omap_get_dma_src_pos(prtd->dma_ch); | |
212 | else | |
213 | ptr = omap_get_dma_dst_pos(prtd->dma_ch); | |
214 | ||
215 | offset = bytes_to_frames(runtime, ptr - runtime->dma_addr); | |
216 | if (offset >= runtime->buffer_size) | |
217 | offset = 0; | |
218 | ||
219 | return offset; | |
220 | } | |
221 | ||
222 | static int omap_pcm_open(struct snd_pcm_substream *substream) | |
223 | { | |
224 | struct snd_pcm_runtime *runtime = substream->runtime; | |
225 | struct omap_runtime_data *prtd; | |
226 | int ret; | |
227 | ||
228 | snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware); | |
229 | ||
230 | /* Ensure that buffer size is a multiple of period size */ | |
231 | ret = snd_pcm_hw_constraint_integer(runtime, | |
232 | SNDRV_PCM_HW_PARAM_PERIODS); | |
233 | if (ret < 0) | |
234 | goto out; | |
235 | ||
236 | prtd = kzalloc(sizeof(prtd), GFP_KERNEL); | |
237 | if (prtd == NULL) { | |
238 | ret = -ENOMEM; | |
239 | goto out; | |
240 | } | |
241 | spin_lock_init(&prtd->lock); | |
242 | runtime->private_data = prtd; | |
243 | ||
244 | out: | |
245 | return ret; | |
246 | } | |
247 | ||
248 | static int omap_pcm_close(struct snd_pcm_substream *substream) | |
249 | { | |
250 | struct snd_pcm_runtime *runtime = substream->runtime; | |
251 | ||
252 | kfree(runtime->private_data); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | static int omap_pcm_mmap(struct snd_pcm_substream *substream, | |
257 | struct vm_area_struct *vma) | |
258 | { | |
259 | struct snd_pcm_runtime *runtime = substream->runtime; | |
260 | ||
261 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
262 | runtime->dma_area, | |
263 | runtime->dma_addr, | |
264 | runtime->dma_bytes); | |
265 | } | |
266 | ||
267 | struct snd_pcm_ops omap_pcm_ops = { | |
268 | .open = omap_pcm_open, | |
269 | .close = omap_pcm_close, | |
270 | .ioctl = snd_pcm_lib_ioctl, | |
271 | .hw_params = omap_pcm_hw_params, | |
272 | .hw_free = omap_pcm_hw_free, | |
273 | .prepare = omap_pcm_prepare, | |
274 | .trigger = omap_pcm_trigger, | |
275 | .pointer = omap_pcm_pointer, | |
276 | .mmap = omap_pcm_mmap, | |
277 | }; | |
278 | ||
279 | static u64 omap_pcm_dmamask = DMA_BIT_MASK(32); | |
280 | ||
281 | static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, | |
282 | int stream) | |
283 | { | |
284 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
285 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
286 | size_t size = omap_pcm_hardware.buffer_bytes_max; | |
287 | ||
288 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
289 | buf->dev.dev = pcm->card->dev; | |
290 | buf->private_data = NULL; | |
291 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
292 | &buf->addr, GFP_KERNEL); | |
293 | if (!buf->area) | |
294 | return -ENOMEM; | |
295 | ||
296 | buf->bytes = size; | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
301 | { | |
302 | struct snd_pcm_substream *substream; | |
303 | struct snd_dma_buffer *buf; | |
304 | int stream; | |
305 | ||
306 | for (stream = 0; stream < 2; stream++) { | |
307 | substream = pcm->streams[stream].substream; | |
308 | if (!substream) | |
309 | continue; | |
310 | ||
311 | buf = &substream->dma_buffer; | |
312 | if (!buf->area) | |
313 | continue; | |
314 | ||
315 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
316 | buf->area, buf->addr); | |
317 | buf->area = NULL; | |
318 | } | |
319 | } | |
320 | ||
8687eb8b | 321 | int omap_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, |
2e74796a JN |
322 | struct snd_pcm *pcm) |
323 | { | |
324 | int ret = 0; | |
325 | ||
326 | if (!card->dev->dma_mask) | |
327 | card->dev->dma_mask = &omap_pcm_dmamask; | |
328 | if (!card->dev->coherent_dma_mask) | |
329 | card->dev->coherent_dma_mask = DMA_32BIT_MASK; | |
330 | ||
331 | if (dai->playback.channels_min) { | |
332 | ret = omap_pcm_preallocate_dma_buffer(pcm, | |
333 | SNDRV_PCM_STREAM_PLAYBACK); | |
334 | if (ret) | |
335 | goto out; | |
336 | } | |
337 | ||
338 | if (dai->capture.channels_min) { | |
339 | ret = omap_pcm_preallocate_dma_buffer(pcm, | |
340 | SNDRV_PCM_STREAM_CAPTURE); | |
341 | if (ret) | |
342 | goto out; | |
343 | } | |
344 | ||
345 | out: | |
346 | return ret; | |
347 | } | |
348 | ||
349 | struct snd_soc_platform omap_soc_platform = { | |
350 | .name = "omap-pcm-audio", | |
351 | .pcm_ops = &omap_pcm_ops, | |
352 | .pcm_new = omap_pcm_new, | |
353 | .pcm_free = omap_pcm_free_dma_buffers, | |
354 | }; | |
355 | EXPORT_SYMBOL_GPL(omap_soc_platform); | |
356 | ||
c9b3a40f | 357 | static int __init omap_soc_platform_init(void) |
958e792c MB |
358 | { |
359 | return snd_soc_register_platform(&omap_soc_platform); | |
360 | } | |
361 | module_init(omap_soc_platform_init); | |
362 | ||
363 | static void __exit omap_soc_platform_exit(void) | |
364 | { | |
365 | snd_soc_unregister_platform(&omap_soc_platform); | |
366 | } | |
367 | module_exit(omap_soc_platform_exit); | |
368 | ||
2e74796a JN |
369 | MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@nokia.com>"); |
370 | MODULE_DESCRIPTION("OMAP PCM DMA module"); | |
371 | MODULE_LICENSE("GPL"); |