2 * omap-pcm.c -- ALSA PCM interface for the OMAP SoC
4 * Copyright (C) 2008 Nokia Corporation
6 * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
7 * Peter Ujfalusi <peter.ujfalusi@ti.com>
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.
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.
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
25 #include <linux/dma-mapping.h>
26 #include <linux/slab.h>
27 #include <sound/core.h>
28 #include <sound/pcm.h>
29 #include <sound/pcm_params.h>
30 #include <sound/soc.h>
35 static const struct snd_pcm_hardware omap_pcm_hardware = {
36 .info = SNDRV_PCM_INFO_MMAP |
37 SNDRV_PCM_INFO_MMAP_VALID |
38 SNDRV_PCM_INFO_INTERLEAVED |
39 SNDRV_PCM_INFO_PAUSE |
40 SNDRV_PCM_INFO_RESUME |
41 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
42 .formats = SNDRV_PCM_FMTBIT_S16_LE |
43 SNDRV_PCM_FMTBIT_S32_LE,
44 .period_bytes_min = 32,
45 .period_bytes_max = 64 * 1024,
48 .buffer_bytes_max = 128 * 1024,
51 struct omap_runtime_data {
53 struct omap_pcm_dma_data *dma_data;
58 static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
60 struct snd_pcm_substream *substream = data;
61 struct snd_pcm_runtime *runtime = substream->runtime;
62 struct omap_runtime_data *prtd = runtime->private_data;
65 if ((cpu_is_omap1510())) {
67 * OMAP1510 doesn't fully support DMA progress counter
68 * and there is no software emulation implemented yet,
69 * so have to maintain our own progress counters
70 * that can be used by omap_pcm_pointer() instead.
72 spin_lock_irqsave(&prtd->lock, flags);
73 if ((stat == OMAP_DMA_LAST_IRQ) &&
74 (prtd->period_index == runtime->periods - 1)) {
75 /* we are in sync, do nothing */
76 spin_unlock_irqrestore(&prtd->lock, flags);
79 if (prtd->period_index >= 0) {
80 if (stat & OMAP_DMA_BLOCK_IRQ) {
81 /* end of buffer reached, loop back */
82 prtd->period_index = 0;
83 } else if (stat & OMAP_DMA_LAST_IRQ) {
84 /* update the counter for the last period */
85 prtd->period_index = runtime->periods - 1;
86 } else if (++prtd->period_index >= runtime->periods) {
87 /* end of buffer missed? loop back */
88 prtd->period_index = 0;
91 spin_unlock_irqrestore(&prtd->lock, flags);
94 snd_pcm_period_elapsed(substream);
97 /* this may get called several times by oss emulation */
98 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
99 struct snd_pcm_hw_params *params)
101 struct snd_pcm_runtime *runtime = substream->runtime;
102 struct snd_soc_pcm_runtime *rtd = substream->private_data;
103 struct omap_runtime_data *prtd = runtime->private_data;
104 struct omap_pcm_dma_data *dma_data;
108 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
110 /* return if this is a bufferless transfer e.g.
111 * codec <--> BT codec or GSM modem -- lg FIXME */
115 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
116 runtime->dma_bytes = params_buffer_bytes(params);
120 prtd->dma_data = dma_data;
121 err = omap_request_dma(dma_data->dma_req, dma_data->name,
122 omap_pcm_dma_irq, substream, &prtd->dma_ch);
125 * Link channel with itself so DMA doesn't need any
126 * reprogramming while looping the buffer
128 omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
134 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
136 struct snd_pcm_runtime *runtime = substream->runtime;
137 struct omap_runtime_data *prtd = runtime->private_data;
139 if (prtd->dma_data == NULL)
142 omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
143 omap_free_dma(prtd->dma_ch);
144 prtd->dma_data = NULL;
146 snd_pcm_set_runtime_buffer(substream, NULL);
151 static int omap_pcm_prepare(struct snd_pcm_substream *substream)
153 struct snd_pcm_runtime *runtime = substream->runtime;
154 struct omap_runtime_data *prtd = runtime->private_data;
155 struct omap_pcm_dma_data *dma_data = prtd->dma_data;
156 struct omap_dma_channel_params dma_params;
159 /* return if this is a bufferless transfer e.g.
160 * codec <--> BT codec or GSM modem -- lg FIXME */
164 memset(&dma_params, 0, sizeof(dma_params));
165 dma_params.data_type = dma_data->data_type;
166 dma_params.trigger = dma_data->dma_req;
167 dma_params.sync_mode = dma_data->sync_mode;
168 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
169 dma_params.src_amode = OMAP_DMA_AMODE_POST_INC;
170 dma_params.dst_amode = OMAP_DMA_AMODE_CONSTANT;
171 dma_params.src_or_dst_synch = OMAP_DMA_DST_SYNC;
172 dma_params.src_start = runtime->dma_addr;
173 dma_params.dst_start = dma_data->port_addr;
174 dma_params.dst_port = OMAP_DMA_PORT_MPUI;
175 dma_params.dst_fi = dma_data->packet_size;
177 dma_params.src_amode = OMAP_DMA_AMODE_CONSTANT;
178 dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC;
179 dma_params.src_or_dst_synch = OMAP_DMA_SRC_SYNC;
180 dma_params.src_start = dma_data->port_addr;
181 dma_params.dst_start = runtime->dma_addr;
182 dma_params.src_port = OMAP_DMA_PORT_MPUI;
183 dma_params.src_fi = dma_data->packet_size;
186 * Set DMA transfer frame size equal to ALSA period size and frame
187 * count as no. of ALSA periods. Then with DMA frame interrupt enabled,
188 * we can transfer the whole ALSA buffer with single DMA transfer but
189 * still can get an interrupt at each period bounary
191 bytes = snd_pcm_lib_period_bytes(substream);
192 dma_params.elem_count = bytes >> dma_data->data_type;
193 dma_params.frame_count = runtime->periods;
194 omap_set_dma_params(prtd->dma_ch, &dma_params);
196 if ((cpu_is_omap1510()))
197 omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ |
198 OMAP_DMA_LAST_IRQ | OMAP_DMA_BLOCK_IRQ);
199 else if (!substream->runtime->no_period_wakeup)
200 omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
204 * we need to disable BLOCK_IRQ, which is enabled by the omap
205 * dma core at request dma time.
207 omap_disable_dma_irq(prtd->dma_ch, OMAP_DMA_BLOCK_IRQ);
210 if (!(cpu_class_is_omap1())) {
211 omap_set_dma_src_burst_mode(prtd->dma_ch,
212 OMAP_DMA_DATA_BURST_16);
213 omap_set_dma_dest_burst_mode(prtd->dma_ch,
214 OMAP_DMA_DATA_BURST_16);
220 static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
222 struct snd_pcm_runtime *runtime = substream->runtime;
223 struct omap_runtime_data *prtd = runtime->private_data;
224 struct omap_pcm_dma_data *dma_data = prtd->dma_data;
228 spin_lock_irqsave(&prtd->lock, flags);
230 case SNDRV_PCM_TRIGGER_START:
231 case SNDRV_PCM_TRIGGER_RESUME:
232 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
233 prtd->period_index = 0;
234 /* Configure McBSP internal buffer usage */
235 if (dma_data->set_threshold)
236 dma_data->set_threshold(substream);
238 omap_start_dma(prtd->dma_ch);
241 case SNDRV_PCM_TRIGGER_STOP:
242 case SNDRV_PCM_TRIGGER_SUSPEND:
243 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
244 prtd->period_index = -1;
245 omap_stop_dma(prtd->dma_ch);
250 spin_unlock_irqrestore(&prtd->lock, flags);
255 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
257 struct snd_pcm_runtime *runtime = substream->runtime;
258 struct omap_runtime_data *prtd = runtime->private_data;
260 snd_pcm_uframes_t offset;
262 if (cpu_is_omap1510()) {
263 offset = prtd->period_index * runtime->period_size;
264 } else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
265 ptr = omap_get_dma_dst_pos(prtd->dma_ch);
266 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
268 ptr = omap_get_dma_src_pos(prtd->dma_ch);
269 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
272 if (offset >= runtime->buffer_size)
278 static int omap_pcm_open(struct snd_pcm_substream *substream)
280 struct snd_pcm_runtime *runtime = substream->runtime;
281 struct omap_runtime_data *prtd;
284 snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
286 /* Ensure that buffer size is a multiple of period size */
287 ret = snd_pcm_hw_constraint_integer(runtime,
288 SNDRV_PCM_HW_PARAM_PERIODS);
292 prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
297 spin_lock_init(&prtd->lock);
298 runtime->private_data = prtd;
304 static int omap_pcm_close(struct snd_pcm_substream *substream)
306 struct snd_pcm_runtime *runtime = substream->runtime;
308 kfree(runtime->private_data);
312 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
313 struct vm_area_struct *vma)
315 struct snd_pcm_runtime *runtime = substream->runtime;
317 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
323 static struct snd_pcm_ops omap_pcm_ops = {
324 .open = omap_pcm_open,
325 .close = omap_pcm_close,
326 .ioctl = snd_pcm_lib_ioctl,
327 .hw_params = omap_pcm_hw_params,
328 .hw_free = omap_pcm_hw_free,
329 .prepare = omap_pcm_prepare,
330 .trigger = omap_pcm_trigger,
331 .pointer = omap_pcm_pointer,
332 .mmap = omap_pcm_mmap,
335 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
337 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
340 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
341 struct snd_dma_buffer *buf = &substream->dma_buffer;
342 size_t size = omap_pcm_hardware.buffer_bytes_max;
344 buf->dev.type = SNDRV_DMA_TYPE_DEV;
345 buf->dev.dev = pcm->card->dev;
346 buf->private_data = NULL;
347 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
348 &buf->addr, GFP_KERNEL);
356 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
358 struct snd_pcm_substream *substream;
359 struct snd_dma_buffer *buf;
362 for (stream = 0; stream < 2; stream++) {
363 substream = pcm->streams[stream].substream;
367 buf = &substream->dma_buffer;
371 dma_free_writecombine(pcm->card->dev, buf->bytes,
372 buf->area, buf->addr);
377 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
379 struct snd_card *card = rtd->card->snd_card;
380 struct snd_soc_dai *dai = rtd->cpu_dai;
381 struct snd_pcm *pcm = rtd->pcm;
384 if (!card->dev->dma_mask)
385 card->dev->dma_mask = &omap_pcm_dmamask;
386 if (!card->dev->coherent_dma_mask)
387 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
389 if (dai->driver->playback.channels_min) {
390 ret = omap_pcm_preallocate_dma_buffer(pcm,
391 SNDRV_PCM_STREAM_PLAYBACK);
396 if (dai->driver->capture.channels_min) {
397 ret = omap_pcm_preallocate_dma_buffer(pcm,
398 SNDRV_PCM_STREAM_CAPTURE);
407 static struct snd_soc_platform_driver omap_soc_platform = {
408 .ops = &omap_pcm_ops,
409 .pcm_new = omap_pcm_new,
410 .pcm_free = omap_pcm_free_dma_buffers,
413 static __devinit int omap_pcm_probe(struct platform_device *pdev)
415 return snd_soc_register_platform(&pdev->dev,
419 static int __devexit omap_pcm_remove(struct platform_device *pdev)
421 snd_soc_unregister_platform(&pdev->dev);
425 static struct platform_driver omap_pcm_driver = {
427 .name = "omap-pcm-audio",
428 .owner = THIS_MODULE,
431 .probe = omap_pcm_probe,
432 .remove = __devexit_p(omap_pcm_remove),
435 static int __init snd_omap_pcm_init(void)
437 return platform_driver_register(&omap_pcm_driver);
439 module_init(snd_omap_pcm_init);
441 static void __exit snd_omap_pcm_exit(void)
443 platform_driver_unregister(&omap_pcm_driver);
445 module_exit(snd_omap_pcm_exit);
447 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
448 MODULE_DESCRIPTION("OMAP PCM DMA module");
449 MODULE_LICENSE("GPL");