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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@bitmer.com>
7 * Peter Ujfalusi <peter.ujfalusi@ti.com>
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 <linux/slab.h>
27#include <sound/core.h>
28#include <sound/pcm.h>
29#include <sound/pcm_params.h>
30#include <sound/soc.h>
31
32#include <plat/dma.h>
33#include "omap-pcm.h"
34
35static 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,
46 .periods_min = 2,
47 .periods_max = 255,
48 .buffer_bytes_max = 128 * 1024,
49};
50
51struct omap_runtime_data {
52 spinlock_t lock;
53 struct omap_pcm_dma_data *dma_data;
54 int dma_ch;
55 int period_index;
56};
57
58static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
59{
60 struct snd_pcm_substream *substream = data;
61 struct snd_pcm_runtime *runtime = substream->runtime;
62 struct omap_runtime_data *prtd = runtime->private_data;
63 unsigned long flags;
64
65 if ((cpu_is_omap1510())) {
66 /*
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.
71 */
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);
77 return;
78 }
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;
89 }
90 }
91 spin_unlock_irqrestore(&prtd->lock, flags);
92 }
93
94 snd_pcm_period_elapsed(substream);
95}
96
97/* this may get called several times by oss emulation */
98static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
99 struct snd_pcm_hw_params *params)
100{
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;
105
106 int err = 0;
107
108 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
109
110 /* return if this is a bufferless transfer e.g.
111 * codec <--> BT codec or GSM modem -- lg FIXME */
112 if (!dma_data)
113 return 0;
114
115 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
116 runtime->dma_bytes = params_buffer_bytes(params);
117
118 if (prtd->dma_data)
119 return 0;
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);
123 if (!err) {
124 /*
125 * Link channel with itself so DMA doesn't need any
126 * reprogramming while looping the buffer
127 */
128 omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
129 }
130
131 return err;
132}
133
134static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
135{
136 struct snd_pcm_runtime *runtime = substream->runtime;
137 struct omap_runtime_data *prtd = runtime->private_data;
138
139 if (prtd->dma_data == NULL)
140 return 0;
141
142 omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
143 omap_free_dma(prtd->dma_ch);
144 prtd->dma_data = NULL;
145
146 snd_pcm_set_runtime_buffer(substream, NULL);
147
148 return 0;
149}
150
151static int omap_pcm_prepare(struct snd_pcm_substream *substream)
152{
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;
157 int bytes;
158
159 /* return if this is a bufferless transfer e.g.
160 * codec <--> BT codec or GSM modem -- lg FIXME */
161 if (!prtd->dma_data)
162 return 0;
163
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;
176 } else {
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;
184 }
185 /*
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
190 */
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);
195
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);
201
202 if (!(cpu_class_is_omap1())) {
203 omap_set_dma_src_burst_mode(prtd->dma_ch,
204 OMAP_DMA_DATA_BURST_16);
205 omap_set_dma_dest_burst_mode(prtd->dma_ch,
206 OMAP_DMA_DATA_BURST_16);
207 }
208
209 return 0;
210}
211
212static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
213{
214 struct snd_pcm_runtime *runtime = substream->runtime;
215 struct omap_runtime_data *prtd = runtime->private_data;
216 struct omap_pcm_dma_data *dma_data = prtd->dma_data;
217 unsigned long flags;
218 int ret = 0;
219
220 spin_lock_irqsave(&prtd->lock, flags);
221 switch (cmd) {
222 case SNDRV_PCM_TRIGGER_START:
223 case SNDRV_PCM_TRIGGER_RESUME:
224 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
225 prtd->period_index = 0;
226 /* Configure McBSP internal buffer usage */
227 if (dma_data->set_threshold)
228 dma_data->set_threshold(substream);
229
230 omap_start_dma(prtd->dma_ch);
231 break;
232
233 case SNDRV_PCM_TRIGGER_STOP:
234 case SNDRV_PCM_TRIGGER_SUSPEND:
235 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
236 prtd->period_index = -1;
237 omap_stop_dma(prtd->dma_ch);
238 break;
239 default:
240 ret = -EINVAL;
241 }
242 spin_unlock_irqrestore(&prtd->lock, flags);
243
244 return ret;
245}
246
247static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
248{
249 struct snd_pcm_runtime *runtime = substream->runtime;
250 struct omap_runtime_data *prtd = runtime->private_data;
251 dma_addr_t ptr;
252 snd_pcm_uframes_t offset;
253
254 if (cpu_is_omap1510()) {
255 offset = prtd->period_index * runtime->period_size;
256 } else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
257 ptr = omap_get_dma_dst_pos(prtd->dma_ch);
258 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
259 } else {
260 ptr = omap_get_dma_src_pos(prtd->dma_ch);
261 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
262 }
263
264 if (offset >= runtime->buffer_size)
265 offset = 0;
266
267 return offset;
268}
269
270static int omap_pcm_open(struct snd_pcm_substream *substream)
271{
272 struct snd_pcm_runtime *runtime = substream->runtime;
273 struct omap_runtime_data *prtd;
274 int ret;
275
276 snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
277
278 /* Ensure that buffer size is a multiple of period size */
279 ret = snd_pcm_hw_constraint_integer(runtime,
280 SNDRV_PCM_HW_PARAM_PERIODS);
281 if (ret < 0)
282 goto out;
283
284 prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
285 if (prtd == NULL) {
286 ret = -ENOMEM;
287 goto out;
288 }
289 spin_lock_init(&prtd->lock);
290 runtime->private_data = prtd;
291
292out:
293 return ret;
294}
295
296static int omap_pcm_close(struct snd_pcm_substream *substream)
297{
298 struct snd_pcm_runtime *runtime = substream->runtime;
299
300 kfree(runtime->private_data);
301 return 0;
302}
303
304static int omap_pcm_mmap(struct snd_pcm_substream *substream,
305 struct vm_area_struct *vma)
306{
307 struct snd_pcm_runtime *runtime = substream->runtime;
308
309 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
310 runtime->dma_area,
311 runtime->dma_addr,
312 runtime->dma_bytes);
313}
314
315static struct snd_pcm_ops omap_pcm_ops = {
316 .open = omap_pcm_open,
317 .close = omap_pcm_close,
318 .ioctl = snd_pcm_lib_ioctl,
319 .hw_params = omap_pcm_hw_params,
320 .hw_free = omap_pcm_hw_free,
321 .prepare = omap_pcm_prepare,
322 .trigger = omap_pcm_trigger,
323 .pointer = omap_pcm_pointer,
324 .mmap = omap_pcm_mmap,
325};
326
327static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
328
329static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
330 int stream)
331{
332 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
333 struct snd_dma_buffer *buf = &substream->dma_buffer;
334 size_t size = omap_pcm_hardware.buffer_bytes_max;
335
336 buf->dev.type = SNDRV_DMA_TYPE_DEV;
337 buf->dev.dev = pcm->card->dev;
338 buf->private_data = NULL;
339 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
340 &buf->addr, GFP_KERNEL);
341 if (!buf->area)
342 return -ENOMEM;
343
344 buf->bytes = size;
345 return 0;
346}
347
348static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
349{
350 struct snd_pcm_substream *substream;
351 struct snd_dma_buffer *buf;
352 int stream;
353
354 for (stream = 0; stream < 2; stream++) {
355 substream = pcm->streams[stream].substream;
356 if (!substream)
357 continue;
358
359 buf = &substream->dma_buffer;
360 if (!buf->area)
361 continue;
362
363 dma_free_writecombine(pcm->card->dev, buf->bytes,
364 buf->area, buf->addr);
365 buf->area = NULL;
366 }
367}
368
369static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
370{
371 struct snd_card *card = rtd->card->snd_card;
372 struct snd_soc_dai *dai = rtd->cpu_dai;
373 struct snd_pcm *pcm = rtd->pcm;
374 int ret = 0;
375
376 if (!card->dev->dma_mask)
377 card->dev->dma_mask = &omap_pcm_dmamask;
378 if (!card->dev->coherent_dma_mask)
379 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
380
381 if (dai->driver->playback.channels_min) {
382 ret = omap_pcm_preallocate_dma_buffer(pcm,
383 SNDRV_PCM_STREAM_PLAYBACK);
384 if (ret)
385 goto out;
386 }
387
388 if (dai->driver->capture.channels_min) {
389 ret = omap_pcm_preallocate_dma_buffer(pcm,
390 SNDRV_PCM_STREAM_CAPTURE);
391 if (ret)
392 goto out;
393 }
394
395out:
396 return ret;
397}
398
399static struct snd_soc_platform_driver omap_soc_platform = {
400 .ops = &omap_pcm_ops,
401 .pcm_new = omap_pcm_new,
402 .pcm_free = omap_pcm_free_dma_buffers,
403};
404
405static __devinit int omap_pcm_probe(struct platform_device *pdev)
406{
407 return snd_soc_register_platform(&pdev->dev,
408 &omap_soc_platform);
409}
410
411static int __devexit omap_pcm_remove(struct platform_device *pdev)
412{
413 snd_soc_unregister_platform(&pdev->dev);
414 return 0;
415}
416
417static struct platform_driver omap_pcm_driver = {
418 .driver = {
419 .name = "omap-pcm-audio",
420 .owner = THIS_MODULE,
421 },
422
423 .probe = omap_pcm_probe,
424 .remove = __devexit_p(omap_pcm_remove),
425};
426
427static int __init snd_omap_pcm_init(void)
428{
429 return platform_driver_register(&omap_pcm_driver);
430}
431module_init(snd_omap_pcm_init);
432
433static void __exit snd_omap_pcm_exit(void)
434{
435 platform_driver_unregister(&omap_pcm_driver);
436}
437module_exit(snd_omap_pcm_exit);
438
439MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
440MODULE_DESCRIPTION("OMAP PCM DMA module");
441MODULE_LICENSE("GPL");