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29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/platform_device.h>
32#include <linux/dma-mapping.h>
33#include <linux/gfp.h>
34
35#include <sound/core.h>
36#include <sound/pcm.h>
37#include <sound/pcm_params.h>
38#include <sound/soc.h>
39
40#include <asm/dma.h>
41
42#include "bf5xx-ac97-pcm.h"
43#include "bf5xx-ac97.h"
44#include "bf5xx-sport.h"
45
46static unsigned int ac97_chan_mask[] = {
47 SP_FL,
48 SP_STEREO,
49 SP_2DOT1,
50 SP_QUAD,
51 SP_FL | SP_FR | SP_FC | SP_SL | SP_SR,
52 SP_5DOT1,
53};
54
55#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
56static void bf5xx_mmap_copy(struct snd_pcm_substream *substream,
57 snd_pcm_uframes_t count)
58{
59 struct snd_pcm_runtime *runtime = substream->runtime;
60 struct sport_device *sport = runtime->private_data;
61 unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
62 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
63 bf5xx_pcm_to_ac97((struct ac97_frame *)sport->tx_dma_buf +
64 sport->tx_pos, (__u16 *)runtime->dma_area + sport->tx_pos *
65 runtime->channels, count, chan_mask);
66 sport->tx_pos += runtime->period_size;
67 if (sport->tx_pos >= runtime->buffer_size)
68 sport->tx_pos %= runtime->buffer_size;
69 sport->tx_delay_pos = sport->tx_pos;
70 } else {
71 bf5xx_ac97_to_pcm((struct ac97_frame *)sport->rx_dma_buf +
72 sport->rx_pos, (__u16 *)runtime->dma_area + sport->rx_pos *
73 runtime->channels, count);
74 sport->rx_pos += runtime->period_size;
75 if (sport->rx_pos >= runtime->buffer_size)
76 sport->rx_pos %= runtime->buffer_size;
77 }
78}
79#endif
80
81static void bf5xx_dma_irq(void *data)
82{
83 struct snd_pcm_substream *pcm = data;
84#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
85 struct snd_pcm_runtime *runtime = pcm->runtime;
86 struct sport_device *sport = runtime->private_data;
87 bf5xx_mmap_copy(pcm, runtime->period_size);
88 if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK) {
89 if (sport->once == 0) {
90 snd_pcm_period_elapsed(pcm);
91 bf5xx_mmap_copy(pcm, runtime->period_size);
92 sport->once = 1;
93 }
94 }
95#endif
96 snd_pcm_period_elapsed(pcm);
97}
98
99
100
101
102
103static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
104 .info = SNDRV_PCM_INFO_INTERLEAVED |
105#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
106 SNDRV_PCM_INFO_MMAP |
107 SNDRV_PCM_INFO_MMAP_VALID |
108#endif
109 SNDRV_PCM_INFO_BLOCK_TRANSFER,
110
111 .formats = SNDRV_PCM_FMTBIT_S16_LE,
112 .period_bytes_min = 32,
113 .period_bytes_max = 0x10000,
114 .periods_min = 1,
115 .periods_max = PAGE_SIZE/32,
116 .buffer_bytes_max = 0x20000,
117 .fifo_size = 16,
118};
119
120static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
121 struct snd_pcm_hw_params *params)
122{
123 size_t size = bf5xx_pcm_hardware.buffer_bytes_max
124 * sizeof(struct ac97_frame) / 4;
125
126 snd_pcm_lib_malloc_pages(substream, size);
127
128 return 0;
129}
130
131static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
132{
133#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
134 struct snd_pcm_runtime *runtime = substream->runtime;
135 struct sport_device *sport = runtime->private_data;
136
137 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
138 sport->once = 0;
139 if (runtime->dma_area)
140 memset(runtime->dma_area, 0, runtime->buffer_size);
141 memset(sport->tx_dma_buf, 0, runtime->buffer_size *
142 sizeof(struct ac97_frame));
143 } else
144 memset(sport->rx_dma_buf, 0, runtime->buffer_size *
145 sizeof(struct ac97_frame));
146#endif
147 snd_pcm_lib_free_pages(substream);
148 return 0;
149}
150
151static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
152{
153 struct snd_pcm_runtime *runtime = substream->runtime;
154 struct sport_device *sport = runtime->private_data;
155
156
157
158
159#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
160 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
161 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
162 sport_config_tx_dma(sport, sport->tx_dma_buf, runtime->periods,
163 runtime->period_size * sizeof(struct ac97_frame));
164 } else {
165 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
166 sport_config_rx_dma(sport, sport->rx_dma_buf, runtime->periods,
167 runtime->period_size * sizeof(struct ac97_frame));
168 }
169#else
170 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
171 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
172 sport_config_tx_dma(sport, runtime->dma_area, runtime->periods,
173 runtime->period_size * sizeof(struct ac97_frame));
174 } else {
175 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
176 sport_config_rx_dma(sport, runtime->dma_area, runtime->periods,
177 runtime->period_size * sizeof(struct ac97_frame));
178 }
179#endif
180 return 0;
181}
182
183static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
184{
185 struct snd_pcm_runtime *runtime = substream->runtime;
186 struct sport_device *sport = runtime->private_data;
187 int ret = 0;
188
189 pr_debug("%s enter\n", __func__);
190 switch (cmd) {
191 case SNDRV_PCM_TRIGGER_START:
192 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
193#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
194 bf5xx_mmap_copy(substream, runtime->period_size);
195 sport->tx_delay_pos = 0;
196#endif
197 sport_tx_start(sport);
198 } else
199 sport_rx_start(sport);
200 break;
201 case SNDRV_PCM_TRIGGER_STOP:
202 case SNDRV_PCM_TRIGGER_SUSPEND:
203 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
204 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
205#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
206 sport->tx_pos = 0;
207#endif
208 sport_tx_stop(sport);
209 } else {
210#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
211 sport->rx_pos = 0;
212#endif
213 sport_rx_stop(sport);
214 }
215 break;
216 default:
217 ret = -EINVAL;
218 }
219 return ret;
220}
221
222static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
223{
224 struct snd_pcm_runtime *runtime = substream->runtime;
225 struct sport_device *sport = runtime->private_data;
226 unsigned int curr;
227
228#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
229 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
230 curr = sport->tx_delay_pos;
231 else
232 curr = sport->rx_pos;
233#else
234
235 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
236 curr = sport_curr_offset_tx(sport) / sizeof(struct ac97_frame);
237 else
238 curr = sport_curr_offset_rx(sport) / sizeof(struct ac97_frame);
239
240#endif
241 return curr;
242}
243
244static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
245{
246 struct snd_soc_pcm_runtime *rtd = substream->private_data;
247 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
248 struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
249 struct snd_pcm_runtime *runtime = substream->runtime;
250 int ret;
251
252 pr_debug("%s enter\n", __func__);
253 snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
254
255 ret = snd_pcm_hw_constraint_integer(runtime,
256 SNDRV_PCM_HW_PARAM_PERIODS);
257 if (ret < 0)
258 goto out;
259
260 if (sport_handle != NULL)
261 runtime->private_data = sport_handle;
262 else {
263 pr_err("sport_handle is NULL\n");
264 return -1;
265 }
266 return 0;
267
268 out:
269 return ret;
270}
271
272#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
273static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
274 struct vm_area_struct *vma)
275{
276 struct snd_pcm_runtime *runtime = substream->runtime;
277 size_t size = vma->vm_end - vma->vm_start;
278 vma->vm_start = (unsigned long)runtime->dma_area;
279 vma->vm_end = vma->vm_start + size;
280 vma->vm_flags |= VM_SHARED;
281 return 0 ;
282}
283#else
284static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
285 snd_pcm_uframes_t pos,
286 void __user *buf, snd_pcm_uframes_t count)
287{
288 struct snd_pcm_runtime *runtime = substream->runtime;
289 unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
290 pr_debug("%s copy pos:0x%lx count:0x%lx\n",
291 substream->stream ? "Capture" : "Playback", pos, count);
292
293 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
294 bf5xx_pcm_to_ac97((struct ac97_frame *)runtime->dma_area + pos,
295 (__u16 *)buf, count, chan_mask);
296 else
297 bf5xx_ac97_to_pcm((struct ac97_frame *)runtime->dma_area + pos,
298 (__u16 *)buf, count);
299 return 0;
300}
301#endif
302
303static struct snd_pcm_ops bf5xx_pcm_ac97_ops = {
304 .open = bf5xx_pcm_open,
305 .ioctl = snd_pcm_lib_ioctl,
306 .hw_params = bf5xx_pcm_hw_params,
307 .hw_free = bf5xx_pcm_hw_free,
308 .prepare = bf5xx_pcm_prepare,
309 .trigger = bf5xx_pcm_trigger,
310 .pointer = bf5xx_pcm_pointer,
311#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
312 .mmap = bf5xx_pcm_mmap,
313#else
314 .copy = bf5xx_pcm_copy,
315#endif
316};
317
318static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
319{
320 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
321 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
322 struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
323 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
324 struct snd_dma_buffer *buf = &substream->dma_buffer;
325 size_t size = bf5xx_pcm_hardware.buffer_bytes_max
326 * sizeof(struct ac97_frame) / 4;
327
328 buf->dev.type = SNDRV_DMA_TYPE_DEV;
329 buf->dev.dev = pcm->card->dev;
330 buf->private_data = NULL;
331 buf->area = dma_alloc_coherent(pcm->card->dev, size,
332 &buf->addr, GFP_KERNEL);
333 if (!buf->area) {
334 pr_err("Failed to allocate dma memory\n");
335 pr_err("Please increase uncached DMA memory region\n");
336 return -ENOMEM;
337 }
338 buf->bytes = size;
339
340 pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
341 buf->area, buf->bytes);
342
343 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
344 sport_handle->tx_buf = buf->area;
345 else
346 sport_handle->rx_buf = buf->area;
347
348
349
350
351
352#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
353 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
354 if (!sport_handle->tx_dma_buf) {
355 sport_handle->tx_dma_buf = dma_alloc_coherent(NULL, \
356 size, &sport_handle->tx_dma_phy, GFP_KERNEL);
357 if (!sport_handle->tx_dma_buf) {
358 pr_err("Failed to allocate memory for tx dma buf - Please increase uncached DMA memory region\n");
359 return -ENOMEM;
360 } else
361 memset(sport_handle->tx_dma_buf, 0, size);
362 } else
363 memset(sport_handle->tx_dma_buf, 0, size);
364 } else {
365 if (!sport_handle->rx_dma_buf) {
366 sport_handle->rx_dma_buf = dma_alloc_coherent(NULL, \
367 size, &sport_handle->rx_dma_phy, GFP_KERNEL);
368 if (!sport_handle->rx_dma_buf) {
369 pr_err("Failed to allocate memory for rx dma buf - Please increase uncached DMA memory region\n");
370 return -ENOMEM;
371 } else
372 memset(sport_handle->rx_dma_buf, 0, size);
373 } else
374 memset(sport_handle->rx_dma_buf, 0, size);
375 }
376#endif
377 return 0;
378}
379
380static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
381{
382 struct snd_pcm_substream *substream;
383 struct snd_dma_buffer *buf;
384 int stream;
385#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
386 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
387 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
388 struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
389 size_t size = bf5xx_pcm_hardware.buffer_bytes_max *
390 sizeof(struct ac97_frame) / 4;
391#endif
392 for (stream = 0; stream < 2; stream++) {
393 substream = pcm->streams[stream].substream;
394 if (!substream)
395 continue;
396
397 buf = &substream->dma_buffer;
398 if (!buf->area)
399 continue;
400 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
401 buf->area = NULL;
402#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
403 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
404 if (sport_handle->tx_dma_buf)
405 dma_free_coherent(NULL, size, \
406 sport_handle->tx_dma_buf, 0);
407 sport_handle->tx_dma_buf = NULL;
408 } else {
409
410 if (sport_handle->rx_dma_buf)
411 dma_free_coherent(NULL, size, \
412 sport_handle->rx_dma_buf, 0);
413 sport_handle->rx_dma_buf = NULL;
414 }
415#endif
416 }
417}
418
419static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
420
421int bf5xx_pcm_ac97_new(struct snd_soc_pcm_runtime *rtd)
422{
423 struct snd_card *card = rtd->card->snd_card;
424 struct snd_soc_dai *dai = rtd->cpu_dai;
425 struct snd_pcm *pcm = rtd->pcm;
426 int ret = 0;
427
428 pr_debug("%s enter\n", __func__);
429 if (!card->dev->dma_mask)
430 card->dev->dma_mask = &bf5xx_pcm_dmamask;
431 if (!card->dev->coherent_dma_mask)
432 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
433
434 if (dai->driver->playback.channels_min) {
435 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
436 SNDRV_PCM_STREAM_PLAYBACK);
437 if (ret)
438 goto out;
439 }
440
441 if (dai->driver->capture.channels_min) {
442 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
443 SNDRV_PCM_STREAM_CAPTURE);
444 if (ret)
445 goto out;
446 }
447 out:
448 return ret;
449}
450
451static struct snd_soc_platform_driver bf5xx_ac97_soc_platform = {
452 .ops = &bf5xx_pcm_ac97_ops,
453 .pcm_new = bf5xx_pcm_ac97_new,
454 .pcm_free = bf5xx_pcm_free_dma_buffers,
455};
456
457static int __devinit bf5xx_soc_platform_probe(struct platform_device *pdev)
458{
459 return snd_soc_register_platform(&pdev->dev, &bf5xx_ac97_soc_platform);
460}
461
462static int __devexit bf5xx_soc_platform_remove(struct platform_device *pdev)
463{
464 snd_soc_unregister_platform(&pdev->dev);
465 return 0;
466}
467
468static struct platform_driver bf5xx_pcm_driver = {
469 .driver = {
470 .name = "bfin-ac97-pcm-audio",
471 .owner = THIS_MODULE,
472 },
473
474 .probe = bf5xx_soc_platform_probe,
475 .remove = __devexit_p(bf5xx_soc_platform_remove),
476};
477
478static int __init snd_bf5xx_pcm_init(void)
479{
480 return platform_driver_register(&bf5xx_pcm_driver);
481}
482module_init(snd_bf5xx_pcm_init);
483
484static void __exit snd_bf5xx_pcm_exit(void)
485{
486 platform_driver_unregister(&bf5xx_pcm_driver);
487}
488module_exit(snd_bf5xx_pcm_exit);
489
490MODULE_AUTHOR("Cliff Cai");
491MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
492MODULE_LICENSE("GPL");
493
