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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.h"
43#include "bf5xx-sport.h"
44
45static unsigned int ac97_chan_mask[] = {
46 SP_FL,
47 SP_STEREO,
48 SP_2DOT1,
49 SP_QUAD,
50 SP_FL | SP_FR | SP_FC | SP_SL | SP_SR,
51 SP_5DOT1,
52};
53
54#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
55static void bf5xx_mmap_copy(struct snd_pcm_substream *substream,
56 snd_pcm_uframes_t count)
57{
58 struct snd_pcm_runtime *runtime = substream->runtime;
59 struct sport_device *sport = runtime->private_data;
60 unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
61 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
62 bf5xx_pcm_to_ac97((struct ac97_frame *)sport->tx_dma_buf +
63 sport->tx_pos, (__u16 *)runtime->dma_area + sport->tx_pos *
64 runtime->channels, count, chan_mask);
65 sport->tx_pos += runtime->period_size;
66 if (sport->tx_pos >= runtime->buffer_size)
67 sport->tx_pos %= runtime->buffer_size;
68 sport->tx_delay_pos = sport->tx_pos;
69 } else {
70 bf5xx_ac97_to_pcm((struct ac97_frame *)sport->rx_dma_buf +
71 sport->rx_pos, (__u16 *)runtime->dma_area + sport->rx_pos *
72 runtime->channels, count);
73 sport->rx_pos += runtime->period_size;
74 if (sport->rx_pos >= runtime->buffer_size)
75 sport->rx_pos %= runtime->buffer_size;
76 }
77}
78#endif
79
80static void bf5xx_dma_irq(void *data)
81{
82 struct snd_pcm_substream *pcm = data;
83#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
84 struct snd_pcm_runtime *runtime = pcm->runtime;
85 struct sport_device *sport = runtime->private_data;
86 bf5xx_mmap_copy(pcm, runtime->period_size);
87 if (pcm->stream == SNDRV_PCM_STREAM_PLAYBACK) {
88 if (sport->once == 0) {
89 snd_pcm_period_elapsed(pcm);
90 bf5xx_mmap_copy(pcm, runtime->period_size);
91 sport->once = 1;
92 }
93 }
94#endif
95 snd_pcm_period_elapsed(pcm);
96}
97
98
99
100
101
102static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
103 .info = SNDRV_PCM_INFO_INTERLEAVED |
104#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
105 SNDRV_PCM_INFO_MMAP |
106 SNDRV_PCM_INFO_MMAP_VALID |
107#endif
108 SNDRV_PCM_INFO_BLOCK_TRANSFER,
109
110 .period_bytes_min = 32,
111 .period_bytes_max = 0x10000,
112 .periods_min = 1,
113 .periods_max = PAGE_SIZE/32,
114 .buffer_bytes_max = 0x20000,
115 .fifo_size = 16,
116};
117
118static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
119 struct snd_pcm_hw_params *params)
120{
121 size_t size = bf5xx_pcm_hardware.buffer_bytes_max
122 * sizeof(struct ac97_frame) / 4;
123
124 snd_pcm_lib_malloc_pages(substream, size);
125
126 return 0;
127}
128
129static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
130{
131#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
132 struct snd_pcm_runtime *runtime = substream->runtime;
133 struct sport_device *sport = runtime->private_data;
134
135 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
136 sport->once = 0;
137 if (runtime->dma_area)
138 memset(runtime->dma_area, 0, runtime->buffer_size);
139 memset(sport->tx_dma_buf, 0, runtime->buffer_size *
140 sizeof(struct ac97_frame));
141 } else
142 memset(sport->rx_dma_buf, 0, runtime->buffer_size *
143 sizeof(struct ac97_frame));
144#endif
145 snd_pcm_lib_free_pages(substream);
146 return 0;
147}
148
149static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
150{
151 struct snd_pcm_runtime *runtime = substream->runtime;
152 struct sport_device *sport = runtime->private_data;
153
154
155
156
157#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
158 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
159 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
160 sport_config_tx_dma(sport, sport->tx_dma_buf, runtime->periods,
161 runtime->period_size * sizeof(struct ac97_frame));
162 } else {
163 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
164 sport_config_rx_dma(sport, sport->rx_dma_buf, runtime->periods,
165 runtime->period_size * sizeof(struct ac97_frame));
166 }
167#else
168 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
169 sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
170 sport_config_tx_dma(sport, runtime->dma_area, runtime->periods,
171 runtime->period_size * sizeof(struct ac97_frame));
172 } else {
173 sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
174 sport_config_rx_dma(sport, runtime->dma_area, runtime->periods,
175 runtime->period_size * sizeof(struct ac97_frame));
176 }
177#endif
178 return 0;
179}
180
181static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
182{
183 struct snd_pcm_runtime *runtime = substream->runtime;
184 struct sport_device *sport = runtime->private_data;
185 int ret = 0;
186
187 pr_debug("%s enter\n", __func__);
188 switch (cmd) {
189 case SNDRV_PCM_TRIGGER_START:
190 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
191#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
192 bf5xx_mmap_copy(substream, runtime->period_size);
193 sport->tx_delay_pos = 0;
194#endif
195 sport_tx_start(sport);
196 } else
197 sport_rx_start(sport);
198 break;
199 case SNDRV_PCM_TRIGGER_STOP:
200 case SNDRV_PCM_TRIGGER_SUSPEND:
201 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
202 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
203#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
204 sport->tx_pos = 0;
205#endif
206 sport_tx_stop(sport);
207 } else {
208#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
209 sport->rx_pos = 0;
210#endif
211 sport_rx_stop(sport);
212 }
213 break;
214 default:
215 ret = -EINVAL;
216 }
217 return ret;
218}
219
220static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
221{
222 struct snd_pcm_runtime *runtime = substream->runtime;
223 struct sport_device *sport = runtime->private_data;
224 unsigned int curr;
225
226#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
227 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
228 curr = sport->tx_delay_pos;
229 else
230 curr = sport->rx_pos;
231#else
232
233 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
234 curr = sport_curr_offset_tx(sport) / sizeof(struct ac97_frame);
235 else
236 curr = sport_curr_offset_rx(sport) / sizeof(struct ac97_frame);
237
238#endif
239 return curr;
240}
241
242static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
243{
244 struct snd_soc_pcm_runtime *rtd = substream->private_data;
245 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
246 struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
247 struct snd_pcm_runtime *runtime = substream->runtime;
248 int ret;
249
250 pr_debug("%s enter\n", __func__);
251 snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
252
253 ret = snd_pcm_hw_constraint_integer(runtime,
254 SNDRV_PCM_HW_PARAM_PERIODS);
255 if (ret < 0)
256 goto out;
257
258 if (sport_handle != NULL)
259 runtime->private_data = sport_handle;
260 else {
261 pr_err("sport_handle is NULL\n");
262 return -1;
263 }
264 return 0;
265
266 out:
267 return ret;
268}
269
270#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
271static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
272 struct vm_area_struct *vma)
273{
274 struct snd_pcm_runtime *runtime = substream->runtime;
275 size_t size = vma->vm_end - vma->vm_start;
276 vma->vm_start = (unsigned long)runtime->dma_area;
277 vma->vm_end = vma->vm_start + size;
278 vma->vm_flags |= VM_SHARED;
279 return 0 ;
280}
281#else
282static int bf5xx_pcm_copy(struct snd_pcm_substream *substream,
283 int channel, unsigned long pos,
284 void *buf, unsigned long count)
285{
286 struct snd_pcm_runtime *runtime = substream->runtime;
287 unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
288 struct ac97_frame *dst;
289
290 pr_debug("%s copy pos:0x%lx count:0x%lx\n",
291 substream->stream ? "Capture" : "Playback", pos, count);
292 dst = (struct ac97_frame *)runtime->dma_area +
293 bytes_to_frames(runtime, pos);
294 count = bytes_to_frames(runtime, count);
295
296 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
297 bf5xx_pcm_to_ac97(dst, buf, count, chan_mask);
298 else
299 bf5xx_ac97_to_pcm(dst, buf, count);
300 return 0;
301}
302
303static int bf5xx_pcm_copy_user(struct snd_pcm_substream *substream,
304 int channel, unsigned long pos,
305 void __user *buf, unsigned long count)
306{
307 return bf5xx_pcm_copy(substream, channel, pos, (void *)buf, count);
308}
309#endif
310
311static const struct snd_pcm_ops bf5xx_pcm_ac97_ops = {
312 .open = bf5xx_pcm_open,
313 .ioctl = snd_pcm_lib_ioctl,
314 .hw_params = bf5xx_pcm_hw_params,
315 .hw_free = bf5xx_pcm_hw_free,
316 .prepare = bf5xx_pcm_prepare,
317 .trigger = bf5xx_pcm_trigger,
318 .pointer = bf5xx_pcm_pointer,
319#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
320 .mmap = bf5xx_pcm_mmap,
321#else
322 .copy_user = bf5xx_pcm_copy_user,
323 .copy_kernel = bf5xx_pcm_copy,
324#endif
325};
326
327static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
328{
329 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
330 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
331 struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
332 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
333 struct snd_dma_buffer *buf = &substream->dma_buffer;
334 size_t size = bf5xx_pcm_hardware.buffer_bytes_max
335 * sizeof(struct ac97_frame) / 4;
336
337 buf->dev.type = SNDRV_DMA_TYPE_DEV;
338 buf->dev.dev = pcm->card->dev;
339 buf->private_data = NULL;
340 buf->area = dma_alloc_coherent(pcm->card->dev, size,
341 &buf->addr, GFP_KERNEL);
342 if (!buf->area) {
343 pr_err("Failed to allocate dma memory\n");
344 pr_err("Please increase uncached DMA memory region\n");
345 return -ENOMEM;
346 }
347 buf->bytes = size;
348
349 pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
350 buf->area, buf->bytes);
351
352 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
353 sport_handle->tx_buf = buf->area;
354 else
355 sport_handle->rx_buf = buf->area;
356
357
358
359
360
361#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
362 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
363 if (!sport_handle->tx_dma_buf) {
364 sport_handle->tx_dma_buf = dma_alloc_coherent(NULL, \
365 size, &sport_handle->tx_dma_phy, GFP_KERNEL);
366 if (!sport_handle->tx_dma_buf) {
367 pr_err("Failed to allocate memory for tx dma buf - Please increase uncached DMA memory region\n");
368 return -ENOMEM;
369 } else
370 memset(sport_handle->tx_dma_buf, 0, size);
371 } else
372 memset(sport_handle->tx_dma_buf, 0, size);
373 } else {
374 if (!sport_handle->rx_dma_buf) {
375 sport_handle->rx_dma_buf = dma_alloc_coherent(NULL, \
376 size, &sport_handle->rx_dma_phy, GFP_KERNEL);
377 if (!sport_handle->rx_dma_buf) {
378 pr_err("Failed to allocate memory for rx dma buf - Please increase uncached DMA memory region\n");
379 return -ENOMEM;
380 } else
381 memset(sport_handle->rx_dma_buf, 0, size);
382 } else
383 memset(sport_handle->rx_dma_buf, 0, size);
384 }
385#endif
386 return 0;
387}
388
389static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
390{
391 struct snd_pcm_substream *substream;
392 struct snd_dma_buffer *buf;
393 int stream;
394#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
395 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
396 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
397 struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
398 size_t size = bf5xx_pcm_hardware.buffer_bytes_max *
399 sizeof(struct ac97_frame) / 4;
400#endif
401 for (stream = 0; stream < 2; stream++) {
402 substream = pcm->streams[stream].substream;
403 if (!substream)
404 continue;
405
406 buf = &substream->dma_buffer;
407 if (!buf->area)
408 continue;
409 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
410 buf->area = NULL;
411#if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
412 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
413 if (sport_handle->tx_dma_buf)
414 dma_free_coherent(NULL, size, \
415 sport_handle->tx_dma_buf, 0);
416 sport_handle->tx_dma_buf = NULL;
417 } else {
418
419 if (sport_handle->rx_dma_buf)
420 dma_free_coherent(NULL, size, \
421 sport_handle->rx_dma_buf, 0);
422 sport_handle->rx_dma_buf = NULL;
423 }
424#endif
425 }
426}
427
428static int bf5xx_pcm_ac97_new(struct snd_soc_pcm_runtime *rtd)
429{
430 struct snd_card *card = rtd->card->snd_card;
431 struct snd_pcm *pcm = rtd->pcm;
432 int ret;
433
434 pr_debug("%s enter\n", __func__);
435 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
436 if (ret)
437 return ret;
438
439 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
440 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
441 SNDRV_PCM_STREAM_PLAYBACK);
442 if (ret)
443 goto out;
444 }
445
446 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
447 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
448 SNDRV_PCM_STREAM_CAPTURE);
449 if (ret)
450 goto out;
451 }
452 out:
453 return ret;
454}
455
456static struct snd_soc_platform_driver bf5xx_ac97_soc_platform = {
457 .ops = &bf5xx_pcm_ac97_ops,
458 .pcm_new = bf5xx_pcm_ac97_new,
459 .pcm_free = bf5xx_pcm_free_dma_buffers,
460};
461
462static int bf5xx_soc_platform_probe(struct platform_device *pdev)
463{
464 return devm_snd_soc_register_platform(&pdev->dev,
465 &bf5xx_ac97_soc_platform);
466}
467
468static struct platform_driver bf5xx_pcm_driver = {
469 .driver = {
470 .name = "bfin-ac97-pcm-audio",
471 },
472
473 .probe = bf5xx_soc_platform_probe,
474};
475
476module_platform_driver(bf5xx_pcm_driver);
477
478MODULE_AUTHOR("Cliff Cai");
479MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
480MODULE_LICENSE("GPL");
481
