1 /*
2 * File: sound/soc/blackfin/bf5xx-ac97-pcm.c
3 * Author: Cliff Cai <Cliff.Cai@analog.com>
4 *
5 * Created: Tue June 06 2008
6 * Description: DMA Driver for AC97 sound chip
7 *
8 * Modified:
9 * Copyright 2008 Analog Devices Inc.
10 *
11 * Bugs: Enter bugs at http://blackfin.uclinux.org/
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, see the file COPYING, or write
25 * to the Free Software Foundation, Inc.,
26 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
27 */
28
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
46 static unsigned int ac97_chan_mask[] = {
47 SP_FL, /* Mono */
48 SP_STEREO, /* Stereo */
49 SP_2DOT1, /* 2.1*/
50 SP_QUAD,/*Quadraquic*/
51 SP_FL | SP_FR | SP_FC | SP_SL | SP_SR,/*5 channels */
52 SP_5DOT1, /* 5.1 */
53 };
54
55 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
bf5xx_mmap_copy(struct snd_pcm_substream * substream,snd_pcm_uframes_t count)56 static 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
bf5xx_dma_irq(void * data)81 static 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 /* The memory size for pure pcm data is 128*1024 = 0x20000 bytes.
100 * The total rx/tx buffer is for ac97 frame to hold all pcm data
101 * is 0x20000 * sizeof(struct ac97_frame) / 4.
102 */
103 static 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, /* 128 kbytes */
117 .fifo_size = 16,
118 };
119
bf5xx_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)120 static 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
bf5xx_pcm_hw_free(struct snd_pcm_substream * substream)131 static 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
bf5xx_pcm_prepare(struct snd_pcm_substream * substream)151 static 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 /* An intermediate buffer is introduced for implementing mmap for
157 * SPORT working in TMD mode(include AC97).
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
bf5xx_pcm_trigger(struct snd_pcm_substream * substream,int cmd)183 static 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
bf5xx_pcm_pointer(struct snd_pcm_substream * substream)222 static 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
bf5xx_pcm_open(struct snd_pcm_substream * substream)244 static 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)
bf5xx_pcm_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * vma)273 static 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
bf5xx_pcm_copy(struct snd_pcm_substream * substream,int channel,snd_pcm_uframes_t pos,void __user * buf,snd_pcm_uframes_t count)284 static 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
303 static 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
bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm * pcm,int stream)318 static 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 * Need to allocate local buffer when enable
350 * MMAP for SPORT working in TMD mode (include AC97).
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
bf5xx_pcm_free_dma_buffers(struct snd_pcm * pcm)380 static 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
419 static u64 bf5xx_pcm_dmamask = DMA_BIT_MASK(32);
420
bf5xx_pcm_ac97_new(struct snd_soc_pcm_runtime * rtd)421 static int bf5xx_pcm_ac97_new(struct snd_soc_pcm_runtime *rtd)
422 {
423 struct snd_card *card = rtd->card->snd_card;
424 struct snd_pcm *pcm = rtd->pcm;
425 int ret = 0;
426
427 pr_debug("%s enter\n", __func__);
428 if (!card->dev->dma_mask)
429 card->dev->dma_mask = &bf5xx_pcm_dmamask;
430 if (!card->dev->coherent_dma_mask)
431 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
432
433 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
434 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
435 SNDRV_PCM_STREAM_PLAYBACK);
436 if (ret)
437 goto out;
438 }
439
440 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
441 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
442 SNDRV_PCM_STREAM_CAPTURE);
443 if (ret)
444 goto out;
445 }
446 out:
447 return ret;
448 }
449
450 static struct snd_soc_platform_driver bf5xx_ac97_soc_platform = {
451 .ops = &bf5xx_pcm_ac97_ops,
452 .pcm_new = bf5xx_pcm_ac97_new,
453 .pcm_free = bf5xx_pcm_free_dma_buffers,
454 };
455
bf5xx_soc_platform_probe(struct platform_device * pdev)456 static int __devinit bf5xx_soc_platform_probe(struct platform_device *pdev)
457 {
458 return snd_soc_register_platform(&pdev->dev, &bf5xx_ac97_soc_platform);
459 }
460
bf5xx_soc_platform_remove(struct platform_device * pdev)461 static int __devexit bf5xx_soc_platform_remove(struct platform_device *pdev)
462 {
463 snd_soc_unregister_platform(&pdev->dev);
464 return 0;
465 }
466
467 static struct platform_driver bf5xx_pcm_driver = {
468 .driver = {
469 .name = "bfin-ac97-pcm-audio",
470 .owner = THIS_MODULE,
471 },
472
473 .probe = bf5xx_soc_platform_probe,
474 .remove = __devexit_p(bf5xx_soc_platform_remove),
475 };
476
477 module_platform_driver(bf5xx_pcm_driver);
478
479 MODULE_AUTHOR("Cliff Cai");
480 MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
481 MODULE_LICENSE("GPL");
482