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.h"
43 #include "bf5xx-sport.h"
44
45 static unsigned int ac97_chan_mask[] = {
46 SP_FL, /* Mono */
47 SP_STEREO, /* Stereo */
48 SP_2DOT1, /* 2.1*/
49 SP_QUAD,/*Quadraquic*/
50 SP_FL | SP_FR | SP_FC | SP_SL | SP_SR,/*5 channels */
51 SP_5DOT1, /* 5.1 */
52 };
53
54 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
bf5xx_mmap_copy(struct snd_pcm_substream * substream,snd_pcm_uframes_t count)55 static 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
bf5xx_dma_irq(void * data)80 static 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 /* The memory size for pure pcm data is 128*1024 = 0x20000 bytes.
99 * The total rx/tx buffer is for ac97 frame to hold all pcm data
100 * is 0x20000 * sizeof(struct ac97_frame) / 4.
101 */
102 static 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, /* 128 kbytes */
115 .fifo_size = 16,
116 };
117
bf5xx_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)118 static 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
bf5xx_pcm_hw_free(struct snd_pcm_substream * substream)129 static 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
bf5xx_pcm_prepare(struct snd_pcm_substream * substream)149 static 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 /* An intermediate buffer is introduced for implementing mmap for
155 * SPORT working in TMD mode(include AC97).
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
bf5xx_pcm_trigger(struct snd_pcm_substream * substream,int cmd)181 static 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
bf5xx_pcm_pointer(struct snd_pcm_substream * substream)220 static 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
bf5xx_pcm_open(struct snd_pcm_substream * substream)242 static 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)
bf5xx_pcm_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * vma)271 static 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
bf5xx_pcm_copy(struct snd_pcm_substream * substream,int channel,snd_pcm_uframes_t pos,void __user * buf,snd_pcm_uframes_t count)282 static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
283 snd_pcm_uframes_t pos,
284 void __user *buf, snd_pcm_uframes_t count)
285 {
286 struct snd_pcm_runtime *runtime = substream->runtime;
287 unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
288 pr_debug("%s copy pos:0x%lx count:0x%lx\n",
289 substream->stream ? "Capture" : "Playback", pos, count);
290
291 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
292 bf5xx_pcm_to_ac97((struct ac97_frame *)runtime->dma_area + pos,
293 (__u16 *)buf, count, chan_mask);
294 else
295 bf5xx_ac97_to_pcm((struct ac97_frame *)runtime->dma_area + pos,
296 (__u16 *)buf, count);
297 return 0;
298 }
299 #endif
300
301 static struct snd_pcm_ops bf5xx_pcm_ac97_ops = {
302 .open = bf5xx_pcm_open,
303 .ioctl = snd_pcm_lib_ioctl,
304 .hw_params = bf5xx_pcm_hw_params,
305 .hw_free = bf5xx_pcm_hw_free,
306 .prepare = bf5xx_pcm_prepare,
307 .trigger = bf5xx_pcm_trigger,
308 .pointer = bf5xx_pcm_pointer,
309 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
310 .mmap = bf5xx_pcm_mmap,
311 #else
312 .copy = bf5xx_pcm_copy,
313 #endif
314 };
315
bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm * pcm,int stream)316 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
317 {
318 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
319 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
320 struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
321 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
322 struct snd_dma_buffer *buf = &substream->dma_buffer;
323 size_t size = bf5xx_pcm_hardware.buffer_bytes_max
324 * sizeof(struct ac97_frame) / 4;
325
326 buf->dev.type = SNDRV_DMA_TYPE_DEV;
327 buf->dev.dev = pcm->card->dev;
328 buf->private_data = NULL;
329 buf->area = dma_alloc_coherent(pcm->card->dev, size,
330 &buf->addr, GFP_KERNEL);
331 if (!buf->area) {
332 pr_err("Failed to allocate dma memory\n");
333 pr_err("Please increase uncached DMA memory region\n");
334 return -ENOMEM;
335 }
336 buf->bytes = size;
337
338 pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
339 buf->area, buf->bytes);
340
341 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
342 sport_handle->tx_buf = buf->area;
343 else
344 sport_handle->rx_buf = buf->area;
345
346 /*
347 * Need to allocate local buffer when enable
348 * MMAP for SPORT working in TMD mode (include AC97).
349 */
350 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
351 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
352 if (!sport_handle->tx_dma_buf) {
353 sport_handle->tx_dma_buf = dma_alloc_coherent(NULL, \
354 size, &sport_handle->tx_dma_phy, GFP_KERNEL);
355 if (!sport_handle->tx_dma_buf) {
356 pr_err("Failed to allocate memory for tx dma buf - Please increase uncached DMA memory region\n");
357 return -ENOMEM;
358 } else
359 memset(sport_handle->tx_dma_buf, 0, size);
360 } else
361 memset(sport_handle->tx_dma_buf, 0, size);
362 } else {
363 if (!sport_handle->rx_dma_buf) {
364 sport_handle->rx_dma_buf = dma_alloc_coherent(NULL, \
365 size, &sport_handle->rx_dma_phy, GFP_KERNEL);
366 if (!sport_handle->rx_dma_buf) {
367 pr_err("Failed to allocate memory for rx dma buf - Please increase uncached DMA memory region\n");
368 return -ENOMEM;
369 } else
370 memset(sport_handle->rx_dma_buf, 0, size);
371 } else
372 memset(sport_handle->rx_dma_buf, 0, size);
373 }
374 #endif
375 return 0;
376 }
377
bf5xx_pcm_free_dma_buffers(struct snd_pcm * pcm)378 static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
379 {
380 struct snd_pcm_substream *substream;
381 struct snd_dma_buffer *buf;
382 int stream;
383 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
384 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
385 struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
386 struct sport_device *sport_handle = snd_soc_dai_get_drvdata(cpu_dai);
387 size_t size = bf5xx_pcm_hardware.buffer_bytes_max *
388 sizeof(struct ac97_frame) / 4;
389 #endif
390 for (stream = 0; stream < 2; stream++) {
391 substream = pcm->streams[stream].substream;
392 if (!substream)
393 continue;
394
395 buf = &substream->dma_buffer;
396 if (!buf->area)
397 continue;
398 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
399 buf->area = NULL;
400 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
401 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
402 if (sport_handle->tx_dma_buf)
403 dma_free_coherent(NULL, size, \
404 sport_handle->tx_dma_buf, 0);
405 sport_handle->tx_dma_buf = NULL;
406 } else {
407
408 if (sport_handle->rx_dma_buf)
409 dma_free_coherent(NULL, size, \
410 sport_handle->rx_dma_buf, 0);
411 sport_handle->rx_dma_buf = NULL;
412 }
413 #endif
414 }
415 }
416
bf5xx_pcm_ac97_new(struct snd_soc_pcm_runtime * rtd)417 static int bf5xx_pcm_ac97_new(struct snd_soc_pcm_runtime *rtd)
418 {
419 struct snd_card *card = rtd->card->snd_card;
420 struct snd_pcm *pcm = rtd->pcm;
421 int ret;
422
423 pr_debug("%s enter\n", __func__);
424 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
425 if (ret)
426 return ret;
427
428 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
429 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
430 SNDRV_PCM_STREAM_PLAYBACK);
431 if (ret)
432 goto out;
433 }
434
435 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
436 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
437 SNDRV_PCM_STREAM_CAPTURE);
438 if (ret)
439 goto out;
440 }
441 out:
442 return ret;
443 }
444
445 static struct snd_soc_platform_driver bf5xx_ac97_soc_platform = {
446 .ops = &bf5xx_pcm_ac97_ops,
447 .pcm_new = bf5xx_pcm_ac97_new,
448 .pcm_free = bf5xx_pcm_free_dma_buffers,
449 };
450
bf5xx_soc_platform_probe(struct platform_device * pdev)451 static int bf5xx_soc_platform_probe(struct platform_device *pdev)
452 {
453 return devm_snd_soc_register_platform(&pdev->dev,
454 &bf5xx_ac97_soc_platform);
455 }
456
457 static struct platform_driver bf5xx_pcm_driver = {
458 .driver = {
459 .name = "bfin-ac97-pcm-audio",
460 },
461
462 .probe = bf5xx_soc_platform_probe,
463 };
464
465 module_platform_driver(bf5xx_pcm_driver);
466
467 MODULE_AUTHOR("Cliff Cai");
468 MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
469 MODULE_LICENSE("GPL");
470