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/slab.h>
33 #include <linux/dma-mapping.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_pcm_runtime *runtime = substream->runtime;
247 int ret;
248
249 pr_debug("%s enter\n", __func__);
250 snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
251
252 ret = snd_pcm_hw_constraint_integer(runtime,
253 SNDRV_PCM_HW_PARAM_PERIODS);
254 if (ret < 0)
255 goto out;
256
257 if (sport_handle != NULL)
258 runtime->private_data = sport_handle;
259 else {
260 pr_err("sport_handle is NULL\n");
261 return -1;
262 }
263 return 0;
264
265 out:
266 return ret;
267 }
268
269 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
bf5xx_pcm_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * vma)270 static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
271 struct vm_area_struct *vma)
272 {
273 struct snd_pcm_runtime *runtime = substream->runtime;
274 size_t size = vma->vm_end - vma->vm_start;
275 vma->vm_start = (unsigned long)runtime->dma_area;
276 vma->vm_end = vma->vm_start + size;
277 vma->vm_flags |= VM_SHARED;
278 return 0 ;
279 }
280 #else
bf5xx_pcm_copy(struct snd_pcm_substream * substream,int channel,snd_pcm_uframes_t pos,void __user * buf,snd_pcm_uframes_t count)281 static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
282 snd_pcm_uframes_t pos,
283 void __user *buf, snd_pcm_uframes_t count)
284 {
285 struct snd_pcm_runtime *runtime = substream->runtime;
286 unsigned int chan_mask = ac97_chan_mask[runtime->channels - 1];
287 pr_debug("%s copy pos:0x%lx count:0x%lx\n",
288 substream->stream ? "Capture" : "Playback", pos, count);
289
290 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
291 bf5xx_pcm_to_ac97((struct ac97_frame *)runtime->dma_area + pos,
292 (__u16 *)buf, count, chan_mask);
293 else
294 bf5xx_ac97_to_pcm((struct ac97_frame *)runtime->dma_area + pos,
295 (__u16 *)buf, count);
296 return 0;
297 }
298 #endif
299
300 struct snd_pcm_ops bf5xx_pcm_ac97_ops = {
301 .open = bf5xx_pcm_open,
302 .ioctl = snd_pcm_lib_ioctl,
303 .hw_params = bf5xx_pcm_hw_params,
304 .hw_free = bf5xx_pcm_hw_free,
305 .prepare = bf5xx_pcm_prepare,
306 .trigger = bf5xx_pcm_trigger,
307 .pointer = bf5xx_pcm_pointer,
308 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
309 .mmap = bf5xx_pcm_mmap,
310 #else
311 .copy = bf5xx_pcm_copy,
312 #endif
313 };
314
bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm * pcm,int stream)315 static int bf5xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
316 {
317 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
318 struct snd_dma_buffer *buf = &substream->dma_buffer;
319 size_t size = bf5xx_pcm_hardware.buffer_bytes_max
320 * sizeof(struct ac97_frame) / 4;
321
322 buf->dev.type = SNDRV_DMA_TYPE_DEV;
323 buf->dev.dev = pcm->card->dev;
324 buf->private_data = NULL;
325 buf->area = dma_alloc_coherent(pcm->card->dev, size,
326 &buf->addr, GFP_KERNEL);
327 if (!buf->area) {
328 pr_err("Failed to allocate dma memory\n");
329 pr_err("Please increase uncached DMA memory region\n");
330 return -ENOMEM;
331 }
332 buf->bytes = size;
333
334 pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
335 buf->area, buf->bytes);
336
337 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
338 sport_handle->tx_buf = buf->area;
339 else
340 sport_handle->rx_buf = buf->area;
341
342 /*
343 * Need to allocate local buffer when enable
344 * MMAP for SPORT working in TMD mode (include AC97).
345 */
346 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
347 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
348 if (!sport_handle->tx_dma_buf) {
349 sport_handle->tx_dma_buf = dma_alloc_coherent(NULL, \
350 size, &sport_handle->tx_dma_phy, GFP_KERNEL);
351 if (!sport_handle->tx_dma_buf) {
352 pr_err("Failed to allocate memory for tx dma \
353 buf - Please increase uncached DMA \
354 memory region\n");
355 return -ENOMEM;
356 } else
357 memset(sport_handle->tx_dma_buf, 0, size);
358 } else
359 memset(sport_handle->tx_dma_buf, 0, size);
360 } else {
361 if (!sport_handle->rx_dma_buf) {
362 sport_handle->rx_dma_buf = dma_alloc_coherent(NULL, \
363 size, &sport_handle->rx_dma_phy, GFP_KERNEL);
364 if (!sport_handle->rx_dma_buf) {
365 pr_err("Failed to allocate memory for rx dma \
366 buf - Please increase uncached DMA \
367 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 size_t size = bf5xx_pcm_hardware.buffer_bytes_max *
385 sizeof(struct ac97_frame) / 4;
386 #endif
387 for (stream = 0; stream < 2; stream++) {
388 substream = pcm->streams[stream].substream;
389 if (!substream)
390 continue;
391
392 buf = &substream->dma_buffer;
393 if (!buf->area)
394 continue;
395 dma_free_coherent(NULL, buf->bytes, buf->area, 0);
396 buf->area = NULL;
397 #if defined(CONFIG_SND_BF5XX_MMAP_SUPPORT)
398 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
399 if (sport_handle->tx_dma_buf)
400 dma_free_coherent(NULL, size, \
401 sport_handle->tx_dma_buf, 0);
402 sport_handle->tx_dma_buf = NULL;
403 } else {
404
405 if (sport_handle->rx_dma_buf)
406 dma_free_coherent(NULL, size, \
407 sport_handle->rx_dma_buf, 0);
408 sport_handle->rx_dma_buf = NULL;
409 }
410 #endif
411 }
412 if (sport_handle)
413 sport_done(sport_handle);
414 }
415
416 static u64 bf5xx_pcm_dmamask = DMA_32BIT_MASK;
417
bf5xx_pcm_ac97_new(struct snd_card * card,struct snd_soc_dai * dai,struct snd_pcm * pcm)418 int bf5xx_pcm_ac97_new(struct snd_card *card, struct snd_soc_dai *dai,
419 struct snd_pcm *pcm)
420 {
421 int ret = 0;
422
423 pr_debug("%s enter\n", __func__);
424 if (!card->dev->dma_mask)
425 card->dev->dma_mask = &bf5xx_pcm_dmamask;
426 if (!card->dev->coherent_dma_mask)
427 card->dev->coherent_dma_mask = DMA_32BIT_MASK;
428
429 if (dai->playback.channels_min) {
430 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
431 SNDRV_PCM_STREAM_PLAYBACK);
432 if (ret)
433 goto out;
434 }
435
436 if (dai->capture.channels_min) {
437 ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
438 SNDRV_PCM_STREAM_CAPTURE);
439 if (ret)
440 goto out;
441 }
442 out:
443 return ret;
444 }
445
446 struct snd_soc_platform bf5xx_ac97_soc_platform = {
447 .name = "bf5xx-audio",
448 .pcm_ops = &bf5xx_pcm_ac97_ops,
449 .pcm_new = bf5xx_pcm_ac97_new,
450 .pcm_free = bf5xx_pcm_free_dma_buffers,
451 };
452 EXPORT_SYMBOL_GPL(bf5xx_ac97_soc_platform);
453
bfin_ac97_init(void)454 static int __init bfin_ac97_init(void)
455 {
456 return snd_soc_register_platform(&bf5xx_ac97_soc_platform);
457 }
458 module_init(bfin_ac97_init);
459
bfin_ac97_exit(void)460 static void __exit bfin_ac97_exit(void)
461 {
462 snd_soc_unregister_platform(&bf5xx_ac97_soc_platform);
463 }
464 module_exit(bfin_ac97_exit);
465
466 MODULE_AUTHOR("Cliff Cai");
467 MODULE_DESCRIPTION("ADI Blackfin AC97 PCM DMA module");
468 MODULE_LICENSE("GPL");
469