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-rw-r--r--sound/soc/davinci/davinci-pcm.c389
1 files changed, 389 insertions, 0 deletions
diff --git a/sound/soc/davinci/davinci-pcm.c b/sound/soc/davinci/davinci-pcm.c
new file mode 100644
index 000000000000..6a76927c9971
--- /dev/null
+++ b/sound/soc/davinci/davinci-pcm.c
@@ -0,0 +1,389 @@
1/*
2 * ALSA PCM interface for the TI DAVINCI processor
3 *
4 * Author: Vladimir Barinov, <vbarinov@ru.mvista.com>
5 * Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/platform_device.h>
15#include <linux/slab.h>
16#include <linux/dma-mapping.h>
17
18#include <sound/core.h>
19#include <sound/pcm.h>
20#include <sound/pcm_params.h>
21#include <sound/soc.h>
22
23#include <asm/dma.h>
24
25#include "davinci-pcm.h"
26
27#define DAVINCI_PCM_DEBUG 0
28#if DAVINCI_PCM_DEBUG
29#define DPRINTK(x...) printk(KERN_DEBUG x)
30#else
31#define DPRINTK(x...)
32#endif
33
34static struct snd_pcm_hardware davinci_pcm_hardware = {
35 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
36 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
37 SNDRV_PCM_INFO_PAUSE),
38 .formats = (SNDRV_PCM_FMTBIT_S16_LE),
39 .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
40 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
41 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
42 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
43 SNDRV_PCM_RATE_KNOT),
44 .rate_min = 8000,
45 .rate_max = 96000,
46 .channels_min = 2,
47 .channels_max = 2,
48 .buffer_bytes_max = 128 * 1024,
49 .period_bytes_min = 32,
50 .period_bytes_max = 8 * 1024,
51 .periods_min = 16,
52 .periods_max = 255,
53 .fifo_size = 0,
54};
55
56struct davinci_runtime_data {
57 spinlock_t lock;
58 int period; /* current DMA period */
59 int master_lch; /* Master DMA channel */
60 int slave_lch; /* Slave DMA channel */
61 struct davinci_pcm_dma_params *params; /* DMA params */
62};
63
64static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
65{
66 struct davinci_runtime_data *prtd = substream->runtime->private_data;
67 struct snd_pcm_runtime *runtime = substream->runtime;
68 int lch = prtd->slave_lch;
69 unsigned int period_size;
70 unsigned int dma_offset;
71 dma_addr_t dma_pos;
72 dma_addr_t src, dst;
73 unsigned short src_bidx, dst_bidx;
74 unsigned int data_type;
75 unsigned int count;
76
77 period_size = snd_pcm_lib_period_bytes(substream);
78 dma_offset = prtd->period * period_size;
79 dma_pos = runtime->dma_addr + dma_offset;
80
81 DPRINTK("audio_set_dma_params_play channel = %d dma_ptr = %x "
82 "period_size=%x\n", lch, dma_pos, period_size);
83
84 data_type = prtd->params->data_type;
85 count = period_size / data_type;
86
87 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
88 src = dma_pos;
89 dst = prtd->params->dma_addr;
90 src_bidx = data_type;
91 dst_bidx = 0;
92 } else {
93 src = prtd->params->dma_addr;
94 dst = dma_pos;
95 src_bidx = 0;
96 dst_bidx = data_type;
97 }
98
99 davinci_set_dma_src_params(lch, src, INCR, W8BIT);
100 davinci_set_dma_dest_params(lch, dst, INCR, W8BIT);
101 davinci_set_dma_src_index(lch, src_bidx, 0);
102 davinci_set_dma_dest_index(lch, dst_bidx, 0);
103 davinci_set_dma_transfer_params(lch, data_type, count, 1, 0, ASYNC);
104
105 prtd->period++;
106 if (unlikely(prtd->period >= runtime->periods))
107 prtd->period = 0;
108}
109
110static void davinci_pcm_dma_irq(int lch, u16 ch_status, void *data)
111{
112 struct snd_pcm_substream *substream = data;
113 struct davinci_runtime_data *prtd = substream->runtime->private_data;
114
115 DPRINTK("lch=%d, status=0x%x\n", lch, ch_status);
116
117 if (unlikely(ch_status != DMA_COMPLETE))
118 return;
119
120 if (snd_pcm_running(substream)) {
121 snd_pcm_period_elapsed(substream);
122
123 spin_lock(&prtd->lock);
124 davinci_pcm_enqueue_dma(substream);
125 spin_unlock(&prtd->lock);
126 }
127}
128
129static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
130{
131 struct davinci_runtime_data *prtd = substream->runtime->private_data;
132 struct snd_soc_pcm_runtime *rtd = substream->private_data;
133 struct davinci_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data;
134 int tcc = TCC_ANY;
135 int ret;
136
137 if (!dma_data)
138 return -ENODEV;
139
140 prtd->params = dma_data;
141
142 /* Request master DMA channel */
143 ret = davinci_request_dma(prtd->params->channel, prtd->params->name,
144 davinci_pcm_dma_irq, substream,
145 &prtd->master_lch, &tcc, EVENTQ_0);
146 if (ret)
147 return ret;
148
149 /* Request slave DMA channel */
150 ret = davinci_request_dma(PARAM_ANY, "Link",
151 NULL, NULL, &prtd->slave_lch, &tcc, EVENTQ_0);
152 if (ret) {
153 davinci_free_dma(prtd->master_lch);
154 return ret;
155 }
156
157 /* Link slave DMA channel in loopback */
158 davinci_dma_link_lch(prtd->slave_lch, prtd->slave_lch);
159
160 return 0;
161}
162
163static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
164{
165 struct davinci_runtime_data *prtd = substream->runtime->private_data;
166 int ret = 0;
167
168 spin_lock(&prtd->lock);
169
170 switch (cmd) {
171 case SNDRV_PCM_TRIGGER_START:
172 case SNDRV_PCM_TRIGGER_RESUME:
173 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
174 davinci_start_dma(prtd->master_lch);
175 break;
176 case SNDRV_PCM_TRIGGER_STOP:
177 case SNDRV_PCM_TRIGGER_SUSPEND:
178 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
179 davinci_stop_dma(prtd->master_lch);
180 break;
181 default:
182 ret = -EINVAL;
183 break;
184 }
185
186 spin_unlock(&prtd->lock);
187
188 return ret;
189}
190
191static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
192{
193 struct davinci_runtime_data *prtd = substream->runtime->private_data;
194 struct paramentry_descriptor temp;
195
196 prtd->period = 0;
197 davinci_pcm_enqueue_dma(substream);
198
199 /* Get slave channel dma params for master channel startup */
200 davinci_get_dma_params(prtd->slave_lch, &temp);
201 davinci_set_dma_params(prtd->master_lch, &temp);
202
203 return 0;
204}
205
206static snd_pcm_uframes_t
207davinci_pcm_pointer(struct snd_pcm_substream *substream)
208{
209 struct snd_pcm_runtime *runtime = substream->runtime;
210 struct davinci_runtime_data *prtd = runtime->private_data;
211 unsigned int offset;
212 dma_addr_t count;
213 dma_addr_t src, dst;
214
215 spin_lock(&prtd->lock);
216
217 davinci_dma_getposition(prtd->master_lch, &src, &dst);
218 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
219 count = src - runtime->dma_addr;
220 else
221 count = dst - runtime->dma_addr;;
222
223 spin_unlock(&prtd->lock);
224
225 offset = bytes_to_frames(runtime, count);
226 if (offset >= runtime->buffer_size)
227 offset = 0;
228
229 return offset;
230}
231
232static int davinci_pcm_open(struct snd_pcm_substream *substream)
233{
234 struct snd_pcm_runtime *runtime = substream->runtime;
235 struct davinci_runtime_data *prtd;
236 int ret = 0;
237
238 snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
239
240 prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
241 if (prtd == NULL)
242 return -ENOMEM;
243
244 spin_lock_init(&prtd->lock);
245
246 runtime->private_data = prtd;
247
248 ret = davinci_pcm_dma_request(substream);
249 if (ret) {
250 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
251 kfree(prtd);
252 }
253
254 return ret;
255}
256
257static int davinci_pcm_close(struct snd_pcm_substream *substream)
258{
259 struct snd_pcm_runtime *runtime = substream->runtime;
260 struct davinci_runtime_data *prtd = runtime->private_data;
261
262 davinci_dma_unlink_lch(prtd->slave_lch, prtd->slave_lch);
263
264 davinci_free_dma(prtd->slave_lch);
265 davinci_free_dma(prtd->master_lch);
266
267 kfree(prtd);
268
269 return 0;
270}
271
272static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
273 struct snd_pcm_hw_params *hw_params)
274{
275 return snd_pcm_lib_malloc_pages(substream,
276 params_buffer_bytes(hw_params));
277}
278
279static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
280{
281 return snd_pcm_lib_free_pages(substream);
282}
283
284static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
285 struct vm_area_struct *vma)
286{
287 struct snd_pcm_runtime *runtime = substream->runtime;
288
289 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
290 runtime->dma_area,
291 runtime->dma_addr,
292 runtime->dma_bytes);
293}
294
295struct snd_pcm_ops davinci_pcm_ops = {
296 .open = davinci_pcm_open,
297 .close = davinci_pcm_close,
298 .ioctl = snd_pcm_lib_ioctl,
299 .hw_params = davinci_pcm_hw_params,
300 .hw_free = davinci_pcm_hw_free,
301 .prepare = davinci_pcm_prepare,
302 .trigger = davinci_pcm_trigger,
303 .pointer = davinci_pcm_pointer,
304 .mmap = davinci_pcm_mmap,
305};
306
307static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
308{
309 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
310 struct snd_dma_buffer *buf = &substream->dma_buffer;
311 size_t size = davinci_pcm_hardware.buffer_bytes_max;
312
313 buf->dev.type = SNDRV_DMA_TYPE_DEV;
314 buf->dev.dev = pcm->card->dev;
315 buf->private_data = NULL;
316 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
317 &buf->addr, GFP_KERNEL);
318
319 DPRINTK("preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
320 (void *) buf->area, (void *) buf->addr, size);
321
322 if (!buf->area)
323 return -ENOMEM;
324
325 buf->bytes = size;
326 return 0;
327}
328
329static void davinci_pcm_free(struct snd_pcm *pcm)
330{
331 struct snd_pcm_substream *substream;
332 struct snd_dma_buffer *buf;
333 int stream;
334
335 for (stream = 0; stream < 2; stream++) {
336 substream = pcm->streams[stream].substream;
337 if (!substream)
338 continue;
339
340 buf = &substream->dma_buffer;
341 if (!buf->area)
342 continue;
343
344 dma_free_writecombine(pcm->card->dev, buf->bytes,
345 buf->area, buf->addr);
346 buf->area = NULL;
347 }
348}
349
350static u64 davinci_pcm_dmamask = 0xffffffff;
351
352static int davinci_pcm_new(struct snd_card *card,
353 struct snd_soc_codec_dai *dai, struct snd_pcm *pcm)
354{
355 int ret;
356
357 if (!card->dev->dma_mask)
358 card->dev->dma_mask = &davinci_pcm_dmamask;
359 if (!card->dev->coherent_dma_mask)
360 card->dev->coherent_dma_mask = 0xffffffff;
361
362 if (dai->playback.channels_min) {
363 ret = davinci_pcm_preallocate_dma_buffer(pcm,
364 SNDRV_PCM_STREAM_PLAYBACK);
365 if (ret)
366 return ret;
367 }
368
369 if (dai->capture.channels_min) {
370 ret = davinci_pcm_preallocate_dma_buffer(pcm,
371 SNDRV_PCM_STREAM_CAPTURE);
372 if (ret)
373 return ret;
374 }
375
376 return 0;
377}
378
379struct snd_soc_platform davinci_soc_platform = {
380 .name = "davinci-audio",
381 .pcm_ops = &davinci_pcm_ops,
382 .pcm_new = davinci_pcm_new,
383 .pcm_free = davinci_pcm_free,
384};
385EXPORT_SYMBOL_GPL(davinci_soc_platform);
386
387MODULE_AUTHOR("Vladimir Barinov");
388MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
389MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-15 13:48:50 -0500