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-rw-r--r--sound/soc/imx/mx1_mx2-pcm.c488
1 files changed, 0 insertions, 488 deletions
diff --git a/sound/soc/imx/mx1_mx2-pcm.c b/sound/soc/imx/mx1_mx2-pcm.c
deleted file mode 100644
index bffffcd5ff34..000000000000
--- a/sound/soc/imx/mx1_mx2-pcm.c
+++ /dev/null
@@ -1,488 +0,0 @@
1/*
2 * mx1_mx2-pcm.c -- ALSA SoC interface for Freescale i.MX1x, i.MX2x CPUs
3 *
4 * Copyright 2009 Vista Silicon S.L.
5 * Author: Javier Martin
6 * javier.martin@vista-silicon.com
7 *
8 * Based on mxc-pcm.c by Liam Girdwood.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 *
15 */
16
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/platform_device.h>
20#include <linux/slab.h>
21#include <linux/dma-mapping.h>
22#include <sound/core.h>
23#include <sound/pcm.h>
24#include <sound/pcm_params.h>
25#include <sound/soc.h>
26#include <asm/dma.h>
27#include <mach/hardware.h>
28#include <mach/dma-mx1-mx2.h>
29
30#include "mx1_mx2-pcm.h"
31
32
33static const struct snd_pcm_hardware mx1_mx2_pcm_hardware = {
34 .info = (SNDRV_PCM_INFO_INTERLEAVED |
35 SNDRV_PCM_INFO_BLOCK_TRANSFER |
36 SNDRV_PCM_INFO_MMAP |
37 SNDRV_PCM_INFO_MMAP_VALID),
38 .formats = SNDRV_PCM_FMTBIT_S16_LE,
39 .buffer_bytes_max = 32 * 1024,
40 .period_bytes_min = 64,
41 .period_bytes_max = 8 * 1024,
42 .periods_min = 2,
43 .periods_max = 255,
44 .fifo_size = 0,
45};
46
47struct mx1_mx2_runtime_data {
48 int dma_ch;
49 int active;
50 unsigned int period;
51 unsigned int periods;
52 int tx_spin;
53 spinlock_t dma_lock;
54 struct mx1_mx2_pcm_dma_params *dma_params;
55};
56
57
58/**
59 * This function stops the current dma transfer for playback
60 * and clears the dma pointers.
61 *
62 * @param substream pointer to the structure of the current stream.
63 *
64 */
65static int audio_stop_dma(struct snd_pcm_substream *substream)
66{
67 struct snd_pcm_runtime *runtime = substream->runtime;
68 struct mx1_mx2_runtime_data *prtd = runtime->private_data;
69 unsigned long flags;
70
71 spin_lock_irqsave(&prtd->dma_lock, flags);
72
73 pr_debug("%s\n", __func__);
74
75 prtd->active = 0;
76 prtd->period = 0;
77 prtd->periods = 0;
78
79 /* this stops the dma channel and clears the buffer ptrs */
80
81 imx_dma_disable(prtd->dma_ch);
82
83 spin_unlock_irqrestore(&prtd->dma_lock, flags);
84
85 return 0;
86}
87
88/**
89 * This function is called whenever a new audio block needs to be
90 * transferred to the codec. The function receives the address and the size
91 * of the new block and start a new DMA transfer.
92 *
93 * @param substream pointer to the structure of the current stream.
94 *
95 */
96static int dma_new_period(struct snd_pcm_substream *substream)
97{
98 struct snd_pcm_runtime *runtime = substream->runtime;
99 struct mx1_mx2_runtime_data *prtd = runtime->private_data;
100 unsigned int dma_size;
101 unsigned int offset;
102 int ret = 0;
103 dma_addr_t mem_addr;
104 unsigned int dev_addr;
105
106 if (prtd->active) {
107 dma_size = frames_to_bytes(runtime, runtime->period_size);
108 offset = dma_size * prtd->period;
109
110 pr_debug("%s: period (%d) out of (%d)\n", __func__,
111 prtd->period,
112 runtime->periods);
113 pr_debug("period_size %d frames\n offset %d bytes\n",
114 (unsigned int)runtime->period_size,
115 offset);
116 pr_debug("dma_size %d bytes\n", dma_size);
117
118 snd_BUG_ON(dma_size > mx1_mx2_pcm_hardware.period_bytes_max);
119
120 mem_addr = (dma_addr_t)(runtime->dma_addr + offset);
121 dev_addr = prtd->dma_params->per_address;
122 pr_debug("%s: mem_addr is %x\n dev_addr is %x\n",
123 __func__, mem_addr, dev_addr);
124
125 ret = imx_dma_setup_single(prtd->dma_ch, mem_addr,
126 dma_size, dev_addr,
127 prtd->dma_params->transfer_type);
128 if (ret < 0) {
129 printk(KERN_ERR "Error %d configuring DMA\n", ret);
130 return ret;
131 }
132 imx_dma_enable(prtd->dma_ch);
133
134 pr_debug("%s: transfer enabled\nmem_addr = %x\n",
135 __func__, (unsigned int) mem_addr);
136 pr_debug("dev_addr = %x\ndma_size = %d\n",
137 (unsigned int) dev_addr, dma_size);
138
139 prtd->tx_spin = 1; /* FGA little trick to retrieve DMA pos */
140 prtd->period++;
141 prtd->period %= runtime->periods;
142 }
143 return ret;
144}
145
146
147/**
148 * This is a callback which will be called
149 * when a TX transfer finishes. The call occurs
150 * in interrupt context.
151 *
152 * @param dat pointer to the structure of the current stream.
153 *
154 */
155static void audio_dma_irq(int channel, void *data)
156{
157 struct snd_pcm_substream *substream;
158 struct snd_pcm_runtime *runtime;
159 struct mx1_mx2_runtime_data *prtd;
160 unsigned int dma_size;
161 unsigned int previous_period;
162 unsigned int offset;
163
164 substream = data;
165 runtime = substream->runtime;
166 prtd = runtime->private_data;
167 previous_period = prtd->periods;
168 dma_size = frames_to_bytes(runtime, runtime->period_size);
169 offset = dma_size * previous_period;
170
171 prtd->tx_spin = 0;
172 prtd->periods++;
173 prtd->periods %= runtime->periods;
174
175 pr_debug("%s: irq per %d offset %x\n", __func__, prtd->periods, offset);
176
177 /*
178 * If we are getting a callback for an active stream then we inform
179 * the PCM middle layer we've finished a period
180 */
181 if (prtd->active)
182 snd_pcm_period_elapsed(substream);
183
184 /*
185 * Trig next DMA transfer
186 */
187 dma_new_period(substream);
188}
189
190/**
191 * This function configures the hardware to allow audio
192 * playback operations. It is called by ALSA framework.
193 *
194 * @param substream pointer to the structure of the current stream.
195 *
196 * @return 0 on success, -1 otherwise.
197 */
198static int
199snd_mx1_mx2_prepare(struct snd_pcm_substream *substream)
200{
201 struct snd_pcm_runtime *runtime = substream->runtime;
202 struct mx1_mx2_runtime_data *prtd = runtime->private_data;
203
204 prtd->period = 0;
205 prtd->periods = 0;
206
207 return 0;
208}
209
210static int mx1_mx2_pcm_hw_params(struct snd_pcm_substream *substream,
211 struct snd_pcm_hw_params *hw_params)
212{
213 struct snd_pcm_runtime *runtime = substream->runtime;
214 int ret;
215
216 ret = snd_pcm_lib_malloc_pages(substream,
217 params_buffer_bytes(hw_params));
218 if (ret < 0) {
219 printk(KERN_ERR "%s: Error %d failed to malloc pcm pages \n",
220 __func__, ret);
221 return ret;
222 }
223
224 pr_debug("%s: snd_imx1_mx2_audio_hw_params runtime->dma_addr 0x(%x)\n",
225 __func__, (unsigned int)runtime->dma_addr);
226 pr_debug("%s: snd_imx1_mx2_audio_hw_params runtime->dma_area 0x(%x)\n",
227 __func__, (unsigned int)runtime->dma_area);
228 pr_debug("%s: snd_imx1_mx2_audio_hw_params runtime->dma_bytes 0x(%x)\n",
229 __func__, (unsigned int)runtime->dma_bytes);
230
231 return ret;
232}
233
234static int mx1_mx2_pcm_hw_free(struct snd_pcm_substream *substream)
235{
236 struct snd_pcm_runtime *runtime = substream->runtime;
237 struct mx1_mx2_runtime_data *prtd = runtime->private_data;
238
239 imx_dma_free(prtd->dma_ch);
240
241 snd_pcm_lib_free_pages(substream);
242
243 return 0;
244}
245
246static int mx1_mx2_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
247{
248 struct mx1_mx2_runtime_data *prtd = substream->runtime->private_data;
249 int ret = 0;
250
251 switch (cmd) {
252 case SNDRV_PCM_TRIGGER_START:
253 prtd->tx_spin = 0;
254 /* requested stream startup */
255 prtd->active = 1;
256 pr_debug("%s: starting dma_new_period\n", __func__);
257 ret = dma_new_period(substream);
258 break;
259 case SNDRV_PCM_TRIGGER_STOP:
260 /* requested stream shutdown */
261 pr_debug("%s: stopping dma transfer\n", __func__);
262 ret = audio_stop_dma(substream);
263 break;
264 default:
265 ret = -EINVAL;
266 break;
267 }
268
269 return ret;
270}
271
272static snd_pcm_uframes_t
273mx1_mx2_pcm_pointer(struct snd_pcm_substream *substream)
274{
275 struct snd_pcm_runtime *runtime = substream->runtime;
276 struct mx1_mx2_runtime_data *prtd = runtime->private_data;
277 unsigned int offset = 0;
278
279 /* tx_spin value is used here to check if a transfer is active */
280 if (prtd->tx_spin) {
281 offset = (runtime->period_size * (prtd->periods)) +
282 (runtime->period_size >> 1);
283 if (offset >= runtime->buffer_size)
284 offset = runtime->period_size >> 1;
285 } else {
286 offset = (runtime->period_size * (prtd->periods));
287 if (offset >= runtime->buffer_size)
288 offset = 0;
289 }
290 pr_debug("%s: pointer offset %x\n", __func__, offset);
291
292 return offset;
293}
294
295static int mx1_mx2_pcm_open(struct snd_pcm_substream *substream)
296{
297 struct snd_pcm_runtime *runtime = substream->runtime;
298 struct mx1_mx2_runtime_data *prtd;
299 struct snd_soc_pcm_runtime *rtd = substream->private_data;
300 struct mx1_mx2_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data;
301 int ret;
302
303 snd_soc_set_runtime_hwparams(substream, &mx1_mx2_pcm_hardware);
304
305 ret = snd_pcm_hw_constraint_integer(runtime,
306 SNDRV_PCM_HW_PARAM_PERIODS);
307 if (ret < 0)
308 return ret;
309
310 prtd = kzalloc(sizeof(struct mx1_mx2_runtime_data), GFP_KERNEL);
311 if (prtd == NULL) {
312 ret = -ENOMEM;
313 goto out;
314 }
315
316 runtime->private_data = prtd;
317
318 if (!dma_data)
319 return -ENODEV;
320
321 prtd->dma_params = dma_data;
322
323 pr_debug("%s: Requesting dma channel (%s)\n", __func__,
324 prtd->dma_params->name);
325 ret = imx_dma_request_by_prio(prtd->dma_params->name, DMA_PRIO_HIGH);
326 if (ret < 0) {
327 printk(KERN_ERR "Error %d requesting dma channel\n", ret);
328 return ret;
329 }
330 prtd->dma_ch = ret;
331 imx_dma_config_burstlen(prtd->dma_ch,
332 prtd->dma_params->watermark_level);
333
334 ret = imx_dma_config_channel(prtd->dma_ch,
335 prtd->dma_params->per_config,
336 prtd->dma_params->mem_config,
337 prtd->dma_params->event_id, 0);
338
339 if (ret) {
340 pr_debug(KERN_ERR "Error %d configuring dma channel %d\n",
341 ret, prtd->dma_ch);
342 return ret;
343 }
344
345 pr_debug("%s: Setting tx dma callback function\n", __func__);
346 ret = imx_dma_setup_handlers(prtd->dma_ch,
347 audio_dma_irq, NULL,
348 (void *)substream);
349 if (ret < 0) {
350 printk(KERN_ERR "Error %d setting dma callback function\n", ret);
351 return ret;
352 }
353 return 0;
354
355 out:
356 return ret;
357}
358
359static int mx1_mx2_pcm_close(struct snd_pcm_substream *substream)
360{
361 struct snd_pcm_runtime *runtime = substream->runtime;
362 struct mx1_mx2_runtime_data *prtd = runtime->private_data;
363
364 kfree(prtd);
365
366 return 0;
367}
368
369static int mx1_mx2_pcm_mmap(struct snd_pcm_substream *substream,
370 struct vm_area_struct *vma)
371{
372 struct snd_pcm_runtime *runtime = substream->runtime;
373 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
374 runtime->dma_area,
375 runtime->dma_addr,
376 runtime->dma_bytes);
377}
378
379static struct snd_pcm_ops mx1_mx2_pcm_ops = {
380 .open = mx1_mx2_pcm_open,
381 .close = mx1_mx2_pcm_close,
382 .ioctl = snd_pcm_lib_ioctl,
383 .hw_params = mx1_mx2_pcm_hw_params,
384 .hw_free = mx1_mx2_pcm_hw_free,
385 .prepare = snd_mx1_mx2_prepare,
386 .trigger = mx1_mx2_pcm_trigger,
387 .pointer = mx1_mx2_pcm_pointer,
388 .mmap = mx1_mx2_pcm_mmap,
389};
390
391static u64 mx1_mx2_pcm_dmamask = 0xffffffff;
392
393static int mx1_mx2_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
394{
395 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
396 struct snd_dma_buffer *buf = &substream->dma_buffer;
397 size_t size = mx1_mx2_pcm_hardware.buffer_bytes_max;
398 buf->dev.type = SNDRV_DMA_TYPE_DEV;
399 buf->dev.dev = pcm->card->dev;
400 buf->private_data = NULL;
401
402 /* Reserve uncached-buffered memory area for DMA */
403 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
404 &buf->addr, GFP_KERNEL);
405
406 pr_debug("%s: preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
407 __func__, (void *) buf->area, (void *) buf->addr, size);
408
409 if (!buf->area)
410 return -ENOMEM;
411
412 buf->bytes = size;
413 return 0;
414}
415
416static void mx1_mx2_pcm_free_dma_buffers(struct snd_pcm *pcm)
417{
418 struct snd_pcm_substream *substream;
419 struct snd_dma_buffer *buf;
420 int stream;
421
422 for (stream = 0; stream < 2; stream++) {
423 substream = pcm->streams[stream].substream;
424 if (!substream)
425 continue;
426
427 buf = &substream->dma_buffer;
428 if (!buf->area)
429 continue;
430
431 dma_free_writecombine(pcm->card->dev, buf->bytes,
432 buf->area, buf->addr);
433 buf->area = NULL;
434 }
435}
436
437static int mx1_mx2_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
438 struct snd_pcm *pcm)
439{
440 int ret = 0;
441
442 if (!card->dev->dma_mask)
443 card->dev->dma_mask = &mx1_mx2_pcm_dmamask;
444 if (!card->dev->coherent_dma_mask)
445 card->dev->coherent_dma_mask = 0xffffffff;
446
447 if (dai->playback.channels_min) {
448 ret = mx1_mx2_pcm_preallocate_dma_buffer(pcm,
449 SNDRV_PCM_STREAM_PLAYBACK);
450 pr_debug("%s: preallocate playback buffer\n", __func__);
451 if (ret)
452 goto out;
453 }
454
455 if (dai->capture.channels_min) {
456 ret = mx1_mx2_pcm_preallocate_dma_buffer(pcm,
457 SNDRV_PCM_STREAM_CAPTURE);
458 pr_debug("%s: preallocate capture buffer\n", __func__);
459 if (ret)
460 goto out;
461 }
462 out:
463 return ret;
464}
465
466struct snd_soc_platform mx1_mx2_soc_platform = {
467 .name = "mx1_mx2-audio",
468 .pcm_ops = &mx1_mx2_pcm_ops,
469 .pcm_new = mx1_mx2_pcm_new,
470 .pcm_free = mx1_mx2_pcm_free_dma_buffers,
471};
472EXPORT_SYMBOL_GPL(mx1_mx2_soc_platform);
473
474static int __init mx1_mx2_soc_platform_init(void)
475{
476 return snd_soc_register_platform(&mx1_mx2_soc_platform);
477}
478module_init(mx1_mx2_soc_platform_init);
479
480static void __exit mx1_mx2_soc_platform_exit(void)
481{
482 snd_soc_unregister_platform(&mx1_mx2_soc_platform);
483}
484module_exit(mx1_mx2_soc_platform_exit);
485
486MODULE_AUTHOR("Javier Martin, javier.martin@vista-silicon.com");
487MODULE_DESCRIPTION("Freescale i.MX2x, i.MX1x PCM DMA module");
488MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-13 04:36:23 -0500