2 * ALSA PCM interface for the Stetch s6000 family
4 * Author: Daniel Gloeckner, <dg@emlix.com>
5 * Copyright: (C) 2009 emlix GmbH <info@emlix.com>
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.
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 #include <linux/interrupt.h>
19 #include <sound/core.h>
20 #include <sound/pcm.h>
21 #include <sound/pcm_params.h>
22 #include <sound/soc.h>
25 #include <variant/dmac.h>
27 #include "s6000-pcm.h"
29 #define S6_PCM_PREALLOCATE_SIZE (96 * 1024)
30 #define S6_PCM_PREALLOCATE_MAX (2048 * 1024)
32 static struct snd_pcm_hardware s6000_pcm_hardware = {
33 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
34 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
35 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_JOINT_DUPLEX),
36 .formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE),
37 .rates = (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
38 SNDRV_PCM_RATE_8000_192000),
43 .buffer_bytes_max = 0x7ffffff0,
44 .period_bytes_min = 16,
45 .period_bytes_max = 0xfffff0,
47 .periods_max = 1024, /* no limit */
51 struct s6000_runtime_data {
53 int period; /* current DMA period */
56 static void s6000_pcm_enqueue_dma(struct snd_pcm_substream *substream)
58 struct snd_pcm_runtime *runtime = substream->runtime;
59 struct s6000_runtime_data *prtd = runtime->private_data;
60 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
61 struct s6000_pcm_dma_params *par;
63 unsigned int period_size;
64 unsigned int dma_offset;
68 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
70 period_size = snd_pcm_lib_period_bytes(substream);
71 dma_offset = prtd->period * period_size;
72 dma_pos = runtime->dma_addr + dma_offset;
74 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
77 channel = par->dma_out;
81 channel = par->dma_in;
84 if (!s6dmac_channel_enabled(DMA_MASK_DMAC(channel),
85 DMA_INDEX_CHNL(channel)))
88 if (s6dmac_fifo_full(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel))) {
89 printk(KERN_ERR "s6000-pcm: fifo full\n");
93 BUG_ON(period_size & 15);
94 s6dmac_put_fifo(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel),
95 src, dst, period_size);
98 if (unlikely(prtd->period >= runtime->periods))
102 static irqreturn_t s6000_pcm_irq(int irq, void *data)
104 struct snd_pcm *pcm = data;
105 struct snd_soc_pcm_runtime *runtime = pcm->private_data;
106 struct s6000_runtime_data *prtd;
107 unsigned int has_xrun;
108 int i, ret = IRQ_NONE;
110 for (i = 0; i < 2; ++i) {
111 struct snd_pcm_substream *substream = pcm->streams[i].substream;
112 struct s6000_pcm_dma_params *params =
113 snd_soc_dai_get_dma_data(runtime->cpu_dai, substream);
115 unsigned int pending;
117 if (substream == SNDRV_PCM_STREAM_PLAYBACK)
118 channel = params->dma_out;
120 channel = params->dma_in;
122 has_xrun = params->check_xrun(runtime->cpu_dai);
127 if (unlikely(has_xrun & (1 << i)) &&
128 substream->runtime &&
129 snd_pcm_running(substream)) {
130 dev_dbg(pcm->dev, "xrun\n");
131 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
135 pending = s6dmac_int_sources(DMA_MASK_DMAC(channel),
136 DMA_INDEX_CHNL(channel));
140 if (likely(substream->runtime &&
141 snd_pcm_running(substream))) {
142 snd_pcm_period_elapsed(substream);
143 dev_dbg(pcm->dev, "period elapsed %x %x\n",
144 s6dmac_cur_src(DMA_MASK_DMAC(channel),
145 DMA_INDEX_CHNL(channel)),
146 s6dmac_cur_dst(DMA_MASK_DMAC(channel),
147 DMA_INDEX_CHNL(channel)));
148 prtd = substream->runtime->private_data;
149 spin_lock(&prtd->lock);
150 s6000_pcm_enqueue_dma(substream);
151 spin_unlock(&prtd->lock);
155 if (unlikely(pending & ~7)) {
156 if (pending & (1 << 3))
158 "s6000-pcm: DMA %x Underflow\n",
160 if (pending & (1 << 4))
162 "s6000-pcm: DMA %x Overflow\n",
166 "s6000-pcm: DMA %x Master Error "
168 channel, pending >> 5);
176 static int s6000_pcm_start(struct snd_pcm_substream *substream)
178 struct s6000_runtime_data *prtd = substream->runtime->private_data;
179 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
180 struct s6000_pcm_dma_params *par;
185 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
187 spin_lock_irqsave(&prtd->lock, flags);
189 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
196 s6dmac_enable_chan(DMA_MASK_DMAC(dma), DMA_INDEX_CHNL(dma),
197 1 /* priority 1 (0 is max) */,
198 0 /* peripheral requests w/o xfer length mode */,
199 srcinc /* source address increment */,
200 srcinc^1 /* destination address increment */,
201 0 /* chunksize 0 (skip impossible on this dma) */,
202 0 /* source skip after chunk (impossible) */,
203 0 /* destination skip after chunk (impossible) */,
204 4 /* 16 byte burst size */,
205 -1 /* don't conserve bandwidth */,
206 0 /* low watermark irq descriptor threshold */,
207 0 /* disable hardware timestamps */,
208 1 /* enable channel */);
210 s6000_pcm_enqueue_dma(substream);
211 s6000_pcm_enqueue_dma(substream);
213 spin_unlock_irqrestore(&prtd->lock, flags);
218 static int s6000_pcm_stop(struct snd_pcm_substream *substream)
220 struct s6000_runtime_data *prtd = substream->runtime->private_data;
221 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
222 struct s6000_pcm_dma_params *par;
226 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
228 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
229 channel = par->dma_out;
231 channel = par->dma_in;
233 s6dmac_set_terminal_count(DMA_MASK_DMAC(channel),
234 DMA_INDEX_CHNL(channel), 0);
236 spin_lock_irqsave(&prtd->lock, flags);
238 s6dmac_disable_chan(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel));
240 spin_unlock_irqrestore(&prtd->lock, flags);
245 static int s6000_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
247 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
248 struct s6000_pcm_dma_params *par;
251 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
253 ret = par->trigger(substream, cmd, 0);
258 case SNDRV_PCM_TRIGGER_START:
259 case SNDRV_PCM_TRIGGER_RESUME:
260 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
261 ret = s6000_pcm_start(substream);
263 case SNDRV_PCM_TRIGGER_STOP:
264 case SNDRV_PCM_TRIGGER_SUSPEND:
265 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
266 ret = s6000_pcm_stop(substream);
274 return par->trigger(substream, cmd, 1);
277 static int s6000_pcm_prepare(struct snd_pcm_substream *substream)
279 struct s6000_runtime_data *prtd = substream->runtime->private_data;
286 static snd_pcm_uframes_t s6000_pcm_pointer(struct snd_pcm_substream *substream)
288 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
289 struct s6000_pcm_dma_params *par;
290 struct snd_pcm_runtime *runtime = substream->runtime;
291 struct s6000_runtime_data *prtd = runtime->private_data;
296 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
298 spin_lock_irqsave(&prtd->lock, flags);
300 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
301 count = s6dmac_cur_src(DMA_MASK_DMAC(par->dma_out),
302 DMA_INDEX_CHNL(par->dma_out));
304 count = s6dmac_cur_dst(DMA_MASK_DMAC(par->dma_in),
305 DMA_INDEX_CHNL(par->dma_in));
307 count -= runtime->dma_addr;
309 spin_unlock_irqrestore(&prtd->lock, flags);
311 offset = bytes_to_frames(runtime, count);
312 if (unlikely(offset >= runtime->buffer_size))
318 static int s6000_pcm_open(struct snd_pcm_substream *substream)
320 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
321 struct s6000_pcm_dma_params *par;
322 struct snd_pcm_runtime *runtime = substream->runtime;
323 struct s6000_runtime_data *prtd;
326 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
327 snd_soc_set_runtime_hwparams(substream, &s6000_pcm_hardware);
329 ret = snd_pcm_hw_constraint_step(runtime, 0,
330 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16);
333 ret = snd_pcm_hw_constraint_step(runtime, 0,
334 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 16);
337 ret = snd_pcm_hw_constraint_integer(runtime,
338 SNDRV_PCM_HW_PARAM_PERIODS);
342 if (par->same_rate) {
344 spin_lock(&par->lock); /* needed? */
346 spin_unlock(&par->lock);
348 ret = snd_pcm_hw_constraint_minmax(runtime,
349 SNDRV_PCM_HW_PARAM_RATE,
356 prtd = kzalloc(sizeof(struct s6000_runtime_data), GFP_KERNEL);
360 spin_lock_init(&prtd->lock);
362 runtime->private_data = prtd;
367 static int s6000_pcm_close(struct snd_pcm_substream *substream)
369 struct snd_pcm_runtime *runtime = substream->runtime;
370 struct s6000_runtime_data *prtd = runtime->private_data;
377 static int s6000_pcm_hw_params(struct snd_pcm_substream *substream,
378 struct snd_pcm_hw_params *hw_params)
380 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
381 struct s6000_pcm_dma_params *par;
383 ret = snd_pcm_lib_malloc_pages(substream,
384 params_buffer_bytes(hw_params));
386 printk(KERN_WARNING "s6000-pcm: allocation of memory failed\n");
390 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
392 if (par->same_rate) {
393 spin_lock(&par->lock);
394 if (par->rate == -1 ||
395 !(par->in_use & ~(1 << substream->stream))) {
396 par->rate = params_rate(hw_params);
397 par->in_use |= 1 << substream->stream;
398 } else if (params_rate(hw_params) != par->rate) {
399 snd_pcm_lib_free_pages(substream);
400 par->in_use &= ~(1 << substream->stream);
403 spin_unlock(&par->lock);
408 static int s6000_pcm_hw_free(struct snd_pcm_substream *substream)
410 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
411 struct s6000_pcm_dma_params *par =
412 snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
414 spin_lock(&par->lock);
415 par->in_use &= ~(1 << substream->stream);
418 spin_unlock(&par->lock);
420 return snd_pcm_lib_free_pages(substream);
423 static struct snd_pcm_ops s6000_pcm_ops = {
424 .open = s6000_pcm_open,
425 .close = s6000_pcm_close,
426 .ioctl = snd_pcm_lib_ioctl,
427 .hw_params = s6000_pcm_hw_params,
428 .hw_free = s6000_pcm_hw_free,
429 .trigger = s6000_pcm_trigger,
430 .prepare = s6000_pcm_prepare,
431 .pointer = s6000_pcm_pointer,
434 static void s6000_pcm_free(struct snd_pcm *pcm)
436 struct snd_soc_pcm_runtime *runtime = pcm->private_data;
437 struct s6000_pcm_dma_params *params =
438 snd_soc_dai_get_dma_data(runtime->cpu_dai, pcm->streams[0].substream);
440 free_irq(params->irq, pcm);
441 snd_pcm_lib_preallocate_free_for_all(pcm);
444 static u64 s6000_pcm_dmamask = DMA_BIT_MASK(32);
446 static int s6000_pcm_new(struct snd_card *card,
447 struct snd_soc_dai *dai, struct snd_pcm *pcm)
449 struct snd_soc_pcm_runtime *runtime = pcm->private_data;
450 struct s6000_pcm_dma_params *params;
453 params = snd_soc_dai_get_dma_data(runtime->cpu_dai,
454 pcm->streams[0].substream);
456 if (!card->dev->dma_mask)
457 card->dev->dma_mask = &s6000_pcm_dmamask;
458 if (!card->dev->coherent_dma_mask)
459 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
461 if (params->dma_in) {
462 s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_in),
463 DMA_INDEX_CHNL(params->dma_in));
464 s6dmac_int_sources(DMA_MASK_DMAC(params->dma_in),
465 DMA_INDEX_CHNL(params->dma_in));
468 if (params->dma_out) {
469 s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_out),
470 DMA_INDEX_CHNL(params->dma_out));
471 s6dmac_int_sources(DMA_MASK_DMAC(params->dma_out),
472 DMA_INDEX_CHNL(params->dma_out));
475 res = request_irq(params->irq, s6000_pcm_irq, IRQF_SHARED,
476 s6000_soc_platform.name, pcm);
478 printk(KERN_ERR "s6000-pcm couldn't get IRQ\n");
482 res = snd_pcm_lib_preallocate_pages_for_all(pcm,
485 S6_PCM_PREALLOCATE_SIZE,
486 S6_PCM_PREALLOCATE_MAX);
488 printk(KERN_WARNING "s6000-pcm: preallocation failed\n");
490 spin_lock_init(¶ms->lock);
496 static struct snd_soc_platform_driver s6000_soc_platform = {
497 .ops = &s6000_pcm_ops,
498 .pcm_new = s6000_pcm_new,
499 .pcm_free = s6000_pcm_free,
502 static int __devinit s6000_soc_platform_probe(struct platform_device *pdev)
504 return snd_soc_register_platform(&pdev->dev, &s6000_soc_platform);
507 static int __devexit s6000_soc_platform_remove(struct platform_device *pdev)
509 snd_soc_unregister_platform(&pdev->dev);
513 static struct platform_driver s6000_pcm_driver = {
515 .name = "s6000-pcm-audio",
516 .owner = THIS_MODULE,
519 .probe = s6000_soc_platform_probe,
520 .remove = __devexit_p(s6000_soc_platform_remove),
523 static int __init snd_s6000_pcm_init(void)
525 return platform_driver_register(&s6000_pcm_driver);
527 module_init(snd_s6000_pcm_init);
529 static void __exit snd_s6000_pcm_exit(void)
531 platform_driver_unregister(&s6000_pcm_driver);
533 module_exit(snd_s6000_pcm_exit);
535 MODULE_AUTHOR("Daniel Gloeckner");
536 MODULE_DESCRIPTION("Stretch s6000 family PCM DMA module");
537 MODULE_LICENSE("GPL");