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 if (WARN_ON(period_size & 15))
95 s6dmac_put_fifo(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel),
96 src, dst, period_size);
99 if (unlikely(prtd->period >= runtime->periods))
103 static irqreturn_t s6000_pcm_irq(int irq, void *data)
105 struct snd_pcm *pcm = data;
106 struct snd_soc_pcm_runtime *runtime = pcm->private_data;
107 struct s6000_runtime_data *prtd;
108 unsigned int has_xrun;
109 int i, ret = IRQ_NONE;
111 for (i = 0; i < 2; ++i) {
112 struct snd_pcm_substream *substream = pcm->streams[i].substream;
113 struct s6000_pcm_dma_params *params =
114 snd_soc_dai_get_dma_data(runtime->cpu_dai, substream);
116 unsigned int pending;
118 if (substream == SNDRV_PCM_STREAM_PLAYBACK)
119 channel = params->dma_out;
121 channel = params->dma_in;
123 has_xrun = params->check_xrun(runtime->cpu_dai);
128 if (unlikely(has_xrun & (1 << i)) &&
129 substream->runtime &&
130 snd_pcm_running(substream)) {
131 dev_dbg(pcm->dev, "xrun\n");
132 snd_pcm_stream_lock(substream);
133 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
134 snd_pcm_stream_unlock(substream);
138 pending = s6dmac_int_sources(DMA_MASK_DMAC(channel),
139 DMA_INDEX_CHNL(channel));
143 if (likely(substream->runtime &&
144 snd_pcm_running(substream))) {
145 snd_pcm_period_elapsed(substream);
146 dev_dbg(pcm->dev, "period elapsed %x %x\n",
147 s6dmac_cur_src(DMA_MASK_DMAC(channel),
148 DMA_INDEX_CHNL(channel)),
149 s6dmac_cur_dst(DMA_MASK_DMAC(channel),
150 DMA_INDEX_CHNL(channel)));
151 prtd = substream->runtime->private_data;
152 spin_lock(&prtd->lock);
153 s6000_pcm_enqueue_dma(substream);
154 spin_unlock(&prtd->lock);
158 if (unlikely(pending & ~7)) {
159 if (pending & (1 << 3))
161 "s6000-pcm: DMA %x Underflow\n",
163 if (pending & (1 << 4))
165 "s6000-pcm: DMA %x Overflow\n",
169 "s6000-pcm: DMA %x Master Error "
171 channel, pending >> 5);
179 static int s6000_pcm_start(struct snd_pcm_substream *substream)
181 struct s6000_runtime_data *prtd = substream->runtime->private_data;
182 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
183 struct s6000_pcm_dma_params *par;
188 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
190 spin_lock_irqsave(&prtd->lock, flags);
192 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
199 s6dmac_enable_chan(DMA_MASK_DMAC(dma), DMA_INDEX_CHNL(dma),
200 1 /* priority 1 (0 is max) */,
201 0 /* peripheral requests w/o xfer length mode */,
202 srcinc /* source address increment */,
203 srcinc^1 /* destination address increment */,
204 0 /* chunksize 0 (skip impossible on this dma) */,
205 0 /* source skip after chunk (impossible) */,
206 0 /* destination skip after chunk (impossible) */,
207 4 /* 16 byte burst size */,
208 -1 /* don't conserve bandwidth */,
209 0 /* low watermark irq descriptor threshold */,
210 0 /* disable hardware timestamps */,
211 1 /* enable channel */);
213 s6000_pcm_enqueue_dma(substream);
214 s6000_pcm_enqueue_dma(substream);
216 spin_unlock_irqrestore(&prtd->lock, flags);
221 static int s6000_pcm_stop(struct snd_pcm_substream *substream)
223 struct s6000_runtime_data *prtd = substream->runtime->private_data;
224 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
225 struct s6000_pcm_dma_params *par;
229 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
231 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
232 channel = par->dma_out;
234 channel = par->dma_in;
236 s6dmac_set_terminal_count(DMA_MASK_DMAC(channel),
237 DMA_INDEX_CHNL(channel), 0);
239 spin_lock_irqsave(&prtd->lock, flags);
241 s6dmac_disable_chan(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel));
243 spin_unlock_irqrestore(&prtd->lock, flags);
248 static int s6000_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
250 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
251 struct s6000_pcm_dma_params *par;
254 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
256 ret = par->trigger(substream, cmd, 0);
261 case SNDRV_PCM_TRIGGER_START:
262 case SNDRV_PCM_TRIGGER_RESUME:
263 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
264 ret = s6000_pcm_start(substream);
266 case SNDRV_PCM_TRIGGER_STOP:
267 case SNDRV_PCM_TRIGGER_SUSPEND:
268 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
269 ret = s6000_pcm_stop(substream);
277 return par->trigger(substream, cmd, 1);
280 static int s6000_pcm_prepare(struct snd_pcm_substream *substream)
282 struct s6000_runtime_data *prtd = substream->runtime->private_data;
289 static snd_pcm_uframes_t s6000_pcm_pointer(struct snd_pcm_substream *substream)
291 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
292 struct s6000_pcm_dma_params *par;
293 struct snd_pcm_runtime *runtime = substream->runtime;
294 struct s6000_runtime_data *prtd = runtime->private_data;
299 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
301 spin_lock_irqsave(&prtd->lock, flags);
303 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
304 count = s6dmac_cur_src(DMA_MASK_DMAC(par->dma_out),
305 DMA_INDEX_CHNL(par->dma_out));
307 count = s6dmac_cur_dst(DMA_MASK_DMAC(par->dma_in),
308 DMA_INDEX_CHNL(par->dma_in));
310 count -= runtime->dma_addr;
312 spin_unlock_irqrestore(&prtd->lock, flags);
314 offset = bytes_to_frames(runtime, count);
315 if (unlikely(offset >= runtime->buffer_size))
321 static int s6000_pcm_open(struct snd_pcm_substream *substream)
323 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
324 struct s6000_pcm_dma_params *par;
325 struct snd_pcm_runtime *runtime = substream->runtime;
326 struct s6000_runtime_data *prtd;
329 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
330 snd_soc_set_runtime_hwparams(substream, &s6000_pcm_hardware);
332 ret = snd_pcm_hw_constraint_step(runtime, 0,
333 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16);
336 ret = snd_pcm_hw_constraint_step(runtime, 0,
337 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 16);
340 ret = snd_pcm_hw_constraint_integer(runtime,
341 SNDRV_PCM_HW_PARAM_PERIODS);
345 if (par->same_rate) {
347 spin_lock(&par->lock); /* needed? */
349 spin_unlock(&par->lock);
351 ret = snd_pcm_hw_constraint_minmax(runtime,
352 SNDRV_PCM_HW_PARAM_RATE,
359 prtd = kzalloc(sizeof(struct s6000_runtime_data), GFP_KERNEL);
363 spin_lock_init(&prtd->lock);
365 runtime->private_data = prtd;
370 static int s6000_pcm_close(struct snd_pcm_substream *substream)
372 struct snd_pcm_runtime *runtime = substream->runtime;
373 struct s6000_runtime_data *prtd = runtime->private_data;
380 static int s6000_pcm_hw_params(struct snd_pcm_substream *substream,
381 struct snd_pcm_hw_params *hw_params)
383 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
384 struct s6000_pcm_dma_params *par;
386 ret = snd_pcm_lib_malloc_pages(substream,
387 params_buffer_bytes(hw_params));
389 printk(KERN_WARNING "s6000-pcm: allocation of memory failed\n");
393 par = snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
395 if (par->same_rate) {
396 spin_lock(&par->lock);
397 if (par->rate == -1 ||
398 !(par->in_use & ~(1 << substream->stream))) {
399 par->rate = params_rate(hw_params);
400 par->in_use |= 1 << substream->stream;
401 } else if (params_rate(hw_params) != par->rate) {
402 snd_pcm_lib_free_pages(substream);
403 par->in_use &= ~(1 << substream->stream);
406 spin_unlock(&par->lock);
411 static int s6000_pcm_hw_free(struct snd_pcm_substream *substream)
413 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
414 struct s6000_pcm_dma_params *par =
415 snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
417 spin_lock(&par->lock);
418 par->in_use &= ~(1 << substream->stream);
421 spin_unlock(&par->lock);
423 return snd_pcm_lib_free_pages(substream);
426 static struct snd_pcm_ops s6000_pcm_ops = {
427 .open = s6000_pcm_open,
428 .close = s6000_pcm_close,
429 .ioctl = snd_pcm_lib_ioctl,
430 .hw_params = s6000_pcm_hw_params,
431 .hw_free = s6000_pcm_hw_free,
432 .trigger = s6000_pcm_trigger,
433 .prepare = s6000_pcm_prepare,
434 .pointer = s6000_pcm_pointer,
437 static void s6000_pcm_free(struct snd_pcm *pcm)
439 struct snd_soc_pcm_runtime *runtime = pcm->private_data;
440 struct s6000_pcm_dma_params *params =
441 snd_soc_dai_get_dma_data(runtime->cpu_dai,
442 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream);
444 free_irq(params->irq, pcm);
445 snd_pcm_lib_preallocate_free_for_all(pcm);
448 static int s6000_pcm_new(struct snd_soc_pcm_runtime *runtime)
450 struct snd_card *card = runtime->card->snd_card;
451 struct snd_pcm *pcm = runtime->pcm;
452 struct s6000_pcm_dma_params *params;
455 params = snd_soc_dai_get_dma_data(runtime->cpu_dai,
456 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream);
458 res = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
462 if (params->dma_in) {
463 s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_in),
464 DMA_INDEX_CHNL(params->dma_in));
465 s6dmac_int_sources(DMA_MASK_DMAC(params->dma_in),
466 DMA_INDEX_CHNL(params->dma_in));
469 if (params->dma_out) {
470 s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_out),
471 DMA_INDEX_CHNL(params->dma_out));
472 s6dmac_int_sources(DMA_MASK_DMAC(params->dma_out),
473 DMA_INDEX_CHNL(params->dma_out));
476 res = request_irq(params->irq, s6000_pcm_irq, IRQF_SHARED,
479 printk(KERN_ERR "s6000-pcm couldn't get IRQ\n");
483 res = snd_pcm_lib_preallocate_pages_for_all(pcm,
486 S6_PCM_PREALLOCATE_SIZE,
487 S6_PCM_PREALLOCATE_MAX);
489 printk(KERN_WARNING "s6000-pcm: preallocation failed\n");
491 spin_lock_init(¶ms->lock);
497 static struct snd_soc_platform_driver s6000_soc_platform = {
498 .ops = &s6000_pcm_ops,
499 .pcm_new = s6000_pcm_new,
500 .pcm_free = s6000_pcm_free,
503 static int s6000_soc_platform_probe(struct platform_device *pdev)
505 return snd_soc_register_platform(&pdev->dev, &s6000_soc_platform);
508 static int s6000_soc_platform_remove(struct platform_device *pdev)
510 snd_soc_unregister_platform(&pdev->dev);
514 static struct platform_driver s6000_pcm_driver = {
516 .name = "s6000-pcm-audio",
517 .owner = THIS_MODULE,
520 .probe = s6000_soc_platform_probe,
521 .remove = s6000_soc_platform_remove,
524 module_platform_driver(s6000_pcm_driver);
526 MODULE_AUTHOR("Daniel Gloeckner");
527 MODULE_DESCRIPTION("Stretch s6000 family PCM DMA module");
528 MODULE_LICENSE("GPL");