2 * ALSA PCM interface for the TI DAVINCI processor
4 * Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
5 * Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.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/kernel.h>
19 #include <sound/core.h>
20 #include <sound/pcm.h>
21 #include <sound/pcm_params.h>
22 #include <sound/soc.h>
25 #include <mach/edma.h>
27 #include "davinci-pcm.h"
29 static struct snd_pcm_hardware davinci_pcm_hardware = {
30 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
31 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
32 SNDRV_PCM_INFO_PAUSE),
33 .formats = (SNDRV_PCM_FMTBIT_S16_LE),
34 .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
35 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
36 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
37 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
43 .buffer_bytes_max = 128 * 1024,
44 .period_bytes_min = 32,
45 .period_bytes_max = 8 * 1024,
51 struct davinci_runtime_data {
53 int period; /* current DMA period */
54 int master_lch; /* Master DMA channel */
55 int slave_lch; /* linked parameter RAM reload slot */
56 struct davinci_pcm_dma_params *params; /* DMA params */
59 static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
61 struct davinci_runtime_data *prtd = substream->runtime->private_data;
62 struct snd_pcm_runtime *runtime = substream->runtime;
63 int lch = prtd->slave_lch;
64 unsigned int period_size;
65 unsigned int dma_offset;
68 unsigned short src_bidx, dst_bidx;
69 unsigned short src_cidx, dst_cidx;
70 unsigned int data_type;
73 unsigned int fifo_level;
75 period_size = snd_pcm_lib_period_bytes(substream);
76 dma_offset = prtd->period * period_size;
77 dma_pos = runtime->dma_addr + dma_offset;
78 fifo_level = prtd->params->fifo_level;
80 pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
81 "dma_ptr = %x period_size=%x\n", lch, dma_pos, period_size);
83 data_type = prtd->params->data_type;
84 count = period_size / data_type;
88 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
90 dst = prtd->params->dma_addr;
93 src_cidx = data_type * fifo_level;
96 src = prtd->params->dma_addr;
101 dst_cidx = data_type * fifo_level;
104 acnt = prtd->params->acnt;
105 edma_set_src(lch, src, INCR, W8BIT);
106 edma_set_dest(lch, dst, INCR, W8BIT);
108 edma_set_src_index(lch, src_bidx, src_cidx);
109 edma_set_dest_index(lch, dst_bidx, dst_cidx);
112 edma_set_transfer_params(lch, acnt, count, 1, 0, ASYNC);
114 edma_set_transfer_params(lch, acnt, fifo_level, count,
118 if (unlikely(prtd->period >= runtime->periods))
122 static void davinci_pcm_dma_irq(unsigned lch, u16 ch_status, void *data)
124 struct snd_pcm_substream *substream = data;
125 struct davinci_runtime_data *prtd = substream->runtime->private_data;
127 pr_debug("davinci_pcm: lch=%d, status=0x%x\n", lch, ch_status);
129 if (unlikely(ch_status != DMA_COMPLETE))
132 if (snd_pcm_running(substream)) {
133 snd_pcm_period_elapsed(substream);
135 spin_lock(&prtd->lock);
136 davinci_pcm_enqueue_dma(substream);
137 spin_unlock(&prtd->lock);
141 static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
143 struct davinci_runtime_data *prtd = substream->runtime->private_data;
144 struct edmacc_param p_ram;
147 /* Request master DMA channel */
148 ret = edma_alloc_channel(prtd->params->channel,
149 davinci_pcm_dma_irq, substream,
153 prtd->master_lch = ret;
155 /* Request parameter RAM reload slot */
156 ret = edma_alloc_slot(EDMA_CTLR(prtd->master_lch), EDMA_SLOT_ANY);
158 edma_free_channel(prtd->master_lch);
161 prtd->slave_lch = ret;
163 /* Issue transfer completion IRQ when the channel completes a
164 * transfer, then always reload from the same slot (by a kind
165 * of loopback link). The completion IRQ handler will update
166 * the reload slot with a new buffer.
168 * REVISIT save p_ram here after setting up everything except
169 * the buffer and its length (ccnt) ... use it as a template
170 * so davinci_pcm_enqueue_dma() takes less time in IRQ.
172 edma_read_slot(prtd->slave_lch, &p_ram);
173 p_ram.opt |= TCINTEN | EDMA_TCC(EDMA_CHAN_SLOT(prtd->master_lch));
174 p_ram.link_bcntrld = EDMA_CHAN_SLOT(prtd->slave_lch) << 5;
175 edma_write_slot(prtd->slave_lch, &p_ram);
180 static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
182 struct davinci_runtime_data *prtd = substream->runtime->private_data;
185 spin_lock(&prtd->lock);
188 case SNDRV_PCM_TRIGGER_START:
189 case SNDRV_PCM_TRIGGER_RESUME:
190 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
191 edma_start(prtd->master_lch);
193 case SNDRV_PCM_TRIGGER_STOP:
194 case SNDRV_PCM_TRIGGER_SUSPEND:
195 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
196 edma_stop(prtd->master_lch);
203 spin_unlock(&prtd->lock);
208 static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
210 struct davinci_runtime_data *prtd = substream->runtime->private_data;
211 struct edmacc_param temp;
214 davinci_pcm_enqueue_dma(substream);
216 /* Copy self-linked parameter RAM entry into master channel */
217 edma_read_slot(prtd->slave_lch, &temp);
218 edma_write_slot(prtd->master_lch, &temp);
219 davinci_pcm_enqueue_dma(substream);
224 static snd_pcm_uframes_t
225 davinci_pcm_pointer(struct snd_pcm_substream *substream)
227 struct snd_pcm_runtime *runtime = substream->runtime;
228 struct davinci_runtime_data *prtd = runtime->private_data;
233 spin_lock(&prtd->lock);
235 edma_get_position(prtd->master_lch, &src, &dst);
236 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
237 count = src - runtime->dma_addr;
239 count = dst - runtime->dma_addr;
241 spin_unlock(&prtd->lock);
243 offset = bytes_to_frames(runtime, count);
244 if (offset >= runtime->buffer_size)
250 static int davinci_pcm_open(struct snd_pcm_substream *substream)
252 struct snd_pcm_runtime *runtime = substream->runtime;
253 struct davinci_runtime_data *prtd;
255 struct snd_soc_pcm_runtime *rtd = substream->private_data;
256 struct davinci_pcm_dma_params *pa = rtd->dai->cpu_dai->private_data;
257 struct davinci_pcm_dma_params *params = &pa[substream->stream];
261 snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
262 /* ensure that buffer size is a multiple of period size */
263 ret = snd_pcm_hw_constraint_integer(runtime,
264 SNDRV_PCM_HW_PARAM_PERIODS);
268 prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
272 spin_lock_init(&prtd->lock);
273 prtd->params = params;
275 runtime->private_data = prtd;
277 ret = davinci_pcm_dma_request(substream);
279 printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
286 static int davinci_pcm_close(struct snd_pcm_substream *substream)
288 struct snd_pcm_runtime *runtime = substream->runtime;
289 struct davinci_runtime_data *prtd = runtime->private_data;
291 edma_unlink(prtd->slave_lch);
293 edma_free_slot(prtd->slave_lch);
294 edma_free_channel(prtd->master_lch);
301 static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
302 struct snd_pcm_hw_params *hw_params)
304 return snd_pcm_lib_malloc_pages(substream,
305 params_buffer_bytes(hw_params));
308 static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
310 return snd_pcm_lib_free_pages(substream);
313 static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
314 struct vm_area_struct *vma)
316 struct snd_pcm_runtime *runtime = substream->runtime;
318 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
324 static struct snd_pcm_ops davinci_pcm_ops = {
325 .open = davinci_pcm_open,
326 .close = davinci_pcm_close,
327 .ioctl = snd_pcm_lib_ioctl,
328 .hw_params = davinci_pcm_hw_params,
329 .hw_free = davinci_pcm_hw_free,
330 .prepare = davinci_pcm_prepare,
331 .trigger = davinci_pcm_trigger,
332 .pointer = davinci_pcm_pointer,
333 .mmap = davinci_pcm_mmap,
336 static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
338 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
339 struct snd_dma_buffer *buf = &substream->dma_buffer;
340 size_t size = davinci_pcm_hardware.buffer_bytes_max;
342 buf->dev.type = SNDRV_DMA_TYPE_DEV;
343 buf->dev.dev = pcm->card->dev;
344 buf->private_data = NULL;
345 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
346 &buf->addr, GFP_KERNEL);
348 pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
349 "size=%d\n", (void *) buf->area, (void *) buf->addr, size);
358 static void davinci_pcm_free(struct snd_pcm *pcm)
360 struct snd_pcm_substream *substream;
361 struct snd_dma_buffer *buf;
364 for (stream = 0; stream < 2; stream++) {
365 substream = pcm->streams[stream].substream;
369 buf = &substream->dma_buffer;
373 dma_free_writecombine(pcm->card->dev, buf->bytes,
374 buf->area, buf->addr);
379 static u64 davinci_pcm_dmamask = 0xffffffff;
381 static int davinci_pcm_new(struct snd_card *card,
382 struct snd_soc_dai *dai, struct snd_pcm *pcm)
386 if (!card->dev->dma_mask)
387 card->dev->dma_mask = &davinci_pcm_dmamask;
388 if (!card->dev->coherent_dma_mask)
389 card->dev->coherent_dma_mask = 0xffffffff;
391 if (dai->playback.channels_min) {
392 ret = davinci_pcm_preallocate_dma_buffer(pcm,
393 SNDRV_PCM_STREAM_PLAYBACK);
398 if (dai->capture.channels_min) {
399 ret = davinci_pcm_preallocate_dma_buffer(pcm,
400 SNDRV_PCM_STREAM_CAPTURE);
408 struct snd_soc_platform davinci_soc_platform = {
409 .name = "davinci-audio",
410 .pcm_ops = &davinci_pcm_ops,
411 .pcm_new = davinci_pcm_new,
412 .pcm_free = davinci_pcm_free,
414 EXPORT_SYMBOL_GPL(davinci_soc_platform);
416 static int __init davinci_soc_platform_init(void)
418 return snd_soc_register_platform(&davinci_soc_platform);
420 module_init(davinci_soc_platform_init);
422 static void __exit davinci_soc_platform_exit(void)
424 snd_soc_unregister_platform(&davinci_soc_platform);
426 module_exit(davinci_soc_platform_exit);
428 MODULE_AUTHOR("Vladimir Barinov");
429 MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
430 MODULE_LICENSE("GPL");