359 строки
8.9 KiB
C
359 строки
8.9 KiB
C
/*
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <asm/mach-jz4740/dma.h>
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#include "jz4740-pcm.h"
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struct jz4740_runtime_data {
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unsigned long dma_period;
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dma_addr_t dma_start;
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dma_addr_t dma_pos;
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dma_addr_t dma_end;
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struct jz4740_dma_chan *dma;
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dma_addr_t fifo_addr;
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};
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/* identify hardware playback capabilities */
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static const struct snd_pcm_hardware jz4740_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER,
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.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S8,
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.rates = SNDRV_PCM_RATE_8000_48000,
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.channels_min = 1,
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.channels_max = 2,
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.period_bytes_min = 16,
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.period_bytes_max = 2 * PAGE_SIZE,
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.periods_min = 2,
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.periods_max = 128,
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.buffer_bytes_max = 128 * 2 * PAGE_SIZE,
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.fifo_size = 32,
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};
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static void jz4740_pcm_start_transfer(struct jz4740_runtime_data *prtd,
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struct snd_pcm_substream *substream)
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{
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unsigned long count;
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if (prtd->dma_pos == prtd->dma_end)
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prtd->dma_pos = prtd->dma_start;
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if (prtd->dma_pos + prtd->dma_period > prtd->dma_end)
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count = prtd->dma_end - prtd->dma_pos;
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else
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count = prtd->dma_period;
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jz4740_dma_disable(prtd->dma);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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jz4740_dma_set_src_addr(prtd->dma, prtd->dma_pos);
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jz4740_dma_set_dst_addr(prtd->dma, prtd->fifo_addr);
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} else {
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jz4740_dma_set_src_addr(prtd->dma, prtd->fifo_addr);
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jz4740_dma_set_dst_addr(prtd->dma, prtd->dma_pos);
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}
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jz4740_dma_set_transfer_count(prtd->dma, count);
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prtd->dma_pos += count;
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jz4740_dma_enable(prtd->dma);
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}
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static void jz4740_pcm_dma_transfer_done(struct jz4740_dma_chan *dma, int err,
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void *dev_id)
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{
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struct snd_pcm_substream *substream = dev_id;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct jz4740_runtime_data *prtd = runtime->private_data;
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snd_pcm_period_elapsed(substream);
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jz4740_pcm_start_transfer(prtd, substream);
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}
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static int jz4740_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct jz4740_runtime_data *prtd = runtime->private_data;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct jz4740_pcm_config *config;
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config = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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if (!config)
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return 0;
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if (!prtd->dma) {
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
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prtd->dma = jz4740_dma_request(substream, "PCM Capture");
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else
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prtd->dma = jz4740_dma_request(substream, "PCM Playback");
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}
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if (!prtd->dma)
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return -EBUSY;
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jz4740_dma_configure(prtd->dma, &config->dma_config);
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prtd->fifo_addr = config->fifo_addr;
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jz4740_dma_set_complete_cb(prtd->dma, jz4740_pcm_dma_transfer_done);
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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runtime->dma_bytes = params_buffer_bytes(params);
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prtd->dma_period = params_period_bytes(params);
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prtd->dma_start = runtime->dma_addr;
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prtd->dma_pos = prtd->dma_start;
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prtd->dma_end = prtd->dma_start + runtime->dma_bytes;
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return 0;
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}
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static int jz4740_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct jz4740_runtime_data *prtd = substream->runtime->private_data;
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snd_pcm_set_runtime_buffer(substream, NULL);
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if (prtd->dma) {
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jz4740_dma_free(prtd->dma);
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prtd->dma = NULL;
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}
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return 0;
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}
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static int jz4740_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct jz4740_runtime_data *prtd = substream->runtime->private_data;
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if (!prtd->dma)
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return -EBUSY;
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prtd->dma_pos = prtd->dma_start;
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return 0;
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}
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static int jz4740_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct jz4740_runtime_data *prtd = runtime->private_data;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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jz4740_pcm_start_transfer(prtd, substream);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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jz4740_dma_disable(prtd->dma);
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break;
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default:
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break;
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}
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return 0;
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}
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static snd_pcm_uframes_t jz4740_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct jz4740_runtime_data *prtd = runtime->private_data;
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unsigned long byte_offset;
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snd_pcm_uframes_t offset;
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struct jz4740_dma_chan *dma = prtd->dma;
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/* prtd->dma_pos points to the end of the current transfer. So by
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* subtracting prdt->dma_start we get the offset to the end of the
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* current period in bytes. By subtracting the residue of the transfer
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* we get the current offset in bytes. */
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byte_offset = prtd->dma_pos - prtd->dma_start;
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byte_offset -= jz4740_dma_get_residue(dma);
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offset = bytes_to_frames(runtime, byte_offset);
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if (offset >= runtime->buffer_size)
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offset = 0;
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return offset;
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}
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static int jz4740_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct jz4740_runtime_data *prtd;
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prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
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if (prtd == NULL)
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return -ENOMEM;
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snd_soc_set_runtime_hwparams(substream, &jz4740_pcm_hardware);
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runtime->private_data = prtd;
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return 0;
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}
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static int jz4740_pcm_close(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct jz4740_runtime_data *prtd = runtime->private_data;
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kfree(prtd);
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return 0;
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}
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static int jz4740_pcm_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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return remap_pfn_range(vma, vma->vm_start,
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substream->dma_buffer.addr >> PAGE_SHIFT,
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vma->vm_end - vma->vm_start, vma->vm_page_prot);
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}
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static struct snd_pcm_ops jz4740_pcm_ops = {
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.open = jz4740_pcm_open,
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.close = jz4740_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = jz4740_pcm_hw_params,
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.hw_free = jz4740_pcm_hw_free,
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.prepare = jz4740_pcm_prepare,
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.trigger = jz4740_pcm_trigger,
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.pointer = jz4740_pcm_pointer,
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.mmap = jz4740_pcm_mmap,
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};
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static int jz4740_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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{
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = jz4740_pcm_hardware.buffer_bytes_max;
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buf->dev.type = SNDRV_DMA_TYPE_DEV;
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buf->dev.dev = pcm->card->dev;
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buf->private_data = NULL;
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buf->area = dma_alloc_noncoherent(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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if (!buf->area)
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return -ENOMEM;
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buf->bytes = size;
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return 0;
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}
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static void jz4740_pcm_free(struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *substream;
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struct snd_dma_buffer *buf;
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int stream;
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for (stream = 0; stream < SNDRV_PCM_STREAM_LAST; ++stream) {
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substream = pcm->streams[stream].substream;
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if (!substream)
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continue;
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buf = &substream->dma_buffer;
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if (!buf->area)
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continue;
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dma_free_noncoherent(pcm->card->dev, buf->bytes, buf->area,
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buf->addr);
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buf->area = NULL;
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}
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}
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static int jz4740_pcm_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_card *card = rtd->card->snd_card;
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struct snd_pcm *pcm = rtd->pcm;
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int ret;
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ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
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if (ret)
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return ret;
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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
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ret = jz4740_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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goto err;
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}
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if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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ret = jz4740_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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goto err;
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}
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err:
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return ret;
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}
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static struct snd_soc_platform_driver jz4740_soc_platform = {
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.ops = &jz4740_pcm_ops,
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.pcm_new = jz4740_pcm_new,
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.pcm_free = jz4740_pcm_free,
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};
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static int jz4740_pcm_probe(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev, &jz4740_soc_platform);
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}
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static int jz4740_pcm_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_platform(&pdev->dev);
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return 0;
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}
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static struct platform_driver jz4740_pcm_driver = {
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.probe = jz4740_pcm_probe,
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.remove = jz4740_pcm_remove,
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.driver = {
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.name = "jz4740-pcm-audio",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(jz4740_pcm_driver);
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("Ingenic SoC JZ4740 PCM driver");
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MODULE_LICENSE("GPL");
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