416 lines
11 KiB
C
416 lines
11 KiB
C
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/*
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* ALSA PCM interface for the TI DAVINCI processor
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*
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* Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
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* Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.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 <linux/kernel.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/dma.h>
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#include <mach/edma.h>
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#include "davinci-pcm.h"
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static struct snd_pcm_hardware davinci_pcm_hardware = {
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.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE),
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.formats = (SNDRV_PCM_FMTBIT_S16_LE),
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.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
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SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
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SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
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SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
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SNDRV_PCM_RATE_KNOT),
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.rate_min = 8000,
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.rate_max = 96000,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = 128 * 1024,
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.period_bytes_min = 32,
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.period_bytes_max = 8 * 1024,
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.periods_min = 16,
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.periods_max = 255,
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.fifo_size = 0,
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};
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struct davinci_runtime_data {
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spinlock_t lock;
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int period; /* current DMA period */
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int master_lch; /* Master DMA channel */
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int slave_lch; /* linked parameter RAM reload slot */
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struct davinci_pcm_dma_params *params; /* DMA params */
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};
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static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
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{
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struct davinci_runtime_data *prtd = substream->runtime->private_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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int lch = prtd->slave_lch;
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unsigned int period_size;
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unsigned int dma_offset;
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dma_addr_t dma_pos;
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dma_addr_t src, dst;
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unsigned short src_bidx, dst_bidx;
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unsigned int data_type;
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unsigned short acnt;
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unsigned int count;
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period_size = snd_pcm_lib_period_bytes(substream);
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dma_offset = prtd->period * period_size;
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dma_pos = runtime->dma_addr + dma_offset;
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pr_debug("davinci_pcm: audio_set_dma_params_play channel = %d "
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"dma_ptr = %x period_size=%x\n", lch, dma_pos, period_size);
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data_type = prtd->params->data_type;
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count = period_size / data_type;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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src = dma_pos;
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dst = prtd->params->dma_addr;
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src_bidx = data_type;
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dst_bidx = 0;
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} else {
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src = prtd->params->dma_addr;
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dst = dma_pos;
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src_bidx = 0;
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dst_bidx = data_type;
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}
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acnt = prtd->params->acnt;
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edma_set_src(lch, src, INCR, W8BIT);
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edma_set_dest(lch, dst, INCR, W8BIT);
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edma_set_src_index(lch, src_bidx, 0);
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edma_set_dest_index(lch, dst_bidx, 0);
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edma_set_transfer_params(lch, acnt, count, 1, 0, ASYNC);
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prtd->period++;
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if (unlikely(prtd->period >= runtime->periods))
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prtd->period = 0;
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}
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static void davinci_pcm_dma_irq(unsigned lch, u16 ch_status, void *data)
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{
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struct snd_pcm_substream *substream = data;
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struct davinci_runtime_data *prtd = substream->runtime->private_data;
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pr_debug("davinci_pcm: lch=%d, status=0x%x\n", lch, ch_status);
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if (unlikely(ch_status != DMA_COMPLETE))
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return;
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if (snd_pcm_running(substream)) {
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snd_pcm_period_elapsed(substream);
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spin_lock(&prtd->lock);
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davinci_pcm_enqueue_dma(substream);
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spin_unlock(&prtd->lock);
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}
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}
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static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
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{
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struct davinci_runtime_data *prtd = substream->runtime->private_data;
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struct edmacc_param p_ram;
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int ret;
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/* Request master DMA channel */
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ret = edma_alloc_channel(prtd->params->channel,
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davinci_pcm_dma_irq, substream,
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EVENTQ_0);
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if (ret < 0)
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return ret;
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prtd->master_lch = ret;
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/* Request parameter RAM reload slot */
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ret = edma_alloc_slot(EDMA_CTLR(prtd->master_lch), EDMA_SLOT_ANY);
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if (ret < 0) {
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edma_free_channel(prtd->master_lch);
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return ret;
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}
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prtd->slave_lch = ret;
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/* Issue transfer completion IRQ when the channel completes a
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* transfer, then always reload from the same slot (by a kind
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* of loopback link). The completion IRQ handler will update
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* the reload slot with a new buffer.
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*
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* REVISIT save p_ram here after setting up everything except
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* the buffer and its length (ccnt) ... use it as a template
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* so davinci_pcm_enqueue_dma() takes less time in IRQ.
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*/
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edma_read_slot(prtd->slave_lch, &p_ram);
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p_ram.opt |= TCINTEN | EDMA_TCC(EDMA_CHAN_SLOT(prtd->master_lch));
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p_ram.link_bcntrld = EDMA_CHAN_SLOT(prtd->slave_lch) << 5;
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edma_write_slot(prtd->slave_lch, &p_ram);
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return 0;
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}
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static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct davinci_runtime_data *prtd = substream->runtime->private_data;
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int ret = 0;
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spin_lock(&prtd->lock);
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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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edma_start(prtd->master_lch);
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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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edma_stop(prtd->master_lch);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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spin_unlock(&prtd->lock);
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return ret;
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}
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static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct davinci_runtime_data *prtd = substream->runtime->private_data;
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struct edmacc_param temp;
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prtd->period = 0;
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davinci_pcm_enqueue_dma(substream);
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/* Copy self-linked parameter RAM entry into master channel */
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edma_read_slot(prtd->slave_lch, &temp);
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edma_write_slot(prtd->master_lch, &temp);
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davinci_pcm_enqueue_dma(substream);
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return 0;
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}
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static snd_pcm_uframes_t
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davinci_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 davinci_runtime_data *prtd = runtime->private_data;
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unsigned int offset;
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dma_addr_t count;
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dma_addr_t src, dst;
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spin_lock(&prtd->lock);
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edma_get_position(prtd->master_lch, &src, &dst);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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count = src - runtime->dma_addr;
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else
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count = dst - runtime->dma_addr;
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spin_unlock(&prtd->lock);
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offset = bytes_to_frames(runtime, count);
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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 davinci_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 davinci_runtime_data *prtd;
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int ret = 0;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct davinci_pcm_dma_params *pa = rtd->dai->cpu_dai->private_data;
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struct davinci_pcm_dma_params *params = &pa[substream->stream];
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if (!params)
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return -ENODEV;
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snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
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/* ensure that buffer size is a multiple of period size */
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ret = snd_pcm_hw_constraint_integer(runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (ret < 0)
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return ret;
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prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
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if (prtd == NULL)
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return -ENOMEM;
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spin_lock_init(&prtd->lock);
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prtd->params = params;
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runtime->private_data = prtd;
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ret = davinci_pcm_dma_request(substream);
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if (ret) {
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printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
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kfree(prtd);
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}
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return ret;
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}
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static int davinci_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 davinci_runtime_data *prtd = runtime->private_data;
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edma_unlink(prtd->slave_lch);
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edma_free_slot(prtd->slave_lch);
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edma_free_channel(prtd->master_lch);
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kfree(prtd);
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return 0;
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}
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static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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{
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return snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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}
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static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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return snd_pcm_lib_free_pages(substream);
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}
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static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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return dma_mmap_writecombine(substream->pcm->card->dev, vma,
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runtime->dma_area,
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runtime->dma_addr,
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runtime->dma_bytes);
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}
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static struct snd_pcm_ops davinci_pcm_ops = {
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.open = davinci_pcm_open,
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.close = davinci_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = davinci_pcm_hw_params,
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.hw_free = davinci_pcm_hw_free,
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.prepare = davinci_pcm_prepare,
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.trigger = davinci_pcm_trigger,
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.pointer = davinci_pcm_pointer,
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.mmap = davinci_pcm_mmap,
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};
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static int davinci_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 = davinci_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_writecombine(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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pr_debug("davinci_pcm: preallocate_dma_buffer: area=%p, addr=%p, "
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"size=%d\n", (void *) buf->area, (void *) buf->addr, size);
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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 davinci_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 < 2; 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_writecombine(pcm->card->dev, buf->bytes,
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buf->area, buf->addr);
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buf->area = NULL;
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}
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}
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|
|
|
||
|
|
static u64 davinci_pcm_dmamask = 0xffffffff;
|
||
|
|
|
||
|
|
static int davinci_pcm_new(struct snd_card *card,
|
||
|
|
struct snd_soc_dai *dai, struct snd_pcm *pcm)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (!card->dev->dma_mask)
|
||
|
|
card->dev->dma_mask = &davinci_pcm_dmamask;
|
||
|
|
if (!card->dev->coherent_dma_mask)
|
||
|
|
card->dev->coherent_dma_mask = 0xffffffff;
|
||
|
|
|
||
|
|
if (dai->playback.channels_min) {
|
||
|
|
ret = davinci_pcm_preallocate_dma_buffer(pcm,
|
||
|
|
SNDRV_PCM_STREAM_PLAYBACK);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (dai->capture.channels_min) {
|
||
|
|
ret = davinci_pcm_preallocate_dma_buffer(pcm,
|
||
|
|
SNDRV_PCM_STREAM_CAPTURE);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct snd_soc_platform davinci_soc_platform = {
|
||
|
|
.name = "davinci-audio",
|
||
|
|
.pcm_ops = &davinci_pcm_ops,
|
||
|
|
.pcm_new = davinci_pcm_new,
|
||
|
|
.pcm_free = davinci_pcm_free,
|
||
|
|
};
|
||
|
|
EXPORT_SYMBOL_GPL(davinci_soc_platform);
|
||
|
|
|
||
|
|
static int __init davinci_soc_platform_init(void)
|
||
|
|
{
|
||
|
|
return snd_soc_register_platform(&davinci_soc_platform);
|
||
|
|
}
|
||
|
|
module_init(davinci_soc_platform_init);
|
||
|
|
|
||
|
|
static void __exit davinci_soc_platform_exit(void)
|
||
|
|
{
|
||
|
|
snd_soc_unregister_platform(&davinci_soc_platform);
|
||
|
|
}
|
||
|
|
module_exit(davinci_soc_platform_exit);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Vladimir Barinov");
|
||
|
|
MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
|
||
|
|
MODULE_LICENSE("GPL");
|