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![Daniel Glöckner](/assets/img/avatar_default.png)
This patch adds a driver for the I2S interface found on Stretch s6000 family processors. Signed-off-by: Daniel Glöckner <dg@emlix.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
497 lines
13 KiB
C
497 lines
13 KiB
C
/*
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* ALSA PCM interface for the Stetch s6000 family
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*
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* Author: Daniel Gloeckner, <dg@emlix.com>
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* Copyright: (C) 2009 emlix GmbH <info@emlix.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/interrupt.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 <variant/dmac.h>
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#include "s6000-pcm.h"
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#define S6_PCM_PREALLOCATE_SIZE (96 * 1024)
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#define S6_PCM_PREALLOCATE_MAX (2048 * 1024)
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static struct snd_pcm_hardware s6000_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 | SNDRV_PCM_INFO_JOINT_DUPLEX),
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.formats = (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE),
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.rates = (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
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SNDRV_PCM_RATE_8000_192000),
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.rate_min = 0,
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.rate_max = 1562500,
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.channels_min = 2,
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.channels_max = 8,
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.buffer_bytes_max = 0x7ffffff0,
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.period_bytes_min = 16,
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.period_bytes_max = 0xfffff0,
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.periods_min = 2,
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.periods_max = 1024, /* no limit */
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.fifo_size = 0,
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};
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struct s6000_runtime_data {
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spinlock_t lock;
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int period; /* current DMA period */
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};
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static void s6000_pcm_enqueue_dma(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 s6000_runtime_data *prtd = runtime->private_data;
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struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
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struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
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int channel;
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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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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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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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src = dma_pos;
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dst = par->sif_out;
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channel = par->dma_out;
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} else {
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src = par->sif_in;
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dst = dma_pos;
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channel = par->dma_in;
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}
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if (!s6dmac_channel_enabled(DMA_MASK_DMAC(channel),
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DMA_INDEX_CHNL(channel)))
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return;
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if (s6dmac_fifo_full(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel))) {
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printk(KERN_ERR "s6000-pcm: fifo full\n");
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return;
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}
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BUG_ON(period_size & 15);
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s6dmac_put_fifo(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel),
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src, dst, period_size);
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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 irqreturn_t s6000_pcm_irq(int irq, void *data)
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{
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struct snd_pcm *pcm = data;
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struct snd_soc_pcm_runtime *runtime = pcm->private_data;
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struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
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struct s6000_runtime_data *prtd;
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unsigned int has_xrun;
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int i, ret = IRQ_NONE;
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u32 channel[2] = {
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[SNDRV_PCM_STREAM_PLAYBACK] = params->dma_out,
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[SNDRV_PCM_STREAM_CAPTURE] = params->dma_in
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};
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has_xrun = params->check_xrun(runtime->dai->cpu_dai);
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for (i = 0; i < ARRAY_SIZE(channel); ++i) {
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struct snd_pcm_substream *substream = pcm->streams[i].substream;
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unsigned int pending;
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if (!channel[i])
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continue;
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if (unlikely(has_xrun & (1 << i)) &&
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substream->runtime &&
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snd_pcm_running(substream)) {
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dev_dbg(pcm->dev, "xrun\n");
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snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
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ret = IRQ_HANDLED;
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}
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pending = s6dmac_int_sources(DMA_MASK_DMAC(channel[i]),
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DMA_INDEX_CHNL(channel[i]));
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if (pending & 1) {
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ret = IRQ_HANDLED;
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if (likely(substream->runtime &&
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snd_pcm_running(substream))) {
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snd_pcm_period_elapsed(substream);
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dev_dbg(pcm->dev, "period elapsed %x %x\n",
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s6dmac_cur_src(DMA_MASK_DMAC(channel[i]),
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DMA_INDEX_CHNL(channel[i])),
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s6dmac_cur_dst(DMA_MASK_DMAC(channel[i]),
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DMA_INDEX_CHNL(channel[i])));
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prtd = substream->runtime->private_data;
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spin_lock(&prtd->lock);
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s6000_pcm_enqueue_dma(substream);
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spin_unlock(&prtd->lock);
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}
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}
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if (unlikely(pending & ~7)) {
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if (pending & (1 << 3))
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printk(KERN_WARNING
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"s6000-pcm: DMA %x Underflow\n",
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channel[i]);
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if (pending & (1 << 4))
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printk(KERN_WARNING
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"s6000-pcm: DMA %x Overflow\n",
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channel[i]);
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if (pending & 0x1e0)
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printk(KERN_WARNING
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"s6000-pcm: DMA %x Master Error "
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"(mask %x)\n",
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channel[i], pending >> 5);
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}
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}
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return ret;
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}
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static int s6000_pcm_start(struct snd_pcm_substream *substream)
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{
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struct s6000_runtime_data *prtd = substream->runtime->private_data;
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struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
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struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
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unsigned long flags;
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int srcinc;
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u32 dma;
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spin_lock_irqsave(&prtd->lock, flags);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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srcinc = 1;
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dma = par->dma_out;
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} else {
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srcinc = 0;
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dma = par->dma_in;
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}
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s6dmac_enable_chan(DMA_MASK_DMAC(dma), DMA_INDEX_CHNL(dma),
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1 /* priority 1 (0 is max) */,
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0 /* peripheral requests w/o xfer length mode */,
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srcinc /* source address increment */,
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srcinc^1 /* destination address increment */,
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0 /* chunksize 0 (skip impossible on this dma) */,
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0 /* source skip after chunk (impossible) */,
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0 /* destination skip after chunk (impossible) */,
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4 /* 16 byte burst size */,
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-1 /* don't conserve bandwidth */,
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0 /* low watermark irq descriptor theshold */,
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0 /* disable hardware timestamps */,
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1 /* enable channel */);
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s6000_pcm_enqueue_dma(substream);
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s6000_pcm_enqueue_dma(substream);
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spin_unlock_irqrestore(&prtd->lock, flags);
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return 0;
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}
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static int s6000_pcm_stop(struct snd_pcm_substream *substream)
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{
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struct s6000_runtime_data *prtd = substream->runtime->private_data;
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struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
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struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
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unsigned long flags;
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u32 channel;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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channel = par->dma_out;
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else
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channel = par->dma_in;
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s6dmac_set_terminal_count(DMA_MASK_DMAC(channel),
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DMA_INDEX_CHNL(channel), 0);
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spin_lock_irqsave(&prtd->lock, flags);
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s6dmac_disable_chan(DMA_MASK_DMAC(channel), DMA_INDEX_CHNL(channel));
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spin_unlock_irqrestore(&prtd->lock, flags);
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return 0;
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}
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static int s6000_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
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struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
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int ret;
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ret = par->trigger(substream, cmd, 0);
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if (ret < 0)
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return ret;
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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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ret = s6000_pcm_start(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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ret = s6000_pcm_stop(substream);
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break;
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default:
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ret = -EINVAL;
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}
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if (ret < 0)
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return ret;
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return par->trigger(substream, cmd, 1);
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}
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static int s6000_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct s6000_runtime_data *prtd = substream->runtime->private_data;
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prtd->period = 0;
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return 0;
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}
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static snd_pcm_uframes_t s6000_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
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struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct s6000_runtime_data *prtd = runtime->private_data;
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unsigned long flags;
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unsigned int offset;
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dma_addr_t count;
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spin_lock_irqsave(&prtd->lock, flags);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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count = s6dmac_cur_src(DMA_MASK_DMAC(par->dma_out),
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DMA_INDEX_CHNL(par->dma_out));
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else
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count = s6dmac_cur_dst(DMA_MASK_DMAC(par->dma_in),
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DMA_INDEX_CHNL(par->dma_in));
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count -= runtime->dma_addr;
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spin_unlock_irqrestore(&prtd->lock, flags);
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offset = bytes_to_frames(runtime, count);
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if (unlikely(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 s6000_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
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struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct s6000_runtime_data *prtd;
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int ret;
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snd_soc_set_runtime_hwparams(substream, &s6000_pcm_hardware);
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ret = snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 16);
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if (ret < 0)
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return ret;
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ret = snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 16);
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if (ret < 0)
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return ret;
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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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if (par->same_rate) {
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int rate;
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spin_lock(&par->lock); /* needed? */
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rate = par->rate;
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spin_unlock(&par->lock);
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if (rate != -1) {
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ret = snd_pcm_hw_constraint_minmax(runtime,
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SNDRV_PCM_HW_PARAM_RATE,
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rate, rate);
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if (ret < 0)
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return ret;
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}
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}
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prtd = kzalloc(sizeof(struct s6000_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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runtime->private_data = prtd;
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return 0;
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}
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static int s6000_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 s6000_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 s6000_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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struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
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struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
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int ret;
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ret = snd_pcm_lib_malloc_pages(substream,
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params_buffer_bytes(hw_params));
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if (ret < 0) {
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printk(KERN_WARNING "s6000-pcm: allocation of memory failed\n");
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return ret;
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}
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if (par->same_rate) {
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spin_lock(&par->lock);
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if (par->rate == -1 ||
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!(par->in_use & ~(1 << substream->stream))) {
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par->rate = params_rate(hw_params);
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par->in_use |= 1 << substream->stream;
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} else if (params_rate(hw_params) != par->rate) {
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snd_pcm_lib_free_pages(substream);
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par->in_use &= ~(1 << substream->stream);
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ret = -EBUSY;
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}
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spin_unlock(&par->lock);
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}
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return ret;
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}
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static int s6000_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
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struct s6000_pcm_dma_params *par = soc_runtime->dai->cpu_dai->dma_data;
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spin_lock(&par->lock);
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par->in_use &= ~(1 << substream->stream);
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if (!par->in_use)
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par->rate = -1;
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spin_unlock(&par->lock);
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return snd_pcm_lib_free_pages(substream);
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}
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static struct snd_pcm_ops s6000_pcm_ops = {
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.open = s6000_pcm_open,
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.close = s6000_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = s6000_pcm_hw_params,
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.hw_free = s6000_pcm_hw_free,
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.trigger = s6000_pcm_trigger,
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.prepare = s6000_pcm_prepare,
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.pointer = s6000_pcm_pointer,
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};
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static void s6000_pcm_free(struct snd_pcm *pcm)
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{
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struct snd_soc_pcm_runtime *runtime = pcm->private_data;
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struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
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free_irq(params->irq, pcm);
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snd_pcm_lib_preallocate_free_for_all(pcm);
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}
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static u64 s6000_pcm_dmamask = DMA_32BIT_MASK;
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static int s6000_pcm_new(struct snd_card *card,
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struct snd_soc_dai *dai, struct snd_pcm *pcm)
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{
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struct snd_soc_pcm_runtime *runtime = pcm->private_data;
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struct s6000_pcm_dma_params *params = runtime->dai->cpu_dai->dma_data;
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int res;
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &s6000_pcm_dmamask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = DMA_32BIT_MASK;
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if (params->dma_in) {
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s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_in),
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DMA_INDEX_CHNL(params->dma_in));
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s6dmac_int_sources(DMA_MASK_DMAC(params->dma_in),
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DMA_INDEX_CHNL(params->dma_in));
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}
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if (params->dma_out) {
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s6dmac_disable_chan(DMA_MASK_DMAC(params->dma_out),
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DMA_INDEX_CHNL(params->dma_out));
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s6dmac_int_sources(DMA_MASK_DMAC(params->dma_out),
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DMA_INDEX_CHNL(params->dma_out));
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}
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res = request_irq(params->irq, s6000_pcm_irq, IRQF_SHARED,
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s6000_soc_platform.name, pcm);
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if (res) {
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printk(KERN_ERR "s6000-pcm couldn't get IRQ\n");
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return res;
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}
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res = snd_pcm_lib_preallocate_pages_for_all(pcm,
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SNDRV_DMA_TYPE_DEV,
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card->dev,
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S6_PCM_PREALLOCATE_SIZE,
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S6_PCM_PREALLOCATE_MAX);
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if (res)
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printk(KERN_WARNING "s6000-pcm: preallocation failed\n");
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spin_lock_init(¶ms->lock);
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params->in_use = 0;
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params->rate = -1;
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return 0;
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}
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struct snd_soc_platform s6000_soc_platform = {
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.name = "s6000-audio",
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.pcm_ops = &s6000_pcm_ops,
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.pcm_new = s6000_pcm_new,
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.pcm_free = s6000_pcm_free,
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};
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EXPORT_SYMBOL_GPL(s6000_soc_platform);
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static int __init s6000_pcm_init(void)
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|
{
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return snd_soc_register_platform(&s6000_soc_platform);
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}
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module_init(s6000_pcm_init);
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|
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static void __exit s6000_pcm_exit(void)
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|
{
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|
snd_soc_unregister_platform(&s6000_soc_platform);
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}
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|
module_exit(s6000_pcm_exit);
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|
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MODULE_AUTHOR("Daniel Gloeckner");
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MODULE_DESCRIPTION("Stretch s6000 family PCM DMA module");
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|
MODULE_LICENSE("GPL");
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