C++ snd_pcm_period_elapsed函数代码示例

static irqreturn_t lpass_platform_lpaif_irq(int irq, void *data)
{
	struct snd_pcm_substream *substream = data;
	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;
	struct lpass_data *drvdata =
		snd_soc_platform_get_drvdata(soc_runtime->platform);
	unsigned int interrupts;
	irqreturn_t ret = IRQ_NONE;
	int rv;

	rv = regmap_read(drvdata->lpaif_map,
			LPAIF_IRQSTAT_REG(LPAIF_IRQ_PORT_HOST), &interrupts);
	if (rv) {
		dev_err(soc_runtime->dev, "%s() error reading from irqstat reg: %d\n",
				__func__, rv);
		return IRQ_NONE;
	}
	interrupts &= LPAIF_IRQ_ALL(LPAIF_RDMA_CHAN_MI2S);

	if (interrupts & LPAIF_IRQ_PER(LPAIF_RDMA_CHAN_MI2S)) {
		rv = regmap_write(drvdata->lpaif_map,
				LPAIF_IRQCLEAR_REG(LPAIF_IRQ_PORT_HOST),
				LPAIF_IRQ_PER(LPAIF_RDMA_CHAN_MI2S));
		if (rv) {
			dev_err(soc_runtime->dev, "%s() error writing to irqclear reg: %d\n",
					__func__, rv);
			return IRQ_NONE;
		}
		snd_pcm_period_elapsed(substream);
		ret = IRQ_HANDLED;
	}

	if (interrupts & LPAIF_IRQ_XRUN(LPAIF_RDMA_CHAN_MI2S)) {
		rv = regmap_write(drvdata->lpaif_map,
				LPAIF_IRQCLEAR_REG(LPAIF_IRQ_PORT_HOST),
				LPAIF_IRQ_XRUN(LPAIF_RDMA_CHAN_MI2S));
		if (rv) {
			dev_err(soc_runtime->dev, "%s() error writing to irqclear reg: %d\n",
					__func__, rv);
			return IRQ_NONE;
		}
		dev_warn(soc_runtime->dev, "%s() xrun warning\n", __func__);
		snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
		ret = IRQ_HANDLED;
	}

	if (interrupts & LPAIF_IRQ_ERR(LPAIF_RDMA_CHAN_MI2S)) {
		rv = regmap_write(drvdata->lpaif_map,
				LPAIF_IRQCLEAR_REG(LPAIF_IRQ_PORT_HOST),
				LPAIF_IRQ_ERR(LPAIF_RDMA_CHAN_MI2S));
		if (rv) {
			dev_err(soc_runtime->dev, "%s() error writing to irqclear reg: %d\n",
					__func__, rv);
			return IRQ_NONE;
		}
		dev_err(soc_runtime->dev, "%s() bus access error\n", __func__);
		snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
		ret = IRQ_HANDLED;
	}

	return ret;
}

static void pcm_afe_process_rx_pkt(uint32_t opcode,
		uint32_t token, uint32_t *payload,
		 void *priv)
{
	struct pcm_afe_info *prtd = priv;
	unsigned long dsp_flags;
	struct snd_pcm_substream *substream = NULL;
	struct snd_pcm_runtime *runtime = NULL;
	uint16_t event;

	if (prtd == NULL)
		return;
	substream =  prtd->substream;
	runtime = substream->runtime;
	pr_debug("%s\n", __func__);
	spin_lock_irqsave(&prtd->dsp_lock, dsp_flags);
	switch (opcode) {
	case AFE_EVENT_RT_PROXY_PORT_STATUS: {
		event = (uint16_t)((0xFFFF0000 & payload[0]) >> 0x10);
		switch (event) {
		case AFE_EVENT_RTPORT_START: {
			prtd->dsp_cnt = 0;
			prtd->poll_time = ((unsigned long)((
				snd_pcm_lib_period_bytes(prtd->substream)
					* 1000 * 1000)/(runtime->rate
					* runtime->channels * 2)));
			hrtimer_start(&prtd->hrt,
				ns_to_ktime(0),
				HRTIMER_MODE_REL);
			pr_debug("prtd->poll_time : %d", prtd->poll_time);
			break;
		}
		case AFE_EVENT_RTPORT_STOP:
			pr_debug("%s: event!=0\n", __func__);
			prtd->start = 0;
			snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
			break;
		case AFE_EVENT_RTPORT_LOW_WM:
			pr_debug("%s: Underrun\n", __func__);
			break;
		case AFE_EVENT_RTPORT_HI_WM:
			pr_debug("%s: Overrun\n", __func__);
			break;
		default:
			break;
		}
		break;
	}
	case APR_BASIC_RSP_RESULT: {
		switch (payload[0]) {
		case AFE_PORT_DATA_CMD_RT_PROXY_PORT_READ_V2:
			pr_debug("Read done\n");
			prtd->pcm_irq_pos += snd_pcm_lib_period_bytes
							(prtd->substream);
			snd_pcm_period_elapsed(prtd->substream);
			break;
		default:
			break;
		}
		break;
	}
	default:
		break;
	}
	spin_unlock_irqrestore(&prtd->dsp_lock, dsp_flags);
}

irqreturn_t bcm947xx_i2s_isr(int irq, void *devid)
{
	uint32 intstatus, intmask;
	uint32 intstatus_new = 0;
	uint32 int_errmask = I2S_INT_DESCERR | I2S_INT_DATAERR | I2S_INT_DESC_PROTO_ERR |
	        I2S_INT_SPDIF_PAR_ERR;
	struct snd_pcm *pcm = devid;
	struct snd_soc_pcm_runtime *rtd = pcm->private_data;
	bcm947xx_i2s_info_t *snd_bcm = rtd->dai->cpu_dai->private_data;
	struct snd_pcm_substream *substream;
	struct bcm947xx_runtime_data *brtd;

//	DBG("%s enter\n", __FUNCTION__);

	intstatus = R_REG(snd_bcm->osh, &snd_bcm->regs->intstatus);

	if (BCM947XX_PCM_DEBUG_ON) {
		intmask = R_REG(snd_bcm->osh, &snd_bcm->regs->intmask);
	} else {
		(void)intmask;
	}

//	DBG("%s: intstatus 0x%x intmask 0x%x\n", __FUNCTION__, intstatus, intmask);

	/* Playback. */
	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
	if ((brtd = bcm947xx_pcm_brtd_from_running_substream(substream))) {

		if (intstatus & I2S_INT_XMT_INT) {
			/* reclaim descriptors that have been TX'd */
			spin_lock(&brtd->lock);
			dma_getnexttxp(snd_bcm->di[0], HNDDMA_RANGE_TRANSMITTED);
			spin_unlock(&brtd->lock);

			/* clear this bit by writing a "1" back, we've serviced this */
			intstatus_new |= I2S_INT_XMT_INT;

			snd_pcm_period_elapsed(substream);
		
			spin_lock(&brtd->lock);
			snd_BUG_ON(0 == brtd->dma_loaded);
			brtd->dma_loaded--;
			spin_unlock(&brtd->lock);
		}

		if (intstatus & I2S_INT_XMTFIFO_UFLOW) {
			intstatus_new |= I2S_INT_XMTFIFO_UFLOW;
			bcm947xx_dma_abort(substream);
		}
	}

	/* Capture. */
	substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
	if ((brtd = bcm947xx_pcm_brtd_from_running_substream(substream))) {

		if (intstatus & I2S_INT_RCV_INT) {

			spin_lock(&brtd->lock);
			dma_getnextrxp(snd_bcm->di[0], false);
			spin_unlock(&brtd->lock);

			/* clear this bit by writing a "1" back, we've serviced this */
			intstatus_new |= I2S_INT_RCV_INT;

			snd_pcm_period_elapsed(substream);

			spin_lock(&brtd->lock);
			snd_BUG_ON(0 == brtd->dma_loaded);
			brtd->dma_loaded--;
			spin_unlock(&brtd->lock);
		}

		if (intstatus & I2S_INT_RCVFIFO_OFLOW) {
			intstatus_new |= I2S_INT_RCVFIFO_OFLOW;
			bcm947xx_dma_abort(substream);
		}
	}
	
	/* Common.*/
	if (intstatus & int_errmask) {
		DBG("\n\n%s: Turning off all interrupts due to error\n", __FUNCTION__);
		DBG("%s: intstatus 0x%x intmask 0x%x\n", __FUNCTION__, intstatus, intmask);


		/* something bad happened, turn off all interrupts */
		W_REG(snd_bcm->osh, &snd_bcm->regs->intmask, 0);
	}

	/* Acknowledge interrupts. */
	W_REG(snd_bcm->osh, &snd_bcm->regs->intstatus, intstatus_new);

//	DBG("%s exit\n", __FUNCTION__);

	return IRQ_RETVAL(intstatus);
}

/* This function is called by the DMA driver. */
static void atmel_ac97c_dma_playback_period_done(void *arg)
{
	struct atmel_ac97c *chip = arg;
	snd_pcm_period_elapsed(chip->playback_substream);
}

static void pcm_afe_process_rx_pkt(uint32_t opcode,
		uint32_t token, uint32_t *payload,
		 void *priv)
{
	struct pcm_afe_info *prtd = priv;
	unsigned long dsp_flags;
	struct snd_pcm_substream *substream = NULL;
	struct snd_pcm_runtime *runtime = NULL;
	uint16_t event;
	uint64_t period_bytes;
	uint64_t bytes_one_sec;

	if (prtd == NULL)
		return;
	substream =  prtd->substream;
	runtime = substream->runtime;
	pr_debug("%s\n", __func__);
	spin_lock_irqsave(&prtd->dsp_lock, dsp_flags);
	switch (opcode) {
	case AFE_EVENT_RT_PROXY_PORT_STATUS: {
		event = (uint16_t)((0xFFFF0000 & payload[0]) >> 0x10);
		switch (event) {
		case AFE_EVENT_RTPORT_START: {
			prtd->dsp_cnt = 0;
			/* Calculate poll time. Split steps to avoid overflow.
			 * Poll time-time corresponding to one period in bytes.
			 * (Samplerate * channelcount * format)=bytes in 1 sec.
			 * Poll time =  (period bytes / bytes in one sec) *
			 * 1000000 micro seconds.
			 * Multiplication by 1000000 is done in two steps to
			 * keep the accuracy of poll time.
			 */
			period_bytes = ((uint64_t)(
				(snd_pcm_lib_period_bytes(prtd->substream)) *
				 1000));
			bytes_one_sec = (runtime->rate * runtime->channels * 2);
			bytes_one_sec = div_u64(bytes_one_sec , 1000);
			prtd->poll_time =
				div_u64(period_bytes, bytes_one_sec);
			pr_debug("prtd->poll_time : %d\n", prtd->poll_time);
			break;
		}
		case AFE_EVENT_RTPORT_STOP:
			pr_debug("%s: event!=0\n", __func__);
			prtd->start = 0;
			snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
			break;
		case AFE_EVENT_RTPORT_LOW_WM:
			pr_debug("%s: Underrun\n", __func__);
			break;
		case AFE_EVENT_RTPORT_HI_WM:
			pr_debug("%s: Overrun\n", __func__);
			break;
		default:
			break;
		}
		break;
	}
	case APR_BASIC_RSP_RESULT: {
		switch (payload[0]) {
		case AFE_PORT_DATA_CMD_RT_PROXY_PORT_READ_V2:
			pr_debug("Read done\n");
			prtd->pcm_irq_pos += snd_pcm_lib_period_bytes
							(prtd->substream);
			snd_pcm_period_elapsed(prtd->substream);
			break;
		default:
			break;
		}
		break;
	}
	default:
		break;
	}
	spin_unlock_irqrestore(&prtd->dsp_lock, dsp_flags);
}

static int saudio_data_transfer_process(struct saudio_stream *stream,
					struct saudio_msg *msg)
{
	struct snd_pcm_runtime *runtime = stream->substream->runtime;
	struct sblock blk = { 0 };
	int32_t result = 0;
	struct cmd_common *common = NULL;

	int32_t elapsed_blks = 0;
	int32_t periods_avail;
	int32_t periods_tosend;
	int32_t cur_blk_count = 0;

	cur_blk_count = sblock_get_free_count(stream->dst, stream->channel);

	elapsed_blks =
	    (cur_blk_count + stream->last_getblk_count - stream->blk_count) -
	    stream->last_elapsed_count;

	if (stream->stream_id == SNDRV_PCM_STREAM_PLAYBACK) {
		periods_avail = snd_pcm_playback_avail(runtime) /
		    runtime->period_size;
	} else {
		periods_avail = snd_pcm_capture_avail(runtime) /
		    runtime->period_size;
	}

	periods_tosend = stream->periods_avail - periods_avail;
	if (periods_tosend > 0) {
		stream->periods_tosend += periods_tosend;
	}

	if (stream->periods_tosend) {
		while (stream->periods_tosend) {
			result =
			    sblock_get(stream->dst, stream->channel, &blk, 0);
			if (result) {
				break;
			}
			stream->last_getblk_count++;
			common = (struct cmd_common *)blk.addr;
			blk.length =
			    frames_to_bytes(runtime, runtime->period_size);
			common->command = SAUDIO_DATA_PCM;
			common->sub_cmd = stream->stream_id;
			common->reserved1 =
			    stream->substream->dma_buffer.addr +
			    stream->period * blk.length;

			sblock_send(stream->dst, stream->channel, &blk);

			stream->periods_tosend--;
			stream->period++;
			stream->period = stream->period % runtime->periods;
		}

	} else {
		pr_debug("saudio.c: saudio no data to send ");
		if (sblock_get_free_count(stream->dst, stream->channel) ==
		    SAUDIO_STREAM_BLOCK_COUNT) {
			pr_debug
			    ("saudio.c: saudio no data to send and  is empty ");
			result =
			    sblock_get(stream->dst, stream->channel, &blk, 0);
			if (result) {
				ETRACE("saudio.c: no data and no blk\n");
			} else {
				stream->last_getblk_count++;
				common = (struct cmd_common *)blk.addr;
				common->command = SAUDIO_DATA_SILENCE;
				common->sub_cmd = stream->stream_id;

				sblock_send(stream->dst, stream->channel, &blk);
				stream->last_elapsed_count++;
				schedule_timeout_interruptible(msecs_to_jiffies(5));
			}
		}
	}

	while (elapsed_blks > 0) {
		elapsed_blks--;
		stream->hwptr_done++;
		stream->hwptr_done %= runtime->periods;
		snd_pcm_period_elapsed(stream->substream);
		stream->periods_avail++;
		stream->last_elapsed_count++;
	}

	return 0;
}

static void ivtv_alsa_announce_pcm_data(struct snd_ivtv_card *itvsc,
					u8 *pcm_data,
					size_t num_bytes)
{
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
	unsigned int oldptr;
	unsigned int stride;
	int period_elapsed = 0;
	int length;

	dprintk("ivtv alsa announce ptr=%p data=%p num_bytes=%zu\n", itvsc,
		pcm_data, num_bytes);

	substream = itvsc->capture_pcm_substream;
	if (substream == NULL) {
		dprintk("substream was NULL\n");
		return;
	}

	runtime = substream->runtime;
	if (runtime == NULL) {
		dprintk("runtime was NULL\n");
		return;
	}

	stride = runtime->frame_bits >> 3;
	if (stride == 0) {
		dprintk("stride is zero\n");
		return;
	}

	length = num_bytes / stride;
	if (length == 0) {
		dprintk("%s: length was zero\n", __func__);
		return;
	}

	if (runtime->dma_area == NULL) {
		dprintk("dma area was NULL - ignoring\n");
		return;
	}

	oldptr = itvsc->hwptr_done_capture;
	if (oldptr + length >= runtime->buffer_size) {
		unsigned int cnt =
			runtime->buffer_size - oldptr;
		memcpy(runtime->dma_area + oldptr * stride, pcm_data,
		       cnt * stride);
		memcpy(runtime->dma_area, pcm_data + cnt * stride,
		       length * stride - cnt * stride);
	} else {
		memcpy(runtime->dma_area + oldptr * stride, pcm_data,
		       length * stride);
	}
	snd_pcm_stream_lock(substream);

	itvsc->hwptr_done_capture += length;
	if (itvsc->hwptr_done_capture >=
	    runtime->buffer_size)
		itvsc->hwptr_done_capture -=
			runtime->buffer_size;

	itvsc->capture_transfer_done += length;
	if (itvsc->capture_transfer_done >=
	    runtime->period_size) {
		itvsc->capture_transfer_done -=
			runtime->period_size;
		period_elapsed = 1;
	}

	snd_pcm_stream_unlock(substream);

	if (period_elapsed)
		snd_pcm_period_elapsed(substream);
}

static void snd_msnd_eval_dsp_msg(struct snd_msnd *chip, u16 wMessage)
{
	switch (HIBYTE(wMessage)) {
	case HIMT_PLAY_DONE: {
		if (chip->banksPlayed < 3)
			snd_printdd("%08X: HIMT_PLAY_DONE: %i\n",
				(unsigned)jiffies, LOBYTE(wMessage));

		if (chip->last_playbank == LOBYTE(wMessage)) {
			snd_printdd("chip.last_playbank == LOBYTE(wMessage)\n");
			break;
		}
		chip->banksPlayed++;

		if (test_bit(F_WRITING, &chip->flags))
			snd_msnd_DAPQ(chip, 0);

		chip->last_playbank = LOBYTE(wMessage);
		chip->playDMAPos += chip->play_period_bytes;
		if (chip->playDMAPos > chip->playLimit)
			chip->playDMAPos = 0;
		snd_pcm_period_elapsed(chip->playback_substream);

		break;
	}
	case HIMT_RECORD_DONE:
		if (chip->last_recbank == LOBYTE(wMessage))
			break;
		chip->last_recbank = LOBYTE(wMessage);
		chip->captureDMAPos += chip->capturePeriodBytes;
		if (chip->captureDMAPos > (chip->captureLimit))
			chip->captureDMAPos = 0;

		if (test_bit(F_READING, &chip->flags))
			snd_msnd_DARQ(chip, chip->last_recbank);

		snd_pcm_period_elapsed(chip->capture_substream);
		break;

	case HIMT_DSP:
		switch (LOBYTE(wMessage)) {
#ifndef MSND_CLASSIC
		case HIDSP_PLAY_UNDER:
#endif
		case HIDSP_INT_PLAY_UNDER:
			snd_printd(KERN_WARNING LOGNAME ": Play underflow %i\n",
				chip->banksPlayed);
			if (chip->banksPlayed > 2)
				clear_bit(F_WRITING, &chip->flags);
			break;

		case HIDSP_INT_RECORD_OVER:
			snd_printd(KERN_WARNING LOGNAME ": Record overflow\n");
			clear_bit(F_READING, &chip->flags);
			break;

		default:
			snd_printd(KERN_WARNING LOGNAME
				   ": DSP message %d 0x%02x\n",
				   LOBYTE(wMessage), LOBYTE(wMessage));
			break;
		}
		break;

	case HIMT_MIDI_IN_UCHAR:
		if (chip->msndmidi_mpu)
			snd_msndmidi_input_read(chip->msndmidi_mpu);
		break;

	default:
		snd_printd(KERN_WARNING LOGNAME ": HIMT message %d 0x%02x\n",
			   HIBYTE(wMessage), HIBYTE(wMessage));
		break;
	}
}

/*
 * the period ack.  update the substream.
 */
static void snd_atiixp_update_dma(struct atiixp *chip, struct atiixp_dma *dma)
{
	if (! dma->substream || ! dma->running)
		return;
	snd_pcm_period_elapsed(dma->substream);
}

    static void
vaudio_intr_data (void* cookie, NkXIrq xirq)
{
    struct vaudio_stream* s = (struct vaudio_stream*) cookie;
    NkDevRing*   ring   = s->ring;
    nku32_f	 oresp  = s->resp;
    const nku32_f mask   = ring->imask;
    const nku32_f nresp  = ring->iresp;
    bool	 trigger = 0;
#if VAUDIO_PROC_SYNC
    if (vaudio_sync_force_close &&
        s->stream->pcm->device == 0 &&
        s->stream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
        while (vaudio_send_data(s) >= 0);
        // memset(s->stream->dma_buffer.area, 0, NK_VAUDIO_MAX_RING_SIZE);
        return;
    }
#endif
    (void) xirq;
    if (s->active) {
	struct snd_pcm_runtime* runtime = s->stream->runtime;
	int periods_avail;
	int periods_tosend;

	if (s->stream_id == SNDRV_PCM_STREAM_PLAYBACK) {
	    periods_avail = snd_pcm_playback_avail(runtime) /
				    runtime->period_size;
	} else {
	    periods_avail = snd_pcm_capture_avail(runtime) /
				    runtime->period_size;
	}
	DTRACE ("%d %d %d\n",
		s->periods_avail, periods_avail, s->periods_tosend);
	periods_tosend = s->periods_avail - periods_avail;
	if (periods_tosend > 0) {
	    s->periods_tosend += periods_tosend;
	}
	s->periods_avail = periods_avail;
	while (s->periods_tosend) {
	    const int res = vaudio_send_data(s);
	    if (res < 0) break;
	    if (res == 1) trigger = 1;
	    s->periods_tosend--;
	}
    }
    while (oresp != nresp) {
	NkRingDesc*  desc = s->rbase + (oresp & mask);

	if (desc->status == (nku32_f) NK_VAUDIO_STATUS_ERROR) {
	    snd_pcm_stop(s->stream, SNDRV_PCM_STATE_XRUN);
	} else {
	    if (s->active) {
		struct snd_pcm_runtime* runtime = s->stream->runtime;

		s->hwptr_done++;
		s->hwptr_done %= runtime->periods;
		snd_pcm_period_elapsed(s->stream);
		s->periods_avail++;
	    }
	}
	oresp++;
    }
    s->resp = oresp;
    if (trigger) {
	nkops.nk_xirq_trigger(ring->cxirq, s->vaudio->vlink->s_id);
    }
}

static void atmel_ac97c_dma_capture_period_done(void *arg)
{
	struct atmel_ac97c *chip = arg;
	snd_pcm_period_elapsed(chip->capture_substream);
}

/* This function is called by the DMA driver. */
static void atmel_abdac_dma_period_done(void *arg)
{
	struct atmel_abdac *dac = arg;
	snd_pcm_period_elapsed(dac->substream);
}

static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
{
	struct atmel_ac97c	*chip  = (struct atmel_ac97c *)dev;
	irqreturn_t		retval = IRQ_NONE;
	u32			sr     = ac97c_readl(chip, SR);
	u32			casr   = ac97c_readl(chip, CASR);
	u32			cosr   = ac97c_readl(chip, COSR);
	u32			camr   = ac97c_readl(chip, CAMR);

	if (sr & AC97C_SR_CAEVT) {
		struct snd_pcm_runtime *runtime;
		int offset, next_period, block_size;
		dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
				casr & AC97C_CSR_OVRUN   ? " OVRUN"   : "",
				casr & AC97C_CSR_RXRDY   ? " RXRDY"   : "",
				casr & AC97C_CSR_UNRUN   ? " UNRUN"   : "",
				casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
				casr & AC97C_CSR_TXRDY   ? " TXRDY"   : "",
				!casr                    ? " NONE"    : "");
		if (!cpu_is_at32ap7000()) {
			if ((casr & camr) & AC97C_CSR_ENDTX) {
				runtime = chip->playback_substream->runtime;
				block_size = frames_to_bytes(runtime,
						runtime->period_size);
				chip->playback_period++;

				if (chip->playback_period == runtime->periods)
					chip->playback_period = 0;
				next_period = chip->playback_period + 1;
				if (next_period == runtime->periods)
					next_period = 0;

				offset = block_size * next_period;

				writel(runtime->dma_addr + offset,
						chip->regs + ATMEL_PDC_TNPR);
				writel(block_size / 2,
						chip->regs + ATMEL_PDC_TNCR);

				snd_pcm_period_elapsed(
						chip->playback_substream);
			}
			if ((casr & camr) & AC97C_CSR_ENDRX) {
				runtime = chip->capture_substream->runtime;
				block_size = frames_to_bytes(runtime,
						runtime->period_size);
				chip->capture_period++;

				if (chip->capture_period == runtime->periods)
					chip->capture_period = 0;
				next_period = chip->capture_period + 1;
				if (next_period == runtime->periods)
					next_period = 0;

				offset = block_size * next_period;

				writel(runtime->dma_addr + offset,
						chip->regs + ATMEL_PDC_RNPR);
				writel(block_size / 2,
						chip->regs + ATMEL_PDC_RNCR);
				snd_pcm_period_elapsed(chip->capture_substream);
			}
		}
		retval = IRQ_HANDLED;
	}

	if (sr & AC97C_SR_COEVT) {
		dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
				cosr & AC97C_CSR_OVRUN   ? " OVRUN"   : "",
				cosr & AC97C_CSR_RXRDY   ? " RXRDY"   : "",
				cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
				cosr & AC97C_CSR_TXRDY   ? " TXRDY"   : "",
				!cosr                    ? " NONE"    : "");
		retval = IRQ_HANDLED;
	}

	if (retval == IRQ_NONE) {
		dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
				"casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
	}

	return retval;
}

/*
 * intel_alsa_ifx_dma_capture_complete - End of capture callback
 * called in DMA Complete Tasklet context
 * This Callback has in charge of re-programming a new read request to
 * Intel MID I2S Driver if the stream has not been Closed.
 * It calls also the snd_pcm_period_elapsed if the stream is not
 * PAUSED or SUSPENDED to inform ALSA Kernel that the Ring Buffer
 * period has been received properly
 *
 * Input parameters
 *		@param : pointer to a structure
 * Output parameters
 *		@ret_val : status
 */
int intel_alsa_ifx_dma_capture_complete(void *param)
{
	struct intel_alsa_ssp_dma_buf *sb_rx;
	struct intel_alsa_ifx_stream_info *str_info;
	bool call_back = false;
	bool reset_index = false;

	WARN(!param, "ALSA IFX: ERROR param NULL\n");
	if (!param)
		return -EBUSY;

	str_info = param;
	sb_rx = &(str_info->dma_slot);

	if (test_and_clear_bit(INTEL_ALSA_SSP_STREAM_RUNNING, &str_info->stream_status)) {
			if (test_and_clear_bit(INTEL_ALSA_SSP_STREAM_DROPPED, &str_info->stream_status)) {
				if (test_bit(INTEL_ALSA_SSP_STREAM_STARTED, &str_info->stream_status)) {
					/*
					 * the stream has been dropped and
					 * restarted before the callback occurs
					 * in this case the we have to reprogram the requests
					 * to SSP driver and reset the stream's indexes
					 */
					call_back = true;
					reset_index = true;
				} else
					call_back = false;
			} else {
				if (test_bit(INTEL_ALSA_SSP_STREAM_STARTED, &str_info->stream_status)) {
					/*
					 * the stream is on going
					 */
					call_back = true;
				} else {
					WARN(1, "ALSA_IFX: FCT %s spurious"
						"playback DMA complete 1 ?!\n",
						__func__);
					return -EBUSY;
				}
			}
		} else {
			WARN(1, "ALSA_IFX: FCT %s spurious playback DMA complete 2 ?!\n",
					__func__);
			return -EBUSY;
		}

	if (call_back == true) {
		pr_debug("ALSA_IFX: playback (REQ=%d,CB=%d): PLAYBACK_DMA_REQ_COMPLETE\n",
				sb_rx->period_req_index,
				sb_rx->period_cb_index);

		if (reset_index) {
			sb_rx->period_cb_index = 0;
			sb_rx->period_req_index = 0;
		} else if (++(sb_rx->period_cb_index) >= sb_rx->period_index_max)
			sb_rx->period_cb_index = 0;

		/*
		 * Launch the next Playback request if no
		 * CLOSE has been requested
		 */
		intel_alsa_ifx_dma_capture_req(str_info);
		/*
		 * Call the snd_pcm_period_elapsed to inform ALSA kernel
		 * that a ring buffer period has been played
		 */
		snd_pcm_period_elapsed(str_info->substream);

	}
	return 0;
} /* intel_alsa_ifx_dma_capture_complete */

static void aml_i2s_timer_callback(unsigned long data)
{
    struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
    struct snd_pcm_runtime *runtime = substream->runtime;
    struct aml_runtime_data *prtd = runtime->private_data;
    audio_stream_t *s = &prtd->s;

    unsigned int last_ptr, size = 0;
    if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
        if (s->active == 1) {
            spin_lock(&s->lock);
            if (s->device_type == AML_AUDIO_I2SOUT) {
                last_ptr = read_i2s_rd_ptr();
            } else {
                last_ptr = read_iec958_rd_ptr();
            }
            if (last_ptr < s->last_ptr) {
                size = runtime->dma_bytes + last_ptr - (s->last_ptr);
            } else {
                size = last_ptr - (s->last_ptr);
            }
            s->last_ptr = last_ptr;
            s->size += bytes_to_frames(substream->runtime, size);
            if (s->size >= runtime->period_size) {
                s->size %= runtime->period_size;
                spin_unlock(&s->lock);
                snd_pcm_period_elapsed(substream);
                spin_lock(&s->lock);
            }
            mod_timer(&prtd->timer, jiffies + 1);
            spin_unlock(&s->lock);
        } else {
            mod_timer(&prtd->timer, jiffies + 1);
        }
    } else {
        if (s->active == 1) {
            spin_lock(&s->lock);
            if (s->device_type == AML_AUDIO_I2SIN) {
                last_ptr = audio_in_i2s_wr_ptr() ;
            } else {
                last_ptr = audio_in_spdif_wr_ptr();
            }
            if (last_ptr < s->last_ptr) {
                size = runtime->dma_bytes + (last_ptr - (s->last_ptr)) / 2;
            } else if (last_ptr == s->last_ptr) {
                if (s->xrun_num++ > 100) {
                    printk(KERN_INFO "alsa capture long time no data, quit xrun!\n");
                    s->xrun_num = 0;
                    s->size = runtime->period_size;
                }
            } else {
                size = (last_ptr - (s->last_ptr)) / 2;
            }
            s->last_ptr = last_ptr;
            s->size += bytes_to_frames(substream->runtime, size);
            if (s->size >= runtime->period_size) {
                s->size %= runtime->period_size;
                spin_unlock(&s->lock);
                snd_pcm_period_elapsed(substream);
                spin_lock(&s->lock);
            }
            mod_timer(&prtd->timer, jiffies + 1);
            spin_unlock(&s->lock);
        } else {
            mod_timer(&prtd->timer, jiffies + 1);
        }
    }
}