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454 lines
13 KiB
454 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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// |
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// Freescale MPC5200 PSC DMA |
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// ALSA SoC Platform driver |
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// |
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// Copyright (C) 2008 Secret Lab Technologies Ltd. |
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// Copyright (C) 2009 Jon Smirl, Digispeaker |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/slab.h> |
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#include <linux/of_address.h> |
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#include <linux/of_irq.h> |
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#include <linux/of_platform.h> |
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#include <sound/soc.h> |
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#include <linux/fsl/bestcomm/bestcomm.h> |
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#include <linux/fsl/bestcomm/gen_bd.h> |
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#include <asm/mpc52xx_psc.h> |
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#include "mpc5200_dma.h" |
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#define DRV_NAME "mpc5200_dma" |
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/* |
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* Interrupt handlers |
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*/ |
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static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma) |
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{ |
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struct psc_dma *psc_dma = _psc_dma; |
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struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
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u16 isr; |
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isr = in_be16(®s->mpc52xx_psc_isr); |
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/* Playback underrun error */ |
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if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP)) |
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psc_dma->stats.underrun_count++; |
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/* Capture overrun error */ |
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if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR)) |
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psc_dma->stats.overrun_count++; |
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out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT); |
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return IRQ_HANDLED; |
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} |
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/** |
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* psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer |
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* @s: pointer to stream private data structure |
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* |
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* Enqueues another audio period buffer into the bestcomm queue. |
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* |
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* Note: The routine must only be called when there is space available in |
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* the queue. Otherwise the enqueue will fail and the audio ring buffer |
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* will get out of sync |
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*/ |
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static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s) |
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{ |
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struct bcom_bd *bd; |
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/* Prepare and enqueue the next buffer descriptor */ |
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bd = bcom_prepare_next_buffer(s->bcom_task); |
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bd->status = s->period_bytes; |
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bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes); |
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bcom_submit_next_buffer(s->bcom_task, NULL); |
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/* Update for next period */ |
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s->period_next = (s->period_next + 1) % s->runtime->periods; |
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} |
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/* Bestcomm DMA irq handler */ |
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static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream) |
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{ |
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struct psc_dma_stream *s = _psc_dma_stream; |
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spin_lock(&s->psc_dma->lock); |
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/* For each finished period, dequeue the completed period buffer |
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* and enqueue a new one in it's place. */ |
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while (bcom_buffer_done(s->bcom_task)) { |
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bcom_retrieve_buffer(s->bcom_task, NULL, NULL); |
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s->period_current = (s->period_current+1) % s->runtime->periods; |
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s->period_count++; |
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psc_dma_bcom_enqueue_next_buffer(s); |
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} |
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spin_unlock(&s->psc_dma->lock); |
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/* If the stream is active, then also inform the PCM middle layer |
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* of the period finished event. */ |
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if (s->active) |
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snd_pcm_period_elapsed(s->stream); |
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return IRQ_HANDLED; |
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} |
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/** |
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* psc_dma_trigger: start and stop the DMA transfer. |
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* |
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* This function is called by ALSA to start, stop, pause, and resume the DMA |
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* transfer of data. |
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*/ |
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static int psc_dma_trigger(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream, int cmd) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); |
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struct snd_pcm_runtime *runtime = substream->runtime; |
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struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); |
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struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
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u16 imr; |
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unsigned long flags; |
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int i; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n", |
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substream->pstr->stream, runtime->frame_bits, |
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(int)runtime->period_size, runtime->periods); |
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s->period_bytes = frames_to_bytes(runtime, |
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runtime->period_size); |
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s->period_next = 0; |
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s->period_current = 0; |
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s->active = 1; |
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s->period_count = 0; |
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s->runtime = runtime; |
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/* Fill up the bestcomm bd queue and enable DMA. |
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* This will begin filling the PSC's fifo. |
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*/ |
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spin_lock_irqsave(&psc_dma->lock, flags); |
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) |
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bcom_gen_bd_rx_reset(s->bcom_task); |
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else |
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bcom_gen_bd_tx_reset(s->bcom_task); |
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for (i = 0; i < runtime->periods; i++) |
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if (!bcom_queue_full(s->bcom_task)) |
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psc_dma_bcom_enqueue_next_buffer(s); |
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bcom_enable(s->bcom_task); |
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spin_unlock_irqrestore(&psc_dma->lock, flags); |
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out_8(®s->command, MPC52xx_PSC_RST_ERR_STAT); |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n", |
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substream->pstr->stream, s->period_count); |
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s->active = 0; |
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spin_lock_irqsave(&psc_dma->lock, flags); |
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bcom_disable(s->bcom_task); |
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) |
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bcom_gen_bd_rx_reset(s->bcom_task); |
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else |
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bcom_gen_bd_tx_reset(s->bcom_task); |
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spin_unlock_irqrestore(&psc_dma->lock, flags); |
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break; |
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default: |
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dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n", |
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substream->pstr->stream, cmd); |
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return -EINVAL; |
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} |
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/* Update interrupt enable settings */ |
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imr = 0; |
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if (psc_dma->playback.active) |
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imr |= MPC52xx_PSC_IMR_TXEMP; |
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if (psc_dma->capture.active) |
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imr |= MPC52xx_PSC_IMR_ORERR; |
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out_be16(®s->isr_imr.imr, psc_dma->imr | imr); |
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return 0; |
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} |
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/* --------------------------------------------------------------------- |
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* The PSC DMA 'ASoC platform' driver |
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* |
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* Can be referenced by an 'ASoC machine' driver |
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* This driver only deals with the audio bus; it doesn't have any |
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* interaction with the attached codec |
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*/ |
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static const struct snd_pcm_hardware psc_dma_hardware = { |
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.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | |
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SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
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SNDRV_PCM_INFO_BATCH, |
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.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | |
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SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE, |
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.period_bytes_max = 1024 * 1024, |
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.period_bytes_min = 32, |
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.periods_min = 2, |
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.periods_max = 256, |
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.buffer_bytes_max = 2 * 1024 * 1024, |
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.fifo_size = 512, |
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}; |
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static int psc_dma_open(struct snd_soc_component *component, |
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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 snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); |
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struct psc_dma_stream *s; |
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int rc; |
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dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream); |
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) |
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s = &psc_dma->capture; |
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else |
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s = &psc_dma->playback; |
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snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware); |
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rc = snd_pcm_hw_constraint_integer(runtime, |
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SNDRV_PCM_HW_PARAM_PERIODS); |
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if (rc < 0) { |
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dev_err(substream->pcm->card->dev, "invalid buffer size\n"); |
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return rc; |
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} |
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s->stream = substream; |
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return 0; |
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} |
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static int psc_dma_close(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); |
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struct psc_dma_stream *s; |
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dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream); |
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) |
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s = &psc_dma->capture; |
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else |
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s = &psc_dma->playback; |
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if (!psc_dma->playback.active && |
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!psc_dma->capture.active) { |
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/* Disable all interrupts and reset the PSC */ |
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out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); |
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out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */ |
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} |
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s->stream = NULL; |
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return 0; |
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} |
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static snd_pcm_uframes_t |
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psc_dma_pointer(struct snd_soc_component *component, |
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struct snd_pcm_substream *substream) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); |
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struct psc_dma_stream *s; |
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dma_addr_t count; |
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) |
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s = &psc_dma->capture; |
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else |
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s = &psc_dma->playback; |
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count = s->period_current * s->period_bytes; |
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return bytes_to_frames(substream->runtime, count); |
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} |
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static int psc_dma_new(struct snd_soc_component *component, |
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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_soc_dai *dai = asoc_rtd_to_cpu(rtd, 0); |
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struct snd_pcm *pcm = rtd->pcm; |
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size_t size = psc_dma_hardware.buffer_bytes_max; |
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int rc; |
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dev_dbg(component->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n", |
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card, dai, pcm); |
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rc = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32)); |
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if (rc) |
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return rc; |
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return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, card->dev, |
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size); |
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} |
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static const struct snd_soc_component_driver mpc5200_audio_dma_component = { |
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.name = DRV_NAME, |
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.open = psc_dma_open, |
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.close = psc_dma_close, |
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.pointer = psc_dma_pointer, |
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.trigger = psc_dma_trigger, |
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.pcm_construct = psc_dma_new, |
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}; |
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int mpc5200_audio_dma_create(struct platform_device *op) |
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{ |
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phys_addr_t fifo; |
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struct psc_dma *psc_dma; |
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struct resource res; |
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int size, irq, rc; |
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const __be32 *prop; |
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void __iomem *regs; |
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int ret; |
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/* Fetch the registers and IRQ of the PSC */ |
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irq = irq_of_parse_and_map(op->dev.of_node, 0); |
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if (of_address_to_resource(op->dev.of_node, 0, &res)) { |
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dev_err(&op->dev, "Missing reg property\n"); |
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return -ENODEV; |
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} |
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regs = ioremap(res.start, resource_size(&res)); |
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if (!regs) { |
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dev_err(&op->dev, "Could not map registers\n"); |
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return -ENODEV; |
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} |
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/* Allocate and initialize the driver private data */ |
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psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL); |
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if (!psc_dma) { |
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ret = -ENOMEM; |
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goto out_unmap; |
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} |
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/* Get the PSC ID */ |
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prop = of_get_property(op->dev.of_node, "cell-index", &size); |
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if (!prop || size < sizeof *prop) { |
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ret = -ENODEV; |
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goto out_free; |
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} |
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spin_lock_init(&psc_dma->lock); |
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mutex_init(&psc_dma->mutex); |
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psc_dma->id = be32_to_cpu(*prop); |
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psc_dma->irq = irq; |
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psc_dma->psc_regs = regs; |
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psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs; |
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psc_dma->dev = &op->dev; |
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psc_dma->playback.psc_dma = psc_dma; |
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psc_dma->capture.psc_dma = psc_dma; |
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snprintf(psc_dma->name, sizeof(psc_dma->name), "PSC%d", psc_dma->id); |
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/* Find the address of the fifo data registers and setup the |
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* DMA tasks */ |
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fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32); |
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psc_dma->capture.bcom_task = |
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bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512); |
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psc_dma->playback.bcom_task = |
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bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo); |
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if (!psc_dma->capture.bcom_task || |
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!psc_dma->playback.bcom_task) { |
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dev_err(&op->dev, "Could not allocate bestcomm tasks\n"); |
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ret = -ENODEV; |
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goto out_free; |
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} |
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/* Disable all interrupts and reset the PSC */ |
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out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); |
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/* reset receiver */ |
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out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX); |
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/* reset transmitter */ |
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out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX); |
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/* reset error */ |
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out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT); |
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/* reset mode */ |
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out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1); |
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/* Set up mode register; |
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* First write: RxRdy (FIFO Alarm) generates rx FIFO irq |
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* Second write: register Normal mode for non loopback |
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*/ |
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out_8(&psc_dma->psc_regs->mode, 0); |
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out_8(&psc_dma->psc_regs->mode, 0); |
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/* Set the TX and RX fifo alarm thresholds */ |
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out_be16(&psc_dma->fifo_regs->rfalarm, 0x100); |
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out_8(&psc_dma->fifo_regs->rfcntl, 0x4); |
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out_be16(&psc_dma->fifo_regs->tfalarm, 0x100); |
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out_8(&psc_dma->fifo_regs->tfcntl, 0x7); |
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/* Lookup the IRQ numbers */ |
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psc_dma->playback.irq = |
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bcom_get_task_irq(psc_dma->playback.bcom_task); |
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psc_dma->capture.irq = |
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bcom_get_task_irq(psc_dma->capture.bcom_task); |
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rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED, |
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"psc-dma-status", psc_dma); |
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rc |= request_irq(psc_dma->capture.irq, &psc_dma_bcom_irq, IRQF_SHARED, |
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"psc-dma-capture", &psc_dma->capture); |
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rc |= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, IRQF_SHARED, |
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"psc-dma-playback", &psc_dma->playback); |
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if (rc) { |
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ret = -ENODEV; |
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goto out_irq; |
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} |
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/* Save what we've done so it can be found again later */ |
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dev_set_drvdata(&op->dev, psc_dma); |
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/* Tell the ASoC OF helpers about it */ |
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return devm_snd_soc_register_component(&op->dev, |
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&mpc5200_audio_dma_component, NULL, 0); |
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out_irq: |
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free_irq(psc_dma->irq, psc_dma); |
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free_irq(psc_dma->capture.irq, &psc_dma->capture); |
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free_irq(psc_dma->playback.irq, &psc_dma->playback); |
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out_free: |
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kfree(psc_dma); |
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out_unmap: |
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iounmap(regs); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create); |
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int mpc5200_audio_dma_destroy(struct platform_device *op) |
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{ |
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struct psc_dma *psc_dma = dev_get_drvdata(&op->dev); |
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dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n"); |
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bcom_gen_bd_rx_release(psc_dma->capture.bcom_task); |
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bcom_gen_bd_tx_release(psc_dma->playback.bcom_task); |
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/* Release irqs */ |
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free_irq(psc_dma->irq, psc_dma); |
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free_irq(psc_dma->capture.irq, &psc_dma->capture); |
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free_irq(psc_dma->playback.irq, &psc_dma->playback); |
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iounmap(psc_dma->psc_regs); |
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kfree(psc_dma); |
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dev_set_drvdata(&op->dev, NULL); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy); |
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MODULE_AUTHOR("Grant Likely <[email protected]>"); |
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MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver"); |
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MODULE_LICENSE("GPL");
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