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![Mark Brown](/assets/img/avatar_default.png)
Used for applications such as direct bluetooth connections on smartphones which don't go via the CPU. This used to be supported before the refactoring to share code but this check was removed during that move. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
280 lines
7.2 KiB
C
280 lines
7.2 KiB
C
/*
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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/dma-mapping.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/pxa2xx-lib.h>
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#include <mach/dma.h>
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#include "pxa2xx-pcm.h"
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static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S24_LE |
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SNDRV_PCM_FMTBIT_S32_LE,
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.period_bytes_min = 32,
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.period_bytes_max = 8192 - 32,
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.periods_min = 1,
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.periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
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.buffer_bytes_max = 128 * 1024,
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.fifo_size = 32,
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};
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int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct pxa2xx_runtime_data *rtd = runtime->private_data;
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size_t totsize = params_buffer_bytes(params);
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size_t period = params_period_bytes(params);
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pxa_dma_desc *dma_desc;
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dma_addr_t dma_buff_phys, next_desc_phys;
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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runtime->dma_bytes = totsize;
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dma_desc = rtd->dma_desc_array;
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next_desc_phys = rtd->dma_desc_array_phys;
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dma_buff_phys = runtime->dma_addr;
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do {
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next_desc_phys += sizeof(pxa_dma_desc);
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dma_desc->ddadr = next_desc_phys;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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dma_desc->dsadr = dma_buff_phys;
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dma_desc->dtadr = rtd->params->dev_addr;
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} else {
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dma_desc->dsadr = rtd->params->dev_addr;
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dma_desc->dtadr = dma_buff_phys;
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}
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if (period > totsize)
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period = totsize;
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dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN;
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dma_desc++;
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dma_buff_phys += period;
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} while (totsize -= period);
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dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
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return 0;
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}
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EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
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int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
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if (rtd && rtd->params && rtd->params->drcmr)
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*rtd->params->drcmr = 0;
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snd_pcm_set_runtime_buffer(substream, NULL);
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return 0;
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}
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EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
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int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
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int ret = 0;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
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DCSR(prtd->dma_ch) = DCSR_RUN;
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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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DCSR(prtd->dma_ch) &= ~DCSR_RUN;
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break;
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case SNDRV_PCM_TRIGGER_RESUME:
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DCSR(prtd->dma_ch) |= DCSR_RUN;
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break;
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
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DCSR(prtd->dma_ch) |= DCSR_RUN;
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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EXPORT_SYMBOL(pxa2xx_pcm_trigger);
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snd_pcm_uframes_t
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pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct pxa2xx_runtime_data *prtd = runtime->private_data;
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dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
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DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
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snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
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if (x == runtime->buffer_size)
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x = 0;
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return x;
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}
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EXPORT_SYMBOL(pxa2xx_pcm_pointer);
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int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
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if (!prtd || !prtd->params)
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return 0;
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DCSR(prtd->dma_ch) &= ~DCSR_RUN;
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DCSR(prtd->dma_ch) = 0;
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DCMD(prtd->dma_ch) = 0;
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*prtd->params->drcmr = prtd->dma_ch | DRCMR_MAPVLD;
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return 0;
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}
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EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
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void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
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{
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struct snd_pcm_substream *substream = dev_id;
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struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
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int dcsr;
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dcsr = DCSR(dma_ch);
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DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
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if (dcsr & DCSR_ENDINTR) {
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snd_pcm_period_elapsed(substream);
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} else {
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printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
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rtd->params->name, dma_ch, dcsr);
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snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
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}
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}
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EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
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int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct pxa2xx_runtime_data *rtd;
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int ret;
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runtime->hw = pxa2xx_pcm_hardware;
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/*
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* For mysterious reasons (and despite what the manual says)
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* playback samples are lost if the DMA count is not a multiple
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* of the DMA burst size. Let's add a rule to enforce that.
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*/
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ret = snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
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if (ret)
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goto out;
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ret = snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
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if (ret)
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goto out;
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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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goto out;
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ret = -ENOMEM;
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rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
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if (!rtd)
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goto out;
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rtd->dma_desc_array =
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dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
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&rtd->dma_desc_array_phys, GFP_KERNEL);
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if (!rtd->dma_desc_array)
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goto err1;
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runtime->private_data = rtd;
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return 0;
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err1:
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kfree(rtd);
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out:
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return ret;
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}
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EXPORT_SYMBOL(__pxa2xx_pcm_open);
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int __pxa2xx_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 pxa2xx_runtime_data *rtd = runtime->private_data;
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dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
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rtd->dma_desc_array, rtd->dma_desc_array_phys);
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kfree(rtd);
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return 0;
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}
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EXPORT_SYMBOL(__pxa2xx_pcm_close);
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int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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return dma_mmap_writecombine(substream->pcm->card->dev, vma,
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runtime->dma_area,
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runtime->dma_addr,
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runtime->dma_bytes);
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}
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EXPORT_SYMBOL(pxa2xx_pcm_mmap);
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int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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{
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
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buf->dev.type = SNDRV_DMA_TYPE_DEV;
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buf->dev.dev = pcm->card->dev;
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buf->private_data = NULL;
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buf->area = dma_alloc_writecombine(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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if (!buf->area)
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return -ENOMEM;
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buf->bytes = size;
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return 0;
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}
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EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
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void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *substream;
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struct snd_dma_buffer *buf;
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int stream;
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for (stream = 0; stream < 2; stream++) {
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substream = pcm->streams[stream].substream;
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if (!substream)
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continue;
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buf = &substream->dma_buffer;
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if (!buf->area)
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continue;
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dma_free_writecombine(pcm->card->dev, buf->bytes,
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buf->area, buf->addr);
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buf->area = NULL;
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}
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}
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EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
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MODULE_AUTHOR("Nicolas Pitre");
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MODULE_DESCRIPTION("Intel PXA2xx sound library");
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MODULE_LICENSE("GPL");
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