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[ALSA] ASoC pxa2xx DMA support
This patch adds pxa2xx ASoC DMA audio support. It's based on sound/arm/pxa-pcm.c by Nicolas Pitre with the following differences. o Modified driver structure to use ASoC core PCM callbacks and data structures. o Registration with ASoC core. From: Liam Girdwood <liam.girdwood@wolfsonmicro.com> Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Liam Girdwood
Jaroslav Kysela
parent
102fa9060e
commit
f11a96d5cd
2 changed files with 411 additions and 0 deletions
363
sound/soc/pxa/pxa2xx-pcm.c
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363
sound/soc/pxa/pxa2xx-pcm.c
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@ -0,0 +1,363 @@
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/*
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* linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
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*
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* Author: Nicolas Pitre
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* Created: Nov 30, 2004
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* Copyright: (C) 2004 MontaVista Software, Inc.
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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 <sound/driver.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 <asm/hardware.h>
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#include <asm/arch/pxa-regs.h>
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#include <asm/arch/audio.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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struct pxa2xx_runtime_data {
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int dma_ch;
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struct pxa2xx_pcm_dma_params *params;
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pxa_dma_desc *dma_desc_array;
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dma_addr_t dma_desc_array_phys;
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};
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static 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 *prtd = 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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prtd->params->name, dma_ch, dcsr );
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}
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}
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static 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 *prtd = runtime->private_data;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct pxa2xx_pcm_dma_params *dma = rtd->cpu_dai->dma_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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int ret;
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/* this may get called several times by oss emulation
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* with different params */
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if (prtd->params == NULL) {
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prtd->params = dma;
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ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
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pxa2xx_pcm_dma_irq, substream);
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if (ret < 0)
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return ret;
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prtd->dma_ch = ret;
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} else if (prtd->params != dma) {
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pxa_free_dma(prtd->dma_ch);
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prtd->params = dma;
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ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
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pxa2xx_pcm_dma_irq, substream);
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if (ret < 0)
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return ret;
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prtd->dma_ch = ret;
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}
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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 = prtd->dma_desc_array;
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next_desc_phys = prtd->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 = prtd->params->dev_addr;
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} else {
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dma_desc->dsadr = prtd->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 = prtd->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 = prtd->dma_desc_array_phys;
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return 0;
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}
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static int pxa2xx_pcm_hw_free(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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*prtd->params->drcmr = 0;
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if (prtd->dma_ch) {
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snd_pcm_set_runtime_buffer(substream, NULL);
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pxa_free_dma(prtd->dma_ch);
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prtd->dma_ch = 0;
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}
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return 0;
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}
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static 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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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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static 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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static 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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static 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 *prtd;
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int ret;
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snd_soc_set_runtime_hwparams(substream, &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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prtd = kzalloc(sizeof(struct pxa2xx_runtime_data), GFP_KERNEL);
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if (prtd == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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prtd->dma_desc_array =
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dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
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&prtd->dma_desc_array_phys, GFP_KERNEL);
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if (!prtd->dma_desc_array) {
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ret = -ENOMEM;
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goto err1;
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}
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runtime->private_data = prtd;
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return 0;
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err1:
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kfree(prtd);
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out:
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return ret;
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}
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static 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 *prtd = runtime->private_data;
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dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
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prtd->dma_desc_array, prtd->dma_desc_array_phys);
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kfree(prtd);
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return 0;
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}
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static 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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struct snd_pcm_ops pxa2xx_pcm_ops = {
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.open = pxa2xx_pcm_open,
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.close = pxa2xx_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = pxa2xx_pcm_hw_params,
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.hw_free = pxa2xx_pcm_hw_free,
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.prepare = pxa2xx_pcm_prepare,
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.trigger = pxa2xx_pcm_trigger,
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.pointer = pxa2xx_pcm_pointer,
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.mmap = pxa2xx_pcm_mmap,
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};
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static 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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static 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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static u64 pxa2xx_pcm_dmamask = DMA_32BIT_MASK;
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int pxa2xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai,
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struct snd_pcm *pcm)
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{
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int ret = 0;
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &pxa2xx_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 (dai->playback.channels_min) {
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ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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goto out;
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}
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if (dai->capture.channels_min) {
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ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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goto out;
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}
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out:
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return ret;
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}
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struct snd_soc_platform pxa2xx_soc_platform = {
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.name = "pxa2xx-audio",
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.pcm_ops = &pxa2xx_pcm_ops,
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.pcm_new = pxa2xx_pcm_new,
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.pcm_free = pxa2xx_pcm_free_dma_buffers,
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};
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EXPORT_SYMBOL_GPL(pxa2xx_soc_platform);
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MODULE_AUTHOR("Nicolas Pitre");
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MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
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MODULE_LICENSE("GPL");
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48
sound/soc/pxa/pxa2xx-pcm.h
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48
sound/soc/pxa/pxa2xx-pcm.h
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@ -0,0 +1,48 @@
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/*
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* linux/sound/arm/pxa2xx-pcm.h -- ALSA PCM interface for the Intel PXA2xx chip
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*
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* Author: Nicolas Pitre
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* Created: Nov 30, 2004
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* Copyright: MontaVista Software, Inc.
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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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#ifndef _PXA2XX_PCM_H
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#define _PXA2XX_PCM_H
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struct pxa2xx_pcm_dma_params {
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char *name; /* stream identifier */
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u32 dcmd; /* DMA descriptor dcmd field */
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volatile u32 *drcmr; /* the DMA request channel to use */
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u32 dev_addr; /* device physical address for DMA */
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};
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struct pxa2xx_gpio {
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u32 sys;
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u32 rx;
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u32 tx;
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u32 clk;
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u32 frm;
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};
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/* pxa2xx DAI ID's */
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#define PXA2XX_DAI_AC97_HIFI 0
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#define PXA2XX_DAI_AC97_AUX 1
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#define PXA2XX_DAI_AC97_MIC 2
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#define PXA2XX_DAI_I2S 0
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#define PXA2XX_DAI_SSP1 0
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#define PXA2XX_DAI_SSP2 1
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#define PXA2XX_DAI_SSP3 2
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extern struct snd_soc_cpu_dai pxa_ac97_dai[3];
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extern struct snd_soc_cpu_dai pxa_i2s_dai;
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extern struct snd_soc_cpu_dai pxa_ssp_dai[3];
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/* platform data */
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extern struct snd_soc_platform pxa2xx_soc_platform;
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extern struct snd_ac97_bus_ops pxa2xx_ac97_ops;
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#endif
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