[ALSA] ASoC AT91RM92000 audio DMA
This patch adds ASoC audio DMA support to the Atmel AT91RM9200 CPU. Features:- o Playback/Capture supported. o 16 Bit data size. Signed-off-by: Frank Mandarino <fmandarino@endrelia.com> 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:
Frank Mandarino
Jaroslav Kysela
parent
7f137ab673
commit
ff9abf5b0a
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@ -0,0 +1,428 @@
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/*
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* at91rm9200-pcm.c -- ALSA PCM interface for the Atmel AT91RM9200 chip.
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*
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* Author: Frank Mandarino <fmandarino@endrelia.com>
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* Endrelia Technologies Inc.
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* Created: Mar 3, 2006
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*
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* Based on pxa2xx-pcm.c by:
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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/arch/at91rm9200.h>
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#include <asm/arch/at91rm9200_ssc.h>
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#include <asm/arch/at91rm9200_pdc.h>
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#include <asm/arch/hardware.h>
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#include "at91rm9200-pcm.h"
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#if 0
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#define DBG(x...) printk(KERN_INFO "at91rm9200-pcm: " x)
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#else
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#define DBG(x...)
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#endif
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static const snd_pcm_hardware_t at91rm9200_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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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.period_bytes_min = 32,
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.period_bytes_max = 8192,
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.periods_min = 2,
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.periods_max = 1024,
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.buffer_bytes_max = 32 * 1024,
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};
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struct at91rm9200_runtime_data {
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at91rm9200_pcm_dma_params_t *params;
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dma_addr_t dma_buffer; /* physical address of dma buffer */
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dma_addr_t dma_buffer_end; /* first address beyond DMA buffer */
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size_t period_size;
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dma_addr_t period_ptr; /* physical address of next period */
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u32 pdc_xpr_save; /* PDC register save */
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u32 pdc_xcr_save;
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u32 pdc_xnpr_save;
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u32 pdc_xncr_save;
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};
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static void at91rm9200_pcm_dma_irq(u32 ssc_sr,
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struct snd_pcm_substream *substream)
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{
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struct at91rm9200_runtime_data *prtd = substream->runtime->private_data;
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at91rm9200_pcm_dma_params_t *params = prtd->params;
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static int count = 0;
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count++;
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if (ssc_sr & params->mask->ssc_endbuf) {
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printk(KERN_WARNING
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"at91rm9200-pcm: buffer %s on %s (SSC_SR=%#x, count=%d)\n",
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substream->stream == SNDRV_PCM_STREAM_PLAYBACK
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? "underrun" : "overrun",
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params->name, ssc_sr, count);
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/* re-start the PDC */
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at91_ssc_write(params->pdc->ptcr, params->mask->pdc_disable);
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prtd->period_ptr += prtd->period_size;
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if (prtd->period_ptr >= prtd->dma_buffer_end) {
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prtd->period_ptr = prtd->dma_buffer;
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}
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at91_ssc_write(params->pdc->xpr, prtd->period_ptr);
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at91_ssc_write(params->pdc->xcr,
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prtd->period_size / params->pdc_xfer_size);
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at91_ssc_write(params->pdc->ptcr, params->mask->pdc_enable);
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}
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if (ssc_sr & params->mask->ssc_endx) {
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/* Load the PDC next pointer and counter registers */
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prtd->period_ptr += prtd->period_size;
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if (prtd->period_ptr >= prtd->dma_buffer_end) {
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prtd->period_ptr = prtd->dma_buffer;
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}
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at91_ssc_write(params->pdc->xnpr, prtd->period_ptr);
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at91_ssc_write(params->pdc->xncr,
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prtd->period_size / params->pdc_xfer_size);
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}
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snd_pcm_period_elapsed(substream);
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}
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static int at91rm9200_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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snd_pcm_runtime_t *runtime = substream->runtime;
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struct at91rm9200_runtime_data *prtd = runtime->private_data;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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/* this may get called several times by oss emulation
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* with different params */
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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runtime->dma_bytes = params_buffer_bytes(params);
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prtd->params = rtd->cpu_dai->dma_data;
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prtd->params->dma_intr_handler = at91rm9200_pcm_dma_irq;
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prtd->dma_buffer = runtime->dma_addr;
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prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
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prtd->period_size = params_period_bytes(params);
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DBG("hw_params: DMA for %s initialized (dma_bytes=%d, period_size=%d)\n",
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prtd->params->name, runtime->dma_bytes, prtd->period_size);
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return 0;
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}
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static int at91rm9200_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct at91rm9200_runtime_data *prtd = substream->runtime->private_data;
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at91rm9200_pcm_dma_params_t *params = prtd->params;
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if (params != NULL) {
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at91_ssc_write(params->pdc->ptcr, params->mask->pdc_disable);
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prtd->params->dma_intr_handler = NULL;
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}
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return 0;
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}
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static int at91rm9200_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct at91rm9200_runtime_data *prtd = substream->runtime->private_data;
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at91rm9200_pcm_dma_params_t *params = prtd->params;
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at91_ssc_write(params->ssc->idr,
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params->mask->ssc_endx | params->mask->ssc_endbuf);
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at91_ssc_write(params->pdc->ptcr, params->mask->pdc_disable);
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return 0;
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}
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static int at91rm9200_pcm_trigger(struct snd_pcm_substream *substream,
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int cmd)
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{
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struct at91rm9200_runtime_data *prtd = substream->runtime->private_data;
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at91rm9200_pcm_dma_params_t *params = prtd->params;
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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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prtd->period_ptr = prtd->dma_buffer;
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at91_ssc_write(params->pdc->xpr, prtd->period_ptr);
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at91_ssc_write(params->pdc->xcr,
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prtd->period_size / params->pdc_xfer_size);
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prtd->period_ptr += prtd->period_size;
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at91_ssc_write(params->pdc->xnpr, prtd->period_ptr);
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at91_ssc_write(params->pdc->xncr,
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prtd->period_size / params->pdc_xfer_size);
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DBG("trigger: period_ptr=%lx, xpr=%lx, xcr=%ld, xnpr=%lx, xncr=%ld\n",
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(unsigned long) prtd->period_ptr,
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at91_ssc_read(params->pdc->xpr),
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at91_ssc_read(params->pdc->xcr),
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at91_ssc_read(params->pdc->xnpr),
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at91_ssc_read(params->pdc->xncr));
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at91_ssc_write(params->ssc->ier,
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params->mask->ssc_endx | params->mask->ssc_endbuf);
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at91_ssc_write(params->pdc->ptcr, params->mask->pdc_enable);
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DBG("sr=%lx imr=%lx\n", at91_ssc_read(params->ssc->ier - 4),
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at91_ssc_read(params->ssc->ier + 8));
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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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at91_ssc_write(params->pdc->ptcr, params->mask->pdc_disable);
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break;
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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at91_ssc_write(params->pdc->ptcr, params->mask->pdc_enable);
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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 at91rm9200_pcm_pointer(
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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 at91rm9200_runtime_data *prtd = runtime->private_data;
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at91rm9200_pcm_dma_params_t *params = prtd->params;
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dma_addr_t ptr;
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snd_pcm_uframes_t x;
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ptr = (dma_addr_t) at91_ssc_read(params->pdc->xpr);
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x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
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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 at91rm9200_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 at91rm9200_runtime_data *prtd;
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int ret = 0;
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snd_soc_set_runtime_hwparams(substream, &at91rm9200_pcm_hardware);
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/* ensure that buffer size is a multiple of period size */
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ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
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if (ret < 0)
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goto out;
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prtd = kzalloc(sizeof(struct at91rm9200_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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runtime->private_data = prtd;
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out:
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return ret;
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}
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static int at91rm9200_pcm_close(struct snd_pcm_substream *substream)
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{
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struct at91rm9200_runtime_data *prtd = substream->runtime->private_data;
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kfree(prtd);
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return 0;
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}
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static int at91rm9200_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 at91rm9200_pcm_ops = {
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.open = at91rm9200_pcm_open,
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.close = at91rm9200_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = at91rm9200_pcm_hw_params,
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.hw_free = at91rm9200_pcm_hw_free,
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.prepare = at91rm9200_pcm_prepare,
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.trigger = at91rm9200_pcm_trigger,
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.pointer = at91rm9200_pcm_pointer,
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.mmap = at91rm9200_pcm_mmap,
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};
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static int at91rm9200_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
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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 = at91rm9200_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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DBG("preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
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(void *) buf->area,
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(void *) buf->addr,
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size);
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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 u64 at91rm9200_pcm_dmamask = 0xffffffff;
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static int at91rm9200_pcm_new(struct snd_card *card,
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struct snd_soc_codec_dai *dai, 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 = &at91rm9200_pcm_dmamask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = 0xffffffff;
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if (dai->playback.channels_min) {
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ret = at91rm9200_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 = at91rm9200_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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static void at91rm9200_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 int at91rm9200_pcm_suspend(struct platform_device *pdev,
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struct snd_soc_cpu_dai *dai)
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{
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struct snd_pcm_runtime *runtime = dai->runtime;
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struct at91rm9200_runtime_data *prtd;
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at91rm9200_pcm_dma_params_t *params;
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if (!runtime)
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return 0;
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prtd = runtime->private_data;
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params = prtd->params;
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/* disable the PDC and save the PDC registers */
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at91_ssc_write(params->pdc->ptcr, params->mask->pdc_disable);
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prtd->pdc_xpr_save = at91_ssc_read(params->pdc->xpr);
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prtd->pdc_xcr_save = at91_ssc_read(params->pdc->xcr);
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prtd->pdc_xnpr_save = at91_ssc_read(params->pdc->xnpr);
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prtd->pdc_xncr_save = at91_ssc_read(params->pdc->xncr);
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return 0;
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}
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static int at91rm9200_pcm_resume(struct platform_device *pdev,
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struct snd_soc_cpu_dai *dai)
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{
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struct snd_pcm_runtime *runtime = dai->runtime;
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struct at91rm9200_runtime_data *prtd;
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at91rm9200_pcm_dma_params_t *params;
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if (!runtime)
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return 0;
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prtd = runtime->private_data;
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params = prtd->params;
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/* restore the PDC registers and enable the PDC */
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at91_ssc_write(params->pdc->xpr, prtd->pdc_xpr_save);
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at91_ssc_write(params->pdc->xcr, prtd->pdc_xcr_save);
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at91_ssc_write(params->pdc->xnpr, prtd->pdc_xnpr_save);
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at91_ssc_write(params->pdc->xncr, prtd->pdc_xncr_save);
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at91_ssc_write(params->pdc->ptcr, params->mask->pdc_enable);
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return 0;
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}
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struct snd_soc_platform at91rm9200_soc_platform = {
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.name = "at91rm9200-audio",
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.pcm_ops = &at91rm9200_pcm_ops,
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.pcm_new = at91rm9200_pcm_new,
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.pcm_free = at91rm9200_pcm_free_dma_buffers,
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.suspend = at91rm9200_pcm_suspend,
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.resume = at91rm9200_pcm_resume,
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};
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EXPORT_SYMBOL_GPL(at91rm9200_soc_platform);
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MODULE_AUTHOR("Frank Mandarino <fmandarino@endrelia.com>");
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MODULE_DESCRIPTION("Atmel AT91RM9200 PCM module");
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MODULE_LICENSE("GPL");
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|
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@ -0,0 +1,75 @@
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/*
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* at91rm9200-pcm.h - ALSA PCM interface for the Atmel AT91RM9200 chip
|
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*
|
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* Author: Frank Mandarino <fmandarino@endrelia.com>
|
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* Endrelia Technologies Inc.
|
||||
* Created: Mar 3, 2006
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*
|
||||
* Based on pxa2xx-pcm.h by:
|
||||
*
|
||||
* Author: Nicolas Pitre
|
||||
* Created: Nov 30, 2004
|
||||
* Copyright: MontaVista Software, Inc.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Registers and status bits that are required by the PCM driver.
|
||||
*/
|
||||
struct at91rm9200_ssc_regs {
|
||||
void __iomem *cr; /* SSC control */
|
||||
void __iomem *ier; /* SSC interrupt enable */
|
||||
void __iomem *idr; /* SSC interrupt disable */
|
||||
};
|
||||
|
||||
struct at91rm9200_pdc_regs {
|
||||
void __iomem *xpr; /* PDC recv/trans pointer */
|
||||
void __iomem *xcr; /* PDC recv/trans counter */
|
||||
void __iomem *xnpr; /* PDC next recv/trans pointer */
|
||||
void __iomem *xncr; /* PDC next recv/trans counter */
|
||||
void __iomem *ptcr; /* PDC transfer control */
|
||||
};
|
||||
|
||||
struct at91rm9200_ssc_mask {
|
||||
u32 ssc_enable; /* SSC recv/trans enable */
|
||||
u32 ssc_disable; /* SSC recv/trans disable */
|
||||
u32 ssc_endx; /* SSC ENDTX or ENDRX */
|
||||
u32 ssc_endbuf; /* SSC TXBUFE or RXBUFF */
|
||||
u32 pdc_enable; /* PDC recv/trans enable */
|
||||
u32 pdc_disable; /* PDC recv/trans disable */
|
||||
};
|
||||
|
||||
|
||||
/*
|
||||
* This structure, shared between the PCM driver and the interface,
|
||||
* contains all information required by the PCM driver to perform the
|
||||
* PDC DMA operation. All fields except dma_intr_handler() are initialized
|
||||
* by the interface. The dms_intr_handler() pointer is set by the PCM
|
||||
* driver and called by the interface SSC interrupt handler if it is
|
||||
* non-NULL.
|
||||
*/
|
||||
typedef struct {
|
||||
char *name; /* stream identifier */
|
||||
int pdc_xfer_size; /* PDC counter increment in bytes */
|
||||
struct at91rm9200_ssc_regs *ssc; /* SSC register addresses */
|
||||
struct at91rm9200_pdc_regs *pdc; /* PDC receive/transmit registers */
|
||||
struct at91rm9200_ssc_mask *mask;/* SSC & PDC status bits */
|
||||
snd_pcm_substream_t *substream;
|
||||
void (*dma_intr_handler)(u32, snd_pcm_substream_t *);
|
||||
} at91rm9200_pcm_dma_params_t;
|
||||
|
||||
extern struct snd_soc_cpu_dai at91rm9200_i2s_dai[3];
|
||||
extern struct snd_soc_platform at91rm9200_soc_platform;
|
||||
|
||||
|
||||
/*
|
||||
* SSC I/O helpers.
|
||||
* E.g., at91_ssc_write(AT91_SSC(1) + AT91_SSC_CR, AT91_SSC_RXEN);
|
||||
*/
|
||||
#define AT91_SSC(x) (((x)==0) ? AT91_VA_BASE_SSC0 :\
|
||||
((x)==1) ? AT91_VA_BASE_SSC1 : ((x)==2) ? AT91_VA_BASE_SSC2 : NULL)
|
||||
#define at91_ssc_read(a) ((unsigned long) __raw_readl(a))
|
||||
#define at91_ssc_write(a,v) __raw_writel((v),(a))
|
||||
Reference in New Issue