513 lines
14 KiB
C
513 lines
14 KiB
C
/*
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* atmel-pcm.c -- ALSA PCM interface for the Atmel atmel SoC.
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*
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* Copyright (C) 2005 SAN People
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* Copyright (C) 2008 Atmel
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*
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* Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
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*
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* Based on at91-pcm. by:
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* Frank Mandarino <fmandarino@endrelia.com>
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* Copyright 2006 Endrelia Technologies Inc.
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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 <linux/atmel_pdc.h>
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#include <linux/atmel-ssc.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 "atmel-pcm.h"
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/*--------------------------------------------------------------------------*\
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* Hardware definition
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\*--------------------------------------------------------------------------*/
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/* TODO: These values were taken from the AT91 platform driver, check
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* them against real values for AT32
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*/
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static const struct snd_pcm_hardware atmel_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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/*--------------------------------------------------------------------------*\
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* Data types
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\*--------------------------------------------------------------------------*/
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struct atmel_runtime_data {
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struct atmel_pcm_dma_params *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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/* PDC register save */
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u32 pdc_xpr_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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/*--------------------------------------------------------------------------*\
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* Helper functions
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\*--------------------------------------------------------------------------*/
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static int atmel_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 = atmel_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_coherent(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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pr_debug("atmel-pcm:"
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"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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/*--------------------------------------------------------------------------*\
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* ISR
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\*--------------------------------------------------------------------------*/
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static void atmel_pcm_dma_irq(u32 ssc_sr,
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struct snd_pcm_substream *substream)
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{
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struct atmel_runtime_data *prtd = substream->runtime->private_data;
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struct atmel_pcm_dma_params *params = prtd->params;
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static int count;
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count++;
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if (ssc_sr & params->mask->ssc_endbuf) {
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pr_warning("atmel-pcm: buffer %s on %s"
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" (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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ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
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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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ssc_writex(params->ssc->regs, params->pdc->xpr,
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prtd->period_ptr);
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ssc_writex(params->ssc->regs, params->pdc->xcr,
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prtd->period_size / params->pdc_xfer_size);
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ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
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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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ssc_writex(params->ssc->regs, params->pdc->xnpr,
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prtd->period_ptr);
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ssc_writex(params->ssc->regs, 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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/*--------------------------------------------------------------------------*\
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* PCM operations
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\*--------------------------------------------------------------------------*/
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static int atmel_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 atmel_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 = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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prtd->params->dma_intr_handler = atmel_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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pr_debug("atmel-pcm: "
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"hw_params: DMA for %s initialized "
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"(dma_bytes=%u, period_size=%u)\n",
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prtd->params->name,
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runtime->dma_bytes,
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prtd->period_size);
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return 0;
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}
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static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct atmel_runtime_data *prtd = substream->runtime->private_data;
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struct atmel_pcm_dma_params *params = prtd->params;
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if (params != NULL) {
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ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
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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 atmel_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct atmel_runtime_data *prtd = substream->runtime->private_data;
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struct atmel_pcm_dma_params *params = prtd->params;
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ssc_writex(params->ssc->regs, SSC_IDR,
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params->mask->ssc_endx | params->mask->ssc_endbuf);
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ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
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params->mask->pdc_disable);
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return 0;
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}
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static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
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int cmd)
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{
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struct snd_pcm_runtime *rtd = substream->runtime;
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struct atmel_runtime_data *prtd = rtd->private_data;
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struct atmel_pcm_dma_params *params = prtd->params;
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int ret = 0;
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pr_debug("atmel-pcm:buffer_size = %ld,"
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"dma_area = %p, dma_bytes = %u\n",
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rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
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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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ssc_writex(params->ssc->regs, params->pdc->xpr,
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prtd->period_ptr);
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ssc_writex(params->ssc->regs, 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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ssc_writex(params->ssc->regs, params->pdc->xnpr,
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prtd->period_ptr);
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ssc_writex(params->ssc->regs, params->pdc->xncr,
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prtd->period_size / params->pdc_xfer_size);
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pr_debug("atmel-pcm: trigger: "
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"period_ptr=%lx, xpr=%u, "
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"xcr=%u, xnpr=%u, xncr=%u\n",
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(unsigned long)prtd->period_ptr,
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ssc_readx(params->ssc->regs, params->pdc->xpr),
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ssc_readx(params->ssc->regs, params->pdc->xcr),
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ssc_readx(params->ssc->regs, params->pdc->xnpr),
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ssc_readx(params->ssc->regs, params->pdc->xncr));
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ssc_writex(params->ssc->regs, SSC_IER,
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params->mask->ssc_endx | params->mask->ssc_endbuf);
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ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
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params->mask->pdc_enable);
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pr_debug("sr=%u imr=%u\n",
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ssc_readx(params->ssc->regs, SSC_SR),
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ssc_readx(params->ssc->regs, SSC_IER));
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break; /* SNDRV_PCM_TRIGGER_START */
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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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ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
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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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ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
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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 atmel_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 atmel_runtime_data *prtd = runtime->private_data;
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struct atmel_pcm_dma_params *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) ssc_readx(params->ssc->regs, 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 atmel_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 atmel_runtime_data *prtd;
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int ret = 0;
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snd_soc_set_runtime_hwparams(substream, &atmel_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,
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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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prtd = kzalloc(sizeof(struct atmel_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 atmel_pcm_close(struct snd_pcm_substream *substream)
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{
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struct atmel_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 atmel_pcm_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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return remap_pfn_range(vma, vma->vm_start,
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substream->dma_buffer.addr >> PAGE_SHIFT,
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vma->vm_end - vma->vm_start, vma->vm_page_prot);
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}
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static struct snd_pcm_ops atmel_pcm_ops = {
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.open = atmel_pcm_open,
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.close = atmel_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = atmel_pcm_hw_params,
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.hw_free = atmel_pcm_hw_free,
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.prepare = atmel_pcm_prepare,
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.trigger = atmel_pcm_trigger,
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.pointer = atmel_pcm_pointer,
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.mmap = atmel_pcm_mmap,
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};
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/*--------------------------------------------------------------------------*\
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* ASoC platform driver
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\*--------------------------------------------------------------------------*/
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static u64 atmel_pcm_dmamask = 0xffffffff;
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static int atmel_pcm_new(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 = rtd->cpu_dai;
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struct snd_pcm *pcm = rtd->pcm;
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int ret = 0;
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &atmel_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->driver->playback.channels_min) {
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ret = atmel_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->driver->capture.channels_min) {
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pr_debug("atmel-pcm:"
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"Allocating PCM capture DMA buffer\n");
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ret = atmel_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 atmel_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_coherent(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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#ifdef CONFIG_PM
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static int atmel_pcm_suspend(struct snd_soc_dai *dai)
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{
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struct snd_pcm_runtime *runtime = dai->runtime;
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struct atmel_runtime_data *prtd;
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struct atmel_pcm_dma_params *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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ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable);
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prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr);
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prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr);
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prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr);
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prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr);
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return 0;
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}
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static int atmel_pcm_resume(struct snd_soc_dai *dai)
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{
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struct snd_pcm_runtime *runtime = dai->runtime;
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struct atmel_runtime_data *prtd;
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struct atmel_pcm_dma_params *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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ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
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ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
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ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
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ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);
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ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable);
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return 0;
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}
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#else
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#define atmel_pcm_suspend NULL
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#define atmel_pcm_resume NULL
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#endif
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static struct snd_soc_platform_driver atmel_soc_platform = {
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.ops = &atmel_pcm_ops,
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.pcm_new = atmel_pcm_new,
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.pcm_free = atmel_pcm_free_dma_buffers,
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.suspend = atmel_pcm_suspend,
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.resume = atmel_pcm_resume,
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};
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static int __devinit atmel_soc_platform_probe(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev, &atmel_soc_platform);
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}
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static int __devexit atmel_soc_platform_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_platform(&pdev->dev);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver atmel_pcm_driver = {
|
|
.driver = {
|
|
.name = "atmel-pcm-audio",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
|
|
.probe = atmel_soc_platform_probe,
|
|
.remove = __devexit_p(atmel_soc_platform_remove),
|
|
};
|
|
|
|
static int __init snd_atmel_pcm_init(void)
|
|
{
|
|
return platform_driver_register(&atmel_pcm_driver);
|
|
}
|
|
module_init(snd_atmel_pcm_init);
|
|
|
|
static void __exit snd_atmel_pcm_exit(void)
|
|
{
|
|
platform_driver_unregister(&atmel_pcm_driver);
|
|
}
|
|
module_exit(snd_atmel_pcm_exit);
|
|
|
|
MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
|
|
MODULE_DESCRIPTION("Atmel PCM module");
|
|
MODULE_LICENSE("GPL");
|