2007-02-14 12:20:03 +00:00
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/*
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* s3c24xx-pcm.c -- ALSA Soc Audio Layer
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*
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* (c) 2006 Wolfson Microelectronics PLC.
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* Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
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*
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2009-02-28 17:09:57 +00:00
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* Copyright 2004-2005 Simtec Electronics
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2007-02-14 12:20:03 +00:00
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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2008-04-30 15:19:32 +00:00
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#include <linux/io.h>
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2007-02-14 12:20:03 +00:00
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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/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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2008-08-05 15:14:15 +00:00
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#include <mach/hardware.h>
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#include <mach/dma.h>
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2007-02-14 12:20:03 +00:00
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#include "s3c24xx-pcm.h"
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static const struct snd_pcm_hardware s3c24xx_pcm_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP |
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2008-01-10 13:44:24 +00:00
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME,
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2007-02-14 12:20:03 +00:00
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_U16_LE |
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SNDRV_PCM_FMTBIT_U8 |
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SNDRV_PCM_FMTBIT_S8,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = 128*1024,
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.period_bytes_min = PAGE_SIZE,
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.period_bytes_max = PAGE_SIZE*2,
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.periods_min = 2,
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.periods_max = 128,
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.fifo_size = 32,
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};
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struct s3c24xx_runtime_data {
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spinlock_t lock;
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int state;
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unsigned int dma_loaded;
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unsigned int dma_limit;
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unsigned int dma_period;
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dma_addr_t dma_start;
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dma_addr_t dma_pos;
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dma_addr_t dma_end;
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struct s3c24xx_pcm_dma_params *params;
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};
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/* s3c24xx_pcm_enqueue
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*
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* place a dma buffer onto the queue for the dma system
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* to handle.
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*/
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2008-11-14 14:40:46 +00:00
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static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream)
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2007-02-14 12:20:03 +00:00
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{
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struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
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dma_addr_t pos = prtd->dma_pos;
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2009-09-22 15:48:56 +00:00
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unsigned int limit;
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2007-02-14 12:20:03 +00:00
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int ret;
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2009-03-06 18:04:34 +00:00
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pr_debug("Entered %s\n", __func__);
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2007-02-14 12:20:03 +00:00
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2009-09-22 15:48:56 +00:00
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if (s3c_dma_has_circular()) {
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limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
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} else
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limit = prtd->dma_limit;
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pr_debug("%s: loaded %d, limit %d\n", __func__, prtd->dma_loaded, limit);
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while (prtd->dma_loaded < limit) {
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2007-02-14 12:20:03 +00:00
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unsigned long len = prtd->dma_period;
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2009-03-06 18:04:34 +00:00
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pr_debug("dma_loaded: %d\n", prtd->dma_loaded);
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2007-02-14 12:20:03 +00:00
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if ((pos + len) > prtd->dma_end) {
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len = prtd->dma_end - pos;
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2009-03-06 18:04:34 +00:00
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pr_debug(KERN_DEBUG "%s: corrected dma len %ld\n",
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2008-03-03 23:32:18 +00:00
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__func__, len);
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2007-02-14 12:20:03 +00:00
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}
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2008-04-30 15:19:32 +00:00
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ret = s3c2410_dma_enqueue(prtd->params->channel,
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2007-04-17 10:35:18 +00:00
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substream, pos, len);
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2007-02-14 12:20:03 +00:00
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if (ret == 0) {
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prtd->dma_loaded++;
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pos += prtd->dma_period;
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if (pos >= prtd->dma_end)
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pos = prtd->dma_start;
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} else
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break;
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}
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prtd->dma_pos = pos;
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}
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static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
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2007-04-17 10:35:18 +00:00
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void *dev_id, int size,
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enum s3c2410_dma_buffresult result)
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2007-02-14 12:20:03 +00:00
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{
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struct snd_pcm_substream *substream = dev_id;
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2007-04-17 10:35:18 +00:00
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struct s3c24xx_runtime_data *prtd;
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2007-02-14 12:20:03 +00:00
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2009-03-06 18:04:34 +00:00
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pr_debug("Entered %s\n", __func__);
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2007-02-14 12:20:03 +00:00
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if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
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return;
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2007-04-17 10:35:18 +00:00
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prtd = substream->runtime->private_data;
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2008-04-30 15:19:32 +00:00
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2007-02-14 12:20:03 +00:00
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if (substream)
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snd_pcm_period_elapsed(substream);
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spin_lock(&prtd->lock);
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2009-09-22 15:48:56 +00:00
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if (prtd->state & ST_RUNNING && !s3c_dma_has_circular()) {
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2007-02-14 12:20:03 +00:00
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prtd->dma_loaded--;
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2008-11-14 14:40:46 +00:00
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s3c24xx_pcm_enqueue(substream);
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2007-02-14 12:20:03 +00:00
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}
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spin_unlock(&prtd->lock);
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}
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static int s3c24xx_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 s3c24xx_runtime_data *prtd = runtime->private_data;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct s3c24xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data;
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unsigned long totbytes = params_buffer_bytes(params);
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2008-04-30 15:19:32 +00:00
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int ret = 0;
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2007-02-14 12:20:03 +00:00
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2009-03-06 18:04:34 +00:00
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pr_debug("Entered %s\n", __func__);
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2007-02-14 12:20:03 +00:00
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/* return if this is a bufferless transfer e.g.
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* codec <--> BT codec or GSM modem -- lg FIXME */
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if (!dma)
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return 0;
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2007-07-24 10:49:39 +00:00
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/* this may get called several times by oss emulation
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* with different params -HW */
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if (prtd->params == NULL) {
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/* prepare DMA */
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prtd->params = dma;
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2007-02-14 12:20:03 +00:00
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2009-03-06 18:04:34 +00:00
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pr_debug("params %p, client %p, channel %d\n", prtd->params,
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2007-07-24 10:49:39 +00:00
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prtd->params->client, prtd->params->channel);
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2007-02-14 12:20:03 +00:00
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2007-07-24 10:49:39 +00:00
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ret = s3c2410_dma_request(prtd->params->channel,
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prtd->params->client, NULL);
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2007-02-14 12:20:03 +00:00
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2008-05-05 12:56:07 +00:00
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if (ret < 0) {
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2009-03-06 18:13:43 +00:00
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printk(KERN_ERR "failed to get dma channel\n");
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2007-07-24 10:49:39 +00:00
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return ret;
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}
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2009-09-22 15:48:56 +00:00
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/* use the circular buffering if we have it available. */
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if (s3c_dma_has_circular())
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s3c2410_dma_setflags(prtd->params->channel,
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S3C2410_DMAF_CIRCULAR);
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2007-02-14 12:20:03 +00:00
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}
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s3c2410_dma_set_buffdone_fn(prtd->params->channel,
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s3c24xx_audio_buffdone);
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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runtime->dma_bytes = totbytes;
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spin_lock_irq(&prtd->lock);
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prtd->dma_loaded = 0;
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prtd->dma_limit = runtime->hw.periods_min;
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prtd->dma_period = params_period_bytes(params);
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prtd->dma_start = runtime->dma_addr;
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prtd->dma_pos = prtd->dma_start;
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prtd->dma_end = prtd->dma_start + totbytes;
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spin_unlock_irq(&prtd->lock);
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return 0;
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}
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static int s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
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2009-03-06 18:04:34 +00:00
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pr_debug("Entered %s\n", __func__);
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2007-02-14 12:20:03 +00:00
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/* TODO - do we need to ensure DMA flushed */
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snd_pcm_set_runtime_buffer(substream, NULL);
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2007-04-17 10:35:18 +00:00
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if (prtd->params) {
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2007-02-14 12:20:03 +00:00
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s3c2410_dma_free(prtd->params->channel, prtd->params->client);
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prtd->params = NULL;
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}
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return 0;
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}
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static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
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int ret = 0;
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2009-03-06 18:04:34 +00:00
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pr_debug("Entered %s\n", __func__);
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2007-02-14 12:20:03 +00:00
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/* return if this is a bufferless transfer e.g.
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* codec <--> BT codec or GSM modem -- lg FIXME */
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if (!prtd->params)
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2008-04-30 15:19:32 +00:00
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return 0;
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2007-02-14 12:20:03 +00:00
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2008-01-10 13:44:24 +00:00
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/* channel needs configuring for mem=>device, increment memory addr,
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* sync to pclk, half-word transfers to the IIS-FIFO. */
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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s3c2410_dma_devconfig(prtd->params->channel,
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2009-03-19 15:02:34 +00:00
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S3C2410_DMASRC_MEM,
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prtd->params->dma_addr);
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2008-01-10 13:44:24 +00:00
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} else {
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s3c2410_dma_devconfig(prtd->params->channel,
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2009-03-19 15:02:34 +00:00
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S3C2410_DMASRC_HW,
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prtd->params->dma_addr);
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2008-01-10 13:44:24 +00:00
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}
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2009-03-19 15:02:34 +00:00
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s3c2410_dma_config(prtd->params->channel,
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prtd->params->dma_size);
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2007-02-14 12:20:03 +00:00
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/* flush the DMA channel */
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s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
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prtd->dma_loaded = 0;
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prtd->dma_pos = prtd->dma_start;
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/* enqueue dma buffers */
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2008-11-14 14:40:46 +00:00
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s3c24xx_pcm_enqueue(substream);
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2007-02-14 12:20:03 +00:00
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return ret;
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}
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static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
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int ret = 0;
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2009-03-06 18:04:34 +00:00
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pr_debug("Entered %s\n", __func__);
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2007-02-14 12:20:03 +00:00
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spin_lock(&prtd->lock);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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prtd->state |= ST_RUNNING;
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s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
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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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prtd->state &= ~ST_RUNNING;
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s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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spin_unlock(&prtd->lock);
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return ret;
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}
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|
2008-04-30 15:19:32 +00:00
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static snd_pcm_uframes_t
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s3c24xx_pcm_pointer(struct snd_pcm_substream *substream)
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2007-02-14 12:20:03 +00:00
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct s3c24xx_runtime_data *prtd = runtime->private_data;
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unsigned long res;
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dma_addr_t src, dst;
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|
2009-03-06 18:04:34 +00:00
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pr_debug("Entered %s\n", __func__);
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2007-02-14 12:20:03 +00:00
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spin_lock(&prtd->lock);
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s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
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res = dst - prtd->dma_start;
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else
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res = src - prtd->dma_start;
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spin_unlock(&prtd->lock);
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|
2009-03-06 18:04:34 +00:00
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pr_debug("Pointer %x %x\n", src, dst);
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2007-02-14 12:20:03 +00:00
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/* we seem to be getting the odd error from the pcm library due
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|
|
|
* to out-of-bounds pointers. this is maybe due to the dma engine
|
|
|
|
* not having loaded the new values for the channel before being
|
|
|
|
* callled... (todo - fix )
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (res >= snd_pcm_lib_buffer_bytes(substream)) {
|
|
|
|
if (res == snd_pcm_lib_buffer_bytes(substream))
|
|
|
|
res = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
return bytes_to_frames(substream->runtime, res);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int s3c24xx_pcm_open(struct snd_pcm_substream *substream)
|
|
|
|
{
|
|
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
struct s3c24xx_runtime_data *prtd;
|
|
|
|
|
2009-03-06 18:04:34 +00:00
|
|
|
pr_debug("Entered %s\n", __func__);
|
2007-02-14 12:20:03 +00:00
|
|
|
|
2009-08-20 15:02:23 +00:00
|
|
|
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
|
2007-02-14 12:20:03 +00:00
|
|
|
snd_soc_set_runtime_hwparams(substream, &s3c24xx_pcm_hardware);
|
|
|
|
|
|
|
|
prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
|
|
|
|
if (prtd == NULL)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2007-05-22 14:17:05 +00:00
|
|
|
spin_lock_init(&prtd->lock);
|
|
|
|
|
2007-02-14 12:20:03 +00:00
|
|
|
runtime->private_data = prtd;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int s3c24xx_pcm_close(struct snd_pcm_substream *substream)
|
|
|
|
{
|
|
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
struct s3c24xx_runtime_data *prtd = runtime->private_data;
|
|
|
|
|
2009-03-06 18:04:34 +00:00
|
|
|
pr_debug("Entered %s\n", __func__);
|
2007-02-14 12:20:03 +00:00
|
|
|
|
2008-04-30 15:19:32 +00:00
|
|
|
if (!prtd)
|
2009-03-06 18:04:34 +00:00
|
|
|
pr_debug("s3c24xx_pcm_close called with prtd == NULL\n");
|
2007-02-14 12:20:03 +00:00
|
|
|
|
2008-04-30 15:19:32 +00:00
|
|
|
kfree(prtd);
|
|
|
|
|
2007-02-14 12:20:03 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream,
|
|
|
|
struct vm_area_struct *vma)
|
|
|
|
{
|
|
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
|
2009-03-06 18:04:34 +00:00
|
|
|
pr_debug("Entered %s\n", __func__);
|
2007-02-14 12:20:03 +00:00
|
|
|
|
|
|
|
return dma_mmap_writecombine(substream->pcm->card->dev, vma,
|
2008-04-30 15:19:32 +00:00
|
|
|
runtime->dma_area,
|
|
|
|
runtime->dma_addr,
|
|
|
|
runtime->dma_bytes);
|
2007-02-14 12:20:03 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct snd_pcm_ops s3c24xx_pcm_ops = {
|
|
|
|
.open = s3c24xx_pcm_open,
|
|
|
|
.close = s3c24xx_pcm_close,
|
|
|
|
.ioctl = snd_pcm_lib_ioctl,
|
|
|
|
.hw_params = s3c24xx_pcm_hw_params,
|
|
|
|
.hw_free = s3c24xx_pcm_hw_free,
|
|
|
|
.prepare = s3c24xx_pcm_prepare,
|
|
|
|
.trigger = s3c24xx_pcm_trigger,
|
|
|
|
.pointer = s3c24xx_pcm_pointer,
|
|
|
|
.mmap = s3c24xx_pcm_mmap,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int s3c24xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
|
|
|
|
{
|
|
|
|
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
|
|
|
|
struct snd_dma_buffer *buf = &substream->dma_buffer;
|
|
|
|
size_t size = s3c24xx_pcm_hardware.buffer_bytes_max;
|
|
|
|
|
2009-03-06 18:04:34 +00:00
|
|
|
pr_debug("Entered %s\n", __func__);
|
2007-02-14 12:20:03 +00:00
|
|
|
|
|
|
|
buf->dev.type = SNDRV_DMA_TYPE_DEV;
|
|
|
|
buf->dev.dev = pcm->card->dev;
|
|
|
|
buf->private_data = NULL;
|
|
|
|
buf->area = dma_alloc_writecombine(pcm->card->dev, size,
|
|
|
|
&buf->addr, GFP_KERNEL);
|
|
|
|
if (!buf->area)
|
|
|
|
return -ENOMEM;
|
|
|
|
buf->bytes = size;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
|
|
|
|
{
|
|
|
|
struct snd_pcm_substream *substream;
|
|
|
|
struct snd_dma_buffer *buf;
|
|
|
|
int stream;
|
|
|
|
|
2009-03-06 18:04:34 +00:00
|
|
|
pr_debug("Entered %s\n", __func__);
|
2007-02-14 12:20:03 +00:00
|
|
|
|
|
|
|
for (stream = 0; stream < 2; stream++) {
|
|
|
|
substream = pcm->streams[stream].substream;
|
|
|
|
if (!substream)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
buf = &substream->dma_buffer;
|
|
|
|
if (!buf->area)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
dma_free_writecombine(pcm->card->dev, buf->bytes,
|
|
|
|
buf->area, buf->addr);
|
|
|
|
buf->area = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-04-07 02:01:15 +00:00
|
|
|
static u64 s3c24xx_pcm_dmamask = DMA_BIT_MASK(32);
|
2007-02-14 12:20:03 +00:00
|
|
|
|
2008-04-30 15:19:32 +00:00
|
|
|
static int s3c24xx_pcm_new(struct snd_card *card,
|
2008-07-07 15:08:24 +00:00
|
|
|
struct snd_soc_dai *dai, struct snd_pcm *pcm)
|
2007-02-14 12:20:03 +00:00
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
|
2009-03-06 18:04:34 +00:00
|
|
|
pr_debug("Entered %s\n", __func__);
|
2007-02-14 12:20:03 +00:00
|
|
|
|
|
|
|
if (!card->dev->dma_mask)
|
|
|
|
card->dev->dma_mask = &s3c24xx_pcm_dmamask;
|
|
|
|
if (!card->dev->coherent_dma_mask)
|
|
|
|
card->dev->coherent_dma_mask = 0xffffffff;
|
|
|
|
|
|
|
|
if (dai->playback.channels_min) {
|
|
|
|
ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
|
|
|
|
SNDRV_PCM_STREAM_PLAYBACK);
|
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (dai->capture.channels_min) {
|
|
|
|
ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
|
|
|
|
SNDRV_PCM_STREAM_CAPTURE);
|
|
|
|
if (ret)
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct snd_soc_platform s3c24xx_soc_platform = {
|
|
|
|
.name = "s3c24xx-audio",
|
|
|
|
.pcm_ops = &s3c24xx_pcm_ops,
|
|
|
|
.pcm_new = s3c24xx_pcm_new,
|
|
|
|
.pcm_free = s3c24xx_pcm_free_dma_buffers,
|
|
|
|
};
|
|
|
|
EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
|
|
|
|
|
2008-12-10 06:47:22 +00:00
|
|
|
static int __init s3c24xx_soc_platform_init(void)
|
2008-12-03 19:58:17 +00:00
|
|
|
{
|
|
|
|
return snd_soc_register_platform(&s3c24xx_soc_platform);
|
|
|
|
}
|
|
|
|
module_init(s3c24xx_soc_platform_init);
|
|
|
|
|
|
|
|
static void __exit s3c24xx_soc_platform_exit(void)
|
|
|
|
{
|
|
|
|
snd_soc_unregister_platform(&s3c24xx_soc_platform);
|
|
|
|
}
|
|
|
|
module_exit(s3c24xx_soc_platform_exit);
|
|
|
|
|
2007-02-14 12:20:03 +00:00
|
|
|
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
|
|
|
|
MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module");
|
|
|
|
MODULE_LICENSE("GPL");
|