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+/*
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+ * atmel-pcm-dma.c -- ALSA PCM DMA support for the Atmel SoC.
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+ *
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+ * Copyright (C) 2012 Atmel
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+ *
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+ * Author: Bo Shen <voice.shen@atmel.com>
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+ *
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+ * Based on atmel-pcm by:
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+ * Sedji Gaouaou <sedji.gaouaou@atmel.com>
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+ * Copyright 2008 Atmel
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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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+
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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/dmaengine.h>
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+#include <linux/atmel-ssc.h>
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+#include <linux/platform_data/dma-atmel.h>
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+
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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 <sound/dmaengine_pcm.h>
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+
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+#include "atmel-pcm.h"
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+
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+/*--------------------------------------------------------------------------*\
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+ * Hardware definition
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+\*--------------------------------------------------------------------------*/
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+static const struct snd_pcm_hardware atmel_pcm_dma_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_RESUME |
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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 = 256, /* lighting DMA overhead */
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+ .period_bytes_max = 2 * 0xffff, /* if 2 bytes format */
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+ .periods_min = 8,
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+ .periods_max = 1024, /* no limit */
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+ .buffer_bytes_max = ATMEL_SSC_DMABUF_SIZE,
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+};
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+
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+/**
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+ * atmel_pcm_dma_irq: SSC interrupt handler for DMAENGINE enabled SSC
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+ *
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+ * We use DMAENGINE to send/receive data to/from SSC so this ISR is only to
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+ * check if any overrun occured.
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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_pcm_dma_params *prtd;
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+
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+ prtd = snd_dmaengine_pcm_get_data(substream);
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+
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+ if (ssc_sr & prtd->mask->ssc_error) {
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+ if (snd_pcm_running(substream))
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+ pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x)\n",
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+ substream->stream == SNDRV_PCM_STREAM_PLAYBACK
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+ ? "underrun" : "overrun", prtd->name,
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+ ssc_sr);
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+
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+ /* stop RX and capture: will be enabled again at restart */
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+ ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_disable);
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+ snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
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+
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+ /* now drain RHR and read status to remove xrun condition */
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+ ssc_readx(prtd->ssc->regs, SSC_RHR);
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+ ssc_readx(prtd->ssc->regs, SSC_SR);
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+ }
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+}
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+
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+/*--------------------------------------------------------------------------*\
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+ * DMAENGINE operations
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+\*--------------------------------------------------------------------------*/
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+static bool filter(struct dma_chan *chan, void *slave)
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+{
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+ struct at_dma_slave *sl = slave;
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+
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+ if (sl->dma_dev == chan->device->dev) {
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+ chan->private = sl;
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+ return true;
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+ } else {
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+ return false;
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+ }
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+}
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+
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+static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream,
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+ struct snd_pcm_hw_params *params)
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+{
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+ struct atmel_pcm_dma_params *prtd;
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+ struct ssc_device *ssc;
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+ struct dma_chan *dma_chan;
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+ struct dma_slave_config slave_config;
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+ int ret;
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+
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+ prtd = snd_dmaengine_pcm_get_data(substream);
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+ ssc = prtd->ssc;
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+
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+ ret = snd_hwparams_to_dma_slave_config(substream, params,
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+ &slave_config);
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+ if (ret) {
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+ pr_err("atmel-pcm: hwparams to dma slave configure failed\n");
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+ return ret;
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+ }
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+
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+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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+ slave_config.dst_addr = (dma_addr_t)ssc->phybase + SSC_THR;
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+ slave_config.dst_maxburst = 1;
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+ } else {
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+ slave_config.src_addr = (dma_addr_t)ssc->phybase + SSC_RHR;
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+ slave_config.src_maxburst = 1;
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+ }
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+
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+ slave_config.device_fc = false;
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+
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+ dma_chan = snd_dmaengine_pcm_get_chan(substream);
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+ if (dmaengine_slave_config(dma_chan, &slave_config)) {
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+ pr_err("atmel-pcm: failed to configure dma channel\n");
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+ ret = -EBUSY;
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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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_soc_pcm_runtime *rtd = substream->private_data;
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+ struct atmel_pcm_dma_params *prtd;
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+ struct ssc_device *ssc;
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+ struct at_dma_slave *sdata = NULL;
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+ int ret;
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+
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+ snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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+
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+ prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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+ ssc = prtd->ssc;
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+ if (ssc->pdev)
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+ sdata = ssc->pdev->dev.platform_data;
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+
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+ ret = snd_dmaengine_pcm_open(substream, filter, sdata);
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+ if (ret) {
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+ pr_err("atmel-pcm: dmaengine pcm open failed\n");
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+ return -EINVAL;
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+ }
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+
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+ snd_dmaengine_pcm_set_data(substream, prtd);
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+
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+ ret = atmel_pcm_configure_dma(substream, params);
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+ if (ret) {
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+ pr_err("atmel-pcm: failed to configure dmai\n");
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+ goto err;
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+ }
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+
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+ prtd->dma_intr_handler = atmel_pcm_dma_irq;
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+
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+ return 0;
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+err:
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+ snd_dmaengine_pcm_close(substream);
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+ return ret;
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+}
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+
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+static int atmel_pcm_dma_prepare(struct snd_pcm_substream *substream)
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+{
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+ struct atmel_pcm_dma_params *prtd;
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+
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+ prtd = snd_dmaengine_pcm_get_data(substream);
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+
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+ ssc_writex(prtd->ssc->regs, SSC_IER, prtd->mask->ssc_error);
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+ ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_enable);
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+
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+ return 0;
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+}
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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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+ snd_soc_set_runtime_hwparams(substream, &atmel_pcm_dma_hardware);
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+
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+ return 0;
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+}
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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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+ snd_dmaengine_pcm_close(substream);
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+
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+ return 0;
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+}
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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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+ .prepare = atmel_pcm_dma_prepare,
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+ .trigger = snd_dmaengine_pcm_trigger,
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+ .pointer = snd_dmaengine_pcm_pointer_no_residue,
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+ .mmap = atmel_pcm_mmap,
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+};
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+
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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,
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+};
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+
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+int atmel_pcm_dma_platform_register(struct device *dev)
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+{
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+ return snd_soc_register_platform(dev, &atmel_soc_platform);
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+}
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+EXPORT_SYMBOL(atmel_pcm_dma_platform_register);
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+
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+void atmel_pcm_dma_platform_unregister(struct device *dev)
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+{
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+ snd_soc_unregister_platform(dev);
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+}
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+EXPORT_SYMBOL(atmel_pcm_dma_platform_unregister);
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+
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+MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
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+MODULE_DESCRIPTION("Atmel DMA based PCM module");
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+MODULE_LICENSE("GPL");
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Bo Shen