1 files changed, 240 insertions, 0 deletions

diff --git a/sound/soc/atmel/atmel-pcm-dma.c b/sound/soc/atmel/atmel-pcm-dma.c
new file mode 100644
index 000000000000..30184a4a147a
--- /dev/null
+++ b/sound/soc/atmel/atmel-pcm-dma.c
@@ -0,0 +1,240 @@
+/*
+ * atmel-pcm-dma.c  --  ALSA PCM DMA support for the Atmel SoC.
+ *
+ *  Copyright (C) 2012 Atmel
+ *
+ * Author: Bo Shen <voice.shen@atmel.com>
+ *
+ * Based on atmel-pcm by:
+ * Sedji Gaouaou <sedji.gaouaou@atmel.com>
+ * Copyright 2008 Atmel
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/atmel-ssc.h>
+#include <linux/platform_data/dma-atmel.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
+
+#include "atmel-pcm.h"
+
+/*--------------------------------------------------------------------------*\
+ * Hardware definition
+\*--------------------------------------------------------------------------*/
+static const struct snd_pcm_hardware atmel_pcm_dma_hardware = {
+        .info                   = SNDRV_PCM_INFO_MMAP |
+                                  SNDRV_PCM_INFO_MMAP_VALID |
+                                  SNDRV_PCM_INFO_INTERLEAVED |
+                                  SNDRV_PCM_INFO_RESUME |
+                                  SNDRV_PCM_INFO_PAUSE,
+        .formats                = SNDRV_PCM_FMTBIT_S16_LE,
+        .period_bytes_min       = 256,          /* lighting DMA overhead */
+        .period_bytes_max       = 2 * 0xffff,   /* if 2 bytes format */
+        .periods_min            = 8,
+        .periods_max            = 1024,         /* no limit */
+        .buffer_bytes_max       = ATMEL_SSC_DMABUF_SIZE,
+};
+
+/**
+ * atmel_pcm_dma_irq: SSC interrupt handler for DMAENGINE enabled SSC
+ *
+ * We use DMAENGINE to send/receive data to/from SSC so this ISR is only to
+ * check if any overrun occured.
+ */
+static void atmel_pcm_dma_irq(u32 ssc_sr,
+        struct snd_pcm_substream *substream)
+{
+        struct atmel_pcm_dma_params *prtd;
+
+        prtd = snd_dmaengine_pcm_get_data(substream);
+
+        if (ssc_sr & prtd->mask->ssc_error) {
+                if (snd_pcm_running(substream))
+                        pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x)\n",
+                                substream->stream == SNDRV_PCM_STREAM_PLAYBACK
+                                ? "underrun" : "overrun", prtd->name,
+                                ssc_sr);
+
+                /* stop RX and capture: will be enabled again at restart */
+                ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_disable);
+                snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+
+                /* now drain RHR and read status to remove xrun condition */
+                ssc_readx(prtd->ssc->regs, SSC_RHR);
+                ssc_readx(prtd->ssc->regs, SSC_SR);
+        }
+}
+
+/*--------------------------------------------------------------------------*\
+ * DMAENGINE operations
+\*--------------------------------------------------------------------------*/
+static bool filter(struct dma_chan *chan, void *slave)
+{
+        struct at_dma_slave *sl = slave;
+
+        if (sl->dma_dev == chan->device->dev) {
+                chan->private = sl;
+                return true;
+        } else {
+                return false;
+        }
+}
+
+static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream,
+        struct snd_pcm_hw_params *params)
+{
+        struct atmel_pcm_dma_params *prtd;
+        struct ssc_device *ssc;
+        struct dma_chan *dma_chan;
+        struct dma_slave_config slave_config;
+        int ret;
+
+        prtd = snd_dmaengine_pcm_get_data(substream);
+        ssc = prtd->ssc;
+
+        ret = snd_hwparams_to_dma_slave_config(substream, params,
+                        &slave_config);
+        if (ret) {
+                pr_err("atmel-pcm: hwparams to dma slave configure failed\n");
+                return ret;
+        }
+
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                slave_config.dst_addr = (dma_addr_t)ssc->phybase + SSC_THR;
+                slave_config.dst_maxburst = 1;
+        } else {
+                slave_config.src_addr = (dma_addr_t)ssc->phybase + SSC_RHR;
+                slave_config.src_maxburst = 1;
+        }
+
+        slave_config.device_fc = false;
+
+        dma_chan = snd_dmaengine_pcm_get_chan(substream);
+        if (dmaengine_slave_config(dma_chan, &slave_config)) {
+                pr_err("atmel-pcm: failed to configure dma channel\n");
+                ret = -EBUSY;
+                return ret;
+        }
+
+        return 0;
+}
+
+static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
+        struct snd_pcm_hw_params *params)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct atmel_pcm_dma_params *prtd;
+        struct ssc_device *ssc;
+        struct at_dma_slave *sdata = NULL;
+        int ret;
+
+        snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
+
+        prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+        ssc = prtd->ssc;
+        if (ssc->pdev)
+                sdata = ssc->pdev->dev.platform_data;
+
+        ret = snd_dmaengine_pcm_open(substream, filter, sdata);
+        if (ret) {
+                pr_err("atmel-pcm: dmaengine pcm open failed\n");
+                return -EINVAL;
+        }
+
+        snd_dmaengine_pcm_set_data(substream, prtd);
+
+        ret = atmel_pcm_configure_dma(substream, params);
+        if (ret) {
+                pr_err("atmel-pcm: failed to configure dmai\n");
+                goto err;
+        }
+
+        prtd->dma_intr_handler = atmel_pcm_dma_irq;
+
+        return 0;
+err:
+        snd_dmaengine_pcm_close(substream);
+        return ret;
+}
+
+static int atmel_pcm_dma_prepare(struct snd_pcm_substream *substream)
+{
+        struct atmel_pcm_dma_params *prtd;
+
+        prtd = snd_dmaengine_pcm_get_data(substream);
+
+        ssc_writex(prtd->ssc->regs, SSC_IER, prtd->mask->ssc_error);
+        ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_enable);
+
+        return 0;
+}
+
+static int atmel_pcm_open(struct snd_pcm_substream *substream)
+{
+        snd_soc_set_runtime_hwparams(substream, &atmel_pcm_dma_hardware);
+
+        return 0;
+}
+
+static int atmel_pcm_close(struct snd_pcm_substream *substream)
+{
+        snd_dmaengine_pcm_close(substream);
+
+        return 0;
+}
+
+static struct snd_pcm_ops atmel_pcm_ops = {
+        .open           = atmel_pcm_open,
+        .close          = atmel_pcm_close,
+        .ioctl          = snd_pcm_lib_ioctl,
+        .hw_params      = atmel_pcm_hw_params,
+        .prepare        = atmel_pcm_dma_prepare,
+        .trigger        = snd_dmaengine_pcm_trigger,
+        .pointer        = snd_dmaengine_pcm_pointer_no_residue,
+        .mmap           = atmel_pcm_mmap,
+};
+
+static struct snd_soc_platform_driver atmel_soc_platform = {
+        .ops            = &atmel_pcm_ops,
+        .pcm_new        = atmel_pcm_new,
+        .pcm_free       = atmel_pcm_free,
+};
+
+int atmel_pcm_dma_platform_register(struct device *dev)
+{
+        return snd_soc_register_platform(dev, &atmel_soc_platform);
+}
+EXPORT_SYMBOL(atmel_pcm_dma_platform_register);
+
+void atmel_pcm_dma_platform_unregister(struct device *dev)
+{
+        snd_soc_unregister_platform(dev);
+}
+EXPORT_SYMBOL(atmel_pcm_dma_platform_unregister);
+
+MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
+MODULE_DESCRIPTION("Atmel DMA based PCM module");
+MODULE_LICENSE("GPL");