sound: ASoC: Blackfin: DMA Driver for I2S sound chip

Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 288 insertions, 0 deletions

diff --git a/sound/soc/blackfin/bf5xx-i2s-pcm.c b/sound/soc/blackfin/bf5xx-i2s-pcm.c
new file mode 100644
index 000000000000..61fccf925192
--- /dev/null
+++ b/sound/soc/blackfin/bf5xx-i2s-pcm.c
@@ -0,0 +1,288 @@
+/*
+ * File:         sound/soc/blackfin/bf5xx-i2s-pcm.c
+ * Author:       Cliff Cai <Cliff.Cai@analog.com>
+ *
+ * Created:      Tue June 06 2008
+ * Description:  DMA driver for i2s codec
+ *
+ * Modified:
+ *               Copyright 2008 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <asm/dma.h>
+
+#include "bf5xx-i2s-pcm.h"
+#include "bf5xx-i2s.h"
+#include "bf5xx-sport.h"
+
+static void bf5xx_dma_irq(void *data)
+{
+        struct snd_pcm_substream *pcm = data;
+        snd_pcm_period_elapsed(pcm);
+}
+
+static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
+        .info                   = SNDRV_PCM_INFO_INTERLEAVED |
+                                   SNDRV_PCM_INFO_MMAP |
+                                   SNDRV_PCM_INFO_MMAP_VALID |
+                                   SNDRV_PCM_INFO_BLOCK_TRANSFER,
+        .formats                = SNDRV_PCM_FMTBIT_S16_LE |
+                                   SNDRV_PCM_FMTBIT_S24_LE |
+                                   SNDRV_PCM_FMTBIT_S32_LE,
+        .period_bytes_min       = 32,
+        .period_bytes_max       = 0x10000,
+        .periods_min            = 1,
+        .periods_max            = PAGE_SIZE/32,
+        .buffer_bytes_max       = 0x20000, /* 128 kbytes */
+        .fifo_size              = 16,
+};
+
+static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
+        struct snd_pcm_hw_params *params)
+{
+        size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
+        snd_pcm_lib_malloc_pages(substream, size);
+
+        return 0;
+}
+
+static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+        snd_pcm_lib_free_pages(substream);
+
+        return 0;
+}
+
+static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct sport_device *sport = runtime->private_data;
+        int period_bytes = frames_to_bytes(runtime, runtime->period_size);
+
+        pr_debug("%s enter\n", __func__);
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
+                sport_config_tx_dma(sport, runtime->dma_area,
+                        runtime->periods, period_bytes);
+        } else {
+                sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
+                sport_config_rx_dma(sport, runtime->dma_area,
+                        runtime->periods, period_bytes);
+        }
+
+        return 0;
+}
+
+static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct sport_device *sport = runtime->private_data;
+        int ret = 0;
+
+        pr_debug("%s enter\n", __func__);
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+                if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                        sport_tx_start(sport);
+                else
+                        sport_rx_start(sport);
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+                        sport_tx_stop(sport);
+                else
+                        sport_rx_stop(sport);
+                break;
+        default:
+                ret = -EINVAL;
+        }
+
+        return ret;
+}
+
+static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct sport_device *sport = runtime->private_data;
+        unsigned int diff;
+        snd_pcm_uframes_t frames;
+        pr_debug("%s enter\n", __func__);
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                diff = sport_curr_offset_tx(sport);
+                frames = bytes_to_frames(substream->runtime, diff);
+        } else {
+                diff = sport_curr_offset_rx(sport);
+                frames = bytes_to_frames(substream->runtime, diff);
+        }
+        return frames;
+}
+
+static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        int ret;
+
+        pr_debug("%s enter\n", __func__);
+        snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
+
+        ret = snd_pcm_hw_constraint_integer(runtime, \
+                        SNDRV_PCM_HW_PARAM_PERIODS);
+        if (ret < 0)
+                goto out;
+
+        if (sport_handle != NULL)
+                runtime->private_data = sport_handle;
+        else {
+                pr_err("sport_handle is NULL\n");
+                return -1;
+        }
+        return 0;
+
+ out:
+        return ret;
+}
+
+static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
+        struct vm_area_struct *vma)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        size_t size = vma->vm_end - vma->vm_start;
+        vma->vm_start = (unsigned long)runtime->dma_area;
+        vma->vm_end = vma->vm_start + size;
+        vma->vm_flags |=  VM_SHARED;
+
+        return 0 ;
+}
+
+struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
+        .open           = bf5xx_pcm_open,
+        .ioctl          = snd_pcm_lib_ioctl,
+        .hw_params      = bf5xx_pcm_hw_params,
+        .hw_free        = bf5xx_pcm_hw_free,
+        .prepare        = bf5xx_pcm_prepare,
+        .trigger        = bf5xx_pcm_trigger,
+        .pointer        = bf5xx_pcm_pointer,
+        .mmap           = bf5xx_pcm_mmap,
+};
+
+static int bf5xx_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 = bf5xx_pcm_hardware.buffer_bytes_max;
+
+        buf->dev.type = SNDRV_DMA_TYPE_DEV;
+        buf->dev.dev = pcm->card->dev;
+        buf->private_data = NULL;
+        buf->area = dma_alloc_coherent(pcm->card->dev, size,
+                        &buf->addr, GFP_KERNEL);
+        if (!buf->area) {
+                pr_err("Failed to allocate dma memory \
+                        Please increase uncached DMA memory region\n");
+                return -ENOMEM;
+        }
+        buf->bytes = size;
+
+        pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
+                buf->area, buf->bytes);
+
+        if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+                sport_handle->tx_buf = buf->area;
+        else
+                sport_handle->rx_buf = buf->area;
+
+        return 0;
+}
+
+static void bf5xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
+{
+        struct snd_pcm_substream *substream;
+        struct snd_dma_buffer *buf;
+        int stream;
+
+        for (stream = 0; stream < 2; stream++) {
+                substream = pcm->streams[stream].substream;
+                if (!substream)
+                        continue;
+
+                buf = &substream->dma_buffer;
+                if (!buf->area)
+                        continue;
+                dma_free_coherent(NULL, buf->bytes, buf->area, 0);
+                buf->area = NULL;
+        }
+        if (sport_handle)
+                sport_done(sport_handle);
+}
+
+static u64 bf5xx_pcm_dmamask = DMA_32BIT_MASK;
+
+int bf5xx_pcm_i2s_new(struct snd_card *card, struct snd_soc_dai *dai,
+        struct snd_pcm *pcm)
+{
+        int ret = 0;
+
+        pr_debug("%s enter\n", __func__);
+        if (!card->dev->dma_mask)
+                card->dev->dma_mask = &bf5xx_pcm_dmamask;
+        if (!card->dev->coherent_dma_mask)
+                card->dev->coherent_dma_mask = DMA_32BIT_MASK;
+
+        if (dai->playback.channels_min) {
+                ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
+                        SNDRV_PCM_STREAM_PLAYBACK);
+                if (ret)
+                        goto out;
+        }
+
+        if (dai->capture.channels_min) {
+                ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
+                        SNDRV_PCM_STREAM_CAPTURE);
+                if (ret)
+                        goto out;
+        }
+ out:
+        return ret;
+}
+
+struct snd_soc_platform bf5xx_i2s_soc_platform = {
+        .name           = "bf5xx-audio",
+        .pcm_ops        = &bf5xx_pcm_i2s_ops,
+        .pcm_new        = bf5xx_pcm_i2s_new,
+        .pcm_free       = bf5xx_pcm_free_dma_buffers,
+};
+EXPORT_SYMBOL_GPL(bf5xx_i2s_soc_platform);
+
+MODULE_AUTHOR("Cliff Cai");
+MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
+MODULE_LICENSE("GPL");