[PATCH] ASoC: blackfin: add bf6xx audio dma driver

Scott Jiang

2014-09-24 09:55:20 UTC

Bf5xx and bf6xx reused bf5xx-i2s-pcm.c before. Recently tdm driver
has been merged into bf5xx-i2s-pcm.c and it's not compatible with
bf6xx audio. So create this dma driver and add tdm support later.

Signed-off-by: Scott Jiang <***@gmail.com>
---
sound/soc/blackfin/Kconfig | 22 ++--
sound/soc/blackfin/Makefile | 2 +
sound/soc/blackfin/bf6xx-pcm.c | 230 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 248 insertions(+), 6 deletions(-)
create mode 100644 sound/soc/blackfin/bf6xx-pcm.c

diff --git a/sound/soc/blackfin/Kconfig b/sound/soc/blackfin/Kconfig
index 6410aa2..9d6bd9d 100644
--- a/sound/soc/blackfin/Kconfig
+++ b/sound/soc/blackfin/Kconfig
@@ -1,8 +1,17 @@
config SND_BF5XX_I2S
tristate "SoC I2S Audio for the ADI Blackfin chip"
- depends on BLACKFIN
- select SND_BF5XX_SOC_SPORT if !BF60x
- select SND_BF6XX_SOC_SPORT if BF60x
+ depends on BLACKFIN && !BF60x
+ select SND_BF5XX_SOC_SPORT
+ help
+ Say Y or M if you want to add support for codecs attached to
+ the Blackfin SPORT (synchronous serial ports) interface in I2S
+ mode (supports single stereo In/Out).
+ You will also need to select the audio interfaces to support below.
+
+config SND_BF6XX_PCM
+ tristate "SoC Audio for the ADI Blackfin BF6xx chip"
+ depends on BF60x
+ select SND_BF6XX_SOC_SPORT
help
Say Y or M if you want to add support for codecs attached to
the Blackfin SPORT (synchronous serial ports) interface in I2S
@@ -11,7 +20,7 @@ config SND_BF5XX_I2S

config SND_BF5XX_SOC_SSM2602
tristate "SoC SSM2602 Audio Codec Add-On Card support"
- depends on SND_BF5XX_I2S && SND_SOC_I2C_AND_SPI
+ depends on (SND_BF5XX_I2S || SND_BF6XX_PCM) && SND_SOC_I2C_AND_SPI
select SND_BF5XX_SOC_I2S if !BF60x
select SND_BF6XX_SOC_I2S if BF60x
select SND_SOC_SSM2602_SPI if SPI_MASTER
@@ -45,8 +54,9 @@ config SND_SOC_BFIN_EVAL_ADAU1373

config SND_SOC_BFIN_EVAL_ADAU1X61
tristate "Support for the EVAL-ADAU1X61 board on Blackfin eval boards"
- depends on SND_BF5XX_I2S && I2C
- select SND_BF5XX_SOC_I2S
+ depends on (SND_BF5XX_I2S || SND_BF6XX_PCM) && I2C
+ select SND_BF5XX_SOC_I2S if !BF60x
+ select SND_BF6XX_SOC_I2S if BF60x
select SND_SOC_ADAU1761_I2C
help
Say Y if you want to add support for the Analog Devices EVAL-ADAU1X61
diff --git a/sound/soc/blackfin/Makefile b/sound/soc/blackfin/Makefile
index f21e948..cef39f6 100644
--- a/sound/soc/blackfin/Makefile
+++ b/sound/soc/blackfin/Makefile
@@ -1,6 +1,7 @@
# Blackfin Platform Support
snd-bf5xx-ac97-objs := bf5xx-ac97-pcm.o
snd-bf5xx-i2s-objs := bf5xx-i2s-pcm.o
+snd-bf6xx-pcm-objs := bf6xx-pcm.o
snd-soc-bf5xx-sport-objs := bf5xx-sport.o
snd-soc-bf6xx-sport-objs := bf6xx-sport.o
snd-soc-bf5xx-ac97-objs := bf5xx-ac97.o
@@ -9,6 +10,7 @@ snd-soc-bf6xx-i2s-objs := bf6xx-i2s.o

obj-$(CONFIG_SND_BF5XX_AC97) += snd-bf5xx-ac97.o
obj-$(CONFIG_SND_BF5XX_I2S) += snd-bf5xx-i2s.o
+obj-$(CONFIG_SND_BF6XX_PCM) += snd-bf6xx-pcm.o
obj-$(CONFIG_SND_BF5XX_SOC_SPORT) += snd-soc-bf5xx-sport.o
obj-$(CONFIG_SND_BF6XX_SOC_SPORT) += snd-soc-bf6xx-sport.o
obj-$(CONFIG_SND_BF5XX_SOC_AC97) += snd-soc-bf5xx-ac97.o
diff --git a/sound/soc/blackfin/bf6xx-pcm.c b/sound/soc/blackfin/bf6xx-pcm.c
new file mode 100644
index 0000000..bad9fbf
--- /dev/null
+++ b/sound/soc/blackfin/bf6xx-pcm.c
@@ -0,0 +1,230 @@
+/*
+ * bf6xx-pcm.c - Analog Devices BF6XX audio dma driver
+ *
+ * Copyright (c) 2014 Analog Devices Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#include "bf6xx-sport.h"
+
+static void bf6xx_dma_irq(void *data)
+{
+ struct snd_pcm_substream *pcm = data;
+ snd_pcm_period_elapsed(pcm);
+}
+
+static const struct snd_pcm_hardware bf6xx_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 bf6xx_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ size_t size = params_buffer_bytes(params);
+ snd_pcm_lib_malloc_pages(substream, size);
+
+ return 0;
+}
+
+static int bf6xx_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ snd_pcm_lib_free_pages(substream);
+
+ return 0;
+}
+
+static int bf6xx_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);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ sport_set_tx_callback(sport, bf6xx_dma_irq, substream);
+ sport_config_tx_dma(sport, runtime->dma_area,
+ runtime->periods, period_bytes);
+ } else {
+ sport_set_rx_callback(sport, bf6xx_dma_irq, substream);
+ sport_config_rx_dma(sport, runtime->dma_area,
+ runtime->periods, period_bytes);
+ }
+
+ return 0;
+}
+
+static int bf6xx_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;
+
+ 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 bf6xx_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;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ diff = sport_curr_offset_tx(sport);
+ else
+ diff = sport_curr_offset_rx(sport);
+
+ /*
+ * TX at least can report one frame beyond the end of the
+ * buffer if we hit the wraparound case - clamp to within the
+ * buffer as the ALSA APIs require.
+ */
+ if (diff == snd_pcm_lib_buffer_bytes(substream))
+ diff = 0;
+
+ frames = bytes_to_frames(substream->runtime, diff);
+
+ return frames;
+}
+
+static int bf6xx_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+ struct sport_device *sport = snd_soc_dai_get_drvdata(cpu_dai);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_dma_buffer *buf = &substream->dma_buffer;
+ int ret;
+
+ snd_soc_set_runtime_hwparams(substream, &bf6xx_pcm_hardware);
+
+ ret = snd_pcm_hw_constraint_integer(runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ if (ret < 0)
+ return ret;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ sport->tx_buf = buf->area;
+ else
+ sport->rx_buf = buf->area;
+
+ runtime->private_data = sport;
+ return 0;
+}
+
+static int bf6xx_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 ;
+}
+
+static struct snd_pcm_ops bf6xx_pcm_ops = {
+ .open = bf6xx_pcm_open,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = bf6xx_pcm_hw_params,
+ .hw_free = bf6xx_pcm_hw_free,
+ .prepare = bf6xx_pcm_prepare,
+ .trigger = bf6xx_pcm_trigger,
+ .pointer = bf6xx_pcm_pointer,
+ .mmap = bf6xx_pcm_mmap,
+};
+
+static int bf6xx_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_card *card = rtd->card->snd_card;
+ size_t size = bf6xx_pcm_hardware.buffer_bytes_max;
+ int ret = 0;
+
+ ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+ if (ret)
+ return ret;
+
+ return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
+ SNDRV_DMA_TYPE_DEV, card->dev, size, size);
+}
+
+static struct snd_soc_platform_driver bf6xx_soc_platform = {
+ .ops = &bf6xx_pcm_ops,
+ .pcm_new = bf6xx_pcm_new,
+};
+
+static int bfin_soc_platform_probe(struct platform_device *pdev)
+{
+ return snd_soc_register_platform(&pdev->dev, &bf6xx_soc_platform);
+}
+
+static int bfin_soc_platform_remove(struct platform_device *pdev)
+{
+ snd_soc_unregister_platform(&pdev->dev);
+ return 0;
+}
+
+static struct platform_driver bfin_pcm_driver = {
+ .driver = {
+ .name = "bfin-i2s-pcm-audio",
+ .owner = THIS_MODULE,
+ },
+
+ .probe = bfin_soc_platform_probe,
+ .remove = bfin_soc_platform_remove,
+};
+
+module_platform_driver(bfin_pcm_driver);
+
+MODULE_DESCRIPTION("Analog Devices BF6XX audio dma driver");
+MODULE_AUTHOR("Scott Jiang <***@gmail.com>");
+MODULE_LICENSE("GPL v2");

--
1.7.9.5