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From gn...@apache.org
Subject [incubator-nuttx] 04/06: cxd56: add initial Nuttx audio driver
Date Thu, 16 Apr 2020 18:50:20 GMT
This is an automated email from the ASF dual-hosted git repository.

gnutt pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git

commit 57e8f0451a17e7c01c6a6890b902a08c86207318
Author: Tobias Johansson <tobias.johansson@sony.com>
AuthorDate: Tue Apr 7 07:50:38 2020 +0200

    cxd56: add initial Nuttx audio driver
    
    Adds an initial Nuttx audio driver supporting the Spresense CXD56.
    Being a work in progress the driver has a number of limitations:
    - Audio playback only, no recording yet.
    - Only 16 bit stereo playback is supported.
    - In practice only 48kHz playback is supported due to missing SRC.
    - Configure driver in "Device Drivers --> Audio Device Support".
---
 drivers/audio/Kconfig       |   29 +
 drivers/audio/Make.defs     |    4 +
 drivers/audio/cxd56.c       | 2267 +++++++++++++++++++++++++++++++++++++++++++
 drivers/audio/cxd56.h       |  271 ++++++
 include/nuttx/audio/cxd56.h |   85 ++
 5 files changed, 2656 insertions(+)

diff --git a/drivers/audio/Kconfig b/drivers/audio/Kconfig
index f632ff0..735718a 100644
--- a/drivers/audio/Kconfig
+++ b/drivers/audio/Kconfig
@@ -27,6 +27,35 @@ if AUDIO_TONE
 
 endif # AUDIO_TONE
 
+config AUDIO_CXD56
+	bool "CXD56 audio driver"
+	default n
+	depends on AUDIO
+	select AUDIO_DRIVER_SPECIFIC_BUFFERS
+	---help---
+		Enable support for audio playback using the CXD5247 chip on the
+		CXD56 Spresense board.
+
+if AUDIO_CXD56
+
+if AUDIO_DRIVER_SPECIFIC_BUFFERS
+
+config CXD56_AUDIO_NUM_BUFFERS
+	int "Number of audio buffers to use"
+	default 4
+
+config CXD56_AUDIO_BUFFER_SIZE
+	int "Size of each audio buffer"
+	default 4096
+
+endif # AUDIO_DRIVER_SPECIFIC_BUFFERS
+
+config CXD56_AUDIO_WORKER_STACKSIZE
+	int "Worker thread stack size"
+	default 768
+
+endif # AUDIO_CXD56
+
 config AUDIO_VS1053
 	bool "VS1053 codec chip"
 	default n
diff --git a/drivers/audio/Make.defs b/drivers/audio/Make.defs
index cd2ab4a..a3b607c 100644
--- a/drivers/audio/Make.defs
+++ b/drivers/audio/Make.defs
@@ -39,6 +39,10 @@
 
 ifeq ($(CONFIG_DRIVERS_AUDIO),y)
 
+ifeq ($(CONFIG_AUDIO_CXD56),y)
+CSRCS += cxd56.c
+endif
+
 ifeq ($(CONFIG_AUDIO_VS1053),y)
 CSRCS += vs1053.c
 endif
diff --git a/drivers/audio/cxd56.c b/drivers/audio/cxd56.c
new file mode 100644
index 0000000..fa25915
--- /dev/null
+++ b/drivers/audio/cxd56.c
@@ -0,0 +1,2267 @@
+/****************************************************************************
+ * drivers/audio/cxd56.h
+ *
+ *   Copyright 2019 Sony Semiconductor Solutions Corporation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <fcntl.h>
+#include <errno.h>
+#include <queue.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/config.h>
+#include <nuttx/irq.h>
+#include <nuttx/kmalloc.h>
+#include <nuttx/mqueue.h>
+
+#include <arch/board/cxd56_clock.h>
+#include <arch/board/board.h>
+#include <arch/chip/audio.h>
+
+#include "cxd56.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define REG_BASE     0x0e300000
+#define REG_BASE_INT 0xe0045000
+
+#define CXD56_GEN_MASK(len, pos) (((len) == 32) ? 0xffffffff : \
+                                  ((1 << (len)) - 1) << (pos))
+
+#define CXD56_IRQ1_BIT_MIC  (1 << 6)   /* AU0 */
+#define CXD56_IRQ1_BIT_I2S1 (1 << 7)   /* AU1 */
+
+#define CXD56_VOL_MIN            -1020
+#define CXD56_VOL_MAX            120
+#define CXD56_VOL_MUTE           (CXD56_VOL_MIN - 1)
+#define CXD56_VOL_RANGE          (CXD56_VOL_MAX - CXD56_VOL_MIN)
+#define CXD56_VOL_NX_TO_CXD56(v) ((int)((float)((v) / 1000.0) * CXD56_VOL_RANGE) \
+                                 + CXD56_VOL_MIN)
+#define CXD56_VOL_WAIT_TIME      20
+#define CXD56_VOL_TO_REG(vol)    (((vol) / 5) & 0xff)
+#define CXD56_VOL_MUTE_REG       0x33
+#define CXD56_VOL_MUTE_TIME(vol, cycles) \
+                                 (((CXD56_VOL_TO_REG(vol) - CXD56_VOL_MUTE_REG) & 0xff) \
+                                 * ((cycles) + 1) * 4 / 48 * 1000)
+
+#define CXD56_IN_CHANNELS_MAX  8
+#define CXD56_OUT_CHANNELS_MAX 2
+
+/* Samplerates field is split into low and high byte */
+
+#define CXD56_SUPP_RATES_L  (AUDIO_SAMP_RATE_8K  | AUDIO_SAMP_RATE_11K | \
+                             AUDIO_SAMP_RATE_16K | AUDIO_SAMP_RATE_22K | \
+                             AUDIO_SAMP_RATE_32K | AUDIO_SAMP_RATE_44K | \
+                             AUDIO_SAMP_RATE_48K)
+#define CXD56_SUPP_RATES_H  ((AUDIO_SAMP_RATE_96K  | AUDIO_SAMP_RATE_128K | \
+                              AUDIO_SAMP_RATE_192K) >> 8)
+#define CXD56_SUPP_RATES    (CXD56_SUPP_RATES_L | CXD56_SUPP_RATES_H)
+
+/* Mic selections */
+
+#define CXD56_ACA_MIC_AMIC 1  /* Analog MIC */
+
+/* External XTAL */
+
+#define CXD56_AUD_MCLK_EXT (0u<<16)
+
+/* Oscillator modes */
+
+#define CXD56_ACA_OSC_24_576MHZ       1  /* 24.576MHz */
+#define CXD56_ACA_OSC_24_576MHZ_HIRES 2  /* 24.576MHz, Hi-Res */
+#define CXD56_ACA_OSC_49_152MHZ       3  /* 49.152MHz */
+#define CXD56_ACA_OSC_49_152MHZ_HIRES 4  /* 49.152MHz, Hi-Res */
+
+/* Control IDs for external as_aca_control */
+#define CXD56_ACA_CTL_CHECK_ID          0
+#define CXD56_ACA_CTL_POWER_ON_COMMON   1
+#define CXD56_ACA_CTL_POWER_ON_OUTPUT   3
+#define CXD56_ACA_CTL_SET_SMASTER       5
+#define CXD56_ACA_CTL_POWER_OFF_COMMON  6
+#define CXD56_ACA_CTL_POWER_OFF_OUTPUT  8
+#define CXD56_ACA_CTL_SET_OUTPUT_DEVICE 13
+
+#define CXD56_EXP_REVID    0x20
+#define CXD56_EXP_DEVICEID 0x02
+
+#define CXD56_OUT_DEV_OFF (0)
+#define CXD56_OUT_DEV_SP  (1)
+
+#define CXD56_SMSTR_MODE_FS_16         1
+#define CXD56_SMSTR_MODE_FS_32         2
+#define CXD56_SMSTR_MCK_FS_512         1
+#define CXD56_SMSTR_MCK_FS_1024        2
+#define CXD56_SMSTR_CHSEL_NORMAL       1
+#define CXD56_SMSTR_PWMMD_BOTH         2
+#define CXD56_ACA_OUT_OFF              6
+#define CXD56_ACA_PWMOUT_UNKNOWN       0
+#define CXD56_ACA_SP_DELAY_SEL_UNKNOWN 0
+#define CXD56_ACA_SP_LOOP_MODE_UNKNOWN 0
+#define CXD56_ACA_SP_DLY_FREE_UNKNOWN  0
+
+#define CXD56_AUDAT_SEL_BUSIF1 4
+#define CXD56_AUDAT_SEL_BUSIF2 4
+
+#define CXD56_DMA_MSTATE_BUF_EMPTY  3
+#define CXD56_DMA_TIMEOUT           10000
+#define CXD56_DMA_START_RETRY_CNT   10
+#define CXD56_DMA_SMP_WAIT_HIRES    10 /* usec per sample. */
+#define CXD56_DMA_SMP_WAIT_NORMALT  40 /* usec per sample. */
+#define CXD56_DMA_CMD_FIFO_NOT_FULL 1
+#define CXD56_DMA_START_ADDR_MASK   0x3fffffff
+
+/* Queue extensions */
+
+#define dq_push(q,n) (dq_addlast((dq_entry_t*)n,(q)))
+#define dq_pop(q)    (dq_remfirst(q))
+#define dq_clear(q) \
+  do \
+    { \
+      dq_remlast(q); \
+    } \
+  while (!dq_empty(q))
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/* Located in arch/arm/src/cxd56xx/cxd56_clock.c */
+
+extern void cxd56_audio_clock_enable(uint32_t clk, uint32_t div);
+extern void cxd56_audio_clock_disable(void);
+extern bool cxd56_audio_clock_is_enabled(void);
+
+/* Located in arch/arm/src/cxd56xx/cxd56_farapistub.S */
+
+extern uint32_t as_aca_control(uint8_t type, uint32_t param);
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+/* CXD56 Audio register value definition */
+
+struct cxd56_aureg_s
+{
+  uint32_t addr;
+  uint8_t  pos;
+  uint8_t  len;
+};
+typedef struct cxd56_aureg_s cxd56_aureg_t;
+
+/* DMA interrupt types */
+
+enum cxd56_dma_int_e
+{
+  CXD56_DMA_INT_DONE = 0x01,
+  CXD56_DMA_INT_ERR  = 0x02,
+  CXD56_DMA_INT_SMP  = 0x10,
+  CXD56_DMA_INT_CMB  = 0x20
+};
+
+/* Volume setting IDs */
+
+enum cxd56_vol_id_e
+{
+  CXD56_VOL_ID_MIXER_IN1,  /* SDIN1_VOL */
+  CXD56_VOL_ID_MIXER_IN2,  /* SDIN2_VOL */
+  CXD56_VOL_ID_MIXER_OUT   /* DAC_VOL */
+};
+
+struct cxd56_aca_pwon_param_s
+{
+  uint8_t osc_mode;
+  uint8_t mic_dev;
+  uint8_t gpo_ds;
+  uint8_t ad_data_ds;
+  uint8_t dmic_clk_ds;
+  uint8_t mclk_ds;
+};
+
+struct cxd56_aca_smaster_param_s
+{
+  uint8_t mode;
+  uint8_t mck_fs;
+  uint8_t pwm_mode;
+  uint8_t ch_sel;
+  uint8_t out2dly;
+};
+
+struct cxd56_aca_pwoutput_param_s
+{
+  uint8_t out_dev;
+  uint8_t pwm_out[2];
+  uint8_t sp_delay;
+  uint8_t loop_mode;
+  uint8_t mode;
+  uint8_t sp_dly_free;
+  uint8_t sp_spliton;
+  uint8_t sp_drv;
+};
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/* Interface functions */
+
+#ifdef CONFIG_AUDIO_MULTI_SESSION
+static int     cxd56_configure(FAR struct audio_lowerhalf_s *lower,
+                 FAR void *session, FAR const struct audio_caps_s *caps);
+static int     cxd56_start(FAR struct audio_lowerhalf_s *lower,
+                 FAR void *session);
+#ifndef CONFIG_AUDIO_EXCLUDE_STOP
+static int     cxd56_stop(FAR struct audio_lowerhalf_s *lower,
+                 FAR void *session);
+#endif  /* CONFIG_AUDIO_EXCLUDE_STOP */
+#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
+static int     cxd56_pause(FAR struct audio_lowerhalf_s *lower,
+                 FAR void *session);
+static int     cxd56_resume(FAR struct audio_lowerhalf_s *lower,
+                 FAR void *session);
+#endif  /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
+static int     cxd56_reserve(FAR struct audio_lowerhalf_s *lower,
+                 FAR void** session);
+static int     cxd56_release(FAR struct audio_lowerhalf_s *lower,
+                 FAR void *session);
+#else
+
+static int     cxd56_configure(FAR struct audio_lowerhalf_s *lower,
+                 FAR const struct audio_caps_s *caps);
+static int     cxd56_start(FAR struct audio_lowerhalf_s *lower);
+#ifndef CONFIG_AUDIO_EXCLUDE_STOP
+static int     cxd56_stop(FAR struct audio_lowerhalf_s *lower);
+#endif  /* CONFIG_AUDIO_EXCLUDE_STOP */
+#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
+static int     cxd56_pause(FAR struct audio_lowerhalf_s *lower);
+static int     cxd56_resume(FAR struct audio_lowerhalf_s *lower);
+#endif  /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
+static int     cxd56_reserve(FAR struct audio_lowerhalf_s *lower);
+static int     cxd56_release(FAR struct audio_lowerhalf_s *lower);
+#endif /* CONFIG_AUDIO_MULTI_SESSION */
+
+static int     cxd56_getcaps(FAR struct audio_lowerhalf_s *lower, int type,
+                 FAR struct audio_caps_s *caps);
+static int     cxd56_shutdown(FAR struct audio_lowerhalf_s *lower);
+static int     cxd56_enqueuebuffer(FAR struct audio_lowerhalf_s *lower,
+                 FAR struct ap_buffer_s *apb);
+static int     cxd56_cancelbuffer(FAR struct audio_lowerhalf_s *lower,
+                 FAR struct ap_buffer_s *apb);
+static int     cxd56_ioctl(FAR struct audio_lowerhalf_s *lower, int cmd,
+                 unsigned long arg);
+
+/* Non-interface functions */
+
+static void cxd56_attach_irq(bool attach);
+static void cxd56_enable_irq(bool enable);
+static uint32_t cxd56_get_i2s_rate(uint32_t samplerate);
+static int cxd56_init_dma(FAR struct cxd56_dev_s *dev);
+static void cxd56_init_i2s1_output(uint8_t bits);
+static int cxd56_init_worker(FAR struct audio_lowerhalf_s *lower);
+static uint32_t cxd56_power_off(FAR struct cxd56_dev_s *dev);
+static uint32_t cxd56_power_on(FAR struct cxd56_dev_s *dev);
+static uint32_t cxd56_power_on_aca(uint32_t samplerate);
+static uint32_t cxd56_power_on_analog_output(FAR struct cxd56_dev_s *dev);
+static void cxd56_power_on_i2s1(FAR struct cxd56_dev_s *dev);
+static int cxd56_start_dma(FAR struct cxd56_dev_s *dev);
+static int cxd56_stop_dma(FAR struct cxd56_dev_s *priv);
+static void cxd56_set_dma_int_en(bool enabled);
+static void cxd56_set_dma_running(cxd56_dmahandle_t handle, bool running);
+static void cxd56_set_volume(enum cxd56_vol_id_e id, int16_t vol, bool fade);
+static void cxd56_swap_buffer_rl(uint32_t addr, uint16_t size);
+static void *cxd56_workerthread(pthread_addr_t pvarg);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static struct cxd56_dev_s *g_dev[CXD56_AUDIO_DMA_COUNT] =
+{
+  NULL
+};
+
+static uint16_t g_codec_start_count = 0;
+
+static const struct audio_ops_s g_audioops =
+{
+  cxd56_getcaps,       /* getcaps        */
+  cxd56_configure,     /* configure      */
+  cxd56_shutdown,      /* shutdown       */
+  cxd56_start,         /* start          */
+#ifndef CONFIG_AUDIO_EXCLUDE_STOP
+  cxd56_stop,          /* stop           */
+#endif
+#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
+  cxd56_pause,         /* pause          */
+  cxd56_resume,        /* resume         */
+#endif
+  NULL,                /* alloc_buffer   */
+  NULL,                /* free_buffer    */
+  cxd56_enqueuebuffer, /* enqueue_buffer */
+  cxd56_cancelbuffer,  /* cancel_buffer  */
+  cxd56_ioctl,         /* ioctl          */
+  NULL,                /* read           */
+  NULL,                /* write          */
+  cxd56_reserve,       /* reserve        */
+  cxd56_release        /* release        */
+};
+
+/* AC registers */
+
+const cxd56_aureg_t  REG_AC_REVID =
+{
+  REG_BASE + 0x0000, 16,  8
+};
+const cxd56_aureg_t  REG_AC_DEVICEID =
+{
+  REG_BASE + 0x0000, 24,  8
+};
+const cxd56_aureg_t  REG_AC_PDN_DSPB =
+{
+  REG_BASE + 0x0100, 16,  1
+};
+const cxd56_aureg_t  REG_AC_PDN_ANC =
+{
+  REG_BASE + 0x0100, 17,  1
+};
+const cxd56_aureg_t  REG_AC_PDN_DNC1 =
+{
+  REG_BASE + 0x0100, 18,  1
+};
+const cxd56_aureg_t  REG_AC_PDN_DNC2 =
+{
+  REG_BASE + 0x0100, 19,  1
+};
+const cxd56_aureg_t  REG_AC_PDN_SMSTR =
+{
+  REG_BASE + 0x0100, 20,  1
+};
+const cxd56_aureg_t  REG_AC_PDN_DSPS1 =
+{
+  REG_BASE + 0x0100, 21,  1
+};
+const cxd56_aureg_t  REG_AC_PDN_DSPS2 =
+{
+  REG_BASE + 0x0100, 22,  1
+};
+const cxd56_aureg_t  REG_AC_PDN_DSPC =
+{
+  REG_BASE + 0x0100, 23,  1
+};
+const cxd56_aureg_t  REG_AC_FS_FS =
+{
+  REG_BASE + 0x0104,  0,  1
+};
+const cxd56_aureg_t  REG_AC_DECIM0 =
+{
+  REG_BASE + 0x0104, 16,  1
+};
+const cxd56_aureg_t  REG_AC_DECIM1 =
+{
+  REG_BASE + 0x0104, 17,  1
+};
+const cxd56_aureg_t  REG_AC_SDES_EN =
+{
+  REG_BASE + 0x0104, 18,  1
+};
+const cxd56_aureg_t  REG_AC_MCK_AMBMSTR_EN =
+{
+  REG_BASE + 0x0104, 19,  1
+};
+const cxd56_aureg_t  REG_AC_AU_DAT_SEL2 =
+{
+  REG_BASE + 0x0108, 16,  3
+};
+const cxd56_aureg_t  REG_AC_AU_DAT_SEL1 =
+{
+  REG_BASE + 0x0108, 20,  3
+};
+const cxd56_aureg_t  REG_AC_AU_COD_INSEL3 =
+{
+  REG_BASE + 0x0108, 24,  2
+};
+const cxd56_aureg_t  REG_AC_AU_COD_INSEL2 =
+{
+  REG_BASE + 0x0108, 26,  2
+};
+const cxd56_aureg_t  REG_AC_DSR_RATE =
+{
+  REG_BASE + 0x0200,  0,  3
+};
+const cxd56_aureg_t  REG_AC_DIGSFT =
+{
+  REG_BASE + 0x0200, 12,  1
+};
+const cxd56_aureg_t  REG_AC_SRC1 =
+{
+  REG_BASE + 0x0200, 16,  2
+};
+const cxd56_aureg_t  REG_AC_SRC1IN_SEL =
+{
+  REG_BASE + 0x0200, 18,  2
+};
+const cxd56_aureg_t  REG_AC_SRC2IN_SEL =
+{
+  REG_BASE + 0x0200, 22,  2
+};
+const cxd56_aureg_t  REG_AC_DIF1 =
+{
+  REG_BASE + 0x0200, 27,  1
+};
+const cxd56_aureg_t  REG_AC_SD1MASTER =
+{
+  REG_BASE + 0x0200, 29,  1
+};
+const cxd56_aureg_t  REG_AC_SDCK_OUTENX =
+{
+  REG_BASE + 0x0200, 30,  1
+};
+const cxd56_aureg_t  REG_AC_SPC_EN =
+{
+  REG_BASE + 0x021c, 15,  1
+};
+const cxd56_aureg_t  REG_AC_ALC_EN =
+{
+  REG_BASE + 0x021c, 31,  1
+};
+const cxd56_aureg_t  REG_AC_CS_VOL =
+{
+  REG_BASE + 0x0228,  0,  7
+};
+const cxd56_aureg_t  REG_AC_CS_SIGN =
+{
+  REG_BASE + 0x0228,  7,  1
+};
+const cxd56_aureg_t  REG_AC_SDIN1_VOL =
+{
+  REG_BASE + 0x0228, 16,  8
+};
+const cxd56_aureg_t  REG_AC_SDIN2_VOL =
+{
+  REG_BASE + 0x0228, 24,  8
+};
+const cxd56_aureg_t  REG_AC_SDIN1_EN =
+{
+  REG_BASE + 0x022c,  0,  1
+};
+const cxd56_aureg_t  REG_AC_SDIN2_EN =
+{
+  REG_BASE + 0x022c,  1,  1
+};
+const cxd56_aureg_t  REG_AC_SDOUT1_EN =
+{
+  REG_BASE + 0x022c,  2,  1
+};
+const cxd56_aureg_t  REG_AC_SDOUT2_EN =
+{
+  REG_BASE + 0x022c,  3,  1
+};
+const cxd56_aureg_t  REG_AC_BLF_EN =
+{
+  REG_BASE + 0x022c,  5,  1
+};
+const cxd56_aureg_t  REG_AC_DAC_VOL =
+{
+  REG_BASE + 0x022c,  8,  8
+};
+const cxd56_aureg_t  REG_AC_DNC2_MUTE =
+{
+  REG_BASE + 0x0304, 22,  1
+};
+const cxd56_aureg_t  REG_AC_DNC2_START =
+{
+  REG_BASE + 0x0304, 23,  1
+};
+const cxd56_aureg_t  REG_AC_DNC1_MUTE =
+{
+  REG_BASE + 0x0304, 30,  1
+};
+const cxd56_aureg_t  REG_AC_DNC1_START =
+{
+  REG_BASE + 0x0304, 31,  1
+};
+const cxd56_aureg_t  REG_AC_NSX2 =
+{
+  REG_BASE + 0x0340, 30,  1
+};
+const cxd56_aureg_t  REG_AC_NSPMUTE =
+{
+  REG_BASE + 0x0340, 31,  1
+};
+const cxd56_aureg_t  REG_AC_NSDD =
+{
+  REG_BASE + 0x0344,  0, 20
+};
+const cxd56_aureg_t  REG_AC_TEST_OUT_SEL0 =
+{
+  REG_BASE + 0x0400,  6,  1
+};
+const cxd56_aureg_t  REG_AC_DSPRAM4_CLR =
+{
+  REG_BASE + 0x0400, 28,  1
+};
+const cxd56_aureg_t  REG_AC_DSPRAM2_CLR =
+{
+  REG_BASE + 0x0400, 29,  1
+};
+const cxd56_aureg_t  REG_AC_DSPRAM1_CLR =
+{
+  REG_BASE + 0x0400, 31,  1
+};
+const cxd56_aureg_t  REG_AC_S_RESET =
+{
+  REG_BASE + 0x0400, 16,  1
+};
+const cxd56_aureg_t  REG_AC_PDM_OUT_EN =
+{
+  REG_BASE + 0x0500, 16,  1
+};
+const cxd56_aureg_t  REG_AC_FS_CLK_EN =
+{
+  REG_BASE + 0x0500, 24,  1
+};
+const cxd56_aureg_t  REG_AC_DEQ_EN =
+{
+  REG_BASE + 0x0600, 31,  1
+};
+const cxd56_aureg_t  REG_AC_LR_SWAP1 =
+{
+  REG_BASE + 0x0678,  0,  1
+};
+
+/* BCA registers */
+
+const cxd56_aureg_t  REG_MIC_RTD_TRG =
+{
+  REG_BASE + 0x1008,  0,  3
+};
+const cxd56_aureg_t  REG_MIC_CH8_SEL =
+{
+  REG_BASE + 0x1010,  0,  4
+};
+const cxd56_aureg_t  REG_MIC_MON_START =
+{
+  REG_BASE + 0x1014,  3,  1
+};
+const cxd56_aureg_t  REG_MIC_MON_ERROR_SET =
+{
+  REG_BASE + 0x1014,  8,  8
+};
+const cxd56_aureg_t  REG_MIC_MON_MONBUF =
+{
+  REG_BASE + 0x1014, 16,  4
+};
+const cxd56_aureg_t  REG_I2S1_OUT_START_ADR =
+{
+  REG_BASE + 0x10c0,  0, 30
+};
+const cxd56_aureg_t  REG_I2S1_OUT_SAMPLE_NO =
+{
+  REG_BASE + 0x10c4,  0, 32
+};
+const cxd56_aureg_t  REG_I2S1_OUT_RTD_TRG =
+{
+  REG_BASE + 0x10c8,  0,  3
+};
+const cxd56_aureg_t  REG_I2S1_OUT_BITWT =
+{
+  REG_BASE + 0x10cc,  0,  1
+};
+const cxd56_aureg_t  REG_I2S1_OUT_SD1_R_SEL =
+{
+  REG_BASE + 0x10d0,  0,  2
+};
+const cxd56_aureg_t  REG_I2S1_OUT_SD1_L_SEL =
+{
+  REG_BASE + 0x10d0,  4,  2
+};
+const cxd56_aureg_t  REG_I2S1_OUT_MON_START =
+{
+  REG_BASE + 0x10d4,  0,  1
+};
+const cxd56_aureg_t  REG_I2S1_OUT_MON_ERRSET =
+{
+  REG_BASE + 0x10d4,  8,  8
+};
+const cxd56_aureg_t  REG_I2S1_OUT_MON_MONBUF =
+{
+  REG_BASE + 0x10d4, 16,  4
+};
+const cxd56_aureg_t  REG_I2S_ENSEL =
+{
+  REG_BASE + 0x1110,  0,  1
+};
+const cxd56_aureg_t  REG_CLK_EN_AHBMSTR_MIC =
+{
+  REG_BASE + 0x11f0,  0,  1
+};
+const cxd56_aureg_t  REG_CLK_EN_AHBMSTR_I2S1 =
+{
+  REG_BASE + 0x11f0,  1,  1
+};
+const cxd56_aureg_t  REG_MIC_INT_CTRL_DONE =
+{
+  REG_BASE + 0x1140,  0,  1
+};
+const cxd56_aureg_t  REG_MIC_INT_CTRL_ERR =
+{
+  REG_BASE + 0x1140,  1,  1
+};
+const cxd56_aureg_t  REG_MIC_INT_CTRL_CMB =
+{
+  REG_BASE + 0x1140,  3,  1
+};
+const cxd56_aureg_t  REG_I2S1_INT_CTRL_DONE =
+{
+  REG_BASE + 0x1144,  0,  1
+};
+const cxd56_aureg_t  REG_I2S1_INT_CTRL_ERR =
+{
+  REG_BASE + 0x1144,  1,  1
+};
+const cxd56_aureg_t  REG_I2S1_INT_CTRL_SMP =
+{
+  REG_BASE + 0x1144,  4,  1
+};
+const cxd56_aureg_t  REG_I2S1_INT_CTRL_CMB =
+{
+  REG_BASE + 0x1144,  5,  1
+};
+const cxd56_aureg_t  REG_MIC_INT_MASK_DONE =
+{
+  REG_BASE + 0x114c,  0,  1
+};
+const cxd56_aureg_t  REG_MIC_INT_MASK_ERR =
+{
+  REG_BASE + 0x114c,  1,  1
+};
+const cxd56_aureg_t  REG_MIC_INT_MASK_CMB =
+{
+  REG_BASE + 0x114c,  3,  1
+};
+const cxd56_aureg_t  REG_I2S1_INT_MASK_DONE =
+{
+  REG_BASE + 0x1150,  0,  1
+};
+const cxd56_aureg_t  REG_I2S1_INT_MASK_ERR =
+{
+  REG_BASE + 0x1150,  1,  1
+};
+const cxd56_aureg_t  REG_I2S1_INT_MASK_SMP =
+{
+  REG_BASE + 0x1150,  4,  1
+};
+const cxd56_aureg_t  REG_I2S1_INT_MASK_CMB =
+{
+  REG_BASE + 0x1150,  5,  1
+};
+const cxd56_aureg_t  REG_INT_M_I2S1_BCL_ERR1 =
+{
+  REG_BASE + 0x1158,  8,  1
+};
+const cxd56_aureg_t  REG_INT_M_I2S1_BCL_ERR2 =
+{
+  REG_BASE + 0x1158,  9,  1
+};
+const cxd56_aureg_t  REG_INT_M_OVF_SMASL =
+{
+  REG_BASE + 0x1158, 17,  1
+};
+const cxd56_aureg_t  REG_INT_M_OVF_SMASR =
+{
+  REG_BASE + 0x1158, 18,  1
+};
+const cxd56_aureg_t  REG_INT_HRESP_ERR =
+{
+  REG_BASE + 0x1160,  0,  1
+};
+const cxd56_aureg_t  REG_AHB_MASTER_MIC_MASK =
+{
+  REG_BASE + 0x1730,  0, 32
+};
+const cxd56_aureg_t  REG_AHB_MASTER_I2S1_MASK =
+{
+  REG_BASE + 0x1f30,  0, 32
+};
+
+/* Interrupt registers */
+
+const cxd56_aureg_t  REG_INT_IRQ1 =
+{
+  REG_BASE_INT + 0x30 + 3 * 4, 0, 32
+};
+const cxd56_aureg_t  REG_INT_EN1 =
+{
+  REG_BASE_INT + 0x10 + 3 * 4, 0, 32
+};
+const cxd56_aureg_t  REG_INT_EN1_BITS =
+{
+  REG_BASE_INT + 0x10 + 3 * 4, 6,  4
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static uint32_t read_reg_addr(const cxd56_aureg_t *reg)
+{
+  uint32_t mask;
+
+  mask = CXD56_GEN_MASK(reg->len, reg->pos);
+  return (*((volatile uint32_t *)reg->addr) & mask) >> reg->pos;
+}
+
+static void write_reg_addr(const cxd56_aureg_t *reg, uint32_t val)
+{
+  uint32_t mask;
+  uint32_t curr;
+
+  mask = CXD56_GEN_MASK(reg->len, reg->pos);
+  curr = *((volatile uint32_t *)reg->addr) & ~mask;
+  *((volatile uint32_t *)reg->addr) = curr | ((val << reg->pos) & mask);
+}
+
+#define read_reg(reg)         (read_reg_addr(&(reg)))
+#define read_reg32(reg)       (*((volatile uint32_t *)(reg).addr))
+#define write_reg(reg, val)   (write_reg_addr(&(reg), (val)))
+#define write_reg32(reg, val) (*((volatile uint32_t *)(reg).addr) = (val))
+
+/* Aquire semaphore */
+
+static void cxd56_take_sem(sem_t *sem)
+{
+  int ret;
+
+  do
+    {
+      ret = nxsem_wait(sem);
+      if (ret != 0 && ret != -EINTR)
+        {
+          auderr("cxd56_take_sem failed. (%d)\n", ret);
+        }
+    }
+  while (ret == -EINTR);
+}
+
+/* Release semaphore */
+
+static void cxd56_give_sem(sem_t *sem)
+{
+  int ret;
+
+  do
+    {
+      ret = nxsem_post(sem);
+      if (ret != 0 && ret != -EINTR)
+        {
+          auderr("cxd56_give_sem failed. (%d)\n", ret);
+        }
+    }
+  while (ret == -EINTR);
+}
+
+static void cxd56_int_clear(cxd56_dmahandle_t handle, uint8_t intbits)
+{
+  if (handle == CXD56_AUDIO_DMA_I2S0_DOWN)
+    {
+      write_reg32(REG_I2S1_INT_CTRL_DONE, intbits);
+    }
+}
+
+static void cxd56_int_mask(cxd56_dmahandle_t handle, uint8_t intbits)
+{
+  if (handle == CXD56_AUDIO_DMA_I2S0_DOWN)
+    {
+      intbits |= read_reg32(REG_I2S1_INT_MASK_DONE);
+      write_reg32(REG_I2S1_INT_MASK_DONE, intbits);
+    }
+}
+
+static void cxd56_int_unmask(cxd56_dmahandle_t handle, uint8_t intbits)
+{
+  uint32_t curr;
+
+  if (handle == CXD56_AUDIO_DMA_I2S0_DOWN)
+    {
+      curr = read_reg32(REG_I2S1_INT_MASK_DONE);
+      write_reg32(REG_I2S1_INT_MASK_DONE, curr & ~intbits);
+    }
+}
+
+static void cxd56_int_unmask_ahb(cxd56_dmahandle_t handle)
+{
+  if (handle == CXD56_AUDIO_DMA_I2S0_DOWN)
+    {
+      write_reg32(REG_AHB_MASTER_I2S1_MASK, 0x00000202);
+    }
+}
+
+static uint32_t cxd56_int_get_state(cxd56_dmahandle_t handle)
+{
+  if (handle == CXD56_AUDIO_DMA_I2S0_DOWN)
+    {
+      return (0x3f & read_reg32(REG_I2S1_INT_CTRL_DONE)
+              & ~(read_reg32(REG_I2S1_INT_MASK_DONE)));
+    }
+
+  return 0;
+}
+
+static uint8_t cxd56_get_monbuf_state(cxd56_dmahandle_t handle)
+{
+  if (handle == CXD56_AUDIO_DMA_I2S0_DOWN)
+    {
+      return read_reg(REG_I2S1_OUT_MON_MONBUF);
+    }
+
+  return 0;
+}
+
+static void cxd56_reset_channel_sel(cxd56_dmahandle_t handle)
+{
+  uint32_t sel;
+
+  if (handle == CXD56_AUDIO_DMA_I2S0_DOWN)
+    {
+      sel = read_reg32(REG_I2S1_OUT_SD1_R_SEL);
+      write_reg32(REG_I2S1_OUT_SD1_R_SEL, 0xffffffff);
+      write_reg32(REG_I2S1_OUT_SD1_R_SEL, sel);
+    }
+}
+
+static void cxd56_dma_int_handler(void)
+{
+  uint16_t          ecode = CXD56_AUDIO_ECODE_DMA_HANDLE_INV;
+  cxd56_dmahandle_t hdl;
+
+  uint32_t int_irq = read_reg32(REG_INT_IRQ1);
+  uint32_t int_i2s = cxd56_int_get_state(CXD56_AUDIO_DMA_I2S0_DOWN);
+
+  if ((int_irq & CXD56_IRQ1_BIT_I2S1) && (int_i2s != 0))
+    {
+      hdl = CXD56_AUDIO_DMA_I2S0_DOWN;
+
+      write_reg32(REG_I2S1_INT_CTRL_DONE, int_i2s);
+
+      if (int_i2s & (1 << REG_I2S1_INT_CTRL_DONE.pos))
+        {
+          ecode = CXD56_AUDIO_ECODE_DMA_CMPLT;
+        }
+
+      if (int_i2s & (1 << REG_I2S1_INT_CTRL_ERR.pos))
+        {
+          /* Mask and clear transfer error interrupt */
+
+          write_reg(REG_I2S1_INT_MASK_ERR, 1);
+          write_reg(REG_I2S1_INT_CTRL_ERR, 1);
+
+          ecode = CXD56_AUDIO_ECODE_DMA_TRANS;
+        }
+
+      if (int_i2s & (1 << REG_I2S1_INT_CTRL_CMB.pos))
+        {
+          /* Mask and clear bus error interrupt */
+
+          write_reg(REG_I2S1_INT_MASK_CMB, 1);
+          write_reg(REG_I2S1_INT_CTRL_CMB, 1);
+
+          ecode = CXD56_AUDIO_ECODE_DMA_CMB;
+        }
+    }
+  else
+    {
+      _warn("cxd56_dma_int_handler: Unhandled interrupt\n");
+      return;
+    }
+
+  if (ecode != CXD56_AUDIO_ECODE_DMA_HANDLE_INV)
+    {
+      struct audio_msg_s msg;
+      struct cxd56_dev_s *dev;
+
+      dev = g_dev[hdl];
+
+      /* Trigger new DMA job */
+
+      cxd56_take_sem(&dev->pendsem);
+      if (dq_count(&dev->runningq) > 0)
+        {
+          FAR struct ap_buffer_s *apb;
+          apb = (struct ap_buffer_s *) dq_pop(&dev->runningq);
+          dev->dev.upper(dev->dev.priv, AUDIO_CALLBACK_DEQUEUE, apb, OK);
+        }
+
+      cxd56_give_sem(&dev->pendsem);
+
+      if (dev->mq != NULL)
+        {
+          msg.msgId = AUDIO_MSG_DATA_REQUEST;
+          msg.u.data = 0;
+          (void)nxmq_send(dev->mq, (FAR const char *) &msg,
+                          sizeof(msg), CONFIG_CXD56_MSG_PRIO);
+        }
+
+      if (ecode == CXD56_AUDIO_ECODE_DMA_TRANS)
+        {
+          /* End of data */
+
+          msg.msgId = AUDIO_MSG_STOP;
+          msg.u.data = 0;
+          (void)nxmq_send(dev->mq, (FAR const char *)&msg,
+                          sizeof(msg), CONFIG_CXD56_MSG_PRIO);
+        }
+    }
+}
+
+static void cxd56_attach_irq(bool attach)
+{
+  if (attach)
+    {
+      irq_attach(CXD56_IRQ_AUDIO_0, (xcpt_t)cxd56_dma_int_handler, NULL);
+      irq_attach(CXD56_IRQ_AUDIO_1, (xcpt_t)cxd56_dma_int_handler, NULL);
+      irq_attach(CXD56_IRQ_AUDIO_2, (xcpt_t)cxd56_dma_int_handler, NULL);
+      irq_attach(CXD56_IRQ_AUDIO_3, (xcpt_t)cxd56_dma_int_handler, NULL);
+    }
+  else
+    {
+      irq_detach(CXD56_IRQ_AUDIO_0);
+      irq_detach(CXD56_IRQ_AUDIO_1);
+      irq_detach(CXD56_IRQ_AUDIO_2);
+      irq_detach(CXD56_IRQ_AUDIO_3);
+    }
+}
+
+static void cxd56_enable_irq(bool enable)
+{
+  if (enable)
+    {
+      up_enable_irq(CXD56_IRQ_AUDIO_0);
+      up_enable_irq(CXD56_IRQ_AUDIO_1);
+      up_enable_irq(CXD56_IRQ_AUDIO_2);
+    }
+  else
+    {
+      up_disable_irq(CXD56_IRQ_AUDIO_0);
+      up_disable_irq(CXD56_IRQ_AUDIO_1);
+      up_disable_irq(CXD56_IRQ_AUDIO_2);
+    }
+}
+
+static void cxd56_set_volume(enum cxd56_vol_id_e id, int16_t vol, bool fade)
+{
+  uint32_t waittime = 0;
+
+  if (vol == CXD56_VOL_MUTE)
+    {
+      vol = CXD56_VOL_MUTE_REG;
+    }
+  else
+    {
+      CXD56_AUDIO_ECODE ret;
+
+      vol = CXD56_VOL_TO_REG(vol);
+
+      /* Enable analog out */
+
+      ret = as_aca_control(CXD56_ACA_CTL_SET_OUTPUT_DEVICE,
+                           (uint32_t)CXD56_OUT_DEV_SP);
+      if (ret != CXD56_AUDIO_ECODE_OK)
+        {
+          auderr("cxd56_set_volume analog out enable failed. (%d)\n", ret);
+        }
+    }
+
+  switch (id)
+  {
+    case CXD56_VOL_ID_MIXER_IN1:
+      write_reg(REG_AC_SDIN1_VOL, vol);
+      break;
+    case CXD56_VOL_ID_MIXER_IN2:
+      write_reg(REG_AC_SDIN2_VOL, vol);
+      break;
+    case CXD56_VOL_ID_MIXER_OUT:
+      write_reg(REG_AC_DAC_VOL, vol);
+      break;
+  }
+
+  waittime = (fade ? CXD56_VOL_MUTE_TIME(vol, 1) : CXD56_VOL_WAIT_TIME);
+
+  nxsig_usleep(waittime);
+
+  if (vol == CXD56_VOL_MUTE_REG)
+  {
+    /* Disable analog out */
+
+    as_aca_control(CXD56_ACA_CTL_SET_OUTPUT_DEVICE,
+                   (uint32_t)CXD56_OUT_DEV_OFF);
+  }
+}
+
+static void cxd56_init_i2s1_output(uint8_t bits)
+{
+  write_reg(REG_I2S1_OUT_SD1_L_SEL, 1);
+  write_reg(REG_I2S1_OUT_SD1_R_SEL, 0);
+  write_reg(REG_I2S1_OUT_BITWT, (bits == 16));
+  write_reg(REG_CLK_EN_AHBMSTR_I2S1, 1);
+  write_reg(REG_I2S1_OUT_START_ADR, 0);
+  write_reg(REG_I2S1_OUT_SAMPLE_NO, 0);
+}
+
+static void cxd56_set_dma_int_en(bool enabled)
+{
+  if (enabled)
+    {
+      write_reg(REG_INT_EN1_BITS, 0xf);
+      write_reg(REG_INT_HRESP_ERR, 1);
+    }
+  else
+    {
+      write_reg32(REG_INT_EN1_BITS, 0x0);
+      write_reg32(REG_INT_HRESP_ERR, 0);
+    }
+}
+
+static void cxd56_set_dma_running(cxd56_dmahandle_t handle, bool running)
+{
+  if (handle == CXD56_AUDIO_DMA_I2S0_DOWN)
+    {
+      write_reg(REG_I2S1_OUT_RTD_TRG, (running ? 0x01 : 0x04));
+    }
+}
+
+static int cxd56_init_dma(FAR struct cxd56_dev_s *dev)
+{
+  int ret = CXD56_AUDIO_ECODE_OK;
+  FAR struct cxd56_dev_s *priv = (FAR struct cxd56_dev_s *)dev;
+  uint8_t ints = CXD56_DMA_INT_DONE | CXD56_DMA_INT_ERR | CXD56_DMA_INT_CMB;
+
+  audinfo("cxd56_init_dma: state = %d, hdl = %d.\n",
+          dev->state,
+          dev->dma_handle);
+
+  dq_clear(&dev->pendingq);
+  dq_clear(&dev->runningq);
+
+  /* Enable DMA */
+
+  write_reg(REG_AC_MCK_AMBMSTR_EN, 1);
+
+  /* Setup output, bit width etc */
+
+  cxd56_init_i2s1_output(priv->bitwidth);
+
+  /* Clear interrupt states */
+
+  cxd56_int_clear(dev->dma_handle, ints);
+
+  /* Enable interrupts */
+
+  cxd56_int_unmask(dev->dma_handle, ints);
+  cxd56_int_unmask_ahb(dev->dma_handle);
+
+  cxd56_set_dma_int_en(true);
+
+  return ret;
+}
+
+static uint32_t cxd56_get_i2s_rate(uint32_t samplerate)
+{
+  if (samplerate <= 48000)
+    {
+      return 1;   /* low */
+    }
+  else if (samplerate <= 96000)
+    {
+      return 2;   /* medium */
+    }
+
+  return 3;       /* high */
+}
+
+static void cxd56_power_on_i2s1(FAR struct cxd56_dev_s *dev)
+{
+  uint32_t rate;
+  write_reg(REG_AC_PDN_DSPS1, 0);                     /* Power on SRC1 */
+  write_reg(REG_AC_SD1MASTER, CXD56_I2S1_MODE);       /* I2S1 mode */
+  write_reg(REG_AC_DIF1, CXD56_I2S1_FORMAT);          /* I2S1 format */
+  write_reg(REG_AC_LR_SWAP1, CXD56_I2S1_FORMAT);
+  write_reg(REG_AC_TEST_OUT_SEL0, CXD56_I2S1_BYPASS); /* I2S1 bypass mode */
+
+  rate = cxd56_get_i2s_rate(CXD56_I2S1_DATA_RATE);
+  write_reg(REG_AC_SRC1, rate);                       /* I2S1 rate */
+}
+
+static uint32_t cxd56_power_on_aca(uint32_t samplerate)
+{
+  struct cxd56_aca_pwon_param_s pwon_param;
+
+  if (as_aca_control(CXD56_ACA_CTL_CHECK_ID, (uint32_t)NULL) != 0)
+    {
+      return CXD56_AUDIO_ECODE_ANA_CHKID;
+    }
+
+  if (samplerate > 48000)
+    {
+      pwon_param.osc_mode = (CXD56_AUDIO_MCLK == CXD56_XTAL_24_576MHZ ?
+                             CXD56_ACA_OSC_24_576MHZ_HIRES :
+                             CXD56_ACA_OSC_49_152MHZ_HIRES);
+    }
+  else
+    {
+      pwon_param.osc_mode = (CXD56_AUDIO_MCLK == CXD56_XTAL_24_576MHZ ?
+                             CXD56_ACA_OSC_24_576MHZ :
+                             CXD56_ACA_OSC_49_152MHZ);
+    }
+
+  pwon_param.dmic_clk_ds = CXD56_DMIC_CLK_DS;
+  pwon_param.ad_data_ds = CXD56_DA_DS;
+  pwon_param.mic_dev = CXD56_ACA_MIC_AMIC;  /* TODO: analog/digital mic select */
+  pwon_param.mclk_ds = CXD56_MCLKOUT_DS;
+  pwon_param.gpo_ds = CXD56_GPO_A_DS;
+  if (as_aca_control(CXD56_ACA_CTL_POWER_ON_COMMON,
+                    (uint32_t)&pwon_param) != 0)
+    {
+      return CXD56_AUDIO_ECODE_ANA_PWON;
+    }
+
+  return CXD56_AUDIO_ECODE_OK;
+}
+
+static uint32_t cxd56_power_on_analog_output(FAR struct cxd56_dev_s *dev)
+{
+  struct cxd56_aca_smaster_param_s smaster_param;
+  struct cxd56_aca_pwoutput_param_s pwon_param;
+
+  if (dev->samplerate > 48000)
+    {
+      smaster_param.mode   = CXD56_SMSTR_MODE_FS_32;
+      smaster_param.mck_fs = CXD56_SMSTR_MCK_FS_1024;
+      pwon_param.mode      = CXD56_SMSTR_MODE_FS_32;
+    }
+  else
+    {
+      smaster_param.mode   = CXD56_SMSTR_MODE_FS_16;
+      smaster_param.mck_fs = CXD56_SMSTR_MCK_FS_512;
+      pwon_param.mode      = CXD56_SMSTR_MODE_FS_16;
+    }
+
+  smaster_param.ch_sel   = CXD56_SMSTR_CHSEL_NORMAL;
+  smaster_param.out2dly  = 0x00;
+  smaster_param.pwm_mode = CXD56_SMSTR_PWMMD_BOTH;
+
+  pwon_param.out_dev     = CXD56_ACA_OUT_OFF;
+  pwon_param.pwm_out[0]  = CXD56_ACA_PWMOUT_UNKNOWN;
+  pwon_param.pwm_out[1]  = CXD56_ACA_PWMOUT_UNKNOWN;
+  pwon_param.sp_delay    = CXD56_ACA_SP_DELAY_SEL_UNKNOWN;
+  pwon_param.loop_mode   = CXD56_ACA_SP_LOOP_MODE_UNKNOWN;
+  pwon_param.sp_dly_free = CXD56_ACA_SP_DLY_FREE_UNKNOWN;
+  pwon_param.sp_spliton  = CXD56_SP_SPLIT_ON;
+  pwon_param.sp_drv      = CXD56_SP_DRIVER;
+
+  if (as_aca_control(CXD56_ACA_CTL_SET_SMASTER,
+                    (uint32_t)&smaster_param) != 0)
+    {
+      return CXD56_AUDIO_ECODE_ANA_SET_SMASTER;
+    }
+
+  if (as_aca_control(CXD56_ACA_CTL_POWER_ON_OUTPUT,
+                    (uint32_t)&pwon_param) != 0)
+    {
+      return CXD56_AUDIO_ECODE_ANA_PWON_OUTPUT;
+    }
+
+  /* Power on S-Mster. */
+
+  write_reg(REG_AC_PDN_SMSTR, 0);
+
+  /* Set NSDD. */
+
+  write_reg(REG_AC_NSDD, 0x07fb5);
+
+  /* Set NSX2. */
+
+  if (dev->samplerate > 48000 && CXD56_AUDIO_MCLK == CXD56_XTAL_49_152MHZ)
+    {
+      write_reg(REG_AC_NSX2, 1);
+    }
+  else
+    {
+      write_reg(REG_AC_NSX2, 0);
+    }
+
+  /* Set smaster and enable */
+
+  write_reg(REG_INT_M_OVF_SMASL, 0);
+  write_reg(REG_INT_M_OVF_SMASR, 0);
+  write_reg(REG_AC_NSPMUTE, 0);
+
+  cxd56_set_volume(CXD56_AUDIO_VOLID_MIXER_OUT, dev->volume, true);
+
+  return CXD56_AUDIO_ECODE_OK;
+}
+
+static uint32_t cxd56_power_on(FAR struct cxd56_dev_s *dev)
+{
+  if (g_codec_start_count == 0)
+    {
+      board_audio_i2s_enable();
+      board_audio_initialize();
+
+      /* Power on analog audio */
+
+      if (board_aca_power_control(CXD5247_AVDD | CXD5247_DVDD, true) != 0)
+        {
+          return CXD56_AUDIO_ECODE_ANA_PWON;
+        }
+
+      if (!board_aca_power_monitor(CXD5247_AVDD | CXD5247_DVDD))
+        {
+          return CXD56_AUDIO_ECODE_ANA_PWON;
+        }
+
+      cxd56_power_on_aca(dev->samplerate);
+
+      cxd56_audio_clock_enable(CXD56_AUD_MCLK_EXT, 0);
+
+      /* Power_on_codec */
+
+      if (read_reg(REG_AC_REVID) != CXD56_EXP_REVID)
+        {
+          auderr("cxd56_power_on REVID mismatch (%x vs. %x).\n",
+               REG_AC_REVID, CXD56_EXP_REVID);
+          return CXD56_AUDIO_ECODE_ANA_CHKID;
+        }
+
+      if (read_reg(REG_AC_DEVICEID) != CXD56_EXP_DEVICEID)
+        {
+          auderr("cxd56_power_on DEVICEID mismatch (%x vs. %x).\n",
+               REG_AC_DEVICEID, CXD56_EXP_DEVICEID);
+          return CXD56_AUDIO_ECODE_ANA_CHKID;
+        }
+
+      /* Power on serializeer */
+
+      write_reg(REG_AC_SDES_EN, 1);
+
+      /* Power on codec */
+
+      write_reg(REG_AC_PDN_DSPC, 0);
+      write_reg(REG_AC_DSR_RATE, 1);
+      write_reg(REG_AC_DIGSFT,   1);
+
+#if defined(CONFIG_CXD56_I2S0) || defined(CONFIG_CXD56_I2S1)
+      /* Clear interrupt status of bck_err */
+
+      write_reg(REG_INT_M_I2S1_BCL_ERR1, 0);
+      write_reg(REG_INT_M_I2S1_BCL_ERR2, 0);
+
+      cxd56_power_on_i2s1(dev);
+#endif /* defined(CONFIG_CXD56_I2S0) || defined(CONFIG_CXD56_I2S1) */
+
+#ifdef CONFIG_CXD56_I2S0
+      /* Enable I2S data input and output of SRC1 */
+
+      write_reg(REG_AC_SDIN1_EN, 1);
+      write_reg(REG_AC_SDOUT1_EN, 1);
+#endif /* CONFIG_CXD56_I2S0 */
+
+      /* Enable BCK, LRCK output if master (1). */
+
+      write_reg(REG_AC_SDCK_OUTENX, CXD56_I2S1_MODE);
+
+      /* Enable serial interface */
+
+      write_reg(REG_AC_FS_CLK_EN,  1);
+      write_reg(REG_AC_PDM_OUT_EN, 1);
+
+      /* Initialize data path selection */
+
+      write_reg(REG_AC_AU_DAT_SEL1, 4);
+      write_reg(REG_AC_AU_DAT_SEL2, 4);
+      write_reg(REG_AC_AU_COD_INSEL2,  2);
+      write_reg(REG_AC_AU_COD_INSEL3,  3);
+      write_reg(REG_AC_SRC1IN_SEL,  0);
+      write_reg(REG_AC_SRC2IN_SEL,  1);
+
+      /* Set BCA data rate */
+
+      write_reg(REG_I2S_ENSEL, (dev->samplerate > 48000) ? 1 : 0);
+
+      /* TODO: alc, cstereo, dnc, deq, vol & datapath (reset mic */
+
+      cxd56_attach_irq(true);
+      cxd56_enable_irq(true);
+    }
+
+  g_codec_start_count++;
+  dev->state = CXD56_DEV_STATE_STOPPED;
+
+  return CXD56_AUDIO_ECODE_OK;
+}
+
+static uint32_t cxd56_power_off(FAR struct cxd56_dev_s *dev)
+{
+  audinfo("cxd56_power_off\n");
+
+  /* Codec block. */
+
+  /* Disable AHBMASTER. */
+
+  write_reg(REG_AC_MCK_AMBMSTR_EN, 0);
+
+  /* Disable CODEC. */
+
+  write_reg(REG_AC_ALC_EN, 0);
+  write_reg(REG_AC_SPC_EN, 0);
+  write_reg(REG_AC_DEQ_EN, 0);
+
+  /* Disable DNC. */
+
+  write_reg(REG_AC_DNC1_MUTE, 1);
+  write_reg(REG_AC_DNC2_MUTE, 1);
+  write_reg(REG_AC_DNC1_START, 0);
+  write_reg(REG_AC_DNC2_START, 0);
+
+  /* Disable SRC. */
+
+  write_reg(REG_AC_SDIN1_EN, 0);
+  write_reg(REG_AC_SDIN2_EN, 0);
+  write_reg(REG_AC_SDOUT1_EN, 0);
+  write_reg(REG_AC_SDOUT2_EN, 0);
+  write_reg(REG_AC_SDCK_OUTENX, 1);
+  write_reg(REG_AC_BLF_EN, 0);
+
+  /* Disable SDES. */
+
+  write_reg(REG_AC_PDM_OUT_EN, 0);
+  write_reg(REG_AC_FS_CLK_EN, 0);
+  write_reg(REG_AC_SDES_EN, 0);
+
+  /* Power off SRC. */
+
+  write_reg(REG_AC_PDN_DSPS1, 1);
+  write_reg(REG_AC_PDN_DSPS2, 1);
+  write_reg(REG_AC_PDN_DSPB, 1);
+
+  /* Power off CODEC. */
+
+  write_reg(REG_AC_PDN_DSPC, 1);
+
+  /* Power off DNC. */
+
+  write_reg(REG_AC_PDN_DNC1, 1);
+  write_reg(REG_AC_PDN_DNC2, 1);
+  write_reg(REG_AC_PDN_ANC, 1);
+
+  /* Analog block. */
+
+  /* Disable audio clock */
+
+  cxd56_audio_clock_disable();
+  if (as_aca_control(CXD56_ACA_CTL_POWER_OFF_COMMON, (uint32_t)NULL) != 0)
+    {
+      return CXD56_AUDIO_ECODE_ANA_PWOFF;
+    }
+
+  board_aca_power_control(CXD5247_AVDD | CXD5247_DVDD, false);
+
+  /* Disable interrupts */
+
+  cxd56_attach_irq(false);
+  cxd56_enable_irq(false);
+
+  board_audio_finalize();
+
+  return CXD56_AUDIO_ECODE_OK;
+}
+
+/****************************************************************************
+ * Name: cxd56_getcaps
+ *
+ * Description: Get the audio device capabilities.
+ *
+ ****************************************************************************/
+
+static int cxd56_getcaps(FAR struct audio_lowerhalf_s *lower, int type,
+                 FAR struct audio_caps_s *caps)
+{
+  DEBUGASSERT(caps && caps->ac_len >= sizeof(struct audio_caps_s));
+
+  /* Fill in the caller's structure based on requested info */
+
+  caps->ac_format.hw  = 0;
+  caps->ac_controls.w = 0;
+
+  switch (caps->ac_type)
+    {
+      /* Query for supported types of units */
+
+      case AUDIO_TYPE_QUERY:
+
+        /* Stereo output */
+
+        caps->ac_channels = 2;
+
+        switch (caps->ac_subtype)
+          {
+            case AUDIO_TYPE_QUERY:
+
+              /* The types of audio units we implement */
+
+              caps->ac_controls.b[0] = AUDIO_TYPE_OUTPUT |
+                                       AUDIO_TYPE_INPUT |
+                                       AUDIO_TYPE_FEATURE;
+              break;
+
+            default:
+              caps->ac_controls.b[0] = AUDIO_SUBFMT_END;
+              break;
+          }
+        break;
+
+      /* Output capabilities */
+
+      case AUDIO_TYPE_OUTPUT:
+
+        caps->ac_channels = CXD56_OUT_CHANNELS_MAX;
+
+        switch (caps->ac_subtype)
+          {
+            case AUDIO_TYPE_QUERY:
+
+              /* Report supported output sample rates */
+
+              caps->ac_controls.b[0] = CXD56_SUPP_RATES_L;
+              caps->ac_controls.b[1] = CXD56_SUPP_RATES_H;
+              break;
+
+            default:
+              break;
+          }
+        break;
+
+      /* Feature capabilities */
+
+      case AUDIO_TYPE_FEATURE:
+
+        /* Report supported feature units */
+
+        if (caps->ac_subtype == AUDIO_FU_UNDEF)
+          {
+            caps->ac_controls.b[0] = AUDIO_FU_VOLUME;
+          }
+        break;
+
+      /* Others are unsupported */
+
+      default:
+
+        /* Zero out the fields to indicate no support */
+
+        caps->ac_subtype = 0;
+        caps->ac_channels = 0;
+        break;
+    }
+
+  /* Return the length of the audio_caps_s struct for validation */
+
+  return caps->ac_len;
+}
+
+/****************************************************************************
+ * Name: cxd56_shutdown
+ *
+ * Description: Shutdown the chip and puts it in the lowest power
+ *              state possible.
+ *
+ ****************************************************************************/
+
+static int cxd56_shutdown(FAR struct audio_lowerhalf_s *lower)
+{
+  FAR struct cxd56_dev_s *priv = (FAR struct cxd56_dev_s *)lower;
+  int ret = OK;
+
+  audinfo("cxd56_shutdown\n");
+
+  if (priv->state != CXD56_DEV_STATE_OFF)
+    {
+      ret = cxd56_power_off(priv);
+      if (ret != CXD56_AUDIO_ECODE_OK)
+        {
+          auderr("cxd56_audio_poweroff() failed. (%d)\n", ret);
+          goto error;
+        }
+
+      g_codec_start_count = 0;
+      priv->state = CXD56_DEV_STATE_OFF;
+    }
+
+error:
+  return ret;
+}
+
+/****************************************************************************
+ * Name: cxd56_configure
+ *
+ * Description: Configure the audio device for the specified mode.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_AUDIO_MULTI_SESSION
+static int cxd56_configure(FAR struct audio_lowerhalf_s *lower,
+                 FAR void *session, FAR const struct audio_caps_s *caps)
+#else
+static int cxd56_configure(FAR struct audio_lowerhalf_s *lower,
+                 FAR const struct audio_caps_s *caps)
+#endif
+{
+  FAR struct cxd56_dev_s *priv = (FAR struct cxd56_dev_s *)lower;
+  int ret = OK;
+
+  switch (caps->ac_type)
+    {
+    case AUDIO_TYPE_FEATURE:
+      audinfo("  AUDIO_TYPE_FEATURE\n");
+
+      switch (caps->ac_format.hw)
+        {
+#ifndef CONFIG_AUDIO_EXCLUDE_VOLUME
+        case AUDIO_FU_VOLUME:
+          {
+            uint16_t volume = caps->ac_controls.hw[0];
+
+            if (volume >= 0 && volume <= 1000)
+              {
+                /* Scale the volume setting to the range {-1020..120} */
+
+                priv->volume = CXD56_VOL_NX_TO_CXD56(volume);
+                audinfo("Volume: %d (priv = %d)\n", volume, priv->volume);
+
+                cxd56_set_volume(CXD56_AUDIO_VOLID_MIXER_OUT,
+                                 priv->volume, false);
+                cxd56_set_volume(CXD56_AUDIO_VOLID_MIXER_IN1,
+                                 priv->volume, false);
+                cxd56_set_volume(CXD56_AUDIO_VOLID_MIXER_IN2,
+                                 priv->volume, false);
+              }
+            else
+              {
+                ret = -EDOM;
+              }
+          }
+          break;
+#endif /* CONFIG_AUDIO_EXCLUDE_VOLUME */
+
+        default:
+          auderr("Unrecognized feature unit\n");
+          ret = -ENOTTY;
+          break;
+        }
+      break;
+
+    case AUDIO_TYPE_OUTPUT:
+      {
+        if (caps->ac_controls.b[2] != 16 && caps->ac_controls.b[2] != 24)
+          {
+            auderr("Unsupported bits per sample: %d\n",
+                   caps->ac_controls.b[2]);
+            ret = -ERANGE;
+            break;
+          }
+
+        /* Save the configuration */
+
+        priv->dma_handle = CXD56_AUDIO_DMA_I2S0_DOWN;
+        priv->samplerate = caps->ac_controls.hw[0];
+        priv->channels = caps->ac_channels;
+        priv->bitwidth = caps->ac_controls.b[2];
+
+        g_dev[priv->dma_handle] = priv;
+
+        audinfo("Configured output using %d:\n", priv->dma_handle);
+        audinfo("  Channels:    %d\n", priv->channels);
+        audinfo("  Samplerate:  %d\n", priv->samplerate);
+        audinfo("  Bit width:   %d\n", priv->bitwidth);
+
+        ret = cxd56_power_on(priv);
+        if (ret != CXD56_AUDIO_ECODE_OK)
+          {
+            auderr("Power on error. (%d)\n", ret);
+            goto error;
+          }
+
+        ret = cxd56_init_dma(priv);
+        if (ret != CXD56_AUDIO_ECODE_OK)
+          {
+            auderr("DMA init failed. (%d)\n", ret);
+            goto error;
+          }
+
+        ret = cxd56_power_on_analog_output(priv);
+        if (ret != CXD56_AUDIO_ECODE_OK)
+          {
+            auderr("Power on analog output failed- (%d)\n", ret);
+            goto error;
+          }
+      }
+      break;
+    }
+
+error:
+  return ret;
+}
+
+/****************************************************************************
+ * Name: cxd56_start
+ *
+ * Description: Starts playback with the current configuration.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_AUDIO_MULTI_SESSION
+static int cxd56_start(FAR struct audio_lowerhalf_s *lower,
+                       FAR void *session)
+#else
+static int cxd56_start(FAR struct audio_lowerhalf_s *lower)
+#endif
+{
+  int ret;
+  FAR struct cxd56_dev_s *priv = (FAR struct cxd56_dev_s *)lower;
+
+  audinfo("cxd56_start\n");
+
+  /* Select audio data path */
+
+  if (priv->dma_handle == CXD56_AUDIO_DMA_I2S0_DOWN)
+    {
+      write_reg(REG_AC_AU_DAT_SEL1, CXD56_AUDAT_SEL_BUSIF1);
+    }
+
+  ret = cxd56_init_worker(lower);
+  if (ret != CXD56_AUDIO_ECODE_OK)
+    {
+      auderr("Could not feed DMA. (%d)\n", ret);
+      goto error;
+    }
+
+  priv->state = CXD56_DEV_STATE_STARTING;
+
+error:
+  return ret;
+}
+
+/****************************************************************************
+ * Name: cxd56_stop
+ *
+ * Description: Stops playback with the current configuration.
+ *
+ ****************************************************************************/
+
+static int cxd56_stop_dma(FAR struct cxd56_dev_s *priv)
+{
+  int ret = OK;
+
+  if (priv->state != CXD56_DEV_STATE_STOPPED)
+    {
+      audinfo("Stopping DMA for handle %d.\n", priv->dma_handle);
+
+      /* Stop DMA */
+
+      cxd56_set_dma_running(priv->dma_handle, false);
+
+      if (priv->dma_handle == CXD56_AUDIO_DMA_I2S0_DOWN)
+        {
+          /* Turn off amplifier */
+
+          board_external_amp_mute_control(true);
+
+          /* Mute and disable output */
+
+          write_reg(REG_AC_NSPMUTE, 1);
+          write_reg(REG_AC_PDN_SMSTR, 1);
+          as_aca_control(CXD56_ACA_CTL_POWER_OFF_OUTPUT, (uint32_t)NULL);
+        }
+
+      priv->state = CXD56_DEV_STATE_STOPPED;
+    }
+
+  return ret;
+}
+
+#ifndef CONFIG_AUDIO_EXCLUDE_STOP
+#ifdef CONFIG_AUDIO_MULTI_SESSION
+static int cxd56_stop(FAR struct audio_lowerhalf_s *lower, FAR void *session)
+#else
+static int cxd56_stop(FAR struct audio_lowerhalf_s *lower)
+#endif
+{
+  int ret = OK;
+  FAR void *value;
+  struct audio_msg_s msg;
+  FAR struct cxd56_dev_s *priv = (FAR struct cxd56_dev_s *)lower;
+
+  audinfo("cxd56_stop\n");
+
+  if (priv->state == CXD56_DEV_STATE_STOPPED)
+    {
+      goto error;
+    }
+
+  priv->state = CXD56_DEV_STATE_STOPPING;
+
+  msg.msgId = AUDIO_MSG_STOP;
+  msg.u.data = 0;
+  (void)nxmq_send(priv->mq, (FAR const char *)&msg,
+                  sizeof(msg), CONFIG_CXD56_MSG_PRIO);
+
+  /* Join the worker thread */
+
+  pthread_join(priv->threadid, &value);
+  priv->threadid = 0;
+error:
+  return ret;
+}
+#endif /* CONFIG_AUDIO_EXCLUDE_STOP */
+
+/****************************************************************************
+ * Name: cxd56_pause
+ *
+ * Description: Pauses the playback.
+ *
+ ****************************************************************************/
+
+#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
+#ifdef CONFIG_AUDIO_MULTI_SESSION
+static int cxd56_pause(FAR struct audio_lowerhalf_s *lower,
+                       FAR void *session)
+#else
+static int cxd56_pause(FAR struct audio_lowerhalf_s *lower)
+#endif
+{
+  audinfo("cxd56_pause\n");
+  return OK;
+}
+
+/****************************************************************************
+ * Name: cxd56_resume
+ *
+ * Description: Resumes the playback.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_AUDIO_MULTI_SESSION
+static int cxd56_resume(FAR struct audio_lowerhalf_s *lower,
+                        FAR void *session)
+#else
+static int cxd56_resume(FAR struct audio_lowerhalf_s *lower)
+#endif
+{
+  audinfo("cxd56_resume\n");
+  return OK;
+}
+#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
+
+/****************************************************************************
+ * Name: cxd56_release
+ *
+ * Description: Releases the session.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_AUDIO_MULTI_SESSION
+static int cxd56_release(FAR struct audio_lowerhalf_s *lower,
+                  FAR void *pContext)
+#else
+static int cxd56_release(FAR struct audio_lowerhalf_s *lower)
+#endif
+{
+  audinfo("cxd56_release\n");
+  return OK;
+}
+
+/****************************************************************************
+ * Name: cxd56_reserve
+ *
+ * Description: Reserves a session.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_AUDIO_MULTI_SESSION
+static int cxd56_reserve(FAR struct audio_lowerhalf_s *lower,
+                  FAR void **ppContext)
+#else
+static int cxd56_reserve(FAR struct audio_lowerhalf_s *lower)
+#endif
+{
+  audinfo("cxd56_reserve\n");
+  return OK;
+}
+
+static void cxd56_swap_buffer_rl(uint32_t addr, uint16_t size)
+{
+  uint32_t i = 0;
+  uint16_t tmp_buffer;
+  uint16_t *p_lch = (uint16_t *)addr;
+  uint16_t *p_rch = p_lch + 1;
+
+  while (i++ < size / 4)
+    {
+      tmp_buffer = *p_lch;
+      *p_lch = *p_rch;
+      *p_rch = tmp_buffer;
+
+      p_lch += 2;
+      p_rch += 2;
+    }
+}
+
+static int cxd56_start_dma(FAR struct cxd56_dev_s *dev)
+{
+  FAR struct ap_buffer_s *apb;
+  int retry;
+  int timeout;
+  uint32_t addr;
+  uint32_t size;
+  static int bufcount = 0;
+  CXD56_AUDIO_ECODE ret = CXD56_AUDIO_ECODE_OK;
+
+  cxd56_take_sem(&dev->pendsem);
+  if (dq_count(&dev->pendingq) == 0)
+    {
+    audinfo("Pending queue empty! Played %d buffers.\n", bufcount);
+    dev->state = CXD56_DEV_STATE_STOPPING;
+    }
+  else
+    {
+      /* Fill up with as many DMA requests as we can */
+
+      while (dq_count(&dev->pendingq) > 0)
+        {
+          if (read_reg(REG_I2S1_OUT_RTD_TRG) != CXD56_DMA_CMD_FIFO_NOT_FULL)
+            {
+              /* DMA busy, will retry next time */
+
+              ret = CXD56_AUDIO_ECODE_OK;
+              goto exit;
+            }
+
+          apb = (struct ap_buffer_s *) dq_peek(&dev->pendingq);
+          addr = ((uint32_t)apb->samp) & CXD56_DMA_START_ADDR_MASK;
+          size = (apb->nbytes / ((dev->bitwidth / 8) + dev->channels)) - 1;
+
+          if (dev->bitwidth == 16 && CXD56_DMA_FORMAT == CXD56_DMA_FORMAT_RL)
+            {
+              cxd56_swap_buffer_rl((uint32_t)apb->samp, apb->nbytes);
+            }
+
+          write_reg(REG_I2S1_OUT_START_ADR, addr);
+          write_reg(REG_I2S1_OUT_SAMPLE_NO, size);
+
+          /* Start DMA, use workaround with first buffer */
+
+          if (dev->state != CXD56_DEV_STATE_STARTED)
+            {
+              /* Turn on amplifier */
+
+              board_external_amp_mute_control(false);
+
+              /* Mask interrupts */
+
+              cxd56_int_mask(dev->dma_handle, CXD56_DMA_INT_ERR);
+              cxd56_int_mask(dev->dma_handle, CXD56_DMA_INT_DONE);
+
+              /* Sync workaround loop */
+
+              for (retry = 0; retry < CXD56_DMA_START_RETRY_CNT; retry++)
+                {
+                  /* Clear interrupt status */
+
+                  cxd56_int_clear(dev->dma_handle, CXD56_DMA_INT_ERR);
+                  cxd56_int_clear(dev->dma_handle, CXD56_DMA_INT_SMP);
+
+                  /* Lock interrupt */
+
+                  up_irq_disable();
+                  sched_lock();
+
+                  for (timeout = 0; timeout < CXD56_DMA_TIMEOUT; timeout++)
+                    {
+                      if (read_reg(REG_I2S1_INT_CTRL_SMP))
+                        {
+                          break;
+                        }
+                    }
+
+                  if (timeout == CXD56_DMA_TIMEOUT)
+                    {
+                      ret = CXD56_AUDIO_ECODE_DMA_SMP_TIMEOUT;
+                      goto exit;
+                    }
+
+                  /* Reset channel select */
+
+                  cxd56_reset_channel_sel(dev->dma_handle);
+
+                  /* Start DMA */
+
+                  cxd56_set_dma_running(CXD56_AUDIO_DMA_I2S0_DOWN, true);
+
+                  /* Unlock interrupt */
+
+                  sched_unlock();
+                  up_irq_enable();
+
+                  /* Wait for 1sample tramsfer */
+
+                  if (dev->samplerate > 48000)
+                    {
+                      up_udelay(CXD56_DMA_SMP_WAIT_HIRES);
+                    }
+                  else
+                    {
+                      up_udelay(CXD56_DMA_SMP_WAIT_NORMALT);
+                    }
+
+                  /* Check whether an error interrupt has occurred */
+
+                  if (read_reg(REG_I2S1_INT_CTRL_ERR))
+                    {
+                      cxd56_set_dma_running(CXD56_AUDIO_DMA_I2S0_DOWN,
+                                            false);
+                      cxd56_int_clear(dev->dma_handle,
+                                      CXD56_DMA_INT_ERR);
+
+                      for (timeout = 0;
+                           timeout < CXD56_DMA_TIMEOUT;
+                           timeout++)
+                        {
+                          if (CXD56_DMA_MSTATE_BUF_EMPTY ==
+                              cxd56_get_monbuf_state(dev->dma_handle))
+                            {
+                              if (read_reg(REG_I2S1_INT_CTRL_DONE))
+                                {
+                                  cxd56_int_clear(dev->dma_handle,
+                                                  CXD56_DMA_INT_DONE);
+                                  break;
+                                }
+                            }
+                        }
+                    }
+                      else
+                    {
+                      break;
+                    }
+                }
+
+              cxd56_int_unmask(dev->dma_handle, CXD56_DMA_INT_DONE);
+              cxd56_int_clear(dev->dma_handle, CXD56_DMA_INT_ERR);
+              cxd56_int_unmask(dev->dma_handle, CXD56_DMA_INT_ERR);
+            }
+          else
+            {
+              /* start DMA */
+
+              cxd56_set_dma_running(CXD56_AUDIO_DMA_I2S0_DOWN, true);
+            }
+
+          dq_pop(&dev->pendingq);
+          dq_push(&dev->runningq, &apb->dq_entry);
+          dev->state = CXD56_DEV_STATE_STARTED;
+          bufcount++;
+        }
+    }
+
+exit:
+  cxd56_give_sem(&dev->pendsem);
+  return ret;
+}
+
+/****************************************************************************
+ * Name: cxd56_enqueuebuffer
+ *
+ * Description: Enqueue an audio buffer for playback.
+ *
+ ****************************************************************************/
+
+static int cxd56_enqueuebuffer(FAR struct audio_lowerhalf_s *lower,
+                 FAR struct ap_buffer_s *apb)
+{
+  FAR struct cxd56_dev_s *priv = (FAR struct cxd56_dev_s *)lower;
+  struct audio_msg_s msg;
+  int                ret = OK;
+
+  cxd56_take_sem(&priv->pendsem);
+  dq_push(&priv->pendingq, &apb->dq_entry);
+  cxd56_give_sem(&priv->pendsem);
+
+  if (priv->mq != NULL)
+    {
+      msg.msgId = AUDIO_MSG_ENQUEUE;
+      msg.u.data = 0;
+      (void)nxmq_send(priv->mq, (FAR const char *) &msg,
+                      sizeof(msg), CONFIG_CXD56_MSG_PRIO);
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Name: cxd56_cancelbuffer
+ *
+ * Description: Called when an enqueued buffer is being cancelled.
+ *
+ ****************************************************************************/
+
+static int cxd56_cancelbuffer(FAR struct audio_lowerhalf_s *lower,
+                 FAR struct ap_buffer_s *apb)
+{
+  audinfo("cxd56_cancelbuffer\n");
+  return OK;
+}
+
+/****************************************************************************
+ * Name: cxd56_ioctl
+ *
+ * Description: Perform a device ioctl
+ *
+ ****************************************************************************/
+
+static int cxd56_ioctl(FAR struct audio_lowerhalf_s *lower, int cmd,
+                 unsigned long arg)
+{
+#ifdef CONFIG_AUDIO_DRIVER_SPECIFIC_BUFFERS
+  FAR struct ap_buffer_info_s *bufinfo;
+#endif
+
+  audinfo("cxd56_ioctl\n");
+
+  /* Handle ioctl commands from the upper-half driver */
+
+  switch (cmd)
+    {
+       /* Return our preferred buffer size and count */
+
+#ifdef CONFIG_AUDIO_DRIVER_SPECIFIC_BUFFERS
+      case AUDIOIOC_GETBUFFERINFO:
+        {
+          audinfo("AUDIOIOC_GETBUFFERINFO:\n");
+          bufinfo              = (FAR struct ap_buffer_info_s *) arg;
+          bufinfo->buffer_size = CONFIG_CXD56_AUDIO_BUFFER_SIZE;
+          bufinfo->nbuffers    = CONFIG_CXD56_AUDIO_NUM_BUFFERS;
+        }
+        break;
+#endif
+
+      default:
+        audinfo("Unhandled ioctl: %d\n", cmd);
+        break;
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: cxd56_workerthread
+ *
+ *  This is the thread that feeds data to the chip and keeps the audio
+ *  stream going.
+ *
+ ****************************************************************************/
+
+static void *cxd56_workerthread(pthread_addr_t pvarg)
+{
+  FAR struct cxd56_dev_s *priv = (struct cxd56_dev_s *)pvarg;
+  struct audio_msg_s     msg;
+  unsigned int           prio;
+  int                    ret;
+  int                    size;
+
+  audinfo("Workerthread started.\n");
+
+#ifndef CONFIG_AUDIO_EXCLUDE_STOP
+  priv->terminating = false;
+#endif
+
+  /* Mark ourself as running */
+
+  priv->running = true;
+
+  /* Initial buffering */
+
+  ret = cxd56_start_dma(priv);
+  if (ret != CXD56_AUDIO_ECODE_OK)
+    {
+      auderr("Could not start DMA transfer. (%d)\n", ret);
+      priv->running = false;
+    }
+
+  while (priv->running)
+    {
+      size = nxmq_receive(priv->mq, (FAR char *)&msg, sizeof(msg), &prio);
+
+      /* Handle the case when we return with no message */
+
+      if (size == 0)
+        {
+          priv->running = false;
+          break;
+        }
+
+      /* Process the message */
+
+      switch (msg.msgId)
+        {
+          case AUDIO_MSG_STOP:
+            cxd56_stop_dma(priv);
+            priv->running = false;
+            audinfo("Workerthread stopped.\n");
+            break;
+
+          case AUDIO_MSG_DATA_REQUEST:
+            cxd56_start_dma(priv);
+            break;
+
+          case AUDIO_MSG_ENQUEUE:
+          default:
+            break;
+        }
+    }
+
+  mq_close(priv->mq);
+  mq_unlink(priv->mqname);
+  priv->mq = NULL;
+
+  /* Send AUDIO_MSG_COMPLETE to the client */
+
+#ifdef CONFIG_AUDIO_MULTI_SESSION
+  priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_COMPLETE, NULL, OK, NULL);
+#else
+  priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_COMPLETE, NULL, OK);
+#endif
+
+  return NULL;
+}
+
+/* Setup worker thread and message queue */
+
+static int cxd56_init_worker(FAR struct audio_lowerhalf_s *dev)
+{
+  FAR struct cxd56_dev_s *priv = (FAR struct cxd56_dev_s *)dev;
+  struct sched_param sparam;
+  struct mq_attr     m_attr;
+  pthread_attr_t     t_attr;
+  void               *value;
+  int                ret = CXD56_AUDIO_ECODE_OK;
+
+  snprintf(priv->mqname, sizeof(priv->mqname), "/tmp/%X", priv);
+
+  m_attr.mq_maxmsg  = 16;
+  m_attr.mq_msgsize = sizeof(struct audio_msg_s);
+  m_attr.mq_curmsgs = 0;
+  m_attr.mq_flags   = 0;
+
+  priv->mq = mq_open(priv->mqname, O_RDWR | O_CREAT, 0644, &m_attr);
+  if (priv->mq == NULL)
+    {
+      auderr("Could not allocate message queue.\n");
+      ret = -ENOMEM;
+      goto error;
+    }
+
+  /* Join any old worker thread we had created to prevent a memory leak */
+
+  if (priv->threadid != 0)
+    {
+      pthread_join(priv->threadid, &value);
+    }
+
+  pthread_attr_init(&t_attr);
+  sparam.sched_priority = sched_get_priority_max(SCHED_FIFO) - 3;
+  (void)pthread_attr_setschedparam(&t_attr, &sparam);
+  (void)pthread_attr_setstacksize(&t_attr,
+                                  CONFIG_CXD56_AUDIO_WORKER_STACKSIZE);
+
+  ret = pthread_create(&priv->threadid, &t_attr, cxd56_workerthread,
+                       (pthread_addr_t)priv);
+  if (ret != OK)
+    {
+      auderr("pthread_create failed. (%d)\n", ret);
+      goto error;
+    }
+  else
+    {
+      pthread_setname_np(priv->threadid, "cxd56");
+    }
+
+error:
+  return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: cxd56_initialize
+ *
+ * Description:
+ *   Initialize audio on the CXD56 device
+ *
+ * Input Parameters:
+ *
+ ****************************************************************************/
+
+struct audio_lowerhalf_s *cxd56_initialize(
+                         FAR const struct cxd56_lower_s *lower)
+{
+  FAR struct cxd56_dev_s *priv;
+
+  audinfo("cxd56_initialize\n");
+  priv = (FAR struct cxd56_dev_s *)kmm_zalloc(sizeof(struct cxd56_dev_s));
+  if (priv)
+    {
+      priv->dev.ops = &g_audioops;
+      priv->lower   = lower;
+      priv->state   = CXD56_DEV_STATE_OFF;
+
+      nxsem_init(&priv->pendsem, 0, 1);
+      dq_init(&priv->pendingq);
+      dq_init(&priv->runningq);
+    }
+
+  return &priv->dev;
+}
diff --git a/drivers/audio/cxd56.h b/drivers/audio/cxd56.h
new file mode 100644
index 0000000..1012df6
--- /dev/null
+++ b/drivers/audio/cxd56.h
@@ -0,0 +1,271 @@
+/****************************************************************************
+ * drivers/audio/cxd56.h
+ *
+ *   Copyright 2019 Sony Semiconductor Solutions Corporation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __DRIVERS_AUDIO_CXD56_H
+#define __DRIVERS_AUDIO_CXD56_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <pthread.h>
+#include <mqueue.h>
+
+#include <nuttx/audio/audio.h>
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+#include <nuttx/fs/ioctl.h>
+
+#ifdef CONFIG_AUDIO
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifndef CONFIG_CXD56_AUDIO_WORKER_STACKSIZE
+#  define CONFIG_CXD56_AUDIO_WORKER_STACKSIZE  768
+#endif
+
+#ifndef CONFIG_CXD56_MSG_PRIO
+#  define CONFIG_CXD56_MSG_PRIO  1
+#endif
+
+#ifdef CONFIG_CXD56_AUDIO_I2S_DEVICE_1_MASTER
+#  define CXD56_I2S1_MODE    0    /* Master */
+#else
+#  define CXD56_I2S1_MODE    1    /* Slave */
+#endif
+
+#ifdef CONFIG_CXD56_AUDIO_I2S_FORMAT_1_LEFT
+#  define CXD56_I2S1_FORMAT  1    /* Left */
+#else
+#  define CXD56_I2S1_FORMAT  0    /* Normal */
+#endif
+
+#ifdef CONFIG_CXD56_AUDIO_I2S_BYPASS_MODE_1_ENABLE
+#  define CXD56_I2S1_BYPASS  0    /* Disable */
+#else
+#  define CXD56_I2S1_BYPASS  1    /* Enable */
+#endif
+
+/* I2S data rate of I2S1 */
+
+#if defined(CONFIG_CXD56_I2S0)
+#  define CXD56_I2S1_DATA_RATE   CONFIG_CXD56_AUDIO_I2S_RATE_1
+#else
+#  define CXD56_I2S1_DATA_RATE   0
+#endif
+
+#define CXD56_XTAL_24_576MHZ  0
+#define CXD56_XTAL_49_152MHZ  1
+
+#ifdef CONFIG_CXD56_AUDIO_XTAL_SEL_49_152MHZ
+#  define CXD56_AUDIO_MCLK   CXD56_XTAL_49_152MHZ
+#else
+#  define CXD56_AUDIO_MCLK   CXD56_XTAL_24_576MHZ
+#endif
+
+/* Drive strength levels */
+#define CXD56_DS_WEAKEST    1
+#define CXD56_DS_WEAKER     2
+#define CXD56_DS_STRONGER   3
+#define CXD56_DS_STRONGEST  4
+
+/* Drive strength of global pin output-A */
+#if defined(CONFIG_CXD56_AUDIO_GPO_A_WEAKEST)
+#  define CXD56_GPO_A_DS    CXD56_DS_WEAKEST
+#elif defined(CONFIG_CXD56_AUDIO_GPO_A_WEAKER)
+#  define CXD56_GPO_A_DS    CXD56_DS_WEAKER
+#elif defined(CONFIG_CXD56_AUDIO_GPO_A_STRONGER)
+#  define CXD56_GPO_A_DS    CXD56_DS_STRONGER
+#else
+#  define CXD56_GPO_A_DS    CXD56_DS_STRONGEST
+#endif
+
+/* Drive strength of D/A converted data */
+#if defined(CONFIG_CXD56_AUDIO_DA_DATA_WEAKEST)
+#  define CXD56_DA_DS    CXD56_DS_WEAKEST
+#elif defined(CONFIG_CXD56_AUDIO_DA_DATA_WEAKER)
+#  define CXD56_DA_DS    CXD56_DS_WEAKER
+#elif defined(CONFIG_CXD56_AUDIO_DA_DATA_STRONGER)
+#  define CXD56_DA_DS    CXD56_DS_STRONGER
+#else
+#  define CXD56_DA_DS    CXD56_DS_STRONGEST
+#endif
+
+/* Drive strength of digital mic clock */
+#if defined(CONFIG_CXD56_AUDIO_CLKOUT_DMIC_WEAKEST)
+#  define CXD56_DMIC_CLK_DS    CXD56_DS_WEAKEST
+#elif defined(CONFIG_CXD56_AUDIO_CLKOUT_DMIC_WEAKER)
+#  define CXD56_DMIC_CLK_DS    CXD56_DS_WEAKER
+#elif defined(CONFIG_CXD56_AUDIO_CLKOUT_DMIC_STRONGER)
+#  define CXD56_DMIC_CLK_DS    CXD56_DS_STRONGER
+#else
+#  define CXD56_DMIC_CLK_DS    CXD56_DS_STRONGEST
+#endif
+
+/* Drive strength of master clock */
+#if defined(CONFIG_CXD56_AUDIO_MCLKOUT_WEAKEST)
+#  define CXD56_MCLKOUT_DS    CXD56_DS_WEAKEST
+#elif defined(CONFIG_CXD56_AUDIO_MCLKOUT_WEAKER)
+#  define CXD56_MCLKOUT_DS    CXD56_DS_WEAKER
+#elif defined(CONFIG_CXD56_AUDIO_MCLKOUT_STRONGER)
+#  define CXD56_MCLKOUT_DS    CXD56_DS_STRONGER
+#else
+#  define CXD56_MCLKOUT_DS    CXD56_DS_STRONGEST
+#endif
+
+/* Speaker time split on drive */
+#if defined(CONFIG_CXD56_AUDIO_SP_SPLIT_LONGEST)
+#  define CXD56_SP_SPLIT_ON    4
+#elif defined(CONFIG_CXD56_AUDIO_SP_SPLIT_LONG)
+#  define CXD56_SP_SPLIT_ON    3
+#elif defined(CONFIG_CXD56_AUDIO_SP_SPLIT_SHORT)
+#  define CXD56_SP_SPLIT_ON    2
+#else
+#  define CXD56_SP_SPLIT_ON    1
+#endif
+
+/* Speaker drive mode */
+
+#if defined(CONFIG_CXD56_AUDIO_SP_DRV_LINEOUT)
+#  define CXD56_SP_DRIVER   0
+#elif defined(CONFIG_CXD56_AUDIO_SP_DRV_1DRIVERT)
+#  define CXD56_SP_DRIVER   1
+#elif defined(CONFIG_CXD56_AUDIO_SP_DRV_2DRIVERT)
+#  define CXD56_SP_DRIVER   2
+#else
+#  define CXD56_SP_DRIVER   3
+#endif
+
+/* DMA format */
+
+#define CXD56_DMA_FORMAT_LR 0
+#define CXD56_DMA_FORMAT_RL 1
+
+#if defined(CONFIG_CXD56_AUDIO_DMA_DATA_FORMAT_LR)
+#  define CXD56_DMA_FORMAT  CXD56_DMA_FORMAT_LR
+#else
+#  define CXD56_DMA_FORMAT  CXD56_DMA_FORMAT_RL
+#endif
+
+/* Audio buffer configuration */
+
+#ifndef CONFIG_CXD56_AUDIO_BUFFER_SIZE
+#  define CONFIG_CXD56_AUDIO_BUFFER_SIZE  4096
+#endif
+
+#ifndef CONFIG_CXD56_AUDIO_NUM_BUFFERS
+#  define CONFIG_CXD56_AUDIO_NUM_BUFFERS  4
+#endif
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+enum cxd56_dmahandle_e
+{
+  CXD56_AUDIO_DMA_MIC,
+  CXD56_AUDIO_DMA_I2S0_DOWN,
+  CXD56_AUDIO_DMA_COUNT
+};
+typedef enum cxd56_dmahandle_e cxd56_dmahandle_t;
+
+enum cxd56_devstate_e
+{
+  CXD56_DEV_STATE_OFF,
+  CXD56_DEV_STATE_STOPPED,
+  CXD56_DEV_STATE_STARTING,
+  CXD56_DEV_STATE_STARTED,
+  CXD56_DEV_STATE_STOPPING,
+};
+
+struct cxd56_dev_s
+{
+  /* We are an audio lower half driver (We are also the upper "half" of
+   * the CS43L22 driver with respect to the board lower half driver).
+   *
+   * Terminology:
+   * Our "lower" half audio instances will be called dev for the publicly
+   * visible version and "priv" for the version that only this driver
+   * knows.  From the point of view of this driver, it is the board lower
+   * "half" that is referred to as "lower".
+   */
+
+  struct audio_lowerhalf_s dev;             /* CXD56 audio lower half (this device) */
+
+  /* Our specific driver data goes here */
+
+  const FAR struct cxd56_lower_s *lower;    /* Pointer to the board lower functions */
+  enum cxd56_devstate_e   state;            /* Driver state */
+  enum cxd56_dmahandle_e  dma_handle;       /* DMA handle */
+  mqd_t                   mq;               /* Message queue for receiving messages */
+  char                    mqname[16];       /* Our message queue name */
+  pthread_t               threadid;         /* ID of our thread */
+  sem_t                   pendsem;          /* Protect pendq */
+
+  struct dq_queue_s       pendingq;         /* Queue of pending buffers to be sent */
+  struct dq_queue_s       runningq;         /* Queue of buffers being played */
+
+  uint16_t                samplerate;       /* Sample rate */
+#ifndef CONFIG_AUDIO_EXCLUDE_VOLUME
+  int16_t                 volume;           /* Output volume {0..63} */
+#endif  /* CONFIG_AUDIO_EXCLUDE_VOLUME */
+  uint8_t                 channels;         /* Number of channels (1..8) */
+
+  /* enum cxd56_audio_samp_fmt_e  format; */ /* Output bits per sample (16 or 24) */
+
+  uint8_t                 bitwidth;         /* Bits per sample (16 or 24) */
+  bool                    muted;            /* True: Output is muted */
+
+  bool                    running;          /* True: Worker thread is running */
+  bool                    paused;           /* True: Playing is paused */
+#ifndef CONFIG_AUDIO_EXCLUDE_STOP
+  bool                    terminating;      /* True: Stop requested */
+#endif
+  bool                    reserved;         /* True: Device is reserved */
+  volatile int            result;           /* The result of the last transfer */
+};
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#endif /* CONFIG_AUDIO */
+
+#endif /* __DRIVERS_AUDIO_CXD56_H */
diff --git a/include/nuttx/audio/cxd56.h b/include/nuttx/audio/cxd56.h
new file mode 100644
index 0000000..7a0c872
--- /dev/null
+++ b/include/nuttx/audio/cxd56.h
@@ -0,0 +1,85 @@
+/****************************************************************************
+ * include/nuttx/audio/cxd56.h
+ *
+ *   Copyright 2019 Sony Semiconductor Solutions Corporation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_AUDIO_CXD56_H
+#define __INCLUDE_NUTTX_AUDIO_CXD56_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <nuttx/irq.h>
+
+#if defined(CONFIG_AUDIO_CXD56) || defined(CONFIG_CXD56_AUDIO)
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct cxd56_lower_s
+{
+  int dma_handle;
+};
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+struct audio_lowerhalf_s;
+
+FAR struct audio_lowerhalf_s *
+  cxd56_initialize(FAR const struct cxd56_lower_s *lower);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_CXD56_AUDIO */
+#endif /* __INCLUDE_NUTTX_AUDIO_CXD56_H */


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