i2s.h
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/*
* Copyright (C) 2012 Samsung Electronics
* R. Chandrasekar <rcsekar@samsung.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __I2S_H__
#define __I2S_H__
/*
* DAI hardware audio formats.
*
* Describes the physical PCM data formating and clocking. Add new formats
* to the end.
*/
#define SND_SOC_DAIFMT_I2S 1 /* I2S mode */
#define SND_SOC_DAIFMT_RIGHT_J 2 /* Right Justified mode */
#define SND_SOC_DAIFMT_LEFT_J 3 /* Left Justified mode */
#define SND_SOC_DAIFMT_DSP_A 4 /* L data MSB after FRM LRC */
#define SND_SOC_DAIFMT_DSP_B 5 /* L data MSB during FRM LRC */
#define SND_SOC_DAIFMT_AC97 6 /* AC97 */
#define SND_SOC_DAIFMT_PDM 7 /* Pulse density modulation */
/* left and right justified also known as MSB and LSB respectively */
#define SND_SOC_DAIFMT_MSB SND_SOC_DAIFMT_LEFT_J
#define SND_SOC_DAIFMT_LSB SND_SOC_DAIFMT_RIGHT_J
/*
* DAI hardware signal inversions.
*
* Specifies whether the DAI can also support inverted clocks for the specified
* format.
*/
#define SND_SOC_DAIFMT_NB_NF (1 << 8) /* normal bit clock + frame */
#define SND_SOC_DAIFMT_NB_IF (2 << 8) /* normal BCLK + inv FRM */
#define SND_SOC_DAIFMT_IB_NF (3 << 8) /* invert BCLK + nor FRM */
#define SND_SOC_DAIFMT_IB_IF (4 << 8) /* invert BCLK + FRM */
/*
* DAI hardware clock masters.
*
* This is wrt the codec, the inverse is true for the interface
* i.e. if the codec is clk and FRM master then the interface is
* clk and frame slave.
*/
#define SND_SOC_DAIFMT_CBM_CFM (1 << 12) /* codec clk & FRM master */
#define SND_SOC_DAIFMT_CBS_CFM (2 << 12) /* codec clk slave & FRM master */
#define SND_SOC_DAIFMT_CBM_CFS (3 << 12) /* codec clk master & frame slave */
#define SND_SOC_DAIFMT_CBS_CFS (4 << 12) /* codec clk & FRM slave */
#define SND_SOC_DAIFMT_FORMAT_MASK 0x000f
#define SND_SOC_DAIFMT_CLOCK_MASK 0x00f0
#define SND_SOC_DAIFMT_INV_MASK 0x0f00
#define SND_SOC_DAIFMT_MASTER_MASK 0xf000
/*
* Master Clock Directions
*/
#define SND_SOC_CLOCK_IN 0
#define SND_SOC_CLOCK_OUT 1
/* I2S Tx Control */
#define I2S_TX_ON 1
#define I2S_TX_OFF 0
#define FIFO_LENGTH 64
/* I2s Registers */
struct i2s_reg {
unsigned int con; /* base + 0 , Control register */
unsigned int mod; /* Mode register */
unsigned int fic; /* FIFO control register */
unsigned int psr; /* Reserved */
unsigned int txd; /* Transmit data register */
unsigned int rxd; /* Receive Data Register */
};
/* This structure stores the i2s related information */
struct i2stx_info {
unsigned int rfs; /* LR clock frame size */
unsigned int bfs; /* Bit slock frame size */
unsigned int audio_pll_clk; /* Audio pll frequency in Hz */
unsigned int samplingrate; /* sampling rate */
unsigned int bitspersample; /* bits per sample */
unsigned int channels; /* audio channels */
unsigned int base_address; /* I2S Register Base */
unsigned int id; /* I2S controller id */
};
/*
* Sends the given data through i2s tx
*
* @param pi2s_tx pointer of i2s transmitter parameter structure.
* @param data address of the data buffer
* @param data_size array size of the int buffer (total size / size of int)
*
* @return int value 0 for success, -1 in case of error
*/
int i2s_transfer_tx_data(struct i2stx_info *pi2s_tx, unsigned *data,
unsigned long data_size);
/*
* Initialise i2s transmiter
*
* @param pi2s_tx pointer of i2s transmitter parameter structure.
*
* @return int value 0 for success, -1 in case of error
*/
int i2s_tx_init(struct i2stx_info *pi2s_tx);
#endif /* __I2S_H__ */