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Diffstat (limited to 'include/i2s.h')
| -rw-r--r-- | include/i2s.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/include/i2s.h b/include/i2s.h new file mode 100644 index 0000000..75ae75c --- /dev/null +++ b/include/i2s.h @@ -0,0 +1,127 @@ +/* + * Copyright (C) 2012 Samsung Electronics + * R. Chandrasekar <rcsekar@samsung.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#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 */ +}; + +/* + * 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__ */ |