/* * 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__ */