1 files changed, 126 insertions, 0 deletions
diff --git a/include/i2s.h b/include/i2s.h
new file mode 100644
index 0000000..7760aab
--- /dev/null
+++ b/include/i2s.h
@@ -0,0 +1,126 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2012 Samsung Electronics
+ * R. Chandrasekar <rcsekar@samsung.com>
+ */
+
+#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 i2s_uc_priv {
+	unsigned int rfs;		/* LR clock frame size */
+	unsigned int bfs;		/* Bit clock 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 */
+};
+
+/* Operations for i2s devices */
+struct i2s_ops {
+	/**
+	 * tx_data() - Transmit audio data
+	 *
+	 * @dev: I2C device
+	 * @data: Data buffer to play
+	 * @data_size: Size of data buffer in bytes
+	 * @return 0 if OK, -ve on error
+	 */
+	int (*tx_data)(struct udevice *dev, void *data, uint data_size);
+};
+
+#define i2s_get_ops(dev)	((struct i2s_ops *)(dev)->driver->ops)
+
+/**
+ * i2s_tx_data() - Transmit audio data
+ *
+ * @dev: I2C device
+ * @data: Data buffer to play
+ * @data_size: Size of data buffer in bytes
+ * @return 0 if OK, -ve on error
+ */
+int i2s_tx_data(struct udevice *dev, void *data, uint data_size);
+
+/*
+ * 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	size of the data (in bytes)
+ * @return		int value 0 for success, -1 in case of error
+ */
+int i2s_transfer_tx_data(struct i2s_uc_priv *pi2s_tx, void *data,
+			 uint data_size);
+
+#endif /* __I2S_H__ */