53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/*
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* Copyright 2016-2021 NXP
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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*/
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#ifndef I2C_H
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#define I2C_H
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#include <lib/mmio.h>
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#define I2C_TIMEOUT 1000 /* ms */
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#define I2C_FD_CONSERV 0x7e
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#define I2C_CR_DIS (1 << 7)
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#define I2C_CR_EN (0 << 7)
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#define I2C_CR_MA (1 << 5)
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#define I2C_CR_TX (1 << 4)
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#define I2C_CR_TX_NAK (1 << 3)
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#define I2C_CR_RSTA (1 << 2)
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#define I2C_SR_BB (1 << 5)
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#define I2C_SR_IDLE (0 << 5)
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#define I2C_SR_AL (1 << 4)
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#define I2C_SR_IF (1 << 1)
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#define I2C_SR_RX_NAK (1 << 0)
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#define I2C_SR_RST (I2C_SR_AL | I2C_SR_IF)
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#define I2C_GLITCH_EN 0x8
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#define i2c_in(a) mmio_read_8((uintptr_t)(a))
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#define i2c_out(a, v) mmio_write_8((uintptr_t)(a), (v))
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struct ls_i2c {
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unsigned char ad; /* I2c Bus Address Register */
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unsigned char fd; /* I2c Bus Frequency Dividor Register */
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unsigned char cr; /* I2c Bus Control Register */
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unsigned char sr; /* I2c Bus Status Register */
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unsigned char dr; /* I2C Bus Data I/O Register */
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unsigned char ic; /* I2C Bus Interrupt Config Register */
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unsigned char dbg; /* I2C Bus Debug Register */
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};
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void i2c_init(uintptr_t nxp_i2c_addr);
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int i2c_read(unsigned char chip, int addr, int alen,
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unsigned char *buf, int len);
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int i2c_write(unsigned char chip, int addr, int alen,
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const unsigned char *buf, int len);
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int i2c_probe_chip(unsigned char chip);
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#endif /* I2C_H */
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