1 /* 2 * Copyright 2016-2021 NXP 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 */ 7 8 9 #ifndef I2C_H 10 #define I2C_H 11 12 #include <lib/mmio.h> 13 14 #define I2C_TIMEOUT 1000 /* ms */ 15 16 #define I2C_FD_CONSERV 0x7e 17 #define I2C_CR_DIS (1 << 7) 18 #define I2C_CR_EN (0 << 7) 19 #define I2C_CR_MA (1 << 5) 20 #define I2C_CR_TX (1 << 4) 21 #define I2C_CR_TX_NAK (1 << 3) 22 #define I2C_CR_RSTA (1 << 2) 23 #define I2C_SR_BB (1 << 5) 24 #define I2C_SR_IDLE (0 << 5) 25 #define I2C_SR_AL (1 << 4) 26 #define I2C_SR_IF (1 << 1) 27 #define I2C_SR_RX_NAK (1 << 0) 28 #define I2C_SR_RST (I2C_SR_AL | I2C_SR_IF) 29 30 #define I2C_GLITCH_EN 0x8 31 32 #define i2c_in(a) mmio_read_8((uintptr_t)(a)) 33 #define i2c_out(a, v) mmio_write_8((uintptr_t)(a), (v)) 34 35 struct ls_i2c { 36 unsigned char ad; /* I2c Bus Address Register */ 37 unsigned char fd; /* I2c Bus Frequency Dividor Register */ 38 unsigned char cr; /* I2c Bus Control Register */ 39 unsigned char sr; /* I2c Bus Status Register */ 40 unsigned char dr; /* I2C Bus Data I/O Register */ 41 unsigned char ic; /* I2C Bus Interrupt Config Register */ 42 unsigned char dbg; /* I2C Bus Debug Register */ 43 }; 44 45 void i2c_init(uintptr_t nxp_i2c_addr); 46 int i2c_read(unsigned char chip, int addr, int alen, 47 unsigned char *buf, int len); 48 int i2c_write(unsigned char chip, int addr, int alen, 49 const unsigned char *buf, int len); 50 int i2c_probe_chip(unsigned char chip); 51 52 #endif /* I2C_H */ 53