11f045217Swdenk /* 21f045217Swdenk * (C) Copyright 2001 31f045217Swdenk * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com. 41f045217Swdenk * 51f045217Swdenk * See file CREDITS for list of people who contributed to this 61f045217Swdenk * project. 71f045217Swdenk * 81f045217Swdenk * This program is free software; you can redistribute it and/or 91f045217Swdenk * modify it under the terms of the GNU General Public License as 101f045217Swdenk * published by the Free Software Foundation; either version 2 of 111f045217Swdenk * the License, or (at your option) any later version. 121f045217Swdenk * 131f045217Swdenk * This program is distributed in the hope that it will be useful, 141f045217Swdenk * but WITHOUT ANY WARRANTY; without even the implied warranty of 151f045217Swdenk * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 161f045217Swdenk * GNU General Public License for more details. 171f045217Swdenk * 181f045217Swdenk * You should have received a copy of the GNU General Public License 191f045217Swdenk * along with this program; if not, write to the Free Software 201f045217Swdenk * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 211f045217Swdenk * MA 02111-1307 USA 221f045217Swdenk * 231f045217Swdenk * The original I2C interface was 241f045217Swdenk * (C) 2000 by Paolo Scaffardi (arsenio@tin.it) 251f045217Swdenk * AIRVENT SAM s.p.a - RIMINI(ITALY) 261f045217Swdenk * but has been changed substantially. 271f045217Swdenk */ 281f045217Swdenk 291f045217Swdenk #ifndef _I2C_H_ 301f045217Swdenk #define _I2C_H_ 311f045217Swdenk 321f045217Swdenk /* 331f045217Swdenk * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING 341f045217Swdenk * 351f045217Swdenk * The implementation MUST NOT use static or global variables if the 361f045217Swdenk * I2C routines are used to read SDRAM configuration information 371f045217Swdenk * because this is done before the memories are initialized. Limited 381f045217Swdenk * use of stack-based variables are OK (the initial stack size is 391f045217Swdenk * limited). 401f045217Swdenk * 411f045217Swdenk * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING 421f045217Swdenk */ 431f045217Swdenk 441f045217Swdenk /* 451f045217Swdenk * Configuration items. 461f045217Swdenk */ 471f045217Swdenk #define I2C_RXTX_LEN 128 /* maximum tx/rx buffer length */ 481f045217Swdenk 491f045217Swdenk /* 501f045217Swdenk * Initialization, must be called once on start up, may be called 511f045217Swdenk * repeatedly to change the speed and slave addresses. 521f045217Swdenk */ 531f045217Swdenk void i2c_init(int speed, int slaveaddr); 54*06d01dbeSwdenk #ifdef CFG_I2C_INIT_BOARD 55*06d01dbeSwdenk void i2c_init_board(void); 56*06d01dbeSwdenk #endif 571f045217Swdenk 581f045217Swdenk /* 591f045217Swdenk * Probe the given I2C chip address. Returns 0 if a chip responded, 601f045217Swdenk * not 0 on failure. 611f045217Swdenk */ 621f045217Swdenk int i2c_probe(uchar chip); 631f045217Swdenk 641f045217Swdenk /* 651f045217Swdenk * Read/Write interface: 661f045217Swdenk * chip: I2C chip address, range 0..127 671f045217Swdenk * addr: Memory (register) address within the chip 681f045217Swdenk * alen: Number of bytes to use for addr (typically 1, 2 for larger 691f045217Swdenk * memories, 0 for register type devices with only one 701f045217Swdenk * register) 711f045217Swdenk * buffer: Where to read/write the data 721f045217Swdenk * len: How many bytes to read/write 731f045217Swdenk * 741f045217Swdenk * Returns: 0 on success, not 0 on failure 751f045217Swdenk */ 761f045217Swdenk int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len); 771f045217Swdenk int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len); 781f045217Swdenk 791f045217Swdenk /* 801f045217Swdenk * Utility routines to read/write registers. 811f045217Swdenk */ 821f045217Swdenk uchar i2c_reg_read (uchar chip, uchar reg); 831f045217Swdenk void i2c_reg_write(uchar chip, uchar reg, uchar val); 841f045217Swdenk 851f045217Swdenk #endif /* _I2C_H_ */ 86