arch/arm/plat-nomadik/include/plat/i2c.h

   1 /*
   2  * Copyright (C) 2009 ST-Ericsson
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2, as
   6  * published by the Free Software Foundation.
   7  */
   8 #ifndef __PLAT_I2C_H
   9 #define __PLAT_I2C_H
  10
  11 enum i2c_freq_mode {
  12         I2C_FREQ_MODE_STANDARD,         /* up to 100 Kb/s */
  13         I2C_FREQ_MODE_FAST,             /* up to 400 Kb/s */
  14         I2C_FREQ_MODE_FAST_PLUS,        /* up to 1 Mb/s */
  15         I2C_FREQ_MODE_HIGH_SPEED        /* up to 3.4 Mb/s */
  16 };
  17
  18 /**
  19  * struct nmk_i2c_controller - client specific controller configuration
  20  * @clk_freq:   clock frequency for the operation mode
  21  * @slsu:       Slave data setup time in ns.
  22  *              The needed setup time for three modes of operation
  23  *              are 250ns, 100ns and 10ns respectively thus leading
  24  *              to the values of 14, 6, 2 for a 48 MHz i2c clk
  25  * @tft:        Tx FIFO Threshold in bytes
  26  * @rft:        Rx FIFO Threshold in bytes
  27  * @sm:         speed mode
  28  */
  29 struct nmk_i2c_controller {
  30         unsigned long   clk_freq;
  31         unsigned short  slsu;
  32         unsigned char   tft;
  33         unsigned char   rft;
  34         enum i2c_freq_mode      sm;
  35 };
  36
  37 #endif  /* __PLAT_I2C_H */