arch/arm/mach-omap2/i2c.c

   1 /*
   2  * Helper module for board specific I2C bus registration
   3  *
   4  * Copyright (C) 2009 Nokia Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  18  * 02110-1301 USA
  19  *
  20  */
  21
  22 #include <plat/cpu.h>
  23 #include <plat/i2c.h>
  24 #include <plat/mux.h>
  25
  26 #include "mux.h"
  27
  28 int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
  29                           struct i2c_board_info const *info,
  30                           unsigned len)
  31 {
  32         if (cpu_is_omap24xx()) {
  33                 const int omap24xx_pins[][2] = {
  34                         { M19_24XX_I2C1_SCL, L15_24XX_I2C1_SDA },
  35                         { J15_24XX_I2C2_SCL, H19_24XX_I2C2_SDA },
  36                 };
  37                 int scl, sda;
  38
  39                 scl = omap24xx_pins[bus_id - 1][0];
  40                 sda = omap24xx_pins[bus_id - 1][1];
  41                 omap_cfg_reg(sda);
  42                 omap_cfg_reg(scl);
  43         }
  44
  45         /* First I2C bus is not muxable */
  46         if (cpu_is_omap34xx() && bus_id > 1) {
  47                 char mux_name[sizeof("i2c2_scl.i2c2_scl")];
  48
  49                 sprintf(mux_name, "i2c%i_scl.i2c%i_scl", bus_id, bus_id);
  50                 omap_mux_init_signal(mux_name, OMAP_PIN_INPUT);
  51                 sprintf(mux_name, "i2c%i_sda.i2c%i_sda", bus_id, bus_id);
  52                 omap_mux_init_signal(mux_name, OMAP_PIN_INPUT);
  53         }
  54
  55         return omap_plat_register_i2c_bus(bus_id, clkrate, info, len);
  56 }