kernel/arch/arm/mach-omap1/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 <linux/i2c-omap.h>
  23 #include <mach/mux.h>
  24 #include "soc.h"
  25
  26 #include <plat/i2c.h>
  27
  28 #define OMAP_I2C_SIZE           0x3f
  29 #define OMAP1_I2C_BASE          0xfffb3800
  30 #define OMAP1_INT_I2C           (32 + 4)
  31
  32 static const char name[] = "omap_i2c";
  33
  34 static struct resource i2c_resources[2] = {
  35 };
  36
  37 static struct platform_device omap_i2c_devices[1] = {
  38 };
  39
  40 static void __init omap1_i2c_mux_pins(int bus_id)
  41 {
  42         if (cpu_is_omap7xx()) {
  43                 omap_cfg_reg(I2C_7XX_SDA);
  44                 omap_cfg_reg(I2C_7XX_SCL);
  45         } else {
  46                 omap_cfg_reg(I2C_SDA);
  47                 omap_cfg_reg(I2C_SCL);
  48         }
  49 }
  50
  51 int __init omap_i2c_add_bus(struct omap_i2c_bus_platform_data *pdata,
  52                                 int bus_id)
  53 {
  54         struct platform_device *pdev;
  55         struct resource *res;
  56
  57         if (bus_id > 1)
  58                 return -EINVAL;
  59
  60         omap1_i2c_mux_pins(bus_id);
  61
  62         pdev = &omap_i2c_devices[bus_id - 1];
  63         pdev->id = bus_id;
  64         pdev->name = name;
  65         pdev->num_resources = ARRAY_SIZE(i2c_resources);
  66         res = i2c_resources;
  67         res[0].start = OMAP1_I2C_BASE;
  68         res[0].end = res[0].start + OMAP_I2C_SIZE;
  69         res[0].flags = IORESOURCE_MEM;
  70         res[1].start = OMAP1_INT_I2C;
  71         res[1].flags = IORESOURCE_IRQ;
  72         pdev->resource = res;
  73
  74         /* all OMAP1 have IP version 1 register set */
  75         pdata->rev = OMAP_I2C_IP_VERSION_1;
  76
  77         /* all OMAP1 I2C are implemented like this */
  78         pdata->flags = OMAP_I2C_FLAG_NO_FIFO |
  79                        OMAP_I2C_FLAG_SIMPLE_CLOCK |
  80                        OMAP_I2C_FLAG_16BIT_DATA_REG |
  81                        OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK;
  82
  83         /* how the cpu bus is wired up differs for 7xx only */
  84
  85         if (cpu_is_omap7xx())
  86                 pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_1;
  87         else
  88                 pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_2;
  89
  90         pdev->dev.platform_data = pdata;
  91
  92         return platform_device_register(pdev);
  93 }
  94
  95 static  int __init omap_i2c_cmdline(void)
  96 {
  97         return omap_register_i2c_bus_cmdline();
  98 }
  99 subsys_initcall(omap_i2c_cmdline);