LXR linux/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
  31static const char name[] = "omap_i2c";
  32
  33static struct resource i2c_resources[2] = {
  34};
  35
  36static struct platform_device omap_i2c_devices[1] = {
  37};
  38
  39static void __init omap1_i2c_mux_pins(int bus_id)
  40{
  41        if (cpu_is_omap7xx()) {
  42                omap_cfg_reg(I2C_7XX_SDA);
  43                omap_cfg_reg(I2C_7XX_SCL);
  44        } else {
  45                omap_cfg_reg(I2C_SDA);
  46                omap_cfg_reg(I2C_SCL);
  47        }
  48}
  49
  50int __init omap_i2c_add_bus(struct omap_i2c_bus_platform_data *pdata,
  51                                int bus_id)
  52{
  53        struct platform_device *pdev;
  54        struct resource *res;
  55
  56        if (bus_id > 1)
  57                return -EINVAL;
  58
  59        omap1_i2c_mux_pins(bus_id);
  60
  61        pdev = &omap_i2c_devices[bus_id - 1];
  62        pdev->id = bus_id;
  63        pdev->name = name;
  64        pdev->num_resources = ARRAY_SIZE(i2c_resources);
  65        res = i2c_resources;
  66        res[0].start = OMAP1_I2C_BASE;
  67        res[0].end = res[0].start + OMAP_I2C_SIZE;
  68        res[0].flags = IORESOURCE_MEM;
  69        res[1].start = INT_I2C;
  70        res[1].flags = IORESOURCE_IRQ;
  71        pdev->resource = res;
  72
  73        /* all OMAP1 have IP version 1 register set */
  74        pdata->rev = OMAP_I2C_IP_VERSION_1;
  75
  76        /* all OMAP1 I2C are implemented like this */
  77        pdata->flags = OMAP_I2C_FLAG_NO_FIFO |
  78                       OMAP_I2C_FLAG_SIMPLE_CLOCK |
  79                       OMAP_I2C_FLAG_16BIT_DATA_REG |
  80                       OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK;
  81
  82        /* how the cpu bus is wired up differs for 7xx only */
  83
  84        if (cpu_is_omap7xx())
  85                pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_1;
  86        else
  87                pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_2;
  88
  89        pdev->dev.platform_data = pdata;
  90
  91        return platform_device_register(pdev);
  92}
  93
  94static  int __init omap_i2c_cmdline(void)
  95{
  96        return omap_register_i2c_bus_cmdline();
  97}
  98subsys_initcall(omap_i2c_cmdline);
  99