LXR linux/arch/arm/plat-omap/mux.c

   1/*
   2 * linux/arch/arm/plat-omap/mux.c
   3 *
   4 * Utility to set the Omap MUX and PULL_DWN registers from a table in mux.h
   5 *
   6 * Copyright (C) 2003 - 2008 Nokia Corporation
   7 *
   8 * Written by Tony Lindgren
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18 * GNU General Public License for more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program; if not, write to the Free Software
  22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23 *
  24 */
  25#include <linux/module.h>
  26#include <linux/init.h>
  27#include <linux/kernel.h>
  28#include <linux/io.h>
  29#include <asm/system.h>
  30#include <linux/spinlock.h>
  31#include <mach/mux.h>
  32
  33#ifdef CONFIG_OMAP_MUX
  34
  35static struct omap_mux_cfg *mux_cfg;
  36
  37int __init omap_mux_register(struct omap_mux_cfg *arch_mux_cfg)
  38{
  39        if (!arch_mux_cfg || !arch_mux_cfg->pins || arch_mux_cfg->size == 0
  40                        || !arch_mux_cfg->cfg_reg) {
  41                printk(KERN_ERR "Invalid pin table\n");
  42                return -EINVAL;
  43        }
  44
  45        mux_cfg = arch_mux_cfg;
  46
  47        return 0;
  48}
  49
  50/*
  51 * Sets the Omap MUX and PULL_DWN registers based on the table
  52 */
  53int __init_or_module omap_cfg_reg(const unsigned long index)
  54{
  55        struct pin_config *reg;
  56
  57        if (cpu_is_omap44xx())
  58                return 0;
  59
  60        if (mux_cfg == NULL) {
  61                printk(KERN_ERR "Pin mux table not initialized\n");
  62                return -ENODEV;
  63        }
  64
  65        if (index >= mux_cfg->size) {
  66                printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
  67                       index, mux_cfg->size);
  68                dump_stack();
  69                return -ENODEV;
  70        }
  71
  72        reg = (struct pin_config *)&mux_cfg->pins[index];
  73
  74        if (!mux_cfg->cfg_reg)
  75                return -ENODEV;
  76
  77        return mux_cfg->cfg_reg(reg);
  78}
  79EXPORT_SYMBOL(omap_cfg_reg);
  80#else
  81#define omap_mux_init() do {} while(0)
  82#define omap_cfg_reg(x) do {} while(0)
  83#endif  /* CONFIG_OMAP_MUX */
  84