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 <asm/system.h>
  29 #include <asm/io.h>
  30 #include <linux/spinlock.h>
  31 #include <asm/arch/mux.h>
  32
  33 #ifdef CONFIG_OMAP_MUX
  34
  35 static struct omap_mux_cfg *mux_cfg;
  36
  37 int __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  */
  53 int __init_or_module omap_cfg_reg(const unsigned long index)
  54 {
  55         struct pin_config *reg;
  56
  57         if (mux_cfg == NULL) {
  58                 printk(KERN_ERR "Pin mux table not initialized\n");
  59                 return -ENODEV;
  60         }
  61
  62         if (index >= mux_cfg->size) {
  63                 printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
  64                        index, mux_cfg->size);
  65                 dump_stack();
  66                 return -ENODEV;
  67         }
  68
  69         reg = (struct pin_config *)&mux_cfg->pins[index];
  70
  71         if (!mux_cfg->cfg_reg)
  72                 return -ENODEV;
  73
  74         return mux_cfg->cfg_reg(reg);
  75 }
  76 EXPORT_SYMBOL(omap_cfg_reg);
  77 #else
  78 #define omap_mux_init() do {} while(0)
  79 #define omap_cfg_reg(x) do {} while(0)
  80 #endif  /* CONFIG_OMAP_MUX */