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/*
* linux/arch/arm/mach-omap/mux.c
*
* Utility to set the Omap MUX and PULL_DWN registers from a table in mux.h
*
* Copyright (C) 2003 Nokia Corporation
*
* Written by Tony Lindgren <tony.lindgren@nokia.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <asm/system.h>
#include <asm/io.h>
#include <linux/spinlock.h>
#define __MUX_C__
#include <asm/arch/mux.h>
#ifdef CONFIG_OMAP_MUX
/*
* Sets the Omap MUX and PULL_DWN registers based on the table
*/
int __init_or_module
omap_cfg_reg(const reg_cfg_t reg_cfg)
{
static DEFINE_SPINLOCK(mux_spin_lock);
unsigned long flags;
reg_cfg_set *cfg;
unsigned int reg_orig = 0, reg = 0, pu_pd_orig = 0, pu_pd = 0,
pull_orig = 0, pull = 0;
unsigned int mask, warn = 0;
if (reg_cfg > ARRAY_SIZE(reg_cfg_table)) {
printk(KERN_ERR "MUX: reg_cfg %d\n", reg_cfg);
return -EINVAL;
}
cfg = ®_cfg_table[reg_cfg];
/*
* We do a pretty long section here with lock on, but pin muxing
* should only happen on driver init for each driver, so it's not time
* critical.
*/
spin_lock_irqsave(&mux_spin_lock, flags);
/* Check the mux register in question */
if (cfg->mux_reg) {
unsigned tmp1, tmp2;
reg_orig = omap_readl(cfg->mux_reg);
/* The mux registers always seem to be 3 bits long */
mask = (0x7 << cfg->mask_offset);
tmp1 = reg_orig & mask;
reg = reg_orig & ~mask;
tmp2 = (cfg->mask << cfg->mask_offset);
reg |= tmp2;
if (tmp1 != tmp2)
warn = 1;
omap_writel(reg, cfg->mux_reg);
}
/* Check for pull up or pull down selection on 1610 */
if (!cpu_is_omap1510()) {
if (cfg->pu_pd_reg && cfg->pull_val) {
pu_pd_orig = omap_readl(cfg->pu_pd_reg);
mask = 1 << cfg->pull_bit;
if (cfg->pu_pd_val) {
if (!(pu_pd_orig & mask))
warn = 1;
/* Use pull up */
pu_pd = pu_pd_orig | mask;
} else {
if (pu_pd_orig & mask)
warn = 1;
/* Use pull down */
pu_pd = pu_pd_orig & ~mask;
}
omap_writel(pu_pd, cfg->pu_pd_reg);
}
}
/* Check for an associated pull down register */
if (cfg->pull_reg) {
pull_orig = omap_readl(cfg->pull_reg);
mask = 1 << cfg->pull_bit;
if (cfg->pull_val) {
if (pull_orig & mask)
warn = 1;
/* Low bit = pull enabled */
pull = pull_orig & ~mask;
} else {
if (!(pull_orig & mask))
warn = 1;
/* High bit = pull disabled */
pull = pull_orig | mask;
}
omap_writel(pull, cfg->pull_reg);
}
if (warn) {
#ifdef CONFIG_OMAP_MUX_WARNINGS
printk(KERN_WARNING "MUX: initialized %s\n", cfg->name);
#endif
}
#ifdef CONFIG_OMAP_MUX_DEBUG
if (cfg->debug || warn) {
printk("MUX: Setting register %s\n", cfg->name);
printk(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
cfg->mux_reg_name, cfg->mux_reg, reg_orig, reg);
if (!cpu_is_omap1510()) {
if (cfg->pu_pd_reg && cfg->pull_val) {
printk(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
cfg->pu_pd_name, cfg->pu_pd_reg,
pu_pd_orig, pu_pd);
}
}
if (cfg->pull_reg)
printk(" %s (0x%08x) = 0x%08x -> 0x%08x\n",
cfg->pull_name, cfg->pull_reg, pull_orig, pull);
}
#endif
spin_unlock_irqrestore(&mux_spin_lock, flags);
#ifdef CONFIG_OMAP_MUX_ERRORS
return warn ? -ETXTBSY : 0;
#else
return 0;
#endif
}
EXPORT_SYMBOL(omap_cfg_reg);
#endif /* CONFIG_OMAP_MUX */
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