[mirror_ubuntu-zesty-kernel.git] / arch / arm / plat-omap / mux.c

/*
 * linux/arch/arm/plat-omap/mux.c
 *
 * Utility to set the Omap MUX and PULL_DWN registers from a table in mux.h
 *
 * Copyright (C) 2003 - 2008 Nokia Corporation
 *
 * Written by Tony Lindgren
 *
 * 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/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <asm/system.h>
#include <linux/spinlock.h>
#include <plat/mux.h>

#ifdef CONFIG_OMAP_MUX

static struct omap_mux_cfg *mux_cfg;

int __init omap_mux_register(struct omap_mux_cfg *arch_mux_cfg)
{
	if (!arch_mux_cfg || !arch_mux_cfg->pins || arch_mux_cfg->size == 0
			|| !arch_mux_cfg->cfg_reg) {
		printk(KERN_ERR "Invalid pin table\n");
		return -EINVAL;
	}

	mux_cfg = arch_mux_cfg;

	return 0;
}

/*
 * Sets the Omap MUX and PULL_DWN registers based on the table
 */
int __init_or_module omap_cfg_reg(const unsigned long index)
{
	struct pin_config *reg;

	if (cpu_is_omap44xx())
		return 0;

	if (mux_cfg == NULL) {
		printk(KERN_ERR "Pin mux table not initialized\n");
		return -ENODEV;
	}

	if (index >= mux_cfg->size) {
		printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
		       index, mux_cfg->size);
		dump_stack();
		return -ENODEV;
	}

	reg = (struct pin_config *)&mux_cfg->pins[index];

	if (!mux_cfg->cfg_reg)
		return -ENODEV;

	return mux_cfg->cfg_reg(reg);
}
EXPORT_SYMBOL(omap_cfg_reg);
#else
#define omap_mux_init() do {} while(0)
#define omap_cfg_reg(x)	do {} while(0)
#endif	/* CONFIG_OMAP_MUX */
Commit	Line	Data
5e1c5ff4 TL	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	*
9330899e	6	* Copyright (C) 2003 - 2008 Nokia Corporation
5e1c5ff4	7	*
9330899e	8	* Written by Tony Lindgren
5e1c5ff4 TL	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	*/
5e1c5ff4 TL	25	#include <linux/module.h>
5e1c5ff4 TL	26	#include <linux/init.h>
1a8bfa1e	27	#include <linux/kernel.h>
fced80c7	28	#include <linux/io.h>
5e1c5ff4	29	#include <asm/system.h>
5e1c5ff4	30	#include <linux/spinlock.h>
ce491cf8	31	#include <plat/mux.h>
5e1c5ff4 TL	32
	33	#ifdef CONFIG_OMAP_MUX
	34
7d7f665d	35	static struct omap_mux_cfg *mux_cfg;
1a8bfa1e	36
7d7f665d	37	int __init omap_mux_register(struct omap_mux_cfg *arch_mux_cfg)
1a8bfa1e	38	{
7d7f665d TL	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;
1a8bfa1e TL	46
	47	return 0;
	48	}
	49
5e1c5ff4 TL	50	/*
	51	* Sets the Omap MUX and PULL_DWN registers based on the table
	52	*/
1a8bfa1e	53	int __init_or_module omap_cfg_reg(const unsigned long index)
5e1c5ff4	54	{
225dfda1	55	struct pin_config *reg;
5e1c5ff4	56
44169075 SS	57	if (cpu_is_omap44xx())
	58	return 0;
	59
7d7f665d TL	60	if (mux_cfg == NULL) {
	61	printk(KERN_ERR "Pin mux table not initialized\n");
	62	return -ENODEV;
	63	}
92105bb7	64
7d7f665d	65	if (index >= mux_cfg->size) {
1a8bfa1e	66	printk(KERN_ERR "Invalid pin mux index: %lu (%lu)\n",
7d7f665d	67	index, mux_cfg->size);
1a8bfa1e TL	68	dump_stack();
1a8bfa1e TL	69	return -ENODEV;
5e1c5ff4 TL	70	}
5e1c5ff4 TL	71
225dfda1	72	reg = (struct pin_config *)&mux_cfg->pins[index];
5e1c5ff4	73
225dfda1 TL	74	if (!mux_cfg->cfg_reg)
225dfda1 TL	75	return -ENODEV;
5e1c5ff4	76
225dfda1	77	return mux_cfg->cfg_reg(reg);
5e1c5ff4	78	}
5e1c5ff4	79	EXPORT_SYMBOL(omap_cfg_reg);
1a8bfa1e TL	80	#else
	81	#define omap_mux_init() do {} while(0)
	82	#define omap_cfg_reg(x) do {} while(0)
5e1c5ff4	83	#endif /* CONFIG_OMAP_MUX */