path: root/arch/arm/mach-omap2/mux.c

/*
 * linux/arch/arm/mach-omap2/mux.c
 *
 * OMAP2, OMAP3 and OMAP4 pin multiplexing configurations
 *
 * Copyright (C) 2004 - 2010 Texas Instruments Inc.
 * 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/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/irq.h>
#include <linux/interrupt.h>

#include <asm/system.h>

#include <plat/omap_hwmod.h>

#include "control.h"
#include "mux.h"
#include "prm.h"

#define OMAP_MUX_BASE_OFFSET		0x30	/* Offset from CTRL_BASE */
#define OMAP_MUX_BASE_SZ		0x5ca

struct omap_mux_entry {
	struct omap_mux		mux;
	struct list_head	node;
};

static LIST_HEAD(mux_partitions);
static DEFINE_MUTEX(muxmode_mutex);

struct omap_mux_partition *omap_mux_get(const char *name)
{
	struct omap_mux_partition *partition;

	list_for_each_entry(partition, &mux_partitions, node) {
		if (!strcmp(name, partition->name))
			return partition;
	}

	return NULL;
}

u16 omap_mux_read(struct omap_mux_partition *partition, u16 reg)
{
	if (partition->flags & OMAP_MUX_REG_8BIT)
		return __raw_readb(partition->base + reg);
	else
		return __raw_readw(partition->base + reg);
}

void omap_mux_write(struct omap_mux_partition *partition, u16 val,
			   u16 reg)
{
	if (partition->flags & OMAP_MUX_REG_8BIT)
		__raw_writeb(val, partition->base + reg);
	else
		__raw_writew(val, partition->base + reg);
}

void omap_mux_write_array(struct omap_mux_partition *partition,
				 struct omap_board_mux *board_mux)
{
	if (!board_mux)
		return;

	while (board_mux->reg_offset != OMAP_MUX_TERMINATOR) {
		omap_mux_write(partition, board_mux->value,
			       board_mux->reg_offset);
		board_mux++;
	}
}

#ifdef CONFIG_OMAP_MUX

static char *omap_mux_options;

static int __init _omap_mux_init_gpio(struct omap_mux_partition *partition,
				      int gpio, int val)
{
	struct omap_mux_entry *e;
	struct omap_mux *gpio_mux = NULL;
	u16 old_mode;
	u16 mux_mode;
	int found = 0;
	struct list_head *muxmodes = &partition->muxmodes;

	if (!gpio)
		return -EINVAL;

	list_for_each_entry(e, muxmodes, node) {
		struct omap_mux *m = &e->mux;
		if (gpio == m->gpio) {
			gpio_mux = m;
			found++;
		}
	}

	if (found == 0) {
		pr_err("%s: Could not set gpio%i\n", __func__, gpio);
		return -ENODEV;
	}

	if (found > 1) {
		pr_info("%s: Multiple gpio paths (%d) for gpio%i\n", __func__,
			found, gpio);
		return -EINVAL;
	}

	old_mode =