[deliverable/linux.git] / arch / arm / mach-omap2 / mux.c

/*
 * linux/arch/arm/mach-omap2/mux.c
 *
 * OMAP2 and OMAP3 pin multiplexing configurations
 *
 * Copyright (C) 2004 - 2008 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 <asm/system.h>

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

#define OMAP_MUX_BASE_OFFSET		0x30	/* Offset from CTRL_BASE */
#define OMAP_MUX_BASE_SZ		0x5ca
#define MUXABLE_GPIO_MODE3		BIT(0)

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

static unsigned long mux_phys;
static void __iomem *mux_base;
static u8 omap_mux_flags;

u16 omap_mux_read(u16 reg)
{
	if (cpu_is_omap24xx())
		return __raw_readb(mux_base + reg);
	else
		return __raw_readw(mux_base + reg);
}

void omap_mux_write(u16 val, u16 reg)
{
	if (cpu_is_omap24xx())
		__raw_writeb(val, mux_base + reg);
	else
		__raw_writew(val, mux_base + reg);
}

void omap_mux_write_array(struct omap_board_mux *board_mux)
{
	while (board_mux->reg_offset !=  OMAP_MUX_TERMINATOR) {
		omap_mux_write(board_mux->value, board_mux->reg_offset);
		board_mux++;
	}
}

static LIST_HEAD(muxmodes);
static DEFINE_MUTEX(muxmode_mutex);

#ifdef CONFIG_OMAP_MUX

static char *omap_mux_options;

int __init omap_mux_init_gpio(int gpio, int val)
{
	struct omap_mux_entry *e;
	struct omap_mux *gpio_mux = NULL;
	u16 old_mode;
	u16 mux_mode;
	int found = 0;

	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) {
		printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
		return -ENODEV;
	}

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

	old_mode = omap_mux_read(gpio_mux->reg_offset);
	mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
	if (omap_mux_flags & MUXABLE_GPIO_MODE3)
		mux_mode |= OMAP_MUX_MODE3;
	else
		mux_mode |= OMAP_MUX_MODE4;
	printk(KERN_DEBUG "mux: Setting signal %s.gpio%i 0x%04x -> 0x%04x\n",
			gpio_mux->muxnames[0], gpio, old_mode, mux_mode);
	omap_mux_write(mux_mode, gpio_mux->reg_offset);

	return 0;
}

int __init omap_mux_init_signal(const char *muxname, int val)
{
	struct omap_mux_entry *e;
	const char *mode_name;
	int found = 0, mode0_len = 0;

	mode_name = strchr(muxname, '.');
	if (mode_name) {
		mode0_len = strlen(muxname) - strlen(mode_name);
		mode_name++;
	} else {
		mode_name = muxname;
	}

	list_for_each_entry(e, &muxmodes, node) {
		struct omap_mux *m = &e->mux;
		char *m0_entry = m->muxnames[0];
		int i;

		/* First check for full name in mode0.muxmode format */
		if (mode0_len && strncmp(muxname, m0_entry, mode0_len))
			continue;

		/* Then check for muxmode only */
		for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
			char *mode_cur = m->muxnames[i];

			if (!mode_cur)
				continue;

			if (!strcmp(mode_name, mode_cur)) {
				u16 old_mode;
				u16 mux_mode;

				old_mode = omap_mux_read(m->reg_offset);
				mux_mode = val | i;
				printk(KERN_DEBUG "mux: Setting signal "
					"%s.%s 0x%04x -> 0x%04x\n",
					m0_entry, muxname, old_mode, mux_mode);
				omap_mux_write(mux_mode, m->reg_offset);
				found++;
			}
		}
	}

	if (found == 1)
		return 0;

	if (found > 1) {
		printk(KERN_ERR "mux: Multiple signal paths (%i) for %s\n",
				found, muxname);
		return -EINVAL;
	}

	printk(KERN_ERR "mux: Could not set signal %s\n", muxname);

	return -ENODEV;
}

#ifdef CONFIG_DEBUG_FS

#define OMAP_MUX_MAX_NR_FLAGS	10
#define OMAP_MUX_TEST_FLAG(val, mask)				\
	if (((val) & (mask)) == (mask)) {			\
		i++;						\
		flags[i] =  #mask;				\
	}

/* REVISIT: Add checking for non-optimal mux settings */
static inline void omap_mux_decode(struct seq_file *s, u16 val)
{
	char *flags[OMAP_MUX_MAX_NR_FLAGS];
	char mode[sizeof("OMAP_MUX_MODE") + 1];
	int i = -1;

	sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7);
	i++;
	flags[i] = mode;

	OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE);
	if (val & OMAP_OFF_EN) {
		if (!(val & OMAP_OFFOUT_EN)) {
			if (!(val & OMAP_OFF_PULL_UP)) {
				OMAP_MUX_TEST_FLAG(val,
					OMAP_PIN_OFF_INPUT_PULLDOWN);
			} else {
				OMAP_MUX_TEST_FLAG(val,
					OMAP_PIN_OFF_INPUT_PULLUP);
			}
		} else {
			if (!(val & OMAP_OFFOUT_VAL)) {
				OMAP_MUX_TEST_FLAG(val,
					OMAP_PIN_OFF_OUTPUT_LOW);
			} else {
				OMAP_MUX_TEST_FLAG(val,
					OMAP_PIN_OFF_OUTPUT_HIGH);
			}
		}
	}

	if (val & OMAP_INPUT_EN) {
		if (val & OMAP_PULL_ENA) {
			if (!(val & OMAP_PULL_UP)) {
				OMAP_MUX_TEST_FLAG(val,
					OMAP_PIN_INPUT_PULLDOWN);
			} else {
				OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP);
			}
		} else {
			OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT);
		}
	} else {
		i++;
		flags[i] = "OMAP_PIN_OUTPUT";
	}

	do {
		seq_printf(s, "%s", flags[i]);
		if (i > 0)
			seq_printf(s, " | ");
	} while (i-- > 0);
}

#define OMAP_MUX_DEFNAME_LEN	16

static int omap_mux_dbg_board_show(struct seq_file *s, void *unused)
{
	struct omap_mux_entry *e;

	list_for_each_entry(e, &muxmodes, node) {
		struct omap_mux *m = &e->mux;
		char m0_def[OMAP_MUX_DEFNAME_LEN];
		char *m0_name = m->muxnames[0];
		u16 val;
		int i, mode;

		if (!m0_name)
			continue;

		/* REVISIT: Needs to be updated if mode0 names get longer */
		for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) {
			if (m0_name[i] == '\0') {
				m0_def[i] = m0_name[i];
				break;
			}
			m0_def[i] = toupper(m0_name[i]);
		}
		val = omap_mux_read(m->reg_offset);
		mode = val & OMAP_MUX_MODE7;

		seq_printf(s, "OMAP%i_MUX(%s, ",
					cpu_is_omap34xx() ? 3 : 0, m0_def);
		omap_mux_decode(s, val);
		seq_printf(s, "),\n");
	}

	return 0;
}

static int omap_mux_dbg_board_open(struct inode *inode, struct file *file)
{
	return single_open(file, omap_mux_dbg_board_show, &inode->i_private);
}

static const struct file_operations omap_mux_dbg_board_fops = {
	.open		= omap_mux_dbg_board_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int omap_mux_dbg_signal_show(struct seq_file *s, void *unused)
{
	struct omap_mux *m = s->private;
	const char *none = "NA";
	u16 val;
	int mode;

	val = omap_mux_read(m->reg_offset);
	mode = val & OMAP_MUX_MODE7;

	seq_printf(s, "name: %s.%s (0x%08lx/0x%03x = 0x%04x), b %s, t %s\n",
			m->muxnames[0], m->muxnames[mode],
			mux_phys + m->reg_offset, m->reg_offset, val,
			m->balls[0] ? m->balls[0] : none,
			m->balls[1] ? m->balls[1] : none);
	seq_printf(s, "mode: ");
	omap_mux_decode(s, val);
	seq_printf(s, "\n");
	seq_printf(s, "signals: %s | %s | %s | %s | %s | %s | %s | %s\n",
			m->muxnames[0] ? m->muxnames[0] : none,
			m->muxnames[1] ? m->muxnames[1] : none,
			m->muxnames[2] ? m->muxnames[2] : none,
			m->muxnames[3] ? m->muxnames[3] : none,
			m->muxnames[4] ? m->muxnames[4] : none,
			m->muxnames[5] ? m->muxnames[5] : none,
			m->muxnames[6] ? m->muxnames[6] : none,
			m->muxnames[7] ? m->muxnames[7] : none);

	return 0;
}

#define OMAP_MUX_MAX_ARG_CHAR  7

static ssize_t omap_mux_dbg_signal_write(struct file *file,
						const char __user *user_buf,
						size_t count, loff_t *ppos)
{
	char buf[OMAP_MUX_MAX_ARG_CHAR];
	struct seq_file *seqf;
	struct omap_mux *m;
	unsigned long val;
	int buf_size, ret;

	if (count > OMAP_MUX_MAX_ARG_CHAR)
		return -EINVAL;

	memset(buf, 0, sizeof(buf));
	buf_size = min(count, sizeof(buf) - 1);

	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;

	ret = strict_strtoul(buf, 0x10, &val);
	if (ret < 0)
		return ret;

	if (val > 0xffff)
		return -EINVAL;

	seqf = file->private_data;
	m = seqf->private;

	omap_mux_write((u16)val, m->reg_offset);
	*ppos += count;

	return count;
}

static int omap_mux_dbg_signal_open(struct inode *inode, struct file *file)
{
	return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
}

static const struct file_operations omap_mux_dbg_signal_fops = {
	.open		= omap_mux_dbg_signal_open,
	.read		= seq_read,
	.write		= omap_mux_dbg_signal_write,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static struct dentry *mux_dbg_dir;

static void __init omap_mux_dbg_init(void)
{
	struct omap_mux_entry *e;

	mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
	if (!mux_dbg_dir)
		return;

	(void)debugfs_create_file("board", S_IRUGO, mux_dbg_dir,
					NULL, &omap_mux_dbg_board_fops);

	list_for_each_entry(e, &muxmodes, node) {
		struct omap_mux *m = &e->mux;

		(void)debugfs_create_file(m->muxnames[0], S_IWUGO, mux_dbg_dir,
					m, &omap_mux_dbg_signal_fops);
	}
}

#else
static inline void omap_mux_dbg_init(void)
{
}
#endif	/* CONFIG_DEBUG_FS */

static void __init omap_mux_free_names(struct omap_mux *m)
{
	int i;

	for (i = 0; i < OMAP_MUX_NR_MODES; i++)
		kfree(m->muxnames[i]);

#ifdef CONFIG_DEBUG_FS
	for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
		kfree(m->balls[i]);
#endif

}

/* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
static int __init omap_mux_late_init(void)
{
	struct omap_mux_entry *e, *tmp;

	list_for_each_entry_safe(e, tmp, &muxmodes, node) {
		struct omap_mux *m = &e->mux;
		u16 mode = omap_mux_read(m->reg_offset);

		if (OMAP_MODE_GPIO(mode))
			continue;

#ifndef CONFIG_DEBUG_FS
		mutex_lock(&muxmode_mutex);
		list_del(&e->node);
		mutex_unlock(&muxmode_mutex);
		omap_mux_free_names(m);
		kfree(m);
#endif

	}

	omap_mux_dbg_init();

	return 0;
}
late_initcall(omap_mux_late_init);

static void __init omap_mux_package_fixup(struct omap_mux *p,
					struct omap_mux *superset)
{
	while (p->reg_offset !=  OMAP_MUX_TERMINATOR) {
		struct omap_mux *s = superset;
		int found = 0;

		while (s->reg_offset != OMAP_MUX_TERMINATOR) {
			if (s->reg_offset == p->reg_offset) {
				*s = *p;
				found++;
				break;
			}
			s++;
		}
		if (!found)
			printk(KERN_ERR "mux: Unknown entry offset 0x%x\n",
					p->reg_offset);
		p++;
	}
}

#ifdef CONFIG_DEBUG_FS

static void __init omap_mux_package_init_balls(struct omap_ball *b,
				struct omap_mux *superset)
{
	while (b->reg_offset != OMAP_MUX_TERMINATOR) {
		struct omap_mux *s = superset;
		int found = 0;

		while (s->reg_offset != OMAP_MUX_TERMINATOR) {
			if (s->reg_offset == b->reg_offset) {
				s->balls[0] = b->balls[0];
				s->balls[1] = b->balls[1];
				found++;
				break;
			}
			s++;
		}
		if (!found)
			printk(KERN_ERR "mux: Unknown ball offset 0x%x\n",
					b->reg_offset);
		b++;
	}
}

#else	/* CONFIG_DEBUG_FS */

static inline void omap_mux_package_init_balls(struct omap_ball *b,
					struct omap_mux *superset)
{
}

#endif	/* CONFIG_DEBUG_FS */

static int __init omap_mux_setup(char *options)
{
	if (!options)
		return 0;

	omap_mux_options = options;

	return 1;
}
__setup("omap_mux=", omap_mux_setup);

/*
 * Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
 * cmdline options only override the bootloader values.
 * During development, please enable CONFIG_DEBUG_FS, and use the
 * signal specific entries under debugfs.
 */
static void __init omap_mux_set_cmdline_signals(void)
{
	char *options, *next_opt, *token;

	if (!omap_mux_options)
		return;

	options = kmalloc(strlen(omap_mux_options) + 1, GFP_KERNEL);
	if (!options)
		return;

	strcpy(options, omap_mux_options);
	next_opt = options;

	while ((token = strsep(&next_opt, ",")) != NULL) {
		char *keyval, *name;
		unsigned long val;

		keyval = token;
		name = strsep(&keyval, "=");
		if (name) {
			int res;

			res = strict_strtoul(keyval, 0x10, &val);
			if (res < 0)
				continue;

			omap_mux_init_signal(name, (u16)val);
		}
	}

	kfree(options);
}

static int __init omap_mux_copy_names(struct omap_mux *src,
					struct omap_mux *dst)
{
	int i;

	for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
		if (src->muxnames[i]) {
			dst->muxnames[i] =
				kmalloc(strlen(src->muxnames[i]) + 1,
					GFP_KERNEL);
			if (!dst->muxnames[i])
				goto free;
			strcpy(dst->muxnames[i], src->muxnames[i]);
		}
	}

#ifdef CONFIG_DEBUG_FS
	for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
		if (src->balls[i]) {
			dst->balls[i] =
				kmalloc(strlen(src->balls[i]) + 1,
					GFP_KERNEL);
			if (!dst->balls[i])
				goto free;
			strcpy(dst->balls[i], src->balls[i]);
		}
	}
#endif

	return 0;

free:
	omap_mux_free_names(dst);
	return -ENOMEM;

}

#endif	/* CONFIG_OMAP_MUX */

static u16 omap_mux_get_by_gpio(int gpio)
{
	struct omap_mux_entry *e;
	u16 offset = OMAP_MUX_TERMINATOR;

	list_for_each_entry(e, &muxmodes, node) {
		struct omap_mux *m = &e->mux;
		if (m->gpio == gpio) {
			offset = m->reg_offset;
			break;
		}
	}

	return offset;
}

/* Needed for dynamic muxing of GPIO pins for off-idle */
u16 omap_mux_get_gpio(int gpio)
{
	u16 offset;

	offset = omap_mux_get_by_gpio(gpio);
	if (offset == OMAP_MUX_TERMINATOR) {
		printk(KERN_ERR "mux: Could not get gpio%i\n", gpio);
		return offset;
	}

	return omap_mux_read(offset);
}

/* Needed for dynamic muxing of GPIO pins for off-idle */
void omap_mux_set_gpio(u16 val, int gpio)
{
	u16 offset;

	offset = omap_mux_get_by_gpio(gpio);
	if (offset == OMAP_MUX_TERMINATOR) {
		printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
		return;
	}

	omap_mux_write(val, offset);
}

static struct omap_mux * __init omap_mux_list_add(struct omap_mux *src)
{
	struct omap_mux_entry *entry;
	struct omap_mux *m;

	entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
	if (!entry)
		return NULL;

	m = &entry->mux;
	memcpy(m, src, sizeof(struct omap_mux_entry));

#ifdef CONFIG_OMAP_MUX
	if (omap_mux_copy_names(src, m)) {
		kfree(entry);
		return NULL;
	}
#endif

	mutex_lock(&muxmode_mutex);
	list_add_tail(&entry->node, &muxmodes);
	mutex_unlock(&muxmode_mutex);

	return m;
}

/*
 * Note if CONFIG_OMAP_MUX is not selected, we will only initialize
 * the GPIO to mux offset mapping that is needed for dynamic muxing
 * of GPIO pins for off-idle.
 */
static void __init omap_mux_init_list(struct omap_mux *superset)
{
	while (superset->reg_offset !=  OMAP_MUX_TERMINATOR) {
		struct omap_mux *entry;

#ifdef CONFIG_OMAP_MUX
		if (!superset->muxnames || !superset->muxnames[0]) {
			superset++;
			continue;
		}
#else
		/* Skip pins that are not muxed as GPIO by bootloader */
		if (!OMAP_MODE_GPIO(omap_mux_read(superset->reg_offset))) {
			superset++;
			continue;
		}
#endif

		entry = omap_mux_list_add(superset);
		if (!entry) {
			printk(KERN_ERR "mux: Could not add entry\n");
			return;
		}
		superset++;
	}
}

#ifdef CONFIG_OMAP_MUX

static void omap_mux_init_package(struct omap_mux *superset,
				  struct omap_mux *package_subset,
				  struct omap_ball *package_balls)
{
	if (package_subset)
		omap_mux_package_fixup(package_subset, superset);
	if (package_balls)
		omap_mux_package_init_balls(package_balls, superset);
}

static void omap_mux_init_signals(struct omap_board_mux *board_mux)
{
	omap_mux_set_cmdline_signals();
	omap_mux_write_array(board_mux);
}

#else

static void omap_mux_init_package(struct omap_mux *superset,
				  struct omap_mux *package_subset,
				  struct omap_ball *package_balls)
{
}

static void omap_mux_init_signals(struct omap_board_mux *board_mux)
{
}

#endif

int __init omap_mux_init(u32 mux_pbase, u32 mux_size,
				struct omap_mux *superset,
				struct omap_mux *package_subset,
				struct omap_board_mux *board_mux,
				struct omap_ball *package_balls)
{
	if (mux_base)
		return -EBUSY;

	mux_phys = mux_pbase;
	mux_base = ioremap(mux_pbase, mux_size);
	if (!mux_base) {
		printk(KERN_ERR "mux: Could not ioremap\n");
		return -ENODEV;
	}

	if (cpu_is_omap24xx())
		omap_mux_flags = MUXABLE_GPIO_MODE3;

	omap_mux_init_package(superset, package_subset, package_balls);
	omap_mux_init_list(superset);
	omap_mux_init_signals(board_mux);

	return 0;
}
Commit	Line	Data
1dbae815 TL	1	/*
	2	* linux/arch/arm/mach-omap2/mux.c
	3	*
2351872c	4	* OMAP2 and OMAP3 pin multiplexing configurations
1dbae815	5	*
9330899e TL	6	* Copyright (C) 2004 - 2008 Texas Instruments Inc.
9330899e TL	7	* Copyright (C) 2003 - 2008 Nokia Corporation
1dbae815	8	*
9330899e	9	* Written by Tony Lindgren
1dbae815 TL	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	24	*
	25	*/
4814ced5	26	#include <linux/kernel.h>
1dbae815	27	#include <linux/init.h>
fced80c7	28	#include <linux/io.h>
15ac7afe	29	#include <linux/list.h>
4814ced5	30	#include <linux/slab.h>
4b715efc TL	31	#include <linux/ctype.h>
	32	#include <linux/debugfs.h>
	33	#include <linux/seq_file.h>
	34	#include <linux/uaccess.h>
1dbae815	35
fced80c7 RK	36	#include <asm/system.h>
fced80c7 RK	37
4814ced5	38	#include "control.h"
15ac7afe	39	#include "mux.h"
1dbae815	40
92c9f501 MR	41	#define OMAP_MUX_BASE_OFFSET 0x30 /* Offset from CTRL_BASE */
92c9f501 MR	42	#define OMAP_MUX_BASE_SZ 0x5ca
d5425be6	43	#define MUXABLE_GPIO_MODE3 BIT(0)
92c9f501	44
15ac7afe TL	45	struct omap_mux_entry {
	46	struct omap_mux mux;
	47	struct list_head node;
	48	};
	49
4b715efc	50	static unsigned long mux_phys;
92c9f501	51	static void __iomem *mux_base;
d5425be6	52	static u8 omap_mux_flags;
92c9f501	53
d4bb72e5	54	u16 omap_mux_read(u16 reg)
92c9f501 MR	55	{
	56	if (cpu_is_omap24xx())
	57	return __raw_readb(mux_base + reg);
	58	else
	59	return __raw_readw(mux_base + reg);
	60	}
	61
d4bb72e5	62	void omap_mux_write(u16 val, u16 reg)
92c9f501 MR	63	{
	64	if (cpu_is_omap24xx())
	65	__raw_writeb(val, mux_base + reg);
	66	else
	67	__raw_writew(val, mux_base + reg);
	68	}
7d7f665d	69
d4bb72e5 TL	70	void omap_mux_write_array(struct omap_board_mux *board_mux)
	71	{
	72	while (board_mux->reg_offset != OMAP_MUX_TERMINATOR) {
	73	omap_mux_write(board_mux->value, board_mux->reg_offset);
	74	board_mux++;
	75	}
	76	}
	77
15ac7afe TL	78	static LIST_HEAD(muxmodes);
	79	static DEFINE_MUTEX(muxmode_mutex);
	80
	81	#ifdef CONFIG_OMAP_MUX
	82
	83	static char *omap_mux_options;
	84
	85	int __init omap_mux_init_gpio(int gpio, int val)
	86	{
	87	struct omap_mux_entry *e;
ca828760	88	struct omap_mux *gpio_mux = NULL;
8a6f7e14 GI	89	u16 old_mode;
8a6f7e14 GI	90	u16 mux_mode;
15ac7afe TL	91	int found = 0;
	92
	93	if (!gpio)
	94	return -EINVAL;
	95
	96	list_for_each_entry(e, &muxmodes, node) {
	97	struct omap_mux *m = &e->mux;
	98	if (gpio == m->gpio) {
8a6f7e14	99	gpio_mux = m;
15ac7afe TL	100	found++;
	101	}
	102	}
	103
8a6f7e14 GI	104	if (found == 0) {
	105	printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
	106	return -ENODEV;
	107	}
15ac7afe TL	108
15ac7afe TL	109	if (found > 1) {
8a6f7e14 GI	110	printk(KERN_INFO "mux: Multiple gpio paths (%d) for gpio%i\n",
8a6f7e14 GI	111	found, gpio);
15ac7afe TL	112	return -EINVAL;
	113	}
	114
8a6f7e14 GI	115	old_mode = omap_mux_read(gpio_mux->reg_offset);
	116	mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
	117	if (omap_mux_flags & MUXABLE_GPIO_MODE3)
	118	mux_mode \|= OMAP_MUX_MODE3;
	119	else
	120	mux_mode \|= OMAP_MUX_MODE4;
	121	printk(KERN_DEBUG "mux: Setting signal %s.gpio%i 0x%04x -> 0x%04x\n",
	122	gpio_mux->muxnames[0], gpio, old_mode, mux_mode);
	123	omap_mux_write(mux_mode, gpio_mux->reg_offset);
15ac7afe	124
8a6f7e14	125	return 0;
15ac7afe TL	126	}
15ac7afe TL	127
5a3b2f7a	128	int __init omap_mux_init_signal(const char *muxname, int val)
15ac7afe TL	129	{
15ac7afe TL	130	struct omap_mux_entry *e;
5a3b2f7a TL	131	const char *mode_name;
5a3b2f7a TL	132	int found = 0, mode0_len = 0;
15ac7afe TL	133
	134	mode_name = strchr(muxname, '.');
	135	if (mode_name) {
5a3b2f7a	136	mode0_len = strlen(muxname) - strlen(mode_name);
15ac7afe	137	mode_name++;
15ac7afe TL	138	} else {
	139	mode_name = muxname;
	140	}
	141
	142	list_for_each_entry(e, &muxmodes, node) {
	143	struct omap_mux *m = &e->mux;
	144	char *m0_entry = m->muxnames[0];
	145	int i;
	146
5a3b2f7a TL	147	/* First check for full name in mode0.muxmode format */
5a3b2f7a TL	148	if (mode0_len && strncmp(muxname, m0_entry, mode0_len))
15ac7afe TL	149	continue;
15ac7afe TL	150
5a3b2f7a	151	/* Then check for muxmode only */
15ac7afe TL	152	for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
	153	char *mode_cur = m->muxnames[i];
	154
	155	if (!mode_cur)
	156	continue;
	157
	158	if (!strcmp(mode_name, mode_cur)) {
	159	u16 old_mode;
	160	u16 mux_mode;
	161
	162	old_mode = omap_mux_read(m->reg_offset);
	163	mux_mode = val \| i;
	164	printk(KERN_DEBUG "mux: Setting signal "
	165	"%s.%s 0x%04x -> 0x%04x\n",
	166	m0_entry, muxname, old_mode, mux_mode);
	167	omap_mux_write(mux_mode, m->reg_offset);
	168	found++;
	169	}
	170	}
	171	}
	172
	173	if (found == 1)
	174	return 0;
	175
	176	if (found > 1) {
	177	printk(KERN_ERR "mux: Multiple signal paths (%i) for %s\n",
	178	found, muxname);
	179	return -EINVAL;
	180	}
	181
	182	printk(KERN_ERR "mux: Could not set signal %s\n", muxname);
	183
	184	return -ENODEV;
	185	}
	186
4b715efc TL	187	#ifdef CONFIG_DEBUG_FS
	188
	189	#define OMAP_MUX_MAX_NR_FLAGS 10
	190	#define OMAP_MUX_TEST_FLAG(val, mask) \
	191	if (((val) & (mask)) == (mask)) { \
	192	i++; \
	193	flags[i] = #mask; \
	194	}
	195
	196	/* REVISIT: Add checking for non-optimal mux settings */
	197	static inline void omap_mux_decode(struct seq_file *s, u16 val)
	198	{
	199	char *flags[OMAP_MUX_MAX_NR_FLAGS];
78737ae1	200	char mode[sizeof("OMAP_MUX_MODE") + 1];
4b715efc TL	201	int i = -1;
	202
	203	sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7);
	204	i++;
	205	flags[i] = mode;
	206
	207	OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE);
	208	if (val & OMAP_OFF_EN) {
	209	if (!(val & OMAP_OFFOUT_EN)) {
	210	if (!(val & OMAP_OFF_PULL_UP)) {
	211	OMAP_MUX_TEST_FLAG(val,
	212	OMAP_PIN_OFF_INPUT_PULLDOWN);
	213	} else {
	214	OMAP_MUX_TEST_FLAG(val,
	215	OMAP_PIN_OFF_INPUT_PULLUP);
	216	}
	217	} else {
	218	if (!(val & OMAP_OFFOUT_VAL)) {
	219	OMAP_MUX_TEST_FLAG(val,
	220	OMAP_PIN_OFF_OUTPUT_LOW);
	221	} else {
	222	OMAP_MUX_TEST_FLAG(val,
	223	OMAP_PIN_OFF_OUTPUT_HIGH);
	224	}
	225	}
	226	}
	227
	228	if (val & OMAP_INPUT_EN) {
	229	if (val & OMAP_PULL_ENA) {
	230	if (!(val & OMAP_PULL_UP)) {
	231	OMAP_MUX_TEST_FLAG(val,
	232	OMAP_PIN_INPUT_PULLDOWN);
	233	} else {
	234	OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP);
	235	}
	236	} else {
	237	OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT);
	238	}
	239	} else {
	240	i++;
	241	flags[i] = "OMAP_PIN_OUTPUT";
	242	}
	243
	244	do {
	245	seq_printf(s, "%s", flags[i]);
	246	if (i > 0)
	247	seq_printf(s, " \| ");
	248	} while (i-- > 0);
	249	}
	250
	251	#define OMAP_MUX_DEFNAME_LEN 16
	252
	253	static int omap_mux_dbg_board_show(struct seq_file s, void unused)
	254	{
	255	struct omap_mux_entry *e;
	256
	257	list_for_each_entry(e, &muxmodes, node) {
	258	struct omap_mux *m = &e->mux;
	259	char m0_def[OMAP_MUX_DEFNAME_LEN];
	260	char *m0_name = m->muxnames[0];
	261	u16 val;
	262	int i, mode;
	263
	264	if (!m0_name)
265	continue;
266
78737ae1	267	/* REVISIT: Needs to be updated if mode0 names get longer */
4b715efc TL	268	for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) {
	269	if (m0_name[i] == '\0') {
	270	m0_def[i] = m0_name[i];
	271	break;
	272	}
	273	m0_def[i] = toupper(m0_name[i]);
	274	}
	275	val = omap_mux_read(m->reg_offset);
	276	mode = val & OMAP_MUX_MODE7;
	277
	278	seq_printf(s, "OMAP%i_MUX(%s, ",
	279	cpu_is_omap34xx() ? 3 : 0, m0_def);
	280	omap_mux_decode(s, val);
	281	seq_printf(s, "),\n");
	282	}
	283
	284	return 0;
	285	}
	286
	287	static int omap_mux_dbg_board_open(struct inode inode, struct file file)
	288	{
	289	return single_open(file, omap_mux_dbg_board_show, &inode->i_private);
	290	}
	291
	292	static const struct file_operations omap_mux_dbg_board_fops = {
	293	.open = omap_mux_dbg_board_open,
	294	.read = seq_read,
	295	.llseek = seq_lseek,
	296	.release = single_release,
	297	};
	298
	299	static int omap_mux_dbg_signal_show(struct seq_file s, void unused)
	300	{
	301	struct omap_mux *m = s->private;
	302	const char *none = "NA";
	303	u16 val;
	304	int mode;
	305
	306	val = omap_mux_read(m->reg_offset);
	307	mode = val & OMAP_MUX_MODE7;
	308
	309	seq_printf(s, "name: %s.%s (0x%08lx/0x%03x = 0x%04x), b %s, t %s\n",
	310	m->muxnames[0], m->muxnames[mode],
	311	mux_phys + m->reg_offset, m->reg_offset, val,
	312	m->balls[0] ? m->balls[0] : none,
	313	m->balls[1] ? m->balls[1] : none);
	314	seq_printf(s, "mode: ");
	315	omap_mux_decode(s, val);
	316	seq_printf(s, "\n");
	317	seq_printf(s, "signals: %s \| %s \| %s \| %s \| %s \| %s \| %s \| %s\n",
	318	m->muxnames[0] ? m->muxnames[0] : none,
	319	m->muxnames[1] ? m->muxnames[1] : none,
	320	m->muxnames[2] ? m->muxnames[2] : none,
	321	m->muxnames[3] ? m->muxnames[3] : none,
	322	m->muxnames[4] ? m->muxnames[4] : none,
	323	m->muxnames[5] ? m->muxnames[5] : none,
	324	m->muxnames[6] ? m->muxnames[6] : none,
	325	m->muxnames[7] ? m->muxnames[7] : none);
	326
	327	return 0;
	328	}
	329
	330	#define OMAP_MUX_MAX_ARG_CHAR 7
	331
332	static ssize_t omap_mux_dbg_signal_write(struct file *file,
333	const char __user *user_buf,
334	size_t count, loff_t *ppos)
335	{
336	char buf[OMAP_MUX_MAX_ARG_CHAR];
337	struct seq_file *seqf;
338	struct omap_mux *m;
339	unsigned long val;
340	int buf_size, ret;
341
342	if (count > OMAP_MUX_MAX_ARG_CHAR)
343	return -EINVAL;
344
345	memset(buf, 0, sizeof(buf));
346	buf_size = min(count, sizeof(buf) - 1);
347
348	if (copy_from_user(buf, user_buf, buf_size))
349	return -EFAULT;
350
351	ret = strict_strtoul(buf, 0x10, &val);
352	if (ret < 0)
353	return ret;
354
355	if (val > 0xffff)
356	return -EINVAL;
357
358	seqf = file->private_data;
359	m = seqf->private;
360
361	omap_mux_write((u16)val, m->reg_offset);
362	*ppos += count;
363
364	return count;
365	}
366
367	static int omap_mux_dbg_signal_open(struct inode inode, struct file file)
368	{
369	return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
370	}
371
372	static const struct file_operations omap_mux_dbg_signal_fops = {
373	.open = omap_mux_dbg_signal_open,
374	.read = seq_read,
375	.write = omap_mux_dbg_signal_write,
376	.llseek = seq_lseek,
377	.release = single_release,
378	};
379
380	static struct dentry *mux_dbg_dir;
381
382	static void __init omap_mux_dbg_init(void)
383	{
384	struct omap_mux_entry *e;
385
386	mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
387	if (!mux_dbg_dir)
388	return;
389
390	(void)debugfs_create_file("board", S_IRUGO, mux_dbg_dir,
391	NULL, &omap_mux_dbg_board_fops);
392
393	list_for_each_entry(e, &muxmodes, node) {
394	struct omap_mux *m = &e->mux;
395
396	(void)debugfs_create_file(m->muxnames[0], S_IWUGO, mux_dbg_dir,
397	m, &omap_mux_dbg_signal_fops);
398	}
399	}
400
401	#else
402	static inline void omap_mux_dbg_init(void)
403	{
404	}
405	#endif /* CONFIG_DEBUG_FS */
406
15ac7afe TL	407	static void __init omap_mux_free_names(struct omap_mux *m)
	408	{
	409	int i;
	410
	411	for (i = 0; i < OMAP_MUX_NR_MODES; i++)
	412	kfree(m->muxnames[i]);
	413
	414	#ifdef CONFIG_DEBUG_FS
	415	for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
	416	kfree(m->balls[i]);
	417	#endif
	418
	419	}
	420
	421	/* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
	422	static int __init omap_mux_late_init(void)
	423	{
	424	struct omap_mux_entry e, tmp;
	425
	426	list_for_each_entry_safe(e, tmp, &muxmodes, node) {
	427	struct omap_mux *m = &e->mux;
	428	u16 mode = omap_mux_read(m->reg_offset);
	429
	430	if (OMAP_MODE_GPIO(mode))
	431	continue;
	432
	433	#ifndef CONFIG_DEBUG_FS
	434	mutex_lock(&muxmode_mutex);
	435	list_del(&e->node);
	436	mutex_unlock(&muxmode_mutex);
	437	omap_mux_free_names(m);
	438	kfree(m);
1dbae815	439	#endif
15ac7afe TL	440
	441	}
	442
4b715efc TL	443	omap_mux_dbg_init();
4b715efc TL	444
15ac7afe TL	445	return 0;
	446	}
	447	late_initcall(omap_mux_late_init);
	448
	449	static void __init omap_mux_package_fixup(struct omap_mux *p,
	450	struct omap_mux *superset)
	451	{
	452	while (p->reg_offset != OMAP_MUX_TERMINATOR) {
	453	struct omap_mux *s = superset;
	454	int found = 0;
	455
	456	while (s->reg_offset != OMAP_MUX_TERMINATOR) {
	457	if (s->reg_offset == p->reg_offset) {
	458	s = p;
	459	found++;
	460	break;
	461	}
	462	s++;
	463	}
	464	if (!found)
	465	printk(KERN_ERR "mux: Unknown entry offset 0x%x\n",
	466	p->reg_offset);
	467	p++;
	468	}
	469	}
	470
	471	#ifdef CONFIG_DEBUG_FS
	472
	473	static void __init omap_mux_package_init_balls(struct omap_ball *b,
	474	struct omap_mux *superset)
	475	{
	476	while (b->reg_offset != OMAP_MUX_TERMINATOR) {
	477	struct omap_mux *s = superset;
	478	int found = 0;
	479
	480	while (s->reg_offset != OMAP_MUX_TERMINATOR) {
	481	if (s->reg_offset == b->reg_offset) {
	482	s->balls[0] = b->balls[0];
	483	s->balls[1] = b->balls[1];
	484	found++;
	485	break;
	486	}
	487	s++;
	488	}
	489	if (!found)
	490	printk(KERN_ERR "mux: Unknown ball offset 0x%x\n",
	491	b->reg_offset);
	492	b++;
	493	}
	494	}
	495
	496	#else /* CONFIG_DEBUG_FS */
	497
	498	static inline void omap_mux_package_init_balls(struct omap_ball *b,
	499	struct omap_mux *superset)
	500	{
	501	}
	502
	503	#endif /* CONFIG_DEBUG_FS */
	504
	505	static int __init omap_mux_setup(char *options)
	506	{
	507	if (!options)
	508	return 0;
509
510	omap_mux_options = options;
511
512	return 1;
513	}
514	__setup("omap_mux=", omap_mux_setup);
515
516	/*
517	* Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
518	* cmdline options only override the bootloader values.
519	* During development, please enable CONFIG_DEBUG_FS, and use the
520	* signal specific entries under debugfs.
521	*/
522	static void __init omap_mux_set_cmdline_signals(void)
523	{
524	char options, next_opt, *token;
525
526	if (!omap_mux_options)
527	return;
528
529	options = kmalloc(strlen(omap_mux_options) + 1, GFP_KERNEL);
530	if (!options)
531	return;
532
533	strcpy(options, omap_mux_options);
534	next_opt = options;
535
536	while ((token = strsep(&next_opt, ",")) != NULL) {
537	char keyval, name;
538	unsigned long val;
539
540	keyval = token;
541	name = strsep(&keyval, "=");
542	if (name) {
543	int res;
544
545	res = strict_strtoul(keyval, 0x10, &val);
546	if (res < 0)
547	continue;
548
549	omap_mux_init_signal(name, (u16)val);
550	}
551	}
552
553	kfree(options);
554	}
555
15ac7afe TL	556	static int __init omap_mux_copy_names(struct omap_mux *src,
	557	struct omap_mux *dst)
	558	{
	559	int i;
	560
	561	for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
	562	if (src->muxnames[i]) {
	563	dst->muxnames[i] =
	564	kmalloc(strlen(src->muxnames[i]) + 1,
	565	GFP_KERNEL);
	566	if (!dst->muxnames[i])
	567	goto free;
	568	strcpy(dst->muxnames[i], src->muxnames[i]);
	569	}
	570	}
	571
	572	#ifdef CONFIG_DEBUG_FS
	573	for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
	574	if (src->balls[i]) {
	575	dst->balls[i] =
	576	kmalloc(strlen(src->balls[i]) + 1,
	577	GFP_KERNEL);
	578	if (!dst->balls[i])
	579	goto free;
	580	strcpy(dst->balls[i], src->balls[i]);
	581	}
	582	}
	583	#endif
	584
	585	return 0;
	586
	587	free:
	588	omap_mux_free_names(dst);
	589	return -ENOMEM;
	590
	591	}
	592
	593	#endif /* CONFIG_OMAP_MUX */
	594
	595	static u16 omap_mux_get_by_gpio(int gpio)
	596	{
	597	struct omap_mux_entry *e;
	598	u16 offset = OMAP_MUX_TERMINATOR;
	599
	600	list_for_each_entry(e, &muxmodes, node) {
	601	struct omap_mux *m = &e->mux;
	602	if (m->gpio == gpio) {
	603	offset = m->reg_offset;
	604	break;
	605	}
	606	}
	607
	608	return offset;
	609	}
	610
	611	/* Needed for dynamic muxing of GPIO pins for off-idle */
	612	u16 omap_mux_get_gpio(int gpio)
	613	{
	614	u16 offset;
	615
	616	offset = omap_mux_get_by_gpio(gpio);
	617	if (offset == OMAP_MUX_TERMINATOR) {
	618	printk(KERN_ERR "mux: Could not get gpio%i\n", gpio);
	619	return offset;
620	}
621
622	return omap_mux_read(offset);
623	}
624
625	/* Needed for dynamic muxing of GPIO pins for off-idle */
626	void omap_mux_set_gpio(u16 val, int gpio)
627	{
628	u16 offset;
629
630	offset = omap_mux_get_by_gpio(gpio);
631	if (offset == OMAP_MUX_TERMINATOR) {
632	printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
633	return;
634	}
635
636	omap_mux_write(val, offset);
637	}
638
639	static struct omap_mux * __init omap_mux_list_add(struct omap_mux *src)
640	{
641	struct omap_mux_entry *entry;
642	struct omap_mux *m;
643
644	entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
645	if (!entry)
646	return NULL;
647
648	m = &entry->mux;
649	memcpy(m, src, sizeof(struct omap_mux_entry));
650
651	#ifdef CONFIG_OMAP_MUX
652	if (omap_mux_copy_names(src, m)) {
653	kfree(entry);
654	return NULL;
655	}
656	#endif
657
658	mutex_lock(&muxmode_mutex);
659	list_add_tail(&entry->node, &muxmodes);
660	mutex_unlock(&muxmode_mutex);
661
662	return m;
663	}
664
665	/*
666	* Note if CONFIG_OMAP_MUX is not selected, we will only initialize
667	* the GPIO to mux offset mapping that is needed for dynamic muxing
668	* of GPIO pins for off-idle.
669	*/
670	static void __init omap_mux_init_list(struct omap_mux *superset)
671	{
672	while (superset->reg_offset != OMAP_MUX_TERMINATOR) {
673	struct omap_mux *entry;
674
b72c7d54 RL	675	#ifdef CONFIG_OMAP_MUX
b72c7d54 RL	676	if (!superset->muxnames \|\| !superset->muxnames[0]) {
15ac7afe TL	677	superset++;
	678	continue;
	679	}
b72c7d54 RL	680	#else
	681	/* Skip pins that are not muxed as GPIO by bootloader */
	682	if (!OMAP_MODE_GPIO(omap_mux_read(superset->reg_offset))) {
9ecef433 TL	683	superset++;
	684	continue;
	685	}
	686	#endif
	687
15ac7afe TL	688	entry = omap_mux_list_add(superset);
	689	if (!entry) {
	690	printk(KERN_ERR "mux: Could not add entry\n");
	691	return;
	692	}
	693	superset++;
	694	}
	695	}
	696
321cfc85 TL	697	#ifdef CONFIG_OMAP_MUX
	698
	699	static void omap_mux_init_package(struct omap_mux *superset,
	700	struct omap_mux *package_subset,
	701	struct omap_ball *package_balls)
	702	{
	703	if (package_subset)
	704	omap_mux_package_fixup(package_subset, superset);
	705	if (package_balls)
	706	omap_mux_package_init_balls(package_balls, superset);
	707	}
	708
	709	static void omap_mux_init_signals(struct omap_board_mux *board_mux)
	710	{
	711	omap_mux_set_cmdline_signals();
	712	omap_mux_write_array(board_mux);
	713	}
	714
	715	#else
	716
	717	static void omap_mux_init_package(struct omap_mux *superset,
	718	struct omap_mux *package_subset,
	719	struct omap_ball *package_balls)
	720	{
	721	}
	722
	723	static void omap_mux_init_signals(struct omap_board_mux *board_mux)
	724	{
	725	}
	726
	727	#endif
	728
15ac7afe TL	729	int __init omap_mux_init(u32 mux_pbase, u32 mux_size,
	730	struct omap_mux *superset,
	731	struct omap_mux *package_subset,
	732	struct omap_board_mux *board_mux,
	733	struct omap_ball *package_balls)
	734	{
	735	if (mux_base)
	736	return -EBUSY;
	737
4b715efc	738	mux_phys = mux_pbase;
15ac7afe TL	739	mux_base = ioremap(mux_pbase, mux_size);
	740	if (!mux_base) {
	741	printk(KERN_ERR "mux: Could not ioremap\n");
	742	return -ENODEV;
	743	}
	744
d5425be6 TL	745	if (cpu_is_omap24xx())
	746	omap_mux_flags = MUXABLE_GPIO_MODE3;
	747
321cfc85	748	omap_mux_init_package(superset, package_subset, package_balls);
15ac7afe	749	omap_mux_init_list(superset);
321cfc85	750	omap_mux_init_signals(board_mux);
2cb0c54f	751
15ac7afe TL	752	return 0;
	753	}
	754