[net-next-2.6.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/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>

#include <asm/system.h>

#include <plat/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;
	int found = 0;

	if (!gpio)
		return -EINVAL;

	list_for_each_entry(e, &muxmodes, node) {
		struct omap_mux *m = &e->mux;
		if (gpio == m->gpio) {
			u16 old_mode;
			u16 mux_mode;

			old_mode = omap_mux_read(m->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",
				m->muxnames[0], gpio, 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 gpio paths for gpio%i\n", gpio);
		return -EINVAL;
	}

	printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);

	return -ENODEV;
}

int __init omap_mux_init_signal(char *muxname, int val)
{
	struct omap_mux_entry *e;
	char *m0_name = NULL, *mode_name = NULL;
	int found = 0;

	mode_name = strchr(muxname, '.');
	if (mode_name) {
		*mode_name = '\0';
		mode_name++;
		m0_name = muxname;
	} 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;

		if (m0_name && strcmp(m0_name, m0_entry))
			continue;

		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	*/
1dbae815 TL	26	#include <linux/module.h>
1dbae815 TL	27	#include <linux/init.h>
fced80c7	28	#include <linux/io.h>
5a0e3ad6	29	#include <linux/slab.h>
1dbae815	30	#include <linux/spinlock.h>
15ac7afe	31	#include <linux/list.h>
4b715efc TL	32	#include <linux/ctype.h>
	33	#include <linux/debugfs.h>
	34	#include <linux/seq_file.h>
	35	#include <linux/uaccess.h>
1dbae815	36
fced80c7 RK	37	#include <asm/system.h>
fced80c7 RK	38
ce491cf8	39	#include <plat/control.h>
1dbae815	40
15ac7afe	41	#include "mux.h"
1dbae815	42
92c9f501 MR	43	#define OMAP_MUX_BASE_OFFSET 0x30 /* Offset from CTRL_BASE */
92c9f501 MR	44	#define OMAP_MUX_BASE_SZ 0x5ca
d5425be6	45	#define MUXABLE_GPIO_MODE3 BIT(0)
92c9f501	46
15ac7afe TL	47	struct omap_mux_entry {
	48	struct omap_mux mux;
	49	struct list_head node;
	50	};
	51
4b715efc	52	static unsigned long mux_phys;
92c9f501	53	static void __iomem *mux_base;
d5425be6	54	static u8 omap_mux_flags;
92c9f501	55
d4bb72e5	56	u16 omap_mux_read(u16 reg)
92c9f501 MR	57	{
	58	if (cpu_is_omap24xx())
	59	return __raw_readb(mux_base + reg);
	60	else
	61	return __raw_readw(mux_base + reg);
	62	}
	63
d4bb72e5	64	void omap_mux_write(u16 val, u16 reg)
92c9f501 MR	65	{
	66	if (cpu_is_omap24xx())
	67	__raw_writeb(val, mux_base + reg);
	68	else
	69	__raw_writew(val, mux_base + reg);
	70	}
7d7f665d	71
d4bb72e5 TL	72	void omap_mux_write_array(struct omap_board_mux *board_mux)
	73	{
	74	while (board_mux->reg_offset != OMAP_MUX_TERMINATOR) {
	75	omap_mux_write(board_mux->value, board_mux->reg_offset);
	76	board_mux++;
	77	}
	78	}
	79
15ac7afe TL	80	static LIST_HEAD(muxmodes);
	81	static DEFINE_MUTEX(muxmode_mutex);
	82
	83	#ifdef CONFIG_OMAP_MUX
	84
	85	static char *omap_mux_options;
	86
	87	int __init omap_mux_init_gpio(int gpio, int val)
	88	{
	89	struct omap_mux_entry *e;
	90	int found = 0;
	91
	92	if (!gpio)
	93	return -EINVAL;
	94
	95	list_for_each_entry(e, &muxmodes, node) {
	96	struct omap_mux *m = &e->mux;
	97	if (gpio == m->gpio) {
	98	u16 old_mode;
	99	u16 mux_mode;
	100
	101	old_mode = omap_mux_read(m->reg_offset);
	102	mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
d5425be6 TL	103	if (omap_mux_flags & MUXABLE_GPIO_MODE3)
	104	mux_mode \|= OMAP_MUX_MODE3;
	105	else
	106	mux_mode \|= OMAP_MUX_MODE4;
15ac7afe TL	107	printk(KERN_DEBUG "mux: Setting signal "
	108	"%s.gpio%i 0x%04x -> 0x%04x\n",
	109	m->muxnames[0], gpio, old_mode, mux_mode);
	110	omap_mux_write(mux_mode, m->reg_offset);
	111	found++;
	112	}
	113	}
	114
	115	if (found == 1)
	116	return 0;
	117
	118	if (found > 1) {
	119	printk(KERN_ERR "mux: Multiple gpio paths for gpio%i\n", gpio);
	120	return -EINVAL;
	121	}
	122
	123	printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
	124
	125	return -ENODEV;
	126	}
	127
	128	int __init omap_mux_init_signal(char *muxname, int val)
	129	{
	130	struct omap_mux_entry *e;
	131	char m0_name = NULL, mode_name = NULL;
	132	int found = 0;
	133
	134	mode_name = strchr(muxname, '.');
	135	if (mode_name) {
	136	*mode_name = '\0';
	137	mode_name++;
	138	m0_name = muxname;
	139	} else {
	140	mode_name = muxname;
	141	}
	142
	143	list_for_each_entry(e, &muxmodes, node) {
	144	struct omap_mux *m = &e->mux;
	145	char *m0_entry = m->muxnames[0];
	146	int i;
	147
	148	if (m0_name && strcmp(m0_name, m0_entry))
	149	continue;
	150
	151	for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
	152	char *mode_cur = m->muxnames[i];
	153
	154	if (!mode_cur)
	155	continue;
	156
	157	if (!strcmp(mode_name, mode_cur)) {
	158	u16 old_mode;
	159	u16 mux_mode;
	160
	161	old_mode = omap_mux_read(m->reg_offset);
	162	mux_mode = val \| i;
	163	printk(KERN_DEBUG "mux: Setting signal "
	164	"%s.%s 0x%04x -> 0x%04x\n",
	165	m0_entry, muxname, old_mode, mux_mode);
	166	omap_mux_write(mux_mode, m->reg_offset);
	167	found++;
	168	}
	169	}
	170	}
171
172	if (found == 1)
173	return 0;
174
175	if (found > 1) {
176	printk(KERN_ERR "mux: Multiple signal paths (%i) for %s\n",
177	found, muxname);
178	return -EINVAL;
179	}
180
181	printk(KERN_ERR "mux: Could not set signal %s\n", muxname);
182
183	return -ENODEV;
184	}
185
4b715efc TL	186	#ifdef CONFIG_DEBUG_FS
	187
	188	#define OMAP_MUX_MAX_NR_FLAGS 10
	189	#define OMAP_MUX_TEST_FLAG(val, mask) \
	190	if (((val) & (mask)) == (mask)) { \
	191	i++; \
	192	flags[i] = #mask; \
	193	}
	194
	195	/* REVISIT: Add checking for non-optimal mux settings */
	196	static inline void omap_mux_decode(struct seq_file *s, u16 val)
	197	{
	198	char *flags[OMAP_MUX_MAX_NR_FLAGS];
78737ae1	199	char mode[sizeof("OMAP_MUX_MODE") + 1];
4b715efc TL	200	int i = -1;
	201
	202	sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7);
	203	i++;
	204	flags[i] = mode;
	205
	206	OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE);
	207	if (val & OMAP_OFF_EN) {
	208	if (!(val & OMAP_OFFOUT_EN)) {
	209	if (!(val & OMAP_OFF_PULL_UP)) {
	210	OMAP_MUX_TEST_FLAG(val,
	211	OMAP_PIN_OFF_INPUT_PULLDOWN);
	212	} else {
	213	OMAP_MUX_TEST_FLAG(val,
	214	OMAP_PIN_OFF_INPUT_PULLUP);
	215	}
	216	} else {
	217	if (!(val & OMAP_OFFOUT_VAL)) {
	218	OMAP_MUX_TEST_FLAG(val,
	219	OMAP_PIN_OFF_OUTPUT_LOW);
	220	} else {
	221	OMAP_MUX_TEST_FLAG(val,
	222	OMAP_PIN_OFF_OUTPUT_HIGH);
	223	}
	224	}
	225	}
	226
	227	if (val & OMAP_INPUT_EN) {
	228	if (val & OMAP_PULL_ENA) {
	229	if (!(val & OMAP_PULL_UP)) {
	230	OMAP_MUX_TEST_FLAG(val,
	231	OMAP_PIN_INPUT_PULLDOWN);
	232	} else {
	233	OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP);
	234	}
	235	} else {
	236	OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT);
	237	}
	238	} else {
	239	i++;
	240	flags[i] = "OMAP_PIN_OUTPUT";
	241	}
	242
	243	do {
	244	seq_printf(s, "%s", flags[i]);
	245	if (i > 0)
	246	seq_printf(s, " \| ");
	247	} while (i-- > 0);
	248	}
	249
	250	#define OMAP_MUX_DEFNAME_LEN 16
	251
	252	static int omap_mux_dbg_board_show(struct seq_file s, void unused)
	253	{
	254	struct omap_mux_entry *e;
	255
	256	list_for_each_entry(e, &muxmodes, node) {
	257	struct omap_mux *m = &e->mux;
	258	char m0_def[OMAP_MUX_DEFNAME_LEN];
	259	char *m0_name = m->muxnames[0];
	260	u16 val;
	261	int i, mode;
	262
	263	if (!m0_name)
264	continue;
265
78737ae1	266	/* REVISIT: Needs to be updated if mode0 names get longer */
4b715efc TL	267	for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) {
	268	if (m0_name[i] == '\0') {
	269	m0_def[i] = m0_name[i];
	270	break;
	271	}
	272	m0_def[i] = toupper(m0_name[i]);
	273	}
	274	val = omap_mux_read(m->reg_offset);
	275	mode = val & OMAP_MUX_MODE7;
	276
	277	seq_printf(s, "OMAP%i_MUX(%s, ",
	278	cpu_is_omap34xx() ? 3 : 0, m0_def);
	279	omap_mux_decode(s, val);
	280	seq_printf(s, "),\n");
	281	}
	282
	283	return 0;
	284	}
	285
	286	static int omap_mux_dbg_board_open(struct inode inode, struct file file)
	287	{
	288	return single_open(file, omap_mux_dbg_board_show, &inode->i_private);
	289	}
	290
	291	static const struct file_operations omap_mux_dbg_board_fops = {
	292	.open = omap_mux_dbg_board_open,
	293	.read = seq_read,
	294	.llseek = seq_lseek,
	295	.release = single_release,
	296	};
	297
	298	static int omap_mux_dbg_signal_show(struct seq_file s, void unused)
	299	{
	300	struct omap_mux *m = s->private;
	301	const char *none = "NA";
	302	u16 val;
	303	int mode;
	304
	305	val = omap_mux_read(m->reg_offset);
	306	mode = val & OMAP_MUX_MODE7;
	307
	308	seq_printf(s, "name: %s.%s (0x%08lx/0x%03x = 0x%04x), b %s, t %s\n",
	309	m->muxnames[0], m->muxnames[mode],
	310	mux_phys + m->reg_offset, m->reg_offset, val,
	311	m->balls[0] ? m->balls[0] : none,
	312	m->balls[1] ? m->balls[1] : none);
	313	seq_printf(s, "mode: ");
	314	omap_mux_decode(s, val);
	315	seq_printf(s, "\n");
	316	seq_printf(s, "signals: %s \| %s \| %s \| %s \| %s \| %s \| %s \| %s\n",
	317	m->muxnames[0] ? m->muxnames[0] : none,
	318	m->muxnames[1] ? m->muxnames[1] : none,
	319	m->muxnames[2] ? m->muxnames[2] : none,
	320	m->muxnames[3] ? m->muxnames[3] : none,
	321	m->muxnames[4] ? m->muxnames[4] : none,
	322	m->muxnames[5] ? m->muxnames[5] : none,
	323	m->muxnames[6] ? m->muxnames[6] : none,
	324	m->muxnames[7] ? m->muxnames[7] : none);
	325
	326	return 0;
	327	}
	328
	329	#define OMAP_MUX_MAX_ARG_CHAR 7
	330
331	static ssize_t omap_mux_dbg_signal_write(struct file *file,
332	const char __user *user_buf,
333	size_t count, loff_t *ppos)
334	{
335	char buf[OMAP_MUX_MAX_ARG_CHAR];
336	struct seq_file *seqf;
337	struct omap_mux *m;
338	unsigned long val;
339	int buf_size, ret;
340
341	if (count > OMAP_MUX_MAX_ARG_CHAR)
342	return -EINVAL;
343
344	memset(buf, 0, sizeof(buf));
345	buf_size = min(count, sizeof(buf) - 1);
346
347	if (copy_from_user(buf, user_buf, buf_size))
348	return -EFAULT;
349
350	ret = strict_strtoul(buf, 0x10, &val);
351	if (ret < 0)
352	return ret;
353
354	if (val > 0xffff)
355	return -EINVAL;
356
357	seqf = file->private_data;
358	m = seqf->private;
359
360	omap_mux_write((u16)val, m->reg_offset);
361	*ppos += count;
362
363	return count;
364	}
365
366	static int omap_mux_dbg_signal_open(struct inode inode, struct file file)
367	{
368	return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
369	}
370
371	static const struct file_operations omap_mux_dbg_signal_fops = {
372	.open = omap_mux_dbg_signal_open,
373	.read = seq_read,
374	.write = omap_mux_dbg_signal_write,
375	.llseek = seq_lseek,
376	.release = single_release,
377	};
378
379	static struct dentry *mux_dbg_dir;
380
381	static void __init omap_mux_dbg_init(void)
382	{
383	struct omap_mux_entry *e;
384
385	mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
386	if (!mux_dbg_dir)
387	return;
388
389	(void)debugfs_create_file("board", S_IRUGO, mux_dbg_dir,
390	NULL, &omap_mux_dbg_board_fops);
391
392	list_for_each_entry(e, &muxmodes, node) {
393	struct omap_mux *m = &e->mux;
394
395	(void)debugfs_create_file(m->muxnames[0], S_IWUGO, mux_dbg_dir,
396	m, &omap_mux_dbg_signal_fops);
397	}
398	}
399
400	#else
401	static inline void omap_mux_dbg_init(void)
402	{
403	}
404	#endif /* CONFIG_DEBUG_FS */
405
15ac7afe TL	406	static void __init omap_mux_free_names(struct omap_mux *m)
	407	{
	408	int i;
	409
	410	for (i = 0; i < OMAP_MUX_NR_MODES; i++)
	411	kfree(m->muxnames[i]);
	412
	413	#ifdef CONFIG_DEBUG_FS
	414	for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
	415	kfree(m->balls[i]);
	416	#endif
	417
	418	}
	419
	420	/* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
	421	static int __init omap_mux_late_init(void)
	422	{
	423	struct omap_mux_entry e, tmp;
	424
	425	list_for_each_entry_safe(e, tmp, &muxmodes, node) {
	426	struct omap_mux *m = &e->mux;
	427	u16 mode = omap_mux_read(m->reg_offset);
	428
	429	if (OMAP_MODE_GPIO(mode))
	430	continue;
	431
	432	#ifndef CONFIG_DEBUG_FS
	433	mutex_lock(&muxmode_mutex);
	434	list_del(&e->node);
	435	mutex_unlock(&muxmode_mutex);
	436	omap_mux_free_names(m);
	437	kfree(m);
1dbae815	438	#endif
15ac7afe TL	439
	440	}
	441
4b715efc TL	442	omap_mux_dbg_init();
4b715efc TL	443
15ac7afe TL	444	return 0;
	445	}
	446	late_initcall(omap_mux_late_init);
	447
	448	static void __init omap_mux_package_fixup(struct omap_mux *p,
	449	struct omap_mux *superset)
	450	{
	451	while (p->reg_offset != OMAP_MUX_TERMINATOR) {
	452	struct omap_mux *s = superset;
	453	int found = 0;
	454
	455	while (s->reg_offset != OMAP_MUX_TERMINATOR) {
	456	if (s->reg_offset == p->reg_offset) {
	457	s = p;
	458	found++;
	459	break;
	460	}
	461	s++;
	462	}
	463	if (!found)
	464	printk(KERN_ERR "mux: Unknown entry offset 0x%x\n",
	465	p->reg_offset);
	466	p++;
	467	}
	468	}
	469
	470	#ifdef CONFIG_DEBUG_FS
	471
	472	static void __init omap_mux_package_init_balls(struct omap_ball *b,
	473	struct omap_mux *superset)
	474	{
	475	while (b->reg_offset != OMAP_MUX_TERMINATOR) {
	476	struct omap_mux *s = superset;
	477	int found = 0;
	478
	479	while (s->reg_offset != OMAP_MUX_TERMINATOR) {
	480	if (s->reg_offset == b->reg_offset) {
	481	s->balls[0] = b->balls[0];
	482	s->balls[1] = b->balls[1];
	483	found++;
	484	break;
	485	}
	486	s++;
	487	}
	488	if (!found)
	489	printk(KERN_ERR "mux: Unknown ball offset 0x%x\n",
	490	b->reg_offset);
	491	b++;
	492	}
	493	}
	494
	495	#else /* CONFIG_DEBUG_FS */
	496
	497	static inline void omap_mux_package_init_balls(struct omap_ball *b,
	498	struct omap_mux *superset)
	499	{
	500	}
	501
	502	#endif /* CONFIG_DEBUG_FS */
	503
	504	static int __init omap_mux_setup(char *options)
	505	{
	506	if (!options)
	507	return 0;
508
509	omap_mux_options = options;
510
511	return 1;
512	}
513	__setup("omap_mux=", omap_mux_setup);
514
515	/*
516	* Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
517	* cmdline options only override the bootloader values.
518	* During development, please enable CONFIG_DEBUG_FS, and use the
519	* signal specific entries under debugfs.
520	*/
521	static void __init omap_mux_set_cmdline_signals(void)
522	{
523	char options, next_opt, *token;
524
525	if (!omap_mux_options)
526	return;
527
528	options = kmalloc(strlen(omap_mux_options) + 1, GFP_KERNEL);
529	if (!options)
530	return;
531
532	strcpy(options, omap_mux_options);
533	next_opt = options;
534
535	while ((token = strsep(&next_opt, ",")) != NULL) {
536	char keyval, name;
537	unsigned long val;
538
539	keyval = token;
540	name = strsep(&keyval, "=");
541	if (name) {
542	int res;
543
544	res = strict_strtoul(keyval, 0x10, &val);
545	if (res < 0)
546	continue;
547
548	omap_mux_init_signal(name, (u16)val);
549	}
550	}
551
552	kfree(options);
553	}
554
15ac7afe TL	555	static int __init omap_mux_copy_names(struct omap_mux *src,
	556	struct omap_mux *dst)
	557	{
	558	int i;
	559
	560	for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
	561	if (src->muxnames[i]) {
	562	dst->muxnames[i] =
	563	kmalloc(strlen(src->muxnames[i]) + 1,
	564	GFP_KERNEL);
	565	if (!dst->muxnames[i])
	566	goto free;
	567	strcpy(dst->muxnames[i], src->muxnames[i]);
	568	}
	569	}
	570
	571	#ifdef CONFIG_DEBUG_FS
	572	for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
	573	if (src->balls[i]) {
	574	dst->balls[i] =
	575	kmalloc(strlen(src->balls[i]) + 1,
	576	GFP_KERNEL);
	577	if (!dst->balls[i])
	578	goto free;
	579	strcpy(dst->balls[i], src->balls[i]);
	580	}
	581	}
	582	#endif
	583
	584	return 0;
	585
	586	free:
	587	omap_mux_free_names(dst);
	588	return -ENOMEM;
	589
	590	}
	591
	592	#endif /* CONFIG_OMAP_MUX */
	593
	594	static u16 omap_mux_get_by_gpio(int gpio)
	595	{
	596	struct omap_mux_entry *e;
	597	u16 offset = OMAP_MUX_TERMINATOR;
	598
	599	list_for_each_entry(e, &muxmodes, node) {
	600	struct omap_mux *m = &e->mux;
	601	if (m->gpio == gpio) {
	602	offset = m->reg_offset;
	603	break;
	604	}
	605	}
	606
	607	return offset;
	608	}
	609
	610	/* Needed for dynamic muxing of GPIO pins for off-idle */
	611	u16 omap_mux_get_gpio(int gpio)
	612	{
	613	u16 offset;
	614
	615	offset = omap_mux_get_by_gpio(gpio);
	616	if (offset == OMAP_MUX_TERMINATOR) {
	617	printk(KERN_ERR "mux: Could not get gpio%i\n", gpio);
	618	return offset;
619	}
620
621	return omap_mux_read(offset);
622	}
623
624	/* Needed for dynamic muxing of GPIO pins for off-idle */
625	void omap_mux_set_gpio(u16 val, int gpio)
626	{
627	u16 offset;
628
629	offset = omap_mux_get_by_gpio(gpio);
630	if (offset == OMAP_MUX_TERMINATOR) {
631	printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
632	return;
633	}
634
635	omap_mux_write(val, offset);
636	}
637
638	static struct omap_mux * __init omap_mux_list_add(struct omap_mux *src)
639	{
640	struct omap_mux_entry *entry;
641	struct omap_mux *m;
642
643	entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
644	if (!entry)
645	return NULL;
646
647	m = &entry->mux;
648	memcpy(m, src, sizeof(struct omap_mux_entry));
649
650	#ifdef CONFIG_OMAP_MUX
651	if (omap_mux_copy_names(src, m)) {
652	kfree(entry);
653	return NULL;
654	}
655	#endif
656
657	mutex_lock(&muxmode_mutex);
658	list_add_tail(&entry->node, &muxmodes);
659	mutex_unlock(&muxmode_mutex);
660
661	return m;
662	}
663
664	/*
665	* Note if CONFIG_OMAP_MUX is not selected, we will only initialize
666	* the GPIO to mux offset mapping that is needed for dynamic muxing
667	* of GPIO pins for off-idle.
668	*/
669	static void __init omap_mux_init_list(struct omap_mux *superset)
670	{
671	while (superset->reg_offset != OMAP_MUX_TERMINATOR) {
672	struct omap_mux *entry;
673
b72c7d54 RL	674	#ifdef CONFIG_OMAP_MUX
b72c7d54 RL	675	if (!superset->muxnames \|\| !superset->muxnames[0]) {
15ac7afe TL	676	superset++;
	677	continue;
	678	}
b72c7d54 RL	679	#else
	680	/* Skip pins that are not muxed as GPIO by bootloader */
	681	if (!OMAP_MODE_GPIO(omap_mux_read(superset->reg_offset))) {
9ecef433 TL	682	superset++;
	683	continue;
	684	}
	685	#endif
	686
15ac7afe TL	687	entry = omap_mux_list_add(superset);
	688	if (!entry) {
	689	printk(KERN_ERR "mux: Could not add entry\n");
	690	return;
	691	}
	692	superset++;
	693	}
	694	}
	695
321cfc85 TL	696	#ifdef CONFIG_OMAP_MUX
	697
	698	static void omap_mux_init_package(struct omap_mux *superset,
	699	struct omap_mux *package_subset,
	700	struct omap_ball *package_balls)
	701	{
	702	if (package_subset)
	703	omap_mux_package_fixup(package_subset, superset);
	704	if (package_balls)
	705	omap_mux_package_init_balls(package_balls, superset);
	706	}
	707
	708	static void omap_mux_init_signals(struct omap_board_mux *board_mux)
	709	{
	710	omap_mux_set_cmdline_signals();
	711	omap_mux_write_array(board_mux);
	712	}
	713
	714	#else
	715
	716	static void omap_mux_init_package(struct omap_mux *superset,
	717	struct omap_mux *package_subset,
	718	struct omap_ball *package_balls)
	719	{
	720	}
	721
	722	static void omap_mux_init_signals(struct omap_board_mux *board_mux)
	723	{
	724	}
	725
	726	#endif
	727
15ac7afe TL	728	int __init omap_mux_init(u32 mux_pbase, u32 mux_size,
	729	struct omap_mux *superset,
	730	struct omap_mux *package_subset,
	731	struct omap_board_mux *board_mux,
	732	struct omap_ball *package_balls)
	733	{
	734	if (mux_base)
	735	return -EBUSY;
	736
4b715efc	737	mux_phys = mux_pbase;
15ac7afe TL	738	mux_base = ioremap(mux_pbase, mux_size);
	739	if (!mux_base) {
	740	printk(KERN_ERR "mux: Could not ioremap\n");
	741	return -ENODEV;
	742	}
	743
d5425be6 TL	744	if (cpu_is_omap24xx())
	745	omap_mux_flags = MUXABLE_GPIO_MODE3;
	746
321cfc85	747	omap_mux_init_package(superset, package_subset, package_balls);
15ac7afe	748	omap_mux_init_list(superset);
321cfc85	749	omap_mux_init_signals(board_mux);
2cb0c54f	750
15ac7afe TL	751	return 0;
	752	}
	753