[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/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;
	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(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;
ca828760	90	struct omap_mux *gpio_mux = NULL;
8a6f7e14 GI	91	u16 old_mode;
8a6f7e14 GI	92	u16 mux_mode;
15ac7afe TL	93	int found = 0;
	94
	95	if (!gpio)
	96	return -EINVAL;
	97
	98	list_for_each_entry(e, &muxmodes, node) {
	99	struct omap_mux *m = &e->mux;
	100	if (gpio == m->gpio) {
8a6f7e14	101	gpio_mux = m;
15ac7afe TL	102	found++;
	103	}
	104	}
	105
8a6f7e14 GI	106	if (found == 0) {
	107	printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
	108	return -ENODEV;
	109	}
15ac7afe TL	110
15ac7afe TL	111	if (found > 1) {
8a6f7e14 GI	112	printk(KERN_INFO "mux: Multiple gpio paths (%d) for gpio%i\n",
8a6f7e14 GI	113	found, gpio);
15ac7afe TL	114	return -EINVAL;
	115	}
	116
8a6f7e14 GI	117	old_mode = omap_mux_read(gpio_mux->reg_offset);
	118	mux_mode = val & ~(OMAP_MUX_NR_MODES - 1);
	119	if (omap_mux_flags & MUXABLE_GPIO_MODE3)
	120	mux_mode \|= OMAP_MUX_MODE3;
	121	else
	122	mux_mode \|= OMAP_MUX_MODE4;
	123	printk(KERN_DEBUG "mux: Setting signal %s.gpio%i 0x%04x -> 0x%04x\n",
	124	gpio_mux->muxnames[0], gpio, old_mode, mux_mode);
	125	omap_mux_write(mux_mode, gpio_mux->reg_offset);
15ac7afe	126
8a6f7e14	127	return 0;
15ac7afe TL	128	}
	129
	130	int __init omap_mux_init_signal(char *muxname, int val)
	131	{
	132	struct omap_mux_entry *e;
	133	char m0_name = NULL, mode_name = NULL;
	134	int found = 0;
	135
	136	mode_name = strchr(muxname, '.');
	137	if (mode_name) {
	138	*mode_name = '\0';
	139	mode_name++;
	140	m0_name = muxname;
	141	} else {
	142	mode_name = muxname;
	143	}
	144
	145	list_for_each_entry(e, &muxmodes, node) {
	146	struct omap_mux *m = &e->mux;
	147	char *m0_entry = m->muxnames[0];
	148	int i;
	149
	150	if (m0_name && strcmp(m0_name, m0_entry))
	151	continue;
	152
	153	for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
	154	char *mode_cur = m->muxnames[i];
	155
	156	if (!mode_cur)
	157	continue;
	158
	159	if (!strcmp(mode_name, mode_cur)) {
	160	u16 old_mode;
	161	u16 mux_mode;
	162
	163	old_mode = omap_mux_read(m->reg_offset);
	164	mux_mode = val \| i;
	165	printk(KERN_DEBUG "mux: Setting signal "
	166	"%s.%s 0x%04x -> 0x%04x\n",
	167	m0_entry, muxname, old_mode, mux_mode);
	168	omap_mux_write(mux_mode, m->reg_offset);
	169	found++;
	170	}
	171	}
	172	}
	173
	174	if (found == 1)
	175	return 0;
	176
	177	if (found > 1) {
	178	printk(KERN_ERR "mux: Multiple signal paths (%i) for %s\n",
	179	found, muxname);
	180	return -EINVAL;
	181	}
	182
	183	printk(KERN_ERR "mux: Could not set signal %s\n", muxname);
	184
	185	return -ENODEV;
	186	}
	187
4b715efc TL	188	#ifdef CONFIG_DEBUG_FS
	189
	190	#define OMAP_MUX_MAX_NR_FLAGS 10
	191	#define OMAP_MUX_TEST_FLAG(val, mask) \
	192	if (((val) & (mask)) == (mask)) { \
	193	i++; \
	194	flags[i] = #mask; \
	195	}
	196
	197	/* REVISIT: Add checking for non-optimal mux settings */
	198	static inline void omap_mux_decode(struct seq_file *s, u16 val)
	199	{
	200	char *flags[OMAP_MUX_MAX_NR_FLAGS];
78737ae1	201	char mode[sizeof("OMAP_MUX_MODE") + 1];
4b715efc TL	202	int i = -1;
	203
	204	sprintf(mode, "OMAP_MUX_MODE%d", val & 0x7);
	205	i++;
	206	flags[i] = mode;
	207
	208	OMAP_MUX_TEST_FLAG(val, OMAP_PIN_OFF_WAKEUPENABLE);
	209	if (val & OMAP_OFF_EN) {
	210	if (!(val & OMAP_OFFOUT_EN)) {
	211	if (!(val & OMAP_OFF_PULL_UP)) {
	212	OMAP_MUX_TEST_FLAG(val,
	213	OMAP_PIN_OFF_INPUT_PULLDOWN);
	214	} else {
	215	OMAP_MUX_TEST_FLAG(val,
	216	OMAP_PIN_OFF_INPUT_PULLUP);
	217	}
	218	} else {
	219	if (!(val & OMAP_OFFOUT_VAL)) {
	220	OMAP_MUX_TEST_FLAG(val,
	221	OMAP_PIN_OFF_OUTPUT_LOW);
	222	} else {
	223	OMAP_MUX_TEST_FLAG(val,
	224	OMAP_PIN_OFF_OUTPUT_HIGH);
	225	}
	226	}
	227	}
	228
	229	if (val & OMAP_INPUT_EN) {
	230	if (val & OMAP_PULL_ENA) {
	231	if (!(val & OMAP_PULL_UP)) {
	232	OMAP_MUX_TEST_FLAG(val,
	233	OMAP_PIN_INPUT_PULLDOWN);
	234	} else {
	235	OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT_PULLUP);
	236	}
	237	} else {
	238	OMAP_MUX_TEST_FLAG(val, OMAP_PIN_INPUT);
	239	}
	240	} else {
	241	i++;
	242	flags[i] = "OMAP_PIN_OUTPUT";
	243	}
	244
	245	do {
	246	seq_printf(s, "%s", flags[i]);
	247	if (i > 0)
	248	seq_printf(s, " \| ");
	249	} while (i-- > 0);
	250	}
	251
	252	#define OMAP_MUX_DEFNAME_LEN 16
	253
	254	static int omap_mux_dbg_board_show(struct seq_file s, void unused)
	255	{
	256	struct omap_mux_entry *e;
	257
	258	list_for_each_entry(e, &muxmodes, node) {
	259	struct omap_mux *m = &e->mux;
	260	char m0_def[OMAP_MUX_DEFNAME_LEN];
	261	char *m0_name = m->muxnames[0];
	262	u16 val;
	263	int i, mode;
	264
	265	if (!m0_name)
266	continue;
267
78737ae1	268	/* REVISIT: Needs to be updated if mode0 names get longer */
4b715efc TL	269	for (i = 0; i < OMAP_MUX_DEFNAME_LEN; i++) {
	270	if (m0_name[i] == '\0') {
	271	m0_def[i] = m0_name[i];
	272	break;
	273	}
	274	m0_def[i] = toupper(m0_name[i]);
	275	}
	276	val = omap_mux_read(m->reg_offset);
	277	mode = val & OMAP_MUX_MODE7;
	278
	279	seq_printf(s, "OMAP%i_MUX(%s, ",
	280	cpu_is_omap34xx() ? 3 : 0, m0_def);
	281	omap_mux_decode(s, val);
	282	seq_printf(s, "),\n");
	283	}
	284
	285	return 0;
	286	}
	287
	288	static int omap_mux_dbg_board_open(struct inode inode, struct file file)
	289	{
	290	return single_open(file, omap_mux_dbg_board_show, &inode->i_private);
	291	}
	292
	293	static const struct file_operations omap_mux_dbg_board_fops = {
	294	.open = omap_mux_dbg_board_open,
	295	.read = seq_read,
	296	.llseek = seq_lseek,
	297	.release = single_release,
	298	};
	299
	300	static int omap_mux_dbg_signal_show(struct seq_file s, void unused)
	301	{
	302	struct omap_mux *m = s->private;
	303	const char *none = "NA";
	304	u16 val;
	305	int mode;
	306
	307	val = omap_mux_read(m->reg_offset);
	308	mode = val & OMAP_MUX_MODE7;
	309
	310	seq_printf(s, "name: %s.%s (0x%08lx/0x%03x = 0x%04x), b %s, t %s\n",
	311	m->muxnames[0], m->muxnames[mode],
	312	mux_phys + m->reg_offset, m->reg_offset, val,
	313	m->balls[0] ? m->balls[0] : none,
	314	m->balls[1] ? m->balls[1] : none);
	315	seq_printf(s, "mode: ");
	316	omap_mux_decode(s, val);
	317	seq_printf(s, "\n");
	318	seq_printf(s, "signals: %s \| %s \| %s \| %s \| %s \| %s \| %s \| %s\n",
	319	m->muxnames[0] ? m->muxnames[0] : none,
	320	m->muxnames[1] ? m->muxnames[1] : none,
	321	m->muxnames[2] ? m->muxnames[2] : none,
	322	m->muxnames[3] ? m->muxnames[3] : none,
	323	m->muxnames[4] ? m->muxnames[4] : none,
	324	m->muxnames[5] ? m->muxnames[5] : none,
	325	m->muxnames[6] ? m->muxnames[6] : none,
	326	m->muxnames[7] ? m->muxnames[7] : none);
	327
	328	return 0;
	329	}
	330
	331	#define OMAP_MUX_MAX_ARG_CHAR 7
	332
333	static ssize_t omap_mux_dbg_signal_write(struct file *file,
334	const char __user *user_buf,
335	size_t count, loff_t *ppos)
336	{
337	char buf[OMAP_MUX_MAX_ARG_CHAR];
338	struct seq_file *seqf;
339	struct omap_mux *m;
340	unsigned long val;
341	int buf_size, ret;
342
343	if (count > OMAP_MUX_MAX_ARG_CHAR)
344	return -EINVAL;
345
346	memset(buf, 0, sizeof(buf));
347	buf_size = min(count, sizeof(buf) - 1);
348
349	if (copy_from_user(buf, user_buf, buf_size))
350	return -EFAULT;
351
352	ret = strict_strtoul(buf, 0x10, &val);
353	if (ret < 0)
354	return ret;
355
356	if (val > 0xffff)
357	return -EINVAL;
358
359	seqf = file->private_data;
360	m = seqf->private;
361
362	omap_mux_write((u16)val, m->reg_offset);
363	*ppos += count;
364
365	return count;
366	}
367
368	static int omap_mux_dbg_signal_open(struct inode inode, struct file file)
369	{
370	return single_open(file, omap_mux_dbg_signal_show, inode->i_private);
371	}
372
373	static const struct file_operations omap_mux_dbg_signal_fops = {
374	.open = omap_mux_dbg_signal_open,
375	.read = seq_read,
376	.write = omap_mux_dbg_signal_write,
377	.llseek = seq_lseek,
378	.release = single_release,
379	};
380
381	static struct dentry *mux_dbg_dir;
382
383	static void __init omap_mux_dbg_init(void)
384	{
385	struct omap_mux_entry *e;
386
387	mux_dbg_dir = debugfs_create_dir("omap_mux", NULL);
388	if (!mux_dbg_dir)
389	return;
390
391	(void)debugfs_create_file("board", S_IRUGO, mux_dbg_dir,
392	NULL, &omap_mux_dbg_board_fops);
393
394	list_for_each_entry(e, &muxmodes, node) {
395	struct omap_mux *m = &e->mux;
396
397	(void)debugfs_create_file(m->muxnames[0], S_IWUGO, mux_dbg_dir,
398	m, &omap_mux_dbg_signal_fops);
399	}
400	}
401
402	#else
403	static inline void omap_mux_dbg_init(void)
404	{
405	}
406	#endif /* CONFIG_DEBUG_FS */
407
15ac7afe TL	408	static void __init omap_mux_free_names(struct omap_mux *m)
	409	{
	410	int i;
	411
	412	for (i = 0; i < OMAP_MUX_NR_MODES; i++)
	413	kfree(m->muxnames[i]);
	414
	415	#ifdef CONFIG_DEBUG_FS
	416	for (i = 0; i < OMAP_MUX_NR_SIDES; i++)
	417	kfree(m->balls[i]);
	418	#endif
	419
	420	}
	421
	422	/* Free all data except for GPIO pins unless CONFIG_DEBUG_FS is set */
	423	static int __init omap_mux_late_init(void)
	424	{
	425	struct omap_mux_entry e, tmp;
	426
	427	list_for_each_entry_safe(e, tmp, &muxmodes, node) {
	428	struct omap_mux *m = &e->mux;
	429	u16 mode = omap_mux_read(m->reg_offset);
	430
	431	if (OMAP_MODE_GPIO(mode))
	432	continue;
	433
	434	#ifndef CONFIG_DEBUG_FS
	435	mutex_lock(&muxmode_mutex);
	436	list_del(&e->node);
	437	mutex_unlock(&muxmode_mutex);
	438	omap_mux_free_names(m);
	439	kfree(m);
1dbae815	440	#endif
15ac7afe TL	441
	442	}
	443
4b715efc TL	444	omap_mux_dbg_init();
4b715efc TL	445
15ac7afe TL	446	return 0;
	447	}
	448	late_initcall(omap_mux_late_init);
	449
	450	static void __init omap_mux_package_fixup(struct omap_mux *p,
	451	struct omap_mux *superset)
	452	{
	453	while (p->reg_offset != OMAP_MUX_TERMINATOR) {
	454	struct omap_mux *s = superset;
	455	int found = 0;
	456
	457	while (s->reg_offset != OMAP_MUX_TERMINATOR) {
	458	if (s->reg_offset == p->reg_offset) {
	459	s = p;
	460	found++;
	461	break;
	462	}
	463	s++;
	464	}
	465	if (!found)
	466	printk(KERN_ERR "mux: Unknown entry offset 0x%x\n",
	467	p->reg_offset);
	468	p++;
	469	}
	470	}
	471
	472	#ifdef CONFIG_DEBUG_FS
	473
	474	static void __init omap_mux_package_init_balls(struct omap_ball *b,
	475	struct omap_mux *superset)
	476	{
	477	while (b->reg_offset != OMAP_MUX_TERMINATOR) {
	478	struct omap_mux *s = superset;
	479	int found = 0;
	480
	481	while (s->reg_offset != OMAP_MUX_TERMINATOR) {
	482	if (s->reg_offset == b->reg_offset) {
	483	s->balls[0] = b->balls[0];
	484	s->balls[1] = b->balls[1];
	485	found++;
	486	break;
	487	}
	488	s++;
	489	}
	490	if (!found)
	491	printk(KERN_ERR "mux: Unknown ball offset 0x%x\n",
	492	b->reg_offset);
	493	b++;
	494	}
	495	}
	496
	497	#else /* CONFIG_DEBUG_FS */
	498
	499	static inline void omap_mux_package_init_balls(struct omap_ball *b,
	500	struct omap_mux *superset)
	501	{
	502	}
	503
	504	#endif /* CONFIG_DEBUG_FS */
	505
	506	static int __init omap_mux_setup(char *options)
	507	{
	508	if (!options)
	509	return 0;
510
511	omap_mux_options = options;
512
513	return 1;
514	}
515	__setup("omap_mux=", omap_mux_setup);
516
517	/*
518	* Note that the omap_mux=some.signal1=0x1234,some.signal2=0x1234
519	* cmdline options only override the bootloader values.
520	* During development, please enable CONFIG_DEBUG_FS, and use the
521	* signal specific entries under debugfs.
522	*/
523	static void __init omap_mux_set_cmdline_signals(void)
524	{
525	char options, next_opt, *token;
526
527	if (!omap_mux_options)
528	return;
529
530	options = kmalloc(strlen(omap_mux_options) + 1, GFP_KERNEL);
531	if (!options)
532	return;
533
534	strcpy(options, omap_mux_options);
535	next_opt = options;
536
537	while ((token = strsep(&next_opt, ",")) != NULL) {
538	char keyval, name;
539	unsigned long val;
540
541	keyval = token;
542	name = strsep(&keyval, "=");
543	if (name) {
544	int res;
545
546	res = strict_strtoul(keyval, 0x10, &val);
547	if (res < 0)
548	continue;
549
550	omap_mux_init_signal(name, (u16)val);
551	}
552	}
553
554	kfree(options);
555	}
556
15ac7afe TL	557	static int __init omap_mux_copy_names(struct omap_mux *src,
	558	struct omap_mux *dst)
	559	{
	560	int i;
	561
	562	for (i = 0; i < OMAP_MUX_NR_MODES; i++) {
	563	if (src->muxnames[i]) {
	564	dst->muxnames[i] =
	565	kmalloc(strlen(src->muxnames[i]) + 1,
	566	GFP_KERNEL);
	567	if (!dst->muxnames[i])
	568	goto free;
	569	strcpy(dst->muxnames[i], src->muxnames[i]);
	570	}
	571	}
	572
	573	#ifdef CONFIG_DEBUG_FS
	574	for (i = 0; i < OMAP_MUX_NR_SIDES; i++) {
	575	if (src->balls[i]) {
	576	dst->balls[i] =
	577	kmalloc(strlen(src->balls[i]) + 1,
	578	GFP_KERNEL);
	579	if (!dst->balls[i])
	580	goto free;
	581	strcpy(dst->balls[i], src->balls[i]);
	582	}
	583	}
	584	#endif
	585
	586	return 0;
	587
	588	free:
	589	omap_mux_free_names(dst);
	590	return -ENOMEM;
	591
	592	}
	593
	594	#endif /* CONFIG_OMAP_MUX */
	595
	596	static u16 omap_mux_get_by_gpio(int gpio)
	597	{
	598	struct omap_mux_entry *e;
	599	u16 offset = OMAP_MUX_TERMINATOR;
	600
	601	list_for_each_entry(e, &muxmodes, node) {
	602	struct omap_mux *m = &e->mux;
	603	if (m->gpio == gpio) {
	604	offset = m->reg_offset;
	605	break;
	606	}
	607	}
	608
	609	return offset;
	610	}
	611
	612	/* Needed for dynamic muxing of GPIO pins for off-idle */
	613	u16 omap_mux_get_gpio(int gpio)
	614	{
	615	u16 offset;
	616
	617	offset = omap_mux_get_by_gpio(gpio);
	618	if (offset == OMAP_MUX_TERMINATOR) {
	619	printk(KERN_ERR "mux: Could not get gpio%i\n", gpio);
	620	return offset;
621	}
622
623	return omap_mux_read(offset);
624	}
625
626	/* Needed for dynamic muxing of GPIO pins for off-idle */
627	void omap_mux_set_gpio(u16 val, int gpio)
628	{
629	u16 offset;
630
631	offset = omap_mux_get_by_gpio(gpio);
632	if (offset == OMAP_MUX_TERMINATOR) {
633	printk(KERN_ERR "mux: Could not set gpio%i\n", gpio);
634	return;
635	}
636
637	omap_mux_write(val, offset);
638	}
639
640	static struct omap_mux * __init omap_mux_list_add(struct omap_mux *src)
641	{
642	struct omap_mux_entry *entry;
643	struct omap_mux *m;
644
645	entry = kzalloc(sizeof(struct omap_mux_entry), GFP_KERNEL);
646	if (!entry)
647	return NULL;
648
649	m = &entry->mux;
650	memcpy(m, src, sizeof(struct omap_mux_entry));
651
652	#ifdef CONFIG_OMAP_MUX
653	if (omap_mux_copy_names(src, m)) {
654	kfree(entry);
655	return NULL;
656	}
657	#endif
658
659	mutex_lock(&muxmode_mutex);
660	list_add_tail(&entry->node, &muxmodes);
661	mutex_unlock(&muxmode_mutex);
662
663	return m;
664	}
665
666	/*
667	* Note if CONFIG_OMAP_MUX is not selected, we will only initialize
668	* the GPIO to mux offset mapping that is needed for dynamic muxing
669	* of GPIO pins for off-idle.
670	*/
671	static void __init omap_mux_init_list(struct omap_mux *superset)
672	{
673	while (superset->reg_offset != OMAP_MUX_TERMINATOR) {
674	struct omap_mux *entry;
675
b72c7d54 RL	676	#ifdef CONFIG_OMAP_MUX
b72c7d54 RL	677	if (!superset->muxnames \|\| !superset->muxnames[0]) {
15ac7afe TL	678	superset++;
	679	continue;
	680	}
b72c7d54 RL	681	#else
	682	/* Skip pins that are not muxed as GPIO by bootloader */
	683	if (!OMAP_MODE_GPIO(omap_mux_read(superset->reg_offset))) {
9ecef433 TL	684	superset++;
	685	continue;
	686	}
	687	#endif
	688
15ac7afe TL	689	entry = omap_mux_list_add(superset);
	690	if (!entry) {
	691	printk(KERN_ERR "mux: Could not add entry\n");
	692	return;
	693	}
	694	superset++;
	695	}
	696	}
	697
321cfc85 TL	698	#ifdef CONFIG_OMAP_MUX
	699
	700	static void omap_mux_init_package(struct omap_mux *superset,
	701	struct omap_mux *package_subset,
	702	struct omap_ball *package_balls)
	703	{
	704	if (package_subset)
	705	omap_mux_package_fixup(package_subset, superset);
	706	if (package_balls)
	707	omap_mux_package_init_balls(package_balls, superset);
	708	}
	709
	710	static void omap_mux_init_signals(struct omap_board_mux *board_mux)
	711	{
	712	omap_mux_set_cmdline_signals();
	713	omap_mux_write_array(board_mux);
	714	}
	715
	716	#else
	717
	718	static void omap_mux_init_package(struct omap_mux *superset,
	719	struct omap_mux *package_subset,
	720	struct omap_ball *package_balls)
	721	{
	722	}
	723
	724	static void omap_mux_init_signals(struct omap_board_mux *board_mux)
	725	{
	726	}
	727
	728	#endif
	729
15ac7afe TL	730	int __init omap_mux_init(u32 mux_pbase, u32 mux_size,
	731	struct omap_mux *superset,
	732	struct omap_mux *package_subset,
	733	struct omap_board_mux *board_mux,
	734	struct omap_ball *package_balls)
	735	{
	736	if (mux_base)
	737	return -EBUSY;
	738
4b715efc	739	mux_phys = mux_pbase;
15ac7afe TL	740	mux_base = ioremap(mux_pbase, mux_size);
	741	if (!mux_base) {
	742	printk(KERN_ERR "mux: Could not ioremap\n");
	743	return -ENODEV;
	744	}
	745
d5425be6 TL	746	if (cpu_is_omap24xx())
	747	omap_mux_flags = MUXABLE_GPIO_MODE3;
	748
321cfc85	749	omap_mux_init_package(superset, package_subset, package_balls);
15ac7afe	750	omap_mux_init_list(superset);
321cfc85	751	omap_mux_init_signals(board_mux);
2cb0c54f	752
15ac7afe TL	753	return 0;
	754	}
	755