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Commit 4b715efc authored by Tony Lindgren's avatar Tony Lindgren
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omap: mux: Add debugfs support for new mux code 



Add debugfs support for new mux code

Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent ca5742bd

arch/arm/mach-omap2/mux.c

+227 −0
Original line number Diff line number Diff line
@@ -28,6 +28,10 @@ 
#include <linux/io.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>
@@ -44,6 +48,7 @@ struct omap_mux_entry { 
	struct list_head	node;

};



static unsigned long mux_phys;

static void __iomem *mux_base;



static inline u16 omap_mux_read(u16 reg)
@@ -807,6 +812,225 @@ int __init omap_mux_init_signal(char *muxname, int val) 
	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[14];

	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;



		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;
@@ -843,6 +1067,8 @@ static int __init omap_mux_late_init(void) 


	}



	omap_mux_dbg_init();



	return 0;

}

late_initcall(omap_mux_late_init);
@@ -1107,6 +1333,7 @@ int __init omap_mux_init(u32 mux_pbase, u32 mux_size, 
	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");