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omap: mux: Add debugfs support for new mux code
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Add debugfs support for new mux code

Signed-off-by: Tony Lindgren <tony@atomide.com>
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Tony Lindgren committed Dec 12, 2009
1 parent ca5742b commit 4b715ef
Showing 1 changed file with 227 additions and 0 deletions.
227 changes: 227 additions & 0 deletions arch/arm/mach-omap2/mux.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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>

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

}

omap_mux_dbg_init();

return 0;
}
late_initcall(omap_mux_late_init);
Expand Down Expand Up @@ -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");
Expand Down

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