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ARM: OMAP: /sys/kernel/debug/omap_gpio 

Add some GPIO debug support:  /sys/kernel/debug/omap_gpio dumps the state
of all GPIOs that have been claimed, including basic IRQ info if relevant.
Tested on 24xx, 16xx.

Includes minor bugfixes:  recording IRQ trigger mode (this should probably
be a genirq patch), adding missing space to non-wakeup warning

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
David Brownell 2006-12-06 17:13:53 -08:00 committed by Russell King
parent 3ac4fa9929
commit b9772a220a
1 changed files with 129 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

130
arch/arm/plat-omap/gpio.c
View File

@ -535,6 +535,10 @@ static int gpio_irq_type(unsigned irq, unsigned type)
bank = get_gpio_bank(gpio);
spin_lock(&bank->lock);
retval = _set_gpio_triggering(bank, get_gpio_index(gpio), type);
if (retval == 0) {
irq_desc[irq].status &= ~IRQ_TYPE_SENSE_MASK;
irq_desc[irq].status |= type;
}
spin_unlock(&bank->lock);
return retval;
}
@ -701,7 +705,7 @@ static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
spin_lock(&bank->lock);
if (enable) {
if (bank->non_wakeup_gpios & (1 << gpio)) {
printk(KERN_ERR "Unable to enable wakeup on"
printk(KERN_ERR "Unable to enable wakeup on "
"non-wakeup GPIO%d\n",
(bank - gpio_bank) * 32 + gpio);
spin_unlock(&bank->lock);
@ -1359,3 +1363,127 @@ EXPORT_SYMBOL(omap_set_gpio_dataout);
EXPORT_SYMBOL(omap_get_gpio_datain);
arch_initcall(omap_gpio_sysinit);
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
#include <linux/seq_file.h>
static int gpio_is_input(struct gpio_bank *bank, int mask)
{
void __iomem *reg = bank->base;
switch (bank->method) {
case METHOD_MPUIO:
reg += OMAP_MPUIO_IO_CNTL;
break;
case METHOD_GPIO_1510:
reg += OMAP1510_GPIO_DIR_CONTROL;
break;
case METHOD_GPIO_1610:
reg += OMAP1610_GPIO_DIRECTION;
break;
case METHOD_GPIO_730:
reg += OMAP730_GPIO_DIR_CONTROL;
break;
case METHOD_GPIO_24XX:
reg += OMAP24XX_GPIO_OE;
break;
}
return __raw_readl(reg) & mask;
}
static int dbg_gpio_show(struct seq_file *s, void *unused)
{
unsigned i, j, gpio;
for (i = 0, gpio = 0; i < gpio_bank_count; i++) {
struct gpio_bank *bank = gpio_bank + i;
unsigned bankwidth = 16;
u32 mask = 1;
if (!cpu_is_omap24xx() && bank->method == METHOD_MPUIO)
gpio = OMAP_MPUIO(0);
else if (cpu_is_omap24xx() || cpu_is_omap730())
bankwidth = 32;
for (j = 0; j < bankwidth; j++, gpio++, mask <<= 1) {
unsigned irq, value, is_in, irqstat;
if (!(bank->reserved_map & mask))
continue;
irq = bank->virtual_irq_start + j;
value = omap_get_gpio_datain(gpio);
is_in = gpio_is_input(bank, mask);
if (!cpu_is_omap24xx() && bank->method == METHOD_MPUIO)
seq_printf(s, "MPUIO %2d: ", j);
else
seq_printf(s, "GPIO %3d: ", gpio);
seq_printf(s, "%s %s",
is_in ? "in " : "out",
value ? "hi" : "lo");
irqstat = irq_desc[irq].status;
if (is_in && ((bank->suspend_wakeup & mask)
|| irqstat & IRQ_TYPE_SENSE_MASK)) {
char *trigger = NULL;
switch (irqstat & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_EDGE_FALLING:
trigger = "falling";
break;
case IRQ_TYPE_EDGE_RISING:
trigger = "rising";
break;
case IRQ_TYPE_EDGE_BOTH:
trigger = "bothedge";
break;
case IRQ_TYPE_LEVEL_LOW:
trigger = "low";
break;
case IRQ_TYPE_LEVEL_HIGH:
trigger = "high";
break;
case IRQ_TYPE_NONE:
trigger = "(unspecified)";
break;
}
seq_printf(s, ", irq-%d %s%s",
irq, trigger,
(bank->suspend_wakeup & mask)
? " wakeup" : "");
}
seq_printf(s, "\n");
}
if (!cpu_is_omap24xx() && bank->method == METHOD_MPUIO) {
seq_printf(s, "\n");
gpio = 0;
}
}
return 0;
}
static int dbg_gpio_open(struct inode *inode, struct file *file)
{
return single_open(file, dbg_gpio_show, inode->u.generic_ip/*i_private*/);
}
static const struct file_operations debug_fops = {
.open = dbg_gpio_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init omap_gpio_debuginit(void)
{
(void) debugfs_create_file("omap_gpio", S_IRUGO, NULL, NULL, &debug_fops);
return 0;
}
late_initcall(omap_gpio_debuginit);
#endif