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Commit b9772a22 authored by David Brownell's avatar David Brownell Committed by Russell King
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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: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 3ac4fa99

arch/arm/plat-omap/gpio.c

+129 −1
Original line number Diff line number Diff line
@@ -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;

}
@@ -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