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Commit d0b543c7 authored by Rabin Vincent's avatar Rabin Vincent Committed by Linus Walleij
Browse files

plat-nomadik: add custom dbg_show for GPIO 



Signed-off-by: default avatarRabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent e493e06f

arch/arm/plat-nomadik/gpio.c

+92 −0
Original line number Diff line number Diff line
@@ -604,6 +604,97 @@ static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 
	return NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base) + offset;

}



#ifdef CONFIG_DEBUG_FS



#include <linux/seq_file.h>



static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)

{

	int mode;

	unsigned		i;

	unsigned		gpio = chip->base;

	int			is_out;

	struct nmk_gpio_chip *nmk_chip =

		container_of(chip, struct nmk_gpio_chip, chip);

	const char *modes[] = {

		[NMK_GPIO_ALT_GPIO]	= "gpio",

		[NMK_GPIO_ALT_A]	= "altA",

		[NMK_GPIO_ALT_B]	= "altB",

		[NMK_GPIO_ALT_C]	= "altC",

	};



	for (i = 0; i < chip->ngpio; i++, gpio++) {

		const char *label = gpiochip_is_requested(chip, i);

		bool pull;

		u32 bit = 1 << i;



		if (!label)

			continue;



		is_out = readl(nmk_chip->addr + NMK_GPIO_DIR) & bit;

		pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & bit);

		mode = nmk_gpio_get_mode(gpio);

		seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s %s",

			gpio, label,

			is_out ? "out" : "in ",

			chip->get

				? (chip->get(chip, i) ? "hi" : "lo")

				: "?  ",

			(mode < 0) ? "unknown" : modes[mode],

			pull ? "pull" : "none");



		if (!is_out) {

			int		irq = gpio_to_irq(gpio);

			struct irq_desc	*desc = irq_to_desc(irq);



			/* This races with request_irq(), set_irq_type(),

			 * and set_irq_wake() ... but those are "rare".

			 *

			 * More significantly, trigger type flags aren't

			 * currently maintained by genirq.

			 */

			if (irq >= 0 && desc->action) {

				char *trigger;



				switch (desc->status & IRQ_TYPE_SENSE_MASK) {

				case IRQ_TYPE_NONE:

					trigger = "(default)";

					break;

				case IRQ_TYPE_EDGE_FALLING:

					trigger = "edge-falling";

					break;

				case IRQ_TYPE_EDGE_RISING:

					trigger = "edge-rising";

					break;

				case IRQ_TYPE_EDGE_BOTH:

					trigger = "edge-both";

					break;

				case IRQ_TYPE_LEVEL_HIGH:

					trigger = "level-high";

					break;

				case IRQ_TYPE_LEVEL_LOW:

					trigger = "level-low";

					break;

				default:

					trigger = "?trigger?";

					break;

				}



				seq_printf(s, " irq-%d %s%s",

					irq, trigger,

					(desc->status & IRQ_WAKEUP)

						? " wakeup" : "");

			}

		}



		seq_printf(s, "\n");

	}

}



#else

#define nmk_gpio_dbg_show	NULL

#endif



/* This structure is replicated for each GPIO block allocated at probe time */

static struct gpio_chip nmk_gpio_template = {

	.direction_input	= nmk_gpio_make_input,
@@ -611,6 +702,7 @@ static struct gpio_chip nmk_gpio_template = { 
	.direction_output	= nmk_gpio_make_output,

	.set			= nmk_gpio_set_output,

	.to_irq			= nmk_gpio_to_irq,

	.dbg_show		= nmk_gpio_dbg_show,

	.can_sleep		= 0,

};