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Commit 8d007488 authored by Simon Guinot's avatar Simon Guinot Committed by Jason Cooper
Browse files

ARM: Orion: add dbg_show function to gpio-orion driver 



This patch adds a dedicated dbg_show function to the gpio-mvebu driver.
In addition to the generic gpiolib informations, this function displays
informations related with the specific Marvell registers (blink enable,
data in polarity, interrupt masks and cause).

Signed-off-by: default avatarSimon Guinot <simon.guinot@sequanux.org>
Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent 8bb96604

arch/arm/plat-orion/gpio.c

+59 −0
Original line number Diff line number Diff line
@@ -439,6 +439,64 @@ static void gpio_irq_handler(unsigned irq, struct irq_desc *desc) 
	}

}



#ifdef CONFIG_DEBUG_FS

#include <linux/seq_file.h>



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

{

	struct orion_gpio_chip *ochip =

		container_of(chip, struct orion_gpio_chip, chip);

	u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;

	int i;



	out	= readl_relaxed(GPIO_OUT(ochip));

	io_conf	= readl_relaxed(GPIO_IO_CONF(ochip));

	blink	= readl_relaxed(GPIO_BLINK_EN(ochip));

	in_pol	= readl_relaxed(GPIO_IN_POL(ochip));

	data_in	= readl_relaxed(GPIO_DATA_IN(ochip));

	cause	= readl_relaxed(GPIO_EDGE_CAUSE(ochip));

	edg_msk	= readl_relaxed(GPIO_EDGE_MASK(ochip));

	lvl_msk	= readl_relaxed(GPIO_LEVEL_MASK(ochip));



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

		const char *label;

		u32 msk;

		bool is_out;



		label = gpiochip_is_requested(chip, i);

		if (!label)

			continue;



		msk = 1 << i;

		is_out = !(io_conf & msk);



		seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);



		if (is_out) {

			seq_printf(s, " out %s %s\n",

				   out & msk ? "hi" : "lo",

				   blink & msk ? "(blink )" : "");

			continue;

		}



		seq_printf(s, " in  %s (act %s) - IRQ",

			   (data_in ^ in_pol) & msk  ? "hi" : "lo",

			   in_pol & msk ? "lo" : "hi");

		if (!((edg_msk | lvl_msk) & msk)) {

			seq_printf(s, " disabled\n");

			continue;

		}

		if (edg_msk & msk)

			seq_printf(s, " edge ");

		if (lvl_msk & msk)

			seq_printf(s, " level");

		seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear  ");

	}

}

#else

#define orion_gpio_dbg_show NULL

#endif



void __init orion_gpio_init(struct device_node *np,

			    int gpio_base, int ngpio,

			    void __iomem *base, int mask_offset,
@@ -471,6 +529,7 @@ void __init orion_gpio_init(struct device_node *np, 
#ifdef CONFIG_OF

	ochip->chip.of_node = np;

#endif

	ochip->chip.dbg_show = orion_gpio_dbg_show;



	spin_lock_init(&ochip->lock);

	ochip->base = (void __iomem *)base;