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Commit 20118ff9 authored by Andrew Victor's avatar Andrew Victor Committed by Russell King
Browse files

[ARM] 4603/1: KS8695: debugfs interface to view pin state 



This patch adds a debug interface (if CONFIG_DEBUG_FS is selected) to
display the basic configuration and current state of the GPIO pins on
the Kendin/Micrel KS8695 processor.

Signed-off-by: default avatarAndrew Victor <andrew@sanpeople.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 7d77ce8f

arch/arm/mach-ks8695/gpio.c

+83 −0
Original line number Diff line number Diff line
@@ -20,6 +20,8 @@ 
#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/init.h>

#include <linux/debugfs.h>

#include <linux/seq_file.h>

#include <linux/module.h>



#include <asm/io.h>
@@ -216,3 +218,84 @@ int irq_to_gpio(unsigned int irq) 
	return (irq - KS8695_IRQ_EXTERN0);

}

EXPORT_SYMBOL(irq_to_gpio);





/* .... Debug interface ..................................................... */



#ifdef CONFIG_DEBUG_FS



static int ks8695_gpio_show(struct seq_file *s, void *unused)

{

	unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };

	unsigned int intmask[] = { IOPC_IOEINT0TM, IOPC_IOEINT1TM, IOPC_IOEINT2TM, IOPC_IOEINT3TM };

	unsigned long mode, ctrl, data;

	int i;



	mode = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);

	ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);

	data = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);



	seq_printf(s, "Pin\tI/O\tFunction\tState\n\n");



	for (i = KS8695_GPIO_0; i <= KS8695_GPIO_15 ; i++) {

		seq_printf(s, "%i:\t", i);



		seq_printf(s, "%s\t", (mode & IOPM_(i)) ? "Output" : "Input");



		if (i <= KS8695_GPIO_3) {

			if (ctrl & enable[i]) {

				seq_printf(s, "EXT%i ", i);



				switch ((ctrl & intmask[i]) >> (4 * i)) {

					case IOPC_TM_LOW:

						seq_printf(s, "(Low)");		break;

					case IOPC_TM_HIGH:

						seq_printf(s, "(High)");	break;

					case IOPC_TM_RISING:

						seq_printf(s, "(Rising)");	break;

					case IOPC_TM_FALLING:

						seq_printf(s, "(Falling)");	break;

					case IOPC_TM_EDGE:

						seq_printf(s, "(Edges)");	break;

				}

			}

			else

				seq_printf(s, "GPIO\t");

		}

		else if (i <= KS8695_GPIO_5) {

			if (ctrl & enable[i])

				seq_printf(s, "TOUT%i\t", i - KS8695_GPIO_4);

			else

				seq_printf(s, "GPIO\t");

		}

		else

			seq_printf(s, "GPIO\t");



		seq_printf(s, "\t");



		seq_printf(s, "%i\n", (data & IOPD_(i)) ? 1 : 0);

	}

	return 0;

}



static int ks8695_gpio_open(struct inode *inode, struct file *file)

{

	return single_open(file, ks8695_gpio_show, NULL);

}



static const struct file_operations ks8695_gpio_operations = {

	.open		= ks8695_gpio_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static int __init ks8695_gpio_debugfs_init(void)

{

	/* /sys/kernel/debug/ks8695_gpio */

	(void) debugfs_create_file("ks8695_gpio", S_IFREG | S_IRUGO, NULL, NULL, &ks8695_gpio_operations);

	return 0;

}

postcore_initcall(ks8695_gpio_debugfs_init);



#endif

include/asm-arm/arch-ks8695/regs-gpio.h

+2 −0
Original line number Diff line number Diff line
@@ -49,5 +49,7 @@ 
#define IOPC_TM_FALLING		(4)		/* Falling Edge Detection */

#define IOPC_TM_EDGE		(6)		/* Both Edge Detection */



/* Port Data Register */

#define IOPD_(x)		(1 << (x))	/* Signal Level of GPIO Pin x */



#endif