1 files changed, 65 insertions, 4 deletions

diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c
index 028e4f7a88be..f2236f0e101f 100644
--- a/arch/arm/mach-at91/gpio.c
+++ b/arch/arm/mach-at91/gpio.c
@@ -437,7 +437,68 @@ static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
 
 /*--------------------------------------------------------------------------*/
 
-/* This lock class tells lockdep that GPIO irqs are in a different
+#ifdef CONFIG_DEBUG_FS
+
+static int at91_gpio_show(struct seq_file *s, void *unused)
+{
+	int bank, j;
+
+	/* print heading */
+	seq_printf(s, "Pin\t");
+	for (bank = 0; bank < gpio_banks; bank++) {
+		seq_printf(s, "PIO%c\t", 'A' + bank);
+	};
+	seq_printf(s, "\n\n");
+
+	/* print pin status */
+	for (j = 0; j < 32; j++) {
+		seq_printf(s, "%i:\t", j);
+
+		for (bank = 0; bank < gpio_banks; bank++) {
+			unsigned	pin  = PIN_BASE + (32 * bank) + j;
+			void __iomem	*pio = pin_to_controller(pin);
+			unsigned	mask = pin_to_mask(pin);
+
+			if (__raw_readl(pio + PIO_PSR) & mask)
+				seq_printf(s, "GPIO:%s", __raw_readl(pio + PIO_PDSR) & mask ? "1" : "0");
+			else
+				seq_printf(s, "%s", __raw_readl(pio + PIO_ABSR) & mask ? "B" : "A");
+
+			seq_printf(s, "\t");
+		}
+
+		seq_printf(s, "\n");
+	}
+
+	return 0;
+}
+
+static int at91_gpio_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, at91_gpio_show, NULL);
+}
+
+static const struct file_operations at91_gpio_operations = {
+	.open		= at91_gpio_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static int __init at91_gpio_debugfs_init(void)
+{
+	/* /sys/kernel/debug/at91_gpio */
+	(void) debugfs_create_file("at91_gpio", S_IFREG | S_IRUGO, NULL, NULL, &at91_gpio_operations);
+	return 0;
+}
+postcore_initcall(at91_gpio_debugfs_init);
+
+#endif
+
+/*--------------------------------------------------------------------------*/
+
+/*
+ * This lock class tells lockdep that GPIO irqs are in a different
  * category than their parents, so it won't report false recursion.
  */
 static struct lock_class_key gpio_lock_class;
@@ -456,9 +517,6 @@ void __init at91_gpio_irq_setup(void)
 		unsigned	id = this->bank->id;
 		unsigned	i;
 
-		/* enable PIO controller's clock */
-		clk_enable(this->bank->clock);
-
 		__raw_writel(~0, this->regbase + PIO_IDR);
 
 		for (i = 0, pin = this->chip.base; i < 32; i++, pin++) {
@@ -589,6 +647,9 @@ void __init at91_gpio_init(struct at91_gpio_bank *data, int nr_banks)
 		at91_gpio->regbase = at91_gpio->bank->offset +
 			(void __iomem *)AT91_VA_BASE_SYS;
 
+		/* enable PIO controller's clock */
+		clk_enable(at91_gpio->bank->clock);
+
 		/* AT91SAM9263_ID_PIOCDE groups PIOC, PIOD, PIOE */
 		if (last && last->bank->id == at91_gpio->bank->id)
 			last->next = at91_gpio;